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#define SHIFT_4K 12
100#define SIZE_4K (1ULL << SHIFT_4K)
101#define MASK_4K (~(SIZE_4K-1))
102
103/* Default support is 512KB I/O size */
104#define ISER_DEF_MAX_SECTORS 1024
105#define ISCSI_ISER_DEF_SG_TABLESIZE ((ISER_DEF_MAX_SECTORS * 512) >> SHIFT_4K)
106/* Maximum support is 8MB I/O size */
107#define ISCSI_ISER_MAX_SG_TABLESIZE ((16384 * 512) >> SHIFT_4K)
108
109#define ISER_DEF_XMIT_CMDS_DEFAULT 512
110#if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT
111 #define ISER_DEF_XMIT_CMDS_MAX ISCSI_DEF_XMIT_CMDS_MAX
112#else
113 #define ISER_DEF_XMIT_CMDS_MAX ISER_DEF_XMIT_CMDS_DEFAULT
114#endif
115#define ISER_DEF_CMD_PER_LUN ISER_DEF_XMIT_CMDS_MAX
116
117/* QP settings */
118/* Maximal bounds on received asynchronous PDUs */
119#define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */
120
121#define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), *
122 * SCSI_TMFUNC(2), LOGOUT(1) */
123
124#define ISER_QP_MAX_RECV_DTOS (ISER_DEF_XMIT_CMDS_MAX)
125
126#define ISER_MIN_POSTED_RX (ISER_DEF_XMIT_CMDS_MAX >> 2)
127
128/* the max TX (send) WR supported by the iSER QP is defined by *
129 * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect *
130 * to have at max for SCSI command. The tx posting & completion handling code *
131 * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
132 * send WR. D=8 comes from 64K/8K */
133
134#define ISER_INFLIGHT_DATAOUTS 8
135
136#define ISER_QP_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \
137 (1 + ISER_INFLIGHT_DATAOUTS) + \
138 ISER_MAX_TX_MISC_PDUS + \
139 ISER_MAX_RX_MISC_PDUS)
140
141/* Max registration work requests per command */
142#define ISER_MAX_REG_WR_PER_CMD 5
143
144/* For Signature we don't support DATAOUTs so no need to make room for them */
145#define ISER_QP_SIG_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \
146 (1 + ISER_MAX_REG_WR_PER_CMD) + \
147 ISER_MAX_TX_MISC_PDUS + \
148 ISER_MAX_RX_MISC_PDUS)
149
150#define ISER_GET_MAX_XMIT_CMDS(send_wr) ((send_wr \
151 - ISER_MAX_TX_MISC_PDUS \
152 - ISER_MAX_RX_MISC_PDUS) / \
153 (1 + ISER_INFLIGHT_DATAOUTS))
154
155#define ISER_SIGNAL_CMD_COUNT 32
156
157/* Constant PDU lengths calculations */
158#define ISER_HEADERS_LEN (sizeof(struct iser_ctrl) + sizeof(struct iscsi_hdr))
159
160#define ISER_RECV_DATA_SEG_LEN 128
161#define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
162#define ISER_RX_LOGIN_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
163
164/* Length of an object name string */
165#define ISER_OBJECT_NAME_SIZE 64
166
167enum iser_conn_state {
168 ISER_CONN_INIT, /* descriptor allocd, no conn */
169 ISER_CONN_PENDING, /* in the process of being established */
170 ISER_CONN_UP, /* up and running */
171 ISER_CONN_TERMINATING, /* in the process of being terminated */
172 ISER_CONN_DOWN, /* shut down */
173 ISER_CONN_STATES_NUM
174};
175
176enum iser_task_status {
177 ISER_TASK_STATUS_INIT = 0,
178 ISER_TASK_STATUS_STARTED,
179 ISER_TASK_STATUS_COMPLETED
180};
181
182enum iser_data_dir {
183 ISER_DIR_IN = 0, /* to initiator */
184 ISER_DIR_OUT, /* from initiator */
185 ISER_DIRS_NUM
186};
187
188/**
189 * struct iser_data_buf - iSER data buffer
190 *
191 * @sg: pointer to the sg list
192 * @size: num entries of this sg
193 * @data_len: total beffer byte len
194 * @dma_nents: returned by dma_map_sg
195 */
196struct iser_data_buf {
197 struct scatterlist *sg;
198 int size;
199 unsigned long data_len;
200 unsigned int dma_nents;
201};
202
203/* fwd declarations */
204struct iser_device;
205struct iscsi_iser_task;
206struct iscsi_endpoint;
207struct iser_reg_resources;
208
209/**
210 * struct iser_mem_reg - iSER memory registration info
211 *
212 * @sge: memory region sg element
213 * @rkey: memory region remote key
214 * @mem_h: pointer to registration context (FMR/Fastreg)
215 */
216struct iser_mem_reg {
217 struct ib_sge sge;
218 u32 rkey;
219 void *mem_h;
220};
221
222enum iser_desc_type {
223 ISCSI_TX_CONTROL ,
224 ISCSI_TX_SCSI_COMMAND,
225 ISCSI_TX_DATAOUT
226};
227
228/* Maximum number of work requests per task:
229 * Data memory region local invalidate + fast registration
230 * Protection memory region local invalidate + fast registration
231 * Signature memory region local invalidate + fast registration
232 * PDU send
233 */
234#define ISER_MAX_WRS 7
235
236/**
237 * struct iser_tx_desc - iSER TX descriptor
238 *
239 * @iser_header: iser header
240 * @iscsi_header: iscsi header
241 * @type: command/control/dataout
242 * @dam_addr: header buffer dma_address
243 * @tx_sg: sg[0] points to iser/iscsi headers
244 * sg[1] optionally points to either of immediate data
245 * unsolicited data-out or control
246 * @num_sge: number sges used on this TX task
247 * @mapped: Is the task header mapped
248 * @wr_idx: Current WR index
249 * @wrs: Array of WRs per task
250 * @data_reg: Data buffer registration details
251 * @prot_reg: Protection buffer registration details
252 * @sig_attrs: Signature attributes
253 */
254struct iser_tx_desc {
255 struct iser_ctrl iser_header;
256 struct iscsi_hdr iscsi_header;
257 enum iser_desc_type type;
258 u64 dma_addr;
259 struct ib_sge tx_sg[2];
260 int num_sge;
261 struct ib_cqe cqe;
262 bool mapped;
263 u8 wr_idx;
264 union iser_wr {
265 struct ib_send_wr send;
266 struct ib_reg_wr fast_reg;
267 struct ib_sig_handover_wr sig;
268 } wrs[ISER_MAX_WRS];
269 struct iser_mem_reg data_reg;
270 struct iser_mem_reg prot_reg;
271 struct ib_sig_attrs sig_attrs;
272};
273
274#define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \
275 sizeof(u64) + sizeof(struct ib_sge) + \
276 sizeof(struct ib_cqe)))
277/**
278 * struct iser_rx_desc - iSER RX descriptor
279 *
280 * @iser_header: iser header
281 * @iscsi_header: iscsi header
282 * @data: received data segment
283 * @dma_addr: receive buffer dma address
284 * @rx_sg: ib_sge of receive buffer
285 * @pad: for sense data TODO: Modify to maximum sense length supported
286 */
287struct iser_rx_desc {
288 struct iser_ctrl iser_header;
289 struct iscsi_hdr iscsi_header;
290 char data[ISER_RECV_DATA_SEG_LEN];
291 u64 dma_addr;
292 struct ib_sge rx_sg;
293 struct ib_cqe cqe;
294 char pad[ISER_RX_PAD_SIZE];
295} __packed;
296
297/**
298 * struct iser_login_desc - iSER login descriptor
299 *
300 * @req: pointer to login request buffer
301 * @resp: pointer to login response buffer
302 * @req_dma: DMA address of login request buffer
303 * @rsp_dma: DMA address of login response buffer
304 * @sge: IB sge for login post recv
305 * @cqe: completion handler
306 */
307struct iser_login_desc {
308 void *req;
309 void *rsp;
310 u64 req_dma;
311 u64 rsp_dma;
312 struct ib_sge sge;
313 struct ib_cqe cqe;
314} __attribute__((packed));
315
316struct iser_conn;
317struct ib_conn;
318struct iscsi_iser_task;
319
320/**
321 * struct iser_comp - iSER completion context
322 *
323 * @cq: completion queue
324 * @active_qps: Number of active QPs attached
325 * to completion context
326 */
327struct iser_comp {
328 struct ib_cq *cq;
329 int active_qps;
330};
331
332/**
333 * struct iser_device - Memory registration operations
334 * per-device registration schemes
335 *
336 * @alloc_reg_res: Allocate registration resources
337 * @free_reg_res: Free registration resources
338 * @fast_reg_mem: Register memory buffers
339 * @unreg_mem: Un-register memory buffers
340 * @reg_desc_get: Get a registration descriptor for pool
341 * @reg_desc_put: Get a registration descriptor to pool
342 */
343struct iser_reg_ops {
344 int (*alloc_reg_res)(struct ib_conn *ib_conn,
345 unsigned cmds_max,
346 unsigned int size);
347 void (*free_reg_res)(struct ib_conn *ib_conn);
348 int (*reg_mem)(struct iscsi_iser_task *iser_task,
349 struct iser_data_buf *mem,
350 struct iser_reg_resources *rsc,
351 struct iser_mem_reg *reg);
352 void (*unreg_mem)(struct iscsi_iser_task *iser_task,
353 enum iser_data_dir cmd_dir);
354 struct iser_fr_desc * (*reg_desc_get)(struct ib_conn *ib_conn);
355 void (*reg_desc_put)(struct ib_conn *ib_conn,
356 struct iser_fr_desc *desc);
357};
358
359/**
360 * struct iser_device - iSER device handle
361 *
362 * @ib_device: RDMA device
363 * @pd: Protection Domain for this device
364 * @mr: Global DMA memory region
365 * @event_handler: IB events handle routine
366 * @ig_list: entry in devices list
367 * @refcount: Reference counter, dominated by open iser connections
368 * @comps_used: Number of completion contexts used, Min between online
369 * cpus and device max completion vectors
370 * @comps: Dinamically allocated array of completion handlers
371 * @reg_ops: Registration ops
372 * @remote_inv_sup: Remote invalidate is supported on this device
373 */
374struct iser_device {
375 struct ib_device *ib_device;
376 struct ib_pd *pd;
377 struct ib_event_handler event_handler;
378 struct list_head ig_list;
379 int refcount;
380 int comps_used;
381 struct iser_comp *comps;
382 const struct iser_reg_ops *reg_ops;
383 bool remote_inv_sup;
384};
385
386/**
387 * struct iser_reg_resources - Fast registration recources
388 *
389 * @mr: memory region
390 * @fmr_pool: pool of fmrs
391 * @page_vec: fast reg page list used by fmr pool
392 * @mr_valid: is mr valid indicator
393 */
394struct iser_reg_resources {
395 union {
396 struct ib_mr *mr;
397 struct ib_fmr_pool *fmr_pool;
398 };
399 struct iser_page_vec *page_vec;
400 u8 mr_valid:1;
401};
402
403/**
404 * struct iser_pi_context - Protection information context
405 *
406 * @rsc: protection buffer registration resources
407 * @sig_mr: signature enable memory region
408 * @sig_mr_valid: is sig_mr valid indicator
409 * @sig_protected: is region protected indicator
410 */
411struct iser_pi_context {
412 struct iser_reg_resources rsc;
413 struct ib_mr *sig_mr;
414 u8 sig_mr_valid:1;
415 u8 sig_protected:1;
416};
417
418/**
419 * struct iser_fr_desc - Fast registration descriptor
420 *
421 * @list: entry in connection fastreg pool
422 * @rsc: data buffer registration resources
423 * @pi_ctx: protection information context
424 */
425struct iser_fr_desc {
426 struct list_head list;
427 struct iser_reg_resources rsc;
428 struct iser_pi_context *pi_ctx;
429 struct list_head all_list;
430};
431
432/**
433 * struct iser_fr_pool: connection fast registration pool
434 *
435 * @list: list of fastreg descriptors
436 * @lock: protects fmr/fastreg pool
437 * @size: size of the pool
438 */
439struct iser_fr_pool {
440 struct list_head list;
441 spinlock_t lock;
442 int size;
443 struct list_head all_list;
444};
445
446/**
447 * struct ib_conn - Infiniband related objects
448 *
449 * @cma_id: rdma_cm connection maneger handle
450 * @qp: Connection Queue-pair
451 * @post_recv_buf_count: post receive counter
452 * @sig_count: send work request signal count
453 * @rx_wr: receive work request for batch posts
454 * @device: reference to iser device
455 * @comp: iser completion context
456 * @fr_pool: connection fast registration poool
457 * @pi_support: Indicate device T10-PI support
458 */
459struct ib_conn {
460 struct rdma_cm_id *cma_id;
461 struct ib_qp *qp;
462 int post_recv_buf_count;
463 u8 sig_count;
464 struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX];
465 struct iser_device *device;
466 struct iser_comp *comp;
467 struct iser_fr_pool fr_pool;
468 bool pi_support;
469 struct ib_cqe reg_cqe;
470};
471
472/**
473 * struct iser_conn - iSER connection context
474 *
475 * @ib_conn: connection RDMA resources
476 * @iscsi_conn: link to matching iscsi connection
477 * @ep: transport handle
478 * @state: connection logical state
479 * @qp_max_recv_dtos: maximum number of data outs, corresponds
480 * to max number of post recvs
481 * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1)
482 * @min_posted_rx: (qp_max_recv_dtos >> 2)
483 * @max_cmds: maximum cmds allowed for this connection
484 * @name: connection peer portal
485 * @release_work: deffered work for release job
486 * @state_mutex: protects iser onnection state
487 * @stop_completion: conn_stop completion
488 * @ib_completion: RDMA cleanup completion
489 * @up_completion: connection establishment completed
490 * (state is ISER_CONN_UP)
491 * @conn_list: entry in ig conn list
492 * @login_desc: login descriptor
493 * @rx_desc_head: head of rx_descs cyclic buffer
494 * @rx_descs: rx buffers array (cyclic buffer)
495 * @num_rx_descs: number of rx descriptors
496 * @scsi_sg_tablesize: scsi host sg_tablesize
497 * @pages_per_mr: maximum pages available for registration
498 */
499struct iser_conn {
500 struct ib_conn ib_conn;
501 struct iscsi_conn *iscsi_conn;
502 struct iscsi_endpoint *ep;
503 enum iser_conn_state state;
504 unsigned qp_max_recv_dtos;
505 unsigned qp_max_recv_dtos_mask;
506 unsigned min_posted_rx;
507 u16 max_cmds;
508 char name[ISER_OBJECT_NAME_SIZE];
509 struct work_struct release_work;
510 struct mutex state_mutex;
511 struct completion stop_completion;
512 struct completion ib_completion;
513 struct completion up_completion;
514 struct list_head conn_list;
515 struct iser_login_desc login_desc;
516 unsigned int rx_desc_head;
517 struct iser_rx_desc *rx_descs;
518 u32 num_rx_descs;
519 unsigned short scsi_sg_tablesize;
520 unsigned short pages_per_mr;
521 bool snd_w_inv;
522};
523
524/**
525 * struct iscsi_iser_task - iser task context
526 *
527 * @desc: TX descriptor
528 * @iser_conn: link to iser connection
529 * @status: current task status
530 * @sc: link to scsi command
531 * @command_sent: indicate if command was sent
532 * @dir: iser data direction
533 * @rdma_reg: task rdma registration desc
534 * @data: iser data buffer desc
535 * @prot: iser protection buffer desc
536 */
537struct iscsi_iser_task {
538 struct iser_tx_desc desc;
539 struct iser_conn *iser_conn;
540 enum iser_task_status status;
541 struct scsi_cmnd *sc;
542 int command_sent;
543 int dir[ISER_DIRS_NUM];
544 struct iser_mem_reg rdma_reg[ISER_DIRS_NUM];
545 struct iser_data_buf data[ISER_DIRS_NUM];
546 struct iser_data_buf prot[ISER_DIRS_NUM];
547};
548
549struct iser_page_vec {
550 u64 *pages;
551 int npages;
552 struct ib_mr fake_mr;
553};
554
555/**
556 * struct iser_global: iSER global context
557 *
558 * @device_list_mutex: protects device_list
559 * @device_list: iser devices global list
560 * @connlist_mutex: protects connlist
561 * @connlist: iser connections global list
562 * @desc_cache: kmem cache for tx dataout
563 */
564struct iser_global {
565 struct mutex device_list_mutex;
566 struct list_head device_list;
567 struct mutex connlist_mutex;
568 struct list_head connlist;
569 struct kmem_cache *desc_cache;
570};
571
572extern struct iser_global ig;
573extern int iser_debug_level;
574extern bool iser_pi_enable;
575extern int iser_pi_guard;
576extern unsigned int iser_max_sectors;
577extern bool iser_always_reg;
578
579int iser_assign_reg_ops(struct iser_device *device);
580
581int iser_send_control(struct iscsi_conn *conn,
582 struct iscsi_task *task);
583
584int iser_send_command(struct iscsi_conn *conn,
585 struct iscsi_task *task);
586
587int iser_send_data_out(struct iscsi_conn *conn,
588 struct iscsi_task *task,
589 struct iscsi_data *hdr);
590
591void iscsi_iser_recv(struct iscsi_conn *conn,
592 struct iscsi_hdr *hdr,
593 char *rx_data,
594 int rx_data_len);
595
596void iser_conn_init(struct iser_conn *iser_conn);
597
598void iser_conn_release(struct iser_conn *iser_conn);
599
600int iser_conn_terminate(struct iser_conn *iser_conn);
601
602void iser_release_work(struct work_struct *work);
603
604void iser_err_comp(struct ib_wc *wc, const char *type);
605void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc);
606void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc);
607void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc);
608void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc);
609void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc);
610void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc);
611
612void iser_task_rdma_init(struct iscsi_iser_task *task);
613
614void iser_task_rdma_finalize(struct iscsi_iser_task *task);
615
616void iser_free_rx_descriptors(struct iser_conn *iser_conn);
617
618void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
619 struct iser_data_buf *mem,
620 enum iser_data_dir cmd_dir);
621
622int iser_reg_rdma_mem(struct iscsi_iser_task *task,
623 enum iser_data_dir dir,
624 bool all_imm);
625void iser_unreg_rdma_mem(struct iscsi_iser_task *task,
626 enum iser_data_dir dir);
627
628int iser_connect(struct iser_conn *iser_conn,
629 struct sockaddr *src_addr,
630 struct sockaddr *dst_addr,
631 int non_blocking);
632
633void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
634 enum iser_data_dir cmd_dir);
635void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
636 enum iser_data_dir cmd_dir);
637
638int iser_post_recvl(struct iser_conn *iser_conn);
639int iser_post_recvm(struct iser_conn *iser_conn, int count);
640int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
641 bool signal);
642
643int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
644 struct iser_data_buf *data,
645 enum iser_data_dir iser_dir,
646 enum dma_data_direction dma_dir);
647
648void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
649 struct iser_data_buf *data,
650 enum dma_data_direction dir);
651
652int iser_initialize_task_headers(struct iscsi_task *task,
653 struct iser_tx_desc *tx_desc);
654int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
655 struct iscsi_session *session);
656int iser_alloc_fmr_pool(struct ib_conn *ib_conn,
657 unsigned cmds_max,
658 unsigned int size);
659void iser_free_fmr_pool(struct ib_conn *ib_conn);
660int iser_alloc_fastreg_pool(struct ib_conn *ib_conn,
661 unsigned cmds_max,
662 unsigned int size);
663void iser_free_fastreg_pool(struct ib_conn *ib_conn);
664u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
665 enum iser_data_dir cmd_dir, sector_t *sector);
666struct iser_fr_desc *
667iser_reg_desc_get_fr(struct ib_conn *ib_conn);
668void
669iser_reg_desc_put_fr(struct ib_conn *ib_conn,
670 struct iser_fr_desc *desc);
671struct iser_fr_desc *
672iser_reg_desc_get_fmr(struct ib_conn *ib_conn);
673void
674iser_reg_desc_put_fmr(struct ib_conn *ib_conn,
675 struct iser_fr_desc *desc);
676
677static inline struct ib_send_wr *
678iser_tx_next_wr(struct iser_tx_desc *tx_desc)
679{
680 struct ib_send_wr *cur_wr = &tx_desc->wrs[tx_desc->wr_idx].send;
681 struct ib_send_wr *last_wr;
682
683 if (tx_desc->wr_idx) {
684 last_wr = &tx_desc->wrs[tx_desc->wr_idx - 1].send;
685 last_wr->next = cur_wr;
686 }
687 tx_desc->wr_idx++;
688
689 return cur_wr;
690}
691
692static inline struct iser_conn *
693to_iser_conn(struct ib_conn *ib_conn)
694{
695 return container_of(ib_conn, struct iser_conn, ib_conn);
696}
697
698static inline struct iser_rx_desc *
699iser_rx(struct ib_cqe *cqe)
700{
701 return container_of(cqe, struct iser_rx_desc, cqe);
702}
703
704static inline struct iser_tx_desc *
705iser_tx(struct ib_cqe *cqe)
706{
707 return container_of(cqe, struct iser_tx_desc, cqe);
708}
709
710static inline struct iser_login_desc *
711iser_login(struct ib_cqe *cqe)
712{
713 return container_of(cqe, struct iser_login_desc, cqe);
714}
715
716#endif