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 * $Id: ib_srp.c 3932 2005-11-01 17:19:29Z roland $ 33 */ 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 <asm/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 51 #include <rdma/ib_cache.h> 52 53 #include "ib_srp.h" 54 55 #define DRV_NAME "ib_srp" 56 #define PFX DRV_NAME ": " 57 #define DRV_VERSION "0.2" 58 #define DRV_RELDATE "November 1, 2005" 59 60 MODULE_AUTHOR("Roland Dreier"); 61 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator " 62 "v" DRV_VERSION " (" DRV_RELDATE ")"); 63 MODULE_LICENSE("Dual BSD/GPL"); 64 65 static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE; 66 static int srp_max_iu_len; 67 68 module_param(srp_sg_tablesize, int, 0444); 69 MODULE_PARM_DESC(srp_sg_tablesize, 70 "Max number of gather/scatter entries per I/O (default is 12)"); 71 72 static int topspin_workarounds = 1; 73 74 module_param(topspin_workarounds, int, 0444); 75 MODULE_PARM_DESC(topspin_workarounds, 76 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0"); 77 78 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad }; 79 80 static int mellanox_workarounds = 1; 81 82 module_param(mellanox_workarounds, int, 0444); 83 MODULE_PARM_DESC(mellanox_workarounds, 84 "Enable workarounds for Mellanox SRP target bugs if != 0"); 85 86 static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 }; 87 88 static void srp_add_one(struct ib_device *device); 89 static void srp_remove_one(struct ib_device *device); 90 static void srp_completion(struct ib_cq *cq, void *target_ptr); 91 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event); 92 93 static struct ib_client srp_client = { 94 .name = "srp", 95 .add = srp_add_one, 96 .remove = srp_remove_one 97 }; 98 99 static struct ib_sa_client srp_sa_client; 100 101 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host) 102 { 103 return (struct srp_target_port *) host->hostdata; 104 } 105 106 static const char *srp_target_info(struct Scsi_Host *host) 107 { 108 return host_to_target(host)->target_name; 109 } 110 111 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size, 112 gfp_t gfp_mask, 113 enum dma_data_direction direction) 114 { 115 struct srp_iu *iu; 116 117 iu = kmalloc(sizeof *iu, gfp_mask); 118 if (!iu) 119 goto out; 120 121 iu->buf = kzalloc(size, gfp_mask); 122 if (!iu->buf) 123 goto out_free_iu; 124 125 iu->dma = ib_dma_map_single(host->dev->dev, iu->buf, size, direction); 126 if (ib_dma_mapping_error(host->dev->dev, iu->dma)) 127 goto out_free_buf; 128 129 iu->size = size; 130 iu->direction = direction; 131 132 return iu; 133 134 out_free_buf: 135 kfree(iu->buf); 136 out_free_iu: 137 kfree(iu); 138 out: 139 return NULL; 140 } 141 142 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu) 143 { 144 if (!iu) 145 return; 146 147 ib_dma_unmap_single(host->dev->dev, iu->dma, iu->size, iu->direction); 148 kfree(iu->buf); 149 kfree(iu); 150 } 151 152 static void srp_qp_event(struct ib_event *event, void *context) 153 { 154 printk(KERN_ERR PFX "QP event %d\n", event->event); 155 } 156 157 static int srp_init_qp(struct srp_target_port *target, 158 struct ib_qp *qp) 159 { 160 struct ib_qp_attr *attr; 161 int ret; 162 163 attr = kmalloc(sizeof *attr, GFP_KERNEL); 164 if (!attr) 165 return -ENOMEM; 166 167 ret = ib_find_cached_pkey(target->srp_host->dev->dev, 168 target->srp_host->port, 169 be16_to_cpu(target->path.pkey), 170 &attr->pkey_index); 171 if (ret) 172 goto out; 173 174 attr->qp_state = IB_QPS_INIT; 175 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ | 176 IB_ACCESS_REMOTE_WRITE); 177 attr->port_num = target->srp_host->port; 178 179 ret = ib_modify_qp(qp, attr, 180 IB_QP_STATE | 181 IB_QP_PKEY_INDEX | 182 IB_QP_ACCESS_FLAGS | 183 IB_QP_PORT); 184 185 out: 186 kfree(attr); 187 return ret; 188 } 189 190 static int srp_create_target_ib(struct srp_target_port *target) 191 { 192 struct ib_qp_init_attr *init_attr; 193 int ret; 194 195 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL); 196 if (!init_attr) 197 return -ENOMEM; 198 199 target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion, 200 NULL, target, SRP_CQ_SIZE); 201 if (IS_ERR(target->cq)) { 202 ret = PTR_ERR(target->cq); 203 goto out; 204 } 205 206 ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP); 207 208 init_attr->event_handler = srp_qp_event; 209 init_attr->cap.max_send_wr = SRP_SQ_SIZE; 210 init_attr->cap.max_recv_wr = SRP_RQ_SIZE; 211 init_attr->cap.max_recv_sge = 1; 212 init_attr->cap.max_send_sge = 1; 213 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR; 214 init_attr->qp_type = IB_QPT_RC; 215 init_attr->send_cq = target->cq; 216 init_attr->recv_cq = target->cq; 217 218 target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr); 219 if (IS_ERR(target->qp)) { 220 ret = PTR_ERR(target->qp); 221 ib_destroy_cq(target->cq); 222 goto out; 223 } 224 225 ret = srp_init_qp(target, target->qp); 226 if (ret) { 227 ib_destroy_qp(target->qp); 228 ib_destroy_cq(target->cq); 229 goto out; 230 } 231 232 out: 233 kfree(init_attr); 234 return ret; 235 } 236 237 static void srp_free_target_ib(struct srp_target_port *target) 238 { 239 int i; 240 241 ib_destroy_qp(target->qp); 242 ib_destroy_cq(target->cq); 243 244 for (i = 0; i < SRP_RQ_SIZE; ++i) 245 srp_free_iu(target->srp_host, target->rx_ring[i]); 246 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) 247 srp_free_iu(target->srp_host, target->tx_ring[i]); 248 } 249 250 static void srp_path_rec_completion(int status, 251 struct ib_sa_path_rec *pathrec, 252 void *target_ptr) 253 { 254 struct srp_target_port *target = target_ptr; 255 256 target->status = status; 257 if (status) 258 printk(KERN_ERR PFX "Got failed path rec status %d\n", status); 259 else 260 target->path = *pathrec; 261 complete(&target->done); 262 } 263 264 static int srp_lookup_path(struct srp_target_port *target) 265 { 266 target->path.numb_path = 1; 267 268 init_completion(&target->done); 269 270 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client, 271 target->srp_host->dev->dev, 272 target->srp_host->port, 273 &target->path, 274 IB_SA_PATH_REC_DGID | 275 IB_SA_PATH_REC_SGID | 276 IB_SA_PATH_REC_NUMB_PATH | 277 IB_SA_PATH_REC_PKEY, 278 SRP_PATH_REC_TIMEOUT_MS, 279 GFP_KERNEL, 280 srp_path_rec_completion, 281 target, &target->path_query); 282 if (target->path_query_id < 0) 283 return target->path_query_id; 284 285 wait_for_completion(&target->done); 286 287 if (target->status < 0) 288 printk(KERN_WARNING PFX "Path record query failed\n"); 289 290 return target->status; 291 } 292 293 static int srp_send_req(struct srp_target_port *target) 294 { 295 struct { 296 struct ib_cm_req_param param; 297 struct srp_login_req priv; 298 } *req = NULL; 299 int status; 300 301 req = kzalloc(sizeof *req, GFP_KERNEL); 302 if (!req) 303 return -ENOMEM; 304 305 req->param.primary_path = &target->path; 306 req->param.alternate_path = NULL; 307 req->param.service_id = target->service_id; 308 req->param.qp_num = target->qp->qp_num; 309 req->param.qp_type = target->qp->qp_type; 310 req->param.private_data = &req->priv; 311 req->param.private_data_len = sizeof req->priv; 312 req->param.flow_control = 1; 313 314 get_random_bytes(&req->param.starting_psn, 4); 315 req->param.starting_psn &= 0xffffff; 316 317 /* 318 * Pick some arbitrary defaults here; we could make these 319 * module parameters if anyone cared about setting them. 320 */ 321 req->param.responder_resources = 4; 322 req->param.remote_cm_response_timeout = 20; 323 req->param.local_cm_response_timeout = 20; 324 req->param.retry_count = 7; 325 req->param.rnr_retry_count = 7; 326 req->param.max_cm_retries = 15; 327 328 req->priv.opcode = SRP_LOGIN_REQ; 329 req->priv.tag = 0; 330 req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len); 331 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | 332 SRP_BUF_FORMAT_INDIRECT); 333 /* 334 * In the published SRP specification (draft rev. 16a), the 335 * port identifier format is 8 bytes of ID extension followed 336 * by 8 bytes of GUID. Older drafts put the two halves in the 337 * opposite order, so that the GUID comes first. 338 * 339 * Targets conforming to these obsolete drafts can be 340 * recognized by the I/O Class they report. 341 */ 342 if (target->io_class == SRP_REV10_IB_IO_CLASS) { 343 memcpy(req->priv.initiator_port_id, 344 &target->path.sgid.global.interface_id, 8); 345 memcpy(req->priv.initiator_port_id + 8, 346 &target->initiator_ext, 8); 347 memcpy(req->priv.target_port_id, &target->ioc_guid, 8); 348 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8); 349 } else { 350 memcpy(req->priv.initiator_port_id, 351 &target->initiator_ext, 8); 352 memcpy(req->priv.initiator_port_id + 8, 353 &target->path.sgid.global.interface_id, 8); 354 memcpy(req->priv.target_port_id, &target->id_ext, 8); 355 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8); 356 } 357 358 /* 359 * Topspin/Cisco SRP targets will reject our login unless we 360 * zero out the first 8 bytes of our initiator port ID and set 361 * the second 8 bytes to the local node GUID. 362 */ 363 if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) { 364 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround " 365 "activated for target GUID %016llx\n", 366 (unsigned long long) be64_to_cpu(target->ioc_guid)); 367 memset(req->priv.initiator_port_id, 0, 8); 368 memcpy(req->priv.initiator_port_id + 8, 369 &target->srp_host->dev->dev->node_guid, 8); 370 } 371 372 status = ib_send_cm_req(target->cm_id, &req->param); 373 374 kfree(req); 375 376 return status; 377 } 378 379 static void srp_disconnect_target(struct srp_target_port *target) 380 { 381 /* XXX should send SRP_I_LOGOUT request */ 382 383 init_completion(&target->done); 384 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) { 385 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n"); 386 return; 387 } 388 wait_for_completion(&target->done); 389 } 390 391 static void srp_remove_work(struct work_struct *work) 392 { 393 struct srp_target_port *target = 394 container_of(work, struct srp_target_port, work); 395 396 spin_lock_irq(target->scsi_host->host_lock); 397 if (target->state != SRP_TARGET_DEAD) { 398 spin_unlock_irq(target->scsi_host->host_lock); 399 return; 400 } 401 target->state = SRP_TARGET_REMOVED; 402 spin_unlock_irq(target->scsi_host->host_lock); 403 404 spin_lock(&target->srp_host->target_lock); 405 list_del(&target->list); 406 spin_unlock(&target->srp_host->target_lock); 407 408 scsi_remove_host(target->scsi_host); 409 ib_destroy_cm_id(target->cm_id); 410 srp_free_target_ib(target); 411 scsi_host_put(target->scsi_host); 412 } 413 414 static int srp_connect_target(struct srp_target_port *target) 415 { 416 int ret; 417 418 ret = srp_lookup_path(target); 419 if (ret) 420 return ret; 421 422 while (1) { 423 init_completion(&target->done); 424 ret = srp_send_req(target); 425 if (ret) 426 return ret; 427 wait_for_completion(&target->done); 428 429 /* 430 * The CM event handling code will set status to 431 * SRP_PORT_REDIRECT if we get a port redirect REJ 432 * back, or SRP_DLID_REDIRECT if we get a lid/qp 433 * redirect REJ back. 434 */ 435 switch (target->status) { 436 case 0: 437 return 0; 438 439 case SRP_PORT_REDIRECT: 440 ret = srp_lookup_path(target); 441 if (ret) 442 return ret; 443 break; 444 445 case SRP_DLID_REDIRECT: 446 break; 447 448 default: 449 return target->status; 450 } 451 } 452 } 453 454 static void srp_unmap_data(struct scsi_cmnd *scmnd, 455 struct srp_target_port *target, 456 struct srp_request *req) 457 { 458 struct scatterlist *scat; 459 int nents; 460 461 if (!scmnd->request_buffer || 462 (scmnd->sc_data_direction != DMA_TO_DEVICE && 463 scmnd->sc_data_direction != DMA_FROM_DEVICE)) 464 return; 465 466 if (req->fmr) { 467 ib_fmr_pool_unmap(req->fmr); 468 req->fmr = NULL; 469 } 470 471 /* 472 * This handling of non-SG commands can be killed when the 473 * SCSI midlayer no longer generates non-SG commands. 474 */ 475 if (likely(scmnd->use_sg)) { 476 nents = scmnd->use_sg; 477 scat = scmnd->request_buffer; 478 } else { 479 nents = 1; 480 scat = &req->fake_sg; 481 } 482 483 ib_dma_unmap_sg(target->srp_host->dev->dev, scat, nents, 484 scmnd->sc_data_direction); 485 } 486 487 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req) 488 { 489 srp_unmap_data(req->scmnd, target, req); 490 list_move_tail(&req->list, &target->free_reqs); 491 } 492 493 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req) 494 { 495 req->scmnd->result = DID_RESET << 16; 496 req->scmnd->scsi_done(req->scmnd); 497 srp_remove_req(target, req); 498 } 499 500 static int srp_reconnect_target(struct srp_target_port *target) 501 { 502 struct ib_cm_id *new_cm_id; 503 struct ib_qp_attr qp_attr; 504 struct srp_request *req, *tmp; 505 struct ib_wc wc; 506 int ret; 507 508 spin_lock_irq(target->scsi_host->host_lock); 509 if (target->state != SRP_TARGET_LIVE) { 510 spin_unlock_irq(target->scsi_host->host_lock); 511 return -EAGAIN; 512 } 513 target->state = SRP_TARGET_CONNECTING; 514 spin_unlock_irq(target->scsi_host->host_lock); 515 516 srp_disconnect_target(target); 517 /* 518 * Now get a new local CM ID so that we avoid confusing the 519 * target in case things are really fouled up. 520 */ 521 new_cm_id = ib_create_cm_id(target->srp_host->dev->dev, 522 srp_cm_handler, target); 523 if (IS_ERR(new_cm_id)) { 524 ret = PTR_ERR(new_cm_id); 525 goto err; 526 } 527 ib_destroy_cm_id(target->cm_id); 528 target->cm_id = new_cm_id; 529 530 qp_attr.qp_state = IB_QPS_RESET; 531 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE); 532 if (ret) 533 goto err; 534 535 ret = srp_init_qp(target, target->qp); 536 if (ret) 537 goto err; 538 539 while (ib_poll_cq(target->cq, 1, &wc) > 0) 540 ; /* nothing */ 541 542 spin_lock_irq(target->scsi_host->host_lock); 543 list_for_each_entry_safe(req, tmp, &target->req_queue, list) 544 srp_reset_req(target, req); 545 spin_unlock_irq(target->scsi_host->host_lock); 546 547 target->rx_head = 0; 548 target->tx_head = 0; 549 target->tx_tail = 0; 550 551 target->qp_in_error = 0; 552 ret = srp_connect_target(target); 553 if (ret) 554 goto err; 555 556 spin_lock_irq(target->scsi_host->host_lock); 557 if (target->state == SRP_TARGET_CONNECTING) { 558 ret = 0; 559 target->state = SRP_TARGET_LIVE; 560 } else 561 ret = -EAGAIN; 562 spin_unlock_irq(target->scsi_host->host_lock); 563 564 return ret; 565 566 err: 567 printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret); 568 569 /* 570 * We couldn't reconnect, so kill our target port off. 571 * However, we have to defer the real removal because we might 572 * be in the context of the SCSI error handler now, which 573 * would deadlock if we call scsi_remove_host(). 574 */ 575 spin_lock_irq(target->scsi_host->host_lock); 576 if (target->state == SRP_TARGET_CONNECTING) { 577 target->state = SRP_TARGET_DEAD; 578 INIT_WORK(&target->work, srp_remove_work); 579 schedule_work(&target->work); 580 } 581 spin_unlock_irq(target->scsi_host->host_lock); 582 583 return ret; 584 } 585 586 static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat, 587 int sg_cnt, struct srp_request *req, 588 struct srp_direct_buf *buf) 589 { 590 u64 io_addr = 0; 591 u64 *dma_pages; 592 u32 len; 593 int page_cnt; 594 int i, j; 595 int ret; 596 struct srp_device *dev = target->srp_host->dev; 597 struct ib_device *ibdev = dev->dev; 598 599 if (!dev->fmr_pool) 600 return -ENODEV; 601 602 if ((ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask) && 603 mellanox_workarounds && !memcmp(&target->ioc_guid, mellanox_oui, 3)) 604 return -EINVAL; 605 606 len = page_cnt = 0; 607 for (i = 0; i < sg_cnt; ++i) { 608 unsigned int dma_len = ib_sg_dma_len(ibdev, &scat[i]); 609 610 if (ib_sg_dma_address(ibdev, &scat[i]) & ~dev->fmr_page_mask) { 611 if (i > 0) 612 return -EINVAL; 613 else 614 ++page_cnt; 615 } 616 if ((ib_sg_dma_address(ibdev, &scat[i]) + dma_len) & 617 ~dev->fmr_page_mask) { 618 if (i < sg_cnt - 1) 619 return -EINVAL; 620 else 621 ++page_cnt; 622 } 623 624 len += dma_len; 625 } 626 627 page_cnt += len >> dev->fmr_page_shift; 628 if (page_cnt > SRP_FMR_SIZE) 629 return -ENOMEM; 630 631 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC); 632 if (!dma_pages) 633 return -ENOMEM; 634 635 page_cnt = 0; 636 for (i = 0; i < sg_cnt; ++i) { 637 unsigned int dma_len = ib_sg_dma_len(ibdev, &scat[i]); 638 639 for (j = 0; j < dma_len; j += dev->fmr_page_size) 640 dma_pages[page_cnt++] = 641 (ib_sg_dma_address(ibdev, &scat[i]) & 642 dev->fmr_page_mask) + j; 643 } 644 645 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool, 646 dma_pages, page_cnt, io_addr); 647 if (IS_ERR(req->fmr)) { 648 ret = PTR_ERR(req->fmr); 649 req->fmr = NULL; 650 goto out; 651 } 652 653 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) & 654 ~dev->fmr_page_mask); 655 buf->key = cpu_to_be32(req->fmr->fmr->rkey); 656 buf->len = cpu_to_be32(len); 657 658 ret = 0; 659 660 out: 661 kfree(dma_pages); 662 663 return ret; 664 } 665 666 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target, 667 struct srp_request *req) 668 { 669 struct scatterlist *scat; 670 struct srp_cmd *cmd = req->cmd->buf; 671 int len, nents, count; 672 u8 fmt = SRP_DATA_DESC_DIRECT; 673 struct srp_device *dev; 674 struct ib_device *ibdev; 675 676 if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE) 677 return sizeof (struct srp_cmd); 678 679 if (scmnd->sc_data_direction != DMA_FROM_DEVICE && 680 scmnd->sc_data_direction != DMA_TO_DEVICE) { 681 printk(KERN_WARNING PFX "Unhandled data direction %d\n", 682 scmnd->sc_data_direction); 683 return -EINVAL; 684 } 685 686 /* 687 * This handling of non-SG commands can be killed when the 688 * SCSI midlayer no longer generates non-SG commands. 689 */ 690 if (likely(scmnd->use_sg)) { 691 nents = scmnd->use_sg; 692 scat = scmnd->request_buffer; 693 } else { 694 nents = 1; 695 scat = &req->fake_sg; 696 sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen); 697 } 698 699 dev = target->srp_host->dev; 700 ibdev = dev->dev; 701 702 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction); 703 704 fmt = SRP_DATA_DESC_DIRECT; 705 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf); 706 707 if (count == 1) { 708 /* 709 * The midlayer only generated a single gather/scatter 710 * entry, or DMA mapping coalesced everything to a 711 * single entry. So a direct descriptor along with 712 * the DMA MR suffices. 713 */ 714 struct srp_direct_buf *buf = (void *) cmd->add_data; 715 716 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat)); 717 buf->key = cpu_to_be32(dev->mr->rkey); 718 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat)); 719 } else if (srp_map_fmr(target, scat, count, req, 720 (void *) cmd->add_data)) { 721 /* 722 * FMR mapping failed, and the scatterlist has more 723 * than one entry. Generate an indirect memory 724 * descriptor. 725 */ 726 struct srp_indirect_buf *buf = (void *) cmd->add_data; 727 u32 datalen = 0; 728 int i; 729 730 fmt = SRP_DATA_DESC_INDIRECT; 731 len = sizeof (struct srp_cmd) + 732 sizeof (struct srp_indirect_buf) + 733 count * sizeof (struct srp_direct_buf); 734 735 for (i = 0; i < count; ++i) { 736 unsigned int dma_len = ib_sg_dma_len(ibdev, &scat[i]); 737 738 buf->desc_list[i].va = 739 cpu_to_be64(ib_sg_dma_address(ibdev, &scat[i])); 740 buf->desc_list[i].key = 741 cpu_to_be32(dev->mr->rkey); 742 buf->desc_list[i].len = cpu_to_be32(dma_len); 743 datalen += dma_len; 744 } 745 746 if (scmnd->sc_data_direction == DMA_TO_DEVICE) 747 cmd->data_out_desc_cnt = count; 748 else 749 cmd->data_in_desc_cnt = count; 750 751 buf->table_desc.va = 752 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf); 753 buf->table_desc.key = 754 cpu_to_be32(target->srp_host->dev->mr->rkey); 755 buf->table_desc.len = 756 cpu_to_be32(count * sizeof (struct srp_direct_buf)); 757 758 buf->len = cpu_to_be32(datalen); 759 } 760 761 if (scmnd->sc_data_direction == DMA_TO_DEVICE) 762 cmd->buf_fmt = fmt << 4; 763 else 764 cmd->buf_fmt = fmt; 765 766 return len; 767 } 768 769 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp) 770 { 771 struct srp_request *req; 772 struct scsi_cmnd *scmnd; 773 unsigned long flags; 774 s32 delta; 775 776 delta = (s32) be32_to_cpu(rsp->req_lim_delta); 777 778 spin_lock_irqsave(target->scsi_host->host_lock, flags); 779 780 target->req_lim += delta; 781 782 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT]; 783 784 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) { 785 if (be32_to_cpu(rsp->resp_data_len) < 4) 786 req->tsk_status = -1; 787 else 788 req->tsk_status = rsp->data[3]; 789 complete(&req->done); 790 } else { 791 scmnd = req->scmnd; 792 if (!scmnd) 793 printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n", 794 (unsigned long long) rsp->tag); 795 scmnd->result = rsp->status; 796 797 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) { 798 memcpy(scmnd->sense_buffer, rsp->data + 799 be32_to_cpu(rsp->resp_data_len), 800 min_t(int, be32_to_cpu(rsp->sense_data_len), 801 SCSI_SENSE_BUFFERSIZE)); 802 } 803 804 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER)) 805 scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt); 806 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER)) 807 scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt); 808 809 if (!req->tsk_mgmt) { 810 scmnd->host_scribble = (void *) -1L; 811 scmnd->scsi_done(scmnd); 812 813 srp_remove_req(target, req); 814 } else 815 req->cmd_done = 1; 816 } 817 818 spin_unlock_irqrestore(target->scsi_host->host_lock, flags); 819 } 820 821 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc) 822 { 823 struct ib_device *dev; 824 struct srp_iu *iu; 825 u8 opcode; 826 827 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV]; 828 829 dev = target->srp_host->dev->dev; 830 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len, 831 DMA_FROM_DEVICE); 832 833 opcode = *(u8 *) iu->buf; 834 835 if (0) { 836 int i; 837 838 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode); 839 840 for (i = 0; i < wc->byte_len; ++i) { 841 if (i % 8 == 0) 842 printk(KERN_ERR " [%02x] ", i); 843 printk(" %02x", ((u8 *) iu->buf)[i]); 844 if ((i + 1) % 8 == 0) 845 printk("\n"); 846 } 847 848 if (wc->byte_len % 8) 849 printk("\n"); 850 } 851 852 switch (opcode) { 853 case SRP_RSP: 854 srp_process_rsp(target, iu->buf); 855 break; 856 857 case SRP_T_LOGOUT: 858 /* XXX Handle target logout */ 859 printk(KERN_WARNING PFX "Got target logout request\n"); 860 break; 861 862 default: 863 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode); 864 break; 865 } 866 867 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len, 868 DMA_FROM_DEVICE); 869 } 870 871 static void srp_completion(struct ib_cq *cq, void *target_ptr) 872 { 873 struct srp_target_port *target = target_ptr; 874 struct ib_wc wc; 875 876 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); 877 while (ib_poll_cq(cq, 1, &wc) > 0) { 878 if (wc.status) { 879 printk(KERN_ERR PFX "failed %s status %d\n", 880 wc.wr_id & SRP_OP_RECV ? "receive" : "send", 881 wc.status); 882 target->qp_in_error = 1; 883 break; 884 } 885 886 if (wc.wr_id & SRP_OP_RECV) 887 srp_handle_recv(target, &wc); 888 else 889 ++target->tx_tail; 890 } 891 } 892 893 static int __srp_post_recv(struct srp_target_port *target) 894 { 895 struct srp_iu *iu; 896 struct ib_sge list; 897 struct ib_recv_wr wr, *bad_wr; 898 unsigned int next; 899 int ret; 900 901 next = target->rx_head & (SRP_RQ_SIZE - 1); 902 wr.wr_id = next | SRP_OP_RECV; 903 iu = target->rx_ring[next]; 904 905 list.addr = iu->dma; 906 list.length = iu->size; 907 list.lkey = target->srp_host->dev->mr->lkey; 908 909 wr.next = NULL; 910 wr.sg_list = &list; 911 wr.num_sge = 1; 912 913 ret = ib_post_recv(target->qp, &wr, &bad_wr); 914 if (!ret) 915 ++target->rx_head; 916 917 return ret; 918 } 919 920 static int srp_post_recv(struct srp_target_port *target) 921 { 922 unsigned long flags; 923 int ret; 924 925 spin_lock_irqsave(target->scsi_host->host_lock, flags); 926 ret = __srp_post_recv(target); 927 spin_unlock_irqrestore(target->scsi_host->host_lock, flags); 928 929 return ret; 930 } 931 932 /* 933 * Must be called with target->scsi_host->host_lock held to protect 934 * req_lim and tx_head. Lock cannot be dropped between call here and 935 * call to __srp_post_send(). 936 */ 937 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target) 938 { 939 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE) 940 return NULL; 941 942 if (unlikely(target->req_lim < 1)) 943 ++target->zero_req_lim; 944 945 return target->tx_ring[target->tx_head & SRP_SQ_SIZE]; 946 } 947 948 /* 949 * Must be called with target->scsi_host->host_lock held to protect 950 * req_lim and tx_head. 951 */ 952 static int __srp_post_send(struct srp_target_port *target, 953 struct srp_iu *iu, int len) 954 { 955 struct ib_sge list; 956 struct ib_send_wr wr, *bad_wr; 957 int ret = 0; 958 959 list.addr = iu->dma; 960 list.length = len; 961 list.lkey = target->srp_host->dev->mr->lkey; 962 963 wr.next = NULL; 964 wr.wr_id = target->tx_head & SRP_SQ_SIZE; 965 wr.sg_list = &list; 966 wr.num_sge = 1; 967 wr.opcode = IB_WR_SEND; 968 wr.send_flags = IB_SEND_SIGNALED; 969 970 ret = ib_post_send(target->qp, &wr, &bad_wr); 971 972 if (!ret) { 973 ++target->tx_head; 974 --target->req_lim; 975 } 976 977 return ret; 978 } 979 980 static int srp_queuecommand(struct scsi_cmnd *scmnd, 981 void (*done)(struct scsi_cmnd *)) 982 { 983 struct srp_target_port *target = host_to_target(scmnd->device->host); 984 struct srp_request *req; 985 struct srp_iu *iu; 986 struct srp_cmd *cmd; 987 struct ib_device *dev; 988 int len; 989 990 if (target->state == SRP_TARGET_CONNECTING) 991 goto err; 992 993 if (target->state == SRP_TARGET_DEAD || 994 target->state == SRP_TARGET_REMOVED) { 995 scmnd->result = DID_BAD_TARGET << 16; 996 done(scmnd); 997 return 0; 998 } 999 1000 iu = __srp_get_tx_iu(target); 1001 if (!iu) 1002 goto err; 1003 1004 dev = target->srp_host->dev->dev; 1005 ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len, 1006 DMA_TO_DEVICE); 1007 1008 req = list_entry(target->free_reqs.next, struct srp_request, list); 1009 1010 scmnd->scsi_done = done; 1011 scmnd->result = 0; 1012 scmnd->host_scribble = (void *) (long) req->index; 1013 1014 cmd = iu->buf; 1015 memset(cmd, 0, sizeof *cmd); 1016 1017 cmd->opcode = SRP_CMD; 1018 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48); 1019 cmd->tag = req->index; 1020 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len); 1021 1022 req->scmnd = scmnd; 1023 req->cmd = iu; 1024 req->cmd_done = 0; 1025 req->tsk_mgmt = NULL; 1026 1027 len = srp_map_data(scmnd, target, req); 1028 if (len < 0) { 1029 printk(KERN_ERR PFX "Failed to map data\n"); 1030 goto err; 1031 } 1032 1033 if (__srp_post_recv(target)) { 1034 printk(KERN_ERR PFX "Recv failed\n"); 1035 goto err_unmap; 1036 } 1037 1038 ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len, 1039 DMA_TO_DEVICE); 1040 1041 if (__srp_post_send(target, iu, len)) { 1042 printk(KERN_ERR PFX "Send failed\n"); 1043 goto err_unmap; 1044 } 1045 1046 list_move_tail(&req->list, &target->req_queue); 1047 1048 return 0; 1049 1050 err_unmap: 1051 srp_unmap_data(scmnd, target, req); 1052 1053 err: 1054 return SCSI_MLQUEUE_HOST_BUSY; 1055 } 1056 1057 static int srp_alloc_iu_bufs(struct srp_target_port *target) 1058 { 1059 int i; 1060 1061 for (i = 0; i < SRP_RQ_SIZE; ++i) { 1062 target->rx_ring[i] = srp_alloc_iu(target->srp_host, 1063 target->max_ti_iu_len, 1064 GFP_KERNEL, DMA_FROM_DEVICE); 1065 if (!target->rx_ring[i]) 1066 goto err; 1067 } 1068 1069 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) { 1070 target->tx_ring[i] = srp_alloc_iu(target->srp_host, 1071 srp_max_iu_len, 1072 GFP_KERNEL, DMA_TO_DEVICE); 1073 if (!target->tx_ring[i]) 1074 goto err; 1075 } 1076 1077 return 0; 1078 1079 err: 1080 for (i = 0; i < SRP_RQ_SIZE; ++i) { 1081 srp_free_iu(target->srp_host, target->rx_ring[i]); 1082 target->rx_ring[i] = NULL; 1083 } 1084 1085 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) { 1086 srp_free_iu(target->srp_host, target->tx_ring[i]); 1087 target->tx_ring[i] = NULL; 1088 } 1089 1090 return -ENOMEM; 1091 } 1092 1093 static void srp_cm_rej_handler(struct ib_cm_id *cm_id, 1094 struct ib_cm_event *event, 1095 struct srp_target_port *target) 1096 { 1097 struct ib_class_port_info *cpi; 1098 int opcode; 1099 1100 switch (event->param.rej_rcvd.reason) { 1101 case IB_CM_REJ_PORT_CM_REDIRECT: 1102 cpi = event->param.rej_rcvd.ari; 1103 target->path.dlid = cpi->redirect_lid; 1104 target->path.pkey = cpi->redirect_pkey; 1105 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff; 1106 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16); 1107 1108 target->status = target->path.dlid ? 1109 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT; 1110 break; 1111 1112 case IB_CM_REJ_PORT_REDIRECT: 1113 if (topspin_workarounds && 1114 !memcmp(&target->ioc_guid, topspin_oui, 3)) { 1115 /* 1116 * Topspin/Cisco SRP gateways incorrectly send 1117 * reject reason code 25 when they mean 24 1118 * (port redirect). 1119 */ 1120 memcpy(target->path.dgid.raw, 1121 event->param.rej_rcvd.ari, 16); 1122 1123 printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n", 1124 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix), 1125 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id)); 1126 1127 target->status = SRP_PORT_REDIRECT; 1128 } else { 1129 printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n"); 1130 target->status = -ECONNRESET; 1131 } 1132 break; 1133 1134 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID: 1135 printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n"); 1136 target->status = -ECONNRESET; 1137 break; 1138 1139 case IB_CM_REJ_CONSUMER_DEFINED: 1140 opcode = *(u8 *) event->private_data; 1141 if (opcode == SRP_LOGIN_REJ) { 1142 struct srp_login_rej *rej = event->private_data; 1143 u32 reason = be32_to_cpu(rej->reason); 1144 1145 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE) 1146 printk(KERN_WARNING PFX 1147 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n"); 1148 else 1149 printk(KERN_WARNING PFX 1150 "SRP LOGIN REJECTED, reason 0x%08x\n", reason); 1151 } else 1152 printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED," 1153 " opcode 0x%02x\n", opcode); 1154 target->status = -ECONNRESET; 1155 break; 1156 1157 default: 1158 printk(KERN_WARNING " REJ reason 0x%x\n", 1159 event->param.rej_rcvd.reason); 1160 target->status = -ECONNRESET; 1161 } 1162 } 1163 1164 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 1165 { 1166 struct srp_target_port *target = cm_id->context; 1167 struct ib_qp_attr *qp_attr = NULL; 1168 int attr_mask = 0; 1169 int comp = 0; 1170 int opcode = 0; 1171 1172 switch (event->event) { 1173 case IB_CM_REQ_ERROR: 1174 printk(KERN_DEBUG PFX "Sending CM REQ failed\n"); 1175 comp = 1; 1176 target->status = -ECONNRESET; 1177 break; 1178 1179 case IB_CM_REP_RECEIVED: 1180 comp = 1; 1181 opcode = *(u8 *) event->private_data; 1182 1183 if (opcode == SRP_LOGIN_RSP) { 1184 struct srp_login_rsp *rsp = event->private_data; 1185 1186 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len); 1187 target->req_lim = be32_to_cpu(rsp->req_lim_delta); 1188 1189 target->scsi_host->can_queue = min(target->req_lim, 1190 target->scsi_host->can_queue); 1191 } else { 1192 printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode); 1193 target->status = -ECONNRESET; 1194 break; 1195 } 1196 1197 if (!target->rx_ring[0]) { 1198 target->status = srp_alloc_iu_bufs(target); 1199 if (target->status) 1200 break; 1201 } 1202 1203 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL); 1204 if (!qp_attr) { 1205 target->status = -ENOMEM; 1206 break; 1207 } 1208 1209 qp_attr->qp_state = IB_QPS_RTR; 1210 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); 1211 if (target->status) 1212 break; 1213 1214 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask); 1215 if (target->status) 1216 break; 1217 1218 target->status = srp_post_recv(target); 1219 if (target->status) 1220 break; 1221 1222 qp_attr->qp_state = IB_QPS_RTS; 1223 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); 1224 if (target->status) 1225 break; 1226 1227 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask); 1228 if (target->status) 1229 break; 1230 1231 target->status = ib_send_cm_rtu(cm_id, NULL, 0); 1232 if (target->status) 1233 break; 1234 1235 break; 1236 1237 case IB_CM_REJ_RECEIVED: 1238 printk(KERN_DEBUG PFX "REJ received\n"); 1239 comp = 1; 1240 1241 srp_cm_rej_handler(cm_id, event, target); 1242 break; 1243 1244 case IB_CM_DREQ_RECEIVED: 1245 printk(KERN_WARNING PFX "DREQ received - connection closed\n"); 1246 if (ib_send_cm_drep(cm_id, NULL, 0)) 1247 printk(KERN_ERR PFX "Sending CM DREP failed\n"); 1248 break; 1249 1250 case IB_CM_TIMEWAIT_EXIT: 1251 printk(KERN_ERR PFX "connection closed\n"); 1252 1253 comp = 1; 1254 target->status = 0; 1255 break; 1256 1257 case IB_CM_MRA_RECEIVED: 1258 case IB_CM_DREQ_ERROR: 1259 case IB_CM_DREP_RECEIVED: 1260 break; 1261 1262 default: 1263 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event); 1264 break; 1265 } 1266 1267 if (comp) 1268 complete(&target->done); 1269 1270 kfree(qp_attr); 1271 1272 return 0; 1273 } 1274 1275 static int srp_send_tsk_mgmt(struct srp_target_port *target, 1276 struct srp_request *req, u8 func) 1277 { 1278 struct srp_iu *iu; 1279 struct srp_tsk_mgmt *tsk_mgmt; 1280 1281 spin_lock_irq(target->scsi_host->host_lock); 1282 1283 if (target->state == SRP_TARGET_DEAD || 1284 target->state == SRP_TARGET_REMOVED) { 1285 req->scmnd->result = DID_BAD_TARGET << 16; 1286 goto out; 1287 } 1288 1289 init_completion(&req->done); 1290 1291 iu = __srp_get_tx_iu(target); 1292 if (!iu) 1293 goto out; 1294 1295 tsk_mgmt = iu->buf; 1296 memset(tsk_mgmt, 0, sizeof *tsk_mgmt); 1297 1298 tsk_mgmt->opcode = SRP_TSK_MGMT; 1299 tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48); 1300 tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT; 1301 tsk_mgmt->tsk_mgmt_func = func; 1302 tsk_mgmt->task_tag = req->index; 1303 1304 if (__srp_post_send(target, iu, sizeof *tsk_mgmt)) 1305 goto out; 1306 1307 req->tsk_mgmt = iu; 1308 1309 spin_unlock_irq(target->scsi_host->host_lock); 1310 1311 if (!wait_for_completion_timeout(&req->done, 1312 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS))) 1313 return -1; 1314 1315 return 0; 1316 1317 out: 1318 spin_unlock_irq(target->scsi_host->host_lock); 1319 return -1; 1320 } 1321 1322 static int srp_find_req(struct srp_target_port *target, 1323 struct scsi_cmnd *scmnd, 1324 struct srp_request **req) 1325 { 1326 if (scmnd->host_scribble == (void *) -1L) 1327 return -1; 1328 1329 *req = &target->req_ring[(long) scmnd->host_scribble]; 1330 1331 return 0; 1332 } 1333 1334 static int srp_abort(struct scsi_cmnd *scmnd) 1335 { 1336 struct srp_target_port *target = host_to_target(scmnd->device->host); 1337 struct srp_request *req; 1338 int ret = SUCCESS; 1339 1340 printk(KERN_ERR "SRP abort called\n"); 1341 1342 if (target->qp_in_error) 1343 return FAILED; 1344 if (srp_find_req(target, scmnd, &req)) 1345 return FAILED; 1346 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK)) 1347 return FAILED; 1348 1349 spin_lock_irq(target->scsi_host->host_lock); 1350 1351 if (req->cmd_done) { 1352 srp_remove_req(target, req); 1353 scmnd->scsi_done(scmnd); 1354 } else if (!req->tsk_status) { 1355 srp_remove_req(target, req); 1356 scmnd->result = DID_ABORT << 16; 1357 } else 1358 ret = FAILED; 1359 1360 spin_unlock_irq(target->scsi_host->host_lock); 1361 1362 return ret; 1363 } 1364 1365 static int srp_reset_device(struct scsi_cmnd *scmnd) 1366 { 1367 struct srp_target_port *target = host_to_target(scmnd->device->host); 1368 struct srp_request *req, *tmp; 1369 1370 printk(KERN_ERR "SRP reset_device called\n"); 1371 1372 if (target->qp_in_error) 1373 return FAILED; 1374 if (srp_find_req(target, scmnd, &req)) 1375 return FAILED; 1376 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET)) 1377 return FAILED; 1378 if (req->tsk_status) 1379 return FAILED; 1380 1381 spin_lock_irq(target->scsi_host->host_lock); 1382 1383 list_for_each_entry_safe(req, tmp, &target->req_queue, list) 1384 if (req->scmnd->device == scmnd->device) 1385 srp_reset_req(target, req); 1386 1387 spin_unlock_irq(target->scsi_host->host_lock); 1388 1389 return SUCCESS; 1390 } 1391 1392 static int srp_reset_host(struct scsi_cmnd *scmnd) 1393 { 1394 struct srp_target_port *target = host_to_target(scmnd->device->host); 1395 int ret = FAILED; 1396 1397 printk(KERN_ERR PFX "SRP reset_host called\n"); 1398 1399 if (!srp_reconnect_target(target)) 1400 ret = SUCCESS; 1401 1402 return ret; 1403 } 1404 1405 static ssize_t show_id_ext(struct class_device *cdev, char *buf) 1406 { 1407 struct srp_target_port *target = host_to_target(class_to_shost(cdev)); 1408 1409 if (target->state == SRP_TARGET_DEAD || 1410 target->state == SRP_TARGET_REMOVED) 1411 return -ENODEV; 1412 1413 return sprintf(buf, "0x%016llx\n", 1414 (unsigned long long) be64_to_cpu(target->id_ext)); 1415 } 1416 1417 static ssize_t show_ioc_guid(struct class_device *cdev, char *buf) 1418 { 1419 struct srp_target_port *target = host_to_target(class_to_shost(cdev)); 1420 1421 if (target->state == SRP_TARGET_DEAD || 1422 target->state == SRP_TARGET_REMOVED) 1423 return -ENODEV; 1424 1425 return sprintf(buf, "0x%016llx\n", 1426 (unsigned long long) be64_to_cpu(target->ioc_guid)); 1427 } 1428 1429 static ssize_t show_service_id(struct class_device *cdev, char *buf) 1430 { 1431 struct srp_target_port *target = host_to_target(class_to_shost(cdev)); 1432 1433 if (target->state == SRP_TARGET_DEAD || 1434 target->state == SRP_TARGET_REMOVED) 1435 return -ENODEV; 1436 1437 return sprintf(buf, "0x%016llx\n", 1438 (unsigned long long) be64_to_cpu(target->service_id)); 1439 } 1440 1441 static ssize_t show_pkey(struct class_device *cdev, char *buf) 1442 { 1443 struct srp_target_port *target = host_to_target(class_to_shost(cdev)); 1444 1445 if (target->state == SRP_TARGET_DEAD || 1446 target->state == SRP_TARGET_REMOVED) 1447 return -ENODEV; 1448 1449 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey)); 1450 } 1451 1452 static ssize_t show_dgid(struct class_device *cdev, char *buf) 1453 { 1454 struct srp_target_port *target = host_to_target(class_to_shost(cdev)); 1455 1456 if (target->state == SRP_TARGET_DEAD || 1457 target->state == SRP_TARGET_REMOVED) 1458 return -ENODEV; 1459 1460 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", 1461 be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]), 1462 be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]), 1463 be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]), 1464 be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]), 1465 be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]), 1466 be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]), 1467 be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]), 1468 be16_to_cpu(((__be16 *) target->path.dgid.raw)[7])); 1469 } 1470 1471 static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf) 1472 { 1473 struct srp_target_port *target = host_to_target(class_to_shost(cdev)); 1474 1475 if (target->state == SRP_TARGET_DEAD || 1476 target->state == SRP_TARGET_REMOVED) 1477 return -ENODEV; 1478 1479 return sprintf(buf, "%d\n", target->zero_req_lim); 1480 } 1481 1482 static ssize_t show_local_ib_port(struct class_device *cdev, char *buf) 1483 { 1484 struct srp_target_port *target = host_to_target(class_to_shost(cdev)); 1485 1486 return sprintf(buf, "%d\n", target->srp_host->port); 1487 } 1488 1489 static ssize_t show_local_ib_device(struct class_device *cdev, char *buf) 1490 { 1491 struct srp_target_port *target = host_to_target(class_to_shost(cdev)); 1492 1493 return sprintf(buf, "%s\n", target->srp_host->dev->dev->name); 1494 } 1495 1496 static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL); 1497 static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL); 1498 static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL); 1499 static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); 1500 static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL); 1501 static CLASS_DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL); 1502 static CLASS_DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL); 1503 static CLASS_DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL); 1504 1505 static struct class_device_attribute *srp_host_attrs[] = { 1506 &class_device_attr_id_ext, 1507 &class_device_attr_ioc_guid, 1508 &class_device_attr_service_id, 1509 &class_device_attr_pkey, 1510 &class_device_attr_dgid, 1511 &class_device_attr_zero_req_lim, 1512 &class_device_attr_local_ib_port, 1513 &class_device_attr_local_ib_device, 1514 NULL 1515 }; 1516 1517 static struct scsi_host_template srp_template = { 1518 .module = THIS_MODULE, 1519 .name = DRV_NAME, 1520 .info = srp_target_info, 1521 .queuecommand = srp_queuecommand, 1522 .eh_abort_handler = srp_abort, 1523 .eh_device_reset_handler = srp_reset_device, 1524 .eh_host_reset_handler = srp_reset_host, 1525 .can_queue = SRP_SQ_SIZE, 1526 .this_id = -1, 1527 .cmd_per_lun = SRP_SQ_SIZE, 1528 .use_clustering = ENABLE_CLUSTERING, 1529 .shost_attrs = srp_host_attrs 1530 }; 1531 1532 static int srp_add_target(struct srp_host *host, struct srp_target_port *target) 1533 { 1534 sprintf(target->target_name, "SRP.T10:%016llX", 1535 (unsigned long long) be64_to_cpu(target->id_ext)); 1536 1537 if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device)) 1538 return -ENODEV; 1539 1540 spin_lock(&host->target_lock); 1541 list_add_tail(&target->list, &host->target_list); 1542 spin_unlock(&host->target_lock); 1543 1544 target->state = SRP_TARGET_LIVE; 1545 1546 scsi_scan_target(&target->scsi_host->shost_gendev, 1547 0, target->scsi_id, SCAN_WILD_CARD, 0); 1548 1549 return 0; 1550 } 1551 1552 static void srp_release_class_dev(struct class_device *class_dev) 1553 { 1554 struct srp_host *host = 1555 container_of(class_dev, struct srp_host, class_dev); 1556 1557 complete(&host->released); 1558 } 1559 1560 static struct class srp_class = { 1561 .name = "infiniband_srp", 1562 .release = srp_release_class_dev 1563 }; 1564 1565 /* 1566 * Target ports are added by writing 1567 * 1568 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>, 1569 * pkey=<P_Key>,service_id=<service ID> 1570 * 1571 * to the add_target sysfs attribute. 1572 */ 1573 enum { 1574 SRP_OPT_ERR = 0, 1575 SRP_OPT_ID_EXT = 1 << 0, 1576 SRP_OPT_IOC_GUID = 1 << 1, 1577 SRP_OPT_DGID = 1 << 2, 1578 SRP_OPT_PKEY = 1 << 3, 1579 SRP_OPT_SERVICE_ID = 1 << 4, 1580 SRP_OPT_MAX_SECT = 1 << 5, 1581 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6, 1582 SRP_OPT_IO_CLASS = 1 << 7, 1583 SRP_OPT_INITIATOR_EXT = 1 << 8, 1584 SRP_OPT_ALL = (SRP_OPT_ID_EXT | 1585 SRP_OPT_IOC_GUID | 1586 SRP_OPT_DGID | 1587 SRP_OPT_PKEY | 1588 SRP_OPT_SERVICE_ID), 1589 }; 1590 1591 static match_table_t srp_opt_tokens = { 1592 { SRP_OPT_ID_EXT, "id_ext=%s" }, 1593 { SRP_OPT_IOC_GUID, "ioc_guid=%s" }, 1594 { SRP_OPT_DGID, "dgid=%s" }, 1595 { SRP_OPT_PKEY, "pkey=%x" }, 1596 { SRP_OPT_SERVICE_ID, "service_id=%s" }, 1597 { SRP_OPT_MAX_SECT, "max_sect=%d" }, 1598 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" }, 1599 { SRP_OPT_IO_CLASS, "io_class=%x" }, 1600 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" }, 1601 { SRP_OPT_ERR, NULL } 1602 }; 1603 1604 static int srp_parse_options(const char *buf, struct srp_target_port *target) 1605 { 1606 char *options, *sep_opt; 1607 char *p; 1608 char dgid[3]; 1609 substring_t args[MAX_OPT_ARGS]; 1610 int opt_mask = 0; 1611 int token; 1612 int ret = -EINVAL; 1613 int i; 1614 1615 options = kstrdup(buf, GFP_KERNEL); 1616 if (!options) 1617 return -ENOMEM; 1618 1619 sep_opt = options; 1620 while ((p = strsep(&sep_opt, ",")) != NULL) { 1621 if (!*p) 1622 continue; 1623 1624 token = match_token(p, srp_opt_tokens, args); 1625 opt_mask |= token; 1626 1627 switch (token) { 1628 case SRP_OPT_ID_EXT: 1629 p = match_strdup(args); 1630 if (!p) { 1631 ret = -ENOMEM; 1632 goto out; 1633 } 1634 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); 1635 kfree(p); 1636 break; 1637 1638 case SRP_OPT_IOC_GUID: 1639 p = match_strdup(args); 1640 if (!p) { 1641 ret = -ENOMEM; 1642 goto out; 1643 } 1644 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16)); 1645 kfree(p); 1646 break; 1647 1648 case SRP_OPT_DGID: 1649 p = match_strdup(args); 1650 if (!p) { 1651 ret = -ENOMEM; 1652 goto out; 1653 } 1654 if (strlen(p) != 32) { 1655 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p); 1656 kfree(p); 1657 goto out; 1658 } 1659 1660 for (i = 0; i < 16; ++i) { 1661 strlcpy(dgid, p + i * 2, 3); 1662 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16); 1663 } 1664 kfree(p); 1665 break; 1666 1667 case SRP_OPT_PKEY: 1668 if (match_hex(args, &token)) { 1669 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p); 1670 goto out; 1671 } 1672 target->path.pkey = cpu_to_be16(token); 1673 break; 1674 1675 case SRP_OPT_SERVICE_ID: 1676 p = match_strdup(args); 1677 if (!p) { 1678 ret = -ENOMEM; 1679 goto out; 1680 } 1681 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16)); 1682 kfree(p); 1683 break; 1684 1685 case SRP_OPT_MAX_SECT: 1686 if (match_int(args, &token)) { 1687 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p); 1688 goto out; 1689 } 1690 target->scsi_host->max_sectors = token; 1691 break; 1692 1693 case SRP_OPT_MAX_CMD_PER_LUN: 1694 if (match_int(args, &token)) { 1695 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p); 1696 goto out; 1697 } 1698 target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE); 1699 break; 1700 1701 case SRP_OPT_IO_CLASS: 1702 if (match_hex(args, &token)) { 1703 printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p); 1704 goto out; 1705 } 1706 if (token != SRP_REV10_IB_IO_CLASS && 1707 token != SRP_REV16A_IB_IO_CLASS) { 1708 printk(KERN_WARNING PFX "unknown IO class parameter value" 1709 " %x specified (use %x or %x).\n", 1710 token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS); 1711 goto out; 1712 } 1713 target->io_class = token; 1714 break; 1715 1716 case SRP_OPT_INITIATOR_EXT: 1717 p = match_strdup(args); 1718 if (!p) { 1719 ret = -ENOMEM; 1720 goto out; 1721 } 1722 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); 1723 kfree(p); 1724 break; 1725 1726 default: 1727 printk(KERN_WARNING PFX "unknown parameter or missing value " 1728 "'%s' in target creation request\n", p); 1729 goto out; 1730 } 1731 } 1732 1733 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL) 1734 ret = 0; 1735 else 1736 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i) 1737 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) && 1738 !(srp_opt_tokens[i].token & opt_mask)) 1739 printk(KERN_WARNING PFX "target creation request is " 1740 "missing parameter '%s'\n", 1741 srp_opt_tokens[i].pattern); 1742 1743 out: 1744 kfree(options); 1745 return ret; 1746 } 1747 1748 static ssize_t srp_create_target(struct class_device *class_dev, 1749 const char *buf, size_t count) 1750 { 1751 struct srp_host *host = 1752 container_of(class_dev, struct srp_host, class_dev); 1753 struct Scsi_Host *target_host; 1754 struct srp_target_port *target; 1755 int ret; 1756 int i; 1757 1758 target_host = scsi_host_alloc(&srp_template, 1759 sizeof (struct srp_target_port)); 1760 if (!target_host) 1761 return -ENOMEM; 1762 1763 target_host->max_lun = SRP_MAX_LUN; 1764 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb; 1765 1766 target = host_to_target(target_host); 1767 1768 target->io_class = SRP_REV16A_IB_IO_CLASS; 1769 target->scsi_host = target_host; 1770 target->srp_host = host; 1771 1772 INIT_LIST_HEAD(&target->free_reqs); 1773 INIT_LIST_HEAD(&target->req_queue); 1774 for (i = 0; i < SRP_SQ_SIZE; ++i) { 1775 target->req_ring[i].index = i; 1776 list_add_tail(&target->req_ring[i].list, &target->free_reqs); 1777 } 1778 1779 ret = srp_parse_options(buf, target); 1780 if (ret) 1781 goto err; 1782 1783 ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid); 1784 1785 printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x " 1786 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", 1787 (unsigned long long) be64_to_cpu(target->id_ext), 1788 (unsigned long long) be64_to_cpu(target->ioc_guid), 1789 be16_to_cpu(target->path.pkey), 1790 (unsigned long long) be64_to_cpu(target->service_id), 1791 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]), 1792 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]), 1793 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]), 1794 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]), 1795 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]), 1796 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]), 1797 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]), 1798 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14])); 1799 1800 ret = srp_create_target_ib(target); 1801 if (ret) 1802 goto err; 1803 1804 target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target); 1805 if (IS_ERR(target->cm_id)) { 1806 ret = PTR_ERR(target->cm_id); 1807 goto err_free; 1808 } 1809 1810 target->qp_in_error = 0; 1811 ret = srp_connect_target(target); 1812 if (ret) { 1813 printk(KERN_ERR PFX "Connection failed\n"); 1814 goto err_cm_id; 1815 } 1816 1817 ret = srp_add_target(host, target); 1818 if (ret) 1819 goto err_disconnect; 1820 1821 return count; 1822 1823 err_disconnect: 1824 srp_disconnect_target(target); 1825 1826 err_cm_id: 1827 ib_destroy_cm_id(target->cm_id); 1828 1829 err_free: 1830 srp_free_target_ib(target); 1831 1832 err: 1833 scsi_host_put(target_host); 1834 1835 return ret; 1836 } 1837 1838 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target); 1839 1840 static ssize_t show_ibdev(struct class_device *class_dev, char *buf) 1841 { 1842 struct srp_host *host = 1843 container_of(class_dev, struct srp_host, class_dev); 1844 1845 return sprintf(buf, "%s\n", host->dev->dev->name); 1846 } 1847 1848 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 1849 1850 static ssize_t show_port(struct class_device *class_dev, char *buf) 1851 { 1852 struct srp_host *host = 1853 container_of(class_dev, struct srp_host, class_dev); 1854 1855 return sprintf(buf, "%d\n", host->port); 1856 } 1857 1858 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL); 1859 1860 static struct srp_host *srp_add_port(struct srp_device *device, u8 port) 1861 { 1862 struct srp_host *host; 1863 1864 host = kzalloc(sizeof *host, GFP_KERNEL); 1865 if (!host) 1866 return NULL; 1867 1868 INIT_LIST_HEAD(&host->target_list); 1869 spin_lock_init(&host->target_lock); 1870 init_completion(&host->released); 1871 host->dev = device; 1872 host->port = port; 1873 1874 host->class_dev.class = &srp_class; 1875 host->class_dev.dev = device->dev->dma_device; 1876 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d", 1877 device->dev->name, port); 1878 1879 if (class_device_register(&host->class_dev)) 1880 goto free_host; 1881 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target)) 1882 goto err_class; 1883 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev)) 1884 goto err_class; 1885 if (class_device_create_file(&host->class_dev, &class_device_attr_port)) 1886 goto err_class; 1887 1888 return host; 1889 1890 err_class: 1891 class_device_unregister(&host->class_dev); 1892 1893 free_host: 1894 kfree(host); 1895 1896 return NULL; 1897 } 1898 1899 static void srp_add_one(struct ib_device *device) 1900 { 1901 struct srp_device *srp_dev; 1902 struct ib_device_attr *dev_attr; 1903 struct ib_fmr_pool_param fmr_param; 1904 struct srp_host *host; 1905 int s, e, p; 1906 1907 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL); 1908 if (!dev_attr) 1909 return; 1910 1911 if (ib_query_device(device, dev_attr)) { 1912 printk(KERN_WARNING PFX "Query device failed for %s\n", 1913 device->name); 1914 goto free_attr; 1915 } 1916 1917 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL); 1918 if (!srp_dev) 1919 goto free_attr; 1920 1921 /* 1922 * Use the smallest page size supported by the HCA, down to a 1923 * minimum of 512 bytes (which is the smallest sector that a 1924 * SCSI command will ever carry). 1925 */ 1926 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1); 1927 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift; 1928 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1); 1929 1930 INIT_LIST_HEAD(&srp_dev->dev_list); 1931 1932 srp_dev->dev = device; 1933 srp_dev->pd = ib_alloc_pd(device); 1934 if (IS_ERR(srp_dev->pd)) 1935 goto free_dev; 1936 1937 srp_dev->mr = ib_get_dma_mr(srp_dev->pd, 1938 IB_ACCESS_LOCAL_WRITE | 1939 IB_ACCESS_REMOTE_READ | 1940 IB_ACCESS_REMOTE_WRITE); 1941 if (IS_ERR(srp_dev->mr)) 1942 goto err_pd; 1943 1944 memset(&fmr_param, 0, sizeof fmr_param); 1945 fmr_param.pool_size = SRP_FMR_POOL_SIZE; 1946 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE; 1947 fmr_param.cache = 1; 1948 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE; 1949 fmr_param.page_shift = srp_dev->fmr_page_shift; 1950 fmr_param.access = (IB_ACCESS_LOCAL_WRITE | 1951 IB_ACCESS_REMOTE_WRITE | 1952 IB_ACCESS_REMOTE_READ); 1953 1954 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param); 1955 if (IS_ERR(srp_dev->fmr_pool)) 1956 srp_dev->fmr_pool = NULL; 1957 1958 if (device->node_type == RDMA_NODE_IB_SWITCH) { 1959 s = 0; 1960 e = 0; 1961 } else { 1962 s = 1; 1963 e = device->phys_port_cnt; 1964 } 1965 1966 for (p = s; p <= e; ++p) { 1967 host = srp_add_port(srp_dev, p); 1968 if (host) 1969 list_add_tail(&host->list, &srp_dev->dev_list); 1970 } 1971 1972 ib_set_client_data(device, &srp_client, srp_dev); 1973 1974 goto free_attr; 1975 1976 err_pd: 1977 ib_dealloc_pd(srp_dev->pd); 1978 1979 free_dev: 1980 kfree(srp_dev); 1981 1982 free_attr: 1983 kfree(dev_attr); 1984 } 1985 1986 static void srp_remove_one(struct ib_device *device) 1987 { 1988 struct srp_device *srp_dev; 1989 struct srp_host *host, *tmp_host; 1990 LIST_HEAD(target_list); 1991 struct srp_target_port *target, *tmp_target; 1992 1993 srp_dev = ib_get_client_data(device, &srp_client); 1994 1995 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) { 1996 class_device_unregister(&host->class_dev); 1997 /* 1998 * Wait for the sysfs entry to go away, so that no new 1999 * target ports can be created. 2000 */ 2001 wait_for_completion(&host->released); 2002 2003 /* 2004 * Mark all target ports as removed, so we stop queueing 2005 * commands and don't try to reconnect. 2006 */ 2007 spin_lock(&host->target_lock); 2008 list_for_each_entry(target, &host->target_list, list) { 2009 spin_lock_irq(target->scsi_host->host_lock); 2010 target->state = SRP_TARGET_REMOVED; 2011 spin_unlock_irq(target->scsi_host->host_lock); 2012 } 2013 spin_unlock(&host->target_lock); 2014 2015 /* 2016 * Wait for any reconnection tasks that may have 2017 * started before we marked our target ports as 2018 * removed, and any target port removal tasks. 2019 */ 2020 flush_scheduled_work(); 2021 2022 list_for_each_entry_safe(target, tmp_target, 2023 &host->target_list, list) { 2024 scsi_remove_host(target->scsi_host); 2025 srp_disconnect_target(target); 2026 ib_destroy_cm_id(target->cm_id); 2027 srp_free_target_ib(target); 2028 scsi_host_put(target->scsi_host); 2029 } 2030 2031 kfree(host); 2032 } 2033 2034 if (srp_dev->fmr_pool) 2035 ib_destroy_fmr_pool(srp_dev->fmr_pool); 2036 ib_dereg_mr(srp_dev->mr); 2037 ib_dealloc_pd(srp_dev->pd); 2038 2039 kfree(srp_dev); 2040 } 2041 2042 static int __init srp_init_module(void) 2043 { 2044 int ret; 2045 2046 srp_template.sg_tablesize = srp_sg_tablesize; 2047 srp_max_iu_len = (sizeof (struct srp_cmd) + 2048 sizeof (struct srp_indirect_buf) + 2049 srp_sg_tablesize * 16); 2050 2051 ret = class_register(&srp_class); 2052 if (ret) { 2053 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n"); 2054 return ret; 2055 } 2056 2057 ib_sa_register_client(&srp_sa_client); 2058 2059 ret = ib_register_client(&srp_client); 2060 if (ret) { 2061 printk(KERN_ERR PFX "couldn't register IB client\n"); 2062 ib_sa_unregister_client(&srp_sa_client); 2063 class_unregister(&srp_class); 2064 return ret; 2065 } 2066 2067 return 0; 2068 } 2069 2070 static void __exit srp_cleanup_module(void) 2071 { 2072 ib_unregister_client(&srp_client); 2073 ib_sa_unregister_client(&srp_sa_client); 2074 class_unregister(&srp_class); 2075 } 2076 2077 module_init(srp_init_module); 2078 module_exit(srp_cleanup_module); 2079