diff options
Diffstat (limited to 'drivers/target/loopback/tcm_loop.c')
| -rw-r--r-- | drivers/target/loopback/tcm_loop.c | 1611 |
1 files changed, 1611 insertions, 0 deletions
diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c new file mode 100644 index 00000000000..8c64b8776a9 --- /dev/null +++ b/drivers/target/loopback/tcm_loop.c @@ -0,0 +1,1611 @@ +/******************************************************************************* + * + * This file contains the Linux/SCSI LLD virtual SCSI initiator driver + * for emulated SAS initiator ports + * + * © Copyright 2011-2013 Datera, Inc. + * + * Licensed to the Linux Foundation under the General Public License (GPL) version 2. + * + * Author: Nicholas A. Bellinger <nab@risingtidesystems.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + ****************************************************************************/ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/configfs.h> +#include <scsi/scsi.h> +#include <scsi/scsi_tcq.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_cmnd.h> + +#include <target/target_core_base.h> +#include <target/target_core_fabric.h> +#include <target/target_core_fabric_configfs.h> +#include <target/target_core_configfs.h> + +#include "tcm_loop.h" + +#define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev) + +/* Local pointer to allocated TCM configfs fabric module */ +static struct target_fabric_configfs *tcm_loop_fabric_configfs; + +static struct workqueue_struct *tcm_loop_workqueue; +static struct kmem_cache *tcm_loop_cmd_cache; + +static int tcm_loop_hba_no_cnt; + +static int tcm_loop_queue_status(struct se_cmd *se_cmd); + +/* + * Called from struct target_core_fabric_ops->check_stop_free() + */ +static int tcm_loop_check_stop_free(struct se_cmd *se_cmd) +{ + /* + * Do not release struct se_cmd's containing a valid TMR + * pointer. These will be released directly in tcm_loop_device_reset() + * with transport_generic_free_cmd(). + */ + if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) + return 0; + /* + * Release the struct se_cmd, which will make a callback to release + * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd() + */ + transport_generic_free_cmd(se_cmd, 0); + return 1; +} + +static void tcm_loop_release_cmd(struct se_cmd *se_cmd) +{ + struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, + struct tcm_loop_cmd, tl_se_cmd); + + kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); +} + +static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host) +{ + seq_printf(m, "tcm_loop_proc_info()\n"); + return 0; +} + +static int tcm_loop_driver_probe(struct device *); +static int tcm_loop_driver_remove(struct device *); + +static int pseudo_lld_bus_match(struct device *dev, + struct device_driver *dev_driver) +{ + return 1; +} + +static struct bus_type tcm_loop_lld_bus = { + .name = "tcm_loop_bus", + .match = pseudo_lld_bus_match, + .probe = tcm_loop_driver_probe, + .remove = tcm_loop_driver_remove, +}; + +static struct device_driver tcm_loop_driverfs = { + .name = "tcm_loop", + .bus = &tcm_loop_lld_bus, +}; +/* + * Used with root_device_register() in tcm_loop_alloc_core_bus() below + */ +struct device *tcm_loop_primary; + +/* + * Copied from drivers/scsi/libfc/fc_fcp.c:fc_change_queue_depth() and + * drivers/scsi/libiscsi.c:iscsi_change_queue_depth() + */ +static int tcm_loop_change_queue_depth( + struct scsi_device *sdev, + int depth, + int reason) +{ + switch (reason) { + case SCSI_QDEPTH_DEFAULT: + scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); + break; + case SCSI_QDEPTH_QFULL: + scsi_track_queue_full(sdev, depth); + break; + case SCSI_QDEPTH_RAMP_UP: + scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); + break; + default: + return -EOPNOTSUPP; + } + return sdev->queue_depth; +} + +static int tcm_loop_change_queue_type(struct scsi_device *sdev, int tag) +{ + if (sdev->tagged_supported) { + scsi_set_tag_type(sdev, tag); + + if (tag) + scsi_activate_tcq(sdev, sdev->queue_depth); + else + scsi_deactivate_tcq(sdev, sdev->queue_depth); + } else + tag = 0; + + return tag; +} + +/* + * Locate the SAM Task Attr from struct scsi_cmnd * + */ +static int tcm_loop_sam_attr(struct scsi_cmnd *sc) +{ + if (sc->device->tagged_supported) { + switch (sc->tag) { + case HEAD_OF_QUEUE_TAG: + return MSG_HEAD_TAG; + case ORDERED_QUEUE_TAG: + return MSG_ORDERED_TAG; + default: + break; + } + } + + return MSG_SIMPLE_TAG; +} + +static void tcm_loop_submission_work(struct work_struct *work) +{ + struct tcm_loop_cmd *tl_cmd = + container_of(work, struct tcm_loop_cmd, work); + struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd; + struct scsi_cmnd *sc = tl_cmd->sc; + struct tcm_loop_nexus *tl_nexus; + struct tcm_loop_hba *tl_hba; + struct tcm_loop_tpg *tl_tpg; + struct scatterlist *sgl_bidi = NULL; + u32 sgl_bidi_count = 0, transfer_length; + int rc; + + tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); + tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; + + /* + * Ensure that this tl_tpg reference from the incoming sc->device->id + * has already been configured via tcm_loop_make_naa_tpg(). + */ + if (!tl_tpg->tl_hba) { + set_host_byte(sc, DID_NO_CONNECT); + goto out_done; + } + if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) { + set_host_byte(sc, DID_TRANSPORT_DISRUPTED); + goto out_done; + } + tl_nexus = tl_hba->tl_nexus; + if (!tl_nexus) { + scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus" + " does not exist\n"); + set_host_byte(sc, DID_ERROR); + goto out_done; + } + if (scsi_bidi_cmnd(sc)) { + struct scsi_data_buffer *sdb = scsi_in(sc); + + sgl_bidi = sdb->table.sgl; + sgl_bidi_count = sdb->table.nents; + se_cmd->se_cmd_flags |= SCF_BIDI; + + } + + transfer_length = scsi_transfer_length(sc); + if (!scsi_prot_sg_count(sc) && + scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) { + se_cmd->prot_pto = true; + /* + * loopback transport doesn't support + * WRITE_GENERATE, READ_STRIP protection + * information operations, go ahead unprotected. + */ + transfer_length = scsi_bufflen(sc); + } + + rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd, + &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun, + transfer_length, tcm_loop_sam_attr(sc), + sc->sc_data_direction, 0, + scsi_sglist(sc), scsi_sg_count(sc), + sgl_bidi, sgl_bidi_count, + scsi_prot_sglist(sc), scsi_prot_sg_count(sc)); + if (rc < 0) { + set_host_byte(sc, DID_NO_CONNECT); + goto out_done; + } + return; + +out_done: + kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); + sc->scsi_done(sc); + return; +} + +/* + * ->queuecommand can be and usually is called from interrupt context, so + * defer the actual submission to a workqueue. + */ +static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc) +{ + struct tcm_loop_cmd *tl_cmd; + + pr_debug("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x" + " scsi_buf_len: %u\n", sc->device->host->host_no, + sc->device->id, sc->device->channel, sc->device->lun, + sc->cmnd[0], scsi_bufflen(sc)); + + tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC); + if (!tl_cmd) { + pr_err("Unable to allocate struct tcm_loop_cmd\n"); + set_host_byte(sc, DID_ERROR); + sc->scsi_done(sc); + return 0; + } + + tl_cmd->sc = sc; + tl_cmd->sc_cmd_tag = sc->tag; + INIT_WORK(&tl_cmd->work, tcm_loop_submission_work); + queue_work(tcm_loop_workqueue, &tl_cmd->work); + return 0; +} + +/* + * Called from SCSI EH process context to issue a LUN_RESET TMR + * to struct scsi_device + */ +static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg, + struct tcm_loop_nexus *tl_nexus, + int lun, int task, enum tcm_tmreq_table tmr) +{ + struct se_cmd *se_cmd = NULL; + struct se_session *se_sess; + struct se_portal_group *se_tpg; + struct tcm_loop_cmd *tl_cmd = NULL; + struct tcm_loop_tmr *tl_tmr = NULL; + int ret = TMR_FUNCTION_FAILED, rc; + + tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL); + if (!tl_cmd) { + pr_err("Unable to allocate memory for tl_cmd\n"); + return ret; + } + + tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL); + if (!tl_tmr) { + pr_err("Unable to allocate memory for tl_tmr\n"); + goto release; + } + init_waitqueue_head(&tl_tmr->tl_tmr_wait); + + se_cmd = &tl_cmd->tl_se_cmd; + se_tpg = &tl_tpg->tl_se_tpg; + se_sess = tl_nexus->se_sess; + /* + * Initialize struct se_cmd descriptor from target_core_mod infrastructure + */ + transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0, + DMA_NONE, MSG_SIMPLE_TAG, + &tl_cmd->tl_sense_buf[0]); + + rc = core_tmr_alloc_req(se_cmd, tl_tmr, tmr, GFP_KERNEL); + if (rc < 0) + goto release; + + if (tmr == TMR_ABORT_TASK) + se_cmd->se_tmr_req->ref_task_tag = task; + + /* + * Locate the underlying TCM struct se_lun + */ + if (transport_lookup_tmr_lun(se_cmd, lun) < 0) { + ret = TMR_LUN_DOES_NOT_EXIST; + goto release; + } + /* + * Queue the TMR to TCM Core and sleep waiting for + * tcm_loop_queue_tm_rsp() to wake us up. + */ + transport_generic_handle_tmr(se_cmd); + wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete)); + /* + * The TMR LUN_RESET has completed, check the response status and + * then release allocations. + */ + ret = se_cmd->se_tmr_req->response; +release: + if (se_cmd) + transport_generic_free_cmd(se_cmd, 1); + else + kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); + kfree(tl_tmr); + return ret; +} + +static int tcm_loop_abort_task(struct scsi_cmnd *sc) +{ + struct tcm_loop_hba *tl_hba; + struct tcm_loop_nexus *tl_nexus; + struct tcm_loop_tpg *tl_tpg; + int ret = FAILED; + + /* + * Locate the tcm_loop_hba_t pointer + */ + tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); + /* + * Locate the tl_nexus and se_sess pointers + */ + tl_nexus = tl_hba->tl_nexus; + if (!tl_nexus) { + pr_err("Unable to perform device reset without" + " active I_T Nexus\n"); + return FAILED; + } + + /* + * Locate the tl_tpg pointer from TargetID in sc->device->id + */ + tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; + ret = tcm_loop_issue_tmr(tl_tpg, tl_nexus, sc->device->lun, + sc->tag, TMR_ABORT_TASK); + return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED; +} + +/* + * Called from SCSI EH process context to issue a LUN_RESET TMR + * to struct scsi_device + */ +static int tcm_loop_device_reset(struct scsi_cmnd *sc) +{ + struct tcm_loop_hba *tl_hba; + struct tcm_loop_nexus *tl_nexus; + struct tcm_loop_tpg *tl_tpg; + int ret = FAILED; + + /* + * Locate the tcm_loop_hba_t pointer + */ + tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); + /* + * Locate the tl_nexus and se_sess pointers + */ + tl_nexus = tl_hba->tl_nexus; + if (!tl_nexus) { + pr_err("Unable to perform device reset without" + " active I_T Nexus\n"); + return FAILED; + } + /* + * Locate the tl_tpg pointer from TargetID in sc->device->id + */ + tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; + ret = tcm_loop_issue_tmr(tl_tpg, tl_nexus, sc->device->lun, + 0, TMR_LUN_RESET); + return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED; +} + +static int tcm_loop_target_reset(struct scsi_cmnd *sc) +{ + struct tcm_loop_hba *tl_hba; + struct tcm_loop_tpg *tl_tpg; + + /* + * Locate the tcm_loop_hba_t pointer + */ + tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); + if (!tl_hba) { + pr_err("Unable to perform device reset without" + " active I_T Nexus\n"); + return FAILED; + } + /* + * Locate the tl_tpg pointer from TargetID in sc->device->id + */ + tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; + if (tl_tpg) { + tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE; + return SUCCESS; + } + return FAILED; +} + +static int tcm_loop_slave_alloc(struct scsi_device *sd) +{ + set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags); + return 0; +} + +static int tcm_loop_slave_configure(struct scsi_device *sd) +{ + if (sd->tagged_supported) { + scsi_activate_tcq(sd, sd->queue_depth); + scsi_adjust_queue_depth(sd, MSG_SIMPLE_TAG, + sd->host->cmd_per_lun); + } else { + scsi_adjust_queue_depth(sd, 0, + sd->host->cmd_per_lun); + } + + return 0; +} + +static struct scsi_host_template tcm_loop_driver_template = { + .show_info = tcm_loop_show_info, + .proc_name = "tcm_loopback", + .name = "TCM_Loopback", + .queuecommand = tcm_loop_queuecommand, + .change_queue_depth = tcm_loop_change_queue_depth, + .change_queue_type = tcm_loop_change_queue_type, + .eh_abort_handler = tcm_loop_abort_task, + .eh_device_reset_handler = tcm_loop_device_reset, + .eh_target_reset_handler = tcm_loop_target_reset, + .can_queue = 1024, + .this_id = -1, + .sg_tablesize = 256, + .cmd_per_lun = 1024, + .max_sectors = 0xFFFF, + .use_clustering = DISABLE_CLUSTERING, + .slave_alloc = tcm_loop_slave_alloc, + .slave_configure = tcm_loop_slave_configure, + .module = THIS_MODULE, +}; + +static int tcm_loop_driver_probe(struct device *dev) +{ + struct tcm_loop_hba *tl_hba; + struct Scsi_Host *sh; + int error, host_prot; + + tl_hba = to_tcm_loop_hba(dev); + + sh = scsi_host_alloc(&tcm_loop_driver_template, + sizeof(struct tcm_loop_hba)); + if (!sh) { + pr_err("Unable to allocate struct scsi_host\n"); + return -ENODEV; + } + tl_hba->sh = sh; + + /* + * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata + */ + *((struct tcm_loop_hba **)sh->hostdata) = tl_hba; + /* + * Setup single ID, Channel and LUN for now.. + */ + sh->max_id = 2; + sh->max_lun = 0; + sh->max_channel = 0; + sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN; + + host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION | + SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION | + SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION; + + scsi_host_set_prot(sh, host_prot); + scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC); + + error = scsi_add_host(sh, &tl_hba->dev); + if (error) { + pr_err("%s: scsi_add_host failed\n", __func__); + scsi_host_put(sh); + return -ENODEV; + } + return 0; +} + +static int tcm_loop_driver_remove(struct device *dev) +{ + struct tcm_loop_hba *tl_hba; + struct Scsi_Host *sh; + + tl_hba = to_tcm_loop_hba(dev); + sh = tl_hba->sh; + + scsi_remove_host(sh); + scsi_host_put(sh); + return 0; +} + +static void tcm_loop_release_adapter(struct device *dev) +{ + struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev); + + kfree(tl_hba); +} + +/* + * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c + */ +static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id) +{ + int ret; + + tl_hba->dev.bus = &tcm_loop_lld_bus; + tl_hba->dev.parent = tcm_loop_primary; + tl_hba->dev.release = &tcm_loop_release_adapter; + dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id); + + ret = device_register(&tl_hba->dev); + if (ret) { + pr_err("device_register() failed for" + " tl_hba->dev: %d\n", ret); + return -ENODEV; + } + + return 0; +} + +/* + * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated + * tcm_loop SCSI bus. + */ +static int tcm_loop_alloc_core_bus(void) +{ + int ret; + + tcm_loop_primary = root_device_register("tcm_loop_0"); + if (IS_ERR(tcm_loop_primary)) { + pr_err("Unable to allocate tcm_loop_primary\n"); + return PTR_ERR(tcm_loop_primary); + } + + ret = bus_register(&tcm_loop_lld_bus); + if (ret) { + pr_err("bus_register() failed for tcm_loop_lld_bus\n"); + goto dev_unreg; + } + + ret = driver_register(&tcm_loop_driverfs); + if (ret) { + pr_err("driver_register() failed for" + "tcm_loop_driverfs\n"); + goto bus_unreg; + } + + pr_debug("Initialized TCM Loop Core Bus\n"); + return ret; + +bus_unreg: + bus_unregister(&tcm_loop_lld_bus); +dev_unreg: + root_device_unregister(tcm_loop_primary); + return ret; +} + +static void tcm_loop_release_core_bus(void) +{ + driver_unregister(&tcm_loop_driverfs); + bus_unregister(&tcm_loop_lld_bus); + root_device_unregister(tcm_loop_primary); + + pr_debug("Releasing TCM Loop Core BUS\n"); +} + +static char *tcm_loop_get_fabric_name(void) +{ + return "loopback"; +} + +static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg) +{ + struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; + struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; + /* + * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba() + * time based on the protocol dependent prefix of the passed configfs group. + * + * Based upon tl_proto_id, TCM_Loop emulates the requested fabric + * ProtocolID using target_core_fabric_lib.c symbols. + */ + switch (tl_hba->tl_proto_id) { + case SCSI_PROTOCOL_SAS: + return sas_get_fabric_proto_ident(se_tpg); + case SCSI_PROTOCOL_FCP: + return fc_get_fabric_proto_ident(se_tpg); + case SCSI_PROTOCOL_ISCSI: + return iscsi_get_fabric_proto_ident(se_tpg); + default: + pr_err("Unknown tl_proto_id: 0x%02x, using" + " SAS emulation\n", tl_hba->tl_proto_id); + break; + } + + return sas_get_fabric_proto_ident(se_tpg); +} + +static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg) +{ + struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; + /* + * Return the passed NAA identifier for the SAS Target Port + */ + return &tl_tpg->tl_hba->tl_wwn_address[0]; +} + +static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg) +{ + struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; + /* + * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83 + * to represent the SCSI Target Port. + */ + return tl_tpg->tl_tpgt; +} + +static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg) +{ + return 1; +} + +static u32 tcm_loop_get_pr_transport_id( + struct se_portal_group *se_tpg, + struct se_node_acl *se_nacl, + struct t10_pr_registration *pr_reg, + int *format_code, + unsigned char *buf) +{ + struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; + struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; + + switch (tl_hba->tl_proto_id) { + case SCSI_PROTOCOL_SAS: + return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, + format_code, buf); + case SCSI_PROTOCOL_FCP: + return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, + format_code, buf); + case SCSI_PROTOCOL_ISCSI: + return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, + format_code, buf); + default: + pr_err("Unknown tl_proto_id: 0x%02x, using" + " SAS emulation\n", tl_hba->tl_proto_id); + break; + } + + return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, + format_code, buf); +} + +static u32 tcm_loop_get_pr_transport_id_len( + struct se_portal_group *se_tpg, + struct se_node_acl *se_nacl, + struct t10_pr_registration *pr_reg, + int *format_code) +{ + struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; + struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; + + switch (tl_hba->tl_proto_id) { + case SCSI_PROTOCOL_SAS: + return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, + format_code); + case SCSI_PROTOCOL_FCP: + return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, + format_code); + case SCSI_PROTOCOL_ISCSI: + return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, + format_code); + default: + pr_err("Unknown tl_proto_id: 0x%02x, using" + " SAS emulation\n", tl_hba->tl_proto_id); + break; + } + + return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, + format_code); +} + +/* + * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above + * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations. + */ +static char *tcm_loop_parse_pr_out_transport_id( + struct se_portal_group *se_tpg, + const char *buf, + u32 *out_tid_len, + char **port_nexus_ptr) +{ + struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; + struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; + + switch (tl_hba->tl_proto_id) { + case SCSI_PROTOCOL_SAS: + return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, + port_nexus_ptr); + case SCSI_PROTOCOL_FCP: + return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, + port_nexus_ptr); + case SCSI_PROTOCOL_ISCSI: + return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, + port_nexus_ptr); + default: + pr_err("Unknown tl_proto_id: 0x%02x, using" + " SAS emulation\n", tl_hba->tl_proto_id); + break; + } + + return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, + port_nexus_ptr); +} + +/* + * Returning (1) here allows for target_core_mod struct se_node_acl to be generated + * based upon the incoming fabric dependent SCSI Initiator Port + */ +static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg) +{ + return 1; +} + +static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg) +{ + return 0; +} + +/* + * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for + * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest + */ +static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg) +{ + return 0; +} + +/* + * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will + * never be called for TCM_Loop by target_core_fabric_configfs.c code. + * It has been added here as a nop for target_fabric_tf_ops_check() + */ +static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg) +{ + return 0; +} + +static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl( + struct se_portal_group *se_tpg) +{ + struct tcm_loop_nacl *tl_nacl; + + tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL); + if (!tl_nacl) { + pr_err("Unable to allocate struct tcm_loop_nacl\n"); + return NULL; + } + + return &tl_nacl->se_node_acl; +} + +static void tcm_loop_tpg_release_fabric_acl( + struct se_portal_group *se_tpg, + struct se_node_acl *se_nacl) +{ + struct tcm_loop_nacl *tl_nacl = container_of(se_nacl, + struct tcm_loop_nacl, se_node_acl); + + kfree(tl_nacl); +} + +static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg) +{ + return 1; +} + +static u32 tcm_loop_sess_get_index(struct se_session *se_sess) +{ + return 1; +} + +static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl) +{ + return; +} + +static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd) +{ + struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, + struct tcm_loop_cmd, tl_se_cmd); + + return tl_cmd->sc_cmd_tag; +} + +static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd) +{ + struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, + struct tcm_loop_cmd, tl_se_cmd); + + return tl_cmd->sc_cmd_state; +} + +static int tcm_loop_shutdown_session(struct se_session *se_sess) +{ + return 0; +} + +static void tcm_loop_close_session(struct se_session *se_sess) +{ + return; +}; + +static int tcm_loop_write_pending(struct se_cmd *se_cmd) +{ + /* + * Since Linux/SCSI has already sent down a struct scsi_cmnd + * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array + * memory, and memory has already been mapped to struct se_cmd->t_mem_list + * format with transport_generic_map_mem_to_cmd(). + * + * We now tell TCM to add this WRITE CDB directly into the TCM storage + * object execution queue. + */ + target_execute_cmd(se_cmd); + return 0; +} + +static int tcm_loop_write_pending_status(struct se_cmd *se_cmd) +{ + return 0; +} + +static int tcm_loop_queue_data_in(struct se_cmd *se_cmd) +{ + struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, + struct tcm_loop_cmd, tl_se_cmd); + struct scsi_cmnd *sc = tl_cmd->sc; + + pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p" + " cdb: 0x%02x\n", sc, sc->cmnd[0]); + + sc->result = SAM_STAT_GOOD; + set_host_byte(sc, DID_OK); + if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || + (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) + scsi_set_resid(sc, se_cmd->residual_count); + sc->scsi_done(sc); + return 0; +} + +static int tcm_loop_queue_status(struct se_cmd *se_cmd) +{ + struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, + struct tcm_loop_cmd, tl_se_cmd); + struct scsi_cmnd *sc = tl_cmd->sc; + + pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p" + " cdb: 0x%02x\n", sc, sc->cmnd[0]); + + if (se_cmd->sense_buffer && + ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || + (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { + + memcpy(sc->sense_buffer, se_cmd->sense_buffer, + SCSI_SENSE_BUFFERSIZE); + sc->result = SAM_STAT_CHECK_CONDITION; + set_driver_byte(sc, DRIVER_SENSE); + } else + sc->result = se_cmd->scsi_status; + + set_host_byte(sc, DID_OK); + if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || + (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) + scsi_set_resid(sc, se_cmd->residual_count); + sc->scsi_done(sc); + return 0; +} + +static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd) +{ + struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; + struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr; + /* + * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead + * and wake up the wait_queue_head_t in tcm_loop_device_reset() + */ + atomic_set(&tl_tmr->tmr_complete, 1); + wake_up(&tl_tmr->tl_tmr_wait); +} + +static void tcm_loop_aborted_task(struct se_cmd *se_cmd) +{ + return; +} + +static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba) +{ + switch (tl_hba->tl_proto_id) { + case SCSI_PROTOCOL_SAS: + return "SAS"; + case SCSI_PROTOCOL_FCP: + return "FCP"; + case SCSI_PROTOCOL_ISCSI: + return "iSCSI"; + default: + break; + } + + return "Unknown"; +} + +/* Start items for tcm_loop_port_cit */ + +static int tcm_loop_port_link( + struct se_portal_group *se_tpg, + struct se_lun *lun) +{ + struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, + struct tcm_loop_tpg, tl_se_tpg); + struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; + + atomic_inc(&tl_tpg->tl_tpg_port_count); + smp_mb__after_atomic(); + /* + * Add Linux/SCSI struct scsi_device by HCTL + */ + scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun); + + pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n"); + return 0; +} + +static void tcm_loop_port_unlink( + struct se_portal_group *se_tpg, + struct se_lun *se_lun) +{ + struct scsi_device *sd; + struct tcm_loop_hba *tl_hba; + struct tcm_loop_tpg *tl_tpg; + + tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); + tl_hba = tl_tpg->tl_hba; + + sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt, + se_lun->unpacked_lun); + if (!sd) { + pr_err("Unable to locate struct scsi_device for %d:%d:" + "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun); + return; + } + /* + * Remove Linux/SCSI struct scsi_device by HCTL + */ + scsi_remove_device(sd); + scsi_device_put(sd); + + atomic_dec(&tl_tpg->tl_tpg_port_count); + smp_mb__after_atomic(); + + pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n"); +} + +/* End items for tcm_loop_port_cit */ + +/* Start items for tcm_loop_nexus_cit */ + +static int tcm_loop_make_nexus( + struct tcm_loop_tpg *tl_tpg, + const char *name) +{ + struct se_portal_group *se_tpg; + struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; + struct tcm_loop_nexus *tl_nexus; + int ret = -ENOMEM; + + if (tl_tpg->tl_hba->tl_nexus) { + pr_debug("tl_tpg->tl_hba->tl_nexus already exists\n"); + return -EEXIST; + } + se_tpg = &tl_tpg->tl_se_tpg; + + tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL); + if (!tl_nexus) { + pr_err("Unable to allocate struct tcm_loop_nexus\n"); + return -ENOMEM; + } + /* + * Initialize the struct se_session pointer + */ + tl_nexus->se_sess = transport_init_session(TARGET_PROT_ALL); + if (IS_ERR(tl_nexus->se_sess)) { + ret = PTR_ERR(tl_nexus->se_sess); + goto out; + } + /* + * Since we are running in 'demo mode' this call with generate a + * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI + * Initiator port name of the passed configfs group 'name'. + */ + tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( + se_tpg, (unsigned char *)name); + if (!tl_nexus->se_sess->se_node_acl) { + transport_free_session(tl_nexus->se_sess); + goto out; + } + /* + * Now, register the SAS I_T Nexus as active with the call to + * transport_register_session() + */ + __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl, + tl_nexus->se_sess, tl_nexus); + tl_tpg->tl_hba->tl_nexus = tl_nexus; + pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated" + " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), + name); + return 0; + +out: + kfree(tl_nexus); + return ret; +} + +static int tcm_loop_drop_nexus( + struct tcm_loop_tpg *tpg) +{ + struct se_session *se_sess; + struct tcm_loop_nexus *tl_nexus; + struct tcm_loop_hba *tl_hba = tpg->tl_hba; + + if (!tl_hba) + return -ENODEV; + + tl_nexus = tl_hba->tl_nexus; + if (!tl_nexus) + return -ENODEV; + + se_sess = tl_nexus->se_sess; + if (!se_sess) + return -ENODEV; + + if (atomic_read(&tpg->tl_tpg_port_count)) { + pr_err("Unable to remove TCM_Loop I_T Nexus with" + " active TPG port count: %d\n", + atomic_read(&tpg->tl_tpg_port_count)); + return -EPERM; + } + + pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated" + " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), + tl_nexus->se_sess->se_node_acl->initiatorname); + /* + * Release the SCSI I_T Nexus to the emulated SAS Target Port + */ + transport_deregister_session(tl_nexus->se_sess); + tpg->tl_hba->tl_nexus = NULL; + kfree(tl_nexus); + return 0; +} + +/* End items for tcm_loop_nexus_cit */ + +static ssize_t tcm_loop_tpg_show_nexus( + struct se_portal_group *se_tpg, + char *page) +{ + struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, + struct tcm_loop_tpg, tl_se_tpg); + struct tcm_loop_nexus *tl_nexus; + ssize_t ret; + + tl_nexus = tl_tpg->tl_hba->tl_nexus; + if (!tl_nexus) + return -ENODEV; + + ret = snprintf(page, PAGE_SIZE, "%s\n", + tl_nexus->se_sess->se_node_acl->initiatorname); + + return ret; +} + +static ssize_t tcm_loop_tpg_store_nexus( + struct se_portal_group *se_tpg, + const char *page, + size_t count) +{ + struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, + struct tcm_loop_tpg, tl_se_tpg); + struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; + unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr; + int ret; + /* + * Shutdown the active I_T nexus if 'NULL' is passed.. + */ + if (!strncmp(page, "NULL", 4)) { + ret = tcm_loop_drop_nexus(tl_tpg); + return (!ret) ? count : ret; + } + /* + * Otherwise make sure the passed virtual Initiator port WWN matches + * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call + * tcm_loop_make_nexus() + */ + if (strlen(page) >= TL_WWN_ADDR_LEN) { + pr_err("Emulated NAA Sas Address: %s, exceeds" + " max: %d\n", page, TL_WWN_ADDR_LEN); + return -EINVAL; + } + snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page); + + ptr = strstr(i_port, "naa."); + if (ptr) { + if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) { + pr_err("Passed SAS Initiator Port %s does not" + " match target port protoid: %s\n", i_port, + tcm_loop_dump_proto_id(tl_hba)); + return -EINVAL; + } + port_ptr = &i_port[0]; + goto check_newline; + } + ptr = strstr(i_port, "fc."); + if (ptr) { + if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) { + pr_err("Passed FCP Initiator Port %s does not" + " match target port protoid: %s\n", i_port, + tcm_loop_dump_proto_id(tl_hba)); + return -EINVAL; + } + port_ptr = &i_port[3]; /* Skip over "fc." */ + goto check_newline; + } + ptr = strstr(i_port, "iqn."); + if (ptr) { + if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) { + pr_err("Passed iSCSI Initiator Port %s does not" + " match target port protoid: %s\n", i_port, + tcm_loop_dump_proto_id(tl_hba)); + return -EINVAL; + } + port_ptr = &i_port[0]; + goto check_newline; + } + pr_err("Unable to locate prefix for emulated Initiator Port:" + " %s\n", i_port); + return -EINVAL; + /* + * Clear any trailing newline for the NAA WWN + */ +check_newline: + if (i_port[strlen(i_port)-1] == '\n') + i_port[strlen(i_port)-1] = '\0'; + + ret = tcm_loop_make_nexus(tl_tpg, port_ptr); + if (ret < 0) + return ret; + + return count; +} + +TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR); + +static ssize_t tcm_loop_tpg_show_transport_status( + struct se_portal_group *se_tpg, + char *page) +{ + struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, + struct tcm_loop_tpg, tl_se_tpg); + const char *status = NULL; + ssize_t ret = -EINVAL; + + switch (tl_tpg->tl_transport_status) { + case TCM_TRANSPORT_ONLINE: + status = "online"; + break; + case TCM_TRANSPORT_OFFLINE: + status = "offline"; + break; + default: + break; + } + + if (status) + ret = snprintf(page, PAGE_SIZE, "%s\n", status); + + return ret; +} + +static ssize_t tcm_loop_tpg_store_transport_status( + struct se_portal_group *se_tpg, + const char *page, + size_t count) +{ + struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, + struct tcm_loop_tpg, tl_se_tpg); + + if (!strncmp(page, "online", 6)) { + tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE; + return count; + } + if (!strncmp(page, "offline", 7)) { + tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE; + return count; + } + return -EINVAL; +} + +TF_TPG_BASE_ATTR(tcm_loop, transport_status, S_IRUGO | S_IWUSR); + +static struct configfs_attribute *tcm_loop_tpg_attrs[] = { + &tcm_loop_tpg_nexus.attr, + &tcm_loop_tpg_transport_status.attr, + NULL, +}; + +/* Start items for tcm_loop_naa_cit */ + +static struct se_portal_group *tcm_loop_make_naa_tpg( + struct se_wwn *wwn, + struct config_group *group, + const char *name) +{ + struct tcm_loop_hba *tl_hba = container_of(wwn, + struct tcm_loop_hba, tl_hba_wwn); + struct tcm_loop_tpg *tl_tpg; + char *tpgt_str, *end_ptr; + int ret; + unsigned short int tpgt; + + tpgt_str = strstr(name, "tpgt_"); + if (!tpgt_str) { + pr_err("Unable to locate \"tpgt_#\" directory" + " group\n"); + return ERR_PTR(-EINVAL); + } + tpgt_str += 5; /* Skip ahead of "tpgt_" */ + tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0); + + if (tpgt >= TL_TPGS_PER_HBA) { + pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:" + " %u\n", tpgt, TL_TPGS_PER_HBA); + return ERR_PTR(-EINVAL); + } + tl_tpg = &tl_hba->tl_hba_tpgs[tpgt]; + tl_tpg->tl_hba = tl_hba; + tl_tpg->tl_tpgt = tpgt; + /* + * Register the tl_tpg as a emulated SAS TCM Target Endpoint + */ + ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops, + wwn, &tl_tpg->tl_se_tpg, tl_tpg, + TRANSPORT_TPG_TYPE_NORMAL); + if (ret < 0) + return ERR_PTR(-ENOMEM); + + pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s" + " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), + config_item_name(&wwn->wwn_group.cg_item), tpgt); + + return &tl_tpg->tl_se_tpg; +} + +static void tcm_loop_drop_naa_tpg( + struct se_portal_group *se_tpg) +{ + struct se_wwn *wwn = se_tpg->se_tpg_wwn; + struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, + struct tcm_loop_tpg, tl_se_tpg); + struct tcm_loop_hba *tl_hba; + unsigned short tpgt; + + tl_hba = tl_tpg->tl_hba; + tpgt = tl_tpg->tl_tpgt; + /* + * Release the I_T Nexus for the Virtual SAS link if present + */ + tcm_loop_drop_nexus(tl_tpg); + /* + * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint + */ + core_tpg_deregister(se_tpg); + + tl_tpg->tl_hba = NULL; + tl_tpg->tl_tpgt = 0; + + pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s" + " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), + config_item_name(&wwn->wwn_group.cg_item), tpgt); +} + +/* End items for tcm_loop_naa_cit */ + +/* Start items for tcm_loop_cit */ + +static struct se_wwn *tcm_loop_make_scsi_hba( + struct target_fabric_configfs *tf, + struct config_group *group, + const char *name) +{ + struct tcm_loop_hba *tl_hba; + struct Scsi_Host *sh; + char *ptr; + int ret, off = 0; + + tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL); + if (!tl_hba) { + pr_err("Unable to allocate struct tcm_loop_hba\n"); + return ERR_PTR(-ENOMEM); + } + /* + * Determine the emulated Protocol Identifier and Target Port Name + * based on the incoming configfs directory name. + */ + ptr = strstr(name, "naa."); + if (ptr) { + tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS; + goto check_len; + } + ptr = strstr(name, "fc."); + if (ptr) { + tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP; + off = 3; /* Skip over "fc." */ + goto check_len; + } + ptr = strstr(name, "iqn."); + if (!ptr) { + pr_err("Unable to locate prefix for emulated Target " + "Port: %s\n", name); + ret = -EINVAL; + goto out; + } + tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI; + +check_len: + if (strlen(name) >= TL_WWN_ADDR_LEN) { + pr_err("Emulated NAA %s Address: %s, exceeds" + " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba), + TL_WWN_ADDR_LEN); + ret = -EINVAL; + goto out; + } + snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]); + + /* + * Call device_register(tl_hba->dev) to register the emulated + * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after + * device_register() callbacks in tcm_loop_driver_probe() + */ + ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt); + if (ret) + goto out; + + sh = tl_hba->sh; + tcm_loop_hba_no_cnt++; + pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target" + " %s Address: %s at Linux/SCSI Host ID: %d\n", + tcm_loop_dump_proto_id(tl_hba), name, sh->host_no); + + return &tl_hba->tl_hba_wwn; +out: + kfree(tl_hba); + return ERR_PTR(ret); +} + +static void tcm_loop_drop_scsi_hba( + struct se_wwn *wwn) +{ + struct tcm_loop_hba *tl_hba = container_of(wwn, + struct tcm_loop_hba, tl_hba_wwn); + + pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target" + " SAS Address: %s at Linux/SCSI Host ID: %d\n", + tl_hba->tl_wwn_address, tl_hba->sh->host_no); + /* + * Call device_unregister() on the original tl_hba->dev. + * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will + * release *tl_hba; + */ + device_unregister(&tl_hba->dev); +} + +/* Start items for tcm_loop_cit */ +static ssize_t tcm_loop_wwn_show_attr_version( + struct target_fabric_configfs *tf, + char *page) +{ + return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION); +} + +TF_WWN_ATTR_RO(tcm_loop, version); + +static struct configfs_attribute *tcm_loop_wwn_attrs[] = { + &tcm_loop_wwn_version.attr, + NULL, +}; + +/* End items for tcm_loop_cit */ + +static int tcm_loop_register_configfs(void) +{ + struct target_fabric_configfs *fabric; + int ret; + /* + * Set the TCM Loop HBA counter to zero + */ + tcm_loop_hba_no_cnt = 0; + /* + * Register the top level struct config_item_type with TCM core + */ + fabric = target_fabric_configfs_init(THIS_MODULE, "loopback"); + if (IS_ERR(fabric)) { + pr_err("tcm_loop_register_configfs() failed!\n"); + return PTR_ERR(fabric); + } + /* + * Setup the fabric API of function pointers used by target_core_mod + */ + fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name; + fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident; + fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn; + fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag; + fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth; + fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id; + fabric->tf_ops.tpg_get_pr_transport_id_len = + &tcm_loop_get_pr_transport_id_len; + fabric->tf_ops.tpg_parse_pr_out_transport_id = + &tcm_loop_parse_pr_out_transport_id; + fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode; + fabric->tf_ops.tpg_check_demo_mode_cache = + &tcm_loop_check_demo_mode_cache; + fabric->tf_ops.tpg_check_demo_mode_write_protect = + &tcm_loop_check_demo_mode_write_protect; + fabric->tf_ops.tpg_check_prod_mode_write_protect = + &tcm_loop_check_prod_mode_write_protect; + /* + * The TCM loopback fabric module runs in demo-mode to a local + * virtual SCSI device, so fabric dependent initator ACLs are + * not required. + */ + fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl; + fabric->tf_ops.tpg_release_fabric_acl = + &tcm_loop_tpg_release_fabric_acl; + fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index; + /* + * Used for setting up remaining TCM resources in process context + */ + fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free; + fabric->tf_ops.release_cmd = &tcm_loop_release_cmd; + fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session; + fabric->tf_ops.close_session = &tcm_loop_close_session; + fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index; + fabric->tf_ops.sess_get_initiator_sid = NULL; + fabric->tf_ops.write_pending = &tcm_loop_write_pending; + fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status; + /* + * Not used for TCM loopback + */ + fabric->tf_ops.set_default_node_attributes = + &tcm_loop_set_default_node_attributes; + fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag; + fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state; + fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in; + fabric->tf_ops.queue_status = &tcm_loop_queue_status; + fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp; + fabric->tf_ops.aborted_task = &tcm_loop_aborted_task; + + /* + * Setup function pointers for generic logic in target_core_fabric_configfs.c + */ + fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba; + fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba; + fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg; + fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg; + /* + * fabric_post_link() and fabric_pre_unlink() are used for + * registration and release of TCM Loop Virtual SCSI LUNs. + */ + fabric->tf_ops.fabric_post_link = &tcm_loop_port_link; + fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink; + fabric->tf_ops.fabric_make_np = NULL; + fabric->tf_ops.fabric_drop_np = NULL; + /* + * Setup default attribute lists for various fabric->tf_cit_tmpl + */ + fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs; + fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs; + fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL; + fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL; + fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL; + /* + * Once fabric->tf_ops has been setup, now register the fabric for + * use within TCM + */ + ret = target_fabric_configfs_register(fabric); + if (ret < 0) { + pr_err("target_fabric_configfs_register() for" + " TCM_Loop failed!\n"); + target_fabric_configfs_free(fabric); + return -1; + } + /* + * Setup our local pointer to *fabric. + */ + tcm_loop_fabric_configfs = fabric; + pr_debug("TCM_LOOP[0] - Set fabric ->" + " tcm_loop_fabric_configfs\n"); + return 0; +} + +static void tcm_loop_deregister_configfs(void) +{ + if (!tcm_loop_fabric_configfs) + return; + + target_fabric_configfs_deregister(tcm_loop_fabric_configfs); + tcm_loop_fabric_configfs = NULL; + pr_debug("TCM_LOOP[0] - Cleared" + " tcm_loop_fabric_configfs\n"); +} + +static int __init tcm_loop_fabric_init(void) +{ + int ret = -ENOMEM; + + tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0); + if (!tcm_loop_workqueue) + goto out; + + tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache", + sizeof(struct tcm_loop_cmd), + __alignof__(struct tcm_loop_cmd), + 0, NULL); + if (!tcm_loop_cmd_cache) { + pr_debug("kmem_cache_create() for" + " tcm_loop_cmd_cache failed\n"); + goto out_destroy_workqueue; + } + + ret = tcm_loop_alloc_core_bus(); + if (ret) + goto out_destroy_cache; + + ret = tcm_loop_register_configfs(); + if (ret) + goto out_release_core_bus; + + return 0; + +out_release_core_bus: + tcm_loop_release_core_bus(); +out_destroy_cache: + kmem_cache_destroy(tcm_loop_cmd_cache); +out_destroy_workqueue: + destroy_workqueue(tcm_loop_workqueue); +out: + return ret; +} + +static void __exit tcm_loop_fabric_exit(void) +{ + tcm_loop_deregister_configfs(); + tcm_loop_release_core_bus(); + kmem_cache_destroy(tcm_loop_cmd_cache); + destroy_workqueue(tcm_loop_workqueue); +} + +MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module"); +MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>"); +MODULE_LICENSE("GPL"); +module_init(tcm_loop_fabric_init); +module_exit(tcm_loop_fabric_exit); |