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 "1.6" 73 74#define iser_dbg(fmt, arg...) \ 75 do { \ 76 if (unlikely(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 (unlikely(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 (unlikely(iser_debug_level > 1)) \ 91 pr_info(PFX "%s: " fmt, \ 92 __func__ , ## arg); \ 93 } while (0) 94 95#define iser_err(fmt, arg...) \ 96 pr_err(PFX "%s: " fmt, __func__ , ## arg) 97 98#define SHIFT_4K 12 99#define SIZE_4K (1ULL << SHIFT_4K) 100#define MASK_4K (~(SIZE_4K-1)) 101 /* support up to 512KB in one RDMA */ 102#define ISCSI_ISER_SG_TABLESIZE (0x80000 >> SHIFT_4K) 103#define ISER_DEF_XMIT_CMDS_DEFAULT 512 104#if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT 105 #define ISER_DEF_XMIT_CMDS_MAX ISCSI_DEF_XMIT_CMDS_MAX 106#else 107 #define ISER_DEF_XMIT_CMDS_MAX ISER_DEF_XMIT_CMDS_DEFAULT 108#endif 109#define ISER_DEF_CMD_PER_LUN ISER_DEF_XMIT_CMDS_MAX 110 111/* QP settings */ 112/* Maximal bounds on received asynchronous PDUs */ 113#define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */ 114 115#define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), * 116 * SCSI_TMFUNC(2), LOGOUT(1) */ 117 118#define ISER_QP_MAX_RECV_DTOS (ISER_DEF_XMIT_CMDS_MAX) 119 120#define ISER_MIN_POSTED_RX (ISER_DEF_XMIT_CMDS_MAX >> 2) 121 122/* the max TX (send) WR supported by the iSER QP is defined by * 123 * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect * 124 * to have at max for SCSI command. The tx posting & completion handling code * 125 * supports -EAGAIN scheme where tx is suspended till the QP has room for more * 126 * send WR. D=8 comes from 64K/8K */ 127 128#define ISER_INFLIGHT_DATAOUTS 8 129 130#define ISER_QP_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \ 131 (1 + ISER_INFLIGHT_DATAOUTS) + \ 132 ISER_MAX_TX_MISC_PDUS + \ 133 ISER_MAX_RX_MISC_PDUS) 134 135/* Max registration work requests per command */ 136#define ISER_MAX_REG_WR_PER_CMD 5 137 138/* For Signature we don't support DATAOUTs so no need to make room for them */ 139#define ISER_QP_SIG_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \ 140 (1 + ISER_MAX_REG_WR_PER_CMD) + \ 141 ISER_MAX_TX_MISC_PDUS + \ 142 ISER_MAX_RX_MISC_PDUS) 143 144#define ISER_GET_MAX_XMIT_CMDS(send_wr) ((send_wr \ 145 - ISER_MAX_TX_MISC_PDUS \ 146 - ISER_MAX_RX_MISC_PDUS) / \ 147 (1 + ISER_INFLIGHT_DATAOUTS)) 148 149#define ISER_WC_BATCH_COUNT 16 150#define ISER_SIGNAL_CMD_COUNT 32 151 152#define ISER_VER 0x10 153#define ISER_WSV 0x08 154#define ISER_RSV 0x04 155 156#define ISER_FASTREG_LI_WRID 0xffffffffffffffffULL 157#define ISER_BEACON_WRID 0xfffffffffffffffeULL 158 159/** 160 * struct iser_hdr - iSER header 161 * 162 * @flags: flags support (zbva, remote_inv) 163 * @rsvd: reserved 164 * @write_stag: write rkey 165 * @write_va: write virtual address 166 * @reaf_stag: read rkey 167 * @read_va: read virtual address 168 */ 169struct iser_hdr { 170 u8 flags; 171 u8 rsvd[3]; 172 __be32 write_stag; 173 __be64 write_va; 174 __be32 read_stag; 175 __be64 read_va; 176} __attribute__((packed)); 177 178 179#define ISER_ZBVA_NOT_SUPPORTED 0x80 180#define ISER_SEND_W_INV_NOT_SUPPORTED 0x40 181 182struct iser_cm_hdr { 183 u8 flags; 184 u8 rsvd[3]; 185} __packed; 186 187/* Constant PDU lengths calculations */ 188#define ISER_HEADERS_LEN (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr)) 189 190#define ISER_RECV_DATA_SEG_LEN 128 191#define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN) 192#define ISER_RX_LOGIN_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN) 193 194/* Length of an object name string */ 195#define ISER_OBJECT_NAME_SIZE 64 196 197enum iser_conn_state { 198 ISER_CONN_INIT, /* descriptor allocd, no conn */ 199 ISER_CONN_PENDING, /* in the process of being established */ 200 ISER_CONN_UP, /* up and running */ 201 ISER_CONN_TERMINATING, /* in the process of being terminated */ 202 ISER_CONN_DOWN, /* shut down */ 203 ISER_CONN_STATES_NUM 204}; 205 206enum iser_task_status { 207 ISER_TASK_STATUS_INIT = 0, 208 ISER_TASK_STATUS_STARTED, 209 ISER_TASK_STATUS_COMPLETED 210}; 211 212enum iser_data_dir { 213 ISER_DIR_IN = 0, /* to initiator */ 214 ISER_DIR_OUT, /* from initiator */ 215 ISER_DIRS_NUM 216}; 217 218/** 219 * struct iser_data_buf - iSER data buffer 220 * 221 * @sg: pointer to the sg list 222 * @size: num entries of this sg 223 * @data_len: total beffer byte len 224 * @dma_nents: returned by dma_map_sg 225 * @orig_sg: pointer to the original sg list (in case 226 * we used a copy) 227 * @orig_size: num entris of orig sg list 228 */ 229struct iser_data_buf { 230 struct scatterlist *sg; 231 unsigned int size; 232 unsigned long data_len; 233 unsigned int dma_nents; 234 struct scatterlist *orig_sg; 235 unsigned int orig_size; 236 }; 237 238/* fwd declarations */ 239struct iser_device; 240struct iscsi_iser_task; 241struct iscsi_endpoint; 242 243/** 244 * struct iser_mem_reg - iSER memory registration info 245 * 246 * @sge: memory region sg element 247 * @rkey: memory region remote key 248 * @mem_h: pointer to registration context (FMR/Fastreg) 249 */ 250struct iser_mem_reg { 251 struct ib_sge sge; 252 u32 rkey; 253 void *mem_h; 254}; 255 256enum iser_desc_type { 257 ISCSI_TX_CONTROL , 258 ISCSI_TX_SCSI_COMMAND, 259 ISCSI_TX_DATAOUT 260}; 261 262/** 263 * struct iser_tx_desc - iSER TX descriptor (for send wr_id) 264 * 265 * @iser_header: iser header 266 * @iscsi_header: iscsi header 267 * @type: command/control/dataout 268 * @dam_addr: header buffer dma_address 269 * @tx_sg: sg[0] points to iser/iscsi headers 270 * sg[1] optionally points to either of immediate data 271 * unsolicited data-out or control 272 * @num_sge: number sges used on this TX task 273 * @mapped: Is the task header mapped 274 */ 275struct iser_tx_desc { 276 struct iser_hdr iser_header; 277 struct iscsi_hdr iscsi_header; 278 enum iser_desc_type type; 279 u64 dma_addr; 280 struct ib_sge tx_sg[2]; 281 int num_sge; 282 bool mapped; 283}; 284 285#define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \ 286 sizeof(u64) + sizeof(struct ib_sge))) 287/** 288 * struct iser_rx_desc - iSER RX descriptor (for recv wr_id) 289 * 290 * @iser_header: iser header 291 * @iscsi_header: iscsi header 292 * @data: received data segment 293 * @dma_addr: receive buffer dma address 294 * @rx_sg: ib_sge of receive buffer 295 * @pad: for sense data TODO: Modify to maximum sense length supported 296 */ 297struct iser_rx_desc { 298 struct iser_hdr iser_header; 299 struct iscsi_hdr iscsi_header; 300 char data[ISER_RECV_DATA_SEG_LEN]; 301 u64 dma_addr; 302 struct ib_sge rx_sg; 303 char pad[ISER_RX_PAD_SIZE]; 304} __attribute__((packed)); 305 306struct iser_conn; 307struct ib_conn; 308struct iscsi_iser_task; 309 310/** 311 * struct iser_comp - iSER completion context 312 * 313 * @device: pointer to device handle 314 * @cq: completion queue 315 * @wcs: work completion array 316 * @tasklet: Tasklet handle 317 * @active_qps: Number of active QPs attached 318 * to completion context 319 */ 320struct iser_comp { 321 struct iser_device *device; 322 struct ib_cq *cq; 323 struct ib_wc wcs[ISER_WC_BATCH_COUNT]; 324 struct tasklet_struct tasklet; 325 int active_qps; 326}; 327 328/** 329 * struct iser_device - iSER device handle 330 * 331 * @ib_device: RDMA device 332 * @pd: Protection Domain for this device 333 * @dev_attr: Device attributes container 334 * @mr: Global DMA memory region 335 * @event_handler: IB events handle routine 336 * @ig_list: entry in devices list 337 * @refcount: Reference counter, dominated by open iser connections 338 * @comps_used: Number of completion contexts used, Min between online 339 * cpus and device max completion vectors 340 * @comps: Dinamically allocated array of completion handlers 341 * Memory registration pool Function pointers (FMR or Fastreg): 342 * @iser_alloc_rdma_reg_res: Allocation of memory regions pool 343 * @iser_free_rdma_reg_res: Free of memory regions pool 344 * @iser_reg_rdma_mem: Memory registration routine 345 * @iser_unreg_rdma_mem: Memory deregistration routine 346 */ 347struct iser_device { 348 struct ib_device *ib_device; 349 struct ib_pd *pd; 350 struct ib_device_attr dev_attr; 351 struct ib_mr *mr; 352 struct ib_event_handler event_handler; 353 struct list_head ig_list; 354 int refcount; 355 int comps_used; 356 struct iser_comp *comps; 357 int (*iser_alloc_rdma_reg_res)(struct ib_conn *ib_conn, 358 unsigned cmds_max); 359 void (*iser_free_rdma_reg_res)(struct ib_conn *ib_conn); 360 int (*iser_reg_rdma_mem)(struct iscsi_iser_task *iser_task, 361 enum iser_data_dir cmd_dir); 362 void (*iser_unreg_rdma_mem)(struct iscsi_iser_task *iser_task, 363 enum iser_data_dir cmd_dir); 364}; 365 366#define ISER_CHECK_GUARD 0xc0 367#define ISER_CHECK_REFTAG 0x0f 368#define ISER_CHECK_APPTAG 0x30 369 370enum iser_reg_indicator { 371 ISER_DATA_KEY_VALID = 1 << 0, 372 ISER_PROT_KEY_VALID = 1 << 1, 373 ISER_SIG_KEY_VALID = 1 << 2, 374 ISER_FASTREG_PROTECTED = 1 << 3, 375}; 376 377/** 378 * struct iser_pi_context - Protection information context 379 * 380 * @prot_mr: protection memory region 381 * @prot_frpl: protection fastreg page list 382 * @sig_mr: signature feature enabled memory region 383 */ 384struct iser_pi_context { 385 struct ib_mr *prot_mr; 386 struct ib_fast_reg_page_list *prot_frpl; 387 struct ib_mr *sig_mr; 388}; 389 390/** 391 * struct fast_reg_descriptor - Fast registration descriptor 392 * 393 * @list: entry in connection fastreg pool 394 * @data_mr: data memory region 395 * @data_frpl: data fastreg page list 396 * @pi_ctx: protection information context 397 * @reg_indicators: fast registration indicators 398 */ 399struct fast_reg_descriptor { 400 struct list_head list; 401 struct ib_mr *data_mr; 402 struct ib_fast_reg_page_list *data_frpl; 403 struct iser_pi_context *pi_ctx; 404 u8 reg_indicators; 405}; 406 407/** 408 * struct ib_conn - Infiniband related objects 409 * 410 * @cma_id: rdma_cm connection maneger handle 411 * @qp: Connection Queue-pair 412 * @post_recv_buf_count: post receive counter 413 * @sig_count: send work request signal count 414 * @rx_wr: receive work request for batch posts 415 * @device: reference to iser device 416 * @comp: iser completion context 417 * @pi_support: Indicate device T10-PI support 418 * @beacon: beacon send wr to signal all flush errors were drained 419 * @flush_comp: completes when all connection completions consumed 420 * @lock: protects fmr/fastreg pool 421 * @union.fmr: 422 * @pool: FMR pool for fast registrations 423 * @page_vec: page vector to hold mapped commands pages 424 * used for registration 425 * @union.fastreg: 426 * @pool: Fast registration descriptors pool for fast 427 * registrations 428 * @pool_size: Size of pool 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 bool pi_support; 439 struct ib_send_wr beacon; 440 struct completion flush_comp; 441 spinlock_t lock; 442 union { 443 struct { 444 struct ib_fmr_pool *pool; 445 struct iser_page_vec *page_vec; 446 } fmr; 447 struct { 448 struct list_head pool; 449 int pool_size; 450 } fastreg; 451 }; 452}; 453 454/** 455 * struct iser_conn - iSER connection context 456 * 457 * @ib_conn: connection RDMA resources 458 * @iscsi_conn: link to matching iscsi connection 459 * @ep: transport handle 460 * @state: connection logical state 461 * @qp_max_recv_dtos: maximum number of data outs, corresponds 462 * to max number of post recvs 463 * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1) 464 * @min_posted_rx: (qp_max_recv_dtos >> 2) 465 * @max_cmds: maximum cmds allowed for this connection 466 * @name: connection peer portal 467 * @release_work: deffered work for release job 468 * @state_mutex: protects iser onnection state 469 * @stop_completion: conn_stop completion 470 * @ib_completion: RDMA cleanup completion 471 * @up_completion: connection establishment completed 472 * (state is ISER_CONN_UP) 473 * @conn_list: entry in ig conn list 474 * @login_buf: login data buffer (stores login parameters) 475 * @login_req_buf: login request buffer 476 * @login_req_dma: login request buffer dma address 477 * @login_resp_buf: login response buffer 478 * @login_resp_dma: login response buffer dma address 479 * @rx_desc_head: head of rx_descs cyclic buffer 480 * @rx_descs: rx buffers array (cyclic buffer) 481 * @num_rx_descs: number of rx descriptors 482 */ 483struct iser_conn { 484 struct ib_conn ib_conn; 485 struct iscsi_conn *iscsi_conn; 486 struct iscsi_endpoint *ep; 487 enum iser_conn_state state; 488 unsigned qp_max_recv_dtos; 489 unsigned qp_max_recv_dtos_mask; 490 unsigned min_posted_rx; 491 u16 max_cmds; 492 char name[ISER_OBJECT_NAME_SIZE]; 493 struct work_struct release_work; 494 struct mutex state_mutex; 495 struct completion stop_completion; 496 struct completion ib_completion; 497 struct completion up_completion; 498 struct list_head conn_list; 499 500 char *login_buf; 501 char *login_req_buf, *login_resp_buf; 502 u64 login_req_dma, login_resp_dma; 503 unsigned int rx_desc_head; 504 struct iser_rx_desc *rx_descs; 505 u32 num_rx_descs; 506}; 507 508/** 509 * struct iscsi_iser_task - iser task context 510 * 511 * @desc: TX descriptor 512 * @iser_conn: link to iser connection 513 * @status: current task status 514 * @sc: link to scsi command 515 * @command_sent: indicate if command was sent 516 * @dir: iser data direction 517 * @rdma_reg: task rdma registration desc 518 * @data: iser data buffer desc 519 * @prot: iser protection buffer desc 520 */ 521struct iscsi_iser_task { 522 struct iser_tx_desc desc; 523 struct iser_conn *iser_conn; 524 enum iser_task_status status; 525 struct scsi_cmnd *sc; 526 int command_sent; 527 int dir[ISER_DIRS_NUM]; 528 struct iser_mem_reg rdma_reg[ISER_DIRS_NUM]; 529 struct iser_data_buf data[ISER_DIRS_NUM]; 530 struct iser_data_buf prot[ISER_DIRS_NUM]; 531}; 532 533struct iser_page_vec { 534 u64 *pages; 535 int length; 536 int offset; 537 int data_size; 538}; 539 540/** 541 * struct iser_global: iSER global context 542 * 543 * @device_list_mutex: protects device_list 544 * @device_list: iser devices global list 545 * @connlist_mutex: protects connlist 546 * @connlist: iser connections global list 547 * @desc_cache: kmem cache for tx dataout 548 */ 549struct iser_global { 550 struct mutex device_list_mutex; 551 struct list_head device_list; 552 struct mutex connlist_mutex; 553 struct list_head connlist; 554 struct kmem_cache *desc_cache; 555}; 556 557extern struct iser_global ig; 558extern int iser_debug_level; 559extern bool iser_pi_enable; 560extern int iser_pi_guard; 561 562int iser_send_control(struct iscsi_conn *conn, 563 struct iscsi_task *task); 564 565int iser_send_command(struct iscsi_conn *conn, 566 struct iscsi_task *task); 567 568int iser_send_data_out(struct iscsi_conn *conn, 569 struct iscsi_task *task, 570 struct iscsi_data *hdr); 571 572void iscsi_iser_recv(struct iscsi_conn *conn, 573 struct iscsi_hdr *hdr, 574 char *rx_data, 575 int rx_data_len); 576 577void iser_conn_init(struct iser_conn *iser_conn); 578 579void iser_conn_release(struct iser_conn *iser_conn); 580 581int iser_conn_terminate(struct iser_conn *iser_conn); 582 583void iser_release_work(struct work_struct *work); 584 585void iser_rcv_completion(struct iser_rx_desc *desc, 586 unsigned long dto_xfer_len, 587 struct ib_conn *ib_conn); 588 589void iser_snd_completion(struct iser_tx_desc *desc, 590 struct ib_conn *ib_conn); 591 592void iser_task_rdma_init(struct iscsi_iser_task *task); 593 594void iser_task_rdma_finalize(struct iscsi_iser_task *task); 595 596void iser_free_rx_descriptors(struct iser_conn *iser_conn); 597 598void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task, 599 struct iser_data_buf *mem, 600 enum iser_data_dir cmd_dir); 601 602int iser_reg_rdma_mem_fmr(struct iscsi_iser_task *task, 603 enum iser_data_dir cmd_dir); 604int iser_reg_rdma_mem_fastreg(struct iscsi_iser_task *task, 605 enum iser_data_dir cmd_dir); 606 607int iser_connect(struct iser_conn *iser_conn, 608 struct sockaddr *src_addr, 609 struct sockaddr *dst_addr, 610 int non_blocking); 611 612void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task, 613 enum iser_data_dir cmd_dir); 614void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task, 615 enum iser_data_dir cmd_dir); 616 617int iser_post_recvl(struct iser_conn *iser_conn); 618int iser_post_recvm(struct iser_conn *iser_conn, int count); 619int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc, 620 bool signal); 621 622int iser_dma_map_task_data(struct iscsi_iser_task *iser_task, 623 struct iser_data_buf *data, 624 enum iser_data_dir iser_dir, 625 enum dma_data_direction dma_dir); 626 627void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task, 628 struct iser_data_buf *data, 629 enum dma_data_direction dir); 630 631int iser_initialize_task_headers(struct iscsi_task *task, 632 struct iser_tx_desc *tx_desc); 633int iser_alloc_rx_descriptors(struct iser_conn *iser_conn, 634 struct iscsi_session *session); 635int iser_create_fmr_pool(struct ib_conn *ib_conn, unsigned cmds_max); 636void iser_free_fmr_pool(struct ib_conn *ib_conn); 637int iser_create_fastreg_pool(struct ib_conn *ib_conn, unsigned cmds_max); 638void iser_free_fastreg_pool(struct ib_conn *ib_conn); 639u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task, 640 enum iser_data_dir cmd_dir, sector_t *sector); 641struct fast_reg_descriptor * 642iser_reg_desc_get(struct ib_conn *ib_conn); 643void 644iser_reg_desc_put(struct ib_conn *ib_conn, 645 struct fast_reg_descriptor *desc); 646#endif 647