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 35 #include <linux/module.h> 36 #include <linux/init.h> 37 #include <linux/err.h> 38 #include <linux/random.h> 39 #include <linux/spinlock.h> 40 #include <linux/slab.h> 41 #include <linux/dma-mapping.h> 42 #include <linux/kref.h> 43 #include <linux/idr.h> 44 #include <linux/workqueue.h> 45 46 #include <rdma/ib_pack.h> 47 #include <rdma/ib_cache.h> 48 #include "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 u16 pkey_index; 58 u8 src_path_mask; 59 }; 60 61 struct ib_sa_port { 62 struct ib_mad_agent *agent; 63 struct ib_sa_sm_ah *sm_ah; 64 struct work_struct update_task; 65 spinlock_t ah_lock; 66 u8 port_num; 67 }; 68 69 struct ib_sa_device { 70 int start_port, end_port; 71 struct ib_event_handler event_handler; 72 struct ib_sa_port port[0]; 73 }; 74 75 struct ib_sa_query { 76 void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *); 77 void (*release)(struct ib_sa_query *); 78 struct ib_sa_client *client; 79 struct ib_sa_port *port; 80 struct ib_mad_send_buf *mad_buf; 81 struct ib_sa_sm_ah *sm_ah; 82 int id; 83 }; 84 85 struct ib_sa_service_query { 86 void (*callback)(int, struct ib_sa_service_rec *, void *); 87 void *context; 88 struct ib_sa_query sa_query; 89 }; 90 91 struct ib_sa_path_query { 92 void (*callback)(int, struct ib_sa_path_rec *, void *); 93 void *context; 94 struct ib_sa_query sa_query; 95 }; 96 97 struct ib_sa_mcmember_query { 98 void (*callback)(int, struct ib_sa_mcmember_rec *, void *); 99 void *context; 100 struct ib_sa_query sa_query; 101 }; 102 103 static void ib_sa_add_one(struct ib_device *device); 104 static void ib_sa_remove_one(struct ib_device *device); 105 106 static struct ib_client sa_client = { 107 .name = "sa", 108 .add = ib_sa_add_one, 109 .remove = ib_sa_remove_one 110 }; 111 112 static DEFINE_SPINLOCK(idr_lock); 113 static DEFINE_IDR(query_idr); 114 115 static DEFINE_SPINLOCK(tid_lock); 116 static u32 tid; 117 118 #define PATH_REC_FIELD(field) \ 119 .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field), \ 120 .struct_size_bytes = sizeof ((struct ib_sa_path_rec *) 0)->field, \ 121 .field_name = "sa_path_rec:" #field 122 123 static const struct ib_field path_rec_table[] = { 124 { PATH_REC_FIELD(service_id), 125 .offset_words = 0, 126 .offset_bits = 0, 127 .size_bits = 64 }, 128 { PATH_REC_FIELD(dgid), 129 .offset_words = 2, 130 .offset_bits = 0, 131 .size_bits = 128 }, 132 { PATH_REC_FIELD(sgid), 133 .offset_words = 6, 134 .offset_bits = 0, 135 .size_bits = 128 }, 136 { PATH_REC_FIELD(dlid), 137 .offset_words = 10, 138 .offset_bits = 0, 139 .size_bits = 16 }, 140 { PATH_REC_FIELD(slid), 141 .offset_words = 10, 142 .offset_bits = 16, 143 .size_bits = 16 }, 144 { PATH_REC_FIELD(raw_traffic), 145 .offset_words = 11, 146 .offset_bits = 0, 147 .size_bits = 1 }, 148 { RESERVED, 149 .offset_words = 11, 150 .offset_bits = 1, 151 .size_bits = 3 }, 152 { PATH_REC_FIELD(flow_label), 153 .offset_words = 11, 154 .offset_bits = 4, 155 .size_bits = 20 }, 156 { PATH_REC_FIELD(hop_limit), 157 .offset_words = 11, 158 .offset_bits = 24, 159 .size_bits = 8 }, 160 { PATH_REC_FIELD(traffic_class), 161 .offset_words = 12, 162 .offset_bits = 0, 163 .size_bits = 8 }, 164 { PATH_REC_FIELD(reversible), 165 .offset_words = 12, 166 .offset_bits = 8, 167 .size_bits = 1 }, 168 { PATH_REC_FIELD(numb_path), 169 .offset_words = 12, 170 .offset_bits = 9, 171 .size_bits = 7 }, 172 { PATH_REC_FIELD(pkey), 173 .offset_words = 12, 174 .offset_bits = 16, 175 .size_bits = 16 }, 176 { PATH_REC_FIELD(qos_class), 177 .offset_words = 13, 178 .offset_bits = 0, 179 .size_bits = 12 }, 180 { PATH_REC_FIELD(sl), 181 .offset_words = 13, 182 .offset_bits = 12, 183 .size_bits = 4 }, 184 { PATH_REC_FIELD(mtu_selector), 185 .offset_words = 13, 186 .offset_bits = 16, 187 .size_bits = 2 }, 188 { PATH_REC_FIELD(mtu), 189 .offset_words = 13, 190 .offset_bits = 18, 191 .size_bits = 6 }, 192 { PATH_REC_FIELD(rate_selector), 193 .offset_words = 13, 194 .offset_bits = 24, 195 .size_bits = 2 }, 196 { PATH_REC_FIELD(rate), 197 .offset_words = 13, 198 .offset_bits = 26, 199 .size_bits = 6 }, 200 { PATH_REC_FIELD(packet_life_time_selector), 201 .offset_words = 14, 202 .offset_bits = 0, 203 .size_bits = 2 }, 204 { PATH_REC_FIELD(packet_life_time), 205 .offset_words = 14, 206 .offset_bits = 2, 207 .size_bits = 6 }, 208 { PATH_REC_FIELD(preference), 209 .offset_words = 14, 210 .offset_bits = 8, 211 .size_bits = 8 }, 212 { RESERVED, 213 .offset_words = 14, 214 .offset_bits = 16, 215 .size_bits = 48 }, 216 }; 217 218 #define MCMEMBER_REC_FIELD(field) \ 219 .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field), \ 220 .struct_size_bytes = sizeof ((struct ib_sa_mcmember_rec *) 0)->field, \ 221 .field_name = "sa_mcmember_rec:" #field 222 223 static const struct ib_field mcmember_rec_table[] = { 224 { MCMEMBER_REC_FIELD(mgid), 225 .offset_words = 0, 226 .offset_bits = 0, 227 .size_bits = 128 }, 228 { MCMEMBER_REC_FIELD(port_gid), 229 .offset_words = 4, 230 .offset_bits = 0, 231 .size_bits = 128 }, 232 { MCMEMBER_REC_FIELD(qkey), 233 .offset_words = 8, 234 .offset_bits = 0, 235 .size_bits = 32 }, 236 { MCMEMBER_REC_FIELD(mlid), 237 .offset_words = 9, 238 .offset_bits = 0, 239 .size_bits = 16 }, 240 { MCMEMBER_REC_FIELD(mtu_selector), 241 .offset_words = 9, 242 .offset_bits = 16, 243 .size_bits = 2 }, 244 { MCMEMBER_REC_FIELD(mtu), 245 .offset_words = 9, 246 .offset_bits = 18, 247 .size_bits = 6 }, 248 { MCMEMBER_REC_FIELD(traffic_class), 249 .offset_words = 9, 250 .offset_bits = 24, 251 .size_bits = 8 }, 252 { MCMEMBER_REC_FIELD(pkey), 253 .offset_words = 10, 254 .offset_bits = 0, 255 .size_bits = 16 }, 256 { MCMEMBER_REC_FIELD(rate_selector), 257 .offset_words = 10, 258 .offset_bits = 16, 259 .size_bits = 2 }, 260 { MCMEMBER_REC_FIELD(rate), 261 .offset_words = 10, 262 .offset_bits = 18, 263 .size_bits = 6 }, 264 { MCMEMBER_REC_FIELD(packet_life_time_selector), 265 .offset_words = 10, 266 .offset_bits = 24, 267 .size_bits = 2 }, 268 { MCMEMBER_REC_FIELD(packet_life_time), 269 .offset_words = 10, 270 .offset_bits = 26, 271 .size_bits = 6 }, 272 { MCMEMBER_REC_FIELD(sl), 273 .offset_words = 11, 274 .offset_bits = 0, 275 .size_bits = 4 }, 276 { MCMEMBER_REC_FIELD(flow_label), 277 .offset_words = 11, 278 .offset_bits = 4, 279 .size_bits = 20 }, 280 { MCMEMBER_REC_FIELD(hop_limit), 281 .offset_words = 11, 282 .offset_bits = 24, 283 .size_bits = 8 }, 284 { MCMEMBER_REC_FIELD(scope), 285 .offset_words = 12, 286 .offset_bits = 0, 287 .size_bits = 4 }, 288 { MCMEMBER_REC_FIELD(join_state), 289 .offset_words = 12, 290 .offset_bits = 4, 291 .size_bits = 4 }, 292 { MCMEMBER_REC_FIELD(proxy_join), 293 .offset_words = 12, 294 .offset_bits = 8, 295 .size_bits = 1 }, 296 { RESERVED, 297 .offset_words = 12, 298 .offset_bits = 9, 299 .size_bits = 23 }, 300 }; 301 302 #define SERVICE_REC_FIELD(field) \ 303 .struct_offset_bytes = offsetof(struct ib_sa_service_rec, field), \ 304 .struct_size_bytes = sizeof ((struct ib_sa_service_rec *) 0)->field, \ 305 .field_name = "sa_service_rec:" #field 306 307 static const struct ib_field service_rec_table[] = { 308 { SERVICE_REC_FIELD(id), 309 .offset_words = 0, 310 .offset_bits = 0, 311 .size_bits = 64 }, 312 { SERVICE_REC_FIELD(gid), 313 .offset_words = 2, 314 .offset_bits = 0, 315 .size_bits = 128 }, 316 { SERVICE_REC_FIELD(pkey), 317 .offset_words = 6, 318 .offset_bits = 0, 319 .size_bits = 16 }, 320 { SERVICE_REC_FIELD(lease), 321 .offset_words = 7, 322 .offset_bits = 0, 323 .size_bits = 32 }, 324 { SERVICE_REC_FIELD(key), 325 .offset_words = 8, 326 .offset_bits = 0, 327 .size_bits = 128 }, 328 { SERVICE_REC_FIELD(name), 329 .offset_words = 12, 330 .offset_bits = 0, 331 .size_bits = 64*8 }, 332 { SERVICE_REC_FIELD(data8), 333 .offset_words = 28, 334 .offset_bits = 0, 335 .size_bits = 16*8 }, 336 { SERVICE_REC_FIELD(data16), 337 .offset_words = 32, 338 .offset_bits = 0, 339 .size_bits = 8*16 }, 340 { SERVICE_REC_FIELD(data32), 341 .offset_words = 36, 342 .offset_bits = 0, 343 .size_bits = 4*32 }, 344 { SERVICE_REC_FIELD(data64), 345 .offset_words = 40, 346 .offset_bits = 0, 347 .size_bits = 2*64 }, 348 }; 349 350 static void free_sm_ah(struct kref *kref) 351 { 352 struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref); 353 354 ib_destroy_ah(sm_ah->ah); 355 kfree(sm_ah); 356 } 357 358 static void update_sm_ah(struct work_struct *work) 359 { 360 struct ib_sa_port *port = 361 container_of(work, struct ib_sa_port, update_task); 362 struct ib_sa_sm_ah *new_ah; 363 struct ib_port_attr port_attr; 364 struct ib_ah_attr ah_attr; 365 366 if (ib_query_port(port->agent->device, port->port_num, &port_attr)) { 367 printk(KERN_WARNING "Couldn't query port\n"); 368 return; 369 } 370 371 new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL); 372 if (!new_ah) { 373 printk(KERN_WARNING "Couldn't allocate new SM AH\n"); 374 return; 375 } 376 377 kref_init(&new_ah->ref); 378 new_ah->src_path_mask = (1 << port_attr.lmc) - 1; 379 380 new_ah->pkey_index = 0; 381 if (ib_find_pkey(port->agent->device, port->port_num, 382 IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index)) 383 printk(KERN_ERR "Couldn't find index for default PKey\n"); 384 385 memset(&ah_attr, 0, sizeof ah_attr); 386 ah_attr.dlid = port_attr.sm_lid; 387 ah_attr.sl = port_attr.sm_sl; 388 ah_attr.port_num = port->port_num; 389 390 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr); 391 if (IS_ERR(new_ah->ah)) { 392 printk(KERN_WARNING "Couldn't create new SM AH\n"); 393 kfree(new_ah); 394 return; 395 } 396 397 spin_lock_irq(&port->ah_lock); 398 if (port->sm_ah) 399 kref_put(&port->sm_ah->ref, free_sm_ah); 400 port->sm_ah = new_ah; 401 spin_unlock_irq(&port->ah_lock); 402 403 } 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 unsigned long flags; 414 struct ib_sa_device *sa_dev = 415 container_of(handler, typeof(*sa_dev), event_handler); 416 struct ib_sa_port *port = 417 &sa_dev->port[event->element.port_num - sa_dev->start_port]; 418 419 if (rdma_port_get_link_layer(handler->device, port->port_num) != IB_LINK_LAYER_INFINIBAND) 420 return; 421 422 spin_lock_irqsave(&port->ah_lock, flags); 423 if (port->sm_ah) 424 kref_put(&port->sm_ah->ref, free_sm_ah); 425 port->sm_ah = NULL; 426 spin_unlock_irqrestore(&port->ah_lock, flags); 427 428 queue_work(ib_wq, &sa_dev->port[event->element.port_num - 429 sa_dev->start_port].update_task); 430 } 431 } 432 433 void ib_sa_register_client(struct ib_sa_client *client) 434 { 435 atomic_set(&client->users, 1); 436 init_completion(&client->comp); 437 } 438 EXPORT_SYMBOL(ib_sa_register_client); 439 440 void ib_sa_unregister_client(struct ib_sa_client *client) 441 { 442 ib_sa_client_put(client); 443 wait_for_completion(&client->comp); 444 } 445 EXPORT_SYMBOL(ib_sa_unregister_client); 446 447 /** 448 * ib_sa_cancel_query - try to cancel an SA query 449 * @id:ID of query to cancel 450 * @query:query pointer to cancel 451 * 452 * Try to cancel an SA query. If the id and query don't match up or 453 * the query has already completed, nothing is done. Otherwise the 454 * query is canceled and will complete with a status of -EINTR. 455 */ 456 void ib_sa_cancel_query(int id, struct ib_sa_query *query) 457 { 458 unsigned long flags; 459 struct ib_mad_agent *agent; 460 struct ib_mad_send_buf *mad_buf; 461 462 spin_lock_irqsave(&idr_lock, flags); 463 if (idr_find(&query_idr, id) != query) { 464 spin_unlock_irqrestore(&idr_lock, flags); 465 return; 466 } 467 agent = query->port->agent; 468 mad_buf = query->mad_buf; 469 spin_unlock_irqrestore(&idr_lock, flags); 470 471 ib_cancel_mad(agent, mad_buf); 472 } 473 EXPORT_SYMBOL(ib_sa_cancel_query); 474 475 static u8 get_src_path_mask(struct ib_device *device, u8 port_num) 476 { 477 struct ib_sa_device *sa_dev; 478 struct ib_sa_port *port; 479 unsigned long flags; 480 u8 src_path_mask; 481 482 sa_dev = ib_get_client_data(device, &sa_client); 483 if (!sa_dev) 484 return 0x7f; 485 486 port = &sa_dev->port[port_num - sa_dev->start_port]; 487 spin_lock_irqsave(&port->ah_lock, flags); 488 src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f; 489 spin_unlock_irqrestore(&port->ah_lock, flags); 490 491 return src_path_mask; 492 } 493 494 int ib_init_ah_from_path(struct ib_device *device, u8 port_num, 495 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr) 496 { 497 int ret; 498 u16 gid_index; 499 int force_grh; 500 501 memset(ah_attr, 0, sizeof *ah_attr); 502 ah_attr->dlid = be16_to_cpu(rec->dlid); 503 ah_attr->sl = rec->sl; 504 ah_attr->src_path_bits = be16_to_cpu(rec->slid) & 505 get_src_path_mask(device, port_num); 506 ah_attr->port_num = port_num; 507 ah_attr->static_rate = rec->rate; 508 509 force_grh = rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_ETHERNET; 510 511 if (rec->hop_limit > 1 || force_grh) { 512 ah_attr->ah_flags = IB_AH_GRH; 513 ah_attr->grh.dgid = rec->dgid; 514 515 ret = ib_find_cached_gid(device, &rec->sgid, &port_num, 516 &gid_index); 517 if (ret) 518 return ret; 519 520 ah_attr->grh.sgid_index = gid_index; 521 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label); 522 ah_attr->grh.hop_limit = rec->hop_limit; 523 ah_attr->grh.traffic_class = rec->traffic_class; 524 } 525 return 0; 526 } 527 EXPORT_SYMBOL(ib_init_ah_from_path); 528 529 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask) 530 { 531 unsigned long flags; 532 533 spin_lock_irqsave(&query->port->ah_lock, flags); 534 if (!query->port->sm_ah) { 535 spin_unlock_irqrestore(&query->port->ah_lock, flags); 536 return -EAGAIN; 537 } 538 kref_get(&query->port->sm_ah->ref); 539 query->sm_ah = query->port->sm_ah; 540 spin_unlock_irqrestore(&query->port->ah_lock, flags); 541 542 query->mad_buf = ib_create_send_mad(query->port->agent, 1, 543 query->sm_ah->pkey_index, 544 0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA, 545 gfp_mask); 546 if (IS_ERR(query->mad_buf)) { 547 kref_put(&query->sm_ah->ref, free_sm_ah); 548 return -ENOMEM; 549 } 550 551 query->mad_buf->ah = query->sm_ah->ah; 552 553 return 0; 554 } 555 556 static void free_mad(struct ib_sa_query *query) 557 { 558 ib_free_send_mad(query->mad_buf); 559 kref_put(&query->sm_ah->ref, free_sm_ah); 560 } 561 562 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent) 563 { 564 unsigned long flags; 565 566 memset(mad, 0, sizeof *mad); 567 568 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION; 569 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM; 570 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION; 571 572 spin_lock_irqsave(&tid_lock, flags); 573 mad->mad_hdr.tid = 574 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++); 575 spin_unlock_irqrestore(&tid_lock, flags); 576 } 577 578 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask) 579 { 580 unsigned long flags; 581 int ret, id; 582 583 retry: 584 if (!idr_pre_get(&query_idr, gfp_mask)) 585 return -ENOMEM; 586 spin_lock_irqsave(&idr_lock, flags); 587 ret = idr_get_new(&query_idr, query, &id); 588 spin_unlock_irqrestore(&idr_lock, flags); 589 if (ret == -EAGAIN) 590 goto retry; 591 if (ret) 592 return ret; 593 594 query->mad_buf->timeout_ms = timeout_ms; 595 query->mad_buf->context[0] = query; 596 query->id = id; 597 598 ret = ib_post_send_mad(query->mad_buf, NULL); 599 if (ret) { 600 spin_lock_irqsave(&idr_lock, flags); 601 idr_remove(&query_idr, id); 602 spin_unlock_irqrestore(&idr_lock, flags); 603 } 604 605 /* 606 * It's not safe to dereference query any more, because the 607 * send may already have completed and freed the query in 608 * another context. 609 */ 610 return ret ? ret : id; 611 } 612 613 void ib_sa_unpack_path(void *attribute, struct ib_sa_path_rec *rec) 614 { 615 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), attribute, rec); 616 } 617 EXPORT_SYMBOL(ib_sa_unpack_path); 618 619 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query, 620 int status, 621 struct ib_sa_mad *mad) 622 { 623 struct ib_sa_path_query *query = 624 container_of(sa_query, struct ib_sa_path_query, sa_query); 625 626 if (mad) { 627 struct ib_sa_path_rec rec; 628 629 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), 630 mad->data, &rec); 631 query->callback(status, &rec, query->context); 632 } else 633 query->callback(status, NULL, query->context); 634 } 635 636 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query) 637 { 638 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query)); 639 } 640 641 /** 642 * ib_sa_path_rec_get - Start a Path get query 643 * @client:SA client 644 * @device:device to send query on 645 * @port_num: port number to send query on 646 * @rec:Path Record to send in query 647 * @comp_mask:component mask to send in query 648 * @timeout_ms:time to wait for response 649 * @gfp_mask:GFP mask to use for internal allocations 650 * @callback:function called when query completes, times out or is 651 * canceled 652 * @context:opaque user context passed to callback 653 * @sa_query:query context, used to cancel query 654 * 655 * Send a Path Record Get query to the SA to look up a path. The 656 * callback function will be called when the query completes (or 657 * fails); status is 0 for a successful response, -EINTR if the query 658 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error 659 * occurred sending the query. The resp parameter of the callback is 660 * only valid if status is 0. 661 * 662 * If the return value of ib_sa_path_rec_get() is negative, it is an 663 * error code. Otherwise it is a query ID that can be used to cancel 664 * the query. 665 */ 666 int ib_sa_path_rec_get(struct ib_sa_client *client, 667 struct ib_device *device, u8 port_num, 668 struct ib_sa_path_rec *rec, 669 ib_sa_comp_mask comp_mask, 670 int timeout_ms, gfp_t gfp_mask, 671 void (*callback)(int status, 672 struct ib_sa_path_rec *resp, 673 void *context), 674 void *context, 675 struct ib_sa_query **sa_query) 676 { 677 struct ib_sa_path_query *query; 678 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 679 struct ib_sa_port *port; 680 struct ib_mad_agent *agent; 681 struct ib_sa_mad *mad; 682 int ret; 683 684 if (!sa_dev) 685 return -ENODEV; 686 687 port = &sa_dev->port[port_num - sa_dev->start_port]; 688 agent = port->agent; 689 690 query = kmalloc(sizeof *query, gfp_mask); 691 if (!query) 692 return -ENOMEM; 693 694 query->sa_query.port = port; 695 ret = alloc_mad(&query->sa_query, gfp_mask); 696 if (ret) 697 goto err1; 698 699 ib_sa_client_get(client); 700 query->sa_query.client = client; 701 query->callback = callback; 702 query->context = context; 703 704 mad = query->sa_query.mad_buf->mad; 705 init_mad(mad, agent); 706 707 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL; 708 query->sa_query.release = ib_sa_path_rec_release; 709 mad->mad_hdr.method = IB_MGMT_METHOD_GET; 710 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC); 711 mad->sa_hdr.comp_mask = comp_mask; 712 713 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data); 714 715 *sa_query = &query->sa_query; 716 717 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 718 if (ret < 0) 719 goto err2; 720 721 return ret; 722 723 err2: 724 *sa_query = NULL; 725 ib_sa_client_put(query->sa_query.client); 726 free_mad(&query->sa_query); 727 728 err1: 729 kfree(query); 730 return ret; 731 } 732 EXPORT_SYMBOL(ib_sa_path_rec_get); 733 734 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query, 735 int status, 736 struct ib_sa_mad *mad) 737 { 738 struct ib_sa_service_query *query = 739 container_of(sa_query, struct ib_sa_service_query, sa_query); 740 741 if (mad) { 742 struct ib_sa_service_rec rec; 743 744 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table), 745 mad->data, &rec); 746 query->callback(status, &rec, query->context); 747 } else 748 query->callback(status, NULL, query->context); 749 } 750 751 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query) 752 { 753 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query)); 754 } 755 756 /** 757 * ib_sa_service_rec_query - Start Service Record operation 758 * @client:SA client 759 * @device:device to send request on 760 * @port_num: port number to send request on 761 * @method:SA method - should be get, set, or delete 762 * @rec:Service Record to send in request 763 * @comp_mask:component mask to send in request 764 * @timeout_ms:time to wait for response 765 * @gfp_mask:GFP mask to use for internal allocations 766 * @callback:function called when request completes, times out or is 767 * canceled 768 * @context:opaque user context passed to callback 769 * @sa_query:request context, used to cancel request 770 * 771 * Send a Service Record set/get/delete to the SA to register, 772 * unregister or query a service record. 773 * The callback function will be called when the request completes (or 774 * fails); status is 0 for a successful response, -EINTR if the query 775 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error 776 * occurred sending the query. The resp parameter of the callback is 777 * only valid if status is 0. 778 * 779 * If the return value of ib_sa_service_rec_query() is negative, it is an 780 * error code. Otherwise it is a request ID that can be used to cancel 781 * the query. 782 */ 783 int ib_sa_service_rec_query(struct ib_sa_client *client, 784 struct ib_device *device, u8 port_num, u8 method, 785 struct ib_sa_service_rec *rec, 786 ib_sa_comp_mask comp_mask, 787 int timeout_ms, gfp_t gfp_mask, 788 void (*callback)(int status, 789 struct ib_sa_service_rec *resp, 790 void *context), 791 void *context, 792 struct ib_sa_query **sa_query) 793 { 794 struct ib_sa_service_query *query; 795 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 796 struct ib_sa_port *port; 797 struct ib_mad_agent *agent; 798 struct ib_sa_mad *mad; 799 int ret; 800 801 if (!sa_dev) 802 return -ENODEV; 803 804 port = &sa_dev->port[port_num - sa_dev->start_port]; 805 agent = port->agent; 806 807 if (method != IB_MGMT_METHOD_GET && 808 method != IB_MGMT_METHOD_SET && 809 method != IB_SA_METHOD_DELETE) 810 return -EINVAL; 811 812 query = kmalloc(sizeof *query, gfp_mask); 813 if (!query) 814 return -ENOMEM; 815 816 query->sa_query.port = port; 817 ret = alloc_mad(&query->sa_query, gfp_mask); 818 if (ret) 819 goto err1; 820 821 ib_sa_client_get(client); 822 query->sa_query.client = client; 823 query->callback = callback; 824 query->context = context; 825 826 mad = query->sa_query.mad_buf->mad; 827 init_mad(mad, agent); 828 829 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL; 830 query->sa_query.release = ib_sa_service_rec_release; 831 mad->mad_hdr.method = method; 832 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC); 833 mad->sa_hdr.comp_mask = comp_mask; 834 835 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table), 836 rec, mad->data); 837 838 *sa_query = &query->sa_query; 839 840 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 841 if (ret < 0) 842 goto err2; 843 844 return ret; 845 846 err2: 847 *sa_query = NULL; 848 ib_sa_client_put(query->sa_query.client); 849 free_mad(&query->sa_query); 850 851 err1: 852 kfree(query); 853 return ret; 854 } 855 EXPORT_SYMBOL(ib_sa_service_rec_query); 856 857 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query, 858 int status, 859 struct ib_sa_mad *mad) 860 { 861 struct ib_sa_mcmember_query *query = 862 container_of(sa_query, struct ib_sa_mcmember_query, sa_query); 863 864 if (mad) { 865 struct ib_sa_mcmember_rec rec; 866 867 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table), 868 mad->data, &rec); 869 query->callback(status, &rec, query->context); 870 } else 871 query->callback(status, NULL, query->context); 872 } 873 874 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query) 875 { 876 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query)); 877 } 878 879 int ib_sa_mcmember_rec_query(struct ib_sa_client *client, 880 struct ib_device *device, u8 port_num, 881 u8 method, 882 struct ib_sa_mcmember_rec *rec, 883 ib_sa_comp_mask comp_mask, 884 int timeout_ms, gfp_t gfp_mask, 885 void (*callback)(int status, 886 struct ib_sa_mcmember_rec *resp, 887 void *context), 888 void *context, 889 struct ib_sa_query **sa_query) 890 { 891 struct ib_sa_mcmember_query *query; 892 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 893 struct ib_sa_port *port; 894 struct ib_mad_agent *agent; 895 struct ib_sa_mad *mad; 896 int ret; 897 898 if (!sa_dev) 899 return -ENODEV; 900 901 port = &sa_dev->port[port_num - sa_dev->start_port]; 902 agent = port->agent; 903 904 query = kmalloc(sizeof *query, gfp_mask); 905 if (!query) 906 return -ENOMEM; 907 908 query->sa_query.port = port; 909 ret = alloc_mad(&query->sa_query, gfp_mask); 910 if (ret) 911 goto err1; 912 913 ib_sa_client_get(client); 914 query->sa_query.client = client; 915 query->callback = callback; 916 query->context = context; 917 918 mad = query->sa_query.mad_buf->mad; 919 init_mad(mad, agent); 920 921 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL; 922 query->sa_query.release = ib_sa_mcmember_rec_release; 923 mad->mad_hdr.method = method; 924 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC); 925 mad->sa_hdr.comp_mask = comp_mask; 926 927 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table), 928 rec, mad->data); 929 930 *sa_query = &query->sa_query; 931 932 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 933 if (ret < 0) 934 goto err2; 935 936 return ret; 937 938 err2: 939 *sa_query = NULL; 940 ib_sa_client_put(query->sa_query.client); 941 free_mad(&query->sa_query); 942 943 err1: 944 kfree(query); 945 return ret; 946 } 947 948 static void send_handler(struct ib_mad_agent *agent, 949 struct ib_mad_send_wc *mad_send_wc) 950 { 951 struct ib_sa_query *query = mad_send_wc->send_buf->context[0]; 952 unsigned long flags; 953 954 if (query->callback) 955 switch (mad_send_wc->status) { 956 case IB_WC_SUCCESS: 957 /* No callback -- already got recv */ 958 break; 959 case IB_WC_RESP_TIMEOUT_ERR: 960 query->callback(query, -ETIMEDOUT, NULL); 961 break; 962 case IB_WC_WR_FLUSH_ERR: 963 query->callback(query, -EINTR, NULL); 964 break; 965 default: 966 query->callback(query, -EIO, NULL); 967 break; 968 } 969 970 spin_lock_irqsave(&idr_lock, flags); 971 idr_remove(&query_idr, query->id); 972 spin_unlock_irqrestore(&idr_lock, flags); 973 974 free_mad(query); 975 ib_sa_client_put(query->client); 976 query->release(query); 977 } 978 979 static void recv_handler(struct ib_mad_agent *mad_agent, 980 struct ib_mad_recv_wc *mad_recv_wc) 981 { 982 struct ib_sa_query *query; 983 struct ib_mad_send_buf *mad_buf; 984 985 mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id; 986 query = mad_buf->context[0]; 987 988 if (query->callback) { 989 if (mad_recv_wc->wc->status == IB_WC_SUCCESS) 990 query->callback(query, 991 mad_recv_wc->recv_buf.mad->mad_hdr.status ? 992 -EINVAL : 0, 993 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad); 994 else 995 query->callback(query, -EIO, NULL); 996 } 997 998 ib_free_recv_mad(mad_recv_wc); 999 } 1000 1001 static void ib_sa_add_one(struct ib_device *device) 1002 { 1003 struct ib_sa_device *sa_dev; 1004 int s, e, i; 1005 1006 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 1007 return; 1008 1009 if (device->node_type == RDMA_NODE_IB_SWITCH) 1010 s = e = 0; 1011 else { 1012 s = 1; 1013 e = device->phys_port_cnt; 1014 } 1015 1016 sa_dev = kzalloc(sizeof *sa_dev + 1017 (e - s + 1) * sizeof (struct ib_sa_port), 1018 GFP_KERNEL); 1019 if (!sa_dev) 1020 return; 1021 1022 sa_dev->start_port = s; 1023 sa_dev->end_port = e; 1024 1025 for (i = 0; i <= e - s; ++i) { 1026 spin_lock_init(&sa_dev->port[i].ah_lock); 1027 if (rdma_port_get_link_layer(device, i + 1) != IB_LINK_LAYER_INFINIBAND) 1028 continue; 1029 1030 sa_dev->port[i].sm_ah = NULL; 1031 sa_dev->port[i].port_num = i + s; 1032 1033 sa_dev->port[i].agent = 1034 ib_register_mad_agent(device, i + s, IB_QPT_GSI, 1035 NULL, 0, send_handler, 1036 recv_handler, sa_dev); 1037 if (IS_ERR(sa_dev->port[i].agent)) 1038 goto err; 1039 1040 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah); 1041 } 1042 1043 ib_set_client_data(device, &sa_client, sa_dev); 1044 1045 /* 1046 * We register our event handler after everything is set up, 1047 * and then update our cached info after the event handler is 1048 * registered to avoid any problems if a port changes state 1049 * during our initialization. 1050 */ 1051 1052 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event); 1053 if (ib_register_event_handler(&sa_dev->event_handler)) 1054 goto err; 1055 1056 for (i = 0; i <= e - s; ++i) 1057 if (rdma_port_get_link_layer(device, i + 1) == IB_LINK_LAYER_INFINIBAND) 1058 update_sm_ah(&sa_dev->port[i].update_task); 1059 1060 return; 1061 1062 err: 1063 while (--i >= 0) 1064 if (rdma_port_get_link_layer(device, i + 1) == IB_LINK_LAYER_INFINIBAND) 1065 ib_unregister_mad_agent(sa_dev->port[i].agent); 1066 1067 kfree(sa_dev); 1068 1069 return; 1070 } 1071 1072 static void ib_sa_remove_one(struct ib_device *device) 1073 { 1074 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 1075 int i; 1076 1077 if (!sa_dev) 1078 return; 1079 1080 ib_unregister_event_handler(&sa_dev->event_handler); 1081 1082 flush_workqueue(ib_wq); 1083 1084 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) { 1085 if (rdma_port_get_link_layer(device, i + 1) == IB_LINK_LAYER_INFINIBAND) { 1086 ib_unregister_mad_agent(sa_dev->port[i].agent); 1087 if (sa_dev->port[i].sm_ah) 1088 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah); 1089 } 1090 1091 } 1092 1093 kfree(sa_dev); 1094 } 1095 1096 static int __init ib_sa_init(void) 1097 { 1098 int ret; 1099 1100 get_random_bytes(&tid, sizeof tid); 1101 1102 ret = ib_register_client(&sa_client); 1103 if (ret) { 1104 printk(KERN_ERR "Couldn't register ib_sa client\n"); 1105 goto err1; 1106 } 1107 1108 ret = mcast_init(); 1109 if (ret) { 1110 printk(KERN_ERR "Couldn't initialize multicast handling\n"); 1111 goto err2; 1112 } 1113 1114 return 0; 1115 err2: 1116 ib_unregister_client(&sa_client); 1117 err1: 1118 return ret; 1119 } 1120 1121 static void __exit ib_sa_cleanup(void) 1122 { 1123 mcast_cleanup(); 1124 ib_unregister_client(&sa_client); 1125 idr_destroy(&query_idr); 1126 } 1127 1128 module_init(ib_sa_init); 1129 module_exit(ib_sa_cleanup); 1130