1 /* 2 * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved. 3 * Copyright (c) 2005 Intel Corporation. All rights reserved. 4 * Copyright (c) 2005 Mellanox Technologies Ltd. All rights reserved. 5 * 6 * This software is available to you under a choice of one of two 7 * licenses. You may choose to be licensed under the terms of the GNU 8 * General Public License (GPL) Version 2, available from the file 9 * COPYING in the main directory of this source tree, or the 10 * OpenIB.org BSD license below: 11 * 12 * Redistribution and use in source and binary forms, with or 13 * without modification, are permitted provided that the following 14 * conditions are met: 15 * 16 * - Redistributions of source code must retain the above 17 * copyright notice, this list of conditions and the following 18 * disclaimer. 19 * 20 * - Redistributions in binary form must reproduce the above 21 * copyright notice, this list of conditions and the following 22 * disclaimer in the documentation and/or other materials 23 * provided with the distribution. 24 * 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 32 * SOFTWARE. 33 * 34 */ 35 #include <linux/dma-mapping.h> 36 #include <rdma/ib_cache.h> 37 38 #include "mad_priv.h" 39 #include "mad_rmpp.h" 40 #include "smi.h" 41 #include "agent.h" 42 43 MODULE_LICENSE("Dual BSD/GPL"); 44 MODULE_DESCRIPTION("kernel IB MAD API"); 45 MODULE_AUTHOR("Hal Rosenstock"); 46 MODULE_AUTHOR("Sean Hefty"); 47 48 static struct kmem_cache *ib_mad_cache; 49 50 static struct list_head ib_mad_port_list; 51 static u32 ib_mad_client_id = 0; 52 53 /* Port list lock */ 54 static spinlock_t ib_mad_port_list_lock; 55 56 57 /* Forward declarations */ 58 static int method_in_use(struct ib_mad_mgmt_method_table **method, 59 struct ib_mad_reg_req *mad_reg_req); 60 static void remove_mad_reg_req(struct ib_mad_agent_private *priv); 61 static struct ib_mad_agent_private *find_mad_agent( 62 struct ib_mad_port_private *port_priv, 63 struct ib_mad *mad); 64 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info, 65 struct ib_mad_private *mad); 66 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv); 67 static void timeout_sends(struct work_struct *work); 68 static void local_completions(struct work_struct *work); 69 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req, 70 struct ib_mad_agent_private *agent_priv, 71 u8 mgmt_class); 72 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req, 73 struct ib_mad_agent_private *agent_priv); 74 75 /* 76 * Returns a ib_mad_port_private structure or NULL for a device/port 77 * Assumes ib_mad_port_list_lock is being held 78 */ 79 static inline struct ib_mad_port_private * 80 __ib_get_mad_port(struct ib_device *device, int port_num) 81 { 82 struct ib_mad_port_private *entry; 83 84 list_for_each_entry(entry, &ib_mad_port_list, port_list) { 85 if (entry->device == device && entry->port_num == port_num) 86 return entry; 87 } 88 return NULL; 89 } 90 91 /* 92 * Wrapper function to return a ib_mad_port_private structure or NULL 93 * for a device/port 94 */ 95 static inline struct ib_mad_port_private * 96 ib_get_mad_port(struct ib_device *device, int port_num) 97 { 98 struct ib_mad_port_private *entry; 99 unsigned long flags; 100 101 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 102 entry = __ib_get_mad_port(device, port_num); 103 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 104 105 return entry; 106 } 107 108 static inline u8 convert_mgmt_class(u8 mgmt_class) 109 { 110 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */ 111 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ? 112 0 : mgmt_class; 113 } 114 115 static int get_spl_qp_index(enum ib_qp_type qp_type) 116 { 117 switch (qp_type) 118 { 119 case IB_QPT_SMI: 120 return 0; 121 case IB_QPT_GSI: 122 return 1; 123 default: 124 return -1; 125 } 126 } 127 128 static int vendor_class_index(u8 mgmt_class) 129 { 130 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START; 131 } 132 133 static int is_vendor_class(u8 mgmt_class) 134 { 135 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) || 136 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END)) 137 return 0; 138 return 1; 139 } 140 141 static int is_vendor_oui(char *oui) 142 { 143 if (oui[0] || oui[1] || oui[2]) 144 return 1; 145 return 0; 146 } 147 148 static int is_vendor_method_in_use( 149 struct ib_mad_mgmt_vendor_class *vendor_class, 150 struct ib_mad_reg_req *mad_reg_req) 151 { 152 struct ib_mad_mgmt_method_table *method; 153 int i; 154 155 for (i = 0; i < MAX_MGMT_OUI; i++) { 156 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) { 157 method = vendor_class->method_table[i]; 158 if (method) { 159 if (method_in_use(&method, mad_reg_req)) 160 return 1; 161 else 162 break; 163 } 164 } 165 } 166 return 0; 167 } 168 169 int ib_response_mad(struct ib_mad *mad) 170 { 171 return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) || 172 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) || 173 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) && 174 (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP))); 175 } 176 EXPORT_SYMBOL(ib_response_mad); 177 178 /* 179 * ib_register_mad_agent - Register to send/receive MADs 180 */ 181 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device, 182 u8 port_num, 183 enum ib_qp_type qp_type, 184 struct ib_mad_reg_req *mad_reg_req, 185 u8 rmpp_version, 186 ib_mad_send_handler send_handler, 187 ib_mad_recv_handler recv_handler, 188 void *context) 189 { 190 struct ib_mad_port_private *port_priv; 191 struct ib_mad_agent *ret = ERR_PTR(-EINVAL); 192 struct ib_mad_agent_private *mad_agent_priv; 193 struct ib_mad_reg_req *reg_req = NULL; 194 struct ib_mad_mgmt_class_table *class; 195 struct ib_mad_mgmt_vendor_class_table *vendor; 196 struct ib_mad_mgmt_vendor_class *vendor_class; 197 struct ib_mad_mgmt_method_table *method; 198 int ret2, qpn; 199 unsigned long flags; 200 u8 mgmt_class, vclass; 201 202 /* Validate parameters */ 203 qpn = get_spl_qp_index(qp_type); 204 if (qpn == -1) 205 goto error1; 206 207 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) 208 goto error1; 209 210 /* Validate MAD registration request if supplied */ 211 if (mad_reg_req) { 212 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) 213 goto error1; 214 if (!recv_handler) 215 goto error1; 216 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) { 217 /* 218 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only 219 * one in this range currently allowed 220 */ 221 if (mad_reg_req->mgmt_class != 222 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 223 goto error1; 224 } else if (mad_reg_req->mgmt_class == 0) { 225 /* 226 * Class 0 is reserved in IBA and is used for 227 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE 228 */ 229 goto error1; 230 } else if (is_vendor_class(mad_reg_req->mgmt_class)) { 231 /* 232 * If class is in "new" vendor range, 233 * ensure supplied OUI is not zero 234 */ 235 if (!is_vendor_oui(mad_reg_req->oui)) 236 goto error1; 237 } 238 /* Make sure class supplied is consistent with RMPP */ 239 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) { 240 if (rmpp_version) 241 goto error1; 242 } 243 /* Make sure class supplied is consistent with QP type */ 244 if (qp_type == IB_QPT_SMI) { 245 if ((mad_reg_req->mgmt_class != 246 IB_MGMT_CLASS_SUBN_LID_ROUTED) && 247 (mad_reg_req->mgmt_class != 248 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) 249 goto error1; 250 } else { 251 if ((mad_reg_req->mgmt_class == 252 IB_MGMT_CLASS_SUBN_LID_ROUTED) || 253 (mad_reg_req->mgmt_class == 254 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) 255 goto error1; 256 } 257 } else { 258 /* No registration request supplied */ 259 if (!send_handler) 260 goto error1; 261 } 262 263 /* Validate device and port */ 264 port_priv = ib_get_mad_port(device, port_num); 265 if (!port_priv) { 266 ret = ERR_PTR(-ENODEV); 267 goto error1; 268 } 269 270 /* Allocate structures */ 271 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL); 272 if (!mad_agent_priv) { 273 ret = ERR_PTR(-ENOMEM); 274 goto error1; 275 } 276 277 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd, 278 IB_ACCESS_LOCAL_WRITE); 279 if (IS_ERR(mad_agent_priv->agent.mr)) { 280 ret = ERR_PTR(-ENOMEM); 281 goto error2; 282 } 283 284 if (mad_reg_req) { 285 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL); 286 if (!reg_req) { 287 ret = ERR_PTR(-ENOMEM); 288 goto error3; 289 } 290 /* Make a copy of the MAD registration request */ 291 memcpy(reg_req, mad_reg_req, sizeof *reg_req); 292 } 293 294 /* Now, fill in the various structures */ 295 mad_agent_priv->qp_info = &port_priv->qp_info[qpn]; 296 mad_agent_priv->reg_req = reg_req; 297 mad_agent_priv->agent.rmpp_version = rmpp_version; 298 mad_agent_priv->agent.device = device; 299 mad_agent_priv->agent.recv_handler = recv_handler; 300 mad_agent_priv->agent.send_handler = send_handler; 301 mad_agent_priv->agent.context = context; 302 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp; 303 mad_agent_priv->agent.port_num = port_num; 304 305 spin_lock_irqsave(&port_priv->reg_lock, flags); 306 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id; 307 308 /* 309 * Make sure MAD registration (if supplied) 310 * is non overlapping with any existing ones 311 */ 312 if (mad_reg_req) { 313 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class); 314 if (!is_vendor_class(mgmt_class)) { 315 class = port_priv->version[mad_reg_req-> 316 mgmt_class_version].class; 317 if (class) { 318 method = class->method_table[mgmt_class]; 319 if (method) { 320 if (method_in_use(&method, 321 mad_reg_req)) 322 goto error4; 323 } 324 } 325 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv, 326 mgmt_class); 327 } else { 328 /* "New" vendor class range */ 329 vendor = port_priv->version[mad_reg_req-> 330 mgmt_class_version].vendor; 331 if (vendor) { 332 vclass = vendor_class_index(mgmt_class); 333 vendor_class = vendor->vendor_class[vclass]; 334 if (vendor_class) { 335 if (is_vendor_method_in_use( 336 vendor_class, 337 mad_reg_req)) 338 goto error4; 339 } 340 } 341 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv); 342 } 343 if (ret2) { 344 ret = ERR_PTR(ret2); 345 goto error4; 346 } 347 } 348 349 /* Add mad agent into port's agent list */ 350 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list); 351 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 352 353 spin_lock_init(&mad_agent_priv->lock); 354 INIT_LIST_HEAD(&mad_agent_priv->send_list); 355 INIT_LIST_HEAD(&mad_agent_priv->wait_list); 356 INIT_LIST_HEAD(&mad_agent_priv->done_list); 357 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list); 358 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends); 359 INIT_LIST_HEAD(&mad_agent_priv->local_list); 360 INIT_WORK(&mad_agent_priv->local_work, local_completions); 361 atomic_set(&mad_agent_priv->refcount, 1); 362 init_completion(&mad_agent_priv->comp); 363 364 return &mad_agent_priv->agent; 365 366 error4: 367 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 368 kfree(reg_req); 369 error3: 370 ib_dereg_mr(mad_agent_priv->agent.mr); 371 error2: 372 kfree(mad_agent_priv); 373 error1: 374 return ret; 375 } 376 EXPORT_SYMBOL(ib_register_mad_agent); 377 378 static inline int is_snooping_sends(int mad_snoop_flags) 379 { 380 return (mad_snoop_flags & 381 (/*IB_MAD_SNOOP_POSTED_SENDS | 382 IB_MAD_SNOOP_RMPP_SENDS |*/ 383 IB_MAD_SNOOP_SEND_COMPLETIONS /*| 384 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/)); 385 } 386 387 static inline int is_snooping_recvs(int mad_snoop_flags) 388 { 389 return (mad_snoop_flags & 390 (IB_MAD_SNOOP_RECVS /*| 391 IB_MAD_SNOOP_RMPP_RECVS*/)); 392 } 393 394 static int register_snoop_agent(struct ib_mad_qp_info *qp_info, 395 struct ib_mad_snoop_private *mad_snoop_priv) 396 { 397 struct ib_mad_snoop_private **new_snoop_table; 398 unsigned long flags; 399 int i; 400 401 spin_lock_irqsave(&qp_info->snoop_lock, flags); 402 /* Check for empty slot in array. */ 403 for (i = 0; i < qp_info->snoop_table_size; i++) 404 if (!qp_info->snoop_table[i]) 405 break; 406 407 if (i == qp_info->snoop_table_size) { 408 /* Grow table. */ 409 new_snoop_table = kmalloc(sizeof mad_snoop_priv * 410 qp_info->snoop_table_size + 1, 411 GFP_ATOMIC); 412 if (!new_snoop_table) { 413 i = -ENOMEM; 414 goto out; 415 } 416 if (qp_info->snoop_table) { 417 memcpy(new_snoop_table, qp_info->snoop_table, 418 sizeof mad_snoop_priv * 419 qp_info->snoop_table_size); 420 kfree(qp_info->snoop_table); 421 } 422 qp_info->snoop_table = new_snoop_table; 423 qp_info->snoop_table_size++; 424 } 425 qp_info->snoop_table[i] = mad_snoop_priv; 426 atomic_inc(&qp_info->snoop_count); 427 out: 428 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 429 return i; 430 } 431 432 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device, 433 u8 port_num, 434 enum ib_qp_type qp_type, 435 int mad_snoop_flags, 436 ib_mad_snoop_handler snoop_handler, 437 ib_mad_recv_handler recv_handler, 438 void *context) 439 { 440 struct ib_mad_port_private *port_priv; 441 struct ib_mad_agent *ret; 442 struct ib_mad_snoop_private *mad_snoop_priv; 443 int qpn; 444 445 /* Validate parameters */ 446 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) || 447 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) { 448 ret = ERR_PTR(-EINVAL); 449 goto error1; 450 } 451 qpn = get_spl_qp_index(qp_type); 452 if (qpn == -1) { 453 ret = ERR_PTR(-EINVAL); 454 goto error1; 455 } 456 port_priv = ib_get_mad_port(device, port_num); 457 if (!port_priv) { 458 ret = ERR_PTR(-ENODEV); 459 goto error1; 460 } 461 /* Allocate structures */ 462 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL); 463 if (!mad_snoop_priv) { 464 ret = ERR_PTR(-ENOMEM); 465 goto error1; 466 } 467 468 /* Now, fill in the various structures */ 469 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn]; 470 mad_snoop_priv->agent.device = device; 471 mad_snoop_priv->agent.recv_handler = recv_handler; 472 mad_snoop_priv->agent.snoop_handler = snoop_handler; 473 mad_snoop_priv->agent.context = context; 474 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp; 475 mad_snoop_priv->agent.port_num = port_num; 476 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags; 477 init_completion(&mad_snoop_priv->comp); 478 mad_snoop_priv->snoop_index = register_snoop_agent( 479 &port_priv->qp_info[qpn], 480 mad_snoop_priv); 481 if (mad_snoop_priv->snoop_index < 0) { 482 ret = ERR_PTR(mad_snoop_priv->snoop_index); 483 goto error2; 484 } 485 486 atomic_set(&mad_snoop_priv->refcount, 1); 487 return &mad_snoop_priv->agent; 488 489 error2: 490 kfree(mad_snoop_priv); 491 error1: 492 return ret; 493 } 494 EXPORT_SYMBOL(ib_register_mad_snoop); 495 496 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv) 497 { 498 if (atomic_dec_and_test(&mad_agent_priv->refcount)) 499 complete(&mad_agent_priv->comp); 500 } 501 502 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv) 503 { 504 if (atomic_dec_and_test(&mad_snoop_priv->refcount)) 505 complete(&mad_snoop_priv->comp); 506 } 507 508 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv) 509 { 510 struct ib_mad_port_private *port_priv; 511 unsigned long flags; 512 513 /* Note that we could still be handling received MADs */ 514 515 /* 516 * Canceling all sends results in dropping received response 517 * MADs, preventing us from queuing additional work 518 */ 519 cancel_mads(mad_agent_priv); 520 port_priv = mad_agent_priv->qp_info->port_priv; 521 cancel_delayed_work(&mad_agent_priv->timed_work); 522 523 spin_lock_irqsave(&port_priv->reg_lock, flags); 524 remove_mad_reg_req(mad_agent_priv); 525 list_del(&mad_agent_priv->agent_list); 526 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 527 528 flush_workqueue(port_priv->wq); 529 ib_cancel_rmpp_recvs(mad_agent_priv); 530 531 deref_mad_agent(mad_agent_priv); 532 wait_for_completion(&mad_agent_priv->comp); 533 534 kfree(mad_agent_priv->reg_req); 535 ib_dereg_mr(mad_agent_priv->agent.mr); 536 kfree(mad_agent_priv); 537 } 538 539 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv) 540 { 541 struct ib_mad_qp_info *qp_info; 542 unsigned long flags; 543 544 qp_info = mad_snoop_priv->qp_info; 545 spin_lock_irqsave(&qp_info->snoop_lock, flags); 546 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL; 547 atomic_dec(&qp_info->snoop_count); 548 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 549 550 deref_snoop_agent(mad_snoop_priv); 551 wait_for_completion(&mad_snoop_priv->comp); 552 553 kfree(mad_snoop_priv); 554 } 555 556 /* 557 * ib_unregister_mad_agent - Unregisters a client from using MAD services 558 */ 559 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent) 560 { 561 struct ib_mad_agent_private *mad_agent_priv; 562 struct ib_mad_snoop_private *mad_snoop_priv; 563 564 /* If the TID is zero, the agent can only snoop. */ 565 if (mad_agent->hi_tid) { 566 mad_agent_priv = container_of(mad_agent, 567 struct ib_mad_agent_private, 568 agent); 569 unregister_mad_agent(mad_agent_priv); 570 } else { 571 mad_snoop_priv = container_of(mad_agent, 572 struct ib_mad_snoop_private, 573 agent); 574 unregister_mad_snoop(mad_snoop_priv); 575 } 576 return 0; 577 } 578 EXPORT_SYMBOL(ib_unregister_mad_agent); 579 580 static void dequeue_mad(struct ib_mad_list_head *mad_list) 581 { 582 struct ib_mad_queue *mad_queue; 583 unsigned long flags; 584 585 BUG_ON(!mad_list->mad_queue); 586 mad_queue = mad_list->mad_queue; 587 spin_lock_irqsave(&mad_queue->lock, flags); 588 list_del(&mad_list->list); 589 mad_queue->count--; 590 spin_unlock_irqrestore(&mad_queue->lock, flags); 591 } 592 593 static void snoop_send(struct ib_mad_qp_info *qp_info, 594 struct ib_mad_send_buf *send_buf, 595 struct ib_mad_send_wc *mad_send_wc, 596 int mad_snoop_flags) 597 { 598 struct ib_mad_snoop_private *mad_snoop_priv; 599 unsigned long flags; 600 int i; 601 602 spin_lock_irqsave(&qp_info->snoop_lock, flags); 603 for (i = 0; i < qp_info->snoop_table_size; i++) { 604 mad_snoop_priv = qp_info->snoop_table[i]; 605 if (!mad_snoop_priv || 606 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags)) 607 continue; 608 609 atomic_inc(&mad_snoop_priv->refcount); 610 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 611 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent, 612 send_buf, mad_send_wc); 613 deref_snoop_agent(mad_snoop_priv); 614 spin_lock_irqsave(&qp_info->snoop_lock, flags); 615 } 616 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 617 } 618 619 static void snoop_recv(struct ib_mad_qp_info *qp_info, 620 struct ib_mad_recv_wc *mad_recv_wc, 621 int mad_snoop_flags) 622 { 623 struct ib_mad_snoop_private *mad_snoop_priv; 624 unsigned long flags; 625 int i; 626 627 spin_lock_irqsave(&qp_info->snoop_lock, flags); 628 for (i = 0; i < qp_info->snoop_table_size; i++) { 629 mad_snoop_priv = qp_info->snoop_table[i]; 630 if (!mad_snoop_priv || 631 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags)) 632 continue; 633 634 atomic_inc(&mad_snoop_priv->refcount); 635 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 636 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent, 637 mad_recv_wc); 638 deref_snoop_agent(mad_snoop_priv); 639 spin_lock_irqsave(&qp_info->snoop_lock, flags); 640 } 641 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 642 } 643 644 static void build_smp_wc(struct ib_qp *qp, 645 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num, 646 struct ib_wc *wc) 647 { 648 memset(wc, 0, sizeof *wc); 649 wc->wr_id = wr_id; 650 wc->status = IB_WC_SUCCESS; 651 wc->opcode = IB_WC_RECV; 652 wc->pkey_index = pkey_index; 653 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh); 654 wc->src_qp = IB_QP0; 655 wc->qp = qp; 656 wc->slid = slid; 657 wc->sl = 0; 658 wc->dlid_path_bits = 0; 659 wc->port_num = port_num; 660 } 661 662 /* 663 * Return 0 if SMP is to be sent 664 * Return 1 if SMP was consumed locally (whether or not solicited) 665 * Return < 0 if error 666 */ 667 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv, 668 struct ib_mad_send_wr_private *mad_send_wr) 669 { 670 int ret = 0; 671 struct ib_smp *smp = mad_send_wr->send_buf.mad; 672 unsigned long flags; 673 struct ib_mad_local_private *local; 674 struct ib_mad_private *mad_priv; 675 struct ib_mad_port_private *port_priv; 676 struct ib_mad_agent_private *recv_mad_agent = NULL; 677 struct ib_device *device = mad_agent_priv->agent.device; 678 u8 port_num; 679 struct ib_wc mad_wc; 680 struct ib_send_wr *send_wr = &mad_send_wr->send_wr; 681 682 if (device->node_type == RDMA_NODE_IB_SWITCH && 683 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 684 port_num = send_wr->wr.ud.port_num; 685 else 686 port_num = mad_agent_priv->agent.port_num; 687 688 /* 689 * Directed route handling starts if the initial LID routed part of 690 * a request or the ending LID routed part of a response is empty. 691 * If we are at the start of the LID routed part, don't update the 692 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec. 693 */ 694 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) == 695 IB_LID_PERMISSIVE && 696 smi_handle_dr_smp_send(smp, device->node_type, port_num) == 697 IB_SMI_DISCARD) { 698 ret = -EINVAL; 699 printk(KERN_ERR PFX "Invalid directed route\n"); 700 goto out; 701 } 702 703 /* Check to post send on QP or process locally */ 704 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD && 705 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD) 706 goto out; 707 708 local = kmalloc(sizeof *local, GFP_ATOMIC); 709 if (!local) { 710 ret = -ENOMEM; 711 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n"); 712 goto out; 713 } 714 local->mad_priv = NULL; 715 local->recv_mad_agent = NULL; 716 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC); 717 if (!mad_priv) { 718 ret = -ENOMEM; 719 printk(KERN_ERR PFX "No memory for local response MAD\n"); 720 kfree(local); 721 goto out; 722 } 723 724 build_smp_wc(mad_agent_priv->agent.qp, 725 send_wr->wr_id, be16_to_cpu(smp->dr_slid), 726 send_wr->wr.ud.pkey_index, 727 send_wr->wr.ud.port_num, &mad_wc); 728 729 /* No GRH for DR SMP */ 730 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL, 731 (struct ib_mad *)smp, 732 (struct ib_mad *)&mad_priv->mad); 733 switch (ret) 734 { 735 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY: 736 if (ib_response_mad(&mad_priv->mad.mad) && 737 mad_agent_priv->agent.recv_handler) { 738 local->mad_priv = mad_priv; 739 local->recv_mad_agent = mad_agent_priv; 740 /* 741 * Reference MAD agent until receive 742 * side of local completion handled 743 */ 744 atomic_inc(&mad_agent_priv->refcount); 745 } else 746 kmem_cache_free(ib_mad_cache, mad_priv); 747 break; 748 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED: 749 kmem_cache_free(ib_mad_cache, mad_priv); 750 break; 751 case IB_MAD_RESULT_SUCCESS: 752 /* Treat like an incoming receive MAD */ 753 port_priv = ib_get_mad_port(mad_agent_priv->agent.device, 754 mad_agent_priv->agent.port_num); 755 if (port_priv) { 756 memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad)); 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->max_retries = send_buf->retries; 1104 mad_send_wr->retries_left = send_buf->retries; 1105 send_buf->retries = 0; 1106 /* Reference for work request to QP + response */ 1107 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0); 1108 mad_send_wr->status = IB_WC_SUCCESS; 1109 1110 /* Reference MAD agent until send completes */ 1111 atomic_inc(&mad_agent_priv->refcount); 1112 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1113 list_add_tail(&mad_send_wr->agent_list, 1114 &mad_agent_priv->send_list); 1115 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1116 1117 if (mad_agent_priv->agent.rmpp_version) { 1118 ret = ib_send_rmpp_mad(mad_send_wr); 1119 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED) 1120 ret = ib_send_mad(mad_send_wr); 1121 } else 1122 ret = ib_send_mad(mad_send_wr); 1123 if (ret < 0) { 1124 /* Fail send request */ 1125 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1126 list_del(&mad_send_wr->agent_list); 1127 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1128 atomic_dec(&mad_agent_priv->refcount); 1129 goto error; 1130 } 1131 } 1132 return 0; 1133 error: 1134 if (bad_send_buf) 1135 *bad_send_buf = send_buf; 1136 return ret; 1137 } 1138 EXPORT_SYMBOL(ib_post_send_mad); 1139 1140 /* 1141 * ib_free_recv_mad - Returns data buffers used to receive 1142 * a MAD to the access layer 1143 */ 1144 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc) 1145 { 1146 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf; 1147 struct ib_mad_private_header *mad_priv_hdr; 1148 struct ib_mad_private *priv; 1149 struct list_head free_list; 1150 1151 INIT_LIST_HEAD(&free_list); 1152 list_splice_init(&mad_recv_wc->rmpp_list, &free_list); 1153 1154 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf, 1155 &free_list, list) { 1156 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc, 1157 recv_buf); 1158 mad_priv_hdr = container_of(mad_recv_wc, 1159 struct ib_mad_private_header, 1160 recv_wc); 1161 priv = container_of(mad_priv_hdr, struct ib_mad_private, 1162 header); 1163 kmem_cache_free(ib_mad_cache, priv); 1164 } 1165 } 1166 EXPORT_SYMBOL(ib_free_recv_mad); 1167 1168 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp, 1169 u8 rmpp_version, 1170 ib_mad_send_handler send_handler, 1171 ib_mad_recv_handler recv_handler, 1172 void *context) 1173 { 1174 return ERR_PTR(-EINVAL); /* XXX: for now */ 1175 } 1176 EXPORT_SYMBOL(ib_redirect_mad_qp); 1177 1178 int ib_process_mad_wc(struct ib_mad_agent *mad_agent, 1179 struct ib_wc *wc) 1180 { 1181 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n"); 1182 return 0; 1183 } 1184 EXPORT_SYMBOL(ib_process_mad_wc); 1185 1186 static int method_in_use(struct ib_mad_mgmt_method_table **method, 1187 struct ib_mad_reg_req *mad_reg_req) 1188 { 1189 int i; 1190 1191 for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS); 1192 i < IB_MGMT_MAX_METHODS; 1193 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS, 1194 1+i)) { 1195 if ((*method)->agent[i]) { 1196 printk(KERN_ERR PFX "Method %d already in use\n", i); 1197 return -EINVAL; 1198 } 1199 } 1200 return 0; 1201 } 1202 1203 static int allocate_method_table(struct ib_mad_mgmt_method_table **method) 1204 { 1205 /* Allocate management method table */ 1206 *method = kzalloc(sizeof **method, GFP_ATOMIC); 1207 if (!*method) { 1208 printk(KERN_ERR PFX "No memory for " 1209 "ib_mad_mgmt_method_table\n"); 1210 return -ENOMEM; 1211 } 1212 1213 return 0; 1214 } 1215 1216 /* 1217 * Check to see if there are any methods still in use 1218 */ 1219 static int check_method_table(struct ib_mad_mgmt_method_table *method) 1220 { 1221 int i; 1222 1223 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) 1224 if (method->agent[i]) 1225 return 1; 1226 return 0; 1227 } 1228 1229 /* 1230 * Check to see if there are any method tables for this class still in use 1231 */ 1232 static int check_class_table(struct ib_mad_mgmt_class_table *class) 1233 { 1234 int i; 1235 1236 for (i = 0; i < MAX_MGMT_CLASS; i++) 1237 if (class->method_table[i]) 1238 return 1; 1239 return 0; 1240 } 1241 1242 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class) 1243 { 1244 int i; 1245 1246 for (i = 0; i < MAX_MGMT_OUI; i++) 1247 if (vendor_class->method_table[i]) 1248 return 1; 1249 return 0; 1250 } 1251 1252 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class, 1253 char *oui) 1254 { 1255 int i; 1256 1257 for (i = 0; i < MAX_MGMT_OUI; i++) 1258 /* Is there matching OUI for this vendor class ? */ 1259 if (!memcmp(vendor_class->oui[i], oui, 3)) 1260 return i; 1261 1262 return -1; 1263 } 1264 1265 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor) 1266 { 1267 int i; 1268 1269 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++) 1270 if (vendor->vendor_class[i]) 1271 return 1; 1272 1273 return 0; 1274 } 1275 1276 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method, 1277 struct ib_mad_agent_private *agent) 1278 { 1279 int i; 1280 1281 /* Remove any methods for this mad agent */ 1282 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) { 1283 if (method->agent[i] == agent) { 1284 method->agent[i] = NULL; 1285 } 1286 } 1287 } 1288 1289 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req, 1290 struct ib_mad_agent_private *agent_priv, 1291 u8 mgmt_class) 1292 { 1293 struct ib_mad_port_private *port_priv; 1294 struct ib_mad_mgmt_class_table **class; 1295 struct ib_mad_mgmt_method_table **method; 1296 int i, ret; 1297 1298 port_priv = agent_priv->qp_info->port_priv; 1299 class = &port_priv->version[mad_reg_req->mgmt_class_version].class; 1300 if (!*class) { 1301 /* Allocate management class table for "new" class version */ 1302 *class = kzalloc(sizeof **class, GFP_ATOMIC); 1303 if (!*class) { 1304 printk(KERN_ERR PFX "No memory for " 1305 "ib_mad_mgmt_class_table\n"); 1306 ret = -ENOMEM; 1307 goto error1; 1308 } 1309 1310 /* Allocate method table for this management class */ 1311 method = &(*class)->method_table[mgmt_class]; 1312 if ((ret = allocate_method_table(method))) 1313 goto error2; 1314 } else { 1315 method = &(*class)->method_table[mgmt_class]; 1316 if (!*method) { 1317 /* Allocate method table for this management class */ 1318 if ((ret = allocate_method_table(method))) 1319 goto error1; 1320 } 1321 } 1322 1323 /* Now, make sure methods are not already in use */ 1324 if (method_in_use(method, mad_reg_req)) 1325 goto error3; 1326 1327 /* Finally, add in methods being registered */ 1328 for (i = find_first_bit(mad_reg_req->method_mask, 1329 IB_MGMT_MAX_METHODS); 1330 i < IB_MGMT_MAX_METHODS; 1331 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS, 1332 1+i)) { 1333 (*method)->agent[i] = agent_priv; 1334 } 1335 return 0; 1336 1337 error3: 1338 /* Remove any methods for this mad agent */ 1339 remove_methods_mad_agent(*method, agent_priv); 1340 /* Now, check to see if there are any methods in use */ 1341 if (!check_method_table(*method)) { 1342 /* If not, release management method table */ 1343 kfree(*method); 1344 *method = NULL; 1345 } 1346 ret = -EINVAL; 1347 goto error1; 1348 error2: 1349 kfree(*class); 1350 *class = NULL; 1351 error1: 1352 return ret; 1353 } 1354 1355 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req, 1356 struct ib_mad_agent_private *agent_priv) 1357 { 1358 struct ib_mad_port_private *port_priv; 1359 struct ib_mad_mgmt_vendor_class_table **vendor_table; 1360 struct ib_mad_mgmt_vendor_class_table *vendor = NULL; 1361 struct ib_mad_mgmt_vendor_class *vendor_class = NULL; 1362 struct ib_mad_mgmt_method_table **method; 1363 int i, ret = -ENOMEM; 1364 u8 vclass; 1365 1366 /* "New" vendor (with OUI) class */ 1367 vclass = vendor_class_index(mad_reg_req->mgmt_class); 1368 port_priv = agent_priv->qp_info->port_priv; 1369 vendor_table = &port_priv->version[ 1370 mad_reg_req->mgmt_class_version].vendor; 1371 if (!*vendor_table) { 1372 /* Allocate mgmt vendor class table for "new" class version */ 1373 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC); 1374 if (!vendor) { 1375 printk(KERN_ERR PFX "No memory for " 1376 "ib_mad_mgmt_vendor_class_table\n"); 1377 goto error1; 1378 } 1379 1380 *vendor_table = vendor; 1381 } 1382 if (!(*vendor_table)->vendor_class[vclass]) { 1383 /* Allocate table for this management vendor class */ 1384 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC); 1385 if (!vendor_class) { 1386 printk(KERN_ERR PFX "No memory for " 1387 "ib_mad_mgmt_vendor_class\n"); 1388 goto error2; 1389 } 1390 1391 (*vendor_table)->vendor_class[vclass] = vendor_class; 1392 } 1393 for (i = 0; i < MAX_MGMT_OUI; i++) { 1394 /* Is there matching OUI for this vendor class ? */ 1395 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i], 1396 mad_reg_req->oui, 3)) { 1397 method = &(*vendor_table)->vendor_class[ 1398 vclass]->method_table[i]; 1399 BUG_ON(!*method); 1400 goto check_in_use; 1401 } 1402 } 1403 for (i = 0; i < MAX_MGMT_OUI; i++) { 1404 /* OUI slot available ? */ 1405 if (!is_vendor_oui((*vendor_table)->vendor_class[ 1406 vclass]->oui[i])) { 1407 method = &(*vendor_table)->vendor_class[ 1408 vclass]->method_table[i]; 1409 BUG_ON(*method); 1410 /* Allocate method table for this OUI */ 1411 if ((ret = allocate_method_table(method))) 1412 goto error3; 1413 memcpy((*vendor_table)->vendor_class[vclass]->oui[i], 1414 mad_reg_req->oui, 3); 1415 goto check_in_use; 1416 } 1417 } 1418 printk(KERN_ERR PFX "All OUI slots in use\n"); 1419 goto error3; 1420 1421 check_in_use: 1422 /* Now, make sure methods are not already in use */ 1423 if (method_in_use(method, mad_reg_req)) 1424 goto error4; 1425 1426 /* Finally, add in methods being registered */ 1427 for (i = find_first_bit(mad_reg_req->method_mask, 1428 IB_MGMT_MAX_METHODS); 1429 i < IB_MGMT_MAX_METHODS; 1430 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS, 1431 1+i)) { 1432 (*method)->agent[i] = agent_priv; 1433 } 1434 return 0; 1435 1436 error4: 1437 /* Remove any methods for this mad agent */ 1438 remove_methods_mad_agent(*method, agent_priv); 1439 /* Now, check to see if there are any methods in use */ 1440 if (!check_method_table(*method)) { 1441 /* If not, release management method table */ 1442 kfree(*method); 1443 *method = NULL; 1444 } 1445 ret = -EINVAL; 1446 error3: 1447 if (vendor_class) { 1448 (*vendor_table)->vendor_class[vclass] = NULL; 1449 kfree(vendor_class); 1450 } 1451 error2: 1452 if (vendor) { 1453 *vendor_table = NULL; 1454 kfree(vendor); 1455 } 1456 error1: 1457 return ret; 1458 } 1459 1460 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv) 1461 { 1462 struct ib_mad_port_private *port_priv; 1463 struct ib_mad_mgmt_class_table *class; 1464 struct ib_mad_mgmt_method_table *method; 1465 struct ib_mad_mgmt_vendor_class_table *vendor; 1466 struct ib_mad_mgmt_vendor_class *vendor_class; 1467 int index; 1468 u8 mgmt_class; 1469 1470 /* 1471 * Was MAD registration request supplied 1472 * with original registration ? 1473 */ 1474 if (!agent_priv->reg_req) { 1475 goto out; 1476 } 1477 1478 port_priv = agent_priv->qp_info->port_priv; 1479 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class); 1480 class = port_priv->version[ 1481 agent_priv->reg_req->mgmt_class_version].class; 1482 if (!class) 1483 goto vendor_check; 1484 1485 method = class->method_table[mgmt_class]; 1486 if (method) { 1487 /* Remove any methods for this mad agent */ 1488 remove_methods_mad_agent(method, agent_priv); 1489 /* Now, check to see if there are any methods still in use */ 1490 if (!check_method_table(method)) { 1491 /* If not, release management method table */ 1492 kfree(method); 1493 class->method_table[mgmt_class] = NULL; 1494 /* Any management classes left ? */ 1495 if (!check_class_table(class)) { 1496 /* If not, release management class table */ 1497 kfree(class); 1498 port_priv->version[ 1499 agent_priv->reg_req-> 1500 mgmt_class_version].class = NULL; 1501 } 1502 } 1503 } 1504 1505 vendor_check: 1506 if (!is_vendor_class(mgmt_class)) 1507 goto out; 1508 1509 /* normalize mgmt_class to vendor range 2 */ 1510 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class); 1511 vendor = port_priv->version[ 1512 agent_priv->reg_req->mgmt_class_version].vendor; 1513 1514 if (!vendor) 1515 goto out; 1516 1517 vendor_class = vendor->vendor_class[mgmt_class]; 1518 if (vendor_class) { 1519 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui); 1520 if (index < 0) 1521 goto out; 1522 method = vendor_class->method_table[index]; 1523 if (method) { 1524 /* Remove any methods for this mad agent */ 1525 remove_methods_mad_agent(method, agent_priv); 1526 /* 1527 * Now, check to see if there are 1528 * any methods still in use 1529 */ 1530 if (!check_method_table(method)) { 1531 /* If not, release management method table */ 1532 kfree(method); 1533 vendor_class->method_table[index] = NULL; 1534 memset(vendor_class->oui[index], 0, 3); 1535 /* Any OUIs left ? */ 1536 if (!check_vendor_class(vendor_class)) { 1537 /* If not, release vendor class table */ 1538 kfree(vendor_class); 1539 vendor->vendor_class[mgmt_class] = NULL; 1540 /* Any other vendor classes left ? */ 1541 if (!check_vendor_table(vendor)) { 1542 kfree(vendor); 1543 port_priv->version[ 1544 agent_priv->reg_req-> 1545 mgmt_class_version]. 1546 vendor = NULL; 1547 } 1548 } 1549 } 1550 } 1551 } 1552 1553 out: 1554 return; 1555 } 1556 1557 static struct ib_mad_agent_private * 1558 find_mad_agent(struct ib_mad_port_private *port_priv, 1559 struct ib_mad *mad) 1560 { 1561 struct ib_mad_agent_private *mad_agent = NULL; 1562 unsigned long flags; 1563 1564 spin_lock_irqsave(&port_priv->reg_lock, flags); 1565 if (ib_response_mad(mad)) { 1566 u32 hi_tid; 1567 struct ib_mad_agent_private *entry; 1568 1569 /* 1570 * Routing is based on high 32 bits of transaction ID 1571 * of MAD. 1572 */ 1573 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32; 1574 list_for_each_entry(entry, &port_priv->agent_list, agent_list) { 1575 if (entry->agent.hi_tid == hi_tid) { 1576 mad_agent = entry; 1577 break; 1578 } 1579 } 1580 } else { 1581 struct ib_mad_mgmt_class_table *class; 1582 struct ib_mad_mgmt_method_table *method; 1583 struct ib_mad_mgmt_vendor_class_table *vendor; 1584 struct ib_mad_mgmt_vendor_class *vendor_class; 1585 struct ib_vendor_mad *vendor_mad; 1586 int index; 1587 1588 /* 1589 * Routing is based on version, class, and method 1590 * For "newer" vendor MADs, also based on OUI 1591 */ 1592 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION) 1593 goto out; 1594 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) { 1595 class = port_priv->version[ 1596 mad->mad_hdr.class_version].class; 1597 if (!class) 1598 goto out; 1599 method = class->method_table[convert_mgmt_class( 1600 mad->mad_hdr.mgmt_class)]; 1601 if (method) 1602 mad_agent = method->agent[mad->mad_hdr.method & 1603 ~IB_MGMT_METHOD_RESP]; 1604 } else { 1605 vendor = port_priv->version[ 1606 mad->mad_hdr.class_version].vendor; 1607 if (!vendor) 1608 goto out; 1609 vendor_class = vendor->vendor_class[vendor_class_index( 1610 mad->mad_hdr.mgmt_class)]; 1611 if (!vendor_class) 1612 goto out; 1613 /* Find matching OUI */ 1614 vendor_mad = (struct ib_vendor_mad *)mad; 1615 index = find_vendor_oui(vendor_class, vendor_mad->oui); 1616 if (index == -1) 1617 goto out; 1618 method = vendor_class->method_table[index]; 1619 if (method) { 1620 mad_agent = method->agent[mad->mad_hdr.method & 1621 ~IB_MGMT_METHOD_RESP]; 1622 } 1623 } 1624 } 1625 1626 if (mad_agent) { 1627 if (mad_agent->agent.recv_handler) 1628 atomic_inc(&mad_agent->refcount); 1629 else { 1630 printk(KERN_NOTICE PFX "No receive handler for client " 1631 "%p on port %d\n", 1632 &mad_agent->agent, port_priv->port_num); 1633 mad_agent = NULL; 1634 } 1635 } 1636 out: 1637 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 1638 1639 return mad_agent; 1640 } 1641 1642 static int validate_mad(struct ib_mad *mad, u32 qp_num) 1643 { 1644 int valid = 0; 1645 1646 /* Make sure MAD base version is understood */ 1647 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) { 1648 printk(KERN_ERR PFX "MAD received with unsupported base " 1649 "version %d\n", mad->mad_hdr.base_version); 1650 goto out; 1651 } 1652 1653 /* Filter SMI packets sent to other than QP0 */ 1654 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) || 1655 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) { 1656 if (qp_num == 0) 1657 valid = 1; 1658 } else { 1659 /* Filter GSI packets sent to QP0 */ 1660 if (qp_num != 0) 1661 valid = 1; 1662 } 1663 1664 out: 1665 return valid; 1666 } 1667 1668 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv, 1669 struct ib_mad_hdr *mad_hdr) 1670 { 1671 struct ib_rmpp_mad *rmpp_mad; 1672 1673 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr; 1674 return !mad_agent_priv->agent.rmpp_version || 1675 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 1676 IB_MGMT_RMPP_FLAG_ACTIVE) || 1677 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA); 1678 } 1679 1680 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr, 1681 struct ib_mad_recv_wc *rwc) 1682 { 1683 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class == 1684 rwc->recv_buf.mad->mad_hdr.mgmt_class; 1685 } 1686 1687 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv, 1688 struct ib_mad_send_wr_private *wr, 1689 struct ib_mad_recv_wc *rwc ) 1690 { 1691 struct ib_ah_attr attr; 1692 u8 send_resp, rcv_resp; 1693 union ib_gid sgid; 1694 struct ib_device *device = mad_agent_priv->agent.device; 1695 u8 port_num = mad_agent_priv->agent.port_num; 1696 u8 lmc; 1697 1698 send_resp = ((struct ib_mad *)(wr->send_buf.mad))-> 1699 mad_hdr.method & IB_MGMT_METHOD_RESP; 1700 rcv_resp = rwc->recv_buf.mad->mad_hdr.method & IB_MGMT_METHOD_RESP; 1701 1702 if (send_resp == rcv_resp) 1703 /* both requests, or both responses. GIDs different */ 1704 return 0; 1705 1706 if (ib_query_ah(wr->send_buf.ah, &attr)) 1707 /* Assume not equal, to avoid false positives. */ 1708 return 0; 1709 1710 if (!!(attr.ah_flags & IB_AH_GRH) != 1711 !!(rwc->wc->wc_flags & IB_WC_GRH)) 1712 /* one has GID, other does not. Assume different */ 1713 return 0; 1714 1715 if (!send_resp && rcv_resp) { 1716 /* is request/response. */ 1717 if (!(attr.ah_flags & IB_AH_GRH)) { 1718 if (ib_get_cached_lmc(device, port_num, &lmc)) 1719 return 0; 1720 return (!lmc || !((attr.src_path_bits ^ 1721 rwc->wc->dlid_path_bits) & 1722 ((1 << lmc) - 1))); 1723 } else { 1724 if (ib_get_cached_gid(device, port_num, 1725 attr.grh.sgid_index, &sgid)) 1726 return 0; 1727 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw, 1728 16); 1729 } 1730 } 1731 1732 if (!(attr.ah_flags & IB_AH_GRH)) 1733 return attr.dlid == rwc->wc->slid; 1734 else 1735 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw, 1736 16); 1737 } 1738 1739 static inline int is_direct(u8 class) 1740 { 1741 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE); 1742 } 1743 1744 struct ib_mad_send_wr_private* 1745 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv, 1746 struct ib_mad_recv_wc *wc) 1747 { 1748 struct ib_mad_send_wr_private *wr; 1749 struct ib_mad *mad; 1750 1751 mad = (struct ib_mad *)wc->recv_buf.mad; 1752 1753 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) { 1754 if ((wr->tid == mad->mad_hdr.tid) && 1755 rcv_has_same_class(wr, wc) && 1756 /* 1757 * Don't check GID for direct routed MADs. 1758 * These might have permissive LIDs. 1759 */ 1760 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) || 1761 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1762 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1763 } 1764 1765 /* 1766 * It's possible to receive the response before we've 1767 * been notified that the send has completed 1768 */ 1769 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) { 1770 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) && 1771 wr->tid == mad->mad_hdr.tid && 1772 wr->timeout && 1773 rcv_has_same_class(wr, wc) && 1774 /* 1775 * Don't check GID for direct routed MADs. 1776 * These might have permissive LIDs. 1777 */ 1778 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) || 1779 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1780 /* Verify request has not been canceled */ 1781 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1782 } 1783 return NULL; 1784 } 1785 1786 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr) 1787 { 1788 mad_send_wr->timeout = 0; 1789 if (mad_send_wr->refcount == 1) 1790 list_move_tail(&mad_send_wr->agent_list, 1791 &mad_send_wr->mad_agent_priv->done_list); 1792 } 1793 1794 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv, 1795 struct ib_mad_recv_wc *mad_recv_wc) 1796 { 1797 struct ib_mad_send_wr_private *mad_send_wr; 1798 struct ib_mad_send_wc mad_send_wc; 1799 unsigned long flags; 1800 1801 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list); 1802 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list); 1803 if (mad_agent_priv->agent.rmpp_version) { 1804 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv, 1805 mad_recv_wc); 1806 if (!mad_recv_wc) { 1807 deref_mad_agent(mad_agent_priv); 1808 return; 1809 } 1810 } 1811 1812 /* Complete corresponding request */ 1813 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) { 1814 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1815 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc); 1816 if (!mad_send_wr) { 1817 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1818 ib_free_recv_mad(mad_recv_wc); 1819 deref_mad_agent(mad_agent_priv); 1820 return; 1821 } 1822 ib_mark_mad_done(mad_send_wr); 1823 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1824 1825 /* Defined behavior is to complete response before request */ 1826 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf; 1827 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, 1828 mad_recv_wc); 1829 atomic_dec(&mad_agent_priv->refcount); 1830 1831 mad_send_wc.status = IB_WC_SUCCESS; 1832 mad_send_wc.vendor_err = 0; 1833 mad_send_wc.send_buf = &mad_send_wr->send_buf; 1834 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 1835 } else { 1836 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, 1837 mad_recv_wc); 1838 deref_mad_agent(mad_agent_priv); 1839 } 1840 } 1841 1842 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv, 1843 struct ib_wc *wc) 1844 { 1845 struct ib_mad_qp_info *qp_info; 1846 struct ib_mad_private_header *mad_priv_hdr; 1847 struct ib_mad_private *recv, *response = NULL; 1848 struct ib_mad_list_head *mad_list; 1849 struct ib_mad_agent_private *mad_agent; 1850 int port_num; 1851 1852 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 1853 qp_info = mad_list->mad_queue->qp_info; 1854 dequeue_mad(mad_list); 1855 1856 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header, 1857 mad_list); 1858 recv = container_of(mad_priv_hdr, struct ib_mad_private, header); 1859 ib_dma_unmap_single(port_priv->device, 1860 recv->header.mapping, 1861 sizeof(struct ib_mad_private) - 1862 sizeof(struct ib_mad_private_header), 1863 DMA_FROM_DEVICE); 1864 1865 /* Setup MAD receive work completion from "normal" work completion */ 1866 recv->header.wc = *wc; 1867 recv->header.recv_wc.wc = &recv->header.wc; 1868 recv->header.recv_wc.mad_len = sizeof(struct ib_mad); 1869 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad; 1870 recv->header.recv_wc.recv_buf.grh = &recv->grh; 1871 1872 if (atomic_read(&qp_info->snoop_count)) 1873 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS); 1874 1875 /* Validate MAD */ 1876 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num)) 1877 goto out; 1878 1879 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL); 1880 if (!response) { 1881 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory " 1882 "for response buffer\n"); 1883 goto out; 1884 } 1885 1886 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) 1887 port_num = wc->port_num; 1888 else 1889 port_num = port_priv->port_num; 1890 1891 if (recv->mad.mad.mad_hdr.mgmt_class == 1892 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 1893 enum smi_forward_action retsmi; 1894 1895 if (smi_handle_dr_smp_recv(&recv->mad.smp, 1896 port_priv->device->node_type, 1897 port_num, 1898 port_priv->device->phys_port_cnt) == 1899 IB_SMI_DISCARD) 1900 goto out; 1901 1902 retsmi = smi_check_forward_dr_smp(&recv->mad.smp); 1903 if (retsmi == IB_SMI_LOCAL) 1904 goto local; 1905 1906 if (retsmi == IB_SMI_SEND) { /* don't forward */ 1907 if (smi_handle_dr_smp_send(&recv->mad.smp, 1908 port_priv->device->node_type, 1909 port_num) == IB_SMI_DISCARD) 1910 goto out; 1911 1912 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD) 1913 goto out; 1914 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) { 1915 /* forward case for switches */ 1916 memcpy(response, recv, sizeof(*response)); 1917 response->header.recv_wc.wc = &response->header.wc; 1918 response->header.recv_wc.recv_buf.mad = &response->mad.mad; 1919 response->header.recv_wc.recv_buf.grh = &response->grh; 1920 1921 agent_send_response(&response->mad.mad, 1922 &response->grh, wc, 1923 port_priv->device, 1924 smi_get_fwd_port(&recv->mad.smp), 1925 qp_info->qp->qp_num); 1926 1927 goto out; 1928 } 1929 } 1930 1931 local: 1932 /* Give driver "right of first refusal" on incoming MAD */ 1933 if (port_priv->device->process_mad) { 1934 int ret; 1935 1936 ret = port_priv->device->process_mad(port_priv->device, 0, 1937 port_priv->port_num, 1938 wc, &recv->grh, 1939 &recv->mad.mad, 1940 &response->mad.mad); 1941 if (ret & IB_MAD_RESULT_SUCCESS) { 1942 if (ret & IB_MAD_RESULT_CONSUMED) 1943 goto out; 1944 if (ret & IB_MAD_RESULT_REPLY) { 1945 agent_send_response(&response->mad.mad, 1946 &recv->grh, wc, 1947 port_priv->device, 1948 port_num, 1949 qp_info->qp->qp_num); 1950 goto out; 1951 } 1952 } 1953 } 1954 1955 mad_agent = find_mad_agent(port_priv, &recv->mad.mad); 1956 if (mad_agent) { 1957 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc); 1958 /* 1959 * recv is freed up in error cases in ib_mad_complete_recv 1960 * or via recv_handler in ib_mad_complete_recv() 1961 */ 1962 recv = NULL; 1963 } 1964 1965 out: 1966 /* Post another receive request for this QP */ 1967 if (response) { 1968 ib_mad_post_receive_mads(qp_info, response); 1969 if (recv) 1970 kmem_cache_free(ib_mad_cache, recv); 1971 } else 1972 ib_mad_post_receive_mads(qp_info, recv); 1973 } 1974 1975 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv) 1976 { 1977 struct ib_mad_send_wr_private *mad_send_wr; 1978 unsigned long delay; 1979 1980 if (list_empty(&mad_agent_priv->wait_list)) { 1981 cancel_delayed_work(&mad_agent_priv->timed_work); 1982 } else { 1983 mad_send_wr = list_entry(mad_agent_priv->wait_list.next, 1984 struct ib_mad_send_wr_private, 1985 agent_list); 1986 1987 if (time_after(mad_agent_priv->timeout, 1988 mad_send_wr->timeout)) { 1989 mad_agent_priv->timeout = mad_send_wr->timeout; 1990 cancel_delayed_work(&mad_agent_priv->timed_work); 1991 delay = mad_send_wr->timeout - jiffies; 1992 if ((long)delay <= 0) 1993 delay = 1; 1994 queue_delayed_work(mad_agent_priv->qp_info-> 1995 port_priv->wq, 1996 &mad_agent_priv->timed_work, delay); 1997 } 1998 } 1999 } 2000 2001 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr) 2002 { 2003 struct ib_mad_agent_private *mad_agent_priv; 2004 struct ib_mad_send_wr_private *temp_mad_send_wr; 2005 struct list_head *list_item; 2006 unsigned long delay; 2007 2008 mad_agent_priv = mad_send_wr->mad_agent_priv; 2009 list_del(&mad_send_wr->agent_list); 2010 2011 delay = mad_send_wr->timeout; 2012 mad_send_wr->timeout += jiffies; 2013 2014 if (delay) { 2015 list_for_each_prev(list_item, &mad_agent_priv->wait_list) { 2016 temp_mad_send_wr = list_entry(list_item, 2017 struct ib_mad_send_wr_private, 2018 agent_list); 2019 if (time_after(mad_send_wr->timeout, 2020 temp_mad_send_wr->timeout)) 2021 break; 2022 } 2023 } 2024 else 2025 list_item = &mad_agent_priv->wait_list; 2026 list_add(&mad_send_wr->agent_list, list_item); 2027 2028 /* Reschedule a work item if we have a shorter timeout */ 2029 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) { 2030 cancel_delayed_work(&mad_agent_priv->timed_work); 2031 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq, 2032 &mad_agent_priv->timed_work, delay); 2033 } 2034 } 2035 2036 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr, 2037 int timeout_ms) 2038 { 2039 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2040 wait_for_response(mad_send_wr); 2041 } 2042 2043 /* 2044 * Process a send work completion 2045 */ 2046 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr, 2047 struct ib_mad_send_wc *mad_send_wc) 2048 { 2049 struct ib_mad_agent_private *mad_agent_priv; 2050 unsigned long flags; 2051 int ret; 2052 2053 mad_agent_priv = mad_send_wr->mad_agent_priv; 2054 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2055 if (mad_agent_priv->agent.rmpp_version) { 2056 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc); 2057 if (ret == IB_RMPP_RESULT_CONSUMED) 2058 goto done; 2059 } else 2060 ret = IB_RMPP_RESULT_UNHANDLED; 2061 2062 if (mad_send_wc->status != IB_WC_SUCCESS && 2063 mad_send_wr->status == IB_WC_SUCCESS) { 2064 mad_send_wr->status = mad_send_wc->status; 2065 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2066 } 2067 2068 if (--mad_send_wr->refcount > 0) { 2069 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout && 2070 mad_send_wr->status == IB_WC_SUCCESS) { 2071 wait_for_response(mad_send_wr); 2072 } 2073 goto done; 2074 } 2075 2076 /* Remove send from MAD agent and notify client of completion */ 2077 list_del(&mad_send_wr->agent_list); 2078 adjust_timeout(mad_agent_priv); 2079 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2080 2081 if (mad_send_wr->status != IB_WC_SUCCESS ) 2082 mad_send_wc->status = mad_send_wr->status; 2083 if (ret == IB_RMPP_RESULT_INTERNAL) 2084 ib_rmpp_send_handler(mad_send_wc); 2085 else 2086 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2087 mad_send_wc); 2088 2089 /* Release reference on agent taken when sending */ 2090 deref_mad_agent(mad_agent_priv); 2091 return; 2092 done: 2093 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2094 } 2095 2096 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv, 2097 struct ib_wc *wc) 2098 { 2099 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr; 2100 struct ib_mad_list_head *mad_list; 2101 struct ib_mad_qp_info *qp_info; 2102 struct ib_mad_queue *send_queue; 2103 struct ib_send_wr *bad_send_wr; 2104 struct ib_mad_send_wc mad_send_wc; 2105 unsigned long flags; 2106 int ret; 2107 2108 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 2109 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2110 mad_list); 2111 send_queue = mad_list->mad_queue; 2112 qp_info = send_queue->qp_info; 2113 2114 retry: 2115 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2116 mad_send_wr->header_mapping, 2117 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE); 2118 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2119 mad_send_wr->payload_mapping, 2120 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE); 2121 queued_send_wr = NULL; 2122 spin_lock_irqsave(&send_queue->lock, flags); 2123 list_del(&mad_list->list); 2124 2125 /* Move queued send to the send queue */ 2126 if (send_queue->count-- > send_queue->max_active) { 2127 mad_list = container_of(qp_info->overflow_list.next, 2128 struct ib_mad_list_head, list); 2129 queued_send_wr = container_of(mad_list, 2130 struct ib_mad_send_wr_private, 2131 mad_list); 2132 list_move_tail(&mad_list->list, &send_queue->list); 2133 } 2134 spin_unlock_irqrestore(&send_queue->lock, flags); 2135 2136 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2137 mad_send_wc.status = wc->status; 2138 mad_send_wc.vendor_err = wc->vendor_err; 2139 if (atomic_read(&qp_info->snoop_count)) 2140 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc, 2141 IB_MAD_SNOOP_SEND_COMPLETIONS); 2142 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 2143 2144 if (queued_send_wr) { 2145 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr, 2146 &bad_send_wr); 2147 if (ret) { 2148 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret); 2149 mad_send_wr = queued_send_wr; 2150 wc->status = IB_WC_LOC_QP_OP_ERR; 2151 goto retry; 2152 } 2153 } 2154 } 2155 2156 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info) 2157 { 2158 struct ib_mad_send_wr_private *mad_send_wr; 2159 struct ib_mad_list_head *mad_list; 2160 unsigned long flags; 2161 2162 spin_lock_irqsave(&qp_info->send_queue.lock, flags); 2163 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) { 2164 mad_send_wr = container_of(mad_list, 2165 struct ib_mad_send_wr_private, 2166 mad_list); 2167 mad_send_wr->retry = 1; 2168 } 2169 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); 2170 } 2171 2172 static void mad_error_handler(struct ib_mad_port_private *port_priv, 2173 struct ib_wc *wc) 2174 { 2175 struct ib_mad_list_head *mad_list; 2176 struct ib_mad_qp_info *qp_info; 2177 struct ib_mad_send_wr_private *mad_send_wr; 2178 int ret; 2179 2180 /* Determine if failure was a send or receive */ 2181 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 2182 qp_info = mad_list->mad_queue->qp_info; 2183 if (mad_list->mad_queue == &qp_info->recv_queue) 2184 /* 2185 * Receive errors indicate that the QP has entered the error 2186 * state - error handling/shutdown code will cleanup 2187 */ 2188 return; 2189 2190 /* 2191 * Send errors will transition the QP to SQE - move 2192 * QP to RTS and repost flushed work requests 2193 */ 2194 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2195 mad_list); 2196 if (wc->status == IB_WC_WR_FLUSH_ERR) { 2197 if (mad_send_wr->retry) { 2198 /* Repost send */ 2199 struct ib_send_wr *bad_send_wr; 2200 2201 mad_send_wr->retry = 0; 2202 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr, 2203 &bad_send_wr); 2204 if (ret) 2205 ib_mad_send_done_handler(port_priv, wc); 2206 } else 2207 ib_mad_send_done_handler(port_priv, wc); 2208 } else { 2209 struct ib_qp_attr *attr; 2210 2211 /* Transition QP to RTS and fail offending send */ 2212 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2213 if (attr) { 2214 attr->qp_state = IB_QPS_RTS; 2215 attr->cur_qp_state = IB_QPS_SQE; 2216 ret = ib_modify_qp(qp_info->qp, attr, 2217 IB_QP_STATE | IB_QP_CUR_STATE); 2218 kfree(attr); 2219 if (ret) 2220 printk(KERN_ERR PFX "mad_error_handler - " 2221 "ib_modify_qp to RTS : %d\n", ret); 2222 else 2223 mark_sends_for_retry(qp_info); 2224 } 2225 ib_mad_send_done_handler(port_priv, wc); 2226 } 2227 } 2228 2229 /* 2230 * IB MAD completion callback 2231 */ 2232 static void ib_mad_completion_handler(struct work_struct *work) 2233 { 2234 struct ib_mad_port_private *port_priv; 2235 struct ib_wc wc; 2236 2237 port_priv = container_of(work, struct ib_mad_port_private, work); 2238 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); 2239 2240 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) { 2241 if (wc.status == IB_WC_SUCCESS) { 2242 switch (wc.opcode) { 2243 case IB_WC_SEND: 2244 ib_mad_send_done_handler(port_priv, &wc); 2245 break; 2246 case IB_WC_RECV: 2247 ib_mad_recv_done_handler(port_priv, &wc); 2248 break; 2249 default: 2250 BUG_ON(1); 2251 break; 2252 } 2253 } else 2254 mad_error_handler(port_priv, &wc); 2255 } 2256 } 2257 2258 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv) 2259 { 2260 unsigned long flags; 2261 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr; 2262 struct ib_mad_send_wc mad_send_wc; 2263 struct list_head cancel_list; 2264 2265 INIT_LIST_HEAD(&cancel_list); 2266 2267 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2268 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2269 &mad_agent_priv->send_list, agent_list) { 2270 if (mad_send_wr->status == IB_WC_SUCCESS) { 2271 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2272 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2273 } 2274 } 2275 2276 /* Empty wait list to prevent receives from finding a request */ 2277 list_splice_init(&mad_agent_priv->wait_list, &cancel_list); 2278 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2279 2280 /* Report all cancelled requests */ 2281 mad_send_wc.status = IB_WC_WR_FLUSH_ERR; 2282 mad_send_wc.vendor_err = 0; 2283 2284 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2285 &cancel_list, agent_list) { 2286 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2287 list_del(&mad_send_wr->agent_list); 2288 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2289 &mad_send_wc); 2290 atomic_dec(&mad_agent_priv->refcount); 2291 } 2292 } 2293 2294 static struct ib_mad_send_wr_private* 2295 find_send_wr(struct ib_mad_agent_private *mad_agent_priv, 2296 struct ib_mad_send_buf *send_buf) 2297 { 2298 struct ib_mad_send_wr_private *mad_send_wr; 2299 2300 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list, 2301 agent_list) { 2302 if (&mad_send_wr->send_buf == send_buf) 2303 return mad_send_wr; 2304 } 2305 2306 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list, 2307 agent_list) { 2308 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) && 2309 &mad_send_wr->send_buf == send_buf) 2310 return mad_send_wr; 2311 } 2312 return NULL; 2313 } 2314 2315 int ib_modify_mad(struct ib_mad_agent *mad_agent, 2316 struct ib_mad_send_buf *send_buf, u32 timeout_ms) 2317 { 2318 struct ib_mad_agent_private *mad_agent_priv; 2319 struct ib_mad_send_wr_private *mad_send_wr; 2320 unsigned long flags; 2321 int active; 2322 2323 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, 2324 agent); 2325 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2326 mad_send_wr = find_send_wr(mad_agent_priv, send_buf); 2327 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) { 2328 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2329 return -EINVAL; 2330 } 2331 2332 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1); 2333 if (!timeout_ms) { 2334 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2335 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2336 } 2337 2338 mad_send_wr->send_buf.timeout_ms = timeout_ms; 2339 if (active) 2340 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2341 else 2342 ib_reset_mad_timeout(mad_send_wr, timeout_ms); 2343 2344 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2345 return 0; 2346 } 2347 EXPORT_SYMBOL(ib_modify_mad); 2348 2349 void ib_cancel_mad(struct ib_mad_agent *mad_agent, 2350 struct ib_mad_send_buf *send_buf) 2351 { 2352 ib_modify_mad(mad_agent, send_buf, 0); 2353 } 2354 EXPORT_SYMBOL(ib_cancel_mad); 2355 2356 static void local_completions(struct work_struct *work) 2357 { 2358 struct ib_mad_agent_private *mad_agent_priv; 2359 struct ib_mad_local_private *local; 2360 struct ib_mad_agent_private *recv_mad_agent; 2361 unsigned long flags; 2362 int recv = 0; 2363 struct ib_wc wc; 2364 struct ib_mad_send_wc mad_send_wc; 2365 2366 mad_agent_priv = 2367 container_of(work, struct ib_mad_agent_private, local_work); 2368 2369 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2370 while (!list_empty(&mad_agent_priv->local_list)) { 2371 local = list_entry(mad_agent_priv->local_list.next, 2372 struct ib_mad_local_private, 2373 completion_list); 2374 list_del(&local->completion_list); 2375 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2376 if (local->mad_priv) { 2377 recv_mad_agent = local->recv_mad_agent; 2378 if (!recv_mad_agent) { 2379 printk(KERN_ERR PFX "No receive MAD agent for local completion\n"); 2380 goto local_send_completion; 2381 } 2382 2383 recv = 1; 2384 /* 2385 * Defined behavior is to complete response 2386 * before request 2387 */ 2388 build_smp_wc(recv_mad_agent->agent.qp, 2389 (unsigned long) local->mad_send_wr, 2390 be16_to_cpu(IB_LID_PERMISSIVE), 2391 0, recv_mad_agent->agent.port_num, &wc); 2392 2393 local->mad_priv->header.recv_wc.wc = &wc; 2394 local->mad_priv->header.recv_wc.mad_len = 2395 sizeof(struct ib_mad); 2396 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list); 2397 list_add(&local->mad_priv->header.recv_wc.recv_buf.list, 2398 &local->mad_priv->header.recv_wc.rmpp_list); 2399 local->mad_priv->header.recv_wc.recv_buf.grh = NULL; 2400 local->mad_priv->header.recv_wc.recv_buf.mad = 2401 &local->mad_priv->mad.mad; 2402 if (atomic_read(&recv_mad_agent->qp_info->snoop_count)) 2403 snoop_recv(recv_mad_agent->qp_info, 2404 &local->mad_priv->header.recv_wc, 2405 IB_MAD_SNOOP_RECVS); 2406 recv_mad_agent->agent.recv_handler( 2407 &recv_mad_agent->agent, 2408 &local->mad_priv->header.recv_wc); 2409 spin_lock_irqsave(&recv_mad_agent->lock, flags); 2410 atomic_dec(&recv_mad_agent->refcount); 2411 spin_unlock_irqrestore(&recv_mad_agent->lock, flags); 2412 } 2413 2414 local_send_completion: 2415 /* Complete send */ 2416 mad_send_wc.status = IB_WC_SUCCESS; 2417 mad_send_wc.vendor_err = 0; 2418 mad_send_wc.send_buf = &local->mad_send_wr->send_buf; 2419 if (atomic_read(&mad_agent_priv->qp_info->snoop_count)) 2420 snoop_send(mad_agent_priv->qp_info, 2421 &local->mad_send_wr->send_buf, 2422 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS); 2423 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2424 &mad_send_wc); 2425 2426 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2427 atomic_dec(&mad_agent_priv->refcount); 2428 if (!recv) 2429 kmem_cache_free(ib_mad_cache, local->mad_priv); 2430 kfree(local); 2431 } 2432 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2433 } 2434 2435 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr) 2436 { 2437 int ret; 2438 2439 if (!mad_send_wr->retries_left) 2440 return -ETIMEDOUT; 2441 2442 mad_send_wr->retries_left--; 2443 mad_send_wr->send_buf.retries++; 2444 2445 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms); 2446 2447 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) { 2448 ret = ib_retry_rmpp(mad_send_wr); 2449 switch (ret) { 2450 case IB_RMPP_RESULT_UNHANDLED: 2451 ret = ib_send_mad(mad_send_wr); 2452 break; 2453 case IB_RMPP_RESULT_CONSUMED: 2454 ret = 0; 2455 break; 2456 default: 2457 ret = -ECOMM; 2458 break; 2459 } 2460 } else 2461 ret = ib_send_mad(mad_send_wr); 2462 2463 if (!ret) { 2464 mad_send_wr->refcount++; 2465 list_add_tail(&mad_send_wr->agent_list, 2466 &mad_send_wr->mad_agent_priv->send_list); 2467 } 2468 return ret; 2469 } 2470 2471 static void timeout_sends(struct work_struct *work) 2472 { 2473 struct ib_mad_agent_private *mad_agent_priv; 2474 struct ib_mad_send_wr_private *mad_send_wr; 2475 struct ib_mad_send_wc mad_send_wc; 2476 unsigned long flags, delay; 2477 2478 mad_agent_priv = container_of(work, struct ib_mad_agent_private, 2479 timed_work.work); 2480 mad_send_wc.vendor_err = 0; 2481 2482 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2483 while (!list_empty(&mad_agent_priv->wait_list)) { 2484 mad_send_wr = list_entry(mad_agent_priv->wait_list.next, 2485 struct ib_mad_send_wr_private, 2486 agent_list); 2487 2488 if (time_after(mad_send_wr->timeout, jiffies)) { 2489 delay = mad_send_wr->timeout - jiffies; 2490 if ((long)delay <= 0) 2491 delay = 1; 2492 queue_delayed_work(mad_agent_priv->qp_info-> 2493 port_priv->wq, 2494 &mad_agent_priv->timed_work, delay); 2495 break; 2496 } 2497 2498 list_del(&mad_send_wr->agent_list); 2499 if (mad_send_wr->status == IB_WC_SUCCESS && 2500 !retry_send(mad_send_wr)) 2501 continue; 2502 2503 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2504 2505 if (mad_send_wr->status == IB_WC_SUCCESS) 2506 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR; 2507 else 2508 mad_send_wc.status = mad_send_wr->status; 2509 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2510 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2511 &mad_send_wc); 2512 2513 atomic_dec(&mad_agent_priv->refcount); 2514 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2515 } 2516 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2517 } 2518 2519 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg) 2520 { 2521 struct ib_mad_port_private *port_priv = cq->cq_context; 2522 unsigned long flags; 2523 2524 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2525 if (!list_empty(&port_priv->port_list)) 2526 queue_work(port_priv->wq, &port_priv->work); 2527 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2528 } 2529 2530 /* 2531 * Allocate receive MADs and post receive WRs for them 2532 */ 2533 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info, 2534 struct ib_mad_private *mad) 2535 { 2536 unsigned long flags; 2537 int post, ret; 2538 struct ib_mad_private *mad_priv; 2539 struct ib_sge sg_list; 2540 struct ib_recv_wr recv_wr, *bad_recv_wr; 2541 struct ib_mad_queue *recv_queue = &qp_info->recv_queue; 2542 2543 /* Initialize common scatter list fields */ 2544 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header; 2545 sg_list.lkey = (*qp_info->port_priv->mr).lkey; 2546 2547 /* Initialize common receive WR fields */ 2548 recv_wr.next = NULL; 2549 recv_wr.sg_list = &sg_list; 2550 recv_wr.num_sge = 1; 2551 2552 do { 2553 /* Allocate and map receive buffer */ 2554 if (mad) { 2555 mad_priv = mad; 2556 mad = NULL; 2557 } else { 2558 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL); 2559 if (!mad_priv) { 2560 printk(KERN_ERR PFX "No memory for receive buffer\n"); 2561 ret = -ENOMEM; 2562 break; 2563 } 2564 } 2565 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device, 2566 &mad_priv->grh, 2567 sizeof *mad_priv - 2568 sizeof mad_priv->header, 2569 DMA_FROM_DEVICE); 2570 mad_priv->header.mapping = sg_list.addr; 2571 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list; 2572 mad_priv->header.mad_list.mad_queue = recv_queue; 2573 2574 /* Post receive WR */ 2575 spin_lock_irqsave(&recv_queue->lock, flags); 2576 post = (++recv_queue->count < recv_queue->max_active); 2577 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list); 2578 spin_unlock_irqrestore(&recv_queue->lock, flags); 2579 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr); 2580 if (ret) { 2581 spin_lock_irqsave(&recv_queue->lock, flags); 2582 list_del(&mad_priv->header.mad_list.list); 2583 recv_queue->count--; 2584 spin_unlock_irqrestore(&recv_queue->lock, flags); 2585 ib_dma_unmap_single(qp_info->port_priv->device, 2586 mad_priv->header.mapping, 2587 sizeof *mad_priv - 2588 sizeof mad_priv->header, 2589 DMA_FROM_DEVICE); 2590 kmem_cache_free(ib_mad_cache, mad_priv); 2591 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret); 2592 break; 2593 } 2594 } while (post); 2595 2596 return ret; 2597 } 2598 2599 /* 2600 * Return all the posted receive MADs 2601 */ 2602 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info) 2603 { 2604 struct ib_mad_private_header *mad_priv_hdr; 2605 struct ib_mad_private *recv; 2606 struct ib_mad_list_head *mad_list; 2607 2608 while (!list_empty(&qp_info->recv_queue.list)) { 2609 2610 mad_list = list_entry(qp_info->recv_queue.list.next, 2611 struct ib_mad_list_head, list); 2612 mad_priv_hdr = container_of(mad_list, 2613 struct ib_mad_private_header, 2614 mad_list); 2615 recv = container_of(mad_priv_hdr, struct ib_mad_private, 2616 header); 2617 2618 /* Remove from posted receive MAD list */ 2619 list_del(&mad_list->list); 2620 2621 ib_dma_unmap_single(qp_info->port_priv->device, 2622 recv->header.mapping, 2623 sizeof(struct ib_mad_private) - 2624 sizeof(struct ib_mad_private_header), 2625 DMA_FROM_DEVICE); 2626 kmem_cache_free(ib_mad_cache, recv); 2627 } 2628 2629 qp_info->recv_queue.count = 0; 2630 } 2631 2632 /* 2633 * Start the port 2634 */ 2635 static int ib_mad_port_start(struct ib_mad_port_private *port_priv) 2636 { 2637 int ret, i; 2638 struct ib_qp_attr *attr; 2639 struct ib_qp *qp; 2640 2641 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2642 if (!attr) { 2643 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n"); 2644 return -ENOMEM; 2645 } 2646 2647 for (i = 0; i < IB_MAD_QPS_CORE; i++) { 2648 qp = port_priv->qp_info[i].qp; 2649 /* 2650 * PKey index for QP1 is irrelevant but 2651 * one is needed for the Reset to Init transition 2652 */ 2653 attr->qp_state = IB_QPS_INIT; 2654 attr->pkey_index = 0; 2655 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY; 2656 ret = ib_modify_qp(qp, attr, IB_QP_STATE | 2657 IB_QP_PKEY_INDEX | IB_QP_QKEY); 2658 if (ret) { 2659 printk(KERN_ERR PFX "Couldn't change QP%d state to " 2660 "INIT: %d\n", i, ret); 2661 goto out; 2662 } 2663 2664 attr->qp_state = IB_QPS_RTR; 2665 ret = ib_modify_qp(qp, attr, IB_QP_STATE); 2666 if (ret) { 2667 printk(KERN_ERR PFX "Couldn't change QP%d state to " 2668 "RTR: %d\n", i, ret); 2669 goto out; 2670 } 2671 2672 attr->qp_state = IB_QPS_RTS; 2673 attr->sq_psn = IB_MAD_SEND_Q_PSN; 2674 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN); 2675 if (ret) { 2676 printk(KERN_ERR PFX "Couldn't change QP%d state to " 2677 "RTS: %d\n", i, ret); 2678 goto out; 2679 } 2680 } 2681 2682 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); 2683 if (ret) { 2684 printk(KERN_ERR PFX "Failed to request completion " 2685 "notification: %d\n", ret); 2686 goto out; 2687 } 2688 2689 for (i = 0; i < IB_MAD_QPS_CORE; i++) { 2690 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL); 2691 if (ret) { 2692 printk(KERN_ERR PFX "Couldn't post receive WRs\n"); 2693 goto out; 2694 } 2695 } 2696 out: 2697 kfree(attr); 2698 return ret; 2699 } 2700 2701 static void qp_event_handler(struct ib_event *event, void *qp_context) 2702 { 2703 struct ib_mad_qp_info *qp_info = qp_context; 2704 2705 /* It's worse than that! He's dead, Jim! */ 2706 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n", 2707 event->event, qp_info->qp->qp_num); 2708 } 2709 2710 static void init_mad_queue(struct ib_mad_qp_info *qp_info, 2711 struct ib_mad_queue *mad_queue) 2712 { 2713 mad_queue->qp_info = qp_info; 2714 mad_queue->count = 0; 2715 spin_lock_init(&mad_queue->lock); 2716 INIT_LIST_HEAD(&mad_queue->list); 2717 } 2718 2719 static void init_mad_qp(struct ib_mad_port_private *port_priv, 2720 struct ib_mad_qp_info *qp_info) 2721 { 2722 qp_info->port_priv = port_priv; 2723 init_mad_queue(qp_info, &qp_info->send_queue); 2724 init_mad_queue(qp_info, &qp_info->recv_queue); 2725 INIT_LIST_HEAD(&qp_info->overflow_list); 2726 spin_lock_init(&qp_info->snoop_lock); 2727 qp_info->snoop_table = NULL; 2728 qp_info->snoop_table_size = 0; 2729 atomic_set(&qp_info->snoop_count, 0); 2730 } 2731 2732 static int create_mad_qp(struct ib_mad_qp_info *qp_info, 2733 enum ib_qp_type qp_type) 2734 { 2735 struct ib_qp_init_attr qp_init_attr; 2736 int ret; 2737 2738 memset(&qp_init_attr, 0, sizeof qp_init_attr); 2739 qp_init_attr.send_cq = qp_info->port_priv->cq; 2740 qp_init_attr.recv_cq = qp_info->port_priv->cq; 2741 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR; 2742 qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE; 2743 qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE; 2744 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG; 2745 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG; 2746 qp_init_attr.qp_type = qp_type; 2747 qp_init_attr.port_num = qp_info->port_priv->port_num; 2748 qp_init_attr.qp_context = qp_info; 2749 qp_init_attr.event_handler = qp_event_handler; 2750 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr); 2751 if (IS_ERR(qp_info->qp)) { 2752 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n", 2753 get_spl_qp_index(qp_type)); 2754 ret = PTR_ERR(qp_info->qp); 2755 goto error; 2756 } 2757 /* Use minimum queue sizes unless the CQ is resized */ 2758 qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE; 2759 qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE; 2760 return 0; 2761 2762 error: 2763 return ret; 2764 } 2765 2766 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info) 2767 { 2768 ib_destroy_qp(qp_info->qp); 2769 kfree(qp_info->snoop_table); 2770 } 2771 2772 /* 2773 * Open the port 2774 * Create the QP, PD, MR, and CQ if needed 2775 */ 2776 static int ib_mad_port_open(struct ib_device *device, 2777 int port_num) 2778 { 2779 int ret, cq_size; 2780 struct ib_mad_port_private *port_priv; 2781 unsigned long flags; 2782 char name[sizeof "ib_mad123"]; 2783 2784 /* Create new device info */ 2785 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL); 2786 if (!port_priv) { 2787 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n"); 2788 return -ENOMEM; 2789 } 2790 2791 port_priv->device = device; 2792 port_priv->port_num = port_num; 2793 spin_lock_init(&port_priv->reg_lock); 2794 INIT_LIST_HEAD(&port_priv->agent_list); 2795 init_mad_qp(port_priv, &port_priv->qp_info[0]); 2796 init_mad_qp(port_priv, &port_priv->qp_info[1]); 2797 2798 cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2; 2799 port_priv->cq = ib_create_cq(port_priv->device, 2800 ib_mad_thread_completion_handler, 2801 NULL, port_priv, cq_size, 0); 2802 if (IS_ERR(port_priv->cq)) { 2803 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n"); 2804 ret = PTR_ERR(port_priv->cq); 2805 goto error3; 2806 } 2807 2808 port_priv->pd = ib_alloc_pd(device); 2809 if (IS_ERR(port_priv->pd)) { 2810 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n"); 2811 ret = PTR_ERR(port_priv->pd); 2812 goto error4; 2813 } 2814 2815 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE); 2816 if (IS_ERR(port_priv->mr)) { 2817 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n"); 2818 ret = PTR_ERR(port_priv->mr); 2819 goto error5; 2820 } 2821 2822 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI); 2823 if (ret) 2824 goto error6; 2825 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI); 2826 if (ret) 2827 goto error7; 2828 2829 snprintf(name, sizeof name, "ib_mad%d", port_num); 2830 port_priv->wq = create_singlethread_workqueue(name); 2831 if (!port_priv->wq) { 2832 ret = -ENOMEM; 2833 goto error8; 2834 } 2835 INIT_WORK(&port_priv->work, ib_mad_completion_handler); 2836 2837 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2838 list_add_tail(&port_priv->port_list, &ib_mad_port_list); 2839 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2840 2841 ret = ib_mad_port_start(port_priv); 2842 if (ret) { 2843 printk(KERN_ERR PFX "Couldn't start port\n"); 2844 goto error9; 2845 } 2846 2847 return 0; 2848 2849 error9: 2850 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2851 list_del_init(&port_priv->port_list); 2852 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2853 2854 destroy_workqueue(port_priv->wq); 2855 error8: 2856 destroy_mad_qp(&port_priv->qp_info[1]); 2857 error7: 2858 destroy_mad_qp(&port_priv->qp_info[0]); 2859 error6: 2860 ib_dereg_mr(port_priv->mr); 2861 error5: 2862 ib_dealloc_pd(port_priv->pd); 2863 error4: 2864 ib_destroy_cq(port_priv->cq); 2865 cleanup_recv_queue(&port_priv->qp_info[1]); 2866 cleanup_recv_queue(&port_priv->qp_info[0]); 2867 error3: 2868 kfree(port_priv); 2869 2870 return ret; 2871 } 2872 2873 /* 2874 * Close the port 2875 * If there are no classes using the port, free the port 2876 * resources (CQ, MR, PD, QP) and remove the port's info structure 2877 */ 2878 static int ib_mad_port_close(struct ib_device *device, int port_num) 2879 { 2880 struct ib_mad_port_private *port_priv; 2881 unsigned long flags; 2882 2883 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2884 port_priv = __ib_get_mad_port(device, port_num); 2885 if (port_priv == NULL) { 2886 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2887 printk(KERN_ERR PFX "Port %d not found\n", port_num); 2888 return -ENODEV; 2889 } 2890 list_del_init(&port_priv->port_list); 2891 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2892 2893 destroy_workqueue(port_priv->wq); 2894 destroy_mad_qp(&port_priv->qp_info[1]); 2895 destroy_mad_qp(&port_priv->qp_info[0]); 2896 ib_dereg_mr(port_priv->mr); 2897 ib_dealloc_pd(port_priv->pd); 2898 ib_destroy_cq(port_priv->cq); 2899 cleanup_recv_queue(&port_priv->qp_info[1]); 2900 cleanup_recv_queue(&port_priv->qp_info[0]); 2901 /* XXX: Handle deallocation of MAD registration tables */ 2902 2903 kfree(port_priv); 2904 2905 return 0; 2906 } 2907 2908 static void ib_mad_init_device(struct ib_device *device) 2909 { 2910 int start, end, i; 2911 2912 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 2913 return; 2914 2915 if (device->node_type == RDMA_NODE_IB_SWITCH) { 2916 start = 0; 2917 end = 0; 2918 } else { 2919 start = 1; 2920 end = device->phys_port_cnt; 2921 } 2922 2923 for (i = start; i <= end; i++) { 2924 if (ib_mad_port_open(device, i)) { 2925 printk(KERN_ERR PFX "Couldn't open %s port %d\n", 2926 device->name, i); 2927 goto error; 2928 } 2929 if (ib_agent_port_open(device, i)) { 2930 printk(KERN_ERR PFX "Couldn't open %s port %d " 2931 "for agents\n", 2932 device->name, i); 2933 goto error_agent; 2934 } 2935 } 2936 return; 2937 2938 error_agent: 2939 if (ib_mad_port_close(device, i)) 2940 printk(KERN_ERR PFX "Couldn't close %s port %d\n", 2941 device->name, i); 2942 2943 error: 2944 i--; 2945 2946 while (i >= start) { 2947 if (ib_agent_port_close(device, i)) 2948 printk(KERN_ERR PFX "Couldn't close %s port %d " 2949 "for agents\n", 2950 device->name, i); 2951 if (ib_mad_port_close(device, i)) 2952 printk(KERN_ERR PFX "Couldn't close %s port %d\n", 2953 device->name, i); 2954 i--; 2955 } 2956 } 2957 2958 static void ib_mad_remove_device(struct ib_device *device) 2959 { 2960 int i, num_ports, cur_port; 2961 2962 if (device->node_type == RDMA_NODE_IB_SWITCH) { 2963 num_ports = 1; 2964 cur_port = 0; 2965 } else { 2966 num_ports = device->phys_port_cnt; 2967 cur_port = 1; 2968 } 2969 for (i = 0; i < num_ports; i++, cur_port++) { 2970 if (ib_agent_port_close(device, cur_port)) 2971 printk(KERN_ERR PFX "Couldn't close %s port %d " 2972 "for agents\n", 2973 device->name, cur_port); 2974 if (ib_mad_port_close(device, cur_port)) 2975 printk(KERN_ERR PFX "Couldn't close %s port %d\n", 2976 device->name, cur_port); 2977 } 2978 } 2979 2980 static struct ib_client mad_client = { 2981 .name = "mad", 2982 .add = ib_mad_init_device, 2983 .remove = ib_mad_remove_device 2984 }; 2985 2986 static int __init ib_mad_init_module(void) 2987 { 2988 int ret; 2989 2990 spin_lock_init(&ib_mad_port_list_lock); 2991 2992 ib_mad_cache = kmem_cache_create("ib_mad", 2993 sizeof(struct ib_mad_private), 2994 0, 2995 SLAB_HWCACHE_ALIGN, 2996 NULL); 2997 if (!ib_mad_cache) { 2998 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n"); 2999 ret = -ENOMEM; 3000 goto error1; 3001 } 3002 3003 INIT_LIST_HEAD(&ib_mad_port_list); 3004 3005 if (ib_register_client(&mad_client)) { 3006 printk(KERN_ERR PFX "Couldn't register ib_mad client\n"); 3007 ret = -EINVAL; 3008 goto error2; 3009 } 3010 3011 return 0; 3012 3013 error2: 3014 kmem_cache_destroy(ib_mad_cache); 3015 error1: 3016 return ret; 3017 } 3018 3019 static void __exit ib_mad_cleanup_module(void) 3020 { 3021 ib_unregister_client(&mad_client); 3022 kmem_cache_destroy(ib_mad_cache); 3023 } 3024 3025 module_init(ib_mad_init_module); 3026 module_exit(ib_mad_cleanup_module); 3027 3028