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 */ 169 struct 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 181 182 struct 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 64 196 197 enum 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 }; 205 206 enum iser_task_status { 207 ISER_TASK_STATUS_INIT = 0, 208 ISER_TASK_STATUS_STARTED, 209 ISER_TASK_STATUS_COMPLETED 210 }; 211 212 enum 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 */ 229 struct 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 */ 239 struct iser_device; 240 struct iscsi_iser_task; 241 struct 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 */ 250 struct iser_mem_reg { 251 struct ib_sge sge; 252 u32 rkey; 253 void *mem_h; 254 }; 255 256 enum 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 */ 275 struct 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 */ 297 struct 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)); 305 306 struct iser_conn; 307 struct ib_conn; 308 struct 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 */ 320 struct 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 - Memory registration operations 330 * per-device registration schemes 331 * 332 * @alloc_reg_res: Allocate registration resources 333 * @free_reg_res: Free registration resources 334 * @reg_rdma_mem: Register memory buffers 335 * @unreg_rdma_mem: Un-register memory buffers 336 */ 337 struct iser_reg_ops { 338 int (*alloc_reg_res)(struct ib_conn *ib_conn, 339 unsigned cmds_max); 340 void (*free_reg_res)(struct ib_conn *ib_conn); 341 int (*reg_rdma_mem)(struct iscsi_iser_task *iser_task, 342 enum iser_data_dir cmd_dir); 343 void (*unreg_rdma_mem)(struct iscsi_iser_task *iser_task, 344 enum iser_data_dir cmd_dir); 345 }; 346 347 /** 348 * struct iser_device - iSER device handle 349 * 350 * @ib_device: RDMA device 351 * @pd: Protection Domain for this device 352 * @dev_attr: Device attributes container 353 * @mr: Global DMA memory region 354 * @event_handler: IB events handle routine 355 * @ig_list: entry in devices list 356 * @refcount: Reference counter, dominated by open iser connections 357 * @comps_used: Number of completion contexts used, Min between online 358 * cpus and device max completion vectors 359 * @comps: Dinamically allocated array of completion handlers 360 * @reg_ops: Registration ops 361 */ 362 struct iser_device { 363 struct ib_device *ib_device; 364 struct ib_pd *pd; 365 struct ib_device_attr dev_attr; 366 struct ib_mr *mr; 367 struct ib_event_handler event_handler; 368 struct list_head ig_list; 369 int refcount; 370 int comps_used; 371 struct iser_comp *comps; 372 struct iser_reg_ops *reg_ops; 373 }; 374 375 #define ISER_CHECK_GUARD 0xc0 376 #define ISER_CHECK_REFTAG 0x0f 377 #define ISER_CHECK_APPTAG 0x30 378 379 /** 380 * struct iser_reg_resources - Fast registration recources 381 * 382 * @mr: memory region 383 * @fmr_pool: pool of fmrs 384 * @frpl: fast reg page list used by frwrs 385 * @page_vec: fast reg page list used by fmr pool 386 * @mr_valid: is mr valid indicator 387 */ 388 struct iser_reg_resources { 389 union { 390 struct ib_mr *mr; 391 struct ib_fmr_pool *fmr_pool; 392 }; 393 union { 394 struct ib_fast_reg_page_list *frpl; 395 struct iser_page_vec *page_vec; 396 }; 397 u8 mr_valid:1; 398 }; 399 400 /** 401 * struct iser_pi_context - Protection information context 402 * 403 * @rsc: protection buffer registration resources 404 * @sig_mr: signature enable memory region 405 * @sig_mr_valid: is sig_mr valid indicator 406 * @sig_protected: is region protected indicator 407 */ 408 struct iser_pi_context { 409 struct iser_reg_resources rsc; 410 struct ib_mr *sig_mr; 411 u8 sig_mr_valid:1; 412 u8 sig_protected:1; 413 }; 414 415 /** 416 * struct iser_fr_desc - Fast registration descriptor 417 * 418 * @list: entry in connection fastreg pool 419 * @rsc: data buffer registration resources 420 * @pi_ctx: protection information context 421 */ 422 struct iser_fr_desc { 423 struct list_head list; 424 struct iser_reg_resources rsc; 425 struct iser_pi_context *pi_ctx; 426 }; 427 428 /** 429 * struct iser_fr_pool: connection fast registration pool 430 * 431 * @list: list of fastreg descriptors 432 * @lock: protects fmr/fastreg pool 433 * @size: size of the pool 434 */ 435 struct iser_fr_pool { 436 struct list_head list; 437 spinlock_t lock; 438 int size; 439 }; 440 441 /** 442 * struct ib_conn - Infiniband related objects 443 * 444 * @cma_id: rdma_cm connection maneger handle 445 * @qp: Connection Queue-pair 446 * @post_recv_buf_count: post receive counter 447 * @sig_count: send work request signal count 448 * @rx_wr: receive work request for batch posts 449 * @device: reference to iser device 450 * @comp: iser completion context 451 * @pi_support: Indicate device T10-PI support 452 * @beacon: beacon send wr to signal all flush errors were drained 453 * @flush_comp: completes when all connection completions consumed 454 * @fr_pool: connection fast registration poool 455 */ 456 struct ib_conn { 457 struct rdma_cm_id *cma_id; 458 struct ib_qp *qp; 459 int post_recv_buf_count; 460 u8 sig_count; 461 struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX]; 462 struct iser_device *device; 463 struct iser_comp *comp; 464 bool pi_support; 465 struct ib_send_wr beacon; 466 struct completion flush_comp; 467 struct iser_fr_pool fr_pool; 468 }; 469 470 /** 471 * struct iser_conn - iSER connection context 472 * 473 * @ib_conn: connection RDMA resources 474 * @iscsi_conn: link to matching iscsi connection 475 * @ep: transport handle 476 * @state: connection logical state 477 * @qp_max_recv_dtos: maximum number of data outs, corresponds 478 * to max number of post recvs 479 * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1) 480 * @min_posted_rx: (qp_max_recv_dtos >> 2) 481 * @max_cmds: maximum cmds allowed for this connection 482 * @name: connection peer portal 483 * @release_work: deffered work for release job 484 * @state_mutex: protects iser onnection state 485 * @stop_completion: conn_stop completion 486 * @ib_completion: RDMA cleanup completion 487 * @up_completion: connection establishment completed 488 * (state is ISER_CONN_UP) 489 * @conn_list: entry in ig conn list 490 * @login_buf: login data buffer (stores login parameters) 491 * @login_req_buf: login request buffer 492 * @login_req_dma: login request buffer dma address 493 * @login_resp_buf: login response buffer 494 * @login_resp_dma: login response buffer dma address 495 * @rx_desc_head: head of rx_descs cyclic buffer 496 * @rx_descs: rx buffers array (cyclic buffer) 497 * @num_rx_descs: number of rx descriptors 498 */ 499 struct 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; 515 516 char *login_buf; 517 char *login_req_buf, *login_resp_buf; 518 u64 login_req_dma, login_resp_dma; 519 unsigned int rx_desc_head; 520 struct iser_rx_desc *rx_descs; 521 u32 num_rx_descs; 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 */ 537 struct 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 }; 548 549 struct iser_page_vec { 550 u64 *pages; 551 int length; 552 int offset; 553 int data_size; 554 }; 555 556 /** 557 * struct iser_global: iSER global context 558 * 559 * @device_list_mutex: protects device_list 560 * @device_list: iser devices global list 561 * @connlist_mutex: protects connlist 562 * @connlist: iser connections global list 563 * @desc_cache: kmem cache for tx dataout 564 */ 565 struct iser_global { 566 struct mutex device_list_mutex; 567 struct list_head device_list; 568 struct mutex connlist_mutex; 569 struct list_head connlist; 570 struct kmem_cache *desc_cache; 571 }; 572 573 extern struct iser_global ig; 574 extern int iser_debug_level; 575 extern bool iser_pi_enable; 576 extern int iser_pi_guard; 577 578 int iser_assign_reg_ops(struct iser_device *device); 579 580 int iser_send_control(struct iscsi_conn *conn, 581 struct iscsi_task *task); 582 583 int iser_send_command(struct iscsi_conn *conn, 584 struct iscsi_task *task); 585 586 int iser_send_data_out(struct iscsi_conn *conn, 587 struct iscsi_task *task, 588 struct iscsi_data *hdr); 589 590 void iscsi_iser_recv(struct iscsi_conn *conn, 591 struct iscsi_hdr *hdr, 592 char *rx_data, 593 int rx_data_len); 594 595 void iser_conn_init(struct iser_conn *iser_conn); 596 597 void iser_conn_release(struct iser_conn *iser_conn); 598 599 int iser_conn_terminate(struct iser_conn *iser_conn); 600 601 void iser_release_work(struct work_struct *work); 602 603 void iser_rcv_completion(struct iser_rx_desc *desc, 604 unsigned long dto_xfer_len, 605 struct ib_conn *ib_conn); 606 607 void iser_snd_completion(struct iser_tx_desc *desc, 608 struct ib_conn *ib_conn); 609 610 void iser_task_rdma_init(struct iscsi_iser_task *task); 611 612 void iser_task_rdma_finalize(struct iscsi_iser_task *task); 613 614 void iser_free_rx_descriptors(struct iser_conn *iser_conn); 615 616 void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task, 617 struct iser_data_buf *mem, 618 enum iser_data_dir cmd_dir); 619 620 int iser_reg_rdma_mem_fmr(struct iscsi_iser_task *task, 621 enum iser_data_dir cmd_dir); 622 int iser_reg_rdma_mem_fastreg(struct iscsi_iser_task *task, 623 enum iser_data_dir cmd_dir); 624 625 int iser_connect(struct iser_conn *iser_conn, 626 struct sockaddr *src_addr, 627 struct sockaddr *dst_addr, 628 int non_blocking); 629 630 void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task, 631 enum iser_data_dir cmd_dir); 632 void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task, 633 enum iser_data_dir cmd_dir); 634 635 int iser_post_recvl(struct iser_conn *iser_conn); 636 int iser_post_recvm(struct iser_conn *iser_conn, int count); 637 int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc, 638 bool signal); 639 640 int iser_dma_map_task_data(struct iscsi_iser_task *iser_task, 641 struct iser_data_buf *data, 642 enum iser_data_dir iser_dir, 643 enum dma_data_direction dma_dir); 644 645 void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task, 646 struct iser_data_buf *data, 647 enum dma_data_direction dir); 648 649 int iser_initialize_task_headers(struct iscsi_task *task, 650 struct iser_tx_desc *tx_desc); 651 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn, 652 struct iscsi_session *session); 653 int iser_alloc_fmr_pool(struct ib_conn *ib_conn, unsigned cmds_max); 654 void iser_free_fmr_pool(struct ib_conn *ib_conn); 655 int iser_alloc_fastreg_pool(struct ib_conn *ib_conn, unsigned cmds_max); 656 void iser_free_fastreg_pool(struct ib_conn *ib_conn); 657 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task, 658 enum iser_data_dir cmd_dir, sector_t *sector); 659 struct iser_fr_desc * 660 iser_reg_desc_get(struct ib_conn *ib_conn); 661 void 662 iser_reg_desc_put(struct ib_conn *ib_conn, 663 struct iser_fr_desc *desc); 664 #endif 665