1 /* 2 * Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved. 3 * Copyright (C) 2008 - 2011 Bart Van Assche <bvanassche@acm.org>. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 * 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/ctype.h> 40 #include <linux/kthread.h> 41 #include <linux/string.h> 42 #include <linux/delay.h> 43 #include <linux/atomic.h> 44 #include <scsi/scsi_tcq.h> 45 #include <target/configfs_macros.h> 46 #include <target/target_core_base.h> 47 #include <target/target_core_fabric_configfs.h> 48 #include <target/target_core_fabric.h> 49 #include <target/target_core_configfs.h> 50 #include "ib_srpt.h" 51 52 /* Name of this kernel module. */ 53 #define DRV_NAME "ib_srpt" 54 #define DRV_VERSION "2.0.0" 55 #define DRV_RELDATE "2011-02-14" 56 57 #define SRPT_ID_STRING "Linux SRP target" 58 59 #undef pr_fmt 60 #define pr_fmt(fmt) DRV_NAME " " fmt 61 62 MODULE_AUTHOR("Vu Pham and Bart Van Assche"); 63 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol target " 64 "v" DRV_VERSION " (" DRV_RELDATE ")"); 65 MODULE_LICENSE("Dual BSD/GPL"); 66 67 /* 68 * Global Variables 69 */ 70 71 static u64 srpt_service_guid; 72 static DEFINE_SPINLOCK(srpt_dev_lock); /* Protects srpt_dev_list. */ 73 static LIST_HEAD(srpt_dev_list); /* List of srpt_device structures. */ 74 75 static unsigned srp_max_req_size = DEFAULT_MAX_REQ_SIZE; 76 module_param(srp_max_req_size, int, 0444); 77 MODULE_PARM_DESC(srp_max_req_size, 78 "Maximum size of SRP request messages in bytes."); 79 80 static int srpt_srq_size = DEFAULT_SRPT_SRQ_SIZE; 81 module_param(srpt_srq_size, int, 0444); 82 MODULE_PARM_DESC(srpt_srq_size, 83 "Shared receive queue (SRQ) size."); 84 85 static int srpt_get_u64_x(char *buffer, struct kernel_param *kp) 86 { 87 return sprintf(buffer, "0x%016llx", *(u64 *)kp->arg); 88 } 89 module_param_call(srpt_service_guid, NULL, srpt_get_u64_x, &srpt_service_guid, 90 0444); 91 MODULE_PARM_DESC(srpt_service_guid, 92 "Using this value for ioc_guid, id_ext, and cm_listen_id" 93 " instead of using the node_guid of the first HCA."); 94 95 static struct ib_client srpt_client; 96 static struct target_fabric_configfs *srpt_target; 97 static void srpt_release_channel(struct srpt_rdma_ch *ch); 98 static int srpt_queue_status(struct se_cmd *cmd); 99 100 /** 101 * opposite_dma_dir() - Swap DMA_TO_DEVICE and DMA_FROM_DEVICE. 102 */ 103 static inline 104 enum dma_data_direction opposite_dma_dir(enum dma_data_direction dir) 105 { 106 switch (dir) { 107 case DMA_TO_DEVICE: return DMA_FROM_DEVICE; 108 case DMA_FROM_DEVICE: return DMA_TO_DEVICE; 109 default: return dir; 110 } 111 } 112 113 /** 114 * srpt_sdev_name() - Return the name associated with the HCA. 115 * 116 * Examples are ib0, ib1, ... 117 */ 118 static inline const char *srpt_sdev_name(struct srpt_device *sdev) 119 { 120 return sdev->device->name; 121 } 122 123 static enum rdma_ch_state srpt_get_ch_state(struct srpt_rdma_ch *ch) 124 { 125 unsigned long flags; 126 enum rdma_ch_state state; 127 128 spin_lock_irqsave(&ch->spinlock, flags); 129 state = ch->state; 130 spin_unlock_irqrestore(&ch->spinlock, flags); 131 return state; 132 } 133 134 static enum rdma_ch_state 135 srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new_state) 136 { 137 unsigned long flags; 138 enum rdma_ch_state prev; 139 140 spin_lock_irqsave(&ch->spinlock, flags); 141 prev = ch->state; 142 ch->state = new_state; 143 spin_unlock_irqrestore(&ch->spinlock, flags); 144 return prev; 145 } 146 147 /** 148 * srpt_test_and_set_ch_state() - Test and set the channel state. 149 * 150 * Returns true if and only if the channel state has been set to the new state. 151 */ 152 static bool 153 srpt_test_and_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state old, 154 enum rdma_ch_state new) 155 { 156 unsigned long flags; 157 enum rdma_ch_state prev; 158 159 spin_lock_irqsave(&ch->spinlock, flags); 160 prev = ch->state; 161 if (prev == old) 162 ch->state = new; 163 spin_unlock_irqrestore(&ch->spinlock, flags); 164 return prev == old; 165 } 166 167 /** 168 * srpt_event_handler() - Asynchronous IB event callback function. 169 * 170 * Callback function called by the InfiniBand core when an asynchronous IB 171 * event occurs. This callback may occur in interrupt context. See also 172 * section 11.5.2, Set Asynchronous Event Handler in the InfiniBand 173 * Architecture Specification. 174 */ 175 static void srpt_event_handler(struct ib_event_handler *handler, 176 struct ib_event *event) 177 { 178 struct srpt_device *sdev; 179 struct srpt_port *sport; 180 181 sdev = ib_get_client_data(event->device, &srpt_client); 182 if (!sdev || sdev->device != event->device) 183 return; 184 185 pr_debug("ASYNC event= %d on device= %s\n", event->event, 186 srpt_sdev_name(sdev)); 187 188 switch (event->event) { 189 case IB_EVENT_PORT_ERR: 190 if (event->element.port_num <= sdev->device->phys_port_cnt) { 191 sport = &sdev->port[event->element.port_num - 1]; 192 sport->lid = 0; 193 sport->sm_lid = 0; 194 } 195 break; 196 case IB_EVENT_PORT_ACTIVE: 197 case IB_EVENT_LID_CHANGE: 198 case IB_EVENT_PKEY_CHANGE: 199 case IB_EVENT_SM_CHANGE: 200 case IB_EVENT_CLIENT_REREGISTER: 201 /* Refresh port data asynchronously. */ 202 if (event->element.port_num <= sdev->device->phys_port_cnt) { 203 sport = &sdev->port[event->element.port_num - 1]; 204 if (!sport->lid && !sport->sm_lid) 205 schedule_work(&sport->work); 206 } 207 break; 208 default: 209 printk(KERN_ERR "received unrecognized IB event %d\n", 210 event->event); 211 break; 212 } 213 } 214 215 /** 216 * srpt_srq_event() - SRQ event callback function. 217 */ 218 static void srpt_srq_event(struct ib_event *event, void *ctx) 219 { 220 printk(KERN_INFO "SRQ event %d\n", event->event); 221 } 222 223 /** 224 * srpt_qp_event() - QP event callback function. 225 */ 226 static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch) 227 { 228 pr_debug("QP event %d on cm_id=%p sess_name=%s state=%d\n", 229 event->event, ch->cm_id, ch->sess_name, srpt_get_ch_state(ch)); 230 231 switch (event->event) { 232 case IB_EVENT_COMM_EST: 233 ib_cm_notify(ch->cm_id, event->event); 234 break; 235 case IB_EVENT_QP_LAST_WQE_REACHED: 236 if (srpt_test_and_set_ch_state(ch, CH_DRAINING, 237 CH_RELEASING)) 238 srpt_release_channel(ch); 239 else 240 pr_debug("%s: state %d - ignored LAST_WQE.\n", 241 ch->sess_name, srpt_get_ch_state(ch)); 242 break; 243 default: 244 printk(KERN_ERR "received unrecognized IB QP event %d\n", 245 event->event); 246 break; 247 } 248 } 249 250 /** 251 * srpt_set_ioc() - Helper function for initializing an IOUnitInfo structure. 252 * 253 * @slot: one-based slot number. 254 * @value: four-bit value. 255 * 256 * Copies the lowest four bits of value in element slot of the array of four 257 * bit elements called c_list (controller list). The index slot is one-based. 258 */ 259 static void srpt_set_ioc(u8 *c_list, u32 slot, u8 value) 260 { 261 u16 id; 262 u8 tmp; 263 264 id = (slot - 1) / 2; 265 if (slot & 0x1) { 266 tmp = c_list[id] & 0xf; 267 c_list[id] = (value << 4) | tmp; 268 } else { 269 tmp = c_list[id] & 0xf0; 270 c_list[id] = (value & 0xf) | tmp; 271 } 272 } 273 274 /** 275 * srpt_get_class_port_info() - Copy ClassPortInfo to a management datagram. 276 * 277 * See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture 278 * Specification. 279 */ 280 static void srpt_get_class_port_info(struct ib_dm_mad *mad) 281 { 282 struct ib_class_port_info *cif; 283 284 cif = (struct ib_class_port_info *)mad->data; 285 memset(cif, 0, sizeof *cif); 286 cif->base_version = 1; 287 cif->class_version = 1; 288 cif->resp_time_value = 20; 289 290 mad->mad_hdr.status = 0; 291 } 292 293 /** 294 * srpt_get_iou() - Write IOUnitInfo to a management datagram. 295 * 296 * See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture 297 * Specification. See also section B.7, table B.6 in the SRP r16a document. 298 */ 299 static void srpt_get_iou(struct ib_dm_mad *mad) 300 { 301 struct ib_dm_iou_info *ioui; 302 u8 slot; 303 int i; 304 305 ioui = (struct ib_dm_iou_info *)mad->data; 306 ioui->change_id = __constant_cpu_to_be16(1); 307 ioui->max_controllers = 16; 308 309 /* set present for slot 1 and empty for the rest */ 310 srpt_set_ioc(ioui->controller_list, 1, 1); 311 for (i = 1, slot = 2; i < 16; i++, slot++) 312 srpt_set_ioc(ioui->controller_list, slot, 0); 313 314 mad->mad_hdr.status = 0; 315 } 316 317 /** 318 * srpt_get_ioc() - Write IOControllerprofile to a management datagram. 319 * 320 * See also section 16.3.3.4 IOControllerProfile in the InfiniBand 321 * Architecture Specification. See also section B.7, table B.7 in the SRP 322 * r16a document. 323 */ 324 static void srpt_get_ioc(struct srpt_port *sport, u32 slot, 325 struct ib_dm_mad *mad) 326 { 327 struct srpt_device *sdev = sport->sdev; 328 struct ib_dm_ioc_profile *iocp; 329 330 iocp = (struct ib_dm_ioc_profile *)mad->data; 331 332 if (!slot || slot > 16) { 333 mad->mad_hdr.status 334 = __constant_cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD); 335 return; 336 } 337 338 if (slot > 2) { 339 mad->mad_hdr.status 340 = __constant_cpu_to_be16(DM_MAD_STATUS_NO_IOC); 341 return; 342 } 343 344 memset(iocp, 0, sizeof *iocp); 345 strcpy(iocp->id_string, SRPT_ID_STRING); 346 iocp->guid = cpu_to_be64(srpt_service_guid); 347 iocp->vendor_id = cpu_to_be32(sdev->dev_attr.vendor_id); 348 iocp->device_id = cpu_to_be32(sdev->dev_attr.vendor_part_id); 349 iocp->device_version = cpu_to_be16(sdev->dev_attr.hw_ver); 350 iocp->subsys_vendor_id = cpu_to_be32(sdev->dev_attr.vendor_id); 351 iocp->subsys_device_id = 0x0; 352 iocp->io_class = __constant_cpu_to_be16(SRP_REV16A_IB_IO_CLASS); 353 iocp->io_subclass = __constant_cpu_to_be16(SRP_IO_SUBCLASS); 354 iocp->protocol = __constant_cpu_to_be16(SRP_PROTOCOL); 355 iocp->protocol_version = __constant_cpu_to_be16(SRP_PROTOCOL_VERSION); 356 iocp->send_queue_depth = cpu_to_be16(sdev->srq_size); 357 iocp->rdma_read_depth = 4; 358 iocp->send_size = cpu_to_be32(srp_max_req_size); 359 iocp->rdma_size = cpu_to_be32(min(sport->port_attrib.srp_max_rdma_size, 360 1U << 24)); 361 iocp->num_svc_entries = 1; 362 iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC | 363 SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC; 364 365 mad->mad_hdr.status = 0; 366 } 367 368 /** 369 * srpt_get_svc_entries() - Write ServiceEntries to a management datagram. 370 * 371 * See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture 372 * Specification. See also section B.7, table B.8 in the SRP r16a document. 373 */ 374 static void srpt_get_svc_entries(u64 ioc_guid, 375 u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad) 376 { 377 struct ib_dm_svc_entries *svc_entries; 378 379 WARN_ON(!ioc_guid); 380 381 if (!slot || slot > 16) { 382 mad->mad_hdr.status 383 = __constant_cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD); 384 return; 385 } 386 387 if (slot > 2 || lo > hi || hi > 1) { 388 mad->mad_hdr.status 389 = __constant_cpu_to_be16(DM_MAD_STATUS_NO_IOC); 390 return; 391 } 392 393 svc_entries = (struct ib_dm_svc_entries *)mad->data; 394 memset(svc_entries, 0, sizeof *svc_entries); 395 svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid); 396 snprintf(svc_entries->service_entries[0].name, 397 sizeof(svc_entries->service_entries[0].name), 398 "%s%016llx", 399 SRP_SERVICE_NAME_PREFIX, 400 ioc_guid); 401 402 mad->mad_hdr.status = 0; 403 } 404 405 /** 406 * srpt_mgmt_method_get() - Process a received management datagram. 407 * @sp: source port through which the MAD has been received. 408 * @rq_mad: received MAD. 409 * @rsp_mad: response MAD. 410 */ 411 static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad, 412 struct ib_dm_mad *rsp_mad) 413 { 414 u16 attr_id; 415 u32 slot; 416 u8 hi, lo; 417 418 attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id); 419 switch (attr_id) { 420 case DM_ATTR_CLASS_PORT_INFO: 421 srpt_get_class_port_info(rsp_mad); 422 break; 423 case DM_ATTR_IOU_INFO: 424 srpt_get_iou(rsp_mad); 425 break; 426 case DM_ATTR_IOC_PROFILE: 427 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod); 428 srpt_get_ioc(sp, slot, rsp_mad); 429 break; 430 case DM_ATTR_SVC_ENTRIES: 431 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod); 432 hi = (u8) ((slot >> 8) & 0xff); 433 lo = (u8) (slot & 0xff); 434 slot = (u16) ((slot >> 16) & 0xffff); 435 srpt_get_svc_entries(srpt_service_guid, 436 slot, hi, lo, rsp_mad); 437 break; 438 default: 439 rsp_mad->mad_hdr.status = 440 __constant_cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR); 441 break; 442 } 443 } 444 445 /** 446 * srpt_mad_send_handler() - Post MAD-send callback function. 447 */ 448 static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent, 449 struct ib_mad_send_wc *mad_wc) 450 { 451 ib_destroy_ah(mad_wc->send_buf->ah); 452 ib_free_send_mad(mad_wc->send_buf); 453 } 454 455 /** 456 * srpt_mad_recv_handler() - MAD reception callback function. 457 */ 458 static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent, 459 struct ib_mad_recv_wc *mad_wc) 460 { 461 struct srpt_port *sport = (struct srpt_port *)mad_agent->context; 462 struct ib_ah *ah; 463 struct ib_mad_send_buf *rsp; 464 struct ib_dm_mad *dm_mad; 465 466 if (!mad_wc || !mad_wc->recv_buf.mad) 467 return; 468 469 ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc, 470 mad_wc->recv_buf.grh, mad_agent->port_num); 471 if (IS_ERR(ah)) 472 goto err; 473 474 BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR); 475 476 rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp, 477 mad_wc->wc->pkey_index, 0, 478 IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA, 479 GFP_KERNEL); 480 if (IS_ERR(rsp)) 481 goto err_rsp; 482 483 rsp->ah = ah; 484 485 dm_mad = rsp->mad; 486 memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof *dm_mad); 487 dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP; 488 dm_mad->mad_hdr.status = 0; 489 490 switch (mad_wc->recv_buf.mad->mad_hdr.method) { 491 case IB_MGMT_METHOD_GET: 492 srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad); 493 break; 494 case IB_MGMT_METHOD_SET: 495 dm_mad->mad_hdr.status = 496 __constant_cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR); 497 break; 498 default: 499 dm_mad->mad_hdr.status = 500 __constant_cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD); 501 break; 502 } 503 504 if (!ib_post_send_mad(rsp, NULL)) { 505 ib_free_recv_mad(mad_wc); 506 /* will destroy_ah & free_send_mad in send completion */ 507 return; 508 } 509 510 ib_free_send_mad(rsp); 511 512 err_rsp: 513 ib_destroy_ah(ah); 514 err: 515 ib_free_recv_mad(mad_wc); 516 } 517 518 /** 519 * srpt_refresh_port() - Configure a HCA port. 520 * 521 * Enable InfiniBand management datagram processing, update the cached sm_lid, 522 * lid and gid values, and register a callback function for processing MADs 523 * on the specified port. 524 * 525 * Note: It is safe to call this function more than once for the same port. 526 */ 527 static int srpt_refresh_port(struct srpt_port *sport) 528 { 529 struct ib_mad_reg_req reg_req; 530 struct ib_port_modify port_modify; 531 struct ib_port_attr port_attr; 532 int ret; 533 534 memset(&port_modify, 0, sizeof port_modify); 535 port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP; 536 port_modify.clr_port_cap_mask = 0; 537 538 ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify); 539 if (ret) 540 goto err_mod_port; 541 542 ret = ib_query_port(sport->sdev->device, sport->port, &port_attr); 543 if (ret) 544 goto err_query_port; 545 546 sport->sm_lid = port_attr.sm_lid; 547 sport->lid = port_attr.lid; 548 549 ret = ib_query_gid(sport->sdev->device, sport->port, 0, &sport->gid); 550 if (ret) 551 goto err_query_port; 552 553 if (!sport->mad_agent) { 554 memset(®_req, 0, sizeof reg_req); 555 reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT; 556 reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION; 557 set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask); 558 set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask); 559 560 sport->mad_agent = ib_register_mad_agent(sport->sdev->device, 561 sport->port, 562 IB_QPT_GSI, 563 ®_req, 0, 564 srpt_mad_send_handler, 565 srpt_mad_recv_handler, 566 sport); 567 if (IS_ERR(sport->mad_agent)) { 568 ret = PTR_ERR(sport->mad_agent); 569 sport->mad_agent = NULL; 570 goto err_query_port; 571 } 572 } 573 574 return 0; 575 576 err_query_port: 577 578 port_modify.set_port_cap_mask = 0; 579 port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP; 580 ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify); 581 582 err_mod_port: 583 584 return ret; 585 } 586 587 /** 588 * srpt_unregister_mad_agent() - Unregister MAD callback functions. 589 * 590 * Note: It is safe to call this function more than once for the same device. 591 */ 592 static void srpt_unregister_mad_agent(struct srpt_device *sdev) 593 { 594 struct ib_port_modify port_modify = { 595 .clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP, 596 }; 597 struct srpt_port *sport; 598 int i; 599 600 for (i = 1; i <= sdev->device->phys_port_cnt; i++) { 601 sport = &sdev->port[i - 1]; 602 WARN_ON(sport->port != i); 603 if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0) 604 printk(KERN_ERR "disabling MAD processing failed.\n"); 605 if (sport->mad_agent) { 606 ib_unregister_mad_agent(sport->mad_agent); 607 sport->mad_agent = NULL; 608 } 609 } 610 } 611 612 /** 613 * srpt_alloc_ioctx() - Allocate an SRPT I/O context structure. 614 */ 615 static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev, 616 int ioctx_size, int dma_size, 617 enum dma_data_direction dir) 618 { 619 struct srpt_ioctx *ioctx; 620 621 ioctx = kmalloc(ioctx_size, GFP_KERNEL); 622 if (!ioctx) 623 goto err; 624 625 ioctx->buf = kmalloc(dma_size, GFP_KERNEL); 626 if (!ioctx->buf) 627 goto err_free_ioctx; 628 629 ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf, dma_size, dir); 630 if (ib_dma_mapping_error(sdev->device, ioctx->dma)) 631 goto err_free_buf; 632 633 return ioctx; 634 635 err_free_buf: 636 kfree(ioctx->buf); 637 err_free_ioctx: 638 kfree(ioctx); 639 err: 640 return NULL; 641 } 642 643 /** 644 * srpt_free_ioctx() - Free an SRPT I/O context structure. 645 */ 646 static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx, 647 int dma_size, enum dma_data_direction dir) 648 { 649 if (!ioctx) 650 return; 651 652 ib_dma_unmap_single(sdev->device, ioctx->dma, dma_size, dir); 653 kfree(ioctx->buf); 654 kfree(ioctx); 655 } 656 657 /** 658 * srpt_alloc_ioctx_ring() - Allocate a ring of SRPT I/O context structures. 659 * @sdev: Device to allocate the I/O context ring for. 660 * @ring_size: Number of elements in the I/O context ring. 661 * @ioctx_size: I/O context size. 662 * @dma_size: DMA buffer size. 663 * @dir: DMA data direction. 664 */ 665 static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev, 666 int ring_size, int ioctx_size, 667 int dma_size, enum dma_data_direction dir) 668 { 669 struct srpt_ioctx **ring; 670 int i; 671 672 WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx) 673 && ioctx_size != sizeof(struct srpt_send_ioctx)); 674 675 ring = kmalloc(ring_size * sizeof(ring[0]), GFP_KERNEL); 676 if (!ring) 677 goto out; 678 for (i = 0; i < ring_size; ++i) { 679 ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, dma_size, dir); 680 if (!ring[i]) 681 goto err; 682 ring[i]->index = i; 683 } 684 goto out; 685 686 err: 687 while (--i >= 0) 688 srpt_free_ioctx(sdev, ring[i], dma_size, dir); 689 kfree(ring); 690 ring = NULL; 691 out: 692 return ring; 693 } 694 695 /** 696 * srpt_free_ioctx_ring() - Free the ring of SRPT I/O context structures. 697 */ 698 static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring, 699 struct srpt_device *sdev, int ring_size, 700 int dma_size, enum dma_data_direction dir) 701 { 702 int i; 703 704 for (i = 0; i < ring_size; ++i) 705 srpt_free_ioctx(sdev, ioctx_ring[i], dma_size, dir); 706 kfree(ioctx_ring); 707 } 708 709 /** 710 * srpt_get_cmd_state() - Get the state of a SCSI command. 711 */ 712 static enum srpt_command_state srpt_get_cmd_state(struct srpt_send_ioctx *ioctx) 713 { 714 enum srpt_command_state state; 715 unsigned long flags; 716 717 BUG_ON(!ioctx); 718 719 spin_lock_irqsave(&ioctx->spinlock, flags); 720 state = ioctx->state; 721 spin_unlock_irqrestore(&ioctx->spinlock, flags); 722 return state; 723 } 724 725 /** 726 * srpt_set_cmd_state() - Set the state of a SCSI command. 727 * 728 * Does not modify the state of aborted commands. Returns the previous command 729 * state. 730 */ 731 static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx, 732 enum srpt_command_state new) 733 { 734 enum srpt_command_state previous; 735 unsigned long flags; 736 737 BUG_ON(!ioctx); 738 739 spin_lock_irqsave(&ioctx->spinlock, flags); 740 previous = ioctx->state; 741 if (previous != SRPT_STATE_DONE) 742 ioctx->state = new; 743 spin_unlock_irqrestore(&ioctx->spinlock, flags); 744 745 return previous; 746 } 747 748 /** 749 * srpt_test_and_set_cmd_state() - Test and set the state of a command. 750 * 751 * Returns true if and only if the previous command state was equal to 'old'. 752 */ 753 static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx, 754 enum srpt_command_state old, 755 enum srpt_command_state new) 756 { 757 enum srpt_command_state previous; 758 unsigned long flags; 759 760 WARN_ON(!ioctx); 761 WARN_ON(old == SRPT_STATE_DONE); 762 WARN_ON(new == SRPT_STATE_NEW); 763 764 spin_lock_irqsave(&ioctx->spinlock, flags); 765 previous = ioctx->state; 766 if (previous == old) 767 ioctx->state = new; 768 spin_unlock_irqrestore(&ioctx->spinlock, flags); 769 return previous == old; 770 } 771 772 /** 773 * srpt_post_recv() - Post an IB receive request. 774 */ 775 static int srpt_post_recv(struct srpt_device *sdev, 776 struct srpt_recv_ioctx *ioctx) 777 { 778 struct ib_sge list; 779 struct ib_recv_wr wr, *bad_wr; 780 781 BUG_ON(!sdev); 782 wr.wr_id = encode_wr_id(SRPT_RECV, ioctx->ioctx.index); 783 784 list.addr = ioctx->ioctx.dma; 785 list.length = srp_max_req_size; 786 list.lkey = sdev->mr->lkey; 787 788 wr.next = NULL; 789 wr.sg_list = &list; 790 wr.num_sge = 1; 791 792 return ib_post_srq_recv(sdev->srq, &wr, &bad_wr); 793 } 794 795 /** 796 * srpt_post_send() - Post an IB send request. 797 * 798 * Returns zero upon success and a non-zero value upon failure. 799 */ 800 static int srpt_post_send(struct srpt_rdma_ch *ch, 801 struct srpt_send_ioctx *ioctx, int len) 802 { 803 struct ib_sge list; 804 struct ib_send_wr wr, *bad_wr; 805 struct srpt_device *sdev = ch->sport->sdev; 806 int ret; 807 808 atomic_inc(&ch->req_lim); 809 810 ret = -ENOMEM; 811 if (unlikely(atomic_dec_return(&ch->sq_wr_avail) < 0)) { 812 printk(KERN_WARNING "IB send queue full (needed 1)\n"); 813 goto out; 814 } 815 816 ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, len, 817 DMA_TO_DEVICE); 818 819 list.addr = ioctx->ioctx.dma; 820 list.length = len; 821 list.lkey = sdev->mr->lkey; 822 823 wr.next = NULL; 824 wr.wr_id = encode_wr_id(SRPT_SEND, ioctx->ioctx.index); 825 wr.sg_list = &list; 826 wr.num_sge = 1; 827 wr.opcode = IB_WR_SEND; 828 wr.send_flags = IB_SEND_SIGNALED; 829 830 ret = ib_post_send(ch->qp, &wr, &bad_wr); 831 832 out: 833 if (ret < 0) { 834 atomic_inc(&ch->sq_wr_avail); 835 atomic_dec(&ch->req_lim); 836 } 837 return ret; 838 } 839 840 /** 841 * srpt_get_desc_tbl() - Parse the data descriptors of an SRP_CMD request. 842 * @ioctx: Pointer to the I/O context associated with the request. 843 * @srp_cmd: Pointer to the SRP_CMD request data. 844 * @dir: Pointer to the variable to which the transfer direction will be 845 * written. 846 * @data_len: Pointer to the variable to which the total data length of all 847 * descriptors in the SRP_CMD request will be written. 848 * 849 * This function initializes ioctx->nrbuf and ioctx->r_bufs. 850 * 851 * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors; 852 * -ENOMEM when memory allocation fails and zero upon success. 853 */ 854 static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx, 855 struct srp_cmd *srp_cmd, 856 enum dma_data_direction *dir, u64 *data_len) 857 { 858 struct srp_indirect_buf *idb; 859 struct srp_direct_buf *db; 860 unsigned add_cdb_offset; 861 int ret; 862 863 /* 864 * The pointer computations below will only be compiled correctly 865 * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check 866 * whether srp_cmd::add_data has been declared as a byte pointer. 867 */ 868 BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0) 869 && !__same_type(srp_cmd->add_data[0], (u8)0)); 870 871 BUG_ON(!dir); 872 BUG_ON(!data_len); 873 874 ret = 0; 875 *data_len = 0; 876 877 /* 878 * The lower four bits of the buffer format field contain the DATA-IN 879 * buffer descriptor format, and the highest four bits contain the 880 * DATA-OUT buffer descriptor format. 881 */ 882 *dir = DMA_NONE; 883 if (srp_cmd->buf_fmt & 0xf) 884 /* DATA-IN: transfer data from target to initiator (read). */ 885 *dir = DMA_FROM_DEVICE; 886 else if (srp_cmd->buf_fmt >> 4) 887 /* DATA-OUT: transfer data from initiator to target (write). */ 888 *dir = DMA_TO_DEVICE; 889 890 /* 891 * According to the SRP spec, the lower two bits of the 'ADDITIONAL 892 * CDB LENGTH' field are reserved and the size in bytes of this field 893 * is four times the value specified in bits 3..7. Hence the "& ~3". 894 */ 895 add_cdb_offset = srp_cmd->add_cdb_len & ~3; 896 if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) || 897 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) { 898 ioctx->n_rbuf = 1; 899 ioctx->rbufs = &ioctx->single_rbuf; 900 901 db = (struct srp_direct_buf *)(srp_cmd->add_data 902 + add_cdb_offset); 903 memcpy(ioctx->rbufs, db, sizeof *db); 904 *data_len = be32_to_cpu(db->len); 905 } else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) || 906 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) { 907 idb = (struct srp_indirect_buf *)(srp_cmd->add_data 908 + add_cdb_offset); 909 910 ioctx->n_rbuf = be32_to_cpu(idb->table_desc.len) / sizeof *db; 911 912 if (ioctx->n_rbuf > 913 (srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) { 914 printk(KERN_ERR "received unsupported SRP_CMD request" 915 " type (%u out + %u in != %u / %zu)\n", 916 srp_cmd->data_out_desc_cnt, 917 srp_cmd->data_in_desc_cnt, 918 be32_to_cpu(idb->table_desc.len), 919 sizeof(*db)); 920 ioctx->n_rbuf = 0; 921 ret = -EINVAL; 922 goto out; 923 } 924 925 if (ioctx->n_rbuf == 1) 926 ioctx->rbufs = &ioctx->single_rbuf; 927 else { 928 ioctx->rbufs = 929 kmalloc(ioctx->n_rbuf * sizeof *db, GFP_ATOMIC); 930 if (!ioctx->rbufs) { 931 ioctx->n_rbuf = 0; 932 ret = -ENOMEM; 933 goto out; 934 } 935 } 936 937 db = idb->desc_list; 938 memcpy(ioctx->rbufs, db, ioctx->n_rbuf * sizeof *db); 939 *data_len = be32_to_cpu(idb->len); 940 } 941 out: 942 return ret; 943 } 944 945 /** 946 * srpt_init_ch_qp() - Initialize queue pair attributes. 947 * 948 * Initialized the attributes of queue pair 'qp' by allowing local write, 949 * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT. 950 */ 951 static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp) 952 { 953 struct ib_qp_attr *attr; 954 int ret; 955 956 attr = kzalloc(sizeof *attr, GFP_KERNEL); 957 if (!attr) 958 return -ENOMEM; 959 960 attr->qp_state = IB_QPS_INIT; 961 attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ | 962 IB_ACCESS_REMOTE_WRITE; 963 attr->port_num = ch->sport->port; 964 attr->pkey_index = 0; 965 966 ret = ib_modify_qp(qp, attr, 967 IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT | 968 IB_QP_PKEY_INDEX); 969 970 kfree(attr); 971 return ret; 972 } 973 974 /** 975 * srpt_ch_qp_rtr() - Change the state of a channel to 'ready to receive' (RTR). 976 * @ch: channel of the queue pair. 977 * @qp: queue pair to change the state of. 978 * 979 * Returns zero upon success and a negative value upon failure. 980 * 981 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system. 982 * If this structure ever becomes larger, it might be necessary to allocate 983 * it dynamically instead of on the stack. 984 */ 985 static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp) 986 { 987 struct ib_qp_attr qp_attr; 988 int attr_mask; 989 int ret; 990 991 qp_attr.qp_state = IB_QPS_RTR; 992 ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask); 993 if (ret) 994 goto out; 995 996 qp_attr.max_dest_rd_atomic = 4; 997 998 ret = ib_modify_qp(qp, &qp_attr, attr_mask); 999 1000 out: 1001 return ret; 1002 } 1003 1004 /** 1005 * srpt_ch_qp_rts() - Change the state of a channel to 'ready to send' (RTS). 1006 * @ch: channel of the queue pair. 1007 * @qp: queue pair to change the state of. 1008 * 1009 * Returns zero upon success and a negative value upon failure. 1010 * 1011 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system. 1012 * If this structure ever becomes larger, it might be necessary to allocate 1013 * it dynamically instead of on the stack. 1014 */ 1015 static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp) 1016 { 1017 struct ib_qp_attr qp_attr; 1018 int attr_mask; 1019 int ret; 1020 1021 qp_attr.qp_state = IB_QPS_RTS; 1022 ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask); 1023 if (ret) 1024 goto out; 1025 1026 qp_attr.max_rd_atomic = 4; 1027 1028 ret = ib_modify_qp(qp, &qp_attr, attr_mask); 1029 1030 out: 1031 return ret; 1032 } 1033 1034 /** 1035 * srpt_ch_qp_err() - Set the channel queue pair state to 'error'. 1036 */ 1037 static int srpt_ch_qp_err(struct srpt_rdma_ch *ch) 1038 { 1039 struct ib_qp_attr qp_attr; 1040 1041 qp_attr.qp_state = IB_QPS_ERR; 1042 return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE); 1043 } 1044 1045 /** 1046 * srpt_unmap_sg_to_ib_sge() - Unmap an IB SGE list. 1047 */ 1048 static void srpt_unmap_sg_to_ib_sge(struct srpt_rdma_ch *ch, 1049 struct srpt_send_ioctx *ioctx) 1050 { 1051 struct scatterlist *sg; 1052 enum dma_data_direction dir; 1053 1054 BUG_ON(!ch); 1055 BUG_ON(!ioctx); 1056 BUG_ON(ioctx->n_rdma && !ioctx->rdma_ius); 1057 1058 while (ioctx->n_rdma) 1059 kfree(ioctx->rdma_ius[--ioctx->n_rdma].sge); 1060 1061 kfree(ioctx->rdma_ius); 1062 ioctx->rdma_ius = NULL; 1063 1064 if (ioctx->mapped_sg_count) { 1065 sg = ioctx->sg; 1066 WARN_ON(!sg); 1067 dir = ioctx->cmd.data_direction; 1068 BUG_ON(dir == DMA_NONE); 1069 ib_dma_unmap_sg(ch->sport->sdev->device, sg, ioctx->sg_cnt, 1070 opposite_dma_dir(dir)); 1071 ioctx->mapped_sg_count = 0; 1072 } 1073 } 1074 1075 /** 1076 * srpt_map_sg_to_ib_sge() - Map an SG list to an IB SGE list. 1077 */ 1078 static int srpt_map_sg_to_ib_sge(struct srpt_rdma_ch *ch, 1079 struct srpt_send_ioctx *ioctx) 1080 { 1081 struct se_cmd *cmd; 1082 struct scatterlist *sg, *sg_orig; 1083 int sg_cnt; 1084 enum dma_data_direction dir; 1085 struct rdma_iu *riu; 1086 struct srp_direct_buf *db; 1087 dma_addr_t dma_addr; 1088 struct ib_sge *sge; 1089 u64 raddr; 1090 u32 rsize; 1091 u32 tsize; 1092 u32 dma_len; 1093 int count, nrdma; 1094 int i, j, k; 1095 1096 BUG_ON(!ch); 1097 BUG_ON(!ioctx); 1098 cmd = &ioctx->cmd; 1099 dir = cmd->data_direction; 1100 BUG_ON(dir == DMA_NONE); 1101 1102 transport_do_task_sg_chain(cmd); 1103 ioctx->sg = sg = sg_orig = cmd->t_tasks_sg_chained; 1104 ioctx->sg_cnt = sg_cnt = cmd->t_tasks_sg_chained_no; 1105 1106 count = ib_dma_map_sg(ch->sport->sdev->device, sg, sg_cnt, 1107 opposite_dma_dir(dir)); 1108 if (unlikely(!count)) 1109 return -EAGAIN; 1110 1111 ioctx->mapped_sg_count = count; 1112 1113 if (ioctx->rdma_ius && ioctx->n_rdma_ius) 1114 nrdma = ioctx->n_rdma_ius; 1115 else { 1116 nrdma = (count + SRPT_DEF_SG_PER_WQE - 1) / SRPT_DEF_SG_PER_WQE 1117 + ioctx->n_rbuf; 1118 1119 ioctx->rdma_ius = kzalloc(nrdma * sizeof *riu, GFP_KERNEL); 1120 if (!ioctx->rdma_ius) 1121 goto free_mem; 1122 1123 ioctx->n_rdma_ius = nrdma; 1124 } 1125 1126 db = ioctx->rbufs; 1127 tsize = cmd->data_length; 1128 dma_len = sg_dma_len(&sg[0]); 1129 riu = ioctx->rdma_ius; 1130 1131 /* 1132 * For each remote desc - calculate the #ib_sge. 1133 * If #ib_sge < SRPT_DEF_SG_PER_WQE per rdma operation then 1134 * each remote desc rdma_iu is required a rdma wr; 1135 * else 1136 * we need to allocate extra rdma_iu to carry extra #ib_sge in 1137 * another rdma wr 1138 */ 1139 for (i = 0, j = 0; 1140 j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) { 1141 rsize = be32_to_cpu(db->len); 1142 raddr = be64_to_cpu(db->va); 1143 riu->raddr = raddr; 1144 riu->rkey = be32_to_cpu(db->key); 1145 riu->sge_cnt = 0; 1146 1147 /* calculate how many sge required for this remote_buf */ 1148 while (rsize > 0 && tsize > 0) { 1149 1150 if (rsize >= dma_len) { 1151 tsize -= dma_len; 1152 rsize -= dma_len; 1153 raddr += dma_len; 1154 1155 if (tsize > 0) { 1156 ++j; 1157 if (j < count) { 1158 sg = sg_next(sg); 1159 dma_len = sg_dma_len(sg); 1160 } 1161 } 1162 } else { 1163 tsize -= rsize; 1164 dma_len -= rsize; 1165 rsize = 0; 1166 } 1167 1168 ++riu->sge_cnt; 1169 1170 if (rsize > 0 && riu->sge_cnt == SRPT_DEF_SG_PER_WQE) { 1171 ++ioctx->n_rdma; 1172 riu->sge = 1173 kmalloc(riu->sge_cnt * sizeof *riu->sge, 1174 GFP_KERNEL); 1175 if (!riu->sge) 1176 goto free_mem; 1177 1178 ++riu; 1179 riu->sge_cnt = 0; 1180 riu->raddr = raddr; 1181 riu->rkey = be32_to_cpu(db->key); 1182 } 1183 } 1184 1185 ++ioctx->n_rdma; 1186 riu->sge = kmalloc(riu->sge_cnt * sizeof *riu->sge, 1187 GFP_KERNEL); 1188 if (!riu->sge) 1189 goto free_mem; 1190 } 1191 1192 db = ioctx->rbufs; 1193 tsize = cmd->data_length; 1194 riu = ioctx->rdma_ius; 1195 sg = sg_orig; 1196 dma_len = sg_dma_len(&sg[0]); 1197 dma_addr = sg_dma_address(&sg[0]); 1198 1199 /* this second loop is really mapped sg_addres to rdma_iu->ib_sge */ 1200 for (i = 0, j = 0; 1201 j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) { 1202 rsize = be32_to_cpu(db->len); 1203 sge = riu->sge; 1204 k = 0; 1205 1206 while (rsize > 0 && tsize > 0) { 1207 sge->addr = dma_addr; 1208 sge->lkey = ch->sport->sdev->mr->lkey; 1209 1210 if (rsize >= dma_len) { 1211 sge->length = 1212 (tsize < dma_len) ? tsize : dma_len; 1213 tsize -= dma_len; 1214 rsize -= dma_len; 1215 1216 if (tsize > 0) { 1217 ++j; 1218 if (j < count) { 1219 sg = sg_next(sg); 1220 dma_len = sg_dma_len(sg); 1221 dma_addr = sg_dma_address(sg); 1222 } 1223 } 1224 } else { 1225 sge->length = (tsize < rsize) ? tsize : rsize; 1226 tsize -= rsize; 1227 dma_len -= rsize; 1228 dma_addr += rsize; 1229 rsize = 0; 1230 } 1231 1232 ++k; 1233 if (k == riu->sge_cnt && rsize > 0 && tsize > 0) { 1234 ++riu; 1235 sge = riu->sge; 1236 k = 0; 1237 } else if (rsize > 0 && tsize > 0) 1238 ++sge; 1239 } 1240 } 1241 1242 return 0; 1243 1244 free_mem: 1245 srpt_unmap_sg_to_ib_sge(ch, ioctx); 1246 1247 return -ENOMEM; 1248 } 1249 1250 /** 1251 * srpt_get_send_ioctx() - Obtain an I/O context for sending to the initiator. 1252 */ 1253 static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch) 1254 { 1255 struct srpt_send_ioctx *ioctx; 1256 unsigned long flags; 1257 1258 BUG_ON(!ch); 1259 1260 ioctx = NULL; 1261 spin_lock_irqsave(&ch->spinlock, flags); 1262 if (!list_empty(&ch->free_list)) { 1263 ioctx = list_first_entry(&ch->free_list, 1264 struct srpt_send_ioctx, free_list); 1265 list_del(&ioctx->free_list); 1266 } 1267 spin_unlock_irqrestore(&ch->spinlock, flags); 1268 1269 if (!ioctx) 1270 return ioctx; 1271 1272 BUG_ON(ioctx->ch != ch); 1273 kref_init(&ioctx->kref); 1274 spin_lock_init(&ioctx->spinlock); 1275 ioctx->state = SRPT_STATE_NEW; 1276 ioctx->n_rbuf = 0; 1277 ioctx->rbufs = NULL; 1278 ioctx->n_rdma = 0; 1279 ioctx->n_rdma_ius = 0; 1280 ioctx->rdma_ius = NULL; 1281 ioctx->mapped_sg_count = 0; 1282 init_completion(&ioctx->tx_done); 1283 ioctx->queue_status_only = false; 1284 /* 1285 * transport_init_se_cmd() does not initialize all fields, so do it 1286 * here. 1287 */ 1288 memset(&ioctx->cmd, 0, sizeof(ioctx->cmd)); 1289 memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data)); 1290 1291 return ioctx; 1292 } 1293 1294 /** 1295 * srpt_put_send_ioctx() - Free up resources. 1296 */ 1297 static void srpt_put_send_ioctx(struct srpt_send_ioctx *ioctx) 1298 { 1299 struct srpt_rdma_ch *ch; 1300 unsigned long flags; 1301 1302 BUG_ON(!ioctx); 1303 ch = ioctx->ch; 1304 BUG_ON(!ch); 1305 1306 WARN_ON(srpt_get_cmd_state(ioctx) != SRPT_STATE_DONE); 1307 1308 srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx); 1309 transport_generic_free_cmd(&ioctx->cmd, 0); 1310 1311 if (ioctx->n_rbuf > 1) { 1312 kfree(ioctx->rbufs); 1313 ioctx->rbufs = NULL; 1314 ioctx->n_rbuf = 0; 1315 } 1316 1317 spin_lock_irqsave(&ch->spinlock, flags); 1318 list_add(&ioctx->free_list, &ch->free_list); 1319 spin_unlock_irqrestore(&ch->spinlock, flags); 1320 } 1321 1322 static void srpt_put_send_ioctx_kref(struct kref *kref) 1323 { 1324 srpt_put_send_ioctx(container_of(kref, struct srpt_send_ioctx, kref)); 1325 } 1326 1327 /** 1328 * srpt_abort_cmd() - Abort a SCSI command. 1329 * @ioctx: I/O context associated with the SCSI command. 1330 * @context: Preferred execution context. 1331 */ 1332 static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx) 1333 { 1334 enum srpt_command_state state; 1335 unsigned long flags; 1336 1337 BUG_ON(!ioctx); 1338 1339 /* 1340 * If the command is in a state where the target core is waiting for 1341 * the ib_srpt driver, change the state to the next state. Changing 1342 * the state of the command from SRPT_STATE_NEED_DATA to 1343 * SRPT_STATE_DATA_IN ensures that srpt_xmit_response() will call this 1344 * function a second time. 1345 */ 1346 1347 spin_lock_irqsave(&ioctx->spinlock, flags); 1348 state = ioctx->state; 1349 switch (state) { 1350 case SRPT_STATE_NEED_DATA: 1351 ioctx->state = SRPT_STATE_DATA_IN; 1352 break; 1353 case SRPT_STATE_DATA_IN: 1354 case SRPT_STATE_CMD_RSP_SENT: 1355 case SRPT_STATE_MGMT_RSP_SENT: 1356 ioctx->state = SRPT_STATE_DONE; 1357 break; 1358 default: 1359 break; 1360 } 1361 spin_unlock_irqrestore(&ioctx->spinlock, flags); 1362 1363 if (state == SRPT_STATE_DONE) 1364 goto out; 1365 1366 pr_debug("Aborting cmd with state %d and tag %lld\n", state, 1367 ioctx->tag); 1368 1369 switch (state) { 1370 case SRPT_STATE_NEW: 1371 case SRPT_STATE_DATA_IN: 1372 case SRPT_STATE_MGMT: 1373 /* 1374 * Do nothing - defer abort processing until 1375 * srpt_queue_response() is invoked. 1376 */ 1377 WARN_ON(!transport_check_aborted_status(&ioctx->cmd, false)); 1378 break; 1379 case SRPT_STATE_NEED_DATA: 1380 /* DMA_TO_DEVICE (write) - RDMA read error. */ 1381 spin_lock_irqsave(&ioctx->cmd.t_state_lock, flags); 1382 ioctx->cmd.transport_state |= CMD_T_LUN_STOP; 1383 spin_unlock_irqrestore(&ioctx->cmd.t_state_lock, flags); 1384 transport_generic_handle_data(&ioctx->cmd); 1385 break; 1386 case SRPT_STATE_CMD_RSP_SENT: 1387 /* 1388 * SRP_RSP sending failed or the SRP_RSP send completion has 1389 * not been received in time. 1390 */ 1391 srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx); 1392 spin_lock_irqsave(&ioctx->cmd.t_state_lock, flags); 1393 ioctx->cmd.transport_state |= CMD_T_LUN_STOP; 1394 spin_unlock_irqrestore(&ioctx->cmd.t_state_lock, flags); 1395 kref_put(&ioctx->kref, srpt_put_send_ioctx_kref); 1396 break; 1397 case SRPT_STATE_MGMT_RSP_SENT: 1398 srpt_set_cmd_state(ioctx, SRPT_STATE_DONE); 1399 kref_put(&ioctx->kref, srpt_put_send_ioctx_kref); 1400 break; 1401 default: 1402 WARN_ON("ERROR: unexpected command state"); 1403 break; 1404 } 1405 1406 out: 1407 return state; 1408 } 1409 1410 /** 1411 * srpt_handle_send_err_comp() - Process an IB_WC_SEND error completion. 1412 */ 1413 static void srpt_handle_send_err_comp(struct srpt_rdma_ch *ch, u64 wr_id) 1414 { 1415 struct srpt_send_ioctx *ioctx; 1416 enum srpt_command_state state; 1417 struct se_cmd *cmd; 1418 u32 index; 1419 1420 atomic_inc(&ch->sq_wr_avail); 1421 1422 index = idx_from_wr_id(wr_id); 1423 ioctx = ch->ioctx_ring[index]; 1424 state = srpt_get_cmd_state(ioctx); 1425 cmd = &ioctx->cmd; 1426 1427 WARN_ON(state != SRPT_STATE_CMD_RSP_SENT 1428 && state != SRPT_STATE_MGMT_RSP_SENT 1429 && state != SRPT_STATE_NEED_DATA 1430 && state != SRPT_STATE_DONE); 1431 1432 /* If SRP_RSP sending failed, undo the ch->req_lim change. */ 1433 if (state == SRPT_STATE_CMD_RSP_SENT 1434 || state == SRPT_STATE_MGMT_RSP_SENT) 1435 atomic_dec(&ch->req_lim); 1436 1437 srpt_abort_cmd(ioctx); 1438 } 1439 1440 /** 1441 * srpt_handle_send_comp() - Process an IB send completion notification. 1442 */ 1443 static void srpt_handle_send_comp(struct srpt_rdma_ch *ch, 1444 struct srpt_send_ioctx *ioctx) 1445 { 1446 enum srpt_command_state state; 1447 1448 atomic_inc(&ch->sq_wr_avail); 1449 1450 state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE); 1451 1452 if (WARN_ON(state != SRPT_STATE_CMD_RSP_SENT 1453 && state != SRPT_STATE_MGMT_RSP_SENT 1454 && state != SRPT_STATE_DONE)) 1455 pr_debug("state = %d\n", state); 1456 1457 if (state != SRPT_STATE_DONE) 1458 kref_put(&ioctx->kref, srpt_put_send_ioctx_kref); 1459 else 1460 printk(KERN_ERR "IB completion has been received too late for" 1461 " wr_id = %u.\n", ioctx->ioctx.index); 1462 } 1463 1464 /** 1465 * srpt_handle_rdma_comp() - Process an IB RDMA completion notification. 1466 * 1467 * Note: transport_generic_handle_data() is asynchronous so unmapping the 1468 * data that has been transferred via IB RDMA must be postponed until the 1469 * check_stop_free() callback. 1470 */ 1471 static void srpt_handle_rdma_comp(struct srpt_rdma_ch *ch, 1472 struct srpt_send_ioctx *ioctx, 1473 enum srpt_opcode opcode) 1474 { 1475 WARN_ON(ioctx->n_rdma <= 0); 1476 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail); 1477 1478 if (opcode == SRPT_RDMA_READ_LAST) { 1479 if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA, 1480 SRPT_STATE_DATA_IN)) 1481 transport_generic_handle_data(&ioctx->cmd); 1482 else 1483 printk(KERN_ERR "%s[%d]: wrong state = %d\n", __func__, 1484 __LINE__, srpt_get_cmd_state(ioctx)); 1485 } else if (opcode == SRPT_RDMA_ABORT) { 1486 ioctx->rdma_aborted = true; 1487 } else { 1488 WARN(true, "unexpected opcode %d\n", opcode); 1489 } 1490 } 1491 1492 /** 1493 * srpt_handle_rdma_err_comp() - Process an IB RDMA error completion. 1494 */ 1495 static void srpt_handle_rdma_err_comp(struct srpt_rdma_ch *ch, 1496 struct srpt_send_ioctx *ioctx, 1497 enum srpt_opcode opcode) 1498 { 1499 struct se_cmd *cmd; 1500 enum srpt_command_state state; 1501 unsigned long flags; 1502 1503 cmd = &ioctx->cmd; 1504 state = srpt_get_cmd_state(ioctx); 1505 switch (opcode) { 1506 case SRPT_RDMA_READ_LAST: 1507 if (ioctx->n_rdma <= 0) { 1508 printk(KERN_ERR "Received invalid RDMA read" 1509 " error completion with idx %d\n", 1510 ioctx->ioctx.index); 1511 break; 1512 } 1513 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail); 1514 if (state == SRPT_STATE_NEED_DATA) 1515 srpt_abort_cmd(ioctx); 1516 else 1517 printk(KERN_ERR "%s[%d]: wrong state = %d\n", 1518 __func__, __LINE__, state); 1519 break; 1520 case SRPT_RDMA_WRITE_LAST: 1521 spin_lock_irqsave(&ioctx->cmd.t_state_lock, flags); 1522 ioctx->cmd.transport_state |= CMD_T_LUN_STOP; 1523 spin_unlock_irqrestore(&ioctx->cmd.t_state_lock, flags); 1524 break; 1525 default: 1526 printk(KERN_ERR "%s[%d]: opcode = %u\n", __func__, 1527 __LINE__, opcode); 1528 break; 1529 } 1530 } 1531 1532 /** 1533 * srpt_build_cmd_rsp() - Build an SRP_RSP response. 1534 * @ch: RDMA channel through which the request has been received. 1535 * @ioctx: I/O context associated with the SRP_CMD request. The response will 1536 * be built in the buffer ioctx->buf points at and hence this function will 1537 * overwrite the request data. 1538 * @tag: tag of the request for which this response is being generated. 1539 * @status: value for the STATUS field of the SRP_RSP information unit. 1540 * 1541 * Returns the size in bytes of the SRP_RSP response. 1542 * 1543 * An SRP_RSP response contains a SCSI status or service response. See also 1544 * section 6.9 in the SRP r16a document for the format of an SRP_RSP 1545 * response. See also SPC-2 for more information about sense data. 1546 */ 1547 static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch, 1548 struct srpt_send_ioctx *ioctx, u64 tag, 1549 int status) 1550 { 1551 struct srp_rsp *srp_rsp; 1552 const u8 *sense_data; 1553 int sense_data_len, max_sense_len; 1554 1555 /* 1556 * The lowest bit of all SAM-3 status codes is zero (see also 1557 * paragraph 5.3 in SAM-3). 1558 */ 1559 WARN_ON(status & 1); 1560 1561 srp_rsp = ioctx->ioctx.buf; 1562 BUG_ON(!srp_rsp); 1563 1564 sense_data = ioctx->sense_data; 1565 sense_data_len = ioctx->cmd.scsi_sense_length; 1566 WARN_ON(sense_data_len > sizeof(ioctx->sense_data)); 1567 1568 memset(srp_rsp, 0, sizeof *srp_rsp); 1569 srp_rsp->opcode = SRP_RSP; 1570 srp_rsp->req_lim_delta = 1571 __constant_cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0)); 1572 srp_rsp->tag = tag; 1573 srp_rsp->status = status; 1574 1575 if (sense_data_len) { 1576 BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp)); 1577 max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp); 1578 if (sense_data_len > max_sense_len) { 1579 printk(KERN_WARNING "truncated sense data from %d to %d" 1580 " bytes\n", sense_data_len, max_sense_len); 1581 sense_data_len = max_sense_len; 1582 } 1583 1584 srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID; 1585 srp_rsp->sense_data_len = cpu_to_be32(sense_data_len); 1586 memcpy(srp_rsp + 1, sense_data, sense_data_len); 1587 } 1588 1589 return sizeof(*srp_rsp) + sense_data_len; 1590 } 1591 1592 /** 1593 * srpt_build_tskmgmt_rsp() - Build a task management response. 1594 * @ch: RDMA channel through which the request has been received. 1595 * @ioctx: I/O context in which the SRP_RSP response will be built. 1596 * @rsp_code: RSP_CODE that will be stored in the response. 1597 * @tag: Tag of the request for which this response is being generated. 1598 * 1599 * Returns the size in bytes of the SRP_RSP response. 1600 * 1601 * An SRP_RSP response contains a SCSI status or service response. See also 1602 * section 6.9 in the SRP r16a document for the format of an SRP_RSP 1603 * response. 1604 */ 1605 static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch, 1606 struct srpt_send_ioctx *ioctx, 1607 u8 rsp_code, u64 tag) 1608 { 1609 struct srp_rsp *srp_rsp; 1610 int resp_data_len; 1611 int resp_len; 1612 1613 resp_data_len = (rsp_code == SRP_TSK_MGMT_SUCCESS) ? 0 : 4; 1614 resp_len = sizeof(*srp_rsp) + resp_data_len; 1615 1616 srp_rsp = ioctx->ioctx.buf; 1617 BUG_ON(!srp_rsp); 1618 memset(srp_rsp, 0, sizeof *srp_rsp); 1619 1620 srp_rsp->opcode = SRP_RSP; 1621 srp_rsp->req_lim_delta = __constant_cpu_to_be32(1 1622 + atomic_xchg(&ch->req_lim_delta, 0)); 1623 srp_rsp->tag = tag; 1624 1625 if (rsp_code != SRP_TSK_MGMT_SUCCESS) { 1626 srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID; 1627 srp_rsp->resp_data_len = cpu_to_be32(resp_data_len); 1628 srp_rsp->data[3] = rsp_code; 1629 } 1630 1631 return resp_len; 1632 } 1633 1634 #define NO_SUCH_LUN ((uint64_t)-1LL) 1635 1636 /* 1637 * SCSI LUN addressing method. See also SAM-2 and the section about 1638 * eight byte LUNs. 1639 */ 1640 enum scsi_lun_addr_method { 1641 SCSI_LUN_ADDR_METHOD_PERIPHERAL = 0, 1642 SCSI_LUN_ADDR_METHOD_FLAT = 1, 1643 SCSI_LUN_ADDR_METHOD_LUN = 2, 1644 SCSI_LUN_ADDR_METHOD_EXTENDED_LUN = 3, 1645 }; 1646 1647 /* 1648 * srpt_unpack_lun() - Convert from network LUN to linear LUN. 1649 * 1650 * Convert an 2-byte, 4-byte, 6-byte or 8-byte LUN structure in network byte 1651 * order (big endian) to a linear LUN. Supports three LUN addressing methods: 1652 * peripheral, flat and logical unit. See also SAM-2, section 4.9.4 (page 40). 1653 */ 1654 static uint64_t srpt_unpack_lun(const uint8_t *lun, int len) 1655 { 1656 uint64_t res = NO_SUCH_LUN; 1657 int addressing_method; 1658 1659 if (unlikely(len < 2)) { 1660 printk(KERN_ERR "Illegal LUN length %d, expected 2 bytes or " 1661 "more", len); 1662 goto out; 1663 } 1664 1665 switch (len) { 1666 case 8: 1667 if ((*((__be64 *)lun) & 1668 __constant_cpu_to_be64(0x0000FFFFFFFFFFFFLL)) != 0) 1669 goto out_err; 1670 break; 1671 case 4: 1672 if (*((__be16 *)&lun[2]) != 0) 1673 goto out_err; 1674 break; 1675 case 6: 1676 if (*((__be32 *)&lun[2]) != 0) 1677 goto out_err; 1678 break; 1679 case 2: 1680 break; 1681 default: 1682 goto out_err; 1683 } 1684 1685 addressing_method = (*lun) >> 6; /* highest two bits of byte 0 */ 1686 switch (addressing_method) { 1687 case SCSI_LUN_ADDR_METHOD_PERIPHERAL: 1688 case SCSI_LUN_ADDR_METHOD_FLAT: 1689 case SCSI_LUN_ADDR_METHOD_LUN: 1690 res = *(lun + 1) | (((*lun) & 0x3f) << 8); 1691 break; 1692 1693 case SCSI_LUN_ADDR_METHOD_EXTENDED_LUN: 1694 default: 1695 printk(KERN_ERR "Unimplemented LUN addressing method %u", 1696 addressing_method); 1697 break; 1698 } 1699 1700 out: 1701 return res; 1702 1703 out_err: 1704 printk(KERN_ERR "Support for multi-level LUNs has not yet been" 1705 " implemented"); 1706 goto out; 1707 } 1708 1709 static int srpt_check_stop_free(struct se_cmd *cmd) 1710 { 1711 struct srpt_send_ioctx *ioctx; 1712 1713 ioctx = container_of(cmd, struct srpt_send_ioctx, cmd); 1714 return kref_put(&ioctx->kref, srpt_put_send_ioctx_kref); 1715 } 1716 1717 /** 1718 * srpt_handle_cmd() - Process SRP_CMD. 1719 */ 1720 static int srpt_handle_cmd(struct srpt_rdma_ch *ch, 1721 struct srpt_recv_ioctx *recv_ioctx, 1722 struct srpt_send_ioctx *send_ioctx) 1723 { 1724 struct se_cmd *cmd; 1725 struct srp_cmd *srp_cmd; 1726 uint64_t unpacked_lun; 1727 u64 data_len; 1728 enum dma_data_direction dir; 1729 int ret; 1730 1731 BUG_ON(!send_ioctx); 1732 1733 srp_cmd = recv_ioctx->ioctx.buf; 1734 kref_get(&send_ioctx->kref); 1735 cmd = &send_ioctx->cmd; 1736 send_ioctx->tag = srp_cmd->tag; 1737 1738 switch (srp_cmd->task_attr) { 1739 case SRP_CMD_SIMPLE_Q: 1740 cmd->sam_task_attr = MSG_SIMPLE_TAG; 1741 break; 1742 case SRP_CMD_ORDERED_Q: 1743 default: 1744 cmd->sam_task_attr = MSG_ORDERED_TAG; 1745 break; 1746 case SRP_CMD_HEAD_OF_Q: 1747 cmd->sam_task_attr = MSG_HEAD_TAG; 1748 break; 1749 case SRP_CMD_ACA: 1750 cmd->sam_task_attr = MSG_ACA_TAG; 1751 break; 1752 } 1753 1754 ret = srpt_get_desc_tbl(send_ioctx, srp_cmd, &dir, &data_len); 1755 if (ret) { 1756 printk(KERN_ERR "0x%llx: parsing SRP descriptor table failed.\n", 1757 srp_cmd->tag); 1758 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1759 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 1760 goto send_sense; 1761 } 1762 1763 cmd->data_length = data_len; 1764 cmd->data_direction = dir; 1765 unpacked_lun = srpt_unpack_lun((uint8_t *)&srp_cmd->lun, 1766 sizeof(srp_cmd->lun)); 1767 if (transport_lookup_cmd_lun(cmd, unpacked_lun) < 0) 1768 goto send_sense; 1769 ret = transport_generic_allocate_tasks(cmd, srp_cmd->cdb); 1770 if (cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT) 1771 srpt_queue_status(cmd); 1772 else if (cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION) 1773 goto send_sense; 1774 else 1775 WARN_ON_ONCE(ret); 1776 1777 transport_handle_cdb_direct(cmd); 1778 return 0; 1779 1780 send_sense: 1781 transport_send_check_condition_and_sense(cmd, cmd->scsi_sense_reason, 1782 0); 1783 return -1; 1784 } 1785 1786 /** 1787 * srpt_rx_mgmt_fn_tag() - Process a task management function by tag. 1788 * @ch: RDMA channel of the task management request. 1789 * @fn: Task management function to perform. 1790 * @req_tag: Tag of the SRP task management request. 1791 * @mgmt_ioctx: I/O context of the task management request. 1792 * 1793 * Returns zero if the target core will process the task management 1794 * request asynchronously. 1795 * 1796 * Note: It is assumed that the initiator serializes tag-based task management 1797 * requests. 1798 */ 1799 static int srpt_rx_mgmt_fn_tag(struct srpt_send_ioctx *ioctx, u64 tag) 1800 { 1801 struct srpt_device *sdev; 1802 struct srpt_rdma_ch *ch; 1803 struct srpt_send_ioctx *target; 1804 int ret, i; 1805 1806 ret = -EINVAL; 1807 ch = ioctx->ch; 1808 BUG_ON(!ch); 1809 BUG_ON(!ch->sport); 1810 sdev = ch->sport->sdev; 1811 BUG_ON(!sdev); 1812 spin_lock_irq(&sdev->spinlock); 1813 for (i = 0; i < ch->rq_size; ++i) { 1814 target = ch->ioctx_ring[i]; 1815 if (target->cmd.se_lun == ioctx->cmd.se_lun && 1816 target->tag == tag && 1817 srpt_get_cmd_state(target) != SRPT_STATE_DONE) { 1818 ret = 0; 1819 /* now let the target core abort &target->cmd; */ 1820 break; 1821 } 1822 } 1823 spin_unlock_irq(&sdev->spinlock); 1824 return ret; 1825 } 1826 1827 static int srp_tmr_to_tcm(int fn) 1828 { 1829 switch (fn) { 1830 case SRP_TSK_ABORT_TASK: 1831 return TMR_ABORT_TASK; 1832 case SRP_TSK_ABORT_TASK_SET: 1833 return TMR_ABORT_TASK_SET; 1834 case SRP_TSK_CLEAR_TASK_SET: 1835 return TMR_CLEAR_TASK_SET; 1836 case SRP_TSK_LUN_RESET: 1837 return TMR_LUN_RESET; 1838 case SRP_TSK_CLEAR_ACA: 1839 return TMR_CLEAR_ACA; 1840 default: 1841 return -1; 1842 } 1843 } 1844 1845 /** 1846 * srpt_handle_tsk_mgmt() - Process an SRP_TSK_MGMT information unit. 1847 * 1848 * Returns 0 if and only if the request will be processed by the target core. 1849 * 1850 * For more information about SRP_TSK_MGMT information units, see also section 1851 * 6.7 in the SRP r16a document. 1852 */ 1853 static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch, 1854 struct srpt_recv_ioctx *recv_ioctx, 1855 struct srpt_send_ioctx *send_ioctx) 1856 { 1857 struct srp_tsk_mgmt *srp_tsk; 1858 struct se_cmd *cmd; 1859 uint64_t unpacked_lun; 1860 int tcm_tmr; 1861 int res; 1862 1863 BUG_ON(!send_ioctx); 1864 1865 srp_tsk = recv_ioctx->ioctx.buf; 1866 cmd = &send_ioctx->cmd; 1867 1868 pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld" 1869 " cm_id %p sess %p\n", srp_tsk->tsk_mgmt_func, 1870 srp_tsk->task_tag, srp_tsk->tag, ch->cm_id, ch->sess); 1871 1872 srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT); 1873 send_ioctx->tag = srp_tsk->tag; 1874 tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func); 1875 if (tcm_tmr < 0) { 1876 send_ioctx->cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1877 send_ioctx->cmd.se_tmr_req->response = 1878 TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; 1879 goto process_tmr; 1880 } 1881 cmd->se_tmr_req = core_tmr_alloc_req(cmd, NULL, tcm_tmr, GFP_KERNEL); 1882 if (!cmd->se_tmr_req) { 1883 send_ioctx->cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1884 send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED; 1885 goto process_tmr; 1886 } 1887 1888 unpacked_lun = srpt_unpack_lun((uint8_t *)&srp_tsk->lun, 1889 sizeof(srp_tsk->lun)); 1890 res = transport_lookup_tmr_lun(&send_ioctx->cmd, unpacked_lun); 1891 if (res) { 1892 pr_debug("rejecting TMR for LUN %lld\n", unpacked_lun); 1893 send_ioctx->cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1894 send_ioctx->cmd.se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; 1895 goto process_tmr; 1896 } 1897 1898 if (srp_tsk->tsk_mgmt_func == SRP_TSK_ABORT_TASK) 1899 srpt_rx_mgmt_fn_tag(send_ioctx, srp_tsk->task_tag); 1900 1901 process_tmr: 1902 kref_get(&send_ioctx->kref); 1903 if (!(send_ioctx->cmd.se_cmd_flags & SCF_SCSI_CDB_EXCEPTION)) 1904 transport_generic_handle_tmr(&send_ioctx->cmd); 1905 else 1906 transport_send_check_condition_and_sense(cmd, 1907 cmd->scsi_sense_reason, 0); 1908 1909 } 1910 1911 /** 1912 * srpt_handle_new_iu() - Process a newly received information unit. 1913 * @ch: RDMA channel through which the information unit has been received. 1914 * @ioctx: SRPT I/O context associated with the information unit. 1915 */ 1916 static void srpt_handle_new_iu(struct srpt_rdma_ch *ch, 1917 struct srpt_recv_ioctx *recv_ioctx, 1918 struct srpt_send_ioctx *send_ioctx) 1919 { 1920 struct srp_cmd *srp_cmd; 1921 enum rdma_ch_state ch_state; 1922 1923 BUG_ON(!ch); 1924 BUG_ON(!recv_ioctx); 1925 1926 ib_dma_sync_single_for_cpu(ch->sport->sdev->device, 1927 recv_ioctx->ioctx.dma, srp_max_req_size, 1928 DMA_FROM_DEVICE); 1929 1930 ch_state = srpt_get_ch_state(ch); 1931 if (unlikely(ch_state == CH_CONNECTING)) { 1932 list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list); 1933 goto out; 1934 } 1935 1936 if (unlikely(ch_state != CH_LIVE)) 1937 goto out; 1938 1939 srp_cmd = recv_ioctx->ioctx.buf; 1940 if (srp_cmd->opcode == SRP_CMD || srp_cmd->opcode == SRP_TSK_MGMT) { 1941 if (!send_ioctx) 1942 send_ioctx = srpt_get_send_ioctx(ch); 1943 if (unlikely(!send_ioctx)) { 1944 list_add_tail(&recv_ioctx->wait_list, 1945 &ch->cmd_wait_list); 1946 goto out; 1947 } 1948 } 1949 1950 transport_init_se_cmd(&send_ioctx->cmd, &srpt_target->tf_ops, ch->sess, 1951 0, DMA_NONE, MSG_SIMPLE_TAG, 1952 send_ioctx->sense_data); 1953 1954 switch (srp_cmd->opcode) { 1955 case SRP_CMD: 1956 srpt_handle_cmd(ch, recv_ioctx, send_ioctx); 1957 break; 1958 case SRP_TSK_MGMT: 1959 srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx); 1960 break; 1961 case SRP_I_LOGOUT: 1962 printk(KERN_ERR "Not yet implemented: SRP_I_LOGOUT\n"); 1963 break; 1964 case SRP_CRED_RSP: 1965 pr_debug("received SRP_CRED_RSP\n"); 1966 break; 1967 case SRP_AER_RSP: 1968 pr_debug("received SRP_AER_RSP\n"); 1969 break; 1970 case SRP_RSP: 1971 printk(KERN_ERR "Received SRP_RSP\n"); 1972 break; 1973 default: 1974 printk(KERN_ERR "received IU with unknown opcode 0x%x\n", 1975 srp_cmd->opcode); 1976 break; 1977 } 1978 1979 srpt_post_recv(ch->sport->sdev, recv_ioctx); 1980 out: 1981 return; 1982 } 1983 1984 static void srpt_process_rcv_completion(struct ib_cq *cq, 1985 struct srpt_rdma_ch *ch, 1986 struct ib_wc *wc) 1987 { 1988 struct srpt_device *sdev = ch->sport->sdev; 1989 struct srpt_recv_ioctx *ioctx; 1990 u32 index; 1991 1992 index = idx_from_wr_id(wc->wr_id); 1993 if (wc->status == IB_WC_SUCCESS) { 1994 int req_lim; 1995 1996 req_lim = atomic_dec_return(&ch->req_lim); 1997 if (unlikely(req_lim < 0)) 1998 printk(KERN_ERR "req_lim = %d < 0\n", req_lim); 1999 ioctx = sdev->ioctx_ring[index]; 2000 srpt_handle_new_iu(ch, ioctx, NULL); 2001 } else { 2002 printk(KERN_INFO "receiving failed for idx %u with status %d\n", 2003 index, wc->status); 2004 } 2005 } 2006 2007 /** 2008 * srpt_process_send_completion() - Process an IB send completion. 2009 * 2010 * Note: Although this has not yet been observed during tests, at least in 2011 * theory it is possible that the srpt_get_send_ioctx() call invoked by 2012 * srpt_handle_new_iu() fails. This is possible because the req_lim_delta 2013 * value in each response is set to one, and it is possible that this response 2014 * makes the initiator send a new request before the send completion for that 2015 * response has been processed. This could e.g. happen if the call to 2016 * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or 2017 * if IB retransmission causes generation of the send completion to be 2018 * delayed. Incoming information units for which srpt_get_send_ioctx() fails 2019 * are queued on cmd_wait_list. The code below processes these delayed 2020 * requests one at a time. 2021 */ 2022 static void srpt_process_send_completion(struct ib_cq *cq, 2023 struct srpt_rdma_ch *ch, 2024 struct ib_wc *wc) 2025 { 2026 struct srpt_send_ioctx *send_ioctx; 2027 uint32_t index; 2028 enum srpt_opcode opcode; 2029 2030 index = idx_from_wr_id(wc->wr_id); 2031 opcode = opcode_from_wr_id(wc->wr_id); 2032 send_ioctx = ch->ioctx_ring[index]; 2033 if (wc->status == IB_WC_SUCCESS) { 2034 if (opcode == SRPT_SEND) 2035 srpt_handle_send_comp(ch, send_ioctx); 2036 else { 2037 WARN_ON(opcode != SRPT_RDMA_ABORT && 2038 wc->opcode != IB_WC_RDMA_READ); 2039 srpt_handle_rdma_comp(ch, send_ioctx, opcode); 2040 } 2041 } else { 2042 if (opcode == SRPT_SEND) { 2043 printk(KERN_INFO "sending response for idx %u failed" 2044 " with status %d\n", index, wc->status); 2045 srpt_handle_send_err_comp(ch, wc->wr_id); 2046 } else if (opcode != SRPT_RDMA_MID) { 2047 printk(KERN_INFO "RDMA t %d for idx %u failed with" 2048 " status %d", opcode, index, wc->status); 2049 srpt_handle_rdma_err_comp(ch, send_ioctx, opcode); 2050 } 2051 } 2052 2053 while (unlikely(opcode == SRPT_SEND 2054 && !list_empty(&ch->cmd_wait_list) 2055 && srpt_get_ch_state(ch) == CH_LIVE 2056 && (send_ioctx = srpt_get_send_ioctx(ch)) != NULL)) { 2057 struct srpt_recv_ioctx *recv_ioctx; 2058 2059 recv_ioctx = list_first_entry(&ch->cmd_wait_list, 2060 struct srpt_recv_ioctx, 2061 wait_list); 2062 list_del(&recv_ioctx->wait_list); 2063 srpt_handle_new_iu(ch, recv_ioctx, send_ioctx); 2064 } 2065 } 2066 2067 static void srpt_process_completion(struct ib_cq *cq, struct srpt_rdma_ch *ch) 2068 { 2069 struct ib_wc *const wc = ch->wc; 2070 int i, n; 2071 2072 WARN_ON(cq != ch->cq); 2073 2074 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); 2075 while ((n = ib_poll_cq(cq, ARRAY_SIZE(ch->wc), wc)) > 0) { 2076 for (i = 0; i < n; i++) { 2077 if (opcode_from_wr_id(wc[i].wr_id) == SRPT_RECV) 2078 srpt_process_rcv_completion(cq, ch, &wc[i]); 2079 else 2080 srpt_process_send_completion(cq, ch, &wc[i]); 2081 } 2082 } 2083 } 2084 2085 /** 2086 * srpt_completion() - IB completion queue callback function. 2087 * 2088 * Notes: 2089 * - It is guaranteed that a completion handler will never be invoked 2090 * concurrently on two different CPUs for the same completion queue. See also 2091 * Documentation/infiniband/core_locking.txt and the implementation of 2092 * handle_edge_irq() in kernel/irq/chip.c. 2093 * - When threaded IRQs are enabled, completion handlers are invoked in thread 2094 * context instead of interrupt context. 2095 */ 2096 static void srpt_completion(struct ib_cq *cq, void *ctx) 2097 { 2098 struct srpt_rdma_ch *ch = ctx; 2099 2100 wake_up_interruptible(&ch->wait_queue); 2101 } 2102 2103 static int srpt_compl_thread(void *arg) 2104 { 2105 struct srpt_rdma_ch *ch; 2106 2107 /* Hibernation / freezing of the SRPT kernel thread is not supported. */ 2108 current->flags |= PF_NOFREEZE; 2109 2110 ch = arg; 2111 BUG_ON(!ch); 2112 printk(KERN_INFO "Session %s: kernel thread %s (PID %d) started\n", 2113 ch->sess_name, ch->thread->comm, current->pid); 2114 while (!kthread_should_stop()) { 2115 wait_event_interruptible(ch->wait_queue, 2116 (srpt_process_completion(ch->cq, ch), 2117 kthread_should_stop())); 2118 } 2119 printk(KERN_INFO "Session %s: kernel thread %s (PID %d) stopped\n", 2120 ch->sess_name, ch->thread->comm, current->pid); 2121 return 0; 2122 } 2123 2124 /** 2125 * srpt_create_ch_ib() - Create receive and send completion queues. 2126 */ 2127 static int srpt_create_ch_ib(struct srpt_rdma_ch *ch) 2128 { 2129 struct ib_qp_init_attr *qp_init; 2130 struct srpt_port *sport = ch->sport; 2131 struct srpt_device *sdev = sport->sdev; 2132 u32 srp_sq_size = sport->port_attrib.srp_sq_size; 2133 int ret; 2134 2135 WARN_ON(ch->rq_size < 1); 2136 2137 ret = -ENOMEM; 2138 qp_init = kzalloc(sizeof *qp_init, GFP_KERNEL); 2139 if (!qp_init) 2140 goto out; 2141 2142 ch->cq = ib_create_cq(sdev->device, srpt_completion, NULL, ch, 2143 ch->rq_size + srp_sq_size, 0); 2144 if (IS_ERR(ch->cq)) { 2145 ret = PTR_ERR(ch->cq); 2146 printk(KERN_ERR "failed to create CQ cqe= %d ret= %d\n", 2147 ch->rq_size + srp_sq_size, ret); 2148 goto out; 2149 } 2150 2151 qp_init->qp_context = (void *)ch; 2152 qp_init->event_handler 2153 = (void(*)(struct ib_event *, void*))srpt_qp_event; 2154 qp_init->send_cq = ch->cq; 2155 qp_init->recv_cq = ch->cq; 2156 qp_init->srq = sdev->srq; 2157 qp_init->sq_sig_type = IB_SIGNAL_REQ_WR; 2158 qp_init->qp_type = IB_QPT_RC; 2159 qp_init->cap.max_send_wr = srp_sq_size; 2160 qp_init->cap.max_send_sge = SRPT_DEF_SG_PER_WQE; 2161 2162 ch->qp = ib_create_qp(sdev->pd, qp_init); 2163 if (IS_ERR(ch->qp)) { 2164 ret = PTR_ERR(ch->qp); 2165 printk(KERN_ERR "failed to create_qp ret= %d\n", ret); 2166 goto err_destroy_cq; 2167 } 2168 2169 atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr); 2170 2171 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n", 2172 __func__, ch->cq->cqe, qp_init->cap.max_send_sge, 2173 qp_init->cap.max_send_wr, ch->cm_id); 2174 2175 ret = srpt_init_ch_qp(ch, ch->qp); 2176 if (ret) 2177 goto err_destroy_qp; 2178 2179 init_waitqueue_head(&ch->wait_queue); 2180 2181 pr_debug("creating thread for session %s\n", ch->sess_name); 2182 2183 ch->thread = kthread_run(srpt_compl_thread, ch, "ib_srpt_compl"); 2184 if (IS_ERR(ch->thread)) { 2185 printk(KERN_ERR "failed to create kernel thread %ld\n", 2186 PTR_ERR(ch->thread)); 2187 ch->thread = NULL; 2188 goto err_destroy_qp; 2189 } 2190 2191 out: 2192 kfree(qp_init); 2193 return ret; 2194 2195 err_destroy_qp: 2196 ib_destroy_qp(ch->qp); 2197 err_destroy_cq: 2198 ib_destroy_cq(ch->cq); 2199 goto out; 2200 } 2201 2202 static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch) 2203 { 2204 if (ch->thread) 2205 kthread_stop(ch->thread); 2206 2207 ib_destroy_qp(ch->qp); 2208 ib_destroy_cq(ch->cq); 2209 } 2210 2211 /** 2212 * __srpt_close_ch() - Close an RDMA channel by setting the QP error state. 2213 * 2214 * Reset the QP and make sure all resources associated with the channel will 2215 * be deallocated at an appropriate time. 2216 * 2217 * Note: The caller must hold ch->sport->sdev->spinlock. 2218 */ 2219 static void __srpt_close_ch(struct srpt_rdma_ch *ch) 2220 { 2221 struct srpt_device *sdev; 2222 enum rdma_ch_state prev_state; 2223 unsigned long flags; 2224 2225 sdev = ch->sport->sdev; 2226 2227 spin_lock_irqsave(&ch->spinlock, flags); 2228 prev_state = ch->state; 2229 switch (prev_state) { 2230 case CH_CONNECTING: 2231 case CH_LIVE: 2232 ch->state = CH_DISCONNECTING; 2233 break; 2234 default: 2235 break; 2236 } 2237 spin_unlock_irqrestore(&ch->spinlock, flags); 2238 2239 switch (prev_state) { 2240 case CH_CONNECTING: 2241 ib_send_cm_rej(ch->cm_id, IB_CM_REJ_NO_RESOURCES, NULL, 0, 2242 NULL, 0); 2243 /* fall through */ 2244 case CH_LIVE: 2245 if (ib_send_cm_dreq(ch->cm_id, NULL, 0) < 0) 2246 printk(KERN_ERR "sending CM DREQ failed.\n"); 2247 break; 2248 case CH_DISCONNECTING: 2249 break; 2250 case CH_DRAINING: 2251 case CH_RELEASING: 2252 break; 2253 } 2254 } 2255 2256 /** 2257 * srpt_close_ch() - Close an RDMA channel. 2258 */ 2259 static void srpt_close_ch(struct srpt_rdma_ch *ch) 2260 { 2261 struct srpt_device *sdev; 2262 2263 sdev = ch->sport->sdev; 2264 spin_lock_irq(&sdev->spinlock); 2265 __srpt_close_ch(ch); 2266 spin_unlock_irq(&sdev->spinlock); 2267 } 2268 2269 /** 2270 * srpt_drain_channel() - Drain a channel by resetting the IB queue pair. 2271 * @cm_id: Pointer to the CM ID of the channel to be drained. 2272 * 2273 * Note: Must be called from inside srpt_cm_handler to avoid a race between 2274 * accessing sdev->spinlock and the call to kfree(sdev) in srpt_remove_one() 2275 * (the caller of srpt_cm_handler holds the cm_id spinlock; srpt_remove_one() 2276 * waits until all target sessions for the associated IB device have been 2277 * unregistered and target session registration involves a call to 2278 * ib_destroy_cm_id(), which locks the cm_id spinlock and hence waits until 2279 * this function has finished). 2280 */ 2281 static void srpt_drain_channel(struct ib_cm_id *cm_id) 2282 { 2283 struct srpt_device *sdev; 2284 struct srpt_rdma_ch *ch; 2285 int ret; 2286 bool do_reset = false; 2287 2288 WARN_ON_ONCE(irqs_disabled()); 2289 2290 sdev = cm_id->context; 2291 BUG_ON(!sdev); 2292 spin_lock_irq(&sdev->spinlock); 2293 list_for_each_entry(ch, &sdev->rch_list, list) { 2294 if (ch->cm_id == cm_id) { 2295 do_reset = srpt_test_and_set_ch_state(ch, 2296 CH_CONNECTING, CH_DRAINING) || 2297 srpt_test_and_set_ch_state(ch, 2298 CH_LIVE, CH_DRAINING) || 2299 srpt_test_and_set_ch_state(ch, 2300 CH_DISCONNECTING, CH_DRAINING); 2301 break; 2302 } 2303 } 2304 spin_unlock_irq(&sdev->spinlock); 2305 2306 if (do_reset) { 2307 ret = srpt_ch_qp_err(ch); 2308 if (ret < 0) 2309 printk(KERN_ERR "Setting queue pair in error state" 2310 " failed: %d\n", ret); 2311 } 2312 } 2313 2314 /** 2315 * srpt_find_channel() - Look up an RDMA channel. 2316 * @cm_id: Pointer to the CM ID of the channel to be looked up. 2317 * 2318 * Return NULL if no matching RDMA channel has been found. 2319 */ 2320 static struct srpt_rdma_ch *srpt_find_channel(struct srpt_device *sdev, 2321 struct ib_cm_id *cm_id) 2322 { 2323 struct srpt_rdma_ch *ch; 2324 bool found; 2325 2326 WARN_ON_ONCE(irqs_disabled()); 2327 BUG_ON(!sdev); 2328 2329 found = false; 2330 spin_lock_irq(&sdev->spinlock); 2331 list_for_each_entry(ch, &sdev->rch_list, list) { 2332 if (ch->cm_id == cm_id) { 2333 found = true; 2334 break; 2335 } 2336 } 2337 spin_unlock_irq(&sdev->spinlock); 2338 2339 return found ? ch : NULL; 2340 } 2341 2342 /** 2343 * srpt_release_channel() - Release channel resources. 2344 * 2345 * Schedules the actual release because: 2346 * - Calling the ib_destroy_cm_id() call from inside an IB CM callback would 2347 * trigger a deadlock. 2348 * - It is not safe to call TCM transport_* functions from interrupt context. 2349 */ 2350 static void srpt_release_channel(struct srpt_rdma_ch *ch) 2351 { 2352 schedule_work(&ch->release_work); 2353 } 2354 2355 static void srpt_release_channel_work(struct work_struct *w) 2356 { 2357 struct srpt_rdma_ch *ch; 2358 struct srpt_device *sdev; 2359 2360 ch = container_of(w, struct srpt_rdma_ch, release_work); 2361 pr_debug("ch = %p; ch->sess = %p; release_done = %p\n", ch, ch->sess, 2362 ch->release_done); 2363 2364 sdev = ch->sport->sdev; 2365 BUG_ON(!sdev); 2366 2367 transport_deregister_session_configfs(ch->sess); 2368 transport_deregister_session(ch->sess); 2369 ch->sess = NULL; 2370 2371 srpt_destroy_ch_ib(ch); 2372 2373 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring, 2374 ch->sport->sdev, ch->rq_size, 2375 ch->rsp_size, DMA_TO_DEVICE); 2376 2377 spin_lock_irq(&sdev->spinlock); 2378 list_del(&ch->list); 2379 spin_unlock_irq(&sdev->spinlock); 2380 2381 ib_destroy_cm_id(ch->cm_id); 2382 2383 if (ch->release_done) 2384 complete(ch->release_done); 2385 2386 wake_up(&sdev->ch_releaseQ); 2387 2388 kfree(ch); 2389 } 2390 2391 static struct srpt_node_acl *__srpt_lookup_acl(struct srpt_port *sport, 2392 u8 i_port_id[16]) 2393 { 2394 struct srpt_node_acl *nacl; 2395 2396 list_for_each_entry(nacl, &sport->port_acl_list, list) 2397 if (memcmp(nacl->i_port_id, i_port_id, 2398 sizeof(nacl->i_port_id)) == 0) 2399 return nacl; 2400 2401 return NULL; 2402 } 2403 2404 static struct srpt_node_acl *srpt_lookup_acl(struct srpt_port *sport, 2405 u8 i_port_id[16]) 2406 { 2407 struct srpt_node_acl *nacl; 2408 2409 spin_lock_irq(&sport->port_acl_lock); 2410 nacl = __srpt_lookup_acl(sport, i_port_id); 2411 spin_unlock_irq(&sport->port_acl_lock); 2412 2413 return nacl; 2414 } 2415 2416 /** 2417 * srpt_cm_req_recv() - Process the event IB_CM_REQ_RECEIVED. 2418 * 2419 * Ownership of the cm_id is transferred to the target session if this 2420 * functions returns zero. Otherwise the caller remains the owner of cm_id. 2421 */ 2422 static int srpt_cm_req_recv(struct ib_cm_id *cm_id, 2423 struct ib_cm_req_event_param *param, 2424 void *private_data) 2425 { 2426 struct srpt_device *sdev = cm_id->context; 2427 struct srpt_port *sport = &sdev->port[param->port - 1]; 2428 struct srp_login_req *req; 2429 struct srp_login_rsp *rsp; 2430 struct srp_login_rej *rej; 2431 struct ib_cm_rep_param *rep_param; 2432 struct srpt_rdma_ch *ch, *tmp_ch; 2433 struct srpt_node_acl *nacl; 2434 u32 it_iu_len; 2435 int i; 2436 int ret = 0; 2437 2438 WARN_ON_ONCE(irqs_disabled()); 2439 2440 if (WARN_ON(!sdev || !private_data)) 2441 return -EINVAL; 2442 2443 req = (struct srp_login_req *)private_data; 2444 2445 it_iu_len = be32_to_cpu(req->req_it_iu_len); 2446 2447 printk(KERN_INFO "Received SRP_LOGIN_REQ with i_port_id 0x%llx:0x%llx," 2448 " t_port_id 0x%llx:0x%llx and it_iu_len %d on port %d" 2449 " (guid=0x%llx:0x%llx)\n", 2450 be64_to_cpu(*(__be64 *)&req->initiator_port_id[0]), 2451 be64_to_cpu(*(__be64 *)&req->initiator_port_id[8]), 2452 be64_to_cpu(*(__be64 *)&req->target_port_id[0]), 2453 be64_to_cpu(*(__be64 *)&req->target_port_id[8]), 2454 it_iu_len, 2455 param->port, 2456 be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[0]), 2457 be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[8])); 2458 2459 rsp = kzalloc(sizeof *rsp, GFP_KERNEL); 2460 rej = kzalloc(sizeof *rej, GFP_KERNEL); 2461 rep_param = kzalloc(sizeof *rep_param, GFP_KERNEL); 2462 2463 if (!rsp || !rej || !rep_param) { 2464 ret = -ENOMEM; 2465 goto out; 2466 } 2467 2468 if (it_iu_len > srp_max_req_size || it_iu_len < 64) { 2469 rej->reason = __constant_cpu_to_be32( 2470 SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE); 2471 ret = -EINVAL; 2472 printk(KERN_ERR "rejected SRP_LOGIN_REQ because its" 2473 " length (%d bytes) is out of range (%d .. %d)\n", 2474 it_iu_len, 64, srp_max_req_size); 2475 goto reject; 2476 } 2477 2478 if (!sport->enabled) { 2479 rej->reason = __constant_cpu_to_be32( 2480 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); 2481 ret = -EINVAL; 2482 printk(KERN_ERR "rejected SRP_LOGIN_REQ because the target port" 2483 " has not yet been enabled\n"); 2484 goto reject; 2485 } 2486 2487 if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) { 2488 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_NO_CHAN; 2489 2490 spin_lock_irq(&sdev->spinlock); 2491 2492 list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list) { 2493 if (!memcmp(ch->i_port_id, req->initiator_port_id, 16) 2494 && !memcmp(ch->t_port_id, req->target_port_id, 16) 2495 && param->port == ch->sport->port 2496 && param->listen_id == ch->sport->sdev->cm_id 2497 && ch->cm_id) { 2498 enum rdma_ch_state ch_state; 2499 2500 ch_state = srpt_get_ch_state(ch); 2501 if (ch_state != CH_CONNECTING 2502 && ch_state != CH_LIVE) 2503 continue; 2504 2505 /* found an existing channel */ 2506 pr_debug("Found existing channel %s" 2507 " cm_id= %p state= %d\n", 2508 ch->sess_name, ch->cm_id, ch_state); 2509 2510 __srpt_close_ch(ch); 2511 2512 rsp->rsp_flags = 2513 SRP_LOGIN_RSP_MULTICHAN_TERMINATED; 2514 } 2515 } 2516 2517 spin_unlock_irq(&sdev->spinlock); 2518 2519 } else 2520 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_MAINTAINED; 2521 2522 if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid) 2523 || *(__be64 *)(req->target_port_id + 8) != 2524 cpu_to_be64(srpt_service_guid)) { 2525 rej->reason = __constant_cpu_to_be32( 2526 SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL); 2527 ret = -ENOMEM; 2528 printk(KERN_ERR "rejected SRP_LOGIN_REQ because it" 2529 " has an invalid target port identifier.\n"); 2530 goto reject; 2531 } 2532 2533 ch = kzalloc(sizeof *ch, GFP_KERNEL); 2534 if (!ch) { 2535 rej->reason = __constant_cpu_to_be32( 2536 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); 2537 printk(KERN_ERR "rejected SRP_LOGIN_REQ because no memory.\n"); 2538 ret = -ENOMEM; 2539 goto reject; 2540 } 2541 2542 INIT_WORK(&ch->release_work, srpt_release_channel_work); 2543 memcpy(ch->i_port_id, req->initiator_port_id, 16); 2544 memcpy(ch->t_port_id, req->target_port_id, 16); 2545 ch->sport = &sdev->port[param->port - 1]; 2546 ch->cm_id = cm_id; 2547 /* 2548 * Avoid QUEUE_FULL conditions by limiting the number of buffers used 2549 * for the SRP protocol to the command queue size. 2550 */ 2551 ch->rq_size = SRPT_RQ_SIZE; 2552 spin_lock_init(&ch->spinlock); 2553 ch->state = CH_CONNECTING; 2554 INIT_LIST_HEAD(&ch->cmd_wait_list); 2555 ch->rsp_size = ch->sport->port_attrib.srp_max_rsp_size; 2556 2557 ch->ioctx_ring = (struct srpt_send_ioctx **) 2558 srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size, 2559 sizeof(*ch->ioctx_ring[0]), 2560 ch->rsp_size, DMA_TO_DEVICE); 2561 if (!ch->ioctx_ring) 2562 goto free_ch; 2563 2564 INIT_LIST_HEAD(&ch->free_list); 2565 for (i = 0; i < ch->rq_size; i++) { 2566 ch->ioctx_ring[i]->ch = ch; 2567 list_add_tail(&ch->ioctx_ring[i]->free_list, &ch->free_list); 2568 } 2569 2570 ret = srpt_create_ch_ib(ch); 2571 if (ret) { 2572 rej->reason = __constant_cpu_to_be32( 2573 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); 2574 printk(KERN_ERR "rejected SRP_LOGIN_REQ because creating" 2575 " a new RDMA channel failed.\n"); 2576 goto free_ring; 2577 } 2578 2579 ret = srpt_ch_qp_rtr(ch, ch->qp); 2580 if (ret) { 2581 rej->reason = __constant_cpu_to_be32( 2582 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); 2583 printk(KERN_ERR "rejected SRP_LOGIN_REQ because enabling" 2584 " RTR failed (error code = %d)\n", ret); 2585 goto destroy_ib; 2586 } 2587 /* 2588 * Use the initator port identifier as the session name. 2589 */ 2590 snprintf(ch->sess_name, sizeof(ch->sess_name), "0x%016llx%016llx", 2591 be64_to_cpu(*(__be64 *)ch->i_port_id), 2592 be64_to_cpu(*(__be64 *)(ch->i_port_id + 8))); 2593 2594 pr_debug("registering session %s\n", ch->sess_name); 2595 2596 nacl = srpt_lookup_acl(sport, ch->i_port_id); 2597 if (!nacl) { 2598 printk(KERN_INFO "Rejected login because no ACL has been" 2599 " configured yet for initiator %s.\n", ch->sess_name); 2600 rej->reason = __constant_cpu_to_be32( 2601 SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED); 2602 goto destroy_ib; 2603 } 2604 2605 ch->sess = transport_init_session(); 2606 if (IS_ERR(ch->sess)) { 2607 rej->reason = __constant_cpu_to_be32( 2608 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); 2609 pr_debug("Failed to create session\n"); 2610 goto deregister_session; 2611 } 2612 ch->sess->se_node_acl = &nacl->nacl; 2613 transport_register_session(&sport->port_tpg_1, &nacl->nacl, ch->sess, ch); 2614 2615 pr_debug("Establish connection sess=%p name=%s cm_id=%p\n", ch->sess, 2616 ch->sess_name, ch->cm_id); 2617 2618 /* create srp_login_response */ 2619 rsp->opcode = SRP_LOGIN_RSP; 2620 rsp->tag = req->tag; 2621 rsp->max_it_iu_len = req->req_it_iu_len; 2622 rsp->max_ti_iu_len = req->req_it_iu_len; 2623 ch->max_ti_iu_len = it_iu_len; 2624 rsp->buf_fmt = __constant_cpu_to_be16(SRP_BUF_FORMAT_DIRECT 2625 | SRP_BUF_FORMAT_INDIRECT); 2626 rsp->req_lim_delta = cpu_to_be32(ch->rq_size); 2627 atomic_set(&ch->req_lim, ch->rq_size); 2628 atomic_set(&ch->req_lim_delta, 0); 2629 2630 /* create cm reply */ 2631 rep_param->qp_num = ch->qp->qp_num; 2632 rep_param->private_data = (void *)rsp; 2633 rep_param->private_data_len = sizeof *rsp; 2634 rep_param->rnr_retry_count = 7; 2635 rep_param->flow_control = 1; 2636 rep_param->failover_accepted = 0; 2637 rep_param->srq = 1; 2638 rep_param->responder_resources = 4; 2639 rep_param->initiator_depth = 4; 2640 2641 ret = ib_send_cm_rep(cm_id, rep_param); 2642 if (ret) { 2643 printk(KERN_ERR "sending SRP_LOGIN_REQ response failed" 2644 " (error code = %d)\n", ret); 2645 goto release_channel; 2646 } 2647 2648 spin_lock_irq(&sdev->spinlock); 2649 list_add_tail(&ch->list, &sdev->rch_list); 2650 spin_unlock_irq(&sdev->spinlock); 2651 2652 goto out; 2653 2654 release_channel: 2655 srpt_set_ch_state(ch, CH_RELEASING); 2656 transport_deregister_session_configfs(ch->sess); 2657 2658 deregister_session: 2659 transport_deregister_session(ch->sess); 2660 ch->sess = NULL; 2661 2662 destroy_ib: 2663 srpt_destroy_ch_ib(ch); 2664 2665 free_ring: 2666 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring, 2667 ch->sport->sdev, ch->rq_size, 2668 ch->rsp_size, DMA_TO_DEVICE); 2669 free_ch: 2670 kfree(ch); 2671 2672 reject: 2673 rej->opcode = SRP_LOGIN_REJ; 2674 rej->tag = req->tag; 2675 rej->buf_fmt = __constant_cpu_to_be16(SRP_BUF_FORMAT_DIRECT 2676 | SRP_BUF_FORMAT_INDIRECT); 2677 2678 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0, 2679 (void *)rej, sizeof *rej); 2680 2681 out: 2682 kfree(rep_param); 2683 kfree(rsp); 2684 kfree(rej); 2685 2686 return ret; 2687 } 2688 2689 static void srpt_cm_rej_recv(struct ib_cm_id *cm_id) 2690 { 2691 printk(KERN_INFO "Received IB REJ for cm_id %p.\n", cm_id); 2692 srpt_drain_channel(cm_id); 2693 } 2694 2695 /** 2696 * srpt_cm_rtu_recv() - Process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event. 2697 * 2698 * An IB_CM_RTU_RECEIVED message indicates that the connection is established 2699 * and that the recipient may begin transmitting (RTU = ready to use). 2700 */ 2701 static void srpt_cm_rtu_recv(struct ib_cm_id *cm_id) 2702 { 2703 struct srpt_rdma_ch *ch; 2704 int ret; 2705 2706 ch = srpt_find_channel(cm_id->context, cm_id); 2707 BUG_ON(!ch); 2708 2709 if (srpt_test_and_set_ch_state(ch, CH_CONNECTING, CH_LIVE)) { 2710 struct srpt_recv_ioctx *ioctx, *ioctx_tmp; 2711 2712 ret = srpt_ch_qp_rts(ch, ch->qp); 2713 2714 list_for_each_entry_safe(ioctx, ioctx_tmp, &ch->cmd_wait_list, 2715 wait_list) { 2716 list_del(&ioctx->wait_list); 2717 srpt_handle_new_iu(ch, ioctx, NULL); 2718 } 2719 if (ret) 2720 srpt_close_ch(ch); 2721 } 2722 } 2723 2724 static void srpt_cm_timewait_exit(struct ib_cm_id *cm_id) 2725 { 2726 printk(KERN_INFO "Received IB TimeWait exit for cm_id %p.\n", cm_id); 2727 srpt_drain_channel(cm_id); 2728 } 2729 2730 static void srpt_cm_rep_error(struct ib_cm_id *cm_id) 2731 { 2732 printk(KERN_INFO "Received IB REP error for cm_id %p.\n", cm_id); 2733 srpt_drain_channel(cm_id); 2734 } 2735 2736 /** 2737 * srpt_cm_dreq_recv() - Process reception of a DREQ message. 2738 */ 2739 static void srpt_cm_dreq_recv(struct ib_cm_id *cm_id) 2740 { 2741 struct srpt_rdma_ch *ch; 2742 unsigned long flags; 2743 bool send_drep = false; 2744 2745 ch = srpt_find_channel(cm_id->context, cm_id); 2746 BUG_ON(!ch); 2747 2748 pr_debug("cm_id= %p ch->state= %d\n", cm_id, srpt_get_ch_state(ch)); 2749 2750 spin_lock_irqsave(&ch->spinlock, flags); 2751 switch (ch->state) { 2752 case CH_CONNECTING: 2753 case CH_LIVE: 2754 send_drep = true; 2755 ch->state = CH_DISCONNECTING; 2756 break; 2757 case CH_DISCONNECTING: 2758 case CH_DRAINING: 2759 case CH_RELEASING: 2760 WARN(true, "unexpected channel state %d\n", ch->state); 2761 break; 2762 } 2763 spin_unlock_irqrestore(&ch->spinlock, flags); 2764 2765 if (send_drep) { 2766 if (ib_send_cm_drep(ch->cm_id, NULL, 0) < 0) 2767 printk(KERN_ERR "Sending IB DREP failed.\n"); 2768 printk(KERN_INFO "Received DREQ and sent DREP for session %s.\n", 2769 ch->sess_name); 2770 } 2771 } 2772 2773 /** 2774 * srpt_cm_drep_recv() - Process reception of a DREP message. 2775 */ 2776 static void srpt_cm_drep_recv(struct ib_cm_id *cm_id) 2777 { 2778 printk(KERN_INFO "Received InfiniBand DREP message for cm_id %p.\n", 2779 cm_id); 2780 srpt_drain_channel(cm_id); 2781 } 2782 2783 /** 2784 * srpt_cm_handler() - IB connection manager callback function. 2785 * 2786 * A non-zero return value will cause the caller destroy the CM ID. 2787 * 2788 * Note: srpt_cm_handler() must only return a non-zero value when transferring 2789 * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning 2790 * a non-zero value in any other case will trigger a race with the 2791 * ib_destroy_cm_id() call in srpt_release_channel(). 2792 */ 2793 static int srpt_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 2794 { 2795 int ret; 2796 2797 ret = 0; 2798 switch (event->event) { 2799 case IB_CM_REQ_RECEIVED: 2800 ret = srpt_cm_req_recv(cm_id, &event->param.req_rcvd, 2801 event->private_data); 2802 break; 2803 case IB_CM_REJ_RECEIVED: 2804 srpt_cm_rej_recv(cm_id); 2805 break; 2806 case IB_CM_RTU_RECEIVED: 2807 case IB_CM_USER_ESTABLISHED: 2808 srpt_cm_rtu_recv(cm_id); 2809 break; 2810 case IB_CM_DREQ_RECEIVED: 2811 srpt_cm_dreq_recv(cm_id); 2812 break; 2813 case IB_CM_DREP_RECEIVED: 2814 srpt_cm_drep_recv(cm_id); 2815 break; 2816 case IB_CM_TIMEWAIT_EXIT: 2817 srpt_cm_timewait_exit(cm_id); 2818 break; 2819 case IB_CM_REP_ERROR: 2820 srpt_cm_rep_error(cm_id); 2821 break; 2822 case IB_CM_DREQ_ERROR: 2823 printk(KERN_INFO "Received IB DREQ ERROR event.\n"); 2824 break; 2825 case IB_CM_MRA_RECEIVED: 2826 printk(KERN_INFO "Received IB MRA event\n"); 2827 break; 2828 default: 2829 printk(KERN_ERR "received unrecognized IB CM event %d\n", 2830 event->event); 2831 break; 2832 } 2833 2834 return ret; 2835 } 2836 2837 /** 2838 * srpt_perform_rdmas() - Perform IB RDMA. 2839 * 2840 * Returns zero upon success or a negative number upon failure. 2841 */ 2842 static int srpt_perform_rdmas(struct srpt_rdma_ch *ch, 2843 struct srpt_send_ioctx *ioctx) 2844 { 2845 struct ib_send_wr wr; 2846 struct ib_send_wr *bad_wr; 2847 struct rdma_iu *riu; 2848 int i; 2849 int ret; 2850 int sq_wr_avail; 2851 enum dma_data_direction dir; 2852 const int n_rdma = ioctx->n_rdma; 2853 2854 dir = ioctx->cmd.data_direction; 2855 if (dir == DMA_TO_DEVICE) { 2856 /* write */ 2857 ret = -ENOMEM; 2858 sq_wr_avail = atomic_sub_return(n_rdma, &ch->sq_wr_avail); 2859 if (sq_wr_avail < 0) { 2860 printk(KERN_WARNING "IB send queue full (needed %d)\n", 2861 n_rdma); 2862 goto out; 2863 } 2864 } 2865 2866 ioctx->rdma_aborted = false; 2867 ret = 0; 2868 riu = ioctx->rdma_ius; 2869 memset(&wr, 0, sizeof wr); 2870 2871 for (i = 0; i < n_rdma; ++i, ++riu) { 2872 if (dir == DMA_FROM_DEVICE) { 2873 wr.opcode = IB_WR_RDMA_WRITE; 2874 wr.wr_id = encode_wr_id(i == n_rdma - 1 ? 2875 SRPT_RDMA_WRITE_LAST : 2876 SRPT_RDMA_MID, 2877 ioctx->ioctx.index); 2878 } else { 2879 wr.opcode = IB_WR_RDMA_READ; 2880 wr.wr_id = encode_wr_id(i == n_rdma - 1 ? 2881 SRPT_RDMA_READ_LAST : 2882 SRPT_RDMA_MID, 2883 ioctx->ioctx.index); 2884 } 2885 wr.next = NULL; 2886 wr.wr.rdma.remote_addr = riu->raddr; 2887 wr.wr.rdma.rkey = riu->rkey; 2888 wr.num_sge = riu->sge_cnt; 2889 wr.sg_list = riu->sge; 2890 2891 /* only get completion event for the last rdma write */ 2892 if (i == (n_rdma - 1) && dir == DMA_TO_DEVICE) 2893 wr.send_flags = IB_SEND_SIGNALED; 2894 2895 ret = ib_post_send(ch->qp, &wr, &bad_wr); 2896 if (ret) 2897 break; 2898 } 2899 2900 if (ret) 2901 printk(KERN_ERR "%s[%d]: ib_post_send() returned %d for %d/%d", 2902 __func__, __LINE__, ret, i, n_rdma); 2903 if (ret && i > 0) { 2904 wr.num_sge = 0; 2905 wr.wr_id = encode_wr_id(SRPT_RDMA_ABORT, ioctx->ioctx.index); 2906 wr.send_flags = IB_SEND_SIGNALED; 2907 while (ch->state == CH_LIVE && 2908 ib_post_send(ch->qp, &wr, &bad_wr) != 0) { 2909 printk(KERN_INFO "Trying to abort failed RDMA transfer [%d]", 2910 ioctx->ioctx.index); 2911 msleep(1000); 2912 } 2913 while (ch->state != CH_RELEASING && !ioctx->rdma_aborted) { 2914 printk(KERN_INFO "Waiting until RDMA abort finished [%d]", 2915 ioctx->ioctx.index); 2916 msleep(1000); 2917 } 2918 } 2919 out: 2920 if (unlikely(dir == DMA_TO_DEVICE && ret < 0)) 2921 atomic_add(n_rdma, &ch->sq_wr_avail); 2922 return ret; 2923 } 2924 2925 /** 2926 * srpt_xfer_data() - Start data transfer from initiator to target. 2927 */ 2928 static int srpt_xfer_data(struct srpt_rdma_ch *ch, 2929 struct srpt_send_ioctx *ioctx) 2930 { 2931 int ret; 2932 2933 ret = srpt_map_sg_to_ib_sge(ch, ioctx); 2934 if (ret) { 2935 printk(KERN_ERR "%s[%d] ret=%d\n", __func__, __LINE__, ret); 2936 goto out; 2937 } 2938 2939 ret = srpt_perform_rdmas(ch, ioctx); 2940 if (ret) { 2941 if (ret == -EAGAIN || ret == -ENOMEM) 2942 printk(KERN_INFO "%s[%d] queue full -- ret=%d\n", 2943 __func__, __LINE__, ret); 2944 else 2945 printk(KERN_ERR "%s[%d] fatal error -- ret=%d\n", 2946 __func__, __LINE__, ret); 2947 goto out_unmap; 2948 } 2949 2950 out: 2951 return ret; 2952 out_unmap: 2953 srpt_unmap_sg_to_ib_sge(ch, ioctx); 2954 goto out; 2955 } 2956 2957 static int srpt_write_pending_status(struct se_cmd *se_cmd) 2958 { 2959 struct srpt_send_ioctx *ioctx; 2960 2961 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd); 2962 return srpt_get_cmd_state(ioctx) == SRPT_STATE_NEED_DATA; 2963 } 2964 2965 /* 2966 * srpt_write_pending() - Start data transfer from initiator to target (write). 2967 */ 2968 static int srpt_write_pending(struct se_cmd *se_cmd) 2969 { 2970 struct srpt_rdma_ch *ch; 2971 struct srpt_send_ioctx *ioctx; 2972 enum srpt_command_state new_state; 2973 enum rdma_ch_state ch_state; 2974 int ret; 2975 2976 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd); 2977 2978 new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA); 2979 WARN_ON(new_state == SRPT_STATE_DONE); 2980 2981 ch = ioctx->ch; 2982 BUG_ON(!ch); 2983 2984 ch_state = srpt_get_ch_state(ch); 2985 switch (ch_state) { 2986 case CH_CONNECTING: 2987 WARN(true, "unexpected channel state %d\n", ch_state); 2988 ret = -EINVAL; 2989 goto out; 2990 case CH_LIVE: 2991 break; 2992 case CH_DISCONNECTING: 2993 case CH_DRAINING: 2994 case CH_RELEASING: 2995 pr_debug("cmd with tag %lld: channel disconnecting\n", 2996 ioctx->tag); 2997 srpt_set_cmd_state(ioctx, SRPT_STATE_DATA_IN); 2998 ret = -EINVAL; 2999 goto out; 3000 } 3001 ret = srpt_xfer_data(ch, ioctx); 3002 3003 out: 3004 return ret; 3005 } 3006 3007 static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status) 3008 { 3009 switch (tcm_mgmt_status) { 3010 case TMR_FUNCTION_COMPLETE: 3011 return SRP_TSK_MGMT_SUCCESS; 3012 case TMR_FUNCTION_REJECTED: 3013 return SRP_TSK_MGMT_FUNC_NOT_SUPP; 3014 } 3015 return SRP_TSK_MGMT_FAILED; 3016 } 3017 3018 /** 3019 * srpt_queue_response() - Transmits the response to a SCSI command. 3020 * 3021 * Callback function called by the TCM core. Must not block since it can be 3022 * invoked on the context of the IB completion handler. 3023 */ 3024 static int srpt_queue_response(struct se_cmd *cmd) 3025 { 3026 struct srpt_rdma_ch *ch; 3027 struct srpt_send_ioctx *ioctx; 3028 enum srpt_command_state state; 3029 unsigned long flags; 3030 int ret; 3031 enum dma_data_direction dir; 3032 int resp_len; 3033 u8 srp_tm_status; 3034 3035 ret = 0; 3036 3037 ioctx = container_of(cmd, struct srpt_send_ioctx, cmd); 3038 ch = ioctx->ch; 3039 BUG_ON(!ch); 3040 3041 spin_lock_irqsave(&ioctx->spinlock, flags); 3042 state = ioctx->state; 3043 switch (state) { 3044 case SRPT_STATE_NEW: 3045 case SRPT_STATE_DATA_IN: 3046 ioctx->state = SRPT_STATE_CMD_RSP_SENT; 3047 break; 3048 case SRPT_STATE_MGMT: 3049 ioctx->state = SRPT_STATE_MGMT_RSP_SENT; 3050 break; 3051 default: 3052 WARN(true, "ch %p; cmd %d: unexpected command state %d\n", 3053 ch, ioctx->ioctx.index, ioctx->state); 3054 break; 3055 } 3056 spin_unlock_irqrestore(&ioctx->spinlock, flags); 3057 3058 if (unlikely(transport_check_aborted_status(&ioctx->cmd, false) 3059 || WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT))) { 3060 atomic_inc(&ch->req_lim_delta); 3061 srpt_abort_cmd(ioctx); 3062 goto out; 3063 } 3064 3065 dir = ioctx->cmd.data_direction; 3066 3067 /* For read commands, transfer the data to the initiator. */ 3068 if (dir == DMA_FROM_DEVICE && ioctx->cmd.data_length && 3069 !ioctx->queue_status_only) { 3070 ret = srpt_xfer_data(ch, ioctx); 3071 if (ret) { 3072 printk(KERN_ERR "xfer_data failed for tag %llu\n", 3073 ioctx->tag); 3074 goto out; 3075 } 3076 } 3077 3078 if (state != SRPT_STATE_MGMT) 3079 resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->tag, 3080 cmd->scsi_status); 3081 else { 3082 srp_tm_status 3083 = tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response); 3084 resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status, 3085 ioctx->tag); 3086 } 3087 ret = srpt_post_send(ch, ioctx, resp_len); 3088 if (ret) { 3089 printk(KERN_ERR "sending cmd response failed for tag %llu\n", 3090 ioctx->tag); 3091 srpt_unmap_sg_to_ib_sge(ch, ioctx); 3092 srpt_set_cmd_state(ioctx, SRPT_STATE_DONE); 3093 kref_put(&ioctx->kref, srpt_put_send_ioctx_kref); 3094 } 3095 3096 out: 3097 return ret; 3098 } 3099 3100 static int srpt_queue_status(struct se_cmd *cmd) 3101 { 3102 struct srpt_send_ioctx *ioctx; 3103 3104 ioctx = container_of(cmd, struct srpt_send_ioctx, cmd); 3105 BUG_ON(ioctx->sense_data != cmd->sense_buffer); 3106 if (cmd->se_cmd_flags & 3107 (SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE)) 3108 WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION); 3109 ioctx->queue_status_only = true; 3110 return srpt_queue_response(cmd); 3111 } 3112 3113 static void srpt_refresh_port_work(struct work_struct *work) 3114 { 3115 struct srpt_port *sport = container_of(work, struct srpt_port, work); 3116 3117 srpt_refresh_port(sport); 3118 } 3119 3120 static int srpt_ch_list_empty(struct srpt_device *sdev) 3121 { 3122 int res; 3123 3124 spin_lock_irq(&sdev->spinlock); 3125 res = list_empty(&sdev->rch_list); 3126 spin_unlock_irq(&sdev->spinlock); 3127 3128 return res; 3129 } 3130 3131 /** 3132 * srpt_release_sdev() - Free the channel resources associated with a target. 3133 */ 3134 static int srpt_release_sdev(struct srpt_device *sdev) 3135 { 3136 struct srpt_rdma_ch *ch, *tmp_ch; 3137 int res; 3138 3139 WARN_ON_ONCE(irqs_disabled()); 3140 3141 BUG_ON(!sdev); 3142 3143 spin_lock_irq(&sdev->spinlock); 3144 list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list) 3145 __srpt_close_ch(ch); 3146 spin_unlock_irq(&sdev->spinlock); 3147 3148 res = wait_event_interruptible(sdev->ch_releaseQ, 3149 srpt_ch_list_empty(sdev)); 3150 if (res) 3151 printk(KERN_ERR "%s: interrupted.\n", __func__); 3152 3153 return 0; 3154 } 3155 3156 static struct srpt_port *__srpt_lookup_port(const char *name) 3157 { 3158 struct ib_device *dev; 3159 struct srpt_device *sdev; 3160 struct srpt_port *sport; 3161 int i; 3162 3163 list_for_each_entry(sdev, &srpt_dev_list, list) { 3164 dev = sdev->device; 3165 if (!dev) 3166 continue; 3167 3168 for (i = 0; i < dev->phys_port_cnt; i++) { 3169 sport = &sdev->port[i]; 3170 3171 if (!strcmp(sport->port_guid, name)) 3172 return sport; 3173 } 3174 } 3175 3176 return NULL; 3177 } 3178 3179 static struct srpt_port *srpt_lookup_port(const char *name) 3180 { 3181 struct srpt_port *sport; 3182 3183 spin_lock(&srpt_dev_lock); 3184 sport = __srpt_lookup_port(name); 3185 spin_unlock(&srpt_dev_lock); 3186 3187 return sport; 3188 } 3189 3190 /** 3191 * srpt_add_one() - Infiniband device addition callback function. 3192 */ 3193 static void srpt_add_one(struct ib_device *device) 3194 { 3195 struct srpt_device *sdev; 3196 struct srpt_port *sport; 3197 struct ib_srq_init_attr srq_attr; 3198 int i; 3199 3200 pr_debug("device = %p, device->dma_ops = %p\n", device, 3201 device->dma_ops); 3202 3203 sdev = kzalloc(sizeof *sdev, GFP_KERNEL); 3204 if (!sdev) 3205 goto err; 3206 3207 sdev->device = device; 3208 INIT_LIST_HEAD(&sdev->rch_list); 3209 init_waitqueue_head(&sdev->ch_releaseQ); 3210 spin_lock_init(&sdev->spinlock); 3211 3212 if (ib_query_device(device, &sdev->dev_attr)) 3213 goto free_dev; 3214 3215 sdev->pd = ib_alloc_pd(device); 3216 if (IS_ERR(sdev->pd)) 3217 goto free_dev; 3218 3219 sdev->mr = ib_get_dma_mr(sdev->pd, IB_ACCESS_LOCAL_WRITE); 3220 if (IS_ERR(sdev->mr)) 3221 goto err_pd; 3222 3223 sdev->srq_size = min(srpt_srq_size, sdev->dev_attr.max_srq_wr); 3224 3225 srq_attr.event_handler = srpt_srq_event; 3226 srq_attr.srq_context = (void *)sdev; 3227 srq_attr.attr.max_wr = sdev->srq_size; 3228 srq_attr.attr.max_sge = 1; 3229 srq_attr.attr.srq_limit = 0; 3230 3231 sdev->srq = ib_create_srq(sdev->pd, &srq_attr); 3232 if (IS_ERR(sdev->srq)) 3233 goto err_mr; 3234 3235 pr_debug("%s: create SRQ #wr= %d max_allow=%d dev= %s\n", 3236 __func__, sdev->srq_size, sdev->dev_attr.max_srq_wr, 3237 device->name); 3238 3239 if (!srpt_service_guid) 3240 srpt_service_guid = be64_to_cpu(device->node_guid); 3241 3242 sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev); 3243 if (IS_ERR(sdev->cm_id)) 3244 goto err_srq; 3245 3246 /* print out target login information */ 3247 pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx," 3248 "pkey=ffff,service_id=%016llx\n", srpt_service_guid, 3249 srpt_service_guid, srpt_service_guid); 3250 3251 /* 3252 * We do not have a consistent service_id (ie. also id_ext of target_id) 3253 * to identify this target. We currently use the guid of the first HCA 3254 * in the system as service_id; therefore, the target_id will change 3255 * if this HCA is gone bad and replaced by different HCA 3256 */ 3257 if (ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0, NULL)) 3258 goto err_cm; 3259 3260 INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device, 3261 srpt_event_handler); 3262 if (ib_register_event_handler(&sdev->event_handler)) 3263 goto err_cm; 3264 3265 sdev->ioctx_ring = (struct srpt_recv_ioctx **) 3266 srpt_alloc_ioctx_ring(sdev, sdev->srq_size, 3267 sizeof(*sdev->ioctx_ring[0]), 3268 srp_max_req_size, DMA_FROM_DEVICE); 3269 if (!sdev->ioctx_ring) 3270 goto err_event; 3271 3272 for (i = 0; i < sdev->srq_size; ++i) 3273 srpt_post_recv(sdev, sdev->ioctx_ring[i]); 3274 3275 WARN_ON(sdev->device->phys_port_cnt > ARRAY_SIZE(sdev->port)); 3276 3277 for (i = 1; i <= sdev->device->phys_port_cnt; i++) { 3278 sport = &sdev->port[i - 1]; 3279 sport->sdev = sdev; 3280 sport->port = i; 3281 sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE; 3282 sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE; 3283 sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE; 3284 INIT_WORK(&sport->work, srpt_refresh_port_work); 3285 INIT_LIST_HEAD(&sport->port_acl_list); 3286 spin_lock_init(&sport->port_acl_lock); 3287 3288 if (srpt_refresh_port(sport)) { 3289 printk(KERN_ERR "MAD registration failed for %s-%d.\n", 3290 srpt_sdev_name(sdev), i); 3291 goto err_ring; 3292 } 3293 snprintf(sport->port_guid, sizeof(sport->port_guid), 3294 "0x%016llx%016llx", 3295 be64_to_cpu(sport->gid.global.subnet_prefix), 3296 be64_to_cpu(sport->gid.global.interface_id)); 3297 } 3298 3299 spin_lock(&srpt_dev_lock); 3300 list_add_tail(&sdev->list, &srpt_dev_list); 3301 spin_unlock(&srpt_dev_lock); 3302 3303 out: 3304 ib_set_client_data(device, &srpt_client, sdev); 3305 pr_debug("added %s.\n", device->name); 3306 return; 3307 3308 err_ring: 3309 srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev, 3310 sdev->srq_size, srp_max_req_size, 3311 DMA_FROM_DEVICE); 3312 err_event: 3313 ib_unregister_event_handler(&sdev->event_handler); 3314 err_cm: 3315 ib_destroy_cm_id(sdev->cm_id); 3316 err_srq: 3317 ib_destroy_srq(sdev->srq); 3318 err_mr: 3319 ib_dereg_mr(sdev->mr); 3320 err_pd: 3321 ib_dealloc_pd(sdev->pd); 3322 free_dev: 3323 kfree(sdev); 3324 err: 3325 sdev = NULL; 3326 printk(KERN_INFO "%s(%s) failed.\n", __func__, device->name); 3327 goto out; 3328 } 3329 3330 /** 3331 * srpt_remove_one() - InfiniBand device removal callback function. 3332 */ 3333 static void srpt_remove_one(struct ib_device *device) 3334 { 3335 struct srpt_device *sdev; 3336 int i; 3337 3338 sdev = ib_get_client_data(device, &srpt_client); 3339 if (!sdev) { 3340 printk(KERN_INFO "%s(%s): nothing to do.\n", __func__, 3341 device->name); 3342 return; 3343 } 3344 3345 srpt_unregister_mad_agent(sdev); 3346 3347 ib_unregister_event_handler(&sdev->event_handler); 3348 3349 /* Cancel any work queued by the just unregistered IB event handler. */ 3350 for (i = 0; i < sdev->device->phys_port_cnt; i++) 3351 cancel_work_sync(&sdev->port[i].work); 3352 3353 ib_destroy_cm_id(sdev->cm_id); 3354 3355 /* 3356 * Unregistering a target must happen after destroying sdev->cm_id 3357 * such that no new SRP_LOGIN_REQ information units can arrive while 3358 * destroying the target. 3359 */ 3360 spin_lock(&srpt_dev_lock); 3361 list_del(&sdev->list); 3362 spin_unlock(&srpt_dev_lock); 3363 srpt_release_sdev(sdev); 3364 3365 ib_destroy_srq(sdev->srq); 3366 ib_dereg_mr(sdev->mr); 3367 ib_dealloc_pd(sdev->pd); 3368 3369 srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev, 3370 sdev->srq_size, srp_max_req_size, DMA_FROM_DEVICE); 3371 sdev->ioctx_ring = NULL; 3372 kfree(sdev); 3373 } 3374 3375 static struct ib_client srpt_client = { 3376 .name = DRV_NAME, 3377 .add = srpt_add_one, 3378 .remove = srpt_remove_one 3379 }; 3380 3381 static int srpt_check_true(struct se_portal_group *se_tpg) 3382 { 3383 return 1; 3384 } 3385 3386 static int srpt_check_false(struct se_portal_group *se_tpg) 3387 { 3388 return 0; 3389 } 3390 3391 static char *srpt_get_fabric_name(void) 3392 { 3393 return "srpt"; 3394 } 3395 3396 static u8 srpt_get_fabric_proto_ident(struct se_portal_group *se_tpg) 3397 { 3398 return SCSI_TRANSPORTID_PROTOCOLID_SRP; 3399 } 3400 3401 static char *srpt_get_fabric_wwn(struct se_portal_group *tpg) 3402 { 3403 struct srpt_port *sport = container_of(tpg, struct srpt_port, port_tpg_1); 3404 3405 return sport->port_guid; 3406 } 3407 3408 static u16 srpt_get_tag(struct se_portal_group *tpg) 3409 { 3410 return 1; 3411 } 3412 3413 static u32 srpt_get_default_depth(struct se_portal_group *se_tpg) 3414 { 3415 return 1; 3416 } 3417 3418 static u32 srpt_get_pr_transport_id(struct se_portal_group *se_tpg, 3419 struct se_node_acl *se_nacl, 3420 struct t10_pr_registration *pr_reg, 3421 int *format_code, unsigned char *buf) 3422 { 3423 struct srpt_node_acl *nacl; 3424 struct spc_rdma_transport_id *tr_id; 3425 3426 nacl = container_of(se_nacl, struct srpt_node_acl, nacl); 3427 tr_id = (void *)buf; 3428 tr_id->protocol_identifier = SCSI_TRANSPORTID_PROTOCOLID_SRP; 3429 memcpy(tr_id->i_port_id, nacl->i_port_id, sizeof(tr_id->i_port_id)); 3430 return sizeof(*tr_id); 3431 } 3432 3433 static u32 srpt_get_pr_transport_id_len(struct se_portal_group *se_tpg, 3434 struct se_node_acl *se_nacl, 3435 struct t10_pr_registration *pr_reg, 3436 int *format_code) 3437 { 3438 *format_code = 0; 3439 return sizeof(struct spc_rdma_transport_id); 3440 } 3441 3442 static char *srpt_parse_pr_out_transport_id(struct se_portal_group *se_tpg, 3443 const char *buf, u32 *out_tid_len, 3444 char **port_nexus_ptr) 3445 { 3446 struct spc_rdma_transport_id *tr_id; 3447 3448 *port_nexus_ptr = NULL; 3449 *out_tid_len = sizeof(struct spc_rdma_transport_id); 3450 tr_id = (void *)buf; 3451 return (char *)tr_id->i_port_id; 3452 } 3453 3454 static struct se_node_acl *srpt_alloc_fabric_acl(struct se_portal_group *se_tpg) 3455 { 3456 struct srpt_node_acl *nacl; 3457 3458 nacl = kzalloc(sizeof(struct srpt_node_acl), GFP_KERNEL); 3459 if (!nacl) { 3460 printk(KERN_ERR "Unable to alocate struct srpt_node_acl\n"); 3461 return NULL; 3462 } 3463 3464 return &nacl->nacl; 3465 } 3466 3467 static void srpt_release_fabric_acl(struct se_portal_group *se_tpg, 3468 struct se_node_acl *se_nacl) 3469 { 3470 struct srpt_node_acl *nacl; 3471 3472 nacl = container_of(se_nacl, struct srpt_node_acl, nacl); 3473 kfree(nacl); 3474 } 3475 3476 static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg) 3477 { 3478 return 1; 3479 } 3480 3481 static void srpt_release_cmd(struct se_cmd *se_cmd) 3482 { 3483 } 3484 3485 /** 3486 * srpt_shutdown_session() - Whether or not a session may be shut down. 3487 */ 3488 static int srpt_shutdown_session(struct se_session *se_sess) 3489 { 3490 return true; 3491 } 3492 3493 /** 3494 * srpt_close_session() - Forcibly close a session. 3495 * 3496 * Callback function invoked by the TCM core to clean up sessions associated 3497 * with a node ACL when the user invokes 3498 * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id 3499 */ 3500 static void srpt_close_session(struct se_session *se_sess) 3501 { 3502 DECLARE_COMPLETION_ONSTACK(release_done); 3503 struct srpt_rdma_ch *ch; 3504 struct srpt_device *sdev; 3505 int res; 3506 3507 ch = se_sess->fabric_sess_ptr; 3508 WARN_ON(ch->sess != se_sess); 3509 3510 pr_debug("ch %p state %d\n", ch, srpt_get_ch_state(ch)); 3511 3512 sdev = ch->sport->sdev; 3513 spin_lock_irq(&sdev->spinlock); 3514 BUG_ON(ch->release_done); 3515 ch->release_done = &release_done; 3516 __srpt_close_ch(ch); 3517 spin_unlock_irq(&sdev->spinlock); 3518 3519 res = wait_for_completion_timeout(&release_done, 60 * HZ); 3520 WARN_ON(res <= 0); 3521 } 3522 3523 /** 3524 * To do: Find out whether stop_session() has a meaning for transports 3525 * other than iSCSI. 3526 */ 3527 static void srpt_stop_session(struct se_session *se_sess, int sess_sleep, 3528 int conn_sleep) 3529 { 3530 } 3531 3532 static void srpt_reset_nexus(struct se_session *sess) 3533 { 3534 printk(KERN_ERR "This is the SRP protocol, not iSCSI\n"); 3535 } 3536 3537 static int srpt_sess_logged_in(struct se_session *se_sess) 3538 { 3539 return true; 3540 } 3541 3542 /** 3543 * srpt_sess_get_index() - Return the value of scsiAttIntrPortIndex (SCSI-MIB). 3544 * 3545 * A quote from RFC 4455 (SCSI-MIB) about this MIB object: 3546 * This object represents an arbitrary integer used to uniquely identify a 3547 * particular attached remote initiator port to a particular SCSI target port 3548 * within a particular SCSI target device within a particular SCSI instance. 3549 */ 3550 static u32 srpt_sess_get_index(struct se_session *se_sess) 3551 { 3552 return 0; 3553 } 3554 3555 static void srpt_set_default_node_attrs(struct se_node_acl *nacl) 3556 { 3557 } 3558 3559 static u32 srpt_get_task_tag(struct se_cmd *se_cmd) 3560 { 3561 struct srpt_send_ioctx *ioctx; 3562 3563 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd); 3564 return ioctx->tag; 3565 } 3566 3567 /* Note: only used from inside debug printk's by the TCM core. */ 3568 static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd) 3569 { 3570 struct srpt_send_ioctx *ioctx; 3571 3572 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd); 3573 return srpt_get_cmd_state(ioctx); 3574 } 3575 3576 static u16 srpt_set_fabric_sense_len(struct se_cmd *cmd, u32 sense_length) 3577 { 3578 return 0; 3579 } 3580 3581 static u16 srpt_get_fabric_sense_len(void) 3582 { 3583 return 0; 3584 } 3585 3586 static int srpt_is_state_remove(struct se_cmd *se_cmd) 3587 { 3588 return 0; 3589 } 3590 3591 /** 3592 * srpt_parse_i_port_id() - Parse an initiator port ID. 3593 * @name: ASCII representation of a 128-bit initiator port ID. 3594 * @i_port_id: Binary 128-bit port ID. 3595 */ 3596 static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name) 3597 { 3598 const char *p; 3599 unsigned len, count, leading_zero_bytes; 3600 int ret, rc; 3601 3602 p = name; 3603 if (strnicmp(p, "0x", 2) == 0) 3604 p += 2; 3605 ret = -EINVAL; 3606 len = strlen(p); 3607 if (len % 2) 3608 goto out; 3609 count = min(len / 2, 16U); 3610 leading_zero_bytes = 16 - count; 3611 memset(i_port_id, 0, leading_zero_bytes); 3612 rc = hex2bin(i_port_id + leading_zero_bytes, p, count); 3613 if (rc < 0) 3614 pr_debug("hex2bin failed for srpt_parse_i_port_id: %d\n", rc); 3615 ret = 0; 3616 out: 3617 return ret; 3618 } 3619 3620 /* 3621 * configfs callback function invoked for 3622 * mkdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id 3623 */ 3624 static struct se_node_acl *srpt_make_nodeacl(struct se_portal_group *tpg, 3625 struct config_group *group, 3626 const char *name) 3627 { 3628 struct srpt_port *sport = container_of(tpg, struct srpt_port, port_tpg_1); 3629 struct se_node_acl *se_nacl, *se_nacl_new; 3630 struct srpt_node_acl *nacl; 3631 int ret = 0; 3632 u32 nexus_depth = 1; 3633 u8 i_port_id[16]; 3634 3635 if (srpt_parse_i_port_id(i_port_id, name) < 0) { 3636 printk(KERN_ERR "invalid initiator port ID %s\n", name); 3637 ret = -EINVAL; 3638 goto err; 3639 } 3640 3641 se_nacl_new = srpt_alloc_fabric_acl(tpg); 3642 if (!se_nacl_new) { 3643 ret = -ENOMEM; 3644 goto err; 3645 } 3646 /* 3647 * nacl_new may be released by core_tpg_add_initiator_node_acl() 3648 * when converting a node ACL from demo mode to explict 3649 */ 3650 se_nacl = core_tpg_add_initiator_node_acl(tpg, se_nacl_new, name, 3651 nexus_depth); 3652 if (IS_ERR(se_nacl)) { 3653 ret = PTR_ERR(se_nacl); 3654 goto err; 3655 } 3656 /* Locate our struct srpt_node_acl and set sdev and i_port_id. */ 3657 nacl = container_of(se_nacl, struct srpt_node_acl, nacl); 3658 memcpy(&nacl->i_port_id[0], &i_port_id[0], 16); 3659 nacl->sport = sport; 3660 3661 spin_lock_irq(&sport->port_acl_lock); 3662 list_add_tail(&nacl->list, &sport->port_acl_list); 3663 spin_unlock_irq(&sport->port_acl_lock); 3664 3665 return se_nacl; 3666 err: 3667 return ERR_PTR(ret); 3668 } 3669 3670 /* 3671 * configfs callback function invoked for 3672 * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id 3673 */ 3674 static void srpt_drop_nodeacl(struct se_node_acl *se_nacl) 3675 { 3676 struct srpt_node_acl *nacl; 3677 struct srpt_device *sdev; 3678 struct srpt_port *sport; 3679 3680 nacl = container_of(se_nacl, struct srpt_node_acl, nacl); 3681 sport = nacl->sport; 3682 sdev = sport->sdev; 3683 spin_lock_irq(&sport->port_acl_lock); 3684 list_del(&nacl->list); 3685 spin_unlock_irq(&sport->port_acl_lock); 3686 core_tpg_del_initiator_node_acl(&sport->port_tpg_1, se_nacl, 1); 3687 srpt_release_fabric_acl(NULL, se_nacl); 3688 } 3689 3690 static ssize_t srpt_tpg_attrib_show_srp_max_rdma_size( 3691 struct se_portal_group *se_tpg, 3692 char *page) 3693 { 3694 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); 3695 3696 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rdma_size); 3697 } 3698 3699 static ssize_t srpt_tpg_attrib_store_srp_max_rdma_size( 3700 struct se_portal_group *se_tpg, 3701 const char *page, 3702 size_t count) 3703 { 3704 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); 3705 unsigned long val; 3706 int ret; 3707 3708 ret = strict_strtoul(page, 0, &val); 3709 if (ret < 0) { 3710 pr_err("strict_strtoul() failed with ret: %d\n", ret); 3711 return -EINVAL; 3712 } 3713 if (val > MAX_SRPT_RDMA_SIZE) { 3714 pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val, 3715 MAX_SRPT_RDMA_SIZE); 3716 return -EINVAL; 3717 } 3718 if (val < DEFAULT_MAX_RDMA_SIZE) { 3719 pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n", 3720 val, DEFAULT_MAX_RDMA_SIZE); 3721 return -EINVAL; 3722 } 3723 sport->port_attrib.srp_max_rdma_size = val; 3724 3725 return count; 3726 } 3727 3728 TF_TPG_ATTRIB_ATTR(srpt, srp_max_rdma_size, S_IRUGO | S_IWUSR); 3729 3730 static ssize_t srpt_tpg_attrib_show_srp_max_rsp_size( 3731 struct se_portal_group *se_tpg, 3732 char *page) 3733 { 3734 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); 3735 3736 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rsp_size); 3737 } 3738 3739 static ssize_t srpt_tpg_attrib_store_srp_max_rsp_size( 3740 struct se_portal_group *se_tpg, 3741 const char *page, 3742 size_t count) 3743 { 3744 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); 3745 unsigned long val; 3746 int ret; 3747 3748 ret = strict_strtoul(page, 0, &val); 3749 if (ret < 0) { 3750 pr_err("strict_strtoul() failed with ret: %d\n", ret); 3751 return -EINVAL; 3752 } 3753 if (val > MAX_SRPT_RSP_SIZE) { 3754 pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val, 3755 MAX_SRPT_RSP_SIZE); 3756 return -EINVAL; 3757 } 3758 if (val < MIN_MAX_RSP_SIZE) { 3759 pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val, 3760 MIN_MAX_RSP_SIZE); 3761 return -EINVAL; 3762 } 3763 sport->port_attrib.srp_max_rsp_size = val; 3764 3765 return count; 3766 } 3767 3768 TF_TPG_ATTRIB_ATTR(srpt, srp_max_rsp_size, S_IRUGO | S_IWUSR); 3769 3770 static ssize_t srpt_tpg_attrib_show_srp_sq_size( 3771 struct se_portal_group *se_tpg, 3772 char *page) 3773 { 3774 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); 3775 3776 return sprintf(page, "%u\n", sport->port_attrib.srp_sq_size); 3777 } 3778 3779 static ssize_t srpt_tpg_attrib_store_srp_sq_size( 3780 struct se_portal_group *se_tpg, 3781 const char *page, 3782 size_t count) 3783 { 3784 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); 3785 unsigned long val; 3786 int ret; 3787 3788 ret = strict_strtoul(page, 0, &val); 3789 if (ret < 0) { 3790 pr_err("strict_strtoul() failed with ret: %d\n", ret); 3791 return -EINVAL; 3792 } 3793 if (val > MAX_SRPT_SRQ_SIZE) { 3794 pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val, 3795 MAX_SRPT_SRQ_SIZE); 3796 return -EINVAL; 3797 } 3798 if (val < MIN_SRPT_SRQ_SIZE) { 3799 pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val, 3800 MIN_SRPT_SRQ_SIZE); 3801 return -EINVAL; 3802 } 3803 sport->port_attrib.srp_sq_size = val; 3804 3805 return count; 3806 } 3807 3808 TF_TPG_ATTRIB_ATTR(srpt, srp_sq_size, S_IRUGO | S_IWUSR); 3809 3810 static struct configfs_attribute *srpt_tpg_attrib_attrs[] = { 3811 &srpt_tpg_attrib_srp_max_rdma_size.attr, 3812 &srpt_tpg_attrib_srp_max_rsp_size.attr, 3813 &srpt_tpg_attrib_srp_sq_size.attr, 3814 NULL, 3815 }; 3816 3817 static ssize_t srpt_tpg_show_enable( 3818 struct se_portal_group *se_tpg, 3819 char *page) 3820 { 3821 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); 3822 3823 return snprintf(page, PAGE_SIZE, "%d\n", (sport->enabled) ? 1: 0); 3824 } 3825 3826 static ssize_t srpt_tpg_store_enable( 3827 struct se_portal_group *se_tpg, 3828 const char *page, 3829 size_t count) 3830 { 3831 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); 3832 unsigned long tmp; 3833 int ret; 3834 3835 ret = strict_strtoul(page, 0, &tmp); 3836 if (ret < 0) { 3837 printk(KERN_ERR "Unable to extract srpt_tpg_store_enable\n"); 3838 return -EINVAL; 3839 } 3840 3841 if ((tmp != 0) && (tmp != 1)) { 3842 printk(KERN_ERR "Illegal value for srpt_tpg_store_enable: %lu\n", tmp); 3843 return -EINVAL; 3844 } 3845 if (tmp == 1) 3846 sport->enabled = true; 3847 else 3848 sport->enabled = false; 3849 3850 return count; 3851 } 3852 3853 TF_TPG_BASE_ATTR(srpt, enable, S_IRUGO | S_IWUSR); 3854 3855 static struct configfs_attribute *srpt_tpg_attrs[] = { 3856 &srpt_tpg_enable.attr, 3857 NULL, 3858 }; 3859 3860 /** 3861 * configfs callback invoked for 3862 * mkdir /sys/kernel/config/target/$driver/$port/$tpg 3863 */ 3864 static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn, 3865 struct config_group *group, 3866 const char *name) 3867 { 3868 struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn); 3869 int res; 3870 3871 /* Initialize sport->port_wwn and sport->port_tpg_1 */ 3872 res = core_tpg_register(&srpt_target->tf_ops, &sport->port_wwn, 3873 &sport->port_tpg_1, sport, TRANSPORT_TPG_TYPE_NORMAL); 3874 if (res) 3875 return ERR_PTR(res); 3876 3877 return &sport->port_tpg_1; 3878 } 3879 3880 /** 3881 * configfs callback invoked for 3882 * rmdir /sys/kernel/config/target/$driver/$port/$tpg 3883 */ 3884 static void srpt_drop_tpg(struct se_portal_group *tpg) 3885 { 3886 struct srpt_port *sport = container_of(tpg, 3887 struct srpt_port, port_tpg_1); 3888 3889 sport->enabled = false; 3890 core_tpg_deregister(&sport->port_tpg_1); 3891 } 3892 3893 /** 3894 * configfs callback invoked for 3895 * mkdir /sys/kernel/config/target/$driver/$port 3896 */ 3897 static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf, 3898 struct config_group *group, 3899 const char *name) 3900 { 3901 struct srpt_port *sport; 3902 int ret; 3903 3904 sport = srpt_lookup_port(name); 3905 pr_debug("make_tport(%s)\n", name); 3906 ret = -EINVAL; 3907 if (!sport) 3908 goto err; 3909 3910 return &sport->port_wwn; 3911 3912 err: 3913 return ERR_PTR(ret); 3914 } 3915 3916 /** 3917 * configfs callback invoked for 3918 * rmdir /sys/kernel/config/target/$driver/$port 3919 */ 3920 static void srpt_drop_tport(struct se_wwn *wwn) 3921 { 3922 struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn); 3923 3924 pr_debug("drop_tport(%s\n", config_item_name(&sport->port_wwn.wwn_group.cg_item)); 3925 } 3926 3927 static ssize_t srpt_wwn_show_attr_version(struct target_fabric_configfs *tf, 3928 char *buf) 3929 { 3930 return scnprintf(buf, PAGE_SIZE, "%s\n", DRV_VERSION); 3931 } 3932 3933 TF_WWN_ATTR_RO(srpt, version); 3934 3935 static struct configfs_attribute *srpt_wwn_attrs[] = { 3936 &srpt_wwn_version.attr, 3937 NULL, 3938 }; 3939 3940 static struct target_core_fabric_ops srpt_template = { 3941 .get_fabric_name = srpt_get_fabric_name, 3942 .get_fabric_proto_ident = srpt_get_fabric_proto_ident, 3943 .tpg_get_wwn = srpt_get_fabric_wwn, 3944 .tpg_get_tag = srpt_get_tag, 3945 .tpg_get_default_depth = srpt_get_default_depth, 3946 .tpg_get_pr_transport_id = srpt_get_pr_transport_id, 3947 .tpg_get_pr_transport_id_len = srpt_get_pr_transport_id_len, 3948 .tpg_parse_pr_out_transport_id = srpt_parse_pr_out_transport_id, 3949 .tpg_check_demo_mode = srpt_check_false, 3950 .tpg_check_demo_mode_cache = srpt_check_true, 3951 .tpg_check_demo_mode_write_protect = srpt_check_true, 3952 .tpg_check_prod_mode_write_protect = srpt_check_false, 3953 .tpg_alloc_fabric_acl = srpt_alloc_fabric_acl, 3954 .tpg_release_fabric_acl = srpt_release_fabric_acl, 3955 .tpg_get_inst_index = srpt_tpg_get_inst_index, 3956 .release_cmd = srpt_release_cmd, 3957 .check_stop_free = srpt_check_stop_free, 3958 .shutdown_session = srpt_shutdown_session, 3959 .close_session = srpt_close_session, 3960 .stop_session = srpt_stop_session, 3961 .fall_back_to_erl0 = srpt_reset_nexus, 3962 .sess_logged_in = srpt_sess_logged_in, 3963 .sess_get_index = srpt_sess_get_index, 3964 .sess_get_initiator_sid = NULL, 3965 .write_pending = srpt_write_pending, 3966 .write_pending_status = srpt_write_pending_status, 3967 .set_default_node_attributes = srpt_set_default_node_attrs, 3968 .get_task_tag = srpt_get_task_tag, 3969 .get_cmd_state = srpt_get_tcm_cmd_state, 3970 .queue_data_in = srpt_queue_response, 3971 .queue_status = srpt_queue_status, 3972 .queue_tm_rsp = srpt_queue_response, 3973 .get_fabric_sense_len = srpt_get_fabric_sense_len, 3974 .set_fabric_sense_len = srpt_set_fabric_sense_len, 3975 .is_state_remove = srpt_is_state_remove, 3976 /* 3977 * Setup function pointers for generic logic in 3978 * target_core_fabric_configfs.c 3979 */ 3980 .fabric_make_wwn = srpt_make_tport, 3981 .fabric_drop_wwn = srpt_drop_tport, 3982 .fabric_make_tpg = srpt_make_tpg, 3983 .fabric_drop_tpg = srpt_drop_tpg, 3984 .fabric_post_link = NULL, 3985 .fabric_pre_unlink = NULL, 3986 .fabric_make_np = NULL, 3987 .fabric_drop_np = NULL, 3988 .fabric_make_nodeacl = srpt_make_nodeacl, 3989 .fabric_drop_nodeacl = srpt_drop_nodeacl, 3990 }; 3991 3992 /** 3993 * srpt_init_module() - Kernel module initialization. 3994 * 3995 * Note: Since ib_register_client() registers callback functions, and since at 3996 * least one of these callback functions (srpt_add_one()) calls target core 3997 * functions, this driver must be registered with the target core before 3998 * ib_register_client() is called. 3999 */ 4000 static int __init srpt_init_module(void) 4001 { 4002 int ret; 4003 4004 ret = -EINVAL; 4005 if (srp_max_req_size < MIN_MAX_REQ_SIZE) { 4006 printk(KERN_ERR "invalid value %d for kernel module parameter" 4007 " srp_max_req_size -- must be at least %d.\n", 4008 srp_max_req_size, MIN_MAX_REQ_SIZE); 4009 goto out; 4010 } 4011 4012 if (srpt_srq_size < MIN_SRPT_SRQ_SIZE 4013 || srpt_srq_size > MAX_SRPT_SRQ_SIZE) { 4014 printk(KERN_ERR "invalid value %d for kernel module parameter" 4015 " srpt_srq_size -- must be in the range [%d..%d].\n", 4016 srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE); 4017 goto out; 4018 } 4019 4020 srpt_target = target_fabric_configfs_init(THIS_MODULE, "srpt"); 4021 if (IS_ERR(srpt_target)) { 4022 printk(KERN_ERR "couldn't register\n"); 4023 ret = PTR_ERR(srpt_target); 4024 goto out; 4025 } 4026 4027 srpt_target->tf_ops = srpt_template; 4028 4029 /* Enable SG chaining */ 4030 srpt_target->tf_ops.task_sg_chaining = true; 4031 4032 /* 4033 * Set up default attribute lists. 4034 */ 4035 srpt_target->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = srpt_wwn_attrs; 4036 srpt_target->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = srpt_tpg_attrs; 4037 srpt_target->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = srpt_tpg_attrib_attrs; 4038 srpt_target->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL; 4039 srpt_target->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL; 4040 srpt_target->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL; 4041 srpt_target->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL; 4042 srpt_target->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL; 4043 srpt_target->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL; 4044 4045 ret = target_fabric_configfs_register(srpt_target); 4046 if (ret < 0) { 4047 printk(KERN_ERR "couldn't register\n"); 4048 goto out_free_target; 4049 } 4050 4051 ret = ib_register_client(&srpt_client); 4052 if (ret) { 4053 printk(KERN_ERR "couldn't register IB client\n"); 4054 goto out_unregister_target; 4055 } 4056 4057 return 0; 4058 4059 out_unregister_target: 4060 target_fabric_configfs_deregister(srpt_target); 4061 srpt_target = NULL; 4062 out_free_target: 4063 if (srpt_target) 4064 target_fabric_configfs_free(srpt_target); 4065 out: 4066 return ret; 4067 } 4068 4069 static void __exit srpt_cleanup_module(void) 4070 { 4071 ib_unregister_client(&srpt_client); 4072 target_fabric_configfs_deregister(srpt_target); 4073 srpt_target = NULL; 4074 } 4075 4076 module_init(srpt_init_module); 4077 module_exit(srpt_cleanup_module); 4078