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 = kmalloc(sizeof mad_snoop_priv * 410 qp_info->snoop_table_size + 1, 411 GFP_ATOMIC); 412 if (!new_snoop_table) { 413 i = -ENOMEM; 414 goto out; 415 } 416 if (qp_info->snoop_table) { 417 memcpy(new_snoop_table, qp_info->snoop_table, 418 sizeof mad_snoop_priv * 419 qp_info->snoop_table_size); 420 kfree(qp_info->snoop_table); 421 } 422 qp_info->snoop_table = new_snoop_table; 423 qp_info->snoop_table_size++; 424 } 425 qp_info->snoop_table[i] = mad_snoop_priv; 426 atomic_inc(&qp_info->snoop_count); 427 out: 428 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 429 return i; 430 } 431 432 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device, 433 u8 port_num, 434 enum ib_qp_type qp_type, 435 int mad_snoop_flags, 436 ib_mad_snoop_handler snoop_handler, 437 ib_mad_recv_handler recv_handler, 438 void *context) 439 { 440 struct ib_mad_port_private *port_priv; 441 struct ib_mad_agent *ret; 442 struct ib_mad_snoop_private *mad_snoop_priv; 443 int qpn; 444 445 /* Validate parameters */ 446 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) || 447 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) { 448 ret = ERR_PTR(-EINVAL); 449 goto error1; 450 } 451 qpn = get_spl_qp_index(qp_type); 452 if (qpn == -1) { 453 ret = ERR_PTR(-EINVAL); 454 goto error1; 455 } 456 port_priv = ib_get_mad_port(device, port_num); 457 if (!port_priv) { 458 ret = ERR_PTR(-ENODEV); 459 goto error1; 460 } 461 /* Allocate structures */ 462 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL); 463 if (!mad_snoop_priv) { 464 ret = ERR_PTR(-ENOMEM); 465 goto error1; 466 } 467 468 /* Now, fill in the various structures */ 469 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn]; 470 mad_snoop_priv->agent.device = device; 471 mad_snoop_priv->agent.recv_handler = recv_handler; 472 mad_snoop_priv->agent.snoop_handler = snoop_handler; 473 mad_snoop_priv->agent.context = context; 474 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp; 475 mad_snoop_priv->agent.port_num = port_num; 476 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags; 477 init_completion(&mad_snoop_priv->comp); 478 mad_snoop_priv->snoop_index = register_snoop_agent( 479 &port_priv->qp_info[qpn], 480 mad_snoop_priv); 481 if (mad_snoop_priv->snoop_index < 0) { 482 ret = ERR_PTR(mad_snoop_priv->snoop_index); 483 goto error2; 484 } 485 486 atomic_set(&mad_snoop_priv->refcount, 1); 487 return &mad_snoop_priv->agent; 488 489 error2: 490 kfree(mad_snoop_priv); 491 error1: 492 return ret; 493 } 494 EXPORT_SYMBOL(ib_register_mad_snoop); 495 496 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv) 497 { 498 if (atomic_dec_and_test(&mad_agent_priv->refcount)) 499 complete(&mad_agent_priv->comp); 500 } 501 502 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv) 503 { 504 if (atomic_dec_and_test(&mad_snoop_priv->refcount)) 505 complete(&mad_snoop_priv->comp); 506 } 507 508 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv) 509 { 510 struct ib_mad_port_private *port_priv; 511 unsigned long flags; 512 513 /* Note that we could still be handling received MADs */ 514 515 /* 516 * Canceling all sends results in dropping received response 517 * MADs, preventing us from queuing additional work 518 */ 519 cancel_mads(mad_agent_priv); 520 port_priv = mad_agent_priv->qp_info->port_priv; 521 cancel_delayed_work(&mad_agent_priv->timed_work); 522 523 spin_lock_irqsave(&port_priv->reg_lock, flags); 524 remove_mad_reg_req(mad_agent_priv); 525 list_del(&mad_agent_priv->agent_list); 526 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 527 528 flush_workqueue(port_priv->wq); 529 ib_cancel_rmpp_recvs(mad_agent_priv); 530 531 deref_mad_agent(mad_agent_priv); 532 wait_for_completion(&mad_agent_priv->comp); 533 534 kfree(mad_agent_priv->reg_req); 535 ib_dereg_mr(mad_agent_priv->agent.mr); 536 kfree(mad_agent_priv); 537 } 538 539 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv) 540 { 541 struct ib_mad_qp_info *qp_info; 542 unsigned long flags; 543 544 qp_info = mad_snoop_priv->qp_info; 545 spin_lock_irqsave(&qp_info->snoop_lock, flags); 546 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL; 547 atomic_dec(&qp_info->snoop_count); 548 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 549 550 deref_snoop_agent(mad_snoop_priv); 551 wait_for_completion(&mad_snoop_priv->comp); 552 553 kfree(mad_snoop_priv); 554 } 555 556 /* 557 * ib_unregister_mad_agent - Unregisters a client from using MAD services 558 */ 559 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent) 560 { 561 struct ib_mad_agent_private *mad_agent_priv; 562 struct ib_mad_snoop_private *mad_snoop_priv; 563 564 /* If the TID is zero, the agent can only snoop. */ 565 if (mad_agent->hi_tid) { 566 mad_agent_priv = container_of(mad_agent, 567 struct ib_mad_agent_private, 568 agent); 569 unregister_mad_agent(mad_agent_priv); 570 } else { 571 mad_snoop_priv = container_of(mad_agent, 572 struct ib_mad_snoop_private, 573 agent); 574 unregister_mad_snoop(mad_snoop_priv); 575 } 576 return 0; 577 } 578 EXPORT_SYMBOL(ib_unregister_mad_agent); 579 580 static void dequeue_mad(struct ib_mad_list_head *mad_list) 581 { 582 struct ib_mad_queue *mad_queue; 583 unsigned long flags; 584 585 BUG_ON(!mad_list->mad_queue); 586 mad_queue = mad_list->mad_queue; 587 spin_lock_irqsave(&mad_queue->lock, flags); 588 list_del(&mad_list->list); 589 mad_queue->count--; 590 spin_unlock_irqrestore(&mad_queue->lock, flags); 591 } 592 593 static void snoop_send(struct ib_mad_qp_info *qp_info, 594 struct ib_mad_send_buf *send_buf, 595 struct ib_mad_send_wc *mad_send_wc, 596 int mad_snoop_flags) 597 { 598 struct ib_mad_snoop_private *mad_snoop_priv; 599 unsigned long flags; 600 int i; 601 602 spin_lock_irqsave(&qp_info->snoop_lock, flags); 603 for (i = 0; i < qp_info->snoop_table_size; i++) { 604 mad_snoop_priv = qp_info->snoop_table[i]; 605 if (!mad_snoop_priv || 606 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags)) 607 continue; 608 609 atomic_inc(&mad_snoop_priv->refcount); 610 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 611 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent, 612 send_buf, mad_send_wc); 613 deref_snoop_agent(mad_snoop_priv); 614 spin_lock_irqsave(&qp_info->snoop_lock, flags); 615 } 616 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 617 } 618 619 static void snoop_recv(struct ib_mad_qp_info *qp_info, 620 struct ib_mad_recv_wc *mad_recv_wc, 621 int mad_snoop_flags) 622 { 623 struct ib_mad_snoop_private *mad_snoop_priv; 624 unsigned long flags; 625 int i; 626 627 spin_lock_irqsave(&qp_info->snoop_lock, flags); 628 for (i = 0; i < qp_info->snoop_table_size; i++) { 629 mad_snoop_priv = qp_info->snoop_table[i]; 630 if (!mad_snoop_priv || 631 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags)) 632 continue; 633 634 atomic_inc(&mad_snoop_priv->refcount); 635 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 636 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent, 637 mad_recv_wc); 638 deref_snoop_agent(mad_snoop_priv); 639 spin_lock_irqsave(&qp_info->snoop_lock, flags); 640 } 641 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 642 } 643 644 static void build_smp_wc(struct ib_qp *qp, 645 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num, 646 struct ib_wc *wc) 647 { 648 memset(wc, 0, sizeof *wc); 649 wc->wr_id = wr_id; 650 wc->status = IB_WC_SUCCESS; 651 wc->opcode = IB_WC_RECV; 652 wc->pkey_index = pkey_index; 653 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh); 654 wc->src_qp = IB_QP0; 655 wc->qp = qp; 656 wc->slid = slid; 657 wc->sl = 0; 658 wc->dlid_path_bits = 0; 659 wc->port_num = port_num; 660 } 661 662 /* 663 * Return 0 if SMP is to be sent 664 * Return 1 if SMP was consumed locally (whether or not solicited) 665 * Return < 0 if error 666 */ 667 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv, 668 struct ib_mad_send_wr_private *mad_send_wr) 669 { 670 int ret = 0; 671 struct ib_smp *smp = mad_send_wr->send_buf.mad; 672 unsigned long flags; 673 struct ib_mad_local_private *local; 674 struct ib_mad_private *mad_priv; 675 struct ib_mad_port_private *port_priv; 676 struct ib_mad_agent_private *recv_mad_agent = NULL; 677 struct ib_device *device = mad_agent_priv->agent.device; 678 u8 port_num; 679 struct ib_wc mad_wc; 680 struct ib_send_wr *send_wr = &mad_send_wr->send_wr; 681 682 if (device->node_type == RDMA_NODE_IB_SWITCH && 683 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 684 port_num = send_wr->wr.ud.port_num; 685 else 686 port_num = mad_agent_priv->agent.port_num; 687 688 /* 689 * Directed route handling starts if the initial LID routed part of 690 * a request or the ending LID routed part of a response is empty. 691 * If we are at the start of the LID routed part, don't update the 692 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec. 693 */ 694 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) == 695 IB_LID_PERMISSIVE && 696 smi_handle_dr_smp_send(smp, device->node_type, port_num) == 697 IB_SMI_DISCARD) { 698 ret = -EINVAL; 699 printk(KERN_ERR PFX "Invalid directed route\n"); 700 goto out; 701 } 702 703 /* Check to post send on QP or process locally */ 704 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD && 705 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD) 706 goto out; 707 708 local = kmalloc(sizeof *local, GFP_ATOMIC); 709 if (!local) { 710 ret = -ENOMEM; 711 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n"); 712 goto out; 713 } 714 local->mad_priv = NULL; 715 local->recv_mad_agent = NULL; 716 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC); 717 if (!mad_priv) { 718 ret = -ENOMEM; 719 printk(KERN_ERR PFX "No memory for local response MAD\n"); 720 kfree(local); 721 goto out; 722 } 723 724 build_smp_wc(mad_agent_priv->agent.qp, 725 send_wr->wr_id, be16_to_cpu(smp->dr_slid), 726 send_wr->wr.ud.pkey_index, 727 send_wr->wr.ud.port_num, &mad_wc); 728 729 /* No GRH for DR SMP */ 730 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL, 731 (struct ib_mad *)smp, 732 (struct ib_mad *)&mad_priv->mad); 733 switch (ret) 734 { 735 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY: 736 if (ib_response_mad(&mad_priv->mad.mad) && 737 mad_agent_priv->agent.recv_handler) { 738 local->mad_priv = mad_priv; 739 local->recv_mad_agent = mad_agent_priv; 740 /* 741 * Reference MAD agent until receive 742 * side of local completion handled 743 */ 744 atomic_inc(&mad_agent_priv->refcount); 745 } else 746 kmem_cache_free(ib_mad_cache, mad_priv); 747 break; 748 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED: 749 kmem_cache_free(ib_mad_cache, mad_priv); 750 kfree(local); 751 ret = 1; 752 goto out; 753 case IB_MAD_RESULT_SUCCESS: 754 /* Treat like an incoming receive MAD */ 755 port_priv = ib_get_mad_port(mad_agent_priv->agent.device, 756 mad_agent_priv->agent.port_num); 757 if (port_priv) { 758 memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad)); 759 recv_mad_agent = find_mad_agent(port_priv, 760 &mad_priv->mad.mad); 761 } 762 if (!port_priv || !recv_mad_agent) { 763 kmem_cache_free(ib_mad_cache, mad_priv); 764 kfree(local); 765 ret = 0; 766 goto out; 767 } 768 local->mad_priv = mad_priv; 769 local->recv_mad_agent = recv_mad_agent; 770 break; 771 default: 772 kmem_cache_free(ib_mad_cache, mad_priv); 773 kfree(local); 774 ret = -EINVAL; 775 goto out; 776 } 777 778 local->mad_send_wr = mad_send_wr; 779 /* Reference MAD agent until send side of local completion handled */ 780 atomic_inc(&mad_agent_priv->refcount); 781 /* Queue local completion to local list */ 782 spin_lock_irqsave(&mad_agent_priv->lock, flags); 783 list_add_tail(&local->completion_list, &mad_agent_priv->local_list); 784 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 785 queue_work(mad_agent_priv->qp_info->port_priv->wq, 786 &mad_agent_priv->local_work); 787 ret = 1; 788 out: 789 return ret; 790 } 791 792 static int get_pad_size(int hdr_len, int data_len) 793 { 794 int seg_size, pad; 795 796 seg_size = sizeof(struct ib_mad) - hdr_len; 797 if (data_len && seg_size) { 798 pad = seg_size - data_len % seg_size; 799 return pad == seg_size ? 0 : pad; 800 } else 801 return seg_size; 802 } 803 804 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr) 805 { 806 struct ib_rmpp_segment *s, *t; 807 808 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) { 809 list_del(&s->list); 810 kfree(s); 811 } 812 } 813 814 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr, 815 gfp_t gfp_mask) 816 { 817 struct ib_mad_send_buf *send_buf = &send_wr->send_buf; 818 struct ib_rmpp_mad *rmpp_mad = send_buf->mad; 819 struct ib_rmpp_segment *seg = NULL; 820 int left, seg_size, pad; 821 822 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len; 823 seg_size = send_buf->seg_size; 824 pad = send_wr->pad; 825 826 /* Allocate data segments. */ 827 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) { 828 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask); 829 if (!seg) { 830 printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem " 831 "alloc failed for len %zd, gfp %#x\n", 832 sizeof (*seg) + seg_size, gfp_mask); 833 free_send_rmpp_list(send_wr); 834 return -ENOMEM; 835 } 836 seg->num = ++send_buf->seg_count; 837 list_add_tail(&seg->list, &send_wr->rmpp_list); 838 } 839 840 /* Zero any padding */ 841 if (pad) 842 memset(seg->data + seg_size - pad, 0, pad); 843 844 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv-> 845 agent.rmpp_version; 846 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA; 847 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 848 849 send_wr->cur_seg = container_of(send_wr->rmpp_list.next, 850 struct ib_rmpp_segment, list); 851 send_wr->last_ack_seg = send_wr->cur_seg; 852 return 0; 853 } 854 855 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent, 856 u32 remote_qpn, u16 pkey_index, 857 int rmpp_active, 858 int hdr_len, int data_len, 859 gfp_t gfp_mask) 860 { 861 struct ib_mad_agent_private *mad_agent_priv; 862 struct ib_mad_send_wr_private *mad_send_wr; 863 int pad, message_size, ret, size; 864 void *buf; 865 866 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, 867 agent); 868 pad = get_pad_size(hdr_len, data_len); 869 message_size = hdr_len + data_len + pad; 870 871 if ((!mad_agent->rmpp_version && 872 (rmpp_active || message_size > sizeof(struct ib_mad))) || 873 (!rmpp_active && message_size > sizeof(struct ib_mad))) 874 return ERR_PTR(-EINVAL); 875 876 size = rmpp_active ? hdr_len : sizeof(struct ib_mad); 877 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask); 878 if (!buf) 879 return ERR_PTR(-ENOMEM); 880 881 mad_send_wr = buf + size; 882 INIT_LIST_HEAD(&mad_send_wr->rmpp_list); 883 mad_send_wr->send_buf.mad = buf; 884 mad_send_wr->send_buf.hdr_len = hdr_len; 885 mad_send_wr->send_buf.data_len = data_len; 886 mad_send_wr->pad = pad; 887 888 mad_send_wr->mad_agent_priv = mad_agent_priv; 889 mad_send_wr->sg_list[0].length = hdr_len; 890 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey; 891 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len; 892 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey; 893 894 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr; 895 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list; 896 mad_send_wr->send_wr.num_sge = 2; 897 mad_send_wr->send_wr.opcode = IB_WR_SEND; 898 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED; 899 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn; 900 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY; 901 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index; 902 903 if (rmpp_active) { 904 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask); 905 if (ret) { 906 kfree(buf); 907 return ERR_PTR(ret); 908 } 909 } 910 911 mad_send_wr->send_buf.mad_agent = mad_agent; 912 atomic_inc(&mad_agent_priv->refcount); 913 return &mad_send_wr->send_buf; 914 } 915 EXPORT_SYMBOL(ib_create_send_mad); 916 917 int ib_get_mad_data_offset(u8 mgmt_class) 918 { 919 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM) 920 return IB_MGMT_SA_HDR; 921 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) || 922 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) || 923 (mgmt_class == IB_MGMT_CLASS_BIS)) 924 return IB_MGMT_DEVICE_HDR; 925 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && 926 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)) 927 return IB_MGMT_VENDOR_HDR; 928 else 929 return IB_MGMT_MAD_HDR; 930 } 931 EXPORT_SYMBOL(ib_get_mad_data_offset); 932 933 int ib_is_mad_class_rmpp(u8 mgmt_class) 934 { 935 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) || 936 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) || 937 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) || 938 (mgmt_class == IB_MGMT_CLASS_BIS) || 939 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && 940 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))) 941 return 1; 942 return 0; 943 } 944 EXPORT_SYMBOL(ib_is_mad_class_rmpp); 945 946 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num) 947 { 948 struct ib_mad_send_wr_private *mad_send_wr; 949 struct list_head *list; 950 951 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private, 952 send_buf); 953 list = &mad_send_wr->cur_seg->list; 954 955 if (mad_send_wr->cur_seg->num < seg_num) { 956 list_for_each_entry(mad_send_wr->cur_seg, list, list) 957 if (mad_send_wr->cur_seg->num == seg_num) 958 break; 959 } else if (mad_send_wr->cur_seg->num > seg_num) { 960 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list) 961 if (mad_send_wr->cur_seg->num == seg_num) 962 break; 963 } 964 return mad_send_wr->cur_seg->data; 965 } 966 EXPORT_SYMBOL(ib_get_rmpp_segment); 967 968 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr) 969 { 970 if (mad_send_wr->send_buf.seg_count) 971 return ib_get_rmpp_segment(&mad_send_wr->send_buf, 972 mad_send_wr->seg_num); 973 else 974 return mad_send_wr->send_buf.mad + 975 mad_send_wr->send_buf.hdr_len; 976 } 977 978 void ib_free_send_mad(struct ib_mad_send_buf *send_buf) 979 { 980 struct ib_mad_agent_private *mad_agent_priv; 981 struct ib_mad_send_wr_private *mad_send_wr; 982 983 mad_agent_priv = container_of(send_buf->mad_agent, 984 struct ib_mad_agent_private, agent); 985 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private, 986 send_buf); 987 988 free_send_rmpp_list(mad_send_wr); 989 kfree(send_buf->mad); 990 deref_mad_agent(mad_agent_priv); 991 } 992 EXPORT_SYMBOL(ib_free_send_mad); 993 994 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr) 995 { 996 struct ib_mad_qp_info *qp_info; 997 struct list_head *list; 998 struct ib_send_wr *bad_send_wr; 999 struct ib_mad_agent *mad_agent; 1000 struct ib_sge *sge; 1001 unsigned long flags; 1002 int ret; 1003 1004 /* Set WR ID to find mad_send_wr upon completion */ 1005 qp_info = mad_send_wr->mad_agent_priv->qp_info; 1006 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list; 1007 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue; 1008 1009 mad_agent = mad_send_wr->send_buf.mad_agent; 1010 sge = mad_send_wr->sg_list; 1011 sge[0].addr = ib_dma_map_single(mad_agent->device, 1012 mad_send_wr->send_buf.mad, 1013 sge[0].length, 1014 DMA_TO_DEVICE); 1015 mad_send_wr->header_mapping = sge[0].addr; 1016 1017 sge[1].addr = ib_dma_map_single(mad_agent->device, 1018 ib_get_payload(mad_send_wr), 1019 sge[1].length, 1020 DMA_TO_DEVICE); 1021 mad_send_wr->payload_mapping = sge[1].addr; 1022 1023 spin_lock_irqsave(&qp_info->send_queue.lock, flags); 1024 if (qp_info->send_queue.count < qp_info->send_queue.max_active) { 1025 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr, 1026 &bad_send_wr); 1027 list = &qp_info->send_queue.list; 1028 } else { 1029 ret = 0; 1030 list = &qp_info->overflow_list; 1031 } 1032 1033 if (!ret) { 1034 qp_info->send_queue.count++; 1035 list_add_tail(&mad_send_wr->mad_list.list, list); 1036 } 1037 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); 1038 if (ret) { 1039 ib_dma_unmap_single(mad_agent->device, 1040 mad_send_wr->header_mapping, 1041 sge[0].length, DMA_TO_DEVICE); 1042 ib_dma_unmap_single(mad_agent->device, 1043 mad_send_wr->payload_mapping, 1044 sge[1].length, DMA_TO_DEVICE); 1045 } 1046 return ret; 1047 } 1048 1049 /* 1050 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated 1051 * with the registered client 1052 */ 1053 int ib_post_send_mad(struct ib_mad_send_buf *send_buf, 1054 struct ib_mad_send_buf **bad_send_buf) 1055 { 1056 struct ib_mad_agent_private *mad_agent_priv; 1057 struct ib_mad_send_buf *next_send_buf; 1058 struct ib_mad_send_wr_private *mad_send_wr; 1059 unsigned long flags; 1060 int ret = -EINVAL; 1061 1062 /* Walk list of send WRs and post each on send list */ 1063 for (; send_buf; send_buf = next_send_buf) { 1064 1065 mad_send_wr = container_of(send_buf, 1066 struct ib_mad_send_wr_private, 1067 send_buf); 1068 mad_agent_priv = mad_send_wr->mad_agent_priv; 1069 1070 if (!send_buf->mad_agent->send_handler || 1071 (send_buf->timeout_ms && 1072 !send_buf->mad_agent->recv_handler)) { 1073 ret = -EINVAL; 1074 goto error; 1075 } 1076 1077 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) { 1078 if (mad_agent_priv->agent.rmpp_version) { 1079 ret = -EINVAL; 1080 goto error; 1081 } 1082 } 1083 1084 /* 1085 * Save pointer to next work request to post in case the 1086 * current one completes, and the user modifies the work 1087 * request associated with the completion 1088 */ 1089 next_send_buf = send_buf->next; 1090 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah; 1091 1092 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class == 1093 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 1094 ret = handle_outgoing_dr_smp(mad_agent_priv, 1095 mad_send_wr); 1096 if (ret < 0) /* error */ 1097 goto error; 1098 else if (ret == 1) /* locally consumed */ 1099 continue; 1100 } 1101 1102 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid; 1103 /* Timeout will be updated after send completes */ 1104 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms); 1105 mad_send_wr->max_retries = send_buf->retries; 1106 mad_send_wr->retries_left = send_buf->retries; 1107 send_buf->retries = 0; 1108 /* Reference for work request to QP + response */ 1109 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0); 1110 mad_send_wr->status = IB_WC_SUCCESS; 1111 1112 /* Reference MAD agent until send completes */ 1113 atomic_inc(&mad_agent_priv->refcount); 1114 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1115 list_add_tail(&mad_send_wr->agent_list, 1116 &mad_agent_priv->send_list); 1117 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1118 1119 if (mad_agent_priv->agent.rmpp_version) { 1120 ret = ib_send_rmpp_mad(mad_send_wr); 1121 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED) 1122 ret = ib_send_mad(mad_send_wr); 1123 } else 1124 ret = ib_send_mad(mad_send_wr); 1125 if (ret < 0) { 1126 /* Fail send request */ 1127 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1128 list_del(&mad_send_wr->agent_list); 1129 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1130 atomic_dec(&mad_agent_priv->refcount); 1131 goto error; 1132 } 1133 } 1134 return 0; 1135 error: 1136 if (bad_send_buf) 1137 *bad_send_buf = send_buf; 1138 return ret; 1139 } 1140 EXPORT_SYMBOL(ib_post_send_mad); 1141 1142 /* 1143 * ib_free_recv_mad - Returns data buffers used to receive 1144 * a MAD to the access layer 1145 */ 1146 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc) 1147 { 1148 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf; 1149 struct ib_mad_private_header *mad_priv_hdr; 1150 struct ib_mad_private *priv; 1151 struct list_head free_list; 1152 1153 INIT_LIST_HEAD(&free_list); 1154 list_splice_init(&mad_recv_wc->rmpp_list, &free_list); 1155 1156 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf, 1157 &free_list, list) { 1158 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc, 1159 recv_buf); 1160 mad_priv_hdr = container_of(mad_recv_wc, 1161 struct ib_mad_private_header, 1162 recv_wc); 1163 priv = container_of(mad_priv_hdr, struct ib_mad_private, 1164 header); 1165 kmem_cache_free(ib_mad_cache, priv); 1166 } 1167 } 1168 EXPORT_SYMBOL(ib_free_recv_mad); 1169 1170 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp, 1171 u8 rmpp_version, 1172 ib_mad_send_handler send_handler, 1173 ib_mad_recv_handler recv_handler, 1174 void *context) 1175 { 1176 return ERR_PTR(-EINVAL); /* XXX: for now */ 1177 } 1178 EXPORT_SYMBOL(ib_redirect_mad_qp); 1179 1180 int ib_process_mad_wc(struct ib_mad_agent *mad_agent, 1181 struct ib_wc *wc) 1182 { 1183 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n"); 1184 return 0; 1185 } 1186 EXPORT_SYMBOL(ib_process_mad_wc); 1187 1188 static int method_in_use(struct ib_mad_mgmt_method_table **method, 1189 struct ib_mad_reg_req *mad_reg_req) 1190 { 1191 int i; 1192 1193 for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS); 1194 i < IB_MGMT_MAX_METHODS; 1195 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS, 1196 1+i)) { 1197 if ((*method)->agent[i]) { 1198 printk(KERN_ERR PFX "Method %d already in use\n", i); 1199 return -EINVAL; 1200 } 1201 } 1202 return 0; 1203 } 1204 1205 static int allocate_method_table(struct ib_mad_mgmt_method_table **method) 1206 { 1207 /* Allocate management method table */ 1208 *method = kzalloc(sizeof **method, GFP_ATOMIC); 1209 if (!*method) { 1210 printk(KERN_ERR PFX "No memory for " 1211 "ib_mad_mgmt_method_table\n"); 1212 return -ENOMEM; 1213 } 1214 1215 return 0; 1216 } 1217 1218 /* 1219 * Check to see if there are any methods still in use 1220 */ 1221 static int check_method_table(struct ib_mad_mgmt_method_table *method) 1222 { 1223 int i; 1224 1225 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) 1226 if (method->agent[i]) 1227 return 1; 1228 return 0; 1229 } 1230 1231 /* 1232 * Check to see if there are any method tables for this class still in use 1233 */ 1234 static int check_class_table(struct ib_mad_mgmt_class_table *class) 1235 { 1236 int i; 1237 1238 for (i = 0; i < MAX_MGMT_CLASS; i++) 1239 if (class->method_table[i]) 1240 return 1; 1241 return 0; 1242 } 1243 1244 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class) 1245 { 1246 int i; 1247 1248 for (i = 0; i < MAX_MGMT_OUI; i++) 1249 if (vendor_class->method_table[i]) 1250 return 1; 1251 return 0; 1252 } 1253 1254 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class, 1255 char *oui) 1256 { 1257 int i; 1258 1259 for (i = 0; i < MAX_MGMT_OUI; i++) 1260 /* Is there matching OUI for this vendor class ? */ 1261 if (!memcmp(vendor_class->oui[i], oui, 3)) 1262 return i; 1263 1264 return -1; 1265 } 1266 1267 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor) 1268 { 1269 int i; 1270 1271 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++) 1272 if (vendor->vendor_class[i]) 1273 return 1; 1274 1275 return 0; 1276 } 1277 1278 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method, 1279 struct ib_mad_agent_private *agent) 1280 { 1281 int i; 1282 1283 /* Remove any methods for this mad agent */ 1284 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) { 1285 if (method->agent[i] == agent) { 1286 method->agent[i] = NULL; 1287 } 1288 } 1289 } 1290 1291 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req, 1292 struct ib_mad_agent_private *agent_priv, 1293 u8 mgmt_class) 1294 { 1295 struct ib_mad_port_private *port_priv; 1296 struct ib_mad_mgmt_class_table **class; 1297 struct ib_mad_mgmt_method_table **method; 1298 int i, ret; 1299 1300 port_priv = agent_priv->qp_info->port_priv; 1301 class = &port_priv->version[mad_reg_req->mgmt_class_version].class; 1302 if (!*class) { 1303 /* Allocate management class table for "new" class version */ 1304 *class = kzalloc(sizeof **class, GFP_ATOMIC); 1305 if (!*class) { 1306 printk(KERN_ERR PFX "No memory for " 1307 "ib_mad_mgmt_class_table\n"); 1308 ret = -ENOMEM; 1309 goto error1; 1310 } 1311 1312 /* Allocate method table for this management class */ 1313 method = &(*class)->method_table[mgmt_class]; 1314 if ((ret = allocate_method_table(method))) 1315 goto error2; 1316 } else { 1317 method = &(*class)->method_table[mgmt_class]; 1318 if (!*method) { 1319 /* Allocate method table for this management class */ 1320 if ((ret = allocate_method_table(method))) 1321 goto error1; 1322 } 1323 } 1324 1325 /* Now, make sure methods are not already in use */ 1326 if (method_in_use(method, mad_reg_req)) 1327 goto error3; 1328 1329 /* Finally, add in methods being registered */ 1330 for (i = find_first_bit(mad_reg_req->method_mask, 1331 IB_MGMT_MAX_METHODS); 1332 i < IB_MGMT_MAX_METHODS; 1333 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS, 1334 1+i)) { 1335 (*method)->agent[i] = agent_priv; 1336 } 1337 return 0; 1338 1339 error3: 1340 /* Remove any methods for this mad agent */ 1341 remove_methods_mad_agent(*method, agent_priv); 1342 /* Now, check to see if there are any methods in use */ 1343 if (!check_method_table(*method)) { 1344 /* If not, release management method table */ 1345 kfree(*method); 1346 *method = NULL; 1347 } 1348 ret = -EINVAL; 1349 goto error1; 1350 error2: 1351 kfree(*class); 1352 *class = NULL; 1353 error1: 1354 return ret; 1355 } 1356 1357 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req, 1358 struct ib_mad_agent_private *agent_priv) 1359 { 1360 struct ib_mad_port_private *port_priv; 1361 struct ib_mad_mgmt_vendor_class_table **vendor_table; 1362 struct ib_mad_mgmt_vendor_class_table *vendor = NULL; 1363 struct ib_mad_mgmt_vendor_class *vendor_class = NULL; 1364 struct ib_mad_mgmt_method_table **method; 1365 int i, ret = -ENOMEM; 1366 u8 vclass; 1367 1368 /* "New" vendor (with OUI) class */ 1369 vclass = vendor_class_index(mad_reg_req->mgmt_class); 1370 port_priv = agent_priv->qp_info->port_priv; 1371 vendor_table = &port_priv->version[ 1372 mad_reg_req->mgmt_class_version].vendor; 1373 if (!*vendor_table) { 1374 /* Allocate mgmt vendor class table for "new" class version */ 1375 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC); 1376 if (!vendor) { 1377 printk(KERN_ERR PFX "No memory for " 1378 "ib_mad_mgmt_vendor_class_table\n"); 1379 goto error1; 1380 } 1381 1382 *vendor_table = vendor; 1383 } 1384 if (!(*vendor_table)->vendor_class[vclass]) { 1385 /* Allocate table for this management vendor class */ 1386 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC); 1387 if (!vendor_class) { 1388 printk(KERN_ERR PFX "No memory for " 1389 "ib_mad_mgmt_vendor_class\n"); 1390 goto error2; 1391 } 1392 1393 (*vendor_table)->vendor_class[vclass] = vendor_class; 1394 } 1395 for (i = 0; i < MAX_MGMT_OUI; i++) { 1396 /* Is there matching OUI for this vendor class ? */ 1397 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i], 1398 mad_reg_req->oui, 3)) { 1399 method = &(*vendor_table)->vendor_class[ 1400 vclass]->method_table[i]; 1401 BUG_ON(!*method); 1402 goto check_in_use; 1403 } 1404 } 1405 for (i = 0; i < MAX_MGMT_OUI; i++) { 1406 /* OUI slot available ? */ 1407 if (!is_vendor_oui((*vendor_table)->vendor_class[ 1408 vclass]->oui[i])) { 1409 method = &(*vendor_table)->vendor_class[ 1410 vclass]->method_table[i]; 1411 BUG_ON(*method); 1412 /* Allocate method table for this OUI */ 1413 if ((ret = allocate_method_table(method))) 1414 goto error3; 1415 memcpy((*vendor_table)->vendor_class[vclass]->oui[i], 1416 mad_reg_req->oui, 3); 1417 goto check_in_use; 1418 } 1419 } 1420 printk(KERN_ERR PFX "All OUI slots in use\n"); 1421 goto error3; 1422 1423 check_in_use: 1424 /* Now, make sure methods are not already in use */ 1425 if (method_in_use(method, mad_reg_req)) 1426 goto error4; 1427 1428 /* Finally, add in methods being registered */ 1429 for (i = find_first_bit(mad_reg_req->method_mask, 1430 IB_MGMT_MAX_METHODS); 1431 i < IB_MGMT_MAX_METHODS; 1432 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS, 1433 1+i)) { 1434 (*method)->agent[i] = agent_priv; 1435 } 1436 return 0; 1437 1438 error4: 1439 /* Remove any methods for this mad agent */ 1440 remove_methods_mad_agent(*method, agent_priv); 1441 /* Now, check to see if there are any methods in use */ 1442 if (!check_method_table(*method)) { 1443 /* If not, release management method table */ 1444 kfree(*method); 1445 *method = NULL; 1446 } 1447 ret = -EINVAL; 1448 error3: 1449 if (vendor_class) { 1450 (*vendor_table)->vendor_class[vclass] = NULL; 1451 kfree(vendor_class); 1452 } 1453 error2: 1454 if (vendor) { 1455 *vendor_table = NULL; 1456 kfree(vendor); 1457 } 1458 error1: 1459 return ret; 1460 } 1461 1462 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv) 1463 { 1464 struct ib_mad_port_private *port_priv; 1465 struct ib_mad_mgmt_class_table *class; 1466 struct ib_mad_mgmt_method_table *method; 1467 struct ib_mad_mgmt_vendor_class_table *vendor; 1468 struct ib_mad_mgmt_vendor_class *vendor_class; 1469 int index; 1470 u8 mgmt_class; 1471 1472 /* 1473 * Was MAD registration request supplied 1474 * with original registration ? 1475 */ 1476 if (!agent_priv->reg_req) { 1477 goto out; 1478 } 1479 1480 port_priv = agent_priv->qp_info->port_priv; 1481 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class); 1482 class = port_priv->version[ 1483 agent_priv->reg_req->mgmt_class_version].class; 1484 if (!class) 1485 goto vendor_check; 1486 1487 method = class->method_table[mgmt_class]; 1488 if (method) { 1489 /* Remove any methods for this mad agent */ 1490 remove_methods_mad_agent(method, agent_priv); 1491 /* Now, check to see if there are any methods still in use */ 1492 if (!check_method_table(method)) { 1493 /* If not, release management method table */ 1494 kfree(method); 1495 class->method_table[mgmt_class] = NULL; 1496 /* Any management classes left ? */ 1497 if (!check_class_table(class)) { 1498 /* If not, release management class table */ 1499 kfree(class); 1500 port_priv->version[ 1501 agent_priv->reg_req-> 1502 mgmt_class_version].class = NULL; 1503 } 1504 } 1505 } 1506 1507 vendor_check: 1508 if (!is_vendor_class(mgmt_class)) 1509 goto out; 1510 1511 /* normalize mgmt_class to vendor range 2 */ 1512 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class); 1513 vendor = port_priv->version[ 1514 agent_priv->reg_req->mgmt_class_version].vendor; 1515 1516 if (!vendor) 1517 goto out; 1518 1519 vendor_class = vendor->vendor_class[mgmt_class]; 1520 if (vendor_class) { 1521 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui); 1522 if (index < 0) 1523 goto out; 1524 method = vendor_class->method_table[index]; 1525 if (method) { 1526 /* Remove any methods for this mad agent */ 1527 remove_methods_mad_agent(method, agent_priv); 1528 /* 1529 * Now, check to see if there are 1530 * any methods still in use 1531 */ 1532 if (!check_method_table(method)) { 1533 /* If not, release management method table */ 1534 kfree(method); 1535 vendor_class->method_table[index] = NULL; 1536 memset(vendor_class->oui[index], 0, 3); 1537 /* Any OUIs left ? */ 1538 if (!check_vendor_class(vendor_class)) { 1539 /* If not, release vendor class table */ 1540 kfree(vendor_class); 1541 vendor->vendor_class[mgmt_class] = NULL; 1542 /* Any other vendor classes left ? */ 1543 if (!check_vendor_table(vendor)) { 1544 kfree(vendor); 1545 port_priv->version[ 1546 agent_priv->reg_req-> 1547 mgmt_class_version]. 1548 vendor = NULL; 1549 } 1550 } 1551 } 1552 } 1553 } 1554 1555 out: 1556 return; 1557 } 1558 1559 static struct ib_mad_agent_private * 1560 find_mad_agent(struct ib_mad_port_private *port_priv, 1561 struct ib_mad *mad) 1562 { 1563 struct ib_mad_agent_private *mad_agent = NULL; 1564 unsigned long flags; 1565 1566 spin_lock_irqsave(&port_priv->reg_lock, flags); 1567 if (ib_response_mad(mad)) { 1568 u32 hi_tid; 1569 struct ib_mad_agent_private *entry; 1570 1571 /* 1572 * Routing is based on high 32 bits of transaction ID 1573 * of MAD. 1574 */ 1575 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32; 1576 list_for_each_entry(entry, &port_priv->agent_list, agent_list) { 1577 if (entry->agent.hi_tid == hi_tid) { 1578 mad_agent = entry; 1579 break; 1580 } 1581 } 1582 } else { 1583 struct ib_mad_mgmt_class_table *class; 1584 struct ib_mad_mgmt_method_table *method; 1585 struct ib_mad_mgmt_vendor_class_table *vendor; 1586 struct ib_mad_mgmt_vendor_class *vendor_class; 1587 struct ib_vendor_mad *vendor_mad; 1588 int index; 1589 1590 /* 1591 * Routing is based on version, class, and method 1592 * For "newer" vendor MADs, also based on OUI 1593 */ 1594 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION) 1595 goto out; 1596 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) { 1597 class = port_priv->version[ 1598 mad->mad_hdr.class_version].class; 1599 if (!class) 1600 goto out; 1601 method = class->method_table[convert_mgmt_class( 1602 mad->mad_hdr.mgmt_class)]; 1603 if (method) 1604 mad_agent = method->agent[mad->mad_hdr.method & 1605 ~IB_MGMT_METHOD_RESP]; 1606 } else { 1607 vendor = port_priv->version[ 1608 mad->mad_hdr.class_version].vendor; 1609 if (!vendor) 1610 goto out; 1611 vendor_class = vendor->vendor_class[vendor_class_index( 1612 mad->mad_hdr.mgmt_class)]; 1613 if (!vendor_class) 1614 goto out; 1615 /* Find matching OUI */ 1616 vendor_mad = (struct ib_vendor_mad *)mad; 1617 index = find_vendor_oui(vendor_class, vendor_mad->oui); 1618 if (index == -1) 1619 goto out; 1620 method = vendor_class->method_table[index]; 1621 if (method) { 1622 mad_agent = method->agent[mad->mad_hdr.method & 1623 ~IB_MGMT_METHOD_RESP]; 1624 } 1625 } 1626 } 1627 1628 if (mad_agent) { 1629 if (mad_agent->agent.recv_handler) 1630 atomic_inc(&mad_agent->refcount); 1631 else { 1632 printk(KERN_NOTICE PFX "No receive handler for client " 1633 "%p on port %d\n", 1634 &mad_agent->agent, port_priv->port_num); 1635 mad_agent = NULL; 1636 } 1637 } 1638 out: 1639 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 1640 1641 return mad_agent; 1642 } 1643 1644 static int validate_mad(struct ib_mad *mad, u32 qp_num) 1645 { 1646 int valid = 0; 1647 1648 /* Make sure MAD base version is understood */ 1649 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) { 1650 printk(KERN_ERR PFX "MAD received with unsupported base " 1651 "version %d\n", mad->mad_hdr.base_version); 1652 goto out; 1653 } 1654 1655 /* Filter SMI packets sent to other than QP0 */ 1656 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) || 1657 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) { 1658 if (qp_num == 0) 1659 valid = 1; 1660 } else { 1661 /* Filter GSI packets sent to QP0 */ 1662 if (qp_num != 0) 1663 valid = 1; 1664 } 1665 1666 out: 1667 return valid; 1668 } 1669 1670 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv, 1671 struct ib_mad_hdr *mad_hdr) 1672 { 1673 struct ib_rmpp_mad *rmpp_mad; 1674 1675 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr; 1676 return !mad_agent_priv->agent.rmpp_version || 1677 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 1678 IB_MGMT_RMPP_FLAG_ACTIVE) || 1679 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA); 1680 } 1681 1682 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr, 1683 struct ib_mad_recv_wc *rwc) 1684 { 1685 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class == 1686 rwc->recv_buf.mad->mad_hdr.mgmt_class; 1687 } 1688 1689 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv, 1690 struct ib_mad_send_wr_private *wr, 1691 struct ib_mad_recv_wc *rwc ) 1692 { 1693 struct ib_ah_attr attr; 1694 u8 send_resp, rcv_resp; 1695 union ib_gid sgid; 1696 struct ib_device *device = mad_agent_priv->agent.device; 1697 u8 port_num = mad_agent_priv->agent.port_num; 1698 u8 lmc; 1699 1700 send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad); 1701 rcv_resp = ib_response_mad(rwc->recv_buf.mad); 1702 1703 if (send_resp == rcv_resp) 1704 /* both requests, or both responses. GIDs different */ 1705 return 0; 1706 1707 if (ib_query_ah(wr->send_buf.ah, &attr)) 1708 /* Assume not equal, to avoid false positives. */ 1709 return 0; 1710 1711 if (!!(attr.ah_flags & IB_AH_GRH) != 1712 !!(rwc->wc->wc_flags & IB_WC_GRH)) 1713 /* one has GID, other does not. Assume different */ 1714 return 0; 1715 1716 if (!send_resp && rcv_resp) { 1717 /* is request/response. */ 1718 if (!(attr.ah_flags & IB_AH_GRH)) { 1719 if (ib_get_cached_lmc(device, port_num, &lmc)) 1720 return 0; 1721 return (!lmc || !((attr.src_path_bits ^ 1722 rwc->wc->dlid_path_bits) & 1723 ((1 << lmc) - 1))); 1724 } else { 1725 if (ib_get_cached_gid(device, port_num, 1726 attr.grh.sgid_index, &sgid)) 1727 return 0; 1728 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw, 1729 16); 1730 } 1731 } 1732 1733 if (!(attr.ah_flags & IB_AH_GRH)) 1734 return attr.dlid == rwc->wc->slid; 1735 else 1736 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw, 1737 16); 1738 } 1739 1740 static inline int is_direct(u8 class) 1741 { 1742 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE); 1743 } 1744 1745 struct ib_mad_send_wr_private* 1746 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv, 1747 struct ib_mad_recv_wc *wc) 1748 { 1749 struct ib_mad_send_wr_private *wr; 1750 struct ib_mad *mad; 1751 1752 mad = (struct ib_mad *)wc->recv_buf.mad; 1753 1754 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) { 1755 if ((wr->tid == mad->mad_hdr.tid) && 1756 rcv_has_same_class(wr, wc) && 1757 /* 1758 * Don't check GID for direct routed MADs. 1759 * These might have permissive LIDs. 1760 */ 1761 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) || 1762 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1763 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1764 } 1765 1766 /* 1767 * It's possible to receive the response before we've 1768 * been notified that the send has completed 1769 */ 1770 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) { 1771 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) && 1772 wr->tid == mad->mad_hdr.tid && 1773 wr->timeout && 1774 rcv_has_same_class(wr, wc) && 1775 /* 1776 * Don't check GID for direct routed MADs. 1777 * These might have permissive LIDs. 1778 */ 1779 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) || 1780 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1781 /* Verify request has not been canceled */ 1782 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1783 } 1784 return NULL; 1785 } 1786 1787 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr) 1788 { 1789 mad_send_wr->timeout = 0; 1790 if (mad_send_wr->refcount == 1) 1791 list_move_tail(&mad_send_wr->agent_list, 1792 &mad_send_wr->mad_agent_priv->done_list); 1793 } 1794 1795 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv, 1796 struct ib_mad_recv_wc *mad_recv_wc) 1797 { 1798 struct ib_mad_send_wr_private *mad_send_wr; 1799 struct ib_mad_send_wc mad_send_wc; 1800 unsigned long flags; 1801 1802 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list); 1803 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list); 1804 if (mad_agent_priv->agent.rmpp_version) { 1805 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv, 1806 mad_recv_wc); 1807 if (!mad_recv_wc) { 1808 deref_mad_agent(mad_agent_priv); 1809 return; 1810 } 1811 } 1812 1813 /* Complete corresponding request */ 1814 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) { 1815 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1816 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc); 1817 if (!mad_send_wr) { 1818 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1819 ib_free_recv_mad(mad_recv_wc); 1820 deref_mad_agent(mad_agent_priv); 1821 return; 1822 } 1823 ib_mark_mad_done(mad_send_wr); 1824 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1825 1826 /* Defined behavior is to complete response before request */ 1827 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf; 1828 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, 1829 mad_recv_wc); 1830 atomic_dec(&mad_agent_priv->refcount); 1831 1832 mad_send_wc.status = IB_WC_SUCCESS; 1833 mad_send_wc.vendor_err = 0; 1834 mad_send_wc.send_buf = &mad_send_wr->send_buf; 1835 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 1836 } else { 1837 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, 1838 mad_recv_wc); 1839 deref_mad_agent(mad_agent_priv); 1840 } 1841 } 1842 1843 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv, 1844 struct ib_wc *wc) 1845 { 1846 struct ib_mad_qp_info *qp_info; 1847 struct ib_mad_private_header *mad_priv_hdr; 1848 struct ib_mad_private *recv, *response = NULL; 1849 struct ib_mad_list_head *mad_list; 1850 struct ib_mad_agent_private *mad_agent; 1851 int port_num; 1852 1853 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 1854 qp_info = mad_list->mad_queue->qp_info; 1855 dequeue_mad(mad_list); 1856 1857 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header, 1858 mad_list); 1859 recv = container_of(mad_priv_hdr, struct ib_mad_private, header); 1860 ib_dma_unmap_single(port_priv->device, 1861 recv->header.mapping, 1862 sizeof(struct ib_mad_private) - 1863 sizeof(struct ib_mad_private_header), 1864 DMA_FROM_DEVICE); 1865 1866 /* Setup MAD receive work completion from "normal" work completion */ 1867 recv->header.wc = *wc; 1868 recv->header.recv_wc.wc = &recv->header.wc; 1869 recv->header.recv_wc.mad_len = sizeof(struct ib_mad); 1870 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad; 1871 recv->header.recv_wc.recv_buf.grh = &recv->grh; 1872 1873 if (atomic_read(&qp_info->snoop_count)) 1874 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS); 1875 1876 /* Validate MAD */ 1877 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num)) 1878 goto out; 1879 1880 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL); 1881 if (!response) { 1882 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory " 1883 "for response buffer\n"); 1884 goto out; 1885 } 1886 1887 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) 1888 port_num = wc->port_num; 1889 else 1890 port_num = port_priv->port_num; 1891 1892 if (recv->mad.mad.mad_hdr.mgmt_class == 1893 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 1894 enum smi_forward_action retsmi; 1895 1896 if (smi_handle_dr_smp_recv(&recv->mad.smp, 1897 port_priv->device->node_type, 1898 port_num, 1899 port_priv->device->phys_port_cnt) == 1900 IB_SMI_DISCARD) 1901 goto out; 1902 1903 retsmi = smi_check_forward_dr_smp(&recv->mad.smp); 1904 if (retsmi == IB_SMI_LOCAL) 1905 goto local; 1906 1907 if (retsmi == IB_SMI_SEND) { /* don't forward */ 1908 if (smi_handle_dr_smp_send(&recv->mad.smp, 1909 port_priv->device->node_type, 1910 port_num) == IB_SMI_DISCARD) 1911 goto out; 1912 1913 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD) 1914 goto out; 1915 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) { 1916 /* forward case for switches */ 1917 memcpy(response, recv, sizeof(*response)); 1918 response->header.recv_wc.wc = &response->header.wc; 1919 response->header.recv_wc.recv_buf.mad = &response->mad.mad; 1920 response->header.recv_wc.recv_buf.grh = &response->grh; 1921 1922 agent_send_response(&response->mad.mad, 1923 &response->grh, wc, 1924 port_priv->device, 1925 smi_get_fwd_port(&recv->mad.smp), 1926 qp_info->qp->qp_num); 1927 1928 goto out; 1929 } 1930 } 1931 1932 local: 1933 /* Give driver "right of first refusal" on incoming MAD */ 1934 if (port_priv->device->process_mad) { 1935 int ret; 1936 1937 ret = port_priv->device->process_mad(port_priv->device, 0, 1938 port_priv->port_num, 1939 wc, &recv->grh, 1940 &recv->mad.mad, 1941 &response->mad.mad); 1942 if (ret & IB_MAD_RESULT_SUCCESS) { 1943 if (ret & IB_MAD_RESULT_CONSUMED) 1944 goto out; 1945 if (ret & IB_MAD_RESULT_REPLY) { 1946 agent_send_response(&response->mad.mad, 1947 &recv->grh, wc, 1948 port_priv->device, 1949 port_num, 1950 qp_info->qp->qp_num); 1951 goto out; 1952 } 1953 } 1954 } 1955 1956 mad_agent = find_mad_agent(port_priv, &recv->mad.mad); 1957 if (mad_agent) { 1958 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc); 1959 /* 1960 * recv is freed up in error cases in ib_mad_complete_recv 1961 * or via recv_handler in ib_mad_complete_recv() 1962 */ 1963 recv = NULL; 1964 } 1965 1966 out: 1967 /* Post another receive request for this QP */ 1968 if (response) { 1969 ib_mad_post_receive_mads(qp_info, response); 1970 if (recv) 1971 kmem_cache_free(ib_mad_cache, recv); 1972 } else 1973 ib_mad_post_receive_mads(qp_info, recv); 1974 } 1975 1976 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv) 1977 { 1978 struct ib_mad_send_wr_private *mad_send_wr; 1979 unsigned long delay; 1980 1981 if (list_empty(&mad_agent_priv->wait_list)) { 1982 cancel_delayed_work(&mad_agent_priv->timed_work); 1983 } else { 1984 mad_send_wr = list_entry(mad_agent_priv->wait_list.next, 1985 struct ib_mad_send_wr_private, 1986 agent_list); 1987 1988 if (time_after(mad_agent_priv->timeout, 1989 mad_send_wr->timeout)) { 1990 mad_agent_priv->timeout = mad_send_wr->timeout; 1991 cancel_delayed_work(&mad_agent_priv->timed_work); 1992 delay = mad_send_wr->timeout - jiffies; 1993 if ((long)delay <= 0) 1994 delay = 1; 1995 queue_delayed_work(mad_agent_priv->qp_info-> 1996 port_priv->wq, 1997 &mad_agent_priv->timed_work, delay); 1998 } 1999 } 2000 } 2001 2002 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr) 2003 { 2004 struct ib_mad_agent_private *mad_agent_priv; 2005 struct ib_mad_send_wr_private *temp_mad_send_wr; 2006 struct list_head *list_item; 2007 unsigned long delay; 2008 2009 mad_agent_priv = mad_send_wr->mad_agent_priv; 2010 list_del(&mad_send_wr->agent_list); 2011 2012 delay = mad_send_wr->timeout; 2013 mad_send_wr->timeout += jiffies; 2014 2015 if (delay) { 2016 list_for_each_prev(list_item, &mad_agent_priv->wait_list) { 2017 temp_mad_send_wr = list_entry(list_item, 2018 struct ib_mad_send_wr_private, 2019 agent_list); 2020 if (time_after(mad_send_wr->timeout, 2021 temp_mad_send_wr->timeout)) 2022 break; 2023 } 2024 } 2025 else 2026 list_item = &mad_agent_priv->wait_list; 2027 list_add(&mad_send_wr->agent_list, list_item); 2028 2029 /* Reschedule a work item if we have a shorter timeout */ 2030 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) { 2031 cancel_delayed_work(&mad_agent_priv->timed_work); 2032 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq, 2033 &mad_agent_priv->timed_work, delay); 2034 } 2035 } 2036 2037 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr, 2038 int timeout_ms) 2039 { 2040 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2041 wait_for_response(mad_send_wr); 2042 } 2043 2044 /* 2045 * Process a send work completion 2046 */ 2047 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr, 2048 struct ib_mad_send_wc *mad_send_wc) 2049 { 2050 struct ib_mad_agent_private *mad_agent_priv; 2051 unsigned long flags; 2052 int ret; 2053 2054 mad_agent_priv = mad_send_wr->mad_agent_priv; 2055 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2056 if (mad_agent_priv->agent.rmpp_version) { 2057 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc); 2058 if (ret == IB_RMPP_RESULT_CONSUMED) 2059 goto done; 2060 } else 2061 ret = IB_RMPP_RESULT_UNHANDLED; 2062 2063 if (mad_send_wc->status != IB_WC_SUCCESS && 2064 mad_send_wr->status == IB_WC_SUCCESS) { 2065 mad_send_wr->status = mad_send_wc->status; 2066 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2067 } 2068 2069 if (--mad_send_wr->refcount > 0) { 2070 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout && 2071 mad_send_wr->status == IB_WC_SUCCESS) { 2072 wait_for_response(mad_send_wr); 2073 } 2074 goto done; 2075 } 2076 2077 /* Remove send from MAD agent and notify client of completion */ 2078 list_del(&mad_send_wr->agent_list); 2079 adjust_timeout(mad_agent_priv); 2080 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2081 2082 if (mad_send_wr->status != IB_WC_SUCCESS ) 2083 mad_send_wc->status = mad_send_wr->status; 2084 if (ret == IB_RMPP_RESULT_INTERNAL) 2085 ib_rmpp_send_handler(mad_send_wc); 2086 else 2087 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2088 mad_send_wc); 2089 2090 /* Release reference on agent taken when sending */ 2091 deref_mad_agent(mad_agent_priv); 2092 return; 2093 done: 2094 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2095 } 2096 2097 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv, 2098 struct ib_wc *wc) 2099 { 2100 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr; 2101 struct ib_mad_list_head *mad_list; 2102 struct ib_mad_qp_info *qp_info; 2103 struct ib_mad_queue *send_queue; 2104 struct ib_send_wr *bad_send_wr; 2105 struct ib_mad_send_wc mad_send_wc; 2106 unsigned long flags; 2107 int ret; 2108 2109 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 2110 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2111 mad_list); 2112 send_queue = mad_list->mad_queue; 2113 qp_info = send_queue->qp_info; 2114 2115 retry: 2116 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2117 mad_send_wr->header_mapping, 2118 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE); 2119 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2120 mad_send_wr->payload_mapping, 2121 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE); 2122 queued_send_wr = NULL; 2123 spin_lock_irqsave(&send_queue->lock, flags); 2124 list_del(&mad_list->list); 2125 2126 /* Move queued send to the send queue */ 2127 if (send_queue->count-- > send_queue->max_active) { 2128 mad_list = container_of(qp_info->overflow_list.next, 2129 struct ib_mad_list_head, list); 2130 queued_send_wr = container_of(mad_list, 2131 struct ib_mad_send_wr_private, 2132 mad_list); 2133 list_move_tail(&mad_list->list, &send_queue->list); 2134 } 2135 spin_unlock_irqrestore(&send_queue->lock, flags); 2136 2137 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2138 mad_send_wc.status = wc->status; 2139 mad_send_wc.vendor_err = wc->vendor_err; 2140 if (atomic_read(&qp_info->snoop_count)) 2141 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc, 2142 IB_MAD_SNOOP_SEND_COMPLETIONS); 2143 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 2144 2145 if (queued_send_wr) { 2146 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr, 2147 &bad_send_wr); 2148 if (ret) { 2149 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret); 2150 mad_send_wr = queued_send_wr; 2151 wc->status = IB_WC_LOC_QP_OP_ERR; 2152 goto retry; 2153 } 2154 } 2155 } 2156 2157 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info) 2158 { 2159 struct ib_mad_send_wr_private *mad_send_wr; 2160 struct ib_mad_list_head *mad_list; 2161 unsigned long flags; 2162 2163 spin_lock_irqsave(&qp_info->send_queue.lock, flags); 2164 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) { 2165 mad_send_wr = container_of(mad_list, 2166 struct ib_mad_send_wr_private, 2167 mad_list); 2168 mad_send_wr->retry = 1; 2169 } 2170 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); 2171 } 2172 2173 static void mad_error_handler(struct ib_mad_port_private *port_priv, 2174 struct ib_wc *wc) 2175 { 2176 struct ib_mad_list_head *mad_list; 2177 struct ib_mad_qp_info *qp_info; 2178 struct ib_mad_send_wr_private *mad_send_wr; 2179 int ret; 2180 2181 /* Determine if failure was a send or receive */ 2182 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 2183 qp_info = mad_list->mad_queue->qp_info; 2184 if (mad_list->mad_queue == &qp_info->recv_queue) 2185 /* 2186 * Receive errors indicate that the QP has entered the error 2187 * state - error handling/shutdown code will cleanup 2188 */ 2189 return; 2190 2191 /* 2192 * Send errors will transition the QP to SQE - move 2193 * QP to RTS and repost flushed work requests 2194 */ 2195 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2196 mad_list); 2197 if (wc->status == IB_WC_WR_FLUSH_ERR) { 2198 if (mad_send_wr->retry) { 2199 /* Repost send */ 2200 struct ib_send_wr *bad_send_wr; 2201 2202 mad_send_wr->retry = 0; 2203 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr, 2204 &bad_send_wr); 2205 if (ret) 2206 ib_mad_send_done_handler(port_priv, wc); 2207 } else 2208 ib_mad_send_done_handler(port_priv, wc); 2209 } else { 2210 struct ib_qp_attr *attr; 2211 2212 /* Transition QP to RTS and fail offending send */ 2213 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2214 if (attr) { 2215 attr->qp_state = IB_QPS_RTS; 2216 attr->cur_qp_state = IB_QPS_SQE; 2217 ret = ib_modify_qp(qp_info->qp, attr, 2218 IB_QP_STATE | IB_QP_CUR_STATE); 2219 kfree(attr); 2220 if (ret) 2221 printk(KERN_ERR PFX "mad_error_handler - " 2222 "ib_modify_qp to RTS : %d\n", ret); 2223 else 2224 mark_sends_for_retry(qp_info); 2225 } 2226 ib_mad_send_done_handler(port_priv, wc); 2227 } 2228 } 2229 2230 /* 2231 * IB MAD completion callback 2232 */ 2233 static void ib_mad_completion_handler(struct work_struct *work) 2234 { 2235 struct ib_mad_port_private *port_priv; 2236 struct ib_wc wc; 2237 2238 port_priv = container_of(work, struct ib_mad_port_private, work); 2239 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); 2240 2241 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) { 2242 if (wc.status == IB_WC_SUCCESS) { 2243 switch (wc.opcode) { 2244 case IB_WC_SEND: 2245 ib_mad_send_done_handler(port_priv, &wc); 2246 break; 2247 case IB_WC_RECV: 2248 ib_mad_recv_done_handler(port_priv, &wc); 2249 break; 2250 default: 2251 BUG_ON(1); 2252 break; 2253 } 2254 } else 2255 mad_error_handler(port_priv, &wc); 2256 } 2257 } 2258 2259 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv) 2260 { 2261 unsigned long flags; 2262 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr; 2263 struct ib_mad_send_wc mad_send_wc; 2264 struct list_head cancel_list; 2265 2266 INIT_LIST_HEAD(&cancel_list); 2267 2268 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2269 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2270 &mad_agent_priv->send_list, agent_list) { 2271 if (mad_send_wr->status == IB_WC_SUCCESS) { 2272 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2273 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2274 } 2275 } 2276 2277 /* Empty wait list to prevent receives from finding a request */ 2278 list_splice_init(&mad_agent_priv->wait_list, &cancel_list); 2279 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2280 2281 /* Report all cancelled requests */ 2282 mad_send_wc.status = IB_WC_WR_FLUSH_ERR; 2283 mad_send_wc.vendor_err = 0; 2284 2285 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2286 &cancel_list, agent_list) { 2287 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2288 list_del(&mad_send_wr->agent_list); 2289 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2290 &mad_send_wc); 2291 atomic_dec(&mad_agent_priv->refcount); 2292 } 2293 } 2294 2295 static struct ib_mad_send_wr_private* 2296 find_send_wr(struct ib_mad_agent_private *mad_agent_priv, 2297 struct ib_mad_send_buf *send_buf) 2298 { 2299 struct ib_mad_send_wr_private *mad_send_wr; 2300 2301 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list, 2302 agent_list) { 2303 if (&mad_send_wr->send_buf == send_buf) 2304 return mad_send_wr; 2305 } 2306 2307 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list, 2308 agent_list) { 2309 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) && 2310 &mad_send_wr->send_buf == send_buf) 2311 return mad_send_wr; 2312 } 2313 return NULL; 2314 } 2315 2316 int ib_modify_mad(struct ib_mad_agent *mad_agent, 2317 struct ib_mad_send_buf *send_buf, u32 timeout_ms) 2318 { 2319 struct ib_mad_agent_private *mad_agent_priv; 2320 struct ib_mad_send_wr_private *mad_send_wr; 2321 unsigned long flags; 2322 int active; 2323 2324 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, 2325 agent); 2326 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2327 mad_send_wr = find_send_wr(mad_agent_priv, send_buf); 2328 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) { 2329 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2330 return -EINVAL; 2331 } 2332 2333 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1); 2334 if (!timeout_ms) { 2335 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2336 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2337 } 2338 2339 mad_send_wr->send_buf.timeout_ms = timeout_ms; 2340 if (active) 2341 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2342 else 2343 ib_reset_mad_timeout(mad_send_wr, timeout_ms); 2344 2345 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2346 return 0; 2347 } 2348 EXPORT_SYMBOL(ib_modify_mad); 2349 2350 void ib_cancel_mad(struct ib_mad_agent *mad_agent, 2351 struct ib_mad_send_buf *send_buf) 2352 { 2353 ib_modify_mad(mad_agent, send_buf, 0); 2354 } 2355 EXPORT_SYMBOL(ib_cancel_mad); 2356 2357 static void local_completions(struct work_struct *work) 2358 { 2359 struct ib_mad_agent_private *mad_agent_priv; 2360 struct ib_mad_local_private *local; 2361 struct ib_mad_agent_private *recv_mad_agent; 2362 unsigned long flags; 2363 int recv = 0; 2364 struct ib_wc wc; 2365 struct ib_mad_send_wc mad_send_wc; 2366 2367 mad_agent_priv = 2368 container_of(work, struct ib_mad_agent_private, local_work); 2369 2370 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2371 while (!list_empty(&mad_agent_priv->local_list)) { 2372 local = list_entry(mad_agent_priv->local_list.next, 2373 struct ib_mad_local_private, 2374 completion_list); 2375 list_del(&local->completion_list); 2376 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2377 if (local->mad_priv) { 2378 recv_mad_agent = local->recv_mad_agent; 2379 if (!recv_mad_agent) { 2380 printk(KERN_ERR PFX "No receive MAD agent for local completion\n"); 2381 goto local_send_completion; 2382 } 2383 2384 recv = 1; 2385 /* 2386 * Defined behavior is to complete response 2387 * before request 2388 */ 2389 build_smp_wc(recv_mad_agent->agent.qp, 2390 (unsigned long) local->mad_send_wr, 2391 be16_to_cpu(IB_LID_PERMISSIVE), 2392 0, recv_mad_agent->agent.port_num, &wc); 2393 2394 local->mad_priv->header.recv_wc.wc = &wc; 2395 local->mad_priv->header.recv_wc.mad_len = 2396 sizeof(struct ib_mad); 2397 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list); 2398 list_add(&local->mad_priv->header.recv_wc.recv_buf.list, 2399 &local->mad_priv->header.recv_wc.rmpp_list); 2400 local->mad_priv->header.recv_wc.recv_buf.grh = NULL; 2401 local->mad_priv->header.recv_wc.recv_buf.mad = 2402 &local->mad_priv->mad.mad; 2403 if (atomic_read(&recv_mad_agent->qp_info->snoop_count)) 2404 snoop_recv(recv_mad_agent->qp_info, 2405 &local->mad_priv->header.recv_wc, 2406 IB_MAD_SNOOP_RECVS); 2407 recv_mad_agent->agent.recv_handler( 2408 &recv_mad_agent->agent, 2409 &local->mad_priv->header.recv_wc); 2410 spin_lock_irqsave(&recv_mad_agent->lock, flags); 2411 atomic_dec(&recv_mad_agent->refcount); 2412 spin_unlock_irqrestore(&recv_mad_agent->lock, flags); 2413 } 2414 2415 local_send_completion: 2416 /* Complete send */ 2417 mad_send_wc.status = IB_WC_SUCCESS; 2418 mad_send_wc.vendor_err = 0; 2419 mad_send_wc.send_buf = &local->mad_send_wr->send_buf; 2420 if (atomic_read(&mad_agent_priv->qp_info->snoop_count)) 2421 snoop_send(mad_agent_priv->qp_info, 2422 &local->mad_send_wr->send_buf, 2423 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS); 2424 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2425 &mad_send_wc); 2426 2427 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2428 atomic_dec(&mad_agent_priv->refcount); 2429 if (!recv) 2430 kmem_cache_free(ib_mad_cache, local->mad_priv); 2431 kfree(local); 2432 } 2433 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2434 } 2435 2436 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr) 2437 { 2438 int ret; 2439 2440 if (!mad_send_wr->retries_left) 2441 return -ETIMEDOUT; 2442 2443 mad_send_wr->retries_left--; 2444 mad_send_wr->send_buf.retries++; 2445 2446 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms); 2447 2448 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) { 2449 ret = ib_retry_rmpp(mad_send_wr); 2450 switch (ret) { 2451 case IB_RMPP_RESULT_UNHANDLED: 2452 ret = ib_send_mad(mad_send_wr); 2453 break; 2454 case IB_RMPP_RESULT_CONSUMED: 2455 ret = 0; 2456 break; 2457 default: 2458 ret = -ECOMM; 2459 break; 2460 } 2461 } else 2462 ret = ib_send_mad(mad_send_wr); 2463 2464 if (!ret) { 2465 mad_send_wr->refcount++; 2466 list_add_tail(&mad_send_wr->agent_list, 2467 &mad_send_wr->mad_agent_priv->send_list); 2468 } 2469 return ret; 2470 } 2471 2472 static void timeout_sends(struct work_struct *work) 2473 { 2474 struct ib_mad_agent_private *mad_agent_priv; 2475 struct ib_mad_send_wr_private *mad_send_wr; 2476 struct ib_mad_send_wc mad_send_wc; 2477 unsigned long flags, delay; 2478 2479 mad_agent_priv = container_of(work, struct ib_mad_agent_private, 2480 timed_work.work); 2481 mad_send_wc.vendor_err = 0; 2482 2483 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2484 while (!list_empty(&mad_agent_priv->wait_list)) { 2485 mad_send_wr = list_entry(mad_agent_priv->wait_list.next, 2486 struct ib_mad_send_wr_private, 2487 agent_list); 2488 2489 if (time_after(mad_send_wr->timeout, jiffies)) { 2490 delay = mad_send_wr->timeout - jiffies; 2491 if ((long)delay <= 0) 2492 delay = 1; 2493 queue_delayed_work(mad_agent_priv->qp_info-> 2494 port_priv->wq, 2495 &mad_agent_priv->timed_work, delay); 2496 break; 2497 } 2498 2499 list_del(&mad_send_wr->agent_list); 2500 if (mad_send_wr->status == IB_WC_SUCCESS && 2501 !retry_send(mad_send_wr)) 2502 continue; 2503 2504 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2505 2506 if (mad_send_wr->status == IB_WC_SUCCESS) 2507 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR; 2508 else 2509 mad_send_wc.status = mad_send_wr->status; 2510 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2511 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2512 &mad_send_wc); 2513 2514 atomic_dec(&mad_agent_priv->refcount); 2515 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2516 } 2517 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2518 } 2519 2520 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg) 2521 { 2522 struct ib_mad_port_private *port_priv = cq->cq_context; 2523 unsigned long flags; 2524 2525 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2526 if (!list_empty(&port_priv->port_list)) 2527 queue_work(port_priv->wq, &port_priv->work); 2528 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2529 } 2530 2531 /* 2532 * Allocate receive MADs and post receive WRs for them 2533 */ 2534 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info, 2535 struct ib_mad_private *mad) 2536 { 2537 unsigned long flags; 2538 int post, ret; 2539 struct ib_mad_private *mad_priv; 2540 struct ib_sge sg_list; 2541 struct ib_recv_wr recv_wr, *bad_recv_wr; 2542 struct ib_mad_queue *recv_queue = &qp_info->recv_queue; 2543 2544 /* Initialize common scatter list fields */ 2545 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header; 2546 sg_list.lkey = (*qp_info->port_priv->mr).lkey; 2547 2548 /* Initialize common receive WR fields */ 2549 recv_wr.next = NULL; 2550 recv_wr.sg_list = &sg_list; 2551 recv_wr.num_sge = 1; 2552 2553 do { 2554 /* Allocate and map receive buffer */ 2555 if (mad) { 2556 mad_priv = mad; 2557 mad = NULL; 2558 } else { 2559 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL); 2560 if (!mad_priv) { 2561 printk(KERN_ERR PFX "No memory for receive buffer\n"); 2562 ret = -ENOMEM; 2563 break; 2564 } 2565 } 2566 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device, 2567 &mad_priv->grh, 2568 sizeof *mad_priv - 2569 sizeof mad_priv->header, 2570 DMA_FROM_DEVICE); 2571 mad_priv->header.mapping = sg_list.addr; 2572 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list; 2573 mad_priv->header.mad_list.mad_queue = recv_queue; 2574 2575 /* Post receive WR */ 2576 spin_lock_irqsave(&recv_queue->lock, flags); 2577 post = (++recv_queue->count < recv_queue->max_active); 2578 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list); 2579 spin_unlock_irqrestore(&recv_queue->lock, flags); 2580 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr); 2581 if (ret) { 2582 spin_lock_irqsave(&recv_queue->lock, flags); 2583 list_del(&mad_priv->header.mad_list.list); 2584 recv_queue->count--; 2585 spin_unlock_irqrestore(&recv_queue->lock, flags); 2586 ib_dma_unmap_single(qp_info->port_priv->device, 2587 mad_priv->header.mapping, 2588 sizeof *mad_priv - 2589 sizeof mad_priv->header, 2590 DMA_FROM_DEVICE); 2591 kmem_cache_free(ib_mad_cache, mad_priv); 2592 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret); 2593 break; 2594 } 2595 } while (post); 2596 2597 return ret; 2598 } 2599 2600 /* 2601 * Return all the posted receive MADs 2602 */ 2603 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info) 2604 { 2605 struct ib_mad_private_header *mad_priv_hdr; 2606 struct ib_mad_private *recv; 2607 struct ib_mad_list_head *mad_list; 2608 2609 while (!list_empty(&qp_info->recv_queue.list)) { 2610 2611 mad_list = list_entry(qp_info->recv_queue.list.next, 2612 struct ib_mad_list_head, list); 2613 mad_priv_hdr = container_of(mad_list, 2614 struct ib_mad_private_header, 2615 mad_list); 2616 recv = container_of(mad_priv_hdr, struct ib_mad_private, 2617 header); 2618 2619 /* Remove from posted receive MAD list */ 2620 list_del(&mad_list->list); 2621 2622 ib_dma_unmap_single(qp_info->port_priv->device, 2623 recv->header.mapping, 2624 sizeof(struct ib_mad_private) - 2625 sizeof(struct ib_mad_private_header), 2626 DMA_FROM_DEVICE); 2627 kmem_cache_free(ib_mad_cache, recv); 2628 } 2629 2630 qp_info->recv_queue.count = 0; 2631 } 2632 2633 /* 2634 * Start the port 2635 */ 2636 static int ib_mad_port_start(struct ib_mad_port_private *port_priv) 2637 { 2638 int ret, i; 2639 struct ib_qp_attr *attr; 2640 struct ib_qp *qp; 2641 2642 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2643 if (!attr) { 2644 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n"); 2645 return -ENOMEM; 2646 } 2647 2648 for (i = 0; i < IB_MAD_QPS_CORE; i++) { 2649 qp = port_priv->qp_info[i].qp; 2650 /* 2651 * PKey index for QP1 is irrelevant but 2652 * one is needed for the Reset to Init transition 2653 */ 2654 attr->qp_state = IB_QPS_INIT; 2655 attr->pkey_index = 0; 2656 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY; 2657 ret = ib_modify_qp(qp, attr, IB_QP_STATE | 2658 IB_QP_PKEY_INDEX | IB_QP_QKEY); 2659 if (ret) { 2660 printk(KERN_ERR PFX "Couldn't change QP%d state to " 2661 "INIT: %d\n", i, ret); 2662 goto out; 2663 } 2664 2665 attr->qp_state = IB_QPS_RTR; 2666 ret = ib_modify_qp(qp, attr, IB_QP_STATE); 2667 if (ret) { 2668 printk(KERN_ERR PFX "Couldn't change QP%d state to " 2669 "RTR: %d\n", i, ret); 2670 goto out; 2671 } 2672 2673 attr->qp_state = IB_QPS_RTS; 2674 attr->sq_psn = IB_MAD_SEND_Q_PSN; 2675 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN); 2676 if (ret) { 2677 printk(KERN_ERR PFX "Couldn't change QP%d state to " 2678 "RTS: %d\n", i, ret); 2679 goto out; 2680 } 2681 } 2682 2683 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); 2684 if (ret) { 2685 printk(KERN_ERR PFX "Failed to request completion " 2686 "notification: %d\n", ret); 2687 goto out; 2688 } 2689 2690 for (i = 0; i < IB_MAD_QPS_CORE; i++) { 2691 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL); 2692 if (ret) { 2693 printk(KERN_ERR PFX "Couldn't post receive WRs\n"); 2694 goto out; 2695 } 2696 } 2697 out: 2698 kfree(attr); 2699 return ret; 2700 } 2701 2702 static void qp_event_handler(struct ib_event *event, void *qp_context) 2703 { 2704 struct ib_mad_qp_info *qp_info = qp_context; 2705 2706 /* It's worse than that! He's dead, Jim! */ 2707 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n", 2708 event->event, qp_info->qp->qp_num); 2709 } 2710 2711 static void init_mad_queue(struct ib_mad_qp_info *qp_info, 2712 struct ib_mad_queue *mad_queue) 2713 { 2714 mad_queue->qp_info = qp_info; 2715 mad_queue->count = 0; 2716 spin_lock_init(&mad_queue->lock); 2717 INIT_LIST_HEAD(&mad_queue->list); 2718 } 2719 2720 static void init_mad_qp(struct ib_mad_port_private *port_priv, 2721 struct ib_mad_qp_info *qp_info) 2722 { 2723 qp_info->port_priv = port_priv; 2724 init_mad_queue(qp_info, &qp_info->send_queue); 2725 init_mad_queue(qp_info, &qp_info->recv_queue); 2726 INIT_LIST_HEAD(&qp_info->overflow_list); 2727 spin_lock_init(&qp_info->snoop_lock); 2728 qp_info->snoop_table = NULL; 2729 qp_info->snoop_table_size = 0; 2730 atomic_set(&qp_info->snoop_count, 0); 2731 } 2732 2733 static int create_mad_qp(struct ib_mad_qp_info *qp_info, 2734 enum ib_qp_type qp_type) 2735 { 2736 struct ib_qp_init_attr qp_init_attr; 2737 int ret; 2738 2739 memset(&qp_init_attr, 0, sizeof qp_init_attr); 2740 qp_init_attr.send_cq = qp_info->port_priv->cq; 2741 qp_init_attr.recv_cq = qp_info->port_priv->cq; 2742 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR; 2743 qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE; 2744 qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE; 2745 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG; 2746 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG; 2747 qp_init_attr.qp_type = qp_type; 2748 qp_init_attr.port_num = qp_info->port_priv->port_num; 2749 qp_init_attr.qp_context = qp_info; 2750 qp_init_attr.event_handler = qp_event_handler; 2751 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr); 2752 if (IS_ERR(qp_info->qp)) { 2753 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n", 2754 get_spl_qp_index(qp_type)); 2755 ret = PTR_ERR(qp_info->qp); 2756 goto error; 2757 } 2758 /* Use minimum queue sizes unless the CQ is resized */ 2759 qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE; 2760 qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE; 2761 return 0; 2762 2763 error: 2764 return ret; 2765 } 2766 2767 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info) 2768 { 2769 ib_destroy_qp(qp_info->qp); 2770 kfree(qp_info->snoop_table); 2771 } 2772 2773 /* 2774 * Open the port 2775 * Create the QP, PD, MR, and CQ if needed 2776 */ 2777 static int ib_mad_port_open(struct ib_device *device, 2778 int port_num) 2779 { 2780 int ret, cq_size; 2781 struct ib_mad_port_private *port_priv; 2782 unsigned long flags; 2783 char name[sizeof "ib_mad123"]; 2784 2785 /* Create new device info */ 2786 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL); 2787 if (!port_priv) { 2788 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n"); 2789 return -ENOMEM; 2790 } 2791 2792 port_priv->device = device; 2793 port_priv->port_num = port_num; 2794 spin_lock_init(&port_priv->reg_lock); 2795 INIT_LIST_HEAD(&port_priv->agent_list); 2796 init_mad_qp(port_priv, &port_priv->qp_info[0]); 2797 init_mad_qp(port_priv, &port_priv->qp_info[1]); 2798 2799 cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2; 2800 port_priv->cq = ib_create_cq(port_priv->device, 2801 ib_mad_thread_completion_handler, 2802 NULL, port_priv, cq_size, 0); 2803 if (IS_ERR(port_priv->cq)) { 2804 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n"); 2805 ret = PTR_ERR(port_priv->cq); 2806 goto error3; 2807 } 2808 2809 port_priv->pd = ib_alloc_pd(device); 2810 if (IS_ERR(port_priv->pd)) { 2811 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n"); 2812 ret = PTR_ERR(port_priv->pd); 2813 goto error4; 2814 } 2815 2816 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE); 2817 if (IS_ERR(port_priv->mr)) { 2818 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n"); 2819 ret = PTR_ERR(port_priv->mr); 2820 goto error5; 2821 } 2822 2823 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI); 2824 if (ret) 2825 goto error6; 2826 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI); 2827 if (ret) 2828 goto error7; 2829 2830 snprintf(name, sizeof name, "ib_mad%d", port_num); 2831 port_priv->wq = create_singlethread_workqueue(name); 2832 if (!port_priv->wq) { 2833 ret = -ENOMEM; 2834 goto error8; 2835 } 2836 INIT_WORK(&port_priv->work, ib_mad_completion_handler); 2837 2838 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2839 list_add_tail(&port_priv->port_list, &ib_mad_port_list); 2840 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2841 2842 ret = ib_mad_port_start(port_priv); 2843 if (ret) { 2844 printk(KERN_ERR PFX "Couldn't start port\n"); 2845 goto error9; 2846 } 2847 2848 return 0; 2849 2850 error9: 2851 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2852 list_del_init(&port_priv->port_list); 2853 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2854 2855 destroy_workqueue(port_priv->wq); 2856 error8: 2857 destroy_mad_qp(&port_priv->qp_info[1]); 2858 error7: 2859 destroy_mad_qp(&port_priv->qp_info[0]); 2860 error6: 2861 ib_dereg_mr(port_priv->mr); 2862 error5: 2863 ib_dealloc_pd(port_priv->pd); 2864 error4: 2865 ib_destroy_cq(port_priv->cq); 2866 cleanup_recv_queue(&port_priv->qp_info[1]); 2867 cleanup_recv_queue(&port_priv->qp_info[0]); 2868 error3: 2869 kfree(port_priv); 2870 2871 return ret; 2872 } 2873 2874 /* 2875 * Close the port 2876 * If there are no classes using the port, free the port 2877 * resources (CQ, MR, PD, QP) and remove the port's info structure 2878 */ 2879 static int ib_mad_port_close(struct ib_device *device, int port_num) 2880 { 2881 struct ib_mad_port_private *port_priv; 2882 unsigned long flags; 2883 2884 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2885 port_priv = __ib_get_mad_port(device, port_num); 2886 if (port_priv == NULL) { 2887 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2888 printk(KERN_ERR PFX "Port %d not found\n", port_num); 2889 return -ENODEV; 2890 } 2891 list_del_init(&port_priv->port_list); 2892 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2893 2894 destroy_workqueue(port_priv->wq); 2895 destroy_mad_qp(&port_priv->qp_info[1]); 2896 destroy_mad_qp(&port_priv->qp_info[0]); 2897 ib_dereg_mr(port_priv->mr); 2898 ib_dealloc_pd(port_priv->pd); 2899 ib_destroy_cq(port_priv->cq); 2900 cleanup_recv_queue(&port_priv->qp_info[1]); 2901 cleanup_recv_queue(&port_priv->qp_info[0]); 2902 /* XXX: Handle deallocation of MAD registration tables */ 2903 2904 kfree(port_priv); 2905 2906 return 0; 2907 } 2908 2909 static void ib_mad_init_device(struct ib_device *device) 2910 { 2911 int start, end, i; 2912 2913 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 2914 return; 2915 2916 if (device->node_type == RDMA_NODE_IB_SWITCH) { 2917 start = 0; 2918 end = 0; 2919 } else { 2920 start = 1; 2921 end = device->phys_port_cnt; 2922 } 2923 2924 for (i = start; i <= end; i++) { 2925 if (ib_mad_port_open(device, i)) { 2926 printk(KERN_ERR PFX "Couldn't open %s port %d\n", 2927 device->name, i); 2928 goto error; 2929 } 2930 if (ib_agent_port_open(device, i)) { 2931 printk(KERN_ERR PFX "Couldn't open %s port %d " 2932 "for agents\n", 2933 device->name, i); 2934 goto error_agent; 2935 } 2936 } 2937 return; 2938 2939 error_agent: 2940 if (ib_mad_port_close(device, i)) 2941 printk(KERN_ERR PFX "Couldn't close %s port %d\n", 2942 device->name, i); 2943 2944 error: 2945 i--; 2946 2947 while (i >= start) { 2948 if (ib_agent_port_close(device, i)) 2949 printk(KERN_ERR PFX "Couldn't close %s port %d " 2950 "for agents\n", 2951 device->name, i); 2952 if (ib_mad_port_close(device, i)) 2953 printk(KERN_ERR PFX "Couldn't close %s port %d\n", 2954 device->name, i); 2955 i--; 2956 } 2957 } 2958 2959 static void ib_mad_remove_device(struct ib_device *device) 2960 { 2961 int i, num_ports, cur_port; 2962 2963 if (device->node_type == RDMA_NODE_IB_SWITCH) { 2964 num_ports = 1; 2965 cur_port = 0; 2966 } else { 2967 num_ports = device->phys_port_cnt; 2968 cur_port = 1; 2969 } 2970 for (i = 0; i < num_ports; i++, cur_port++) { 2971 if (ib_agent_port_close(device, cur_port)) 2972 printk(KERN_ERR PFX "Couldn't close %s port %d " 2973 "for agents\n", 2974 device->name, cur_port); 2975 if (ib_mad_port_close(device, cur_port)) 2976 printk(KERN_ERR PFX "Couldn't close %s port %d\n", 2977 device->name, cur_port); 2978 } 2979 } 2980 2981 static struct ib_client mad_client = { 2982 .name = "mad", 2983 .add = ib_mad_init_device, 2984 .remove = ib_mad_remove_device 2985 }; 2986 2987 static int __init ib_mad_init_module(void) 2988 { 2989 int ret; 2990 2991 spin_lock_init(&ib_mad_port_list_lock); 2992 2993 ib_mad_cache = kmem_cache_create("ib_mad", 2994 sizeof(struct ib_mad_private), 2995 0, 2996 SLAB_HWCACHE_ALIGN, 2997 NULL); 2998 if (!ib_mad_cache) { 2999 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n"); 3000 ret = -ENOMEM; 3001 goto error1; 3002 } 3003 3004 INIT_LIST_HEAD(&ib_mad_port_list); 3005 3006 if (ib_register_client(&mad_client)) { 3007 printk(KERN_ERR PFX "Couldn't register ib_mad client\n"); 3008 ret = -EINVAL; 3009 goto error2; 3010 } 3011 3012 return 0; 3013 3014 error2: 3015 kmem_cache_destroy(ib_mad_cache); 3016 error1: 3017 return ret; 3018 } 3019 3020 static void __exit ib_mad_cleanup_module(void) 3021 { 3022 ib_unregister_client(&mad_client); 3023 kmem_cache_destroy(ib_mad_cache); 3024 } 3025 3026 module_init(ib_mad_init_module); 3027 module_exit(ib_mad_cleanup_module); 3028 3029