/* * iSER transport for the Open iSCSI Initiator & iSER transport internals * * Copyright (C) 2004 Dmitry Yusupov * Copyright (C) 2004 Alex Aizman * Copyright (C) 2005 Mike Christie * based on code maintained by open-iscsi@googlegroups.com * * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #ifndef __ISCSI_ISER_H__ #define __ISCSI_ISER_H__ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define DRV_NAME "iser" #define PFX DRV_NAME ": " #define DRV_VER "0.1" #define DRV_DATE "May 7th, 2006" #define iser_dbg(fmt, arg...) \ do { \ if (iser_debug_level > 1) \ printk(KERN_DEBUG PFX "%s:" fmt,\ __func__ , ## arg); \ } while (0) #define iser_warn(fmt, arg...) \ do { \ if (iser_debug_level > 0) \ printk(KERN_DEBUG PFX "%s:" fmt,\ __func__ , ## arg); \ } while (0) #define iser_err(fmt, arg...) \ do { \ printk(KERN_ERR PFX "%s:" fmt, \ __func__ , ## arg); \ } while (0) #define SHIFT_4K 12 #define SIZE_4K (1ULL << SHIFT_4K) #define MASK_4K (~(SIZE_4K-1)) /* support up to 512KB in one RDMA */ #define ISCSI_ISER_SG_TABLESIZE (0x80000 >> SHIFT_4K) #define ISER_DEF_CMD_PER_LUN 128 /* QP settings */ /* Maximal bounds on received asynchronous PDUs */ #define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */ #define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), * * SCSI_TMFUNC(2), LOGOUT(1) */ #define ISER_QP_MAX_RECV_DTOS (ISCSI_DEF_XMIT_CMDS_MAX) #define ISER_MIN_POSTED_RX (ISCSI_DEF_XMIT_CMDS_MAX >> 2) /* the max TX (send) WR supported by the iSER QP is defined by * * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect * * to have at max for SCSI command. The tx posting & completion handling code * * supports -EAGAIN scheme where tx is suspended till the QP has room for more * * send WR. D=8 comes from 64K/8K */ #define ISER_INFLIGHT_DATAOUTS 8 #define ISER_QP_MAX_REQ_DTOS (ISCSI_DEF_XMIT_CMDS_MAX * \ (1 + ISER_INFLIGHT_DATAOUTS) + \ ISER_MAX_TX_MISC_PDUS + \ ISER_MAX_RX_MISC_PDUS) #define ISER_VER 0x10 #define ISER_WSV 0x08 #define ISER_RSV 0x04 struct iser_hdr { u8 flags; u8 rsvd[3]; __be32 write_stag; /* write rkey */ __be64 write_va; __be32 read_stag; /* read rkey */ __be64 read_va; } __attribute__((packed)); /* Constant PDU lengths calculations */ #define ISER_HEADERS_LEN (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr)) #define ISER_RECV_DATA_SEG_LEN 128 #define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN) #define ISER_RX_LOGIN_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN) /* Length of an object name string */ #define ISER_OBJECT_NAME_SIZE 64 enum iser_ib_conn_state { ISER_CONN_INIT, /* descriptor allocd, no conn */ ISER_CONN_PENDING, /* in the process of being established */ ISER_CONN_UP, /* up and running */ ISER_CONN_TERMINATING, /* in the process of being terminated */ ISER_CONN_DOWN, /* shut down */ ISER_CONN_STATES_NUM }; enum iser_task_status { ISER_TASK_STATUS_INIT = 0, ISER_TASK_STATUS_STARTED, ISER_TASK_STATUS_COMPLETED }; enum iser_data_dir { ISER_DIR_IN = 0, /* to initiator */ ISER_DIR_OUT, /* from initiator */ ISER_DIRS_NUM }; struct iser_data_buf { void *buf; /* pointer to the sg list */ unsigned int size; /* num entries of this sg */ unsigned long data_len; /* total data len */ unsigned int dma_nents; /* returned by dma_map_sg */ char *copy_buf; /* allocated copy buf for SGs unaligned * * for rdma which are copied */ struct scatterlist sg_single; /* SG-ified clone of a non SG SC or * * unaligned SG */ }; /* fwd declarations */ struct iser_device; struct iscsi_iser_conn; struct iscsi_iser_task; struct iscsi_endpoint; struct iser_mem_reg { u32 lkey; u32 rkey; u64 va; u64 len; void *mem_h; int is_fmr; }; struct iser_regd_buf { struct iser_mem_reg reg; /* memory registration info */ void *virt_addr; struct iser_device *device; /* device->device for dma_unmap */ enum dma_data_direction direction; /* direction for dma_unmap */ unsigned int data_size; }; enum iser_desc_type { ISCSI_TX_CONTROL , ISCSI_TX_SCSI_COMMAND, ISCSI_TX_DATAOUT }; struct iser_tx_desc { struct iser_hdr iser_header; struct iscsi_hdr iscsi_header; enum iser_desc_type type; u64 dma_addr; /* sg[0] points to iser/iscsi headers, sg[1] optionally points to either of immediate data, unsolicited data-out or control (login,text) */ struct ib_sge tx_sg[2]; int num_sge; }; #define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \ sizeof(u64) + sizeof(struct ib_sge))) struct iser_rx_desc { struct iser_hdr iser_header; struct iscsi_hdr iscsi_header; char data[ISER_RECV_DATA_SEG_LEN]; u64 dma_addr; struct ib_sge rx_sg; char pad[ISER_RX_PAD_SIZE]; } __attribute__((packed)); struct iser_device { struct ib_device *ib_device; struct ib_pd *pd; struct ib_cq *rx_cq; struct ib_cq *tx_cq; struct ib_mr *mr; struct tasklet_struct cq_tasklet; struct ib_event_handler event_handler; struct list_head ig_list; /* entry in ig devices list */ int refcount; }; struct iser_conn { struct iscsi_iser_conn *iser_conn; /* iser conn for upcalls */ struct iscsi_endpoint *ep; enum iser_ib_conn_state state; /* rdma connection state */ atomic_t refcount; spinlock_t lock; /* used for state changes */ struct iser_device *device; /* device context */ struct rdma_cm_id *cma_id; /* CMA ID */ struct ib_qp *qp; /* QP */ struct ib_fmr_pool *fmr_pool; /* pool of IB FMRs */ wait_queue_head_t wait; /* waitq for conn/disconn */ int post_recv_buf_count; /* posted rx count */ atomic_t post_send_buf_count; /* posted tx count */ char name[ISER_OBJECT_NAME_SIZE]; struct iser_page_vec *page_vec; /* represents SG to fmr maps* * maps serialized as tx is*/ struct list_head conn_list; /* entry in ig conn list */ char *login_buf; u64 login_dma; unsigned int rx_desc_head; struct iser_rx_desc *rx_descs; struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX]; }; struct iscsi_iser_conn { struct iscsi_conn *iscsi_conn;/* ptr to iscsi conn */ struct iser_conn *ib_conn; /* iSER IB conn */ }; struct iscsi_iser_task { struct iser_tx_desc desc; struct iscsi_iser_conn *iser_conn; enum iser_task_status status; int command_sent; /* set if command sent */ int dir[ISER_DIRS_NUM]; /* set if dir use*/ struct iser_regd_buf rdma_regd[ISER_DIRS_NUM];/* regd rdma buf */ struct iser_data_buf data[ISER_DIRS_NUM]; /* orig. data des*/ struct iser_data_buf data_copy[ISER_DIRS_NUM];/* contig. copy */ int headers_initialized; }; struct iser_page_vec { u64 *pages; int length; int offset; int data_size; }; struct iser_global { struct mutex device_list_mutex;/* */ struct list_head device_list; /* all iSER devices */ struct mutex connlist_mutex; struct list_head connlist; /* all iSER IB connections */ struct kmem_cache *desc_cache; }; extern struct iser_global ig; extern int iser_debug_level; /* allocate connection resources needed for rdma functionality */ int iser_conn_set_full_featured_mode(struct iscsi_conn *conn); int iser_send_control(struct iscsi_conn *conn, struct iscsi_task *task); int iser_send_command(struct iscsi_conn *conn, struct iscsi_task *task); int iser_send_data_out(struct iscsi_conn *conn, struct iscsi_task *task, struct iscsi_data *hdr); void iscsi_iser_recv(struct iscsi_conn *conn, struct iscsi_hdr *hdr, char *rx_data, int rx_data_len); void iser_conn_init(struct iser_conn *ib_conn); void iser_conn_get(struct iser_conn *ib_conn); int iser_conn_put(struct iser_conn *ib_conn, int destroy_cma_id_allowed); void iser_conn_terminate(struct iser_conn *ib_conn); void iser_rcv_completion(struct iser_rx_desc *desc, unsigned long dto_xfer_len, struct iser_conn *ib_conn); void iser_snd_completion(struct iser_tx_desc *desc, struct iser_conn *ib_conn); void iser_task_rdma_init(struct iscsi_iser_task *task); void iser_task_rdma_finalize(struct iscsi_iser_task *task); void iser_free_rx_descriptors(struct iser_conn *ib_conn); void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *task, enum iser_data_dir cmd_dir); int iser_reg_rdma_mem(struct iscsi_iser_task *task, enum iser_data_dir cmd_dir); int iser_connect(struct iser_conn *ib_conn, struct sockaddr_in *src_addr, struct sockaddr_in *dst_addr, int non_blocking); int iser_reg_page_vec(struct iser_conn *ib_conn, struct iser_page_vec *page_vec, struct iser_mem_reg *mem_reg); void iser_unreg_mem(struct iser_mem_reg *mem_reg); int iser_post_recvl(struct iser_conn *ib_conn); int iser_post_recvm(struct iser_conn *ib_conn, int count); int iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc); int iser_dma_map_task_data(struct iscsi_iser_task *iser_task, struct iser_data_buf *data, enum iser_data_dir iser_dir, enum dma_data_direction dma_dir); void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task); int iser_initialize_task_headers(struct iscsi_task *task, struct iser_tx_desc *tx_desc); #endif