tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * iSER transport for the Open iSCSI Initiator & iSER transport internals
3 *
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
8 *
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.
12 *
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:
18 *
19 * Redistribution and use in source and binary forms, with or
20 * without modification, are permitted provided that the following
21 * conditions are met:
22 *
23 * - Redistributions of source code must retain the above
24 * copyright notice, this list of conditions and the following
25 * disclaimer.
26 *
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.
31 *
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
39 * SOFTWARE.
40 */
41#ifndef __ISCSI_ISER_H__
42#define __ISCSI_ISER_H__
43
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>
51#include <scsi/iser.h>
52
53#include <linux/interrupt.h>
54#include <linux/wait.h>
55#include <linux/sched.h>
56#include <linux/list.h>
57#include <linux/slab.h>
58#include <linux/dma-mapping.h>
59#include <linux/mutex.h>
60#include <linux/mempool.h>
61#include <linux/uio.h>
62
63#include <linux/socket.h>
64#include <linux/in.h>
65#include <linux/in6.h>
66
67#include <rdma/ib_verbs.h>
68#include <rdma/ib_fmr_pool.h>
69#include <rdma/rdma_cm.h>
70
71#define DRV_NAME "iser"
72#define PFX DRV_NAME ": "
73#define DRV_VER "1.6"
74
75#define iser_dbg(fmt, arg...) \
76 do { \
77 if (unlikely(iser_debug_level > 2)) \
78 printk(KERN_DEBUG PFX "%s: " fmt,\
79 __func__ , ## arg); \
80 } while (0)
81
82#define iser_warn(fmt, arg...) \
83 do { \
84 if (unlikely(iser_debug_level > 0)) \
85 pr_warn(PFX "%s: " fmt, \
86 __func__ , ## arg); \
87 } while (0)
88
89#define iser_info(fmt, arg...) \
90 do { \
91 if (unlikely(iser_debug_level > 1)) \
92 pr_info(PFX "%s: " fmt, \
93 __func__ , ## arg); \
94 } while (0)
95
96#define iser_err(fmt, arg...) \
97 pr_err(PFX "%s: " fmt, __func__ , ## arg)
98
99/* Default support is 512KB I/O size */
100#define ISER_DEF_MAX_SECTORS 1024
101#define ISCSI_ISER_DEF_SG_TABLESIZE \
102 ((ISER_DEF_MAX_SECTORS * SECTOR_SIZE) >> ilog2(SZ_4K))
103/* Maximum support is 16MB I/O size */
104#define ISCSI_ISER_MAX_SG_TABLESIZE ((32768 * SECTOR_SIZE) >> ilog2(SZ_4K))
105
106#define ISER_DEF_XMIT_CMDS_DEFAULT 512
107#if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT
108 #define ISER_DEF_XMIT_CMDS_MAX ISCSI_DEF_XMIT_CMDS_MAX
109#else
110 #define ISER_DEF_XMIT_CMDS_MAX ISER_DEF_XMIT_CMDS_DEFAULT
111#endif
112#define ISER_DEF_CMD_PER_LUN ISER_DEF_XMIT_CMDS_MAX
113
114/* QP settings */
115/* Maximal bounds on received asynchronous PDUs */
116#define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */
117
118#define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), *
119 * SCSI_TMFUNC(2), LOGOUT(1) */
120
121#define ISER_QP_MAX_RECV_DTOS (ISER_DEF_XMIT_CMDS_MAX)
122
123#define ISER_MIN_POSTED_RX (ISER_DEF_XMIT_CMDS_MAX >> 2)
124
125/* the max TX (send) WR supported by the iSER QP is defined by *
126 * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect *
127 * to have at max for SCSI command. The tx posting & completion handling code *
128 * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
129 * send WR. D=8 comes from 64K/8K */
130
131#define ISER_INFLIGHT_DATAOUTS 8
132
133#define ISER_QP_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \
134 (1 + ISER_INFLIGHT_DATAOUTS) + \
135 ISER_MAX_TX_MISC_PDUS + \
136 ISER_MAX_RX_MISC_PDUS)
137
138/* Max registration work requests per command */
139#define ISER_MAX_REG_WR_PER_CMD 5
140
141/* For Signature we don't support DATAOUTs so no need to make room for them */
142#define ISER_QP_SIG_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \
143 (1 + ISER_MAX_REG_WR_PER_CMD) + \
144 ISER_MAX_TX_MISC_PDUS + \
145 ISER_MAX_RX_MISC_PDUS)
146
147#define ISER_GET_MAX_XMIT_CMDS(send_wr) ((send_wr \
148 - ISER_MAX_TX_MISC_PDUS \
149 - ISER_MAX_RX_MISC_PDUS) / \
150 (1 + ISER_INFLIGHT_DATAOUTS))
151
152#define ISER_SIGNAL_CMD_COUNT 32
153
154/* Constant PDU lengths calculations */
155#define ISER_HEADERS_LEN (sizeof(struct iser_ctrl) + sizeof(struct iscsi_hdr))
156
157#define ISER_RECV_DATA_SEG_LEN 128
158#define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
159#define ISER_RX_LOGIN_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
160
161/* Length of an object name string */
162#define ISER_OBJECT_NAME_SIZE 64
163
164enum iser_conn_state {
165 ISER_CONN_INIT, /* descriptor allocd, no conn */
166 ISER_CONN_PENDING, /* in the process of being established */
167 ISER_CONN_UP, /* up and running */
168 ISER_CONN_TERMINATING, /* in the process of being terminated */
169 ISER_CONN_DOWN, /* shut down */
170 ISER_CONN_STATES_NUM
171};
172
173enum iser_task_status {
174 ISER_TASK_STATUS_INIT = 0,
175 ISER_TASK_STATUS_STARTED,
176 ISER_TASK_STATUS_COMPLETED
177};
178
179enum iser_data_dir {
180 ISER_DIR_IN = 0, /* to initiator */
181 ISER_DIR_OUT, /* from initiator */
182 ISER_DIRS_NUM
183};
184
185/**
186 * struct iser_data_buf - iSER data buffer
187 *
188 * @sg: pointer to the sg list
189 * @size: num entries of this sg
190 * @data_len: total beffer byte len
191 * @dma_nents: returned by dma_map_sg
192 */
193struct iser_data_buf {
194 struct scatterlist *sg;
195 int size;
196 unsigned long data_len;
197 int dma_nents;
198};
199
200/* fwd declarations */
201struct iser_device;
202struct iscsi_iser_task;
203struct iscsi_endpoint;
204struct iser_reg_resources;
205
206/**
207 * struct iser_mem_reg - iSER memory registration info
208 *
209 * @sge: memory region sg element
210 * @rkey: memory region remote key
211 * @mem_h: pointer to registration context (FMR/Fastreg)
212 */
213struct iser_mem_reg {
214 struct ib_sge sge;
215 u32 rkey;
216 void *mem_h;
217};
218
219enum iser_desc_type {
220 ISCSI_TX_CONTROL ,
221 ISCSI_TX_SCSI_COMMAND,
222 ISCSI_TX_DATAOUT
223};
224
225/**
226 * struct iser_tx_desc - iSER TX descriptor
227 *
228 * @iser_header: iser header
229 * @iscsi_header: iscsi header
230 * @type: command/control/dataout
231 * @dma_addr: header buffer dma_address
232 * @tx_sg: sg[0] points to iser/iscsi headers
233 * sg[1] optionally points to either of immediate data
234 * unsolicited data-out or control
235 * @num_sge: number sges used on this TX task
236 * @cqe: completion handler
237 * @mapped: Is the task header mapped
238 * @reg_wr: registration WR
239 * @send_wr: send WR
240 * @inv_wr: invalidate WR
241 */
242struct iser_tx_desc {
243 struct iser_ctrl iser_header;
244 struct iscsi_hdr iscsi_header;
245 enum iser_desc_type type;
246 u64 dma_addr;
247 struct ib_sge tx_sg[2];
248 int num_sge;
249 struct ib_cqe cqe;
250 bool mapped;
251 struct ib_reg_wr reg_wr;
252 struct ib_send_wr send_wr;
253 struct ib_send_wr inv_wr;
254};
255
256#define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \
257 sizeof(u64) + sizeof(struct ib_sge) + \
258 sizeof(struct ib_cqe)))
259/**
260 * struct iser_rx_desc - iSER RX descriptor
261 *
262 * @iser_header: iser header
263 * @iscsi_header: iscsi header
264 * @data: received data segment
265 * @dma_addr: receive buffer dma address
266 * @rx_sg: ib_sge of receive buffer
267 * @cqe: completion handler
268 * @pad: for sense data TODO: Modify to maximum sense length supported
269 */
270struct iser_rx_desc {
271 struct iser_ctrl iser_header;
272 struct iscsi_hdr iscsi_header;
273 char data[ISER_RECV_DATA_SEG_LEN];
274 u64 dma_addr;
275 struct ib_sge rx_sg;
276 struct ib_cqe cqe;
277 char pad[ISER_RX_PAD_SIZE];
278} __packed;
279
280/**
281 * struct iser_login_desc - iSER login descriptor
282 *
283 * @req: pointer to login request buffer
284 * @rsp: pointer to login response buffer
285 * @req_dma: DMA address of login request buffer
286 * @rsp_dma: DMA address of login response buffer
287 * @sge: IB sge for login post recv
288 * @cqe: completion handler
289 */
290struct iser_login_desc {
291 void *req;
292 void *rsp;
293 u64 req_dma;
294 u64 rsp_dma;
295 struct ib_sge sge;
296 struct ib_cqe cqe;
297} __packed;
298
299struct iser_conn;
300struct ib_conn;
301struct iscsi_iser_task;
302
303/**
304 * struct iser_comp - iSER completion context
305 *
306 * @cq: completion queue
307 * @active_qps: Number of active QPs attached
308 * to completion context
309 */
310struct iser_comp {
311 struct ib_cq *cq;
312 int active_qps;
313};
314
315/**
316 * struct iser_reg_ops - Memory registration operations
317 * per-device registration schemes
318 *
319 * @alloc_reg_res: Allocate registration resources
320 * @free_reg_res: Free registration resources
321 * @reg_mem: Register memory buffers
322 * @unreg_mem: Un-register memory buffers
323 * @reg_desc_get: Get a registration descriptor for pool
324 * @reg_desc_put: Get a registration descriptor to pool
325 */
326struct iser_reg_ops {
327 int (*alloc_reg_res)(struct ib_conn *ib_conn,
328 unsigned cmds_max,
329 unsigned int size);
330 void (*free_reg_res)(struct ib_conn *ib_conn);
331 int (*reg_mem)(struct iscsi_iser_task *iser_task,
332 struct iser_data_buf *mem,
333 struct iser_reg_resources *rsc,
334 struct iser_mem_reg *reg);
335 void (*unreg_mem)(struct iscsi_iser_task *iser_task,
336 enum iser_data_dir cmd_dir);
337 struct iser_fr_desc * (*reg_desc_get)(struct ib_conn *ib_conn);
338 void (*reg_desc_put)(struct ib_conn *ib_conn,
339 struct iser_fr_desc *desc);
340};
341
342/**
343 * struct iser_device - iSER device handle
344 *
345 * @ib_device: RDMA device
346 * @pd: Protection Domain for this device
347 * @mr: Global DMA memory region
348 * @event_handler: IB events handle routine
349 * @ig_list: entry in devices list
350 * @refcount: Reference counter, dominated by open iser connections
351 * @comps_used: Number of completion contexts used, Min between online
352 * cpus and device max completion vectors
353 * @comps: Dinamically allocated array of completion handlers
354 * @reg_ops: Registration ops
355 * @remote_inv_sup: Remote invalidate is supported on this device
356 */
357struct iser_device {
358 struct ib_device *ib_device;
359 struct ib_pd *pd;
360 struct ib_event_handler event_handler;
361 struct list_head ig_list;
362 int refcount;
363 int comps_used;
364 struct iser_comp *comps;
365 const struct iser_reg_ops *reg_ops;
366 bool remote_inv_sup;
367};
368
369/**
370 * struct iser_reg_resources - Fast registration resources
371 *
372 * @mr: memory region
373 * @fmr_pool: pool of fmrs
374 * @sig_mr: signature memory region
375 * @page_vec: fast reg page list used by fmr pool
376 * @mr_valid: is mr valid indicator
377 */
378struct iser_reg_resources {
379 union {
380 struct ib_mr *mr;
381 struct ib_fmr_pool *fmr_pool;
382 };
383 struct ib_mr *sig_mr;
384 struct iser_page_vec *page_vec;
385 u8 mr_valid:1;
386};
387
388/**
389 * struct iser_fr_desc - Fast registration descriptor
390 *
391 * @list: entry in connection fastreg pool
392 * @rsc: data buffer registration resources
393 * @sig_protected: is region protected indicator
394 */
395struct iser_fr_desc {
396 struct list_head list;
397 struct iser_reg_resources rsc;
398 bool sig_protected;
399 struct list_head all_list;
400};
401
402/**
403 * struct iser_fr_pool - connection fast registration pool
404 *
405 * @list: list of fastreg descriptors
406 * @lock: protects fmr/fastreg pool
407 * @size: size of the pool
408 */
409struct iser_fr_pool {
410 struct list_head list;
411 spinlock_t lock;
412 int size;
413 struct list_head all_list;
414};
415
416/**
417 * struct ib_conn - Infiniband related objects
418 *
419 * @cma_id: rdma_cm connection maneger handle
420 * @qp: Connection Queue-pair
421 * @post_recv_buf_count: post receive counter
422 * @sig_count: send work request signal count
423 * @rx_wr: receive work request for batch posts
424 * @device: reference to iser device
425 * @comp: iser completion context
426 * @fr_pool: connection fast registration poool
427 * @pi_support: Indicate device T10-PI support
428 * @reg_cqe: completion handler
429 */
430struct ib_conn {
431 struct rdma_cm_id *cma_id;
432 struct ib_qp *qp;
433 int post_recv_buf_count;
434 u8 sig_count;
435 struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX];
436 struct iser_device *device;
437 struct iser_comp *comp;
438 struct iser_fr_pool fr_pool;
439 bool pi_support;
440 struct ib_cqe reg_cqe;
441};
442
443/**
444 * struct iser_conn - iSER connection context
445 *
446 * @ib_conn: connection RDMA resources
447 * @iscsi_conn: link to matching iscsi connection
448 * @ep: transport handle
449 * @state: connection logical state
450 * @qp_max_recv_dtos: maximum number of data outs, corresponds
451 * to max number of post recvs
452 * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1)
453 * @min_posted_rx: (qp_max_recv_dtos >> 2)
454 * @max_cmds: maximum cmds allowed for this connection
455 * @name: connection peer portal
456 * @release_work: deffered work for release job
457 * @state_mutex: protects iser onnection state
458 * @stop_completion: conn_stop completion
459 * @ib_completion: RDMA cleanup completion
460 * @up_completion: connection establishment completed
461 * (state is ISER_CONN_UP)
462 * @conn_list: entry in ig conn list
463 * @login_desc: login descriptor
464 * @rx_desc_head: head of rx_descs cyclic buffer
465 * @rx_descs: rx buffers array (cyclic buffer)
466 * @num_rx_descs: number of rx descriptors
467 * @scsi_sg_tablesize: scsi host sg_tablesize
468 * @pages_per_mr: maximum pages available for registration
469 * @snd_w_inv: connection uses remote invalidation
470 */
471struct iser_conn {
472 struct ib_conn ib_conn;
473 struct iscsi_conn *iscsi_conn;
474 struct iscsi_endpoint *ep;
475 enum iser_conn_state state;
476 unsigned qp_max_recv_dtos;
477 unsigned qp_max_recv_dtos_mask;
478 unsigned min_posted_rx;
479 u16 max_cmds;
480 char name[ISER_OBJECT_NAME_SIZE];
481 struct work_struct release_work;
482 struct mutex state_mutex;
483 struct completion stop_completion;
484 struct completion ib_completion;
485 struct completion up_completion;
486 struct list_head conn_list;
487 struct iser_login_desc login_desc;
488 unsigned int rx_desc_head;
489 struct iser_rx_desc *rx_descs;
490 u32 num_rx_descs;
491 unsigned short scsi_sg_tablesize;
492 unsigned short pages_per_mr;
493 bool snd_w_inv;
494};
495
496/**
497 * struct iscsi_iser_task - iser task context
498 *
499 * @desc: TX descriptor
500 * @iser_conn: link to iser connection
501 * @status: current task status
502 * @sc: link to scsi command
503 * @command_sent: indicate if command was sent
504 * @dir: iser data direction
505 * @rdma_reg: task rdma registration desc
506 * @data: iser data buffer desc
507 * @prot: iser protection buffer desc
508 */
509struct iscsi_iser_task {
510 struct iser_tx_desc desc;
511 struct iser_conn *iser_conn;
512 enum iser_task_status status;
513 struct scsi_cmnd *sc;
514 int command_sent;
515 int dir[ISER_DIRS_NUM];
516 struct iser_mem_reg rdma_reg[ISER_DIRS_NUM];
517 struct iser_data_buf data[ISER_DIRS_NUM];
518 struct iser_data_buf prot[ISER_DIRS_NUM];
519};
520
521struct iser_page_vec {
522 u64 *pages;
523 int npages;
524 struct ib_mr fake_mr;
525};
526
527/**
528 * struct iser_global - iSER global context
529 *
530 * @device_list_mutex: protects device_list
531 * @device_list: iser devices global list
532 * @connlist_mutex: protects connlist
533 * @connlist: iser connections global list
534 * @desc_cache: kmem cache for tx dataout
535 */
536struct iser_global {
537 struct mutex device_list_mutex;
538 struct list_head device_list;
539 struct mutex connlist_mutex;
540 struct list_head connlist;
541 struct kmem_cache *desc_cache;
542};
543
544extern struct iser_global ig;
545extern int iser_debug_level;
546extern bool iser_pi_enable;
547extern int iser_pi_guard;
548extern unsigned int iser_max_sectors;
549extern bool iser_always_reg;
550
551int iser_assign_reg_ops(struct iser_device *device);
552
553int iser_send_control(struct iscsi_conn *conn,
554 struct iscsi_task *task);
555
556int iser_send_command(struct iscsi_conn *conn,
557 struct iscsi_task *task);
558
559int iser_send_data_out(struct iscsi_conn *conn,
560 struct iscsi_task *task,
561 struct iscsi_data *hdr);
562
563void iscsi_iser_recv(struct iscsi_conn *conn,
564 struct iscsi_hdr *hdr,
565 char *rx_data,
566 int rx_data_len);
567
568void iser_conn_init(struct iser_conn *iser_conn);
569
570void iser_conn_release(struct iser_conn *iser_conn);
571
572int iser_conn_terminate(struct iser_conn *iser_conn);
573
574void iser_release_work(struct work_struct *work);
575
576void iser_err_comp(struct ib_wc *wc, const char *type);
577void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc);
578void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc);
579void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc);
580void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc);
581void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc);
582void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc);
583
584void iser_task_rdma_init(struct iscsi_iser_task *task);
585
586void iser_task_rdma_finalize(struct iscsi_iser_task *task);
587
588void iser_free_rx_descriptors(struct iser_conn *iser_conn);
589
590void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
591 struct iser_data_buf *mem,
592 enum iser_data_dir cmd_dir);
593
594int iser_reg_rdma_mem(struct iscsi_iser_task *task,
595 enum iser_data_dir dir,
596 bool all_imm);
597void iser_unreg_rdma_mem(struct iscsi_iser_task *task,
598 enum iser_data_dir dir);
599
600int iser_connect(struct iser_conn *iser_conn,
601 struct sockaddr *src_addr,
602 struct sockaddr *dst_addr,
603 int non_blocking);
604
605void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
606 enum iser_data_dir cmd_dir);
607void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
608 enum iser_data_dir cmd_dir);
609
610int iser_post_recvl(struct iser_conn *iser_conn);
611int iser_post_recvm(struct iser_conn *iser_conn, int count);
612int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
613 bool signal);
614
615int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
616 struct iser_data_buf *data,
617 enum iser_data_dir iser_dir,
618 enum dma_data_direction dma_dir);
619
620void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
621 struct iser_data_buf *data,
622 enum dma_data_direction dir);
623
624int iser_initialize_task_headers(struct iscsi_task *task,
625 struct iser_tx_desc *tx_desc);
626int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
627 struct iscsi_session *session);
628int iser_alloc_fmr_pool(struct ib_conn *ib_conn,
629 unsigned cmds_max,
630 unsigned int size);
631void iser_free_fmr_pool(struct ib_conn *ib_conn);
632int iser_alloc_fastreg_pool(struct ib_conn *ib_conn,
633 unsigned cmds_max,
634 unsigned int size);
635void iser_free_fastreg_pool(struct ib_conn *ib_conn);
636u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
637 enum iser_data_dir cmd_dir, sector_t *sector);
638struct iser_fr_desc *
639iser_reg_desc_get_fr(struct ib_conn *ib_conn);
640void
641iser_reg_desc_put_fr(struct ib_conn *ib_conn,
642 struct iser_fr_desc *desc);
643struct iser_fr_desc *
644iser_reg_desc_get_fmr(struct ib_conn *ib_conn);
645void
646iser_reg_desc_put_fmr(struct ib_conn *ib_conn,
647 struct iser_fr_desc *desc);
648
649static inline struct iser_conn *
650to_iser_conn(struct ib_conn *ib_conn)
651{
652 return container_of(ib_conn, struct iser_conn, ib_conn);
653}
654
655static inline struct iser_rx_desc *
656iser_rx(struct ib_cqe *cqe)
657{
658 return container_of(cqe, struct iser_rx_desc, cqe);
659}
660
661static inline struct iser_tx_desc *
662iser_tx(struct ib_cqe *cqe)
663{
664 return container_of(cqe, struct iser_tx_desc, cqe);
665}
666
667static inline struct iser_login_desc *
668iser_login(struct ib_cqe *cqe)
669{
670 return container_of(cqe, struct iser_login_desc, cqe);
671}
672
673#endif