1 /* 2 * Copyright (c) 2004 Topspin Communications. All rights reserved. 3 * Copyright (c) 2005 Voltaire, Inc. All rights reserved. 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 * $Id: sa_query.c 2811 2005-07-06 18:11:43Z halr $ 34 */ 35 36 #include <linux/module.h> 37 #include <linux/init.h> 38 #include <linux/err.h> 39 #include <linux/random.h> 40 #include <linux/spinlock.h> 41 #include <linux/slab.h> 42 #include <linux/pci.h> 43 #include <linux/dma-mapping.h> 44 #include <linux/kref.h> 45 #include <linux/idr.h> 46 47 #include <rdma/ib_pack.h> 48 #include <rdma/ib_sa.h> 49 50 MODULE_AUTHOR("Roland Dreier"); 51 MODULE_DESCRIPTION("InfiniBand subnet administration query support"); 52 MODULE_LICENSE("Dual BSD/GPL"); 53 54 struct ib_sa_sm_ah { 55 struct ib_ah *ah; 56 struct kref ref; 57 }; 58 59 struct ib_sa_port { 60 struct ib_mad_agent *agent; 61 struct ib_sa_sm_ah *sm_ah; 62 struct work_struct update_task; 63 spinlock_t ah_lock; 64 u8 port_num; 65 }; 66 67 struct ib_sa_device { 68 int start_port, end_port; 69 struct ib_event_handler event_handler; 70 struct ib_sa_port port[0]; 71 }; 72 73 struct ib_sa_query { 74 void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *); 75 void (*release)(struct ib_sa_query *); 76 struct ib_sa_port *port; 77 struct ib_sa_mad *mad; 78 struct ib_sa_sm_ah *sm_ah; 79 DECLARE_PCI_UNMAP_ADDR(mapping) 80 int id; 81 }; 82 83 struct ib_sa_service_query { 84 void (*callback)(int, struct ib_sa_service_rec *, void *); 85 void *context; 86 struct ib_sa_query sa_query; 87 }; 88 89 struct ib_sa_path_query { 90 void (*callback)(int, struct ib_sa_path_rec *, void *); 91 void *context; 92 struct ib_sa_query sa_query; 93 }; 94 95 struct ib_sa_mcmember_query { 96 void (*callback)(int, struct ib_sa_mcmember_rec *, void *); 97 void *context; 98 struct ib_sa_query sa_query; 99 }; 100 101 static void ib_sa_add_one(struct ib_device *device); 102 static void ib_sa_remove_one(struct ib_device *device); 103 104 static struct ib_client sa_client = { 105 .name = "sa", 106 .add = ib_sa_add_one, 107 .remove = ib_sa_remove_one 108 }; 109 110 static spinlock_t idr_lock; 111 static DEFINE_IDR(query_idr); 112 113 static spinlock_t tid_lock; 114 static u32 tid; 115 116 #define PATH_REC_FIELD(field) \ 117 .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field), \ 118 .struct_size_bytes = sizeof ((struct ib_sa_path_rec *) 0)->field, \ 119 .field_name = "sa_path_rec:" #field 120 121 static const struct ib_field path_rec_table[] = { 122 { RESERVED, 123 .offset_words = 0, 124 .offset_bits = 0, 125 .size_bits = 32 }, 126 { RESERVED, 127 .offset_words = 1, 128 .offset_bits = 0, 129 .size_bits = 32 }, 130 { PATH_REC_FIELD(dgid), 131 .offset_words = 2, 132 .offset_bits = 0, 133 .size_bits = 128 }, 134 { PATH_REC_FIELD(sgid), 135 .offset_words = 6, 136 .offset_bits = 0, 137 .size_bits = 128 }, 138 { PATH_REC_FIELD(dlid), 139 .offset_words = 10, 140 .offset_bits = 0, 141 .size_bits = 16 }, 142 { PATH_REC_FIELD(slid), 143 .offset_words = 10, 144 .offset_bits = 16, 145 .size_bits = 16 }, 146 { PATH_REC_FIELD(raw_traffic), 147 .offset_words = 11, 148 .offset_bits = 0, 149 .size_bits = 1 }, 150 { RESERVED, 151 .offset_words = 11, 152 .offset_bits = 1, 153 .size_bits = 3 }, 154 { PATH_REC_FIELD(flow_label), 155 .offset_words = 11, 156 .offset_bits = 4, 157 .size_bits = 20 }, 158 { PATH_REC_FIELD(hop_limit), 159 .offset_words = 11, 160 .offset_bits = 24, 161 .size_bits = 8 }, 162 { PATH_REC_FIELD(traffic_class), 163 .offset_words = 12, 164 .offset_bits = 0, 165 .size_bits = 8 }, 166 { PATH_REC_FIELD(reversible), 167 .offset_words = 12, 168 .offset_bits = 8, 169 .size_bits = 1 }, 170 { PATH_REC_FIELD(numb_path), 171 .offset_words = 12, 172 .offset_bits = 9, 173 .size_bits = 7 }, 174 { PATH_REC_FIELD(pkey), 175 .offset_words = 12, 176 .offset_bits = 16, 177 .size_bits = 16 }, 178 { RESERVED, 179 .offset_words = 13, 180 .offset_bits = 0, 181 .size_bits = 12 }, 182 { PATH_REC_FIELD(sl), 183 .offset_words = 13, 184 .offset_bits = 12, 185 .size_bits = 4 }, 186 { PATH_REC_FIELD(mtu_selector), 187 .offset_words = 13, 188 .offset_bits = 16, 189 .size_bits = 2 }, 190 { PATH_REC_FIELD(mtu), 191 .offset_words = 13, 192 .offset_bits = 18, 193 .size_bits = 6 }, 194 { PATH_REC_FIELD(rate_selector), 195 .offset_words = 13, 196 .offset_bits = 24, 197 .size_bits = 2 }, 198 { PATH_REC_FIELD(rate), 199 .offset_words = 13, 200 .offset_bits = 26, 201 .size_bits = 6 }, 202 { PATH_REC_FIELD(packet_life_time_selector), 203 .offset_words = 14, 204 .offset_bits = 0, 205 .size_bits = 2 }, 206 { PATH_REC_FIELD(packet_life_time), 207 .offset_words = 14, 208 .offset_bits = 2, 209 .size_bits = 6 }, 210 { PATH_REC_FIELD(preference), 211 .offset_words = 14, 212 .offset_bits = 8, 213 .size_bits = 8 }, 214 { RESERVED, 215 .offset_words = 14, 216 .offset_bits = 16, 217 .size_bits = 48 }, 218 }; 219 220 #define MCMEMBER_REC_FIELD(field) \ 221 .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field), \ 222 .struct_size_bytes = sizeof ((struct ib_sa_mcmember_rec *) 0)->field, \ 223 .field_name = "sa_mcmember_rec:" #field 224 225 static const struct ib_field mcmember_rec_table[] = { 226 { MCMEMBER_REC_FIELD(mgid), 227 .offset_words = 0, 228 .offset_bits = 0, 229 .size_bits = 128 }, 230 { MCMEMBER_REC_FIELD(port_gid), 231 .offset_words = 4, 232 .offset_bits = 0, 233 .size_bits = 128 }, 234 { MCMEMBER_REC_FIELD(qkey), 235 .offset_words = 8, 236 .offset_bits = 0, 237 .size_bits = 32 }, 238 { MCMEMBER_REC_FIELD(mlid), 239 .offset_words = 9, 240 .offset_bits = 0, 241 .size_bits = 16 }, 242 { MCMEMBER_REC_FIELD(mtu_selector), 243 .offset_words = 9, 244 .offset_bits = 16, 245 .size_bits = 2 }, 246 { MCMEMBER_REC_FIELD(mtu), 247 .offset_words = 9, 248 .offset_bits = 18, 249 .size_bits = 6 }, 250 { MCMEMBER_REC_FIELD(traffic_class), 251 .offset_words = 9, 252 .offset_bits = 24, 253 .size_bits = 8 }, 254 { MCMEMBER_REC_FIELD(pkey), 255 .offset_words = 10, 256 .offset_bits = 0, 257 .size_bits = 16 }, 258 { MCMEMBER_REC_FIELD(rate_selector), 259 .offset_words = 10, 260 .offset_bits = 16, 261 .size_bits = 2 }, 262 { MCMEMBER_REC_FIELD(rate), 263 .offset_words = 10, 264 .offset_bits = 18, 265 .size_bits = 6 }, 266 { MCMEMBER_REC_FIELD(packet_life_time_selector), 267 .offset_words = 10, 268 .offset_bits = 24, 269 .size_bits = 2 }, 270 { MCMEMBER_REC_FIELD(packet_life_time), 271 .offset_words = 10, 272 .offset_bits = 26, 273 .size_bits = 6 }, 274 { MCMEMBER_REC_FIELD(sl), 275 .offset_words = 11, 276 .offset_bits = 0, 277 .size_bits = 4 }, 278 { MCMEMBER_REC_FIELD(flow_label), 279 .offset_words = 11, 280 .offset_bits = 4, 281 .size_bits = 20 }, 282 { MCMEMBER_REC_FIELD(hop_limit), 283 .offset_words = 11, 284 .offset_bits = 24, 285 .size_bits = 8 }, 286 { MCMEMBER_REC_FIELD(scope), 287 .offset_words = 12, 288 .offset_bits = 0, 289 .size_bits = 4 }, 290 { MCMEMBER_REC_FIELD(join_state), 291 .offset_words = 12, 292 .offset_bits = 4, 293 .size_bits = 4 }, 294 { MCMEMBER_REC_FIELD(proxy_join), 295 .offset_words = 12, 296 .offset_bits = 8, 297 .size_bits = 1 }, 298 { RESERVED, 299 .offset_words = 12, 300 .offset_bits = 9, 301 .size_bits = 23 }, 302 }; 303 304 #define SERVICE_REC_FIELD(field) \ 305 .struct_offset_bytes = offsetof(struct ib_sa_service_rec, field), \ 306 .struct_size_bytes = sizeof ((struct ib_sa_service_rec *) 0)->field, \ 307 .field_name = "sa_service_rec:" #field 308 309 static const struct ib_field service_rec_table[] = { 310 { SERVICE_REC_FIELD(id), 311 .offset_words = 0, 312 .offset_bits = 0, 313 .size_bits = 64 }, 314 { SERVICE_REC_FIELD(gid), 315 .offset_words = 2, 316 .offset_bits = 0, 317 .size_bits = 128 }, 318 { SERVICE_REC_FIELD(pkey), 319 .offset_words = 6, 320 .offset_bits = 0, 321 .size_bits = 16 }, 322 { SERVICE_REC_FIELD(lease), 323 .offset_words = 7, 324 .offset_bits = 0, 325 .size_bits = 32 }, 326 { SERVICE_REC_FIELD(key), 327 .offset_words = 8, 328 .offset_bits = 0, 329 .size_bits = 128 }, 330 { SERVICE_REC_FIELD(name), 331 .offset_words = 12, 332 .offset_bits = 0, 333 .size_bits = 64*8 }, 334 { SERVICE_REC_FIELD(data8), 335 .offset_words = 28, 336 .offset_bits = 0, 337 .size_bits = 16*8 }, 338 { SERVICE_REC_FIELD(data16), 339 .offset_words = 32, 340 .offset_bits = 0, 341 .size_bits = 8*16 }, 342 { SERVICE_REC_FIELD(data32), 343 .offset_words = 36, 344 .offset_bits = 0, 345 .size_bits = 4*32 }, 346 { SERVICE_REC_FIELD(data64), 347 .offset_words = 40, 348 .offset_bits = 0, 349 .size_bits = 2*64 }, 350 }; 351 352 static void free_sm_ah(struct kref *kref) 353 { 354 struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref); 355 356 ib_destroy_ah(sm_ah->ah); 357 kfree(sm_ah); 358 } 359 360 static void update_sm_ah(void *port_ptr) 361 { 362 struct ib_sa_port *port = port_ptr; 363 struct ib_sa_sm_ah *new_ah, *old_ah; 364 struct ib_port_attr port_attr; 365 struct ib_ah_attr ah_attr; 366 367 if (ib_query_port(port->agent->device, port->port_num, &port_attr)) { 368 printk(KERN_WARNING "Couldn't query port\n"); 369 return; 370 } 371 372 new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL); 373 if (!new_ah) { 374 printk(KERN_WARNING "Couldn't allocate new SM AH\n"); 375 return; 376 } 377 378 kref_init(&new_ah->ref); 379 380 memset(&ah_attr, 0, sizeof ah_attr); 381 ah_attr.dlid = port_attr.sm_lid; 382 ah_attr.sl = port_attr.sm_sl; 383 ah_attr.port_num = port->port_num; 384 385 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr); 386 if (IS_ERR(new_ah->ah)) { 387 printk(KERN_WARNING "Couldn't create new SM AH\n"); 388 kfree(new_ah); 389 return; 390 } 391 392 spin_lock_irq(&port->ah_lock); 393 old_ah = port->sm_ah; 394 port->sm_ah = new_ah; 395 spin_unlock_irq(&port->ah_lock); 396 397 if (old_ah) 398 kref_put(&old_ah->ref, free_sm_ah); 399 } 400 401 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event) 402 { 403 if (event->event == IB_EVENT_PORT_ERR || 404 event->event == IB_EVENT_PORT_ACTIVE || 405 event->event == IB_EVENT_LID_CHANGE || 406 event->event == IB_EVENT_PKEY_CHANGE || 407 event->event == IB_EVENT_SM_CHANGE) { 408 struct ib_sa_device *sa_dev; 409 sa_dev = container_of(handler, typeof(*sa_dev), event_handler); 410 411 schedule_work(&sa_dev->port[event->element.port_num - 412 sa_dev->start_port].update_task); 413 } 414 } 415 416 /** 417 * ib_sa_cancel_query - try to cancel an SA query 418 * @id:ID of query to cancel 419 * @query:query pointer to cancel 420 * 421 * Try to cancel an SA query. If the id and query don't match up or 422 * the query has already completed, nothing is done. Otherwise the 423 * query is canceled and will complete with a status of -EINTR. 424 */ 425 void ib_sa_cancel_query(int id, struct ib_sa_query *query) 426 { 427 unsigned long flags; 428 struct ib_mad_agent *agent; 429 430 spin_lock_irqsave(&idr_lock, flags); 431 if (idr_find(&query_idr, id) != query) { 432 spin_unlock_irqrestore(&idr_lock, flags); 433 return; 434 } 435 agent = query->port->agent; 436 spin_unlock_irqrestore(&idr_lock, flags); 437 438 ib_cancel_mad(agent, id); 439 } 440 EXPORT_SYMBOL(ib_sa_cancel_query); 441 442 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent) 443 { 444 unsigned long flags; 445 446 memset(mad, 0, sizeof *mad); 447 448 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION; 449 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM; 450 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION; 451 452 spin_lock_irqsave(&tid_lock, flags); 453 mad->mad_hdr.tid = 454 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++); 455 spin_unlock_irqrestore(&tid_lock, flags); 456 } 457 458 static int send_mad(struct ib_sa_query *query, int timeout_ms) 459 { 460 struct ib_sa_port *port = query->port; 461 unsigned long flags; 462 int ret; 463 struct ib_sge gather_list; 464 struct ib_send_wr *bad_wr, wr = { 465 .opcode = IB_WR_SEND, 466 .sg_list = &gather_list, 467 .num_sge = 1, 468 .send_flags = IB_SEND_SIGNALED, 469 .wr = { 470 .ud = { 471 .mad_hdr = &query->mad->mad_hdr, 472 .remote_qpn = 1, 473 .remote_qkey = IB_QP1_QKEY, 474 .timeout_ms = timeout_ms, 475 } 476 } 477 }; 478 479 retry: 480 if (!idr_pre_get(&query_idr, GFP_ATOMIC)) 481 return -ENOMEM; 482 spin_lock_irqsave(&idr_lock, flags); 483 ret = idr_get_new(&query_idr, query, &query->id); 484 spin_unlock_irqrestore(&idr_lock, flags); 485 if (ret == -EAGAIN) 486 goto retry; 487 if (ret) 488 return ret; 489 490 wr.wr_id = query->id; 491 492 spin_lock_irqsave(&port->ah_lock, flags); 493 kref_get(&port->sm_ah->ref); 494 query->sm_ah = port->sm_ah; 495 wr.wr.ud.ah = port->sm_ah->ah; 496 spin_unlock_irqrestore(&port->ah_lock, flags); 497 498 gather_list.addr = dma_map_single(port->agent->device->dma_device, 499 query->mad, 500 sizeof (struct ib_sa_mad), 501 DMA_TO_DEVICE); 502 gather_list.length = sizeof (struct ib_sa_mad); 503 gather_list.lkey = port->agent->mr->lkey; 504 pci_unmap_addr_set(query, mapping, gather_list.addr); 505 506 ret = ib_post_send_mad(port->agent, &wr, &bad_wr); 507 if (ret) { 508 dma_unmap_single(port->agent->device->dma_device, 509 pci_unmap_addr(query, mapping), 510 sizeof (struct ib_sa_mad), 511 DMA_TO_DEVICE); 512 kref_put(&query->sm_ah->ref, free_sm_ah); 513 spin_lock_irqsave(&idr_lock, flags); 514 idr_remove(&query_idr, query->id); 515 spin_unlock_irqrestore(&idr_lock, flags); 516 } 517 518 /* 519 * It's not safe to dereference query any more, because the 520 * send may already have completed and freed the query in 521 * another context. So use wr.wr_id, which has a copy of the 522 * query's id. 523 */ 524 return ret ? ret : wr.wr_id; 525 } 526 527 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query, 528 int status, 529 struct ib_sa_mad *mad) 530 { 531 struct ib_sa_path_query *query = 532 container_of(sa_query, struct ib_sa_path_query, sa_query); 533 534 if (mad) { 535 struct ib_sa_path_rec rec; 536 537 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), 538 mad->data, &rec); 539 query->callback(status, &rec, query->context); 540 } else 541 query->callback(status, NULL, query->context); 542 } 543 544 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query) 545 { 546 kfree(sa_query->mad); 547 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query)); 548 } 549 550 /** 551 * ib_sa_path_rec_get - Start a Path get query 552 * @device:device to send query on 553 * @port_num: port number to send query on 554 * @rec:Path Record to send in query 555 * @comp_mask:component mask to send in query 556 * @timeout_ms:time to wait for response 557 * @gfp_mask:GFP mask to use for internal allocations 558 * @callback:function called when query completes, times out or is 559 * canceled 560 * @context:opaque user context passed to callback 561 * @sa_query:query context, used to cancel query 562 * 563 * Send a Path Record Get query to the SA to look up a path. The 564 * callback function will be called when the query completes (or 565 * fails); status is 0 for a successful response, -EINTR if the query 566 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error 567 * occurred sending the query. The resp parameter of the callback is 568 * only valid if status is 0. 569 * 570 * If the return value of ib_sa_path_rec_get() is negative, it is an 571 * error code. Otherwise it is a query ID that can be used to cancel 572 * the query. 573 */ 574 int ib_sa_path_rec_get(struct ib_device *device, u8 port_num, 575 struct ib_sa_path_rec *rec, 576 ib_sa_comp_mask comp_mask, 577 int timeout_ms, gfp_t gfp_mask, 578 void (*callback)(int status, 579 struct ib_sa_path_rec *resp, 580 void *context), 581 void *context, 582 struct ib_sa_query **sa_query) 583 { 584 struct ib_sa_path_query *query; 585 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 586 struct ib_sa_port *port = &sa_dev->port[port_num - sa_dev->start_port]; 587 struct ib_mad_agent *agent = port->agent; 588 int ret; 589 590 query = kmalloc(sizeof *query, gfp_mask); 591 if (!query) 592 return -ENOMEM; 593 query->sa_query.mad = kmalloc(sizeof *query->sa_query.mad, gfp_mask); 594 if (!query->sa_query.mad) { 595 kfree(query); 596 return -ENOMEM; 597 } 598 599 query->callback = callback; 600 query->context = context; 601 602 init_mad(query->sa_query.mad, agent); 603 604 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL; 605 query->sa_query.release = ib_sa_path_rec_release; 606 query->sa_query.port = port; 607 query->sa_query.mad->mad_hdr.method = IB_MGMT_METHOD_GET; 608 query->sa_query.mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC); 609 query->sa_query.mad->sa_hdr.comp_mask = comp_mask; 610 611 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), 612 rec, query->sa_query.mad->data); 613 614 *sa_query = &query->sa_query; 615 616 ret = send_mad(&query->sa_query, timeout_ms); 617 if (ret < 0) { 618 *sa_query = NULL; 619 kfree(query->sa_query.mad); 620 kfree(query); 621 } 622 623 return ret; 624 } 625 EXPORT_SYMBOL(ib_sa_path_rec_get); 626 627 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query, 628 int status, 629 struct ib_sa_mad *mad) 630 { 631 struct ib_sa_service_query *query = 632 container_of(sa_query, struct ib_sa_service_query, sa_query); 633 634 if (mad) { 635 struct ib_sa_service_rec rec; 636 637 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table), 638 mad->data, &rec); 639 query->callback(status, &rec, query->context); 640 } else 641 query->callback(status, NULL, query->context); 642 } 643 644 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query) 645 { 646 kfree(sa_query->mad); 647 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query)); 648 } 649 650 /** 651 * ib_sa_service_rec_query - Start Service Record operation 652 * @device:device to send request on 653 * @port_num: port number to send request on 654 * @method:SA method - should be get, set, or delete 655 * @rec:Service Record to send in request 656 * @comp_mask:component mask to send in request 657 * @timeout_ms:time to wait for response 658 * @gfp_mask:GFP mask to use for internal allocations 659 * @callback:function called when request completes, times out or is 660 * canceled 661 * @context:opaque user context passed to callback 662 * @sa_query:request context, used to cancel request 663 * 664 * Send a Service Record set/get/delete to the SA to register, 665 * unregister or query a service record. 666 * The callback function will be called when the request completes (or 667 * fails); status is 0 for a successful response, -EINTR if the query 668 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error 669 * occurred sending the query. The resp parameter of the callback is 670 * only valid if status is 0. 671 * 672 * If the return value of ib_sa_service_rec_query() is negative, it is an 673 * error code. Otherwise it is a request ID that can be used to cancel 674 * the query. 675 */ 676 int ib_sa_service_rec_query(struct ib_device *device, u8 port_num, u8 method, 677 struct ib_sa_service_rec *rec, 678 ib_sa_comp_mask comp_mask, 679 int timeout_ms, gfp_t gfp_mask, 680 void (*callback)(int status, 681 struct ib_sa_service_rec *resp, 682 void *context), 683 void *context, 684 struct ib_sa_query **sa_query) 685 { 686 struct ib_sa_service_query *query; 687 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 688 struct ib_sa_port *port = &sa_dev->port[port_num - sa_dev->start_port]; 689 struct ib_mad_agent *agent = port->agent; 690 int ret; 691 692 if (method != IB_MGMT_METHOD_GET && 693 method != IB_MGMT_METHOD_SET && 694 method != IB_SA_METHOD_DELETE) 695 return -EINVAL; 696 697 query = kmalloc(sizeof *query, gfp_mask); 698 if (!query) 699 return -ENOMEM; 700 query->sa_query.mad = kmalloc(sizeof *query->sa_query.mad, gfp_mask); 701 if (!query->sa_query.mad) { 702 kfree(query); 703 return -ENOMEM; 704 } 705 706 query->callback = callback; 707 query->context = context; 708 709 init_mad(query->sa_query.mad, agent); 710 711 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL; 712 query->sa_query.release = ib_sa_service_rec_release; 713 query->sa_query.port = port; 714 query->sa_query.mad->mad_hdr.method = method; 715 query->sa_query.mad->mad_hdr.attr_id = 716 cpu_to_be16(IB_SA_ATTR_SERVICE_REC); 717 query->sa_query.mad->sa_hdr.comp_mask = comp_mask; 718 719 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table), 720 rec, query->sa_query.mad->data); 721 722 *sa_query = &query->sa_query; 723 724 ret = send_mad(&query->sa_query, timeout_ms); 725 if (ret < 0) { 726 *sa_query = NULL; 727 kfree(query->sa_query.mad); 728 kfree(query); 729 } 730 731 return ret; 732 } 733 EXPORT_SYMBOL(ib_sa_service_rec_query); 734 735 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query, 736 int status, 737 struct ib_sa_mad *mad) 738 { 739 struct ib_sa_mcmember_query *query = 740 container_of(sa_query, struct ib_sa_mcmember_query, sa_query); 741 742 if (mad) { 743 struct ib_sa_mcmember_rec rec; 744 745 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table), 746 mad->data, &rec); 747 query->callback(status, &rec, query->context); 748 } else 749 query->callback(status, NULL, query->context); 750 } 751 752 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query) 753 { 754 kfree(sa_query->mad); 755 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query)); 756 } 757 758 int ib_sa_mcmember_rec_query(struct ib_device *device, u8 port_num, 759 u8 method, 760 struct ib_sa_mcmember_rec *rec, 761 ib_sa_comp_mask comp_mask, 762 int timeout_ms, gfp_t gfp_mask, 763 void (*callback)(int status, 764 struct ib_sa_mcmember_rec *resp, 765 void *context), 766 void *context, 767 struct ib_sa_query **sa_query) 768 { 769 struct ib_sa_mcmember_query *query; 770 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 771 struct ib_sa_port *port = &sa_dev->port[port_num - sa_dev->start_port]; 772 struct ib_mad_agent *agent = port->agent; 773 int ret; 774 775 query = kmalloc(sizeof *query, gfp_mask); 776 if (!query) 777 return -ENOMEM; 778 query->sa_query.mad = kmalloc(sizeof *query->sa_query.mad, gfp_mask); 779 if (!query->sa_query.mad) { 780 kfree(query); 781 return -ENOMEM; 782 } 783 784 query->callback = callback; 785 query->context = context; 786 787 init_mad(query->sa_query.mad, agent); 788 789 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL; 790 query->sa_query.release = ib_sa_mcmember_rec_release; 791 query->sa_query.port = port; 792 query->sa_query.mad->mad_hdr.method = method; 793 query->sa_query.mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC); 794 query->sa_query.mad->sa_hdr.comp_mask = comp_mask; 795 796 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table), 797 rec, query->sa_query.mad->data); 798 799 *sa_query = &query->sa_query; 800 801 ret = send_mad(&query->sa_query, timeout_ms); 802 if (ret < 0) { 803 *sa_query = NULL; 804 kfree(query->sa_query.mad); 805 kfree(query); 806 } 807 808 return ret; 809 } 810 EXPORT_SYMBOL(ib_sa_mcmember_rec_query); 811 812 static void send_handler(struct ib_mad_agent *agent, 813 struct ib_mad_send_wc *mad_send_wc) 814 { 815 struct ib_sa_query *query; 816 unsigned long flags; 817 818 spin_lock_irqsave(&idr_lock, flags); 819 query = idr_find(&query_idr, mad_send_wc->wr_id); 820 spin_unlock_irqrestore(&idr_lock, flags); 821 822 if (!query) 823 return; 824 825 if (query->callback) 826 switch (mad_send_wc->status) { 827 case IB_WC_SUCCESS: 828 /* No callback -- already got recv */ 829 break; 830 case IB_WC_RESP_TIMEOUT_ERR: 831 query->callback(query, -ETIMEDOUT, NULL); 832 break; 833 case IB_WC_WR_FLUSH_ERR: 834 query->callback(query, -EINTR, NULL); 835 break; 836 default: 837 query->callback(query, -EIO, NULL); 838 break; 839 } 840 841 dma_unmap_single(agent->device->dma_device, 842 pci_unmap_addr(query, mapping), 843 sizeof (struct ib_sa_mad), 844 DMA_TO_DEVICE); 845 kref_put(&query->sm_ah->ref, free_sm_ah); 846 847 query->release(query); 848 849 spin_lock_irqsave(&idr_lock, flags); 850 idr_remove(&query_idr, mad_send_wc->wr_id); 851 spin_unlock_irqrestore(&idr_lock, flags); 852 } 853 854 static void recv_handler(struct ib_mad_agent *mad_agent, 855 struct ib_mad_recv_wc *mad_recv_wc) 856 { 857 struct ib_sa_query *query; 858 unsigned long flags; 859 860 spin_lock_irqsave(&idr_lock, flags); 861 query = idr_find(&query_idr, mad_recv_wc->wc->wr_id); 862 spin_unlock_irqrestore(&idr_lock, flags); 863 864 if (query && query->callback) { 865 if (mad_recv_wc->wc->status == IB_WC_SUCCESS) 866 query->callback(query, 867 mad_recv_wc->recv_buf.mad->mad_hdr.status ? 868 -EINVAL : 0, 869 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad); 870 else 871 query->callback(query, -EIO, NULL); 872 } 873 874 ib_free_recv_mad(mad_recv_wc); 875 } 876 877 static void ib_sa_add_one(struct ib_device *device) 878 { 879 struct ib_sa_device *sa_dev; 880 int s, e, i; 881 882 if (device->node_type == IB_NODE_SWITCH) 883 s = e = 0; 884 else { 885 s = 1; 886 e = device->phys_port_cnt; 887 } 888 889 sa_dev = kmalloc(sizeof *sa_dev + 890 (e - s + 1) * sizeof (struct ib_sa_port), 891 GFP_KERNEL); 892 if (!sa_dev) 893 return; 894 895 sa_dev->start_port = s; 896 sa_dev->end_port = e; 897 898 for (i = 0; i <= e - s; ++i) { 899 sa_dev->port[i].sm_ah = NULL; 900 sa_dev->port[i].port_num = i + s; 901 spin_lock_init(&sa_dev->port[i].ah_lock); 902 903 sa_dev->port[i].agent = 904 ib_register_mad_agent(device, i + s, IB_QPT_GSI, 905 NULL, 0, send_handler, 906 recv_handler, sa_dev); 907 if (IS_ERR(sa_dev->port[i].agent)) 908 goto err; 909 910 INIT_WORK(&sa_dev->port[i].update_task, 911 update_sm_ah, &sa_dev->port[i]); 912 } 913 914 ib_set_client_data(device, &sa_client, sa_dev); 915 916 /* 917 * We register our event handler after everything is set up, 918 * and then update our cached info after the event handler is 919 * registered to avoid any problems if a port changes state 920 * during our initialization. 921 */ 922 923 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event); 924 if (ib_register_event_handler(&sa_dev->event_handler)) 925 goto err; 926 927 for (i = 0; i <= e - s; ++i) 928 update_sm_ah(&sa_dev->port[i]); 929 930 return; 931 932 err: 933 while (--i >= 0) 934 ib_unregister_mad_agent(sa_dev->port[i].agent); 935 936 kfree(sa_dev); 937 938 return; 939 } 940 941 static void ib_sa_remove_one(struct ib_device *device) 942 { 943 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 944 int i; 945 946 if (!sa_dev) 947 return; 948 949 ib_unregister_event_handler(&sa_dev->event_handler); 950 951 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) { 952 ib_unregister_mad_agent(sa_dev->port[i].agent); 953 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah); 954 } 955 956 kfree(sa_dev); 957 } 958 959 static int __init ib_sa_init(void) 960 { 961 int ret; 962 963 spin_lock_init(&idr_lock); 964 spin_lock_init(&tid_lock); 965 966 get_random_bytes(&tid, sizeof tid); 967 968 ret = ib_register_client(&sa_client); 969 if (ret) 970 printk(KERN_ERR "Couldn't register ib_sa client\n"); 971 972 return ret; 973 } 974 975 static void __exit ib_sa_cleanup(void) 976 { 977 ib_unregister_client(&sa_client); 978 } 979 980 module_init(ib_sa_init); 981 module_exit(ib_sa_cleanup); 982