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/dma-mapping.h> 44 #include <linux/kref.h> 45 #include <linux/idr.h> 46 #include <linux/workqueue.h> 47 48 #include <rdma/ib_pack.h> 49 #include <rdma/ib_cache.h> 50 #include "sa.h" 51 52 MODULE_AUTHOR("Roland Dreier"); 53 MODULE_DESCRIPTION("InfiniBand subnet administration query support"); 54 MODULE_LICENSE("Dual BSD/GPL"); 55 56 struct ib_sa_sm_ah { 57 struct ib_ah *ah; 58 struct kref ref; 59 u16 pkey_index; 60 u8 src_path_mask; 61 }; 62 63 struct ib_sa_port { 64 struct ib_mad_agent *agent; 65 struct ib_sa_sm_ah *sm_ah; 66 struct work_struct update_task; 67 spinlock_t ah_lock; 68 u8 port_num; 69 }; 70 71 struct ib_sa_device { 72 int start_port, end_port; 73 struct ib_event_handler event_handler; 74 struct ib_sa_port port[0]; 75 }; 76 77 struct ib_sa_query { 78 void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *); 79 void (*release)(struct ib_sa_query *); 80 struct ib_sa_client *client; 81 struct ib_sa_port *port; 82 struct ib_mad_send_buf *mad_buf; 83 struct ib_sa_sm_ah *sm_ah; 84 int id; 85 }; 86 87 struct ib_sa_service_query { 88 void (*callback)(int, struct ib_sa_service_rec *, void *); 89 void *context; 90 struct ib_sa_query sa_query; 91 }; 92 93 struct ib_sa_path_query { 94 void (*callback)(int, struct ib_sa_path_rec *, void *); 95 void *context; 96 struct ib_sa_query sa_query; 97 }; 98 99 struct ib_sa_mcmember_query { 100 void (*callback)(int, struct ib_sa_mcmember_rec *, void *); 101 void *context; 102 struct ib_sa_query sa_query; 103 }; 104 105 static void ib_sa_add_one(struct ib_device *device); 106 static void ib_sa_remove_one(struct ib_device *device); 107 108 static struct ib_client sa_client = { 109 .name = "sa", 110 .add = ib_sa_add_one, 111 .remove = ib_sa_remove_one 112 }; 113 114 static spinlock_t idr_lock; 115 static DEFINE_IDR(query_idr); 116 117 static spinlock_t tid_lock; 118 static u32 tid; 119 120 #define PATH_REC_FIELD(field) \ 121 .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field), \ 122 .struct_size_bytes = sizeof ((struct ib_sa_path_rec *) 0)->field, \ 123 .field_name = "sa_path_rec:" #field 124 125 static const struct ib_field path_rec_table[] = { 126 { PATH_REC_FIELD(service_id), 127 .offset_words = 0, 128 .offset_bits = 0, 129 .size_bits = 64 }, 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 { PATH_REC_FIELD(qos_class), 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(struct work_struct *work) 361 { 362 struct ib_sa_port *port = 363 container_of(work, struct ib_sa_port, update_task); 364 struct ib_sa_sm_ah *new_ah, *old_ah; 365 struct ib_port_attr port_attr; 366 struct ib_ah_attr ah_attr; 367 368 if (ib_query_port(port->agent->device, port->port_num, &port_attr)) { 369 printk(KERN_WARNING "Couldn't query port\n"); 370 return; 371 } 372 373 new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL); 374 if (!new_ah) { 375 printk(KERN_WARNING "Couldn't allocate new SM AH\n"); 376 return; 377 } 378 379 kref_init(&new_ah->ref); 380 new_ah->src_path_mask = (1 << port_attr.lmc) - 1; 381 382 new_ah->pkey_index = 0; 383 if (ib_find_pkey(port->agent->device, port->port_num, 384 IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index)) 385 printk(KERN_ERR "Couldn't find index for default PKey\n"); 386 387 memset(&ah_attr, 0, sizeof ah_attr); 388 ah_attr.dlid = port_attr.sm_lid; 389 ah_attr.sl = port_attr.sm_sl; 390 ah_attr.port_num = port->port_num; 391 392 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr); 393 if (IS_ERR(new_ah->ah)) { 394 printk(KERN_WARNING "Couldn't create new SM AH\n"); 395 kfree(new_ah); 396 return; 397 } 398 399 spin_lock_irq(&port->ah_lock); 400 old_ah = port->sm_ah; 401 port->sm_ah = new_ah; 402 spin_unlock_irq(&port->ah_lock); 403 404 if (old_ah) 405 kref_put(&old_ah->ref, free_sm_ah); 406 } 407 408 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event) 409 { 410 if (event->event == IB_EVENT_PORT_ERR || 411 event->event == IB_EVENT_PORT_ACTIVE || 412 event->event == IB_EVENT_LID_CHANGE || 413 event->event == IB_EVENT_PKEY_CHANGE || 414 event->event == IB_EVENT_SM_CHANGE || 415 event->event == IB_EVENT_CLIENT_REREGISTER) { 416 struct ib_sa_device *sa_dev; 417 sa_dev = container_of(handler, typeof(*sa_dev), event_handler); 418 419 schedule_work(&sa_dev->port[event->element.port_num - 420 sa_dev->start_port].update_task); 421 } 422 } 423 424 void ib_sa_register_client(struct ib_sa_client *client) 425 { 426 atomic_set(&client->users, 1); 427 init_completion(&client->comp); 428 } 429 EXPORT_SYMBOL(ib_sa_register_client); 430 431 void ib_sa_unregister_client(struct ib_sa_client *client) 432 { 433 ib_sa_client_put(client); 434 wait_for_completion(&client->comp); 435 } 436 EXPORT_SYMBOL(ib_sa_unregister_client); 437 438 /** 439 * ib_sa_cancel_query - try to cancel an SA query 440 * @id:ID of query to cancel 441 * @query:query pointer to cancel 442 * 443 * Try to cancel an SA query. If the id and query don't match up or 444 * the query has already completed, nothing is done. Otherwise the 445 * query is canceled and will complete with a status of -EINTR. 446 */ 447 void ib_sa_cancel_query(int id, struct ib_sa_query *query) 448 { 449 unsigned long flags; 450 struct ib_mad_agent *agent; 451 struct ib_mad_send_buf *mad_buf; 452 453 spin_lock_irqsave(&idr_lock, flags); 454 if (idr_find(&query_idr, id) != query) { 455 spin_unlock_irqrestore(&idr_lock, flags); 456 return; 457 } 458 agent = query->port->agent; 459 mad_buf = query->mad_buf; 460 spin_unlock_irqrestore(&idr_lock, flags); 461 462 ib_cancel_mad(agent, mad_buf); 463 } 464 EXPORT_SYMBOL(ib_sa_cancel_query); 465 466 static u8 get_src_path_mask(struct ib_device *device, u8 port_num) 467 { 468 struct ib_sa_device *sa_dev; 469 struct ib_sa_port *port; 470 unsigned long flags; 471 u8 src_path_mask; 472 473 sa_dev = ib_get_client_data(device, &sa_client); 474 if (!sa_dev) 475 return 0x7f; 476 477 port = &sa_dev->port[port_num - sa_dev->start_port]; 478 spin_lock_irqsave(&port->ah_lock, flags); 479 src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f; 480 spin_unlock_irqrestore(&port->ah_lock, flags); 481 482 return src_path_mask; 483 } 484 485 int ib_init_ah_from_path(struct ib_device *device, u8 port_num, 486 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr) 487 { 488 int ret; 489 u16 gid_index; 490 491 memset(ah_attr, 0, sizeof *ah_attr); 492 ah_attr->dlid = be16_to_cpu(rec->dlid); 493 ah_attr->sl = rec->sl; 494 ah_attr->src_path_bits = be16_to_cpu(rec->slid) & 495 get_src_path_mask(device, port_num); 496 ah_attr->port_num = port_num; 497 ah_attr->static_rate = rec->rate; 498 499 if (rec->hop_limit > 1) { 500 ah_attr->ah_flags = IB_AH_GRH; 501 ah_attr->grh.dgid = rec->dgid; 502 503 ret = ib_find_cached_gid(device, &rec->sgid, &port_num, 504 &gid_index); 505 if (ret) 506 return ret; 507 508 ah_attr->grh.sgid_index = gid_index; 509 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label); 510 ah_attr->grh.hop_limit = rec->hop_limit; 511 ah_attr->grh.traffic_class = rec->traffic_class; 512 } 513 return 0; 514 } 515 EXPORT_SYMBOL(ib_init_ah_from_path); 516 517 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask) 518 { 519 unsigned long flags; 520 521 spin_lock_irqsave(&query->port->ah_lock, flags); 522 kref_get(&query->port->sm_ah->ref); 523 query->sm_ah = query->port->sm_ah; 524 spin_unlock_irqrestore(&query->port->ah_lock, flags); 525 526 query->mad_buf = ib_create_send_mad(query->port->agent, 1, 527 query->sm_ah->pkey_index, 528 0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA, 529 gfp_mask); 530 if (IS_ERR(query->mad_buf)) { 531 kref_put(&query->sm_ah->ref, free_sm_ah); 532 return -ENOMEM; 533 } 534 535 query->mad_buf->ah = query->sm_ah->ah; 536 537 return 0; 538 } 539 540 static void free_mad(struct ib_sa_query *query) 541 { 542 ib_free_send_mad(query->mad_buf); 543 kref_put(&query->sm_ah->ref, free_sm_ah); 544 } 545 546 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent) 547 { 548 unsigned long flags; 549 550 memset(mad, 0, sizeof *mad); 551 552 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION; 553 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM; 554 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION; 555 556 spin_lock_irqsave(&tid_lock, flags); 557 mad->mad_hdr.tid = 558 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++); 559 spin_unlock_irqrestore(&tid_lock, flags); 560 } 561 562 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask) 563 { 564 unsigned long flags; 565 int ret, id; 566 567 retry: 568 if (!idr_pre_get(&query_idr, gfp_mask)) 569 return -ENOMEM; 570 spin_lock_irqsave(&idr_lock, flags); 571 ret = idr_get_new(&query_idr, query, &id); 572 spin_unlock_irqrestore(&idr_lock, flags); 573 if (ret == -EAGAIN) 574 goto retry; 575 if (ret) 576 return ret; 577 578 query->mad_buf->timeout_ms = timeout_ms; 579 query->mad_buf->context[0] = query; 580 query->id = id; 581 582 ret = ib_post_send_mad(query->mad_buf, NULL); 583 if (ret) { 584 spin_lock_irqsave(&idr_lock, flags); 585 idr_remove(&query_idr, id); 586 spin_unlock_irqrestore(&idr_lock, flags); 587 } 588 589 /* 590 * It's not safe to dereference query any more, because the 591 * send may already have completed and freed the query in 592 * another context. 593 */ 594 return ret ? ret : id; 595 } 596 597 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query, 598 int status, 599 struct ib_sa_mad *mad) 600 { 601 struct ib_sa_path_query *query = 602 container_of(sa_query, struct ib_sa_path_query, sa_query); 603 604 if (mad) { 605 struct ib_sa_path_rec rec; 606 607 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), 608 mad->data, &rec); 609 query->callback(status, &rec, query->context); 610 } else 611 query->callback(status, NULL, query->context); 612 } 613 614 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query) 615 { 616 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query)); 617 } 618 619 /** 620 * ib_sa_path_rec_get - Start a Path get query 621 * @client:SA client 622 * @device:device to send query on 623 * @port_num: port number to send query on 624 * @rec:Path Record to send in query 625 * @comp_mask:component mask to send in query 626 * @timeout_ms:time to wait for response 627 * @gfp_mask:GFP mask to use for internal allocations 628 * @callback:function called when query completes, times out or is 629 * canceled 630 * @context:opaque user context passed to callback 631 * @sa_query:query context, used to cancel query 632 * 633 * Send a Path Record Get query to the SA to look up a path. The 634 * callback function will be called when the query completes (or 635 * fails); status is 0 for a successful response, -EINTR if the query 636 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error 637 * occurred sending the query. The resp parameter of the callback is 638 * only valid if status is 0. 639 * 640 * If the return value of ib_sa_path_rec_get() is negative, it is an 641 * error code. Otherwise it is a query ID that can be used to cancel 642 * the query. 643 */ 644 int ib_sa_path_rec_get(struct ib_sa_client *client, 645 struct ib_device *device, u8 port_num, 646 struct ib_sa_path_rec *rec, 647 ib_sa_comp_mask comp_mask, 648 int timeout_ms, gfp_t gfp_mask, 649 void (*callback)(int status, 650 struct ib_sa_path_rec *resp, 651 void *context), 652 void *context, 653 struct ib_sa_query **sa_query) 654 { 655 struct ib_sa_path_query *query; 656 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 657 struct ib_sa_port *port; 658 struct ib_mad_agent *agent; 659 struct ib_sa_mad *mad; 660 int ret; 661 662 if (!sa_dev) 663 return -ENODEV; 664 665 port = &sa_dev->port[port_num - sa_dev->start_port]; 666 agent = port->agent; 667 668 query = kmalloc(sizeof *query, gfp_mask); 669 if (!query) 670 return -ENOMEM; 671 672 query->sa_query.port = port; 673 ret = alloc_mad(&query->sa_query, gfp_mask); 674 if (ret) 675 goto err1; 676 677 ib_sa_client_get(client); 678 query->sa_query.client = client; 679 query->callback = callback; 680 query->context = context; 681 682 mad = query->sa_query.mad_buf->mad; 683 init_mad(mad, agent); 684 685 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL; 686 query->sa_query.release = ib_sa_path_rec_release; 687 mad->mad_hdr.method = IB_MGMT_METHOD_GET; 688 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC); 689 mad->sa_hdr.comp_mask = comp_mask; 690 691 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data); 692 693 *sa_query = &query->sa_query; 694 695 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 696 if (ret < 0) 697 goto err2; 698 699 return ret; 700 701 err2: 702 *sa_query = NULL; 703 ib_sa_client_put(query->sa_query.client); 704 free_mad(&query->sa_query); 705 706 err1: 707 kfree(query); 708 return ret; 709 } 710 EXPORT_SYMBOL(ib_sa_path_rec_get); 711 712 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query, 713 int status, 714 struct ib_sa_mad *mad) 715 { 716 struct ib_sa_service_query *query = 717 container_of(sa_query, struct ib_sa_service_query, sa_query); 718 719 if (mad) { 720 struct ib_sa_service_rec rec; 721 722 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table), 723 mad->data, &rec); 724 query->callback(status, &rec, query->context); 725 } else 726 query->callback(status, NULL, query->context); 727 } 728 729 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query) 730 { 731 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query)); 732 } 733 734 /** 735 * ib_sa_service_rec_query - Start Service Record operation 736 * @client:SA client 737 * @device:device to send request on 738 * @port_num: port number to send request on 739 * @method:SA method - should be get, set, or delete 740 * @rec:Service Record to send in request 741 * @comp_mask:component mask to send in request 742 * @timeout_ms:time to wait for response 743 * @gfp_mask:GFP mask to use for internal allocations 744 * @callback:function called when request completes, times out or is 745 * canceled 746 * @context:opaque user context passed to callback 747 * @sa_query:request context, used to cancel request 748 * 749 * Send a Service Record set/get/delete to the SA to register, 750 * unregister or query a service record. 751 * The callback function will be called when the request completes (or 752 * fails); status is 0 for a successful response, -EINTR if the query 753 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error 754 * occurred sending the query. The resp parameter of the callback is 755 * only valid if status is 0. 756 * 757 * If the return value of ib_sa_service_rec_query() is negative, it is an 758 * error code. Otherwise it is a request ID that can be used to cancel 759 * the query. 760 */ 761 int ib_sa_service_rec_query(struct ib_sa_client *client, 762 struct ib_device *device, u8 port_num, u8 method, 763 struct ib_sa_service_rec *rec, 764 ib_sa_comp_mask comp_mask, 765 int timeout_ms, gfp_t gfp_mask, 766 void (*callback)(int status, 767 struct ib_sa_service_rec *resp, 768 void *context), 769 void *context, 770 struct ib_sa_query **sa_query) 771 { 772 struct ib_sa_service_query *query; 773 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 774 struct ib_sa_port *port; 775 struct ib_mad_agent *agent; 776 struct ib_sa_mad *mad; 777 int ret; 778 779 if (!sa_dev) 780 return -ENODEV; 781 782 port = &sa_dev->port[port_num - sa_dev->start_port]; 783 agent = port->agent; 784 785 if (method != IB_MGMT_METHOD_GET && 786 method != IB_MGMT_METHOD_SET && 787 method != IB_SA_METHOD_DELETE) 788 return -EINVAL; 789 790 query = kmalloc(sizeof *query, gfp_mask); 791 if (!query) 792 return -ENOMEM; 793 794 query->sa_query.port = port; 795 ret = alloc_mad(&query->sa_query, gfp_mask); 796 if (ret) 797 goto err1; 798 799 ib_sa_client_get(client); 800 query->sa_query.client = client; 801 query->callback = callback; 802 query->context = context; 803 804 mad = query->sa_query.mad_buf->mad; 805 init_mad(mad, agent); 806 807 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL; 808 query->sa_query.release = ib_sa_service_rec_release; 809 mad->mad_hdr.method = method; 810 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC); 811 mad->sa_hdr.comp_mask = comp_mask; 812 813 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table), 814 rec, mad->data); 815 816 *sa_query = &query->sa_query; 817 818 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 819 if (ret < 0) 820 goto err2; 821 822 return ret; 823 824 err2: 825 *sa_query = NULL; 826 ib_sa_client_put(query->sa_query.client); 827 free_mad(&query->sa_query); 828 829 err1: 830 kfree(query); 831 return ret; 832 } 833 EXPORT_SYMBOL(ib_sa_service_rec_query); 834 835 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query, 836 int status, 837 struct ib_sa_mad *mad) 838 { 839 struct ib_sa_mcmember_query *query = 840 container_of(sa_query, struct ib_sa_mcmember_query, sa_query); 841 842 if (mad) { 843 struct ib_sa_mcmember_rec rec; 844 845 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table), 846 mad->data, &rec); 847 query->callback(status, &rec, query->context); 848 } else 849 query->callback(status, NULL, query->context); 850 } 851 852 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query) 853 { 854 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query)); 855 } 856 857 int ib_sa_mcmember_rec_query(struct ib_sa_client *client, 858 struct ib_device *device, u8 port_num, 859 u8 method, 860 struct ib_sa_mcmember_rec *rec, 861 ib_sa_comp_mask comp_mask, 862 int timeout_ms, gfp_t gfp_mask, 863 void (*callback)(int status, 864 struct ib_sa_mcmember_rec *resp, 865 void *context), 866 void *context, 867 struct ib_sa_query **sa_query) 868 { 869 struct ib_sa_mcmember_query *query; 870 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 871 struct ib_sa_port *port; 872 struct ib_mad_agent *agent; 873 struct ib_sa_mad *mad; 874 int ret; 875 876 if (!sa_dev) 877 return -ENODEV; 878 879 port = &sa_dev->port[port_num - sa_dev->start_port]; 880 agent = port->agent; 881 882 query = kmalloc(sizeof *query, gfp_mask); 883 if (!query) 884 return -ENOMEM; 885 886 query->sa_query.port = port; 887 ret = alloc_mad(&query->sa_query, gfp_mask); 888 if (ret) 889 goto err1; 890 891 ib_sa_client_get(client); 892 query->sa_query.client = client; 893 query->callback = callback; 894 query->context = context; 895 896 mad = query->sa_query.mad_buf->mad; 897 init_mad(mad, agent); 898 899 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL; 900 query->sa_query.release = ib_sa_mcmember_rec_release; 901 mad->mad_hdr.method = method; 902 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC); 903 mad->sa_hdr.comp_mask = comp_mask; 904 905 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table), 906 rec, mad->data); 907 908 *sa_query = &query->sa_query; 909 910 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 911 if (ret < 0) 912 goto err2; 913 914 return ret; 915 916 err2: 917 *sa_query = NULL; 918 ib_sa_client_put(query->sa_query.client); 919 free_mad(&query->sa_query); 920 921 err1: 922 kfree(query); 923 return ret; 924 } 925 926 static void send_handler(struct ib_mad_agent *agent, 927 struct ib_mad_send_wc *mad_send_wc) 928 { 929 struct ib_sa_query *query = mad_send_wc->send_buf->context[0]; 930 unsigned long flags; 931 932 if (query->callback) 933 switch (mad_send_wc->status) { 934 case IB_WC_SUCCESS: 935 /* No callback -- already got recv */ 936 break; 937 case IB_WC_RESP_TIMEOUT_ERR: 938 query->callback(query, -ETIMEDOUT, NULL); 939 break; 940 case IB_WC_WR_FLUSH_ERR: 941 query->callback(query, -EINTR, NULL); 942 break; 943 default: 944 query->callback(query, -EIO, NULL); 945 break; 946 } 947 948 spin_lock_irqsave(&idr_lock, flags); 949 idr_remove(&query_idr, query->id); 950 spin_unlock_irqrestore(&idr_lock, flags); 951 952 free_mad(query); 953 ib_sa_client_put(query->client); 954 query->release(query); 955 } 956 957 static void recv_handler(struct ib_mad_agent *mad_agent, 958 struct ib_mad_recv_wc *mad_recv_wc) 959 { 960 struct ib_sa_query *query; 961 struct ib_mad_send_buf *mad_buf; 962 963 mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id; 964 query = mad_buf->context[0]; 965 966 if (query->callback) { 967 if (mad_recv_wc->wc->status == IB_WC_SUCCESS) 968 query->callback(query, 969 mad_recv_wc->recv_buf.mad->mad_hdr.status ? 970 -EINVAL : 0, 971 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad); 972 else 973 query->callback(query, -EIO, NULL); 974 } 975 976 ib_free_recv_mad(mad_recv_wc); 977 } 978 979 static void ib_sa_add_one(struct ib_device *device) 980 { 981 struct ib_sa_device *sa_dev; 982 int s, e, i; 983 984 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 985 return; 986 987 if (device->node_type == RDMA_NODE_IB_SWITCH) 988 s = e = 0; 989 else { 990 s = 1; 991 e = device->phys_port_cnt; 992 } 993 994 sa_dev = kmalloc(sizeof *sa_dev + 995 (e - s + 1) * sizeof (struct ib_sa_port), 996 GFP_KERNEL); 997 if (!sa_dev) 998 return; 999 1000 sa_dev->start_port = s; 1001 sa_dev->end_port = e; 1002 1003 for (i = 0; i <= e - s; ++i) { 1004 sa_dev->port[i].sm_ah = NULL; 1005 sa_dev->port[i].port_num = i + s; 1006 spin_lock_init(&sa_dev->port[i].ah_lock); 1007 1008 sa_dev->port[i].agent = 1009 ib_register_mad_agent(device, i + s, IB_QPT_GSI, 1010 NULL, 0, send_handler, 1011 recv_handler, sa_dev); 1012 if (IS_ERR(sa_dev->port[i].agent)) 1013 goto err; 1014 1015 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah); 1016 } 1017 1018 ib_set_client_data(device, &sa_client, sa_dev); 1019 1020 /* 1021 * We register our event handler after everything is set up, 1022 * and then update our cached info after the event handler is 1023 * registered to avoid any problems if a port changes state 1024 * during our initialization. 1025 */ 1026 1027 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event); 1028 if (ib_register_event_handler(&sa_dev->event_handler)) 1029 goto err; 1030 1031 for (i = 0; i <= e - s; ++i) 1032 update_sm_ah(&sa_dev->port[i].update_task); 1033 1034 return; 1035 1036 err: 1037 while (--i >= 0) 1038 ib_unregister_mad_agent(sa_dev->port[i].agent); 1039 1040 kfree(sa_dev); 1041 1042 return; 1043 } 1044 1045 static void ib_sa_remove_one(struct ib_device *device) 1046 { 1047 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 1048 int i; 1049 1050 if (!sa_dev) 1051 return; 1052 1053 ib_unregister_event_handler(&sa_dev->event_handler); 1054 1055 flush_scheduled_work(); 1056 1057 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) { 1058 ib_unregister_mad_agent(sa_dev->port[i].agent); 1059 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah); 1060 } 1061 1062 kfree(sa_dev); 1063 } 1064 1065 static int __init ib_sa_init(void) 1066 { 1067 int ret; 1068 1069 spin_lock_init(&idr_lock); 1070 spin_lock_init(&tid_lock); 1071 1072 get_random_bytes(&tid, sizeof tid); 1073 1074 ret = ib_register_client(&sa_client); 1075 if (ret) { 1076 printk(KERN_ERR "Couldn't register ib_sa client\n"); 1077 goto err1; 1078 } 1079 1080 ret = mcast_init(); 1081 if (ret) { 1082 printk(KERN_ERR "Couldn't initialize multicast handling\n"); 1083 goto err2; 1084 } 1085 1086 return 0; 1087 err2: 1088 ib_unregister_client(&sa_client); 1089 err1: 1090 return ret; 1091 } 1092 1093 static void __exit ib_sa_cleanup(void) 1094 { 1095 mcast_cleanup(); 1096 ib_unregister_client(&sa_client); 1097 idr_destroy(&query_idr); 1098 } 1099 1100 module_init(ib_sa_init); 1101 module_exit(ib_sa_cleanup); 1102