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/scsi_tcq.h> 50 #include <scsi/srp.h> 51 #include <scsi/scsi_transport_srp.h> 52 53 #include "ib_srp.h" 54 55 #define DRV_NAME "ib_srp" 56 #define PFX DRV_NAME ": " 57 #define DRV_VERSION "1.0" 58 #define DRV_RELDATE "July 1, 2013" 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 unsigned int srp_sg_tablesize; 66 static unsigned int cmd_sg_entries; 67 static unsigned int indirect_sg_entries; 68 static bool allow_ext_sg; 69 static int topspin_workarounds = 1; 70 71 module_param(srp_sg_tablesize, uint, 0444); 72 MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries"); 73 74 module_param(cmd_sg_entries, uint, 0444); 75 MODULE_PARM_DESC(cmd_sg_entries, 76 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)"); 77 78 module_param(indirect_sg_entries, uint, 0444); 79 MODULE_PARM_DESC(indirect_sg_entries, 80 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")"); 81 82 module_param(allow_ext_sg, bool, 0444); 83 MODULE_PARM_DESC(allow_ext_sg, 84 "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)"); 85 86 module_param(topspin_workarounds, int, 0444); 87 MODULE_PARM_DESC(topspin_workarounds, 88 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0"); 89 90 static struct kernel_param_ops srp_tmo_ops; 91 92 static int srp_reconnect_delay = 10; 93 module_param_cb(reconnect_delay, &srp_tmo_ops, &srp_reconnect_delay, 94 S_IRUGO | S_IWUSR); 95 MODULE_PARM_DESC(reconnect_delay, "Time between successive reconnect attempts"); 96 97 static int srp_fast_io_fail_tmo = 15; 98 module_param_cb(fast_io_fail_tmo, &srp_tmo_ops, &srp_fast_io_fail_tmo, 99 S_IRUGO | S_IWUSR); 100 MODULE_PARM_DESC(fast_io_fail_tmo, 101 "Number of seconds between the observation of a transport" 102 " layer error and failing all I/O. \"off\" means that this" 103 " functionality is disabled."); 104 105 static int srp_dev_loss_tmo = 600; 106 module_param_cb(dev_loss_tmo, &srp_tmo_ops, &srp_dev_loss_tmo, 107 S_IRUGO | S_IWUSR); 108 MODULE_PARM_DESC(dev_loss_tmo, 109 "Maximum number of seconds that the SRP transport should" 110 " insulate transport layer errors. After this time has been" 111 " exceeded the SCSI host is removed. Should be" 112 " between 1 and " __stringify(SCSI_DEVICE_BLOCK_MAX_TIMEOUT) 113 " if fast_io_fail_tmo has not been set. \"off\" means that" 114 " this functionality is disabled."); 115 116 static void srp_add_one(struct ib_device *device); 117 static void srp_remove_one(struct ib_device *device); 118 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr); 119 static void srp_send_completion(struct ib_cq *cq, void *target_ptr); 120 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event); 121 122 static struct scsi_transport_template *ib_srp_transport_template; 123 124 static struct ib_client srp_client = { 125 .name = "srp", 126 .add = srp_add_one, 127 .remove = srp_remove_one 128 }; 129 130 static struct ib_sa_client srp_sa_client; 131 132 static int srp_tmo_get(char *buffer, const struct kernel_param *kp) 133 { 134 int tmo = *(int *)kp->arg; 135 136 if (tmo >= 0) 137 return sprintf(buffer, "%d", tmo); 138 else 139 return sprintf(buffer, "off"); 140 } 141 142 static int srp_tmo_set(const char *val, const struct kernel_param *kp) 143 { 144 int tmo, res; 145 146 if (strncmp(val, "off", 3) != 0) { 147 res = kstrtoint(val, 0, &tmo); 148 if (res) 149 goto out; 150 } else { 151 tmo = -1; 152 } 153 if (kp->arg == &srp_reconnect_delay) 154 res = srp_tmo_valid(tmo, srp_fast_io_fail_tmo, 155 srp_dev_loss_tmo); 156 else if (kp->arg == &srp_fast_io_fail_tmo) 157 res = srp_tmo_valid(srp_reconnect_delay, tmo, srp_dev_loss_tmo); 158 else 159 res = srp_tmo_valid(srp_reconnect_delay, srp_fast_io_fail_tmo, 160 tmo); 161 if (res) 162 goto out; 163 *(int *)kp->arg = tmo; 164 165 out: 166 return res; 167 } 168 169 static struct kernel_param_ops srp_tmo_ops = { 170 .get = srp_tmo_get, 171 .set = srp_tmo_set, 172 }; 173 174 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host) 175 { 176 return (struct srp_target_port *) host->hostdata; 177 } 178 179 static const char *srp_target_info(struct Scsi_Host *host) 180 { 181 return host_to_target(host)->target_name; 182 } 183 184 static int srp_target_is_topspin(struct srp_target_port *target) 185 { 186 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad }; 187 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d }; 188 189 return topspin_workarounds && 190 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) || 191 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui)); 192 } 193 194 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size, 195 gfp_t gfp_mask, 196 enum dma_data_direction direction) 197 { 198 struct srp_iu *iu; 199 200 iu = kmalloc(sizeof *iu, gfp_mask); 201 if (!iu) 202 goto out; 203 204 iu->buf = kzalloc(size, gfp_mask); 205 if (!iu->buf) 206 goto out_free_iu; 207 208 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size, 209 direction); 210 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma)) 211 goto out_free_buf; 212 213 iu->size = size; 214 iu->direction = direction; 215 216 return iu; 217 218 out_free_buf: 219 kfree(iu->buf); 220 out_free_iu: 221 kfree(iu); 222 out: 223 return NULL; 224 } 225 226 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu) 227 { 228 if (!iu) 229 return; 230 231 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size, 232 iu->direction); 233 kfree(iu->buf); 234 kfree(iu); 235 } 236 237 static void srp_qp_event(struct ib_event *event, void *context) 238 { 239 pr_debug("QP event %d\n", event->event); 240 } 241 242 static int srp_init_qp(struct srp_target_port *target, 243 struct ib_qp *qp) 244 { 245 struct ib_qp_attr *attr; 246 int ret; 247 248 attr = kmalloc(sizeof *attr, GFP_KERNEL); 249 if (!attr) 250 return -ENOMEM; 251 252 ret = ib_find_pkey(target->srp_host->srp_dev->dev, 253 target->srp_host->port, 254 be16_to_cpu(target->path.pkey), 255 &attr->pkey_index); 256 if (ret) 257 goto out; 258 259 attr->qp_state = IB_QPS_INIT; 260 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ | 261 IB_ACCESS_REMOTE_WRITE); 262 attr->port_num = target->srp_host->port; 263 264 ret = ib_modify_qp(qp, attr, 265 IB_QP_STATE | 266 IB_QP_PKEY_INDEX | 267 IB_QP_ACCESS_FLAGS | 268 IB_QP_PORT); 269 270 out: 271 kfree(attr); 272 return ret; 273 } 274 275 static int srp_new_cm_id(struct srp_target_port *target) 276 { 277 struct ib_cm_id *new_cm_id; 278 279 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev, 280 srp_cm_handler, target); 281 if (IS_ERR(new_cm_id)) 282 return PTR_ERR(new_cm_id); 283 284 if (target->cm_id) 285 ib_destroy_cm_id(target->cm_id); 286 target->cm_id = new_cm_id; 287 288 return 0; 289 } 290 291 static int srp_create_target_ib(struct srp_target_port *target) 292 { 293 struct ib_qp_init_attr *init_attr; 294 struct ib_cq *recv_cq, *send_cq; 295 struct ib_qp *qp; 296 int ret; 297 298 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL); 299 if (!init_attr) 300 return -ENOMEM; 301 302 recv_cq = ib_create_cq(target->srp_host->srp_dev->dev, 303 srp_recv_completion, NULL, target, 304 target->queue_size, target->comp_vector); 305 if (IS_ERR(recv_cq)) { 306 ret = PTR_ERR(recv_cq); 307 goto err; 308 } 309 310 send_cq = ib_create_cq(target->srp_host->srp_dev->dev, 311 srp_send_completion, NULL, target, 312 target->queue_size, target->comp_vector); 313 if (IS_ERR(send_cq)) { 314 ret = PTR_ERR(send_cq); 315 goto err_recv_cq; 316 } 317 318 ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP); 319 320 init_attr->event_handler = srp_qp_event; 321 init_attr->cap.max_send_wr = target->queue_size; 322 init_attr->cap.max_recv_wr = target->queue_size; 323 init_attr->cap.max_recv_sge = 1; 324 init_attr->cap.max_send_sge = 1; 325 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR; 326 init_attr->qp_type = IB_QPT_RC; 327 init_attr->send_cq = send_cq; 328 init_attr->recv_cq = recv_cq; 329 330 qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr); 331 if (IS_ERR(qp)) { 332 ret = PTR_ERR(qp); 333 goto err_send_cq; 334 } 335 336 ret = srp_init_qp(target, qp); 337 if (ret) 338 goto err_qp; 339 340 if (target->qp) 341 ib_destroy_qp(target->qp); 342 if (target->recv_cq) 343 ib_destroy_cq(target->recv_cq); 344 if (target->send_cq) 345 ib_destroy_cq(target->send_cq); 346 347 target->qp = qp; 348 target->recv_cq = recv_cq; 349 target->send_cq = send_cq; 350 351 kfree(init_attr); 352 return 0; 353 354 err_qp: 355 ib_destroy_qp(qp); 356 357 err_send_cq: 358 ib_destroy_cq(send_cq); 359 360 err_recv_cq: 361 ib_destroy_cq(recv_cq); 362 363 err: 364 kfree(init_attr); 365 return ret; 366 } 367 368 /* 369 * Note: this function may be called without srp_alloc_iu_bufs() having been 370 * invoked. Hence the target->[rt]x_ring checks. 371 */ 372 static void srp_free_target_ib(struct srp_target_port *target) 373 { 374 int i; 375 376 ib_destroy_qp(target->qp); 377 ib_destroy_cq(target->send_cq); 378 ib_destroy_cq(target->recv_cq); 379 380 target->qp = NULL; 381 target->send_cq = target->recv_cq = NULL; 382 383 if (target->rx_ring) { 384 for (i = 0; i < target->queue_size; ++i) 385 srp_free_iu(target->srp_host, target->rx_ring[i]); 386 kfree(target->rx_ring); 387 target->rx_ring = NULL; 388 } 389 if (target->tx_ring) { 390 for (i = 0; i < target->queue_size; ++i) 391 srp_free_iu(target->srp_host, target->tx_ring[i]); 392 kfree(target->tx_ring); 393 target->tx_ring = NULL; 394 } 395 } 396 397 static void srp_path_rec_completion(int status, 398 struct ib_sa_path_rec *pathrec, 399 void *target_ptr) 400 { 401 struct srp_target_port *target = target_ptr; 402 403 target->status = status; 404 if (status) 405 shost_printk(KERN_ERR, target->scsi_host, 406 PFX "Got failed path rec status %d\n", status); 407 else 408 target->path = *pathrec; 409 complete(&target->done); 410 } 411 412 static int srp_lookup_path(struct srp_target_port *target) 413 { 414 target->path.numb_path = 1; 415 416 init_completion(&target->done); 417 418 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client, 419 target->srp_host->srp_dev->dev, 420 target->srp_host->port, 421 &target->path, 422 IB_SA_PATH_REC_SERVICE_ID | 423 IB_SA_PATH_REC_DGID | 424 IB_SA_PATH_REC_SGID | 425 IB_SA_PATH_REC_NUMB_PATH | 426 IB_SA_PATH_REC_PKEY, 427 SRP_PATH_REC_TIMEOUT_MS, 428 GFP_KERNEL, 429 srp_path_rec_completion, 430 target, &target->path_query); 431 if (target->path_query_id < 0) 432 return target->path_query_id; 433 434 wait_for_completion(&target->done); 435 436 if (target->status < 0) 437 shost_printk(KERN_WARNING, target->scsi_host, 438 PFX "Path record query failed\n"); 439 440 return target->status; 441 } 442 443 static int srp_send_req(struct srp_target_port *target) 444 { 445 struct { 446 struct ib_cm_req_param param; 447 struct srp_login_req priv; 448 } *req = NULL; 449 int status; 450 451 req = kzalloc(sizeof *req, GFP_KERNEL); 452 if (!req) 453 return -ENOMEM; 454 455 req->param.primary_path = &target->path; 456 req->param.alternate_path = NULL; 457 req->param.service_id = target->service_id; 458 req->param.qp_num = target->qp->qp_num; 459 req->param.qp_type = target->qp->qp_type; 460 req->param.private_data = &req->priv; 461 req->param.private_data_len = sizeof req->priv; 462 req->param.flow_control = 1; 463 464 get_random_bytes(&req->param.starting_psn, 4); 465 req->param.starting_psn &= 0xffffff; 466 467 /* 468 * Pick some arbitrary defaults here; we could make these 469 * module parameters if anyone cared about setting them. 470 */ 471 req->param.responder_resources = 4; 472 req->param.remote_cm_response_timeout = 20; 473 req->param.local_cm_response_timeout = 20; 474 req->param.retry_count = target->tl_retry_count; 475 req->param.rnr_retry_count = 7; 476 req->param.max_cm_retries = 15; 477 478 req->priv.opcode = SRP_LOGIN_REQ; 479 req->priv.tag = 0; 480 req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len); 481 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | 482 SRP_BUF_FORMAT_INDIRECT); 483 /* 484 * In the published SRP specification (draft rev. 16a), the 485 * port identifier format is 8 bytes of ID extension followed 486 * by 8 bytes of GUID. Older drafts put the two halves in the 487 * opposite order, so that the GUID comes first. 488 * 489 * Targets conforming to these obsolete drafts can be 490 * recognized by the I/O Class they report. 491 */ 492 if (target->io_class == SRP_REV10_IB_IO_CLASS) { 493 memcpy(req->priv.initiator_port_id, 494 &target->path.sgid.global.interface_id, 8); 495 memcpy(req->priv.initiator_port_id + 8, 496 &target->initiator_ext, 8); 497 memcpy(req->priv.target_port_id, &target->ioc_guid, 8); 498 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8); 499 } else { 500 memcpy(req->priv.initiator_port_id, 501 &target->initiator_ext, 8); 502 memcpy(req->priv.initiator_port_id + 8, 503 &target->path.sgid.global.interface_id, 8); 504 memcpy(req->priv.target_port_id, &target->id_ext, 8); 505 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8); 506 } 507 508 /* 509 * Topspin/Cisco SRP targets will reject our login unless we 510 * zero out the first 8 bytes of our initiator port ID and set 511 * the second 8 bytes to the local node GUID. 512 */ 513 if (srp_target_is_topspin(target)) { 514 shost_printk(KERN_DEBUG, target->scsi_host, 515 PFX "Topspin/Cisco initiator port ID workaround " 516 "activated for target GUID %016llx\n", 517 (unsigned long long) be64_to_cpu(target->ioc_guid)); 518 memset(req->priv.initiator_port_id, 0, 8); 519 memcpy(req->priv.initiator_port_id + 8, 520 &target->srp_host->srp_dev->dev->node_guid, 8); 521 } 522 523 status = ib_send_cm_req(target->cm_id, &req->param); 524 525 kfree(req); 526 527 return status; 528 } 529 530 static bool srp_queue_remove_work(struct srp_target_port *target) 531 { 532 bool changed = false; 533 534 spin_lock_irq(&target->lock); 535 if (target->state != SRP_TARGET_REMOVED) { 536 target->state = SRP_TARGET_REMOVED; 537 changed = true; 538 } 539 spin_unlock_irq(&target->lock); 540 541 if (changed) 542 queue_work(system_long_wq, &target->remove_work); 543 544 return changed; 545 } 546 547 static bool srp_change_conn_state(struct srp_target_port *target, 548 bool connected) 549 { 550 bool changed = false; 551 552 spin_lock_irq(&target->lock); 553 if (target->connected != connected) { 554 target->connected = connected; 555 changed = true; 556 } 557 spin_unlock_irq(&target->lock); 558 559 return changed; 560 } 561 562 static void srp_disconnect_target(struct srp_target_port *target) 563 { 564 if (srp_change_conn_state(target, false)) { 565 /* XXX should send SRP_I_LOGOUT request */ 566 567 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) { 568 shost_printk(KERN_DEBUG, target->scsi_host, 569 PFX "Sending CM DREQ failed\n"); 570 } 571 } 572 } 573 574 static void srp_free_req_data(struct srp_target_port *target) 575 { 576 struct ib_device *ibdev = target->srp_host->srp_dev->dev; 577 struct srp_request *req; 578 int i; 579 580 if (!target->req_ring) 581 return; 582 583 for (i = 0; i < target->req_ring_size; ++i) { 584 req = &target->req_ring[i]; 585 kfree(req->fmr_list); 586 kfree(req->map_page); 587 if (req->indirect_dma_addr) { 588 ib_dma_unmap_single(ibdev, req->indirect_dma_addr, 589 target->indirect_size, 590 DMA_TO_DEVICE); 591 } 592 kfree(req->indirect_desc); 593 } 594 595 kfree(target->req_ring); 596 target->req_ring = NULL; 597 } 598 599 static int srp_alloc_req_data(struct srp_target_port *target) 600 { 601 struct srp_device *srp_dev = target->srp_host->srp_dev; 602 struct ib_device *ibdev = srp_dev->dev; 603 struct srp_request *req; 604 dma_addr_t dma_addr; 605 int i, ret = -ENOMEM; 606 607 INIT_LIST_HEAD(&target->free_reqs); 608 609 target->req_ring = kzalloc(target->req_ring_size * 610 sizeof(*target->req_ring), GFP_KERNEL); 611 if (!target->req_ring) 612 goto out; 613 614 for (i = 0; i < target->req_ring_size; ++i) { 615 req = &target->req_ring[i]; 616 req->fmr_list = kmalloc(target->cmd_sg_cnt * sizeof(void *), 617 GFP_KERNEL); 618 req->map_page = kmalloc(SRP_FMR_SIZE * sizeof(void *), 619 GFP_KERNEL); 620 req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL); 621 if (!req->fmr_list || !req->map_page || !req->indirect_desc) 622 goto out; 623 624 dma_addr = ib_dma_map_single(ibdev, req->indirect_desc, 625 target->indirect_size, 626 DMA_TO_DEVICE); 627 if (ib_dma_mapping_error(ibdev, dma_addr)) 628 goto out; 629 630 req->indirect_dma_addr = dma_addr; 631 req->index = i; 632 list_add_tail(&req->list, &target->free_reqs); 633 } 634 ret = 0; 635 636 out: 637 return ret; 638 } 639 640 /** 641 * srp_del_scsi_host_attr() - Remove attributes defined in the host template. 642 * @shost: SCSI host whose attributes to remove from sysfs. 643 * 644 * Note: Any attributes defined in the host template and that did not exist 645 * before invocation of this function will be ignored. 646 */ 647 static void srp_del_scsi_host_attr(struct Scsi_Host *shost) 648 { 649 struct device_attribute **attr; 650 651 for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr) 652 device_remove_file(&shost->shost_dev, *attr); 653 } 654 655 static void srp_remove_target(struct srp_target_port *target) 656 { 657 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED); 658 659 srp_del_scsi_host_attr(target->scsi_host); 660 srp_rport_get(target->rport); 661 srp_remove_host(target->scsi_host); 662 scsi_remove_host(target->scsi_host); 663 srp_stop_rport_timers(target->rport); 664 srp_disconnect_target(target); 665 ib_destroy_cm_id(target->cm_id); 666 srp_free_target_ib(target); 667 cancel_work_sync(&target->tl_err_work); 668 srp_rport_put(target->rport); 669 srp_free_req_data(target); 670 671 spin_lock(&target->srp_host->target_lock); 672 list_del(&target->list); 673 spin_unlock(&target->srp_host->target_lock); 674 675 scsi_host_put(target->scsi_host); 676 } 677 678 static void srp_remove_work(struct work_struct *work) 679 { 680 struct srp_target_port *target = 681 container_of(work, struct srp_target_port, remove_work); 682 683 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED); 684 685 srp_remove_target(target); 686 } 687 688 static void srp_rport_delete(struct srp_rport *rport) 689 { 690 struct srp_target_port *target = rport->lld_data; 691 692 srp_queue_remove_work(target); 693 } 694 695 static int srp_connect_target(struct srp_target_port *target) 696 { 697 int retries = 3; 698 int ret; 699 700 WARN_ON_ONCE(target->connected); 701 702 target->qp_in_error = false; 703 704 ret = srp_lookup_path(target); 705 if (ret) 706 return ret; 707 708 while (1) { 709 init_completion(&target->done); 710 ret = srp_send_req(target); 711 if (ret) 712 return ret; 713 wait_for_completion(&target->done); 714 715 /* 716 * The CM event handling code will set status to 717 * SRP_PORT_REDIRECT if we get a port redirect REJ 718 * back, or SRP_DLID_REDIRECT if we get a lid/qp 719 * redirect REJ back. 720 */ 721 switch (target->status) { 722 case 0: 723 srp_change_conn_state(target, true); 724 return 0; 725 726 case SRP_PORT_REDIRECT: 727 ret = srp_lookup_path(target); 728 if (ret) 729 return ret; 730 break; 731 732 case SRP_DLID_REDIRECT: 733 break; 734 735 case SRP_STALE_CONN: 736 /* Our current CM id was stale, and is now in timewait. 737 * Try to reconnect with a new one. 738 */ 739 if (!retries-- || srp_new_cm_id(target)) { 740 shost_printk(KERN_ERR, target->scsi_host, PFX 741 "giving up on stale connection\n"); 742 target->status = -ECONNRESET; 743 return target->status; 744 } 745 746 shost_printk(KERN_ERR, target->scsi_host, PFX 747 "retrying stale connection\n"); 748 break; 749 750 default: 751 return target->status; 752 } 753 } 754 } 755 756 static void srp_unmap_data(struct scsi_cmnd *scmnd, 757 struct srp_target_port *target, 758 struct srp_request *req) 759 { 760 struct ib_device *ibdev = target->srp_host->srp_dev->dev; 761 struct ib_pool_fmr **pfmr; 762 763 if (!scsi_sglist(scmnd) || 764 (scmnd->sc_data_direction != DMA_TO_DEVICE && 765 scmnd->sc_data_direction != DMA_FROM_DEVICE)) 766 return; 767 768 pfmr = req->fmr_list; 769 while (req->nfmr--) 770 ib_fmr_pool_unmap(*pfmr++); 771 772 ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd), 773 scmnd->sc_data_direction); 774 } 775 776 /** 777 * srp_claim_req - Take ownership of the scmnd associated with a request. 778 * @target: SRP target port. 779 * @req: SRP request. 780 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take 781 * ownership of @req->scmnd if it equals @scmnd. 782 * 783 * Return value: 784 * Either NULL or a pointer to the SCSI command the caller became owner of. 785 */ 786 static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target, 787 struct srp_request *req, 788 struct scsi_cmnd *scmnd) 789 { 790 unsigned long flags; 791 792 spin_lock_irqsave(&target->lock, flags); 793 if (!scmnd) { 794 scmnd = req->scmnd; 795 req->scmnd = NULL; 796 } else if (req->scmnd == scmnd) { 797 req->scmnd = NULL; 798 } else { 799 scmnd = NULL; 800 } 801 spin_unlock_irqrestore(&target->lock, flags); 802 803 return scmnd; 804 } 805 806 /** 807 * srp_free_req() - Unmap data and add request to the free request list. 808 */ 809 static void srp_free_req(struct srp_target_port *target, 810 struct srp_request *req, struct scsi_cmnd *scmnd, 811 s32 req_lim_delta) 812 { 813 unsigned long flags; 814 815 srp_unmap_data(scmnd, target, req); 816 817 spin_lock_irqsave(&target->lock, flags); 818 target->req_lim += req_lim_delta; 819 list_add_tail(&req->list, &target->free_reqs); 820 spin_unlock_irqrestore(&target->lock, flags); 821 } 822 823 static void srp_finish_req(struct srp_target_port *target, 824 struct srp_request *req, int result) 825 { 826 struct scsi_cmnd *scmnd = srp_claim_req(target, req, NULL); 827 828 if (scmnd) { 829 srp_free_req(target, req, scmnd, 0); 830 scmnd->result = result; 831 scmnd->scsi_done(scmnd); 832 } 833 } 834 835 static void srp_terminate_io(struct srp_rport *rport) 836 { 837 struct srp_target_port *target = rport->lld_data; 838 int i; 839 840 for (i = 0; i < target->req_ring_size; ++i) { 841 struct srp_request *req = &target->req_ring[i]; 842 srp_finish_req(target, req, DID_TRANSPORT_FAILFAST << 16); 843 } 844 } 845 846 /* 847 * It is up to the caller to ensure that srp_rport_reconnect() calls are 848 * serialized and that no concurrent srp_queuecommand(), srp_abort(), 849 * srp_reset_device() or srp_reset_host() calls will occur while this function 850 * is in progress. One way to realize that is not to call this function 851 * directly but to call srp_reconnect_rport() instead since that last function 852 * serializes calls of this function via rport->mutex and also blocks 853 * srp_queuecommand() calls before invoking this function. 854 */ 855 static int srp_rport_reconnect(struct srp_rport *rport) 856 { 857 struct srp_target_port *target = rport->lld_data; 858 int i, ret; 859 860 srp_disconnect_target(target); 861 /* 862 * Now get a new local CM ID so that we avoid confusing the target in 863 * case things are really fouled up. Doing so also ensures that all CM 864 * callbacks will have finished before a new QP is allocated. 865 */ 866 ret = srp_new_cm_id(target); 867 /* 868 * Whether or not creating a new CM ID succeeded, create a new 869 * QP. This guarantees that all completion callback function 870 * invocations have finished before request resetting starts. 871 */ 872 if (ret == 0) 873 ret = srp_create_target_ib(target); 874 else 875 srp_create_target_ib(target); 876 877 for (i = 0; i < target->req_ring_size; ++i) { 878 struct srp_request *req = &target->req_ring[i]; 879 srp_finish_req(target, req, DID_RESET << 16); 880 } 881 882 INIT_LIST_HEAD(&target->free_tx); 883 for (i = 0; i < target->queue_size; ++i) 884 list_add(&target->tx_ring[i]->list, &target->free_tx); 885 886 if (ret == 0) 887 ret = srp_connect_target(target); 888 889 if (ret == 0) 890 shost_printk(KERN_INFO, target->scsi_host, 891 PFX "reconnect succeeded\n"); 892 893 return ret; 894 } 895 896 static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr, 897 unsigned int dma_len, u32 rkey) 898 { 899 struct srp_direct_buf *desc = state->desc; 900 901 desc->va = cpu_to_be64(dma_addr); 902 desc->key = cpu_to_be32(rkey); 903 desc->len = cpu_to_be32(dma_len); 904 905 state->total_len += dma_len; 906 state->desc++; 907 state->ndesc++; 908 } 909 910 static int srp_map_finish_fmr(struct srp_map_state *state, 911 struct srp_target_port *target) 912 { 913 struct srp_device *dev = target->srp_host->srp_dev; 914 struct ib_pool_fmr *fmr; 915 u64 io_addr = 0; 916 917 if (!state->npages) 918 return 0; 919 920 if (state->npages == 1) { 921 srp_map_desc(state, state->base_dma_addr, state->fmr_len, 922 target->rkey); 923 state->npages = state->fmr_len = 0; 924 return 0; 925 } 926 927 fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages, 928 state->npages, io_addr); 929 if (IS_ERR(fmr)) 930 return PTR_ERR(fmr); 931 932 *state->next_fmr++ = fmr; 933 state->nfmr++; 934 935 srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey); 936 state->npages = state->fmr_len = 0; 937 return 0; 938 } 939 940 static void srp_map_update_start(struct srp_map_state *state, 941 struct scatterlist *sg, int sg_index, 942 dma_addr_t dma_addr) 943 { 944 state->unmapped_sg = sg; 945 state->unmapped_index = sg_index; 946 state->unmapped_addr = dma_addr; 947 } 948 949 static int srp_map_sg_entry(struct srp_map_state *state, 950 struct srp_target_port *target, 951 struct scatterlist *sg, int sg_index, 952 int use_fmr) 953 { 954 struct srp_device *dev = target->srp_host->srp_dev; 955 struct ib_device *ibdev = dev->dev; 956 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg); 957 unsigned int dma_len = ib_sg_dma_len(ibdev, sg); 958 unsigned int len; 959 int ret; 960 961 if (!dma_len) 962 return 0; 963 964 if (use_fmr == SRP_MAP_NO_FMR) { 965 /* Once we're in direct map mode for a request, we don't 966 * go back to FMR mode, so no need to update anything 967 * other than the descriptor. 968 */ 969 srp_map_desc(state, dma_addr, dma_len, target->rkey); 970 return 0; 971 } 972 973 /* If we start at an offset into the FMR page, don't merge into 974 * the current FMR. Finish it out, and use the kernel's MR for this 975 * sg entry. This is to avoid potential bugs on some SRP targets 976 * that were never quite defined, but went away when the initiator 977 * avoided using FMR on such page fragments. 978 */ 979 if (dma_addr & ~dev->fmr_page_mask || dma_len > dev->fmr_max_size) { 980 ret = srp_map_finish_fmr(state, target); 981 if (ret) 982 return ret; 983 984 srp_map_desc(state, dma_addr, dma_len, target->rkey); 985 srp_map_update_start(state, NULL, 0, 0); 986 return 0; 987 } 988 989 /* If this is the first sg to go into the FMR, save our position. 990 * We need to know the first unmapped entry, its index, and the 991 * first unmapped address within that entry to be able to restart 992 * mapping after an error. 993 */ 994 if (!state->unmapped_sg) 995 srp_map_update_start(state, sg, sg_index, dma_addr); 996 997 while (dma_len) { 998 if (state->npages == SRP_FMR_SIZE) { 999 ret = srp_map_finish_fmr(state, target); 1000 if (ret) 1001 return ret; 1002 1003 srp_map_update_start(state, sg, sg_index, dma_addr); 1004 } 1005 1006 len = min_t(unsigned int, dma_len, dev->fmr_page_size); 1007 1008 if (!state->npages) 1009 state->base_dma_addr = dma_addr; 1010 state->pages[state->npages++] = dma_addr; 1011 state->fmr_len += len; 1012 dma_addr += len; 1013 dma_len -= len; 1014 } 1015 1016 /* If the last entry of the FMR wasn't a full page, then we need to 1017 * close it out and start a new one -- we can only merge at page 1018 * boundries. 1019 */ 1020 ret = 0; 1021 if (len != dev->fmr_page_size) { 1022 ret = srp_map_finish_fmr(state, target); 1023 if (!ret) 1024 srp_map_update_start(state, NULL, 0, 0); 1025 } 1026 return ret; 1027 } 1028 1029 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target, 1030 struct srp_request *req) 1031 { 1032 struct scatterlist *scat, *sg; 1033 struct srp_cmd *cmd = req->cmd->buf; 1034 int i, len, nents, count, use_fmr; 1035 struct srp_device *dev; 1036 struct ib_device *ibdev; 1037 struct srp_map_state state; 1038 struct srp_indirect_buf *indirect_hdr; 1039 u32 table_len; 1040 u8 fmt; 1041 1042 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE) 1043 return sizeof (struct srp_cmd); 1044 1045 if (scmnd->sc_data_direction != DMA_FROM_DEVICE && 1046 scmnd->sc_data_direction != DMA_TO_DEVICE) { 1047 shost_printk(KERN_WARNING, target->scsi_host, 1048 PFX "Unhandled data direction %d\n", 1049 scmnd->sc_data_direction); 1050 return -EINVAL; 1051 } 1052 1053 nents = scsi_sg_count(scmnd); 1054 scat = scsi_sglist(scmnd); 1055 1056 dev = target->srp_host->srp_dev; 1057 ibdev = dev->dev; 1058 1059 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction); 1060 if (unlikely(count == 0)) 1061 return -EIO; 1062 1063 fmt = SRP_DATA_DESC_DIRECT; 1064 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf); 1065 1066 if (count == 1) { 1067 /* 1068 * The midlayer only generated a single gather/scatter 1069 * entry, or DMA mapping coalesced everything to a 1070 * single entry. So a direct descriptor along with 1071 * the DMA MR suffices. 1072 */ 1073 struct srp_direct_buf *buf = (void *) cmd->add_data; 1074 1075 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat)); 1076 buf->key = cpu_to_be32(target->rkey); 1077 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat)); 1078 1079 req->nfmr = 0; 1080 goto map_complete; 1081 } 1082 1083 /* We have more than one scatter/gather entry, so build our indirect 1084 * descriptor table, trying to merge as many entries with FMR as we 1085 * can. 1086 */ 1087 indirect_hdr = (void *) cmd->add_data; 1088 1089 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr, 1090 target->indirect_size, DMA_TO_DEVICE); 1091 1092 memset(&state, 0, sizeof(state)); 1093 state.desc = req->indirect_desc; 1094 state.pages = req->map_page; 1095 state.next_fmr = req->fmr_list; 1096 1097 use_fmr = dev->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR; 1098 1099 for_each_sg(scat, sg, count, i) { 1100 if (srp_map_sg_entry(&state, target, sg, i, use_fmr)) { 1101 /* FMR mapping failed, so backtrack to the first 1102 * unmapped entry and continue on without using FMR. 1103 */ 1104 dma_addr_t dma_addr; 1105 unsigned int dma_len; 1106 1107 backtrack: 1108 sg = state.unmapped_sg; 1109 i = state.unmapped_index; 1110 1111 dma_addr = ib_sg_dma_address(ibdev, sg); 1112 dma_len = ib_sg_dma_len(ibdev, sg); 1113 dma_len -= (state.unmapped_addr - dma_addr); 1114 dma_addr = state.unmapped_addr; 1115 use_fmr = SRP_MAP_NO_FMR; 1116 srp_map_desc(&state, dma_addr, dma_len, target->rkey); 1117 } 1118 } 1119 1120 if (use_fmr == SRP_MAP_ALLOW_FMR && srp_map_finish_fmr(&state, target)) 1121 goto backtrack; 1122 1123 /* We've mapped the request, now pull as much of the indirect 1124 * descriptor table as we can into the command buffer. If this 1125 * target is not using an external indirect table, we are 1126 * guaranteed to fit into the command, as the SCSI layer won't 1127 * give us more S/G entries than we allow. 1128 */ 1129 req->nfmr = state.nfmr; 1130 if (state.ndesc == 1) { 1131 /* FMR mapping was able to collapse this to one entry, 1132 * so use a direct descriptor. 1133 */ 1134 struct srp_direct_buf *buf = (void *) cmd->add_data; 1135 1136 *buf = req->indirect_desc[0]; 1137 goto map_complete; 1138 } 1139 1140 if (unlikely(target->cmd_sg_cnt < state.ndesc && 1141 !target->allow_ext_sg)) { 1142 shost_printk(KERN_ERR, target->scsi_host, 1143 "Could not fit S/G list into SRP_CMD\n"); 1144 return -EIO; 1145 } 1146 1147 count = min(state.ndesc, target->cmd_sg_cnt); 1148 table_len = state.ndesc * sizeof (struct srp_direct_buf); 1149 1150 fmt = SRP_DATA_DESC_INDIRECT; 1151 len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf); 1152 len += count * sizeof (struct srp_direct_buf); 1153 1154 memcpy(indirect_hdr->desc_list, req->indirect_desc, 1155 count * sizeof (struct srp_direct_buf)); 1156 1157 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr); 1158 indirect_hdr->table_desc.key = cpu_to_be32(target->rkey); 1159 indirect_hdr->table_desc.len = cpu_to_be32(table_len); 1160 indirect_hdr->len = cpu_to_be32(state.total_len); 1161 1162 if (scmnd->sc_data_direction == DMA_TO_DEVICE) 1163 cmd->data_out_desc_cnt = count; 1164 else 1165 cmd->data_in_desc_cnt = count; 1166 1167 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len, 1168 DMA_TO_DEVICE); 1169 1170 map_complete: 1171 if (scmnd->sc_data_direction == DMA_TO_DEVICE) 1172 cmd->buf_fmt = fmt << 4; 1173 else 1174 cmd->buf_fmt = fmt; 1175 1176 return len; 1177 } 1178 1179 /* 1180 * Return an IU and possible credit to the free pool 1181 */ 1182 static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu, 1183 enum srp_iu_type iu_type) 1184 { 1185 unsigned long flags; 1186 1187 spin_lock_irqsave(&target->lock, flags); 1188 list_add(&iu->list, &target->free_tx); 1189 if (iu_type != SRP_IU_RSP) 1190 ++target->req_lim; 1191 spin_unlock_irqrestore(&target->lock, flags); 1192 } 1193 1194 /* 1195 * Must be called with target->lock held to protect req_lim and free_tx. 1196 * If IU is not sent, it must be returned using srp_put_tx_iu(). 1197 * 1198 * Note: 1199 * An upper limit for the number of allocated information units for each 1200 * request type is: 1201 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues 1202 * more than Scsi_Host.can_queue requests. 1203 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE. 1204 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than 1205 * one unanswered SRP request to an initiator. 1206 */ 1207 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target, 1208 enum srp_iu_type iu_type) 1209 { 1210 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE; 1211 struct srp_iu *iu; 1212 1213 srp_send_completion(target->send_cq, target); 1214 1215 if (list_empty(&target->free_tx)) 1216 return NULL; 1217 1218 /* Initiator responses to target requests do not consume credits */ 1219 if (iu_type != SRP_IU_RSP) { 1220 if (target->req_lim <= rsv) { 1221 ++target->zero_req_lim; 1222 return NULL; 1223 } 1224 1225 --target->req_lim; 1226 } 1227 1228 iu = list_first_entry(&target->free_tx, struct srp_iu, list); 1229 list_del(&iu->list); 1230 return iu; 1231 } 1232 1233 static int srp_post_send(struct srp_target_port *target, 1234 struct srp_iu *iu, int len) 1235 { 1236 struct ib_sge list; 1237 struct ib_send_wr wr, *bad_wr; 1238 1239 list.addr = iu->dma; 1240 list.length = len; 1241 list.lkey = target->lkey; 1242 1243 wr.next = NULL; 1244 wr.wr_id = (uintptr_t) iu; 1245 wr.sg_list = &list; 1246 wr.num_sge = 1; 1247 wr.opcode = IB_WR_SEND; 1248 wr.send_flags = IB_SEND_SIGNALED; 1249 1250 return ib_post_send(target->qp, &wr, &bad_wr); 1251 } 1252 1253 static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu) 1254 { 1255 struct ib_recv_wr wr, *bad_wr; 1256 struct ib_sge list; 1257 1258 list.addr = iu->dma; 1259 list.length = iu->size; 1260 list.lkey = target->lkey; 1261 1262 wr.next = NULL; 1263 wr.wr_id = (uintptr_t) iu; 1264 wr.sg_list = &list; 1265 wr.num_sge = 1; 1266 1267 return ib_post_recv(target->qp, &wr, &bad_wr); 1268 } 1269 1270 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp) 1271 { 1272 struct srp_request *req; 1273 struct scsi_cmnd *scmnd; 1274 unsigned long flags; 1275 1276 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) { 1277 spin_lock_irqsave(&target->lock, flags); 1278 target->req_lim += be32_to_cpu(rsp->req_lim_delta); 1279 spin_unlock_irqrestore(&target->lock, flags); 1280 1281 target->tsk_mgmt_status = -1; 1282 if (be32_to_cpu(rsp->resp_data_len) >= 4) 1283 target->tsk_mgmt_status = rsp->data[3]; 1284 complete(&target->tsk_mgmt_done); 1285 } else { 1286 req = &target->req_ring[rsp->tag]; 1287 scmnd = srp_claim_req(target, req, NULL); 1288 if (!scmnd) { 1289 shost_printk(KERN_ERR, target->scsi_host, 1290 "Null scmnd for RSP w/tag %016llx\n", 1291 (unsigned long long) rsp->tag); 1292 1293 spin_lock_irqsave(&target->lock, flags); 1294 target->req_lim += be32_to_cpu(rsp->req_lim_delta); 1295 spin_unlock_irqrestore(&target->lock, flags); 1296 1297 return; 1298 } 1299 scmnd->result = rsp->status; 1300 1301 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) { 1302 memcpy(scmnd->sense_buffer, rsp->data + 1303 be32_to_cpu(rsp->resp_data_len), 1304 min_t(int, be32_to_cpu(rsp->sense_data_len), 1305 SCSI_SENSE_BUFFERSIZE)); 1306 } 1307 1308 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER)) 1309 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt)); 1310 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER)) 1311 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt)); 1312 1313 srp_free_req(target, req, scmnd, 1314 be32_to_cpu(rsp->req_lim_delta)); 1315 1316 scmnd->host_scribble = NULL; 1317 scmnd->scsi_done(scmnd); 1318 } 1319 } 1320 1321 static int srp_response_common(struct srp_target_port *target, s32 req_delta, 1322 void *rsp, int len) 1323 { 1324 struct ib_device *dev = target->srp_host->srp_dev->dev; 1325 unsigned long flags; 1326 struct srp_iu *iu; 1327 int err; 1328 1329 spin_lock_irqsave(&target->lock, flags); 1330 target->req_lim += req_delta; 1331 iu = __srp_get_tx_iu(target, SRP_IU_RSP); 1332 spin_unlock_irqrestore(&target->lock, flags); 1333 1334 if (!iu) { 1335 shost_printk(KERN_ERR, target->scsi_host, PFX 1336 "no IU available to send response\n"); 1337 return 1; 1338 } 1339 1340 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE); 1341 memcpy(iu->buf, rsp, len); 1342 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE); 1343 1344 err = srp_post_send(target, iu, len); 1345 if (err) { 1346 shost_printk(KERN_ERR, target->scsi_host, PFX 1347 "unable to post response: %d\n", err); 1348 srp_put_tx_iu(target, iu, SRP_IU_RSP); 1349 } 1350 1351 return err; 1352 } 1353 1354 static void srp_process_cred_req(struct srp_target_port *target, 1355 struct srp_cred_req *req) 1356 { 1357 struct srp_cred_rsp rsp = { 1358 .opcode = SRP_CRED_RSP, 1359 .tag = req->tag, 1360 }; 1361 s32 delta = be32_to_cpu(req->req_lim_delta); 1362 1363 if (srp_response_common(target, delta, &rsp, sizeof rsp)) 1364 shost_printk(KERN_ERR, target->scsi_host, PFX 1365 "problems processing SRP_CRED_REQ\n"); 1366 } 1367 1368 static void srp_process_aer_req(struct srp_target_port *target, 1369 struct srp_aer_req *req) 1370 { 1371 struct srp_aer_rsp rsp = { 1372 .opcode = SRP_AER_RSP, 1373 .tag = req->tag, 1374 }; 1375 s32 delta = be32_to_cpu(req->req_lim_delta); 1376 1377 shost_printk(KERN_ERR, target->scsi_host, PFX 1378 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun)); 1379 1380 if (srp_response_common(target, delta, &rsp, sizeof rsp)) 1381 shost_printk(KERN_ERR, target->scsi_host, PFX 1382 "problems processing SRP_AER_REQ\n"); 1383 } 1384 1385 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc) 1386 { 1387 struct ib_device *dev = target->srp_host->srp_dev->dev; 1388 struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id; 1389 int res; 1390 u8 opcode; 1391 1392 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len, 1393 DMA_FROM_DEVICE); 1394 1395 opcode = *(u8 *) iu->buf; 1396 1397 if (0) { 1398 shost_printk(KERN_ERR, target->scsi_host, 1399 PFX "recv completion, opcode 0x%02x\n", opcode); 1400 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1, 1401 iu->buf, wc->byte_len, true); 1402 } 1403 1404 switch (opcode) { 1405 case SRP_RSP: 1406 srp_process_rsp(target, iu->buf); 1407 break; 1408 1409 case SRP_CRED_REQ: 1410 srp_process_cred_req(target, iu->buf); 1411 break; 1412 1413 case SRP_AER_REQ: 1414 srp_process_aer_req(target, iu->buf); 1415 break; 1416 1417 case SRP_T_LOGOUT: 1418 /* XXX Handle target logout */ 1419 shost_printk(KERN_WARNING, target->scsi_host, 1420 PFX "Got target logout request\n"); 1421 break; 1422 1423 default: 1424 shost_printk(KERN_WARNING, target->scsi_host, 1425 PFX "Unhandled SRP opcode 0x%02x\n", opcode); 1426 break; 1427 } 1428 1429 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len, 1430 DMA_FROM_DEVICE); 1431 1432 res = srp_post_recv(target, iu); 1433 if (res != 0) 1434 shost_printk(KERN_ERR, target->scsi_host, 1435 PFX "Recv failed with error code %d\n", res); 1436 } 1437 1438 /** 1439 * srp_tl_err_work() - handle a transport layer error 1440 * 1441 * Note: This function may get invoked before the rport has been created, 1442 * hence the target->rport test. 1443 */ 1444 static void srp_tl_err_work(struct work_struct *work) 1445 { 1446 struct srp_target_port *target; 1447 1448 target = container_of(work, struct srp_target_port, tl_err_work); 1449 if (target->rport) 1450 srp_start_tl_fail_timers(target->rport); 1451 } 1452 1453 static void srp_handle_qp_err(enum ib_wc_status wc_status, bool send_err, 1454 struct srp_target_port *target) 1455 { 1456 if (target->connected && !target->qp_in_error) { 1457 shost_printk(KERN_ERR, target->scsi_host, 1458 PFX "failed %s status %d\n", 1459 send_err ? "send" : "receive", 1460 wc_status); 1461 queue_work(system_long_wq, &target->tl_err_work); 1462 } 1463 target->qp_in_error = true; 1464 } 1465 1466 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr) 1467 { 1468 struct srp_target_port *target = target_ptr; 1469 struct ib_wc wc; 1470 1471 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); 1472 while (ib_poll_cq(cq, 1, &wc) > 0) { 1473 if (likely(wc.status == IB_WC_SUCCESS)) { 1474 srp_handle_recv(target, &wc); 1475 } else { 1476 srp_handle_qp_err(wc.status, false, target); 1477 } 1478 } 1479 } 1480 1481 static void srp_send_completion(struct ib_cq *cq, void *target_ptr) 1482 { 1483 struct srp_target_port *target = target_ptr; 1484 struct ib_wc wc; 1485 struct srp_iu *iu; 1486 1487 while (ib_poll_cq(cq, 1, &wc) > 0) { 1488 if (likely(wc.status == IB_WC_SUCCESS)) { 1489 iu = (struct srp_iu *) (uintptr_t) wc.wr_id; 1490 list_add(&iu->list, &target->free_tx); 1491 } else { 1492 srp_handle_qp_err(wc.status, true, target); 1493 } 1494 } 1495 } 1496 1497 static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd) 1498 { 1499 struct srp_target_port *target = host_to_target(shost); 1500 struct srp_rport *rport = target->rport; 1501 struct srp_request *req; 1502 struct srp_iu *iu; 1503 struct srp_cmd *cmd; 1504 struct ib_device *dev; 1505 unsigned long flags; 1506 int len, result; 1507 const bool in_scsi_eh = !in_interrupt() && current == shost->ehandler; 1508 1509 /* 1510 * The SCSI EH thread is the only context from which srp_queuecommand() 1511 * can get invoked for blocked devices (SDEV_BLOCK / 1512 * SDEV_CREATED_BLOCK). Avoid racing with srp_reconnect_rport() by 1513 * locking the rport mutex if invoked from inside the SCSI EH. 1514 */ 1515 if (in_scsi_eh) 1516 mutex_lock(&rport->mutex); 1517 1518 result = srp_chkready(target->rport); 1519 if (unlikely(result)) { 1520 scmnd->result = result; 1521 scmnd->scsi_done(scmnd); 1522 goto unlock_rport; 1523 } 1524 1525 spin_lock_irqsave(&target->lock, flags); 1526 iu = __srp_get_tx_iu(target, SRP_IU_CMD); 1527 if (!iu) 1528 goto err_unlock; 1529 1530 req = list_first_entry(&target->free_reqs, struct srp_request, list); 1531 list_del(&req->list); 1532 spin_unlock_irqrestore(&target->lock, flags); 1533 1534 dev = target->srp_host->srp_dev->dev; 1535 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len, 1536 DMA_TO_DEVICE); 1537 1538 scmnd->result = 0; 1539 scmnd->host_scribble = (void *) req; 1540 1541 cmd = iu->buf; 1542 memset(cmd, 0, sizeof *cmd); 1543 1544 cmd->opcode = SRP_CMD; 1545 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48); 1546 cmd->tag = req->index; 1547 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len); 1548 1549 req->scmnd = scmnd; 1550 req->cmd = iu; 1551 1552 len = srp_map_data(scmnd, target, req); 1553 if (len < 0) { 1554 shost_printk(KERN_ERR, target->scsi_host, 1555 PFX "Failed to map data\n"); 1556 goto err_iu; 1557 } 1558 1559 ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len, 1560 DMA_TO_DEVICE); 1561 1562 if (srp_post_send(target, iu, len)) { 1563 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n"); 1564 goto err_unmap; 1565 } 1566 1567 unlock_rport: 1568 if (in_scsi_eh) 1569 mutex_unlock(&rport->mutex); 1570 1571 return 0; 1572 1573 err_unmap: 1574 srp_unmap_data(scmnd, target, req); 1575 1576 err_iu: 1577 srp_put_tx_iu(target, iu, SRP_IU_CMD); 1578 1579 spin_lock_irqsave(&target->lock, flags); 1580 list_add(&req->list, &target->free_reqs); 1581 1582 err_unlock: 1583 spin_unlock_irqrestore(&target->lock, flags); 1584 1585 if (in_scsi_eh) 1586 mutex_unlock(&rport->mutex); 1587 1588 return SCSI_MLQUEUE_HOST_BUSY; 1589 } 1590 1591 /* 1592 * Note: the resources allocated in this function are freed in 1593 * srp_free_target_ib(). 1594 */ 1595 static int srp_alloc_iu_bufs(struct srp_target_port *target) 1596 { 1597 int i; 1598 1599 target->rx_ring = kzalloc(target->queue_size * sizeof(*target->rx_ring), 1600 GFP_KERNEL); 1601 if (!target->rx_ring) 1602 goto err_no_ring; 1603 target->tx_ring = kzalloc(target->queue_size * sizeof(*target->tx_ring), 1604 GFP_KERNEL); 1605 if (!target->tx_ring) 1606 goto err_no_ring; 1607 1608 for (i = 0; i < target->queue_size; ++i) { 1609 target->rx_ring[i] = srp_alloc_iu(target->srp_host, 1610 target->max_ti_iu_len, 1611 GFP_KERNEL, DMA_FROM_DEVICE); 1612 if (!target->rx_ring[i]) 1613 goto err; 1614 } 1615 1616 for (i = 0; i < target->queue_size; ++i) { 1617 target->tx_ring[i] = srp_alloc_iu(target->srp_host, 1618 target->max_iu_len, 1619 GFP_KERNEL, DMA_TO_DEVICE); 1620 if (!target->tx_ring[i]) 1621 goto err; 1622 1623 list_add(&target->tx_ring[i]->list, &target->free_tx); 1624 } 1625 1626 return 0; 1627 1628 err: 1629 for (i = 0; i < target->queue_size; ++i) { 1630 srp_free_iu(target->srp_host, target->rx_ring[i]); 1631 srp_free_iu(target->srp_host, target->tx_ring[i]); 1632 } 1633 1634 1635 err_no_ring: 1636 kfree(target->tx_ring); 1637 target->tx_ring = NULL; 1638 kfree(target->rx_ring); 1639 target->rx_ring = NULL; 1640 1641 return -ENOMEM; 1642 } 1643 1644 static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask) 1645 { 1646 uint64_t T_tr_ns, max_compl_time_ms; 1647 uint32_t rq_tmo_jiffies; 1648 1649 /* 1650 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair, 1651 * table 91), both the QP timeout and the retry count have to be set 1652 * for RC QP's during the RTR to RTS transition. 1653 */ 1654 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) != 1655 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)); 1656 1657 /* 1658 * Set target->rq_tmo_jiffies to one second more than the largest time 1659 * it can take before an error completion is generated. See also 1660 * C9-140..142 in the IBTA spec for more information about how to 1661 * convert the QP Local ACK Timeout value to nanoseconds. 1662 */ 1663 T_tr_ns = 4096 * (1ULL << qp_attr->timeout); 1664 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns; 1665 do_div(max_compl_time_ms, NSEC_PER_MSEC); 1666 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000); 1667 1668 return rq_tmo_jiffies; 1669 } 1670 1671 static void srp_cm_rep_handler(struct ib_cm_id *cm_id, 1672 struct srp_login_rsp *lrsp, 1673 struct srp_target_port *target) 1674 { 1675 struct ib_qp_attr *qp_attr = NULL; 1676 int attr_mask = 0; 1677 int ret; 1678 int i; 1679 1680 if (lrsp->opcode == SRP_LOGIN_RSP) { 1681 target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len); 1682 target->req_lim = be32_to_cpu(lrsp->req_lim_delta); 1683 1684 /* 1685 * Reserve credits for task management so we don't 1686 * bounce requests back to the SCSI mid-layer. 1687 */ 1688 target->scsi_host->can_queue 1689 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE, 1690 target->scsi_host->can_queue); 1691 target->scsi_host->cmd_per_lun 1692 = min_t(int, target->scsi_host->can_queue, 1693 target->scsi_host->cmd_per_lun); 1694 } else { 1695 shost_printk(KERN_WARNING, target->scsi_host, 1696 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode); 1697 ret = -ECONNRESET; 1698 goto error; 1699 } 1700 1701 if (!target->rx_ring) { 1702 ret = srp_alloc_iu_bufs(target); 1703 if (ret) 1704 goto error; 1705 } 1706 1707 ret = -ENOMEM; 1708 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL); 1709 if (!qp_attr) 1710 goto error; 1711 1712 qp_attr->qp_state = IB_QPS_RTR; 1713 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); 1714 if (ret) 1715 goto error_free; 1716 1717 ret = ib_modify_qp(target->qp, qp_attr, attr_mask); 1718 if (ret) 1719 goto error_free; 1720 1721 for (i = 0; i < target->queue_size; i++) { 1722 struct srp_iu *iu = target->rx_ring[i]; 1723 ret = srp_post_recv(target, iu); 1724 if (ret) 1725 goto error_free; 1726 } 1727 1728 qp_attr->qp_state = IB_QPS_RTS; 1729 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); 1730 if (ret) 1731 goto error_free; 1732 1733 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask); 1734 1735 ret = ib_modify_qp(target->qp, qp_attr, attr_mask); 1736 if (ret) 1737 goto error_free; 1738 1739 ret = ib_send_cm_rtu(cm_id, NULL, 0); 1740 1741 error_free: 1742 kfree(qp_attr); 1743 1744 error: 1745 target->status = ret; 1746 } 1747 1748 static void srp_cm_rej_handler(struct ib_cm_id *cm_id, 1749 struct ib_cm_event *event, 1750 struct srp_target_port *target) 1751 { 1752 struct Scsi_Host *shost = target->scsi_host; 1753 struct ib_class_port_info *cpi; 1754 int opcode; 1755 1756 switch (event->param.rej_rcvd.reason) { 1757 case IB_CM_REJ_PORT_CM_REDIRECT: 1758 cpi = event->param.rej_rcvd.ari; 1759 target->path.dlid = cpi->redirect_lid; 1760 target->path.pkey = cpi->redirect_pkey; 1761 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff; 1762 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16); 1763 1764 target->status = target->path.dlid ? 1765 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT; 1766 break; 1767 1768 case IB_CM_REJ_PORT_REDIRECT: 1769 if (srp_target_is_topspin(target)) { 1770 /* 1771 * Topspin/Cisco SRP gateways incorrectly send 1772 * reject reason code 25 when they mean 24 1773 * (port redirect). 1774 */ 1775 memcpy(target->path.dgid.raw, 1776 event->param.rej_rcvd.ari, 16); 1777 1778 shost_printk(KERN_DEBUG, shost, 1779 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n", 1780 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix), 1781 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id)); 1782 1783 target->status = SRP_PORT_REDIRECT; 1784 } else { 1785 shost_printk(KERN_WARNING, shost, 1786 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n"); 1787 target->status = -ECONNRESET; 1788 } 1789 break; 1790 1791 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID: 1792 shost_printk(KERN_WARNING, shost, 1793 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n"); 1794 target->status = -ECONNRESET; 1795 break; 1796 1797 case IB_CM_REJ_CONSUMER_DEFINED: 1798 opcode = *(u8 *) event->private_data; 1799 if (opcode == SRP_LOGIN_REJ) { 1800 struct srp_login_rej *rej = event->private_data; 1801 u32 reason = be32_to_cpu(rej->reason); 1802 1803 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE) 1804 shost_printk(KERN_WARNING, shost, 1805 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n"); 1806 else 1807 shost_printk(KERN_WARNING, shost, 1808 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason); 1809 } else 1810 shost_printk(KERN_WARNING, shost, 1811 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED," 1812 " opcode 0x%02x\n", opcode); 1813 target->status = -ECONNRESET; 1814 break; 1815 1816 case IB_CM_REJ_STALE_CONN: 1817 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n"); 1818 target->status = SRP_STALE_CONN; 1819 break; 1820 1821 default: 1822 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n", 1823 event->param.rej_rcvd.reason); 1824 target->status = -ECONNRESET; 1825 } 1826 } 1827 1828 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 1829 { 1830 struct srp_target_port *target = cm_id->context; 1831 int comp = 0; 1832 1833 switch (event->event) { 1834 case IB_CM_REQ_ERROR: 1835 shost_printk(KERN_DEBUG, target->scsi_host, 1836 PFX "Sending CM REQ failed\n"); 1837 comp = 1; 1838 target->status = -ECONNRESET; 1839 break; 1840 1841 case IB_CM_REP_RECEIVED: 1842 comp = 1; 1843 srp_cm_rep_handler(cm_id, event->private_data, target); 1844 break; 1845 1846 case IB_CM_REJ_RECEIVED: 1847 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n"); 1848 comp = 1; 1849 1850 srp_cm_rej_handler(cm_id, event, target); 1851 break; 1852 1853 case IB_CM_DREQ_RECEIVED: 1854 shost_printk(KERN_WARNING, target->scsi_host, 1855 PFX "DREQ received - connection closed\n"); 1856 srp_change_conn_state(target, false); 1857 if (ib_send_cm_drep(cm_id, NULL, 0)) 1858 shost_printk(KERN_ERR, target->scsi_host, 1859 PFX "Sending CM DREP failed\n"); 1860 queue_work(system_long_wq, &target->tl_err_work); 1861 break; 1862 1863 case IB_CM_TIMEWAIT_EXIT: 1864 shost_printk(KERN_ERR, target->scsi_host, 1865 PFX "connection closed\n"); 1866 1867 target->status = 0; 1868 break; 1869 1870 case IB_CM_MRA_RECEIVED: 1871 case IB_CM_DREQ_ERROR: 1872 case IB_CM_DREP_RECEIVED: 1873 break; 1874 1875 default: 1876 shost_printk(KERN_WARNING, target->scsi_host, 1877 PFX "Unhandled CM event %d\n", event->event); 1878 break; 1879 } 1880 1881 if (comp) 1882 complete(&target->done); 1883 1884 return 0; 1885 } 1886 1887 /** 1888 * srp_change_queue_type - changing device queue tag type 1889 * @sdev: scsi device struct 1890 * @tag_type: requested tag type 1891 * 1892 * Returns queue tag type. 1893 */ 1894 static int 1895 srp_change_queue_type(struct scsi_device *sdev, int tag_type) 1896 { 1897 if (sdev->tagged_supported) { 1898 scsi_set_tag_type(sdev, tag_type); 1899 if (tag_type) 1900 scsi_activate_tcq(sdev, sdev->queue_depth); 1901 else 1902 scsi_deactivate_tcq(sdev, sdev->queue_depth); 1903 } else 1904 tag_type = 0; 1905 1906 return tag_type; 1907 } 1908 1909 /** 1910 * srp_change_queue_depth - setting device queue depth 1911 * @sdev: scsi device struct 1912 * @qdepth: requested queue depth 1913 * @reason: SCSI_QDEPTH_DEFAULT/SCSI_QDEPTH_QFULL/SCSI_QDEPTH_RAMP_UP 1914 * (see include/scsi/scsi_host.h for definition) 1915 * 1916 * Returns queue depth. 1917 */ 1918 static int 1919 srp_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) 1920 { 1921 struct Scsi_Host *shost = sdev->host; 1922 int max_depth; 1923 if (reason == SCSI_QDEPTH_DEFAULT || reason == SCSI_QDEPTH_RAMP_UP) { 1924 max_depth = shost->can_queue; 1925 if (!sdev->tagged_supported) 1926 max_depth = 1; 1927 if (qdepth > max_depth) 1928 qdepth = max_depth; 1929 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); 1930 } else if (reason == SCSI_QDEPTH_QFULL) 1931 scsi_track_queue_full(sdev, qdepth); 1932 else 1933 return -EOPNOTSUPP; 1934 1935 return sdev->queue_depth; 1936 } 1937 1938 static int srp_send_tsk_mgmt(struct srp_target_port *target, 1939 u64 req_tag, unsigned int lun, u8 func) 1940 { 1941 struct srp_rport *rport = target->rport; 1942 struct ib_device *dev = target->srp_host->srp_dev->dev; 1943 struct srp_iu *iu; 1944 struct srp_tsk_mgmt *tsk_mgmt; 1945 1946 if (!target->connected || target->qp_in_error) 1947 return -1; 1948 1949 init_completion(&target->tsk_mgmt_done); 1950 1951 /* 1952 * Lock the rport mutex to avoid that srp_create_target_ib() is 1953 * invoked while a task management function is being sent. 1954 */ 1955 mutex_lock(&rport->mutex); 1956 spin_lock_irq(&target->lock); 1957 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT); 1958 spin_unlock_irq(&target->lock); 1959 1960 if (!iu) { 1961 mutex_unlock(&rport->mutex); 1962 1963 return -1; 1964 } 1965 1966 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt, 1967 DMA_TO_DEVICE); 1968 tsk_mgmt = iu->buf; 1969 memset(tsk_mgmt, 0, sizeof *tsk_mgmt); 1970 1971 tsk_mgmt->opcode = SRP_TSK_MGMT; 1972 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48); 1973 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT; 1974 tsk_mgmt->tsk_mgmt_func = func; 1975 tsk_mgmt->task_tag = req_tag; 1976 1977 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt, 1978 DMA_TO_DEVICE); 1979 if (srp_post_send(target, iu, sizeof *tsk_mgmt)) { 1980 srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT); 1981 mutex_unlock(&rport->mutex); 1982 1983 return -1; 1984 } 1985 mutex_unlock(&rport->mutex); 1986 1987 if (!wait_for_completion_timeout(&target->tsk_mgmt_done, 1988 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS))) 1989 return -1; 1990 1991 return 0; 1992 } 1993 1994 static int srp_abort(struct scsi_cmnd *scmnd) 1995 { 1996 struct srp_target_port *target = host_to_target(scmnd->device->host); 1997 struct srp_request *req = (struct srp_request *) scmnd->host_scribble; 1998 int ret; 1999 2000 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n"); 2001 2002 if (!req || !srp_claim_req(target, req, scmnd)) 2003 return SUCCESS; 2004 if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun, 2005 SRP_TSK_ABORT_TASK) == 0) 2006 ret = SUCCESS; 2007 else if (target->rport->state == SRP_RPORT_LOST) 2008 ret = FAST_IO_FAIL; 2009 else 2010 ret = FAILED; 2011 srp_free_req(target, req, scmnd, 0); 2012 scmnd->result = DID_ABORT << 16; 2013 scmnd->scsi_done(scmnd); 2014 2015 return ret; 2016 } 2017 2018 static int srp_reset_device(struct scsi_cmnd *scmnd) 2019 { 2020 struct srp_target_port *target = host_to_target(scmnd->device->host); 2021 int i; 2022 2023 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n"); 2024 2025 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun, 2026 SRP_TSK_LUN_RESET)) 2027 return FAILED; 2028 if (target->tsk_mgmt_status) 2029 return FAILED; 2030 2031 for (i = 0; i < target->req_ring_size; ++i) { 2032 struct srp_request *req = &target->req_ring[i]; 2033 if (req->scmnd && req->scmnd->device == scmnd->device) 2034 srp_finish_req(target, req, DID_RESET << 16); 2035 } 2036 2037 return SUCCESS; 2038 } 2039 2040 static int srp_reset_host(struct scsi_cmnd *scmnd) 2041 { 2042 struct srp_target_port *target = host_to_target(scmnd->device->host); 2043 2044 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n"); 2045 2046 return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED; 2047 } 2048 2049 static int srp_slave_configure(struct scsi_device *sdev) 2050 { 2051 struct Scsi_Host *shost = sdev->host; 2052 struct srp_target_port *target = host_to_target(shost); 2053 struct request_queue *q = sdev->request_queue; 2054 unsigned long timeout; 2055 2056 if (sdev->type == TYPE_DISK) { 2057 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies); 2058 blk_queue_rq_timeout(q, timeout); 2059 } 2060 2061 return 0; 2062 } 2063 2064 static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr, 2065 char *buf) 2066 { 2067 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 2068 2069 return sprintf(buf, "0x%016llx\n", 2070 (unsigned long long) be64_to_cpu(target->id_ext)); 2071 } 2072 2073 static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr, 2074 char *buf) 2075 { 2076 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 2077 2078 return sprintf(buf, "0x%016llx\n", 2079 (unsigned long long) be64_to_cpu(target->ioc_guid)); 2080 } 2081 2082 static ssize_t show_service_id(struct device *dev, 2083 struct device_attribute *attr, char *buf) 2084 { 2085 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 2086 2087 return sprintf(buf, "0x%016llx\n", 2088 (unsigned long long) be64_to_cpu(target->service_id)); 2089 } 2090 2091 static ssize_t show_pkey(struct device *dev, struct device_attribute *attr, 2092 char *buf) 2093 { 2094 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 2095 2096 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey)); 2097 } 2098 2099 static ssize_t show_sgid(struct device *dev, struct device_attribute *attr, 2100 char *buf) 2101 { 2102 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 2103 2104 return sprintf(buf, "%pI6\n", target->path.sgid.raw); 2105 } 2106 2107 static ssize_t show_dgid(struct device *dev, struct device_attribute *attr, 2108 char *buf) 2109 { 2110 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 2111 2112 return sprintf(buf, "%pI6\n", target->path.dgid.raw); 2113 } 2114 2115 static ssize_t show_orig_dgid(struct device *dev, 2116 struct device_attribute *attr, char *buf) 2117 { 2118 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 2119 2120 return sprintf(buf, "%pI6\n", target->orig_dgid); 2121 } 2122 2123 static ssize_t show_req_lim(struct device *dev, 2124 struct device_attribute *attr, char *buf) 2125 { 2126 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 2127 2128 return sprintf(buf, "%d\n", target->req_lim); 2129 } 2130 2131 static ssize_t show_zero_req_lim(struct device *dev, 2132 struct device_attribute *attr, char *buf) 2133 { 2134 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 2135 2136 return sprintf(buf, "%d\n", target->zero_req_lim); 2137 } 2138 2139 static ssize_t show_local_ib_port(struct device *dev, 2140 struct device_attribute *attr, char *buf) 2141 { 2142 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 2143 2144 return sprintf(buf, "%d\n", target->srp_host->port); 2145 } 2146 2147 static ssize_t show_local_ib_device(struct device *dev, 2148 struct device_attribute *attr, char *buf) 2149 { 2150 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 2151 2152 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name); 2153 } 2154 2155 static ssize_t show_comp_vector(struct device *dev, 2156 struct device_attribute *attr, char *buf) 2157 { 2158 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 2159 2160 return sprintf(buf, "%d\n", target->comp_vector); 2161 } 2162 2163 static ssize_t show_tl_retry_count(struct device *dev, 2164 struct device_attribute *attr, char *buf) 2165 { 2166 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 2167 2168 return sprintf(buf, "%d\n", target->tl_retry_count); 2169 } 2170 2171 static ssize_t show_cmd_sg_entries(struct device *dev, 2172 struct device_attribute *attr, char *buf) 2173 { 2174 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 2175 2176 return sprintf(buf, "%u\n", target->cmd_sg_cnt); 2177 } 2178 2179 static ssize_t show_allow_ext_sg(struct device *dev, 2180 struct device_attribute *attr, char *buf) 2181 { 2182 struct srp_target_port *target = host_to_target(class_to_shost(dev)); 2183 2184 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false"); 2185 } 2186 2187 static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL); 2188 static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL); 2189 static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL); 2190 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); 2191 static DEVICE_ATTR(sgid, S_IRUGO, show_sgid, NULL); 2192 static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL); 2193 static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL); 2194 static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL); 2195 static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL); 2196 static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL); 2197 static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL); 2198 static DEVICE_ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL); 2199 static DEVICE_ATTR(tl_retry_count, S_IRUGO, show_tl_retry_count, NULL); 2200 static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL); 2201 static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL); 2202 2203 static struct device_attribute *srp_host_attrs[] = { 2204 &dev_attr_id_ext, 2205 &dev_attr_ioc_guid, 2206 &dev_attr_service_id, 2207 &dev_attr_pkey, 2208 &dev_attr_sgid, 2209 &dev_attr_dgid, 2210 &dev_attr_orig_dgid, 2211 &dev_attr_req_lim, 2212 &dev_attr_zero_req_lim, 2213 &dev_attr_local_ib_port, 2214 &dev_attr_local_ib_device, 2215 &dev_attr_comp_vector, 2216 &dev_attr_tl_retry_count, 2217 &dev_attr_cmd_sg_entries, 2218 &dev_attr_allow_ext_sg, 2219 NULL 2220 }; 2221 2222 static struct scsi_host_template srp_template = { 2223 .module = THIS_MODULE, 2224 .name = "InfiniBand SRP initiator", 2225 .proc_name = DRV_NAME, 2226 .slave_configure = srp_slave_configure, 2227 .info = srp_target_info, 2228 .queuecommand = srp_queuecommand, 2229 .change_queue_depth = srp_change_queue_depth, 2230 .change_queue_type = srp_change_queue_type, 2231 .eh_abort_handler = srp_abort, 2232 .eh_device_reset_handler = srp_reset_device, 2233 .eh_host_reset_handler = srp_reset_host, 2234 .skip_settle_delay = true, 2235 .sg_tablesize = SRP_DEF_SG_TABLESIZE, 2236 .can_queue = SRP_DEFAULT_CMD_SQ_SIZE, 2237 .this_id = -1, 2238 .cmd_per_lun = SRP_DEFAULT_CMD_SQ_SIZE, 2239 .use_clustering = ENABLE_CLUSTERING, 2240 .shost_attrs = srp_host_attrs 2241 }; 2242 2243 static int srp_add_target(struct srp_host *host, struct srp_target_port *target) 2244 { 2245 struct srp_rport_identifiers ids; 2246 struct srp_rport *rport; 2247 2248 sprintf(target->target_name, "SRP.T10:%016llX", 2249 (unsigned long long) be64_to_cpu(target->id_ext)); 2250 2251 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device)) 2252 return -ENODEV; 2253 2254 memcpy(ids.port_id, &target->id_ext, 8); 2255 memcpy(ids.port_id + 8, &target->ioc_guid, 8); 2256 ids.roles = SRP_RPORT_ROLE_TARGET; 2257 rport = srp_rport_add(target->scsi_host, &ids); 2258 if (IS_ERR(rport)) { 2259 scsi_remove_host(target->scsi_host); 2260 return PTR_ERR(rport); 2261 } 2262 2263 rport->lld_data = target; 2264 target->rport = rport; 2265 2266 spin_lock(&host->target_lock); 2267 list_add_tail(&target->list, &host->target_list); 2268 spin_unlock(&host->target_lock); 2269 2270 target->state = SRP_TARGET_LIVE; 2271 2272 scsi_scan_target(&target->scsi_host->shost_gendev, 2273 0, target->scsi_id, SCAN_WILD_CARD, 0); 2274 2275 return 0; 2276 } 2277 2278 static void srp_release_dev(struct device *dev) 2279 { 2280 struct srp_host *host = 2281 container_of(dev, struct srp_host, dev); 2282 2283 complete(&host->released); 2284 } 2285 2286 static struct class srp_class = { 2287 .name = "infiniband_srp", 2288 .dev_release = srp_release_dev 2289 }; 2290 2291 /** 2292 * srp_conn_unique() - check whether the connection to a target is unique 2293 */ 2294 static bool srp_conn_unique(struct srp_host *host, 2295 struct srp_target_port *target) 2296 { 2297 struct srp_target_port *t; 2298 bool ret = false; 2299 2300 if (target->state == SRP_TARGET_REMOVED) 2301 goto out; 2302 2303 ret = true; 2304 2305 spin_lock(&host->target_lock); 2306 list_for_each_entry(t, &host->target_list, list) { 2307 if (t != target && 2308 target->id_ext == t->id_ext && 2309 target->ioc_guid == t->ioc_guid && 2310 target->initiator_ext == t->initiator_ext) { 2311 ret = false; 2312 break; 2313 } 2314 } 2315 spin_unlock(&host->target_lock); 2316 2317 out: 2318 return ret; 2319 } 2320 2321 /* 2322 * Target ports are added by writing 2323 * 2324 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>, 2325 * pkey=<P_Key>,service_id=<service ID> 2326 * 2327 * to the add_target sysfs attribute. 2328 */ 2329 enum { 2330 SRP_OPT_ERR = 0, 2331 SRP_OPT_ID_EXT = 1 << 0, 2332 SRP_OPT_IOC_GUID = 1 << 1, 2333 SRP_OPT_DGID = 1 << 2, 2334 SRP_OPT_PKEY = 1 << 3, 2335 SRP_OPT_SERVICE_ID = 1 << 4, 2336 SRP_OPT_MAX_SECT = 1 << 5, 2337 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6, 2338 SRP_OPT_IO_CLASS = 1 << 7, 2339 SRP_OPT_INITIATOR_EXT = 1 << 8, 2340 SRP_OPT_CMD_SG_ENTRIES = 1 << 9, 2341 SRP_OPT_ALLOW_EXT_SG = 1 << 10, 2342 SRP_OPT_SG_TABLESIZE = 1 << 11, 2343 SRP_OPT_COMP_VECTOR = 1 << 12, 2344 SRP_OPT_TL_RETRY_COUNT = 1 << 13, 2345 SRP_OPT_QUEUE_SIZE = 1 << 14, 2346 SRP_OPT_ALL = (SRP_OPT_ID_EXT | 2347 SRP_OPT_IOC_GUID | 2348 SRP_OPT_DGID | 2349 SRP_OPT_PKEY | 2350 SRP_OPT_SERVICE_ID), 2351 }; 2352 2353 static const match_table_t srp_opt_tokens = { 2354 { SRP_OPT_ID_EXT, "id_ext=%s" }, 2355 { SRP_OPT_IOC_GUID, "ioc_guid=%s" }, 2356 { SRP_OPT_DGID, "dgid=%s" }, 2357 { SRP_OPT_PKEY, "pkey=%x" }, 2358 { SRP_OPT_SERVICE_ID, "service_id=%s" }, 2359 { SRP_OPT_MAX_SECT, "max_sect=%d" }, 2360 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" }, 2361 { SRP_OPT_IO_CLASS, "io_class=%x" }, 2362 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" }, 2363 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" }, 2364 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" }, 2365 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" }, 2366 { SRP_OPT_COMP_VECTOR, "comp_vector=%u" }, 2367 { SRP_OPT_TL_RETRY_COUNT, "tl_retry_count=%u" }, 2368 { SRP_OPT_QUEUE_SIZE, "queue_size=%d" }, 2369 { SRP_OPT_ERR, NULL } 2370 }; 2371 2372 static int srp_parse_options(const char *buf, struct srp_target_port *target) 2373 { 2374 char *options, *sep_opt; 2375 char *p; 2376 char dgid[3]; 2377 substring_t args[MAX_OPT_ARGS]; 2378 int opt_mask = 0; 2379 int token; 2380 int ret = -EINVAL; 2381 int i; 2382 2383 options = kstrdup(buf, GFP_KERNEL); 2384 if (!options) 2385 return -ENOMEM; 2386 2387 sep_opt = options; 2388 while ((p = strsep(&sep_opt, ",")) != NULL) { 2389 if (!*p) 2390 continue; 2391 2392 token = match_token(p, srp_opt_tokens, args); 2393 opt_mask |= token; 2394 2395 switch (token) { 2396 case SRP_OPT_ID_EXT: 2397 p = match_strdup(args); 2398 if (!p) { 2399 ret = -ENOMEM; 2400 goto out; 2401 } 2402 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); 2403 kfree(p); 2404 break; 2405 2406 case SRP_OPT_IOC_GUID: 2407 p = match_strdup(args); 2408 if (!p) { 2409 ret = -ENOMEM; 2410 goto out; 2411 } 2412 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16)); 2413 kfree(p); 2414 break; 2415 2416 case SRP_OPT_DGID: 2417 p = match_strdup(args); 2418 if (!p) { 2419 ret = -ENOMEM; 2420 goto out; 2421 } 2422 if (strlen(p) != 32) { 2423 pr_warn("bad dest GID parameter '%s'\n", p); 2424 kfree(p); 2425 goto out; 2426 } 2427 2428 for (i = 0; i < 16; ++i) { 2429 strlcpy(dgid, p + i * 2, 3); 2430 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16); 2431 } 2432 kfree(p); 2433 memcpy(target->orig_dgid, target->path.dgid.raw, 16); 2434 break; 2435 2436 case SRP_OPT_PKEY: 2437 if (match_hex(args, &token)) { 2438 pr_warn("bad P_Key parameter '%s'\n", p); 2439 goto out; 2440 } 2441 target->path.pkey = cpu_to_be16(token); 2442 break; 2443 2444 case SRP_OPT_SERVICE_ID: 2445 p = match_strdup(args); 2446 if (!p) { 2447 ret = -ENOMEM; 2448 goto out; 2449 } 2450 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16)); 2451 target->path.service_id = target->service_id; 2452 kfree(p); 2453 break; 2454 2455 case SRP_OPT_MAX_SECT: 2456 if (match_int(args, &token)) { 2457 pr_warn("bad max sect parameter '%s'\n", p); 2458 goto out; 2459 } 2460 target->scsi_host->max_sectors = token; 2461 break; 2462 2463 case SRP_OPT_QUEUE_SIZE: 2464 if (match_int(args, &token) || token < 1) { 2465 pr_warn("bad queue_size parameter '%s'\n", p); 2466 goto out; 2467 } 2468 target->scsi_host->can_queue = token; 2469 target->queue_size = token + SRP_RSP_SQ_SIZE + 2470 SRP_TSK_MGMT_SQ_SIZE; 2471 if (!(opt_mask & SRP_OPT_MAX_CMD_PER_LUN)) 2472 target->scsi_host->cmd_per_lun = token; 2473 break; 2474 2475 case SRP_OPT_MAX_CMD_PER_LUN: 2476 if (match_int(args, &token) || token < 1) { 2477 pr_warn("bad max cmd_per_lun parameter '%s'\n", 2478 p); 2479 goto out; 2480 } 2481 target->scsi_host->cmd_per_lun = token; 2482 break; 2483 2484 case SRP_OPT_IO_CLASS: 2485 if (match_hex(args, &token)) { 2486 pr_warn("bad IO class parameter '%s'\n", p); 2487 goto out; 2488 } 2489 if (token != SRP_REV10_IB_IO_CLASS && 2490 token != SRP_REV16A_IB_IO_CLASS) { 2491 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n", 2492 token, SRP_REV10_IB_IO_CLASS, 2493 SRP_REV16A_IB_IO_CLASS); 2494 goto out; 2495 } 2496 target->io_class = token; 2497 break; 2498 2499 case SRP_OPT_INITIATOR_EXT: 2500 p = match_strdup(args); 2501 if (!p) { 2502 ret = -ENOMEM; 2503 goto out; 2504 } 2505 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); 2506 kfree(p); 2507 break; 2508 2509 case SRP_OPT_CMD_SG_ENTRIES: 2510 if (match_int(args, &token) || token < 1 || token > 255) { 2511 pr_warn("bad max cmd_sg_entries parameter '%s'\n", 2512 p); 2513 goto out; 2514 } 2515 target->cmd_sg_cnt = token; 2516 break; 2517 2518 case SRP_OPT_ALLOW_EXT_SG: 2519 if (match_int(args, &token)) { 2520 pr_warn("bad allow_ext_sg parameter '%s'\n", p); 2521 goto out; 2522 } 2523 target->allow_ext_sg = !!token; 2524 break; 2525 2526 case SRP_OPT_SG_TABLESIZE: 2527 if (match_int(args, &token) || token < 1 || 2528 token > SCSI_MAX_SG_CHAIN_SEGMENTS) { 2529 pr_warn("bad max sg_tablesize parameter '%s'\n", 2530 p); 2531 goto out; 2532 } 2533 target->sg_tablesize = token; 2534 break; 2535 2536 case SRP_OPT_COMP_VECTOR: 2537 if (match_int(args, &token) || token < 0) { 2538 pr_warn("bad comp_vector parameter '%s'\n", p); 2539 goto out; 2540 } 2541 target->comp_vector = token; 2542 break; 2543 2544 case SRP_OPT_TL_RETRY_COUNT: 2545 if (match_int(args, &token) || token < 2 || token > 7) { 2546 pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n", 2547 p); 2548 goto out; 2549 } 2550 target->tl_retry_count = token; 2551 break; 2552 2553 default: 2554 pr_warn("unknown parameter or missing value '%s' in target creation request\n", 2555 p); 2556 goto out; 2557 } 2558 } 2559 2560 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL) 2561 ret = 0; 2562 else 2563 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i) 2564 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) && 2565 !(srp_opt_tokens[i].token & opt_mask)) 2566 pr_warn("target creation request is missing parameter '%s'\n", 2567 srp_opt_tokens[i].pattern); 2568 2569 if (target->scsi_host->cmd_per_lun > target->scsi_host->can_queue 2570 && (opt_mask & SRP_OPT_MAX_CMD_PER_LUN)) 2571 pr_warn("cmd_per_lun = %d > queue_size = %d\n", 2572 target->scsi_host->cmd_per_lun, 2573 target->scsi_host->can_queue); 2574 2575 out: 2576 kfree(options); 2577 return ret; 2578 } 2579 2580 static ssize_t srp_create_target(struct device *dev, 2581 struct device_attribute *attr, 2582 const char *buf, size_t count) 2583 { 2584 struct srp_host *host = 2585 container_of(dev, struct srp_host, dev); 2586 struct Scsi_Host *target_host; 2587 struct srp_target_port *target; 2588 struct ib_device *ibdev = host->srp_dev->dev; 2589 int ret; 2590 2591 target_host = scsi_host_alloc(&srp_template, 2592 sizeof (struct srp_target_port)); 2593 if (!target_host) 2594 return -ENOMEM; 2595 2596 target_host->transportt = ib_srp_transport_template; 2597 target_host->max_channel = 0; 2598 target_host->max_id = 1; 2599 target_host->max_lun = SRP_MAX_LUN; 2600 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb; 2601 2602 target = host_to_target(target_host); 2603 2604 target->io_class = SRP_REV16A_IB_IO_CLASS; 2605 target->scsi_host = target_host; 2606 target->srp_host = host; 2607 target->lkey = host->srp_dev->mr->lkey; 2608 target->rkey = host->srp_dev->mr->rkey; 2609 target->cmd_sg_cnt = cmd_sg_entries; 2610 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries; 2611 target->allow_ext_sg = allow_ext_sg; 2612 target->tl_retry_count = 7; 2613 target->queue_size = SRP_DEFAULT_QUEUE_SIZE; 2614 2615 ret = srp_parse_options(buf, target); 2616 if (ret) 2617 goto err; 2618 2619 target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE; 2620 2621 if (!srp_conn_unique(target->srp_host, target)) { 2622 shost_printk(KERN_INFO, target->scsi_host, 2623 PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n", 2624 be64_to_cpu(target->id_ext), 2625 be64_to_cpu(target->ioc_guid), 2626 be64_to_cpu(target->initiator_ext)); 2627 ret = -EEXIST; 2628 goto err; 2629 } 2630 2631 if (!host->srp_dev->fmr_pool && !target->allow_ext_sg && 2632 target->cmd_sg_cnt < target->sg_tablesize) { 2633 pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n"); 2634 target->sg_tablesize = target->cmd_sg_cnt; 2635 } 2636 2637 target_host->sg_tablesize = target->sg_tablesize; 2638 target->indirect_size = target->sg_tablesize * 2639 sizeof (struct srp_direct_buf); 2640 target->max_iu_len = sizeof (struct srp_cmd) + 2641 sizeof (struct srp_indirect_buf) + 2642 target->cmd_sg_cnt * sizeof (struct srp_direct_buf); 2643 2644 INIT_WORK(&target->tl_err_work, srp_tl_err_work); 2645 INIT_WORK(&target->remove_work, srp_remove_work); 2646 spin_lock_init(&target->lock); 2647 INIT_LIST_HEAD(&target->free_tx); 2648 ret = srp_alloc_req_data(target); 2649 if (ret) 2650 goto err_free_mem; 2651 2652 ib_query_gid(ibdev, host->port, 0, &target->path.sgid); 2653 2654 shost_printk(KERN_DEBUG, target->scsi_host, PFX 2655 "new target: id_ext %016llx ioc_guid %016llx pkey %04x " 2656 "service_id %016llx dgid %pI6\n", 2657 (unsigned long long) be64_to_cpu(target->id_ext), 2658 (unsigned long long) be64_to_cpu(target->ioc_guid), 2659 be16_to_cpu(target->path.pkey), 2660 (unsigned long long) be64_to_cpu(target->service_id), 2661 target->path.dgid.raw); 2662 2663 ret = srp_create_target_ib(target); 2664 if (ret) 2665 goto err_free_mem; 2666 2667 ret = srp_new_cm_id(target); 2668 if (ret) 2669 goto err_free_ib; 2670 2671 ret = srp_connect_target(target); 2672 if (ret) { 2673 shost_printk(KERN_ERR, target->scsi_host, 2674 PFX "Connection failed\n"); 2675 goto err_cm_id; 2676 } 2677 2678 ret = srp_add_target(host, target); 2679 if (ret) 2680 goto err_disconnect; 2681 2682 return count; 2683 2684 err_disconnect: 2685 srp_disconnect_target(target); 2686 2687 err_cm_id: 2688 ib_destroy_cm_id(target->cm_id); 2689 2690 err_free_ib: 2691 srp_free_target_ib(target); 2692 2693 err_free_mem: 2694 srp_free_req_data(target); 2695 2696 err: 2697 scsi_host_put(target_host); 2698 2699 return ret; 2700 } 2701 2702 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target); 2703 2704 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr, 2705 char *buf) 2706 { 2707 struct srp_host *host = container_of(dev, struct srp_host, dev); 2708 2709 return sprintf(buf, "%s\n", host->srp_dev->dev->name); 2710 } 2711 2712 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 2713 2714 static ssize_t show_port(struct device *dev, struct device_attribute *attr, 2715 char *buf) 2716 { 2717 struct srp_host *host = container_of(dev, struct srp_host, dev); 2718 2719 return sprintf(buf, "%d\n", host->port); 2720 } 2721 2722 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL); 2723 2724 static struct srp_host *srp_add_port(struct srp_device *device, u8 port) 2725 { 2726 struct srp_host *host; 2727 2728 host = kzalloc(sizeof *host, GFP_KERNEL); 2729 if (!host) 2730 return NULL; 2731 2732 INIT_LIST_HEAD(&host->target_list); 2733 spin_lock_init(&host->target_lock); 2734 init_completion(&host->released); 2735 host->srp_dev = device; 2736 host->port = port; 2737 2738 host->dev.class = &srp_class; 2739 host->dev.parent = device->dev->dma_device; 2740 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port); 2741 2742 if (device_register(&host->dev)) 2743 goto free_host; 2744 if (device_create_file(&host->dev, &dev_attr_add_target)) 2745 goto err_class; 2746 if (device_create_file(&host->dev, &dev_attr_ibdev)) 2747 goto err_class; 2748 if (device_create_file(&host->dev, &dev_attr_port)) 2749 goto err_class; 2750 2751 return host; 2752 2753 err_class: 2754 device_unregister(&host->dev); 2755 2756 free_host: 2757 kfree(host); 2758 2759 return NULL; 2760 } 2761 2762 static void srp_add_one(struct ib_device *device) 2763 { 2764 struct srp_device *srp_dev; 2765 struct ib_device_attr *dev_attr; 2766 struct ib_fmr_pool_param fmr_param; 2767 struct srp_host *host; 2768 int max_pages_per_fmr, fmr_page_shift, s, e, p; 2769 2770 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL); 2771 if (!dev_attr) 2772 return; 2773 2774 if (ib_query_device(device, dev_attr)) { 2775 pr_warn("Query device failed for %s\n", device->name); 2776 goto free_attr; 2777 } 2778 2779 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL); 2780 if (!srp_dev) 2781 goto free_attr; 2782 2783 /* 2784 * Use the smallest page size supported by the HCA, down to a 2785 * minimum of 4096 bytes. We're unlikely to build large sglists 2786 * out of smaller entries. 2787 */ 2788 fmr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1); 2789 srp_dev->fmr_page_size = 1 << fmr_page_shift; 2790 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1); 2791 srp_dev->fmr_max_size = srp_dev->fmr_page_size * SRP_FMR_SIZE; 2792 2793 INIT_LIST_HEAD(&srp_dev->dev_list); 2794 2795 srp_dev->dev = device; 2796 srp_dev->pd = ib_alloc_pd(device); 2797 if (IS_ERR(srp_dev->pd)) 2798 goto free_dev; 2799 2800 srp_dev->mr = ib_get_dma_mr(srp_dev->pd, 2801 IB_ACCESS_LOCAL_WRITE | 2802 IB_ACCESS_REMOTE_READ | 2803 IB_ACCESS_REMOTE_WRITE); 2804 if (IS_ERR(srp_dev->mr)) 2805 goto err_pd; 2806 2807 for (max_pages_per_fmr = SRP_FMR_SIZE; 2808 max_pages_per_fmr >= SRP_FMR_MIN_SIZE; 2809 max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) { 2810 memset(&fmr_param, 0, sizeof fmr_param); 2811 fmr_param.pool_size = SRP_FMR_POOL_SIZE; 2812 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE; 2813 fmr_param.cache = 1; 2814 fmr_param.max_pages_per_fmr = max_pages_per_fmr; 2815 fmr_param.page_shift = fmr_page_shift; 2816 fmr_param.access = (IB_ACCESS_LOCAL_WRITE | 2817 IB_ACCESS_REMOTE_WRITE | 2818 IB_ACCESS_REMOTE_READ); 2819 2820 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param); 2821 if (!IS_ERR(srp_dev->fmr_pool)) 2822 break; 2823 } 2824 2825 if (IS_ERR(srp_dev->fmr_pool)) 2826 srp_dev->fmr_pool = NULL; 2827 2828 if (device->node_type == RDMA_NODE_IB_SWITCH) { 2829 s = 0; 2830 e = 0; 2831 } else { 2832 s = 1; 2833 e = device->phys_port_cnt; 2834 } 2835 2836 for (p = s; p <= e; ++p) { 2837 host = srp_add_port(srp_dev, p); 2838 if (host) 2839 list_add_tail(&host->list, &srp_dev->dev_list); 2840 } 2841 2842 ib_set_client_data(device, &srp_client, srp_dev); 2843 2844 goto free_attr; 2845 2846 err_pd: 2847 ib_dealloc_pd(srp_dev->pd); 2848 2849 free_dev: 2850 kfree(srp_dev); 2851 2852 free_attr: 2853 kfree(dev_attr); 2854 } 2855 2856 static void srp_remove_one(struct ib_device *device) 2857 { 2858 struct srp_device *srp_dev; 2859 struct srp_host *host, *tmp_host; 2860 struct srp_target_port *target; 2861 2862 srp_dev = ib_get_client_data(device, &srp_client); 2863 if (!srp_dev) 2864 return; 2865 2866 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) { 2867 device_unregister(&host->dev); 2868 /* 2869 * Wait for the sysfs entry to go away, so that no new 2870 * target ports can be created. 2871 */ 2872 wait_for_completion(&host->released); 2873 2874 /* 2875 * Remove all target ports. 2876 */ 2877 spin_lock(&host->target_lock); 2878 list_for_each_entry(target, &host->target_list, list) 2879 srp_queue_remove_work(target); 2880 spin_unlock(&host->target_lock); 2881 2882 /* 2883 * Wait for target port removal tasks. 2884 */ 2885 flush_workqueue(system_long_wq); 2886 2887 kfree(host); 2888 } 2889 2890 if (srp_dev->fmr_pool) 2891 ib_destroy_fmr_pool(srp_dev->fmr_pool); 2892 ib_dereg_mr(srp_dev->mr); 2893 ib_dealloc_pd(srp_dev->pd); 2894 2895 kfree(srp_dev); 2896 } 2897 2898 static struct srp_function_template ib_srp_transport_functions = { 2899 .has_rport_state = true, 2900 .reset_timer_if_blocked = true, 2901 .reconnect_delay = &srp_reconnect_delay, 2902 .fast_io_fail_tmo = &srp_fast_io_fail_tmo, 2903 .dev_loss_tmo = &srp_dev_loss_tmo, 2904 .reconnect = srp_rport_reconnect, 2905 .rport_delete = srp_rport_delete, 2906 .terminate_rport_io = srp_terminate_io, 2907 }; 2908 2909 static int __init srp_init_module(void) 2910 { 2911 int ret; 2912 2913 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *)); 2914 2915 if (srp_sg_tablesize) { 2916 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n"); 2917 if (!cmd_sg_entries) 2918 cmd_sg_entries = srp_sg_tablesize; 2919 } 2920 2921 if (!cmd_sg_entries) 2922 cmd_sg_entries = SRP_DEF_SG_TABLESIZE; 2923 2924 if (cmd_sg_entries > 255) { 2925 pr_warn("Clamping cmd_sg_entries to 255\n"); 2926 cmd_sg_entries = 255; 2927 } 2928 2929 if (!indirect_sg_entries) 2930 indirect_sg_entries = cmd_sg_entries; 2931 else if (indirect_sg_entries < cmd_sg_entries) { 2932 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n", 2933 cmd_sg_entries); 2934 indirect_sg_entries = cmd_sg_entries; 2935 } 2936 2937 ib_srp_transport_template = 2938 srp_attach_transport(&ib_srp_transport_functions); 2939 if (!ib_srp_transport_template) 2940 return -ENOMEM; 2941 2942 ret = class_register(&srp_class); 2943 if (ret) { 2944 pr_err("couldn't register class infiniband_srp\n"); 2945 srp_release_transport(ib_srp_transport_template); 2946 return ret; 2947 } 2948 2949 ib_sa_register_client(&srp_sa_client); 2950 2951 ret = ib_register_client(&srp_client); 2952 if (ret) { 2953 pr_err("couldn't register IB client\n"); 2954 srp_release_transport(ib_srp_transport_template); 2955 ib_sa_unregister_client(&srp_sa_client); 2956 class_unregister(&srp_class); 2957 return ret; 2958 } 2959 2960 return 0; 2961 } 2962 2963 static void __exit srp_cleanup_module(void) 2964 { 2965 ib_unregister_client(&srp_client); 2966 ib_sa_unregister_client(&srp_sa_client); 2967 class_unregister(&srp_class); 2968 srp_release_transport(ib_srp_transport_template); 2969 } 2970 2971 module_init(srp_init_module); 2972 module_exit(srp_cleanup_module); 2973