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)) 101 102 /* Default support is 512KB I/O size */ 103 #define ISER_DEF_MAX_SECTORS 1024 104 #define ISCSI_ISER_DEF_SG_TABLESIZE ((ISER_DEF_MAX_SECTORS * 512) >> SHIFT_4K) 105 /* Maximum support is 8MB I/O size */ 106 #define ISCSI_ISER_MAX_SG_TABLESIZE ((16384 * 512) >> SHIFT_4K) 107 108 #define ISER_DEF_XMIT_CMDS_DEFAULT 512 109 #if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT 110 #define ISER_DEF_XMIT_CMDS_MAX ISCSI_DEF_XMIT_CMDS_MAX 111 #else 112 #define ISER_DEF_XMIT_CMDS_MAX ISER_DEF_XMIT_CMDS_DEFAULT 113 #endif 114 #define ISER_DEF_CMD_PER_LUN ISER_DEF_XMIT_CMDS_MAX 115 116 /* QP settings */ 117 /* Maximal bounds on received asynchronous PDUs */ 118 #define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */ 119 120 #define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), * 121 * SCSI_TMFUNC(2), LOGOUT(1) */ 122 123 #define ISER_QP_MAX_RECV_DTOS (ISER_DEF_XMIT_CMDS_MAX) 124 125 #define ISER_MIN_POSTED_RX (ISER_DEF_XMIT_CMDS_MAX >> 2) 126 127 /* the max TX (send) WR supported by the iSER QP is defined by * 128 * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect * 129 * to have at max for SCSI command. The tx posting & completion handling code * 130 * supports -EAGAIN scheme where tx is suspended till the QP has room for more * 131 * send WR. D=8 comes from 64K/8K */ 132 133 #define ISER_INFLIGHT_DATAOUTS 8 134 135 #define ISER_QP_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \ 136 (1 + ISER_INFLIGHT_DATAOUTS) + \ 137 ISER_MAX_TX_MISC_PDUS + \ 138 ISER_MAX_RX_MISC_PDUS) 139 140 /* Max registration work requests per command */ 141 #define ISER_MAX_REG_WR_PER_CMD 5 142 143 /* For Signature we don't support DATAOUTs so no need to make room for them */ 144 #define ISER_QP_SIG_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \ 145 (1 + ISER_MAX_REG_WR_PER_CMD) + \ 146 ISER_MAX_TX_MISC_PDUS + \ 147 ISER_MAX_RX_MISC_PDUS) 148 149 #define ISER_GET_MAX_XMIT_CMDS(send_wr) ((send_wr \ 150 - ISER_MAX_TX_MISC_PDUS \ 151 - ISER_MAX_RX_MISC_PDUS) / \ 152 (1 + ISER_INFLIGHT_DATAOUTS)) 153 154 #define ISER_WC_BATCH_COUNT 16 155 #define ISER_SIGNAL_CMD_COUNT 32 156 157 #define ISER_VER 0x10 158 #define ISER_WSV 0x08 159 #define ISER_RSV 0x04 160 161 #define ISER_FASTREG_LI_WRID 0xffffffffffffffffULL 162 #define ISER_BEACON_WRID 0xfffffffffffffffeULL 163 164 /** 165 * struct iser_hdr - iSER header 166 * 167 * @flags: flags support (zbva, remote_inv) 168 * @rsvd: reserved 169 * @write_stag: write rkey 170 * @write_va: write virtual address 171 * @reaf_stag: read rkey 172 * @read_va: read virtual address 173 */ 174 struct iser_hdr { 175 u8 flags; 176 u8 rsvd[3]; 177 __be32 write_stag; 178 __be64 write_va; 179 __be32 read_stag; 180 __be64 read_va; 181 } __attribute__((packed)); 182 183 184 #define ISER_ZBVA_NOT_SUPPORTED 0x80 185 #define ISER_SEND_W_INV_NOT_SUPPORTED 0x40 186 187 struct iser_cm_hdr { 188 u8 flags; 189 u8 rsvd[3]; 190 } __packed; 191 192 /* Constant PDU lengths calculations */ 193 #define ISER_HEADERS_LEN (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr)) 194 195 #define ISER_RECV_DATA_SEG_LEN 128 196 #define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN) 197 #define ISER_RX_LOGIN_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN) 198 199 /* Length of an object name string */ 200 #define ISER_OBJECT_NAME_SIZE 64 201 202 enum iser_conn_state { 203 ISER_CONN_INIT, /* descriptor allocd, no conn */ 204 ISER_CONN_PENDING, /* in the process of being established */ 205 ISER_CONN_UP, /* up and running */ 206 ISER_CONN_TERMINATING, /* in the process of being terminated */ 207 ISER_CONN_DOWN, /* shut down */ 208 ISER_CONN_STATES_NUM 209 }; 210 211 enum iser_task_status { 212 ISER_TASK_STATUS_INIT = 0, 213 ISER_TASK_STATUS_STARTED, 214 ISER_TASK_STATUS_COMPLETED 215 }; 216 217 enum iser_data_dir { 218 ISER_DIR_IN = 0, /* to initiator */ 219 ISER_DIR_OUT, /* from initiator */ 220 ISER_DIRS_NUM 221 }; 222 223 /** 224 * struct iser_data_buf - iSER data buffer 225 * 226 * @sg: pointer to the sg list 227 * @size: num entries of this sg 228 * @data_len: total beffer byte len 229 * @dma_nents: returned by dma_map_sg 230 * @orig_sg: pointer to the original sg list (in case 231 * we used a copy) 232 * @orig_size: num entris of orig sg list 233 */ 234 struct iser_data_buf { 235 struct scatterlist *sg; 236 unsigned int size; 237 unsigned long data_len; 238 unsigned int dma_nents; 239 struct scatterlist *orig_sg; 240 unsigned int orig_size; 241 }; 242 243 /* fwd declarations */ 244 struct iser_device; 245 struct iscsi_iser_task; 246 struct iscsi_endpoint; 247 struct iser_reg_resources; 248 249 /** 250 * struct iser_mem_reg - iSER memory registration info 251 * 252 * @sge: memory region sg element 253 * @rkey: memory region remote key 254 * @mem_h: pointer to registration context (FMR/Fastreg) 255 */ 256 struct iser_mem_reg { 257 struct ib_sge sge; 258 u32 rkey; 259 void *mem_h; 260 }; 261 262 enum iser_desc_type { 263 ISCSI_TX_CONTROL , 264 ISCSI_TX_SCSI_COMMAND, 265 ISCSI_TX_DATAOUT 266 }; 267 268 /* Maximum number of work requests per task: 269 * Data memory region local invalidate + fast registration 270 * Protection memory region local invalidate + fast registration 271 * Signature memory region local invalidate + fast registration 272 * PDU send 273 */ 274 #define ISER_MAX_WRS 7 275 276 /** 277 * struct iser_tx_desc - iSER TX descriptor (for send wr_id) 278 * 279 * @iser_header: iser header 280 * @iscsi_header: iscsi header 281 * @type: command/control/dataout 282 * @dam_addr: header buffer dma_address 283 * @tx_sg: sg[0] points to iser/iscsi headers 284 * sg[1] optionally points to either of immediate data 285 * unsolicited data-out or control 286 * @num_sge: number sges used on this TX task 287 * @mapped: Is the task header mapped 288 * @wr_idx: Current WR index 289 * @wrs: Array of WRs per task 290 * @data_reg: Data buffer registration details 291 * @prot_reg: Protection buffer registration details 292 * @sig_attrs: Signature attributes 293 */ 294 struct iser_tx_desc { 295 struct iser_hdr iser_header; 296 struct iscsi_hdr iscsi_header; 297 enum iser_desc_type type; 298 u64 dma_addr; 299 struct ib_sge tx_sg[2]; 300 int num_sge; 301 bool mapped; 302 u8 wr_idx; 303 struct ib_send_wr wrs[ISER_MAX_WRS]; 304 struct iser_mem_reg data_reg; 305 struct iser_mem_reg prot_reg; 306 struct ib_sig_attrs sig_attrs; 307 }; 308 309 #define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \ 310 sizeof(u64) + sizeof(struct ib_sge))) 311 /** 312 * struct iser_rx_desc - iSER RX descriptor (for recv wr_id) 313 * 314 * @iser_header: iser header 315 * @iscsi_header: iscsi header 316 * @data: received data segment 317 * @dma_addr: receive buffer dma address 318 * @rx_sg: ib_sge of receive buffer 319 * @pad: for sense data TODO: Modify to maximum sense length supported 320 */ 321 struct iser_rx_desc { 322 struct iser_hdr iser_header; 323 struct iscsi_hdr iscsi_header; 324 char data[ISER_RECV_DATA_SEG_LEN]; 325 u64 dma_addr; 326 struct ib_sge rx_sg; 327 char pad[ISER_RX_PAD_SIZE]; 328 } __attribute__((packed)); 329 330 struct iser_conn; 331 struct ib_conn; 332 struct iscsi_iser_task; 333 334 /** 335 * struct iser_comp - iSER completion context 336 * 337 * @device: pointer to device handle 338 * @cq: completion queue 339 * @wcs: work completion array 340 * @tasklet: Tasklet handle 341 * @active_qps: Number of active QPs attached 342 * to completion context 343 */ 344 struct iser_comp { 345 struct iser_device *device; 346 struct ib_cq *cq; 347 struct ib_wc wcs[ISER_WC_BATCH_COUNT]; 348 struct tasklet_struct tasklet; 349 int active_qps; 350 }; 351 352 /** 353 * struct iser_device - Memory registration operations 354 * per-device registration schemes 355 * 356 * @alloc_reg_res: Allocate registration resources 357 * @free_reg_res: Free registration resources 358 * @fast_reg_mem: Register memory buffers 359 * @unreg_mem: Un-register memory buffers 360 * @reg_desc_get: Get a registration descriptor for pool 361 * @reg_desc_put: Get a registration descriptor to pool 362 */ 363 struct iser_reg_ops { 364 int (*alloc_reg_res)(struct ib_conn *ib_conn, 365 unsigned cmds_max, 366 unsigned int size); 367 void (*free_reg_res)(struct ib_conn *ib_conn); 368 int (*reg_mem)(struct iscsi_iser_task *iser_task, 369 struct iser_data_buf *mem, 370 struct iser_reg_resources *rsc, 371 struct iser_mem_reg *reg); 372 void (*unreg_mem)(struct iscsi_iser_task *iser_task, 373 enum iser_data_dir cmd_dir); 374 struct iser_fr_desc * (*reg_desc_get)(struct ib_conn *ib_conn); 375 void (*reg_desc_put)(struct ib_conn *ib_conn, 376 struct iser_fr_desc *desc); 377 }; 378 379 /** 380 * struct iser_device - iSER device handle 381 * 382 * @ib_device: RDMA device 383 * @pd: Protection Domain for this device 384 * @dev_attr: Device attributes container 385 * @mr: Global DMA memory region 386 * @event_handler: IB events handle routine 387 * @ig_list: entry in devices list 388 * @refcount: Reference counter, dominated by open iser connections 389 * @comps_used: Number of completion contexts used, Min between online 390 * cpus and device max completion vectors 391 * @comps: Dinamically allocated array of completion handlers 392 * @reg_ops: Registration ops 393 */ 394 struct iser_device { 395 struct ib_device *ib_device; 396 struct ib_pd *pd; 397 struct ib_device_attr dev_attr; 398 struct ib_mr *mr; 399 struct ib_event_handler event_handler; 400 struct list_head ig_list; 401 int refcount; 402 int comps_used; 403 struct iser_comp *comps; 404 struct iser_reg_ops *reg_ops; 405 }; 406 407 #define ISER_CHECK_GUARD 0xc0 408 #define ISER_CHECK_REFTAG 0x0f 409 #define ISER_CHECK_APPTAG 0x30 410 411 /** 412 * struct iser_reg_resources - Fast registration recources 413 * 414 * @mr: memory region 415 * @fmr_pool: pool of fmrs 416 * @frpl: fast reg page list used by frwrs 417 * @page_vec: fast reg page list used by fmr pool 418 * @mr_valid: is mr valid indicator 419 */ 420 struct iser_reg_resources { 421 union { 422 struct ib_mr *mr; 423 struct ib_fmr_pool *fmr_pool; 424 }; 425 union { 426 struct ib_fast_reg_page_list *frpl; 427 struct iser_page_vec *page_vec; 428 }; 429 u8 mr_valid:1; 430 }; 431 432 /** 433 * struct iser_pi_context - Protection information context 434 * 435 * @rsc: protection buffer registration resources 436 * @sig_mr: signature enable memory region 437 * @sig_mr_valid: is sig_mr valid indicator 438 * @sig_protected: is region protected indicator 439 */ 440 struct iser_pi_context { 441 struct iser_reg_resources rsc; 442 struct ib_mr *sig_mr; 443 u8 sig_mr_valid:1; 444 u8 sig_protected:1; 445 }; 446 447 /** 448 * struct iser_fr_desc - Fast registration descriptor 449 * 450 * @list: entry in connection fastreg pool 451 * @rsc: data buffer registration resources 452 * @pi_ctx: protection information context 453 */ 454 struct iser_fr_desc { 455 struct list_head list; 456 struct iser_reg_resources rsc; 457 struct iser_pi_context *pi_ctx; 458 }; 459 460 /** 461 * struct iser_fr_pool: connection fast registration pool 462 * 463 * @list: list of fastreg descriptors 464 * @lock: protects fmr/fastreg pool 465 * @size: size of the pool 466 */ 467 struct iser_fr_pool { 468 struct list_head list; 469 spinlock_t lock; 470 int size; 471 }; 472 473 /** 474 * struct ib_conn - Infiniband related objects 475 * 476 * @cma_id: rdma_cm connection maneger handle 477 * @qp: Connection Queue-pair 478 * @post_recv_buf_count: post receive counter 479 * @sig_count: send work request signal count 480 * @rx_wr: receive work request for batch posts 481 * @device: reference to iser device 482 * @comp: iser completion context 483 * @pi_support: Indicate device T10-PI support 484 * @beacon: beacon send wr to signal all flush errors were drained 485 * @flush_comp: completes when all connection completions consumed 486 * @fr_pool: connection fast registration poool 487 */ 488 struct ib_conn { 489 struct rdma_cm_id *cma_id; 490 struct ib_qp *qp; 491 int post_recv_buf_count; 492 u8 sig_count; 493 struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX]; 494 struct iser_device *device; 495 struct iser_comp *comp; 496 bool pi_support; 497 struct ib_send_wr beacon; 498 struct completion flush_comp; 499 struct iser_fr_pool fr_pool; 500 }; 501 502 /** 503 * struct iser_conn - iSER connection context 504 * 505 * @ib_conn: connection RDMA resources 506 * @iscsi_conn: link to matching iscsi connection 507 * @ep: transport handle 508 * @state: connection logical state 509 * @qp_max_recv_dtos: maximum number of data outs, corresponds 510 * to max number of post recvs 511 * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1) 512 * @min_posted_rx: (qp_max_recv_dtos >> 2) 513 * @max_cmds: maximum cmds allowed for this connection 514 * @name: connection peer portal 515 * @release_work: deffered work for release job 516 * @state_mutex: protects iser onnection state 517 * @stop_completion: conn_stop completion 518 * @ib_completion: RDMA cleanup completion 519 * @up_completion: connection establishment completed 520 * (state is ISER_CONN_UP) 521 * @conn_list: entry in ig conn list 522 * @login_buf: login data buffer (stores login parameters) 523 * @login_req_buf: login request buffer 524 * @login_req_dma: login request buffer dma address 525 * @login_resp_buf: login response buffer 526 * @login_resp_dma: login response buffer dma address 527 * @rx_desc_head: head of rx_descs cyclic buffer 528 * @rx_descs: rx buffers array (cyclic buffer) 529 * @num_rx_descs: number of rx descriptors 530 * @scsi_sg_tablesize: scsi host sg_tablesize 531 * @scsi_max_sectors: scsi host max sectors 532 */ 533 struct iser_conn { 534 struct ib_conn ib_conn; 535 struct iscsi_conn *iscsi_conn; 536 struct iscsi_endpoint *ep; 537 enum iser_conn_state state; 538 unsigned qp_max_recv_dtos; 539 unsigned qp_max_recv_dtos_mask; 540 unsigned min_posted_rx; 541 u16 max_cmds; 542 char name[ISER_OBJECT_NAME_SIZE]; 543 struct work_struct release_work; 544 struct mutex state_mutex; 545 struct completion stop_completion; 546 struct completion ib_completion; 547 struct completion up_completion; 548 struct list_head conn_list; 549 550 char *login_buf; 551 char *login_req_buf, *login_resp_buf; 552 u64 login_req_dma, login_resp_dma; 553 unsigned int rx_desc_head; 554 struct iser_rx_desc *rx_descs; 555 u32 num_rx_descs; 556 unsigned short scsi_sg_tablesize; 557 unsigned int scsi_max_sectors; 558 }; 559 560 /** 561 * struct iscsi_iser_task - iser task context 562 * 563 * @desc: TX descriptor 564 * @iser_conn: link to iser connection 565 * @status: current task status 566 * @sc: link to scsi command 567 * @command_sent: indicate if command was sent 568 * @dir: iser data direction 569 * @rdma_reg: task rdma registration desc 570 * @data: iser data buffer desc 571 * @prot: iser protection buffer desc 572 */ 573 struct iscsi_iser_task { 574 struct iser_tx_desc desc; 575 struct iser_conn *iser_conn; 576 enum iser_task_status status; 577 struct scsi_cmnd *sc; 578 int command_sent; 579 int dir[ISER_DIRS_NUM]; 580 struct iser_mem_reg rdma_reg[ISER_DIRS_NUM]; 581 struct iser_data_buf data[ISER_DIRS_NUM]; 582 struct iser_data_buf prot[ISER_DIRS_NUM]; 583 }; 584 585 struct iser_page_vec { 586 u64 *pages; 587 int length; 588 int offset; 589 int data_size; 590 }; 591 592 /** 593 * struct iser_global: iSER global context 594 * 595 * @device_list_mutex: protects device_list 596 * @device_list: iser devices global list 597 * @connlist_mutex: protects connlist 598 * @connlist: iser connections global list 599 * @desc_cache: kmem cache for tx dataout 600 */ 601 struct iser_global { 602 struct mutex device_list_mutex; 603 struct list_head device_list; 604 struct mutex connlist_mutex; 605 struct list_head connlist; 606 struct kmem_cache *desc_cache; 607 }; 608 609 extern struct iser_global ig; 610 extern int iser_debug_level; 611 extern bool iser_pi_enable; 612 extern int iser_pi_guard; 613 extern unsigned int iser_max_sectors; 614 extern bool iser_always_reg; 615 616 int iser_assign_reg_ops(struct iser_device *device); 617 618 int iser_send_control(struct iscsi_conn *conn, 619 struct iscsi_task *task); 620 621 int iser_send_command(struct iscsi_conn *conn, 622 struct iscsi_task *task); 623 624 int iser_send_data_out(struct iscsi_conn *conn, 625 struct iscsi_task *task, 626 struct iscsi_data *hdr); 627 628 void iscsi_iser_recv(struct iscsi_conn *conn, 629 struct iscsi_hdr *hdr, 630 char *rx_data, 631 int rx_data_len); 632 633 void iser_conn_init(struct iser_conn *iser_conn); 634 635 void iser_conn_release(struct iser_conn *iser_conn); 636 637 int iser_conn_terminate(struct iser_conn *iser_conn); 638 639 void iser_release_work(struct work_struct *work); 640 641 void iser_rcv_completion(struct iser_rx_desc *desc, 642 unsigned long dto_xfer_len, 643 struct ib_conn *ib_conn); 644 645 void iser_snd_completion(struct iser_tx_desc *desc, 646 struct ib_conn *ib_conn); 647 648 void iser_task_rdma_init(struct iscsi_iser_task *task); 649 650 void iser_task_rdma_finalize(struct iscsi_iser_task *task); 651 652 void iser_free_rx_descriptors(struct iser_conn *iser_conn); 653 654 void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task, 655 struct iser_data_buf *mem, 656 enum iser_data_dir cmd_dir); 657 658 int iser_reg_rdma_mem(struct iscsi_iser_task *task, 659 enum iser_data_dir dir); 660 void iser_unreg_rdma_mem(struct iscsi_iser_task *task, 661 enum iser_data_dir dir); 662 663 int iser_connect(struct iser_conn *iser_conn, 664 struct sockaddr *src_addr, 665 struct sockaddr *dst_addr, 666 int non_blocking); 667 668 void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task, 669 enum iser_data_dir cmd_dir); 670 void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task, 671 enum iser_data_dir cmd_dir); 672 673 int iser_post_recvl(struct iser_conn *iser_conn); 674 int iser_post_recvm(struct iser_conn *iser_conn, int count); 675 int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc, 676 bool signal); 677 678 int iser_dma_map_task_data(struct iscsi_iser_task *iser_task, 679 struct iser_data_buf *data, 680 enum iser_data_dir iser_dir, 681 enum dma_data_direction dma_dir); 682 683 void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task, 684 struct iser_data_buf *data, 685 enum dma_data_direction dir); 686 687 int iser_initialize_task_headers(struct iscsi_task *task, 688 struct iser_tx_desc *tx_desc); 689 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn, 690 struct iscsi_session *session); 691 int iser_alloc_fmr_pool(struct ib_conn *ib_conn, 692 unsigned cmds_max, 693 unsigned int size); 694 void iser_free_fmr_pool(struct ib_conn *ib_conn); 695 int iser_alloc_fastreg_pool(struct ib_conn *ib_conn, 696 unsigned cmds_max, 697 unsigned int size); 698 void iser_free_fastreg_pool(struct ib_conn *ib_conn); 699 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task, 700 enum iser_data_dir cmd_dir, sector_t *sector); 701 struct iser_fr_desc * 702 iser_reg_desc_get_fr(struct ib_conn *ib_conn); 703 void 704 iser_reg_desc_put_fr(struct ib_conn *ib_conn, 705 struct iser_fr_desc *desc); 706 struct iser_fr_desc * 707 iser_reg_desc_get_fmr(struct ib_conn *ib_conn); 708 void 709 iser_reg_desc_put_fmr(struct ib_conn *ib_conn, 710 struct iser_fr_desc *desc); 711 712 static inline struct ib_send_wr * 713 iser_tx_next_wr(struct iser_tx_desc *tx_desc) 714 { 715 struct ib_send_wr *cur_wr = &tx_desc->wrs[tx_desc->wr_idx]; 716 struct ib_send_wr *last_wr; 717 718 if (tx_desc->wr_idx) { 719 last_wr = &tx_desc->wrs[tx_desc->wr_idx - 1]; 720 last_wr->next = cur_wr; 721 } 722 tx_desc->wr_idx++; 723 724 return cur_wr; 725 } 726 727 #endif 728