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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
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>
61
62#include <linux/socket.h>
63#include <linux/in.h>
64#include <linux/in6.h>
65
66#include <rdma/ib_verbs.h>
67#include <rdma/ib_fmr_pool.h>
68#include <rdma/rdma_cm.h>
69
70#define DRV_NAME "iser"
71#define PFX DRV_NAME ": "
72#define DRV_VER "1.4.8"
73
74#define iser_dbg(fmt, arg...) \
75 do { \
76 if (iser_debug_level > 2) \
77 printk(KERN_DEBUG PFX "%s: " fmt,\
78 __func__ , ## arg); \
79 } while (0)
80
81#define iser_warn(fmt, arg...) \
82 do { \
83 if (iser_debug_level > 0) \
84 pr_warn(PFX "%s: " fmt, \
85 __func__ , ## arg); \
86 } while (0)
87
88#define iser_info(fmt, arg...) \
89 do { \
90 if (iser_debug_level > 1) \
91 pr_info(PFX "%s: " fmt, \
92 __func__ , ## arg); \
93 } while (0)
94
95#define iser_err(fmt, arg...) \
96 do { \
97 printk(KERN_ERR PFX "%s: " fmt, \
98 __func__ , ## arg); \
99 } while (0)
100
101#define SHIFT_4K 12
102#define SIZE_4K (1ULL << SHIFT_4K)
103#define MASK_4K (~(SIZE_4K-1))
104 /* support up to 512KB in one RDMA */
105#define ISCSI_ISER_SG_TABLESIZE (0x80000 >> SHIFT_4K)
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_WC_BATCH_COUNT 16
148#define ISER_SIGNAL_CMD_COUNT 32
149
150#define ISER_VER 0x10
151#define ISER_WSV 0x08
152#define ISER_RSV 0x04
153
154#define ISER_FASTREG_LI_WRID 0xffffffffffffffffULL
155#define ISER_BEACON_WRID 0xfffffffffffffffeULL
156
157/**
158 * struct iser_hdr - iSER header
159 *
160 * @flags: flags support (zbva, remote_inv)
161 * @rsvd: reserved
162 * @write_stag: write rkey
163 * @write_va: write virtual address
164 * @reaf_stag: read rkey
165 * @read_va: read virtual address
166 */
167struct iser_hdr {
168 u8 flags;
169 u8 rsvd[3];
170 __be32 write_stag;
171 __be64 write_va;
172 __be32 read_stag;
173 __be64 read_va;
174} __attribute__((packed));
175
176
177#define ISER_ZBVA_NOT_SUPPORTED 0x80
178#define ISER_SEND_W_INV_NOT_SUPPORTED 0x40
179
180struct iser_cm_hdr {
181 u8 flags;
182 u8 rsvd[3];
183} __packed;
184
185/* Constant PDU lengths calculations */
186#define ISER_HEADERS_LEN (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr))
187
188#define ISER_RECV_DATA_SEG_LEN 128
189#define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
190#define ISER_RX_LOGIN_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
191
192/* Length of an object name string */
193#define ISER_OBJECT_NAME_SIZE 64
194
195enum iser_conn_state {
196 ISER_CONN_INIT, /* descriptor allocd, no conn */
197 ISER_CONN_PENDING, /* in the process of being established */
198 ISER_CONN_UP, /* up and running */
199 ISER_CONN_TERMINATING, /* in the process of being terminated */
200 ISER_CONN_DOWN, /* shut down */
201 ISER_CONN_STATES_NUM
202};
203
204enum iser_task_status {
205 ISER_TASK_STATUS_INIT = 0,
206 ISER_TASK_STATUS_STARTED,
207 ISER_TASK_STATUS_COMPLETED
208};
209
210enum iser_data_dir {
211 ISER_DIR_IN = 0, /* to initiator */
212 ISER_DIR_OUT, /* from initiator */
213 ISER_DIRS_NUM
214};
215
216/**
217 * struct iser_data_buf - iSER data buffer
218 *
219 * @buf: pointer to the sg list
220 * @size: num entries of this sg
221 * @data_len: total beffer byte len
222 * @dma_nents: returned by dma_map_sg
223 * @copy_buf: allocated copy buf for SGs unaligned
224 * for rdma which are copied
225 * @sg_single: SG-ified clone of a non SG SC or
226 * unaligned SG
227 */
228struct iser_data_buf {
229 void *buf;
230 unsigned int size;
231 unsigned long data_len;
232 unsigned int dma_nents;
233 char *copy_buf;
234 struct scatterlist sg_single;
235 };
236
237/* fwd declarations */
238struct iser_device;
239struct iscsi_iser_task;
240struct iscsi_endpoint;
241
242/**
243 * struct iser_mem_reg - iSER memory registration info
244 *
245 * @lkey: MR local key
246 * @rkey: MR remote key
247 * @va: MR start address (buffer va)
248 * @len: MR length
249 * @mem_h: pointer to registration context (FMR/Fastreg)
250 * @is_mr: indicates weather we registered the buffer
251 */
252struct iser_mem_reg {
253 u32 lkey;
254 u32 rkey;
255 u64 va;
256 u64 len;
257 void *mem_h;
258 int is_mr;
259};
260
261/**
262 * struct iser_regd_buf - iSER buffer registration desc
263 *
264 * @reg: memory registration info
265 * @virt_addr: virtual address of buffer
266 * @device: reference to iser device
267 * @direction: dma direction (for dma_unmap)
268 * @data_size: data buffer size in bytes
269 */
270struct iser_regd_buf {
271 struct iser_mem_reg reg;
272 void *virt_addr;
273 struct iser_device *device;
274 enum dma_data_direction direction;
275 unsigned int data_size;
276};
277
278enum iser_desc_type {
279 ISCSI_TX_CONTROL ,
280 ISCSI_TX_SCSI_COMMAND,
281 ISCSI_TX_DATAOUT
282};
283
284/**
285 * struct iser_tx_desc - iSER TX descriptor (for send wr_id)
286 *
287 * @iser_header: iser header
288 * @iscsi_header: iscsi header
289 * @type: command/control/dataout
290 * @dam_addr: header buffer dma_address
291 * @tx_sg: sg[0] points to iser/iscsi headers
292 * sg[1] optionally points to either of immediate data
293 * unsolicited data-out or control
294 * @num_sge: number sges used on this TX task
295 */
296struct iser_tx_desc {
297 struct iser_hdr iser_header;
298 struct iscsi_hdr iscsi_header;
299 enum iser_desc_type type;
300 u64 dma_addr;
301 struct ib_sge tx_sg[2];
302 int num_sge;
303};
304
305#define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \
306 sizeof(u64) + sizeof(struct ib_sge)))
307/**
308 * struct iser_rx_desc - iSER RX descriptor (for recv wr_id)
309 *
310 * @iser_header: iser header
311 * @iscsi_header: iscsi header
312 * @data: received data segment
313 * @dma_addr: receive buffer dma address
314 * @rx_sg: ib_sge of receive buffer
315 * @pad: for sense data TODO: Modify to maximum sense length supported
316 */
317struct iser_rx_desc {
318 struct iser_hdr iser_header;
319 struct iscsi_hdr iscsi_header;
320 char data[ISER_RECV_DATA_SEG_LEN];
321 u64 dma_addr;
322 struct ib_sge rx_sg;
323 char pad[ISER_RX_PAD_SIZE];
324} __attribute__((packed));
325
326#define ISER_MAX_CQ 4
327
328struct iser_conn;
329struct ib_conn;
330struct iscsi_iser_task;
331
332/**
333 * struct iser_comp - iSER completion context
334 *
335 * @device: pointer to device handle
336 * @cq: completion queue
337 * @wcs: work completion array
338 * @tasklet: Tasklet handle
339 * @active_qps: Number of active QPs attached
340 * to completion context
341 */
342struct iser_comp {
343 struct iser_device *device;
344 struct ib_cq *cq;
345 struct ib_wc wcs[ISER_WC_BATCH_COUNT];
346 struct tasklet_struct tasklet;
347 int active_qps;
348};
349
350/**
351 * struct iser_device - iSER device handle
352 *
353 * @ib_device: RDMA device
354 * @pd: Protection Domain for this device
355 * @dev_attr: Device attributes container
356 * @mr: Global DMA memory region
357 * @event_handler: IB events handle routine
358 * @ig_list: entry in devices list
359 * @refcount: Reference counter, dominated by open iser connections
360 * @comps_used: Number of completion contexts used, Min between online
361 * cpus and device max completion vectors
362 * @comps: Dinamically allocated array of completion handlers
363 * Memory registration pool Function pointers (FMR or Fastreg):
364 * @iser_alloc_rdma_reg_res: Allocation of memory regions pool
365 * @iser_free_rdma_reg_res: Free of memory regions pool
366 * @iser_reg_rdma_mem: Memory registration routine
367 * @iser_unreg_rdma_mem: Memory deregistration routine
368 */
369struct iser_device {
370 struct ib_device *ib_device;
371 struct ib_pd *pd;
372 struct ib_device_attr dev_attr;
373 struct ib_mr *mr;
374 struct ib_event_handler event_handler;
375 struct list_head ig_list;
376 int refcount;
377 int comps_used;
378 struct iser_comp comps[ISER_MAX_CQ];
379 int (*iser_alloc_rdma_reg_res)(struct ib_conn *ib_conn,
380 unsigned cmds_max);
381 void (*iser_free_rdma_reg_res)(struct ib_conn *ib_conn);
382 int (*iser_reg_rdma_mem)(struct iscsi_iser_task *iser_task,
383 enum iser_data_dir cmd_dir);
384 void (*iser_unreg_rdma_mem)(struct iscsi_iser_task *iser_task,
385 enum iser_data_dir cmd_dir);
386};
387
388#define ISER_CHECK_GUARD 0xc0
389#define ISER_CHECK_REFTAG 0x0f
390#define ISER_CHECK_APPTAG 0x30
391
392enum iser_reg_indicator {
393 ISER_DATA_KEY_VALID = 1 << 0,
394 ISER_PROT_KEY_VALID = 1 << 1,
395 ISER_SIG_KEY_VALID = 1 << 2,
396 ISER_FASTREG_PROTECTED = 1 << 3,
397};
398
399/**
400 * struct iser_pi_context - Protection information context
401 *
402 * @prot_mr: protection memory region
403 * @prot_frpl: protection fastreg page list
404 * @sig_mr: signature feature enabled memory region
405 */
406struct iser_pi_context {
407 struct ib_mr *prot_mr;
408 struct ib_fast_reg_page_list *prot_frpl;
409 struct ib_mr *sig_mr;
410};
411
412/**
413 * struct fast_reg_descriptor - Fast registration descriptor
414 *
415 * @list: entry in connection fastreg pool
416 * @data_mr: data memory region
417 * @data_frpl: data fastreg page list
418 * @pi_ctx: protection information context
419 * @reg_indicators: fast registration indicators
420 */
421struct fast_reg_descriptor {
422 struct list_head list;
423 struct ib_mr *data_mr;
424 struct ib_fast_reg_page_list *data_frpl;
425 struct iser_pi_context *pi_ctx;
426 u8 reg_indicators;
427};
428
429/**
430 * struct ib_conn - Infiniband related objects
431 *
432 * @cma_id: rdma_cm connection maneger handle
433 * @qp: Connection Queue-pair
434 * @post_recv_buf_count: post receive counter
435 * @rx_wr: receive work request for batch posts
436 * @device: reference to iser device
437 * @comp: iser completion context
438 * @pi_support: Indicate device T10-PI support
439 * @beacon: beacon send wr to signal all flush errors were drained
440 * @flush_comp: completes when all connection completions consumed
441 * @lock: protects fmr/fastreg pool
442 * @union.fmr:
443 * @pool: FMR pool for fast registrations
444 * @page_vec: page vector to hold mapped commands pages
445 * used for registration
446 * @union.fastreg:
447 * @pool: Fast registration descriptors pool for fast
448 * registrations
449 * @pool_size: Size of pool
450 */
451struct ib_conn {
452 struct rdma_cm_id *cma_id;
453 struct ib_qp *qp;
454 int post_recv_buf_count;
455 struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX];
456 struct iser_device *device;
457 struct iser_comp *comp;
458 bool pi_support;
459 struct ib_send_wr beacon;
460 struct completion flush_comp;
461 spinlock_t lock;
462 union {
463 struct {
464 struct ib_fmr_pool *pool;
465 struct iser_page_vec *page_vec;
466 } fmr;
467 struct {
468 struct list_head pool;
469 int pool_size;
470 } fastreg;
471 };
472};
473
474/**
475 * struct iser_conn - iSER connection context
476 *
477 * @ib_conn: connection RDMA resources
478 * @iscsi_conn: link to matching iscsi connection
479 * @ep: transport handle
480 * @state: connection logical state
481 * @qp_max_recv_dtos: maximum number of data outs, corresponds
482 * to max number of post recvs
483 * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1)
484 * @min_posted_rx: (qp_max_recv_dtos >> 2)
485 * @name: connection peer portal
486 * @release_work: deffered work for release job
487 * @state_mutex: protects iser onnection state
488 * @stop_completion: conn_stop completion
489 * @ib_completion: RDMA cleanup completion
490 * @up_completion: connection establishment completed
491 * (state is ISER_CONN_UP)
492 * @conn_list: entry in ig conn list
493 * @login_buf: login data buffer (stores login parameters)
494 * @login_req_buf: login request buffer
495 * @login_req_dma: login request buffer dma address
496 * @login_resp_buf: login response buffer
497 * @login_resp_dma: login response buffer dma address
498 * @rx_desc_head: head of rx_descs cyclic buffer
499 * @rx_descs: rx buffers array (cyclic buffer)
500 * @num_rx_descs: number of rx descriptors
501 */
502struct iser_conn {
503 struct ib_conn ib_conn;
504 struct iscsi_conn *iscsi_conn;
505 struct iscsi_endpoint *ep;
506 enum iser_conn_state state;
507 unsigned qp_max_recv_dtos;
508 unsigned qp_max_recv_dtos_mask;
509 unsigned min_posted_rx;
510 char name[ISER_OBJECT_NAME_SIZE];
511 struct work_struct release_work;
512 struct mutex state_mutex;
513 struct completion stop_completion;
514 struct completion ib_completion;
515 struct completion up_completion;
516 struct list_head conn_list;
517
518 char *login_buf;
519 char *login_req_buf, *login_resp_buf;
520 u64 login_req_dma, login_resp_dma;
521 unsigned int rx_desc_head;
522 struct iser_rx_desc *rx_descs;
523 u32 num_rx_descs;
524};
525
526/**
527 * struct iscsi_iser_task - iser task context
528 *
529 * @desc: TX descriptor
530 * @iser_conn: link to iser connection
531 * @status: current task status
532 * @sc: link to scsi command
533 * @command_sent: indicate if command was sent
534 * @dir: iser data direction
535 * @rdma_regd: task rdma registration desc
536 * @data: iser data buffer desc
537 * @data_copy: iser data copy buffer desc (bounce buffer)
538 * @prot: iser protection buffer desc
539 * @prot_copy: iser protection copy buffer desc (bounce buffer)
540 */
541struct iscsi_iser_task {
542 struct iser_tx_desc desc;
543 struct iser_conn *iser_conn;
544 enum iser_task_status status;
545 struct scsi_cmnd *sc;
546 int command_sent;
547 int dir[ISER_DIRS_NUM];
548 struct iser_regd_buf rdma_regd[ISER_DIRS_NUM];
549 struct iser_data_buf data[ISER_DIRS_NUM];
550 struct iser_data_buf data_copy[ISER_DIRS_NUM];
551 struct iser_data_buf prot[ISER_DIRS_NUM];
552 struct iser_data_buf prot_copy[ISER_DIRS_NUM];
553};
554
555struct iser_page_vec {
556 u64 *pages;
557 int length;
558 int offset;
559 int data_size;
560};
561
562/**
563 * struct iser_global: iSER global context
564 *
565 * @device_list_mutex: protects device_list
566 * @device_list: iser devices global list
567 * @connlist_mutex: protects connlist
568 * @connlist: iser connections global list
569 * @desc_cache: kmem cache for tx dataout
570 */
571struct iser_global {
572 struct mutex device_list_mutex;
573 struct list_head device_list;
574 struct mutex connlist_mutex;
575 struct list_head connlist;
576 struct kmem_cache *desc_cache;
577};
578
579extern struct iser_global ig;
580extern int iser_debug_level;
581extern bool iser_pi_enable;
582extern int iser_pi_guard;
583
584int iser_send_control(struct iscsi_conn *conn,
585 struct iscsi_task *task);
586
587int iser_send_command(struct iscsi_conn *conn,
588 struct iscsi_task *task);
589
590int iser_send_data_out(struct iscsi_conn *conn,
591 struct iscsi_task *task,
592 struct iscsi_data *hdr);
593
594void iscsi_iser_recv(struct iscsi_conn *conn,
595 struct iscsi_hdr *hdr,
596 char *rx_data,
597 int rx_data_len);
598
599void iser_conn_init(struct iser_conn *iser_conn);
600
601void iser_conn_release(struct iser_conn *iser_conn);
602
603int iser_conn_terminate(struct iser_conn *iser_conn);
604
605void iser_release_work(struct work_struct *work);
606
607void iser_rcv_completion(struct iser_rx_desc *desc,
608 unsigned long dto_xfer_len,
609 struct ib_conn *ib_conn);
610
611void iser_snd_completion(struct iser_tx_desc *desc,
612 struct ib_conn *ib_conn);
613
614void iser_task_rdma_init(struct iscsi_iser_task *task);
615
616void iser_task_rdma_finalize(struct iscsi_iser_task *task);
617
618void iser_free_rx_descriptors(struct iser_conn *iser_conn);
619
620void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
621 struct iser_data_buf *mem,
622 struct iser_data_buf *mem_copy,
623 enum iser_data_dir cmd_dir);
624
625int iser_reg_rdma_mem_fmr(struct iscsi_iser_task *task,
626 enum iser_data_dir cmd_dir);
627int iser_reg_rdma_mem_fastreg(struct iscsi_iser_task *task,
628 enum iser_data_dir cmd_dir);
629
630int iser_connect(struct iser_conn *iser_conn,
631 struct sockaddr *src_addr,
632 struct sockaddr *dst_addr,
633 int non_blocking);
634
635int iser_reg_page_vec(struct ib_conn *ib_conn,
636 struct iser_page_vec *page_vec,
637 struct iser_mem_reg *mem_reg);
638
639void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
640 enum iser_data_dir cmd_dir);
641void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
642 enum iser_data_dir cmd_dir);
643
644int iser_post_recvl(struct iser_conn *iser_conn);
645int iser_post_recvm(struct iser_conn *iser_conn, int count);
646int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
647 bool signal);
648
649int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
650 struct iser_data_buf *data,
651 enum iser_data_dir iser_dir,
652 enum dma_data_direction dma_dir);
653
654void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
655 struct iser_data_buf *data);
656int iser_initialize_task_headers(struct iscsi_task *task,
657 struct iser_tx_desc *tx_desc);
658int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
659 struct iscsi_session *session);
660int iser_create_fmr_pool(struct ib_conn *ib_conn, unsigned cmds_max);
661void iser_free_fmr_pool(struct ib_conn *ib_conn);
662int iser_create_fastreg_pool(struct ib_conn *ib_conn, unsigned cmds_max);
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);
666#endif