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 = ((struct ib_mad *)(wr->send_buf.mad))-> 1701 mad_hdr.method & IB_MGMT_METHOD_RESP; 1702 rcv_resp = rwc->recv_buf.mad->mad_hdr.method & IB_MGMT_METHOD_RESP; 1703 1704 if (send_resp == rcv_resp) 1705 /* both requests, or both responses. GIDs different */ 1706 return 0; 1707 1708 if (ib_query_ah(wr->send_buf.ah, &attr)) 1709 /* Assume not equal, to avoid false positives. */ 1710 return 0; 1711 1712 if (!!(attr.ah_flags & IB_AH_GRH) != 1713 !!(rwc->wc->wc_flags & IB_WC_GRH)) 1714 /* one has GID, other does not. Assume different */ 1715 return 0; 1716 1717 if (!send_resp && rcv_resp) { 1718 /* is request/response. */ 1719 if (!(attr.ah_flags & IB_AH_GRH)) { 1720 if (ib_get_cached_lmc(device, port_num, &lmc)) 1721 return 0; 1722 return (!lmc || !((attr.src_path_bits ^ 1723 rwc->wc->dlid_path_bits) & 1724 ((1 << lmc) - 1))); 1725 } else { 1726 if (ib_get_cached_gid(device, port_num, 1727 attr.grh.sgid_index, &sgid)) 1728 return 0; 1729 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw, 1730 16); 1731 } 1732 } 1733 1734 if (!(attr.ah_flags & IB_AH_GRH)) 1735 return attr.dlid == rwc->wc->slid; 1736 else 1737 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw, 1738 16); 1739 } 1740 1741 static inline int is_direct(u8 class) 1742 { 1743 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE); 1744 } 1745 1746 struct ib_mad_send_wr_private* 1747 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv, 1748 struct ib_mad_recv_wc *wc) 1749 { 1750 struct ib_mad_send_wr_private *wr; 1751 struct ib_mad *mad; 1752 1753 mad = (struct ib_mad *)wc->recv_buf.mad; 1754 1755 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) { 1756 if ((wr->tid == mad->mad_hdr.tid) && 1757 rcv_has_same_class(wr, wc) && 1758 /* 1759 * Don't check GID for direct routed MADs. 1760 * These might have permissive LIDs. 1761 */ 1762 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) || 1763 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1764 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1765 } 1766 1767 /* 1768 * It's possible to receive the response before we've 1769 * been notified that the send has completed 1770 */ 1771 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) { 1772 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) && 1773 wr->tid == mad->mad_hdr.tid && 1774 wr->timeout && 1775 rcv_has_same_class(wr, wc) && 1776 /* 1777 * Don't check GID for direct routed MADs. 1778 * These might have permissive LIDs. 1779 */ 1780 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) || 1781 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1782 /* Verify request has not been canceled */ 1783 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1784 } 1785 return NULL; 1786 } 1787 1788 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr) 1789 { 1790 mad_send_wr->timeout = 0; 1791 if (mad_send_wr->refcount == 1) 1792 list_move_tail(&mad_send_wr->agent_list, 1793 &mad_send_wr->mad_agent_priv->done_list); 1794 } 1795 1796 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv, 1797 struct ib_mad_recv_wc *mad_recv_wc) 1798 { 1799 struct ib_mad_send_wr_private *mad_send_wr; 1800 struct ib_mad_send_wc mad_send_wc; 1801 unsigned long flags; 1802 1803 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list); 1804 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list); 1805 if (mad_agent_priv->agent.rmpp_version) { 1806 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv, 1807 mad_recv_wc); 1808 if (!mad_recv_wc) { 1809 deref_mad_agent(mad_agent_priv); 1810 return; 1811 } 1812 } 1813 1814 /* Complete corresponding request */ 1815 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) { 1816 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1817 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc); 1818 if (!mad_send_wr) { 1819 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1820 ib_free_recv_mad(mad_recv_wc); 1821 deref_mad_agent(mad_agent_priv); 1822 return; 1823 } 1824 ib_mark_mad_done(mad_send_wr); 1825 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1826 1827 /* Defined behavior is to complete response before request */ 1828 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf; 1829 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, 1830 mad_recv_wc); 1831 atomic_dec(&mad_agent_priv->refcount); 1832 1833 mad_send_wc.status = IB_WC_SUCCESS; 1834 mad_send_wc.vendor_err = 0; 1835 mad_send_wc.send_buf = &mad_send_wr->send_buf; 1836 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 1837 } else { 1838 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, 1839 mad_recv_wc); 1840 deref_mad_agent(mad_agent_priv); 1841 } 1842 } 1843 1844 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv, 1845 struct ib_wc *wc) 1846 { 1847 struct ib_mad_qp_info *qp_info; 1848 struct ib_mad_private_header *mad_priv_hdr; 1849 struct ib_mad_private *recv, *response = NULL; 1850 struct ib_mad_list_head *mad_list; 1851 struct ib_mad_agent_private *mad_agent; 1852 int port_num; 1853 1854 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 1855 qp_info = mad_list->mad_queue->qp_info; 1856 dequeue_mad(mad_list); 1857 1858 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header, 1859 mad_list); 1860 recv = container_of(mad_priv_hdr, struct ib_mad_private, header); 1861 ib_dma_unmap_single(port_priv->device, 1862 recv->header.mapping, 1863 sizeof(struct ib_mad_private) - 1864 sizeof(struct ib_mad_private_header), 1865 DMA_FROM_DEVICE); 1866 1867 /* Setup MAD receive work completion from "normal" work completion */ 1868 recv->header.wc = *wc; 1869 recv->header.recv_wc.wc = &recv->header.wc; 1870 recv->header.recv_wc.mad_len = sizeof(struct ib_mad); 1871 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad; 1872 recv->header.recv_wc.recv_buf.grh = &recv->grh; 1873 1874 if (atomic_read(&qp_info->snoop_count)) 1875 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS); 1876 1877 /* Validate MAD */ 1878 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num)) 1879 goto out; 1880 1881 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL); 1882 if (!response) { 1883 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory " 1884 "for response buffer\n"); 1885 goto out; 1886 } 1887 1888 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) 1889 port_num = wc->port_num; 1890 else 1891 port_num = port_priv->port_num; 1892 1893 if (recv->mad.mad.mad_hdr.mgmt_class == 1894 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 1895 enum smi_forward_action retsmi; 1896 1897 if (smi_handle_dr_smp_recv(&recv->mad.smp, 1898 port_priv->device->node_type, 1899 port_num, 1900 port_priv->device->phys_port_cnt) == 1901 IB_SMI_DISCARD) 1902 goto out; 1903 1904 retsmi = smi_check_forward_dr_smp(&recv->mad.smp); 1905 if (retsmi == IB_SMI_LOCAL) 1906 goto local; 1907 1908 if (retsmi == IB_SMI_SEND) { /* don't forward */ 1909 if (smi_handle_dr_smp_send(&recv->mad.smp, 1910 port_priv->device->node_type, 1911 port_num) == IB_SMI_DISCARD) 1912 goto out; 1913 1914 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD) 1915 goto out; 1916 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) { 1917 /* forward case for switches */ 1918 memcpy(response, recv, sizeof(*response)); 1919 response->header.recv_wc.wc = &response->header.wc; 1920 response->header.recv_wc.recv_buf.mad = &response->mad.mad; 1921 response->header.recv_wc.recv_buf.grh = &response->grh; 1922 1923 agent_send_response(&response->mad.mad, 1924 &response->grh, wc, 1925 port_priv->device, 1926 smi_get_fwd_port(&recv->mad.smp), 1927 qp_info->qp->qp_num); 1928 1929 goto out; 1930 } 1931 } 1932 1933 local: 1934 /* Give driver "right of first refusal" on incoming MAD */ 1935 if (port_priv->device->process_mad) { 1936 int ret; 1937 1938 ret = port_priv->device->process_mad(port_priv->device, 0, 1939 port_priv->port_num, 1940 wc, &recv->grh, 1941 &recv->mad.mad, 1942 &response->mad.mad); 1943 if (ret & IB_MAD_RESULT_SUCCESS) { 1944 if (ret & IB_MAD_RESULT_CONSUMED) 1945 goto out; 1946 if (ret & IB_MAD_RESULT_REPLY) { 1947 agent_send_response(&response->mad.mad, 1948 &recv->grh, wc, 1949 port_priv->device, 1950 port_num, 1951 qp_info->qp->qp_num); 1952 goto out; 1953 } 1954 } 1955 } 1956 1957 mad_agent = find_mad_agent(port_priv, &recv->mad.mad); 1958 if (mad_agent) { 1959 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc); 1960 /* 1961 * recv is freed up in error cases in ib_mad_complete_recv 1962 * or via recv_handler in ib_mad_complete_recv() 1963 */ 1964 recv = NULL; 1965 } 1966 1967 out: 1968 /* Post another receive request for this QP */ 1969 if (response) { 1970 ib_mad_post_receive_mads(qp_info, response); 1971 if (recv) 1972 kmem_cache_free(ib_mad_cache, recv); 1973 } else 1974 ib_mad_post_receive_mads(qp_info, recv); 1975 } 1976 1977 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv) 1978 { 1979 struct ib_mad_send_wr_private *mad_send_wr; 1980 unsigned long delay; 1981 1982 if (list_empty(&mad_agent_priv->wait_list)) { 1983 cancel_delayed_work(&mad_agent_priv->timed_work); 1984 } else { 1985 mad_send_wr = list_entry(mad_agent_priv->wait_list.next, 1986 struct ib_mad_send_wr_private, 1987 agent_list); 1988 1989 if (time_after(mad_agent_priv->timeout, 1990 mad_send_wr->timeout)) { 1991 mad_agent_priv->timeout = mad_send_wr->timeout; 1992 cancel_delayed_work(&mad_agent_priv->timed_work); 1993 delay = mad_send_wr->timeout - jiffies; 1994 if ((long)delay <= 0) 1995 delay = 1; 1996 queue_delayed_work(mad_agent_priv->qp_info-> 1997 port_priv->wq, 1998 &mad_agent_priv->timed_work, delay); 1999 } 2000 } 2001 } 2002 2003 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr) 2004 { 2005 struct ib_mad_agent_private *mad_agent_priv; 2006 struct ib_mad_send_wr_private *temp_mad_send_wr; 2007 struct list_head *list_item; 2008 unsigned long delay; 2009 2010 mad_agent_priv = mad_send_wr->mad_agent_priv; 2011 list_del(&mad_send_wr->agent_list); 2012 2013 delay = mad_send_wr->timeout; 2014 mad_send_wr->timeout += jiffies; 2015 2016 if (delay) { 2017 list_for_each_prev(list_item, &mad_agent_priv->wait_list) { 2018 temp_mad_send_wr = list_entry(list_item, 2019 struct ib_mad_send_wr_private, 2020 agent_list); 2021 if (time_after(mad_send_wr->timeout, 2022 temp_mad_send_wr->timeout)) 2023 break; 2024 } 2025 } 2026 else 2027 list_item = &mad_agent_priv->wait_list; 2028 list_add(&mad_send_wr->agent_list, list_item); 2029 2030 /* Reschedule a work item if we have a shorter timeout */ 2031 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) { 2032 cancel_delayed_work(&mad_agent_priv->timed_work); 2033 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq, 2034 &mad_agent_priv->timed_work, delay); 2035 } 2036 } 2037 2038 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr, 2039 int timeout_ms) 2040 { 2041 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2042 wait_for_response(mad_send_wr); 2043 } 2044 2045 /* 2046 * Process a send work completion 2047 */ 2048 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr, 2049 struct ib_mad_send_wc *mad_send_wc) 2050 { 2051 struct ib_mad_agent_private *mad_agent_priv; 2052 unsigned long flags; 2053 int ret; 2054 2055 mad_agent_priv = mad_send_wr->mad_agent_priv; 2056 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2057 if (mad_agent_priv->agent.rmpp_version) { 2058 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc); 2059 if (ret == IB_RMPP_RESULT_CONSUMED) 2060 goto done; 2061 } else 2062 ret = IB_RMPP_RESULT_UNHANDLED; 2063 2064 if (mad_send_wc->status != IB_WC_SUCCESS && 2065 mad_send_wr->status == IB_WC_SUCCESS) { 2066 mad_send_wr->status = mad_send_wc->status; 2067 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2068 } 2069 2070 if (--mad_send_wr->refcount > 0) { 2071 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout && 2072 mad_send_wr->status == IB_WC_SUCCESS) { 2073 wait_for_response(mad_send_wr); 2074 } 2075 goto done; 2076 } 2077 2078 /* Remove send from MAD agent and notify client of completion */ 2079 list_del(&mad_send_wr->agent_list); 2080 adjust_timeout(mad_agent_priv); 2081 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2082 2083 if (mad_send_wr->status != IB_WC_SUCCESS ) 2084 mad_send_wc->status = mad_send_wr->status; 2085 if (ret == IB_RMPP_RESULT_INTERNAL) 2086 ib_rmpp_send_handler(mad_send_wc); 2087 else 2088 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2089 mad_send_wc); 2090 2091 /* Release reference on agent taken when sending */ 2092 deref_mad_agent(mad_agent_priv); 2093 return; 2094 done: 2095 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2096 } 2097 2098 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv, 2099 struct ib_wc *wc) 2100 { 2101 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr; 2102 struct ib_mad_list_head *mad_list; 2103 struct ib_mad_qp_info *qp_info; 2104 struct ib_mad_queue *send_queue; 2105 struct ib_send_wr *bad_send_wr; 2106 struct ib_mad_send_wc mad_send_wc; 2107 unsigned long flags; 2108 int ret; 2109 2110 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 2111 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2112 mad_list); 2113 send_queue = mad_list->mad_queue; 2114 qp_info = send_queue->qp_info; 2115 2116 retry: 2117 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2118 mad_send_wr->header_mapping, 2119 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE); 2120 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2121 mad_send_wr->payload_mapping, 2122 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE); 2123 queued_send_wr = NULL; 2124 spin_lock_irqsave(&send_queue->lock, flags); 2125 list_del(&mad_list->list); 2126 2127 /* Move queued send to the send queue */ 2128 if (send_queue->count-- > send_queue->max_active) { 2129 mad_list = container_of(qp_info->overflow_list.next, 2130 struct ib_mad_list_head, list); 2131 queued_send_wr = container_of(mad_list, 2132 struct ib_mad_send_wr_private, 2133 mad_list); 2134 list_move_tail(&mad_list->list, &send_queue->list); 2135 } 2136 spin_unlock_irqrestore(&send_queue->lock, flags); 2137 2138 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2139 mad_send_wc.status = wc->status; 2140 mad_send_wc.vendor_err = wc->vendor_err; 2141 if (atomic_read(&qp_info->snoop_count)) 2142 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc, 2143 IB_MAD_SNOOP_SEND_COMPLETIONS); 2144 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 2145 2146 if (queued_send_wr) { 2147 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr, 2148 &bad_send_wr); 2149 if (ret) { 2150 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret); 2151 mad_send_wr = queued_send_wr; 2152 wc->status = IB_WC_LOC_QP_OP_ERR; 2153 goto retry; 2154 } 2155 } 2156 } 2157 2158 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info) 2159 { 2160 struct ib_mad_send_wr_private *mad_send_wr; 2161 struct ib_mad_list_head *mad_list; 2162 unsigned long flags; 2163 2164 spin_lock_irqsave(&qp_info->send_queue.lock, flags); 2165 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) { 2166 mad_send_wr = container_of(mad_list, 2167 struct ib_mad_send_wr_private, 2168 mad_list); 2169 mad_send_wr->retry = 1; 2170 } 2171 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); 2172 } 2173 2174 static void mad_error_handler(struct ib_mad_port_private *port_priv, 2175 struct ib_wc *wc) 2176 { 2177 struct ib_mad_list_head *mad_list; 2178 struct ib_mad_qp_info *qp_info; 2179 struct ib_mad_send_wr_private *mad_send_wr; 2180 int ret; 2181 2182 /* Determine if failure was a send or receive */ 2183 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 2184 qp_info = mad_list->mad_queue->qp_info; 2185 if (mad_list->mad_queue == &qp_info->recv_queue) 2186 /* 2187 * Receive errors indicate that the QP has entered the error 2188 * state - error handling/shutdown code will cleanup 2189 */ 2190 return; 2191 2192 /* 2193 * Send errors will transition the QP to SQE - move 2194 * QP to RTS and repost flushed work requests 2195 */ 2196 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2197 mad_list); 2198 if (wc->status == IB_WC_WR_FLUSH_ERR) { 2199 if (mad_send_wr->retry) { 2200 /* Repost send */ 2201 struct ib_send_wr *bad_send_wr; 2202 2203 mad_send_wr->retry = 0; 2204 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr, 2205 &bad_send_wr); 2206 if (ret) 2207 ib_mad_send_done_handler(port_priv, wc); 2208 } else 2209 ib_mad_send_done_handler(port_priv, wc); 2210 } else { 2211 struct ib_qp_attr *attr; 2212 2213 /* Transition QP to RTS and fail offending send */ 2214 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2215 if (attr) { 2216 attr->qp_state = IB_QPS_RTS; 2217 attr->cur_qp_state = IB_QPS_SQE; 2218 ret = ib_modify_qp(qp_info->qp, attr, 2219 IB_QP_STATE | IB_QP_CUR_STATE); 2220 kfree(attr); 2221 if (ret) 2222 printk(KERN_ERR PFX "mad_error_handler - " 2223 "ib_modify_qp to RTS : %d\n", ret); 2224 else 2225 mark_sends_for_retry(qp_info); 2226 } 2227 ib_mad_send_done_handler(port_priv, wc); 2228 } 2229 } 2230 2231 /* 2232 * IB MAD completion callback 2233 */ 2234 static void ib_mad_completion_handler(struct work_struct *work) 2235 { 2236 struct ib_mad_port_private *port_priv; 2237 struct ib_wc wc; 2238 2239 port_priv = container_of(work, struct ib_mad_port_private, work); 2240 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); 2241 2242 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) { 2243 if (wc.status == IB_WC_SUCCESS) { 2244 switch (wc.opcode) { 2245 case IB_WC_SEND: 2246 ib_mad_send_done_handler(port_priv, &wc); 2247 break; 2248 case IB_WC_RECV: 2249 ib_mad_recv_done_handler(port_priv, &wc); 2250 break; 2251 default: 2252 BUG_ON(1); 2253 break; 2254 } 2255 } else 2256 mad_error_handler(port_priv, &wc); 2257 } 2258 } 2259 2260 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv) 2261 { 2262 unsigned long flags; 2263 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr; 2264 struct ib_mad_send_wc mad_send_wc; 2265 struct list_head cancel_list; 2266 2267 INIT_LIST_HEAD(&cancel_list); 2268 2269 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2270 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2271 &mad_agent_priv->send_list, agent_list) { 2272 if (mad_send_wr->status == IB_WC_SUCCESS) { 2273 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2274 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2275 } 2276 } 2277 2278 /* Empty wait list to prevent receives from finding a request */ 2279 list_splice_init(&mad_agent_priv->wait_list, &cancel_list); 2280 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2281 2282 /* Report all cancelled requests */ 2283 mad_send_wc.status = IB_WC_WR_FLUSH_ERR; 2284 mad_send_wc.vendor_err = 0; 2285 2286 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2287 &cancel_list, agent_list) { 2288 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2289 list_del(&mad_send_wr->agent_list); 2290 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2291 &mad_send_wc); 2292 atomic_dec(&mad_agent_priv->refcount); 2293 } 2294 } 2295 2296 static struct ib_mad_send_wr_private* 2297 find_send_wr(struct ib_mad_agent_private *mad_agent_priv, 2298 struct ib_mad_send_buf *send_buf) 2299 { 2300 struct ib_mad_send_wr_private *mad_send_wr; 2301 2302 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list, 2303 agent_list) { 2304 if (&mad_send_wr->send_buf == send_buf) 2305 return mad_send_wr; 2306 } 2307 2308 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list, 2309 agent_list) { 2310 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) && 2311 &mad_send_wr->send_buf == send_buf) 2312 return mad_send_wr; 2313 } 2314 return NULL; 2315 } 2316 2317 int ib_modify_mad(struct ib_mad_agent *mad_agent, 2318 struct ib_mad_send_buf *send_buf, u32 timeout_ms) 2319 { 2320 struct ib_mad_agent_private *mad_agent_priv; 2321 struct ib_mad_send_wr_private *mad_send_wr; 2322 unsigned long flags; 2323 int active; 2324 2325 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, 2326 agent); 2327 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2328 mad_send_wr = find_send_wr(mad_agent_priv, send_buf); 2329 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) { 2330 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2331 return -EINVAL; 2332 } 2333 2334 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1); 2335 if (!timeout_ms) { 2336 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2337 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2338 } 2339 2340 mad_send_wr->send_buf.timeout_ms = timeout_ms; 2341 if (active) 2342 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2343 else 2344 ib_reset_mad_timeout(mad_send_wr, timeout_ms); 2345 2346 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2347 return 0; 2348 } 2349 EXPORT_SYMBOL(ib_modify_mad); 2350 2351 void ib_cancel_mad(struct ib_mad_agent *mad_agent, 2352 struct ib_mad_send_buf *send_buf) 2353 { 2354 ib_modify_mad(mad_agent, send_buf, 0); 2355 } 2356 EXPORT_SYMBOL(ib_cancel_mad); 2357 2358 static void local_completions(struct work_struct *work) 2359 { 2360 struct ib_mad_agent_private *mad_agent_priv; 2361 struct ib_mad_local_private *local; 2362 struct ib_mad_agent_private *recv_mad_agent; 2363 unsigned long flags; 2364 int recv = 0; 2365 struct ib_wc wc; 2366 struct ib_mad_send_wc mad_send_wc; 2367 2368 mad_agent_priv = 2369 container_of(work, struct ib_mad_agent_private, local_work); 2370 2371 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2372 while (!list_empty(&mad_agent_priv->local_list)) { 2373 local = list_entry(mad_agent_priv->local_list.next, 2374 struct ib_mad_local_private, 2375 completion_list); 2376 list_del(&local->completion_list); 2377 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2378 if (local->mad_priv) { 2379 recv_mad_agent = local->recv_mad_agent; 2380 if (!recv_mad_agent) { 2381 printk(KERN_ERR PFX "No receive MAD agent for local completion\n"); 2382 goto local_send_completion; 2383 } 2384 2385 recv = 1; 2386 /* 2387 * Defined behavior is to complete response 2388 * before request 2389 */ 2390 build_smp_wc(recv_mad_agent->agent.qp, 2391 (unsigned long) local->mad_send_wr, 2392 be16_to_cpu(IB_LID_PERMISSIVE), 2393 0, recv_mad_agent->agent.port_num, &wc); 2394 2395 local->mad_priv->header.recv_wc.wc = &wc; 2396 local->mad_priv->header.recv_wc.mad_len = 2397 sizeof(struct ib_mad); 2398 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list); 2399 list_add(&local->mad_priv->header.recv_wc.recv_buf.list, 2400 &local->mad_priv->header.recv_wc.rmpp_list); 2401 local->mad_priv->header.recv_wc.recv_buf.grh = NULL; 2402 local->mad_priv->header.recv_wc.recv_buf.mad = 2403 &local->mad_priv->mad.mad; 2404 if (atomic_read(&recv_mad_agent->qp_info->snoop_count)) 2405 snoop_recv(recv_mad_agent->qp_info, 2406 &local->mad_priv->header.recv_wc, 2407 IB_MAD_SNOOP_RECVS); 2408 recv_mad_agent->agent.recv_handler( 2409 &recv_mad_agent->agent, 2410 &local->mad_priv->header.recv_wc); 2411 spin_lock_irqsave(&recv_mad_agent->lock, flags); 2412 atomic_dec(&recv_mad_agent->refcount); 2413 spin_unlock_irqrestore(&recv_mad_agent->lock, flags); 2414 } 2415 2416 local_send_completion: 2417 /* Complete send */ 2418 mad_send_wc.status = IB_WC_SUCCESS; 2419 mad_send_wc.vendor_err = 0; 2420 mad_send_wc.send_buf = &local->mad_send_wr->send_buf; 2421 if (atomic_read(&mad_agent_priv->qp_info->snoop_count)) 2422 snoop_send(mad_agent_priv->qp_info, 2423 &local->mad_send_wr->send_buf, 2424 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS); 2425 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2426 &mad_send_wc); 2427 2428 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2429 atomic_dec(&mad_agent_priv->refcount); 2430 if (!recv) 2431 kmem_cache_free(ib_mad_cache, local->mad_priv); 2432 kfree(local); 2433 } 2434 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2435 } 2436 2437 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr) 2438 { 2439 int ret; 2440 2441 if (!mad_send_wr->retries_left) 2442 return -ETIMEDOUT; 2443 2444 mad_send_wr->retries_left--; 2445 mad_send_wr->send_buf.retries++; 2446 2447 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms); 2448 2449 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) { 2450 ret = ib_retry_rmpp(mad_send_wr); 2451 switch (ret) { 2452 case IB_RMPP_RESULT_UNHANDLED: 2453 ret = ib_send_mad(mad_send_wr); 2454 break; 2455 case IB_RMPP_RESULT_CONSUMED: 2456 ret = 0; 2457 break; 2458 default: 2459 ret = -ECOMM; 2460 break; 2461 } 2462 } else 2463 ret = ib_send_mad(mad_send_wr); 2464 2465 if (!ret) { 2466 mad_send_wr->refcount++; 2467 list_add_tail(&mad_send_wr->agent_list, 2468 &mad_send_wr->mad_agent_priv->send_list); 2469 } 2470 return ret; 2471 } 2472 2473 static void timeout_sends(struct work_struct *work) 2474 { 2475 struct ib_mad_agent_private *mad_agent_priv; 2476 struct ib_mad_send_wr_private *mad_send_wr; 2477 struct ib_mad_send_wc mad_send_wc; 2478 unsigned long flags, delay; 2479 2480 mad_agent_priv = container_of(work, struct ib_mad_agent_private, 2481 timed_work.work); 2482 mad_send_wc.vendor_err = 0; 2483 2484 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2485 while (!list_empty(&mad_agent_priv->wait_list)) { 2486 mad_send_wr = list_entry(mad_agent_priv->wait_list.next, 2487 struct ib_mad_send_wr_private, 2488 agent_list); 2489 2490 if (time_after(mad_send_wr->timeout, jiffies)) { 2491 delay = mad_send_wr->timeout - jiffies; 2492 if ((long)delay <= 0) 2493 delay = 1; 2494 queue_delayed_work(mad_agent_priv->qp_info-> 2495 port_priv->wq, 2496 &mad_agent_priv->timed_work, delay); 2497 break; 2498 } 2499 2500 list_del(&mad_send_wr->agent_list); 2501 if (mad_send_wr->status == IB_WC_SUCCESS && 2502 !retry_send(mad_send_wr)) 2503 continue; 2504 2505 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2506 2507 if (mad_send_wr->status == IB_WC_SUCCESS) 2508 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR; 2509 else 2510 mad_send_wc.status = mad_send_wr->status; 2511 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2512 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2513 &mad_send_wc); 2514 2515 atomic_dec(&mad_agent_priv->refcount); 2516 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2517 } 2518 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2519 } 2520 2521 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg) 2522 { 2523 struct ib_mad_port_private *port_priv = cq->cq_context; 2524 unsigned long flags; 2525 2526 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2527 if (!list_empty(&port_priv->port_list)) 2528 queue_work(port_priv->wq, &port_priv->work); 2529 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2530 } 2531 2532 /* 2533 * Allocate receive MADs and post receive WRs for them 2534 */ 2535 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info, 2536 struct ib_mad_private *mad) 2537 { 2538 unsigned long flags; 2539 int post, ret; 2540 struct ib_mad_private *mad_priv; 2541 struct ib_sge sg_list; 2542 struct ib_recv_wr recv_wr, *bad_recv_wr; 2543 struct ib_mad_queue *recv_queue = &qp_info->recv_queue; 2544 2545 /* Initialize common scatter list fields */ 2546 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header; 2547 sg_list.lkey = (*qp_info->port_priv->mr).lkey; 2548 2549 /* Initialize common receive WR fields */ 2550 recv_wr.next = NULL; 2551 recv_wr.sg_list = &sg_list; 2552 recv_wr.num_sge = 1; 2553 2554 do { 2555 /* Allocate and map receive buffer */ 2556 if (mad) { 2557 mad_priv = mad; 2558 mad = NULL; 2559 } else { 2560 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL); 2561 if (!mad_priv) { 2562 printk(KERN_ERR PFX "No memory for receive buffer\n"); 2563 ret = -ENOMEM; 2564 break; 2565 } 2566 } 2567 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device, 2568 &mad_priv->grh, 2569 sizeof *mad_priv - 2570 sizeof mad_priv->header, 2571 DMA_FROM_DEVICE); 2572 mad_priv->header.mapping = sg_list.addr; 2573 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list; 2574 mad_priv->header.mad_list.mad_queue = recv_queue; 2575 2576 /* Post receive WR */ 2577 spin_lock_irqsave(&recv_queue->lock, flags); 2578 post = (++recv_queue->count < recv_queue->max_active); 2579 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list); 2580 spin_unlock_irqrestore(&recv_queue->lock, flags); 2581 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr); 2582 if (ret) { 2583 spin_lock_irqsave(&recv_queue->lock, flags); 2584 list_del(&mad_priv->header.mad_list.list); 2585 recv_queue->count--; 2586 spin_unlock_irqrestore(&recv_queue->lock, flags); 2587 ib_dma_unmap_single(qp_info->port_priv->device, 2588 mad_priv->header.mapping, 2589 sizeof *mad_priv - 2590 sizeof mad_priv->header, 2591 DMA_FROM_DEVICE); 2592 kmem_cache_free(ib_mad_cache, mad_priv); 2593 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret); 2594 break; 2595 } 2596 } while (post); 2597 2598 return ret; 2599 } 2600 2601 /* 2602 * Return all the posted receive MADs 2603 */ 2604 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info) 2605 { 2606 struct ib_mad_private_header *mad_priv_hdr; 2607 struct ib_mad_private *recv; 2608 struct ib_mad_list_head *mad_list; 2609 2610 while (!list_empty(&qp_info->recv_queue.list)) { 2611 2612 mad_list = list_entry(qp_info->recv_queue.list.next, 2613 struct ib_mad_list_head, list); 2614 mad_priv_hdr = container_of(mad_list, 2615 struct ib_mad_private_header, 2616 mad_list); 2617 recv = container_of(mad_priv_hdr, struct ib_mad_private, 2618 header); 2619 2620 /* Remove from posted receive MAD list */ 2621 list_del(&mad_list->list); 2622 2623 ib_dma_unmap_single(qp_info->port_priv->device, 2624 recv->header.mapping, 2625 sizeof(struct ib_mad_private) - 2626 sizeof(struct ib_mad_private_header), 2627 DMA_FROM_DEVICE); 2628 kmem_cache_free(ib_mad_cache, recv); 2629 } 2630 2631 qp_info->recv_queue.count = 0; 2632 } 2633 2634 /* 2635 * Start the port 2636 */ 2637 static int ib_mad_port_start(struct ib_mad_port_private *port_priv) 2638 { 2639 int ret, i; 2640 struct ib_qp_attr *attr; 2641 struct ib_qp *qp; 2642 2643 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2644 if (!attr) { 2645 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n"); 2646 return -ENOMEM; 2647 } 2648 2649 for (i = 0; i < IB_MAD_QPS_CORE; i++) { 2650 qp = port_priv->qp_info[i].qp; 2651 /* 2652 * PKey index for QP1 is irrelevant but 2653 * one is needed for the Reset to Init transition 2654 */ 2655 attr->qp_state = IB_QPS_INIT; 2656 attr->pkey_index = 0; 2657 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY; 2658 ret = ib_modify_qp(qp, attr, IB_QP_STATE | 2659 IB_QP_PKEY_INDEX | IB_QP_QKEY); 2660 if (ret) { 2661 printk(KERN_ERR PFX "Couldn't change QP%d state to " 2662 "INIT: %d\n", i, ret); 2663 goto out; 2664 } 2665 2666 attr->qp_state = IB_QPS_RTR; 2667 ret = ib_modify_qp(qp, attr, IB_QP_STATE); 2668 if (ret) { 2669 printk(KERN_ERR PFX "Couldn't change QP%d state to " 2670 "RTR: %d\n", i, ret); 2671 goto out; 2672 } 2673 2674 attr->qp_state = IB_QPS_RTS; 2675 attr->sq_psn = IB_MAD_SEND_Q_PSN; 2676 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN); 2677 if (ret) { 2678 printk(KERN_ERR PFX "Couldn't change QP%d state to " 2679 "RTS: %d\n", i, ret); 2680 goto out; 2681 } 2682 } 2683 2684 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); 2685 if (ret) { 2686 printk(KERN_ERR PFX "Failed to request completion " 2687 "notification: %d\n", ret); 2688 goto out; 2689 } 2690 2691 for (i = 0; i < IB_MAD_QPS_CORE; i++) { 2692 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL); 2693 if (ret) { 2694 printk(KERN_ERR PFX "Couldn't post receive WRs\n"); 2695 goto out; 2696 } 2697 } 2698 out: 2699 kfree(attr); 2700 return ret; 2701 } 2702 2703 static void qp_event_handler(struct ib_event *event, void *qp_context) 2704 { 2705 struct ib_mad_qp_info *qp_info = qp_context; 2706 2707 /* It's worse than that! He's dead, Jim! */ 2708 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n", 2709 event->event, qp_info->qp->qp_num); 2710 } 2711 2712 static void init_mad_queue(struct ib_mad_qp_info *qp_info, 2713 struct ib_mad_queue *mad_queue) 2714 { 2715 mad_queue->qp_info = qp_info; 2716 mad_queue->count = 0; 2717 spin_lock_init(&mad_queue->lock); 2718 INIT_LIST_HEAD(&mad_queue->list); 2719 } 2720 2721 static void init_mad_qp(struct ib_mad_port_private *port_priv, 2722 struct ib_mad_qp_info *qp_info) 2723 { 2724 qp_info->port_priv = port_priv; 2725 init_mad_queue(qp_info, &qp_info->send_queue); 2726 init_mad_queue(qp_info, &qp_info->recv_queue); 2727 INIT_LIST_HEAD(&qp_info->overflow_list); 2728 spin_lock_init(&qp_info->snoop_lock); 2729 qp_info->snoop_table = NULL; 2730 qp_info->snoop_table_size = 0; 2731 atomic_set(&qp_info->snoop_count, 0); 2732 } 2733 2734 static int create_mad_qp(struct ib_mad_qp_info *qp_info, 2735 enum ib_qp_type qp_type) 2736 { 2737 struct ib_qp_init_attr qp_init_attr; 2738 int ret; 2739 2740 memset(&qp_init_attr, 0, sizeof qp_init_attr); 2741 qp_init_attr.send_cq = qp_info->port_priv->cq; 2742 qp_init_attr.recv_cq = qp_info->port_priv->cq; 2743 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR; 2744 qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE; 2745 qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE; 2746 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG; 2747 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG; 2748 qp_init_attr.qp_type = qp_type; 2749 qp_init_attr.port_num = qp_info->port_priv->port_num; 2750 qp_init_attr.qp_context = qp_info; 2751 qp_init_attr.event_handler = qp_event_handler; 2752 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr); 2753 if (IS_ERR(qp_info->qp)) { 2754 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n", 2755 get_spl_qp_index(qp_type)); 2756 ret = PTR_ERR(qp_info->qp); 2757 goto error; 2758 } 2759 /* Use minimum queue sizes unless the CQ is resized */ 2760 qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE; 2761 qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE; 2762 return 0; 2763 2764 error: 2765 return ret; 2766 } 2767 2768 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info) 2769 { 2770 ib_destroy_qp(qp_info->qp); 2771 kfree(qp_info->snoop_table); 2772 } 2773 2774 /* 2775 * Open the port 2776 * Create the QP, PD, MR, and CQ if needed 2777 */ 2778 static int ib_mad_port_open(struct ib_device *device, 2779 int port_num) 2780 { 2781 int ret, cq_size; 2782 struct ib_mad_port_private *port_priv; 2783 unsigned long flags; 2784 char name[sizeof "ib_mad123"]; 2785 2786 /* Create new device info */ 2787 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL); 2788 if (!port_priv) { 2789 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n"); 2790 return -ENOMEM; 2791 } 2792 2793 port_priv->device = device; 2794 port_priv->port_num = port_num; 2795 spin_lock_init(&port_priv->reg_lock); 2796 INIT_LIST_HEAD(&port_priv->agent_list); 2797 init_mad_qp(port_priv, &port_priv->qp_info[0]); 2798 init_mad_qp(port_priv, &port_priv->qp_info[1]); 2799 2800 cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2; 2801 port_priv->cq = ib_create_cq(port_priv->device, 2802 ib_mad_thread_completion_handler, 2803 NULL, port_priv, cq_size, 0); 2804 if (IS_ERR(port_priv->cq)) { 2805 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n"); 2806 ret = PTR_ERR(port_priv->cq); 2807 goto error3; 2808 } 2809 2810 port_priv->pd = ib_alloc_pd(device); 2811 if (IS_ERR(port_priv->pd)) { 2812 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n"); 2813 ret = PTR_ERR(port_priv->pd); 2814 goto error4; 2815 } 2816 2817 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE); 2818 if (IS_ERR(port_priv->mr)) { 2819 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n"); 2820 ret = PTR_ERR(port_priv->mr); 2821 goto error5; 2822 } 2823 2824 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI); 2825 if (ret) 2826 goto error6; 2827 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI); 2828 if (ret) 2829 goto error7; 2830 2831 snprintf(name, sizeof name, "ib_mad%d", port_num); 2832 port_priv->wq = create_singlethread_workqueue(name); 2833 if (!port_priv->wq) { 2834 ret = -ENOMEM; 2835 goto error8; 2836 } 2837 INIT_WORK(&port_priv->work, ib_mad_completion_handler); 2838 2839 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2840 list_add_tail(&port_priv->port_list, &ib_mad_port_list); 2841 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2842 2843 ret = ib_mad_port_start(port_priv); 2844 if (ret) { 2845 printk(KERN_ERR PFX "Couldn't start port\n"); 2846 goto error9; 2847 } 2848 2849 return 0; 2850 2851 error9: 2852 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2853 list_del_init(&port_priv->port_list); 2854 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2855 2856 destroy_workqueue(port_priv->wq); 2857 error8: 2858 destroy_mad_qp(&port_priv->qp_info[1]); 2859 error7: 2860 destroy_mad_qp(&port_priv->qp_info[0]); 2861 error6: 2862 ib_dereg_mr(port_priv->mr); 2863 error5: 2864 ib_dealloc_pd(port_priv->pd); 2865 error4: 2866 ib_destroy_cq(port_priv->cq); 2867 cleanup_recv_queue(&port_priv->qp_info[1]); 2868 cleanup_recv_queue(&port_priv->qp_info[0]); 2869 error3: 2870 kfree(port_priv); 2871 2872 return ret; 2873 } 2874 2875 /* 2876 * Close the port 2877 * If there are no classes using the port, free the port 2878 * resources (CQ, MR, PD, QP) and remove the port's info structure 2879 */ 2880 static int ib_mad_port_close(struct ib_device *device, int port_num) 2881 { 2882 struct ib_mad_port_private *port_priv; 2883 unsigned long flags; 2884 2885 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2886 port_priv = __ib_get_mad_port(device, port_num); 2887 if (port_priv == NULL) { 2888 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2889 printk(KERN_ERR PFX "Port %d not found\n", port_num); 2890 return -ENODEV; 2891 } 2892 list_del_init(&port_priv->port_list); 2893 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2894 2895 destroy_workqueue(port_priv->wq); 2896 destroy_mad_qp(&port_priv->qp_info[1]); 2897 destroy_mad_qp(&port_priv->qp_info[0]); 2898 ib_dereg_mr(port_priv->mr); 2899 ib_dealloc_pd(port_priv->pd); 2900 ib_destroy_cq(port_priv->cq); 2901 cleanup_recv_queue(&port_priv->qp_info[1]); 2902 cleanup_recv_queue(&port_priv->qp_info[0]); 2903 /* XXX: Handle deallocation of MAD registration tables */ 2904 2905 kfree(port_priv); 2906 2907 return 0; 2908 } 2909 2910 static void ib_mad_init_device(struct ib_device *device) 2911 { 2912 int start, end, i; 2913 2914 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 2915 return; 2916 2917 if (device->node_type == RDMA_NODE_IB_SWITCH) { 2918 start = 0; 2919 end = 0; 2920 } else { 2921 start = 1; 2922 end = device->phys_port_cnt; 2923 } 2924 2925 for (i = start; i <= end; i++) { 2926 if (ib_mad_port_open(device, i)) { 2927 printk(KERN_ERR PFX "Couldn't open %s port %d\n", 2928 device->name, i); 2929 goto error; 2930 } 2931 if (ib_agent_port_open(device, i)) { 2932 printk(KERN_ERR PFX "Couldn't open %s port %d " 2933 "for agents\n", 2934 device->name, i); 2935 goto error_agent; 2936 } 2937 } 2938 return; 2939 2940 error_agent: 2941 if (ib_mad_port_close(device, i)) 2942 printk(KERN_ERR PFX "Couldn't close %s port %d\n", 2943 device->name, i); 2944 2945 error: 2946 i--; 2947 2948 while (i >= start) { 2949 if (ib_agent_port_close(device, i)) 2950 printk(KERN_ERR PFX "Couldn't close %s port %d " 2951 "for agents\n", 2952 device->name, i); 2953 if (ib_mad_port_close(device, i)) 2954 printk(KERN_ERR PFX "Couldn't close %s port %d\n", 2955 device->name, i); 2956 i--; 2957 } 2958 } 2959 2960 static void ib_mad_remove_device(struct ib_device *device) 2961 { 2962 int i, num_ports, cur_port; 2963 2964 if (device->node_type == RDMA_NODE_IB_SWITCH) { 2965 num_ports = 1; 2966 cur_port = 0; 2967 } else { 2968 num_ports = device->phys_port_cnt; 2969 cur_port = 1; 2970 } 2971 for (i = 0; i < num_ports; i++, cur_port++) { 2972 if (ib_agent_port_close(device, cur_port)) 2973 printk(KERN_ERR PFX "Couldn't close %s port %d " 2974 "for agents\n", 2975 device->name, cur_port); 2976 if (ib_mad_port_close(device, cur_port)) 2977 printk(KERN_ERR PFX "Couldn't close %s port %d\n", 2978 device->name, cur_port); 2979 } 2980 } 2981 2982 static struct ib_client mad_client = { 2983 .name = "mad", 2984 .add = ib_mad_init_device, 2985 .remove = ib_mad_remove_device 2986 }; 2987 2988 static int __init ib_mad_init_module(void) 2989 { 2990 int ret; 2991 2992 spin_lock_init(&ib_mad_port_list_lock); 2993 2994 ib_mad_cache = kmem_cache_create("ib_mad", 2995 sizeof(struct ib_mad_private), 2996 0, 2997 SLAB_HWCACHE_ALIGN, 2998 NULL); 2999 if (!ib_mad_cache) { 3000 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n"); 3001 ret = -ENOMEM; 3002 goto error1; 3003 } 3004 3005 INIT_LIST_HEAD(&ib_mad_port_list); 3006 3007 if (ib_register_client(&mad_client)) { 3008 printk(KERN_ERR PFX "Couldn't register ib_mad client\n"); 3009 ret = -EINVAL; 3010 goto error2; 3011 } 3012 3013 return 0; 3014 3015 error2: 3016 kmem_cache_destroy(ib_mad_cache); 3017 error1: 3018 return ret; 3019 } 3020 3021 static void __exit ib_mad_cleanup_module(void) 3022 { 3023 ib_unregister_client(&mad_client); 3024 kmem_cache_destroy(ib_mad_cache); 3025 } 3026 3027 module_init(ib_mad_init_module); 3028 module_exit(ib_mad_cleanup_module); 3029 3030