1 /* 2 * Copyright (c) 2005 Cisco Systems. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 33 #define pr_fmt(fmt) PFX fmt 34 35 #include <linux/module.h> 36 #include <linux/init.h> 37 #include <linux/slab.h> 38 #include <linux/err.h> 39 #include <linux/string.h> 40 #include <linux/parser.h> 41 #include <linux/random.h> 42 #include <linux/jiffies.h> 43 44 #include <linux/atomic.h> 45 46 #include <scsi/scsi.h> 47 #include <scsi/scsi_device.h> 48 #include <scsi/scsi_dbg.h> 49 #include <scsi/srp.h> 50 #include <scsi/scsi_transport_srp.h> 51 52 #include "ib_srp.h" 53 54 #define DRV_NAME "ib_srp" 55 #define PFX DRV_NAME ": " 56 #define DRV_VERSION "1.0" 57 #define DRV_RELDATE "July 1, 2013" 58 59 MODULE_AUTHOR("Roland Dreier"); 60 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator " 61 "v" DRV_VERSION " (" DRV_RELDATE ")"); 62 MODULE_LICENSE("Dual BSD/GPL"); 63 64 static unsigned int srp_sg_tablesize; 65 static unsigned int cmd_sg_entries; 66 static unsigned int indirect_sg_entries; 67 static bool allow_ext_sg; 68 static int topspin_workarounds = 1; 69 70 module_param(srp_sg_tablesize, uint, 0444); 71 MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries"); 72 73 module_param(cmd_sg_entries, uint, 0444); 74 MODULE_PARM_DESC(cmd_sg_entries, 75 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)"); 76 77 module_param(indirect_sg_entries, uint, 0444); 78 MODULE_PARM_DESC(indirect_sg_entries, 79 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")"); 80 81 module_param(allow_ext_sg, bool, 0444); 82 MODULE_PARM_DESC(allow_ext_sg, 83 "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)"); 84 85 module_param(topspin_workarounds, int, 0444); 86 MODULE_PARM_DESC(topspin_workarounds, 87 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0"); 88 89 static void srp_add_one(struct ib_device *device); 90 static void srp_remove_one(struct ib_device *device); 91 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr); 92 static void srp_send_completion(struct ib_cq *cq, void *target_ptr); 93 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event); 94 95 static struct scsi_transport_template *ib_srp_transport_template; 96 97 static struct ib_client srp_client = { 98 .name = "srp", 99 .add = srp_add_one, 100 .remove = srp_remove_one 101 }; 102 103 static struct ib_sa_client srp_sa_client; 104 105 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host) 106 { 107 return (struct srp_target_port *) host->hostdata; 108 } 109 110 static const char *srp_target_info(struct Scsi_Host *host) 111 { 112 return host_to_target(host)->target_name; 113 } 114 115 static int srp_target_is_topspin(struct srp_target_port *target) 116 { 117 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad }; 118 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d }; 119 120 return topspin_workarounds && 121 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) || 122 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui)); 123 } 124 125 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size, 126 gfp_t gfp_mask, 127 enum dma_data_direction direction) 128 { 129 struct srp_iu *iu; 130 131 iu = kmalloc(sizeof *iu, gfp_mask); 132 if (!iu) 133 goto out; 134 135 iu->buf = kzalloc(size, gfp_mask); 136 if (!iu->buf) 137 goto out_free_iu; 138 139 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size, 140 direction); 141 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma)) 142 goto out_free_buf; 143 144 iu->size = size; 145 iu->direction = direction; 146 147 return iu; 148 149 out_free_buf: 150 kfree(iu->buf); 151 out_free_iu: 152 kfree(iu); 153 out: 154 return NULL; 155 } 156 157 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu) 158 { 159 if (!iu) 160 return; 161 162 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size, 163 iu->direction); 164 kfree(iu->buf); 165 kfree(iu); 166 } 167 168 static void srp_qp_event(struct ib_event *event, void *context) 169 { 170 pr_debug("QP event %d\n", event->event); 171 } 172 173 static int srp_init_qp(struct srp_target_port *target, 174 struct ib_qp *qp) 175 { 176 struct ib_qp_attr *attr; 177 int ret; 178 179 attr = kmalloc(sizeof *attr, GFP_KERNEL); 180 if (!attr) 181 return -ENOMEM; 182 183 ret = ib_find_pkey(target->srp_host->srp_dev->dev, 184 target->srp_host->port, 185 be16_to_cpu(target->path.pkey), 186 &attr->pkey_index); 187 if (ret) 188 goto out; 189 190 attr->qp_state = IB_QPS_INIT; 191 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ | 192 IB_ACCESS_REMOTE_WRITE); 193 attr->port_num = target->srp_host->port; 194 195 ret = ib_modify_qp(qp, attr, 196 IB_QP_STATE | 197 IB_QP_PKEY_INDEX | 198 IB_QP_ACCESS_FLAGS | 199 IB_QP_PORT); 200 201 out: 202 kfree(attr); 203 return ret; 204 } 205 206 static int srp_new_cm_id(struct srp_target_port *target) 207 { 208 struct ib_cm_id *new_cm_id; 209 210 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev, 211 srp_cm_handler, target); 212 if (IS_ERR(new_cm_id)) 213 return PTR_ERR(new_cm_id); 214 215 if (target->cm_id) 216 ib_destroy_cm_id(target->cm_id); 217 target->cm_id = new_cm_id; 218 219 return 0; 220 } 221 222 static int srp_create_target_ib(struct srp_target_port *target) 223 { 224 struct ib_qp_init_attr *init_attr; 225 struct ib_cq *recv_cq, *send_cq; 226 struct ib_qp *qp; 227 int ret; 228 229 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL); 230 if (!init_attr) 231 return -ENOMEM; 232 233 recv_cq = ib_create_cq(target->srp_host->srp_dev->dev, 234 srp_recv_completion, NULL, target, SRP_RQ_SIZE, 235 target->comp_vector); 236 if (IS_ERR(recv_cq)) { 237 ret = PTR_ERR(recv_cq); 238 goto err; 239 } 240 241 send_cq = ib_create_cq(target->srp_host->srp_dev->dev, 242 srp_send_completion, NULL, target, SRP_SQ_SIZE, 243 target->comp_vector); 244 if (IS_ERR(send_cq)) { 245 ret = PTR_ERR(send_cq); 246 goto err_recv_cq; 247 } 248 249 ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP); 250 251 init_attr->event_handler = srp_qp_event; 252 init_attr->cap.max_send_wr = SRP_SQ_SIZE; 253 init_attr->cap.max_recv_wr = SRP_RQ_SIZE; 254 init_attr->cap.max_recv_sge = 1; 255 init_attr->cap.max_send_sge = 1; 256 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR; 257 init_attr->qp_type = IB_QPT_RC; 258 init_attr->send_cq = send_cq; 259 init_attr->recv_cq = recv_cq; 260 261 qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr); 262 if (IS_ERR(qp)) { 263 ret = PTR_ERR(qp); 264 goto err_send_cq; 265 } 266 267 ret = srp_init_qp(target, qp); 268 if (ret) 269 goto err_qp; 270 271 if (target->qp) 272 ib_destroy_qp(target->qp); 273 if (target->recv_cq) 274 ib_destroy_cq(target->recv_cq); 275 if (target->send_cq) 276 ib_destroy_cq(target->send_cq); 277 278 target->qp = qp; 279 target->recv_cq = recv_cq; 280 target->send_cq = send_cq; 281 282 kfree(init_attr); 283 return 0; 284 285 err_qp: 286 ib_destroy_qp(qp); 287 288 err_send_cq: 289 ib_destroy_cq(send_cq); 290 291 err_recv_cq: 292 ib_destroy_cq(recv_cq); 293 294 err: 295 kfree(init_attr); 296 return ret; 297 } 298 299 static void srp_free_target_ib(struct srp_target_port *target) 300 { 301 int i; 302 303 ib_destroy_qp(target->qp); 304 ib_destroy_cq(target->send_cq); 305 ib_destroy_cq(target->recv_cq); 306 307 target->qp = NULL; 308 target->send_cq = target->recv_cq = NULL; 309 310 for (i = 0; i < SRP_RQ_SIZE; ++i) 311 srp_free_iu(target->srp_host, target->rx_ring[i]); 312 for (i = 0; i < SRP_SQ_SIZE; ++i) 313 srp_free_iu(target->srp_host, target->tx_ring[i]); 314 } 315 316 static void srp_path_rec_completion(int status, 317 struct ib_sa_path_rec *pathrec, 318 void *target_ptr) 319 { 320 struct srp_target_port *target = target_ptr; 321 322 target->status = status; 323 if (status) 324 shost_printk(KERN_ERR, target->scsi_host, 325 PFX "Got failed path rec status %d\n", status); 326 else 327 target->path = *pathrec; 328 complete(&target->done); 329 } 330 331 static int srp_lookup_path(struct srp_target_port *target) 332 { 333 target->path.numb_path = 1; 334 335 init_completion(&target->done); 336 337 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client, 338 target->srp_host->srp_dev->dev, 339 target->srp_host->port, 340 &target->path, 341 IB_SA_PATH_REC_SERVICE_ID | 342 IB_SA_PATH_REC_DGID | 343 IB_SA_PATH_REC_SGID | 344 IB_SA_PATH_REC_NUMB_PATH | 345 IB_SA_PATH_REC_PKEY, 346 SRP_PATH_REC_TIMEOUT_MS, 347 GFP_KERNEL, 348 srp_path_rec_completion, 349 target, &target->path_query); 350 if (target->path_query_id < 0) 351 return target->path_query_id; 352 353 wait_for_completion(&target->done); 354 355 if (target->status < 0) 356 shost_printk(KERN_WARNING, target->scsi_host, 357 PFX "Path record query failed\n"); 358 359 return target->status; 360 } 361 362 static int srp_send_req(struct srp_target_port *target) 363 { 364 struct { 365 struct ib_cm_req_param param; 366 struct srp_login_req priv; 367 } *req = NULL; 368 int status; 369 370 req = kzalloc(sizeof *req, GFP_KERNEL); 371 if (!req) 372 return -ENOMEM; 373 374 req->param.primary_path = &target->path; 375 req->param.alternate_path = NULL; 376 req->param.service_id = target->service_id; 377 req->param.qp_num = target->qp->qp_num; 378 req->param.qp_type = target->qp->qp_type; 379 req->param.private_data = &req->priv; 380 req->param.private_data_len = sizeof req->priv; 381 req->param.flow_control = 1; 382 383 get_random_bytes(&req->param.starting_psn, 4); 384 req->param.starting_psn &= 0xffffff; 385 386 /* 387 * Pick some arbitrary defaults here; we could make these 388 * module parameters if anyone cared about setting them. 389 */ 390 req->param.responder_resources = 4; 391 req->param.remote_cm_response_timeout = 20; 392 req->param.local_cm_response_timeout = 20; 393 req->param.retry_count = 7; 394 req->param.rnr_retry_count = 7; 395 req->param.max_cm_retries = 15; 396 397 req->priv.opcode = SRP_LOGIN_REQ; 398 req->priv.tag = 0; 399 req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len); 400 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | 401 SRP_BUF_FORMAT_INDIRECT); 402 /* 403 * In the published SRP specification (draft rev. 16a), the 404 * port identifier format is 8 bytes of ID extension followed 405 * by 8 bytes of GUID. Older drafts put the two halves in the 406 * opposite order, so that the GUID comes first. 407 * 408 * Targets conforming to these obsolete drafts can be 409 * recognized by the I/O Class they report. 410 */ 411 if (target->io_class == SRP_REV10_IB_IO_CLASS) { 412 memcpy(req->priv.initiator_port_id, 413 &target->path.sgid.global.interface_id, 8); 414 memcpy(req->priv.initiator_port_id + 8, 415 &target->initiator_ext, 8); 416 memcpy(req->priv.target_port_id, &target->ioc_guid, 8); 417 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8); 418 } else { 419 memcpy(req->priv.initiator_port_id, 420 &target->initiator_ext, 8); 421 memcpy(req->priv.initiator_port_id + 8, 422 &target->path.sgid.global.interface_id, 8); 423 memcpy(req->priv.target_port_id, &target->id_ext, 8); 424 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8); 425 } 426 427 /* 428 * Topspin/Cisco SRP targets will reject our login unless we 429 * zero out the first 8 bytes of our initiator port ID and set 430 * the second 8 bytes to the local node GUID. 431 */ 432 if (srp_target_is_topspin(target)) { 433 shost_printk(KERN_DEBUG, target->scsi_host, 434 PFX "Topspin/Cisco initiator port ID workaround " 435 "activated for target GUID %016llx\n", 436 (unsigned long long) be64_to_cpu(target->ioc_guid)); 437 memset(req->priv.initiator_port_id, 0, 8); 438 memcpy(req->priv.initiator_port_id + 8, 439 &target->srp_host->srp_dev->dev->node_guid, 8); 440 } 441 442 status = ib_send_cm_req(target->cm_id, &req->param); 443 444 kfree(req); 445 446 return status; 447 } 448 449 static bool srp_queue_remove_work(struct srp_target_port *target) 450 { 451 bool changed = false; 452 453 spin_lock_irq(&target->lock); 454 if (target->state != SRP_TARGET_REMOVED) { 455 target->state = SRP_TARGET_REMOVED; 456 changed = true; 457 } 458 spin_unlock_irq(&target->lock); 459 460 if (changed) 461 queue_work(system_long_wq, &target->remove_work); 462 463 return changed; 464 } 465 466 static bool srp_change_conn_state(struct srp_target_port *target, 467 bool connected) 468 { 469 bool changed = false; 470 471 spin_lock_irq(&target->lock); 472 if (target->connected != connected) { 473 target->connected = connected; 474 changed = true; 475 } 476 spin_unlock_irq(&target->lock); 477 478 return changed; 479 } 480 481 static void srp_disconnect_target(struct srp_target_port *target) 482 { 483 if (srp_change_conn_state(target, false)) { 484 /* XXX should send SRP_I_LOGOUT request */ 485 486 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) { 487 shost_printk(KERN_DEBUG, target->scsi_host, 488 PFX "Sending CM DREQ failed\n"); 489 } 490 } 491 } 492 493 static void srp_free_req_data(struct srp_target_port *target) 494 { 495 struct ib_device *ibdev = target->srp_host->srp_dev->dev; 496 struct srp_request *req; 497 int i; 498 499 for (i = 0, req = target->req_ring; i < SRP_CMD_SQ_SIZE; ++i, ++req) { 500 kfree(req->fmr_list); 501 kfree(req->map_page); 502 if (req->indirect_dma_addr) { 503 ib_dma_unmap_single(ibdev, req->indirect_dma_addr, 504 target->indirect_size, 505 DMA_TO_DEVICE); 506 } 507 kfree(req->indirect_desc); 508 } 509 } 510 511 /** 512 * srp_del_scsi_host_attr() - Remove attributes defined in the host template. 513 * @shost: SCSI host whose attributes to remove from sysfs. 514 * 515 * Note: Any attributes defined in the host template and that did not exist 516 * before invocation of this function will be ignored. 517 */ 518 static void srp_del_scsi_host_attr(struct Scsi_Host *shost) 519 { 520 struct device_attribute **attr; 521 522 for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr) 523 device_remove_file(&shost->shost_dev, *attr); 524 } 525 526 static void srp_remove_target(struct srp_target_port *target) 527 { 528 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED); 529 530 srp_del_scsi_host_attr(target->scsi_host); 531 srp_remove_host(target->scsi_host); 532 scsi_remove_host(target->scsi_host); 533 srp_disconnect_target(target); 534 ib_destroy_cm_id(target->cm_id); 535 srp_free_target_ib(target); 536 srp_free_req_data(target); 537 scsi_host_put(target->scsi_host); 538 } 539 540 static void srp_remove_work(struct work_struct *work) 541 { 542 struct srp_target_port *target = 543 container_of(work, struct srp_target_port, remove_work); 544 545 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED); 546 547 srp_remove_target(target); 548 549 spin_lock(&target->srp_host->target_lock); 550 list_del(&target->list); 551 spin_unlock(&target->srp_host->target_lock); 552 } 553 554 static void srp_rport_delete(struct srp_rport *rport) 555 { 556 struct srp_target_port *target = rport->lld_data; 557 558 srp_queue_remove_work(target); 559 } 560 561 static int srp_connect_target(struct srp_target_port *target) 562 { 563 int retries = 3; 564 int ret; 565 566 WARN_ON_ONCE(target->connected); 567 568 target->qp_in_error = false; 569 570 ret = srp_lookup_path(target); 571 if (ret) 572 return ret; 573 574 while (1) { 575 init_completion(&target->done); 576 ret = srp_send_req(target); 577 if (ret) 578 return ret; 579 wait_for_completion(&target->done); 580 581 /* 582 * The CM event handling code will set status to 583 * SRP_PORT_REDIRECT if we get a port redirect REJ 584 * back, or SRP_DLID_REDIRECT if we get a lid/qp 585 * redirect REJ back. 586 */ 587 switch (target->status) { 588 case 0: 589 srp_change_conn_state(target, true); 590 return 0; 591 592 case SRP_PORT_REDIRECT: 593 ret = srp_lookup_path(target); 594 if (ret) 595 return ret; 596 break; 597 598 case SRP_DLID_REDIRECT: 599 break; 600 601 case SRP_STALE_CONN: 602 /* Our current CM id was stale, and is now in timewait. 603 * Try to reconnect with a new one. 604 */ 605 if (!retries-- || srp_new_cm_id(target)) { 606 shost_printk(KERN_ERR, target->scsi_host, PFX 607 "giving up on stale connection\n"); 608 target->status = -ECONNRESET; 609 return target->status; 610 } 611 612 shost_printk(KERN_ERR, target->scsi_host, PFX 613 "retrying stale connection\n"); 614 break; 615 616 default: 617 return target->status; 618 } 619 } 620 } 621 622 static void srp_unmap_data(struct scsi_cmnd *scmnd, 623 struct srp_target_port *target, 624 struct srp_request *req) 625 { 626 struct ib_device *ibdev = target->srp_host->srp_dev->dev; 627 struct ib_pool_fmr **pfmr; 628 629 if (!scsi_sglist(scmnd) || 630 (scmnd->sc_data_direction != DMA_TO_DEVICE && 631 scmnd->sc_data_direction != DMA_FROM_DEVICE)) 632 return; 633 634 pfmr = req->fmr_list; 635 while (req->nfmr--) 636 ib_fmr_pool_unmap(*pfmr++); 637 638 ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd), 639 scmnd->sc_data_direction); 640 } 641 642 /** 643 * srp_claim_req - Take ownership of the scmnd associated with a request. 644 * @target: SRP target port. 645 * @req: SRP request. 646 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take 647 * ownership of @req->scmnd if it equals @scmnd. 648 * 649 * Return value: 650 * Either NULL or a pointer to the SCSI command the caller became owner of. 651 */ 652 static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target, 653 struct srp_request *req, 654 struct scsi_cmnd *scmnd) 655 { 656 unsigned long flags; 657 658 spin_lock_irqsave(&target->lock, flags); 659 if (!scmnd) { 660 scmnd = req->scmnd; 661 req->scmnd = NULL; 662 } else if (req->scmnd == scmnd) { 663 req->scmnd = NULL; 664 } else { 665 scmnd = NULL; 666 } 667 spin_unlock_irqrestore(&target->lock, flags); 668 669 return scmnd; 670 } 671 672 /** 673 * srp_free_req() - Unmap data and add request to the free request list. 674 */ 675 static void srp_free_req(struct srp_target_port *target, 676 struct srp_request *req, struct scsi_cmnd *scmnd, 677 s32 req_lim_delta) 678 { 679 unsigned long flags; 680 681 srp_unmap_data(scmnd, target, req); 682 683 spin_lock_irqsave(&target->lock, flags); 684 target->req_lim += req_lim_delta; 685 list_add_tail(&req->list, &target->free_reqs); 686 spin_unlock_irqrestore(&target->lock, flags); 687 } 688 689 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req) 690 { 691 struct scsi_cmnd *scmnd = srp_claim_req(target, req, NULL); 692 693 if (scmnd) { 694 srp_free_req(target, req, scmnd, 0); 695 scmnd->result = DID_RESET << 16; 696 scmnd->scsi_done(scmnd); 697 } 698 } 699 700 static int srp_reconnect_target(struct srp_target_port *target) 701 { 702 struct Scsi_Host *shost = target->scsi_host; 703 int i, ret; 704 705 scsi_target_block(&shost->shost_gendev); 706 707 srp_disconnect_target(target); 708 /* 709 * Now get a new local CM ID so that we avoid confusing the target in 710 * case things are really fouled up. Doing so also ensures that all CM 711 * callbacks will have finished before a new QP is allocated. 712 */ 713 ret = srp_new_cm_id(target); 714 /* 715 * Whether or not creating a new CM ID succeeded, create a new 716 * QP. This guarantees that all completion callback function 717 * invocations have finished before request resetting starts. 718 */ 719 if (ret == 0) 720 ret = srp_create_target_ib(target); 721 else 722 srp_create_target_ib(target); 723 724 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) { 725 struct srp_request *req = &target->req_ring[i]; 726 if (req->scmnd) 727 srp_reset_req(target, req); 728 } 729 730 INIT_LIST_HEAD(&target->free_tx); 731 for (i = 0; i < SRP_SQ_SIZE; ++i) 732 list_add(&target->tx_ring[i]->list, &target->free_tx); 733 734 if (ret == 0) 735 ret = srp_connect_target(target); 736 737 scsi_target_unblock(&shost->shost_gendev, ret == 0 ? SDEV_RUNNING : 738 SDEV_TRANSPORT_OFFLINE); 739 target->transport_offline = !!ret; 740 741 if (ret) 742 goto err; 743 744 shost_printk(KERN_INFO, target->scsi_host, PFX "reconnect succeeded\n"); 745 746 return ret; 747 748 err: 749 shost_printk(KERN_ERR, target->scsi_host, 750 PFX "reconnect failed (%d), removing target port.\n", ret); 751 752 /* 753 * We couldn't reconnect, so kill our target port off. 754 * However, we have to defer the real removal because we 755 * are in the context of the SCSI error handler now, which 756 * will deadlock if we call scsi_remove_host(). 757 */ 758 srp_queue_remove_work(target); 759 760 return ret; 761 } 762 763 static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr, 764 unsigned int dma_len, u32 rkey) 765 { 766 struct srp_direct_buf *desc = state->desc; 767 768 desc->va = cpu_to_be64(dma_addr); 769 desc->key = cpu_to_be32(rkey); 770 desc->len = cpu_to_be32(dma_len); 771 772 state->total_len += dma_len; 773 state->desc++; 774 state->ndesc++; 775 } 776 777 static int srp_map_finish_fmr(struct srp_map_state *state, 778 struct srp_target_port *target) 779 { 780 struct srp_device *dev = target->srp_host->srp_dev; 781 struct ib_pool_fmr *fmr; 782 u64 io_addr = 0; 783 784 if (!state->npages) 785 return 0; 786 787 if (state->npages == 1) { 788 srp_map_desc(state, state->base_dma_addr, state->fmr_len, 789 target->rkey); 790 state->npages = state->fmr_len = 0; 791 return 0; 792 } 793 794 fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages, 795 state->npages, io_addr); 796 if (IS_ERR(fmr)) 797 return PTR_ERR(fmr); 798 799 *state->next_fmr++ = fmr; 800 state->nfmr++; 801 802 srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey); 803 state->npages = state->fmr_len = 0; 804 return 0; 805 } 806 807 static void srp_map_update_start(struct srp_map_state *state, 808 struct scatterlist *sg, int sg_index, 809 dma_addr_t dma_addr) 810 { 811 state->unmapped_sg = sg; 812 state->unmapped_index = sg_index; 813 state->unmapped_addr = dma_addr; 814 } 815 816 static int srp_map_sg_entry(struct srp_map_state *state, 817 struct srp_target_port *target, 818 struct scatterlist *sg, int sg_index, 819 int use_fmr) 820 { 821 struct srp_device *dev = target->srp_host->srp_dev; 822 struct ib_device *ibdev = dev->dev; 823 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg); 824 unsigned int dma_len = ib_sg_dma_len(ibdev, sg); 825 unsigned int len; 826 int ret; 827 828 if (!dma_len) 829 return 0; 830 831 if (use_fmr == SRP_MAP_NO_FMR) { 832 /* Once we're in direct map mode for a request, we don't 833 * go back to FMR mode, so no need to update anything 834 * other than the descriptor. 835 */ 836 srp_map_desc(state, dma_addr, dma_len, target->rkey); 837 return 0; 838 } 839 840 /* If we start at an offset into the FMR page, don't merge into 841 * the current FMR. Finish it out, and use the kernel's MR for this 842 * sg entry. This is to avoid potential bugs on some SRP targets 843 * that were never quite defined, but went away when the initiator 844 * avoided using FMR on such page fragments. 845 */ 846 if (dma_addr & ~dev->fmr_page_mask || dma_len > dev->fmr_max_size) { 847 ret = srp_map_finish_fmr(state, target); 848 if (ret) 849 return ret; 850 851 srp_map_desc(state, dma_addr, dma_len, target->rkey); 852 srp_map_update_start(state, NULL, 0, 0); 853 return 0; 854 } 855 856 /* If this is the first sg to go into the FMR, save our position. 857 * We need to know the first unmapped entry, its index, and the 858 * first unmapped address within that entry to be able to restart 859 * mapping after an error. 860 */ 861 if (!state->unmapped_sg) 862 srp_map_update_start(state, sg, sg_index, dma_addr); 863 864 while (dma_len) { 865 if (state->npages == SRP_FMR_SIZE) { 866 ret = srp_map_finish_fmr(state, target); 867 if (ret) 868 return ret; 869 870 srp_map_update_start(state, sg, sg_index, dma_addr); 871 } 872 873 len = min_t(unsigned int, dma_len, dev->fmr_page_size); 874 875 if (!state->npages) 876 state->base_dma_addr = dma_addr; 877 state->pages[state->npages++] = dma_addr; 878 state->fmr_len += len; 879 dma_addr += len; 880 dma_len -= len; 881 } 882 883 /* If the last entry of the FMR wasn't a full page, then we need to 884 * close it out and start a new one -- we can only merge at page 885 * boundries. 886 */ 887 ret = 0; 888 if (len != dev->fmr_page_size) { 889 ret = srp_map_finish_fmr(state, target); 890 if (!ret) 891 srp_map_update_start(state, NULL, 0, 0); 892 } 893 return ret; 894 } 895 896 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target, 897 struct srp_request *req) 898 { 899 struct scatterlist *scat, *sg; 900 struct srp_cmd *cmd = req->cmd->buf; 901 int i, len, nents, count, use_fmr; 902 struct srp_device *dev; 903 struct ib_device *ibdev; 904 struct srp_map_state state; 905 struct srp_indirect_buf *indirect_hdr; 906 u32 table_len; 907 u8 fmt; 908 909 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE) 910 return sizeof (struct srp_cmd); 911 912 if (scmnd->sc_data_direction != DMA_FROM_DEVICE && 913 scmnd->sc_data_direction != DMA_TO_DEVICE) { 914 shost_printk(KERN_WARNING, target->scsi_host, 915 PFX "Unhandled data direction %d\n", 916 scmnd->sc_data_direction); 917 return -EINVAL; 918 } 919 920 nents = scsi_sg_count(scmnd); 921 scat = scsi_sglist(scmnd); 922 923 dev = target->srp_host->srp_dev; 924 ibdev = dev->dev; 925 926 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction); 927 if (unlikely(count == 0)) 928 return -EIO; 929 930 fmt = SRP_DATA_DESC_DIRECT; 931 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf); 932 933 if (count == 1) { 934 /* 935 * The midlayer only generated a single gather/scatter 936 * entry, or DMA mapping coalesced everything to a 937 * single entry. So a direct descriptor along with 938 * the DMA MR suffices. 939 */ 940 struct srp_direct_buf *buf = (void *) cmd->add_data; 941 942 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat)); 943 buf->key = cpu_to_be32(target->rkey); 944 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat)); 945 946 req->nfmr = 0; 947 goto map_complete; 948 } 949 950 /* We have more than one scatter/gather entry, so build our indirect 951 * descriptor table, trying to merge as many entries with FMR as we 952 * can. 953 */ 954 indirect_hdr = (void *) cmd->add_data; 955 956 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr, 957 target->indirect_size, DMA_TO_DEVICE); 958 959 memset(&state, 0, sizeof(state)); 960 state.desc = req->indirect_desc; 961 state.pages = req->map_page; 962 state.next_fmr = req->fmr_list; 963 964 use_fmr = dev->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR; 965 966 for_each_sg(scat, sg, count, i) { 967 if (srp_map_sg_entry(&state, target, sg, i, use_fmr)) { 968 /* FMR mapping failed, so backtrack to the first 969 * unmapped entry and continue on without using FMR. 970 */ 971 dma_addr_t dma_addr; 972 unsigned int dma_len; 973 974 backtrack: 975 sg = state.unmapped_sg; 976 i = state.unmapped_index; 977 978 dma_addr = ib_sg_dma_address(ibdev, sg); 979 dma_len = ib_sg_dma_len(ibdev, sg); 980 dma_len -= (state.unmapped_addr - dma_addr); 981 dma_addr = state.unmapped_addr; 982 use_fmr = SRP_MAP_NO_FMR; 983 srp_map_desc(&state, dma_addr, dma_len, target->rkey); 984 } 985 } 986 987 if (use_fmr == SRP_MAP_ALLOW_FMR && srp_map_finish_fmr(&state, target)) 988 goto backtrack; 989 990 /* We've mapped the request, now pull as much of the indirect 991 * descriptor table as we can into the command buffer. If this 992 * target is not using an external indirect table, we are 993 * guaranteed to fit into the command, as the SCSI layer won't 994 * give us more S/G entries than we allow. 995 */ 996 req->nfmr = state.nfmr; 997 if (state.ndesc == 1) { 998 /* FMR mapping was able to collapse this to one entry, 999 * so use a direct descriptor. 1000 */ 1001 struct srp_direct_buf *buf = (void *) cmd->add_data; 1002 1003 *buf = req->indirect_desc[0]; 1004 goto map_complete; 1005 } 1006 1007 if (unlikely(target->cmd_sg_cnt < state.ndesc && 1008 !target->allow_ext_sg)) { 1009 shost_printk(KERN_ERR, target->scsi_host, 1010 "Could not fit S/G list into SRP_CMD\n"); 1011 return -EIO; 1012 } 1013 1014 count = min(state.ndesc, target->cmd_sg_cnt); 1015 table_len = state.ndesc * sizeof (struct srp_direct_buf); 1016 1017 fmt = SRP_DATA_DESC_INDIRECT; 1018 len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf); 1019 len += count * sizeof (struct srp_direct_buf); 1020 1021 memcpy(indirect_hdr->desc_list, req->indirect_desc, 1022 count * sizeof (struct srp_direct_buf)); 1023 1024 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr); 1025 indirect_hdr->table_desc.key = cpu_to_be32(target->rkey); 1026 indirect_hdr->table_desc.len = cpu_to_be32(table_len); 1027 indirect_hdr->len = cpu_to_be32(state.total_len); 1028 1029 if (scmnd->sc_data_direction == DMA_TO_DEVICE) 1030 cmd->data_out_desc_cnt = count; 1031 else 1032 cmd->data_in_desc_cnt = count; 1033 1034 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len, 1035 DMA_TO_DEVICE); 1036 1037 map_complete: 1038 if (scmnd->sc_data_direction == DMA_TO_DEVICE) 1039 cmd->buf_fmt = fmt << 4; 1040 else 1041 cmd->buf_fmt = fmt; 1042 1043 return len; 1044 } 1045 1046 /* 1047 * Return an IU and possible credit to the free pool 1048 */ 1049 static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu, 1050 enum srp_iu_type iu_type) 1051 { 1052 unsigned long flags; 1053 1054 spin_lock_irqsave(&target->lock, flags); 1055 list_add(&iu->list, &target->free_tx); 1056 if (iu_type != SRP_IU_RSP) 1057 ++target->req_lim; 1058 spin_unlock_irqrestore(&target->lock, flags); 1059 } 1060 1061 /* 1062 * Must be called with target->lock held to protect req_lim and free_tx. 1063 * If IU is not sent, it must be returned using srp_put_tx_iu(). 1064 * 1065 * Note: 1066 * An upper limit for the number of allocated information units for each 1067 * request type is: 1068 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues 1069 * more than Scsi_Host.can_queue requests. 1070 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE. 1071 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than 1072 * one unanswered SRP request to an initiator. 1073 */ 1074 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target, 1075 enum srp_iu_type iu_type) 1076 { 1077 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE; 1078 struct srp_iu *iu; 1079 1080 srp_send_completion(target->send_cq, target); 1081 1082 if (list_empty(&target->free_tx)) 1083 return NULL; 1084 1085 /* Initiator responses to target requests do not consume credits */ 1086 if (iu_type != SRP_IU_RSP) { 1087 if (target->req_lim <= rsv) { 1088 ++target->zero_req_lim; 1089 return NULL; 1090 } 1091 1092 --target->req_lim; 1093 } 1094 1095 iu = list_first_entry(&target->free_tx, struct srp_iu, list); 1096 list_del(&iu->list); 1097 return iu; 1098 } 1099 1100 static int srp_post_send(struct srp_target_port *target, 1101 struct srp_iu *iu, int len) 1102 { 1103 struct ib_sge list; 1104 struct ib_send_wr wr, *bad_wr; 1105 1106 list.addr = iu->dma; 1107 list.length = len; 1108 list.lkey = target->lkey; 1109 1110 wr.next = NULL; 1111 wr.wr_id = (uintptr_t) iu; 1112 wr.sg_list = &list; 1113 wr.num_sge = 1; 1114 wr.opcode = IB_WR_SEND; 1115 wr.send_flags = IB_SEND_SIGNALED; 1116 1117 return ib_post_send(target->qp, &wr, &bad_wr); 1118 } 1119 1120 static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu) 1121 { 1122 struct ib_recv_wr wr, *bad_wr; 1123 struct ib_sge list; 1124 1125 list.addr = iu->dma; 1126 list.length = iu->size; 1127 list.lkey = target->lkey; 1128 1129 wr.next = NULL; 1130 wr.wr_id = (uintptr_t) iu; 1131 wr.sg_list = &list; 1132 wr.num_sge = 1; 1133 1134 return ib_post_recv(target->qp, &wr, &bad_wr); 1135 } 1136 1137 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp) 1138 { 1139 struct srp_request *req; 1140 struct scsi_cmnd *scmnd; 1141 unsigned long flags; 1142 1143 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) { 1144 spin_lock_irqsave(&target->lock, flags); 1145 target->req_lim += be32_to_cpu(rsp->req_lim_delta); 1146 spin_unlock_irqrestore(&target->lock, flags); 1147 1148 target->tsk_mgmt_status = -1; 1149 if (be32_to_cpu(rsp->resp_data_len) >= 4) 1150 target->tsk_mgmt_status = rsp->data[3]; 1151 complete(&target->tsk_mgmt_done); 1152 } else { 1153 req = &target->req_ring[rsp->tag]; 1154 scmnd = srp_claim_req(target, req, NULL); 1155 if (!scmnd) { 1156 shost_printk(KERN_ERR, target->scsi_host, 1157 "Null scmnd for RSP w/tag %016llx\n", 1158 (unsigned long long) rsp->tag); 1159 1160 spin_lock_irqsave(&target->lock, flags); 1161 target->req_lim += be32_to_cpu(rsp->req_lim_delta); 1162 spin_unlock_irqrestore(&target->lock, flags); 1163 1164 return; 1165 } 1166 scmnd->result = rsp->status; 1167 1168 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) { 1169 memcpy(scmnd->sense_buffer, rsp->data + 1170 be32_to_cpu(rsp->resp_data_len), 1171 min_t(int, be32_to_cpu(rsp->sense_data_len), 1172 SCSI_SENSE_BUFFERSIZE)); 1173 } 1174 1175 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER)) 1176 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt)); 1177 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER)) 1178 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt)); 1179 1180 srp_free_req(target, req, scmnd, 1181 be32_to_cpu(rsp->req_lim_delta)); 1182 1183 scmnd->host_scribble = NULL; 1184 scmnd->scsi_done(scmnd); 1185 } 1186 } 1187 1188 static int srp_response_common(struct srp_target_port *target, s32 req_delta, 1189 void *rsp, int len) 1190 { 1191 struct ib_device *dev = target->srp_host->srp_dev->dev; 1192 unsigned long flags; 1193 struct srp_iu *iu; 1194 int err; 1195 1196 spin_lock_irqsave(&target->lock, flags); 1197 target->req_lim += req_delta; 1198 iu = __srp_get_tx_iu(target, SRP_IU_RSP); 1199 spin_unlock_irqrestore(&target->lock, flags); 1200 1201 if (!iu) { 1202 shost_printk(KERN_ERR, target->scsi_host, PFX 1203 "no IU available to send response\n"); 1204 return 1; 1205 } 1206 1207 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE); 1208 memcpy(iu->buf, rsp, len); 1209 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE); 1210 1211 err = srp_post_send(target, iu, len); 1212 if (err) { 1213 shost_printk(KERN_ERR, target->scsi_host, PFX 1214 "unable to post response: %d\n", err); 1215 srp_put_tx_iu(target, iu, SRP_IU_RSP); 1216 } 1217 1218 return err; 1219 } 1220 1221 static void srp_process_cred_req(struct srp_target_port *target, 1222 struct srp_cred_req *req) 1223 { 1224 struct srp_cred_rsp rsp = { 1225 .opcode = SRP_CRED_RSP, 1226 .tag = req->tag, 1227 }; 1228 s32 delta = be32_to_cpu(req->req_lim_delta); 1229 1230 if (srp_response_common(target, delta, &rsp, sizeof rsp)) 1231 shost_printk(KERN_ERR, target->scsi_host, PFX 1232 "problems processing SRP_CRED_REQ\n"); 1233 } 1234 1235 static void srp_process_aer_req(struct srp_target_port *target, 1236 struct srp_aer_req *req) 1237 { 1238 struct srp_aer_rsp rsp = { 1239 .opcode = SRP_AER_RSP, 1240 .tag = req->tag, 1241 }; 1242 s32 delta = be32_to_cpu(req->req_lim_delta); 1243 1244 shost_printk(KERN_ERR, target->scsi_host, PFX 1245 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun)); 1246 1247 if (srp_response_common(target, delta, &rsp, sizeof rsp)) 1248 shost_printk(KERN_ERR, target->scsi_host, PFX 1249 "problems processing SRP_AER_REQ\n"); 1250 } 1251 1252 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc) 1253 { 1254 struct ib_device *dev = target->srp_host->srp_dev->dev; 1255 struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id; 1256 int res; 1257 u8 opcode; 1258 1259 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len, 1260 DMA_FROM_DEVICE); 1261 1262 opcode = *(u8 *) iu->buf; 1263 1264 if (0) { 1265 shost_printk(KERN_ERR, target->scsi_host, 1266 PFX "recv completion, opcode 0x%02x\n", opcode); 1267 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1, 1268 iu->buf, wc->byte_len, true); 1269 } 1270 1271 switch (opcode) { 1272 case SRP_RSP: 1273 srp_process_rsp(target, iu->buf); 1274 break; 1275 1276 case SRP_CRED_REQ: 1277 srp_process_cred_req(target, iu->buf); 1278 break; 1279 1280 case SRP_AER_REQ: 1281 srp_process_aer_req(target, iu->buf); 1282 break; 1283 1284 case SRP_T_LOGOUT: 1285 /* XXX Handle target logout */ 1286 shost_printk(KERN_WARNING, target->scsi_host, 1287 PFX "Got target logout request\n"); 1288 break; 1289 1290 default: 1291 shost_printk(KERN_WARNING, target->scsi_host, 1292 PFX "Unhandled SRP opcode 0x%02x\n", opcode); 1293 break; 1294 } 1295 1296 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len, 1297 DMA_FROM_DEVICE); 1298 1299 res = srp_post_recv(target, iu); 1300 if (res != 0) 1301 shost_printk(KERN_ERR, target->scsi_host, 1302 PFX "Recv failed with error code %d\n", res); 1303 } 1304 1305 static void srp_handle_qp_err(enum ib_wc_status wc_status, 1306 enum ib_wc_opcode wc_opcode, 1307 struct srp_target_port *target) 1308 { 1309 if (target->connected && !target->qp_in_error) { 1310 shost_printk(KERN_ERR, target->scsi_host, 1311 PFX "failed %s status %d\n", 1312 wc_opcode & IB_WC_RECV ? "receive" : "send", 1313 wc_status); 1314 } 1315 target->qp_in_error = true; 1316 } 1317 1318 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr) 1319 { 1320 struct srp_target_port *target = target_ptr; 1321 struct ib_wc wc; 1322 1323 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); 1324 while (ib_poll_cq(cq, 1, &wc) > 0) { 1325 if (likely(wc.status == IB_WC_SUCCESS)) { 1326 srp_handle_recv(target, &wc); 1327 } else { 1328 srp_handle_qp_err(wc.status, wc.opcode, target); 1329 } 1330 } 1331 } 1332 1333 static void srp_send_completion(struct ib_cq *cq, void *target_ptr) 1334 { 1335 struct srp_target_port *target = target_ptr; 1336 struct ib_wc wc; 1337 struct srp_iu *iu; 1338 1339 while (ib_poll_cq(cq, 1, &wc) > 0) { 1340 if (likely(wc.status == IB_WC_SUCCESS)) { 1341 iu = (struct srp_iu *) (uintptr_t) wc.wr_id; 1342 list_add(&iu->list, &target->free_tx); 1343 } else { 1344 srp_handle_qp_err(wc.status, wc.opcode, target); 1345 } 1346 } 1347 } 1348 1349 static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd) 1350 { 1351 struct srp_target_port *target = host_to_target(shost); 1352 struct srp_request *req; 1353 struct srp_iu *iu; 1354 struct srp_cmd *cmd; 1355 struct ib_device *dev; 1356 unsigned long flags; 1357 int len; 1358 1359 if (unlikely(target->transport_offline)) { 1360 scmnd->result = DID_NO_CONNECT << 16; 1361 scmnd->scsi_done(scmnd); 1362 return 0; 1363 } 1364 1365 spin_lock_irqsave(&target->lock, flags); 1366 iu = __srp_get_tx_iu(target, SRP_IU_CMD); 1367 if (!iu) 1368 goto err_unlock; 1369 1370 req = list_first_entry(&target->free_reqs, struct srp_request, list); 1371 list_del(&req->list); 1372 spin_unlock_irqrestore(&target->lock, flags); 1373 1374 dev = target->srp_host->srp_dev->dev; 1375 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len, 1376 DMA_TO_DEVICE); 1377 1378 scmnd->result = 0; 1379 scmnd->host_scribble = (void *) req; 1380 1381 cmd = iu->buf; 1382 memset(cmd, 0, sizeof *cmd); 1383 1384 cmd->opcode = SRP_CMD; 1385 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48); 1386 cmd->tag = req->index; 1387 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len); 1388 1389 req->scmnd = scmnd; 1390 req->cmd = iu; 1391 1392 len = srp_map_data(scmnd, target, req); 1393 if (len < 0) { 1394 shost_printk(KERN_ERR, target->scsi_host, 1395 PFX "Failed to map data\n"); 1396 goto err_iu; 1397 } 1398 1399 ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len, 1400 DMA_TO_DEVICE); 1401 1402 if (srp_post_send(target, iu, len)) { 1403 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n"); 1404 goto err_unmap; 1405 } 1406 1407 return 0; 1408 1409 err_unmap: 1410 srp_unmap_data(scmnd, target, req); 1411 1412 err_iu: 1413 srp_put_tx_iu(target, iu, SRP_IU_CMD); 1414 1415 spin_lock_irqsave(&target->lock, flags); 1416 list_add(&req->list, &target->free_reqs); 1417 1418 err_unlock: 1419 spin_unlock_irqrestore(&target->lock, flags); 1420 1421 return SCSI_MLQUEUE_HOST_BUSY; 1422 } 1423 1424 static int srp_alloc_iu_bufs(struct srp_target_port *target) 1425 { 1426 int i; 1427 1428 for (i = 0; i < SRP_RQ_SIZE; ++i) { 1429 target->rx_ring[i] = srp_alloc_iu(target->srp_host, 1430 target->max_ti_iu_len, 1431 GFP_KERNEL, DMA_FROM_DEVICE); 1432 if (!target->rx_ring[i]) 1433 goto err; 1434 } 1435 1436 for (i = 0; i < SRP_SQ_SIZE; ++i) { 1437 target->tx_ring[i] = srp_alloc_iu(target->srp_host, 1438 target->max_iu_len, 1439 GFP_KERNEL, DMA_TO_DEVICE); 1440 if (!target->tx_ring[i]) 1441 goto err; 1442 1443 list_add(&target->tx_ring[i]->list, &target->free_tx); 1444 } 1445 1446 return 0; 1447 1448 err: 1449 for (i = 0; i < SRP_RQ_SIZE; ++i) { 1450 srp_free_iu(target->srp_host, target->rx_ring[i]); 1451 target->rx_ring[i] = NULL; 1452 } 1453 1454 for (i = 0; i < SRP_SQ_SIZE; ++i) { 1455 srp_free_iu(target->srp_host, target->tx_ring[i]); 1456 target->tx_ring[i] = NULL; 1457 } 1458 1459 return -ENOMEM; 1460 } 1461 1462 static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask) 1463 { 1464 uint64_t T_tr_ns, max_compl_time_ms; 1465 uint32_t rq_tmo_jiffies; 1466 1467 /* 1468 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair, 1469 * table 91), both the QP timeout and the retry count have to be set 1470 * for RC QP's during the RTR to RTS transition. 1471 */ 1472 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) != 1473 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)); 1474 1475 /* 1476 * Set target->rq_tmo_jiffies to one second more than the largest time 1477 * it can take before an error completion is generated. See also 1478 * C9-140..142 in the IBTA spec for more information about how to 1479 * convert the QP Local ACK Timeout value to nanoseconds. 1480 */ 1481 T_tr_ns = 4096 * (1ULL << qp_attr->timeout); 1482 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns; 1483 do_div(max_compl_time_ms, NSEC_PER_MSEC); 1484 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000); 1485 1486 return rq_tmo_jiffies; 1487 } 1488 1489 static void srp_cm_rep_handler(struct ib_cm_id *cm_id, 1490 struct srp_login_rsp *lrsp, 1491 struct srp_target_port *target) 1492 { 1493 struct ib_qp_attr *qp_attr = NULL; 1494 int attr_mask = 0; 1495 int ret; 1496 int i; 1497 1498 if (lrsp->opcode == SRP_LOGIN_RSP) { 1499 target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len); 1500 target->req_lim = be32_to_cpu(lrsp->req_lim_delta); 1501 1502 /* 1503 * Reserve credits for task management so we don't 1504 * bounce requests back to the SCSI mid-layer. 1505 */ 1506 target->scsi_host->can_queue 1507 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE, 1508 target->scsi_host->can_queue); 1509 } else { 1510 shost_printk(KERN_WARNING, target->scsi_host, 1511 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode); 1512 ret = -ECONNRESET; 1513 goto error; 1514 } 1515 1516 if (!target->rx_ring[0]) { 1517 ret = srp_alloc_iu_bufs(target); 1518 if (ret) 1519 goto error; 1520 } 1521 1522 ret = -ENOMEM; 1523 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL); 1524 if (!qp_attr) 1525 goto error; 1526 1527 qp_attr->qp_state = IB_QPS_RTR; 1528 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); 1529 if (ret) 1530 goto error_free; 1531 1532 ret = ib_modify_qp(target->qp, qp_attr, attr_mask); 1533 if (ret) 1534 goto error_free; 1535 1536 for (i = 0; i < SRP_RQ_SIZE; i++) { 1537 struct srp_iu *iu = target->rx_ring[i]; 1538 ret = srp_post_recv(target, iu); 1539 if (ret) 1540 goto error_free; 1541 } 1542 1543 qp_attr->qp_state = IB_QPS_RTS; 1544 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); 1545 if (ret) 1546 goto error_free; 1547 1548 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask); 1549 1550 ret = ib_modify_qp(target->qp, qp_attr, attr_mask); 1551 if (ret) 1552 goto error_free; 1553 1554 ret = ib_send_cm_rtu(cm_id, NULL, 0); 1555 1556 error_free: 1557 kfree(qp_attr); 1558 1559 error: 1560 target->status = ret; 1561 } 1562 1563 static void srp_cm_rej_handler(struct ib_cm_id *cm_id, 1564 struct ib_cm_event *event, 1565 struct srp_target_port *target) 1566 { 1567 struct Scsi_Host *shost = target->scsi_host; 1568 struct ib_class_port_info *cpi; 1569 int opcode; 1570 1571 switch (event->param.rej_rcvd.reason) { 1572 case IB_CM_REJ_PORT_CM_REDIRECT: 1573 cpi = event->param.rej_rcvd.ari; 1574 target->path.dlid = cpi->redirect_lid; 1575 target->path.pkey = cpi->redirect_pkey; 1576 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff; 1577 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16); 1578 1579 target->status = target->path.dlid ? 1580 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT; 1581 break; 1582 1583 case IB_CM_REJ_PORT_REDIRECT: 1584 if (srp_target_is_topspin(target)) { 1585 /* 1586 * Topspin/Cisco SRP gateways incorrectly send 1587 * reject reason code 25 when they mean 24 1588 * (port redirect). 1589 */ 1590 memcpy(target->path.dgid.raw, 1591 event->param.rej_rcvd.ari, 16); 1592 1593 shost_printk(KERN_DEBUG, shost, 1594 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n", 1595 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix), 1596 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id)); 1597 1598 target->status = SRP_PORT_REDIRECT; 1599 } else { 1600 shost_printk(KERN_WARNING, shost, 1601 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n"); 1602 target->status = -ECONNRESET; 1603 } 1604 break; 1605 1606 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID: 1607 shost_printk(KERN_WARNING, shost, 1608 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n"); 1609 target->status = -ECONNRESET; 1610 break; 1611 1612 case IB_CM_REJ_CONSUMER_DEFINED: 1613 opcode = *(u8 *) event->private_data; 1614 if (opcode == SRP_LOGIN_REJ) { 1615 struct srp_login_rej *rej = event->private_data; 1616 u32 reason = be32_to_cpu(rej->reason); 1617 1618 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE) 1619 shost_printk(KERN_WARNING, shost, 1620 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n"); 1621 else 1622 shost_printk(KERN_WARNING, shost, 1623 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason); 1624 } else 1625 shost_printk(KERN_WARNING, shost, 1626 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED," 1627 " opcode 0x%02x\n", opcode); 1628 target->status = -ECONNRESET; 1629 break; 1630 1631 case IB_CM_REJ_STALE_CONN: 1632 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n"); 1633 target->status = SRP_STALE_CONN; 1634 break; 1635 1636 default: 1637 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n", 1638 event->param.rej_rcvd.reason); 1639 target->status = -ECONNRESET; 1640 } 1641 } 1642 1643 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 1644 { 1645 struct srp_target_port *target = cm_id->context; 1646 int comp = 0; 1647 1648 switch (event->event) { 1649 case IB_CM_REQ_ERROR: 1650 shost_printk(KERN_DEBUG, target->scsi_host, 1651 PFX "Sending CM REQ failed\n"); 1652 comp = 1; 1653 target->status = -ECONNRESET; 1654 break; 1655 1656 case IB_CM_REP_RECEIVED: 1657 comp = 1; 1658 srp_cm_rep_handler(cm_id, event->private_data, target); 1659 break; 1660 1661 case IB_CM_REJ_RECEIVED: 1662 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n"); 1663 comp = 1; 1664 1665 srp_cm_rej_handler(cm_id, event, target); 1666 break; 1667 1668 case IB_CM_DREQ_RECEIVED: 1669 shost_printk(KERN_WARNING, target->scsi_host, 1670 PFX "DREQ received - connection closed\n"); 1671 srp_change_conn_state(target, false); 1672 if (ib_send_cm_drep(cm_id, NULL, 0)) 1673 shost_printk(KERN_ERR, target->scsi_host, 1674 PFX "Sending CM DREP failed\n"); 1675 break; 1676 1677 case IB_CM_TIMEWAIT_EXIT: 1678 shost_printk(KERN_ERR, target->scsi_host, 1679 PFX "connection closed\n"); 1680 1681 target->status = 0; 1682 break; 1683 1684 case IB_CM_MRA_RECEIVED: 1685 case IB_CM_DREQ_ERROR: 1686 case IB_CM_DREP_RECEIVED: 1687 break; 1688 1689 default: 1690 shost_printk(KERN_WARNING, target->scsi_host, 1691 PFX "Unhandled CM event %d\n", event->event); 1692 break; 1693 } 1694 1695 if (comp) 1696 complete(&target->done); 1697 1698 return 0; 1699 } 1700 1701 static int srp_send_tsk_mgmt(struct srp_target_port *target, 1702 u64 req_tag, unsigned int lun, u8 func) 1703 { 1704 struct ib_device *dev = target->srp_host->srp_dev->dev; 1705 struct srp_iu *iu; 1706 struct srp_tsk_mgmt *tsk_mgmt; 1707 1708 if (!target->connected || target->qp_in_error) 1709 return -1; 1710 1711 init_completion(&target->tsk_mgmt_done); 1712 1713 spin_lock_irq(&target->lock); 1714 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT); 1715 spin_unlock_irq(&target->lock); 1716 1717 if (!iu) 1718 return -1; 1719 1720 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt, 1721 DMA_TO_DEVICE); 1722 tsk_mgmt = iu->buf; 1723 memset(tsk_mgmt, 0, sizeof *tsk_mgmt); 1724 1725 tsk_mgmt->opcode = SRP_TSK_MGMT; 1726 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48); 1727 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT; 1728 tsk_mgmt->tsk_mgmt_func = func; 1729 tsk_mgmt->task_tag = req_tag; 1730 1731 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt, 1732 DMA_TO_DEVICE); 1733 if (srp_post_send(target, iu, sizeof *tsk_mgmt)) { 1734 srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT); 1735 return -1; 1736 } 1737 1738 if (!wait_for_completion_timeout(&target->tsk_mgmt_done, 1739 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS))) 1740 return -1; 1741 1742 return 0; 1743 } 1744 1745 static int srp_abort(struct scsi_cmnd *scmnd) 1746 { 1747 struct srp_target_port *target = host_to_target(scmnd->device->host); 1748 struct srp_request *req = (struct srp_request *) scmnd->host_scribble; 1749 int ret; 1750 1751 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n"); 1752 1753 if (!req || !srp_claim_req(target, req, scmnd)) 1754 return FAILED; 1755 if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun, 1756 SRP_TSK_ABORT_TASK) == 0) 1757 ret = SUCCESS; 1758 else if (target->transport_offline) 1759 ret = FAST_IO_FAIL; 1760 else 1761 ret = FAILED; 1762 srp_free_req(target, req, scmnd, 0); 1763 scmnd->result = DID_ABORT << 16; 1764 scmnd->scsi_done(scmnd); 1765 1766 return ret; 1767 } 1768 1769 static int srp_reset_device(struct scsi_cmnd *scmnd) 1770 { 1771 struct srp_target_port *target = host_to_target(scmnd->device->host); 1772 int i; 1773 1774 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n"); 1775 1776 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun, 1777 SRP_TSK_LUN_RESET)) 1778 return FAILED; 1779 if (target->tsk_mgmt_status) 1780 return FAILED; 1781 1782 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) { 1783 struct srp_request *req = &target->req_ring[i]; 1784 if (req->scmnd && req->scmnd->device == scmnd->device) 1785 srp_reset_req(target, req); 1786 } 1787 1788 return SUCCESS; 1789 } 1790 1791 static int srp_reset_host(struct scsi_cmnd *scmnd) 1792 { 1793 struct srp_target_port *target = host_to_target(scmnd->device->host); 1794 int ret = FAILED; 1795 1796 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n"); 1797 1798 if (!srp_reconnect_target(target)) 1799 ret = SUCCESS; 1800 1801 return ret; 1802 } 1803 1804 static int srp_slave_configure(struct scsi_device *sdev) 1805 { 1806 struct Scsi_Host *shost = sdev->host; 1807 struct srp_target_port *target = host_to_target(shost); 1808 struct request_queue *q = sdev->request_queue; 1809 unsigned long timeout; 1810 1811 if (sdev->type == TYPE_DISK) { 1812 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies); 1813 blk_queue_rq_timeout(q, timeout); 1814 } 1815 1816 return 0; 1817 } 1818 1819 static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr, 1820 char *buf) 1821 { 1822 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 1823 1824 return sprintf(buf, "0x%016llx\n", 1825 (unsigned long long) be64_to_cpu(target->id_ext)); 1826 } 1827 1828 static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr, 1829 char *buf) 1830 { 1831 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 1832 1833 return sprintf(buf, "0x%016llx\n", 1834 (unsigned long long) be64_to_cpu(target->ioc_guid)); 1835 } 1836 1837 static ssize_t show_service_id(struct device *dev, 1838 struct device_attribute *attr, char *buf) 1839 { 1840 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 1841 1842 return sprintf(buf, "0x%016llx\n", 1843 (unsigned long long) be64_to_cpu(target->service_id)); 1844 } 1845 1846 static ssize_t show_pkey(struct device *dev, struct device_attribute *attr, 1847 char *buf) 1848 { 1849 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 1850 1851 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey)); 1852 } 1853 1854 static ssize_t show_dgid(struct device *dev, struct device_attribute *attr, 1855 char *buf) 1856 { 1857 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 1858 1859 return sprintf(buf, "%pI6\n", target->path.dgid.raw); 1860 } 1861 1862 static ssize_t show_orig_dgid(struct device *dev, 1863 struct device_attribute *attr, char *buf) 1864 { 1865 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 1866 1867 return sprintf(buf, "%pI6\n", target->orig_dgid); 1868 } 1869 1870 static ssize_t show_req_lim(struct device *dev, 1871 struct device_attribute *attr, char *buf) 1872 { 1873 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 1874 1875 return sprintf(buf, "%d\n", target->req_lim); 1876 } 1877 1878 static ssize_t show_zero_req_lim(struct device *dev, 1879 struct device_attribute *attr, char *buf) 1880 { 1881 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 1882 1883 return sprintf(buf, "%d\n", target->zero_req_lim); 1884 } 1885 1886 static ssize_t show_local_ib_port(struct device *dev, 1887 struct device_attribute *attr, char *buf) 1888 { 1889 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 1890 1891 return sprintf(buf, "%d\n", target->srp_host->port); 1892 } 1893 1894 static ssize_t show_local_ib_device(struct device *dev, 1895 struct device_attribute *attr, char *buf) 1896 { 1897 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 1898 1899 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name); 1900 } 1901 1902 static ssize_t show_comp_vector(struct device *dev, 1903 struct device_attribute *attr, char *buf) 1904 { 1905 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 1906 1907 return sprintf(buf, "%d\n", target->comp_vector); 1908 } 1909 1910 static ssize_t show_cmd_sg_entries(struct device *dev, 1911 struct device_attribute *attr, char *buf) 1912 { 1913 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 1914 1915 return sprintf(buf, "%u\n", target->cmd_sg_cnt); 1916 } 1917 1918 static ssize_t show_allow_ext_sg(struct device *dev, 1919 struct device_attribute *attr, char *buf) 1920 { 1921 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 1922 1923 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false"); 1924 } 1925 1926 static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL); 1927 static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL); 1928 static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL); 1929 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); 1930 static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL); 1931 static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL); 1932 static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL); 1933 static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL); 1934 static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL); 1935 static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL); 1936 static DEVICE_ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL); 1937 static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL); 1938 static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL); 1939 1940 static struct device_attribute *srp_host_attrs[] = { 1941 &dev_attr_id_ext, 1942 &dev_attr_ioc_guid, 1943 &dev_attr_service_id, 1944 &dev_attr_pkey, 1945 &dev_attr_dgid, 1946 &dev_attr_orig_dgid, 1947 &dev_attr_req_lim, 1948 &dev_attr_zero_req_lim, 1949 &dev_attr_local_ib_port, 1950 &dev_attr_local_ib_device, 1951 &dev_attr_comp_vector, 1952 &dev_attr_cmd_sg_entries, 1953 &dev_attr_allow_ext_sg, 1954 NULL 1955 }; 1956 1957 static struct scsi_host_template srp_template = { 1958 .module = THIS_MODULE, 1959 .name = "InfiniBand SRP initiator", 1960 .proc_name = DRV_NAME, 1961 .slave_configure = srp_slave_configure, 1962 .info = srp_target_info, 1963 .queuecommand = srp_queuecommand, 1964 .eh_abort_handler = srp_abort, 1965 .eh_device_reset_handler = srp_reset_device, 1966 .eh_host_reset_handler = srp_reset_host, 1967 .skip_settle_delay = true, 1968 .sg_tablesize = SRP_DEF_SG_TABLESIZE, 1969 .can_queue = SRP_CMD_SQ_SIZE, 1970 .this_id = -1, 1971 .cmd_per_lun = SRP_CMD_SQ_SIZE, 1972 .use_clustering = ENABLE_CLUSTERING, 1973 .shost_attrs = srp_host_attrs 1974 }; 1975 1976 static int srp_add_target(struct srp_host *host, struct srp_target_port *target) 1977 { 1978 struct srp_rport_identifiers ids; 1979 struct srp_rport *rport; 1980 1981 sprintf(target->target_name, "SRP.T10:%016llX", 1982 (unsigned long long) be64_to_cpu(target->id_ext)); 1983 1984 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device)) 1985 return -ENODEV; 1986 1987 memcpy(ids.port_id, &target->id_ext, 8); 1988 memcpy(ids.port_id + 8, &target->ioc_guid, 8); 1989 ids.roles = SRP_RPORT_ROLE_TARGET; 1990 rport = srp_rport_add(target->scsi_host, &ids); 1991 if (IS_ERR(rport)) { 1992 scsi_remove_host(target->scsi_host); 1993 return PTR_ERR(rport); 1994 } 1995 1996 rport->lld_data = target; 1997 1998 spin_lock(&host->target_lock); 1999 list_add_tail(&target->list, &host->target_list); 2000 spin_unlock(&host->target_lock); 2001 2002 target->state = SRP_TARGET_LIVE; 2003 2004 scsi_scan_target(&target->scsi_host->shost_gendev, 2005 0, target->scsi_id, SCAN_WILD_CARD, 0); 2006 2007 return 0; 2008 } 2009 2010 static void srp_release_dev(struct device *dev) 2011 { 2012 struct srp_host *host = 2013 container_of(dev, struct srp_host, dev); 2014 2015 complete(&host->released); 2016 } 2017 2018 static struct class srp_class = { 2019 .name = "infiniband_srp", 2020 .dev_release = srp_release_dev 2021 }; 2022 2023 /** 2024 * srp_conn_unique() - check whether the connection to a target is unique 2025 */ 2026 static bool srp_conn_unique(struct srp_host *host, 2027 struct srp_target_port *target) 2028 { 2029 struct srp_target_port *t; 2030 bool ret = false; 2031 2032 if (target->state == SRP_TARGET_REMOVED) 2033 goto out; 2034 2035 ret = true; 2036 2037 spin_lock(&host->target_lock); 2038 list_for_each_entry(t, &host->target_list, list) { 2039 if (t != target && 2040 target->id_ext == t->id_ext && 2041 target->ioc_guid == t->ioc_guid && 2042 target->initiator_ext == t->initiator_ext) { 2043 ret = false; 2044 break; 2045 } 2046 } 2047 spin_unlock(&host->target_lock); 2048 2049 out: 2050 return ret; 2051 } 2052 2053 /* 2054 * Target ports are added by writing 2055 * 2056 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>, 2057 * pkey=<P_Key>,service_id=<service ID> 2058 * 2059 * to the add_target sysfs attribute. 2060 */ 2061 enum { 2062 SRP_OPT_ERR = 0, 2063 SRP_OPT_ID_EXT = 1 << 0, 2064 SRP_OPT_IOC_GUID = 1 << 1, 2065 SRP_OPT_DGID = 1 << 2, 2066 SRP_OPT_PKEY = 1 << 3, 2067 SRP_OPT_SERVICE_ID = 1 << 4, 2068 SRP_OPT_MAX_SECT = 1 << 5, 2069 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6, 2070 SRP_OPT_IO_CLASS = 1 << 7, 2071 SRP_OPT_INITIATOR_EXT = 1 << 8, 2072 SRP_OPT_CMD_SG_ENTRIES = 1 << 9, 2073 SRP_OPT_ALLOW_EXT_SG = 1 << 10, 2074 SRP_OPT_SG_TABLESIZE = 1 << 11, 2075 SRP_OPT_COMP_VECTOR = 1 << 12, 2076 SRP_OPT_ALL = (SRP_OPT_ID_EXT | 2077 SRP_OPT_IOC_GUID | 2078 SRP_OPT_DGID | 2079 SRP_OPT_PKEY | 2080 SRP_OPT_SERVICE_ID), 2081 }; 2082 2083 static const match_table_t srp_opt_tokens = { 2084 { SRP_OPT_ID_EXT, "id_ext=%s" }, 2085 { SRP_OPT_IOC_GUID, "ioc_guid=%s" }, 2086 { SRP_OPT_DGID, "dgid=%s" }, 2087 { SRP_OPT_PKEY, "pkey=%x" }, 2088 { SRP_OPT_SERVICE_ID, "service_id=%s" }, 2089 { SRP_OPT_MAX_SECT, "max_sect=%d" }, 2090 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" }, 2091 { SRP_OPT_IO_CLASS, "io_class=%x" }, 2092 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" }, 2093 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" }, 2094 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" }, 2095 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" }, 2096 { SRP_OPT_COMP_VECTOR, "comp_vector=%u" }, 2097 { SRP_OPT_ERR, NULL } 2098 }; 2099 2100 static int srp_parse_options(const char *buf, struct srp_target_port *target) 2101 { 2102 char *options, *sep_opt; 2103 char *p; 2104 char dgid[3]; 2105 substring_t args[MAX_OPT_ARGS]; 2106 int opt_mask = 0; 2107 int token; 2108 int ret = -EINVAL; 2109 int i; 2110 2111 options = kstrdup(buf, GFP_KERNEL); 2112 if (!options) 2113 return -ENOMEM; 2114 2115 sep_opt = options; 2116 while ((p = strsep(&sep_opt, ",")) != NULL) { 2117 if (!*p) 2118 continue; 2119 2120 token = match_token(p, srp_opt_tokens, args); 2121 opt_mask |= token; 2122 2123 switch (token) { 2124 case SRP_OPT_ID_EXT: 2125 p = match_strdup(args); 2126 if (!p) { 2127 ret = -ENOMEM; 2128 goto out; 2129 } 2130 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); 2131 kfree(p); 2132 break; 2133 2134 case SRP_OPT_IOC_GUID: 2135 p = match_strdup(args); 2136 if (!p) { 2137 ret = -ENOMEM; 2138 goto out; 2139 } 2140 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16)); 2141 kfree(p); 2142 break; 2143 2144 case SRP_OPT_DGID: 2145 p = match_strdup(args); 2146 if (!p) { 2147 ret = -ENOMEM; 2148 goto out; 2149 } 2150 if (strlen(p) != 32) { 2151 pr_warn("bad dest GID parameter '%s'\n", p); 2152 kfree(p); 2153 goto out; 2154 } 2155 2156 for (i = 0; i < 16; ++i) { 2157 strlcpy(dgid, p + i * 2, 3); 2158 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16); 2159 } 2160 kfree(p); 2161 memcpy(target->orig_dgid, target->path.dgid.raw, 16); 2162 break; 2163 2164 case SRP_OPT_PKEY: 2165 if (match_hex(args, &token)) { 2166 pr_warn("bad P_Key parameter '%s'\n", p); 2167 goto out; 2168 } 2169 target->path.pkey = cpu_to_be16(token); 2170 break; 2171 2172 case SRP_OPT_SERVICE_ID: 2173 p = match_strdup(args); 2174 if (!p) { 2175 ret = -ENOMEM; 2176 goto out; 2177 } 2178 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16)); 2179 target->path.service_id = target->service_id; 2180 kfree(p); 2181 break; 2182 2183 case SRP_OPT_MAX_SECT: 2184 if (match_int(args, &token)) { 2185 pr_warn("bad max sect parameter '%s'\n", p); 2186 goto out; 2187 } 2188 target->scsi_host->max_sectors = token; 2189 break; 2190 2191 case SRP_OPT_MAX_CMD_PER_LUN: 2192 if (match_int(args, &token)) { 2193 pr_warn("bad max cmd_per_lun parameter '%s'\n", 2194 p); 2195 goto out; 2196 } 2197 target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE); 2198 break; 2199 2200 case SRP_OPT_IO_CLASS: 2201 if (match_hex(args, &token)) { 2202 pr_warn("bad IO class parameter '%s'\n", p); 2203 goto out; 2204 } 2205 if (token != SRP_REV10_IB_IO_CLASS && 2206 token != SRP_REV16A_IB_IO_CLASS) { 2207 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n", 2208 token, SRP_REV10_IB_IO_CLASS, 2209 SRP_REV16A_IB_IO_CLASS); 2210 goto out; 2211 } 2212 target->io_class = token; 2213 break; 2214 2215 case SRP_OPT_INITIATOR_EXT: 2216 p = match_strdup(args); 2217 if (!p) { 2218 ret = -ENOMEM; 2219 goto out; 2220 } 2221 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); 2222 kfree(p); 2223 break; 2224 2225 case SRP_OPT_CMD_SG_ENTRIES: 2226 if (match_int(args, &token) || token < 1 || token > 255) { 2227 pr_warn("bad max cmd_sg_entries parameter '%s'\n", 2228 p); 2229 goto out; 2230 } 2231 target->cmd_sg_cnt = token; 2232 break; 2233 2234 case SRP_OPT_ALLOW_EXT_SG: 2235 if (match_int(args, &token)) { 2236 pr_warn("bad allow_ext_sg parameter '%s'\n", p); 2237 goto out; 2238 } 2239 target->allow_ext_sg = !!token; 2240 break; 2241 2242 case SRP_OPT_SG_TABLESIZE: 2243 if (match_int(args, &token) || token < 1 || 2244 token > SCSI_MAX_SG_CHAIN_SEGMENTS) { 2245 pr_warn("bad max sg_tablesize parameter '%s'\n", 2246 p); 2247 goto out; 2248 } 2249 target->sg_tablesize = token; 2250 break; 2251 2252 case SRP_OPT_COMP_VECTOR: 2253 if (match_int(args, &token) || token < 0) { 2254 pr_warn("bad comp_vector parameter '%s'\n", p); 2255 goto out; 2256 } 2257 target->comp_vector = token; 2258 break; 2259 2260 default: 2261 pr_warn("unknown parameter or missing value '%s' in target creation request\n", 2262 p); 2263 goto out; 2264 } 2265 } 2266 2267 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL) 2268 ret = 0; 2269 else 2270 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i) 2271 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) && 2272 !(srp_opt_tokens[i].token & opt_mask)) 2273 pr_warn("target creation request is missing parameter '%s'\n", 2274 srp_opt_tokens[i].pattern); 2275 2276 out: 2277 kfree(options); 2278 return ret; 2279 } 2280 2281 static ssize_t srp_create_target(struct device *dev, 2282 struct device_attribute *attr, 2283 const char *buf, size_t count) 2284 { 2285 struct srp_host *host = 2286 container_of(dev, struct srp_host, dev); 2287 struct Scsi_Host *target_host; 2288 struct srp_target_port *target; 2289 struct ib_device *ibdev = host->srp_dev->dev; 2290 dma_addr_t dma_addr; 2291 int i, ret; 2292 2293 target_host = scsi_host_alloc(&srp_template, 2294 sizeof (struct srp_target_port)); 2295 if (!target_host) 2296 return -ENOMEM; 2297 2298 target_host->transportt = ib_srp_transport_template; 2299 target_host->max_channel = 0; 2300 target_host->max_id = 1; 2301 target_host->max_lun = SRP_MAX_LUN; 2302 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb; 2303 2304 target = host_to_target(target_host); 2305 2306 target->io_class = SRP_REV16A_IB_IO_CLASS; 2307 target->scsi_host = target_host; 2308 target->srp_host = host; 2309 target->lkey = host->srp_dev->mr->lkey; 2310 target->rkey = host->srp_dev->mr->rkey; 2311 target->cmd_sg_cnt = cmd_sg_entries; 2312 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries; 2313 target->allow_ext_sg = allow_ext_sg; 2314 2315 ret = srp_parse_options(buf, target); 2316 if (ret) 2317 goto err; 2318 2319 if (!srp_conn_unique(target->srp_host, target)) { 2320 shost_printk(KERN_INFO, target->scsi_host, 2321 PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n", 2322 be64_to_cpu(target->id_ext), 2323 be64_to_cpu(target->ioc_guid), 2324 be64_to_cpu(target->initiator_ext)); 2325 ret = -EEXIST; 2326 goto err; 2327 } 2328 2329 if (!host->srp_dev->fmr_pool && !target->allow_ext_sg && 2330 target->cmd_sg_cnt < target->sg_tablesize) { 2331 pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n"); 2332 target->sg_tablesize = target->cmd_sg_cnt; 2333 } 2334 2335 target_host->sg_tablesize = target->sg_tablesize; 2336 target->indirect_size = target->sg_tablesize * 2337 sizeof (struct srp_direct_buf); 2338 target->max_iu_len = sizeof (struct srp_cmd) + 2339 sizeof (struct srp_indirect_buf) + 2340 target->cmd_sg_cnt * sizeof (struct srp_direct_buf); 2341 2342 INIT_WORK(&target->remove_work, srp_remove_work); 2343 spin_lock_init(&target->lock); 2344 INIT_LIST_HEAD(&target->free_tx); 2345 INIT_LIST_HEAD(&target->free_reqs); 2346 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) { 2347 struct srp_request *req = &target->req_ring[i]; 2348 2349 req->fmr_list = kmalloc(target->cmd_sg_cnt * sizeof (void *), 2350 GFP_KERNEL); 2351 req->map_page = kmalloc(SRP_FMR_SIZE * sizeof (void *), 2352 GFP_KERNEL); 2353 req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL); 2354 if (!req->fmr_list || !req->map_page || !req->indirect_desc) 2355 goto err_free_mem; 2356 2357 dma_addr = ib_dma_map_single(ibdev, req->indirect_desc, 2358 target->indirect_size, 2359 DMA_TO_DEVICE); 2360 if (ib_dma_mapping_error(ibdev, dma_addr)) 2361 goto err_free_mem; 2362 2363 req->indirect_dma_addr = dma_addr; 2364 req->index = i; 2365 list_add_tail(&req->list, &target->free_reqs); 2366 } 2367 2368 ib_query_gid(ibdev, host->port, 0, &target->path.sgid); 2369 2370 shost_printk(KERN_DEBUG, target->scsi_host, PFX 2371 "new target: id_ext %016llx ioc_guid %016llx pkey %04x " 2372 "service_id %016llx dgid %pI6\n", 2373 (unsigned long long) be64_to_cpu(target->id_ext), 2374 (unsigned long long) be64_to_cpu(target->ioc_guid), 2375 be16_to_cpu(target->path.pkey), 2376 (unsigned long long) be64_to_cpu(target->service_id), 2377 target->path.dgid.raw); 2378 2379 ret = srp_create_target_ib(target); 2380 if (ret) 2381 goto err_free_mem; 2382 2383 ret = srp_new_cm_id(target); 2384 if (ret) 2385 goto err_free_ib; 2386 2387 ret = srp_connect_target(target); 2388 if (ret) { 2389 shost_printk(KERN_ERR, target->scsi_host, 2390 PFX "Connection failed\n"); 2391 goto err_cm_id; 2392 } 2393 2394 ret = srp_add_target(host, target); 2395 if (ret) 2396 goto err_disconnect; 2397 2398 return count; 2399 2400 err_disconnect: 2401 srp_disconnect_target(target); 2402 2403 err_cm_id: 2404 ib_destroy_cm_id(target->cm_id); 2405 2406 err_free_ib: 2407 srp_free_target_ib(target); 2408 2409 err_free_mem: 2410 srp_free_req_data(target); 2411 2412 err: 2413 scsi_host_put(target_host); 2414 2415 return ret; 2416 } 2417 2418 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target); 2419 2420 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr, 2421 char *buf) 2422 { 2423 struct srp_host *host = container_of(dev, struct srp_host, dev); 2424 2425 return sprintf(buf, "%s\n", host->srp_dev->dev->name); 2426 } 2427 2428 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 2429 2430 static ssize_t show_port(struct device *dev, struct device_attribute *attr, 2431 char *buf) 2432 { 2433 struct srp_host *host = container_of(dev, struct srp_host, dev); 2434 2435 return sprintf(buf, "%d\n", host->port); 2436 } 2437 2438 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL); 2439 2440 static struct srp_host *srp_add_port(struct srp_device *device, u8 port) 2441 { 2442 struct srp_host *host; 2443 2444 host = kzalloc(sizeof *host, GFP_KERNEL); 2445 if (!host) 2446 return NULL; 2447 2448 INIT_LIST_HEAD(&host->target_list); 2449 spin_lock_init(&host->target_lock); 2450 init_completion(&host->released); 2451 host->srp_dev = device; 2452 host->port = port; 2453 2454 host->dev.class = &srp_class; 2455 host->dev.parent = device->dev->dma_device; 2456 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port); 2457 2458 if (device_register(&host->dev)) 2459 goto free_host; 2460 if (device_create_file(&host->dev, &dev_attr_add_target)) 2461 goto err_class; 2462 if (device_create_file(&host->dev, &dev_attr_ibdev)) 2463 goto err_class; 2464 if (device_create_file(&host->dev, &dev_attr_port)) 2465 goto err_class; 2466 2467 return host; 2468 2469 err_class: 2470 device_unregister(&host->dev); 2471 2472 free_host: 2473 kfree(host); 2474 2475 return NULL; 2476 } 2477 2478 static void srp_add_one(struct ib_device *device) 2479 { 2480 struct srp_device *srp_dev; 2481 struct ib_device_attr *dev_attr; 2482 struct ib_fmr_pool_param fmr_param; 2483 struct srp_host *host; 2484 int max_pages_per_fmr, fmr_page_shift, s, e, p; 2485 2486 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL); 2487 if (!dev_attr) 2488 return; 2489 2490 if (ib_query_device(device, dev_attr)) { 2491 pr_warn("Query device failed for %s\n", device->name); 2492 goto free_attr; 2493 } 2494 2495 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL); 2496 if (!srp_dev) 2497 goto free_attr; 2498 2499 /* 2500 * Use the smallest page size supported by the HCA, down to a 2501 * minimum of 4096 bytes. We're unlikely to build large sglists 2502 * out of smaller entries. 2503 */ 2504 fmr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1); 2505 srp_dev->fmr_page_size = 1 << fmr_page_shift; 2506 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1); 2507 srp_dev->fmr_max_size = srp_dev->fmr_page_size * SRP_FMR_SIZE; 2508 2509 INIT_LIST_HEAD(&srp_dev->dev_list); 2510 2511 srp_dev->dev = device; 2512 srp_dev->pd = ib_alloc_pd(device); 2513 if (IS_ERR(srp_dev->pd)) 2514 goto free_dev; 2515 2516 srp_dev->mr = ib_get_dma_mr(srp_dev->pd, 2517 IB_ACCESS_LOCAL_WRITE | 2518 IB_ACCESS_REMOTE_READ | 2519 IB_ACCESS_REMOTE_WRITE); 2520 if (IS_ERR(srp_dev->mr)) 2521 goto err_pd; 2522 2523 for (max_pages_per_fmr = SRP_FMR_SIZE; 2524 max_pages_per_fmr >= SRP_FMR_MIN_SIZE; 2525 max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) { 2526 memset(&fmr_param, 0, sizeof fmr_param); 2527 fmr_param.pool_size = SRP_FMR_POOL_SIZE; 2528 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE; 2529 fmr_param.cache = 1; 2530 fmr_param.max_pages_per_fmr = max_pages_per_fmr; 2531 fmr_param.page_shift = fmr_page_shift; 2532 fmr_param.access = (IB_ACCESS_LOCAL_WRITE | 2533 IB_ACCESS_REMOTE_WRITE | 2534 IB_ACCESS_REMOTE_READ); 2535 2536 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param); 2537 if (!IS_ERR(srp_dev->fmr_pool)) 2538 break; 2539 } 2540 2541 if (IS_ERR(srp_dev->fmr_pool)) 2542 srp_dev->fmr_pool = NULL; 2543 2544 if (device->node_type == RDMA_NODE_IB_SWITCH) { 2545 s = 0; 2546 e = 0; 2547 } else { 2548 s = 1; 2549 e = device->phys_port_cnt; 2550 } 2551 2552 for (p = s; p <= e; ++p) { 2553 host = srp_add_port(srp_dev, p); 2554 if (host) 2555 list_add_tail(&host->list, &srp_dev->dev_list); 2556 } 2557 2558 ib_set_client_data(device, &srp_client, srp_dev); 2559 2560 goto free_attr; 2561 2562 err_pd: 2563 ib_dealloc_pd(srp_dev->pd); 2564 2565 free_dev: 2566 kfree(srp_dev); 2567 2568 free_attr: 2569 kfree(dev_attr); 2570 } 2571 2572 static void srp_remove_one(struct ib_device *device) 2573 { 2574 struct srp_device *srp_dev; 2575 struct srp_host *host, *tmp_host; 2576 struct srp_target_port *target; 2577 2578 srp_dev = ib_get_client_data(device, &srp_client); 2579 if (!srp_dev) 2580 return; 2581 2582 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) { 2583 device_unregister(&host->dev); 2584 /* 2585 * Wait for the sysfs entry to go away, so that no new 2586 * target ports can be created. 2587 */ 2588 wait_for_completion(&host->released); 2589 2590 /* 2591 * Remove all target ports. 2592 */ 2593 spin_lock(&host->target_lock); 2594 list_for_each_entry(target, &host->target_list, list) 2595 srp_queue_remove_work(target); 2596 spin_unlock(&host->target_lock); 2597 2598 /* 2599 * Wait for target port removal tasks. 2600 */ 2601 flush_workqueue(system_long_wq); 2602 2603 kfree(host); 2604 } 2605 2606 if (srp_dev->fmr_pool) 2607 ib_destroy_fmr_pool(srp_dev->fmr_pool); 2608 ib_dereg_mr(srp_dev->mr); 2609 ib_dealloc_pd(srp_dev->pd); 2610 2611 kfree(srp_dev); 2612 } 2613 2614 static struct srp_function_template ib_srp_transport_functions = { 2615 .rport_delete = srp_rport_delete, 2616 }; 2617 2618 static int __init srp_init_module(void) 2619 { 2620 int ret; 2621 2622 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *)); 2623 2624 if (srp_sg_tablesize) { 2625 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n"); 2626 if (!cmd_sg_entries) 2627 cmd_sg_entries = srp_sg_tablesize; 2628 } 2629 2630 if (!cmd_sg_entries) 2631 cmd_sg_entries = SRP_DEF_SG_TABLESIZE; 2632 2633 if (cmd_sg_entries > 255) { 2634 pr_warn("Clamping cmd_sg_entries to 255\n"); 2635 cmd_sg_entries = 255; 2636 } 2637 2638 if (!indirect_sg_entries) 2639 indirect_sg_entries = cmd_sg_entries; 2640 else if (indirect_sg_entries < cmd_sg_entries) { 2641 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n", 2642 cmd_sg_entries); 2643 indirect_sg_entries = cmd_sg_entries; 2644 } 2645 2646 ib_srp_transport_template = 2647 srp_attach_transport(&ib_srp_transport_functions); 2648 if (!ib_srp_transport_template) 2649 return -ENOMEM; 2650 2651 ret = class_register(&srp_class); 2652 if (ret) { 2653 pr_err("couldn't register class infiniband_srp\n"); 2654 srp_release_transport(ib_srp_transport_template); 2655 return ret; 2656 } 2657 2658 ib_sa_register_client(&srp_sa_client); 2659 2660 ret = ib_register_client(&srp_client); 2661 if (ret) { 2662 pr_err("couldn't register IB client\n"); 2663 srp_release_transport(ib_srp_transport_template); 2664 ib_sa_unregister_client(&srp_sa_client); 2665 class_unregister(&srp_class); 2666 return ret; 2667 } 2668 2669 return 0; 2670 } 2671 2672 static void __exit srp_cleanup_module(void) 2673 { 2674 ib_unregister_client(&srp_client); 2675 ib_sa_unregister_client(&srp_sa_client); 2676 class_unregister(&srp_class); 2677 srp_release_transport(ib_srp_transport_template); 2678 } 2679 2680 module_init(srp_init_module); 2681 module_exit(srp_cleanup_module); 2682