1 /* 2 * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved. 3 * Copyright (c) 2005 Intel Corporation. All rights reserved. 4 * Copyright (c) 2005 Mellanox Technologies Ltd. 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/dma-mapping.h> 36 #include <rdma/ib_cache.h> 37 38 #include "mad_priv.h" 39 #include "mad_rmpp.h" 40 #include "smi.h" 41 #include "agent.h" 42 43 MODULE_LICENSE("Dual BSD/GPL"); 44 MODULE_DESCRIPTION("kernel IB MAD API"); 45 MODULE_AUTHOR("Hal Rosenstock"); 46 MODULE_AUTHOR("Sean Hefty"); 47 48 static struct kmem_cache *ib_mad_cache; 49 50 static struct list_head ib_mad_port_list; 51 static u32 ib_mad_client_id = 0; 52 53 /* Port list lock */ 54 static spinlock_t ib_mad_port_list_lock; 55 56 57 /* Forward declarations */ 58 static int method_in_use(struct ib_mad_mgmt_method_table **method, 59 struct ib_mad_reg_req *mad_reg_req); 60 static void remove_mad_reg_req(struct ib_mad_agent_private *priv); 61 static struct ib_mad_agent_private *find_mad_agent( 62 struct ib_mad_port_private *port_priv, 63 struct ib_mad *mad); 64 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info, 65 struct ib_mad_private *mad); 66 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv); 67 static void timeout_sends(struct work_struct *work); 68 static void local_completions(struct work_struct *work); 69 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req, 70 struct ib_mad_agent_private *agent_priv, 71 u8 mgmt_class); 72 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req, 73 struct ib_mad_agent_private *agent_priv); 74 75 /* 76 * Returns a ib_mad_port_private structure or NULL for a device/port 77 * Assumes ib_mad_port_list_lock is being held 78 */ 79 static inline struct ib_mad_port_private * 80 __ib_get_mad_port(struct ib_device *device, int port_num) 81 { 82 struct ib_mad_port_private *entry; 83 84 list_for_each_entry(entry, &ib_mad_port_list, port_list) { 85 if (entry->device == device && entry->port_num == port_num) 86 return entry; 87 } 88 return NULL; 89 } 90 91 /* 92 * Wrapper function to return a ib_mad_port_private structure or NULL 93 * for a device/port 94 */ 95 static inline struct ib_mad_port_private * 96 ib_get_mad_port(struct ib_device *device, int port_num) 97 { 98 struct ib_mad_port_private *entry; 99 unsigned long flags; 100 101 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 102 entry = __ib_get_mad_port(device, port_num); 103 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 104 105 return entry; 106 } 107 108 static inline u8 convert_mgmt_class(u8 mgmt_class) 109 { 110 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */ 111 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ? 112 0 : mgmt_class; 113 } 114 115 static int get_spl_qp_index(enum ib_qp_type qp_type) 116 { 117 switch (qp_type) 118 { 119 case IB_QPT_SMI: 120 return 0; 121 case IB_QPT_GSI: 122 return 1; 123 default: 124 return -1; 125 } 126 } 127 128 static int vendor_class_index(u8 mgmt_class) 129 { 130 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START; 131 } 132 133 static int is_vendor_class(u8 mgmt_class) 134 { 135 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) || 136 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END)) 137 return 0; 138 return 1; 139 } 140 141 static int is_vendor_oui(char *oui) 142 { 143 if (oui[0] || oui[1] || oui[2]) 144 return 1; 145 return 0; 146 } 147 148 static int is_vendor_method_in_use( 149 struct ib_mad_mgmt_vendor_class *vendor_class, 150 struct ib_mad_reg_req *mad_reg_req) 151 { 152 struct ib_mad_mgmt_method_table *method; 153 int i; 154 155 for (i = 0; i < MAX_MGMT_OUI; i++) { 156 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) { 157 method = vendor_class->method_table[i]; 158 if (method) { 159 if (method_in_use(&method, mad_reg_req)) 160 return 1; 161 else 162 break; 163 } 164 } 165 } 166 return 0; 167 } 168 169 int ib_response_mad(struct ib_mad *mad) 170 { 171 return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) || 172 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) || 173 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) && 174 (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP))); 175 } 176 EXPORT_SYMBOL(ib_response_mad); 177 178 /* 179 * ib_register_mad_agent - Register to send/receive MADs 180 */ 181 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device, 182 u8 port_num, 183 enum ib_qp_type qp_type, 184 struct ib_mad_reg_req *mad_reg_req, 185 u8 rmpp_version, 186 ib_mad_send_handler send_handler, 187 ib_mad_recv_handler recv_handler, 188 void *context) 189 { 190 struct ib_mad_port_private *port_priv; 191 struct ib_mad_agent *ret = ERR_PTR(-EINVAL); 192 struct ib_mad_agent_private *mad_agent_priv; 193 struct ib_mad_reg_req *reg_req = NULL; 194 struct ib_mad_mgmt_class_table *class; 195 struct ib_mad_mgmt_vendor_class_table *vendor; 196 struct ib_mad_mgmt_vendor_class *vendor_class; 197 struct ib_mad_mgmt_method_table *method; 198 int ret2, qpn; 199 unsigned long flags; 200 u8 mgmt_class, vclass; 201 202 /* Validate parameters */ 203 qpn = get_spl_qp_index(qp_type); 204 if (qpn == -1) 205 goto error1; 206 207 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) 208 goto error1; 209 210 /* Validate MAD registration request if supplied */ 211 if (mad_reg_req) { 212 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) 213 goto error1; 214 if (!recv_handler) 215 goto error1; 216 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) { 217 /* 218 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only 219 * one in this range currently allowed 220 */ 221 if (mad_reg_req->mgmt_class != 222 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 223 goto error1; 224 } else if (mad_reg_req->mgmt_class == 0) { 225 /* 226 * Class 0 is reserved in IBA and is used for 227 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE 228 */ 229 goto error1; 230 } else if (is_vendor_class(mad_reg_req->mgmt_class)) { 231 /* 232 * If class is in "new" vendor range, 233 * ensure supplied OUI is not zero 234 */ 235 if (!is_vendor_oui(mad_reg_req->oui)) 236 goto error1; 237 } 238 /* Make sure class supplied is consistent with RMPP */ 239 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) { 240 if (rmpp_version) 241 goto error1; 242 } 243 /* Make sure class supplied is consistent with QP type */ 244 if (qp_type == IB_QPT_SMI) { 245 if ((mad_reg_req->mgmt_class != 246 IB_MGMT_CLASS_SUBN_LID_ROUTED) && 247 (mad_reg_req->mgmt_class != 248 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) 249 goto error1; 250 } else { 251 if ((mad_reg_req->mgmt_class == 252 IB_MGMT_CLASS_SUBN_LID_ROUTED) || 253 (mad_reg_req->mgmt_class == 254 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) 255 goto error1; 256 } 257 } else { 258 /* No registration request supplied */ 259 if (!send_handler) 260 goto error1; 261 } 262 263 /* Validate device and port */ 264 port_priv = ib_get_mad_port(device, port_num); 265 if (!port_priv) { 266 ret = ERR_PTR(-ENODEV); 267 goto error1; 268 } 269 270 /* Allocate structures */ 271 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL); 272 if (!mad_agent_priv) { 273 ret = ERR_PTR(-ENOMEM); 274 goto error1; 275 } 276 277 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd, 278 IB_ACCESS_LOCAL_WRITE); 279 if (IS_ERR(mad_agent_priv->agent.mr)) { 280 ret = ERR_PTR(-ENOMEM); 281 goto error2; 282 } 283 284 if (mad_reg_req) { 285 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL); 286 if (!reg_req) { 287 ret = ERR_PTR(-ENOMEM); 288 goto error3; 289 } 290 /* Make a copy of the MAD registration request */ 291 memcpy(reg_req, mad_reg_req, sizeof *reg_req); 292 } 293 294 /* Now, fill in the various structures */ 295 mad_agent_priv->qp_info = &port_priv->qp_info[qpn]; 296 mad_agent_priv->reg_req = reg_req; 297 mad_agent_priv->agent.rmpp_version = rmpp_version; 298 mad_agent_priv->agent.device = device; 299 mad_agent_priv->agent.recv_handler = recv_handler; 300 mad_agent_priv->agent.send_handler = send_handler; 301 mad_agent_priv->agent.context = context; 302 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp; 303 mad_agent_priv->agent.port_num = port_num; 304 spin_lock_init(&mad_agent_priv->lock); 305 INIT_LIST_HEAD(&mad_agent_priv->send_list); 306 INIT_LIST_HEAD(&mad_agent_priv->wait_list); 307 INIT_LIST_HEAD(&mad_agent_priv->done_list); 308 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list); 309 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends); 310 INIT_LIST_HEAD(&mad_agent_priv->local_list); 311 INIT_WORK(&mad_agent_priv->local_work, local_completions); 312 atomic_set(&mad_agent_priv->refcount, 1); 313 init_completion(&mad_agent_priv->comp); 314 315 spin_lock_irqsave(&port_priv->reg_lock, flags); 316 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id; 317 318 /* 319 * Make sure MAD registration (if supplied) 320 * is non overlapping with any existing ones 321 */ 322 if (mad_reg_req) { 323 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class); 324 if (!is_vendor_class(mgmt_class)) { 325 class = port_priv->version[mad_reg_req-> 326 mgmt_class_version].class; 327 if (class) { 328 method = class->method_table[mgmt_class]; 329 if (method) { 330 if (method_in_use(&method, 331 mad_reg_req)) 332 goto error4; 333 } 334 } 335 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv, 336 mgmt_class); 337 } else { 338 /* "New" vendor class range */ 339 vendor = port_priv->version[mad_reg_req-> 340 mgmt_class_version].vendor; 341 if (vendor) { 342 vclass = vendor_class_index(mgmt_class); 343 vendor_class = vendor->vendor_class[vclass]; 344 if (vendor_class) { 345 if (is_vendor_method_in_use( 346 vendor_class, 347 mad_reg_req)) 348 goto error4; 349 } 350 } 351 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv); 352 } 353 if (ret2) { 354 ret = ERR_PTR(ret2); 355 goto error4; 356 } 357 } 358 359 /* Add mad agent into port's agent list */ 360 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list); 361 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 362 363 return &mad_agent_priv->agent; 364 365 error4: 366 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 367 kfree(reg_req); 368 error3: 369 ib_dereg_mr(mad_agent_priv->agent.mr); 370 error2: 371 kfree(mad_agent_priv); 372 error1: 373 return ret; 374 } 375 EXPORT_SYMBOL(ib_register_mad_agent); 376 377 static inline int is_snooping_sends(int mad_snoop_flags) 378 { 379 return (mad_snoop_flags & 380 (/*IB_MAD_SNOOP_POSTED_SENDS | 381 IB_MAD_SNOOP_RMPP_SENDS |*/ 382 IB_MAD_SNOOP_SEND_COMPLETIONS /*| 383 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/)); 384 } 385 386 static inline int is_snooping_recvs(int mad_snoop_flags) 387 { 388 return (mad_snoop_flags & 389 (IB_MAD_SNOOP_RECVS /*| 390 IB_MAD_SNOOP_RMPP_RECVS*/)); 391 } 392 393 static int register_snoop_agent(struct ib_mad_qp_info *qp_info, 394 struct ib_mad_snoop_private *mad_snoop_priv) 395 { 396 struct ib_mad_snoop_private **new_snoop_table; 397 unsigned long flags; 398 int i; 399 400 spin_lock_irqsave(&qp_info->snoop_lock, flags); 401 /* Check for empty slot in array. */ 402 for (i = 0; i < qp_info->snoop_table_size; i++) 403 if (!qp_info->snoop_table[i]) 404 break; 405 406 if (i == qp_info->snoop_table_size) { 407 /* Grow table. */ 408 new_snoop_table = krealloc(qp_info->snoop_table, 409 sizeof mad_snoop_priv * 410 (qp_info->snoop_table_size + 1), 411 GFP_ATOMIC); 412 if (!new_snoop_table) { 413 i = -ENOMEM; 414 goto out; 415 } 416 417 qp_info->snoop_table = new_snoop_table; 418 qp_info->snoop_table_size++; 419 } 420 qp_info->snoop_table[i] = mad_snoop_priv; 421 atomic_inc(&qp_info->snoop_count); 422 out: 423 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 424 return i; 425 } 426 427 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device, 428 u8 port_num, 429 enum ib_qp_type qp_type, 430 int mad_snoop_flags, 431 ib_mad_snoop_handler snoop_handler, 432 ib_mad_recv_handler recv_handler, 433 void *context) 434 { 435 struct ib_mad_port_private *port_priv; 436 struct ib_mad_agent *ret; 437 struct ib_mad_snoop_private *mad_snoop_priv; 438 int qpn; 439 440 /* Validate parameters */ 441 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) || 442 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) { 443 ret = ERR_PTR(-EINVAL); 444 goto error1; 445 } 446 qpn = get_spl_qp_index(qp_type); 447 if (qpn == -1) { 448 ret = ERR_PTR(-EINVAL); 449 goto error1; 450 } 451 port_priv = ib_get_mad_port(device, port_num); 452 if (!port_priv) { 453 ret = ERR_PTR(-ENODEV); 454 goto error1; 455 } 456 /* Allocate structures */ 457 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL); 458 if (!mad_snoop_priv) { 459 ret = ERR_PTR(-ENOMEM); 460 goto error1; 461 } 462 463 /* Now, fill in the various structures */ 464 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn]; 465 mad_snoop_priv->agent.device = device; 466 mad_snoop_priv->agent.recv_handler = recv_handler; 467 mad_snoop_priv->agent.snoop_handler = snoop_handler; 468 mad_snoop_priv->agent.context = context; 469 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp; 470 mad_snoop_priv->agent.port_num = port_num; 471 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags; 472 init_completion(&mad_snoop_priv->comp); 473 mad_snoop_priv->snoop_index = register_snoop_agent( 474 &port_priv->qp_info[qpn], 475 mad_snoop_priv); 476 if (mad_snoop_priv->snoop_index < 0) { 477 ret = ERR_PTR(mad_snoop_priv->snoop_index); 478 goto error2; 479 } 480 481 atomic_set(&mad_snoop_priv->refcount, 1); 482 return &mad_snoop_priv->agent; 483 484 error2: 485 kfree(mad_snoop_priv); 486 error1: 487 return ret; 488 } 489 EXPORT_SYMBOL(ib_register_mad_snoop); 490 491 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv) 492 { 493 if (atomic_dec_and_test(&mad_agent_priv->refcount)) 494 complete(&mad_agent_priv->comp); 495 } 496 497 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv) 498 { 499 if (atomic_dec_and_test(&mad_snoop_priv->refcount)) 500 complete(&mad_snoop_priv->comp); 501 } 502 503 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv) 504 { 505 struct ib_mad_port_private *port_priv; 506 unsigned long flags; 507 508 /* Note that we could still be handling received MADs */ 509 510 /* 511 * Canceling all sends results in dropping received response 512 * MADs, preventing us from queuing additional work 513 */ 514 cancel_mads(mad_agent_priv); 515 port_priv = mad_agent_priv->qp_info->port_priv; 516 cancel_delayed_work(&mad_agent_priv->timed_work); 517 518 spin_lock_irqsave(&port_priv->reg_lock, flags); 519 remove_mad_reg_req(mad_agent_priv); 520 list_del(&mad_agent_priv->agent_list); 521 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 522 523 flush_workqueue(port_priv->wq); 524 ib_cancel_rmpp_recvs(mad_agent_priv); 525 526 deref_mad_agent(mad_agent_priv); 527 wait_for_completion(&mad_agent_priv->comp); 528 529 kfree(mad_agent_priv->reg_req); 530 ib_dereg_mr(mad_agent_priv->agent.mr); 531 kfree(mad_agent_priv); 532 } 533 534 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv) 535 { 536 struct ib_mad_qp_info *qp_info; 537 unsigned long flags; 538 539 qp_info = mad_snoop_priv->qp_info; 540 spin_lock_irqsave(&qp_info->snoop_lock, flags); 541 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL; 542 atomic_dec(&qp_info->snoop_count); 543 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 544 545 deref_snoop_agent(mad_snoop_priv); 546 wait_for_completion(&mad_snoop_priv->comp); 547 548 kfree(mad_snoop_priv); 549 } 550 551 /* 552 * ib_unregister_mad_agent - Unregisters a client from using MAD services 553 */ 554 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent) 555 { 556 struct ib_mad_agent_private *mad_agent_priv; 557 struct ib_mad_snoop_private *mad_snoop_priv; 558 559 /* If the TID is zero, the agent can only snoop. */ 560 if (mad_agent->hi_tid) { 561 mad_agent_priv = container_of(mad_agent, 562 struct ib_mad_agent_private, 563 agent); 564 unregister_mad_agent(mad_agent_priv); 565 } else { 566 mad_snoop_priv = container_of(mad_agent, 567 struct ib_mad_snoop_private, 568 agent); 569 unregister_mad_snoop(mad_snoop_priv); 570 } 571 return 0; 572 } 573 EXPORT_SYMBOL(ib_unregister_mad_agent); 574 575 static void dequeue_mad(struct ib_mad_list_head *mad_list) 576 { 577 struct ib_mad_queue *mad_queue; 578 unsigned long flags; 579 580 BUG_ON(!mad_list->mad_queue); 581 mad_queue = mad_list->mad_queue; 582 spin_lock_irqsave(&mad_queue->lock, flags); 583 list_del(&mad_list->list); 584 mad_queue->count--; 585 spin_unlock_irqrestore(&mad_queue->lock, flags); 586 } 587 588 static void snoop_send(struct ib_mad_qp_info *qp_info, 589 struct ib_mad_send_buf *send_buf, 590 struct ib_mad_send_wc *mad_send_wc, 591 int mad_snoop_flags) 592 { 593 struct ib_mad_snoop_private *mad_snoop_priv; 594 unsigned long flags; 595 int i; 596 597 spin_lock_irqsave(&qp_info->snoop_lock, flags); 598 for (i = 0; i < qp_info->snoop_table_size; i++) { 599 mad_snoop_priv = qp_info->snoop_table[i]; 600 if (!mad_snoop_priv || 601 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags)) 602 continue; 603 604 atomic_inc(&mad_snoop_priv->refcount); 605 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 606 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent, 607 send_buf, mad_send_wc); 608 deref_snoop_agent(mad_snoop_priv); 609 spin_lock_irqsave(&qp_info->snoop_lock, flags); 610 } 611 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 612 } 613 614 static void snoop_recv(struct ib_mad_qp_info *qp_info, 615 struct ib_mad_recv_wc *mad_recv_wc, 616 int mad_snoop_flags) 617 { 618 struct ib_mad_snoop_private *mad_snoop_priv; 619 unsigned long flags; 620 int i; 621 622 spin_lock_irqsave(&qp_info->snoop_lock, flags); 623 for (i = 0; i < qp_info->snoop_table_size; i++) { 624 mad_snoop_priv = qp_info->snoop_table[i]; 625 if (!mad_snoop_priv || 626 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags)) 627 continue; 628 629 atomic_inc(&mad_snoop_priv->refcount); 630 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 631 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent, 632 mad_recv_wc); 633 deref_snoop_agent(mad_snoop_priv); 634 spin_lock_irqsave(&qp_info->snoop_lock, flags); 635 } 636 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 637 } 638 639 static void build_smp_wc(struct ib_qp *qp, 640 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num, 641 struct ib_wc *wc) 642 { 643 memset(wc, 0, sizeof *wc); 644 wc->wr_id = wr_id; 645 wc->status = IB_WC_SUCCESS; 646 wc->opcode = IB_WC_RECV; 647 wc->pkey_index = pkey_index; 648 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh); 649 wc->src_qp = IB_QP0; 650 wc->qp = qp; 651 wc->slid = slid; 652 wc->sl = 0; 653 wc->dlid_path_bits = 0; 654 wc->port_num = port_num; 655 } 656 657 /* 658 * Return 0 if SMP is to be sent 659 * Return 1 if SMP was consumed locally (whether or not solicited) 660 * Return < 0 if error 661 */ 662 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv, 663 struct ib_mad_send_wr_private *mad_send_wr) 664 { 665 int ret = 0; 666 struct ib_smp *smp = mad_send_wr->send_buf.mad; 667 unsigned long flags; 668 struct ib_mad_local_private *local; 669 struct ib_mad_private *mad_priv; 670 struct ib_mad_port_private *port_priv; 671 struct ib_mad_agent_private *recv_mad_agent = NULL; 672 struct ib_device *device = mad_agent_priv->agent.device; 673 u8 port_num; 674 struct ib_wc mad_wc; 675 struct ib_send_wr *send_wr = &mad_send_wr->send_wr; 676 677 if (device->node_type == RDMA_NODE_IB_SWITCH && 678 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 679 port_num = send_wr->wr.ud.port_num; 680 else 681 port_num = mad_agent_priv->agent.port_num; 682 683 /* 684 * Directed route handling starts if the initial LID routed part of 685 * a request or the ending LID routed part of a response is empty. 686 * If we are at the start of the LID routed part, don't update the 687 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec. 688 */ 689 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) == 690 IB_LID_PERMISSIVE && 691 smi_handle_dr_smp_send(smp, device->node_type, port_num) == 692 IB_SMI_DISCARD) { 693 ret = -EINVAL; 694 printk(KERN_ERR PFX "Invalid directed route\n"); 695 goto out; 696 } 697 698 /* Check to post send on QP or process locally */ 699 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD && 700 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD) 701 goto out; 702 703 local = kmalloc(sizeof *local, GFP_ATOMIC); 704 if (!local) { 705 ret = -ENOMEM; 706 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n"); 707 goto out; 708 } 709 local->mad_priv = NULL; 710 local->recv_mad_agent = NULL; 711 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC); 712 if (!mad_priv) { 713 ret = -ENOMEM; 714 printk(KERN_ERR PFX "No memory for local response MAD\n"); 715 kfree(local); 716 goto out; 717 } 718 719 build_smp_wc(mad_agent_priv->agent.qp, 720 send_wr->wr_id, be16_to_cpu(smp->dr_slid), 721 send_wr->wr.ud.pkey_index, 722 send_wr->wr.ud.port_num, &mad_wc); 723 724 /* No GRH for DR SMP */ 725 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL, 726 (struct ib_mad *)smp, 727 (struct ib_mad *)&mad_priv->mad); 728 switch (ret) 729 { 730 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY: 731 if (ib_response_mad(&mad_priv->mad.mad) && 732 mad_agent_priv->agent.recv_handler) { 733 local->mad_priv = mad_priv; 734 local->recv_mad_agent = mad_agent_priv; 735 /* 736 * Reference MAD agent until receive 737 * side of local completion handled 738 */ 739 atomic_inc(&mad_agent_priv->refcount); 740 } else 741 kmem_cache_free(ib_mad_cache, mad_priv); 742 break; 743 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED: 744 kmem_cache_free(ib_mad_cache, mad_priv); 745 break; 746 case IB_MAD_RESULT_SUCCESS: 747 /* Treat like an incoming receive MAD */ 748 port_priv = ib_get_mad_port(mad_agent_priv->agent.device, 749 mad_agent_priv->agent.port_num); 750 if (port_priv) { 751 memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad)); 752 recv_mad_agent = find_mad_agent(port_priv, 753 &mad_priv->mad.mad); 754 } 755 if (!port_priv || !recv_mad_agent) { 756 /* 757 * No receiving agent so drop packet and 758 * generate send completion. 759 */ 760 kmem_cache_free(ib_mad_cache, mad_priv); 761 break; 762 } 763 local->mad_priv = mad_priv; 764 local->recv_mad_agent = recv_mad_agent; 765 break; 766 default: 767 kmem_cache_free(ib_mad_cache, mad_priv); 768 kfree(local); 769 ret = -EINVAL; 770 goto out; 771 } 772 773 local->mad_send_wr = mad_send_wr; 774 /* Reference MAD agent until send side of local completion handled */ 775 atomic_inc(&mad_agent_priv->refcount); 776 /* Queue local completion to local list */ 777 spin_lock_irqsave(&mad_agent_priv->lock, flags); 778 list_add_tail(&local->completion_list, &mad_agent_priv->local_list); 779 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 780 queue_work(mad_agent_priv->qp_info->port_priv->wq, 781 &mad_agent_priv->local_work); 782 ret = 1; 783 out: 784 return ret; 785 } 786 787 static int get_pad_size(int hdr_len, int data_len) 788 { 789 int seg_size, pad; 790 791 seg_size = sizeof(struct ib_mad) - hdr_len; 792 if (data_len && seg_size) { 793 pad = seg_size - data_len % seg_size; 794 return pad == seg_size ? 0 : pad; 795 } else 796 return seg_size; 797 } 798 799 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr) 800 { 801 struct ib_rmpp_segment *s, *t; 802 803 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) { 804 list_del(&s->list); 805 kfree(s); 806 } 807 } 808 809 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr, 810 gfp_t gfp_mask) 811 { 812 struct ib_mad_send_buf *send_buf = &send_wr->send_buf; 813 struct ib_rmpp_mad *rmpp_mad = send_buf->mad; 814 struct ib_rmpp_segment *seg = NULL; 815 int left, seg_size, pad; 816 817 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len; 818 seg_size = send_buf->seg_size; 819 pad = send_wr->pad; 820 821 /* Allocate data segments. */ 822 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) { 823 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask); 824 if (!seg) { 825 printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem " 826 "alloc failed for len %zd, gfp %#x\n", 827 sizeof (*seg) + seg_size, gfp_mask); 828 free_send_rmpp_list(send_wr); 829 return -ENOMEM; 830 } 831 seg->num = ++send_buf->seg_count; 832 list_add_tail(&seg->list, &send_wr->rmpp_list); 833 } 834 835 /* Zero any padding */ 836 if (pad) 837 memset(seg->data + seg_size - pad, 0, pad); 838 839 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv-> 840 agent.rmpp_version; 841 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA; 842 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 843 844 send_wr->cur_seg = container_of(send_wr->rmpp_list.next, 845 struct ib_rmpp_segment, list); 846 send_wr->last_ack_seg = send_wr->cur_seg; 847 return 0; 848 } 849 850 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent, 851 u32 remote_qpn, u16 pkey_index, 852 int rmpp_active, 853 int hdr_len, int data_len, 854 gfp_t gfp_mask) 855 { 856 struct ib_mad_agent_private *mad_agent_priv; 857 struct ib_mad_send_wr_private *mad_send_wr; 858 int pad, message_size, ret, size; 859 void *buf; 860 861 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, 862 agent); 863 pad = get_pad_size(hdr_len, data_len); 864 message_size = hdr_len + data_len + pad; 865 866 if ((!mad_agent->rmpp_version && 867 (rmpp_active || message_size > sizeof(struct ib_mad))) || 868 (!rmpp_active && message_size > sizeof(struct ib_mad))) 869 return ERR_PTR(-EINVAL); 870 871 size = rmpp_active ? hdr_len : sizeof(struct ib_mad); 872 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask); 873 if (!buf) 874 return ERR_PTR(-ENOMEM); 875 876 mad_send_wr = buf + size; 877 INIT_LIST_HEAD(&mad_send_wr->rmpp_list); 878 mad_send_wr->send_buf.mad = buf; 879 mad_send_wr->send_buf.hdr_len = hdr_len; 880 mad_send_wr->send_buf.data_len = data_len; 881 mad_send_wr->pad = pad; 882 883 mad_send_wr->mad_agent_priv = mad_agent_priv; 884 mad_send_wr->sg_list[0].length = hdr_len; 885 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey; 886 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len; 887 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey; 888 889 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr; 890 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list; 891 mad_send_wr->send_wr.num_sge = 2; 892 mad_send_wr->send_wr.opcode = IB_WR_SEND; 893 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED; 894 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn; 895 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY; 896 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index; 897 898 if (rmpp_active) { 899 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask); 900 if (ret) { 901 kfree(buf); 902 return ERR_PTR(ret); 903 } 904 } 905 906 mad_send_wr->send_buf.mad_agent = mad_agent; 907 atomic_inc(&mad_agent_priv->refcount); 908 return &mad_send_wr->send_buf; 909 } 910 EXPORT_SYMBOL(ib_create_send_mad); 911 912 int ib_get_mad_data_offset(u8 mgmt_class) 913 { 914 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM) 915 return IB_MGMT_SA_HDR; 916 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) || 917 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) || 918 (mgmt_class == IB_MGMT_CLASS_BIS)) 919 return IB_MGMT_DEVICE_HDR; 920 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && 921 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)) 922 return IB_MGMT_VENDOR_HDR; 923 else 924 return IB_MGMT_MAD_HDR; 925 } 926 EXPORT_SYMBOL(ib_get_mad_data_offset); 927 928 int ib_is_mad_class_rmpp(u8 mgmt_class) 929 { 930 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) || 931 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) || 932 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) || 933 (mgmt_class == IB_MGMT_CLASS_BIS) || 934 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && 935 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))) 936 return 1; 937 return 0; 938 } 939 EXPORT_SYMBOL(ib_is_mad_class_rmpp); 940 941 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num) 942 { 943 struct ib_mad_send_wr_private *mad_send_wr; 944 struct list_head *list; 945 946 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private, 947 send_buf); 948 list = &mad_send_wr->cur_seg->list; 949 950 if (mad_send_wr->cur_seg->num < seg_num) { 951 list_for_each_entry(mad_send_wr->cur_seg, list, list) 952 if (mad_send_wr->cur_seg->num == seg_num) 953 break; 954 } else if (mad_send_wr->cur_seg->num > seg_num) { 955 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list) 956 if (mad_send_wr->cur_seg->num == seg_num) 957 break; 958 } 959 return mad_send_wr->cur_seg->data; 960 } 961 EXPORT_SYMBOL(ib_get_rmpp_segment); 962 963 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr) 964 { 965 if (mad_send_wr->send_buf.seg_count) 966 return ib_get_rmpp_segment(&mad_send_wr->send_buf, 967 mad_send_wr->seg_num); 968 else 969 return mad_send_wr->send_buf.mad + 970 mad_send_wr->send_buf.hdr_len; 971 } 972 973 void ib_free_send_mad(struct ib_mad_send_buf *send_buf) 974 { 975 struct ib_mad_agent_private *mad_agent_priv; 976 struct ib_mad_send_wr_private *mad_send_wr; 977 978 mad_agent_priv = container_of(send_buf->mad_agent, 979 struct ib_mad_agent_private, agent); 980 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private, 981 send_buf); 982 983 free_send_rmpp_list(mad_send_wr); 984 kfree(send_buf->mad); 985 deref_mad_agent(mad_agent_priv); 986 } 987 EXPORT_SYMBOL(ib_free_send_mad); 988 989 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr) 990 { 991 struct ib_mad_qp_info *qp_info; 992 struct list_head *list; 993 struct ib_send_wr *bad_send_wr; 994 struct ib_mad_agent *mad_agent; 995 struct ib_sge *sge; 996 unsigned long flags; 997 int ret; 998 999 /* Set WR ID to find mad_send_wr upon completion */ 1000 qp_info = mad_send_wr->mad_agent_priv->qp_info; 1001 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list; 1002 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue; 1003 1004 mad_agent = mad_send_wr->send_buf.mad_agent; 1005 sge = mad_send_wr->sg_list; 1006 sge[0].addr = ib_dma_map_single(mad_agent->device, 1007 mad_send_wr->send_buf.mad, 1008 sge[0].length, 1009 DMA_TO_DEVICE); 1010 mad_send_wr->header_mapping = sge[0].addr; 1011 1012 sge[1].addr = ib_dma_map_single(mad_agent->device, 1013 ib_get_payload(mad_send_wr), 1014 sge[1].length, 1015 DMA_TO_DEVICE); 1016 mad_send_wr->payload_mapping = sge[1].addr; 1017 1018 spin_lock_irqsave(&qp_info->send_queue.lock, flags); 1019 if (qp_info->send_queue.count < qp_info->send_queue.max_active) { 1020 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr, 1021 &bad_send_wr); 1022 list = &qp_info->send_queue.list; 1023 } else { 1024 ret = 0; 1025 list = &qp_info->overflow_list; 1026 } 1027 1028 if (!ret) { 1029 qp_info->send_queue.count++; 1030 list_add_tail(&mad_send_wr->mad_list.list, list); 1031 } 1032 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); 1033 if (ret) { 1034 ib_dma_unmap_single(mad_agent->device, 1035 mad_send_wr->header_mapping, 1036 sge[0].length, DMA_TO_DEVICE); 1037 ib_dma_unmap_single(mad_agent->device, 1038 mad_send_wr->payload_mapping, 1039 sge[1].length, DMA_TO_DEVICE); 1040 } 1041 return ret; 1042 } 1043 1044 /* 1045 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated 1046 * with the registered client 1047 */ 1048 int ib_post_send_mad(struct ib_mad_send_buf *send_buf, 1049 struct ib_mad_send_buf **bad_send_buf) 1050 { 1051 struct ib_mad_agent_private *mad_agent_priv; 1052 struct ib_mad_send_buf *next_send_buf; 1053 struct ib_mad_send_wr_private *mad_send_wr; 1054 unsigned long flags; 1055 int ret = -EINVAL; 1056 1057 /* Walk list of send WRs and post each on send list */ 1058 for (; send_buf; send_buf = next_send_buf) { 1059 1060 mad_send_wr = container_of(send_buf, 1061 struct ib_mad_send_wr_private, 1062 send_buf); 1063 mad_agent_priv = mad_send_wr->mad_agent_priv; 1064 1065 if (!send_buf->mad_agent->send_handler || 1066 (send_buf->timeout_ms && 1067 !send_buf->mad_agent->recv_handler)) { 1068 ret = -EINVAL; 1069 goto error; 1070 } 1071 1072 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) { 1073 if (mad_agent_priv->agent.rmpp_version) { 1074 ret = -EINVAL; 1075 goto error; 1076 } 1077 } 1078 1079 /* 1080 * Save pointer to next work request to post in case the 1081 * current one completes, and the user modifies the work 1082 * request associated with the completion 1083 */ 1084 next_send_buf = send_buf->next; 1085 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah; 1086 1087 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class == 1088 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 1089 ret = handle_outgoing_dr_smp(mad_agent_priv, 1090 mad_send_wr); 1091 if (ret < 0) /* error */ 1092 goto error; 1093 else if (ret == 1) /* locally consumed */ 1094 continue; 1095 } 1096 1097 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid; 1098 /* Timeout will be updated after send completes */ 1099 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms); 1100 mad_send_wr->max_retries = send_buf->retries; 1101 mad_send_wr->retries_left = send_buf->retries; 1102 send_buf->retries = 0; 1103 /* Reference for work request to QP + response */ 1104 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0); 1105 mad_send_wr->status = IB_WC_SUCCESS; 1106 1107 /* Reference MAD agent until send completes */ 1108 atomic_inc(&mad_agent_priv->refcount); 1109 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1110 list_add_tail(&mad_send_wr->agent_list, 1111 &mad_agent_priv->send_list); 1112 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1113 1114 if (mad_agent_priv->agent.rmpp_version) { 1115 ret = ib_send_rmpp_mad(mad_send_wr); 1116 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED) 1117 ret = ib_send_mad(mad_send_wr); 1118 } else 1119 ret = ib_send_mad(mad_send_wr); 1120 if (ret < 0) { 1121 /* Fail send request */ 1122 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1123 list_del(&mad_send_wr->agent_list); 1124 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1125 atomic_dec(&mad_agent_priv->refcount); 1126 goto error; 1127 } 1128 } 1129 return 0; 1130 error: 1131 if (bad_send_buf) 1132 *bad_send_buf = send_buf; 1133 return ret; 1134 } 1135 EXPORT_SYMBOL(ib_post_send_mad); 1136 1137 /* 1138 * ib_free_recv_mad - Returns data buffers used to receive 1139 * a MAD to the access layer 1140 */ 1141 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc) 1142 { 1143 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf; 1144 struct ib_mad_private_header *mad_priv_hdr; 1145 struct ib_mad_private *priv; 1146 struct list_head free_list; 1147 1148 INIT_LIST_HEAD(&free_list); 1149 list_splice_init(&mad_recv_wc->rmpp_list, &free_list); 1150 1151 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf, 1152 &free_list, list) { 1153 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc, 1154 recv_buf); 1155 mad_priv_hdr = container_of(mad_recv_wc, 1156 struct ib_mad_private_header, 1157 recv_wc); 1158 priv = container_of(mad_priv_hdr, struct ib_mad_private, 1159 header); 1160 kmem_cache_free(ib_mad_cache, priv); 1161 } 1162 } 1163 EXPORT_SYMBOL(ib_free_recv_mad); 1164 1165 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp, 1166 u8 rmpp_version, 1167 ib_mad_send_handler send_handler, 1168 ib_mad_recv_handler recv_handler, 1169 void *context) 1170 { 1171 return ERR_PTR(-EINVAL); /* XXX: for now */ 1172 } 1173 EXPORT_SYMBOL(ib_redirect_mad_qp); 1174 1175 int ib_process_mad_wc(struct ib_mad_agent *mad_agent, 1176 struct ib_wc *wc) 1177 { 1178 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n"); 1179 return 0; 1180 } 1181 EXPORT_SYMBOL(ib_process_mad_wc); 1182 1183 static int method_in_use(struct ib_mad_mgmt_method_table **method, 1184 struct ib_mad_reg_req *mad_reg_req) 1185 { 1186 int i; 1187 1188 for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS); 1189 i < IB_MGMT_MAX_METHODS; 1190 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS, 1191 1+i)) { 1192 if ((*method)->agent[i]) { 1193 printk(KERN_ERR PFX "Method %d already in use\n", i); 1194 return -EINVAL; 1195 } 1196 } 1197 return 0; 1198 } 1199 1200 static int allocate_method_table(struct ib_mad_mgmt_method_table **method) 1201 { 1202 /* Allocate management method table */ 1203 *method = kzalloc(sizeof **method, GFP_ATOMIC); 1204 if (!*method) { 1205 printk(KERN_ERR PFX "No memory for " 1206 "ib_mad_mgmt_method_table\n"); 1207 return -ENOMEM; 1208 } 1209 1210 return 0; 1211 } 1212 1213 /* 1214 * Check to see if there are any methods still in use 1215 */ 1216 static int check_method_table(struct ib_mad_mgmt_method_table *method) 1217 { 1218 int i; 1219 1220 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) 1221 if (method->agent[i]) 1222 return 1; 1223 return 0; 1224 } 1225 1226 /* 1227 * Check to see if there are any method tables for this class still in use 1228 */ 1229 static int check_class_table(struct ib_mad_mgmt_class_table *class) 1230 { 1231 int i; 1232 1233 for (i = 0; i < MAX_MGMT_CLASS; i++) 1234 if (class->method_table[i]) 1235 return 1; 1236 return 0; 1237 } 1238 1239 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class) 1240 { 1241 int i; 1242 1243 for (i = 0; i < MAX_MGMT_OUI; i++) 1244 if (vendor_class->method_table[i]) 1245 return 1; 1246 return 0; 1247 } 1248 1249 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class, 1250 char *oui) 1251 { 1252 int i; 1253 1254 for (i = 0; i < MAX_MGMT_OUI; i++) 1255 /* Is there matching OUI for this vendor class ? */ 1256 if (!memcmp(vendor_class->oui[i], oui, 3)) 1257 return i; 1258 1259 return -1; 1260 } 1261 1262 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor) 1263 { 1264 int i; 1265 1266 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++) 1267 if (vendor->vendor_class[i]) 1268 return 1; 1269 1270 return 0; 1271 } 1272 1273 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method, 1274 struct ib_mad_agent_private *agent) 1275 { 1276 int i; 1277 1278 /* Remove any methods for this mad agent */ 1279 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) { 1280 if (method->agent[i] == agent) { 1281 method->agent[i] = NULL; 1282 } 1283 } 1284 } 1285 1286 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req, 1287 struct ib_mad_agent_private *agent_priv, 1288 u8 mgmt_class) 1289 { 1290 struct ib_mad_port_private *port_priv; 1291 struct ib_mad_mgmt_class_table **class; 1292 struct ib_mad_mgmt_method_table **method; 1293 int i, ret; 1294 1295 port_priv = agent_priv->qp_info->port_priv; 1296 class = &port_priv->version[mad_reg_req->mgmt_class_version].class; 1297 if (!*class) { 1298 /* Allocate management class table for "new" class version */ 1299 *class = kzalloc(sizeof **class, GFP_ATOMIC); 1300 if (!*class) { 1301 printk(KERN_ERR PFX "No memory for " 1302 "ib_mad_mgmt_class_table\n"); 1303 ret = -ENOMEM; 1304 goto error1; 1305 } 1306 1307 /* Allocate method table for this management class */ 1308 method = &(*class)->method_table[mgmt_class]; 1309 if ((ret = allocate_method_table(method))) 1310 goto error2; 1311 } else { 1312 method = &(*class)->method_table[mgmt_class]; 1313 if (!*method) { 1314 /* Allocate method table for this management class */ 1315 if ((ret = allocate_method_table(method))) 1316 goto error1; 1317 } 1318 } 1319 1320 /* Now, make sure methods are not already in use */ 1321 if (method_in_use(method, mad_reg_req)) 1322 goto error3; 1323 1324 /* Finally, add in methods being registered */ 1325 for (i = find_first_bit(mad_reg_req->method_mask, 1326 IB_MGMT_MAX_METHODS); 1327 i < IB_MGMT_MAX_METHODS; 1328 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS, 1329 1+i)) { 1330 (*method)->agent[i] = agent_priv; 1331 } 1332 return 0; 1333 1334 error3: 1335 /* Remove any methods for this mad agent */ 1336 remove_methods_mad_agent(*method, agent_priv); 1337 /* Now, check to see if there are any methods in use */ 1338 if (!check_method_table(*method)) { 1339 /* If not, release management method table */ 1340 kfree(*method); 1341 *method = NULL; 1342 } 1343 ret = -EINVAL; 1344 goto error1; 1345 error2: 1346 kfree(*class); 1347 *class = NULL; 1348 error1: 1349 return ret; 1350 } 1351 1352 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req, 1353 struct ib_mad_agent_private *agent_priv) 1354 { 1355 struct ib_mad_port_private *port_priv; 1356 struct ib_mad_mgmt_vendor_class_table **vendor_table; 1357 struct ib_mad_mgmt_vendor_class_table *vendor = NULL; 1358 struct ib_mad_mgmt_vendor_class *vendor_class = NULL; 1359 struct ib_mad_mgmt_method_table **method; 1360 int i, ret = -ENOMEM; 1361 u8 vclass; 1362 1363 /* "New" vendor (with OUI) class */ 1364 vclass = vendor_class_index(mad_reg_req->mgmt_class); 1365 port_priv = agent_priv->qp_info->port_priv; 1366 vendor_table = &port_priv->version[ 1367 mad_reg_req->mgmt_class_version].vendor; 1368 if (!*vendor_table) { 1369 /* Allocate mgmt vendor class table for "new" class version */ 1370 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC); 1371 if (!vendor) { 1372 printk(KERN_ERR PFX "No memory for " 1373 "ib_mad_mgmt_vendor_class_table\n"); 1374 goto error1; 1375 } 1376 1377 *vendor_table = vendor; 1378 } 1379 if (!(*vendor_table)->vendor_class[vclass]) { 1380 /* Allocate table for this management vendor class */ 1381 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC); 1382 if (!vendor_class) { 1383 printk(KERN_ERR PFX "No memory for " 1384 "ib_mad_mgmt_vendor_class\n"); 1385 goto error2; 1386 } 1387 1388 (*vendor_table)->vendor_class[vclass] = vendor_class; 1389 } 1390 for (i = 0; i < MAX_MGMT_OUI; i++) { 1391 /* Is there matching OUI for this vendor class ? */ 1392 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i], 1393 mad_reg_req->oui, 3)) { 1394 method = &(*vendor_table)->vendor_class[ 1395 vclass]->method_table[i]; 1396 BUG_ON(!*method); 1397 goto check_in_use; 1398 } 1399 } 1400 for (i = 0; i < MAX_MGMT_OUI; i++) { 1401 /* OUI slot available ? */ 1402 if (!is_vendor_oui((*vendor_table)->vendor_class[ 1403 vclass]->oui[i])) { 1404 method = &(*vendor_table)->vendor_class[ 1405 vclass]->method_table[i]; 1406 BUG_ON(*method); 1407 /* Allocate method table for this OUI */ 1408 if ((ret = allocate_method_table(method))) 1409 goto error3; 1410 memcpy((*vendor_table)->vendor_class[vclass]->oui[i], 1411 mad_reg_req->oui, 3); 1412 goto check_in_use; 1413 } 1414 } 1415 printk(KERN_ERR PFX "All OUI slots in use\n"); 1416 goto error3; 1417 1418 check_in_use: 1419 /* Now, make sure methods are not already in use */ 1420 if (method_in_use(method, mad_reg_req)) 1421 goto error4; 1422 1423 /* Finally, add in methods being registered */ 1424 for (i = find_first_bit(mad_reg_req->method_mask, 1425 IB_MGMT_MAX_METHODS); 1426 i < IB_MGMT_MAX_METHODS; 1427 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS, 1428 1+i)) { 1429 (*method)->agent[i] = agent_priv; 1430 } 1431 return 0; 1432 1433 error4: 1434 /* Remove any methods for this mad agent */ 1435 remove_methods_mad_agent(*method, agent_priv); 1436 /* Now, check to see if there are any methods in use */ 1437 if (!check_method_table(*method)) { 1438 /* If not, release management method table */ 1439 kfree(*method); 1440 *method = NULL; 1441 } 1442 ret = -EINVAL; 1443 error3: 1444 if (vendor_class) { 1445 (*vendor_table)->vendor_class[vclass] = NULL; 1446 kfree(vendor_class); 1447 } 1448 error2: 1449 if (vendor) { 1450 *vendor_table = NULL; 1451 kfree(vendor); 1452 } 1453 error1: 1454 return ret; 1455 } 1456 1457 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv) 1458 { 1459 struct ib_mad_port_private *port_priv; 1460 struct ib_mad_mgmt_class_table *class; 1461 struct ib_mad_mgmt_method_table *method; 1462 struct ib_mad_mgmt_vendor_class_table *vendor; 1463 struct ib_mad_mgmt_vendor_class *vendor_class; 1464 int index; 1465 u8 mgmt_class; 1466 1467 /* 1468 * Was MAD registration request supplied 1469 * with original registration ? 1470 */ 1471 if (!agent_priv->reg_req) { 1472 goto out; 1473 } 1474 1475 port_priv = agent_priv->qp_info->port_priv; 1476 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class); 1477 class = port_priv->version[ 1478 agent_priv->reg_req->mgmt_class_version].class; 1479 if (!class) 1480 goto vendor_check; 1481 1482 method = class->method_table[mgmt_class]; 1483 if (method) { 1484 /* Remove any methods for this mad agent */ 1485 remove_methods_mad_agent(method, agent_priv); 1486 /* Now, check to see if there are any methods still in use */ 1487 if (!check_method_table(method)) { 1488 /* If not, release management method table */ 1489 kfree(method); 1490 class->method_table[mgmt_class] = NULL; 1491 /* Any management classes left ? */ 1492 if (!check_class_table(class)) { 1493 /* If not, release management class table */ 1494 kfree(class); 1495 port_priv->version[ 1496 agent_priv->reg_req-> 1497 mgmt_class_version].class = NULL; 1498 } 1499 } 1500 } 1501 1502 vendor_check: 1503 if (!is_vendor_class(mgmt_class)) 1504 goto out; 1505 1506 /* normalize mgmt_class to vendor range 2 */ 1507 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class); 1508 vendor = port_priv->version[ 1509 agent_priv->reg_req->mgmt_class_version].vendor; 1510 1511 if (!vendor) 1512 goto out; 1513 1514 vendor_class = vendor->vendor_class[mgmt_class]; 1515 if (vendor_class) { 1516 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui); 1517 if (index < 0) 1518 goto out; 1519 method = vendor_class->method_table[index]; 1520 if (method) { 1521 /* Remove any methods for this mad agent */ 1522 remove_methods_mad_agent(method, agent_priv); 1523 /* 1524 * Now, check to see if there are 1525 * any methods still in use 1526 */ 1527 if (!check_method_table(method)) { 1528 /* If not, release management method table */ 1529 kfree(method); 1530 vendor_class->method_table[index] = NULL; 1531 memset(vendor_class->oui[index], 0, 3); 1532 /* Any OUIs left ? */ 1533 if (!check_vendor_class(vendor_class)) { 1534 /* If not, release vendor class table */ 1535 kfree(vendor_class); 1536 vendor->vendor_class[mgmt_class] = NULL; 1537 /* Any other vendor classes left ? */ 1538 if (!check_vendor_table(vendor)) { 1539 kfree(vendor); 1540 port_priv->version[ 1541 agent_priv->reg_req-> 1542 mgmt_class_version]. 1543 vendor = NULL; 1544 } 1545 } 1546 } 1547 } 1548 } 1549 1550 out: 1551 return; 1552 } 1553 1554 static struct ib_mad_agent_private * 1555 find_mad_agent(struct ib_mad_port_private *port_priv, 1556 struct ib_mad *mad) 1557 { 1558 struct ib_mad_agent_private *mad_agent = NULL; 1559 unsigned long flags; 1560 1561 spin_lock_irqsave(&port_priv->reg_lock, flags); 1562 if (ib_response_mad(mad)) { 1563 u32 hi_tid; 1564 struct ib_mad_agent_private *entry; 1565 1566 /* 1567 * Routing is based on high 32 bits of transaction ID 1568 * of MAD. 1569 */ 1570 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32; 1571 list_for_each_entry(entry, &port_priv->agent_list, agent_list) { 1572 if (entry->agent.hi_tid == hi_tid) { 1573 mad_agent = entry; 1574 break; 1575 } 1576 } 1577 } else { 1578 struct ib_mad_mgmt_class_table *class; 1579 struct ib_mad_mgmt_method_table *method; 1580 struct ib_mad_mgmt_vendor_class_table *vendor; 1581 struct ib_mad_mgmt_vendor_class *vendor_class; 1582 struct ib_vendor_mad *vendor_mad; 1583 int index; 1584 1585 /* 1586 * Routing is based on version, class, and method 1587 * For "newer" vendor MADs, also based on OUI 1588 */ 1589 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION) 1590 goto out; 1591 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) { 1592 class = port_priv->version[ 1593 mad->mad_hdr.class_version].class; 1594 if (!class) 1595 goto out; 1596 method = class->method_table[convert_mgmt_class( 1597 mad->mad_hdr.mgmt_class)]; 1598 if (method) 1599 mad_agent = method->agent[mad->mad_hdr.method & 1600 ~IB_MGMT_METHOD_RESP]; 1601 } else { 1602 vendor = port_priv->version[ 1603 mad->mad_hdr.class_version].vendor; 1604 if (!vendor) 1605 goto out; 1606 vendor_class = vendor->vendor_class[vendor_class_index( 1607 mad->mad_hdr.mgmt_class)]; 1608 if (!vendor_class) 1609 goto out; 1610 /* Find matching OUI */ 1611 vendor_mad = (struct ib_vendor_mad *)mad; 1612 index = find_vendor_oui(vendor_class, vendor_mad->oui); 1613 if (index == -1) 1614 goto out; 1615 method = vendor_class->method_table[index]; 1616 if (method) { 1617 mad_agent = method->agent[mad->mad_hdr.method & 1618 ~IB_MGMT_METHOD_RESP]; 1619 } 1620 } 1621 } 1622 1623 if (mad_agent) { 1624 if (mad_agent->agent.recv_handler) 1625 atomic_inc(&mad_agent->refcount); 1626 else { 1627 printk(KERN_NOTICE PFX "No receive handler for client " 1628 "%p on port %d\n", 1629 &mad_agent->agent, port_priv->port_num); 1630 mad_agent = NULL; 1631 } 1632 } 1633 out: 1634 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 1635 1636 return mad_agent; 1637 } 1638 1639 static int validate_mad(struct ib_mad *mad, u32 qp_num) 1640 { 1641 int valid = 0; 1642 1643 /* Make sure MAD base version is understood */ 1644 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) { 1645 printk(KERN_ERR PFX "MAD received with unsupported base " 1646 "version %d\n", mad->mad_hdr.base_version); 1647 goto out; 1648 } 1649 1650 /* Filter SMI packets sent to other than QP0 */ 1651 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) || 1652 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) { 1653 if (qp_num == 0) 1654 valid = 1; 1655 } else { 1656 /* Filter GSI packets sent to QP0 */ 1657 if (qp_num != 0) 1658 valid = 1; 1659 } 1660 1661 out: 1662 return valid; 1663 } 1664 1665 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv, 1666 struct ib_mad_hdr *mad_hdr) 1667 { 1668 struct ib_rmpp_mad *rmpp_mad; 1669 1670 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr; 1671 return !mad_agent_priv->agent.rmpp_version || 1672 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 1673 IB_MGMT_RMPP_FLAG_ACTIVE) || 1674 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA); 1675 } 1676 1677 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr, 1678 struct ib_mad_recv_wc *rwc) 1679 { 1680 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class == 1681 rwc->recv_buf.mad->mad_hdr.mgmt_class; 1682 } 1683 1684 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv, 1685 struct ib_mad_send_wr_private *wr, 1686 struct ib_mad_recv_wc *rwc ) 1687 { 1688 struct ib_ah_attr attr; 1689 u8 send_resp, rcv_resp; 1690 union ib_gid sgid; 1691 struct ib_device *device = mad_agent_priv->agent.device; 1692 u8 port_num = mad_agent_priv->agent.port_num; 1693 u8 lmc; 1694 1695 send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad); 1696 rcv_resp = ib_response_mad(rwc->recv_buf.mad); 1697 1698 if (send_resp == rcv_resp) 1699 /* both requests, or both responses. GIDs different */ 1700 return 0; 1701 1702 if (ib_query_ah(wr->send_buf.ah, &attr)) 1703 /* Assume not equal, to avoid false positives. */ 1704 return 0; 1705 1706 if (!!(attr.ah_flags & IB_AH_GRH) != 1707 !!(rwc->wc->wc_flags & IB_WC_GRH)) 1708 /* one has GID, other does not. Assume different */ 1709 return 0; 1710 1711 if (!send_resp && rcv_resp) { 1712 /* is request/response. */ 1713 if (!(attr.ah_flags & IB_AH_GRH)) { 1714 if (ib_get_cached_lmc(device, port_num, &lmc)) 1715 return 0; 1716 return (!lmc || !((attr.src_path_bits ^ 1717 rwc->wc->dlid_path_bits) & 1718 ((1 << lmc) - 1))); 1719 } else { 1720 if (ib_get_cached_gid(device, port_num, 1721 attr.grh.sgid_index, &sgid)) 1722 return 0; 1723 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw, 1724 16); 1725 } 1726 } 1727 1728 if (!(attr.ah_flags & IB_AH_GRH)) 1729 return attr.dlid == rwc->wc->slid; 1730 else 1731 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw, 1732 16); 1733 } 1734 1735 static inline int is_direct(u8 class) 1736 { 1737 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE); 1738 } 1739 1740 struct ib_mad_send_wr_private* 1741 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv, 1742 struct ib_mad_recv_wc *wc) 1743 { 1744 struct ib_mad_send_wr_private *wr; 1745 struct ib_mad *mad; 1746 1747 mad = (struct ib_mad *)wc->recv_buf.mad; 1748 1749 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) { 1750 if ((wr->tid == mad->mad_hdr.tid) && 1751 rcv_has_same_class(wr, wc) && 1752 /* 1753 * Don't check GID for direct routed MADs. 1754 * These might have permissive LIDs. 1755 */ 1756 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) || 1757 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1758 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1759 } 1760 1761 /* 1762 * It's possible to receive the response before we've 1763 * been notified that the send has completed 1764 */ 1765 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) { 1766 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) && 1767 wr->tid == mad->mad_hdr.tid && 1768 wr->timeout && 1769 rcv_has_same_class(wr, wc) && 1770 /* 1771 * Don't check GID for direct routed MADs. 1772 * These might have permissive LIDs. 1773 */ 1774 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) || 1775 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1776 /* Verify request has not been canceled */ 1777 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1778 } 1779 return NULL; 1780 } 1781 1782 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr) 1783 { 1784 mad_send_wr->timeout = 0; 1785 if (mad_send_wr->refcount == 1) 1786 list_move_tail(&mad_send_wr->agent_list, 1787 &mad_send_wr->mad_agent_priv->done_list); 1788 } 1789 1790 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv, 1791 struct ib_mad_recv_wc *mad_recv_wc) 1792 { 1793 struct ib_mad_send_wr_private *mad_send_wr; 1794 struct ib_mad_send_wc mad_send_wc; 1795 unsigned long flags; 1796 1797 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list); 1798 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list); 1799 if (mad_agent_priv->agent.rmpp_version) { 1800 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv, 1801 mad_recv_wc); 1802 if (!mad_recv_wc) { 1803 deref_mad_agent(mad_agent_priv); 1804 return; 1805 } 1806 } 1807 1808 /* Complete corresponding request */ 1809 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) { 1810 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1811 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc); 1812 if (!mad_send_wr) { 1813 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1814 ib_free_recv_mad(mad_recv_wc); 1815 deref_mad_agent(mad_agent_priv); 1816 return; 1817 } 1818 ib_mark_mad_done(mad_send_wr); 1819 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1820 1821 /* Defined behavior is to complete response before request */ 1822 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf; 1823 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, 1824 mad_recv_wc); 1825 atomic_dec(&mad_agent_priv->refcount); 1826 1827 mad_send_wc.status = IB_WC_SUCCESS; 1828 mad_send_wc.vendor_err = 0; 1829 mad_send_wc.send_buf = &mad_send_wr->send_buf; 1830 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 1831 } else { 1832 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, 1833 mad_recv_wc); 1834 deref_mad_agent(mad_agent_priv); 1835 } 1836 } 1837 1838 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv, 1839 struct ib_wc *wc) 1840 { 1841 struct ib_mad_qp_info *qp_info; 1842 struct ib_mad_private_header *mad_priv_hdr; 1843 struct ib_mad_private *recv, *response = NULL; 1844 struct ib_mad_list_head *mad_list; 1845 struct ib_mad_agent_private *mad_agent; 1846 int port_num; 1847 1848 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 1849 qp_info = mad_list->mad_queue->qp_info; 1850 dequeue_mad(mad_list); 1851 1852 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header, 1853 mad_list); 1854 recv = container_of(mad_priv_hdr, struct ib_mad_private, header); 1855 ib_dma_unmap_single(port_priv->device, 1856 recv->header.mapping, 1857 sizeof(struct ib_mad_private) - 1858 sizeof(struct ib_mad_private_header), 1859 DMA_FROM_DEVICE); 1860 1861 /* Setup MAD receive work completion from "normal" work completion */ 1862 recv->header.wc = *wc; 1863 recv->header.recv_wc.wc = &recv->header.wc; 1864 recv->header.recv_wc.mad_len = sizeof(struct ib_mad); 1865 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad; 1866 recv->header.recv_wc.recv_buf.grh = &recv->grh; 1867 1868 if (atomic_read(&qp_info->snoop_count)) 1869 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS); 1870 1871 /* Validate MAD */ 1872 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num)) 1873 goto out; 1874 1875 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL); 1876 if (!response) { 1877 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory " 1878 "for response buffer\n"); 1879 goto out; 1880 } 1881 1882 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) 1883 port_num = wc->port_num; 1884 else 1885 port_num = port_priv->port_num; 1886 1887 if (recv->mad.mad.mad_hdr.mgmt_class == 1888 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 1889 enum smi_forward_action retsmi; 1890 1891 if (smi_handle_dr_smp_recv(&recv->mad.smp, 1892 port_priv->device->node_type, 1893 port_num, 1894 port_priv->device->phys_port_cnt) == 1895 IB_SMI_DISCARD) 1896 goto out; 1897 1898 retsmi = smi_check_forward_dr_smp(&recv->mad.smp); 1899 if (retsmi == IB_SMI_LOCAL) 1900 goto local; 1901 1902 if (retsmi == IB_SMI_SEND) { /* don't forward */ 1903 if (smi_handle_dr_smp_send(&recv->mad.smp, 1904 port_priv->device->node_type, 1905 port_num) == IB_SMI_DISCARD) 1906 goto out; 1907 1908 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD) 1909 goto out; 1910 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) { 1911 /* forward case for switches */ 1912 memcpy(response, recv, sizeof(*response)); 1913 response->header.recv_wc.wc = &response->header.wc; 1914 response->header.recv_wc.recv_buf.mad = &response->mad.mad; 1915 response->header.recv_wc.recv_buf.grh = &response->grh; 1916 1917 agent_send_response(&response->mad.mad, 1918 &response->grh, wc, 1919 port_priv->device, 1920 smi_get_fwd_port(&recv->mad.smp), 1921 qp_info->qp->qp_num); 1922 1923 goto out; 1924 } 1925 } 1926 1927 local: 1928 /* Give driver "right of first refusal" on incoming MAD */ 1929 if (port_priv->device->process_mad) { 1930 int ret; 1931 1932 ret = port_priv->device->process_mad(port_priv->device, 0, 1933 port_priv->port_num, 1934 wc, &recv->grh, 1935 &recv->mad.mad, 1936 &response->mad.mad); 1937 if (ret & IB_MAD_RESULT_SUCCESS) { 1938 if (ret & IB_MAD_RESULT_CONSUMED) 1939 goto out; 1940 if (ret & IB_MAD_RESULT_REPLY) { 1941 agent_send_response(&response->mad.mad, 1942 &recv->grh, wc, 1943 port_priv->device, 1944 port_num, 1945 qp_info->qp->qp_num); 1946 goto out; 1947 } 1948 } 1949 } 1950 1951 mad_agent = find_mad_agent(port_priv, &recv->mad.mad); 1952 if (mad_agent) { 1953 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc); 1954 /* 1955 * recv is freed up in error cases in ib_mad_complete_recv 1956 * or via recv_handler in ib_mad_complete_recv() 1957 */ 1958 recv = NULL; 1959 } 1960 1961 out: 1962 /* Post another receive request for this QP */ 1963 if (response) { 1964 ib_mad_post_receive_mads(qp_info, response); 1965 if (recv) 1966 kmem_cache_free(ib_mad_cache, recv); 1967 } else 1968 ib_mad_post_receive_mads(qp_info, recv); 1969 } 1970 1971 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv) 1972 { 1973 struct ib_mad_send_wr_private *mad_send_wr; 1974 unsigned long delay; 1975 1976 if (list_empty(&mad_agent_priv->wait_list)) { 1977 cancel_delayed_work(&mad_agent_priv->timed_work); 1978 } else { 1979 mad_send_wr = list_entry(mad_agent_priv->wait_list.next, 1980 struct ib_mad_send_wr_private, 1981 agent_list); 1982 1983 if (time_after(mad_agent_priv->timeout, 1984 mad_send_wr->timeout)) { 1985 mad_agent_priv->timeout = mad_send_wr->timeout; 1986 cancel_delayed_work(&mad_agent_priv->timed_work); 1987 delay = mad_send_wr->timeout - jiffies; 1988 if ((long)delay <= 0) 1989 delay = 1; 1990 queue_delayed_work(mad_agent_priv->qp_info-> 1991 port_priv->wq, 1992 &mad_agent_priv->timed_work, delay); 1993 } 1994 } 1995 } 1996 1997 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr) 1998 { 1999 struct ib_mad_agent_private *mad_agent_priv; 2000 struct ib_mad_send_wr_private *temp_mad_send_wr; 2001 struct list_head *list_item; 2002 unsigned long delay; 2003 2004 mad_agent_priv = mad_send_wr->mad_agent_priv; 2005 list_del(&mad_send_wr->agent_list); 2006 2007 delay = mad_send_wr->timeout; 2008 mad_send_wr->timeout += jiffies; 2009 2010 if (delay) { 2011 list_for_each_prev(list_item, &mad_agent_priv->wait_list) { 2012 temp_mad_send_wr = list_entry(list_item, 2013 struct ib_mad_send_wr_private, 2014 agent_list); 2015 if (time_after(mad_send_wr->timeout, 2016 temp_mad_send_wr->timeout)) 2017 break; 2018 } 2019 } 2020 else 2021 list_item = &mad_agent_priv->wait_list; 2022 list_add(&mad_send_wr->agent_list, list_item); 2023 2024 /* Reschedule a work item if we have a shorter timeout */ 2025 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) { 2026 cancel_delayed_work(&mad_agent_priv->timed_work); 2027 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq, 2028 &mad_agent_priv->timed_work, delay); 2029 } 2030 } 2031 2032 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr, 2033 int timeout_ms) 2034 { 2035 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2036 wait_for_response(mad_send_wr); 2037 } 2038 2039 /* 2040 * Process a send work completion 2041 */ 2042 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr, 2043 struct ib_mad_send_wc *mad_send_wc) 2044 { 2045 struct ib_mad_agent_private *mad_agent_priv; 2046 unsigned long flags; 2047 int ret; 2048 2049 mad_agent_priv = mad_send_wr->mad_agent_priv; 2050 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2051 if (mad_agent_priv->agent.rmpp_version) { 2052 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc); 2053 if (ret == IB_RMPP_RESULT_CONSUMED) 2054 goto done; 2055 } else 2056 ret = IB_RMPP_RESULT_UNHANDLED; 2057 2058 if (mad_send_wc->status != IB_WC_SUCCESS && 2059 mad_send_wr->status == IB_WC_SUCCESS) { 2060 mad_send_wr->status = mad_send_wc->status; 2061 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2062 } 2063 2064 if (--mad_send_wr->refcount > 0) { 2065 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout && 2066 mad_send_wr->status == IB_WC_SUCCESS) { 2067 wait_for_response(mad_send_wr); 2068 } 2069 goto done; 2070 } 2071 2072 /* Remove send from MAD agent and notify client of completion */ 2073 list_del(&mad_send_wr->agent_list); 2074 adjust_timeout(mad_agent_priv); 2075 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2076 2077 if (mad_send_wr->status != IB_WC_SUCCESS ) 2078 mad_send_wc->status = mad_send_wr->status; 2079 if (ret == IB_RMPP_RESULT_INTERNAL) 2080 ib_rmpp_send_handler(mad_send_wc); 2081 else 2082 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2083 mad_send_wc); 2084 2085 /* Release reference on agent taken when sending */ 2086 deref_mad_agent(mad_agent_priv); 2087 return; 2088 done: 2089 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2090 } 2091 2092 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv, 2093 struct ib_wc *wc) 2094 { 2095 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr; 2096 struct ib_mad_list_head *mad_list; 2097 struct ib_mad_qp_info *qp_info; 2098 struct ib_mad_queue *send_queue; 2099 struct ib_send_wr *bad_send_wr; 2100 struct ib_mad_send_wc mad_send_wc; 2101 unsigned long flags; 2102 int ret; 2103 2104 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 2105 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2106 mad_list); 2107 send_queue = mad_list->mad_queue; 2108 qp_info = send_queue->qp_info; 2109 2110 retry: 2111 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2112 mad_send_wr->header_mapping, 2113 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE); 2114 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2115 mad_send_wr->payload_mapping, 2116 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE); 2117 queued_send_wr = NULL; 2118 spin_lock_irqsave(&send_queue->lock, flags); 2119 list_del(&mad_list->list); 2120 2121 /* Move queued send to the send queue */ 2122 if (send_queue->count-- > send_queue->max_active) { 2123 mad_list = container_of(qp_info->overflow_list.next, 2124 struct ib_mad_list_head, list); 2125 queued_send_wr = container_of(mad_list, 2126 struct ib_mad_send_wr_private, 2127 mad_list); 2128 list_move_tail(&mad_list->list, &send_queue->list); 2129 } 2130 spin_unlock_irqrestore(&send_queue->lock, flags); 2131 2132 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2133 mad_send_wc.status = wc->status; 2134 mad_send_wc.vendor_err = wc->vendor_err; 2135 if (atomic_read(&qp_info->snoop_count)) 2136 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc, 2137 IB_MAD_SNOOP_SEND_COMPLETIONS); 2138 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 2139 2140 if (queued_send_wr) { 2141 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr, 2142 &bad_send_wr); 2143 if (ret) { 2144 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret); 2145 mad_send_wr = queued_send_wr; 2146 wc->status = IB_WC_LOC_QP_OP_ERR; 2147 goto retry; 2148 } 2149 } 2150 } 2151 2152 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info) 2153 { 2154 struct ib_mad_send_wr_private *mad_send_wr; 2155 struct ib_mad_list_head *mad_list; 2156 unsigned long flags; 2157 2158 spin_lock_irqsave(&qp_info->send_queue.lock, flags); 2159 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) { 2160 mad_send_wr = container_of(mad_list, 2161 struct ib_mad_send_wr_private, 2162 mad_list); 2163 mad_send_wr->retry = 1; 2164 } 2165 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); 2166 } 2167 2168 static void mad_error_handler(struct ib_mad_port_private *port_priv, 2169 struct ib_wc *wc) 2170 { 2171 struct ib_mad_list_head *mad_list; 2172 struct ib_mad_qp_info *qp_info; 2173 struct ib_mad_send_wr_private *mad_send_wr; 2174 int ret; 2175 2176 /* Determine if failure was a send or receive */ 2177 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 2178 qp_info = mad_list->mad_queue->qp_info; 2179 if (mad_list->mad_queue == &qp_info->recv_queue) 2180 /* 2181 * Receive errors indicate that the QP has entered the error 2182 * state - error handling/shutdown code will cleanup 2183 */ 2184 return; 2185 2186 /* 2187 * Send errors will transition the QP to SQE - move 2188 * QP to RTS and repost flushed work requests 2189 */ 2190 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2191 mad_list); 2192 if (wc->status == IB_WC_WR_FLUSH_ERR) { 2193 if (mad_send_wr->retry) { 2194 /* Repost send */ 2195 struct ib_send_wr *bad_send_wr; 2196 2197 mad_send_wr->retry = 0; 2198 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr, 2199 &bad_send_wr); 2200 if (ret) 2201 ib_mad_send_done_handler(port_priv, wc); 2202 } else 2203 ib_mad_send_done_handler(port_priv, wc); 2204 } else { 2205 struct ib_qp_attr *attr; 2206 2207 /* Transition QP to RTS and fail offending send */ 2208 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2209 if (attr) { 2210 attr->qp_state = IB_QPS_RTS; 2211 attr->cur_qp_state = IB_QPS_SQE; 2212 ret = ib_modify_qp(qp_info->qp, attr, 2213 IB_QP_STATE | IB_QP_CUR_STATE); 2214 kfree(attr); 2215 if (ret) 2216 printk(KERN_ERR PFX "mad_error_handler - " 2217 "ib_modify_qp to RTS : %d\n", ret); 2218 else 2219 mark_sends_for_retry(qp_info); 2220 } 2221 ib_mad_send_done_handler(port_priv, wc); 2222 } 2223 } 2224 2225 /* 2226 * IB MAD completion callback 2227 */ 2228 static void ib_mad_completion_handler(struct work_struct *work) 2229 { 2230 struct ib_mad_port_private *port_priv; 2231 struct ib_wc wc; 2232 2233 port_priv = container_of(work, struct ib_mad_port_private, work); 2234 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); 2235 2236 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) { 2237 if (wc.status == IB_WC_SUCCESS) { 2238 switch (wc.opcode) { 2239 case IB_WC_SEND: 2240 ib_mad_send_done_handler(port_priv, &wc); 2241 break; 2242 case IB_WC_RECV: 2243 ib_mad_recv_done_handler(port_priv, &wc); 2244 break; 2245 default: 2246 BUG_ON(1); 2247 break; 2248 } 2249 } else 2250 mad_error_handler(port_priv, &wc); 2251 } 2252 } 2253 2254 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv) 2255 { 2256 unsigned long flags; 2257 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr; 2258 struct ib_mad_send_wc mad_send_wc; 2259 struct list_head cancel_list; 2260 2261 INIT_LIST_HEAD(&cancel_list); 2262 2263 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2264 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2265 &mad_agent_priv->send_list, agent_list) { 2266 if (mad_send_wr->status == IB_WC_SUCCESS) { 2267 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2268 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2269 } 2270 } 2271 2272 /* Empty wait list to prevent receives from finding a request */ 2273 list_splice_init(&mad_agent_priv->wait_list, &cancel_list); 2274 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2275 2276 /* Report all cancelled requests */ 2277 mad_send_wc.status = IB_WC_WR_FLUSH_ERR; 2278 mad_send_wc.vendor_err = 0; 2279 2280 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2281 &cancel_list, agent_list) { 2282 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2283 list_del(&mad_send_wr->agent_list); 2284 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2285 &mad_send_wc); 2286 atomic_dec(&mad_agent_priv->refcount); 2287 } 2288 } 2289 2290 static struct ib_mad_send_wr_private* 2291 find_send_wr(struct ib_mad_agent_private *mad_agent_priv, 2292 struct ib_mad_send_buf *send_buf) 2293 { 2294 struct ib_mad_send_wr_private *mad_send_wr; 2295 2296 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list, 2297 agent_list) { 2298 if (&mad_send_wr->send_buf == send_buf) 2299 return mad_send_wr; 2300 } 2301 2302 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list, 2303 agent_list) { 2304 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) && 2305 &mad_send_wr->send_buf == send_buf) 2306 return mad_send_wr; 2307 } 2308 return NULL; 2309 } 2310 2311 int ib_modify_mad(struct ib_mad_agent *mad_agent, 2312 struct ib_mad_send_buf *send_buf, u32 timeout_ms) 2313 { 2314 struct ib_mad_agent_private *mad_agent_priv; 2315 struct ib_mad_send_wr_private *mad_send_wr; 2316 unsigned long flags; 2317 int active; 2318 2319 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, 2320 agent); 2321 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2322 mad_send_wr = find_send_wr(mad_agent_priv, send_buf); 2323 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) { 2324 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2325 return -EINVAL; 2326 } 2327 2328 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1); 2329 if (!timeout_ms) { 2330 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2331 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2332 } 2333 2334 mad_send_wr->send_buf.timeout_ms = timeout_ms; 2335 if (active) 2336 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2337 else 2338 ib_reset_mad_timeout(mad_send_wr, timeout_ms); 2339 2340 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2341 return 0; 2342 } 2343 EXPORT_SYMBOL(ib_modify_mad); 2344 2345 void ib_cancel_mad(struct ib_mad_agent *mad_agent, 2346 struct ib_mad_send_buf *send_buf) 2347 { 2348 ib_modify_mad(mad_agent, send_buf, 0); 2349 } 2350 EXPORT_SYMBOL(ib_cancel_mad); 2351 2352 static void local_completions(struct work_struct *work) 2353 { 2354 struct ib_mad_agent_private *mad_agent_priv; 2355 struct ib_mad_local_private *local; 2356 struct ib_mad_agent_private *recv_mad_agent; 2357 unsigned long flags; 2358 int free_mad; 2359 struct ib_wc wc; 2360 struct ib_mad_send_wc mad_send_wc; 2361 2362 mad_agent_priv = 2363 container_of(work, struct ib_mad_agent_private, local_work); 2364 2365 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2366 while (!list_empty(&mad_agent_priv->local_list)) { 2367 local = list_entry(mad_agent_priv->local_list.next, 2368 struct ib_mad_local_private, 2369 completion_list); 2370 list_del(&local->completion_list); 2371 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2372 free_mad = 0; 2373 if (local->mad_priv) { 2374 recv_mad_agent = local->recv_mad_agent; 2375 if (!recv_mad_agent) { 2376 printk(KERN_ERR PFX "No receive MAD agent for local completion\n"); 2377 free_mad = 1; 2378 goto local_send_completion; 2379 } 2380 2381 /* 2382 * Defined behavior is to complete response 2383 * before request 2384 */ 2385 build_smp_wc(recv_mad_agent->agent.qp, 2386 (unsigned long) local->mad_send_wr, 2387 be16_to_cpu(IB_LID_PERMISSIVE), 2388 0, recv_mad_agent->agent.port_num, &wc); 2389 2390 local->mad_priv->header.recv_wc.wc = &wc; 2391 local->mad_priv->header.recv_wc.mad_len = 2392 sizeof(struct ib_mad); 2393 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list); 2394 list_add(&local->mad_priv->header.recv_wc.recv_buf.list, 2395 &local->mad_priv->header.recv_wc.rmpp_list); 2396 local->mad_priv->header.recv_wc.recv_buf.grh = NULL; 2397 local->mad_priv->header.recv_wc.recv_buf.mad = 2398 &local->mad_priv->mad.mad; 2399 if (atomic_read(&recv_mad_agent->qp_info->snoop_count)) 2400 snoop_recv(recv_mad_agent->qp_info, 2401 &local->mad_priv->header.recv_wc, 2402 IB_MAD_SNOOP_RECVS); 2403 recv_mad_agent->agent.recv_handler( 2404 &recv_mad_agent->agent, 2405 &local->mad_priv->header.recv_wc); 2406 spin_lock_irqsave(&recv_mad_agent->lock, flags); 2407 atomic_dec(&recv_mad_agent->refcount); 2408 spin_unlock_irqrestore(&recv_mad_agent->lock, flags); 2409 } 2410 2411 local_send_completion: 2412 /* Complete send */ 2413 mad_send_wc.status = IB_WC_SUCCESS; 2414 mad_send_wc.vendor_err = 0; 2415 mad_send_wc.send_buf = &local->mad_send_wr->send_buf; 2416 if (atomic_read(&mad_agent_priv->qp_info->snoop_count)) 2417 snoop_send(mad_agent_priv->qp_info, 2418 &local->mad_send_wr->send_buf, 2419 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS); 2420 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2421 &mad_send_wc); 2422 2423 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2424 atomic_dec(&mad_agent_priv->refcount); 2425 if (free_mad) 2426 kmem_cache_free(ib_mad_cache, local->mad_priv); 2427 kfree(local); 2428 } 2429 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2430 } 2431 2432 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr) 2433 { 2434 int ret; 2435 2436 if (!mad_send_wr->retries_left) 2437 return -ETIMEDOUT; 2438 2439 mad_send_wr->retries_left--; 2440 mad_send_wr->send_buf.retries++; 2441 2442 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms); 2443 2444 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) { 2445 ret = ib_retry_rmpp(mad_send_wr); 2446 switch (ret) { 2447 case IB_RMPP_RESULT_UNHANDLED: 2448 ret = ib_send_mad(mad_send_wr); 2449 break; 2450 case IB_RMPP_RESULT_CONSUMED: 2451 ret = 0; 2452 break; 2453 default: 2454 ret = -ECOMM; 2455 break; 2456 } 2457 } else 2458 ret = ib_send_mad(mad_send_wr); 2459 2460 if (!ret) { 2461 mad_send_wr->refcount++; 2462 list_add_tail(&mad_send_wr->agent_list, 2463 &mad_send_wr->mad_agent_priv->send_list); 2464 } 2465 return ret; 2466 } 2467 2468 static void timeout_sends(struct work_struct *work) 2469 { 2470 struct ib_mad_agent_private *mad_agent_priv; 2471 struct ib_mad_send_wr_private *mad_send_wr; 2472 struct ib_mad_send_wc mad_send_wc; 2473 unsigned long flags, delay; 2474 2475 mad_agent_priv = container_of(work, struct ib_mad_agent_private, 2476 timed_work.work); 2477 mad_send_wc.vendor_err = 0; 2478 2479 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2480 while (!list_empty(&mad_agent_priv->wait_list)) { 2481 mad_send_wr = list_entry(mad_agent_priv->wait_list.next, 2482 struct ib_mad_send_wr_private, 2483 agent_list); 2484 2485 if (time_after(mad_send_wr->timeout, jiffies)) { 2486 delay = mad_send_wr->timeout - jiffies; 2487 if ((long)delay <= 0) 2488 delay = 1; 2489 queue_delayed_work(mad_agent_priv->qp_info-> 2490 port_priv->wq, 2491 &mad_agent_priv->timed_work, delay); 2492 break; 2493 } 2494 2495 list_del(&mad_send_wr->agent_list); 2496 if (mad_send_wr->status == IB_WC_SUCCESS && 2497 !retry_send(mad_send_wr)) 2498 continue; 2499 2500 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2501 2502 if (mad_send_wr->status == IB_WC_SUCCESS) 2503 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR; 2504 else 2505 mad_send_wc.status = mad_send_wr->status; 2506 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2507 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2508 &mad_send_wc); 2509 2510 atomic_dec(&mad_agent_priv->refcount); 2511 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2512 } 2513 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2514 } 2515 2516 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg) 2517 { 2518 struct ib_mad_port_private *port_priv = cq->cq_context; 2519 unsigned long flags; 2520 2521 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2522 if (!list_empty(&port_priv->port_list)) 2523 queue_work(port_priv->wq, &port_priv->work); 2524 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2525 } 2526 2527 /* 2528 * Allocate receive MADs and post receive WRs for them 2529 */ 2530 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info, 2531 struct ib_mad_private *mad) 2532 { 2533 unsigned long flags; 2534 int post, ret; 2535 struct ib_mad_private *mad_priv; 2536 struct ib_sge sg_list; 2537 struct ib_recv_wr recv_wr, *bad_recv_wr; 2538 struct ib_mad_queue *recv_queue = &qp_info->recv_queue; 2539 2540 /* Initialize common scatter list fields */ 2541 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header; 2542 sg_list.lkey = (*qp_info->port_priv->mr).lkey; 2543 2544 /* Initialize common receive WR fields */ 2545 recv_wr.next = NULL; 2546 recv_wr.sg_list = &sg_list; 2547 recv_wr.num_sge = 1; 2548 2549 do { 2550 /* Allocate and map receive buffer */ 2551 if (mad) { 2552 mad_priv = mad; 2553 mad = NULL; 2554 } else { 2555 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL); 2556 if (!mad_priv) { 2557 printk(KERN_ERR PFX "No memory for receive buffer\n"); 2558 ret = -ENOMEM; 2559 break; 2560 } 2561 } 2562 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device, 2563 &mad_priv->grh, 2564 sizeof *mad_priv - 2565 sizeof mad_priv->header, 2566 DMA_FROM_DEVICE); 2567 mad_priv->header.mapping = sg_list.addr; 2568 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list; 2569 mad_priv->header.mad_list.mad_queue = recv_queue; 2570 2571 /* Post receive WR */ 2572 spin_lock_irqsave(&recv_queue->lock, flags); 2573 post = (++recv_queue->count < recv_queue->max_active); 2574 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list); 2575 spin_unlock_irqrestore(&recv_queue->lock, flags); 2576 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr); 2577 if (ret) { 2578 spin_lock_irqsave(&recv_queue->lock, flags); 2579 list_del(&mad_priv->header.mad_list.list); 2580 recv_queue->count--; 2581 spin_unlock_irqrestore(&recv_queue->lock, flags); 2582 ib_dma_unmap_single(qp_info->port_priv->device, 2583 mad_priv->header.mapping, 2584 sizeof *mad_priv - 2585 sizeof mad_priv->header, 2586 DMA_FROM_DEVICE); 2587 kmem_cache_free(ib_mad_cache, mad_priv); 2588 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret); 2589 break; 2590 } 2591 } while (post); 2592 2593 return ret; 2594 } 2595 2596 /* 2597 * Return all the posted receive MADs 2598 */ 2599 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info) 2600 { 2601 struct ib_mad_private_header *mad_priv_hdr; 2602 struct ib_mad_private *recv; 2603 struct ib_mad_list_head *mad_list; 2604 2605 while (!list_empty(&qp_info->recv_queue.list)) { 2606 2607 mad_list = list_entry(qp_info->recv_queue.list.next, 2608 struct ib_mad_list_head, list); 2609 mad_priv_hdr = container_of(mad_list, 2610 struct ib_mad_private_header, 2611 mad_list); 2612 recv = container_of(mad_priv_hdr, struct ib_mad_private, 2613 header); 2614 2615 /* Remove from posted receive MAD list */ 2616 list_del(&mad_list->list); 2617 2618 ib_dma_unmap_single(qp_info->port_priv->device, 2619 recv->header.mapping, 2620 sizeof(struct ib_mad_private) - 2621 sizeof(struct ib_mad_private_header), 2622 DMA_FROM_DEVICE); 2623 kmem_cache_free(ib_mad_cache, recv); 2624 } 2625 2626 qp_info->recv_queue.count = 0; 2627 } 2628 2629 /* 2630 * Start the port 2631 */ 2632 static int ib_mad_port_start(struct ib_mad_port_private *port_priv) 2633 { 2634 int ret, i; 2635 struct ib_qp_attr *attr; 2636 struct ib_qp *qp; 2637 2638 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2639 if (!attr) { 2640 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n"); 2641 return -ENOMEM; 2642 } 2643 2644 for (i = 0; i < IB_MAD_QPS_CORE; i++) { 2645 qp = port_priv->qp_info[i].qp; 2646 /* 2647 * PKey index for QP1 is irrelevant but 2648 * one is needed for the Reset to Init transition 2649 */ 2650 attr->qp_state = IB_QPS_INIT; 2651 attr->pkey_index = 0; 2652 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY; 2653 ret = ib_modify_qp(qp, attr, IB_QP_STATE | 2654 IB_QP_PKEY_INDEX | IB_QP_QKEY); 2655 if (ret) { 2656 printk(KERN_ERR PFX "Couldn't change QP%d state to " 2657 "INIT: %d\n", i, ret); 2658 goto out; 2659 } 2660 2661 attr->qp_state = IB_QPS_RTR; 2662 ret = ib_modify_qp(qp, attr, IB_QP_STATE); 2663 if (ret) { 2664 printk(KERN_ERR PFX "Couldn't change QP%d state to " 2665 "RTR: %d\n", i, ret); 2666 goto out; 2667 } 2668 2669 attr->qp_state = IB_QPS_RTS; 2670 attr->sq_psn = IB_MAD_SEND_Q_PSN; 2671 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN); 2672 if (ret) { 2673 printk(KERN_ERR PFX "Couldn't change QP%d state to " 2674 "RTS: %d\n", i, ret); 2675 goto out; 2676 } 2677 } 2678 2679 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); 2680 if (ret) { 2681 printk(KERN_ERR PFX "Failed to request completion " 2682 "notification: %d\n", ret); 2683 goto out; 2684 } 2685 2686 for (i = 0; i < IB_MAD_QPS_CORE; i++) { 2687 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL); 2688 if (ret) { 2689 printk(KERN_ERR PFX "Couldn't post receive WRs\n"); 2690 goto out; 2691 } 2692 } 2693 out: 2694 kfree(attr); 2695 return ret; 2696 } 2697 2698 static void qp_event_handler(struct ib_event *event, void *qp_context) 2699 { 2700 struct ib_mad_qp_info *qp_info = qp_context; 2701 2702 /* It's worse than that! He's dead, Jim! */ 2703 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n", 2704 event->event, qp_info->qp->qp_num); 2705 } 2706 2707 static void init_mad_queue(struct ib_mad_qp_info *qp_info, 2708 struct ib_mad_queue *mad_queue) 2709 { 2710 mad_queue->qp_info = qp_info; 2711 mad_queue->count = 0; 2712 spin_lock_init(&mad_queue->lock); 2713 INIT_LIST_HEAD(&mad_queue->list); 2714 } 2715 2716 static void init_mad_qp(struct ib_mad_port_private *port_priv, 2717 struct ib_mad_qp_info *qp_info) 2718 { 2719 qp_info->port_priv = port_priv; 2720 init_mad_queue(qp_info, &qp_info->send_queue); 2721 init_mad_queue(qp_info, &qp_info->recv_queue); 2722 INIT_LIST_HEAD(&qp_info->overflow_list); 2723 spin_lock_init(&qp_info->snoop_lock); 2724 qp_info->snoop_table = NULL; 2725 qp_info->snoop_table_size = 0; 2726 atomic_set(&qp_info->snoop_count, 0); 2727 } 2728 2729 static int create_mad_qp(struct ib_mad_qp_info *qp_info, 2730 enum ib_qp_type qp_type) 2731 { 2732 struct ib_qp_init_attr qp_init_attr; 2733 int ret; 2734 2735 memset(&qp_init_attr, 0, sizeof qp_init_attr); 2736 qp_init_attr.send_cq = qp_info->port_priv->cq; 2737 qp_init_attr.recv_cq = qp_info->port_priv->cq; 2738 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR; 2739 qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE; 2740 qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE; 2741 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG; 2742 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG; 2743 qp_init_attr.qp_type = qp_type; 2744 qp_init_attr.port_num = qp_info->port_priv->port_num; 2745 qp_init_attr.qp_context = qp_info; 2746 qp_init_attr.event_handler = qp_event_handler; 2747 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr); 2748 if (IS_ERR(qp_info->qp)) { 2749 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n", 2750 get_spl_qp_index(qp_type)); 2751 ret = PTR_ERR(qp_info->qp); 2752 goto error; 2753 } 2754 /* Use minimum queue sizes unless the CQ is resized */ 2755 qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE; 2756 qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE; 2757 return 0; 2758 2759 error: 2760 return ret; 2761 } 2762 2763 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info) 2764 { 2765 ib_destroy_qp(qp_info->qp); 2766 kfree(qp_info->snoop_table); 2767 } 2768 2769 /* 2770 * Open the port 2771 * Create the QP, PD, MR, and CQ if needed 2772 */ 2773 static int ib_mad_port_open(struct ib_device *device, 2774 int port_num) 2775 { 2776 int ret, cq_size; 2777 struct ib_mad_port_private *port_priv; 2778 unsigned long flags; 2779 char name[sizeof "ib_mad123"]; 2780 2781 /* Create new device info */ 2782 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL); 2783 if (!port_priv) { 2784 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n"); 2785 return -ENOMEM; 2786 } 2787 2788 port_priv->device = device; 2789 port_priv->port_num = port_num; 2790 spin_lock_init(&port_priv->reg_lock); 2791 INIT_LIST_HEAD(&port_priv->agent_list); 2792 init_mad_qp(port_priv, &port_priv->qp_info[0]); 2793 init_mad_qp(port_priv, &port_priv->qp_info[1]); 2794 2795 cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2; 2796 port_priv->cq = ib_create_cq(port_priv->device, 2797 ib_mad_thread_completion_handler, 2798 NULL, port_priv, cq_size, 0); 2799 if (IS_ERR(port_priv->cq)) { 2800 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n"); 2801 ret = PTR_ERR(port_priv->cq); 2802 goto error3; 2803 } 2804 2805 port_priv->pd = ib_alloc_pd(device); 2806 if (IS_ERR(port_priv->pd)) { 2807 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n"); 2808 ret = PTR_ERR(port_priv->pd); 2809 goto error4; 2810 } 2811 2812 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE); 2813 if (IS_ERR(port_priv->mr)) { 2814 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n"); 2815 ret = PTR_ERR(port_priv->mr); 2816 goto error5; 2817 } 2818 2819 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI); 2820 if (ret) 2821 goto error6; 2822 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI); 2823 if (ret) 2824 goto error7; 2825 2826 snprintf(name, sizeof name, "ib_mad%d", port_num); 2827 port_priv->wq = create_singlethread_workqueue(name); 2828 if (!port_priv->wq) { 2829 ret = -ENOMEM; 2830 goto error8; 2831 } 2832 INIT_WORK(&port_priv->work, ib_mad_completion_handler); 2833 2834 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2835 list_add_tail(&port_priv->port_list, &ib_mad_port_list); 2836 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2837 2838 ret = ib_mad_port_start(port_priv); 2839 if (ret) { 2840 printk(KERN_ERR PFX "Couldn't start port\n"); 2841 goto error9; 2842 } 2843 2844 return 0; 2845 2846 error9: 2847 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2848 list_del_init(&port_priv->port_list); 2849 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2850 2851 destroy_workqueue(port_priv->wq); 2852 error8: 2853 destroy_mad_qp(&port_priv->qp_info[1]); 2854 error7: 2855 destroy_mad_qp(&port_priv->qp_info[0]); 2856 error6: 2857 ib_dereg_mr(port_priv->mr); 2858 error5: 2859 ib_dealloc_pd(port_priv->pd); 2860 error4: 2861 ib_destroy_cq(port_priv->cq); 2862 cleanup_recv_queue(&port_priv->qp_info[1]); 2863 cleanup_recv_queue(&port_priv->qp_info[0]); 2864 error3: 2865 kfree(port_priv); 2866 2867 return ret; 2868 } 2869 2870 /* 2871 * Close the port 2872 * If there are no classes using the port, free the port 2873 * resources (CQ, MR, PD, QP) and remove the port's info structure 2874 */ 2875 static int ib_mad_port_close(struct ib_device *device, int port_num) 2876 { 2877 struct ib_mad_port_private *port_priv; 2878 unsigned long flags; 2879 2880 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2881 port_priv = __ib_get_mad_port(device, port_num); 2882 if (port_priv == NULL) { 2883 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2884 printk(KERN_ERR PFX "Port %d not found\n", port_num); 2885 return -ENODEV; 2886 } 2887 list_del_init(&port_priv->port_list); 2888 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2889 2890 destroy_workqueue(port_priv->wq); 2891 destroy_mad_qp(&port_priv->qp_info[1]); 2892 destroy_mad_qp(&port_priv->qp_info[0]); 2893 ib_dereg_mr(port_priv->mr); 2894 ib_dealloc_pd(port_priv->pd); 2895 ib_destroy_cq(port_priv->cq); 2896 cleanup_recv_queue(&port_priv->qp_info[1]); 2897 cleanup_recv_queue(&port_priv->qp_info[0]); 2898 /* XXX: Handle deallocation of MAD registration tables */ 2899 2900 kfree(port_priv); 2901 2902 return 0; 2903 } 2904 2905 static void ib_mad_init_device(struct ib_device *device) 2906 { 2907 int start, end, i; 2908 2909 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 2910 return; 2911 2912 if (device->node_type == RDMA_NODE_IB_SWITCH) { 2913 start = 0; 2914 end = 0; 2915 } else { 2916 start = 1; 2917 end = device->phys_port_cnt; 2918 } 2919 2920 for (i = start; i <= end; i++) { 2921 if (ib_mad_port_open(device, i)) { 2922 printk(KERN_ERR PFX "Couldn't open %s port %d\n", 2923 device->name, i); 2924 goto error; 2925 } 2926 if (ib_agent_port_open(device, i)) { 2927 printk(KERN_ERR PFX "Couldn't open %s port %d " 2928 "for agents\n", 2929 device->name, i); 2930 goto error_agent; 2931 } 2932 } 2933 return; 2934 2935 error_agent: 2936 if (ib_mad_port_close(device, i)) 2937 printk(KERN_ERR PFX "Couldn't close %s port %d\n", 2938 device->name, i); 2939 2940 error: 2941 i--; 2942 2943 while (i >= start) { 2944 if (ib_agent_port_close(device, i)) 2945 printk(KERN_ERR PFX "Couldn't close %s port %d " 2946 "for agents\n", 2947 device->name, i); 2948 if (ib_mad_port_close(device, i)) 2949 printk(KERN_ERR PFX "Couldn't close %s port %d\n", 2950 device->name, i); 2951 i--; 2952 } 2953 } 2954 2955 static void ib_mad_remove_device(struct ib_device *device) 2956 { 2957 int i, num_ports, cur_port; 2958 2959 if (device->node_type == RDMA_NODE_IB_SWITCH) { 2960 num_ports = 1; 2961 cur_port = 0; 2962 } else { 2963 num_ports = device->phys_port_cnt; 2964 cur_port = 1; 2965 } 2966 for (i = 0; i < num_ports; i++, cur_port++) { 2967 if (ib_agent_port_close(device, cur_port)) 2968 printk(KERN_ERR PFX "Couldn't close %s port %d " 2969 "for agents\n", 2970 device->name, cur_port); 2971 if (ib_mad_port_close(device, cur_port)) 2972 printk(KERN_ERR PFX "Couldn't close %s port %d\n", 2973 device->name, cur_port); 2974 } 2975 } 2976 2977 static struct ib_client mad_client = { 2978 .name = "mad", 2979 .add = ib_mad_init_device, 2980 .remove = ib_mad_remove_device 2981 }; 2982 2983 static int __init ib_mad_init_module(void) 2984 { 2985 int ret; 2986 2987 spin_lock_init(&ib_mad_port_list_lock); 2988 2989 ib_mad_cache = kmem_cache_create("ib_mad", 2990 sizeof(struct ib_mad_private), 2991 0, 2992 SLAB_HWCACHE_ALIGN, 2993 NULL); 2994 if (!ib_mad_cache) { 2995 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n"); 2996 ret = -ENOMEM; 2997 goto error1; 2998 } 2999 3000 INIT_LIST_HEAD(&ib_mad_port_list); 3001 3002 if (ib_register_client(&mad_client)) { 3003 printk(KERN_ERR PFX "Couldn't register ib_mad client\n"); 3004 ret = -EINVAL; 3005 goto error2; 3006 } 3007 3008 return 0; 3009 3010 error2: 3011 kmem_cache_destroy(ib_mad_cache); 3012 error1: 3013 return ret; 3014 } 3015 3016 static void __exit ib_mad_cleanup_module(void) 3017 { 3018 ib_unregister_client(&mad_client); 3019 kmem_cache_destroy(ib_mad_cache); 3020 } 3021 3022 module_init(ib_mad_init_module); 3023 module_exit(ib_mad_cleanup_module); 3024 3025