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; 304 305 spin_lock_irqsave(&port_priv->reg_lock, flags); 306 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id; 307 308 /* 309 * Make sure MAD registration (if supplied) 310 * is non overlapping with any existing ones 311 */ 312 if (mad_reg_req) { 313 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class); 314 if (!is_vendor_class(mgmt_class)) { 315 class = port_priv->version[mad_reg_req-> 316 mgmt_class_version].class; 317 if (class) { 318 method = class->method_table[mgmt_class]; 319 if (method) { 320 if (method_in_use(&method, 321 mad_reg_req)) 322 goto error4; 323 } 324 } 325 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv, 326 mgmt_class); 327 } else { 328 /* "New" vendor class range */ 329 vendor = port_priv->version[mad_reg_req-> 330 mgmt_class_version].vendor; 331 if (vendor) { 332 vclass = vendor_class_index(mgmt_class); 333 vendor_class = vendor->vendor_class[vclass]; 334 if (vendor_class) { 335 if (is_vendor_method_in_use( 336 vendor_class, 337 mad_reg_req)) 338 goto error4; 339 } 340 } 341 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv); 342 } 343 if (ret2) { 344 ret = ERR_PTR(ret2); 345 goto error4; 346 } 347 } 348 349 /* Add mad agent into port's agent list */ 350 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list); 351 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 352 353 spin_lock_init(&mad_agent_priv->lock); 354 INIT_LIST_HEAD(&mad_agent_priv->send_list); 355 INIT_LIST_HEAD(&mad_agent_priv->wait_list); 356 INIT_LIST_HEAD(&mad_agent_priv->done_list); 357 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list); 358 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends); 359 INIT_LIST_HEAD(&mad_agent_priv->local_list); 360 INIT_WORK(&mad_agent_priv->local_work, local_completions); 361 atomic_set(&mad_agent_priv->refcount, 1); 362 init_completion(&mad_agent_priv->comp); 363 364 return &mad_agent_priv->agent; 365 366 error4: 367 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 368 kfree(reg_req); 369 error3: 370 ib_dereg_mr(mad_agent_priv->agent.mr); 371 error2: 372 kfree(mad_agent_priv); 373 error1: 374 return ret; 375 } 376 EXPORT_SYMBOL(ib_register_mad_agent); 377 378 static inline int is_snooping_sends(int mad_snoop_flags) 379 { 380 return (mad_snoop_flags & 381 (/*IB_MAD_SNOOP_POSTED_SENDS | 382 IB_MAD_SNOOP_RMPP_SENDS |*/ 383 IB_MAD_SNOOP_SEND_COMPLETIONS /*| 384 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/)); 385 } 386 387 static inline int is_snooping_recvs(int mad_snoop_flags) 388 { 389 return (mad_snoop_flags & 390 (IB_MAD_SNOOP_RECVS /*| 391 IB_MAD_SNOOP_RMPP_RECVS*/)); 392 } 393 394 static int register_snoop_agent(struct ib_mad_qp_info *qp_info, 395 struct ib_mad_snoop_private *mad_snoop_priv) 396 { 397 struct ib_mad_snoop_private **new_snoop_table; 398 unsigned long flags; 399 int i; 400 401 spin_lock_irqsave(&qp_info->snoop_lock, flags); 402 /* Check for empty slot in array. */ 403 for (i = 0; i < qp_info->snoop_table_size; i++) 404 if (!qp_info->snoop_table[i]) 405 break; 406 407 if (i == qp_info->snoop_table_size) { 408 /* Grow table. */ 409 new_snoop_table = krealloc(qp_info->snoop_table, 410 sizeof mad_snoop_priv * 411 (qp_info->snoop_table_size + 1), 412 GFP_ATOMIC); 413 if (!new_snoop_table) { 414 i = -ENOMEM; 415 goto out; 416 } 417 418 qp_info->snoop_table = new_snoop_table; 419 qp_info->snoop_table_size++; 420 } 421 qp_info->snoop_table[i] = mad_snoop_priv; 422 atomic_inc(&qp_info->snoop_count); 423 out: 424 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 425 return i; 426 } 427 428 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device, 429 u8 port_num, 430 enum ib_qp_type qp_type, 431 int mad_snoop_flags, 432 ib_mad_snoop_handler snoop_handler, 433 ib_mad_recv_handler recv_handler, 434 void *context) 435 { 436 struct ib_mad_port_private *port_priv; 437 struct ib_mad_agent *ret; 438 struct ib_mad_snoop_private *mad_snoop_priv; 439 int qpn; 440 441 /* Validate parameters */ 442 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) || 443 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) { 444 ret = ERR_PTR(-EINVAL); 445 goto error1; 446 } 447 qpn = get_spl_qp_index(qp_type); 448 if (qpn == -1) { 449 ret = ERR_PTR(-EINVAL); 450 goto error1; 451 } 452 port_priv = ib_get_mad_port(device, port_num); 453 if (!port_priv) { 454 ret = ERR_PTR(-ENODEV); 455 goto error1; 456 } 457 /* Allocate structures */ 458 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL); 459 if (!mad_snoop_priv) { 460 ret = ERR_PTR(-ENOMEM); 461 goto error1; 462 } 463 464 /* Now, fill in the various structures */ 465 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn]; 466 mad_snoop_priv->agent.device = device; 467 mad_snoop_priv->agent.recv_handler = recv_handler; 468 mad_snoop_priv->agent.snoop_handler = snoop_handler; 469 mad_snoop_priv->agent.context = context; 470 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp; 471 mad_snoop_priv->agent.port_num = port_num; 472 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags; 473 init_completion(&mad_snoop_priv->comp); 474 mad_snoop_priv->snoop_index = register_snoop_agent( 475 &port_priv->qp_info[qpn], 476 mad_snoop_priv); 477 if (mad_snoop_priv->snoop_index < 0) { 478 ret = ERR_PTR(mad_snoop_priv->snoop_index); 479 goto error2; 480 } 481 482 atomic_set(&mad_snoop_priv->refcount, 1); 483 return &mad_snoop_priv->agent; 484 485 error2: 486 kfree(mad_snoop_priv); 487 error1: 488 return ret; 489 } 490 EXPORT_SYMBOL(ib_register_mad_snoop); 491 492 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv) 493 { 494 if (atomic_dec_and_test(&mad_agent_priv->refcount)) 495 complete(&mad_agent_priv->comp); 496 } 497 498 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv) 499 { 500 if (atomic_dec_and_test(&mad_snoop_priv->refcount)) 501 complete(&mad_snoop_priv->comp); 502 } 503 504 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv) 505 { 506 struct ib_mad_port_private *port_priv; 507 unsigned long flags; 508 509 /* Note that we could still be handling received MADs */ 510 511 /* 512 * Canceling all sends results in dropping received response 513 * MADs, preventing us from queuing additional work 514 */ 515 cancel_mads(mad_agent_priv); 516 port_priv = mad_agent_priv->qp_info->port_priv; 517 cancel_delayed_work(&mad_agent_priv->timed_work); 518 519 spin_lock_irqsave(&port_priv->reg_lock, flags); 520 remove_mad_reg_req(mad_agent_priv); 521 list_del(&mad_agent_priv->agent_list); 522 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 523 524 flush_workqueue(port_priv->wq); 525 ib_cancel_rmpp_recvs(mad_agent_priv); 526 527 deref_mad_agent(mad_agent_priv); 528 wait_for_completion(&mad_agent_priv->comp); 529 530 kfree(mad_agent_priv->reg_req); 531 ib_dereg_mr(mad_agent_priv->agent.mr); 532 kfree(mad_agent_priv); 533 } 534 535 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv) 536 { 537 struct ib_mad_qp_info *qp_info; 538 unsigned long flags; 539 540 qp_info = mad_snoop_priv->qp_info; 541 spin_lock_irqsave(&qp_info->snoop_lock, flags); 542 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL; 543 atomic_dec(&qp_info->snoop_count); 544 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 545 546 deref_snoop_agent(mad_snoop_priv); 547 wait_for_completion(&mad_snoop_priv->comp); 548 549 kfree(mad_snoop_priv); 550 } 551 552 /* 553 * ib_unregister_mad_agent - Unregisters a client from using MAD services 554 */ 555 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent) 556 { 557 struct ib_mad_agent_private *mad_agent_priv; 558 struct ib_mad_snoop_private *mad_snoop_priv; 559 560 /* If the TID is zero, the agent can only snoop. */ 561 if (mad_agent->hi_tid) { 562 mad_agent_priv = container_of(mad_agent, 563 struct ib_mad_agent_private, 564 agent); 565 unregister_mad_agent(mad_agent_priv); 566 } else { 567 mad_snoop_priv = container_of(mad_agent, 568 struct ib_mad_snoop_private, 569 agent); 570 unregister_mad_snoop(mad_snoop_priv); 571 } 572 return 0; 573 } 574 EXPORT_SYMBOL(ib_unregister_mad_agent); 575 576 static void dequeue_mad(struct ib_mad_list_head *mad_list) 577 { 578 struct ib_mad_queue *mad_queue; 579 unsigned long flags; 580 581 BUG_ON(!mad_list->mad_queue); 582 mad_queue = mad_list->mad_queue; 583 spin_lock_irqsave(&mad_queue->lock, flags); 584 list_del(&mad_list->list); 585 mad_queue->count--; 586 spin_unlock_irqrestore(&mad_queue->lock, flags); 587 } 588 589 static void snoop_send(struct ib_mad_qp_info *qp_info, 590 struct ib_mad_send_buf *send_buf, 591 struct ib_mad_send_wc *mad_send_wc, 592 int mad_snoop_flags) 593 { 594 struct ib_mad_snoop_private *mad_snoop_priv; 595 unsigned long flags; 596 int i; 597 598 spin_lock_irqsave(&qp_info->snoop_lock, flags); 599 for (i = 0; i < qp_info->snoop_table_size; i++) { 600 mad_snoop_priv = qp_info->snoop_table[i]; 601 if (!mad_snoop_priv || 602 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags)) 603 continue; 604 605 atomic_inc(&mad_snoop_priv->refcount); 606 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 607 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent, 608 send_buf, mad_send_wc); 609 deref_snoop_agent(mad_snoop_priv); 610 spin_lock_irqsave(&qp_info->snoop_lock, flags); 611 } 612 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 613 } 614 615 static void snoop_recv(struct ib_mad_qp_info *qp_info, 616 struct ib_mad_recv_wc *mad_recv_wc, 617 int mad_snoop_flags) 618 { 619 struct ib_mad_snoop_private *mad_snoop_priv; 620 unsigned long flags; 621 int i; 622 623 spin_lock_irqsave(&qp_info->snoop_lock, flags); 624 for (i = 0; i < qp_info->snoop_table_size; i++) { 625 mad_snoop_priv = qp_info->snoop_table[i]; 626 if (!mad_snoop_priv || 627 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags)) 628 continue; 629 630 atomic_inc(&mad_snoop_priv->refcount); 631 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 632 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent, 633 mad_recv_wc); 634 deref_snoop_agent(mad_snoop_priv); 635 spin_lock_irqsave(&qp_info->snoop_lock, flags); 636 } 637 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 638 } 639 640 static void build_smp_wc(struct ib_qp *qp, 641 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num, 642 struct ib_wc *wc) 643 { 644 memset(wc, 0, sizeof *wc); 645 wc->wr_id = wr_id; 646 wc->status = IB_WC_SUCCESS; 647 wc->opcode = IB_WC_RECV; 648 wc->pkey_index = pkey_index; 649 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh); 650 wc->src_qp = IB_QP0; 651 wc->qp = qp; 652 wc->slid = slid; 653 wc->sl = 0; 654 wc->dlid_path_bits = 0; 655 wc->port_num = port_num; 656 } 657 658 /* 659 * Return 0 if SMP is to be sent 660 * Return 1 if SMP was consumed locally (whether or not solicited) 661 * Return < 0 if error 662 */ 663 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv, 664 struct ib_mad_send_wr_private *mad_send_wr) 665 { 666 int ret = 0; 667 struct ib_smp *smp = mad_send_wr->send_buf.mad; 668 unsigned long flags; 669 struct ib_mad_local_private *local; 670 struct ib_mad_private *mad_priv; 671 struct ib_mad_port_private *port_priv; 672 struct ib_mad_agent_private *recv_mad_agent = NULL; 673 struct ib_device *device = mad_agent_priv->agent.device; 674 u8 port_num; 675 struct ib_wc mad_wc; 676 struct ib_send_wr *send_wr = &mad_send_wr->send_wr; 677 678 if (device->node_type == RDMA_NODE_IB_SWITCH && 679 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 680 port_num = send_wr->wr.ud.port_num; 681 else 682 port_num = mad_agent_priv->agent.port_num; 683 684 /* 685 * Directed route handling starts if the initial LID routed part of 686 * a request or the ending LID routed part of a response is empty. 687 * If we are at the start of the LID routed part, don't update the 688 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec. 689 */ 690 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) == 691 IB_LID_PERMISSIVE && 692 smi_handle_dr_smp_send(smp, device->node_type, port_num) == 693 IB_SMI_DISCARD) { 694 ret = -EINVAL; 695 printk(KERN_ERR PFX "Invalid directed route\n"); 696 goto out; 697 } 698 699 /* Check to post send on QP or process locally */ 700 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD && 701 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD) 702 goto out; 703 704 local = kmalloc(sizeof *local, GFP_ATOMIC); 705 if (!local) { 706 ret = -ENOMEM; 707 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n"); 708 goto out; 709 } 710 local->mad_priv = NULL; 711 local->recv_mad_agent = NULL; 712 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC); 713 if (!mad_priv) { 714 ret = -ENOMEM; 715 printk(KERN_ERR PFX "No memory for local response MAD\n"); 716 kfree(local); 717 goto out; 718 } 719 720 build_smp_wc(mad_agent_priv->agent.qp, 721 send_wr->wr_id, be16_to_cpu(smp->dr_slid), 722 send_wr->wr.ud.pkey_index, 723 send_wr->wr.ud.port_num, &mad_wc); 724 725 /* No GRH for DR SMP */ 726 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL, 727 (struct ib_mad *)smp, 728 (struct ib_mad *)&mad_priv->mad); 729 switch (ret) 730 { 731 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY: 732 if (ib_response_mad(&mad_priv->mad.mad) && 733 mad_agent_priv->agent.recv_handler) { 734 local->mad_priv = mad_priv; 735 local->recv_mad_agent = mad_agent_priv; 736 /* 737 * Reference MAD agent until receive 738 * side of local completion handled 739 */ 740 atomic_inc(&mad_agent_priv->refcount); 741 } else 742 kmem_cache_free(ib_mad_cache, mad_priv); 743 break; 744 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED: 745 kmem_cache_free(ib_mad_cache, mad_priv); 746 kfree(local); 747 ret = 1; 748 goto out; 749 case IB_MAD_RESULT_SUCCESS: 750 /* Treat like an incoming receive MAD */ 751 port_priv = ib_get_mad_port(mad_agent_priv->agent.device, 752 mad_agent_priv->agent.port_num); 753 if (port_priv) { 754 memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad)); 755 recv_mad_agent = find_mad_agent(port_priv, 756 &mad_priv->mad.mad); 757 } 758 if (!port_priv || !recv_mad_agent) { 759 kmem_cache_free(ib_mad_cache, mad_priv); 760 kfree(local); 761 ret = 0; 762 goto out; 763 } 764 local->mad_priv = mad_priv; 765 local->recv_mad_agent = recv_mad_agent; 766 break; 767 default: 768 kmem_cache_free(ib_mad_cache, mad_priv); 769 kfree(local); 770 ret = -EINVAL; 771 goto out; 772 } 773 774 local->mad_send_wr = mad_send_wr; 775 /* Reference MAD agent until send side of local completion handled */ 776 atomic_inc(&mad_agent_priv->refcount); 777 /* Queue local completion to local list */ 778 spin_lock_irqsave(&mad_agent_priv->lock, flags); 779 list_add_tail(&local->completion_list, &mad_agent_priv->local_list); 780 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 781 queue_work(mad_agent_priv->qp_info->port_priv->wq, 782 &mad_agent_priv->local_work); 783 ret = 1; 784 out: 785 return ret; 786 } 787 788 static int get_pad_size(int hdr_len, int data_len) 789 { 790 int seg_size, pad; 791 792 seg_size = sizeof(struct ib_mad) - hdr_len; 793 if (data_len && seg_size) { 794 pad = seg_size - data_len % seg_size; 795 return pad == seg_size ? 0 : pad; 796 } else 797 return seg_size; 798 } 799 800 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr) 801 { 802 struct ib_rmpp_segment *s, *t; 803 804 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) { 805 list_del(&s->list); 806 kfree(s); 807 } 808 } 809 810 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr, 811 gfp_t gfp_mask) 812 { 813 struct ib_mad_send_buf *send_buf = &send_wr->send_buf; 814 struct ib_rmpp_mad *rmpp_mad = send_buf->mad; 815 struct ib_rmpp_segment *seg = NULL; 816 int left, seg_size, pad; 817 818 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len; 819 seg_size = send_buf->seg_size; 820 pad = send_wr->pad; 821 822 /* Allocate data segments. */ 823 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) { 824 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask); 825 if (!seg) { 826 printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem " 827 "alloc failed for len %zd, gfp %#x\n", 828 sizeof (*seg) + seg_size, gfp_mask); 829 free_send_rmpp_list(send_wr); 830 return -ENOMEM; 831 } 832 seg->num = ++send_buf->seg_count; 833 list_add_tail(&seg->list, &send_wr->rmpp_list); 834 } 835 836 /* Zero any padding */ 837 if (pad) 838 memset(seg->data + seg_size - pad, 0, pad); 839 840 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv-> 841 agent.rmpp_version; 842 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA; 843 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 844 845 send_wr->cur_seg = container_of(send_wr->rmpp_list.next, 846 struct ib_rmpp_segment, list); 847 send_wr->last_ack_seg = send_wr->cur_seg; 848 return 0; 849 } 850 851 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent, 852 u32 remote_qpn, u16 pkey_index, 853 int rmpp_active, 854 int hdr_len, int data_len, 855 gfp_t gfp_mask) 856 { 857 struct ib_mad_agent_private *mad_agent_priv; 858 struct ib_mad_send_wr_private *mad_send_wr; 859 int pad, message_size, ret, size; 860 void *buf; 861 862 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, 863 agent); 864 pad = get_pad_size(hdr_len, data_len); 865 message_size = hdr_len + data_len + pad; 866 867 if ((!mad_agent->rmpp_version && 868 (rmpp_active || message_size > sizeof(struct ib_mad))) || 869 (!rmpp_active && message_size > sizeof(struct ib_mad))) 870 return ERR_PTR(-EINVAL); 871 872 size = rmpp_active ? hdr_len : sizeof(struct ib_mad); 873 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask); 874 if (!buf) 875 return ERR_PTR(-ENOMEM); 876 877 mad_send_wr = buf + size; 878 INIT_LIST_HEAD(&mad_send_wr->rmpp_list); 879 mad_send_wr->send_buf.mad = buf; 880 mad_send_wr->send_buf.hdr_len = hdr_len; 881 mad_send_wr->send_buf.data_len = data_len; 882 mad_send_wr->pad = pad; 883 884 mad_send_wr->mad_agent_priv = mad_agent_priv; 885 mad_send_wr->sg_list[0].length = hdr_len; 886 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey; 887 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len; 888 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey; 889 890 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr; 891 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list; 892 mad_send_wr->send_wr.num_sge = 2; 893 mad_send_wr->send_wr.opcode = IB_WR_SEND; 894 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED; 895 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn; 896 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY; 897 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index; 898 899 if (rmpp_active) { 900 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask); 901 if (ret) { 902 kfree(buf); 903 return ERR_PTR(ret); 904 } 905 } 906 907 mad_send_wr->send_buf.mad_agent = mad_agent; 908 atomic_inc(&mad_agent_priv->refcount); 909 return &mad_send_wr->send_buf; 910 } 911 EXPORT_SYMBOL(ib_create_send_mad); 912 913 int ib_get_mad_data_offset(u8 mgmt_class) 914 { 915 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM) 916 return IB_MGMT_SA_HDR; 917 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) || 918 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) || 919 (mgmt_class == IB_MGMT_CLASS_BIS)) 920 return IB_MGMT_DEVICE_HDR; 921 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && 922 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)) 923 return IB_MGMT_VENDOR_HDR; 924 else 925 return IB_MGMT_MAD_HDR; 926 } 927 EXPORT_SYMBOL(ib_get_mad_data_offset); 928 929 int ib_is_mad_class_rmpp(u8 mgmt_class) 930 { 931 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) || 932 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) || 933 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) || 934 (mgmt_class == IB_MGMT_CLASS_BIS) || 935 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && 936 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))) 937 return 1; 938 return 0; 939 } 940 EXPORT_SYMBOL(ib_is_mad_class_rmpp); 941 942 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num) 943 { 944 struct ib_mad_send_wr_private *mad_send_wr; 945 struct list_head *list; 946 947 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private, 948 send_buf); 949 list = &mad_send_wr->cur_seg->list; 950 951 if (mad_send_wr->cur_seg->num < seg_num) { 952 list_for_each_entry(mad_send_wr->cur_seg, list, list) 953 if (mad_send_wr->cur_seg->num == seg_num) 954 break; 955 } else if (mad_send_wr->cur_seg->num > seg_num) { 956 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list) 957 if (mad_send_wr->cur_seg->num == seg_num) 958 break; 959 } 960 return mad_send_wr->cur_seg->data; 961 } 962 EXPORT_SYMBOL(ib_get_rmpp_segment); 963 964 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr) 965 { 966 if (mad_send_wr->send_buf.seg_count) 967 return ib_get_rmpp_segment(&mad_send_wr->send_buf, 968 mad_send_wr->seg_num); 969 else 970 return mad_send_wr->send_buf.mad + 971 mad_send_wr->send_buf.hdr_len; 972 } 973 974 void ib_free_send_mad(struct ib_mad_send_buf *send_buf) 975 { 976 struct ib_mad_agent_private *mad_agent_priv; 977 struct ib_mad_send_wr_private *mad_send_wr; 978 979 mad_agent_priv = container_of(send_buf->mad_agent, 980 struct ib_mad_agent_private, agent); 981 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private, 982 send_buf); 983 984 free_send_rmpp_list(mad_send_wr); 985 kfree(send_buf->mad); 986 deref_mad_agent(mad_agent_priv); 987 } 988 EXPORT_SYMBOL(ib_free_send_mad); 989 990 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr) 991 { 992 struct ib_mad_qp_info *qp_info; 993 struct list_head *list; 994 struct ib_send_wr *bad_send_wr; 995 struct ib_mad_agent *mad_agent; 996 struct ib_sge *sge; 997 unsigned long flags; 998 int ret; 999 1000 /* Set WR ID to find mad_send_wr upon completion */ 1001 qp_info = mad_send_wr->mad_agent_priv->qp_info; 1002 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list; 1003 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue; 1004 1005 mad_agent = mad_send_wr->send_buf.mad_agent; 1006 sge = mad_send_wr->sg_list; 1007 sge[0].addr = ib_dma_map_single(mad_agent->device, 1008 mad_send_wr->send_buf.mad, 1009 sge[0].length, 1010 DMA_TO_DEVICE); 1011 mad_send_wr->header_mapping = sge[0].addr; 1012 1013 sge[1].addr = ib_dma_map_single(mad_agent->device, 1014 ib_get_payload(mad_send_wr), 1015 sge[1].length, 1016 DMA_TO_DEVICE); 1017 mad_send_wr->payload_mapping = sge[1].addr; 1018 1019 spin_lock_irqsave(&qp_info->send_queue.lock, flags); 1020 if (qp_info->send_queue.count < qp_info->send_queue.max_active) { 1021 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr, 1022 &bad_send_wr); 1023 list = &qp_info->send_queue.list; 1024 } else { 1025 ret = 0; 1026 list = &qp_info->overflow_list; 1027 } 1028 1029 if (!ret) { 1030 qp_info->send_queue.count++; 1031 list_add_tail(&mad_send_wr->mad_list.list, list); 1032 } 1033 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); 1034 if (ret) { 1035 ib_dma_unmap_single(mad_agent->device, 1036 mad_send_wr->header_mapping, 1037 sge[0].length, DMA_TO_DEVICE); 1038 ib_dma_unmap_single(mad_agent->device, 1039 mad_send_wr->payload_mapping, 1040 sge[1].length, DMA_TO_DEVICE); 1041 } 1042 return ret; 1043 } 1044 1045 /* 1046 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated 1047 * with the registered client 1048 */ 1049 int ib_post_send_mad(struct ib_mad_send_buf *send_buf, 1050 struct ib_mad_send_buf **bad_send_buf) 1051 { 1052 struct ib_mad_agent_private *mad_agent_priv; 1053 struct ib_mad_send_buf *next_send_buf; 1054 struct ib_mad_send_wr_private *mad_send_wr; 1055 unsigned long flags; 1056 int ret = -EINVAL; 1057 1058 /* Walk list of send WRs and post each on send list */ 1059 for (; send_buf; send_buf = next_send_buf) { 1060 1061 mad_send_wr = container_of(send_buf, 1062 struct ib_mad_send_wr_private, 1063 send_buf); 1064 mad_agent_priv = mad_send_wr->mad_agent_priv; 1065 1066 if (!send_buf->mad_agent->send_handler || 1067 (send_buf->timeout_ms && 1068 !send_buf->mad_agent->recv_handler)) { 1069 ret = -EINVAL; 1070 goto error; 1071 } 1072 1073 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) { 1074 if (mad_agent_priv->agent.rmpp_version) { 1075 ret = -EINVAL; 1076 goto error; 1077 } 1078 } 1079 1080 /* 1081 * Save pointer to next work request to post in case the 1082 * current one completes, and the user modifies the work 1083 * request associated with the completion 1084 */ 1085 next_send_buf = send_buf->next; 1086 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah; 1087 1088 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class == 1089 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 1090 ret = handle_outgoing_dr_smp(mad_agent_priv, 1091 mad_send_wr); 1092 if (ret < 0) /* error */ 1093 goto error; 1094 else if (ret == 1) /* locally consumed */ 1095 continue; 1096 } 1097 1098 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid; 1099 /* Timeout will be updated after send completes */ 1100 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms); 1101 mad_send_wr->max_retries = send_buf->retries; 1102 mad_send_wr->retries_left = send_buf->retries; 1103 send_buf->retries = 0; 1104 /* Reference for work request to QP + response */ 1105 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0); 1106 mad_send_wr->status = IB_WC_SUCCESS; 1107 1108 /* Reference MAD agent until send completes */ 1109 atomic_inc(&mad_agent_priv->refcount); 1110 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1111 list_add_tail(&mad_send_wr->agent_list, 1112 &mad_agent_priv->send_list); 1113 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1114 1115 if (mad_agent_priv->agent.rmpp_version) { 1116 ret = ib_send_rmpp_mad(mad_send_wr); 1117 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED) 1118 ret = ib_send_mad(mad_send_wr); 1119 } else 1120 ret = ib_send_mad(mad_send_wr); 1121 if (ret < 0) { 1122 /* Fail send request */ 1123 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1124 list_del(&mad_send_wr->agent_list); 1125 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1126 atomic_dec(&mad_agent_priv->refcount); 1127 goto error; 1128 } 1129 } 1130 return 0; 1131 error: 1132 if (bad_send_buf) 1133 *bad_send_buf = send_buf; 1134 return ret; 1135 } 1136 EXPORT_SYMBOL(ib_post_send_mad); 1137 1138 /* 1139 * ib_free_recv_mad - Returns data buffers used to receive 1140 * a MAD to the access layer 1141 */ 1142 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc) 1143 { 1144 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf; 1145 struct ib_mad_private_header *mad_priv_hdr; 1146 struct ib_mad_private *priv; 1147 struct list_head free_list; 1148 1149 INIT_LIST_HEAD(&free_list); 1150 list_splice_init(&mad_recv_wc->rmpp_list, &free_list); 1151 1152 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf, 1153 &free_list, list) { 1154 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc, 1155 recv_buf); 1156 mad_priv_hdr = container_of(mad_recv_wc, 1157 struct ib_mad_private_header, 1158 recv_wc); 1159 priv = container_of(mad_priv_hdr, struct ib_mad_private, 1160 header); 1161 kmem_cache_free(ib_mad_cache, priv); 1162 } 1163 } 1164 EXPORT_SYMBOL(ib_free_recv_mad); 1165 1166 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp, 1167 u8 rmpp_version, 1168 ib_mad_send_handler send_handler, 1169 ib_mad_recv_handler recv_handler, 1170 void *context) 1171 { 1172 return ERR_PTR(-EINVAL); /* XXX: for now */ 1173 } 1174 EXPORT_SYMBOL(ib_redirect_mad_qp); 1175 1176 int ib_process_mad_wc(struct ib_mad_agent *mad_agent, 1177 struct ib_wc *wc) 1178 { 1179 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n"); 1180 return 0; 1181 } 1182 EXPORT_SYMBOL(ib_process_mad_wc); 1183 1184 static int method_in_use(struct ib_mad_mgmt_method_table **method, 1185 struct ib_mad_reg_req *mad_reg_req) 1186 { 1187 int i; 1188 1189 for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS); 1190 i < IB_MGMT_MAX_METHODS; 1191 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS, 1192 1+i)) { 1193 if ((*method)->agent[i]) { 1194 printk(KERN_ERR PFX "Method %d already in use\n", i); 1195 return -EINVAL; 1196 } 1197 } 1198 return 0; 1199 } 1200 1201 static int allocate_method_table(struct ib_mad_mgmt_method_table **method) 1202 { 1203 /* Allocate management method table */ 1204 *method = kzalloc(sizeof **method, GFP_ATOMIC); 1205 if (!*method) { 1206 printk(KERN_ERR PFX "No memory for " 1207 "ib_mad_mgmt_method_table\n"); 1208 return -ENOMEM; 1209 } 1210 1211 return 0; 1212 } 1213 1214 /* 1215 * Check to see if there are any methods still in use 1216 */ 1217 static int check_method_table(struct ib_mad_mgmt_method_table *method) 1218 { 1219 int i; 1220 1221 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) 1222 if (method->agent[i]) 1223 return 1; 1224 return 0; 1225 } 1226 1227 /* 1228 * Check to see if there are any method tables for this class still in use 1229 */ 1230 static int check_class_table(struct ib_mad_mgmt_class_table *class) 1231 { 1232 int i; 1233 1234 for (i = 0; i < MAX_MGMT_CLASS; i++) 1235 if (class->method_table[i]) 1236 return 1; 1237 return 0; 1238 } 1239 1240 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class) 1241 { 1242 int i; 1243 1244 for (i = 0; i < MAX_MGMT_OUI; i++) 1245 if (vendor_class->method_table[i]) 1246 return 1; 1247 return 0; 1248 } 1249 1250 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class, 1251 char *oui) 1252 { 1253 int i; 1254 1255 for (i = 0; i < MAX_MGMT_OUI; i++) 1256 /* Is there matching OUI for this vendor class ? */ 1257 if (!memcmp(vendor_class->oui[i], oui, 3)) 1258 return i; 1259 1260 return -1; 1261 } 1262 1263 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor) 1264 { 1265 int i; 1266 1267 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++) 1268 if (vendor->vendor_class[i]) 1269 return 1; 1270 1271 return 0; 1272 } 1273 1274 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method, 1275 struct ib_mad_agent_private *agent) 1276 { 1277 int i; 1278 1279 /* Remove any methods for this mad agent */ 1280 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) { 1281 if (method->agent[i] == agent) { 1282 method->agent[i] = NULL; 1283 } 1284 } 1285 } 1286 1287 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req, 1288 struct ib_mad_agent_private *agent_priv, 1289 u8 mgmt_class) 1290 { 1291 struct ib_mad_port_private *port_priv; 1292 struct ib_mad_mgmt_class_table **class; 1293 struct ib_mad_mgmt_method_table **method; 1294 int i, ret; 1295 1296 port_priv = agent_priv->qp_info->port_priv; 1297 class = &port_priv->version[mad_reg_req->mgmt_class_version].class; 1298 if (!*class) { 1299 /* Allocate management class table for "new" class version */ 1300 *class = kzalloc(sizeof **class, GFP_ATOMIC); 1301 if (!*class) { 1302 printk(KERN_ERR PFX "No memory for " 1303 "ib_mad_mgmt_class_table\n"); 1304 ret = -ENOMEM; 1305 goto error1; 1306 } 1307 1308 /* Allocate method table for this management class */ 1309 method = &(*class)->method_table[mgmt_class]; 1310 if ((ret = allocate_method_table(method))) 1311 goto error2; 1312 } else { 1313 method = &(*class)->method_table[mgmt_class]; 1314 if (!*method) { 1315 /* Allocate method table for this management class */ 1316 if ((ret = allocate_method_table(method))) 1317 goto error1; 1318 } 1319 } 1320 1321 /* Now, make sure methods are not already in use */ 1322 if (method_in_use(method, mad_reg_req)) 1323 goto error3; 1324 1325 /* Finally, add in methods being registered */ 1326 for (i = find_first_bit(mad_reg_req->method_mask, 1327 IB_MGMT_MAX_METHODS); 1328 i < IB_MGMT_MAX_METHODS; 1329 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS, 1330 1+i)) { 1331 (*method)->agent[i] = agent_priv; 1332 } 1333 return 0; 1334 1335 error3: 1336 /* Remove any methods for this mad agent */ 1337 remove_methods_mad_agent(*method, agent_priv); 1338 /* Now, check to see if there are any methods in use */ 1339 if (!check_method_table(*method)) { 1340 /* If not, release management method table */ 1341 kfree(*method); 1342 *method = NULL; 1343 } 1344 ret = -EINVAL; 1345 goto error1; 1346 error2: 1347 kfree(*class); 1348 *class = NULL; 1349 error1: 1350 return ret; 1351 } 1352 1353 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req, 1354 struct ib_mad_agent_private *agent_priv) 1355 { 1356 struct ib_mad_port_private *port_priv; 1357 struct ib_mad_mgmt_vendor_class_table **vendor_table; 1358 struct ib_mad_mgmt_vendor_class_table *vendor = NULL; 1359 struct ib_mad_mgmt_vendor_class *vendor_class = NULL; 1360 struct ib_mad_mgmt_method_table **method; 1361 int i, ret = -ENOMEM; 1362 u8 vclass; 1363 1364 /* "New" vendor (with OUI) class */ 1365 vclass = vendor_class_index(mad_reg_req->mgmt_class); 1366 port_priv = agent_priv->qp_info->port_priv; 1367 vendor_table = &port_priv->version[ 1368 mad_reg_req->mgmt_class_version].vendor; 1369 if (!*vendor_table) { 1370 /* Allocate mgmt vendor class table for "new" class version */ 1371 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC); 1372 if (!vendor) { 1373 printk(KERN_ERR PFX "No memory for " 1374 "ib_mad_mgmt_vendor_class_table\n"); 1375 goto error1; 1376 } 1377 1378 *vendor_table = vendor; 1379 } 1380 if (!(*vendor_table)->vendor_class[vclass]) { 1381 /* Allocate table for this management vendor class */ 1382 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC); 1383 if (!vendor_class) { 1384 printk(KERN_ERR PFX "No memory for " 1385 "ib_mad_mgmt_vendor_class\n"); 1386 goto error2; 1387 } 1388 1389 (*vendor_table)->vendor_class[vclass] = vendor_class; 1390 } 1391 for (i = 0; i < MAX_MGMT_OUI; i++) { 1392 /* Is there matching OUI for this vendor class ? */ 1393 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i], 1394 mad_reg_req->oui, 3)) { 1395 method = &(*vendor_table)->vendor_class[ 1396 vclass]->method_table[i]; 1397 BUG_ON(!*method); 1398 goto check_in_use; 1399 } 1400 } 1401 for (i = 0; i < MAX_MGMT_OUI; i++) { 1402 /* OUI slot available ? */ 1403 if (!is_vendor_oui((*vendor_table)->vendor_class[ 1404 vclass]->oui[i])) { 1405 method = &(*vendor_table)->vendor_class[ 1406 vclass]->method_table[i]; 1407 BUG_ON(*method); 1408 /* Allocate method table for this OUI */ 1409 if ((ret = allocate_method_table(method))) 1410 goto error3; 1411 memcpy((*vendor_table)->vendor_class[vclass]->oui[i], 1412 mad_reg_req->oui, 3); 1413 goto check_in_use; 1414 } 1415 } 1416 printk(KERN_ERR PFX "All OUI slots in use\n"); 1417 goto error3; 1418 1419 check_in_use: 1420 /* Now, make sure methods are not already in use */ 1421 if (method_in_use(method, mad_reg_req)) 1422 goto error4; 1423 1424 /* Finally, add in methods being registered */ 1425 for (i = find_first_bit(mad_reg_req->method_mask, 1426 IB_MGMT_MAX_METHODS); 1427 i < IB_MGMT_MAX_METHODS; 1428 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS, 1429 1+i)) { 1430 (*method)->agent[i] = agent_priv; 1431 } 1432 return 0; 1433 1434 error4: 1435 /* Remove any methods for this mad agent */ 1436 remove_methods_mad_agent(*method, agent_priv); 1437 /* Now, check to see if there are any methods in use */ 1438 if (!check_method_table(*method)) { 1439 /* If not, release management method table */ 1440 kfree(*method); 1441 *method = NULL; 1442 } 1443 ret = -EINVAL; 1444 error3: 1445 if (vendor_class) { 1446 (*vendor_table)->vendor_class[vclass] = NULL; 1447 kfree(vendor_class); 1448 } 1449 error2: 1450 if (vendor) { 1451 *vendor_table = NULL; 1452 kfree(vendor); 1453 } 1454 error1: 1455 return ret; 1456 } 1457 1458 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv) 1459 { 1460 struct ib_mad_port_private *port_priv; 1461 struct ib_mad_mgmt_class_table *class; 1462 struct ib_mad_mgmt_method_table *method; 1463 struct ib_mad_mgmt_vendor_class_table *vendor; 1464 struct ib_mad_mgmt_vendor_class *vendor_class; 1465 int index; 1466 u8 mgmt_class; 1467 1468 /* 1469 * Was MAD registration request supplied 1470 * with original registration ? 1471 */ 1472 if (!agent_priv->reg_req) { 1473 goto out; 1474 } 1475 1476 port_priv = agent_priv->qp_info->port_priv; 1477 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class); 1478 class = port_priv->version[ 1479 agent_priv->reg_req->mgmt_class_version].class; 1480 if (!class) 1481 goto vendor_check; 1482 1483 method = class->method_table[mgmt_class]; 1484 if (method) { 1485 /* Remove any methods for this mad agent */ 1486 remove_methods_mad_agent(method, agent_priv); 1487 /* Now, check to see if there are any methods still in use */ 1488 if (!check_method_table(method)) { 1489 /* If not, release management method table */ 1490 kfree(method); 1491 class->method_table[mgmt_class] = NULL; 1492 /* Any management classes left ? */ 1493 if (!check_class_table(class)) { 1494 /* If not, release management class table */ 1495 kfree(class); 1496 port_priv->version[ 1497 agent_priv->reg_req-> 1498 mgmt_class_version].class = NULL; 1499 } 1500 } 1501 } 1502 1503 vendor_check: 1504 if (!is_vendor_class(mgmt_class)) 1505 goto out; 1506 1507 /* normalize mgmt_class to vendor range 2 */ 1508 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class); 1509 vendor = port_priv->version[ 1510 agent_priv->reg_req->mgmt_class_version].vendor; 1511 1512 if (!vendor) 1513 goto out; 1514 1515 vendor_class = vendor->vendor_class[mgmt_class]; 1516 if (vendor_class) { 1517 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui); 1518 if (index < 0) 1519 goto out; 1520 method = vendor_class->method_table[index]; 1521 if (method) { 1522 /* Remove any methods for this mad agent */ 1523 remove_methods_mad_agent(method, agent_priv); 1524 /* 1525 * Now, check to see if there are 1526 * any methods still in use 1527 */ 1528 if (!check_method_table(method)) { 1529 /* If not, release management method table */ 1530 kfree(method); 1531 vendor_class->method_table[index] = NULL; 1532 memset(vendor_class->oui[index], 0, 3); 1533 /* Any OUIs left ? */ 1534 if (!check_vendor_class(vendor_class)) { 1535 /* If not, release vendor class table */ 1536 kfree(vendor_class); 1537 vendor->vendor_class[mgmt_class] = NULL; 1538 /* Any other vendor classes left ? */ 1539 if (!check_vendor_table(vendor)) { 1540 kfree(vendor); 1541 port_priv->version[ 1542 agent_priv->reg_req-> 1543 mgmt_class_version]. 1544 vendor = NULL; 1545 } 1546 } 1547 } 1548 } 1549 } 1550 1551 out: 1552 return; 1553 } 1554 1555 static struct ib_mad_agent_private * 1556 find_mad_agent(struct ib_mad_port_private *port_priv, 1557 struct ib_mad *mad) 1558 { 1559 struct ib_mad_agent_private *mad_agent = NULL; 1560 unsigned long flags; 1561 1562 spin_lock_irqsave(&port_priv->reg_lock, flags); 1563 if (ib_response_mad(mad)) { 1564 u32 hi_tid; 1565 struct ib_mad_agent_private *entry; 1566 1567 /* 1568 * Routing is based on high 32 bits of transaction ID 1569 * of MAD. 1570 */ 1571 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32; 1572 list_for_each_entry(entry, &port_priv->agent_list, agent_list) { 1573 if (entry->agent.hi_tid == hi_tid) { 1574 mad_agent = entry; 1575 break; 1576 } 1577 } 1578 } else { 1579 struct ib_mad_mgmt_class_table *class; 1580 struct ib_mad_mgmt_method_table *method; 1581 struct ib_mad_mgmt_vendor_class_table *vendor; 1582 struct ib_mad_mgmt_vendor_class *vendor_class; 1583 struct ib_vendor_mad *vendor_mad; 1584 int index; 1585 1586 /* 1587 * Routing is based on version, class, and method 1588 * For "newer" vendor MADs, also based on OUI 1589 */ 1590 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION) 1591 goto out; 1592 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) { 1593 class = port_priv->version[ 1594 mad->mad_hdr.class_version].class; 1595 if (!class) 1596 goto out; 1597 method = class->method_table[convert_mgmt_class( 1598 mad->mad_hdr.mgmt_class)]; 1599 if (method) 1600 mad_agent = method->agent[mad->mad_hdr.method & 1601 ~IB_MGMT_METHOD_RESP]; 1602 } else { 1603 vendor = port_priv->version[ 1604 mad->mad_hdr.class_version].vendor; 1605 if (!vendor) 1606 goto out; 1607 vendor_class = vendor->vendor_class[vendor_class_index( 1608 mad->mad_hdr.mgmt_class)]; 1609 if (!vendor_class) 1610 goto out; 1611 /* Find matching OUI */ 1612 vendor_mad = (struct ib_vendor_mad *)mad; 1613 index = find_vendor_oui(vendor_class, vendor_mad->oui); 1614 if (index == -1) 1615 goto out; 1616 method = vendor_class->method_table[index]; 1617 if (method) { 1618 mad_agent = method->agent[mad->mad_hdr.method & 1619 ~IB_MGMT_METHOD_RESP]; 1620 } 1621 } 1622 } 1623 1624 if (mad_agent) { 1625 if (mad_agent->agent.recv_handler) 1626 atomic_inc(&mad_agent->refcount); 1627 else { 1628 printk(KERN_NOTICE PFX "No receive handler for client " 1629 "%p on port %d\n", 1630 &mad_agent->agent, port_priv->port_num); 1631 mad_agent = NULL; 1632 } 1633 } 1634 out: 1635 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 1636 1637 return mad_agent; 1638 } 1639 1640 static int validate_mad(struct ib_mad *mad, u32 qp_num) 1641 { 1642 int valid = 0; 1643 1644 /* Make sure MAD base version is understood */ 1645 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) { 1646 printk(KERN_ERR PFX "MAD received with unsupported base " 1647 "version %d\n", mad->mad_hdr.base_version); 1648 goto out; 1649 } 1650 1651 /* Filter SMI packets sent to other than QP0 */ 1652 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) || 1653 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) { 1654 if (qp_num == 0) 1655 valid = 1; 1656 } else { 1657 /* Filter GSI packets sent to QP0 */ 1658 if (qp_num != 0) 1659 valid = 1; 1660 } 1661 1662 out: 1663 return valid; 1664 } 1665 1666 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv, 1667 struct ib_mad_hdr *mad_hdr) 1668 { 1669 struct ib_rmpp_mad *rmpp_mad; 1670 1671 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr; 1672 return !mad_agent_priv->agent.rmpp_version || 1673 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 1674 IB_MGMT_RMPP_FLAG_ACTIVE) || 1675 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA); 1676 } 1677 1678 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr, 1679 struct ib_mad_recv_wc *rwc) 1680 { 1681 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class == 1682 rwc->recv_buf.mad->mad_hdr.mgmt_class; 1683 } 1684 1685 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv, 1686 struct ib_mad_send_wr_private *wr, 1687 struct ib_mad_recv_wc *rwc ) 1688 { 1689 struct ib_ah_attr attr; 1690 u8 send_resp, rcv_resp; 1691 union ib_gid sgid; 1692 struct ib_device *device = mad_agent_priv->agent.device; 1693 u8 port_num = mad_agent_priv->agent.port_num; 1694 u8 lmc; 1695 1696 send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad); 1697 rcv_resp = ib_response_mad(rwc->recv_buf.mad); 1698 1699 if (send_resp == rcv_resp) 1700 /* both requests, or both responses. GIDs different */ 1701 return 0; 1702 1703 if (ib_query_ah(wr->send_buf.ah, &attr)) 1704 /* Assume not equal, to avoid false positives. */ 1705 return 0; 1706 1707 if (!!(attr.ah_flags & IB_AH_GRH) != 1708 !!(rwc->wc->wc_flags & IB_WC_GRH)) 1709 /* one has GID, other does not. Assume different */ 1710 return 0; 1711 1712 if (!send_resp && rcv_resp) { 1713 /* is request/response. */ 1714 if (!(attr.ah_flags & IB_AH_GRH)) { 1715 if (ib_get_cached_lmc(device, port_num, &lmc)) 1716 return 0; 1717 return (!lmc || !((attr.src_path_bits ^ 1718 rwc->wc->dlid_path_bits) & 1719 ((1 << lmc) - 1))); 1720 } else { 1721 if (ib_get_cached_gid(device, port_num, 1722 attr.grh.sgid_index, &sgid)) 1723 return 0; 1724 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw, 1725 16); 1726 } 1727 } 1728 1729 if (!(attr.ah_flags & IB_AH_GRH)) 1730 return attr.dlid == rwc->wc->slid; 1731 else 1732 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw, 1733 16); 1734 } 1735 1736 static inline int is_direct(u8 class) 1737 { 1738 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE); 1739 } 1740 1741 struct ib_mad_send_wr_private* 1742 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv, 1743 struct ib_mad_recv_wc *wc) 1744 { 1745 struct ib_mad_send_wr_private *wr; 1746 struct ib_mad *mad; 1747 1748 mad = (struct ib_mad *)wc->recv_buf.mad; 1749 1750 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) { 1751 if ((wr->tid == mad->mad_hdr.tid) && 1752 rcv_has_same_class(wr, wc) && 1753 /* 1754 * Don't check GID for direct routed MADs. 1755 * These might have permissive LIDs. 1756 */ 1757 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) || 1758 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1759 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1760 } 1761 1762 /* 1763 * It's possible to receive the response before we've 1764 * been notified that the send has completed 1765 */ 1766 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) { 1767 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) && 1768 wr->tid == mad->mad_hdr.tid && 1769 wr->timeout && 1770 rcv_has_same_class(wr, wc) && 1771 /* 1772 * Don't check GID for direct routed MADs. 1773 * These might have permissive LIDs. 1774 */ 1775 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) || 1776 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1777 /* Verify request has not been canceled */ 1778 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1779 } 1780 return NULL; 1781 } 1782 1783 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr) 1784 { 1785 mad_send_wr->timeout = 0; 1786 if (mad_send_wr->refcount == 1) 1787 list_move_tail(&mad_send_wr->agent_list, 1788 &mad_send_wr->mad_agent_priv->done_list); 1789 } 1790 1791 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv, 1792 struct ib_mad_recv_wc *mad_recv_wc) 1793 { 1794 struct ib_mad_send_wr_private *mad_send_wr; 1795 struct ib_mad_send_wc mad_send_wc; 1796 unsigned long flags; 1797 1798 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list); 1799 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list); 1800 if (mad_agent_priv->agent.rmpp_version) { 1801 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv, 1802 mad_recv_wc); 1803 if (!mad_recv_wc) { 1804 deref_mad_agent(mad_agent_priv); 1805 return; 1806 } 1807 } 1808 1809 /* Complete corresponding request */ 1810 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) { 1811 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1812 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc); 1813 if (!mad_send_wr) { 1814 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1815 ib_free_recv_mad(mad_recv_wc); 1816 deref_mad_agent(mad_agent_priv); 1817 return; 1818 } 1819 ib_mark_mad_done(mad_send_wr); 1820 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1821 1822 /* Defined behavior is to complete response before request */ 1823 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf; 1824 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, 1825 mad_recv_wc); 1826 atomic_dec(&mad_agent_priv->refcount); 1827 1828 mad_send_wc.status = IB_WC_SUCCESS; 1829 mad_send_wc.vendor_err = 0; 1830 mad_send_wc.send_buf = &mad_send_wr->send_buf; 1831 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 1832 } else { 1833 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, 1834 mad_recv_wc); 1835 deref_mad_agent(mad_agent_priv); 1836 } 1837 } 1838 1839 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv, 1840 struct ib_wc *wc) 1841 { 1842 struct ib_mad_qp_info *qp_info; 1843 struct ib_mad_private_header *mad_priv_hdr; 1844 struct ib_mad_private *recv, *response = NULL; 1845 struct ib_mad_list_head *mad_list; 1846 struct ib_mad_agent_private *mad_agent; 1847 int port_num; 1848 1849 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 1850 qp_info = mad_list->mad_queue->qp_info; 1851 dequeue_mad(mad_list); 1852 1853 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header, 1854 mad_list); 1855 recv = container_of(mad_priv_hdr, struct ib_mad_private, header); 1856 ib_dma_unmap_single(port_priv->device, 1857 recv->header.mapping, 1858 sizeof(struct ib_mad_private) - 1859 sizeof(struct ib_mad_private_header), 1860 DMA_FROM_DEVICE); 1861 1862 /* Setup MAD receive work completion from "normal" work completion */ 1863 recv->header.wc = *wc; 1864 recv->header.recv_wc.wc = &recv->header.wc; 1865 recv->header.recv_wc.mad_len = sizeof(struct ib_mad); 1866 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad; 1867 recv->header.recv_wc.recv_buf.grh = &recv->grh; 1868 1869 if (atomic_read(&qp_info->snoop_count)) 1870 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS); 1871 1872 /* Validate MAD */ 1873 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num)) 1874 goto out; 1875 1876 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL); 1877 if (!response) { 1878 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory " 1879 "for response buffer\n"); 1880 goto out; 1881 } 1882 1883 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) 1884 port_num = wc->port_num; 1885 else 1886 port_num = port_priv->port_num; 1887 1888 if (recv->mad.mad.mad_hdr.mgmt_class == 1889 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 1890 enum smi_forward_action retsmi; 1891 1892 if (smi_handle_dr_smp_recv(&recv->mad.smp, 1893 port_priv->device->node_type, 1894 port_num, 1895 port_priv->device->phys_port_cnt) == 1896 IB_SMI_DISCARD) 1897 goto out; 1898 1899 retsmi = smi_check_forward_dr_smp(&recv->mad.smp); 1900 if (retsmi == IB_SMI_LOCAL) 1901 goto local; 1902 1903 if (retsmi == IB_SMI_SEND) { /* don't forward */ 1904 if (smi_handle_dr_smp_send(&recv->mad.smp, 1905 port_priv->device->node_type, 1906 port_num) == IB_SMI_DISCARD) 1907 goto out; 1908 1909 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD) 1910 goto out; 1911 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) { 1912 /* forward case for switches */ 1913 memcpy(response, recv, sizeof(*response)); 1914 response->header.recv_wc.wc = &response->header.wc; 1915 response->header.recv_wc.recv_buf.mad = &response->mad.mad; 1916 response->header.recv_wc.recv_buf.grh = &response->grh; 1917 1918 agent_send_response(&response->mad.mad, 1919 &response->grh, wc, 1920 port_priv->device, 1921 smi_get_fwd_port(&recv->mad.smp), 1922 qp_info->qp->qp_num); 1923 1924 goto out; 1925 } 1926 } 1927 1928 local: 1929 /* Give driver "right of first refusal" on incoming MAD */ 1930 if (port_priv->device->process_mad) { 1931 int ret; 1932 1933 ret = port_priv->device->process_mad(port_priv->device, 0, 1934 port_priv->port_num, 1935 wc, &recv->grh, 1936 &recv->mad.mad, 1937 &response->mad.mad); 1938 if (ret & IB_MAD_RESULT_SUCCESS) { 1939 if (ret & IB_MAD_RESULT_CONSUMED) 1940 goto out; 1941 if (ret & IB_MAD_RESULT_REPLY) { 1942 agent_send_response(&response->mad.mad, 1943 &recv->grh, wc, 1944 port_priv->device, 1945 port_num, 1946 qp_info->qp->qp_num); 1947 goto out; 1948 } 1949 } 1950 } 1951 1952 mad_agent = find_mad_agent(port_priv, &recv->mad.mad); 1953 if (mad_agent) { 1954 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc); 1955 /* 1956 * recv is freed up in error cases in ib_mad_complete_recv 1957 * or via recv_handler in ib_mad_complete_recv() 1958 */ 1959 recv = NULL; 1960 } 1961 1962 out: 1963 /* Post another receive request for this QP */ 1964 if (response) { 1965 ib_mad_post_receive_mads(qp_info, response); 1966 if (recv) 1967 kmem_cache_free(ib_mad_cache, recv); 1968 } else 1969 ib_mad_post_receive_mads(qp_info, recv); 1970 } 1971 1972 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv) 1973 { 1974 struct ib_mad_send_wr_private *mad_send_wr; 1975 unsigned long delay; 1976 1977 if (list_empty(&mad_agent_priv->wait_list)) { 1978 cancel_delayed_work(&mad_agent_priv->timed_work); 1979 } else { 1980 mad_send_wr = list_entry(mad_agent_priv->wait_list.next, 1981 struct ib_mad_send_wr_private, 1982 agent_list); 1983 1984 if (time_after(mad_agent_priv->timeout, 1985 mad_send_wr->timeout)) { 1986 mad_agent_priv->timeout = mad_send_wr->timeout; 1987 cancel_delayed_work(&mad_agent_priv->timed_work); 1988 delay = mad_send_wr->timeout - jiffies; 1989 if ((long)delay <= 0) 1990 delay = 1; 1991 queue_delayed_work(mad_agent_priv->qp_info-> 1992 port_priv->wq, 1993 &mad_agent_priv->timed_work, delay); 1994 } 1995 } 1996 } 1997 1998 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr) 1999 { 2000 struct ib_mad_agent_private *mad_agent_priv; 2001 struct ib_mad_send_wr_private *temp_mad_send_wr; 2002 struct list_head *list_item; 2003 unsigned long delay; 2004 2005 mad_agent_priv = mad_send_wr->mad_agent_priv; 2006 list_del(&mad_send_wr->agent_list); 2007 2008 delay = mad_send_wr->timeout; 2009 mad_send_wr->timeout += jiffies; 2010 2011 if (delay) { 2012 list_for_each_prev(list_item, &mad_agent_priv->wait_list) { 2013 temp_mad_send_wr = list_entry(list_item, 2014 struct ib_mad_send_wr_private, 2015 agent_list); 2016 if (time_after(mad_send_wr->timeout, 2017 temp_mad_send_wr->timeout)) 2018 break; 2019 } 2020 } 2021 else 2022 list_item = &mad_agent_priv->wait_list; 2023 list_add(&mad_send_wr->agent_list, list_item); 2024 2025 /* Reschedule a work item if we have a shorter timeout */ 2026 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) { 2027 cancel_delayed_work(&mad_agent_priv->timed_work); 2028 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq, 2029 &mad_agent_priv->timed_work, delay); 2030 } 2031 } 2032 2033 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr, 2034 int timeout_ms) 2035 { 2036 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2037 wait_for_response(mad_send_wr); 2038 } 2039 2040 /* 2041 * Process a send work completion 2042 */ 2043 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr, 2044 struct ib_mad_send_wc *mad_send_wc) 2045 { 2046 struct ib_mad_agent_private *mad_agent_priv; 2047 unsigned long flags; 2048 int ret; 2049 2050 mad_agent_priv = mad_send_wr->mad_agent_priv; 2051 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2052 if (mad_agent_priv->agent.rmpp_version) { 2053 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc); 2054 if (ret == IB_RMPP_RESULT_CONSUMED) 2055 goto done; 2056 } else 2057 ret = IB_RMPP_RESULT_UNHANDLED; 2058 2059 if (mad_send_wc->status != IB_WC_SUCCESS && 2060 mad_send_wr->status == IB_WC_SUCCESS) { 2061 mad_send_wr->status = mad_send_wc->status; 2062 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2063 } 2064 2065 if (--mad_send_wr->refcount > 0) { 2066 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout && 2067 mad_send_wr->status == IB_WC_SUCCESS) { 2068 wait_for_response(mad_send_wr); 2069 } 2070 goto done; 2071 } 2072 2073 /* Remove send from MAD agent and notify client of completion */ 2074 list_del(&mad_send_wr->agent_list); 2075 adjust_timeout(mad_agent_priv); 2076 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2077 2078 if (mad_send_wr->status != IB_WC_SUCCESS ) 2079 mad_send_wc->status = mad_send_wr->status; 2080 if (ret == IB_RMPP_RESULT_INTERNAL) 2081 ib_rmpp_send_handler(mad_send_wc); 2082 else 2083 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2084 mad_send_wc); 2085 2086 /* Release reference on agent taken when sending */ 2087 deref_mad_agent(mad_agent_priv); 2088 return; 2089 done: 2090 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2091 } 2092 2093 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv, 2094 struct ib_wc *wc) 2095 { 2096 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr; 2097 struct ib_mad_list_head *mad_list; 2098 struct ib_mad_qp_info *qp_info; 2099 struct ib_mad_queue *send_queue; 2100 struct ib_send_wr *bad_send_wr; 2101 struct ib_mad_send_wc mad_send_wc; 2102 unsigned long flags; 2103 int ret; 2104 2105 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 2106 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2107 mad_list); 2108 send_queue = mad_list->mad_queue; 2109 qp_info = send_queue->qp_info; 2110 2111 retry: 2112 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2113 mad_send_wr->header_mapping, 2114 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE); 2115 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2116 mad_send_wr->payload_mapping, 2117 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE); 2118 queued_send_wr = NULL; 2119 spin_lock_irqsave(&send_queue->lock, flags); 2120 list_del(&mad_list->list); 2121 2122 /* Move queued send to the send queue */ 2123 if (send_queue->count-- > send_queue->max_active) { 2124 mad_list = container_of(qp_info->overflow_list.next, 2125 struct ib_mad_list_head, list); 2126 queued_send_wr = container_of(mad_list, 2127 struct ib_mad_send_wr_private, 2128 mad_list); 2129 list_move_tail(&mad_list->list, &send_queue->list); 2130 } 2131 spin_unlock_irqrestore(&send_queue->lock, flags); 2132 2133 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2134 mad_send_wc.status = wc->status; 2135 mad_send_wc.vendor_err = wc->vendor_err; 2136 if (atomic_read(&qp_info->snoop_count)) 2137 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc, 2138 IB_MAD_SNOOP_SEND_COMPLETIONS); 2139 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 2140 2141 if (queued_send_wr) { 2142 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr, 2143 &bad_send_wr); 2144 if (ret) { 2145 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret); 2146 mad_send_wr = queued_send_wr; 2147 wc->status = IB_WC_LOC_QP_OP_ERR; 2148 goto retry; 2149 } 2150 } 2151 } 2152 2153 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info) 2154 { 2155 struct ib_mad_send_wr_private *mad_send_wr; 2156 struct ib_mad_list_head *mad_list; 2157 unsigned long flags; 2158 2159 spin_lock_irqsave(&qp_info->send_queue.lock, flags); 2160 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) { 2161 mad_send_wr = container_of(mad_list, 2162 struct ib_mad_send_wr_private, 2163 mad_list); 2164 mad_send_wr->retry = 1; 2165 } 2166 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); 2167 } 2168 2169 static void mad_error_handler(struct ib_mad_port_private *port_priv, 2170 struct ib_wc *wc) 2171 { 2172 struct ib_mad_list_head *mad_list; 2173 struct ib_mad_qp_info *qp_info; 2174 struct ib_mad_send_wr_private *mad_send_wr; 2175 int ret; 2176 2177 /* Determine if failure was a send or receive */ 2178 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 2179 qp_info = mad_list->mad_queue->qp_info; 2180 if (mad_list->mad_queue == &qp_info->recv_queue) 2181 /* 2182 * Receive errors indicate that the QP has entered the error 2183 * state - error handling/shutdown code will cleanup 2184 */ 2185 return; 2186 2187 /* 2188 * Send errors will transition the QP to SQE - move 2189 * QP to RTS and repost flushed work requests 2190 */ 2191 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2192 mad_list); 2193 if (wc->status == IB_WC_WR_FLUSH_ERR) { 2194 if (mad_send_wr->retry) { 2195 /* Repost send */ 2196 struct ib_send_wr *bad_send_wr; 2197 2198 mad_send_wr->retry = 0; 2199 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr, 2200 &bad_send_wr); 2201 if (ret) 2202 ib_mad_send_done_handler(port_priv, wc); 2203 } else 2204 ib_mad_send_done_handler(port_priv, wc); 2205 } else { 2206 struct ib_qp_attr *attr; 2207 2208 /* Transition QP to RTS and fail offending send */ 2209 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2210 if (attr) { 2211 attr->qp_state = IB_QPS_RTS; 2212 attr->cur_qp_state = IB_QPS_SQE; 2213 ret = ib_modify_qp(qp_info->qp, attr, 2214 IB_QP_STATE | IB_QP_CUR_STATE); 2215 kfree(attr); 2216 if (ret) 2217 printk(KERN_ERR PFX "mad_error_handler - " 2218 "ib_modify_qp to RTS : %d\n", ret); 2219 else 2220 mark_sends_for_retry(qp_info); 2221 } 2222 ib_mad_send_done_handler(port_priv, wc); 2223 } 2224 } 2225 2226 /* 2227 * IB MAD completion callback 2228 */ 2229 static void ib_mad_completion_handler(struct work_struct *work) 2230 { 2231 struct ib_mad_port_private *port_priv; 2232 struct ib_wc wc; 2233 2234 port_priv = container_of(work, struct ib_mad_port_private, work); 2235 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); 2236 2237 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) { 2238 if (wc.status == IB_WC_SUCCESS) { 2239 switch (wc.opcode) { 2240 case IB_WC_SEND: 2241 ib_mad_send_done_handler(port_priv, &wc); 2242 break; 2243 case IB_WC_RECV: 2244 ib_mad_recv_done_handler(port_priv, &wc); 2245 break; 2246 default: 2247 BUG_ON(1); 2248 break; 2249 } 2250 } else 2251 mad_error_handler(port_priv, &wc); 2252 } 2253 } 2254 2255 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv) 2256 { 2257 unsigned long flags; 2258 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr; 2259 struct ib_mad_send_wc mad_send_wc; 2260 struct list_head cancel_list; 2261 2262 INIT_LIST_HEAD(&cancel_list); 2263 2264 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2265 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2266 &mad_agent_priv->send_list, agent_list) { 2267 if (mad_send_wr->status == IB_WC_SUCCESS) { 2268 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2269 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2270 } 2271 } 2272 2273 /* Empty wait list to prevent receives from finding a request */ 2274 list_splice_init(&mad_agent_priv->wait_list, &cancel_list); 2275 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2276 2277 /* Report all cancelled requests */ 2278 mad_send_wc.status = IB_WC_WR_FLUSH_ERR; 2279 mad_send_wc.vendor_err = 0; 2280 2281 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2282 &cancel_list, agent_list) { 2283 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2284 list_del(&mad_send_wr->agent_list); 2285 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2286 &mad_send_wc); 2287 atomic_dec(&mad_agent_priv->refcount); 2288 } 2289 } 2290 2291 static struct ib_mad_send_wr_private* 2292 find_send_wr(struct ib_mad_agent_private *mad_agent_priv, 2293 struct ib_mad_send_buf *send_buf) 2294 { 2295 struct ib_mad_send_wr_private *mad_send_wr; 2296 2297 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list, 2298 agent_list) { 2299 if (&mad_send_wr->send_buf == send_buf) 2300 return mad_send_wr; 2301 } 2302 2303 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list, 2304 agent_list) { 2305 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) && 2306 &mad_send_wr->send_buf == send_buf) 2307 return mad_send_wr; 2308 } 2309 return NULL; 2310 } 2311 2312 int ib_modify_mad(struct ib_mad_agent *mad_agent, 2313 struct ib_mad_send_buf *send_buf, u32 timeout_ms) 2314 { 2315 struct ib_mad_agent_private *mad_agent_priv; 2316 struct ib_mad_send_wr_private *mad_send_wr; 2317 unsigned long flags; 2318 int active; 2319 2320 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, 2321 agent); 2322 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2323 mad_send_wr = find_send_wr(mad_agent_priv, send_buf); 2324 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) { 2325 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2326 return -EINVAL; 2327 } 2328 2329 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1); 2330 if (!timeout_ms) { 2331 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2332 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2333 } 2334 2335 mad_send_wr->send_buf.timeout_ms = timeout_ms; 2336 if (active) 2337 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2338 else 2339 ib_reset_mad_timeout(mad_send_wr, timeout_ms); 2340 2341 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2342 return 0; 2343 } 2344 EXPORT_SYMBOL(ib_modify_mad); 2345 2346 void ib_cancel_mad(struct ib_mad_agent *mad_agent, 2347 struct ib_mad_send_buf *send_buf) 2348 { 2349 ib_modify_mad(mad_agent, send_buf, 0); 2350 } 2351 EXPORT_SYMBOL(ib_cancel_mad); 2352 2353 static void local_completions(struct work_struct *work) 2354 { 2355 struct ib_mad_agent_private *mad_agent_priv; 2356 struct ib_mad_local_private *local; 2357 struct ib_mad_agent_private *recv_mad_agent; 2358 unsigned long flags; 2359 int recv = 0; 2360 struct ib_wc wc; 2361 struct ib_mad_send_wc mad_send_wc; 2362 2363 mad_agent_priv = 2364 container_of(work, struct ib_mad_agent_private, local_work); 2365 2366 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2367 while (!list_empty(&mad_agent_priv->local_list)) { 2368 local = list_entry(mad_agent_priv->local_list.next, 2369 struct ib_mad_local_private, 2370 completion_list); 2371 list_del(&local->completion_list); 2372 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 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 goto local_send_completion; 2378 } 2379 2380 recv = 1; 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 (!recv) 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