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 goto out; 706 707 local = kmalloc(sizeof *local, GFP_ATOMIC); 708 if (!local) { 709 ret = -ENOMEM; 710 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n"); 711 goto out; 712 } 713 local->mad_priv = NULL; 714 local->recv_mad_agent = NULL; 715 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC); 716 if (!mad_priv) { 717 ret = -ENOMEM; 718 printk(KERN_ERR PFX "No memory for local response MAD\n"); 719 kfree(local); 720 goto out; 721 } 722 723 build_smp_wc(mad_agent_priv->agent.qp, 724 send_wr->wr_id, be16_to_cpu(smp->dr_slid), 725 send_wr->wr.ud.pkey_index, 726 send_wr->wr.ud.port_num, &mad_wc); 727 728 /* No GRH for DR SMP */ 729 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL, 730 (struct ib_mad *)smp, 731 (struct ib_mad *)&mad_priv->mad); 732 switch (ret) 733 { 734 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY: 735 if (ib_response_mad(&mad_priv->mad.mad) && 736 mad_agent_priv->agent.recv_handler) { 737 local->mad_priv = mad_priv; 738 local->recv_mad_agent = mad_agent_priv; 739 /* 740 * Reference MAD agent until receive 741 * side of local completion handled 742 */ 743 atomic_inc(&mad_agent_priv->refcount); 744 } else 745 kmem_cache_free(ib_mad_cache, mad_priv); 746 break; 747 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED: 748 kmem_cache_free(ib_mad_cache, mad_priv); 749 break; 750 case IB_MAD_RESULT_SUCCESS: 751 /* Treat like an incoming receive MAD */ 752 port_priv = ib_get_mad_port(mad_agent_priv->agent.device, 753 mad_agent_priv->agent.port_num); 754 if (port_priv) { 755 mad_priv->mad.mad.mad_hdr.tid = 756 ((struct ib_mad *)smp)->mad_hdr.tid; 757 recv_mad_agent = find_mad_agent(port_priv, 758 &mad_priv->mad.mad); 759 } 760 if (!port_priv || !recv_mad_agent) { 761 kmem_cache_free(ib_mad_cache, mad_priv); 762 kfree(local); 763 ret = 0; 764 goto out; 765 } 766 local->mad_priv = mad_priv; 767 local->recv_mad_agent = recv_mad_agent; 768 break; 769 default: 770 kmem_cache_free(ib_mad_cache, mad_priv); 771 kfree(local); 772 ret = -EINVAL; 773 goto out; 774 } 775 776 local->mad_send_wr = mad_send_wr; 777 /* Reference MAD agent until send side of local completion handled */ 778 atomic_inc(&mad_agent_priv->refcount); 779 /* Queue local completion to local list */ 780 spin_lock_irqsave(&mad_agent_priv->lock, flags); 781 list_add_tail(&local->completion_list, &mad_agent_priv->local_list); 782 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 783 queue_work(mad_agent_priv->qp_info->port_priv->wq, 784 &mad_agent_priv->local_work); 785 ret = 1; 786 out: 787 return ret; 788 } 789 790 static int get_pad_size(int hdr_len, int data_len) 791 { 792 int seg_size, pad; 793 794 seg_size = sizeof(struct ib_mad) - hdr_len; 795 if (data_len && seg_size) { 796 pad = seg_size - data_len % seg_size; 797 return pad == seg_size ? 0 : pad; 798 } else 799 return seg_size; 800 } 801 802 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr) 803 { 804 struct ib_rmpp_segment *s, *t; 805 806 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) { 807 list_del(&s->list); 808 kfree(s); 809 } 810 } 811 812 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr, 813 gfp_t gfp_mask) 814 { 815 struct ib_mad_send_buf *send_buf = &send_wr->send_buf; 816 struct ib_rmpp_mad *rmpp_mad = send_buf->mad; 817 struct ib_rmpp_segment *seg = NULL; 818 int left, seg_size, pad; 819 820 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len; 821 seg_size = send_buf->seg_size; 822 pad = send_wr->pad; 823 824 /* Allocate data segments. */ 825 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) { 826 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask); 827 if (!seg) { 828 printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem " 829 "alloc failed for len %zd, gfp %#x\n", 830 sizeof (*seg) + seg_size, gfp_mask); 831 free_send_rmpp_list(send_wr); 832 return -ENOMEM; 833 } 834 seg->num = ++send_buf->seg_count; 835 list_add_tail(&seg->list, &send_wr->rmpp_list); 836 } 837 838 /* Zero any padding */ 839 if (pad) 840 memset(seg->data + seg_size - pad, 0, pad); 841 842 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv-> 843 agent.rmpp_version; 844 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA; 845 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 846 847 send_wr->cur_seg = container_of(send_wr->rmpp_list.next, 848 struct ib_rmpp_segment, list); 849 send_wr->last_ack_seg = send_wr->cur_seg; 850 return 0; 851 } 852 853 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent, 854 u32 remote_qpn, u16 pkey_index, 855 int rmpp_active, 856 int hdr_len, int data_len, 857 gfp_t gfp_mask) 858 { 859 struct ib_mad_agent_private *mad_agent_priv; 860 struct ib_mad_send_wr_private *mad_send_wr; 861 int pad, message_size, ret, size; 862 void *buf; 863 864 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, 865 agent); 866 pad = get_pad_size(hdr_len, data_len); 867 message_size = hdr_len + data_len + pad; 868 869 if ((!mad_agent->rmpp_version && 870 (rmpp_active || message_size > sizeof(struct ib_mad))) || 871 (!rmpp_active && message_size > sizeof(struct ib_mad))) 872 return ERR_PTR(-EINVAL); 873 874 size = rmpp_active ? hdr_len : sizeof(struct ib_mad); 875 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask); 876 if (!buf) 877 return ERR_PTR(-ENOMEM); 878 879 mad_send_wr = buf + size; 880 INIT_LIST_HEAD(&mad_send_wr->rmpp_list); 881 mad_send_wr->send_buf.mad = buf; 882 mad_send_wr->send_buf.hdr_len = hdr_len; 883 mad_send_wr->send_buf.data_len = data_len; 884 mad_send_wr->pad = pad; 885 886 mad_send_wr->mad_agent_priv = mad_agent_priv; 887 mad_send_wr->sg_list[0].length = hdr_len; 888 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey; 889 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len; 890 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey; 891 892 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr; 893 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list; 894 mad_send_wr->send_wr.num_sge = 2; 895 mad_send_wr->send_wr.opcode = IB_WR_SEND; 896 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED; 897 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn; 898 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY; 899 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index; 900 901 if (rmpp_active) { 902 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask); 903 if (ret) { 904 kfree(buf); 905 return ERR_PTR(ret); 906 } 907 } 908 909 mad_send_wr->send_buf.mad_agent = mad_agent; 910 atomic_inc(&mad_agent_priv->refcount); 911 return &mad_send_wr->send_buf; 912 } 913 EXPORT_SYMBOL(ib_create_send_mad); 914 915 int ib_get_mad_data_offset(u8 mgmt_class) 916 { 917 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM) 918 return IB_MGMT_SA_HDR; 919 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) || 920 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) || 921 (mgmt_class == IB_MGMT_CLASS_BIS)) 922 return IB_MGMT_DEVICE_HDR; 923 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && 924 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)) 925 return IB_MGMT_VENDOR_HDR; 926 else 927 return IB_MGMT_MAD_HDR; 928 } 929 EXPORT_SYMBOL(ib_get_mad_data_offset); 930 931 int ib_is_mad_class_rmpp(u8 mgmt_class) 932 { 933 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) || 934 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) || 935 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) || 936 (mgmt_class == IB_MGMT_CLASS_BIS) || 937 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && 938 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))) 939 return 1; 940 return 0; 941 } 942 EXPORT_SYMBOL(ib_is_mad_class_rmpp); 943 944 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num) 945 { 946 struct ib_mad_send_wr_private *mad_send_wr; 947 struct list_head *list; 948 949 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private, 950 send_buf); 951 list = &mad_send_wr->cur_seg->list; 952 953 if (mad_send_wr->cur_seg->num < seg_num) { 954 list_for_each_entry(mad_send_wr->cur_seg, list, list) 955 if (mad_send_wr->cur_seg->num == seg_num) 956 break; 957 } else if (mad_send_wr->cur_seg->num > seg_num) { 958 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list) 959 if (mad_send_wr->cur_seg->num == seg_num) 960 break; 961 } 962 return mad_send_wr->cur_seg->data; 963 } 964 EXPORT_SYMBOL(ib_get_rmpp_segment); 965 966 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr) 967 { 968 if (mad_send_wr->send_buf.seg_count) 969 return ib_get_rmpp_segment(&mad_send_wr->send_buf, 970 mad_send_wr->seg_num); 971 else 972 return mad_send_wr->send_buf.mad + 973 mad_send_wr->send_buf.hdr_len; 974 } 975 976 void ib_free_send_mad(struct ib_mad_send_buf *send_buf) 977 { 978 struct ib_mad_agent_private *mad_agent_priv; 979 struct ib_mad_send_wr_private *mad_send_wr; 980 981 mad_agent_priv = container_of(send_buf->mad_agent, 982 struct ib_mad_agent_private, agent); 983 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private, 984 send_buf); 985 986 free_send_rmpp_list(mad_send_wr); 987 kfree(send_buf->mad); 988 deref_mad_agent(mad_agent_priv); 989 } 990 EXPORT_SYMBOL(ib_free_send_mad); 991 992 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr) 993 { 994 struct ib_mad_qp_info *qp_info; 995 struct list_head *list; 996 struct ib_send_wr *bad_send_wr; 997 struct ib_mad_agent *mad_agent; 998 struct ib_sge *sge; 999 unsigned long flags; 1000 int ret; 1001 1002 /* Set WR ID to find mad_send_wr upon completion */ 1003 qp_info = mad_send_wr->mad_agent_priv->qp_info; 1004 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list; 1005 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue; 1006 1007 mad_agent = mad_send_wr->send_buf.mad_agent; 1008 sge = mad_send_wr->sg_list; 1009 sge[0].addr = ib_dma_map_single(mad_agent->device, 1010 mad_send_wr->send_buf.mad, 1011 sge[0].length, 1012 DMA_TO_DEVICE); 1013 mad_send_wr->header_mapping = sge[0].addr; 1014 1015 sge[1].addr = ib_dma_map_single(mad_agent->device, 1016 ib_get_payload(mad_send_wr), 1017 sge[1].length, 1018 DMA_TO_DEVICE); 1019 mad_send_wr->payload_mapping = sge[1].addr; 1020 1021 spin_lock_irqsave(&qp_info->send_queue.lock, flags); 1022 if (qp_info->send_queue.count < qp_info->send_queue.max_active) { 1023 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr, 1024 &bad_send_wr); 1025 list = &qp_info->send_queue.list; 1026 } else { 1027 ret = 0; 1028 list = &qp_info->overflow_list; 1029 } 1030 1031 if (!ret) { 1032 qp_info->send_queue.count++; 1033 list_add_tail(&mad_send_wr->mad_list.list, list); 1034 } 1035 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); 1036 if (ret) { 1037 ib_dma_unmap_single(mad_agent->device, 1038 mad_send_wr->header_mapping, 1039 sge[0].length, DMA_TO_DEVICE); 1040 ib_dma_unmap_single(mad_agent->device, 1041 mad_send_wr->payload_mapping, 1042 sge[1].length, DMA_TO_DEVICE); 1043 } 1044 return ret; 1045 } 1046 1047 /* 1048 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated 1049 * with the registered client 1050 */ 1051 int ib_post_send_mad(struct ib_mad_send_buf *send_buf, 1052 struct ib_mad_send_buf **bad_send_buf) 1053 { 1054 struct ib_mad_agent_private *mad_agent_priv; 1055 struct ib_mad_send_buf *next_send_buf; 1056 struct ib_mad_send_wr_private *mad_send_wr; 1057 unsigned long flags; 1058 int ret = -EINVAL; 1059 1060 /* Walk list of send WRs and post each on send list */ 1061 for (; send_buf; send_buf = next_send_buf) { 1062 1063 mad_send_wr = container_of(send_buf, 1064 struct ib_mad_send_wr_private, 1065 send_buf); 1066 mad_agent_priv = mad_send_wr->mad_agent_priv; 1067 1068 if (!send_buf->mad_agent->send_handler || 1069 (send_buf->timeout_ms && 1070 !send_buf->mad_agent->recv_handler)) { 1071 ret = -EINVAL; 1072 goto error; 1073 } 1074 1075 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) { 1076 if (mad_agent_priv->agent.rmpp_version) { 1077 ret = -EINVAL; 1078 goto error; 1079 } 1080 } 1081 1082 /* 1083 * Save pointer to next work request to post in case the 1084 * current one completes, and the user modifies the work 1085 * request associated with the completion 1086 */ 1087 next_send_buf = send_buf->next; 1088 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah; 1089 1090 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class == 1091 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 1092 ret = handle_outgoing_dr_smp(mad_agent_priv, 1093 mad_send_wr); 1094 if (ret < 0) /* error */ 1095 goto error; 1096 else if (ret == 1) /* locally consumed */ 1097 continue; 1098 } 1099 1100 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid; 1101 /* Timeout will be updated after send completes */ 1102 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms); 1103 mad_send_wr->retries = send_buf->retries; 1104 /* Reference for work request to QP + response */ 1105 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0); 1106 mad_send_wr->status = IB_WC_SUCCESS; 1107 1108 /* Reference MAD agent until send completes */ 1109 atomic_inc(&mad_agent_priv->refcount); 1110 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1111 list_add_tail(&mad_send_wr->agent_list, 1112 &mad_agent_priv->send_list); 1113 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1114 1115 if (mad_agent_priv->agent.rmpp_version) { 1116 ret = ib_send_rmpp_mad(mad_send_wr); 1117 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED) 1118 ret = ib_send_mad(mad_send_wr); 1119 } else 1120 ret = ib_send_mad(mad_send_wr); 1121 if (ret < 0) { 1122 /* Fail send request */ 1123 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1124 list_del(&mad_send_wr->agent_list); 1125 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1126 atomic_dec(&mad_agent_priv->refcount); 1127 goto error; 1128 } 1129 } 1130 return 0; 1131 error: 1132 if (bad_send_buf) 1133 *bad_send_buf = send_buf; 1134 return ret; 1135 } 1136 EXPORT_SYMBOL(ib_post_send_mad); 1137 1138 /* 1139 * ib_free_recv_mad - Returns data buffers used to receive 1140 * a MAD to the access layer 1141 */ 1142 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc) 1143 { 1144 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf; 1145 struct ib_mad_private_header *mad_priv_hdr; 1146 struct ib_mad_private *priv; 1147 struct list_head free_list; 1148 1149 INIT_LIST_HEAD(&free_list); 1150 list_splice_init(&mad_recv_wc->rmpp_list, &free_list); 1151 1152 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf, 1153 &free_list, list) { 1154 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc, 1155 recv_buf); 1156 mad_priv_hdr = container_of(mad_recv_wc, 1157 struct ib_mad_private_header, 1158 recv_wc); 1159 priv = container_of(mad_priv_hdr, struct ib_mad_private, 1160 header); 1161 kmem_cache_free(ib_mad_cache, priv); 1162 } 1163 } 1164 EXPORT_SYMBOL(ib_free_recv_mad); 1165 1166 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp, 1167 u8 rmpp_version, 1168 ib_mad_send_handler send_handler, 1169 ib_mad_recv_handler recv_handler, 1170 void *context) 1171 { 1172 return ERR_PTR(-EINVAL); /* XXX: for now */ 1173 } 1174 EXPORT_SYMBOL(ib_redirect_mad_qp); 1175 1176 int ib_process_mad_wc(struct ib_mad_agent *mad_agent, 1177 struct ib_wc *wc) 1178 { 1179 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n"); 1180 return 0; 1181 } 1182 EXPORT_SYMBOL(ib_process_mad_wc); 1183 1184 static int method_in_use(struct ib_mad_mgmt_method_table **method, 1185 struct ib_mad_reg_req *mad_reg_req) 1186 { 1187 int i; 1188 1189 for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS); 1190 i < IB_MGMT_MAX_METHODS; 1191 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS, 1192 1+i)) { 1193 if ((*method)->agent[i]) { 1194 printk(KERN_ERR PFX "Method %d already in use\n", i); 1195 return -EINVAL; 1196 } 1197 } 1198 return 0; 1199 } 1200 1201 static int allocate_method_table(struct ib_mad_mgmt_method_table **method) 1202 { 1203 /* Allocate management method table */ 1204 *method = kzalloc(sizeof **method, GFP_ATOMIC); 1205 if (!*method) { 1206 printk(KERN_ERR PFX "No memory for " 1207 "ib_mad_mgmt_method_table\n"); 1208 return -ENOMEM; 1209 } 1210 1211 return 0; 1212 } 1213 1214 /* 1215 * Check to see if there are any methods still in use 1216 */ 1217 static int check_method_table(struct ib_mad_mgmt_method_table *method) 1218 { 1219 int i; 1220 1221 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) 1222 if (method->agent[i]) 1223 return 1; 1224 return 0; 1225 } 1226 1227 /* 1228 * Check to see if there are any method tables for this class still in use 1229 */ 1230 static int check_class_table(struct ib_mad_mgmt_class_table *class) 1231 { 1232 int i; 1233 1234 for (i = 0; i < MAX_MGMT_CLASS; i++) 1235 if (class->method_table[i]) 1236 return 1; 1237 return 0; 1238 } 1239 1240 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class) 1241 { 1242 int i; 1243 1244 for (i = 0; i < MAX_MGMT_OUI; i++) 1245 if (vendor_class->method_table[i]) 1246 return 1; 1247 return 0; 1248 } 1249 1250 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class, 1251 char *oui) 1252 { 1253 int i; 1254 1255 for (i = 0; i < MAX_MGMT_OUI; i++) 1256 /* Is there matching OUI for this vendor class ? */ 1257 if (!memcmp(vendor_class->oui[i], oui, 3)) 1258 return i; 1259 1260 return -1; 1261 } 1262 1263 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor) 1264 { 1265 int i; 1266 1267 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++) 1268 if (vendor->vendor_class[i]) 1269 return 1; 1270 1271 return 0; 1272 } 1273 1274 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method, 1275 struct ib_mad_agent_private *agent) 1276 { 1277 int i; 1278 1279 /* Remove any methods for this mad agent */ 1280 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) { 1281 if (method->agent[i] == agent) { 1282 method->agent[i] = NULL; 1283 } 1284 } 1285 } 1286 1287 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req, 1288 struct ib_mad_agent_private *agent_priv, 1289 u8 mgmt_class) 1290 { 1291 struct ib_mad_port_private *port_priv; 1292 struct ib_mad_mgmt_class_table **class; 1293 struct ib_mad_mgmt_method_table **method; 1294 int i, ret; 1295 1296 port_priv = agent_priv->qp_info->port_priv; 1297 class = &port_priv->version[mad_reg_req->mgmt_class_version].class; 1298 if (!*class) { 1299 /* Allocate management class table for "new" class version */ 1300 *class = kzalloc(sizeof **class, GFP_ATOMIC); 1301 if (!*class) { 1302 printk(KERN_ERR PFX "No memory for " 1303 "ib_mad_mgmt_class_table\n"); 1304 ret = -ENOMEM; 1305 goto error1; 1306 } 1307 1308 /* Allocate method table for this management class */ 1309 method = &(*class)->method_table[mgmt_class]; 1310 if ((ret = allocate_method_table(method))) 1311 goto error2; 1312 } else { 1313 method = &(*class)->method_table[mgmt_class]; 1314 if (!*method) { 1315 /* Allocate method table for this management class */ 1316 if ((ret = allocate_method_table(method))) 1317 goto error1; 1318 } 1319 } 1320 1321 /* Now, make sure methods are not already in use */ 1322 if (method_in_use(method, mad_reg_req)) 1323 goto error3; 1324 1325 /* Finally, add in methods being registered */ 1326 for (i = find_first_bit(mad_reg_req->method_mask, 1327 IB_MGMT_MAX_METHODS); 1328 i < IB_MGMT_MAX_METHODS; 1329 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS, 1330 1+i)) { 1331 (*method)->agent[i] = agent_priv; 1332 } 1333 return 0; 1334 1335 error3: 1336 /* Remove any methods for this mad agent */ 1337 remove_methods_mad_agent(*method, agent_priv); 1338 /* Now, check to see if there are any methods in use */ 1339 if (!check_method_table(*method)) { 1340 /* If not, release management method table */ 1341 kfree(*method); 1342 *method = NULL; 1343 } 1344 ret = -EINVAL; 1345 goto error1; 1346 error2: 1347 kfree(*class); 1348 *class = NULL; 1349 error1: 1350 return ret; 1351 } 1352 1353 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req, 1354 struct ib_mad_agent_private *agent_priv) 1355 { 1356 struct ib_mad_port_private *port_priv; 1357 struct ib_mad_mgmt_vendor_class_table **vendor_table; 1358 struct ib_mad_mgmt_vendor_class_table *vendor = NULL; 1359 struct ib_mad_mgmt_vendor_class *vendor_class = NULL; 1360 struct ib_mad_mgmt_method_table **method; 1361 int i, ret = -ENOMEM; 1362 u8 vclass; 1363 1364 /* "New" vendor (with OUI) class */ 1365 vclass = vendor_class_index(mad_reg_req->mgmt_class); 1366 port_priv = agent_priv->qp_info->port_priv; 1367 vendor_table = &port_priv->version[ 1368 mad_reg_req->mgmt_class_version].vendor; 1369 if (!*vendor_table) { 1370 /* Allocate mgmt vendor class table for "new" class version */ 1371 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC); 1372 if (!vendor) { 1373 printk(KERN_ERR PFX "No memory for " 1374 "ib_mad_mgmt_vendor_class_table\n"); 1375 goto error1; 1376 } 1377 1378 *vendor_table = vendor; 1379 } 1380 if (!(*vendor_table)->vendor_class[vclass]) { 1381 /* Allocate table for this management vendor class */ 1382 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC); 1383 if (!vendor_class) { 1384 printk(KERN_ERR PFX "No memory for " 1385 "ib_mad_mgmt_vendor_class\n"); 1386 goto error2; 1387 } 1388 1389 (*vendor_table)->vendor_class[vclass] = vendor_class; 1390 } 1391 for (i = 0; i < MAX_MGMT_OUI; i++) { 1392 /* Is there matching OUI for this vendor class ? */ 1393 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i], 1394 mad_reg_req->oui, 3)) { 1395 method = &(*vendor_table)->vendor_class[ 1396 vclass]->method_table[i]; 1397 BUG_ON(!*method); 1398 goto check_in_use; 1399 } 1400 } 1401 for (i = 0; i < MAX_MGMT_OUI; i++) { 1402 /* OUI slot available ? */ 1403 if (!is_vendor_oui((*vendor_table)->vendor_class[ 1404 vclass]->oui[i])) { 1405 method = &(*vendor_table)->vendor_class[ 1406 vclass]->method_table[i]; 1407 BUG_ON(*method); 1408 /* Allocate method table for this OUI */ 1409 if ((ret = allocate_method_table(method))) 1410 goto error3; 1411 memcpy((*vendor_table)->vendor_class[vclass]->oui[i], 1412 mad_reg_req->oui, 3); 1413 goto check_in_use; 1414 } 1415 } 1416 printk(KERN_ERR PFX "All OUI slots in use\n"); 1417 goto error3; 1418 1419 check_in_use: 1420 /* Now, make sure methods are not already in use */ 1421 if (method_in_use(method, mad_reg_req)) 1422 goto error4; 1423 1424 /* Finally, add in methods being registered */ 1425 for (i = find_first_bit(mad_reg_req->method_mask, 1426 IB_MGMT_MAX_METHODS); 1427 i < IB_MGMT_MAX_METHODS; 1428 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS, 1429 1+i)) { 1430 (*method)->agent[i] = agent_priv; 1431 } 1432 return 0; 1433 1434 error4: 1435 /* Remove any methods for this mad agent */ 1436 remove_methods_mad_agent(*method, agent_priv); 1437 /* Now, check to see if there are any methods in use */ 1438 if (!check_method_table(*method)) { 1439 /* If not, release management method table */ 1440 kfree(*method); 1441 *method = NULL; 1442 } 1443 ret = -EINVAL; 1444 error3: 1445 if (vendor_class) { 1446 (*vendor_table)->vendor_class[vclass] = NULL; 1447 kfree(vendor_class); 1448 } 1449 error2: 1450 if (vendor) { 1451 *vendor_table = NULL; 1452 kfree(vendor); 1453 } 1454 error1: 1455 return ret; 1456 } 1457 1458 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv) 1459 { 1460 struct ib_mad_port_private *port_priv; 1461 struct ib_mad_mgmt_class_table *class; 1462 struct ib_mad_mgmt_method_table *method; 1463 struct ib_mad_mgmt_vendor_class_table *vendor; 1464 struct ib_mad_mgmt_vendor_class *vendor_class; 1465 int index; 1466 u8 mgmt_class; 1467 1468 /* 1469 * Was MAD registration request supplied 1470 * with original registration ? 1471 */ 1472 if (!agent_priv->reg_req) { 1473 goto out; 1474 } 1475 1476 port_priv = agent_priv->qp_info->port_priv; 1477 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class); 1478 class = port_priv->version[ 1479 agent_priv->reg_req->mgmt_class_version].class; 1480 if (!class) 1481 goto vendor_check; 1482 1483 method = class->method_table[mgmt_class]; 1484 if (method) { 1485 /* Remove any methods for this mad agent */ 1486 remove_methods_mad_agent(method, agent_priv); 1487 /* Now, check to see if there are any methods still in use */ 1488 if (!check_method_table(method)) { 1489 /* If not, release management method table */ 1490 kfree(method); 1491 class->method_table[mgmt_class] = NULL; 1492 /* Any management classes left ? */ 1493 if (!check_class_table(class)) { 1494 /* If not, release management class table */ 1495 kfree(class); 1496 port_priv->version[ 1497 agent_priv->reg_req-> 1498 mgmt_class_version].class = NULL; 1499 } 1500 } 1501 } 1502 1503 vendor_check: 1504 if (!is_vendor_class(mgmt_class)) 1505 goto out; 1506 1507 /* normalize mgmt_class to vendor range 2 */ 1508 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class); 1509 vendor = port_priv->version[ 1510 agent_priv->reg_req->mgmt_class_version].vendor; 1511 1512 if (!vendor) 1513 goto out; 1514 1515 vendor_class = vendor->vendor_class[mgmt_class]; 1516 if (vendor_class) { 1517 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui); 1518 if (index < 0) 1519 goto out; 1520 method = vendor_class->method_table[index]; 1521 if (method) { 1522 /* Remove any methods for this mad agent */ 1523 remove_methods_mad_agent(method, agent_priv); 1524 /* 1525 * Now, check to see if there are 1526 * any methods still in use 1527 */ 1528 if (!check_method_table(method)) { 1529 /* If not, release management method table */ 1530 kfree(method); 1531 vendor_class->method_table[index] = NULL; 1532 memset(vendor_class->oui[index], 0, 3); 1533 /* Any OUIs left ? */ 1534 if (!check_vendor_class(vendor_class)) { 1535 /* If not, release vendor class table */ 1536 kfree(vendor_class); 1537 vendor->vendor_class[mgmt_class] = NULL; 1538 /* Any other vendor classes left ? */ 1539 if (!check_vendor_table(vendor)) { 1540 kfree(vendor); 1541 port_priv->version[ 1542 agent_priv->reg_req-> 1543 mgmt_class_version]. 1544 vendor = NULL; 1545 } 1546 } 1547 } 1548 } 1549 } 1550 1551 out: 1552 return; 1553 } 1554 1555 static struct ib_mad_agent_private * 1556 find_mad_agent(struct ib_mad_port_private *port_priv, 1557 struct ib_mad *mad) 1558 { 1559 struct ib_mad_agent_private *mad_agent = NULL; 1560 unsigned long flags; 1561 1562 spin_lock_irqsave(&port_priv->reg_lock, flags); 1563 if (ib_response_mad(mad)) { 1564 u32 hi_tid; 1565 struct ib_mad_agent_private *entry; 1566 1567 /* 1568 * Routing is based on high 32 bits of transaction ID 1569 * of MAD. 1570 */ 1571 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32; 1572 list_for_each_entry(entry, &port_priv->agent_list, agent_list) { 1573 if (entry->agent.hi_tid == hi_tid) { 1574 mad_agent = entry; 1575 break; 1576 } 1577 } 1578 } else { 1579 struct ib_mad_mgmt_class_table *class; 1580 struct ib_mad_mgmt_method_table *method; 1581 struct ib_mad_mgmt_vendor_class_table *vendor; 1582 struct ib_mad_mgmt_vendor_class *vendor_class; 1583 struct ib_vendor_mad *vendor_mad; 1584 int index; 1585 1586 /* 1587 * Routing is based on version, class, and method 1588 * For "newer" vendor MADs, also based on OUI 1589 */ 1590 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION) 1591 goto out; 1592 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) { 1593 class = port_priv->version[ 1594 mad->mad_hdr.class_version].class; 1595 if (!class) 1596 goto out; 1597 method = class->method_table[convert_mgmt_class( 1598 mad->mad_hdr.mgmt_class)]; 1599 if (method) 1600 mad_agent = method->agent[mad->mad_hdr.method & 1601 ~IB_MGMT_METHOD_RESP]; 1602 } else { 1603 vendor = port_priv->version[ 1604 mad->mad_hdr.class_version].vendor; 1605 if (!vendor) 1606 goto out; 1607 vendor_class = vendor->vendor_class[vendor_class_index( 1608 mad->mad_hdr.mgmt_class)]; 1609 if (!vendor_class) 1610 goto out; 1611 /* Find matching OUI */ 1612 vendor_mad = (struct ib_vendor_mad *)mad; 1613 index = find_vendor_oui(vendor_class, vendor_mad->oui); 1614 if (index == -1) 1615 goto out; 1616 method = vendor_class->method_table[index]; 1617 if (method) { 1618 mad_agent = method->agent[mad->mad_hdr.method & 1619 ~IB_MGMT_METHOD_RESP]; 1620 } 1621 } 1622 } 1623 1624 if (mad_agent) { 1625 if (mad_agent->agent.recv_handler) 1626 atomic_inc(&mad_agent->refcount); 1627 else { 1628 printk(KERN_NOTICE PFX "No receive handler for client " 1629 "%p on port %d\n", 1630 &mad_agent->agent, port_priv->port_num); 1631 mad_agent = NULL; 1632 } 1633 } 1634 out: 1635 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 1636 1637 return mad_agent; 1638 } 1639 1640 static int validate_mad(struct ib_mad *mad, u32 qp_num) 1641 { 1642 int valid = 0; 1643 1644 /* Make sure MAD base version is understood */ 1645 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) { 1646 printk(KERN_ERR PFX "MAD received with unsupported base " 1647 "version %d\n", mad->mad_hdr.base_version); 1648 goto out; 1649 } 1650 1651 /* Filter SMI packets sent to other than QP0 */ 1652 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) || 1653 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) { 1654 if (qp_num == 0) 1655 valid = 1; 1656 } else { 1657 /* Filter GSI packets sent to QP0 */ 1658 if (qp_num != 0) 1659 valid = 1; 1660 } 1661 1662 out: 1663 return valid; 1664 } 1665 1666 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv, 1667 struct ib_mad_hdr *mad_hdr) 1668 { 1669 struct ib_rmpp_mad *rmpp_mad; 1670 1671 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr; 1672 return !mad_agent_priv->agent.rmpp_version || 1673 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 1674 IB_MGMT_RMPP_FLAG_ACTIVE) || 1675 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA); 1676 } 1677 1678 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr, 1679 struct ib_mad_recv_wc *rwc) 1680 { 1681 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class == 1682 rwc->recv_buf.mad->mad_hdr.mgmt_class; 1683 } 1684 1685 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv, 1686 struct ib_mad_send_wr_private *wr, 1687 struct ib_mad_recv_wc *rwc ) 1688 { 1689 struct ib_ah_attr attr; 1690 u8 send_resp, rcv_resp; 1691 union ib_gid sgid; 1692 struct ib_device *device = mad_agent_priv->agent.device; 1693 u8 port_num = mad_agent_priv->agent.port_num; 1694 u8 lmc; 1695 1696 send_resp = ((struct ib_mad *)(wr->send_buf.mad))-> 1697 mad_hdr.method & IB_MGMT_METHOD_RESP; 1698 rcv_resp = rwc->recv_buf.mad->mad_hdr.method & IB_MGMT_METHOD_RESP; 1699 1700 if (send_resp == rcv_resp) 1701 /* both requests, or both responses. GIDs different */ 1702 return 0; 1703 1704 if (ib_query_ah(wr->send_buf.ah, &attr)) 1705 /* Assume not equal, to avoid false positives. */ 1706 return 0; 1707 1708 if (!!(attr.ah_flags & IB_AH_GRH) != 1709 !!(rwc->wc->wc_flags & IB_WC_GRH)) 1710 /* one has GID, other does not. Assume different */ 1711 return 0; 1712 1713 if (!send_resp && rcv_resp) { 1714 /* is request/response. */ 1715 if (!(attr.ah_flags & IB_AH_GRH)) { 1716 if (ib_get_cached_lmc(device, port_num, &lmc)) 1717 return 0; 1718 return (!lmc || !((attr.src_path_bits ^ 1719 rwc->wc->dlid_path_bits) & 1720 ((1 << lmc) - 1))); 1721 } else { 1722 if (ib_get_cached_gid(device, port_num, 1723 attr.grh.sgid_index, &sgid)) 1724 return 0; 1725 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw, 1726 16); 1727 } 1728 } 1729 1730 if (!(attr.ah_flags & IB_AH_GRH)) 1731 return attr.dlid == rwc->wc->slid; 1732 else 1733 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw, 1734 16); 1735 } 1736 1737 static inline int is_direct(u8 class) 1738 { 1739 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE); 1740 } 1741 1742 struct ib_mad_send_wr_private* 1743 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv, 1744 struct ib_mad_recv_wc *wc) 1745 { 1746 struct ib_mad_send_wr_private *wr; 1747 struct ib_mad *mad; 1748 1749 mad = (struct ib_mad *)wc->recv_buf.mad; 1750 1751 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) { 1752 if ((wr->tid == mad->mad_hdr.tid) && 1753 rcv_has_same_class(wr, wc) && 1754 /* 1755 * Don't check GID for direct routed MADs. 1756 * These might have permissive LIDs. 1757 */ 1758 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) || 1759 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1760 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1761 } 1762 1763 /* 1764 * It's possible to receive the response before we've 1765 * been notified that the send has completed 1766 */ 1767 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) { 1768 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) && 1769 wr->tid == mad->mad_hdr.tid && 1770 wr->timeout && 1771 rcv_has_same_class(wr, wc) && 1772 /* 1773 * Don't check GID for direct routed MADs. 1774 * These might have permissive LIDs. 1775 */ 1776 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) || 1777 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1778 /* Verify request has not been canceled */ 1779 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1780 } 1781 return NULL; 1782 } 1783 1784 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr) 1785 { 1786 mad_send_wr->timeout = 0; 1787 if (mad_send_wr->refcount == 1) 1788 list_move_tail(&mad_send_wr->agent_list, 1789 &mad_send_wr->mad_agent_priv->done_list); 1790 } 1791 1792 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv, 1793 struct ib_mad_recv_wc *mad_recv_wc) 1794 { 1795 struct ib_mad_send_wr_private *mad_send_wr; 1796 struct ib_mad_send_wc mad_send_wc; 1797 unsigned long flags; 1798 1799 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list); 1800 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list); 1801 if (mad_agent_priv->agent.rmpp_version) { 1802 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv, 1803 mad_recv_wc); 1804 if (!mad_recv_wc) { 1805 deref_mad_agent(mad_agent_priv); 1806 return; 1807 } 1808 } 1809 1810 /* Complete corresponding request */ 1811 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) { 1812 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1813 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc); 1814 if (!mad_send_wr) { 1815 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1816 ib_free_recv_mad(mad_recv_wc); 1817 deref_mad_agent(mad_agent_priv); 1818 return; 1819 } 1820 ib_mark_mad_done(mad_send_wr); 1821 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1822 1823 /* Defined behavior is to complete response before request */ 1824 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf; 1825 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, 1826 mad_recv_wc); 1827 atomic_dec(&mad_agent_priv->refcount); 1828 1829 mad_send_wc.status = IB_WC_SUCCESS; 1830 mad_send_wc.vendor_err = 0; 1831 mad_send_wc.send_buf = &mad_send_wr->send_buf; 1832 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 1833 } else { 1834 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, 1835 mad_recv_wc); 1836 deref_mad_agent(mad_agent_priv); 1837 } 1838 } 1839 1840 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv, 1841 struct ib_wc *wc) 1842 { 1843 struct ib_mad_qp_info *qp_info; 1844 struct ib_mad_private_header *mad_priv_hdr; 1845 struct ib_mad_private *recv, *response = NULL; 1846 struct ib_mad_list_head *mad_list; 1847 struct ib_mad_agent_private *mad_agent; 1848 int port_num; 1849 1850 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 1851 qp_info = mad_list->mad_queue->qp_info; 1852 dequeue_mad(mad_list); 1853 1854 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header, 1855 mad_list); 1856 recv = container_of(mad_priv_hdr, struct ib_mad_private, header); 1857 ib_dma_unmap_single(port_priv->device, 1858 recv->header.mapping, 1859 sizeof(struct ib_mad_private) - 1860 sizeof(struct ib_mad_private_header), 1861 DMA_FROM_DEVICE); 1862 1863 /* Setup MAD receive work completion from "normal" work completion */ 1864 recv->header.wc = *wc; 1865 recv->header.recv_wc.wc = &recv->header.wc; 1866 recv->header.recv_wc.mad_len = sizeof(struct ib_mad); 1867 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad; 1868 recv->header.recv_wc.recv_buf.grh = &recv->grh; 1869 1870 if (atomic_read(&qp_info->snoop_count)) 1871 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS); 1872 1873 /* Validate MAD */ 1874 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num)) 1875 goto out; 1876 1877 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL); 1878 if (!response) { 1879 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory " 1880 "for response buffer\n"); 1881 goto out; 1882 } 1883 1884 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) 1885 port_num = wc->port_num; 1886 else 1887 port_num = port_priv->port_num; 1888 1889 if (recv->mad.mad.mad_hdr.mgmt_class == 1890 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 1891 enum smi_forward_action retsmi; 1892 1893 if (smi_handle_dr_smp_recv(&recv->mad.smp, 1894 port_priv->device->node_type, 1895 port_num, 1896 port_priv->device->phys_port_cnt) == 1897 IB_SMI_DISCARD) 1898 goto out; 1899 1900 retsmi = smi_check_forward_dr_smp(&recv->mad.smp); 1901 if (retsmi == IB_SMI_LOCAL) 1902 goto local; 1903 1904 if (retsmi == IB_SMI_SEND) { /* don't forward */ 1905 if (smi_handle_dr_smp_send(&recv->mad.smp, 1906 port_priv->device->node_type, 1907 port_num) == IB_SMI_DISCARD) 1908 goto out; 1909 1910 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD) 1911 goto out; 1912 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) { 1913 /* forward case for switches */ 1914 memcpy(response, recv, sizeof(*response)); 1915 response->header.recv_wc.wc = &response->header.wc; 1916 response->header.recv_wc.recv_buf.mad = &response->mad.mad; 1917 response->header.recv_wc.recv_buf.grh = &response->grh; 1918 1919 agent_send_response(&response->mad.mad, 1920 &response->grh, wc, 1921 port_priv->device, 1922 smi_get_fwd_port(&recv->mad.smp), 1923 qp_info->qp->qp_num); 1924 1925 goto out; 1926 } 1927 } 1928 1929 local: 1930 /* Give driver "right of first refusal" on incoming MAD */ 1931 if (port_priv->device->process_mad) { 1932 int ret; 1933 1934 if (!response) { 1935 printk(KERN_ERR PFX "No memory for response MAD\n"); 1936 /* 1937 * Is it better to assume that 1938 * it wouldn't be processed ? 1939 */ 1940 goto out; 1941 } 1942 1943 ret = port_priv->device->process_mad(port_priv->device, 0, 1944 port_priv->port_num, 1945 wc, &recv->grh, 1946 &recv->mad.mad, 1947 &response->mad.mad); 1948 if (ret & IB_MAD_RESULT_SUCCESS) { 1949 if (ret & IB_MAD_RESULT_CONSUMED) 1950 goto out; 1951 if (ret & IB_MAD_RESULT_REPLY) { 1952 agent_send_response(&response->mad.mad, 1953 &recv->grh, wc, 1954 port_priv->device, 1955 port_num, 1956 qp_info->qp->qp_num); 1957 goto out; 1958 } 1959 } 1960 } 1961 1962 mad_agent = find_mad_agent(port_priv, &recv->mad.mad); 1963 if (mad_agent) { 1964 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc); 1965 /* 1966 * recv is freed up in error cases in ib_mad_complete_recv 1967 * or via recv_handler in ib_mad_complete_recv() 1968 */ 1969 recv = NULL; 1970 } 1971 1972 out: 1973 /* Post another receive request for this QP */ 1974 if (response) { 1975 ib_mad_post_receive_mads(qp_info, response); 1976 if (recv) 1977 kmem_cache_free(ib_mad_cache, recv); 1978 } else 1979 ib_mad_post_receive_mads(qp_info, recv); 1980 } 1981 1982 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv) 1983 { 1984 struct ib_mad_send_wr_private *mad_send_wr; 1985 unsigned long delay; 1986 1987 if (list_empty(&mad_agent_priv->wait_list)) { 1988 cancel_delayed_work(&mad_agent_priv->timed_work); 1989 } else { 1990 mad_send_wr = list_entry(mad_agent_priv->wait_list.next, 1991 struct ib_mad_send_wr_private, 1992 agent_list); 1993 1994 if (time_after(mad_agent_priv->timeout, 1995 mad_send_wr->timeout)) { 1996 mad_agent_priv->timeout = mad_send_wr->timeout; 1997 cancel_delayed_work(&mad_agent_priv->timed_work); 1998 delay = mad_send_wr->timeout - jiffies; 1999 if ((long)delay <= 0) 2000 delay = 1; 2001 queue_delayed_work(mad_agent_priv->qp_info-> 2002 port_priv->wq, 2003 &mad_agent_priv->timed_work, delay); 2004 } 2005 } 2006 } 2007 2008 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr) 2009 { 2010 struct ib_mad_agent_private *mad_agent_priv; 2011 struct ib_mad_send_wr_private *temp_mad_send_wr; 2012 struct list_head *list_item; 2013 unsigned long delay; 2014 2015 mad_agent_priv = mad_send_wr->mad_agent_priv; 2016 list_del(&mad_send_wr->agent_list); 2017 2018 delay = mad_send_wr->timeout; 2019 mad_send_wr->timeout += jiffies; 2020 2021 if (delay) { 2022 list_for_each_prev(list_item, &mad_agent_priv->wait_list) { 2023 temp_mad_send_wr = list_entry(list_item, 2024 struct ib_mad_send_wr_private, 2025 agent_list); 2026 if (time_after(mad_send_wr->timeout, 2027 temp_mad_send_wr->timeout)) 2028 break; 2029 } 2030 } 2031 else 2032 list_item = &mad_agent_priv->wait_list; 2033 list_add(&mad_send_wr->agent_list, list_item); 2034 2035 /* Reschedule a work item if we have a shorter timeout */ 2036 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) { 2037 cancel_delayed_work(&mad_agent_priv->timed_work); 2038 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq, 2039 &mad_agent_priv->timed_work, delay); 2040 } 2041 } 2042 2043 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr, 2044 int timeout_ms) 2045 { 2046 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2047 wait_for_response(mad_send_wr); 2048 } 2049 2050 /* 2051 * Process a send work completion 2052 */ 2053 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr, 2054 struct ib_mad_send_wc *mad_send_wc) 2055 { 2056 struct ib_mad_agent_private *mad_agent_priv; 2057 unsigned long flags; 2058 int ret; 2059 2060 mad_agent_priv = mad_send_wr->mad_agent_priv; 2061 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2062 if (mad_agent_priv->agent.rmpp_version) { 2063 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc); 2064 if (ret == IB_RMPP_RESULT_CONSUMED) 2065 goto done; 2066 } else 2067 ret = IB_RMPP_RESULT_UNHANDLED; 2068 2069 if (mad_send_wc->status != IB_WC_SUCCESS && 2070 mad_send_wr->status == IB_WC_SUCCESS) { 2071 mad_send_wr->status = mad_send_wc->status; 2072 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2073 } 2074 2075 if (--mad_send_wr->refcount > 0) { 2076 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout && 2077 mad_send_wr->status == IB_WC_SUCCESS) { 2078 wait_for_response(mad_send_wr); 2079 } 2080 goto done; 2081 } 2082 2083 /* Remove send from MAD agent and notify client of completion */ 2084 list_del(&mad_send_wr->agent_list); 2085 adjust_timeout(mad_agent_priv); 2086 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2087 2088 if (mad_send_wr->status != IB_WC_SUCCESS ) 2089 mad_send_wc->status = mad_send_wr->status; 2090 if (ret == IB_RMPP_RESULT_INTERNAL) 2091 ib_rmpp_send_handler(mad_send_wc); 2092 else 2093 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2094 mad_send_wc); 2095 2096 /* Release reference on agent taken when sending */ 2097 deref_mad_agent(mad_agent_priv); 2098 return; 2099 done: 2100 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2101 } 2102 2103 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv, 2104 struct ib_wc *wc) 2105 { 2106 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr; 2107 struct ib_mad_list_head *mad_list; 2108 struct ib_mad_qp_info *qp_info; 2109 struct ib_mad_queue *send_queue; 2110 struct ib_send_wr *bad_send_wr; 2111 struct ib_mad_send_wc mad_send_wc; 2112 unsigned long flags; 2113 int ret; 2114 2115 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 2116 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2117 mad_list); 2118 send_queue = mad_list->mad_queue; 2119 qp_info = send_queue->qp_info; 2120 2121 retry: 2122 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2123 mad_send_wr->header_mapping, 2124 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE); 2125 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2126 mad_send_wr->payload_mapping, 2127 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE); 2128 queued_send_wr = NULL; 2129 spin_lock_irqsave(&send_queue->lock, flags); 2130 list_del(&mad_list->list); 2131 2132 /* Move queued send to the send queue */ 2133 if (send_queue->count-- > send_queue->max_active) { 2134 mad_list = container_of(qp_info->overflow_list.next, 2135 struct ib_mad_list_head, list); 2136 queued_send_wr = container_of(mad_list, 2137 struct ib_mad_send_wr_private, 2138 mad_list); 2139 list_move_tail(&mad_list->list, &send_queue->list); 2140 } 2141 spin_unlock_irqrestore(&send_queue->lock, flags); 2142 2143 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2144 mad_send_wc.status = wc->status; 2145 mad_send_wc.vendor_err = wc->vendor_err; 2146 if (atomic_read(&qp_info->snoop_count)) 2147 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc, 2148 IB_MAD_SNOOP_SEND_COMPLETIONS); 2149 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 2150 2151 if (queued_send_wr) { 2152 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr, 2153 &bad_send_wr); 2154 if (ret) { 2155 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret); 2156 mad_send_wr = queued_send_wr; 2157 wc->status = IB_WC_LOC_QP_OP_ERR; 2158 goto retry; 2159 } 2160 } 2161 } 2162 2163 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info) 2164 { 2165 struct ib_mad_send_wr_private *mad_send_wr; 2166 struct ib_mad_list_head *mad_list; 2167 unsigned long flags; 2168 2169 spin_lock_irqsave(&qp_info->send_queue.lock, flags); 2170 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) { 2171 mad_send_wr = container_of(mad_list, 2172 struct ib_mad_send_wr_private, 2173 mad_list); 2174 mad_send_wr->retry = 1; 2175 } 2176 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); 2177 } 2178 2179 static void mad_error_handler(struct ib_mad_port_private *port_priv, 2180 struct ib_wc *wc) 2181 { 2182 struct ib_mad_list_head *mad_list; 2183 struct ib_mad_qp_info *qp_info; 2184 struct ib_mad_send_wr_private *mad_send_wr; 2185 int ret; 2186 2187 /* Determine if failure was a send or receive */ 2188 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 2189 qp_info = mad_list->mad_queue->qp_info; 2190 if (mad_list->mad_queue == &qp_info->recv_queue) 2191 /* 2192 * Receive errors indicate that the QP has entered the error 2193 * state - error handling/shutdown code will cleanup 2194 */ 2195 return; 2196 2197 /* 2198 * Send errors will transition the QP to SQE - move 2199 * QP to RTS and repost flushed work requests 2200 */ 2201 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2202 mad_list); 2203 if (wc->status == IB_WC_WR_FLUSH_ERR) { 2204 if (mad_send_wr->retry) { 2205 /* Repost send */ 2206 struct ib_send_wr *bad_send_wr; 2207 2208 mad_send_wr->retry = 0; 2209 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr, 2210 &bad_send_wr); 2211 if (ret) 2212 ib_mad_send_done_handler(port_priv, wc); 2213 } else 2214 ib_mad_send_done_handler(port_priv, wc); 2215 } else { 2216 struct ib_qp_attr *attr; 2217 2218 /* Transition QP to RTS and fail offending send */ 2219 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2220 if (attr) { 2221 attr->qp_state = IB_QPS_RTS; 2222 attr->cur_qp_state = IB_QPS_SQE; 2223 ret = ib_modify_qp(qp_info->qp, attr, 2224 IB_QP_STATE | IB_QP_CUR_STATE); 2225 kfree(attr); 2226 if (ret) 2227 printk(KERN_ERR PFX "mad_error_handler - " 2228 "ib_modify_qp to RTS : %d\n", ret); 2229 else 2230 mark_sends_for_retry(qp_info); 2231 } 2232 ib_mad_send_done_handler(port_priv, wc); 2233 } 2234 } 2235 2236 /* 2237 * IB MAD completion callback 2238 */ 2239 static void ib_mad_completion_handler(struct work_struct *work) 2240 { 2241 struct ib_mad_port_private *port_priv; 2242 struct ib_wc wc; 2243 2244 port_priv = container_of(work, struct ib_mad_port_private, work); 2245 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); 2246 2247 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) { 2248 if (wc.status == IB_WC_SUCCESS) { 2249 switch (wc.opcode) { 2250 case IB_WC_SEND: 2251 ib_mad_send_done_handler(port_priv, &wc); 2252 break; 2253 case IB_WC_RECV: 2254 ib_mad_recv_done_handler(port_priv, &wc); 2255 break; 2256 default: 2257 BUG_ON(1); 2258 break; 2259 } 2260 } else 2261 mad_error_handler(port_priv, &wc); 2262 } 2263 } 2264 2265 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv) 2266 { 2267 unsigned long flags; 2268 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr; 2269 struct ib_mad_send_wc mad_send_wc; 2270 struct list_head cancel_list; 2271 2272 INIT_LIST_HEAD(&cancel_list); 2273 2274 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2275 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2276 &mad_agent_priv->send_list, agent_list) { 2277 if (mad_send_wr->status == IB_WC_SUCCESS) { 2278 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2279 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2280 } 2281 } 2282 2283 /* Empty wait list to prevent receives from finding a request */ 2284 list_splice_init(&mad_agent_priv->wait_list, &cancel_list); 2285 /* Empty local completion list as well */ 2286 list_splice_init(&mad_agent_priv->local_list, &cancel_list); 2287 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2288 2289 /* Report all cancelled requests */ 2290 mad_send_wc.status = IB_WC_WR_FLUSH_ERR; 2291 mad_send_wc.vendor_err = 0; 2292 2293 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2294 &cancel_list, agent_list) { 2295 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2296 list_del(&mad_send_wr->agent_list); 2297 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2298 &mad_send_wc); 2299 atomic_dec(&mad_agent_priv->refcount); 2300 } 2301 } 2302 2303 static struct ib_mad_send_wr_private* 2304 find_send_wr(struct ib_mad_agent_private *mad_agent_priv, 2305 struct ib_mad_send_buf *send_buf) 2306 { 2307 struct ib_mad_send_wr_private *mad_send_wr; 2308 2309 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list, 2310 agent_list) { 2311 if (&mad_send_wr->send_buf == send_buf) 2312 return mad_send_wr; 2313 } 2314 2315 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list, 2316 agent_list) { 2317 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) && 2318 &mad_send_wr->send_buf == send_buf) 2319 return mad_send_wr; 2320 } 2321 return NULL; 2322 } 2323 2324 int ib_modify_mad(struct ib_mad_agent *mad_agent, 2325 struct ib_mad_send_buf *send_buf, u32 timeout_ms) 2326 { 2327 struct ib_mad_agent_private *mad_agent_priv; 2328 struct ib_mad_send_wr_private *mad_send_wr; 2329 unsigned long flags; 2330 int active; 2331 2332 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, 2333 agent); 2334 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2335 mad_send_wr = find_send_wr(mad_agent_priv, send_buf); 2336 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) { 2337 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2338 return -EINVAL; 2339 } 2340 2341 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1); 2342 if (!timeout_ms) { 2343 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2344 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2345 } 2346 2347 mad_send_wr->send_buf.timeout_ms = timeout_ms; 2348 if (active) 2349 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2350 else 2351 ib_reset_mad_timeout(mad_send_wr, timeout_ms); 2352 2353 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2354 return 0; 2355 } 2356 EXPORT_SYMBOL(ib_modify_mad); 2357 2358 void ib_cancel_mad(struct ib_mad_agent *mad_agent, 2359 struct ib_mad_send_buf *send_buf) 2360 { 2361 ib_modify_mad(mad_agent, send_buf, 0); 2362 } 2363 EXPORT_SYMBOL(ib_cancel_mad); 2364 2365 static void local_completions(struct work_struct *work) 2366 { 2367 struct ib_mad_agent_private *mad_agent_priv; 2368 struct ib_mad_local_private *local; 2369 struct ib_mad_agent_private *recv_mad_agent; 2370 unsigned long flags; 2371 int recv = 0; 2372 struct ib_wc wc; 2373 struct ib_mad_send_wc mad_send_wc; 2374 2375 mad_agent_priv = 2376 container_of(work, struct ib_mad_agent_private, local_work); 2377 2378 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2379 while (!list_empty(&mad_agent_priv->local_list)) { 2380 local = list_entry(mad_agent_priv->local_list.next, 2381 struct ib_mad_local_private, 2382 completion_list); 2383 list_del(&local->completion_list); 2384 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2385 if (local->mad_priv) { 2386 recv_mad_agent = local->recv_mad_agent; 2387 if (!recv_mad_agent) { 2388 printk(KERN_ERR PFX "No receive MAD agent for local completion\n"); 2389 goto local_send_completion; 2390 } 2391 2392 recv = 1; 2393 /* 2394 * Defined behavior is to complete response 2395 * before request 2396 */ 2397 build_smp_wc(recv_mad_agent->agent.qp, 2398 (unsigned long) local->mad_send_wr, 2399 be16_to_cpu(IB_LID_PERMISSIVE), 2400 0, recv_mad_agent->agent.port_num, &wc); 2401 2402 local->mad_priv->header.recv_wc.wc = &wc; 2403 local->mad_priv->header.recv_wc.mad_len = 2404 sizeof(struct ib_mad); 2405 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list); 2406 list_add(&local->mad_priv->header.recv_wc.recv_buf.list, 2407 &local->mad_priv->header.recv_wc.rmpp_list); 2408 local->mad_priv->header.recv_wc.recv_buf.grh = NULL; 2409 local->mad_priv->header.recv_wc.recv_buf.mad = 2410 &local->mad_priv->mad.mad; 2411 if (atomic_read(&recv_mad_agent->qp_info->snoop_count)) 2412 snoop_recv(recv_mad_agent->qp_info, 2413 &local->mad_priv->header.recv_wc, 2414 IB_MAD_SNOOP_RECVS); 2415 recv_mad_agent->agent.recv_handler( 2416 &recv_mad_agent->agent, 2417 &local->mad_priv->header.recv_wc); 2418 spin_lock_irqsave(&recv_mad_agent->lock, flags); 2419 atomic_dec(&recv_mad_agent->refcount); 2420 spin_unlock_irqrestore(&recv_mad_agent->lock, flags); 2421 } 2422 2423 local_send_completion: 2424 /* Complete send */ 2425 mad_send_wc.status = IB_WC_SUCCESS; 2426 mad_send_wc.vendor_err = 0; 2427 mad_send_wc.send_buf = &local->mad_send_wr->send_buf; 2428 if (atomic_read(&mad_agent_priv->qp_info->snoop_count)) 2429 snoop_send(mad_agent_priv->qp_info, 2430 &local->mad_send_wr->send_buf, 2431 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS); 2432 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2433 &mad_send_wc); 2434 2435 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2436 atomic_dec(&mad_agent_priv->refcount); 2437 if (!recv) 2438 kmem_cache_free(ib_mad_cache, local->mad_priv); 2439 kfree(local); 2440 } 2441 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2442 } 2443 2444 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr) 2445 { 2446 int ret; 2447 2448 if (!mad_send_wr->retries--) 2449 return -ETIMEDOUT; 2450 2451 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms); 2452 2453 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) { 2454 ret = ib_retry_rmpp(mad_send_wr); 2455 switch (ret) { 2456 case IB_RMPP_RESULT_UNHANDLED: 2457 ret = ib_send_mad(mad_send_wr); 2458 break; 2459 case IB_RMPP_RESULT_CONSUMED: 2460 ret = 0; 2461 break; 2462 default: 2463 ret = -ECOMM; 2464 break; 2465 } 2466 } else 2467 ret = ib_send_mad(mad_send_wr); 2468 2469 if (!ret) { 2470 mad_send_wr->refcount++; 2471 list_add_tail(&mad_send_wr->agent_list, 2472 &mad_send_wr->mad_agent_priv->send_list); 2473 } 2474 return ret; 2475 } 2476 2477 static void timeout_sends(struct work_struct *work) 2478 { 2479 struct ib_mad_agent_private *mad_agent_priv; 2480 struct ib_mad_send_wr_private *mad_send_wr; 2481 struct ib_mad_send_wc mad_send_wc; 2482 unsigned long flags, delay; 2483 2484 mad_agent_priv = container_of(work, struct ib_mad_agent_private, 2485 timed_work.work); 2486 mad_send_wc.vendor_err = 0; 2487 2488 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2489 while (!list_empty(&mad_agent_priv->wait_list)) { 2490 mad_send_wr = list_entry(mad_agent_priv->wait_list.next, 2491 struct ib_mad_send_wr_private, 2492 agent_list); 2493 2494 if (time_after(mad_send_wr->timeout, jiffies)) { 2495 delay = mad_send_wr->timeout - jiffies; 2496 if ((long)delay <= 0) 2497 delay = 1; 2498 queue_delayed_work(mad_agent_priv->qp_info-> 2499 port_priv->wq, 2500 &mad_agent_priv->timed_work, delay); 2501 break; 2502 } 2503 2504 list_del(&mad_send_wr->agent_list); 2505 if (mad_send_wr->status == IB_WC_SUCCESS && 2506 !retry_send(mad_send_wr)) 2507 continue; 2508 2509 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2510 2511 if (mad_send_wr->status == IB_WC_SUCCESS) 2512 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR; 2513 else 2514 mad_send_wc.status = mad_send_wr->status; 2515 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2516 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2517 &mad_send_wc); 2518 2519 atomic_dec(&mad_agent_priv->refcount); 2520 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2521 } 2522 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2523 } 2524 2525 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg) 2526 { 2527 struct ib_mad_port_private *port_priv = cq->cq_context; 2528 unsigned long flags; 2529 2530 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2531 if (!list_empty(&port_priv->port_list)) 2532 queue_work(port_priv->wq, &port_priv->work); 2533 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2534 } 2535 2536 /* 2537 * Allocate receive MADs and post receive WRs for them 2538 */ 2539 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info, 2540 struct ib_mad_private *mad) 2541 { 2542 unsigned long flags; 2543 int post, ret; 2544 struct ib_mad_private *mad_priv; 2545 struct ib_sge sg_list; 2546 struct ib_recv_wr recv_wr, *bad_recv_wr; 2547 struct ib_mad_queue *recv_queue = &qp_info->recv_queue; 2548 2549 /* Initialize common scatter list fields */ 2550 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header; 2551 sg_list.lkey = (*qp_info->port_priv->mr).lkey; 2552 2553 /* Initialize common receive WR fields */ 2554 recv_wr.next = NULL; 2555 recv_wr.sg_list = &sg_list; 2556 recv_wr.num_sge = 1; 2557 2558 do { 2559 /* Allocate and map receive buffer */ 2560 if (mad) { 2561 mad_priv = mad; 2562 mad = NULL; 2563 } else { 2564 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL); 2565 if (!mad_priv) { 2566 printk(KERN_ERR PFX "No memory for receive buffer\n"); 2567 ret = -ENOMEM; 2568 break; 2569 } 2570 } 2571 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device, 2572 &mad_priv->grh, 2573 sizeof *mad_priv - 2574 sizeof mad_priv->header, 2575 DMA_FROM_DEVICE); 2576 mad_priv->header.mapping = sg_list.addr; 2577 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list; 2578 mad_priv->header.mad_list.mad_queue = recv_queue; 2579 2580 /* Post receive WR */ 2581 spin_lock_irqsave(&recv_queue->lock, flags); 2582 post = (++recv_queue->count < recv_queue->max_active); 2583 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list); 2584 spin_unlock_irqrestore(&recv_queue->lock, flags); 2585 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr); 2586 if (ret) { 2587 spin_lock_irqsave(&recv_queue->lock, flags); 2588 list_del(&mad_priv->header.mad_list.list); 2589 recv_queue->count--; 2590 spin_unlock_irqrestore(&recv_queue->lock, flags); 2591 ib_dma_unmap_single(qp_info->port_priv->device, 2592 mad_priv->header.mapping, 2593 sizeof *mad_priv - 2594 sizeof mad_priv->header, 2595 DMA_FROM_DEVICE); 2596 kmem_cache_free(ib_mad_cache, mad_priv); 2597 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret); 2598 break; 2599 } 2600 } while (post); 2601 2602 return ret; 2603 } 2604 2605 /* 2606 * Return all the posted receive MADs 2607 */ 2608 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info) 2609 { 2610 struct ib_mad_private_header *mad_priv_hdr; 2611 struct ib_mad_private *recv; 2612 struct ib_mad_list_head *mad_list; 2613 2614 while (!list_empty(&qp_info->recv_queue.list)) { 2615 2616 mad_list = list_entry(qp_info->recv_queue.list.next, 2617 struct ib_mad_list_head, list); 2618 mad_priv_hdr = container_of(mad_list, 2619 struct ib_mad_private_header, 2620 mad_list); 2621 recv = container_of(mad_priv_hdr, struct ib_mad_private, 2622 header); 2623 2624 /* Remove from posted receive MAD list */ 2625 list_del(&mad_list->list); 2626 2627 ib_dma_unmap_single(qp_info->port_priv->device, 2628 recv->header.mapping, 2629 sizeof(struct ib_mad_private) - 2630 sizeof(struct ib_mad_private_header), 2631 DMA_FROM_DEVICE); 2632 kmem_cache_free(ib_mad_cache, recv); 2633 } 2634 2635 qp_info->recv_queue.count = 0; 2636 } 2637 2638 /* 2639 * Start the port 2640 */ 2641 static int ib_mad_port_start(struct ib_mad_port_private *port_priv) 2642 { 2643 int ret, i; 2644 struct ib_qp_attr *attr; 2645 struct ib_qp *qp; 2646 2647 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2648 if (!attr) { 2649 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n"); 2650 return -ENOMEM; 2651 } 2652 2653 for (i = 0; i < IB_MAD_QPS_CORE; i++) { 2654 qp = port_priv->qp_info[i].qp; 2655 /* 2656 * PKey index for QP1 is irrelevant but 2657 * one is needed for the Reset to Init transition 2658 */ 2659 attr->qp_state = IB_QPS_INIT; 2660 attr->pkey_index = 0; 2661 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY; 2662 ret = ib_modify_qp(qp, attr, IB_QP_STATE | 2663 IB_QP_PKEY_INDEX | IB_QP_QKEY); 2664 if (ret) { 2665 printk(KERN_ERR PFX "Couldn't change QP%d state to " 2666 "INIT: %d\n", i, ret); 2667 goto out; 2668 } 2669 2670 attr->qp_state = IB_QPS_RTR; 2671 ret = ib_modify_qp(qp, attr, IB_QP_STATE); 2672 if (ret) { 2673 printk(KERN_ERR PFX "Couldn't change QP%d state to " 2674 "RTR: %d\n", i, ret); 2675 goto out; 2676 } 2677 2678 attr->qp_state = IB_QPS_RTS; 2679 attr->sq_psn = IB_MAD_SEND_Q_PSN; 2680 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN); 2681 if (ret) { 2682 printk(KERN_ERR PFX "Couldn't change QP%d state to " 2683 "RTS: %d\n", i, ret); 2684 goto out; 2685 } 2686 } 2687 2688 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); 2689 if (ret) { 2690 printk(KERN_ERR PFX "Failed to request completion " 2691 "notification: %d\n", ret); 2692 goto out; 2693 } 2694 2695 for (i = 0; i < IB_MAD_QPS_CORE; i++) { 2696 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL); 2697 if (ret) { 2698 printk(KERN_ERR PFX "Couldn't post receive WRs\n"); 2699 goto out; 2700 } 2701 } 2702 out: 2703 kfree(attr); 2704 return ret; 2705 } 2706 2707 static void qp_event_handler(struct ib_event *event, void *qp_context) 2708 { 2709 struct ib_mad_qp_info *qp_info = qp_context; 2710 2711 /* It's worse than that! He's dead, Jim! */ 2712 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n", 2713 event->event, qp_info->qp->qp_num); 2714 } 2715 2716 static void init_mad_queue(struct ib_mad_qp_info *qp_info, 2717 struct ib_mad_queue *mad_queue) 2718 { 2719 mad_queue->qp_info = qp_info; 2720 mad_queue->count = 0; 2721 spin_lock_init(&mad_queue->lock); 2722 INIT_LIST_HEAD(&mad_queue->list); 2723 } 2724 2725 static void init_mad_qp(struct ib_mad_port_private *port_priv, 2726 struct ib_mad_qp_info *qp_info) 2727 { 2728 qp_info->port_priv = port_priv; 2729 init_mad_queue(qp_info, &qp_info->send_queue); 2730 init_mad_queue(qp_info, &qp_info->recv_queue); 2731 INIT_LIST_HEAD(&qp_info->overflow_list); 2732 spin_lock_init(&qp_info->snoop_lock); 2733 qp_info->snoop_table = NULL; 2734 qp_info->snoop_table_size = 0; 2735 atomic_set(&qp_info->snoop_count, 0); 2736 } 2737 2738 static int create_mad_qp(struct ib_mad_qp_info *qp_info, 2739 enum ib_qp_type qp_type) 2740 { 2741 struct ib_qp_init_attr qp_init_attr; 2742 int ret; 2743 2744 memset(&qp_init_attr, 0, sizeof qp_init_attr); 2745 qp_init_attr.send_cq = qp_info->port_priv->cq; 2746 qp_init_attr.recv_cq = qp_info->port_priv->cq; 2747 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR; 2748 qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE; 2749 qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE; 2750 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG; 2751 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG; 2752 qp_init_attr.qp_type = qp_type; 2753 qp_init_attr.port_num = qp_info->port_priv->port_num; 2754 qp_init_attr.qp_context = qp_info; 2755 qp_init_attr.event_handler = qp_event_handler; 2756 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr); 2757 if (IS_ERR(qp_info->qp)) { 2758 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n", 2759 get_spl_qp_index(qp_type)); 2760 ret = PTR_ERR(qp_info->qp); 2761 goto error; 2762 } 2763 /* Use minimum queue sizes unless the CQ is resized */ 2764 qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE; 2765 qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE; 2766 return 0; 2767 2768 error: 2769 return ret; 2770 } 2771 2772 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info) 2773 { 2774 ib_destroy_qp(qp_info->qp); 2775 kfree(qp_info->snoop_table); 2776 } 2777 2778 /* 2779 * Open the port 2780 * Create the QP, PD, MR, and CQ if needed 2781 */ 2782 static int ib_mad_port_open(struct ib_device *device, 2783 int port_num) 2784 { 2785 int ret, cq_size; 2786 struct ib_mad_port_private *port_priv; 2787 unsigned long flags; 2788 char name[sizeof "ib_mad123"]; 2789 2790 /* Create new device info */ 2791 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL); 2792 if (!port_priv) { 2793 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n"); 2794 return -ENOMEM; 2795 } 2796 2797 port_priv->device = device; 2798 port_priv->port_num = port_num; 2799 spin_lock_init(&port_priv->reg_lock); 2800 INIT_LIST_HEAD(&port_priv->agent_list); 2801 init_mad_qp(port_priv, &port_priv->qp_info[0]); 2802 init_mad_qp(port_priv, &port_priv->qp_info[1]); 2803 2804 cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2; 2805 port_priv->cq = ib_create_cq(port_priv->device, 2806 ib_mad_thread_completion_handler, 2807 NULL, port_priv, cq_size, 0); 2808 if (IS_ERR(port_priv->cq)) { 2809 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n"); 2810 ret = PTR_ERR(port_priv->cq); 2811 goto error3; 2812 } 2813 2814 port_priv->pd = ib_alloc_pd(device); 2815 if (IS_ERR(port_priv->pd)) { 2816 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n"); 2817 ret = PTR_ERR(port_priv->pd); 2818 goto error4; 2819 } 2820 2821 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE); 2822 if (IS_ERR(port_priv->mr)) { 2823 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n"); 2824 ret = PTR_ERR(port_priv->mr); 2825 goto error5; 2826 } 2827 2828 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI); 2829 if (ret) 2830 goto error6; 2831 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI); 2832 if (ret) 2833 goto error7; 2834 2835 snprintf(name, sizeof name, "ib_mad%d", port_num); 2836 port_priv->wq = create_singlethread_workqueue(name); 2837 if (!port_priv->wq) { 2838 ret = -ENOMEM; 2839 goto error8; 2840 } 2841 INIT_WORK(&port_priv->work, ib_mad_completion_handler); 2842 2843 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2844 list_add_tail(&port_priv->port_list, &ib_mad_port_list); 2845 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2846 2847 ret = ib_mad_port_start(port_priv); 2848 if (ret) { 2849 printk(KERN_ERR PFX "Couldn't start port\n"); 2850 goto error9; 2851 } 2852 2853 return 0; 2854 2855 error9: 2856 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2857 list_del_init(&port_priv->port_list); 2858 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2859 2860 destroy_workqueue(port_priv->wq); 2861 error8: 2862 destroy_mad_qp(&port_priv->qp_info[1]); 2863 error7: 2864 destroy_mad_qp(&port_priv->qp_info[0]); 2865 error6: 2866 ib_dereg_mr(port_priv->mr); 2867 error5: 2868 ib_dealloc_pd(port_priv->pd); 2869 error4: 2870 ib_destroy_cq(port_priv->cq); 2871 cleanup_recv_queue(&port_priv->qp_info[1]); 2872 cleanup_recv_queue(&port_priv->qp_info[0]); 2873 error3: 2874 kfree(port_priv); 2875 2876 return ret; 2877 } 2878 2879 /* 2880 * Close the port 2881 * If there are no classes using the port, free the port 2882 * resources (CQ, MR, PD, QP) and remove the port's info structure 2883 */ 2884 static int ib_mad_port_close(struct ib_device *device, int port_num) 2885 { 2886 struct ib_mad_port_private *port_priv; 2887 unsigned long flags; 2888 2889 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2890 port_priv = __ib_get_mad_port(device, port_num); 2891 if (port_priv == NULL) { 2892 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2893 printk(KERN_ERR PFX "Port %d not found\n", port_num); 2894 return -ENODEV; 2895 } 2896 list_del_init(&port_priv->port_list); 2897 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2898 2899 destroy_workqueue(port_priv->wq); 2900 destroy_mad_qp(&port_priv->qp_info[1]); 2901 destroy_mad_qp(&port_priv->qp_info[0]); 2902 ib_dereg_mr(port_priv->mr); 2903 ib_dealloc_pd(port_priv->pd); 2904 ib_destroy_cq(port_priv->cq); 2905 cleanup_recv_queue(&port_priv->qp_info[1]); 2906 cleanup_recv_queue(&port_priv->qp_info[0]); 2907 /* XXX: Handle deallocation of MAD registration tables */ 2908 2909 kfree(port_priv); 2910 2911 return 0; 2912 } 2913 2914 static void ib_mad_init_device(struct ib_device *device) 2915 { 2916 int start, end, i; 2917 2918 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 2919 return; 2920 2921 if (device->node_type == RDMA_NODE_IB_SWITCH) { 2922 start = 0; 2923 end = 0; 2924 } else { 2925 start = 1; 2926 end = device->phys_port_cnt; 2927 } 2928 2929 for (i = start; i <= end; i++) { 2930 if (ib_mad_port_open(device, i)) { 2931 printk(KERN_ERR PFX "Couldn't open %s port %d\n", 2932 device->name, i); 2933 goto error; 2934 } 2935 if (ib_agent_port_open(device, i)) { 2936 printk(KERN_ERR PFX "Couldn't open %s port %d " 2937 "for agents\n", 2938 device->name, i); 2939 goto error_agent; 2940 } 2941 } 2942 return; 2943 2944 error_agent: 2945 if (ib_mad_port_close(device, i)) 2946 printk(KERN_ERR PFX "Couldn't close %s port %d\n", 2947 device->name, i); 2948 2949 error: 2950 i--; 2951 2952 while (i >= start) { 2953 if (ib_agent_port_close(device, i)) 2954 printk(KERN_ERR PFX "Couldn't close %s port %d " 2955 "for agents\n", 2956 device->name, i); 2957 if (ib_mad_port_close(device, i)) 2958 printk(KERN_ERR PFX "Couldn't close %s port %d\n", 2959 device->name, i); 2960 i--; 2961 } 2962 } 2963 2964 static void ib_mad_remove_device(struct ib_device *device) 2965 { 2966 int i, num_ports, cur_port; 2967 2968 if (device->node_type == RDMA_NODE_IB_SWITCH) { 2969 num_ports = 1; 2970 cur_port = 0; 2971 } else { 2972 num_ports = device->phys_port_cnt; 2973 cur_port = 1; 2974 } 2975 for (i = 0; i < num_ports; i++, cur_port++) { 2976 if (ib_agent_port_close(device, cur_port)) 2977 printk(KERN_ERR PFX "Couldn't close %s port %d " 2978 "for agents\n", 2979 device->name, cur_port); 2980 if (ib_mad_port_close(device, cur_port)) 2981 printk(KERN_ERR PFX "Couldn't close %s port %d\n", 2982 device->name, cur_port); 2983 } 2984 } 2985 2986 static struct ib_client mad_client = { 2987 .name = "mad", 2988 .add = ib_mad_init_device, 2989 .remove = ib_mad_remove_device 2990 }; 2991 2992 static int __init ib_mad_init_module(void) 2993 { 2994 int ret; 2995 2996 spin_lock_init(&ib_mad_port_list_lock); 2997 2998 ib_mad_cache = kmem_cache_create("ib_mad", 2999 sizeof(struct ib_mad_private), 3000 0, 3001 SLAB_HWCACHE_ALIGN, 3002 NULL); 3003 if (!ib_mad_cache) { 3004 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n"); 3005 ret = -ENOMEM; 3006 goto error1; 3007 } 3008 3009 INIT_LIST_HEAD(&ib_mad_port_list); 3010 3011 if (ib_register_client(&mad_client)) { 3012 printk(KERN_ERR PFX "Couldn't register ib_mad client\n"); 3013 ret = -EINVAL; 3014 goto error2; 3015 } 3016 3017 return 0; 3018 3019 error2: 3020 kmem_cache_destroy(ib_mad_cache); 3021 error1: 3022 return ret; 3023 } 3024 3025 static void __exit ib_mad_cleanup_module(void) 3026 { 3027 ib_unregister_client(&mad_client); 3028 kmem_cache_destroy(ib_mad_cache); 3029 } 3030 3031 module_init(ib_mad_init_module); 3032 module_exit(ib_mad_cleanup_module); 3033 3034