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 64 166 167 enum 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 }; 175 176 enum iser_task_status { 177 ISER_TASK_STATUS_INIT = 0, 178 ISER_TASK_STATUS_STARTED, 179 ISER_TASK_STATUS_COMPLETED 180 }; 181 182 enum 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 */ 196 struct iser_data_buf { 197 struct scatterlist *sg; 198 int size; 199 unsigned long data_len; 200 int dma_nents; 201 }; 202 203 /* fwd declarations */ 204 struct iser_device; 205 struct iscsi_iser_task; 206 struct iscsi_endpoint; 207 struct 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 */ 216 struct iser_mem_reg { 217 struct ib_sge sge; 218 u32 rkey; 219 void *mem_h; 220 }; 221 222 enum iser_desc_type { 223 ISCSI_TX_CONTROL , 224 ISCSI_TX_SCSI_COMMAND, 225 ISCSI_TX_DATAOUT 226 }; 227 228 /* 229 * Maximum number of work requests per task 230 * (invalidate, registration, send) 231 */ 232 #define ISER_MAX_WRS 3 233 234 /** 235 * struct iser_tx_desc - iSER TX descriptor 236 * 237 * @iser_header: iser header 238 * @iscsi_header: iscsi header 239 * @type: command/control/dataout 240 * @dam_addr: header buffer dma_address 241 * @tx_sg: sg[0] points to iser/iscsi headers 242 * sg[1] optionally points to either of immediate data 243 * unsolicited data-out or control 244 * @num_sge: number sges used on this TX task 245 * @mapped: Is the task header mapped 246 * @wr_idx: Current WR index 247 * @wrs: Array of WRs per task 248 */ 249 struct iser_tx_desc { 250 struct iser_ctrl iser_header; 251 struct iscsi_hdr iscsi_header; 252 enum iser_desc_type type; 253 u64 dma_addr; 254 struct ib_sge tx_sg[2]; 255 int num_sge; 256 struct ib_cqe cqe; 257 bool mapped; 258 u8 wr_idx; 259 union iser_wr { 260 struct ib_send_wr send; 261 struct ib_reg_wr fast_reg; 262 } wrs[ISER_MAX_WRS]; 263 }; 264 265 #define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \ 266 sizeof(u64) + sizeof(struct ib_sge) + \ 267 sizeof(struct ib_cqe))) 268 /** 269 * struct iser_rx_desc - iSER RX descriptor 270 * 271 * @iser_header: iser header 272 * @iscsi_header: iscsi header 273 * @data: received data segment 274 * @dma_addr: receive buffer dma address 275 * @rx_sg: ib_sge of receive buffer 276 * @pad: for sense data TODO: Modify to maximum sense length supported 277 */ 278 struct iser_rx_desc { 279 struct iser_ctrl iser_header; 280 struct iscsi_hdr iscsi_header; 281 char data[ISER_RECV_DATA_SEG_LEN]; 282 u64 dma_addr; 283 struct ib_sge rx_sg; 284 struct ib_cqe cqe; 285 char pad[ISER_RX_PAD_SIZE]; 286 } __packed; 287 288 /** 289 * struct iser_login_desc - iSER login descriptor 290 * 291 * @req: pointer to login request buffer 292 * @resp: pointer to login response buffer 293 * @req_dma: DMA address of login request buffer 294 * @rsp_dma: DMA address of login response buffer 295 * @sge: IB sge for login post recv 296 * @cqe: completion handler 297 */ 298 struct iser_login_desc { 299 void *req; 300 void *rsp; 301 u64 req_dma; 302 u64 rsp_dma; 303 struct ib_sge sge; 304 struct ib_cqe cqe; 305 } __packed; 306 307 struct iser_conn; 308 struct ib_conn; 309 struct iscsi_iser_task; 310 311 /** 312 * struct iser_comp - iSER completion context 313 * 314 * @cq: completion queue 315 * @active_qps: Number of active QPs attached 316 * to completion context 317 */ 318 struct iser_comp { 319 struct ib_cq *cq; 320 int active_qps; 321 }; 322 323 /** 324 * struct iser_device - Memory registration operations 325 * per-device registration schemes 326 * 327 * @alloc_reg_res: Allocate registration resources 328 * @free_reg_res: Free registration resources 329 * @fast_reg_mem: Register memory buffers 330 * @unreg_mem: Un-register memory buffers 331 * @reg_desc_get: Get a registration descriptor for pool 332 * @reg_desc_put: Get a registration descriptor to pool 333 */ 334 struct iser_reg_ops { 335 int (*alloc_reg_res)(struct ib_conn *ib_conn, 336 unsigned cmds_max, 337 unsigned int size); 338 void (*free_reg_res)(struct ib_conn *ib_conn); 339 int (*reg_mem)(struct iscsi_iser_task *iser_task, 340 struct iser_data_buf *mem, 341 struct iser_reg_resources *rsc, 342 struct iser_mem_reg *reg); 343 void (*unreg_mem)(struct iscsi_iser_task *iser_task, 344 enum iser_data_dir cmd_dir); 345 struct iser_fr_desc * (*reg_desc_get)(struct ib_conn *ib_conn); 346 void (*reg_desc_put)(struct ib_conn *ib_conn, 347 struct iser_fr_desc *desc); 348 }; 349 350 /** 351 * struct iser_device - iSER device handle 352 * 353 * @ib_device: RDMA device 354 * @pd: Protection Domain for this device 355 * @mr: Global DMA memory region 356 * @event_handler: IB events handle routine 357 * @ig_list: entry in devices list 358 * @refcount: Reference counter, dominated by open iser connections 359 * @comps_used: Number of completion contexts used, Min between online 360 * cpus and device max completion vectors 361 * @comps: Dinamically allocated array of completion handlers 362 * @reg_ops: Registration ops 363 * @remote_inv_sup: Remote invalidate is supported on this device 364 */ 365 struct iser_device { 366 struct ib_device *ib_device; 367 struct ib_pd *pd; 368 struct ib_event_handler event_handler; 369 struct list_head ig_list; 370 int refcount; 371 int comps_used; 372 struct iser_comp *comps; 373 const struct iser_reg_ops *reg_ops; 374 bool remote_inv_sup; 375 }; 376 377 /** 378 * struct iser_reg_resources - Fast registration recources 379 * 380 * @mr: memory region 381 * @fmr_pool: pool of fmrs 382 * @sig_mr: signature memory region 383 * @page_vec: fast reg page list used by fmr pool 384 * @mr_valid: is mr valid indicator 385 */ 386 struct iser_reg_resources { 387 union { 388 struct ib_mr *mr; 389 struct ib_fmr_pool *fmr_pool; 390 }; 391 struct ib_mr *sig_mr; 392 struct iser_page_vec *page_vec; 393 u8 mr_valid:1; 394 }; 395 396 /** 397 * struct iser_fr_desc - Fast registration descriptor 398 * 399 * @list: entry in connection fastreg pool 400 * @rsc: data buffer registration resources 401 * @sig_protected: is region protected indicator 402 */ 403 struct iser_fr_desc { 404 struct list_head list; 405 struct iser_reg_resources rsc; 406 bool sig_protected; 407 struct list_head all_list; 408 }; 409 410 /** 411 * struct iser_fr_pool: connection fast registration pool 412 * 413 * @list: list of fastreg descriptors 414 * @lock: protects fmr/fastreg pool 415 * @size: size of the pool 416 */ 417 struct iser_fr_pool { 418 struct list_head list; 419 spinlock_t lock; 420 int size; 421 struct list_head all_list; 422 }; 423 424 /** 425 * struct ib_conn - Infiniband related objects 426 * 427 * @cma_id: rdma_cm connection maneger handle 428 * @qp: Connection Queue-pair 429 * @post_recv_buf_count: post receive counter 430 * @sig_count: send work request signal count 431 * @rx_wr: receive work request for batch posts 432 * @device: reference to iser device 433 * @comp: iser completion context 434 * @fr_pool: connection fast registration poool 435 * @pi_support: Indicate device T10-PI support 436 */ 437 struct ib_conn { 438 struct rdma_cm_id *cma_id; 439 struct ib_qp *qp; 440 int post_recv_buf_count; 441 u8 sig_count; 442 struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX]; 443 struct iser_device *device; 444 struct iser_comp *comp; 445 struct iser_fr_pool fr_pool; 446 bool pi_support; 447 struct ib_cqe reg_cqe; 448 }; 449 450 /** 451 * struct iser_conn - iSER connection context 452 * 453 * @ib_conn: connection RDMA resources 454 * @iscsi_conn: link to matching iscsi connection 455 * @ep: transport handle 456 * @state: connection logical state 457 * @qp_max_recv_dtos: maximum number of data outs, corresponds 458 * to max number of post recvs 459 * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1) 460 * @min_posted_rx: (qp_max_recv_dtos >> 2) 461 * @max_cmds: maximum cmds allowed for this connection 462 * @name: connection peer portal 463 * @release_work: deffered work for release job 464 * @state_mutex: protects iser onnection state 465 * @stop_completion: conn_stop completion 466 * @ib_completion: RDMA cleanup completion 467 * @up_completion: connection establishment completed 468 * (state is ISER_CONN_UP) 469 * @conn_list: entry in ig conn list 470 * @login_desc: login descriptor 471 * @rx_desc_head: head of rx_descs cyclic buffer 472 * @rx_descs: rx buffers array (cyclic buffer) 473 * @num_rx_descs: number of rx descriptors 474 * @scsi_sg_tablesize: scsi host sg_tablesize 475 * @pages_per_mr: maximum pages available for registration 476 */ 477 struct iser_conn { 478 struct ib_conn ib_conn; 479 struct iscsi_conn *iscsi_conn; 480 struct iscsi_endpoint *ep; 481 enum iser_conn_state state; 482 unsigned qp_max_recv_dtos; 483 unsigned qp_max_recv_dtos_mask; 484 unsigned min_posted_rx; 485 u16 max_cmds; 486 char name[ISER_OBJECT_NAME_SIZE]; 487 struct work_struct release_work; 488 struct mutex state_mutex; 489 struct completion stop_completion; 490 struct completion ib_completion; 491 struct completion up_completion; 492 struct list_head conn_list; 493 struct iser_login_desc login_desc; 494 unsigned int rx_desc_head; 495 struct iser_rx_desc *rx_descs; 496 u32 num_rx_descs; 497 unsigned short scsi_sg_tablesize; 498 unsigned short pages_per_mr; 499 bool snd_w_inv; 500 }; 501 502 /** 503 * struct iscsi_iser_task - iser task context 504 * 505 * @desc: TX descriptor 506 * @iser_conn: link to iser connection 507 * @status: current task status 508 * @sc: link to scsi command 509 * @command_sent: indicate if command was sent 510 * @dir: iser data direction 511 * @rdma_reg: task rdma registration desc 512 * @data: iser data buffer desc 513 * @prot: iser protection buffer desc 514 */ 515 struct iscsi_iser_task { 516 struct iser_tx_desc desc; 517 struct iser_conn *iser_conn; 518 enum iser_task_status status; 519 struct scsi_cmnd *sc; 520 int command_sent; 521 int dir[ISER_DIRS_NUM]; 522 struct iser_mem_reg rdma_reg[ISER_DIRS_NUM]; 523 struct iser_data_buf data[ISER_DIRS_NUM]; 524 struct iser_data_buf prot[ISER_DIRS_NUM]; 525 }; 526 527 struct iser_page_vec { 528 u64 *pages; 529 int npages; 530 struct ib_mr fake_mr; 531 }; 532 533 /** 534 * struct iser_global: iSER global context 535 * 536 * @device_list_mutex: protects device_list 537 * @device_list: iser devices global list 538 * @connlist_mutex: protects connlist 539 * @connlist: iser connections global list 540 * @desc_cache: kmem cache for tx dataout 541 */ 542 struct iser_global { 543 struct mutex device_list_mutex; 544 struct list_head device_list; 545 struct mutex connlist_mutex; 546 struct list_head connlist; 547 struct kmem_cache *desc_cache; 548 }; 549 550 extern struct iser_global ig; 551 extern int iser_debug_level; 552 extern bool iser_pi_enable; 553 extern int iser_pi_guard; 554 extern unsigned int iser_max_sectors; 555 extern bool iser_always_reg; 556 557 int iser_assign_reg_ops(struct iser_device *device); 558 559 int iser_send_control(struct iscsi_conn *conn, 560 struct iscsi_task *task); 561 562 int iser_send_command(struct iscsi_conn *conn, 563 struct iscsi_task *task); 564 565 int iser_send_data_out(struct iscsi_conn *conn, 566 struct iscsi_task *task, 567 struct iscsi_data *hdr); 568 569 void iscsi_iser_recv(struct iscsi_conn *conn, 570 struct iscsi_hdr *hdr, 571 char *rx_data, 572 int rx_data_len); 573 574 void iser_conn_init(struct iser_conn *iser_conn); 575 576 void iser_conn_release(struct iser_conn *iser_conn); 577 578 int iser_conn_terminate(struct iser_conn *iser_conn); 579 580 void iser_release_work(struct work_struct *work); 581 582 void iser_err_comp(struct ib_wc *wc, const char *type); 583 void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc); 584 void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc); 585 void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc); 586 void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc); 587 void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc); 588 void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc); 589 590 void iser_task_rdma_init(struct iscsi_iser_task *task); 591 592 void iser_task_rdma_finalize(struct iscsi_iser_task *task); 593 594 void iser_free_rx_descriptors(struct iser_conn *iser_conn); 595 596 void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task, 597 struct iser_data_buf *mem, 598 enum iser_data_dir cmd_dir); 599 600 int iser_reg_rdma_mem(struct iscsi_iser_task *task, 601 enum iser_data_dir dir, 602 bool all_imm); 603 void iser_unreg_rdma_mem(struct iscsi_iser_task *task, 604 enum iser_data_dir dir); 605 606 int iser_connect(struct iser_conn *iser_conn, 607 struct sockaddr *src_addr, 608 struct sockaddr *dst_addr, 609 int non_blocking); 610 611 void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task, 612 enum iser_data_dir cmd_dir); 613 void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task, 614 enum iser_data_dir cmd_dir); 615 616 int iser_post_recvl(struct iser_conn *iser_conn); 617 int iser_post_recvm(struct iser_conn *iser_conn, int count); 618 int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc, 619 bool signal); 620 621 int iser_dma_map_task_data(struct iscsi_iser_task *iser_task, 622 struct iser_data_buf *data, 623 enum iser_data_dir iser_dir, 624 enum dma_data_direction dma_dir); 625 626 void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task, 627 struct iser_data_buf *data, 628 enum dma_data_direction dir); 629 630 int iser_initialize_task_headers(struct iscsi_task *task, 631 struct iser_tx_desc *tx_desc); 632 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn, 633 struct iscsi_session *session); 634 int iser_alloc_fmr_pool(struct ib_conn *ib_conn, 635 unsigned cmds_max, 636 unsigned int size); 637 void iser_free_fmr_pool(struct ib_conn *ib_conn); 638 int iser_alloc_fastreg_pool(struct ib_conn *ib_conn, 639 unsigned cmds_max, 640 unsigned int size); 641 void iser_free_fastreg_pool(struct ib_conn *ib_conn); 642 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task, 643 enum iser_data_dir cmd_dir, sector_t *sector); 644 struct iser_fr_desc * 645 iser_reg_desc_get_fr(struct ib_conn *ib_conn); 646 void 647 iser_reg_desc_put_fr(struct ib_conn *ib_conn, 648 struct iser_fr_desc *desc); 649 struct iser_fr_desc * 650 iser_reg_desc_get_fmr(struct ib_conn *ib_conn); 651 void 652 iser_reg_desc_put_fmr(struct ib_conn *ib_conn, 653 struct iser_fr_desc *desc); 654 655 static inline struct ib_send_wr * 656 iser_tx_next_wr(struct iser_tx_desc *tx_desc) 657 { 658 struct ib_send_wr *cur_wr = &tx_desc->wrs[tx_desc->wr_idx].send; 659 struct ib_send_wr *last_wr; 660 661 if (tx_desc->wr_idx) { 662 last_wr = &tx_desc->wrs[tx_desc->wr_idx - 1].send; 663 last_wr->next = cur_wr; 664 } 665 tx_desc->wr_idx++; 666 667 return cur_wr; 668 } 669 670 static inline struct iser_conn * 671 to_iser_conn(struct ib_conn *ib_conn) 672 { 673 return container_of(ib_conn, struct iser_conn, ib_conn); 674 } 675 676 static inline struct iser_rx_desc * 677 iser_rx(struct ib_cqe *cqe) 678 { 679 return container_of(cqe, struct iser_rx_desc, cqe); 680 } 681 682 static inline struct iser_tx_desc * 683 iser_tx(struct ib_cqe *cqe) 684 { 685 return container_of(cqe, struct iser_tx_desc, cqe); 686 } 687 688 static inline struct iser_login_desc * 689 iser_login(struct ib_cqe *cqe) 690 { 691 return container_of(cqe, struct iser_login_desc, cqe); 692 } 693 694 #endif 695