2 * iSER transport for the Open iSCSI Initiator & iSER transport internals
4 * Copyright (C) 2004 Dmitry Yusupov
5 * Copyright (C) 2004 Alex Aizman
6 * Copyright (C) 2005 Mike Christie
7 * based on code maintained by open-iscsi@googlegroups.com
9 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
10 * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
11 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
13 * This software is available to you under a choice of one of two
14 * licenses. You may choose to be licensed under the terms of the GNU
15 * General Public License (GPL) Version 2, available from the file
16 * COPYING in the main directory of this source tree, or the
17 * OpenIB.org BSD license below:
19 * Redistribution and use in source and binary forms, with or
20 * without modification, are permitted provided that the following
23 * - Redistributions of source code must retain the above
24 * copyright notice, this list of conditions and the following
27 * - Redistributions in binary form must reproduce the above
28 * copyright notice, this list of conditions and the following
29 * disclaimer in the documentation and/or other materials
30 * provided with the distribution.
32 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
33 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
34 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
35 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
36 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
37 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
38 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
41 #ifndef __ISCSI_ISER_H__
42 #define __ISCSI_ISER_H__
44 #include <linux/types.h>
45 #include <linux/net.h>
46 #include <linux/printk.h>
47 #include <scsi/libiscsi.h>
48 #include <scsi/scsi_transport_iscsi.h>
49 #include <scsi/scsi_cmnd.h>
50 #include <scsi/scsi_device.h>
52 #include <linux/interrupt.h>
53 #include <linux/wait.h>
54 #include <linux/sched.h>
55 #include <linux/list.h>
56 #include <linux/slab.h>
57 #include <linux/dma-mapping.h>
58 #include <linux/mutex.h>
59 #include <linux/mempool.h>
60 #include <linux/uio.h>
62 #include <linux/socket.h>
64 #include <linux/in6.h>
66 #include <rdma/ib_verbs.h>
67 #include <rdma/ib_fmr_pool.h>
68 #include <rdma/rdma_cm.h>
70 #define DRV_NAME "iser"
71 #define PFX DRV_NAME ": "
74 #define iser_dbg(fmt, arg...) \
76 if (unlikely(iser_debug_level > 2)) \
77 printk(KERN_DEBUG PFX "%s: " fmt,\
81 #define iser_warn(fmt, arg...) \
83 if (unlikely(iser_debug_level > 0)) \
84 pr_warn(PFX "%s: " fmt, \
88 #define iser_info(fmt, arg...) \
90 if (unlikely(iser_debug_level > 1)) \
91 pr_info(PFX "%s: " fmt, \
95 #define iser_err(fmt, arg...) \
96 pr_err(PFX "%s: " fmt, __func__ , ## arg)
99 #define SIZE_4K (1ULL << SHIFT_4K)
100 #define MASK_4K (~(SIZE_4K-1))
102 /* Default support is 512KB I/O size */
103 #define ISER_DEF_MAX_SECTORS 1024
104 #define ISCSI_ISER_DEF_SG_TABLESIZE ((ISER_DEF_MAX_SECTORS * 512) >> SHIFT_4K)
105 /* Maximum support is 8MB I/O size */
106 #define ISCSI_ISER_MAX_SG_TABLESIZE ((16384 * 512) >> SHIFT_4K)
108 #define ISER_DEF_XMIT_CMDS_DEFAULT 512
109 #if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT
110 #define ISER_DEF_XMIT_CMDS_MAX ISCSI_DEF_XMIT_CMDS_MAX
112 #define ISER_DEF_XMIT_CMDS_MAX ISER_DEF_XMIT_CMDS_DEFAULT
114 #define ISER_DEF_CMD_PER_LUN ISER_DEF_XMIT_CMDS_MAX
117 /* Maximal bounds on received asynchronous PDUs */
118 #define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */
120 #define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), *
121 * SCSI_TMFUNC(2), LOGOUT(1) */
123 #define ISER_QP_MAX_RECV_DTOS (ISER_DEF_XMIT_CMDS_MAX)
125 #define ISER_MIN_POSTED_RX (ISER_DEF_XMIT_CMDS_MAX >> 2)
127 /* the max TX (send) WR supported by the iSER QP is defined by *
128 * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect *
129 * to have at max for SCSI command. The tx posting & completion handling code *
130 * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
131 * send WR. D=8 comes from 64K/8K */
133 #define ISER_INFLIGHT_DATAOUTS 8
135 #define ISER_QP_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \
136 (1 + ISER_INFLIGHT_DATAOUTS) + \
137 ISER_MAX_TX_MISC_PDUS + \
138 ISER_MAX_RX_MISC_PDUS)
140 /* Max registration work requests per command */
141 #define ISER_MAX_REG_WR_PER_CMD 5
143 /* For Signature we don't support DATAOUTs so no need to make room for them */
144 #define ISER_QP_SIG_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \
145 (1 + ISER_MAX_REG_WR_PER_CMD) + \
146 ISER_MAX_TX_MISC_PDUS + \
147 ISER_MAX_RX_MISC_PDUS)
149 #define ISER_GET_MAX_XMIT_CMDS(send_wr) ((send_wr \
150 - ISER_MAX_TX_MISC_PDUS \
151 - ISER_MAX_RX_MISC_PDUS) / \
152 (1 + ISER_INFLIGHT_DATAOUTS))
154 #define ISER_SIGNAL_CMD_COUNT 32
156 #define ISER_VER 0x10
157 #define ISER_WSV 0x08
158 #define ISER_RSV 0x04
161 * struct iser_hdr - iSER header
163 * @flags: flags support (zbva, remote_inv)
165 * @write_stag: write rkey
166 * @write_va: write virtual address
167 * @reaf_stag: read rkey
168 * @read_va: read virtual address
177 } __attribute__((packed
));
180 #define ISER_ZBVA_NOT_SUPPORTED 0x80
181 #define ISER_SEND_W_INV_NOT_SUPPORTED 0x40
188 /* Constant PDU lengths calculations */
189 #define ISER_HEADERS_LEN (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr))
191 #define ISER_RECV_DATA_SEG_LEN 128
192 #define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
193 #define ISER_RX_LOGIN_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
195 /* Length of an object name string */
196 #define ISER_OBJECT_NAME_SIZE 64
198 enum iser_conn_state
{
199 ISER_CONN_INIT
, /* descriptor allocd, no conn */
200 ISER_CONN_PENDING
, /* in the process of being established */
201 ISER_CONN_UP
, /* up and running */
202 ISER_CONN_TERMINATING
, /* in the process of being terminated */
203 ISER_CONN_DOWN
, /* shut down */
207 enum iser_task_status
{
208 ISER_TASK_STATUS_INIT
= 0,
209 ISER_TASK_STATUS_STARTED
,
210 ISER_TASK_STATUS_COMPLETED
214 ISER_DIR_IN
= 0, /* to initiator */
215 ISER_DIR_OUT
, /* from initiator */
220 * struct iser_data_buf - iSER data buffer
222 * @sg: pointer to the sg list
223 * @size: num entries of this sg
224 * @data_len: total beffer byte len
225 * @dma_nents: returned by dma_map_sg
227 struct iser_data_buf
{
228 struct scatterlist
*sg
;
230 unsigned long data_len
;
231 unsigned int dma_nents
;
234 /* fwd declarations */
236 struct iscsi_iser_task
;
237 struct iscsi_endpoint
;
238 struct iser_reg_resources
;
241 * struct iser_mem_reg - iSER memory registration info
243 * @sge: memory region sg element
244 * @rkey: memory region remote key
245 * @mem_h: pointer to registration context (FMR/Fastreg)
247 struct iser_mem_reg
{
253 enum iser_desc_type
{
255 ISCSI_TX_SCSI_COMMAND
,
259 /* Maximum number of work requests per task:
260 * Data memory region local invalidate + fast registration
261 * Protection memory region local invalidate + fast registration
262 * Signature memory region local invalidate + fast registration
265 #define ISER_MAX_WRS 7
268 * struct iser_tx_desc - iSER TX descriptor
270 * @iser_header: iser header
271 * @iscsi_header: iscsi header
272 * @type: command/control/dataout
273 * @dam_addr: header buffer dma_address
274 * @tx_sg: sg[0] points to iser/iscsi headers
275 * sg[1] optionally points to either of immediate data
276 * unsolicited data-out or control
277 * @num_sge: number sges used on this TX task
278 * @mapped: Is the task header mapped
279 * @wr_idx: Current WR index
280 * @wrs: Array of WRs per task
281 * @data_reg: Data buffer registration details
282 * @prot_reg: Protection buffer registration details
283 * @sig_attrs: Signature attributes
285 struct iser_tx_desc
{
286 struct iser_hdr iser_header
;
287 struct iscsi_hdr iscsi_header
;
288 enum iser_desc_type type
;
290 struct ib_sge tx_sg
[2];
296 struct ib_send_wr send
;
297 struct ib_reg_wr fast_reg
;
298 struct ib_sig_handover_wr sig
;
300 struct iser_mem_reg data_reg
;
301 struct iser_mem_reg prot_reg
;
302 struct ib_sig_attrs sig_attrs
;
305 #define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \
306 sizeof(u64) + sizeof(struct ib_sge) + \
307 sizeof(struct ib_cqe)))
309 * struct iser_rx_desc - iSER RX descriptor
311 * @iser_header: iser header
312 * @iscsi_header: iscsi header
313 * @data: received data segment
314 * @dma_addr: receive buffer dma address
315 * @rx_sg: ib_sge of receive buffer
316 * @pad: for sense data TODO: Modify to maximum sense length supported
318 struct iser_rx_desc
{
319 struct iser_hdr iser_header
;
320 struct iscsi_hdr iscsi_header
;
321 char data
[ISER_RECV_DATA_SEG_LEN
];
325 char pad
[ISER_RX_PAD_SIZE
];
329 * struct iser_login_desc - iSER login descriptor
331 * @req: pointer to login request buffer
332 * @resp: pointer to login response buffer
333 * @req_dma: DMA address of login request buffer
334 * @rsp_dma: DMA address of login response buffer
335 * @sge: IB sge for login post recv
336 * @cqe: completion handler
338 struct iser_login_desc
{
345 } __attribute__((packed
));
349 struct iscsi_iser_task
;
352 * struct iser_comp - iSER completion context
354 * @cq: completion queue
355 * @active_qps: Number of active QPs attached
356 * to completion context
364 * struct iser_device - Memory registration operations
365 * per-device registration schemes
367 * @alloc_reg_res: Allocate registration resources
368 * @free_reg_res: Free registration resources
369 * @fast_reg_mem: Register memory buffers
370 * @unreg_mem: Un-register memory buffers
371 * @reg_desc_get: Get a registration descriptor for pool
372 * @reg_desc_put: Get a registration descriptor to pool
374 struct iser_reg_ops
{
375 int (*alloc_reg_res
)(struct ib_conn
*ib_conn
,
378 void (*free_reg_res
)(struct ib_conn
*ib_conn
);
379 int (*reg_mem
)(struct iscsi_iser_task
*iser_task
,
380 struct iser_data_buf
*mem
,
381 struct iser_reg_resources
*rsc
,
382 struct iser_mem_reg
*reg
);
383 void (*unreg_mem
)(struct iscsi_iser_task
*iser_task
,
384 enum iser_data_dir cmd_dir
);
385 struct iser_fr_desc
* (*reg_desc_get
)(struct ib_conn
*ib_conn
);
386 void (*reg_desc_put
)(struct ib_conn
*ib_conn
,
387 struct iser_fr_desc
*desc
);
391 * struct iser_device - iSER device handle
393 * @ib_device: RDMA device
394 * @pd: Protection Domain for this device
395 * @mr: Global DMA memory region
396 * @event_handler: IB events handle routine
397 * @ig_list: entry in devices list
398 * @refcount: Reference counter, dominated by open iser connections
399 * @comps_used: Number of completion contexts used, Min between online
400 * cpus and device max completion vectors
401 * @comps: Dinamically allocated array of completion handlers
402 * @reg_ops: Registration ops
405 struct ib_device
*ib_device
;
408 struct ib_event_handler event_handler
;
409 struct list_head ig_list
;
412 struct iser_comp
*comps
;
413 const struct iser_reg_ops
*reg_ops
;
416 #define ISER_CHECK_GUARD 0xc0
417 #define ISER_CHECK_REFTAG 0x0f
418 #define ISER_CHECK_APPTAG 0x30
421 * struct iser_reg_resources - Fast registration recources
424 * @fmr_pool: pool of fmrs
425 * @page_vec: fast reg page list used by fmr pool
426 * @mr_valid: is mr valid indicator
428 struct iser_reg_resources
{
431 struct ib_fmr_pool
*fmr_pool
;
433 struct iser_page_vec
*page_vec
;
438 * struct iser_pi_context - Protection information context
440 * @rsc: protection buffer registration resources
441 * @sig_mr: signature enable memory region
442 * @sig_mr_valid: is sig_mr valid indicator
443 * @sig_protected: is region protected indicator
445 struct iser_pi_context
{
446 struct iser_reg_resources rsc
;
447 struct ib_mr
*sig_mr
;
453 * struct iser_fr_desc - Fast registration descriptor
455 * @list: entry in connection fastreg pool
456 * @rsc: data buffer registration resources
457 * @pi_ctx: protection information context
459 struct iser_fr_desc
{
460 struct list_head list
;
461 struct iser_reg_resources rsc
;
462 struct iser_pi_context
*pi_ctx
;
466 * struct iser_fr_pool: connection fast registration pool
468 * @list: list of fastreg descriptors
469 * @lock: protects fmr/fastreg pool
470 * @size: size of the pool
472 struct iser_fr_pool
{
473 struct list_head list
;
479 * struct ib_conn - Infiniband related objects
481 * @cma_id: rdma_cm connection maneger handle
482 * @qp: Connection Queue-pair
483 * @post_recv_buf_count: post receive counter
484 * @sig_count: send work request signal count
485 * @rx_wr: receive work request for batch posts
486 * @device: reference to iser device
487 * @comp: iser completion context
488 * @fr_pool: connection fast registration poool
489 * @pi_support: Indicate device T10-PI support
490 * @last: last send wr to signal all flush errors were drained
491 * @last_cqe: cqe handler for last wr
492 * @last_comp: completes when all connection completions consumed
495 struct rdma_cm_id
*cma_id
;
497 int post_recv_buf_count
;
499 struct ib_recv_wr rx_wr
[ISER_MIN_POSTED_RX
];
500 struct iser_device
*device
;
501 struct iser_comp
*comp
;
502 struct iser_fr_pool fr_pool
;
504 struct ib_send_wr last
;
505 struct ib_cqe last_cqe
;
506 struct ib_cqe reg_cqe
;
507 struct completion last_comp
;
511 * struct iser_conn - iSER connection context
513 * @ib_conn: connection RDMA resources
514 * @iscsi_conn: link to matching iscsi connection
515 * @ep: transport handle
516 * @state: connection logical state
517 * @qp_max_recv_dtos: maximum number of data outs, corresponds
518 * to max number of post recvs
519 * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1)
520 * @min_posted_rx: (qp_max_recv_dtos >> 2)
521 * @max_cmds: maximum cmds allowed for this connection
522 * @name: connection peer portal
523 * @release_work: deffered work for release job
524 * @state_mutex: protects iser onnection state
525 * @stop_completion: conn_stop completion
526 * @ib_completion: RDMA cleanup completion
527 * @up_completion: connection establishment completed
528 * (state is ISER_CONN_UP)
529 * @conn_list: entry in ig conn list
530 * @login_desc: login descriptor
531 * @rx_desc_head: head of rx_descs cyclic buffer
532 * @rx_descs: rx buffers array (cyclic buffer)
533 * @num_rx_descs: number of rx descriptors
534 * @scsi_sg_tablesize: scsi host sg_tablesize
535 * @scsi_max_sectors: scsi host max sectors
538 struct ib_conn ib_conn
;
539 struct iscsi_conn
*iscsi_conn
;
540 struct iscsi_endpoint
*ep
;
541 enum iser_conn_state state
;
542 unsigned qp_max_recv_dtos
;
543 unsigned qp_max_recv_dtos_mask
;
544 unsigned min_posted_rx
;
546 char name
[ISER_OBJECT_NAME_SIZE
];
547 struct work_struct release_work
;
548 struct mutex state_mutex
;
549 struct completion stop_completion
;
550 struct completion ib_completion
;
551 struct completion up_completion
;
552 struct list_head conn_list
;
553 struct iser_login_desc login_desc
;
554 unsigned int rx_desc_head
;
555 struct iser_rx_desc
*rx_descs
;
557 unsigned short scsi_sg_tablesize
;
558 unsigned int scsi_max_sectors
;
562 * struct iscsi_iser_task - iser task context
564 * @desc: TX descriptor
565 * @iser_conn: link to iser connection
566 * @status: current task status
567 * @sc: link to scsi command
568 * @command_sent: indicate if command was sent
569 * @dir: iser data direction
570 * @rdma_reg: task rdma registration desc
571 * @data: iser data buffer desc
572 * @prot: iser protection buffer desc
574 struct iscsi_iser_task
{
575 struct iser_tx_desc desc
;
576 struct iser_conn
*iser_conn
;
577 enum iser_task_status status
;
578 struct scsi_cmnd
*sc
;
580 int dir
[ISER_DIRS_NUM
];
581 struct iser_mem_reg rdma_reg
[ISER_DIRS_NUM
];
582 struct iser_data_buf data
[ISER_DIRS_NUM
];
583 struct iser_data_buf prot
[ISER_DIRS_NUM
];
586 struct iser_page_vec
{
589 struct ib_mr fake_mr
;
593 * struct iser_global: iSER global context
595 * @device_list_mutex: protects device_list
596 * @device_list: iser devices global list
597 * @connlist_mutex: protects connlist
598 * @connlist: iser connections global list
599 * @desc_cache: kmem cache for tx dataout
602 struct mutex device_list_mutex
;
603 struct list_head device_list
;
604 struct mutex connlist_mutex
;
605 struct list_head connlist
;
606 struct kmem_cache
*desc_cache
;
609 extern struct iser_global ig
;
610 extern int iser_debug_level
;
611 extern bool iser_pi_enable
;
612 extern int iser_pi_guard
;
613 extern unsigned int iser_max_sectors
;
614 extern bool iser_always_reg
;
616 int iser_assign_reg_ops(struct iser_device
*device
);
618 int iser_send_control(struct iscsi_conn
*conn
,
619 struct iscsi_task
*task
);
621 int iser_send_command(struct iscsi_conn
*conn
,
622 struct iscsi_task
*task
);
624 int iser_send_data_out(struct iscsi_conn
*conn
,
625 struct iscsi_task
*task
,
626 struct iscsi_data
*hdr
);
628 void iscsi_iser_recv(struct iscsi_conn
*conn
,
629 struct iscsi_hdr
*hdr
,
633 void iser_conn_init(struct iser_conn
*iser_conn
);
635 void iser_conn_release(struct iser_conn
*iser_conn
);
637 int iser_conn_terminate(struct iser_conn
*iser_conn
);
639 void iser_release_work(struct work_struct
*work
);
641 void iser_err_comp(struct ib_wc
*wc
, const char *type
);
642 void iser_login_rsp(struct ib_cq
*cq
, struct ib_wc
*wc
);
643 void iser_task_rsp(struct ib_cq
*cq
, struct ib_wc
*wc
);
644 void iser_cmd_comp(struct ib_cq
*cq
, struct ib_wc
*wc
);
645 void iser_ctrl_comp(struct ib_cq
*cq
, struct ib_wc
*wc
);
646 void iser_dataout_comp(struct ib_cq
*cq
, struct ib_wc
*wc
);
647 void iser_reg_comp(struct ib_cq
*cq
, struct ib_wc
*wc
);
648 void iser_last_comp(struct ib_cq
*cq
, struct ib_wc
*wc
);
650 void iser_task_rdma_init(struct iscsi_iser_task
*task
);
652 void iser_task_rdma_finalize(struct iscsi_iser_task
*task
);
654 void iser_free_rx_descriptors(struct iser_conn
*iser_conn
);
656 void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task
*iser_task
,
657 struct iser_data_buf
*mem
,
658 enum iser_data_dir cmd_dir
);
660 int iser_reg_rdma_mem(struct iscsi_iser_task
*task
,
661 enum iser_data_dir dir
,
663 void iser_unreg_rdma_mem(struct iscsi_iser_task
*task
,
664 enum iser_data_dir dir
);
666 int iser_connect(struct iser_conn
*iser_conn
,
667 struct sockaddr
*src_addr
,
668 struct sockaddr
*dst_addr
,
671 void iser_unreg_mem_fmr(struct iscsi_iser_task
*iser_task
,
672 enum iser_data_dir cmd_dir
);
673 void iser_unreg_mem_fastreg(struct iscsi_iser_task
*iser_task
,
674 enum iser_data_dir cmd_dir
);
676 int iser_post_recvl(struct iser_conn
*iser_conn
);
677 int iser_post_recvm(struct iser_conn
*iser_conn
, int count
);
678 int iser_post_send(struct ib_conn
*ib_conn
, struct iser_tx_desc
*tx_desc
,
681 int iser_dma_map_task_data(struct iscsi_iser_task
*iser_task
,
682 struct iser_data_buf
*data
,
683 enum iser_data_dir iser_dir
,
684 enum dma_data_direction dma_dir
);
686 void iser_dma_unmap_task_data(struct iscsi_iser_task
*iser_task
,
687 struct iser_data_buf
*data
,
688 enum dma_data_direction dir
);
690 int iser_initialize_task_headers(struct iscsi_task
*task
,
691 struct iser_tx_desc
*tx_desc
);
692 int iser_alloc_rx_descriptors(struct iser_conn
*iser_conn
,
693 struct iscsi_session
*session
);
694 int iser_alloc_fmr_pool(struct ib_conn
*ib_conn
,
697 void iser_free_fmr_pool(struct ib_conn
*ib_conn
);
698 int iser_alloc_fastreg_pool(struct ib_conn
*ib_conn
,
701 void iser_free_fastreg_pool(struct ib_conn
*ib_conn
);
702 u8
iser_check_task_pi_status(struct iscsi_iser_task
*iser_task
,
703 enum iser_data_dir cmd_dir
, sector_t
*sector
);
704 struct iser_fr_desc
*
705 iser_reg_desc_get_fr(struct ib_conn
*ib_conn
);
707 iser_reg_desc_put_fr(struct ib_conn
*ib_conn
,
708 struct iser_fr_desc
*desc
);
709 struct iser_fr_desc
*
710 iser_reg_desc_get_fmr(struct ib_conn
*ib_conn
);
712 iser_reg_desc_put_fmr(struct ib_conn
*ib_conn
,
713 struct iser_fr_desc
*desc
);
715 static inline struct ib_send_wr
*
716 iser_tx_next_wr(struct iser_tx_desc
*tx_desc
)
718 struct ib_send_wr
*cur_wr
= &tx_desc
->wrs
[tx_desc
->wr_idx
].send
;
719 struct ib_send_wr
*last_wr
;
721 if (tx_desc
->wr_idx
) {
722 last_wr
= &tx_desc
->wrs
[tx_desc
->wr_idx
- 1].send
;
723 last_wr
->next
= cur_wr
;
730 static inline struct iser_conn
*
731 to_iser_conn(struct ib_conn
*ib_conn
)
733 return container_of(ib_conn
, struct iser_conn
, ib_conn
);
736 static inline struct iser_rx_desc
*
737 iser_rx(struct ib_cqe
*cqe
)
739 return container_of(cqe
, struct iser_rx_desc
, cqe
);
742 static inline struct iser_tx_desc
*
743 iser_tx(struct ib_cqe
*cqe
)
745 return container_of(cqe
, struct iser_tx_desc
, cqe
);
748 static inline struct iser_login_desc
*
749 iser_login(struct ib_cqe
*cqe
)
751 return container_of(cqe
, struct iser_login_desc
, cqe
);