1 /* 2 * Copyright (c) 2004 Topspin Communications. All rights reserved. 3 * Copyright (c) 2005 Voltaire, Inc. All rights reserved. 4 * Copyright (c) 2006 Intel Corporation. All rights reserved. 5 * 6 * This software is available to you under a choice of one of two 7 * licenses. You may choose to be licensed under the terms of the GNU 8 * General Public License (GPL) Version 2, available from the file 9 * COPYING in the main directory of this source tree, or the 10 * OpenIB.org BSD license below: 11 * 12 * Redistribution and use in source and binary forms, with or 13 * without modification, are permitted provided that the following 14 * conditions are met: 15 * 16 * - Redistributions of source code must retain the above 17 * copyright notice, this list of conditions and the following 18 * disclaimer. 19 * 20 * - Redistributions in binary form must reproduce the above 21 * copyright notice, this list of conditions and the following 22 * disclaimer in the documentation and/or other materials 23 * provided with the distribution. 24 * 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 32 * SOFTWARE. 33 * 34 * $Id: sa_query.c 2811 2005-07-06 18:11:43Z halr $ 35 */ 36 37 #include <linux/module.h> 38 #include <linux/init.h> 39 #include <linux/err.h> 40 #include <linux/random.h> 41 #include <linux/spinlock.h> 42 #include <linux/slab.h> 43 #include <linux/pci.h> 44 #include <linux/dma-mapping.h> 45 #include <linux/kref.h> 46 #include <linux/idr.h> 47 #include <linux/workqueue.h> 48 49 #include <rdma/ib_pack.h> 50 #include <rdma/ib_cache.h> 51 #include "sa.h" 52 53 MODULE_AUTHOR("Roland Dreier"); 54 MODULE_DESCRIPTION("InfiniBand subnet administration query support"); 55 MODULE_LICENSE("Dual BSD/GPL"); 56 57 struct ib_sa_sm_ah { 58 struct ib_ah *ah; 59 struct kref ref; 60 }; 61 62 struct ib_sa_port { 63 struct ib_mad_agent *agent; 64 struct ib_sa_sm_ah *sm_ah; 65 struct work_struct update_task; 66 spinlock_t ah_lock; 67 u8 port_num; 68 }; 69 70 struct ib_sa_device { 71 int start_port, end_port; 72 struct ib_event_handler event_handler; 73 struct ib_sa_port port[0]; 74 }; 75 76 struct ib_sa_query { 77 void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *); 78 void (*release)(struct ib_sa_query *); 79 struct ib_sa_client *client; 80 struct ib_sa_port *port; 81 struct ib_mad_send_buf *mad_buf; 82 struct ib_sa_sm_ah *sm_ah; 83 int id; 84 }; 85 86 struct ib_sa_service_query { 87 void (*callback)(int, struct ib_sa_service_rec *, void *); 88 void *context; 89 struct ib_sa_query sa_query; 90 }; 91 92 struct ib_sa_path_query { 93 void (*callback)(int, struct ib_sa_path_rec *, void *); 94 void *context; 95 struct ib_sa_query sa_query; 96 }; 97 98 struct ib_sa_mcmember_query { 99 void (*callback)(int, struct ib_sa_mcmember_rec *, void *); 100 void *context; 101 struct ib_sa_query sa_query; 102 }; 103 104 static void ib_sa_add_one(struct ib_device *device); 105 static void ib_sa_remove_one(struct ib_device *device); 106 107 static struct ib_client sa_client = { 108 .name = "sa", 109 .add = ib_sa_add_one, 110 .remove = ib_sa_remove_one 111 }; 112 113 static spinlock_t idr_lock; 114 static DEFINE_IDR(query_idr); 115 116 static spinlock_t tid_lock; 117 static u32 tid; 118 119 #define PATH_REC_FIELD(field) \ 120 .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field), \ 121 .struct_size_bytes = sizeof ((struct ib_sa_path_rec *) 0)->field, \ 122 .field_name = "sa_path_rec:" #field 123 124 static const struct ib_field path_rec_table[] = { 125 { RESERVED, 126 .offset_words = 0, 127 .offset_bits = 0, 128 .size_bits = 32 }, 129 { RESERVED, 130 .offset_words = 1, 131 .offset_bits = 0, 132 .size_bits = 32 }, 133 { PATH_REC_FIELD(dgid), 134 .offset_words = 2, 135 .offset_bits = 0, 136 .size_bits = 128 }, 137 { PATH_REC_FIELD(sgid), 138 .offset_words = 6, 139 .offset_bits = 0, 140 .size_bits = 128 }, 141 { PATH_REC_FIELD(dlid), 142 .offset_words = 10, 143 .offset_bits = 0, 144 .size_bits = 16 }, 145 { PATH_REC_FIELD(slid), 146 .offset_words = 10, 147 .offset_bits = 16, 148 .size_bits = 16 }, 149 { PATH_REC_FIELD(raw_traffic), 150 .offset_words = 11, 151 .offset_bits = 0, 152 .size_bits = 1 }, 153 { RESERVED, 154 .offset_words = 11, 155 .offset_bits = 1, 156 .size_bits = 3 }, 157 { PATH_REC_FIELD(flow_label), 158 .offset_words = 11, 159 .offset_bits = 4, 160 .size_bits = 20 }, 161 { PATH_REC_FIELD(hop_limit), 162 .offset_words = 11, 163 .offset_bits = 24, 164 .size_bits = 8 }, 165 { PATH_REC_FIELD(traffic_class), 166 .offset_words = 12, 167 .offset_bits = 0, 168 .size_bits = 8 }, 169 { PATH_REC_FIELD(reversible), 170 .offset_words = 12, 171 .offset_bits = 8, 172 .size_bits = 1 }, 173 { PATH_REC_FIELD(numb_path), 174 .offset_words = 12, 175 .offset_bits = 9, 176 .size_bits = 7 }, 177 { PATH_REC_FIELD(pkey), 178 .offset_words = 12, 179 .offset_bits = 16, 180 .size_bits = 16 }, 181 { RESERVED, 182 .offset_words = 13, 183 .offset_bits = 0, 184 .size_bits = 12 }, 185 { PATH_REC_FIELD(sl), 186 .offset_words = 13, 187 .offset_bits = 12, 188 .size_bits = 4 }, 189 { PATH_REC_FIELD(mtu_selector), 190 .offset_words = 13, 191 .offset_bits = 16, 192 .size_bits = 2 }, 193 { PATH_REC_FIELD(mtu), 194 .offset_words = 13, 195 .offset_bits = 18, 196 .size_bits = 6 }, 197 { PATH_REC_FIELD(rate_selector), 198 .offset_words = 13, 199 .offset_bits = 24, 200 .size_bits = 2 }, 201 { PATH_REC_FIELD(rate), 202 .offset_words = 13, 203 .offset_bits = 26, 204 .size_bits = 6 }, 205 { PATH_REC_FIELD(packet_life_time_selector), 206 .offset_words = 14, 207 .offset_bits = 0, 208 .size_bits = 2 }, 209 { PATH_REC_FIELD(packet_life_time), 210 .offset_words = 14, 211 .offset_bits = 2, 212 .size_bits = 6 }, 213 { PATH_REC_FIELD(preference), 214 .offset_words = 14, 215 .offset_bits = 8, 216 .size_bits = 8 }, 217 { RESERVED, 218 .offset_words = 14, 219 .offset_bits = 16, 220 .size_bits = 48 }, 221 }; 222 223 #define MCMEMBER_REC_FIELD(field) \ 224 .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field), \ 225 .struct_size_bytes = sizeof ((struct ib_sa_mcmember_rec *) 0)->field, \ 226 .field_name = "sa_mcmember_rec:" #field 227 228 static const struct ib_field mcmember_rec_table[] = { 229 { MCMEMBER_REC_FIELD(mgid), 230 .offset_words = 0, 231 .offset_bits = 0, 232 .size_bits = 128 }, 233 { MCMEMBER_REC_FIELD(port_gid), 234 .offset_words = 4, 235 .offset_bits = 0, 236 .size_bits = 128 }, 237 { MCMEMBER_REC_FIELD(qkey), 238 .offset_words = 8, 239 .offset_bits = 0, 240 .size_bits = 32 }, 241 { MCMEMBER_REC_FIELD(mlid), 242 .offset_words = 9, 243 .offset_bits = 0, 244 .size_bits = 16 }, 245 { MCMEMBER_REC_FIELD(mtu_selector), 246 .offset_words = 9, 247 .offset_bits = 16, 248 .size_bits = 2 }, 249 { MCMEMBER_REC_FIELD(mtu), 250 .offset_words = 9, 251 .offset_bits = 18, 252 .size_bits = 6 }, 253 { MCMEMBER_REC_FIELD(traffic_class), 254 .offset_words = 9, 255 .offset_bits = 24, 256 .size_bits = 8 }, 257 { MCMEMBER_REC_FIELD(pkey), 258 .offset_words = 10, 259 .offset_bits = 0, 260 .size_bits = 16 }, 261 { MCMEMBER_REC_FIELD(rate_selector), 262 .offset_words = 10, 263 .offset_bits = 16, 264 .size_bits = 2 }, 265 { MCMEMBER_REC_FIELD(rate), 266 .offset_words = 10, 267 .offset_bits = 18, 268 .size_bits = 6 }, 269 { MCMEMBER_REC_FIELD(packet_life_time_selector), 270 .offset_words = 10, 271 .offset_bits = 24, 272 .size_bits = 2 }, 273 { MCMEMBER_REC_FIELD(packet_life_time), 274 .offset_words = 10, 275 .offset_bits = 26, 276 .size_bits = 6 }, 277 { MCMEMBER_REC_FIELD(sl), 278 .offset_words = 11, 279 .offset_bits = 0, 280 .size_bits = 4 }, 281 { MCMEMBER_REC_FIELD(flow_label), 282 .offset_words = 11, 283 .offset_bits = 4, 284 .size_bits = 20 }, 285 { MCMEMBER_REC_FIELD(hop_limit), 286 .offset_words = 11, 287 .offset_bits = 24, 288 .size_bits = 8 }, 289 { MCMEMBER_REC_FIELD(scope), 290 .offset_words = 12, 291 .offset_bits = 0, 292 .size_bits = 4 }, 293 { MCMEMBER_REC_FIELD(join_state), 294 .offset_words = 12, 295 .offset_bits = 4, 296 .size_bits = 4 }, 297 { MCMEMBER_REC_FIELD(proxy_join), 298 .offset_words = 12, 299 .offset_bits = 8, 300 .size_bits = 1 }, 301 { RESERVED, 302 .offset_words = 12, 303 .offset_bits = 9, 304 .size_bits = 23 }, 305 }; 306 307 #define SERVICE_REC_FIELD(field) \ 308 .struct_offset_bytes = offsetof(struct ib_sa_service_rec, field), \ 309 .struct_size_bytes = sizeof ((struct ib_sa_service_rec *) 0)->field, \ 310 .field_name = "sa_service_rec:" #field 311 312 static const struct ib_field service_rec_table[] = { 313 { SERVICE_REC_FIELD(id), 314 .offset_words = 0, 315 .offset_bits = 0, 316 .size_bits = 64 }, 317 { SERVICE_REC_FIELD(gid), 318 .offset_words = 2, 319 .offset_bits = 0, 320 .size_bits = 128 }, 321 { SERVICE_REC_FIELD(pkey), 322 .offset_words = 6, 323 .offset_bits = 0, 324 .size_bits = 16 }, 325 { SERVICE_REC_FIELD(lease), 326 .offset_words = 7, 327 .offset_bits = 0, 328 .size_bits = 32 }, 329 { SERVICE_REC_FIELD(key), 330 .offset_words = 8, 331 .offset_bits = 0, 332 .size_bits = 128 }, 333 { SERVICE_REC_FIELD(name), 334 .offset_words = 12, 335 .offset_bits = 0, 336 .size_bits = 64*8 }, 337 { SERVICE_REC_FIELD(data8), 338 .offset_words = 28, 339 .offset_bits = 0, 340 .size_bits = 16*8 }, 341 { SERVICE_REC_FIELD(data16), 342 .offset_words = 32, 343 .offset_bits = 0, 344 .size_bits = 8*16 }, 345 { SERVICE_REC_FIELD(data32), 346 .offset_words = 36, 347 .offset_bits = 0, 348 .size_bits = 4*32 }, 349 { SERVICE_REC_FIELD(data64), 350 .offset_words = 40, 351 .offset_bits = 0, 352 .size_bits = 2*64 }, 353 }; 354 355 static void free_sm_ah(struct kref *kref) 356 { 357 struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref); 358 359 ib_destroy_ah(sm_ah->ah); 360 kfree(sm_ah); 361 } 362 363 static void update_sm_ah(struct work_struct *work) 364 { 365 struct ib_sa_port *port = 366 container_of(work, struct ib_sa_port, update_task); 367 struct ib_sa_sm_ah *new_ah, *old_ah; 368 struct ib_port_attr port_attr; 369 struct ib_ah_attr ah_attr; 370 371 if (ib_query_port(port->agent->device, port->port_num, &port_attr)) { 372 printk(KERN_WARNING "Couldn't query port\n"); 373 return; 374 } 375 376 new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL); 377 if (!new_ah) { 378 printk(KERN_WARNING "Couldn't allocate new SM AH\n"); 379 return; 380 } 381 382 kref_init(&new_ah->ref); 383 384 memset(&ah_attr, 0, sizeof ah_attr); 385 ah_attr.dlid = port_attr.sm_lid; 386 ah_attr.sl = port_attr.sm_sl; 387 ah_attr.port_num = port->port_num; 388 389 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr); 390 if (IS_ERR(new_ah->ah)) { 391 printk(KERN_WARNING "Couldn't create new SM AH\n"); 392 kfree(new_ah); 393 return; 394 } 395 396 spin_lock_irq(&port->ah_lock); 397 old_ah = port->sm_ah; 398 port->sm_ah = new_ah; 399 spin_unlock_irq(&port->ah_lock); 400 401 if (old_ah) 402 kref_put(&old_ah->ref, free_sm_ah); 403 } 404 405 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event) 406 { 407 if (event->event == IB_EVENT_PORT_ERR || 408 event->event == IB_EVENT_PORT_ACTIVE || 409 event->event == IB_EVENT_LID_CHANGE || 410 event->event == IB_EVENT_PKEY_CHANGE || 411 event->event == IB_EVENT_SM_CHANGE || 412 event->event == IB_EVENT_CLIENT_REREGISTER) { 413 struct ib_sa_device *sa_dev; 414 sa_dev = container_of(handler, typeof(*sa_dev), event_handler); 415 416 schedule_work(&sa_dev->port[event->element.port_num - 417 sa_dev->start_port].update_task); 418 } 419 } 420 421 void ib_sa_register_client(struct ib_sa_client *client) 422 { 423 atomic_set(&client->users, 1); 424 init_completion(&client->comp); 425 } 426 EXPORT_SYMBOL(ib_sa_register_client); 427 428 void ib_sa_unregister_client(struct ib_sa_client *client) 429 { 430 ib_sa_client_put(client); 431 wait_for_completion(&client->comp); 432 } 433 EXPORT_SYMBOL(ib_sa_unregister_client); 434 435 /** 436 * ib_sa_cancel_query - try to cancel an SA query 437 * @id:ID of query to cancel 438 * @query:query pointer to cancel 439 * 440 * Try to cancel an SA query. If the id and query don't match up or 441 * the query has already completed, nothing is done. Otherwise the 442 * query is canceled and will complete with a status of -EINTR. 443 */ 444 void ib_sa_cancel_query(int id, struct ib_sa_query *query) 445 { 446 unsigned long flags; 447 struct ib_mad_agent *agent; 448 struct ib_mad_send_buf *mad_buf; 449 450 spin_lock_irqsave(&idr_lock, flags); 451 if (idr_find(&query_idr, id) != query) { 452 spin_unlock_irqrestore(&idr_lock, flags); 453 return; 454 } 455 agent = query->port->agent; 456 mad_buf = query->mad_buf; 457 spin_unlock_irqrestore(&idr_lock, flags); 458 459 ib_cancel_mad(agent, mad_buf); 460 } 461 EXPORT_SYMBOL(ib_sa_cancel_query); 462 463 int ib_init_ah_from_path(struct ib_device *device, u8 port_num, 464 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr) 465 { 466 int ret; 467 u16 gid_index; 468 469 memset(ah_attr, 0, sizeof *ah_attr); 470 ah_attr->dlid = be16_to_cpu(rec->dlid); 471 ah_attr->sl = rec->sl; 472 ah_attr->src_path_bits = be16_to_cpu(rec->slid) & 0x7f; 473 ah_attr->port_num = port_num; 474 ah_attr->static_rate = rec->rate; 475 476 if (rec->hop_limit > 1) { 477 ah_attr->ah_flags = IB_AH_GRH; 478 ah_attr->grh.dgid = rec->dgid; 479 480 ret = ib_find_cached_gid(device, &rec->sgid, &port_num, 481 &gid_index); 482 if (ret) 483 return ret; 484 485 ah_attr->grh.sgid_index = gid_index; 486 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label); 487 ah_attr->grh.hop_limit = rec->hop_limit; 488 ah_attr->grh.traffic_class = rec->traffic_class; 489 } 490 return 0; 491 } 492 EXPORT_SYMBOL(ib_init_ah_from_path); 493 494 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent) 495 { 496 unsigned long flags; 497 498 memset(mad, 0, sizeof *mad); 499 500 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION; 501 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM; 502 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION; 503 504 spin_lock_irqsave(&tid_lock, flags); 505 mad->mad_hdr.tid = 506 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++); 507 spin_unlock_irqrestore(&tid_lock, flags); 508 } 509 510 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask) 511 { 512 unsigned long flags; 513 int ret, id; 514 515 retry: 516 if (!idr_pre_get(&query_idr, gfp_mask)) 517 return -ENOMEM; 518 spin_lock_irqsave(&idr_lock, flags); 519 ret = idr_get_new(&query_idr, query, &id); 520 spin_unlock_irqrestore(&idr_lock, flags); 521 if (ret == -EAGAIN) 522 goto retry; 523 if (ret) 524 return ret; 525 526 query->mad_buf->timeout_ms = timeout_ms; 527 query->mad_buf->context[0] = query; 528 query->id = id; 529 530 spin_lock_irqsave(&query->port->ah_lock, flags); 531 kref_get(&query->port->sm_ah->ref); 532 query->sm_ah = query->port->sm_ah; 533 spin_unlock_irqrestore(&query->port->ah_lock, flags); 534 535 query->mad_buf->ah = query->sm_ah->ah; 536 537 ret = ib_post_send_mad(query->mad_buf, NULL); 538 if (ret) { 539 spin_lock_irqsave(&idr_lock, flags); 540 idr_remove(&query_idr, id); 541 spin_unlock_irqrestore(&idr_lock, flags); 542 543 kref_put(&query->sm_ah->ref, free_sm_ah); 544 } 545 546 /* 547 * It's not safe to dereference query any more, because the 548 * send may already have completed and freed the query in 549 * another context. 550 */ 551 return ret ? ret : id; 552 } 553 554 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query, 555 int status, 556 struct ib_sa_mad *mad) 557 { 558 struct ib_sa_path_query *query = 559 container_of(sa_query, struct ib_sa_path_query, sa_query); 560 561 if (mad) { 562 struct ib_sa_path_rec rec; 563 564 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), 565 mad->data, &rec); 566 query->callback(status, &rec, query->context); 567 } else 568 query->callback(status, NULL, query->context); 569 } 570 571 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query) 572 { 573 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query)); 574 } 575 576 /** 577 * ib_sa_path_rec_get - Start a Path get query 578 * @client:SA client 579 * @device:device to send query on 580 * @port_num: port number to send query on 581 * @rec:Path Record to send in query 582 * @comp_mask:component mask to send in query 583 * @timeout_ms:time to wait for response 584 * @gfp_mask:GFP mask to use for internal allocations 585 * @callback:function called when query completes, times out or is 586 * canceled 587 * @context:opaque user context passed to callback 588 * @sa_query:query context, used to cancel query 589 * 590 * Send a Path Record Get query to the SA to look up a path. The 591 * callback function will be called when the query completes (or 592 * fails); status is 0 for a successful response, -EINTR if the query 593 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error 594 * occurred sending the query. The resp parameter of the callback is 595 * only valid if status is 0. 596 * 597 * If the return value of ib_sa_path_rec_get() is negative, it is an 598 * error code. Otherwise it is a query ID that can be used to cancel 599 * the query. 600 */ 601 int ib_sa_path_rec_get(struct ib_sa_client *client, 602 struct ib_device *device, u8 port_num, 603 struct ib_sa_path_rec *rec, 604 ib_sa_comp_mask comp_mask, 605 int timeout_ms, gfp_t gfp_mask, 606 void (*callback)(int status, 607 struct ib_sa_path_rec *resp, 608 void *context), 609 void *context, 610 struct ib_sa_query **sa_query) 611 { 612 struct ib_sa_path_query *query; 613 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 614 struct ib_sa_port *port; 615 struct ib_mad_agent *agent; 616 struct ib_sa_mad *mad; 617 int ret; 618 619 if (!sa_dev) 620 return -ENODEV; 621 622 port = &sa_dev->port[port_num - sa_dev->start_port]; 623 agent = port->agent; 624 625 query = kmalloc(sizeof *query, gfp_mask); 626 if (!query) 627 return -ENOMEM; 628 629 query->sa_query.mad_buf = ib_create_send_mad(agent, 1, 0, 630 0, IB_MGMT_SA_HDR, 631 IB_MGMT_SA_DATA, gfp_mask); 632 if (!query->sa_query.mad_buf) { 633 ret = -ENOMEM; 634 goto err1; 635 } 636 637 ib_sa_client_get(client); 638 query->sa_query.client = client; 639 query->callback = callback; 640 query->context = context; 641 642 mad = query->sa_query.mad_buf->mad; 643 init_mad(mad, agent); 644 645 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL; 646 query->sa_query.release = ib_sa_path_rec_release; 647 query->sa_query.port = port; 648 mad->mad_hdr.method = IB_MGMT_METHOD_GET; 649 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC); 650 mad->sa_hdr.comp_mask = comp_mask; 651 652 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data); 653 654 *sa_query = &query->sa_query; 655 656 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 657 if (ret < 0) 658 goto err2; 659 660 return ret; 661 662 err2: 663 *sa_query = NULL; 664 ib_sa_client_put(query->sa_query.client); 665 ib_free_send_mad(query->sa_query.mad_buf); 666 667 err1: 668 kfree(query); 669 return ret; 670 } 671 EXPORT_SYMBOL(ib_sa_path_rec_get); 672 673 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query, 674 int status, 675 struct ib_sa_mad *mad) 676 { 677 struct ib_sa_service_query *query = 678 container_of(sa_query, struct ib_sa_service_query, sa_query); 679 680 if (mad) { 681 struct ib_sa_service_rec rec; 682 683 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table), 684 mad->data, &rec); 685 query->callback(status, &rec, query->context); 686 } else 687 query->callback(status, NULL, query->context); 688 } 689 690 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query) 691 { 692 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query)); 693 } 694 695 /** 696 * ib_sa_service_rec_query - Start Service Record operation 697 * @client:SA client 698 * @device:device to send request on 699 * @port_num: port number to send request on 700 * @method:SA method - should be get, set, or delete 701 * @rec:Service Record to send in request 702 * @comp_mask:component mask to send in request 703 * @timeout_ms:time to wait for response 704 * @gfp_mask:GFP mask to use for internal allocations 705 * @callback:function called when request completes, times out or is 706 * canceled 707 * @context:opaque user context passed to callback 708 * @sa_query:request context, used to cancel request 709 * 710 * Send a Service Record set/get/delete to the SA to register, 711 * unregister or query a service record. 712 * The callback function will be called when the request completes (or 713 * fails); status is 0 for a successful response, -EINTR if the query 714 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error 715 * occurred sending the query. The resp parameter of the callback is 716 * only valid if status is 0. 717 * 718 * If the return value of ib_sa_service_rec_query() is negative, it is an 719 * error code. Otherwise it is a request ID that can be used to cancel 720 * the query. 721 */ 722 int ib_sa_service_rec_query(struct ib_sa_client *client, 723 struct ib_device *device, u8 port_num, u8 method, 724 struct ib_sa_service_rec *rec, 725 ib_sa_comp_mask comp_mask, 726 int timeout_ms, gfp_t gfp_mask, 727 void (*callback)(int status, 728 struct ib_sa_service_rec *resp, 729 void *context), 730 void *context, 731 struct ib_sa_query **sa_query) 732 { 733 struct ib_sa_service_query *query; 734 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 735 struct ib_sa_port *port; 736 struct ib_mad_agent *agent; 737 struct ib_sa_mad *mad; 738 int ret; 739 740 if (!sa_dev) 741 return -ENODEV; 742 743 port = &sa_dev->port[port_num - sa_dev->start_port]; 744 agent = port->agent; 745 746 if (method != IB_MGMT_METHOD_GET && 747 method != IB_MGMT_METHOD_SET && 748 method != IB_SA_METHOD_DELETE) 749 return -EINVAL; 750 751 query = kmalloc(sizeof *query, gfp_mask); 752 if (!query) 753 return -ENOMEM; 754 755 query->sa_query.mad_buf = ib_create_send_mad(agent, 1, 0, 756 0, IB_MGMT_SA_HDR, 757 IB_MGMT_SA_DATA, gfp_mask); 758 if (!query->sa_query.mad_buf) { 759 ret = -ENOMEM; 760 goto err1; 761 } 762 763 ib_sa_client_get(client); 764 query->sa_query.client = client; 765 query->callback = callback; 766 query->context = context; 767 768 mad = query->sa_query.mad_buf->mad; 769 init_mad(mad, agent); 770 771 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL; 772 query->sa_query.release = ib_sa_service_rec_release; 773 query->sa_query.port = port; 774 mad->mad_hdr.method = method; 775 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC); 776 mad->sa_hdr.comp_mask = comp_mask; 777 778 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table), 779 rec, mad->data); 780 781 *sa_query = &query->sa_query; 782 783 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 784 if (ret < 0) 785 goto err2; 786 787 return ret; 788 789 err2: 790 *sa_query = NULL; 791 ib_sa_client_put(query->sa_query.client); 792 ib_free_send_mad(query->sa_query.mad_buf); 793 794 err1: 795 kfree(query); 796 return ret; 797 } 798 EXPORT_SYMBOL(ib_sa_service_rec_query); 799 800 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query, 801 int status, 802 struct ib_sa_mad *mad) 803 { 804 struct ib_sa_mcmember_query *query = 805 container_of(sa_query, struct ib_sa_mcmember_query, sa_query); 806 807 if (mad) { 808 struct ib_sa_mcmember_rec rec; 809 810 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table), 811 mad->data, &rec); 812 query->callback(status, &rec, query->context); 813 } else 814 query->callback(status, NULL, query->context); 815 } 816 817 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query) 818 { 819 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query)); 820 } 821 822 int ib_sa_mcmember_rec_query(struct ib_sa_client *client, 823 struct ib_device *device, u8 port_num, 824 u8 method, 825 struct ib_sa_mcmember_rec *rec, 826 ib_sa_comp_mask comp_mask, 827 int timeout_ms, gfp_t gfp_mask, 828 void (*callback)(int status, 829 struct ib_sa_mcmember_rec *resp, 830 void *context), 831 void *context, 832 struct ib_sa_query **sa_query) 833 { 834 struct ib_sa_mcmember_query *query; 835 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 836 struct ib_sa_port *port; 837 struct ib_mad_agent *agent; 838 struct ib_sa_mad *mad; 839 int ret; 840 841 if (!sa_dev) 842 return -ENODEV; 843 844 port = &sa_dev->port[port_num - sa_dev->start_port]; 845 agent = port->agent; 846 847 query = kmalloc(sizeof *query, gfp_mask); 848 if (!query) 849 return -ENOMEM; 850 851 query->sa_query.mad_buf = ib_create_send_mad(agent, 1, 0, 852 0, IB_MGMT_SA_HDR, 853 IB_MGMT_SA_DATA, gfp_mask); 854 if (!query->sa_query.mad_buf) { 855 ret = -ENOMEM; 856 goto err1; 857 } 858 859 ib_sa_client_get(client); 860 query->sa_query.client = client; 861 query->callback = callback; 862 query->context = context; 863 864 mad = query->sa_query.mad_buf->mad; 865 init_mad(mad, agent); 866 867 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL; 868 query->sa_query.release = ib_sa_mcmember_rec_release; 869 query->sa_query.port = port; 870 mad->mad_hdr.method = method; 871 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC); 872 mad->sa_hdr.comp_mask = comp_mask; 873 874 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table), 875 rec, mad->data); 876 877 *sa_query = &query->sa_query; 878 879 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 880 if (ret < 0) 881 goto err2; 882 883 return ret; 884 885 err2: 886 *sa_query = NULL; 887 ib_sa_client_put(query->sa_query.client); 888 ib_free_send_mad(query->sa_query.mad_buf); 889 890 err1: 891 kfree(query); 892 return ret; 893 } 894 895 static void send_handler(struct ib_mad_agent *agent, 896 struct ib_mad_send_wc *mad_send_wc) 897 { 898 struct ib_sa_query *query = mad_send_wc->send_buf->context[0]; 899 unsigned long flags; 900 901 if (query->callback) 902 switch (mad_send_wc->status) { 903 case IB_WC_SUCCESS: 904 /* No callback -- already got recv */ 905 break; 906 case IB_WC_RESP_TIMEOUT_ERR: 907 query->callback(query, -ETIMEDOUT, NULL); 908 break; 909 case IB_WC_WR_FLUSH_ERR: 910 query->callback(query, -EINTR, NULL); 911 break; 912 default: 913 query->callback(query, -EIO, NULL); 914 break; 915 } 916 917 spin_lock_irqsave(&idr_lock, flags); 918 idr_remove(&query_idr, query->id); 919 spin_unlock_irqrestore(&idr_lock, flags); 920 921 ib_free_send_mad(mad_send_wc->send_buf); 922 kref_put(&query->sm_ah->ref, free_sm_ah); 923 ib_sa_client_put(query->client); 924 query->release(query); 925 } 926 927 static void recv_handler(struct ib_mad_agent *mad_agent, 928 struct ib_mad_recv_wc *mad_recv_wc) 929 { 930 struct ib_sa_query *query; 931 struct ib_mad_send_buf *mad_buf; 932 933 mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id; 934 query = mad_buf->context[0]; 935 936 if (query->callback) { 937 if (mad_recv_wc->wc->status == IB_WC_SUCCESS) 938 query->callback(query, 939 mad_recv_wc->recv_buf.mad->mad_hdr.status ? 940 -EINVAL : 0, 941 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad); 942 else 943 query->callback(query, -EIO, NULL); 944 } 945 946 ib_free_recv_mad(mad_recv_wc); 947 } 948 949 static void ib_sa_add_one(struct ib_device *device) 950 { 951 struct ib_sa_device *sa_dev; 952 int s, e, i; 953 954 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 955 return; 956 957 if (device->node_type == RDMA_NODE_IB_SWITCH) 958 s = e = 0; 959 else { 960 s = 1; 961 e = device->phys_port_cnt; 962 } 963 964 sa_dev = kmalloc(sizeof *sa_dev + 965 (e - s + 1) * sizeof (struct ib_sa_port), 966 GFP_KERNEL); 967 if (!sa_dev) 968 return; 969 970 sa_dev->start_port = s; 971 sa_dev->end_port = e; 972 973 for (i = 0; i <= e - s; ++i) { 974 sa_dev->port[i].sm_ah = NULL; 975 sa_dev->port[i].port_num = i + s; 976 spin_lock_init(&sa_dev->port[i].ah_lock); 977 978 sa_dev->port[i].agent = 979 ib_register_mad_agent(device, i + s, IB_QPT_GSI, 980 NULL, 0, send_handler, 981 recv_handler, sa_dev); 982 if (IS_ERR(sa_dev->port[i].agent)) 983 goto err; 984 985 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah); 986 } 987 988 ib_set_client_data(device, &sa_client, sa_dev); 989 990 /* 991 * We register our event handler after everything is set up, 992 * and then update our cached info after the event handler is 993 * registered to avoid any problems if a port changes state 994 * during our initialization. 995 */ 996 997 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event); 998 if (ib_register_event_handler(&sa_dev->event_handler)) 999 goto err; 1000 1001 for (i = 0; i <= e - s; ++i) 1002 update_sm_ah(&sa_dev->port[i].update_task); 1003 1004 return; 1005 1006 err: 1007 while (--i >= 0) 1008 ib_unregister_mad_agent(sa_dev->port[i].agent); 1009 1010 kfree(sa_dev); 1011 1012 return; 1013 } 1014 1015 static void ib_sa_remove_one(struct ib_device *device) 1016 { 1017 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 1018 int i; 1019 1020 if (!sa_dev) 1021 return; 1022 1023 ib_unregister_event_handler(&sa_dev->event_handler); 1024 1025 flush_scheduled_work(); 1026 1027 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) { 1028 ib_unregister_mad_agent(sa_dev->port[i].agent); 1029 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah); 1030 } 1031 1032 kfree(sa_dev); 1033 } 1034 1035 static int __init ib_sa_init(void) 1036 { 1037 int ret; 1038 1039 spin_lock_init(&idr_lock); 1040 spin_lock_init(&tid_lock); 1041 1042 get_random_bytes(&tid, sizeof tid); 1043 1044 ret = ib_register_client(&sa_client); 1045 if (ret) { 1046 printk(KERN_ERR "Couldn't register ib_sa client\n"); 1047 goto err1; 1048 } 1049 1050 ret = mcast_init(); 1051 if (ret) { 1052 printk(KERN_ERR "Couldn't initialize multicast handling\n"); 1053 goto err2; 1054 } 1055 1056 return 0; 1057 err2: 1058 ib_unregister_client(&sa_client); 1059 err1: 1060 return ret; 1061 } 1062 1063 static void __exit ib_sa_cleanup(void) 1064 { 1065 mcast_cleanup(); 1066 ib_unregister_client(&sa_client); 1067 idr_destroy(&query_idr); 1068 } 1069 1070 module_init(ib_sa_init); 1071 module_exit(ib_sa_cleanup); 1072