diff options
Diffstat (limited to 'drivers/target/target_core_transport.c')
| -rw-r--r-- | drivers/target/target_core_transport.c | 6570 |
1 files changed, 1687 insertions, 4883 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 236e22d8cfa..7fa62fc93e0 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -3,10 +3,7 @@ * * This file contains the Generic Target Engine Core. * - * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc. - * Copyright (c) 2005, 2006, 2007 SBE, Inc. - * Copyright (c) 2007-2010 Rising Tide Systems - * Copyright (c) 2008-2010 Linux-iSCSI.org + * (c) Copyright 2002-2013 Datera, Inc. * * Nicholas A. Bellinger <nab@kernel.org> * @@ -26,371 +23,178 @@ * ******************************************************************************/ -#include <linux/version.h> #include <linux/net.h> #include <linux/delay.h> #include <linux/string.h> #include <linux/timer.h> #include <linux/slab.h> -#include <linux/blkdev.h> #include <linux/spinlock.h> -#include <linux/smp_lock.h> #include <linux/kthread.h> #include <linux/in.h> #include <linux/cdrom.h> +#include <linux/module.h> +#include <linux/ratelimit.h> #include <asm/unaligned.h> #include <net/sock.h> #include <net/tcp.h> #include <scsi/scsi.h> #include <scsi/scsi_cmnd.h> -#include <scsi/libsas.h> /* For TASK_ATTR_* */ +#include <scsi/scsi_tcq.h> #include <target/target_core_base.h> -#include <target/target_core_device.h> -#include <target/target_core_tmr.h> -#include <target/target_core_tpg.h> -#include <target/target_core_transport.h> -#include <target/target_core_fabric_ops.h> +#include <target/target_core_backend.h> +#include <target/target_core_fabric.h> #include <target/target_core_configfs.h> +#include "target_core_internal.h" #include "target_core_alua.h" -#include "target_core_hba.h" #include "target_core_pr.h" -#include "target_core_scdb.h" #include "target_core_ua.h" -/* #define DEBUG_CDB_HANDLER */ -#ifdef DEBUG_CDB_HANDLER -#define DEBUG_CDB_H(x...) printk(KERN_INFO x) -#else -#define DEBUG_CDB_H(x...) -#endif - -/* #define DEBUG_CMD_MAP */ -#ifdef DEBUG_CMD_MAP -#define DEBUG_CMD_M(x...) printk(KERN_INFO x) -#else -#define DEBUG_CMD_M(x...) -#endif - -/* #define DEBUG_MEM_ALLOC */ -#ifdef DEBUG_MEM_ALLOC -#define DEBUG_MEM(x...) printk(KERN_INFO x) -#else -#define DEBUG_MEM(x...) -#endif - -/* #define DEBUG_MEM2_ALLOC */ -#ifdef DEBUG_MEM2_ALLOC -#define DEBUG_MEM2(x...) printk(KERN_INFO x) -#else -#define DEBUG_MEM2(x...) -#endif - -/* #define DEBUG_SG_CALC */ -#ifdef DEBUG_SG_CALC -#define DEBUG_SC(x...) printk(KERN_INFO x) -#else -#define DEBUG_SC(x...) -#endif - -/* #define DEBUG_SE_OBJ */ -#ifdef DEBUG_SE_OBJ -#define DEBUG_SO(x...) printk(KERN_INFO x) -#else -#define DEBUG_SO(x...) -#endif - -/* #define DEBUG_CMD_VOL */ -#ifdef DEBUG_CMD_VOL -#define DEBUG_VOL(x...) printk(KERN_INFO x) -#else -#define DEBUG_VOL(x...) -#endif - -/* #define DEBUG_CMD_STOP */ -#ifdef DEBUG_CMD_STOP -#define DEBUG_CS(x...) printk(KERN_INFO x) -#else -#define DEBUG_CS(x...) -#endif - -/* #define DEBUG_PASSTHROUGH */ -#ifdef DEBUG_PASSTHROUGH -#define DEBUG_PT(x...) printk(KERN_INFO x) -#else -#define DEBUG_PT(x...) -#endif - -/* #define DEBUG_TASK_STOP */ -#ifdef DEBUG_TASK_STOP -#define DEBUG_TS(x...) printk(KERN_INFO x) -#else -#define DEBUG_TS(x...) -#endif - -/* #define DEBUG_TRANSPORT_STOP */ -#ifdef DEBUG_TRANSPORT_STOP -#define DEBUG_TRANSPORT_S(x...) printk(KERN_INFO x) -#else -#define DEBUG_TRANSPORT_S(x...) -#endif - -/* #define DEBUG_TASK_FAILURE */ -#ifdef DEBUG_TASK_FAILURE -#define DEBUG_TF(x...) printk(KERN_INFO x) -#else -#define DEBUG_TF(x...) -#endif - -/* #define DEBUG_DEV_OFFLINE */ -#ifdef DEBUG_DEV_OFFLINE -#define DEBUG_DO(x...) printk(KERN_INFO x) -#else -#define DEBUG_DO(x...) -#endif - -/* #define DEBUG_TASK_STATE */ -#ifdef DEBUG_TASK_STATE -#define DEBUG_TSTATE(x...) printk(KERN_INFO x) -#else -#define DEBUG_TSTATE(x...) -#endif - -/* #define DEBUG_STATUS_THR */ -#ifdef DEBUG_STATUS_THR -#define DEBUG_ST(x...) printk(KERN_INFO x) -#else -#define DEBUG_ST(x...) -#endif - -/* #define DEBUG_TASK_TIMEOUT */ -#ifdef DEBUG_TASK_TIMEOUT -#define DEBUG_TT(x...) printk(KERN_INFO x) -#else -#define DEBUG_TT(x...) -#endif - -/* #define DEBUG_GENERIC_REQUEST_FAILURE */ -#ifdef DEBUG_GENERIC_REQUEST_FAILURE -#define DEBUG_GRF(x...) printk(KERN_INFO x) -#else -#define DEBUG_GRF(x...) -#endif - -/* #define DEBUG_SAM_TASK_ATTRS */ -#ifdef DEBUG_SAM_TASK_ATTRS -#define DEBUG_STA(x...) printk(KERN_INFO x) -#else -#define DEBUG_STA(x...) -#endif - -struct se_global *se_global; - -static struct kmem_cache *se_cmd_cache; +#define CREATE_TRACE_POINTS +#include <trace/events/target.h> + +static struct workqueue_struct *target_completion_wq; static struct kmem_cache *se_sess_cache; -struct kmem_cache *se_tmr_req_cache; struct kmem_cache *se_ua_cache; -struct kmem_cache *se_mem_cache; struct kmem_cache *t10_pr_reg_cache; struct kmem_cache *t10_alua_lu_gp_cache; struct kmem_cache *t10_alua_lu_gp_mem_cache; struct kmem_cache *t10_alua_tg_pt_gp_cache; struct kmem_cache *t10_alua_tg_pt_gp_mem_cache; +struct kmem_cache *t10_alua_lba_map_cache; +struct kmem_cache *t10_alua_lba_map_mem_cache; -/* Used for transport_dev_get_map_*() */ -typedef int (*map_func_t)(struct se_task *, u32); - -static int transport_generic_write_pending(struct se_cmd *); -static int transport_processing_thread(void *); -static int __transport_execute_tasks(struct se_device *dev); static void transport_complete_task_attr(struct se_cmd *cmd); -static void transport_direct_request_timeout(struct se_cmd *cmd); -static void transport_free_dev_tasks(struct se_cmd *cmd); -static u32 transport_generic_get_cdb_count(struct se_cmd *cmd, - unsigned long long starting_lba, u32 sectors, - enum dma_data_direction data_direction, - struct list_head *mem_list, int set_counts); -static int transport_generic_get_mem(struct se_cmd *cmd, u32 length, - u32 dma_size); -static int transport_generic_remove(struct se_cmd *cmd, - int release_to_pool, int session_reinstatement); -static int transport_get_sectors(struct se_cmd *cmd); -static struct list_head *transport_init_se_mem_list(void); -static int transport_map_sg_to_mem(struct se_cmd *cmd, - struct list_head *se_mem_list, void *in_mem, - u32 *se_mem_cnt); -static void transport_memcpy_se_mem_read_contig(struct se_cmd *cmd, - unsigned char *dst, struct list_head *se_mem_list); -static void transport_release_fe_cmd(struct se_cmd *cmd); -static void transport_remove_cmd_from_queue(struct se_cmd *cmd, - struct se_queue_obj *qobj); -static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq); -static void transport_stop_all_task_timers(struct se_cmd *cmd); - -int transport_emulate_control_cdb(struct se_task *task); - -int init_se_global(void) -{ - struct se_global *global; +static void transport_handle_queue_full(struct se_cmd *cmd, + struct se_device *dev); +static int transport_put_cmd(struct se_cmd *cmd); +static void target_complete_ok_work(struct work_struct *work); - global = kzalloc(sizeof(struct se_global), GFP_KERNEL); - if (!(global)) { - printk(KERN_ERR "Unable to allocate memory for struct se_global\n"); - return -1; - } - - INIT_LIST_HEAD(&global->g_lu_gps_list); - INIT_LIST_HEAD(&global->g_se_tpg_list); - INIT_LIST_HEAD(&global->g_hba_list); - INIT_LIST_HEAD(&global->g_se_dev_list); - spin_lock_init(&global->g_device_lock); - spin_lock_init(&global->hba_lock); - spin_lock_init(&global->se_tpg_lock); - spin_lock_init(&global->lu_gps_lock); - spin_lock_init(&global->plugin_class_lock); - - se_cmd_cache = kmem_cache_create("se_cmd_cache", - sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL); - if (!(se_cmd_cache)) { - printk(KERN_ERR "kmem_cache_create for struct se_cmd failed\n"); - goto out; - } - se_tmr_req_cache = kmem_cache_create("se_tmr_cache", - sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req), - 0, NULL); - if (!(se_tmr_req_cache)) { - printk(KERN_ERR "kmem_cache_create() for struct se_tmr_req" - " failed\n"); - goto out; - } +int init_se_kmem_caches(void) +{ se_sess_cache = kmem_cache_create("se_sess_cache", sizeof(struct se_session), __alignof__(struct se_session), 0, NULL); - if (!(se_sess_cache)) { - printk(KERN_ERR "kmem_cache_create() for struct se_session" + if (!se_sess_cache) { + pr_err("kmem_cache_create() for struct se_session" " failed\n"); goto out; } se_ua_cache = kmem_cache_create("se_ua_cache", sizeof(struct se_ua), __alignof__(struct se_ua), 0, NULL); - if (!(se_ua_cache)) { - printk(KERN_ERR "kmem_cache_create() for struct se_ua failed\n"); - goto out; - } - se_mem_cache = kmem_cache_create("se_mem_cache", - sizeof(struct se_mem), __alignof__(struct se_mem), 0, NULL); - if (!(se_mem_cache)) { - printk(KERN_ERR "kmem_cache_create() for struct se_mem failed\n"); - goto out; + if (!se_ua_cache) { + pr_err("kmem_cache_create() for struct se_ua failed\n"); + goto out_free_sess_cache; } t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", sizeof(struct t10_pr_registration), __alignof__(struct t10_pr_registration), 0, NULL); - if (!(t10_pr_reg_cache)) { - printk(KERN_ERR "kmem_cache_create() for struct t10_pr_registration" + if (!t10_pr_reg_cache) { + pr_err("kmem_cache_create() for struct t10_pr_registration" " failed\n"); - goto out; + goto out_free_ua_cache; } t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), 0, NULL); - if (!(t10_alua_lu_gp_cache)) { - printk(KERN_ERR "kmem_cache_create() for t10_alua_lu_gp_cache" + if (!t10_alua_lu_gp_cache) { + pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" " failed\n"); - goto out; + goto out_free_pr_reg_cache; } t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", sizeof(struct t10_alua_lu_gp_member), __alignof__(struct t10_alua_lu_gp_member), 0, NULL); - if (!(t10_alua_lu_gp_mem_cache)) { - printk(KERN_ERR "kmem_cache_create() for t10_alua_lu_gp_mem_" + if (!t10_alua_lu_gp_mem_cache) { + pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" "cache failed\n"); - goto out; + goto out_free_lu_gp_cache; } t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", sizeof(struct t10_alua_tg_pt_gp), __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); - if (!(t10_alua_tg_pt_gp_cache)) { - printk(KERN_ERR "kmem_cache_create() for t10_alua_tg_pt_gp_" + if (!t10_alua_tg_pt_gp_cache) { + pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" "cache failed\n"); - goto out; + goto out_free_lu_gp_mem_cache; } t10_alua_tg_pt_gp_mem_cache = kmem_cache_create( "t10_alua_tg_pt_gp_mem_cache", sizeof(struct t10_alua_tg_pt_gp_member), __alignof__(struct t10_alua_tg_pt_gp_member), 0, NULL); - if (!(t10_alua_tg_pt_gp_mem_cache)) { - printk(KERN_ERR "kmem_cache_create() for t10_alua_tg_pt_gp_" + if (!t10_alua_tg_pt_gp_mem_cache) { + pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" "mem_t failed\n"); - goto out; + goto out_free_tg_pt_gp_cache; + } + t10_alua_lba_map_cache = kmem_cache_create( + "t10_alua_lba_map_cache", + sizeof(struct t10_alua_lba_map), + __alignof__(struct t10_alua_lba_map), 0, NULL); + if (!t10_alua_lba_map_cache) { + pr_err("kmem_cache_create() for t10_alua_lba_map_" + "cache failed\n"); + goto out_free_tg_pt_gp_mem_cache; + } + t10_alua_lba_map_mem_cache = kmem_cache_create( + "t10_alua_lba_map_mem_cache", + sizeof(struct t10_alua_lba_map_member), + __alignof__(struct t10_alua_lba_map_member), 0, NULL); + if (!t10_alua_lba_map_mem_cache) { + pr_err("kmem_cache_create() for t10_alua_lba_map_mem_" + "cache failed\n"); + goto out_free_lba_map_cache; } - se_global = global; + target_completion_wq = alloc_workqueue("target_completion", + WQ_MEM_RECLAIM, 0); + if (!target_completion_wq) + goto out_free_lba_map_mem_cache; return 0; + +out_free_lba_map_mem_cache: + kmem_cache_destroy(t10_alua_lba_map_mem_cache); +out_free_lba_map_cache: + kmem_cache_destroy(t10_alua_lba_map_cache); +out_free_tg_pt_gp_mem_cache: + kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); +out_free_tg_pt_gp_cache: + kmem_cache_destroy(t10_alua_tg_pt_gp_cache); +out_free_lu_gp_mem_cache: + kmem_cache_destroy(t10_alua_lu_gp_mem_cache); +out_free_lu_gp_cache: + kmem_cache_destroy(t10_alua_lu_gp_cache); +out_free_pr_reg_cache: + kmem_cache_destroy(t10_pr_reg_cache); +out_free_ua_cache: + kmem_cache_destroy(se_ua_cache); +out_free_sess_cache: + kmem_cache_destroy(se_sess_cache); out: - if (se_cmd_cache) - kmem_cache_destroy(se_cmd_cache); - if (se_tmr_req_cache) - kmem_cache_destroy(se_tmr_req_cache); - if (se_sess_cache) - kmem_cache_destroy(se_sess_cache); - if (se_ua_cache) - kmem_cache_destroy(se_ua_cache); - if (se_mem_cache) - kmem_cache_destroy(se_mem_cache); - if (t10_pr_reg_cache) - kmem_cache_destroy(t10_pr_reg_cache); - if (t10_alua_lu_gp_cache) - kmem_cache_destroy(t10_alua_lu_gp_cache); - if (t10_alua_lu_gp_mem_cache) - kmem_cache_destroy(t10_alua_lu_gp_mem_cache); - if (t10_alua_tg_pt_gp_cache) - kmem_cache_destroy(t10_alua_tg_pt_gp_cache); - if (t10_alua_tg_pt_gp_mem_cache) - kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); - kfree(global); - return -1; + return -ENOMEM; } -void release_se_global(void) +void release_se_kmem_caches(void) { - struct se_global *global; - - global = se_global; - if (!(global)) - return; - - kmem_cache_destroy(se_cmd_cache); - kmem_cache_destroy(se_tmr_req_cache); + destroy_workqueue(target_completion_wq); kmem_cache_destroy(se_sess_cache); kmem_cache_destroy(se_ua_cache); - kmem_cache_destroy(se_mem_cache); kmem_cache_destroy(t10_pr_reg_cache); kmem_cache_destroy(t10_alua_lu_gp_cache); kmem_cache_destroy(t10_alua_lu_gp_mem_cache); kmem_cache_destroy(t10_alua_tg_pt_gp_cache); kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); - kfree(global); - - se_global = NULL; + kmem_cache_destroy(t10_alua_lba_map_cache); + kmem_cache_destroy(t10_alua_lba_map_mem_cache); } -/* SCSI statistics table index */ -static struct scsi_index_table scsi_index_table; - -/* - * Initialize the index table for allocating unique row indexes to various mib - * tables. - */ -void init_scsi_index_table(void) -{ - memset(&scsi_index_table, 0, sizeof(struct scsi_index_table)); - spin_lock_init(&scsi_index_table.lock); -} +/* This code ensures unique mib indexes are handed out. */ +static DEFINE_SPINLOCK(scsi_mib_index_lock); +static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; /* * Allocate a new row index for the entry type specified @@ -399,85 +203,114 @@ u32 scsi_get_new_index(scsi_index_t type) { u32 new_index; - if ((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)) { - printk(KERN_ERR "Invalid index type %d\n", type); - return -EINVAL; - } + BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); - spin_lock(&scsi_index_table.lock); - new_index = ++scsi_index_table.scsi_mib_index[type]; - if (new_index == 0) - new_index = ++scsi_index_table.scsi_mib_index[type]; - spin_unlock(&scsi_index_table.lock); + spin_lock(&scsi_mib_index_lock); + new_index = ++scsi_mib_index[type]; + spin_unlock(&scsi_mib_index_lock); return new_index; } -void transport_init_queue_obj(struct se_queue_obj *qobj) -{ - atomic_set(&qobj->queue_cnt, 0); - INIT_LIST_HEAD(&qobj->qobj_list); - init_waitqueue_head(&qobj->thread_wq); - spin_lock_init(&qobj->cmd_queue_lock); -} -EXPORT_SYMBOL(transport_init_queue_obj); - -static int transport_subsystem_reqmods(void) +void transport_subsystem_check_init(void) { int ret; + static int sub_api_initialized; + + if (sub_api_initialized) + return; ret = request_module("target_core_iblock"); if (ret != 0) - printk(KERN_ERR "Unable to load target_core_iblock\n"); + pr_err("Unable to load target_core_iblock\n"); ret = request_module("target_core_file"); if (ret != 0) - printk(KERN_ERR "Unable to load target_core_file\n"); + pr_err("Unable to load target_core_file\n"); ret = request_module("target_core_pscsi"); if (ret != 0) - printk(KERN_ERR "Unable to load target_core_pscsi\n"); + pr_err("Unable to load target_core_pscsi\n"); - ret = request_module("target_core_stgt"); - if (ret != 0) - printk(KERN_ERR "Unable to load target_core_stgt\n"); + sub_api_initialized = 1; +} - return 0; +struct se_session *transport_init_session(enum target_prot_op sup_prot_ops) +{ + struct se_session *se_sess; + + se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); + if (!se_sess) { + pr_err("Unable to allocate struct se_session from" + " se_sess_cache\n"); + return ERR_PTR(-ENOMEM); + } + INIT_LIST_HEAD(&se_sess->sess_list); + INIT_LIST_HEAD(&se_sess->sess_acl_list); + INIT_LIST_HEAD(&se_sess->sess_cmd_list); + INIT_LIST_HEAD(&se_sess->sess_wait_list); + spin_lock_init(&se_sess->sess_cmd_lock); + kref_init(&se_sess->sess_kref); + se_sess->sup_prot_ops = sup_prot_ops; + + return se_sess; } +EXPORT_SYMBOL(transport_init_session); -int transport_subsystem_check_init(void) +int transport_alloc_session_tags(struct se_session *se_sess, + unsigned int tag_num, unsigned int tag_size) { - if (se_global->g_sub_api_initialized) - return 0; - /* - * Request the loading of known TCM subsystem plugins.. - */ - if (transport_subsystem_reqmods() < 0) - return -1; + int rc; + + se_sess->sess_cmd_map = kzalloc(tag_num * tag_size, + GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); + if (!se_sess->sess_cmd_map) { + se_sess->sess_cmd_map = vzalloc(tag_num * tag_size); + if (!se_sess->sess_cmd_map) { + pr_err("Unable to allocate se_sess->sess_cmd_map\n"); + return -ENOMEM; + } + } + + rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num); + if (rc < 0) { + pr_err("Unable to init se_sess->sess_tag_pool," + " tag_num: %u\n", tag_num); + if (is_vmalloc_addr(se_sess->sess_cmd_map)) + vfree(se_sess->sess_cmd_map); + else + kfree(se_sess->sess_cmd_map); + se_sess->sess_cmd_map = NULL; + return -ENOMEM; + } - se_global->g_sub_api_initialized = 1; return 0; } +EXPORT_SYMBOL(transport_alloc_session_tags); -struct se_session *transport_init_session(void) +struct se_session *transport_init_session_tags(unsigned int tag_num, + unsigned int tag_size, + enum target_prot_op sup_prot_ops) { struct se_session *se_sess; + int rc; - se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); - if (!(se_sess)) { - printk(KERN_ERR "Unable to allocate struct se_session from" - " se_sess_cache\n"); + se_sess = transport_init_session(sup_prot_ops); + if (IS_ERR(se_sess)) + return se_sess; + + rc = transport_alloc_session_tags(se_sess, tag_num, tag_size); + if (rc < 0) { + transport_free_session(se_sess); return ERR_PTR(-ENOMEM); } - INIT_LIST_HEAD(&se_sess->sess_list); - INIT_LIST_HEAD(&se_sess->sess_acl_list); return se_sess; } -EXPORT_SYMBOL(transport_init_session); +EXPORT_SYMBOL(transport_init_session_tags); /* - * Called with spin_lock_bh(&struct se_portal_group->session_lock called. + * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called. */ void __transport_register_session( struct se_portal_group *se_tpg, @@ -500,12 +333,14 @@ void __transport_register_session( * If the fabric module supports an ISID based TransportID, * save this value in binary from the fabric I_T Nexus now. */ - if (TPG_TFO(se_tpg)->sess_get_initiator_sid != NULL) { + if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { memset(&buf[0], 0, PR_REG_ISID_LEN); - TPG_TFO(se_tpg)->sess_get_initiator_sid(se_sess, + se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &buf[0], PR_REG_ISID_LEN); se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); } + kref_get(&se_nacl->acl_kref); + spin_lock_irq(&se_nacl->nacl_sess_lock); /* * The se_nacl->nacl_sess pointer will be set to the @@ -519,8 +354,8 @@ void __transport_register_session( } list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); - printk(KERN_INFO "TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", - TPG_TFO(se_tpg)->get_fabric_name(), se_sess->fabric_sess_ptr); + pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", + se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); } EXPORT_SYMBOL(__transport_register_session); @@ -530,23 +365,66 @@ void transport_register_session( struct se_session *se_sess, void *fabric_sess_ptr) { - spin_lock_bh(&se_tpg->session_lock); + unsigned long flags; + + spin_lock_irqsave(&se_tpg->session_lock, flags); __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); - spin_unlock_bh(&se_tpg->session_lock); + spin_unlock_irqrestore(&se_tpg->session_lock, flags); } EXPORT_SYMBOL(transport_register_session); +static void target_release_session(struct kref *kref) +{ + struct se_session *se_sess = container_of(kref, + struct se_session, sess_kref); + struct se_portal_group *se_tpg = se_sess->se_tpg; + + se_tpg->se_tpg_tfo->close_session(se_sess); +} + +void target_get_session(struct se_session *se_sess) +{ + kref_get(&se_sess->sess_kref); +} +EXPORT_SYMBOL(target_get_session); + +void target_put_session(struct se_session *se_sess) +{ + struct se_portal_group *tpg = se_sess->se_tpg; + + if (tpg->se_tpg_tfo->put_session != NULL) { + tpg->se_tpg_tfo->put_session(se_sess); + return; + } + kref_put(&se_sess->sess_kref, target_release_session); +} +EXPORT_SYMBOL(target_put_session); + +static void target_complete_nacl(struct kref *kref) +{ + struct se_node_acl *nacl = container_of(kref, + struct se_node_acl, acl_kref); + + complete(&nacl->acl_free_comp); +} + +void target_put_nacl(struct se_node_acl *nacl) +{ + kref_put(&nacl->acl_kref, target_complete_nacl); +} + void transport_deregister_session_configfs(struct se_session *se_sess) { struct se_node_acl *se_nacl; - + unsigned long flags; /* * Used by struct se_node_acl's under ConfigFS to locate active struct se_session */ se_nacl = se_sess->se_node_acl; - if ((se_nacl)) { - spin_lock_irq(&se_nacl->nacl_sess_lock); - list_del(&se_sess->sess_acl_list); + if (se_nacl) { + spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); + if (se_nacl->acl_stop == 0) + list_del(&se_sess->sess_acl_list); /* * If the session list is empty, then clear the pointer. * Otherwise, set the struct se_session pointer from the tail @@ -559,13 +437,20 @@ void transport_deregister_session_configfs(struct se_session *se_sess) se_nacl->acl_sess_list.prev, struct se_session, sess_acl_list); } - spin_unlock_irq(&se_nacl->nacl_sess_lock); + spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); } } EXPORT_SYMBOL(transport_deregister_session_configfs); void transport_free_session(struct se_session *se_sess) { + if (se_sess->sess_cmd_map) { + percpu_ida_destroy(&se_sess->sess_tag_pool); + if (is_vmalloc_addr(se_sess->sess_cmd_map)) + vfree(se_sess->sess_cmd_map); + else + kfree(se_sess->sess_cmd_map); + } kmem_cache_free(se_sess_cache, se_sess); } EXPORT_SYMBOL(transport_free_session); @@ -573,650 +458,314 @@ EXPORT_SYMBOL(transport_free_session); void transport_deregister_session(struct se_session *se_sess) { struct se_portal_group *se_tpg = se_sess->se_tpg; + struct target_core_fabric_ops *se_tfo; struct se_node_acl *se_nacl; + unsigned long flags; + bool comp_nacl = true; - if (!(se_tpg)) { + if (!se_tpg) { transport_free_session(se_sess); return; } + se_tfo = se_tpg->se_tpg_tfo; - spin_lock_bh(&se_tpg->session_lock); + spin_lock_irqsave(&se_tpg->session_lock, flags); list_del(&se_sess->sess_list); se_sess->se_tpg = NULL; se_sess->fabric_sess_ptr = NULL; - spin_unlock_bh(&se_tpg->session_lock); + spin_unlock_irqrestore(&se_tpg->session_lock, flags); /* * Determine if we need to do extra work for this initiator node's * struct se_node_acl if it had been previously dynamically generated. */ se_nacl = se_sess->se_node_acl; - if ((se_nacl)) { - spin_lock_bh(&se_tpg->acl_node_lock); - if (se_nacl->dynamic_node_acl) { - if (!(TPG_TFO(se_tpg)->tpg_check_demo_mode_cache( - se_tpg))) { - list_del(&se_nacl->acl_list); - se_tpg->num_node_acls--; - spin_unlock_bh(&se_tpg->acl_node_lock); - - core_tpg_wait_for_nacl_pr_ref(se_nacl); - core_free_device_list_for_node(se_nacl, se_tpg); - TPG_TFO(se_tpg)->tpg_release_fabric_acl(se_tpg, - se_nacl); - spin_lock_bh(&se_tpg->acl_node_lock); - } + + spin_lock_irqsave(&se_tpg->acl_node_lock, flags); + if (se_nacl && se_nacl->dynamic_node_acl) { + if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) { + list_del(&se_nacl->acl_list); + se_tpg->num_node_acls--; + spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); + core_tpg_wait_for_nacl_pr_ref(se_nacl); + core_free_device_list_for_node(se_nacl, se_tpg); + se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl); + + comp_nacl = false; + spin_lock_irqsave(&se_tpg->acl_node_lock, flags); } - spin_unlock_bh(&se_tpg->acl_node_lock); } + spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); - transport_free_session(se_sess); + pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", + se_tpg->se_tpg_tfo->get_fabric_name()); + /* + * If last kref is dropping now for an explicit NodeACL, awake sleeping + * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group + * removal context. + */ + if (se_nacl && comp_nacl) + target_put_nacl(se_nacl); - printk(KERN_INFO "TARGET_CORE[%s]: Deregistered fabric_sess\n", - TPG_TFO(se_tpg)->get_fabric_name()); + transport_free_session(se_sess); } EXPORT_SYMBOL(transport_deregister_session); /* - * Called with T_TASK(cmd)->t_state_lock held. + * Called with cmd->t_state_lock held. */ -static void transport_all_task_dev_remove_state(struct se_cmd *cmd) +static void target_remove_from_state_list(struct se_cmd *cmd) { - struct se_device *dev; - struct se_task *task; + struct se_device *dev = cmd->se_dev; unsigned long flags; - if (!T_TASK(cmd)) + if (!dev) return; - list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) { - dev = task->se_dev; - if (!(dev)) - continue; - - if (atomic_read(&task->task_active)) - continue; - - if (!(atomic_read(&task->task_state_active))) - continue; - - spin_lock_irqsave(&dev->execute_task_lock, flags); - list_del(&task->t_state_list); - DEBUG_TSTATE("Removed ITT: 0x%08x dev: %p task[%p]\n", - CMD_TFO(cmd)->tfo_get_task_tag(cmd), dev, task); - spin_unlock_irqrestore(&dev->execute_task_lock, flags); + if (cmd->transport_state & CMD_T_BUSY) + return; - atomic_set(&task->task_state_active, 0); - atomic_dec(&T_TASK(cmd)->t_task_cdbs_ex_left); + spin_lock_irqsave(&dev->execute_task_lock, flags); + if (cmd->state_active) { + list_del(&cmd->state_list); + cmd->state_active = false; } + spin_unlock_irqrestore(&dev->execute_task_lock, flags); } -/* transport_cmd_check_stop(): - * - * 'transport_off = 1' determines if t_transport_active should be cleared. - * 'transport_off = 2' determines if task_dev_state should be removed. - * - * A non-zero u8 t_state sets cmd->t_state. - * Returns 1 when command is stopped, else 0. - */ -static int transport_cmd_check_stop( - struct se_cmd *cmd, - int transport_off, - u8 t_state) +static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists, + bool write_pending) { unsigned long flags; - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - /* - * Determine if IOCTL context caller in requesting the stopping of this - * command for LUN shutdown purposes. - */ - if (atomic_read(&T_TASK(cmd)->transport_lun_stop)) { - DEBUG_CS("%s:%d atomic_read(&T_TASK(cmd)->transport_lun_stop)" - " == TRUE for ITT: 0x%08x\n", __func__, __LINE__, - CMD_TFO(cmd)->get_task_tag(cmd)); - - cmd->deferred_t_state = cmd->t_state; - cmd->t_state = TRANSPORT_DEFERRED_CMD; - atomic_set(&T_TASK(cmd)->t_transport_active, 0); - if (transport_off == 2) - transport_all_task_dev_remove_state(cmd); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - - complete(&T_TASK(cmd)->transport_lun_stop_comp); - return 1; + spin_lock_irqsave(&cmd->t_state_lock, flags); + if (write_pending) + cmd->t_state = TRANSPORT_WRITE_PENDING; + + if (remove_from_lists) { + target_remove_from_state_list(cmd); + + /* + * Clear struct se_cmd->se_lun before the handoff to FE. + */ + cmd->se_lun = NULL; } + /* * Determine if frontend context caller is requesting the stopping of - * this command for frontend excpections. + * this command for frontend exceptions. */ - if (atomic_read(&T_TASK(cmd)->t_transport_stop)) { - DEBUG_CS("%s:%d atomic_read(&T_TASK(cmd)->t_transport_stop) ==" - " TRUE for ITT: 0x%08x\n", __func__, __LINE__, - CMD_TFO(cmd)->get_task_tag(cmd)); + if (cmd->transport_state & CMD_T_STOP) { + pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", + __func__, __LINE__, + cmd->se_tfo->get_task_tag(cmd)); - cmd->deferred_t_state = cmd->t_state; - cmd->t_state = TRANSPORT_DEFERRED_CMD; - if (transport_off == 2) - transport_all_task_dev_remove_state(cmd); + spin_unlock_irqrestore(&cmd->t_state_lock, flags); - /* - * Clear struct se_cmd->se_lun before the transport_off == 2 handoff - * to FE. - */ - if (transport_off == 2) - cmd->se_lun = NULL; - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - - complete(&T_TASK(cmd)->t_transport_stop_comp); + complete_all(&cmd->t_transport_stop_comp); return 1; } - if (transport_off) { - atomic_set(&T_TASK(cmd)->t_transport_active, 0); - if (transport_off == 2) { - transport_all_task_dev_remove_state(cmd); - /* - * Clear struct se_cmd->se_lun before the transport_off == 2 - * handoff to fabric module. - */ - cmd->se_lun = NULL; - /* - * Some fabric modules like tcm_loop can release - * their internally allocated I/O refrence now and - * struct se_cmd now. - */ - if (CMD_TFO(cmd)->check_stop_free != NULL) { - spin_unlock_irqrestore( - &T_TASK(cmd)->t_state_lock, flags); - - CMD_TFO(cmd)->check_stop_free(cmd); - return 1; - } - } - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - return 0; - } else if (t_state) - cmd->t_state = t_state; - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); + cmd->transport_state &= ~CMD_T_ACTIVE; + if (remove_from_lists) { + /* + * Some fabric modules like tcm_loop can release + * their internally allocated I/O reference now and + * struct se_cmd now. + * + * Fabric modules are expected to return '1' here if the + * se_cmd being passed is released at this point, + * or zero if not being released. + */ + if (cmd->se_tfo->check_stop_free != NULL) { + spin_unlock_irqrestore(&cmd->t_state_lock, flags); + return cmd->se_tfo->check_stop_free(cmd); + } + } + spin_unlock_irqrestore(&cmd->t_state_lock, flags); return 0; } static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) { - return transport_cmd_check_stop(cmd, 2, 0); + return transport_cmd_check_stop(cmd, true, false); } static void transport_lun_remove_cmd(struct se_cmd *cmd) { - struct se_lun *lun = SE_LUN(cmd); - unsigned long flags; + struct se_lun *lun = cmd->se_lun; if (!lun) return; - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) { - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - goto check_lun; - } - atomic_set(&T_TASK(cmd)->transport_dev_active, 0); - transport_all_task_dev_remove_state(cmd); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - - transport_free_dev_tasks(cmd); - -check_lun: - spin_lock_irqsave(&lun->lun_cmd_lock, flags); - if (atomic_read(&T_TASK(cmd)->transport_lun_active)) { - list_del(&cmd->se_lun_list); - atomic_set(&T_TASK(cmd)->transport_lun_active, 0); -#if 0 - printk(KERN_INFO "Removed ITT: 0x%08x from LUN LIST[%d]\n" - CMD_TFO(cmd)->get_task_tag(cmd), lun->unpacked_lun); -#endif - } - spin_unlock_irqrestore(&lun->lun_cmd_lock, flags); + if (cmpxchg(&cmd->lun_ref_active, true, false)) + percpu_ref_put(&lun->lun_ref); } void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) { - transport_remove_cmd_from_queue(cmd, SE_DEV(cmd)->dev_queue_obj); - transport_lun_remove_cmd(cmd); - - if (transport_cmd_check_stop_to_fabric(cmd)) - return; + if (cmd->se_cmd_flags & SCF_SE_LUN_CMD) + transport_lun_remove_cmd(cmd); + /* + * Allow the fabric driver to unmap any resources before + * releasing the descriptor via TFO->release_cmd() + */ if (remove) - transport_generic_remove(cmd, 0, 0); -} - -void transport_cmd_finish_abort_tmr(struct se_cmd *cmd) -{ - transport_remove_cmd_from_queue(cmd, SE_DEV(cmd)->dev_queue_obj); + cmd->se_tfo->aborted_task(cmd); if (transport_cmd_check_stop_to_fabric(cmd)) return; - - transport_generic_remove(cmd, 0, 0); + if (remove) + transport_put_cmd(cmd); } -static int transport_add_cmd_to_queue( - struct se_cmd *cmd, - int t_state) +static void target_complete_failure_work(struct work_struct *work) { - struct se_device *dev = cmd->se_dev; - struct se_queue_obj *qobj = dev->dev_queue_obj; - struct se_queue_req *qr; - unsigned long flags; - - qr = kzalloc(sizeof(struct se_queue_req), GFP_ATOMIC); - if (!(qr)) { - printk(KERN_ERR "Unable to allocate memory for" - " struct se_queue_req\n"); - return -1; - } - INIT_LIST_HEAD(&qr->qr_list); - - qr->cmd = (void *)cmd; - qr->state = t_state; + struct se_cmd *cmd = container_of(work, struct se_cmd, work); - if (t_state) { - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - cmd->t_state = t_state; - atomic_set(&T_TASK(cmd)->t_transport_active, 1); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - } - - spin_lock_irqsave(&qobj->cmd_queue_lock, flags); - list_add_tail(&qr->qr_list, &qobj->qobj_list); - atomic_inc(&T_TASK(cmd)->t_transport_queue_active); - spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); - - atomic_inc(&qobj->queue_cnt); - wake_up_interruptible(&qobj->thread_wq); - return 0; + transport_generic_request_failure(cmd, + TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); } /* - * Called with struct se_queue_obj->cmd_queue_lock held. + * Used when asking transport to copy Sense Data from the underlying + * Linux/SCSI struct scsi_cmnd */ -static struct se_queue_req * -__transport_get_qr_from_queue(struct se_queue_obj *qobj) +static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd) { - struct se_cmd *cmd; - struct se_queue_req *qr = NULL; - - if (list_empty(&qobj->qobj_list)) - return NULL; - - list_for_each_entry(qr, &qobj->qobj_list, qr_list) - break; + struct se_device *dev = cmd->se_dev; - if (qr->cmd) { - cmd = (struct se_cmd *)qr->cmd; - atomic_dec(&T_TASK(cmd)->t_transport_queue_active); - } - list_del(&qr->qr_list); - atomic_dec(&qobj->queue_cnt); + WARN_ON(!cmd->se_lun); - return qr; -} - -static struct se_queue_req * -transport_get_qr_from_queue(struct se_queue_obj *qobj) -{ - struct se_cmd *cmd; - struct se_queue_req *qr; - unsigned long flags; - - spin_lock_irqsave(&qobj->cmd_queue_lock, flags); - if (list_empty(&qobj->qobj_list)) { - spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); + if (!dev) return NULL; - } - list_for_each_entry(qr, &qobj->qobj_list, qr_list) - break; + if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) + return NULL; - if (qr->cmd) { - cmd = (struct se_cmd *)qr->cmd; - atomic_dec(&T_TASK(cmd)->t_transport_queue_active); - } - list_del(&qr->qr_list); - atomic_dec(&qobj->queue_cnt); - spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); + cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; - return qr; + pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n", + dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status); + return cmd->sense_buffer; } -static void transport_remove_cmd_from_queue(struct se_cmd *cmd, - struct se_queue_obj *qobj) +void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) { - struct se_cmd *q_cmd; - struct se_queue_req *qr = NULL, *qr_p = NULL; + struct se_device *dev = cmd->se_dev; + int success = scsi_status == GOOD; unsigned long flags; - spin_lock_irqsave(&qobj->cmd_queue_lock, flags); - if (!(atomic_read(&T_TASK(cmd)->t_transport_queue_active))) { - spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); - return; - } - - list_for_each_entry_safe(qr, qr_p, &qobj->qobj_list, qr_list) { - q_cmd = (struct se_cmd *)qr->cmd; - if (q_cmd != cmd) - continue; - - atomic_dec(&T_TASK(q_cmd)->t_transport_queue_active); - atomic_dec(&qobj->queue_cnt); - list_del(&qr->qr_list); - kfree(qr); - } - spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); - - if (atomic_read(&T_TASK(cmd)->t_transport_queue_active)) { - printk(KERN_ERR "ITT: 0x%08x t_transport_queue_active: %d\n", - CMD_TFO(cmd)->get_task_tag(cmd), - atomic_read(&T_TASK(cmd)->t_transport_queue_active)); - } -} - -/* - * Completion function used by TCM subsystem plugins (such as FILEIO) - * for queueing up response from struct se_subsystem_api->do_task() - */ -void transport_complete_sync_cache(struct se_cmd *cmd, int good) -{ - struct se_task *task = list_entry(T_TASK(cmd)->t_task_list.next, - struct se_task, t_list); - - if (good) { - cmd->scsi_status = SAM_STAT_GOOD; - task->task_scsi_status = GOOD; - } else { - task->task_scsi_status = SAM_STAT_CHECK_CONDITION; - task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST; - TASK_CMD(task)->transport_error_status = - PYX_TRANSPORT_ILLEGAL_REQUEST; - } + cmd->scsi_status = scsi_status; - transport_complete_task(task, good); -} -EXPORT_SYMBOL(transport_complete_sync_cache); -/* transport_complete_task(): - * - * Called from interrupt and non interrupt context depending - * on the transport plugin. - */ -void transport_complete_task(struct se_task *task, int success) -{ - struct se_cmd *cmd = TASK_CMD(task); - struct se_device *dev = task->se_dev; - int t_state; - unsigned long flags; -#if 0 - printk(KERN_INFO "task: %p CDB: 0x%02x obj_ptr: %p\n", task, - T_TASK(cmd)->t_task_cdb[0], dev); -#endif - if (dev) { - spin_lock_irqsave(&SE_HBA(dev)->hba_queue_lock, flags); - atomic_inc(&dev->depth_left); - atomic_inc(&SE_HBA(dev)->left_queue_depth); - spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags); - } - - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - atomic_set(&task->task_active, 0); + spin_lock_irqsave(&cmd->t_state_lock, flags); + cmd->transport_state &= ~CMD_T_BUSY; - /* - * See if any sense data exists, if so set the TASK_SENSE flag. - * Also check for any other post completion work that needs to be - * done by the plugins. - */ if (dev && dev->transport->transport_complete) { - if (dev->transport->transport_complete(task) != 0) { - cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE; - task->task_sense = 1; + dev->transport->transport_complete(cmd, + cmd->t_data_sg, + transport_get_sense_buffer(cmd)); + if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) success = 1; - } } /* - * See if we are waiting for outstanding struct se_task - * to complete for an exception condition + * See if we are waiting to complete for an exception condition. */ - if (atomic_read(&task->task_stop)) { - /* - * Decrement T_TASK(cmd)->t_se_count if this task had - * previously thrown its timeout exception handler. - */ - if (atomic_read(&task->task_timeout)) { - atomic_dec(&T_TASK(cmd)->t_se_count); - atomic_set(&task->task_timeout, 0); - } - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - - complete(&task->task_stop_comp); - return; - } - /* - * If the task's timeout handler has fired, use the t_task_cdbs_timeout - * left counter to determine when the struct se_cmd is ready to be queued to - * the processing thread. - */ - if (atomic_read(&task->task_timeout)) { - if (!(atomic_dec_and_test( - &T_TASK(cmd)->t_task_cdbs_timeout_left))) { - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, - flags); - return; - } - t_state = TRANSPORT_COMPLETE_TIMEOUT; - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - - transport_add_cmd_to_queue(cmd, t_state); + if (cmd->transport_state & CMD_T_REQUEST_STOP) { + spin_unlock_irqrestore(&cmd->t_state_lock, flags); + complete(&cmd->task_stop_comp); return; } - atomic_dec(&T_TASK(cmd)->t_task_cdbs_timeout_left); /* - * Decrement the outstanding t_task_cdbs_left count. The last - * struct se_task from struct se_cmd will complete itself into the - * device queue depending upon int success. + * Check for case where an explicit ABORT_TASK has been received + * and transport_wait_for_tasks() will be waiting for completion.. */ - if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_left))) { - if (!success) - T_TASK(cmd)->t_tasks_failed = 1; - - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); + if (cmd->transport_state & CMD_T_ABORTED && + cmd->transport_state & CMD_T_STOP) { + spin_unlock_irqrestore(&cmd->t_state_lock, flags); + complete_all(&cmd->t_transport_stop_comp); return; - } - - if (!success || T_TASK(cmd)->t_tasks_failed) { - t_state = TRANSPORT_COMPLETE_FAILURE; - if (!task->task_error_status) { - task->task_error_status = - PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; - cmd->transport_error_status = - PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; - } + } else if (!success) { + INIT_WORK(&cmd->work, target_complete_failure_work); } else { - atomic_set(&T_TASK(cmd)->t_transport_complete, 1); - t_state = TRANSPORT_COMPLETE_OK; - } - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - - transport_add_cmd_to_queue(cmd, t_state); -} -EXPORT_SYMBOL(transport_complete_task); - -/* - * Called by transport_add_tasks_from_cmd() once a struct se_cmd's - * struct se_task list are ready to be added to the active execution list - * struct se_device - - * Called with se_dev_t->execute_task_lock called. - */ -static inline int transport_add_task_check_sam_attr( - struct se_task *task, - struct se_task *task_prev, - struct se_device *dev) -{ - /* - * No SAM Task attribute emulation enabled, add to tail of - * execution queue - */ - if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) { - list_add_tail(&task->t_execute_list, &dev->execute_task_list); - return 0; + INIT_WORK(&cmd->work, target_complete_ok_work); } - /* - * HEAD_OF_QUEUE attribute for received CDB, which means - * the first task that is associated with a struct se_cmd goes to - * head of the struct se_device->execute_task_list, and task_prev - * after that for each subsequent task - */ - if (task->task_se_cmd->sam_task_attr == TASK_ATTR_HOQ) { - list_add(&task->t_execute_list, - (task_prev != NULL) ? - &task_prev->t_execute_list : - &dev->execute_task_list); - - DEBUG_STA("Set HEAD_OF_QUEUE for task CDB: 0x%02x" - " in execution queue\n", - T_TASK(task->task_se_cmd)->t_task_cdb[0]); - return 1; - } - /* - * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been - * transitioned from Dermant -> Active state, and are added to the end - * of the struct se_device->execute_task_list - */ - list_add_tail(&task->t_execute_list, &dev->execute_task_list); - return 0; -} -/* __transport_add_task_to_execute_queue(): - * - * Called with se_dev_t->execute_task_lock called. - */ -static void __transport_add_task_to_execute_queue( - struct se_task *task, - struct se_task *task_prev, - struct se_device *dev) -{ - int head_of_queue; - - head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev); - atomic_inc(&dev->execute_tasks); + cmd->t_state = TRANSPORT_COMPLETE; + cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE); + spin_unlock_irqrestore(&cmd->t_state_lock, flags); - if (atomic_read(&task->task_state_active)) - return; - /* - * Determine if this task needs to go to HEAD_OF_QUEUE for the - * state list as well. Running with SAM Task Attribute emulation - * will always return head_of_queue == 0 here - */ - if (head_of_queue) - list_add(&task->t_state_list, (task_prev) ? - &task_prev->t_state_list : - &dev->state_task_list); - else - list_add_tail(&task->t_state_list, &dev->state_task_list); - - atomic_set(&task->task_state_active, 1); - - DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n", - CMD_TFO(task->task_se_cmd)->get_task_tag(task->task_se_cmd), - task, dev); + queue_work(target_completion_wq, &cmd->work); } +EXPORT_SYMBOL(target_complete_cmd); -static void transport_add_tasks_to_state_queue(struct se_cmd *cmd) +void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length) { - struct se_device *dev; - struct se_task *task; - unsigned long flags; - - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) { - dev = task->se_dev; - - if (atomic_read(&task->task_state_active)) - continue; - - spin_lock(&dev->execute_task_lock); - list_add_tail(&task->t_state_list, &dev->state_task_list); - atomic_set(&task->task_state_active, 1); - - DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n", - CMD_TFO(task->task_se_cmd)->get_task_tag( - task->task_se_cmd), task, dev); + if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) { + if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { + cmd->residual_count += cmd->data_length - length; + } else { + cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; + cmd->residual_count = cmd->data_length - length; + } - spin_unlock(&dev->execute_task_lock); + cmd->data_length = length; } - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); + + target_complete_cmd(cmd, scsi_status); } +EXPORT_SYMBOL(target_complete_cmd_with_length); -static void transport_add_tasks_from_cmd(struct se_cmd *cmd) +static void target_add_to_state_list(struct se_cmd *cmd) { - struct se_device *dev = SE_DEV(cmd); - struct se_task *task, *task_prev = NULL; + struct se_device *dev = cmd->se_dev; unsigned long flags; spin_lock_irqsave(&dev->execute_task_lock, flags); - list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) { - if (atomic_read(&task->task_execute_queue)) - continue; - /* - * __transport_add_task_to_execute_queue() handles the - * SAM Task Attribute emulation if enabled - */ - __transport_add_task_to_execute_queue(task, task_prev, dev); - atomic_set(&task->task_execute_queue, 1); - task_prev = task; + if (!cmd->state_active) { + list_add_tail(&cmd->state_list, &dev->state_list); + cmd->state_active = true; } spin_unlock_irqrestore(&dev->execute_task_lock, flags); - - return; } -/* transport_get_task_from_execute_queue(): - * - * Called with dev->execute_task_lock held. +/* + * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status */ -static struct se_task * -transport_get_task_from_execute_queue(struct se_device *dev) +static void transport_write_pending_qf(struct se_cmd *cmd); +static void transport_complete_qf(struct se_cmd *cmd); + +void target_qf_do_work(struct work_struct *work) { - struct se_task *task; + struct se_device *dev = container_of(work, struct se_device, + qf_work_queue); + LIST_HEAD(qf_cmd_list); + struct se_cmd *cmd, *cmd_tmp; - if (list_empty(&dev->execute_task_list)) - return NULL; + spin_lock_irq(&dev->qf_cmd_lock); + list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); + spin_unlock_irq(&dev->qf_cmd_lock); - list_for_each_entry(task, &dev->execute_task_list, t_execute_list) - break; + list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { + list_del(&cmd->se_qf_node); + atomic_dec(&dev->dev_qf_count); + smp_mb__after_atomic(); - list_del(&task->t_execute_list); - atomic_dec(&dev->execute_tasks); + pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" + " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, + (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : + (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" + : "UNKNOWN"); - return task; -} - -/* transport_remove_task_from_execute_queue(): - * - * - */ -static void transport_remove_task_from_execute_queue( - struct se_task *task, - struct se_device *dev) -{ - unsigned long flags; - - spin_lock_irqsave(&dev->execute_task_lock, flags); - list_del(&task->t_execute_list); - atomic_dec(&dev->execute_tasks); - spin_unlock_irqrestore(&dev->execute_task_lock, flags); + if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) + transport_write_pending_qf(cmd); + else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) + transport_complete_qf(cmd); + } } unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) @@ -1243,72 +792,18 @@ void transport_dump_dev_state( int *bl) { *bl += sprintf(b + *bl, "Status: "); - switch (dev->dev_status) { - case TRANSPORT_DEVICE_ACTIVATED: + if (dev->export_count) *bl += sprintf(b + *bl, "ACTIVATED"); - break; - case TRANSPORT_DEVICE_DEACTIVATED: + else *bl += sprintf(b + *bl, "DEACTIVATED"); - break; - case TRANSPORT_DEVICE_SHUTDOWN: - *bl += sprintf(b + *bl, "SHUTDOWN"); - break; - case TRANSPORT_DEVICE_OFFLINE_ACTIVATED: - case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED: - *bl += sprintf(b + *bl, "OFFLINE"); - break; - default: - *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status); - break; - } - *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d", - atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left), - dev->queue_depth); - *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n", - DEV_ATTRIB(dev)->block_size, DEV_ATTRIB(dev)->max_sectors); + *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth); + *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n", + dev->dev_attrib.block_size, + dev->dev_attrib.hw_max_sectors); *bl += sprintf(b + *bl, " "); } -/* transport_release_all_cmds(): - * - * - */ -static void transport_release_all_cmds(struct se_device *dev) -{ - struct se_cmd *cmd = NULL; - struct se_queue_req *qr = NULL, *qr_p = NULL; - int bug_out = 0, t_state; - unsigned long flags; - - spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags); - list_for_each_entry_safe(qr, qr_p, &dev->dev_queue_obj->qobj_list, - qr_list) { - - cmd = (struct se_cmd *)qr->cmd; - t_state = qr->state; - list_del(&qr->qr_list); - kfree(qr); - spin_unlock_irqrestore(&dev->dev_queue_obj->cmd_queue_lock, - flags); - - printk(KERN_ERR "Releasing ITT: 0x%08x, i_state: %u," - " t_state: %u directly\n", - CMD_TFO(cmd)->get_task_tag(cmd), - CMD_TFO(cmd)->get_cmd_state(cmd), t_state); - - transport_release_fe_cmd(cmd); - bug_out = 1; - - spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags); - } - spin_unlock_irqrestore(&dev->dev_queue_obj->cmd_queue_lock, flags); -#if 0 - if (bug_out) - BUG(); -#endif -} - void transport_dump_vpd_proto_id( struct t10_vpd *vpd, unsigned char *p_buf, @@ -1359,7 +854,7 @@ void transport_dump_vpd_proto_id( if (p_buf) strncpy(p_buf, buf, p_buf_len); else - printk(KERN_INFO "%s", buf); + pr_debug("%s", buf); } void @@ -1384,7 +879,8 @@ int transport_dump_vpd_assoc( int p_buf_len) { unsigned char buf[VPD_TMP_BUF_SIZE]; - int ret = 0, len; + int ret = 0; + int len; memset(buf, 0, VPD_TMP_BUF_SIZE); len = sprintf(buf, "T10 VPD Identifier Association: "); @@ -1401,14 +897,14 @@ int transport_dump_vpd_assoc( break; default: sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); - ret = -1; + ret = -EINVAL; break; } if (p_buf) strncpy(p_buf, buf, p_buf_len); else - printk("%s", buf); + pr_debug("%s", buf); return ret; } @@ -1431,7 +927,8 @@ int transport_dump_vpd_ident_type( int p_buf_len) { unsigned char buf[VPD_TMP_BUF_SIZE]; - int ret = 0, len; + int ret = 0; + int len; memset(buf, 0, VPD_TMP_BUF_SIZE); len = sprintf(buf, "T10 VPD Identifier Type: "); @@ -1458,14 +955,17 @@ int transport_dump_vpd_ident_type( default: sprintf(buf+len, "Unsupported: 0x%02x\n", vpd->device_identifier_type); - ret = -1; + ret = -EINVAL; break; } - if (p_buf) + if (p_buf) { + if (p_buf_len < strlen(buf)+1) + return -EINVAL; strncpy(p_buf, buf, p_buf_len); - else - printk("%s", buf); + } else { + pr_debug("%s", buf); + } return ret; } @@ -1494,28 +994,31 @@ int transport_dump_vpd_ident( switch (vpd->device_identifier_code_set) { case 0x01: /* Binary */ - sprintf(buf, "T10 VPD Binary Device Identifier: %s\n", + snprintf(buf, sizeof(buf), + "T10 VPD Binary Device Identifier: %s\n", &vpd->device_identifier[0]); break; case 0x02: /* ASCII */ - sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n", + snprintf(buf, sizeof(buf), + "T10 VPD ASCII Device Identifier: %s\n", &vpd->device_identifier[0]); break; case 0x03: /* UTF-8 */ - sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n", + snprintf(buf, sizeof(buf), + "T10 VPD UTF-8 Device Identifier: %s\n", &vpd->device_identifier[0]); break; default: sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" " 0x%02x", vpd->device_identifier_code_set); - ret = -1; + ret = -EINVAL; break; } if (p_buf) strncpy(p_buf, buf, p_buf_len); else - printk("%s", buf); + pr_debug("%s", buf); return ret; } @@ -1524,7 +1027,7 @@ int transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) { static const char hex_str[] = "0123456789abcdef"; - int j = 0, i = 4; /* offset to start of the identifer */ + int j = 0, i = 4; /* offset to start of the identifier */ /* * The VPD Code Set (encoding) @@ -1557,273 +1060,54 @@ transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) } EXPORT_SYMBOL(transport_set_vpd_ident); -static void core_setup_task_attr_emulation(struct se_device *dev) +sense_reason_t +target_cmd_size_check(struct se_cmd *cmd, unsigned int size) { - /* - * If this device is from Target_Core_Mod/pSCSI, disable the - * SAM Task Attribute emulation. - * - * This is currently not available in upsream Linux/SCSI Target - * mode code, and is assumed to be disabled while using TCM/pSCSI. - */ - if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) { - dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH; - return; - } - - dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED; - DEBUG_STA("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x" - " device\n", TRANSPORT(dev)->name, - TRANSPORT(dev)->get_device_rev(dev)); -} - -static void scsi_dump_inquiry(struct se_device *dev) -{ - struct t10_wwn *wwn = DEV_T10_WWN(dev); - int i, device_type; - /* - * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer - */ - printk(" Vendor: "); - for (i = 0; i < 8; i++) - if (wwn->vendor[i] >= 0x20) - printk("%c", wwn->vendor[i]); - else - printk(" "); - - printk(" Model: "); - for (i = 0; i < 16; i++) - if (wwn->model[i] >= 0x20) - printk("%c", wwn->model[i]); - else - printk(" "); - - printk(" Revision: "); - for (i = 0; i < 4; i++) - if (wwn->revision[i] >= 0x20) - printk("%c", wwn->revision[i]); - else - printk(" "); - - printk("\n"); - - device_type = TRANSPORT(dev)->get_device_type(dev); - printk(" Type: %s ", scsi_device_type(device_type)); - printk(" ANSI SCSI revision: %02x\n", - TRANSPORT(dev)->get_device_rev(dev)); -} - -struct se_device *transport_add_device_to_core_hba( - struct se_hba *hba, - struct se_subsystem_api *transport, - struct se_subsystem_dev *se_dev, - u32 device_flags, - void *transport_dev, - struct se_dev_limits *dev_limits, - const char *inquiry_prod, - const char *inquiry_rev) -{ - int ret = 0, force_pt; - struct se_device *dev; - - dev = kzalloc(sizeof(struct se_device), GFP_KERNEL); - if (!(dev)) { - printk(KERN_ERR "Unable to allocate memory for se_dev_t\n"); - return NULL; - } - dev->dev_queue_obj = kzalloc(sizeof(struct se_queue_obj), GFP_KERNEL); - if (!(dev->dev_queue_obj)) { - printk(KERN_ERR "Unable to allocate memory for" - " dev->dev_queue_obj\n"); - kfree(dev); - return NULL; - } - transport_init_queue_obj(dev->dev_queue_obj); - - dev->dev_status_queue_obj = kzalloc(sizeof(struct se_queue_obj), - GFP_KERNEL); - if (!(dev->dev_status_queue_obj)) { - printk(KERN_ERR "Unable to allocate memory for" - " dev->dev_status_queue_obj\n"); - kfree(dev->dev_queue_obj); - kfree(dev); - return NULL; - } - transport_init_queue_obj(dev->dev_status_queue_obj); - - dev->dev_flags = device_flags; - dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED; - dev->dev_ptr = (void *) transport_dev; - dev->se_hba = hba; - dev->se_sub_dev = se_dev; - dev->transport = transport; - atomic_set(&dev->active_cmds, 0); - INIT_LIST_HEAD(&dev->dev_list); - INIT_LIST_HEAD(&dev->dev_sep_list); - INIT_LIST_HEAD(&dev->dev_tmr_list); - INIT_LIST_HEAD(&dev->execute_task_list); - INIT_LIST_HEAD(&dev->delayed_cmd_list); - INIT_LIST_HEAD(&dev->ordered_cmd_list); - INIT_LIST_HEAD(&dev->state_task_list); - spin_lock_init(&dev->execute_task_lock); - spin_lock_init(&dev->delayed_cmd_lock); - spin_lock_init(&dev->ordered_cmd_lock); - spin_lock_init(&dev->state_task_lock); - spin_lock_init(&dev->dev_alua_lock); - spin_lock_init(&dev->dev_reservation_lock); - spin_lock_init(&dev->dev_status_lock); - spin_lock_init(&dev->dev_status_thr_lock); - spin_lock_init(&dev->se_port_lock); - spin_lock_init(&dev->se_tmr_lock); - - dev->queue_depth = dev_limits->queue_depth; - atomic_set(&dev->depth_left, dev->queue_depth); - atomic_set(&dev->dev_ordered_id, 0); - - se_dev_set_default_attribs(dev, dev_limits); - - dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); - dev->creation_time = get_jiffies_64(); - spin_lock_init(&dev->stats_lock); - - spin_lock(&hba->device_lock); - list_add_tail(&dev->dev_list, &hba->hba_dev_list); - hba->dev_count++; - spin_unlock(&hba->device_lock); - /* - * Setup the SAM Task Attribute emulation for struct se_device - */ - core_setup_task_attr_emulation(dev); - /* - * Force PR and ALUA passthrough emulation with internal object use. - */ - force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE); - /* - * Setup the Reservations infrastructure for struct se_device - */ - core_setup_reservations(dev, force_pt); - /* - * Setup the Asymmetric Logical Unit Assignment for struct se_device - */ - if (core_setup_alua(dev, force_pt) < 0) - goto out; + struct se_device *dev = cmd->se_dev; - /* - * Startup the struct se_device processing thread - */ - dev->process_thread = kthread_run(transport_processing_thread, dev, - "LIO_%s", TRANSPORT(dev)->name); - if (IS_ERR(dev->process_thread)) { - printk(KERN_ERR "Unable to create kthread: LIO_%s\n", - TRANSPORT(dev)->name); - goto out; - } + if (cmd->unknown_data_length) { + cmd->data_length = size; + } else if (size != cmd->data_length) { + pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" + " %u does not match SCSI CDB Length: %u for SAM Opcode:" + " 0x%02x\n", cmd->se_tfo->get_fabric_name(), + cmd->data_length, size, cmd->t_task_cdb[0]); - /* - * Preload the initial INQUIRY const values if we are doing - * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI - * passthrough because this is being provided by the backend LLD. - * This is required so that transport_get_inquiry() copies these - * originals once back into DEV_T10_WWN(dev) for the virtual device - * setup. - */ - if (TRANSPORT(dev)->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { - if (!(inquiry_prod) || !(inquiry_prod)) { - printk(KERN_ERR "All non TCM/pSCSI plugins require" - " INQUIRY consts\n"); - goto out; + if (cmd->data_direction == DMA_TO_DEVICE) { + pr_err("Rejecting underflow/overflow" + " WRITE data\n"); + return TCM_INVALID_CDB_FIELD; + } + /* + * Reject READ_* or WRITE_* with overflow/underflow for + * type SCF_SCSI_DATA_CDB. + */ + if (dev->dev_attrib.block_size != 512) { + pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" + " CDB on non 512-byte sector setup subsystem" + " plugin: %s\n", dev->transport->name); + /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ + return TCM_INVALID_CDB_FIELD; + } + /* + * For the overflow case keep the existing fabric provided + * ->data_length. Otherwise for the underflow case, reset + * ->data_length to the smaller SCSI expected data transfer + * length. + */ + if (size > cmd->data_length) { + cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; + cmd->residual_count = (size - cmd->data_length); + } else { + cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; + cmd->residual_count = (cmd->data_length - size); + cmd->data_length = size; } - - strncpy(&DEV_T10_WWN(dev)->vendor[0], "LIO-ORG", 8); - strncpy(&DEV_T10_WWN(dev)->model[0], inquiry_prod, 16); - strncpy(&DEV_T10_WWN(dev)->revision[0], inquiry_rev, 4); - } - scsi_dump_inquiry(dev); - -out: - if (!ret) - return dev; - kthread_stop(dev->process_thread); - - spin_lock(&hba->device_lock); - list_del(&dev->dev_list); - hba->dev_count--; - spin_unlock(&hba->device_lock); - - se_release_vpd_for_dev(dev); - - kfree(dev->dev_status_queue_obj); - kfree(dev->dev_queue_obj); - kfree(dev); - - return NULL; -} -EXPORT_SYMBOL(transport_add_device_to_core_hba); - -/* transport_generic_prepare_cdb(): - * - * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will - * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2. - * The point of this is since we are mapping iSCSI LUNs to - * SCSI Target IDs having a non-zero LUN in the CDB will throw the - * devices and HBAs for a loop. - */ -static inline void transport_generic_prepare_cdb( - unsigned char *cdb) -{ - switch (cdb[0]) { - case READ_10: /* SBC - RDProtect */ - case READ_12: /* SBC - RDProtect */ - case READ_16: /* SBC - RDProtect */ - case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */ - case VERIFY: /* SBC - VRProtect */ - case VERIFY_16: /* SBC - VRProtect */ - case WRITE_VERIFY: /* SBC - VRProtect */ - case WRITE_VERIFY_12: /* SBC - VRProtect */ - break; - default: - cdb[1] &= 0x1f; /* clear logical unit number */ - break; - } -} - -static struct se_task * -transport_generic_get_task(struct se_cmd *cmd, - enum dma_data_direction data_direction) -{ - struct se_task *task; - struct se_device *dev = SE_DEV(cmd); - unsigned long flags; - - task = dev->transport->alloc_task(cmd); - if (!task) { - printk(KERN_ERR "Unable to allocate struct se_task\n"); - return NULL; } - INIT_LIST_HEAD(&task->t_list); - INIT_LIST_HEAD(&task->t_execute_list); - INIT_LIST_HEAD(&task->t_state_list); - init_completion(&task->task_stop_comp); - task->task_no = T_TASK(cmd)->t_tasks_no++; - task->task_se_cmd = cmd; - task->se_dev = dev; - task->task_data_direction = data_direction; - - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - list_add_tail(&task->t_list, &T_TASK(cmd)->t_task_list); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - - return task; -} - -static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *); + return 0; -void transport_device_setup_cmd(struct se_cmd *cmd) -{ - cmd->se_dev = SE_LUN(cmd)->lun_se_dev; } -EXPORT_SYMBOL(transport_device_setup_cmd); /* * Used by fabric modules containing a local struct se_cmd within their @@ -1838,20 +1122,16 @@ void transport_init_se_cmd( int task_attr, unsigned char *sense_buffer) { - INIT_LIST_HEAD(&cmd->se_lun_list); - INIT_LIST_HEAD(&cmd->se_delayed_list); - INIT_LIST_HEAD(&cmd->se_ordered_list); - /* - * Setup t_task pointer to t_task_backstore - */ - cmd->t_task = &cmd->t_task_backstore; - - INIT_LIST_HEAD(&T_TASK(cmd)->t_task_list); - init_completion(&T_TASK(cmd)->transport_lun_fe_stop_comp); - init_completion(&T_TASK(cmd)->transport_lun_stop_comp); - init_completion(&T_TASK(cmd)->t_transport_stop_comp); - spin_lock_init(&T_TASK(cmd)->t_state_lock); - atomic_set(&T_TASK(cmd)->transport_dev_active, 1); + INIT_LIST_HEAD(&cmd->se_delayed_node); + INIT_LIST_HEAD(&cmd->se_qf_node); + INIT_LIST_HEAD(&cmd->se_cmd_list); + INIT_LIST_HEAD(&cmd->state_list); + init_completion(&cmd->t_transport_stop_comp); + init_completion(&cmd->cmd_wait_comp); + init_completion(&cmd->task_stop_comp); + spin_lock_init(&cmd->t_state_lock); + kref_init(&cmd->cmd_kref); + cmd->transport_state = CMD_T_DEV_ACTIVE; cmd->se_tfo = tfo; cmd->se_sess = se_sess; @@ -1859,2067 +1139,919 @@ void transport_init_se_cmd( cmd->data_direction = data_direction; cmd->sam_task_attr = task_attr; cmd->sense_buffer = sense_buffer; + + cmd->state_active = false; } EXPORT_SYMBOL(transport_init_se_cmd); -static int transport_check_alloc_task_attr(struct se_cmd *cmd) +static sense_reason_t +transport_check_alloc_task_attr(struct se_cmd *cmd) { + struct se_device *dev = cmd->se_dev; + /* * Check if SAM Task Attribute emulation is enabled for this * struct se_device storage object */ - if (SE_DEV(cmd)->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) + if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) return 0; - if (cmd->sam_task_attr == TASK_ATTR_ACA) { - DEBUG_STA("SAM Task Attribute ACA" + if (cmd->sam_task_attr == MSG_ACA_TAG) { + pr_debug("SAM Task Attribute ACA" " emulation is not supported\n"); - return -1; + return TCM_INVALID_CDB_FIELD; } /* * Used to determine when ORDERED commands should go from * Dormant to Active status. */ - cmd->se_ordered_id = atomic_inc_return(&SE_DEV(cmd)->dev_ordered_id); - smp_mb__after_atomic_inc(); - DEBUG_STA("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", + cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id); + smp_mb__after_atomic(); + pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", cmd->se_ordered_id, cmd->sam_task_attr, - TRANSPORT(cmd->se_dev)->name); + dev->transport->name); return 0; } -void transport_free_se_cmd( - struct se_cmd *se_cmd) -{ - if (se_cmd->se_tmr_req) - core_tmr_release_req(se_cmd->se_tmr_req); - /* - * Check and free any extended CDB buffer that was allocated - */ - if (T_TASK(se_cmd)->t_task_cdb != T_TASK(se_cmd)->__t_task_cdb) - kfree(T_TASK(se_cmd)->t_task_cdb); -} -EXPORT_SYMBOL(transport_free_se_cmd); - -static void transport_generic_wait_for_tasks(struct se_cmd *, int, int); - -/* transport_generic_allocate_tasks(): - * - * Called from fabric RX Thread. - */ -int transport_generic_allocate_tasks( - struct se_cmd *cmd, - unsigned char *cdb) +sense_reason_t +target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb) { - int ret; - - transport_generic_prepare_cdb(cdb); - - /* - * This is needed for early exceptions. - */ - cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks; + struct se_device *dev = cmd->se_dev; + sense_reason_t ret; - transport_device_setup_cmd(cmd); /* * Ensure that the received CDB is less than the max (252 + 8) bytes * for VARIABLE_LENGTH_CMD */ if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { - printk(KERN_ERR "Received SCSI CDB with command_size: %d that" + pr_err("Received SCSI CDB with command_size: %d that" " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); - return -1; + return TCM_INVALID_CDB_FIELD; } /* * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, * allocate the additional extended CDB buffer now.. Otherwise * setup the pointer from __t_task_cdb to t_task_cdb. */ - if (scsi_command_size(cdb) > sizeof(T_TASK(cmd)->__t_task_cdb)) { - T_TASK(cmd)->t_task_cdb = kzalloc(scsi_command_size(cdb), + if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { + cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), GFP_KERNEL); - if (!(T_TASK(cmd)->t_task_cdb)) { - printk(KERN_ERR "Unable to allocate T_TASK(cmd)->t_task_cdb" - " %u > sizeof(T_TASK(cmd)->__t_task_cdb): %lu ops\n", + if (!cmd->t_task_cdb) { + pr_err("Unable to allocate cmd->t_task_cdb" + " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", scsi_command_size(cdb), - (unsigned long)sizeof(T_TASK(cmd)->__t_task_cdb)); - return -1; + (unsigned long)sizeof(cmd->__t_task_cdb)); + return TCM_OUT_OF_RESOURCES; } } else - T_TASK(cmd)->t_task_cdb = &T_TASK(cmd)->__t_task_cdb[0]; + cmd->t_task_cdb = &cmd->__t_task_cdb[0]; /* - * Copy the original CDB into T_TASK(cmd). + * Copy the original CDB into cmd-> */ - memcpy(T_TASK(cmd)->t_task_cdb, cdb, scsi_command_size(cdb)); + memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); + + trace_target_sequencer_start(cmd); + /* - * Setup the received CDB based on SCSI defined opcodes and - * perform unit attention, persistent reservations and ALUA - * checks for virtual device backends. The T_TASK(cmd)->t_task_cdb - * pointer is expected to be setup before we reach this point. + * Check for an existing UNIT ATTENTION condition */ - ret = transport_generic_cmd_sequencer(cmd, cdb); - if (ret < 0) + ret = target_scsi3_ua_check(cmd); + if (ret) + return ret; + + ret = target_alua_state_check(cmd); + if (ret) + return ret; + + ret = target_check_reservation(cmd); + if (ret) { + cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; return ret; - /* - * Check for SAM Task Attribute Emulation - */ - if (transport_check_alloc_task_attr(cmd) < 0) { - cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; - cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; - return -2; } + + ret = dev->transport->parse_cdb(cmd); + if (ret) + return ret; + + ret = transport_check_alloc_task_attr(cmd); + if (ret) + return ret; + + cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; + spin_lock(&cmd->se_lun->lun_sep_lock); if (cmd->se_lun->lun_sep) cmd->se_lun->lun_sep->sep_stats.cmd_pdus++; spin_unlock(&cmd->se_lun->lun_sep_lock); return 0; } -EXPORT_SYMBOL(transport_generic_allocate_tasks); +EXPORT_SYMBOL(target_setup_cmd_from_cdb); /* - * Used by fabric module frontends not defining a TFO->new_cmd_map() - * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis + * Used by fabric module frontends to queue tasks directly. + * Many only be used from process context only */ -int transport_generic_handle_cdb( +int transport_handle_cdb_direct( struct se_cmd *cmd) { - if (!SE_LUN(cmd)) { + sense_reason_t ret; + + if (!cmd->se_lun) { + dump_stack(); + pr_err("cmd->se_lun is NULL\n"); + return -EINVAL; + } + if (in_interrupt()) { dump_stack(); - printk(KERN_ERR "SE_LUN(cmd) is NULL\n"); - return -1; + pr_err("transport_generic_handle_cdb cannot be called" + " from interrupt context\n"); + return -EINVAL; } + /* + * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that + * outstanding descriptors are handled correctly during shutdown via + * transport_wait_for_tasks() + * + * Also, we don't take cmd->t_state_lock here as we only expect + * this to be called for initial descriptor submission. + */ + cmd->t_state = TRANSPORT_NEW_CMD; + cmd->transport_state |= CMD_T_ACTIVE; - transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD); + /* + * transport_generic_new_cmd() is already handling QUEUE_FULL, + * so follow TRANSPORT_NEW_CMD processing thread context usage + * and call transport_generic_request_failure() if necessary.. + */ + ret = transport_generic_new_cmd(cmd); + if (ret) + transport_generic_request_failure(cmd, ret); return 0; } -EXPORT_SYMBOL(transport_generic_handle_cdb); +EXPORT_SYMBOL(transport_handle_cdb_direct); -/* - * Used by fabric module frontends defining a TFO->new_cmd_map() caller - * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to - * complete setup in TCM process context w/ TFO->new_cmd_map(). - */ -int transport_generic_handle_cdb_map( - struct se_cmd *cmd) +sense_reason_t +transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl, + u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count) { - if (!SE_LUN(cmd)) { - dump_stack(); - printk(KERN_ERR "SE_LUN(cmd) is NULL\n"); - return -1; + if (!sgl || !sgl_count) + return 0; + + /* + * Reject SCSI data overflow with map_mem_to_cmd() as incoming + * scatterlists already have been set to follow what the fabric + * passes for the original expected data transfer length. + */ + if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { + pr_warn("Rejecting SCSI DATA overflow for fabric using" + " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); + return TCM_INVALID_CDB_FIELD; } - transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP); + cmd->t_data_sg = sgl; + cmd->t_data_nents = sgl_count; + + if (sgl_bidi && sgl_bidi_count) { + cmd->t_bidi_data_sg = sgl_bidi; + cmd->t_bidi_data_nents = sgl_bidi_count; + } + cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; return 0; } -EXPORT_SYMBOL(transport_generic_handle_cdb_map); -/* transport_generic_handle_data(): +/* + * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized + * se_cmd + use pre-allocated SGL memory. + * + * @se_cmd: command descriptor to submit + * @se_sess: associated se_sess for endpoint + * @cdb: pointer to SCSI CDB + * @sense: pointer to SCSI sense buffer + * @unpacked_lun: unpacked LUN to reference for struct se_lun + * @data_length: fabric expected data transfer length + * @task_addr: SAM task attribute + * @data_dir: DMA data direction + * @flags: flags for command submission from target_sc_flags_tables + * @sgl: struct scatterlist memory for unidirectional mapping + * @sgl_count: scatterlist count for unidirectional mapping + * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping + * @sgl_bidi_count: scatterlist count for bidirectional READ mapping + * @sgl_prot: struct scatterlist memory protection information + * @sgl_prot_count: scatterlist count for protection information * + * Returns non zero to signal active I/O shutdown failure. All other + * setup exceptions will be returned as a SCSI CHECK_CONDITION response, + * but still return zero here. * + * This may only be called from process context, and also currently + * assumes internal allocation of fabric payload buffer by target-core. */ -int transport_generic_handle_data( - struct se_cmd *cmd) +int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess, + unsigned char *cdb, unsigned char *sense, u32 unpacked_lun, + u32 data_length, int task_attr, int data_dir, int flags, + struct scatterlist *sgl, u32 sgl_count, + struct scatterlist *sgl_bidi, u32 sgl_bidi_count, + struct scatterlist *sgl_prot, u32 sgl_prot_count) { + struct se_portal_group *se_tpg; + sense_reason_t rc; + int ret; + + se_tpg = se_sess->se_tpg; + BUG_ON(!se_tpg); + BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); + BUG_ON(in_interrupt()); /* - * For the software fabric case, then we assume the nexus is being - * failed/shutdown when signals are pending from the kthread context - * caller, so we return a failure. For the HW target mode case running - * in interrupt code, the signal_pending() check is skipped. + * Initialize se_cmd for target operation. From this point + * exceptions are handled by sending exception status via + * target_core_fabric_ops->queue_status() callback */ - if (!in_interrupt() && signal_pending(current)) - return -1; + transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, + data_length, data_dir, task_attr, sense); + if (flags & TARGET_SCF_UNKNOWN_SIZE) + se_cmd->unknown_data_length = 1; /* - * If the received CDB has aleady been ABORTED by the generic - * target engine, we now call transport_check_aborted_status() - * to queue any delated TASK_ABORTED status for the received CDB to the - * fabric module as we are expecting no futher incoming DATA OUT - * sequences at this point. + * Obtain struct se_cmd->cmd_kref reference and add new cmd to + * se_sess->sess_cmd_list. A second kref_get here is necessary + * for fabrics using TARGET_SCF_ACK_KREF that expect a second + * kref_put() to happen during fabric packet acknowledgement. */ - if (transport_check_aborted_status(cmd, 1) != 0) - return 0; - - transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE); - return 0; -} -EXPORT_SYMBOL(transport_generic_handle_data); - -/* transport_generic_handle_tmr(): - * - * - */ -int transport_generic_handle_tmr( - struct se_cmd *cmd) -{ + ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); + if (ret) + return ret; /* - * This is needed for early exceptions. + * Signal bidirectional data payloads to target-core */ - cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks; - transport_device_setup_cmd(cmd); - - transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR); - return 0; -} -EXPORT_SYMBOL(transport_generic_handle_tmr); - -static int transport_stop_tasks_for_cmd(struct se_cmd *cmd) -{ - struct se_task *task, *task_tmp; - unsigned long flags; - int ret = 0; - - DEBUG_TS("ITT[0x%08x] - Stopping tasks\n", - CMD_TFO(cmd)->get_task_tag(cmd)); - + if (flags & TARGET_SCF_BIDI_OP) + se_cmd->se_cmd_flags |= SCF_BIDI; /* - * No tasks remain in the execution queue + * Locate se_lun pointer and attach it to struct se_cmd */ - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - list_for_each_entry_safe(task, task_tmp, - &T_TASK(cmd)->t_task_list, t_list) { - DEBUG_TS("task_no[%d] - Processing task %p\n", - task->task_no, task); - /* - * If the struct se_task has not been sent and is not active, - * remove the struct se_task from the execution queue. - */ - if (!atomic_read(&task->task_sent) && - !atomic_read(&task->task_active)) { - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, - flags); - transport_remove_task_from_execute_queue(task, - task->se_dev); - - DEBUG_TS("task_no[%d] - Removed from execute queue\n", - task->task_no); - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - continue; - } - - /* - * If the struct se_task is active, sleep until it is returned - * from the plugin. - */ - if (atomic_read(&task->task_active)) { - atomic_set(&task->task_stop, 1); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, - flags); - - DEBUG_TS("task_no[%d] - Waiting to complete\n", - task->task_no); - wait_for_completion(&task->task_stop_comp); - DEBUG_TS("task_no[%d] - Stopped successfully\n", - task->task_no); - - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - atomic_dec(&T_TASK(cmd)->t_task_cdbs_left); - - atomic_set(&task->task_active, 0); - atomic_set(&task->task_stop, 0); - } else { - DEBUG_TS("task_no[%d] - Did nothing\n", task->task_no); - ret++; - } - - __transport_stop_task_timer(task, &flags); + rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun); + if (rc) { + transport_send_check_condition_and_sense(se_cmd, rc, 0); + target_put_sess_cmd(se_sess, se_cmd); + return 0; } - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - return ret; -} - -static void transport_failure_reset_queue_depth(struct se_device *dev) -{ - unsigned long flags; - - spin_lock_irqsave(&SE_HBA(dev)->hba_queue_lock, flags);; - atomic_inc(&dev->depth_left); - atomic_inc(&SE_HBA(dev)->left_queue_depth); - spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags); -} + rc = target_setup_cmd_from_cdb(se_cmd, cdb); + if (rc != 0) { + transport_generic_request_failure(se_cmd, rc); + return 0; + } -/* - * Handle SAM-esque emulation for generic transport request failures. - */ -static void transport_generic_request_failure( - struct se_cmd *cmd, - struct se_device *dev, - int complete, - int sc) -{ - DEBUG_GRF("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" - " CDB: 0x%02x\n", cmd, CMD_TFO(cmd)->get_task_tag(cmd), - T_TASK(cmd)->t_task_cdb[0]); - DEBUG_GRF("-----[ i_state: %d t_state/def_t_state:" - " %d/%d transport_error_status: %d\n", - CMD_TFO(cmd)->get_cmd_state(cmd), - cmd->t_state, cmd->deferred_t_state, - cmd->transport_error_status); - DEBUG_GRF("-----[ t_task_cdbs: %d t_task_cdbs_left: %d" - " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --" - " t_transport_active: %d t_transport_stop: %d" - " t_transport_sent: %d\n", T_TASK(cmd)->t_task_cdbs, - atomic_read(&T_TASK(cmd)->t_task_cdbs_left), - atomic_read(&T_TASK(cmd)->t_task_cdbs_sent), - atomic_read(&T_TASK(cmd)->t_task_cdbs_ex_left), - atomic_read(&T_TASK(cmd)->t_transport_active), - atomic_read(&T_TASK(cmd)->t_transport_stop), - atomic_read(&T_TASK(cmd)->t_transport_sent)); - - transport_stop_all_task_timers(cmd); - - if (dev) - transport_failure_reset_queue_depth(dev); /* - * For SAM Task Attribute emulation for failed struct se_cmd + * Save pointers for SGLs containing protection information, + * if present. */ - if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) - transport_complete_task_attr(cmd); - - if (complete) { - transport_direct_request_timeout(cmd); - cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE; + if (sgl_prot_count) { + se_cmd->t_prot_sg = sgl_prot; + se_cmd->t_prot_nents = sgl_prot_count; } - switch (cmd->transport_error_status) { - case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE: - cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; - break; - case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS: - cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY; - break; - case PYX_TRANSPORT_INVALID_CDB_FIELD: - cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; - break; - case PYX_TRANSPORT_INVALID_PARAMETER_LIST: - cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; - break; - case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES: - if (!sc) - transport_new_cmd_failure(cmd); - /* - * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES, - * we force this session to fall back to session - * recovery. - */ - CMD_TFO(cmd)->fall_back_to_erl0(cmd->se_sess); - CMD_TFO(cmd)->stop_session(cmd->se_sess, 0, 0); - - goto check_stop; - case PYX_TRANSPORT_LU_COMM_FAILURE: - case PYX_TRANSPORT_ILLEGAL_REQUEST: - cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; - break; - case PYX_TRANSPORT_UNKNOWN_MODE_PAGE: - cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE; - break; - case PYX_TRANSPORT_WRITE_PROTECTED: - cmd->scsi_sense_reason = TCM_WRITE_PROTECTED; - break; - case PYX_TRANSPORT_RESERVATION_CONFLICT: - /* - * No SENSE Data payload for this case, set SCSI Status - * and queue the response to $FABRIC_MOD. - * - * Uses linux/include/scsi/scsi.h SAM status codes defs - */ - cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; - /* - * For UA Interlock Code 11b, a RESERVATION CONFLICT will - * establish a UNIT ATTENTION with PREVIOUS RESERVATION - * CONFLICT STATUS. - * - * See spc4r17, section 7.4.6 Control Mode Page, Table 349 - */ - if (SE_SESS(cmd) && - DEV_ATTRIB(cmd->se_dev)->emulate_ua_intlck_ctrl == 2) - core_scsi3_ua_allocate(SE_SESS(cmd)->se_node_acl, - cmd->orig_fe_lun, 0x2C, - ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); + /* + * When a non zero sgl_count has been passed perform SGL passthrough + * mapping for pre-allocated fabric memory instead of having target + * core perform an internal SGL allocation.. + */ + if (sgl_count != 0) { + BUG_ON(!sgl); - CMD_TFO(cmd)->queue_status(cmd); - goto check_stop; - case PYX_TRANSPORT_USE_SENSE_REASON: /* - * struct se_cmd->scsi_sense_reason already set + * A work-around for tcm_loop as some userspace code via + * scsi-generic do not memset their associated read buffers, + * so go ahead and do that here for type non-data CDBs. Also + * note that this is currently guaranteed to be a single SGL + * for this case by target core in target_setup_cmd_from_cdb() + * -> transport_generic_cmd_sequencer(). */ - break; - default: - printk(KERN_ERR "Unknown transport error for CDB 0x%02x: %d\n", - T_TASK(cmd)->t_task_cdb[0], - cmd->transport_error_status); - cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; - break; - } + if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && + se_cmd->data_direction == DMA_FROM_DEVICE) { + unsigned char *buf = NULL; - if (!sc) - transport_new_cmd_failure(cmd); - else - transport_send_check_condition_and_sense(cmd, - cmd->scsi_sense_reason, 0); -check_stop: - transport_lun_remove_cmd(cmd); - if (!(transport_cmd_check_stop_to_fabric(cmd))) - ; -} + if (sgl) + buf = kmap(sg_page(sgl)) + sgl->offset; -static void transport_direct_request_timeout(struct se_cmd *cmd) -{ - unsigned long flags; + if (buf) { + memset(buf, 0, sgl->length); + kunmap(sg_page(sgl)); + } + } - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - if (!(atomic_read(&T_TASK(cmd)->t_transport_timeout))) { - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - return; - } - if (atomic_read(&T_TASK(cmd)->t_task_cdbs_timeout_left)) { - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - return; + rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count, + sgl_bidi, sgl_bidi_count); + if (rc != 0) { + transport_generic_request_failure(se_cmd, rc); + return 0; + } } - atomic_sub(atomic_read(&T_TASK(cmd)->t_transport_timeout), - &T_TASK(cmd)->t_se_count); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); -} - -static void transport_generic_request_timeout(struct se_cmd *cmd) -{ - unsigned long flags; - /* - * Reset T_TASK(cmd)->t_se_count to allow transport_generic_remove() - * to allow last call to free memory resources. + * Check if we need to delay processing because of ALUA + * Active/NonOptimized primary access state.. */ - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - if (atomic_read(&T_TASK(cmd)->t_transport_timeout) > 1) { - int tmp = (atomic_read(&T_TASK(cmd)->t_transport_timeout) - 1); - - atomic_sub(tmp, &T_TASK(cmd)->t_se_count); - } - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - - transport_generic_remove(cmd, 0, 0); -} - -static int -transport_generic_allocate_buf(struct se_cmd *cmd, u32 data_length) -{ - unsigned char *buf; - - buf = kzalloc(data_length, GFP_KERNEL); - if (!(buf)) { - printk(KERN_ERR "Unable to allocate memory for buffer\n"); - return -1; - } - - T_TASK(cmd)->t_tasks_se_num = 0; - T_TASK(cmd)->t_task_buf = buf; + core_alua_check_nonop_delay(se_cmd); + transport_handle_cdb_direct(se_cmd); return 0; } - -static inline u32 transport_lba_21(unsigned char *cdb) -{ - return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; -} - -static inline u32 transport_lba_32(unsigned char *cdb) -{ - return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; -} - -static inline unsigned long long transport_lba_64(unsigned char *cdb) -{ - unsigned int __v1, __v2; - - __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; - __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; - - return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; -} +EXPORT_SYMBOL(target_submit_cmd_map_sgls); /* - * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs + * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd + * + * @se_cmd: command descriptor to submit + * @se_sess: associated se_sess for endpoint + * @cdb: pointer to SCSI CDB + * @sense: pointer to SCSI sense buffer + * @unpacked_lun: unpacked LUN to reference for struct se_lun + * @data_length: fabric expected data transfer length + * @task_addr: SAM task attribute + * @data_dir: DMA data direction + * @flags: flags for command submission from target_sc_flags_tables + * + * Returns non zero to signal active I/O shutdown failure. All other + * setup exceptions will be returned as a SCSI CHECK_CONDITION response, + * but still return zero here. + * + * This may only be called from process context, and also currently + * assumes internal allocation of fabric payload buffer by target-core. + * + * It also assumes interal target core SGL memory allocation. */ -static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) +int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, + unsigned char *cdb, unsigned char *sense, u32 unpacked_lun, + u32 data_length, int task_attr, int data_dir, int flags) { - unsigned int __v1, __v2; - - __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; - __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; - - return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; + return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense, + unpacked_lun, data_length, task_attr, data_dir, + flags, NULL, 0, NULL, 0, NULL, 0); } +EXPORT_SYMBOL(target_submit_cmd); -static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd) +static void target_complete_tmr_failure(struct work_struct *work) { - unsigned long flags; + struct se_cmd *se_cmd = container_of(work, struct se_cmd, work); - spin_lock_irqsave(&T_TASK(se_cmd)->t_state_lock, flags); - se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; - spin_unlock_irqrestore(&T_TASK(se_cmd)->t_state_lock, flags); + se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; + se_cmd->se_tfo->queue_tm_rsp(se_cmd); + + transport_cmd_check_stop_to_fabric(se_cmd); } -/* - * Called from interrupt context. - */ -static void transport_task_timeout_handler(unsigned long data) +/** + * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd + * for TMR CDBs + * + * @se_cmd: command descriptor to submit + * @se_sess: associated se_sess for endpoint + * @sense: pointer to SCSI sense buffer + * @unpacked_lun: unpacked LUN to reference for struct se_lun + * @fabric_context: fabric context for TMR req + * @tm_type: Type of TM request + * @gfp: gfp type for caller + * @tag: referenced task tag for TMR_ABORT_TASK + * @flags: submit cmd flags + * + * Callable from all contexts. + **/ + +int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, + unsigned char *sense, u32 unpacked_lun, + void *fabric_tmr_ptr, unsigned char tm_type, + gfp_t gfp, unsigned int tag, int flags) { - struct se_task *task = (struct se_task *)data; - struct se_cmd *cmd = TASK_CMD(task); - unsigned long flags; + struct se_portal_group *se_tpg; + int ret; - DEBUG_TT("transport task timeout fired! task: %p cmd: %p\n", task, cmd); - - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - if (task->task_flags & TF_STOP) { - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - return; - } - task->task_flags &= ~TF_RUNNING; + se_tpg = se_sess->se_tpg; + BUG_ON(!se_tpg); + transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, + 0, DMA_NONE, MSG_SIMPLE_TAG, sense); /* - * Determine if transport_complete_task() has already been called. + * FIXME: Currently expect caller to handle se_cmd->se_tmr_req + * allocation failure. */ - if (!(atomic_read(&task->task_active))) { - DEBUG_TT("transport task: %p cmd: %p timeout task_active" - " == 0\n", task, cmd); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - return; - } - - atomic_inc(&T_TASK(cmd)->t_se_count); - atomic_inc(&T_TASK(cmd)->t_transport_timeout); - T_TASK(cmd)->t_tasks_failed = 1; + ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp); + if (ret < 0) + return -ENOMEM; - atomic_set(&task->task_timeout, 1); - task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT; - task->task_scsi_status = 1; + if (tm_type == TMR_ABORT_TASK) + se_cmd->se_tmr_req->ref_task_tag = tag; - if (atomic_read(&task->task_stop)) { - DEBUG_TT("transport task: %p cmd: %p timeout task_stop" - " == 1\n", task, cmd); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - complete(&task->task_stop_comp); - return; + /* See target_submit_cmd for commentary */ + ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); + if (ret) { + core_tmr_release_req(se_cmd->se_tmr_req); + return ret; } - if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_left))) { - DEBUG_TT("transport task: %p cmd: %p timeout non zero" - " t_task_cdbs_left\n", task, cmd); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - return; + ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun); + if (ret) { + /* + * For callback during failure handling, push this work off + * to process context with TMR_LUN_DOES_NOT_EXIST status. + */ + INIT_WORK(&se_cmd->work, target_complete_tmr_failure); + schedule_work(&se_cmd->work); + return 0; } - DEBUG_TT("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n", - task, cmd); - - cmd->t_state = TRANSPORT_COMPLETE_FAILURE; - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - - transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE); -} - -/* - * Called with T_TASK(cmd)->t_state_lock held. - */ -static void transport_start_task_timer(struct se_task *task) -{ - struct se_device *dev = task->se_dev; - int timeout; - - if (task->task_flags & TF_RUNNING) - return; - /* - * If the task_timeout is disabled, exit now. - */ - timeout = DEV_ATTRIB(dev)->task_timeout; - if (!(timeout)) - return; - - init_timer(&task->task_timer); - task->task_timer.expires = (get_jiffies_64() + timeout * HZ); - task->task_timer.data = (unsigned long) task; - task->task_timer.function = transport_task_timeout_handler; - - task->task_flags |= TF_RUNNING; - add_timer(&task->task_timer); -#if 0 - printk(KERN_INFO "Starting task timer for cmd: %p task: %p seconds:" - " %d\n", task->task_se_cmd, task, timeout); -#endif + transport_generic_handle_tmr(se_cmd); + return 0; } +EXPORT_SYMBOL(target_submit_tmr); /* - * Called with spin_lock_irq(&T_TASK(cmd)->t_state_lock) held. + * If the cmd is active, request it to be stopped and sleep until it + * has completed. */ -void __transport_stop_task_timer(struct se_task *task, unsigned long *flags) +bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags) { - struct se_cmd *cmd = TASK_CMD(task); - - if (!(task->task_flags & TF_RUNNING)) - return; - - task->task_flags |= TF_STOP; - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, *flags); - - del_timer_sync(&task->task_timer); - - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, *flags); - task->task_flags &= ~TF_RUNNING; - task->task_flags &= ~TF_STOP; -} + bool was_active = false; -static void transport_stop_all_task_timers(struct se_cmd *cmd) -{ - struct se_task *task = NULL, *task_tmp; - unsigned long flags; + if (cmd->transport_state & CMD_T_BUSY) { + cmd->transport_state |= CMD_T_REQUEST_STOP; + spin_unlock_irqrestore(&cmd->t_state_lock, *flags); - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - list_for_each_entry_safe(task, task_tmp, - &T_TASK(cmd)->t_task_list, t_list) - __transport_stop_task_timer(task, &flags); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); -} + pr_debug("cmd %p waiting to complete\n", cmd); + wait_for_completion(&cmd->task_stop_comp); + pr_debug("cmd %p stopped successfully\n", cmd); -static inline int transport_tcq_window_closed(struct se_device *dev) -{ - if (dev->dev_tcq_window_closed++ < - PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) { - msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT); - } else - msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG); + spin_lock_irqsave(&cmd->t_state_lock, *flags); + cmd->transport_state &= ~CMD_T_REQUEST_STOP; + cmd->transport_state &= ~CMD_T_BUSY; + was_active = true; + } - wake_up_interruptible(&dev->dev_queue_obj->thread_wq); - return 0; + return was_active; } /* - * Called from Fabric Module context from transport_execute_tasks() - * - * The return of this function determins if the tasks from struct se_cmd - * get added to the execution queue in transport_execute_tasks(), - * or are added to the delayed or ordered lists here. + * Handle SAM-esque emulation for generic transport request failures. */ -static inline int transport_execute_task_attr(struct se_cmd *cmd) +void transport_generic_request_failure(struct se_cmd *cmd, + sense_reason_t sense_reason) { - if (SE_DEV(cmd)->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) - return 1; + int ret = 0; + + pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" + " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd), + cmd->t_task_cdb[0]); + pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n", + cmd->se_tfo->get_cmd_state(cmd), + cmd->t_state, sense_reason); + pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n", + (cmd->transport_state & CMD_T_ACTIVE) != 0, + (cmd->transport_state & CMD_T_STOP) != 0, + (cmd->transport_state & CMD_T_SENT) != 0); + /* - * Check for the existance of HEAD_OF_QUEUE, and if true return 1 - * to allow the passed struct se_cmd list of tasks to the front of the list. + * For SAM Task Attribute emulation for failed struct se_cmd */ - if (cmd->sam_task_attr == TASK_ATTR_HOQ) { - atomic_inc(&SE_DEV(cmd)->dev_hoq_count); - smp_mb__after_atomic_inc(); - DEBUG_STA("Added HEAD_OF_QUEUE for CDB:" - " 0x%02x, se_ordered_id: %u\n", - T_TASK(cmd)->t_task_cdb[0], - cmd->se_ordered_id); - return 1; - } else if (cmd->sam_task_attr == TASK_ATTR_ORDERED) { - spin_lock(&SE_DEV(cmd)->ordered_cmd_lock); - list_add_tail(&cmd->se_ordered_list, - &SE_DEV(cmd)->ordered_cmd_list); - spin_unlock(&SE_DEV(cmd)->ordered_cmd_lock); - - atomic_inc(&SE_DEV(cmd)->dev_ordered_sync); - smp_mb__after_atomic_inc(); - - DEBUG_STA("Added ORDERED for CDB: 0x%02x to ordered" - " list, se_ordered_id: %u\n", - T_TASK(cmd)->t_task_cdb[0], - cmd->se_ordered_id); - /* - * Add ORDERED command to tail of execution queue if - * no other older commands exist that need to be - * completed first. - */ - if (!(atomic_read(&SE_DEV(cmd)->simple_cmds))) - return 1; - } else { - /* - * For SIMPLE and UNTAGGED Task Attribute commands - */ - atomic_inc(&SE_DEV(cmd)->simple_cmds); - smp_mb__after_atomic_inc(); - } + transport_complete_task_attr(cmd); /* - * Otherwise if one or more outstanding ORDERED task attribute exist, - * add the dormant task(s) built for the passed struct se_cmd to the - * execution queue and become in Active state for this struct se_device. + * Handle special case for COMPARE_AND_WRITE failure, where the + * callback is expected to drop the per device ->caw_mutex. */ - if (atomic_read(&SE_DEV(cmd)->dev_ordered_sync) != 0) { + if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && + cmd->transport_complete_callback) + cmd->transport_complete_callback(cmd); + + switch (sense_reason) { + case TCM_NON_EXISTENT_LUN: + case TCM_UNSUPPORTED_SCSI_OPCODE: + case TCM_INVALID_CDB_FIELD: + case TCM_INVALID_PARAMETER_LIST: + case TCM_PARAMETER_LIST_LENGTH_ERROR: + case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: + case TCM_UNKNOWN_MODE_PAGE: + case TCM_WRITE_PROTECTED: + case TCM_ADDRESS_OUT_OF_RANGE: + case TCM_CHECK_CONDITION_ABORT_CMD: + case TCM_CHECK_CONDITION_UNIT_ATTENTION: + case TCM_CHECK_CONDITION_NOT_READY: + case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED: + case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED: + case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED: + break; + case TCM_OUT_OF_RESOURCES: + sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + break; + case TCM_RESERVATION_CONFLICT: /* - * Otherwise, add cmd w/ tasks to delayed cmd queue that - * will be drained upon competion of HEAD_OF_QUEUE task. + * No SENSE Data payload for this case, set SCSI Status + * and queue the response to $FABRIC_MOD. + * + * Uses linux/include/scsi/scsi.h SAM status codes defs */ - spin_lock(&SE_DEV(cmd)->delayed_cmd_lock); - cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR; - list_add_tail(&cmd->se_delayed_list, - &SE_DEV(cmd)->delayed_cmd_list); - spin_unlock(&SE_DEV(cmd)->delayed_cmd_lock); - - DEBUG_STA("Added CDB: 0x%02x Task Attr: 0x%02x to" - " delayed CMD list, se_ordered_id: %u\n", - T_TASK(cmd)->t_task_cdb[0], cmd->sam_task_attr, - cmd->se_ordered_id); + cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; /* - * Return zero to let transport_execute_tasks() know - * not to add the delayed tasks to the execution list. + * For UA Interlock Code 11b, a RESERVATION CONFLICT will + * establish a UNIT ATTENTION with PREVIOUS RESERVATION + * CONFLICT STATUS. + * + * See spc4r17, section 7.4.6 Control Mode Page, Table 349 */ - return 0; + if (cmd->se_sess && + cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) + core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, + cmd->orig_fe_lun, 0x2C, + ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); + + trace_target_cmd_complete(cmd); + ret = cmd->se_tfo-> queue_status(cmd); + if (ret == -EAGAIN || ret == -ENOMEM) + goto queue_full; + goto check_stop; + default: + pr_err("Unknown transport error for CDB 0x%02x: %d\n", + cmd->t_task_cdb[0], sense_reason); + sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; + break; } - /* - * Otherwise, no ORDERED task attributes exist.. - */ - return 1; + + ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0); + if (ret == -EAGAIN || ret == -ENOMEM) + goto queue_full; + +check_stop: + transport_lun_remove_cmd(cmd); + if (!transport_cmd_check_stop_to_fabric(cmd)) + ; + return; + +queue_full: + cmd->t_state = TRANSPORT_COMPLETE_QF_OK; + transport_handle_queue_full(cmd, cmd->se_dev); } +EXPORT_SYMBOL(transport_generic_request_failure); -/* - * Called from fabric module context in transport_generic_new_cmd() and - * transport_generic_process_write() - */ -static int transport_execute_tasks(struct se_cmd *cmd) +void __target_execute_cmd(struct se_cmd *cmd) { - int add_tasks; + sense_reason_t ret; - if (!(cmd->se_cmd_flags & SCF_SE_DISABLE_ONLINE_CHECK)) { - if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) { - cmd->transport_error_status = - PYX_TRANSPORT_LU_COMM_FAILURE; - transport_generic_request_failure(cmd, NULL, 0, 1); - return 0; + if (cmd->execute_cmd) { + ret = cmd->execute_cmd(cmd); + if (ret) { + spin_lock_irq(&cmd->t_state_lock); + cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT); + spin_unlock_irq(&cmd->t_state_lock); + + transport_generic_request_failure(cmd, ret); } } - /* - * Call transport_cmd_check_stop() to see if a fabric exception - * has occured that prevents execution. - */ - if (!(transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING))) { - /* - * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE - * attribute for the tasks of the received struct se_cmd CDB - */ - add_tasks = transport_execute_task_attr(cmd); - if (add_tasks == 0) - goto execute_tasks; - /* - * This calls transport_add_tasks_from_cmd() to handle - * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation - * (if enabled) in __transport_add_task_to_execute_queue() and - * transport_add_task_check_sam_attr(). - */ - transport_add_tasks_from_cmd(cmd); - } - /* - * Kick the execution queue for the cmd associated struct se_device - * storage object. - */ -execute_tasks: - __transport_execute_tasks(SE_DEV(cmd)); - return 0; } -/* - * Called to check struct se_device tcq depth window, and once open pull struct se_task - * from struct se_device->execute_task_list and - * - * Called from transport_processing_thread() - */ -static int __transport_execute_tasks(struct se_device *dev) +static bool target_handle_task_attr(struct se_cmd *cmd) { - int error; - struct se_cmd *cmd = NULL; - struct se_task *task; - unsigned long flags; + struct se_device *dev = cmd->se_dev; + + if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) + return false; /* - * Check if there is enough room in the device and HBA queue to send - * struct se_transport_task's to the selected transport. + * Check for the existence of HEAD_OF_QUEUE, and if true return 1 + * to allow the passed struct se_cmd list of tasks to the front of the list. */ -check_depth: - spin_lock_irqsave(&SE_HBA(dev)->hba_queue_lock, flags); - if (!(atomic_read(&dev->depth_left)) || - !(atomic_read(&SE_HBA(dev)->left_queue_depth))) { - spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags); - return transport_tcq_window_closed(dev); - } - dev->dev_tcq_window_closed = 0; - - spin_lock(&dev->execute_task_lock); - task = transport_get_task_from_execute_queue(dev); - spin_unlock(&dev->execute_task_lock); - - if (!task) { - spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags); - return 0; - } - - atomic_dec(&dev->depth_left); - atomic_dec(&SE_HBA(dev)->left_queue_depth); - spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags); - - cmd = TASK_CMD(task); + switch (cmd->sam_task_attr) { + case MSG_HEAD_TAG: + pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, " + "se_ordered_id: %u\n", + cmd->t_task_cdb[0], cmd->se_ordered_id); + return false; + case MSG_ORDERED_TAG: + atomic_inc(&dev->dev_ordered_sync); + smp_mb__after_atomic(); - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - atomic_set(&task->task_active, 1); - atomic_set(&task->task_sent, 1); - atomic_inc(&T_TASK(cmd)->t_task_cdbs_sent); + pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, " + " se_ordered_id: %u\n", + cmd->t_task_cdb[0], cmd->se_ordered_id); - if (atomic_read(&T_TASK(cmd)->t_task_cdbs_sent) == - T_TASK(cmd)->t_task_cdbs) - atomic_set(&cmd->transport_sent, 1); - - transport_start_task_timer(task); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - /* - * The struct se_cmd->transport_emulate_cdb() function pointer is used - * to grab REPORT_LUNS CDBs before they hit the - * struct se_subsystem_api->do_task() caller below. - */ - if (cmd->transport_emulate_cdb) { - error = cmd->transport_emulate_cdb(cmd); - if (error != 0) { - cmd->transport_error_status = error; - atomic_set(&task->task_active, 0); - atomic_set(&cmd->transport_sent, 0); - transport_stop_tasks_for_cmd(cmd); - transport_generic_request_failure(cmd, dev, 0, 1); - goto check_depth; - } /* - * Handle the successful completion for transport_emulate_cdb() - * for synchronous operation, following SCF_EMULATE_CDB_ASYNC - * Otherwise the caller is expected to complete the task with - * proper status. + * Execute an ORDERED command if no other older commands + * exist that need to be completed first. */ - if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) { - cmd->scsi_status = SAM_STAT_GOOD; - task->task_scsi_status = GOOD; - transport_complete_task(task, 1); - } - } else { + if (!atomic_read(&dev->simple_cmds)) + return false; + break; + default: /* - * Currently for all virtual TCM plugins including IBLOCK, FILEIO and - * RAMDISK we use the internal transport_emulate_control_cdb() logic - * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK - * LUN emulation code. - * - * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we - * call ->do_task() directly and let the underlying TCM subsystem plugin - * code handle the CDB emulation. + * For SIMPLE and UNTAGGED Task Attribute commands */ - if ((TRANSPORT(dev)->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) && - (!(TASK_CMD(task)->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB))) - error = transport_emulate_control_cdb(task); - else - error = TRANSPORT(dev)->do_task(task); - - if (error != 0) { - cmd->transport_error_status = error; - atomic_set(&task->task_active, 0); - atomic_set(&cmd->transport_sent, 0); - transport_stop_tasks_for_cmd(cmd); - transport_generic_request_failure(cmd, dev, 0, 1); - } + atomic_inc(&dev->simple_cmds); + smp_mb__after_atomic(); + break; } - goto check_depth; + if (atomic_read(&dev->dev_ordered_sync) == 0) + return false; - return 0; -} - -void transport_new_cmd_failure(struct se_cmd *se_cmd) -{ - unsigned long flags; - /* - * Any unsolicited data will get dumped for failed command inside of - * the fabric plugin - */ - spin_lock_irqsave(&T_TASK(se_cmd)->t_state_lock, flags); - se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED; - se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; - spin_unlock_irqrestore(&T_TASK(se_cmd)->t_state_lock, flags); + spin_lock(&dev->delayed_cmd_lock); + list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list); + spin_unlock(&dev->delayed_cmd_lock); - CMD_TFO(se_cmd)->new_cmd_failure(se_cmd); + pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" + " delayed CMD list, se_ordered_id: %u\n", + cmd->t_task_cdb[0], cmd->sam_task_attr, + cmd->se_ordered_id); + return true; } -static void transport_nop_wait_for_tasks(struct se_cmd *, int, int); - -static inline u32 transport_get_sectors_6( - unsigned char *cdb, - struct se_cmd *cmd, - int *ret) +void target_execute_cmd(struct se_cmd *cmd) { - struct se_device *dev = SE_LUN(cmd)->lun_se_dev; - /* - * Assume TYPE_DISK for non struct se_device objects. - * Use 8-bit sector value. + * If the received CDB has aleady been aborted stop processing it here. */ - if (!dev) - goto type_disk; - - /* - * Use 24-bit allocation length for TYPE_TAPE. - */ - if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) - return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4]; - - /* - * Everything else assume TYPE_DISK Sector CDB location. - * Use 8-bit sector value. - */ -type_disk: - return (u32)cdb[4]; -} - -static inline u32 transport_get_sectors_10( - unsigned char *cdb, - struct se_cmd *cmd, - int *ret) -{ - struct se_device *dev = SE_LUN(cmd)->lun_se_dev; + if (transport_check_aborted_status(cmd, 1)) + return; /* - * Assume TYPE_DISK for non struct se_device objects. - * Use 16-bit sector value. + * Determine if frontend context caller is requesting the stopping of + * this command for frontend exceptions. */ - if (!dev) - goto type_disk; + spin_lock_irq(&cmd->t_state_lock); + if (cmd->transport_state & CMD_T_STOP) { + pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", + __func__, __LINE__, + cmd->se_tfo->get_task_tag(cmd)); - /* - * XXX_10 is not defined in SSC, throw an exception - */ - if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) { - *ret = -1; - return 0; + spin_unlock_irq(&cmd->t_state_lock); + complete_all(&cmd->t_transport_stop_comp); + return; } + cmd->t_state = TRANSPORT_PROCESSING; + cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; + spin_unlock_irq(&cmd->t_state_lock); /* - * Everything else assume TYPE_DISK Sector CDB location. - * Use 16-bit sector value. + * Perform WRITE_INSERT of PI using software emulation when backend + * device has PI enabled, if the transport has not already generated + * PI using hardware WRITE_INSERT offload. */ -type_disk: - return (u32)(cdb[7] << 8) + cdb[8]; -} - -static inline u32 transport_get_sectors_12( - unsigned char *cdb, - struct se_cmd *cmd, - int *ret) -{ - struct se_device *dev = SE_LUN(cmd)->lun_se_dev; - - /* - * Assume TYPE_DISK for non struct se_device objects. - * Use 32-bit sector value. - */ - if (!dev) - goto type_disk; - - /* - * XXX_12 is not defined in SSC, throw an exception - */ - if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) { - *ret = -1; - return 0; + if (cmd->prot_op == TARGET_PROT_DOUT_INSERT) { + if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT)) + sbc_dif_generate(cmd); } - /* - * Everything else assume TYPE_DISK Sector CDB location. - * Use 32-bit sector value. - */ -type_disk: - return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; -} - -static inline u32 transport_get_sectors_16( - unsigned char *cdb, - struct se_cmd *cmd, - int *ret) -{ - struct se_device *dev = SE_LUN(cmd)->lun_se_dev; - - /* - * Assume TYPE_DISK for non struct se_device objects. - * Use 32-bit sector value. - */ - if (!dev) - goto type_disk; - - /* - * Use 24-bit allocation length for TYPE_TAPE. - */ - if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) - return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14]; + if (target_handle_task_attr(cmd)) { + spin_lock_irq(&cmd->t_state_lock); + cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT; + spin_unlock_irq(&cmd->t_state_lock); + return; + } -type_disk: - return (u32)(cdb[10] << 24) + (cdb[11] << 16) + - (cdb[12] << 8) + cdb[13]; + __target_execute_cmd(cmd); } +EXPORT_SYMBOL(target_execute_cmd); /* - * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants + * Process all commands up to the last received ORDERED task attribute which + * requires another blocking boundary */ -static inline u32 transport_get_sectors_32( - unsigned char *cdb, - struct se_cmd *cmd, - int *ret) +static void target_restart_delayed_cmds(struct se_device *dev) { - /* - * Assume TYPE_DISK for non struct se_device objects. - * Use 32-bit sector value. - */ - return (u32)(cdb[28] << 24) + (cdb[29] << 16) + - (cdb[30] << 8) + cdb[31]; + for (;;) { + struct se_cmd *cmd; -} - -static inline u32 transport_get_size( - u32 sectors, - unsigned char *cdb, - struct se_cmd *cmd) -{ - struct se_device *dev = SE_DEV(cmd); - - if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) { - if (cdb[1] & 1) { /* sectors */ - return DEV_ATTRIB(dev)->block_size * sectors; - } else /* bytes */ - return sectors; - } -#if 0 - printk(KERN_INFO "Returning block_size: %u, sectors: %u == %u for" - " %s object\n", DEV_ATTRIB(dev)->block_size, sectors, - DEV_ATTRIB(dev)->block_size * sectors, - TRANSPORT(dev)->name); -#endif - return DEV_ATTRIB(dev)->block_size * sectors; -} - -unsigned char transport_asciihex_to_binaryhex(unsigned char val[2]) -{ - unsigned char result = 0; - /* - * MSB - */ - if ((val[0] >= 'a') && (val[0] <= 'f')) - result = ((val[0] - 'a' + 10) & 0xf) << 4; - else - if ((val[0] >= 'A') && (val[0] <= 'F')) - result = ((val[0] - 'A' + 10) & 0xf) << 4; - else /* digit */ - result = ((val[0] - '0') & 0xf) << 4; - /* - * LSB - */ - if ((val[1] >= 'a') && (val[1] <= 'f')) - result |= ((val[1] - 'a' + 10) & 0xf); - else - if ((val[1] >= 'A') && (val[1] <= 'F')) - result |= ((val[1] - 'A' + 10) & 0xf); - else /* digit */ - result |= ((val[1] - '0') & 0xf); - - return result; -} -EXPORT_SYMBOL(transport_asciihex_to_binaryhex); - -static void transport_xor_callback(struct se_cmd *cmd) -{ - unsigned char *buf, *addr; - struct se_mem *se_mem; - unsigned int offset; - int i; - /* - * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command - * - * 1) read the specified logical block(s); - * 2) transfer logical blocks from the data-out buffer; - * 3) XOR the logical blocks transferred from the data-out buffer with - * the logical blocks read, storing the resulting XOR data in a buffer; - * 4) if the DISABLE WRITE bit is set to zero, then write the logical - * blocks transferred from the data-out buffer; and - * 5) transfer the resulting XOR data to the data-in buffer. - */ - buf = kmalloc(cmd->data_length, GFP_KERNEL); - if (!(buf)) { - printk(KERN_ERR "Unable to allocate xor_callback buf\n"); - return; - } - /* - * Copy the scatterlist WRITE buffer located at T_TASK(cmd)->t_mem_list - * into the locally allocated *buf - */ - transport_memcpy_se_mem_read_contig(cmd, buf, T_TASK(cmd)->t_mem_list); - /* - * Now perform the XOR against the BIDI read memory located at - * T_TASK(cmd)->t_mem_bidi_list - */ + spin_lock(&dev->delayed_cmd_lock); + if (list_empty(&dev->delayed_cmd_list)) { + spin_unlock(&dev->delayed_cmd_lock); + break; + } - offset = 0; - list_for_each_entry(se_mem, T_TASK(cmd)->t_mem_bidi_list, se_list) { - addr = (unsigned char *)kmap_atomic(se_mem->se_page, KM_USER0); - if (!(addr)) - goto out; + cmd = list_entry(dev->delayed_cmd_list.next, + struct se_cmd, se_delayed_node); + list_del(&cmd->se_delayed_node); + spin_unlock(&dev->delayed_cmd_lock); - for (i = 0; i < se_mem->se_len; i++) - *(addr + se_mem->se_off + i) ^= *(buf + offset + i); + __target_execute_cmd(cmd); - offset += se_mem->se_len; - kunmap_atomic(addr, KM_USER0); + if (cmd->sam_task_attr == MSG_ORDERED_TAG) + break; } -out: - kfree(buf); } /* - * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd + * Called from I/O completion to determine which dormant/delayed + * and ordered cmds need to have their tasks added to the execution queue. */ -static int transport_get_sense_data(struct se_cmd *cmd) +static void transport_complete_task_attr(struct se_cmd *cmd) { - unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL; - struct se_device *dev; - struct se_task *task = NULL, *task_tmp; - unsigned long flags; - u32 offset = 0; - - if (!SE_LUN(cmd)) { - printk(KERN_ERR "SE_LUN(cmd) is NULL\n"); - return -1; - } - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - return 0; - } - - list_for_each_entry_safe(task, task_tmp, - &T_TASK(cmd)->t_task_list, t_list) { - - if (!task->task_sense) - continue; + struct se_device *dev = cmd->se_dev; - dev = task->se_dev; - if (!(dev)) - continue; + if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) + return; - if (!TRANSPORT(dev)->get_sense_buffer) { - printk(KERN_ERR "TRANSPORT(dev)->get_sense_buffer" - " is NULL\n"); - continue; - } + if (cmd->sam_task_attr == MSG_SIMPLE_TAG) { + atomic_dec(&dev->simple_cmds); + smp_mb__after_atomic(); + dev->dev_cur_ordered_id++; + pr_debug("Incremented dev->dev_cur_ordered_id: %u for" + " SIMPLE: %u\n", dev->dev_cur_ordered_id, + cmd->se_ordered_id); + } else if (cmd->sam_task_attr == MSG_HEAD_TAG) { + dev->dev_cur_ordered_id++; + pr_debug("Incremented dev_cur_ordered_id: %u for" + " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, + cmd->se_ordered_id); + } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { + atomic_dec(&dev->dev_ordered_sync); + smp_mb__after_atomic(); - sense_buffer = TRANSPORT(dev)->get_sense_buffer(task); - if (!(sense_buffer)) { - printk(KERN_ERR "ITT[0x%08x]_TASK[%d]: Unable to locate" - " sense buffer for task with sense\n", - CMD_TFO(cmd)->get_task_tag(cmd), task->task_no); - continue; - } - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - - offset = CMD_TFO(cmd)->set_fabric_sense_len(cmd, - TRANSPORT_SENSE_BUFFER); - - memcpy((void *)&buffer[offset], (void *)sense_buffer, - TRANSPORT_SENSE_BUFFER); - cmd->scsi_status = task->task_scsi_status; - /* Automatically padded */ - cmd->scsi_sense_length = - (TRANSPORT_SENSE_BUFFER + offset); - - printk(KERN_INFO "HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x" - " and sense\n", - dev->se_hba->hba_id, TRANSPORT(dev)->name, - cmd->scsi_status); - return 0; + dev->dev_cur_ordered_id++; + pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" + " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); } - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - return -1; + target_restart_delayed_cmds(dev); } -static int transport_allocate_resources(struct se_cmd *cmd) +static void transport_complete_qf(struct se_cmd *cmd) { - u32 length = cmd->data_length; - - if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) || - (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) - return transport_generic_get_mem(cmd, length, PAGE_SIZE); - else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) - return transport_generic_allocate_buf(cmd, length); - else - return 0; -} + int ret = 0; -static int -transport_handle_reservation_conflict(struct se_cmd *cmd) -{ - cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks; - cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; - cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT; - cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; - /* - * For UA Interlock Code 11b, a RESERVATION CONFLICT will - * establish a UNIT ATTENTION with PREVIOUS RESERVATION - * CONFLICT STATUS. - * - * See spc4r17, section 7.4.6 Control Mode Page, Table 349 - */ - if (SE_SESS(cmd) && - DEV_ATTRIB(cmd->se_dev)->emulate_ua_intlck_ctrl == 2) - core_scsi3_ua_allocate(SE_SESS(cmd)->se_node_acl, - cmd->orig_fe_lun, 0x2C, - ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); - return -2; -} + transport_complete_task_attr(cmd); -/* transport_generic_cmd_sequencer(): - * - * Generic Command Sequencer that should work for most DAS transport - * drivers. - * - * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD - * RX Thread. - * - * FIXME: Need to support other SCSI OPCODES where as well. - */ -static int transport_generic_cmd_sequencer( - struct se_cmd *cmd, - unsigned char *cdb) -{ - struct se_device *dev = SE_DEV(cmd); - struct se_subsystem_dev *su_dev = dev->se_sub_dev; - int ret = 0, sector_ret = 0, passthrough; - u32 sectors = 0, size = 0, pr_reg_type = 0; - u16 service_action; - u8 alua_ascq = 0; - /* - * Check for an existing UNIT ATTENTION condition - */ - if (core_scsi3_ua_check(cmd, cdb) < 0) { - cmd->transport_wait_for_tasks = - &transport_nop_wait_for_tasks; - cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; - cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION; - return -2; - } - /* - * Check status of Asymmetric Logical Unit Assignment port - */ - ret = T10_ALUA(su_dev)->alua_state_check(cmd, cdb, &alua_ascq); - if (ret != 0) { - cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks; - /* - * Set SCSI additional sense code (ASC) to 'LUN Not Accessable'; - * The ALUA additional sense code qualifier (ASCQ) is determined - * by the ALUA primary or secondary access state.. - */ - if (ret > 0) { -#if 0 - printk(KERN_INFO "[%s]: ALUA TG Port not available," - " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n", - CMD_TFO(cmd)->get_fabric_name(), alua_ascq); -#endif - transport_set_sense_codes(cmd, 0x04, alua_ascq); - cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; - cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY; - return -2; - } - goto out_invalid_cdb_field; - } - /* - * Check status for SPC-3 Persistent Reservations - */ - if (T10_PR_OPS(su_dev)->t10_reservation_check(cmd, &pr_reg_type) != 0) { - if (T10_PR_OPS(su_dev)->t10_seq_non_holder( - cmd, cdb, pr_reg_type) != 0) - return transport_handle_reservation_conflict(cmd); - /* - * This means the CDB is allowed for the SCSI Initiator port - * when said port is *NOT* holding the legacy SPC-2 or - * SPC-3 Persistent Reservation. - */ + if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { + trace_target_cmd_complete(cmd); + ret = cmd->se_tfo->queue_status(cmd); + if (ret) + goto out; } - switch (cdb[0]) { - case READ_6: - sectors = transport_get_sectors_6(cdb, cmd, §or_ret); - if (sector_ret) - goto out_unsupported_cdb; - size = transport_get_size(sectors, cdb, cmd); - cmd->transport_split_cdb = &split_cdb_XX_6; - T_TASK(cmd)->t_task_lba = transport_lba_21(cdb); - cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; - break; - case READ_10: - sectors = transport_get_sectors_10(cdb, cmd, §or_ret); - if (sector_ret) - goto out_unsupported_cdb; - size = transport_get_size(sectors, cdb, cmd); - cmd->transport_split_cdb = &split_cdb_XX_10; - T_TASK(cmd)->t_task_lba = transport_lba_32(cdb); - cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; - break; - case READ_12: - sectors = transport_get_sectors_12(cdb, cmd, §or_ret); - if (sector_ret) - goto out_unsupported_cdb; - size = transport_get_size(sectors, cdb, cmd); - cmd->transport_split_cdb = &split_cdb_XX_12; - T_TASK(cmd)->t_task_lba = transport_lba_32(cdb); - cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; - break; - case READ_16: - sectors = transport_get_sectors_16(cdb, cmd, §or_ret); - if (sector_ret) - goto out_unsupported_cdb; - size = transport_get_size(sectors, cdb, cmd); - cmd->transport_split_cdb = &split_cdb_XX_16; - T_TASK(cmd)->t_task_lba = transport_lba_64(cdb); - cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; - break; - case WRITE_6: - sectors = transport_get_sectors_6(cdb, cmd, §or_ret); - if (sector_ret) - goto out_unsupported_cdb; - size = transport_get_size(sectors, cdb, cmd); - cmd->transport_split_cdb = &split_cdb_XX_6; - T_TASK(cmd)->t_task_lba = transport_lba_21(cdb); - cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; - break; - case WRITE_10: - sectors = transport_get_sectors_10(cdb, cmd, §or_ret); - if (sector_ret) - goto out_unsupported_cdb; - size = transport_get_size(sectors, cdb, cmd); - cmd->transport_split_cdb = &split_cdb_XX_10; - T_TASK(cmd)->t_task_lba = transport_lba_32(cdb); - T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8); - cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; - break; - case WRITE_12: - sectors = transport_get_sectors_12(cdb, cmd, §or_ret); - if (sector_ret) - goto out_unsupported_cdb; - size = transport_get_size(sectors, cdb, cmd); - cmd->transport_split_cdb = &split_cdb_XX_12; - T_TASK(cmd)->t_task_lba = transport_lba_32(cdb); - T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8); - cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; - break; - case WRITE_16: - sectors = transport_get_sectors_16(cdb, cmd, §or_ret); - if (sector_ret) - goto out_unsupported_cdb; - size = transport_get_size(sectors, cdb, cmd); - cmd->transport_split_cdb = &split_cdb_XX_16; - T_TASK(cmd)->t_task_lba = transport_lba_64(cdb); - T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8); - cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; - break; - case XDWRITEREAD_10: - if ((cmd->data_direction != DMA_TO_DEVICE) || - !(T_TASK(cmd)->t_tasks_bidi)) - goto out_invalid_cdb_field; - sectors = transport_get_sectors_10(cdb, cmd, §or_ret); - if (sector_ret) - goto out_unsupported_cdb; - size = transport_get_size(sectors, cdb, cmd); - cmd->transport_split_cdb = &split_cdb_XX_10; - T_TASK(cmd)->t_task_lba = transport_lba_32(cdb); - cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; - passthrough = (TRANSPORT(dev)->transport_type == - TRANSPORT_PLUGIN_PHBA_PDEV); - /* - * Skip the remaining assignments for TCM/PSCSI passthrough - */ - if (passthrough) - break; - /* - * Setup BIDI XOR callback to be run during transport_generic_complete_ok() - */ - cmd->transport_complete_callback = &transport_xor_callback; - T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8); + switch (cmd->data_direction) { + case DMA_FROM_DEVICE: + trace_target_cmd_complete(cmd); + ret = cmd->se_tfo->queue_data_in(cmd); break; - case VARIABLE_LENGTH_CMD: - service_action = get_unaligned_be16(&cdb[8]); - /* - * Determine if this is TCM/PSCSI device and we should disable - * internal emulation for this CDB. - */ - passthrough = (TRANSPORT(dev)->transport_type == - TRANSPORT_PLUGIN_PHBA_PDEV); - - switch (service_action) { - case XDWRITEREAD_32: - sectors = transport_get_sectors_32(cdb, cmd, §or_ret); - if (sector_ret) - goto out_unsupported_cdb; - size = transport_get_size(sectors, cdb, cmd); - /* - * Use WRITE_32 and READ_32 opcodes for the emulated - * XDWRITE_READ_32 logic. - */ - cmd->transport_split_cdb = &split_cdb_XX_32; - T_TASK(cmd)->t_task_lba = transport_lba_64_ext(cdb); - cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; - - /* - * Skip the remaining assignments for TCM/PSCSI passthrough - */ - if (passthrough) - break; - - /* - * Setup BIDI XOR callback to be run during - * transport_generic_complete_ok() - */ - cmd->transport_complete_callback = &transport_xor_callback; - T_TASK(cmd)->t_tasks_fua = (cdb[10] & 0x8); - break; - case WRITE_SAME_32: - sectors = transport_get_sectors_32(cdb, cmd, §or_ret); - if (sector_ret) - goto out_unsupported_cdb; - size = transport_get_size(sectors, cdb, cmd); - T_TASK(cmd)->t_task_lba = get_unaligned_be64(&cdb[12]); - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; - - /* - * Skip the remaining assignments for TCM/PSCSI passthrough - */ - if (passthrough) + case DMA_TO_DEVICE: + if (cmd->se_cmd_flags & SCF_BIDI) { + ret = cmd->se_tfo->queue_data_in(cmd); + if (ret < 0) break; - - if ((cdb[10] & 0x04) || (cdb[10] & 0x02)) { - printk(KERN_ERR "WRITE_SAME PBDATA and LBDATA" - " bits not supported for Block Discard" - " Emulation\n"); - goto out_invalid_cdb_field; - } - /* - * Currently for the emulated case we only accept - * tpws with the UNMAP=1 bit set. - */ - if (!(cdb[10] & 0x08)) { - printk(KERN_ERR "WRITE_SAME w/o UNMAP bit not" - " supported for Block Discard Emulation\n"); - goto out_invalid_cdb_field; - } - break; - default: - printk(KERN_ERR "VARIABLE_LENGTH_CMD service action" - " 0x%04x not supported\n", service_action); - goto out_unsupported_cdb; - } - break; - case 0xa3: - if (TRANSPORT(dev)->get_device_type(dev) != TYPE_ROM) { - /* MAINTENANCE_IN from SCC-2 */ - /* - * Check for emulated MI_REPORT_TARGET_PGS. - */ - if (cdb[1] == MI_REPORT_TARGET_PGS) { - cmd->transport_emulate_cdb = - (T10_ALUA(su_dev)->alua_type == - SPC3_ALUA_EMULATED) ? - &core_emulate_report_target_port_groups : - NULL; - } - size = (cdb[6] << 24) | (cdb[7] << 16) | - (cdb[8] << 8) | cdb[9]; - } else { - /* GPCMD_SEND_KEY from multi media commands */ - size = (cdb[8] << 8) + cdb[9]; } - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; - case MODE_SELECT: - size = cdb[4]; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; - break; - case MODE_SELECT_10: - size = (cdb[7] << 8) + cdb[8]; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; - break; - case MODE_SENSE: - size = cdb[4]; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; - case MODE_SENSE_10: - case GPCMD_READ_BUFFER_CAPACITY: - case GPCMD_SEND_OPC: - case LOG_SELECT: - case LOG_SENSE: - size = (cdb[7] << 8) + cdb[8]; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; - case READ_BLOCK_LIMITS: - size = READ_BLOCK_LEN; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; - case GPCMD_GET_CONFIGURATION: - case GPCMD_READ_FORMAT_CAPACITIES: - case GPCMD_READ_DISC_INFO: - case GPCMD_READ_TRACK_RZONE_INFO: - size = (cdb[7] << 8) + cdb[8]; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; - break; - case PERSISTENT_RESERVE_IN: - case PERSISTENT_RESERVE_OUT: - cmd->transport_emulate_cdb = - (T10_RES(su_dev)->res_type == - SPC3_PERSISTENT_RESERVATIONS) ? - &core_scsi3_emulate_pr : NULL; - size = (cdb[7] << 8) + cdb[8]; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; - case GPCMD_MECHANISM_STATUS: - case GPCMD_READ_DVD_STRUCTURE: - size = (cdb[8] << 8) + cdb[9]; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; - break; - case READ_POSITION: - size = READ_POSITION_LEN; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; - case 0xa4: - if (TRANSPORT(dev)->get_device_type(dev) != TYPE_ROM) { - /* MAINTENANCE_OUT from SCC-2 - * - * Check for emulated MO_SET_TARGET_PGS. - */ - if (cdb[1] == MO_SET_TARGET_PGS) { - cmd->transport_emulate_cdb = - (T10_ALUA(su_dev)->alua_type == - SPC3_ALUA_EMULATED) ? - &core_emulate_set_target_port_groups : - NULL; - } - - size = (cdb[6] << 24) | (cdb[7] << 16) | - (cdb[8] << 8) | cdb[9]; - } else { - /* GPCMD_REPORT_KEY from multi media commands */ - size = (cdb[8] << 8) + cdb[9]; - } - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; - case INQUIRY: - size = (cdb[3] << 8) + cdb[4]; - /* - * Do implict HEAD_OF_QUEUE processing for INQUIRY. - * See spc4r17 section 5.3 - */ - if (SE_DEV(cmd)->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) - cmd->sam_task_attr = TASK_ATTR_HOQ; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; - case READ_BUFFER: - size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; - case READ_CAPACITY: - size = READ_CAP_LEN; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; - case READ_MEDIA_SERIAL_NUMBER: - case SECURITY_PROTOCOL_IN: - case SECURITY_PROTOCOL_OUT: - size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; - case SERVICE_ACTION_IN: - case ACCESS_CONTROL_IN: - case ACCESS_CONTROL_OUT: - case EXTENDED_COPY: - case READ_ATTRIBUTE: - case RECEIVE_COPY_RESULTS: - case WRITE_ATTRIBUTE: - size = (cdb[10] << 24) | (cdb[11] << 16) | - (cdb[12] << 8) | cdb[13]; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; - case RECEIVE_DIAGNOSTIC: - case SEND_DIAGNOSTIC: - size = (cdb[3] << 8) | cdb[4]; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; -/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */ -#if 0 - case GPCMD_READ_CD: - sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; - size = (2336 * sectors); - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; -#endif - case READ_TOC: - size = cdb[8]; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; - case REQUEST_SENSE: - size = cdb[4]; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; - case READ_ELEMENT_STATUS: - size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9]; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; - case WRITE_BUFFER: - size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; - case RESERVE: - case RESERVE_10: - /* - * The SPC-2 RESERVE does not contain a size in the SCSI CDB. - * Assume the passthrough or $FABRIC_MOD will tell us about it. - */ - if (cdb[0] == RESERVE_10) - size = (cdb[7] << 8) | cdb[8]; - else - size = cmd->data_length; - - /* - * Setup the legacy emulated handler for SPC-2 and - * >= SPC-3 compatible reservation handling (CRH=1) - * Otherwise, we assume the underlying SCSI logic is - * is running in SPC_PASSTHROUGH, and wants reservations - * emulation disabled. - */ - cmd->transport_emulate_cdb = - (T10_RES(su_dev)->res_type != - SPC_PASSTHROUGH) ? - &core_scsi2_emulate_crh : NULL; - cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; - break; - case RELEASE: - case RELEASE_10: - /* - * The SPC-2 RELEASE does not contain a size in the SCSI CDB. - * Assume the passthrough or $FABRIC_MOD will tell us about it. - */ - if (cdb[0] == RELEASE_10) - size = (cdb[7] << 8) | cdb[8]; - else - size = cmd->data_length; - - cmd->transport_emulate_cdb = - (T10_RES(su_dev)->res_type != - SPC_PASSTHROUGH) ? - &core_scsi2_emulate_crh : NULL; - cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; - break; - case SYNCHRONIZE_CACHE: - case 0x91: /* SYNCHRONIZE_CACHE_16: */ - /* - * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE - */ - if (cdb[0] == SYNCHRONIZE_CACHE) { - sectors = transport_get_sectors_10(cdb, cmd, §or_ret); - T_TASK(cmd)->t_task_lba = transport_lba_32(cdb); - } else { - sectors = transport_get_sectors_16(cdb, cmd, §or_ret); - T_TASK(cmd)->t_task_lba = transport_lba_64(cdb); - } - if (sector_ret) - goto out_unsupported_cdb; - - size = transport_get_size(sectors, cdb, cmd); - cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; - - /* - * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb() - */ - if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) - break; - /* - * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation - * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks() - */ - cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC; - /* - * Check to ensure that LBA + Range does not exceed past end of - * device. - */ - if (transport_get_sectors(cmd) < 0) - goto out_invalid_cdb_field; - break; - case UNMAP: - size = get_unaligned_be16(&cdb[7]); - passthrough = (TRANSPORT(dev)->transport_type == - TRANSPORT_PLUGIN_PHBA_PDEV); - /* - * Determine if the received UNMAP used to for direct passthrough - * into Linux/SCSI with struct request via TCM/pSCSI or we are - * signaling the use of internal transport_generic_unmap() emulation - * for UNMAP -> Linux/BLOCK disbard with TCM/IBLOCK and TCM/FILEIO - * subsystem plugin backstores. - */ - if (!(passthrough)) - cmd->se_cmd_flags |= SCF_EMULATE_SYNC_UNMAP; - - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; - break; - case WRITE_SAME_16: - sectors = transport_get_sectors_16(cdb, cmd, §or_ret); - if (sector_ret) - goto out_unsupported_cdb; - size = transport_get_size(sectors, cdb, cmd); - T_TASK(cmd)->t_task_lba = get_unaligned_be16(&cdb[2]); - passthrough = (TRANSPORT(dev)->transport_type == - TRANSPORT_PLUGIN_PHBA_PDEV); - /* - * Determine if the received WRITE_SAME_16 is used to for direct - * passthrough into Linux/SCSI with struct request via TCM/pSCSI - * or we are signaling the use of internal WRITE_SAME + UNMAP=1 - * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK and - * TCM/FILEIO subsystem plugin backstores. - */ - if (!(passthrough)) { - if ((cdb[1] & 0x04) || (cdb[1] & 0x02)) { - printk(KERN_ERR "WRITE_SAME PBDATA and LBDATA" - " bits not supported for Block Discard" - " Emulation\n"); - goto out_invalid_cdb_field; - } - /* - * Currently for the emulated case we only accept - * tpws with the UNMAP=1 bit set. - */ - if (!(cdb[1] & 0x08)) { - printk(KERN_ERR "WRITE_SAME w/o UNMAP bit not " - " supported for Block Discard Emulation\n"); - goto out_invalid_cdb_field; - } - } - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; - break; - case ALLOW_MEDIUM_REMOVAL: - case GPCMD_CLOSE_TRACK: - case ERASE: - case INITIALIZE_ELEMENT_STATUS: - case GPCMD_LOAD_UNLOAD: - case REZERO_UNIT: - case SEEK_10: - case GPCMD_SET_SPEED: - case SPACE: - case START_STOP: - case TEST_UNIT_READY: - case VERIFY: - case WRITE_FILEMARKS: - case MOVE_MEDIUM: - cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; - break; - case REPORT_LUNS: - cmd->transport_emulate_cdb = - &transport_core_report_lun_response; - size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; - /* - * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS - * See spc4r17 section 5.3 - */ - if (SE_DEV(cmd)->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) - cmd->sam_task_attr = TASK_ATTR_HOQ; - cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; + /* Fall through for DMA_TO_DEVICE */ + case DMA_NONE: + trace_target_cmd_complete(cmd); + ret = cmd->se_tfo->queue_status(cmd); break; default: - printk(KERN_WARNING "TARGET_CORE[%s]: Unsupported SCSI Opcode" - " 0x%02x, sending CHECK_CONDITION.\n", - CMD_TFO(cmd)->get_fabric_name(), cdb[0]); - cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks; - goto out_unsupported_cdb; + break; } - if (size != cmd->data_length) { - printk(KERN_WARNING "TARGET_CORE[%s]: Expected Transfer Length:" - " %u does not match SCSI CDB Length: %u for SAM Opcode:" - " 0x%02x\n", CMD_TFO(cmd)->get_fabric_name(), - cmd->data_length, size, cdb[0]); - - cmd->cmd_spdtl = size; - - if (cmd->data_direction == DMA_TO_DEVICE) { - printk(KERN_ERR "Rejecting underflow/overflow" - " WRITE data\n"); - goto out_invalid_cdb_field; - } - /* - * Reject READ_* or WRITE_* with overflow/underflow for - * type SCF_SCSI_DATA_SG_IO_CDB. - */ - if (!(ret) && (DEV_ATTRIB(dev)->block_size != 512)) { - printk(KERN_ERR "Failing OVERFLOW/UNDERFLOW for LBA op" - " CDB on non 512-byte sector setup subsystem" - " plugin: %s\n", TRANSPORT(dev)->name); - /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ - goto out_invalid_cdb_field; - } - - if (size > cmd->data_length) { - cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; - cmd->residual_count = (size - cmd->data_length); - } else { - cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; - cmd->residual_count = (cmd->data_length - size); - } - cmd->data_length = size; +out: + if (ret < 0) { + transport_handle_queue_full(cmd, cmd->se_dev); + return; } - - transport_set_supported_SAM_opcode(cmd); - return ret; - -out_unsupported_cdb: - cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; - cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; - return -2; -out_invalid_cdb_field: - cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; - cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; - return -2; + transport_lun_remove_cmd(cmd); + transport_cmd_check_stop_to_fabric(cmd); } -static inline void transport_release_tasks(struct se_cmd *); - -/* - * This function will copy a contiguous *src buffer into a destination - * struct scatterlist array. - */ -static void transport_memcpy_write_contig( +static void transport_handle_queue_full( struct se_cmd *cmd, - struct scatterlist *sg_d, - unsigned char *src) + struct se_device *dev) { - u32 i = 0, length = 0, total_length = cmd->data_length; - void *dst; - - while (total_length) { - length = sg_d[i].length; - - if (length > total_length) - length = total_length; - - dst = sg_virt(&sg_d[i]); - - memcpy(dst, src, length); - - if (!(total_length -= length)) - return; + spin_lock_irq(&dev->qf_cmd_lock); + list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); + atomic_inc(&dev->dev_qf_count); + smp_mb__after_atomic(); + spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); - src += length; - i++; - } + schedule_work(&cmd->se_dev->qf_work_queue); } -/* - * This function will copy a struct scatterlist array *sg_s into a destination - * contiguous *dst buffer. - */ -static void transport_memcpy_read_contig( - struct se_cmd *cmd, - unsigned char *dst, - struct scatterlist *sg_s) +static bool target_check_read_strip(struct se_cmd *cmd) { - u32 i = 0, length = 0, total_length = cmd->data_length; - void *src; - - while (total_length) { - length = sg_s[i].length; - - if (length > total_length) - length = total_length; + sense_reason_t rc; - src = sg_virt(&sg_s[i]); - - memcpy(dst, src, length); - - if (!(total_length -= length)) - return; - - dst += length; - i++; + if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) { + rc = sbc_dif_read_strip(cmd); + if (rc) { + cmd->pi_err = rc; + return true; + } } -} - -static void transport_memcpy_se_mem_read_contig( - struct se_cmd *cmd, - unsigned char *dst, - struct list_head *se_mem_list) -{ - struct se_mem *se_mem; - void *src; - u32 length = 0, total_length = cmd->data_length; - - list_for_each_entry(se_mem, se_mem_list, se_list) { - length = se_mem->se_len; - - if (length > total_length) - length = total_length; - - src = page_address(se_mem->se_page) + se_mem->se_off; - memcpy(dst, src, length); - - if (!(total_length -= length)) - return; - - dst += length; - } + return false; } -/* - * Called from transport_generic_complete_ok() and - * transport_generic_request_failure() to determine which dormant/delayed - * and ordered cmds need to have their tasks added to the execution queue. - */ -static void transport_complete_task_attr(struct se_cmd *cmd) +static void target_complete_ok_work(struct work_struct *work) { - struct se_device *dev = SE_DEV(cmd); - struct se_cmd *cmd_p, *cmd_tmp; - int new_active_tasks = 0; - - if (cmd->sam_task_attr == TASK_ATTR_SIMPLE) { - atomic_dec(&dev->simple_cmds); - smp_mb__after_atomic_dec(); - dev->dev_cur_ordered_id++; - DEBUG_STA("Incremented dev->dev_cur_ordered_id: %u for" - " SIMPLE: %u\n", dev->dev_cur_ordered_id, - cmd->se_ordered_id); - } else if (cmd->sam_task_attr == TASK_ATTR_HOQ) { - atomic_dec(&dev->dev_hoq_count); - smp_mb__after_atomic_dec(); - dev->dev_cur_ordered_id++; - DEBUG_STA("Incremented dev_cur_ordered_id: %u for" - " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, - cmd->se_ordered_id); - } else if (cmd->sam_task_attr == TASK_ATTR_ORDERED) { - spin_lock(&dev->ordered_cmd_lock); - list_del(&cmd->se_ordered_list); - atomic_dec(&dev->dev_ordered_sync); - smp_mb__after_atomic_dec(); - spin_unlock(&dev->ordered_cmd_lock); + struct se_cmd *cmd = container_of(work, struct se_cmd, work); + int ret; - dev->dev_cur_ordered_id++; - DEBUG_STA("Incremented dev_cur_ordered_id: %u for ORDERED:" - " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); - } /* - * Process all commands up to the last received - * ORDERED task attribute which requires another blocking - * boundary + * Check if we need to move delayed/dormant tasks from cmds on the + * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task + * Attribute. */ - spin_lock(&dev->delayed_cmd_lock); - list_for_each_entry_safe(cmd_p, cmd_tmp, - &dev->delayed_cmd_list, se_delayed_list) { - - list_del(&cmd_p->se_delayed_list); - spin_unlock(&dev->delayed_cmd_lock); + transport_complete_task_attr(cmd); - DEBUG_STA("Calling add_tasks() for" - " cmd_p: 0x%02x Task Attr: 0x%02x" - " Dormant -> Active, se_ordered_id: %u\n", - T_TASK(cmd_p)->t_task_cdb[0], - cmd_p->sam_task_attr, cmd_p->se_ordered_id); - - transport_add_tasks_from_cmd(cmd_p); - new_active_tasks++; - - spin_lock(&dev->delayed_cmd_lock); - if (cmd_p->sam_task_attr == TASK_ATTR_ORDERED) - break; - } - spin_unlock(&dev->delayed_cmd_lock); /* - * If new tasks have become active, wake up the transport thread - * to do the processing of the Active tasks. + * Check to schedule QUEUE_FULL work, or execute an existing + * cmd->transport_qf_callback() */ - if (new_active_tasks != 0) - wake_up_interruptible(&dev->dev_queue_obj->thread_wq); -} + if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) + schedule_work(&cmd->se_dev->qf_work_queue); -static void transport_generic_complete_ok(struct se_cmd *cmd) -{ - int reason = 0; - /* - * Check if we need to move delayed/dormant tasks from cmds on the - * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task - * Attribute. - */ - if (SE_DEV(cmd)->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) - transport_complete_task_attr(cmd); /* - * Check if we need to retrieve a sense buffer from + * Check if we need to send a sense buffer from * the struct se_cmd in question. */ if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { - if (transport_get_sense_data(cmd) < 0) - reason = TCM_NON_EXISTENT_LUN; + WARN_ON(!cmd->scsi_status); + ret = transport_send_check_condition_and_sense( + cmd, 0, 1); + if (ret == -EAGAIN || ret == -ENOMEM) + goto queue_full; + + transport_lun_remove_cmd(cmd); + transport_cmd_check_stop_to_fabric(cmd); + return; + } + /* + * Check for a callback, used by amongst other things + * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation. + */ + if (cmd->transport_complete_callback) { + sense_reason_t rc; + + rc = cmd->transport_complete_callback(cmd); + if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) { + return; + } else if (rc) { + ret = transport_send_check_condition_and_sense(cmd, + rc, 0); + if (ret == -EAGAIN || ret == -ENOMEM) + goto queue_full; - /* - * Only set when an struct se_task->task_scsi_status returned - * a non GOOD status. - */ - if (cmd->scsi_status) { - transport_send_check_condition_and_sense( - cmd, reason, 1); transport_lun_remove_cmd(cmd); transport_cmd_check_stop_to_fabric(cmd); return; } } - /* - * Check for a callback, used by amoungst other things - * XDWRITE_READ_10 emulation. - */ - if (cmd->transport_complete_callback) - cmd->transport_complete_callback(cmd); switch (cmd->data_direction) { case DMA_FROM_DEVICE: spin_lock(&cmd->se_lun->lun_sep_lock); - if (SE_LUN(cmd)->lun_sep) { - SE_LUN(cmd)->lun_sep->sep_stats.tx_data_octets += + if (cmd->se_lun->lun_sep) { + cmd->se_lun->lun_sep->sep_stats.tx_data_octets += cmd->data_length; } spin_unlock(&cmd->se_lun->lun_sep_lock); /* - * If enabled by TCM fabirc module pre-registered SGL - * memory, perform the memcpy() from the TCM internal - * contigious buffer back to the original SGL. + * Perform READ_STRIP of PI using software emulation when + * backend had PI enabled, if the transport will not be + * performing hardware READ_STRIP offload. */ - if (cmd->se_cmd_flags & SCF_PASSTHROUGH_CONTIG_TO_SG) - transport_memcpy_write_contig(cmd, - T_TASK(cmd)->t_task_pt_sgl, - T_TASK(cmd)->t_task_buf); + if (cmd->prot_op == TARGET_PROT_DIN_STRIP && + target_check_read_strip(cmd)) { + ret = transport_send_check_condition_and_sense(cmd, + cmd->pi_err, 0); + if (ret == -EAGAIN || ret == -ENOMEM) + goto queue_full; - CMD_TFO(cmd)->queue_data_in(cmd); + transport_lun_remove_cmd(cmd); + transport_cmd_check_stop_to_fabric(cmd); + return; + } + + trace_target_cmd_complete(cmd); + ret = cmd->se_tfo->queue_data_in(cmd); + if (ret == -EAGAIN || ret == -ENOMEM) + goto queue_full; break; case DMA_TO_DEVICE: spin_lock(&cmd->se_lun->lun_sep_lock); - if (SE_LUN(cmd)->lun_sep) { - SE_LUN(cmd)->lun_sep->sep_stats.rx_data_octets += + if (cmd->se_lun->lun_sep) { + cmd->se_lun->lun_sep->sep_stats.rx_data_octets += cmd->data_length; } spin_unlock(&cmd->se_lun->lun_sep_lock); /* * Check if we need to send READ payload for BIDI-COMMAND */ - if (T_TASK(cmd)->t_mem_bidi_list != NULL) { + if (cmd->se_cmd_flags & SCF_BIDI) { spin_lock(&cmd->se_lun->lun_sep_lock); - if (SE_LUN(cmd)->lun_sep) { - SE_LUN(cmd)->lun_sep->sep_stats.tx_data_octets += + if (cmd->se_lun->lun_sep) { + cmd->se_lun->lun_sep->sep_stats.tx_data_octets += cmd->data_length; } spin_unlock(&cmd->se_lun->lun_sep_lock); - CMD_TFO(cmd)->queue_data_in(cmd); + ret = cmd->se_tfo->queue_data_in(cmd); + if (ret == -EAGAIN || ret == -ENOMEM) + goto queue_full; break; } /* Fall through for DMA_TO_DEVICE */ case DMA_NONE: - CMD_TFO(cmd)->queue_status(cmd); + trace_target_cmd_complete(cmd); + ret = cmd->se_tfo->queue_status(cmd); + if (ret == -EAGAIN || ret == -ENOMEM) + goto queue_full; break; default: break; @@ -3927,1659 +2059,515 @@ static void transport_generic_complete_ok(struct se_cmd *cmd) transport_lun_remove_cmd(cmd); transport_cmd_check_stop_to_fabric(cmd); + return; + +queue_full: + pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," + " data_direction: %d\n", cmd, cmd->data_direction); + cmd->t_state = TRANSPORT_COMPLETE_QF_OK; + transport_handle_queue_full(cmd, cmd->se_dev); } -static void transport_free_dev_tasks(struct se_cmd *cmd) +static inline void transport_free_sgl(struct scatterlist *sgl, int nents) { - struct se_task *task, *task_tmp; - unsigned long flags; - - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - list_for_each_entry_safe(task, task_tmp, - &T_TASK(cmd)->t_task_list, t_list) { - if (atomic_read(&task->task_active)) - continue; - - kfree(task->task_sg_bidi); - kfree(task->task_sg); + struct scatterlist *sg; + int count; - list_del(&task->t_list); + for_each_sg(sgl, sg, nents, count) + __free_page(sg_page(sg)); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - if (task->se_dev) - TRANSPORT(task->se_dev)->free_task(task); - else - printk(KERN_ERR "task[%u] - task->se_dev is NULL\n", - task->task_no); - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - } - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); + kfree(sgl); } -static inline void transport_free_pages(struct se_cmd *cmd) +static inline void transport_reset_sgl_orig(struct se_cmd *cmd) { - struct se_mem *se_mem, *se_mem_tmp; - int free_page = 1; - - if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) - free_page = 0; - if (cmd->se_dev->transport->do_se_mem_map) - free_page = 0; - - if (T_TASK(cmd)->t_task_buf) { - kfree(T_TASK(cmd)->t_task_buf); - T_TASK(cmd)->t_task_buf = NULL; - return; - } - /* - * Caller will handle releasing of struct se_mem. + * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE + * emulation, and free + reset pointers if necessary.. */ - if (cmd->se_cmd_flags & SCF_CMD_PASSTHROUGH_NOALLOC) + if (!cmd->t_data_sg_orig) return; - if (!(T_TASK(cmd)->t_tasks_se_num)) - return; - - list_for_each_entry_safe(se_mem, se_mem_tmp, - T_TASK(cmd)->t_mem_list, se_list) { - /* - * We only release call __free_page(struct se_mem->se_page) when - * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use, - */ - if (free_page) - __free_page(se_mem->se_page); - - list_del(&se_mem->se_list); - kmem_cache_free(se_mem_cache, se_mem); - } - - if (T_TASK(cmd)->t_mem_bidi_list && T_TASK(cmd)->t_tasks_se_bidi_num) { - list_for_each_entry_safe(se_mem, se_mem_tmp, - T_TASK(cmd)->t_mem_bidi_list, se_list) { - /* - * We only release call __free_page(struct se_mem->se_page) when - * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use, - */ - if (free_page) - __free_page(se_mem->se_page); - - list_del(&se_mem->se_list); - kmem_cache_free(se_mem_cache, se_mem); - } - } - - kfree(T_TASK(cmd)->t_mem_bidi_list); - T_TASK(cmd)->t_mem_bidi_list = NULL; - kfree(T_TASK(cmd)->t_mem_list); - T_TASK(cmd)->t_mem_list = NULL; - T_TASK(cmd)->t_tasks_se_num = 0; + kfree(cmd->t_data_sg); + cmd->t_data_sg = cmd->t_data_sg_orig; + cmd->t_data_sg_orig = NULL; + cmd->t_data_nents = cmd->t_data_nents_orig; + cmd->t_data_nents_orig = 0; } -static inline void transport_release_tasks(struct se_cmd *cmd) -{ - transport_free_dev_tasks(cmd); -} - -static inline int transport_dec_and_check(struct se_cmd *cmd) -{ - unsigned long flags; - - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - if (atomic_read(&T_TASK(cmd)->t_fe_count)) { - if (!(atomic_dec_and_test(&T_TASK(cmd)->t_fe_count))) { - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, - flags); - return 1; - } - } - - if (atomic_read(&T_TASK(cmd)->t_se_count)) { - if (!(atomic_dec_and_test(&T_TASK(cmd)->t_se_count))) { - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, - flags); - return 1; - } - } - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - - return 0; -} - -static void transport_release_fe_cmd(struct se_cmd *cmd) +static inline void transport_free_pages(struct se_cmd *cmd) { - unsigned long flags; - - if (transport_dec_and_check(cmd)) + if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) { + transport_reset_sgl_orig(cmd); return; - - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) { - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - goto free_pages; - } - atomic_set(&T_TASK(cmd)->transport_dev_active, 0); - transport_all_task_dev_remove_state(cmd); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - - transport_release_tasks(cmd); -free_pages: - transport_free_pages(cmd); - transport_free_se_cmd(cmd); - CMD_TFO(cmd)->release_cmd_direct(cmd); -} - -static int transport_generic_remove( - struct se_cmd *cmd, - int release_to_pool, - int session_reinstatement) -{ - unsigned long flags; - - if (!(T_TASK(cmd))) - goto release_cmd; - - if (transport_dec_and_check(cmd)) { - if (session_reinstatement) { - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - transport_all_task_dev_remove_state(cmd); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, - flags); - } - return 1; - } - - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) { - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - goto free_pages; } - atomic_set(&T_TASK(cmd)->transport_dev_active, 0); - transport_all_task_dev_remove_state(cmd); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); + transport_reset_sgl_orig(cmd); - transport_release_tasks(cmd); -free_pages: - transport_free_pages(cmd); + transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); + cmd->t_data_sg = NULL; + cmd->t_data_nents = 0; -release_cmd: - if (release_to_pool) { - transport_release_cmd_to_pool(cmd); - } else { - transport_free_se_cmd(cmd); - CMD_TFO(cmd)->release_cmd_direct(cmd); - } + transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); + cmd->t_bidi_data_sg = NULL; + cmd->t_bidi_data_nents = 0; - return 0; + transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents); + cmd->t_prot_sg = NULL; + cmd->t_prot_nents = 0; } -/* - * transport_generic_map_mem_to_cmd - Perform SGL -> struct se_mem map - * @cmd: Associated se_cmd descriptor - * @mem: SGL style memory for TCM WRITE / READ - * @sg_mem_num: Number of SGL elements - * @mem_bidi_in: SGL style memory for TCM BIDI READ - * @sg_mem_bidi_num: Number of BIDI READ SGL elements +/** + * transport_release_cmd - free a command + * @cmd: command to free * - * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage - * of parameters. + * This routine unconditionally frees a command, and reference counting + * or list removal must be done in the caller. */ -int transport_generic_map_mem_to_cmd( - struct se_cmd *cmd, - struct scatterlist *mem, - u32 sg_mem_num, - struct scatterlist *mem_bidi_in, - u32 sg_mem_bidi_num) +static int transport_release_cmd(struct se_cmd *cmd) { - u32 se_mem_cnt_out = 0; - int ret; + BUG_ON(!cmd->se_tfo); - if (!(mem) || !(sg_mem_num)) - return 0; - /* - * Passed *mem will contain a list_head containing preformatted - * struct se_mem elements... - */ - if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM)) { - if ((mem_bidi_in) || (sg_mem_bidi_num)) { - printk(KERN_ERR "SCF_CMD_PASSTHROUGH_NOALLOC not supported" - " with BIDI-COMMAND\n"); - return -ENOSYS; - } - - T_TASK(cmd)->t_mem_list = (struct list_head *)mem; - T_TASK(cmd)->t_tasks_se_num = sg_mem_num; - cmd->se_cmd_flags |= SCF_CMD_PASSTHROUGH_NOALLOC; - return 0; - } + if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) + core_tmr_release_req(cmd->se_tmr_req); + if (cmd->t_task_cdb != cmd->__t_task_cdb) + kfree(cmd->t_task_cdb); /* - * Otherwise, assume the caller is passing a struct scatterlist - * array from include/linux/scatterlist.h + * If this cmd has been setup with target_get_sess_cmd(), drop + * the kref and call ->release_cmd() in kref callback. */ - if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) || - (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) { - /* - * For CDB using TCM struct se_mem linked list scatterlist memory - * processed into a TCM struct se_subsystem_dev, we do the mapping - * from the passed physical memory to struct se_mem->se_page here. - */ - T_TASK(cmd)->t_mem_list = transport_init_se_mem_list(); - if (!(T_TASK(cmd)->t_mem_list)) - return -ENOMEM; - - ret = transport_map_sg_to_mem(cmd, - T_TASK(cmd)->t_mem_list, mem, &se_mem_cnt_out); - if (ret < 0) - return -ENOMEM; - - T_TASK(cmd)->t_tasks_se_num = se_mem_cnt_out; - /* - * Setup BIDI READ list of struct se_mem elements - */ - if ((mem_bidi_in) && (sg_mem_bidi_num)) { - T_TASK(cmd)->t_mem_bidi_list = transport_init_se_mem_list(); - if (!(T_TASK(cmd)->t_mem_bidi_list)) { - kfree(T_TASK(cmd)->t_mem_list); - return -ENOMEM; - } - se_mem_cnt_out = 0; - - ret = transport_map_sg_to_mem(cmd, - T_TASK(cmd)->t_mem_bidi_list, mem_bidi_in, - &se_mem_cnt_out); - if (ret < 0) { - kfree(T_TASK(cmd)->t_mem_list); - return -ENOMEM; - } - - T_TASK(cmd)->t_tasks_se_bidi_num = se_mem_cnt_out; - } - cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; - - } else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) { - if (mem_bidi_in || sg_mem_bidi_num) { - printk(KERN_ERR "BIDI-Commands not supported using " - "SCF_SCSI_CONTROL_NONSG_IO_CDB\n"); - return -ENOSYS; - } - /* - * For incoming CDBs using a contiguous buffer internall with TCM, - * save the passed struct scatterlist memory. After TCM storage object - * processing has completed for this struct se_cmd, TCM core will call - * transport_memcpy_[write,read]_contig() as necessary from - * transport_generic_complete_ok() and transport_write_pending() in order - * to copy the TCM buffer to/from the original passed *mem in SGL -> - * struct scatterlist format. - */ - cmd->se_cmd_flags |= SCF_PASSTHROUGH_CONTIG_TO_SG; - T_TASK(cmd)->t_task_pt_sgl = mem; - } - - return 0; + return target_put_sess_cmd(cmd->se_sess, cmd); } -EXPORT_SYMBOL(transport_generic_map_mem_to_cmd); - -static inline long long transport_dev_end_lba(struct se_device *dev) +/** + * transport_put_cmd - release a reference to a command + * @cmd: command to release + * + * This routine releases our reference to the command and frees it if possible. + */ +static int transport_put_cmd(struct se_cmd *cmd) { - return dev->transport->get_blocks(dev) + 1; + transport_free_pages(cmd); + return transport_release_cmd(cmd); } -static int transport_get_sectors(struct se_cmd *cmd) +void *transport_kmap_data_sg(struct se_cmd *cmd) { - struct se_device *dev = SE_DEV(cmd); - - T_TASK(cmd)->t_tasks_sectors = - (cmd->data_length / DEV_ATTRIB(dev)->block_size); - if (!(T_TASK(cmd)->t_tasks_sectors)) - T_TASK(cmd)->t_tasks_sectors = 1; - - if (TRANSPORT(dev)->get_device_type(dev) != TYPE_DISK) - return 0; - - if ((T_TASK(cmd)->t_task_lba + T_TASK(cmd)->t_tasks_sectors) > - transport_dev_end_lba(dev)) { - printk(KERN_ERR "LBA: %llu Sectors: %u exceeds" - " transport_dev_end_lba(): %llu\n", - T_TASK(cmd)->t_task_lba, T_TASK(cmd)->t_tasks_sectors, - transport_dev_end_lba(dev)); - cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; - cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY; - return PYX_TRANSPORT_REQ_TOO_MANY_SECTORS; - } + struct scatterlist *sg = cmd->t_data_sg; + struct page **pages; + int i; - return 0; -} + /* + * We need to take into account a possible offset here for fabrics like + * tcm_loop who may be using a contig buffer from the SCSI midlayer for + * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() + */ + if (!cmd->t_data_nents) + return NULL; -static int transport_new_cmd_obj(struct se_cmd *cmd) -{ - struct se_device *dev = SE_DEV(cmd); - u32 task_cdbs = 0, rc; + BUG_ON(!sg); + if (cmd->t_data_nents == 1) + return kmap(sg_page(sg)) + sg->offset; - if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) { - task_cdbs++; - T_TASK(cmd)->t_task_cdbs++; - } else { - int set_counts = 1; + /* >1 page. use vmap */ + pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL); + if (!pages) + return NULL; - /* - * Setup any BIDI READ tasks and memory from - * T_TASK(cmd)->t_mem_bidi_list so the READ struct se_tasks - * are queued first for the non pSCSI passthrough case. - */ - if ((T_TASK(cmd)->t_mem_bidi_list != NULL) && - (TRANSPORT(dev)->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) { - rc = transport_generic_get_cdb_count(cmd, - T_TASK(cmd)->t_task_lba, - T_TASK(cmd)->t_tasks_sectors, - DMA_FROM_DEVICE, T_TASK(cmd)->t_mem_bidi_list, - set_counts); - if (!(rc)) { - cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; - cmd->scsi_sense_reason = - TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; - return PYX_TRANSPORT_LU_COMM_FAILURE; - } - set_counts = 0; - } - /* - * Setup the tasks and memory from T_TASK(cmd)->t_mem_list - * Note for BIDI transfers this will contain the WRITE payload - */ - task_cdbs = transport_generic_get_cdb_count(cmd, - T_TASK(cmd)->t_task_lba, - T_TASK(cmd)->t_tasks_sectors, - cmd->data_direction, T_TASK(cmd)->t_mem_list, - set_counts); - if (!(task_cdbs)) { - cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; - cmd->scsi_sense_reason = - TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; - return PYX_TRANSPORT_LU_COMM_FAILURE; - } - T_TASK(cmd)->t_task_cdbs += task_cdbs; - -#if 0 - printk(KERN_INFO "data_length: %u, LBA: %llu t_tasks_sectors:" - " %u, t_task_cdbs: %u\n", obj_ptr, cmd->data_length, - T_TASK(cmd)->t_task_lba, T_TASK(cmd)->t_tasks_sectors, - T_TASK(cmd)->t_task_cdbs); -#endif + /* convert sg[] to pages[] */ + for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { + pages[i] = sg_page(sg); } - atomic_set(&T_TASK(cmd)->t_task_cdbs_left, task_cdbs); - atomic_set(&T_TASK(cmd)->t_task_cdbs_ex_left, task_cdbs); - atomic_set(&T_TASK(cmd)->t_task_cdbs_timeout_left, task_cdbs); - return 0; + cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); + kfree(pages); + if (!cmd->t_data_vmap) + return NULL; + + return cmd->t_data_vmap + cmd->t_data_sg[0].offset; } +EXPORT_SYMBOL(transport_kmap_data_sg); -static struct list_head *transport_init_se_mem_list(void) +void transport_kunmap_data_sg(struct se_cmd *cmd) { - struct list_head *se_mem_list; - - se_mem_list = kzalloc(sizeof(struct list_head), GFP_KERNEL); - if (!(se_mem_list)) { - printk(KERN_ERR "Unable to allocate memory for se_mem_list\n"); - return NULL; + if (!cmd->t_data_nents) { + return; + } else if (cmd->t_data_nents == 1) { + kunmap(sg_page(cmd->t_data_sg)); + return; } - INIT_LIST_HEAD(se_mem_list); - return se_mem_list; + vunmap(cmd->t_data_vmap); + cmd->t_data_vmap = NULL; } +EXPORT_SYMBOL(transport_kunmap_data_sg); -static int -transport_generic_get_mem(struct se_cmd *cmd, u32 length, u32 dma_size) +int +target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length, + bool zero_page) { - unsigned char *buf; - struct se_mem *se_mem; - - T_TASK(cmd)->t_mem_list = transport_init_se_mem_list(); - if (!(T_TASK(cmd)->t_mem_list)) + struct scatterlist *sg; + struct page *page; + gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0; + unsigned int nent; + int i = 0; + + nent = DIV_ROUND_UP(length, PAGE_SIZE); + sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL); + if (!sg) return -ENOMEM; - /* - * If the device uses memory mapping this is enough. - */ - if (cmd->se_dev->transport->do_se_mem_map) - return 0; - - /* - * Setup BIDI-COMMAND READ list of struct se_mem elements - */ - if (T_TASK(cmd)->t_tasks_bidi) { - T_TASK(cmd)->t_mem_bidi_list = transport_init_se_mem_list(); - if (!(T_TASK(cmd)->t_mem_bidi_list)) { - kfree(T_TASK(cmd)->t_mem_list); - return -ENOMEM; - } - } + sg_init_table(sg, nent); while (length) { - se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL); - if (!(se_mem)) { - printk(KERN_ERR "Unable to allocate struct se_mem\n"); + u32 page_len = min_t(u32, length, PAGE_SIZE); + page = alloc_page(GFP_KERNEL | zero_flag); + if (!page) goto out; - } - INIT_LIST_HEAD(&se_mem->se_list); - se_mem->se_len = (length > dma_size) ? dma_size : length; -/* #warning FIXME Allocate contigous pages for struct se_mem elements */ - se_mem->se_page = (struct page *) alloc_pages(GFP_KERNEL, 0); - if (!(se_mem->se_page)) { - printk(KERN_ERR "alloc_pages() failed\n"); - goto out; - } - - buf = kmap_atomic(se_mem->se_page, KM_IRQ0); - if (!(buf)) { - printk(KERN_ERR "kmap_atomic() failed\n"); - goto out; - } - memset(buf, 0, se_mem->se_len); - kunmap_atomic(buf, KM_IRQ0); - - list_add_tail(&se_mem->se_list, T_TASK(cmd)->t_mem_list); - T_TASK(cmd)->t_tasks_se_num++; - - DEBUG_MEM("Allocated struct se_mem page(%p) Length(%u)" - " Offset(%u)\n", se_mem->se_page, se_mem->se_len, - se_mem->se_off); - - length -= se_mem->se_len; + sg_set_page(&sg[i], page, page_len, 0); + length -= page_len; + i++; } - - DEBUG_MEM("Allocated total struct se_mem elements(%u)\n", - T_TASK(cmd)->t_tasks_se_num); - + *sgl = sg; + *nents = nent; return 0; + out: - return -1; + while (i > 0) { + i--; + __free_page(sg_page(&sg[i])); + } + kfree(sg); + return -ENOMEM; } -extern u32 transport_calc_sg_num( - struct se_task *task, - struct se_mem *in_se_mem, - u32 task_offset) +/* + * Allocate any required resources to execute the command. For writes we + * might not have the payload yet, so notify the fabric via a call to + * ->write_pending instead. Otherwise place it on the execution queue. + */ +sense_reason_t +transport_generic_new_cmd(struct se_cmd *cmd) { - struct se_cmd *se_cmd = task->task_se_cmd; - struct se_device *se_dev = SE_DEV(se_cmd); - struct se_mem *se_mem = in_se_mem; - struct target_core_fabric_ops *tfo = CMD_TFO(se_cmd); - u32 sg_length, task_size = task->task_size, task_sg_num_padded; - - while (task_size != 0) { - DEBUG_SC("se_mem->se_page(%p) se_mem->se_len(%u)" - " se_mem->se_off(%u) task_offset(%u)\n", - se_mem->se_page, se_mem->se_len, - se_mem->se_off, task_offset); - - if (task_offset == 0) { - if (task_size >= se_mem->se_len) { - sg_length = se_mem->se_len; - - if (!(list_is_last(&se_mem->se_list, - T_TASK(se_cmd)->t_mem_list))) - se_mem = list_entry(se_mem->se_list.next, - struct se_mem, se_list); - } else { - sg_length = task_size; - task_size -= sg_length; - goto next; - } + int ret = 0; - DEBUG_SC("sg_length(%u) task_size(%u)\n", - sg_length, task_size); - } else { - if ((se_mem->se_len - task_offset) > task_size) { - sg_length = task_size; - task_size -= sg_length; - goto next; - } else { - sg_length = (se_mem->se_len - task_offset); - - if (!(list_is_last(&se_mem->se_list, - T_TASK(se_cmd)->t_mem_list))) - se_mem = list_entry(se_mem->se_list.next, - struct se_mem, se_list); - } + /* + * Determine is the TCM fabric module has already allocated physical + * memory, and is directly calling transport_generic_map_mem_to_cmd() + * beforehand. + */ + if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && + cmd->data_length) { + bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB); - DEBUG_SC("sg_length(%u) task_size(%u)\n", - sg_length, task_size); + if ((cmd->se_cmd_flags & SCF_BIDI) || + (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) { + u32 bidi_length; - task_offset = 0; - } - task_size -= sg_length; -next: - DEBUG_SC("task[%u] - Reducing task_size to(%u)\n", - task->task_no, task_size); + if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) + bidi_length = cmd->t_task_nolb * + cmd->se_dev->dev_attrib.block_size; + else + bidi_length = cmd->data_length; - task->task_sg_num++; - } - /* - * Check if the fabric module driver is requesting that all - * struct se_task->task_sg[] be chained together.. If so, - * then allocate an extra padding SG entry for linking and - * marking the end of the chained SGL. - */ - if (tfo->task_sg_chaining) { - task_sg_num_padded = (task->task_sg_num + 1); - task->task_padded_sg = 1; - } else - task_sg_num_padded = task->task_sg_num; + ret = target_alloc_sgl(&cmd->t_bidi_data_sg, + &cmd->t_bidi_data_nents, + bidi_length, zero_flag); + if (ret < 0) + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + } - task->task_sg = kzalloc(task_sg_num_padded * - sizeof(struct scatterlist), GFP_KERNEL); - if (!(task->task_sg)) { - printk(KERN_ERR "Unable to allocate memory for" - " task->task_sg\n"); - return 0; - } - sg_init_table(&task->task_sg[0], task_sg_num_padded); - /* - * Setup task->task_sg_bidi for SCSI READ payload for - * TCM/pSCSI passthrough if present for BIDI-COMMAND - */ - if ((T_TASK(se_cmd)->t_mem_bidi_list != NULL) && - (TRANSPORT(se_dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)) { - task->task_sg_bidi = kzalloc(task_sg_num_padded * - sizeof(struct scatterlist), GFP_KERNEL); - if (!(task->task_sg_bidi)) { - printk(KERN_ERR "Unable to allocate memory for" - " task->task_sg_bidi\n"); - return 0; + if (cmd->prot_op != TARGET_PROT_NORMAL) { + ret = target_alloc_sgl(&cmd->t_prot_sg, + &cmd->t_prot_nents, + cmd->prot_length, true); + if (ret < 0) + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } - sg_init_table(&task->task_sg_bidi[0], task_sg_num_padded); + + ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents, + cmd->data_length, zero_flag); + if (ret < 0) + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } /* - * For the chaining case, setup the proper end of SGL for the - * initial submission struct task into struct se_subsystem_api. - * This will be cleared later by transport_do_task_sg_chain() + * If this command is not a write we can execute it right here, + * for write buffers we need to notify the fabric driver first + * and let it call back once the write buffers are ready. */ - if (task->task_padded_sg) { - sg_mark_end(&task->task_sg[task->task_sg_num - 1]); - /* - * Added the 'if' check before marking end of bi-directional - * scatterlist (which gets created only in case of request - * (RD + WR). - */ - if (task->task_sg_bidi) - sg_mark_end(&task->task_sg_bidi[task->task_sg_num - 1]); + target_add_to_state_list(cmd); + if (cmd->data_direction != DMA_TO_DEVICE) { + target_execute_cmd(cmd); + return 0; } + transport_cmd_check_stop(cmd, false, true); - DEBUG_SC("Successfully allocated task->task_sg_num(%u)," - " task_sg_num_padded(%u)\n", task->task_sg_num, - task_sg_num_padded); + ret = cmd->se_tfo->write_pending(cmd); + if (ret == -EAGAIN || ret == -ENOMEM) + goto queue_full; - return task->task_sg_num; -} + /* fabric drivers should only return -EAGAIN or -ENOMEM as error */ + WARN_ON(ret); -static inline int transport_set_tasks_sectors_disk( - struct se_task *task, - struct se_device *dev, - unsigned long long lba, - u32 sectors, - int *max_sectors_set) -{ - if ((lba + sectors) > transport_dev_end_lba(dev)) { - task->task_sectors = ((transport_dev_end_lba(dev) - lba) + 1); - - if (task->task_sectors > DEV_ATTRIB(dev)->max_sectors) { - task->task_sectors = DEV_ATTRIB(dev)->max_sectors; - *max_sectors_set = 1; - } - } else { - if (sectors > DEV_ATTRIB(dev)->max_sectors) { - task->task_sectors = DEV_ATTRIB(dev)->max_sectors; - *max_sectors_set = 1; - } else - task->task_sectors = sectors; - } - - return 0; -} - -static inline int transport_set_tasks_sectors_non_disk( - struct se_task *task, - struct se_device *dev, - unsigned long long lba, - u32 sectors, - int *max_sectors_set) -{ - if (sectors > DEV_ATTRIB(dev)->max_sectors) { - task->task_sectors = DEV_ATTRIB(dev)->max_sectors; - *max_sectors_set = 1; - } else - task->task_sectors = sectors; + return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; +queue_full: + pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); + cmd->t_state = TRANSPORT_COMPLETE_QF_WP; + transport_handle_queue_full(cmd, cmd->se_dev); return 0; } +EXPORT_SYMBOL(transport_generic_new_cmd); -static inline int transport_set_tasks_sectors( - struct se_task *task, - struct se_device *dev, - unsigned long long lba, - u32 sectors, - int *max_sectors_set) +static void transport_write_pending_qf(struct se_cmd *cmd) { - return (TRANSPORT(dev)->get_device_type(dev) == TYPE_DISK) ? - transport_set_tasks_sectors_disk(task, dev, lba, sectors, - max_sectors_set) : - transport_set_tasks_sectors_non_disk(task, dev, lba, sectors, - max_sectors_set); -} - -static int transport_map_sg_to_mem( - struct se_cmd *cmd, - struct list_head *se_mem_list, - void *in_mem, - u32 *se_mem_cnt) -{ - struct se_mem *se_mem; - struct scatterlist *sg; - u32 sg_count = 1, cmd_size = cmd->data_length; - - if (!in_mem) { - printk(KERN_ERR "No source scatterlist\n"); - return -1; - } - sg = (struct scatterlist *)in_mem; + int ret; - while (cmd_size) { - se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL); - if (!(se_mem)) { - printk(KERN_ERR "Unable to allocate struct se_mem\n"); - return -1; - } - INIT_LIST_HEAD(&se_mem->se_list); - DEBUG_MEM("sg_to_mem: Starting loop with cmd_size: %u" - " sg_page: %p offset: %d length: %d\n", cmd_size, - sg_page(sg), sg->offset, sg->length); - - se_mem->se_page = sg_page(sg); - se_mem->se_off = sg->offset; - - if (cmd_size > sg->length) { - se_mem->se_len = sg->length; - sg = sg_next(sg); - sg_count++; - } else - se_mem->se_len = cmd_size; - - cmd_size -= se_mem->se_len; - - DEBUG_MEM("sg_to_mem: *se_mem_cnt: %u cmd_size: %u\n", - *se_mem_cnt, cmd_size); - DEBUG_MEM("sg_to_mem: Final se_page: %p se_off: %d se_len: %d\n", - se_mem->se_page, se_mem->se_off, se_mem->se_len); - - list_add_tail(&se_mem->se_list, se_mem_list); - (*se_mem_cnt)++; + ret = cmd->se_tfo->write_pending(cmd); + if (ret == -EAGAIN || ret == -ENOMEM) { + pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", + cmd); + transport_handle_queue_full(cmd, cmd->se_dev); } - - DEBUG_MEM("task[0] - Mapped(%u) struct scatterlist segments to(%u)" - " struct se_mem\n", sg_count, *se_mem_cnt); - - if (sg_count != *se_mem_cnt) - BUG(); - - return 0; } -/* transport_map_mem_to_sg(): - * - * - */ -int transport_map_mem_to_sg( - struct se_task *task, - struct list_head *se_mem_list, - void *in_mem, - struct se_mem *in_se_mem, - struct se_mem **out_se_mem, - u32 *se_mem_cnt, - u32 *task_offset) +int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) { - struct se_cmd *se_cmd = task->task_se_cmd; - struct se_mem *se_mem = in_se_mem; - struct scatterlist *sg = (struct scatterlist *)in_mem; - u32 task_size = task->task_size, sg_no = 0; - - if (!sg) { - printk(KERN_ERR "Unable to locate valid struct" - " scatterlist pointer\n"); - return -1; - } + unsigned long flags; + int ret = 0; + + if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { + if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) + transport_wait_for_tasks(cmd); - while (task_size != 0) { + ret = transport_release_cmd(cmd); + } else { + if (wait_for_tasks) + transport_wait_for_tasks(cmd); /* - * Setup the contigious array of scatterlists for - * this struct se_task. + * Handle WRITE failure case where transport_generic_new_cmd() + * has already added se_cmd to state_list, but fabric has + * failed command before I/O submission. */ - sg_assign_page(sg, se_mem->se_page); - - if (*task_offset == 0) { - sg->offset = se_mem->se_off; - - if (task_size >= se_mem->se_len) { - sg->length = se_mem->se_len; - - if (!(list_is_last(&se_mem->se_list, - T_TASK(se_cmd)->t_mem_list))) { - se_mem = list_entry(se_mem->se_list.next, - struct se_mem, se_list); - (*se_mem_cnt)++; - } - } else { - sg->length = task_size; - /* - * Determine if we need to calculate an offset - * into the struct se_mem on the next go around.. - */ - task_size -= sg->length; - if (!(task_size)) - *task_offset = sg->length; - - goto next; - } - - } else { - sg->offset = (*task_offset + se_mem->se_off); - - if ((se_mem->se_len - *task_offset) > task_size) { - sg->length = task_size; - /* - * Determine if we need to calculate an offset - * into the struct se_mem on the next go around.. - */ - task_size -= sg->length; - if (!(task_size)) - *task_offset += sg->length; - - goto next; - } else { - sg->length = (se_mem->se_len - *task_offset); - - if (!(list_is_last(&se_mem->se_list, - T_TASK(se_cmd)->t_mem_list))) { - se_mem = list_entry(se_mem->se_list.next, - struct se_mem, se_list); - (*se_mem_cnt)++; - } - } - - *task_offset = 0; + if (cmd->state_active) { + spin_lock_irqsave(&cmd->t_state_lock, flags); + target_remove_from_state_list(cmd); + spin_unlock_irqrestore(&cmd->t_state_lock, flags); } - task_size -= sg->length; -next: - DEBUG_MEM("task[%u] mem_to_sg - sg[%u](%p)(%u)(%u) - Reducing" - " task_size to(%u), task_offset: %u\n", task->task_no, sg_no, - sg_page(sg), sg->length, sg->offset, task_size, *task_offset); - - sg_no++; - if (!(task_size)) - break; - sg = sg_next(sg); + if (cmd->se_lun) + transport_lun_remove_cmd(cmd); - if (task_size > se_cmd->data_length) - BUG(); + ret = transport_put_cmd(cmd); } - *out_se_mem = se_mem; - - DEBUG_MEM("task[%u] - Mapped(%u) struct se_mem segments to total(%u)" - " SGs\n", task->task_no, *se_mem_cnt, sg_no); - - return 0; + return ret; } +EXPORT_SYMBOL(transport_generic_free_cmd); -/* - * This function can be used by HW target mode drivers to create a linked - * scatterlist from all contiguously allocated struct se_task->task_sg[]. - * This is intended to be called during the completion path by TCM Core - * when struct target_core_fabric_ops->check_task_sg_chaining is enabled. +/* target_get_sess_cmd - Add command to active ->sess_cmd_list + * @se_sess: session to reference + * @se_cmd: command descriptor to add + * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() */ -void transport_do_task_sg_chain(struct se_cmd *cmd) -{ - struct scatterlist *sg_head = NULL, *sg_link = NULL, *sg_first = NULL; - struct scatterlist *sg_head_cur = NULL, *sg_link_cur = NULL; - struct scatterlist *sg, *sg_end = NULL, *sg_end_cur = NULL; - struct se_task *task; - struct target_core_fabric_ops *tfo = CMD_TFO(cmd); - u32 task_sg_num = 0, sg_count = 0; - int i; - - if (tfo->task_sg_chaining == 0) { - printk(KERN_ERR "task_sg_chaining is diabled for fabric module:" - " %s\n", tfo->get_fabric_name()); - dump_stack(); - return; - } - /* - * Walk the struct se_task list and setup scatterlist chains - * for each contiguosly allocated struct se_task->task_sg[]. - */ - list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) { - if (!(task->task_sg) || !(task->task_padded_sg)) - continue; - - if (sg_head && sg_link) { - sg_head_cur = &task->task_sg[0]; - sg_link_cur = &task->task_sg[task->task_sg_num]; - /* - * Either add chain or mark end of scatterlist - */ - if (!(list_is_last(&task->t_list, - &T_TASK(cmd)->t_task_list))) { - /* - * Clear existing SGL termination bit set in - * transport_calc_sg_num(), see sg_mark_end() - */ - sg_end_cur = &task->task_sg[task->task_sg_num - 1]; - sg_end_cur->page_link &= ~0x02; - - sg_chain(sg_head, task_sg_num, sg_head_cur); - sg_count += (task->task_sg_num + 1); - } else - sg_count += task->task_sg_num; - - sg_head = sg_head_cur; - sg_link = sg_link_cur; - task_sg_num = task->task_sg_num; - continue; - } - sg_head = sg_first = &task->task_sg[0]; - sg_link = &task->task_sg[task->task_sg_num]; - task_sg_num = task->task_sg_num; - /* - * Check for single task.. - */ - if (!(list_is_last(&task->t_list, &T_TASK(cmd)->t_task_list))) { - /* - * Clear existing SGL termination bit set in - * transport_calc_sg_num(), see sg_mark_end() - */ - sg_end = &task->task_sg[task->task_sg_num - 1]; - sg_end->page_link &= ~0x02; - sg_count += (task->task_sg_num + 1); - } else - sg_count += task->task_sg_num; - } - /* - * Setup the starting pointer and total t_tasks_sg_linked_no including - * padding SGs for linking and to mark the end. - */ - T_TASK(cmd)->t_tasks_sg_chained = sg_first; - T_TASK(cmd)->t_tasks_sg_chained_no = sg_count; - - DEBUG_CMD_M("Setup T_TASK(cmd)->t_tasks_sg_chained: %p and" - " t_tasks_sg_chained_no: %u\n", T_TASK(cmd)->t_tasks_sg_chained, - T_TASK(cmd)->t_tasks_sg_chained_no); - - for_each_sg(T_TASK(cmd)->t_tasks_sg_chained, sg, - T_TASK(cmd)->t_tasks_sg_chained_no, i) { - - DEBUG_CMD_M("SG: %p page: %p length: %d offset: %d\n", - sg, sg_page(sg), sg->length, sg->offset); - if (sg_is_chain(sg)) - DEBUG_CMD_M("SG: %p sg_is_chain=1\n", sg); - if (sg_is_last(sg)) - DEBUG_CMD_M("SG: %p sg_is_last=1\n", sg); - } - -} -EXPORT_SYMBOL(transport_do_task_sg_chain); - -static int transport_do_se_mem_map( - struct se_device *dev, - struct se_task *task, - struct list_head *se_mem_list, - void *in_mem, - struct se_mem *in_se_mem, - struct se_mem **out_se_mem, - u32 *se_mem_cnt, - u32 *task_offset_in) +int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd, + bool ack_kref) { - u32 task_offset = *task_offset_in; + unsigned long flags; int ret = 0; - /* - * se_subsystem_api_t->do_se_mem_map is used when internal allocation - * has been done by the transport plugin. - */ - if (TRANSPORT(dev)->do_se_mem_map) { - ret = TRANSPORT(dev)->do_se_mem_map(task, se_mem_list, - in_mem, in_se_mem, out_se_mem, se_mem_cnt, - task_offset_in); - if (ret == 0) - T_TASK(task->task_se_cmd)->t_tasks_se_num += *se_mem_cnt; - return ret; - } - - BUG_ON(list_empty(se_mem_list)); /* - * This is the normal path for all normal non BIDI and BIDI-COMMAND - * WRITE payloads.. If we need to do BIDI READ passthrough for - * TCM/pSCSI the first call to transport_do_se_mem_map -> - * transport_calc_sg_num() -> transport_map_mem_to_sg() will do the - * allocation for task->task_sg_bidi, and the subsequent call to - * transport_do_se_mem_map() from transport_generic_get_cdb_count() + * Add a second kref if the fabric caller is expecting to handle + * fabric acknowledgement that requires two target_put_sess_cmd() + * invocations before se_cmd descriptor release. */ - if (!(task->task_sg_bidi)) { - /* - * Assume default that transport plugin speaks preallocated - * scatterlists. - */ - if (!(transport_calc_sg_num(task, in_se_mem, task_offset))) - return -1; - /* - * struct se_task->task_sg now contains the struct scatterlist array. - */ - return transport_map_mem_to_sg(task, se_mem_list, task->task_sg, - in_se_mem, out_se_mem, se_mem_cnt, - task_offset_in); + if (ack_kref) { + kref_get(&se_cmd->cmd_kref); + se_cmd->se_cmd_flags |= SCF_ACK_KREF; } - /* - * Handle the se_mem_list -> struct task->task_sg_bidi - * memory map for the extra BIDI READ payload - */ - return transport_map_mem_to_sg(task, se_mem_list, task->task_sg_bidi, - in_se_mem, out_se_mem, se_mem_cnt, - task_offset_in); -} -static u32 transport_generic_get_cdb_count( - struct se_cmd *cmd, - unsigned long long lba, - u32 sectors, - enum dma_data_direction data_direction, - struct list_head *mem_list, - int set_counts) -{ - unsigned char *cdb = NULL; - struct se_task *task; - struct se_mem *se_mem = NULL, *se_mem_lout = NULL; - struct se_mem *se_mem_bidi = NULL, *se_mem_bidi_lout = NULL; - struct se_device *dev = SE_DEV(cmd); - int max_sectors_set = 0, ret; - u32 task_offset_in = 0, se_mem_cnt = 0, se_mem_bidi_cnt = 0, task_cdbs = 0; - - if (!mem_list) { - printk(KERN_ERR "mem_list is NULL in transport_generic_get" - "_cdb_count()\n"); - return 0; - } - /* - * While using RAMDISK_DR backstores is the only case where - * mem_list will ever be empty at this point. - */ - if (!(list_empty(mem_list))) - se_mem = list_entry(mem_list->next, struct se_mem, se_list); - /* - * Check for extra se_mem_bidi mapping for BIDI-COMMANDs to - * struct se_task->task_sg_bidi for TCM/pSCSI passthrough operation - */ - if ((T_TASK(cmd)->t_mem_bidi_list != NULL) && - !(list_empty(T_TASK(cmd)->t_mem_bidi_list)) && - (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)) - se_mem_bidi = list_entry(T_TASK(cmd)->t_mem_bidi_list->next, - struct se_mem, se_list); - - while (sectors) { - DEBUG_VOL("ITT[0x%08x] LBA(%llu) SectorsLeft(%u) EOBJ(%llu)\n", - CMD_TFO(cmd)->get_task_tag(cmd), lba, sectors, - transport_dev_end_lba(dev)); - - task = transport_generic_get_task(cmd, data_direction); - if (!(task)) - goto out; - - transport_set_tasks_sectors(task, dev, lba, sectors, - &max_sectors_set); - - task->task_lba = lba; - lba += task->task_sectors; - sectors -= task->task_sectors; - task->task_size = (task->task_sectors * - DEV_ATTRIB(dev)->block_size); - - cdb = TRANSPORT(dev)->get_cdb(task); - if ((cdb)) { - memcpy(cdb, T_TASK(cmd)->t_task_cdb, - scsi_command_size(T_TASK(cmd)->t_task_cdb)); - cmd->transport_split_cdb(task->task_lba, - &task->task_sectors, cdb); - } - - /* - * Perform the SE OBJ plugin and/or Transport plugin specific - * mapping for T_TASK(cmd)->t_mem_list. And setup the - * task->task_sg and if necessary task->task_sg_bidi - */ - ret = transport_do_se_mem_map(dev, task, mem_list, - NULL, se_mem, &se_mem_lout, &se_mem_cnt, - &task_offset_in); - if (ret < 0) - goto out; - - se_mem = se_mem_lout; - /* - * Setup the T_TASK(cmd)->t_mem_bidi_list -> task->task_sg_bidi - * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI - * - * Note that the first call to transport_do_se_mem_map() above will - * allocate struct se_task->task_sg_bidi in transport_do_se_mem_map() - * -> transport_calc_sg_num(), and the second here will do the - * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI. - */ - if (task->task_sg_bidi != NULL) { - ret = transport_do_se_mem_map(dev, task, - T_TASK(cmd)->t_mem_bidi_list, NULL, - se_mem_bidi, &se_mem_bidi_lout, &se_mem_bidi_cnt, - &task_offset_in); - if (ret < 0) - goto out; - - se_mem_bidi = se_mem_bidi_lout; - } - task_cdbs++; - - DEBUG_VOL("Incremented task_cdbs(%u) task->task_sg_num(%u)\n", - task_cdbs, task->task_sg_num); - - if (max_sectors_set) { - max_sectors_set = 0; - continue; - } - - if (!sectors) - break; - } - - if (set_counts) { - atomic_inc(&T_TASK(cmd)->t_fe_count); - atomic_inc(&T_TASK(cmd)->t_se_count); + spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); + if (se_sess->sess_tearing_down) { + ret = -ESHUTDOWN; + goto out; } - - DEBUG_VOL("ITT[0x%08x] total %s cdbs(%u)\n", - CMD_TFO(cmd)->get_task_tag(cmd), (data_direction == DMA_TO_DEVICE) - ? "DMA_TO_DEVICE" : "DMA_FROM_DEVICE", task_cdbs); - - return task_cdbs; + list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); out: - return 0; -} - -static int -transport_map_control_cmd_to_task(struct se_cmd *cmd) -{ - struct se_device *dev = SE_DEV(cmd); - unsigned char *cdb; - struct se_task *task; - int ret; - - task = transport_generic_get_task(cmd, cmd->data_direction); - if (!task) - return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; - - cdb = TRANSPORT(dev)->get_cdb(task); - if (cdb) - memcpy(cdb, cmd->t_task->t_task_cdb, - scsi_command_size(cmd->t_task->t_task_cdb)); - - task->task_size = cmd->data_length; - task->task_sg_num = - (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) ? 1 : 0; - - atomic_inc(&cmd->t_task->t_fe_count); - atomic_inc(&cmd->t_task->t_se_count); - - if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) { - struct se_mem *se_mem = NULL, *se_mem_lout = NULL; - u32 se_mem_cnt = 0, task_offset = 0; - - if (!list_empty(T_TASK(cmd)->t_mem_list)) - se_mem = list_entry(T_TASK(cmd)->t_mem_list->next, - struct se_mem, se_list); - - ret = transport_do_se_mem_map(dev, task, - cmd->t_task->t_mem_list, NULL, se_mem, - &se_mem_lout, &se_mem_cnt, &task_offset); - if (ret < 0) - return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; - - if (dev->transport->map_task_SG) - return dev->transport->map_task_SG(task); - return 0; - } else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) { - if (dev->transport->map_task_non_SG) - return dev->transport->map_task_non_SG(task); - return 0; - } else if (cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) { - if (dev->transport->cdb_none) - return dev->transport->cdb_none(task); - return 0; - } else { - BUG(); - return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; - } + spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); + return ret; } +EXPORT_SYMBOL(target_get_sess_cmd); -/* transport_generic_new_cmd(): Called from transport_processing_thread() - * - * Allocate storage transport resources from a set of values predefined - * by transport_generic_cmd_sequencer() from the iSCSI Target RX process. - * Any non zero return here is treated as an "out of resource' op here. - */ - /* - * Generate struct se_task(s) and/or their payloads for this CDB. - */ -static int transport_generic_new_cmd(struct se_cmd *cmd) +static void target_release_cmd_kref(struct kref *kref) { - struct se_portal_group *se_tpg; - struct se_task *task; - struct se_device *dev = SE_DEV(cmd); - int ret = 0; + struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); + struct se_session *se_sess = se_cmd->se_sess; - /* - * Determine is the TCM fabric module has already allocated physical - * memory, and is directly calling transport_generic_map_mem_to_cmd() - * to setup beforehand the linked list of physical memory at - * T_TASK(cmd)->t_mem_list of struct se_mem->se_page - */ - if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)) { - ret = transport_allocate_resources(cmd); - if (ret < 0) - return ret; - } - - ret = transport_get_sectors(cmd); - if (ret < 0) - return ret; - - ret = transport_new_cmd_obj(cmd); - if (ret < 0) - return ret; - - /* - * Determine if the calling TCM fabric module is talking to - * Linux/NET via kernel sockets and needs to allocate a - * struct iovec array to complete the struct se_cmd - */ - se_tpg = SE_LUN(cmd)->lun_sep->sep_tpg; - if (TPG_TFO(se_tpg)->alloc_cmd_iovecs != NULL) { - ret = TPG_TFO(se_tpg)->alloc_cmd_iovecs(cmd); - if (ret < 0) - return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; + if (list_empty(&se_cmd->se_cmd_list)) { + spin_unlock(&se_sess->sess_cmd_lock); + se_cmd->se_tfo->release_cmd(se_cmd); + return; } - - if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) { - list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) { - if (atomic_read(&task->task_sent)) - continue; - if (!dev->transport->map_task_SG) - continue; - - ret = dev->transport->map_task_SG(task); - if (ret < 0) - return ret; - } - } else { - ret = transport_map_control_cmd_to_task(cmd); - if (ret < 0) - return ret; + if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) { + spin_unlock(&se_sess->sess_cmd_lock); + complete(&se_cmd->cmd_wait_comp); + return; } + list_del(&se_cmd->se_cmd_list); + spin_unlock(&se_sess->sess_cmd_lock); - /* - * For WRITEs, let the iSCSI Target RX Thread know its buffer is ready.. - * This WRITE struct se_cmd (and all of its associated struct se_task's) - * will be added to the struct se_device execution queue after its WRITE - * data has arrived. (ie: It gets handled by the transport processing - * thread a second time) - */ - if (cmd->data_direction == DMA_TO_DEVICE) { - transport_add_tasks_to_state_queue(cmd); - return transport_generic_write_pending(cmd); - } - /* - * Everything else but a WRITE, add the struct se_cmd's struct se_task's - * to the execution queue. - */ - transport_execute_tasks(cmd); - return 0; + se_cmd->se_tfo->release_cmd(se_cmd); } -/* transport_generic_process_write(): - * - * +/* target_put_sess_cmd - Check for active I/O shutdown via kref_put + * @se_sess: session to reference + * @se_cmd: command descriptor to drop */ -void transport_generic_process_write(struct se_cmd *cmd) +int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd) { -#if 0 - /* - * Copy SCSI Presented DTL sector(s) from received buffers allocated to - * original EDTL - */ - if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { - if (!T_TASK(cmd)->t_tasks_se_num) { - unsigned char *dst, *buf = - (unsigned char *)T_TASK(cmd)->t_task_buf; - - dst = kzalloc(cmd->cmd_spdtl), GFP_KERNEL); - if (!(dst)) { - printk(KERN_ERR "Unable to allocate memory for" - " WRITE underflow\n"); - transport_generic_request_failure(cmd, NULL, - PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1); - return; - } - memcpy(dst, buf, cmd->cmd_spdtl); - - kfree(T_TASK(cmd)->t_task_buf); - T_TASK(cmd)->t_task_buf = dst; - } else { - struct scatterlist *sg = - (struct scatterlist *sg)T_TASK(cmd)->t_task_buf; - struct scatterlist *orig_sg; - - orig_sg = kzalloc(sizeof(struct scatterlist) * - T_TASK(cmd)->t_tasks_se_num, - GFP_KERNEL))) { - if (!(orig_sg)) { - printk(KERN_ERR "Unable to allocate memory" - " for WRITE underflow\n"); - transport_generic_request_failure(cmd, NULL, - PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1); - return; - } - - memcpy(orig_sg, T_TASK(cmd)->t_task_buf, - sizeof(struct scatterlist) * - T_TASK(cmd)->t_tasks_se_num); - - cmd->data_length = cmd->cmd_spdtl; - /* - * FIXME, clear out original struct se_task and state - * information. - */ - if (transport_generic_new_cmd(cmd) < 0) { - transport_generic_request_failure(cmd, NULL, - PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1); - kfree(orig_sg); - return; - } - - transport_memcpy_write_sg(cmd, orig_sg); - } + if (!se_sess) { + se_cmd->se_tfo->release_cmd(se_cmd); + return 1; } -#endif - transport_execute_tasks(cmd); + return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref, + &se_sess->sess_cmd_lock); } -EXPORT_SYMBOL(transport_generic_process_write); +EXPORT_SYMBOL(target_put_sess_cmd); -/* transport_generic_write_pending(): - * - * +/* target_sess_cmd_list_set_waiting - Flag all commands in + * sess_cmd_list to complete cmd_wait_comp. Set + * sess_tearing_down so no more commands are queued. + * @se_sess: session to flag */ -static int transport_generic_write_pending(struct se_cmd *cmd) +void target_sess_cmd_list_set_waiting(struct se_session *se_sess) { + struct se_cmd *se_cmd; unsigned long flags; - int ret; - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - cmd->t_state = TRANSPORT_WRITE_PENDING; - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - /* - * For the TCM control CDBs using a contiguous buffer, do the memcpy - * from the passed Linux/SCSI struct scatterlist located at - * T_TASK(se_cmd)->t_task_pt_buf to the contiguous buffer at - * T_TASK(se_cmd)->t_task_buf. - */ - if (cmd->se_cmd_flags & SCF_PASSTHROUGH_CONTIG_TO_SG) - transport_memcpy_read_contig(cmd, - T_TASK(cmd)->t_task_buf, - T_TASK(cmd)->t_task_pt_sgl); - /* - * Clear the se_cmd for WRITE_PENDING status in order to set - * T_TASK(cmd)->t_transport_active=0 so that transport_generic_handle_data - * can be called from HW target mode interrupt code. This is safe - * to be called with transport_off=1 before the CMD_TFO(cmd)->write_pending - * because the se_cmd->se_lun pointer is not being cleared. - */ - transport_cmd_check_stop(cmd, 1, 0); + spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); + if (se_sess->sess_tearing_down) { + spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); + return; + } + se_sess->sess_tearing_down = 1; + list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list); - /* - * Call the fabric write_pending function here to let the - * frontend know that WRITE buffers are ready. - */ - ret = CMD_TFO(cmd)->write_pending(cmd); - if (ret < 0) - return ret; + list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) + se_cmd->cmd_wait_set = 1; - return PYX_TRANSPORT_WRITE_PENDING; + spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); } +EXPORT_SYMBOL(target_sess_cmd_list_set_waiting); -/* transport_release_cmd_to_pool(): - * - * +/* target_wait_for_sess_cmds - Wait for outstanding descriptors + * @se_sess: session to wait for active I/O */ -void transport_release_cmd_to_pool(struct se_cmd *cmd) +void target_wait_for_sess_cmds(struct se_session *se_sess) { - BUG_ON(!T_TASK(cmd)); - BUG_ON(!CMD_TFO(cmd)); - - transport_free_se_cmd(cmd); - CMD_TFO(cmd)->release_cmd_to_pool(cmd); -} -EXPORT_SYMBOL(transport_release_cmd_to_pool); - -/* transport_generic_free_cmd(): - * - * Called from processing frontend to release storage engine resources - */ -void transport_generic_free_cmd( - struct se_cmd *cmd, - int wait_for_tasks, - int release_to_pool, - int session_reinstatement) -{ - if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) || !T_TASK(cmd)) - transport_release_cmd_to_pool(cmd); - else { - core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd); - - if (SE_LUN(cmd)) { -#if 0 - printk(KERN_INFO "cmd: %p ITT: 0x%08x contains" - " SE_LUN(cmd)\n", cmd, - CMD_TFO(cmd)->get_task_tag(cmd)); -#endif - transport_lun_remove_cmd(cmd); - } + struct se_cmd *se_cmd, *tmp_cmd; + unsigned long flags; - if (wait_for_tasks && cmd->transport_wait_for_tasks) - cmd->transport_wait_for_tasks(cmd, 0, 0); + list_for_each_entry_safe(se_cmd, tmp_cmd, + &se_sess->sess_wait_list, se_cmd_list) { + list_del(&se_cmd->se_cmd_list); - transport_generic_remove(cmd, release_to_pool, - session_reinstatement); - } -} -EXPORT_SYMBOL(transport_generic_free_cmd); + pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" + " %d\n", se_cmd, se_cmd->t_state, + se_cmd->se_tfo->get_cmd_state(se_cmd)); -static void transport_nop_wait_for_tasks( - struct se_cmd *cmd, - int remove_cmd, - int session_reinstatement) -{ - return; -} + wait_for_completion(&se_cmd->cmd_wait_comp); + pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" + " fabric state: %d\n", se_cmd, se_cmd->t_state, + se_cmd->se_tfo->get_cmd_state(se_cmd)); -/* transport_lun_wait_for_tasks(): - * - * Called from ConfigFS context to stop the passed struct se_cmd to allow - * an struct se_lun to be successfully shutdown. - */ -static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun) -{ - unsigned long flags; - int ret; - /* - * If the frontend has already requested this struct se_cmd to - * be stopped, we can safely ignore this struct se_cmd. - */ - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - if (atomic_read(&T_TASK(cmd)->t_transport_stop)) { - atomic_set(&T_TASK(cmd)->transport_lun_stop, 0); - DEBUG_TRANSPORT_S("ConfigFS ITT[0x%08x] - t_transport_stop ==" - " TRUE, skipping\n", CMD_TFO(cmd)->get_task_tag(cmd)); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - transport_cmd_check_stop(cmd, 1, 0); - return -1; + se_cmd->se_tfo->release_cmd(se_cmd); } - atomic_set(&T_TASK(cmd)->transport_lun_fe_stop, 1); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - wake_up_interruptible(&SE_DEV(cmd)->dev_queue_obj->thread_wq); + spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); + WARN_ON(!list_empty(&se_sess->sess_cmd_list)); + spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); - ret = transport_stop_tasks_for_cmd(cmd); - - DEBUG_TRANSPORT_S("ConfigFS: cmd: %p t_task_cdbs: %d stop tasks ret:" - " %d\n", cmd, T_TASK(cmd)->t_task_cdbs, ret); - if (!ret) { - DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopping cmd....\n", - CMD_TFO(cmd)->get_task_tag(cmd)); - wait_for_completion(&T_TASK(cmd)->transport_lun_stop_comp); - DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopped cmd....\n", - CMD_TFO(cmd)->get_task_tag(cmd)); - } - transport_remove_cmd_from_queue(cmd, SE_DEV(cmd)->dev_queue_obj); - - return 0; } +EXPORT_SYMBOL(target_wait_for_sess_cmds); -/* #define DEBUG_CLEAR_LUN */ -#ifdef DEBUG_CLEAR_LUN -#define DEBUG_CLEAR_L(x...) printk(KERN_INFO x) -#else -#define DEBUG_CLEAR_L(x...) -#endif - -static void __transport_clear_lun_from_sessions(struct se_lun *lun) +static int transport_clear_lun_ref_thread(void *p) { - struct se_cmd *cmd = NULL; - unsigned long lun_flags, cmd_flags; - /* - * Do exception processing and return CHECK_CONDITION status to the - * Initiator Port. - */ - spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); - while (!list_empty_careful(&lun->lun_cmd_list)) { - cmd = list_entry(lun->lun_cmd_list.next, - struct se_cmd, se_lun_list); - list_del(&cmd->se_lun_list); - - if (!(T_TASK(cmd))) { - printk(KERN_ERR "ITT: 0x%08x, T_TASK(cmd) = NULL" - "[i,t]_state: %u/%u\n", - CMD_TFO(cmd)->get_task_tag(cmd), - CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state); - BUG(); - } - atomic_set(&T_TASK(cmd)->transport_lun_active, 0); - /* - * This will notify iscsi_target_transport.c: - * transport_cmd_check_stop() that a LUN shutdown is in - * progress for the iscsi_cmd_t. - */ - spin_lock(&T_TASK(cmd)->t_state_lock); - DEBUG_CLEAR_L("SE_LUN[%d] - Setting T_TASK(cmd)->transport" - "_lun_stop for ITT: 0x%08x\n", - SE_LUN(cmd)->unpacked_lun, - CMD_TFO(cmd)->get_task_tag(cmd)); - atomic_set(&T_TASK(cmd)->transport_lun_stop, 1); - spin_unlock(&T_TASK(cmd)->t_state_lock); - - spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); - - if (!(SE_LUN(cmd))) { - printk(KERN_ERR "ITT: 0x%08x, [i,t]_state: %u/%u\n", - CMD_TFO(cmd)->get_task_tag(cmd), - CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state); - BUG(); - } - /* - * If the Storage engine still owns the iscsi_cmd_t, determine - * and/or stop its context. - */ - DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x before transport" - "_lun_wait_for_tasks()\n", SE_LUN(cmd)->unpacked_lun, - CMD_TFO(cmd)->get_task_tag(cmd)); + struct se_lun *lun = p; - if (transport_lun_wait_for_tasks(cmd, SE_LUN(cmd)) < 0) { - spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); - continue; - } - - DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x after transport_lun" - "_wait_for_tasks(): SUCCESS\n", - SE_LUN(cmd)->unpacked_lun, - CMD_TFO(cmd)->get_task_tag(cmd)); - - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, cmd_flags); - if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) { - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, cmd_flags); - goto check_cond; - } - atomic_set(&T_TASK(cmd)->transport_dev_active, 0); - transport_all_task_dev_remove_state(cmd); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, cmd_flags); + percpu_ref_kill(&lun->lun_ref); - transport_free_dev_tasks(cmd); - /* - * The Storage engine stopped this struct se_cmd before it was - * send to the fabric frontend for delivery back to the - * Initiator Node. Return this SCSI CDB back with an - * CHECK_CONDITION status. - */ -check_cond: - transport_send_check_condition_and_sense(cmd, - TCM_NON_EXISTENT_LUN, 0); - /* - * If the fabric frontend is waiting for this iscsi_cmd_t to - * be released, notify the waiting thread now that LU has - * finished accessing it. - */ - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, cmd_flags); - if (atomic_read(&T_TASK(cmd)->transport_lun_fe_stop)) { - DEBUG_CLEAR_L("SE_LUN[%d] - Detected FE stop for" - " struct se_cmd: %p ITT: 0x%08x\n", - lun->unpacked_lun, - cmd, CMD_TFO(cmd)->get_task_tag(cmd)); - - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, - cmd_flags); - transport_cmd_check_stop(cmd, 1, 0); - complete(&T_TASK(cmd)->transport_lun_fe_stop_comp); - spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); - continue; - } - DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x finished processing\n", - lun->unpacked_lun, CMD_TFO(cmd)->get_task_tag(cmd)); - - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, cmd_flags); - spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); - } - spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); -} - -static int transport_clear_lun_thread(void *p) -{ - struct se_lun *lun = (struct se_lun *)p; - - __transport_clear_lun_from_sessions(lun); + wait_for_completion(&lun->lun_ref_comp); complete(&lun->lun_shutdown_comp); return 0; } -int transport_clear_lun_from_sessions(struct se_lun *lun) +int transport_clear_lun_ref(struct se_lun *lun) { struct task_struct *kt; - kt = kthread_run(transport_clear_lun_thread, (void *)lun, + kt = kthread_run(transport_clear_lun_ref_thread, lun, "tcm_cl_%u", lun->unpacked_lun); if (IS_ERR(kt)) { - printk(KERN_ERR "Unable to start clear_lun thread\n"); - return -1; + pr_err("Unable to start clear_lun thread\n"); + return PTR_ERR(kt); } wait_for_completion(&lun->lun_shutdown_comp); return 0; } -/* transport_generic_wait_for_tasks(): +/** + * transport_wait_for_tasks - wait for completion to occur + * @cmd: command to wait * - * Called from frontend or passthrough context to wait for storage engine - * to pause and/or release frontend generated struct se_cmd. + * Called from frontend fabric context to wait for storage engine + * to pause and/or release frontend generated struct se_cmd. */ -static void transport_generic_wait_for_tasks( - struct se_cmd *cmd, - int remove_cmd, - int session_reinstatement) +bool transport_wait_for_tasks(struct se_cmd *cmd) { unsigned long flags; - if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) - return; - - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - /* - * If we are already stopped due to an external event (ie: LUN shutdown) - * sleep until the connection can have the passed struct se_cmd back. - * The T_TASK(cmd)->transport_lun_stopped_sem will be upped by - * transport_clear_lun_from_sessions() once the ConfigFS context caller - * has completed its operation on the struct se_cmd. - */ - if (atomic_read(&T_TASK(cmd)->transport_lun_stop)) { - - DEBUG_TRANSPORT_S("wait_for_tasks: Stopping" - " wait_for_completion(&T_TASK(cmd)transport_lun_fe" - "_stop_comp); for ITT: 0x%08x\n", - CMD_TFO(cmd)->get_task_tag(cmd)); - /* - * There is a special case for WRITES where a FE exception + - * LUN shutdown means ConfigFS context is still sleeping on - * transport_lun_stop_comp in transport_lun_wait_for_tasks(). - * We go ahead and up transport_lun_stop_comp just to be sure - * here. - */ - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - complete(&T_TASK(cmd)->transport_lun_stop_comp); - wait_for_completion(&T_TASK(cmd)->transport_lun_fe_stop_comp); - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); + spin_lock_irqsave(&cmd->t_state_lock, flags); + if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && + !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { + spin_unlock_irqrestore(&cmd->t_state_lock, flags); + return false; + } - transport_all_task_dev_remove_state(cmd); - /* - * At this point, the frontend who was the originator of this - * struct se_cmd, now owns the structure and can be released through - * normal means below. - */ - DEBUG_TRANSPORT_S("wait_for_tasks: Stopped" - " wait_for_completion(&T_TASK(cmd)transport_lun_fe_" - "stop_comp); for ITT: 0x%08x\n", - CMD_TFO(cmd)->get_task_tag(cmd)); + if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && + !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { + spin_unlock_irqrestore(&cmd->t_state_lock, flags); + return false; + } - atomic_set(&T_TASK(cmd)->transport_lun_stop, 0); + if (!(cmd->transport_state & CMD_T_ACTIVE)) { + spin_unlock_irqrestore(&cmd->t_state_lock, flags); + return false; } - if (!atomic_read(&T_TASK(cmd)->t_transport_active)) - goto remove; - atomic_set(&T_TASK(cmd)->t_transport_stop, 1); + cmd->transport_state |= CMD_T_STOP; - DEBUG_TRANSPORT_S("wait_for_tasks: Stopping %p ITT: 0x%08x" - " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop" - " = TRUE\n", cmd, CMD_TFO(cmd)->get_task_tag(cmd), - CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state, - cmd->deferred_t_state); + pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x" + " i_state: %d, t_state: %d, CMD_T_STOP\n", + cmd, cmd->se_tfo->get_task_tag(cmd), + cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); + spin_unlock_irqrestore(&cmd->t_state_lock, flags); - wake_up_interruptible(&SE_DEV(cmd)->dev_queue_obj->thread_wq); + wait_for_completion(&cmd->t_transport_stop_comp); - wait_for_completion(&T_TASK(cmd)->t_transport_stop_comp); + spin_lock_irqsave(&cmd->t_state_lock, flags); + cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - atomic_set(&T_TASK(cmd)->t_transport_active, 0); - atomic_set(&T_TASK(cmd)->t_transport_stop, 0); + pr_debug("wait_for_tasks: Stopped wait_for_completion(" + "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n", + cmd->se_tfo->get_task_tag(cmd)); - DEBUG_TRANSPORT_S("wait_for_tasks: Stopped wait_for_compltion(" - "&T_TASK(cmd)->t_transport_stop_comp) for ITT: 0x%08x\n", - CMD_TFO(cmd)->get_task_tag(cmd)); -remove: - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); - if (!remove_cmd) - return; + spin_unlock_irqrestore(&cmd->t_state_lock, flags); - transport_generic_free_cmd(cmd, 0, 0, session_reinstatement); + return true; } +EXPORT_SYMBOL(transport_wait_for_tasks); static int transport_get_sense_codes( struct se_cmd *cmd, @@ -5592,170 +2580,259 @@ static int transport_get_sense_codes( return 0; } -static int transport_set_sense_codes( - struct se_cmd *cmd, - u8 asc, - u8 ascq) +static +void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector) { - cmd->scsi_asc = asc; - cmd->scsi_ascq = ascq; + /* Place failed LBA in sense data information descriptor 0. */ + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc; + buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */ + buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa; + buffer[SPC_VALIDITY_OFFSET] = 0x80; - return 0; + /* Descriptor Information: failing sector */ + put_unaligned_be64(bad_sector, &buffer[12]); } -int transport_send_check_condition_and_sense( - struct se_cmd *cmd, - u8 reason, - int from_transport) +int +transport_send_check_condition_and_sense(struct se_cmd *cmd, + sense_reason_t reason, int from_transport) { unsigned char *buffer = cmd->sense_buffer; unsigned long flags; - int offset; u8 asc = 0, ascq = 0; - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); + spin_lock_irqsave(&cmd->t_state_lock, flags); if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); + spin_unlock_irqrestore(&cmd->t_state_lock, flags); return 0; } cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; - spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); + spin_unlock_irqrestore(&cmd->t_state_lock, flags); if (!reason && from_transport) goto after_reason; if (!from_transport) cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; - /* - * Data Segment and SenseLength of the fabric response PDU. - * - * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE - * from include/scsi/scsi_cmnd.h - */ - offset = CMD_TFO(cmd)->set_fabric_sense_len(cmd, - TRANSPORT_SENSE_BUFFER); + /* * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses * SENSE KEY values from include/scsi/scsi.h */ switch (reason) { + case TCM_NO_SENSE: + /* CURRENT ERROR */ + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; + /* Not Ready */ + buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY; + /* NO ADDITIONAL SENSE INFORMATION */ + buffer[SPC_ASC_KEY_OFFSET] = 0; + buffer[SPC_ASCQ_KEY_OFFSET] = 0; + break; case TCM_NON_EXISTENT_LUN: + /* CURRENT ERROR */ + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; + /* ILLEGAL REQUEST */ + buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; + /* LOGICAL UNIT NOT SUPPORTED */ + buffer[SPC_ASC_KEY_OFFSET] = 0x25; + break; case TCM_UNSUPPORTED_SCSI_OPCODE: case TCM_SECTOR_COUNT_TOO_MANY: /* CURRENT ERROR */ - buffer[offset] = 0x70; + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; /* ILLEGAL REQUEST */ - buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; + buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; /* INVALID COMMAND OPERATION CODE */ - buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20; + buffer[SPC_ASC_KEY_OFFSET] = 0x20; break; case TCM_UNKNOWN_MODE_PAGE: /* CURRENT ERROR */ - buffer[offset] = 0x70; + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; /* ILLEGAL REQUEST */ - buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; + buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; /* INVALID FIELD IN CDB */ - buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; + buffer[SPC_ASC_KEY_OFFSET] = 0x24; break; case TCM_CHECK_CONDITION_ABORT_CMD: /* CURRENT ERROR */ - buffer[offset] = 0x70; + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; /* ABORTED COMMAND */ - buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; + buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; /* BUS DEVICE RESET FUNCTION OCCURRED */ - buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29; - buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03; + buffer[SPC_ASC_KEY_OFFSET] = 0x29; + buffer[SPC_ASCQ_KEY_OFFSET] = 0x03; break; case TCM_INCORRECT_AMOUNT_OF_DATA: /* CURRENT ERROR */ - buffer[offset] = 0x70; + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; /* ABORTED COMMAND */ - buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; + buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; /* WRITE ERROR */ - buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; + buffer[SPC_ASC_KEY_OFFSET] = 0x0c; /* NOT ENOUGH UNSOLICITED DATA */ - buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d; + buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d; break; case TCM_INVALID_CDB_FIELD: /* CURRENT ERROR */ - buffer[offset] = 0x70; - /* ABORTED COMMAND */ - buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; + /* ILLEGAL REQUEST */ + buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; /* INVALID FIELD IN CDB */ - buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; + buffer[SPC_ASC_KEY_OFFSET] = 0x24; break; case TCM_INVALID_PARAMETER_LIST: /* CURRENT ERROR */ - buffer[offset] = 0x70; - /* ABORTED COMMAND */ - buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; + /* ILLEGAL REQUEST */ + buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; /* INVALID FIELD IN PARAMETER LIST */ - buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26; + buffer[SPC_ASC_KEY_OFFSET] = 0x26; + break; + case TCM_PARAMETER_LIST_LENGTH_ERROR: + /* CURRENT ERROR */ + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; + /* ILLEGAL REQUEST */ + buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; + /* PARAMETER LIST LENGTH ERROR */ + buffer[SPC_ASC_KEY_OFFSET] = 0x1a; break; case TCM_UNEXPECTED_UNSOLICITED_DATA: /* CURRENT ERROR */ - buffer[offset] = 0x70; + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; /* ABORTED COMMAND */ - buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; + buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; /* WRITE ERROR */ - buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; + buffer[SPC_ASC_KEY_OFFSET] = 0x0c; /* UNEXPECTED_UNSOLICITED_DATA */ - buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c; + buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c; break; case TCM_SERVICE_CRC_ERROR: /* CURRENT ERROR */ - buffer[offset] = 0x70; + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; /* ABORTED COMMAND */ - buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; + buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; /* PROTOCOL SERVICE CRC ERROR */ - buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47; + buffer[SPC_ASC_KEY_OFFSET] = 0x47; /* N/A */ - buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05; + buffer[SPC_ASCQ_KEY_OFFSET] = 0x05; break; case TCM_SNACK_REJECTED: /* CURRENT ERROR */ - buffer[offset] = 0x70; + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; /* ABORTED COMMAND */ - buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; + buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; /* READ ERROR */ - buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11; + buffer[SPC_ASC_KEY_OFFSET] = 0x11; /* FAILED RETRANSMISSION REQUEST */ - buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13; + buffer[SPC_ASCQ_KEY_OFFSET] = 0x13; break; case TCM_WRITE_PROTECTED: /* CURRENT ERROR */ - buffer[offset] = 0x70; + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; /* DATA PROTECT */ - buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; + buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; /* WRITE PROTECTED */ - buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27; + buffer[SPC_ASC_KEY_OFFSET] = 0x27; + break; + case TCM_ADDRESS_OUT_OF_RANGE: + /* CURRENT ERROR */ + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; + /* ILLEGAL REQUEST */ + buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; + /* LOGICAL BLOCK ADDRESS OUT OF RANGE */ + buffer[SPC_ASC_KEY_OFFSET] = 0x21; break; case TCM_CHECK_CONDITION_UNIT_ATTENTION: /* CURRENT ERROR */ - buffer[offset] = 0x70; + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; /* UNIT ATTENTION */ - buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; + buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); - buffer[offset+SPC_ASC_KEY_OFFSET] = asc; - buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; + buffer[SPC_ASC_KEY_OFFSET] = asc; + buffer[SPC_ASCQ_KEY_OFFSET] = ascq; break; case TCM_CHECK_CONDITION_NOT_READY: /* CURRENT ERROR */ - buffer[offset] = 0x70; + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; /* Not Ready */ - buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY; + buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY; transport_get_sense_codes(cmd, &asc, &ascq); - buffer[offset+SPC_ASC_KEY_OFFSET] = asc; - buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; + buffer[SPC_ASC_KEY_OFFSET] = asc; + buffer[SPC_ASCQ_KEY_OFFSET] = ascq; + break; + case TCM_MISCOMPARE_VERIFY: + /* CURRENT ERROR */ + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; + buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE; + /* MISCOMPARE DURING VERIFY OPERATION */ + buffer[SPC_ASC_KEY_OFFSET] = 0x1d; + buffer[SPC_ASCQ_KEY_OFFSET] = 0x00; + break; + case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED: + /* CURRENT ERROR */ + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; + /* ILLEGAL REQUEST */ + buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; + /* LOGICAL BLOCK GUARD CHECK FAILED */ + buffer[SPC_ASC_KEY_OFFSET] = 0x10; + buffer[SPC_ASCQ_KEY_OFFSET] = 0x01; + transport_err_sector_info(buffer, cmd->bad_sector); + break; + case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED: + /* CURRENT ERROR */ + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; + /* ILLEGAL REQUEST */ + buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; + /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */ + buffer[SPC_ASC_KEY_OFFSET] = 0x10; + buffer[SPC_ASCQ_KEY_OFFSET] = 0x02; + transport_err_sector_info(buffer, cmd->bad_sector); + break; + case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED: + /* CURRENT ERROR */ + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; + /* ILLEGAL REQUEST */ + buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; + /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */ + buffer[SPC_ASC_KEY_OFFSET] = 0x10; + buffer[SPC_ASCQ_KEY_OFFSET] = 0x03; + transport_err_sector_info(buffer, cmd->bad_sector); break; case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: default: /* CURRENT ERROR */ - buffer[offset] = 0x70; - /* ILLEGAL REQUEST */ - buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; + buffer[0] = 0x70; + buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; + /* + * Returning ILLEGAL REQUEST would cause immediate IO errors on + * Solaris initiators. Returning NOT READY instead means the + * operations will be retried a finite number of times and we + * can survive intermittent errors. + */ + buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY; /* LOGICAL UNIT COMMUNICATION FAILURE */ - buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80; + buffer[SPC_ASC_KEY_OFFSET] = 0x08; break; } /* @@ -5766,38 +2843,49 @@ int transport_send_check_condition_and_sense( * Automatically padded, this value is encoded in the fabric's * data_length response PDU containing the SCSI defined sense data. */ - cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; + cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; after_reason: - CMD_TFO(cmd)->queue_status(cmd); - return 0; + trace_target_cmd_complete(cmd); + return cmd->se_tfo->queue_status(cmd); } EXPORT_SYMBOL(transport_send_check_condition_and_sense); int transport_check_aborted_status(struct se_cmd *cmd, int send_status) { - int ret = 0; + if (!(cmd->transport_state & CMD_T_ABORTED)) + return 0; - if (atomic_read(&T_TASK(cmd)->t_transport_aborted) != 0) { - if (!(send_status) || - (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS)) - return 1; -#if 0 - printk(KERN_INFO "Sending delayed SAM_STAT_TASK_ABORTED" - " status for CDB: 0x%02x ITT: 0x%08x\n", - T_TASK(cmd)->t_task_cdb[0], - CMD_TFO(cmd)->get_task_tag(cmd)); -#endif - cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS; - CMD_TFO(cmd)->queue_status(cmd); - ret = 1; - } - return ret; + /* + * If cmd has been aborted but either no status is to be sent or it has + * already been sent, just return + */ + if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) + return 1; + + pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n", + cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd)); + + cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS; + cmd->scsi_status = SAM_STAT_TASK_ABORTED; + trace_target_cmd_complete(cmd); + cmd->se_tfo->queue_status(cmd); + + return 1; } EXPORT_SYMBOL(transport_check_aborted_status); void transport_send_task_abort(struct se_cmd *cmd) { + unsigned long flags; + + spin_lock_irqsave(&cmd->t_state_lock, flags); + if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) { + spin_unlock_irqrestore(&cmd->t_state_lock, flags); + return; + } + spin_unlock_irqrestore(&cmd->t_state_lock, flags); + /* * If there are still expected incoming fabric WRITEs, we wait * until until they have completed before sending a TASK_ABORTED @@ -5805,360 +2893,76 @@ void transport_send_task_abort(struct se_cmd *cmd) * queued back to fabric module by transport_check_aborted_status(). */ if (cmd->data_direction == DMA_TO_DEVICE) { - if (CMD_TFO(cmd)->write_pending_status(cmd) != 0) { - atomic_inc(&T_TASK(cmd)->t_transport_aborted); - smp_mb__after_atomic_inc(); - cmd->scsi_status = SAM_STAT_TASK_ABORTED; - transport_new_cmd_failure(cmd); + if (cmd->se_tfo->write_pending_status(cmd) != 0) { + cmd->transport_state |= CMD_T_ABORTED; + cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS; + smp_mb__after_atomic(); return; } } cmd->scsi_status = SAM_STAT_TASK_ABORTED; -#if 0 - printk(KERN_INFO "Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," - " ITT: 0x%08x\n", T_TASK(cmd)->t_task_cdb[0], - CMD_TFO(cmd)->get_task_tag(cmd)); -#endif - CMD_TFO(cmd)->queue_status(cmd); + + transport_lun_remove_cmd(cmd); + + pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," + " ITT: 0x%08x\n", cmd->t_task_cdb[0], + cmd->se_tfo->get_task_tag(cmd)); + + trace_target_cmd_complete(cmd); + cmd->se_tfo->queue_status(cmd); } -/* transport_generic_do_tmr(): - * - * - */ -int transport_generic_do_tmr(struct se_cmd *cmd) +static void target_tmr_work(struct work_struct *work) { - struct se_cmd *ref_cmd; - struct se_device *dev = SE_DEV(cmd); + struct se_cmd *cmd = container_of(work, struct se_cmd, work); + struct se_device *dev = cmd->se_dev; struct se_tmr_req *tmr = cmd->se_tmr_req; int ret; switch (tmr->function) { - case ABORT_TASK: - ref_cmd = tmr->ref_cmd; - tmr->response = TMR_FUNCTION_REJECTED; + case TMR_ABORT_TASK: + core_tmr_abort_task(dev, tmr, cmd->se_sess); break; - case ABORT_TASK_SET: - case CLEAR_ACA: - case CLEAR_TASK_SET: + case TMR_ABORT_TASK_SET: + case TMR_CLEAR_ACA: + case TMR_CLEAR_TASK_SET: tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; break; - case LUN_RESET: + case TMR_LUN_RESET: ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : TMR_FUNCTION_REJECTED; break; -#if 0 - case TARGET_WARM_RESET: - transport_generic_host_reset(dev->se_hba); + case TMR_TARGET_WARM_RESET: tmr->response = TMR_FUNCTION_REJECTED; break; - case TARGET_COLD_RESET: - transport_generic_host_reset(dev->se_hba); - transport_generic_cold_reset(dev->se_hba); + case TMR_TARGET_COLD_RESET: tmr->response = TMR_FUNCTION_REJECTED; break; -#endif default: - printk(KERN_ERR "Uknown TMR function: 0x%02x.\n", + pr_err("Uknown TMR function: 0x%02x.\n", tmr->function); tmr->response = TMR_FUNCTION_REJECTED; break; } cmd->t_state = TRANSPORT_ISTATE_PROCESSING; - CMD_TFO(cmd)->queue_tm_rsp(cmd); - - transport_cmd_check_stop(cmd, 2, 0); - return 0; -} - -/* - * Called with spin_lock_irq(&dev->execute_task_lock); held - * - */ -static struct se_task * -transport_get_task_from_state_list(struct se_device *dev) -{ - struct se_task *task; + cmd->se_tfo->queue_tm_rsp(cmd); - if (list_empty(&dev->state_task_list)) - return NULL; - - list_for_each_entry(task, &dev->state_task_list, t_state_list) - break; - - list_del(&task->t_state_list); - atomic_set(&task->task_state_active, 0); - - return task; + transport_cmd_check_stop_to_fabric(cmd); } -static void transport_processing_shutdown(struct se_device *dev) +int transport_generic_handle_tmr( + struct se_cmd *cmd) { - struct se_cmd *cmd; - struct se_queue_req *qr; - struct se_task *task; - u8 state; unsigned long flags; - /* - * Empty the struct se_device's struct se_task state list. - */ - spin_lock_irqsave(&dev->execute_task_lock, flags); - while ((task = transport_get_task_from_state_list(dev))) { - if (!(TASK_CMD(task))) { - printk(KERN_ERR "TASK_CMD(task) is NULL!\n"); - continue; - } - cmd = TASK_CMD(task); - if (!T_TASK(cmd)) { - printk(KERN_ERR "T_TASK(cmd) is NULL for task: %p cmd:" - " %p ITT: 0x%08x\n", task, cmd, - CMD_TFO(cmd)->get_task_tag(cmd)); - continue; - } - spin_unlock_irqrestore(&dev->execute_task_lock, flags); - - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - - DEBUG_DO("PT: cmd: %p task: %p ITT/CmdSN: 0x%08x/0x%08x," - " i_state/def_i_state: %d/%d, t_state/def_t_state:" - " %d/%d cdb: 0x%02x\n", cmd, task, - CMD_TFO(cmd)->get_task_tag(cmd), cmd->cmd_sn, - CMD_TFO(cmd)->get_cmd_state(cmd), cmd->deferred_i_state, - cmd->t_state, cmd->deferred_t_state, - T_TASK(cmd)->t_task_cdb[0]); - DEBUG_DO("PT: ITT[0x%08x] - t_task_cdbs: %d t_task_cdbs_left:" - " %d t_task_cdbs_sent: %d -- t_transport_active: %d" - " t_transport_stop: %d t_transport_sent: %d\n", - CMD_TFO(cmd)->get_task_tag(cmd), - T_TASK(cmd)->t_task_cdbs, - atomic_read(&T_TASK(cmd)->t_task_cdbs_left), - atomic_read(&T_TASK(cmd)->t_task_cdbs_sent), - atomic_read(&T_TASK(cmd)->t_transport_active), - atomic_read(&T_TASK(cmd)->t_transport_stop), - atomic_read(&T_TASK(cmd)->t_transport_sent)); - - if (atomic_read(&task->task_active)) { - atomic_set(&task->task_stop, 1); - spin_unlock_irqrestore( - &T_TASK(cmd)->t_state_lock, flags); - - DEBUG_DO("Waiting for task: %p to shutdown for dev:" - " %p\n", task, dev); - wait_for_completion(&task->task_stop_comp); - DEBUG_DO("Completed task: %p shutdown for dev: %p\n", - task, dev); - - spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); - atomic_dec(&T_TASK(cmd)->t_task_cdbs_left); - - atomic_set(&task->task_active, 0); - atomic_set(&task->task_stop, 0); - } - __transport_stop_task_timer(task, &flags); - - if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_ex_left))) { - spin_unlock_irqrestore( - &T_TASK(cmd)->t_state_lock, flags); - - DEBUG_DO("Skipping task: %p, dev: %p for" - " t_task_cdbs_ex_left: %d\n", task, dev, - atomic_read(&T_TASK(cmd)->t_task_cdbs_ex_left)); - - spin_lock_irqsave(&dev->execute_task_lock, flags); - continue; - } - - if (atomic_read(&T_TASK(cmd)->t_transport_active)) { - DEBUG_DO("got t_transport_active = 1 for task: %p, dev:" - " %p\n", task, dev); - - if (atomic_read(&T_TASK(cmd)->t_fe_count)) { - spin_unlock_irqrestore( - &T_TASK(cmd)->t_state_lock, flags); - transport_send_check_condition_and_sense( - cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, - 0); - transport_remove_cmd_from_queue(cmd, - SE_DEV(cmd)->dev_queue_obj); - - transport_lun_remove_cmd(cmd); - transport_cmd_check_stop(cmd, 1, 0); - } else { - spin_unlock_irqrestore( - &T_TASK(cmd)->t_state_lock, flags); - - transport_remove_cmd_from_queue(cmd, - SE_DEV(cmd)->dev_queue_obj); - - transport_lun_remove_cmd(cmd); - - if (transport_cmd_check_stop(cmd, 1, 0)) - transport_generic_remove(cmd, 0, 0); - } - - spin_lock_irqsave(&dev->execute_task_lock, flags); - continue; - } - DEBUG_DO("Got t_transport_active = 0 for task: %p, dev: %p\n", - task, dev); + spin_lock_irqsave(&cmd->t_state_lock, flags); + cmd->transport_state |= CMD_T_ACTIVE; + spin_unlock_irqrestore(&cmd->t_state_lock, flags); - if (atomic_read(&T_TASK(cmd)->t_fe_count)) { - spin_unlock_irqrestore( - &T_TASK(cmd)->t_state_lock, flags); - transport_send_check_condition_and_sense(cmd, - TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); - transport_remove_cmd_from_queue(cmd, - SE_DEV(cmd)->dev_queue_obj); - - transport_lun_remove_cmd(cmd); - transport_cmd_check_stop(cmd, 1, 0); - } else { - spin_unlock_irqrestore( - &T_TASK(cmd)->t_state_lock, flags); - - transport_remove_cmd_from_queue(cmd, - SE_DEV(cmd)->dev_queue_obj); - transport_lun_remove_cmd(cmd); - - if (transport_cmd_check_stop(cmd, 1, 0)) - transport_generic_remove(cmd, 0, 0); - } - - spin_lock_irqsave(&dev->execute_task_lock, flags); - } - spin_unlock_irqrestore(&dev->execute_task_lock, flags); - /* - * Empty the struct se_device's struct se_cmd list. - */ - spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags); - while ((qr = __transport_get_qr_from_queue(dev->dev_queue_obj))) { - spin_unlock_irqrestore( - &dev->dev_queue_obj->cmd_queue_lock, flags); - cmd = (struct se_cmd *)qr->cmd; - state = qr->state; - kfree(qr); - - DEBUG_DO("From Device Queue: cmd: %p t_state: %d\n", - cmd, state); - - if (atomic_read(&T_TASK(cmd)->t_fe_count)) { - transport_send_check_condition_and_sense(cmd, - TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); - - transport_lun_remove_cmd(cmd); - transport_cmd_check_stop(cmd, 1, 0); - } else { - transport_lun_remove_cmd(cmd); - if (transport_cmd_check_stop(cmd, 1, 0)) - transport_generic_remove(cmd, 0, 0); - } - spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags); - } - spin_unlock_irqrestore(&dev->dev_queue_obj->cmd_queue_lock, flags); -} - -/* transport_processing_thread(): - * - * - */ -static int transport_processing_thread(void *param) -{ - int ret, t_state; - struct se_cmd *cmd; - struct se_device *dev = (struct se_device *) param; - struct se_queue_req *qr; - - set_user_nice(current, -20); - - while (!kthread_should_stop()) { - ret = wait_event_interruptible(dev->dev_queue_obj->thread_wq, - atomic_read(&dev->dev_queue_obj->queue_cnt) || - kthread_should_stop()); - if (ret < 0) - goto out; - - spin_lock_irq(&dev->dev_status_lock); - if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) { - spin_unlock_irq(&dev->dev_status_lock); - transport_processing_shutdown(dev); - continue; - } - spin_unlock_irq(&dev->dev_status_lock); - -get_cmd: - __transport_execute_tasks(dev); - - qr = transport_get_qr_from_queue(dev->dev_queue_obj); - if (!(qr)) - continue; - - cmd = (struct se_cmd *)qr->cmd; - t_state = qr->state; - kfree(qr); - - switch (t_state) { - case TRANSPORT_NEW_CMD_MAP: - if (!(CMD_TFO(cmd)->new_cmd_map)) { - printk(KERN_ERR "CMD_TFO(cmd)->new_cmd_map is" - " NULL for TRANSPORT_NEW_CMD_MAP\n"); - BUG(); - } - ret = CMD_TFO(cmd)->new_cmd_map(cmd); - if (ret < 0) { - cmd->transport_error_status = ret; - transport_generic_request_failure(cmd, NULL, - 0, (cmd->data_direction != - DMA_TO_DEVICE)); - break; - } - /* Fall through */ - case TRANSPORT_NEW_CMD: - ret = transport_generic_new_cmd(cmd); - if (ret < 0) { - cmd->transport_error_status = ret; - transport_generic_request_failure(cmd, NULL, - 0, (cmd->data_direction != - DMA_TO_DEVICE)); - } - break; - case TRANSPORT_PROCESS_WRITE: - transport_generic_process_write(cmd); - break; - case TRANSPORT_COMPLETE_OK: - transport_stop_all_task_timers(cmd); - transport_generic_complete_ok(cmd); - break; - case TRANSPORT_REMOVE: - transport_generic_remove(cmd, 1, 0); - break; - case TRANSPORT_PROCESS_TMR: - transport_generic_do_tmr(cmd); - break; - case TRANSPORT_COMPLETE_FAILURE: - transport_generic_request_failure(cmd, NULL, 1, 1); - break; - case TRANSPORT_COMPLETE_TIMEOUT: - transport_stop_all_task_timers(cmd); - transport_generic_request_timeout(cmd); - break; - default: - printk(KERN_ERR "Unknown t_state: %d deferred_t_state:" - " %d for ITT: 0x%08x i_state: %d on SE LUN:" - " %u\n", t_state, cmd->deferred_t_state, - CMD_TFO(cmd)->get_task_tag(cmd), - CMD_TFO(cmd)->get_cmd_state(cmd), - SE_LUN(cmd)->unpacked_lun); - BUG(); - } - - goto get_cmd; - } - -out: - transport_release_all_cmds(dev); - dev->process_thread = NULL; + INIT_WORK(&cmd->work, target_tmr_work); + queue_work(cmd->se_dev->tmr_wq, &cmd->work); return 0; } +EXPORT_SYMBOL(transport_generic_handle_tmr); |