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 * Copyright (c) 2009 HNR Consulting. All rights reserved. 6 * 7 * This software is available to you under a choice of one of two 8 * licenses. You may choose to be licensed under the terms of the GNU 9 * General Public License (GPL) Version 2, available from the file 10 * COPYING in the main directory of this source tree, or the 11 * OpenIB.org BSD license below: 12 * 13 * Redistribution and use in source and binary forms, with or 14 * without modification, are permitted provided that the following 15 * conditions are met: 16 * 17 * - Redistributions of source code must retain the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer. 20 * 21 * - Redistributions in binary form must reproduce the above 22 * copyright notice, this list of conditions and the following 23 * disclaimer in the documentation and/or other materials 24 * provided with the distribution. 25 * 26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 33 * SOFTWARE. 34 * 35 */ 36 #include <linux/dma-mapping.h> 37 #include <linux/slab.h> 38 #include <rdma/ib_cache.h> 39 40 #include "mad_priv.h" 41 #include "mad_rmpp.h" 42 #include "smi.h" 43 #include "agent.h" 44 45 MODULE_LICENSE("Dual BSD/GPL"); 46 MODULE_DESCRIPTION("kernel IB MAD API"); 47 MODULE_AUTHOR("Hal Rosenstock"); 48 MODULE_AUTHOR("Sean Hefty"); 49 50 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE; 51 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE; 52 53 module_param_named(send_queue_size, mad_sendq_size, int, 0444); 54 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests"); 55 module_param_named(recv_queue_size, mad_recvq_size, int, 0444); 56 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests"); 57 58 static struct kmem_cache *ib_mad_cache; 59 60 static struct list_head ib_mad_port_list; 61 static u32 ib_mad_client_id = 0; 62 63 /* Port list lock */ 64 static DEFINE_SPINLOCK(ib_mad_port_list_lock); 65 66 /* Forward declarations */ 67 static int method_in_use(struct ib_mad_mgmt_method_table **method, 68 struct ib_mad_reg_req *mad_reg_req); 69 static void remove_mad_reg_req(struct ib_mad_agent_private *priv); 70 static struct ib_mad_agent_private *find_mad_agent( 71 struct ib_mad_port_private *port_priv, 72 struct ib_mad *mad); 73 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info, 74 struct ib_mad_private *mad); 75 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv); 76 static void timeout_sends(struct work_struct *work); 77 static void local_completions(struct work_struct *work); 78 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req, 79 struct ib_mad_agent_private *agent_priv, 80 u8 mgmt_class); 81 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req, 82 struct ib_mad_agent_private *agent_priv); 83 84 /* 85 * Returns a ib_mad_port_private structure or NULL for a device/port 86 * Assumes ib_mad_port_list_lock is being held 87 */ 88 static inline struct ib_mad_port_private * 89 __ib_get_mad_port(struct ib_device *device, int port_num) 90 { 91 struct ib_mad_port_private *entry; 92 93 list_for_each_entry(entry, &ib_mad_port_list, port_list) { 94 if (entry->device == device && entry->port_num == port_num) 95 return entry; 96 } 97 return NULL; 98 } 99 100 /* 101 * Wrapper function to return a ib_mad_port_private structure or NULL 102 * for a device/port 103 */ 104 static inline struct ib_mad_port_private * 105 ib_get_mad_port(struct ib_device *device, int port_num) 106 { 107 struct ib_mad_port_private *entry; 108 unsigned long flags; 109 110 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 111 entry = __ib_get_mad_port(device, port_num); 112 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 113 114 return entry; 115 } 116 117 static inline u8 convert_mgmt_class(u8 mgmt_class) 118 { 119 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */ 120 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ? 121 0 : mgmt_class; 122 } 123 124 static int get_spl_qp_index(enum ib_qp_type qp_type) 125 { 126 switch (qp_type) 127 { 128 case IB_QPT_SMI: 129 return 0; 130 case IB_QPT_GSI: 131 return 1; 132 default: 133 return -1; 134 } 135 } 136 137 static int vendor_class_index(u8 mgmt_class) 138 { 139 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START; 140 } 141 142 static int is_vendor_class(u8 mgmt_class) 143 { 144 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) || 145 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END)) 146 return 0; 147 return 1; 148 } 149 150 static int is_vendor_oui(char *oui) 151 { 152 if (oui[0] || oui[1] || oui[2]) 153 return 1; 154 return 0; 155 } 156 157 static int is_vendor_method_in_use( 158 struct ib_mad_mgmt_vendor_class *vendor_class, 159 struct ib_mad_reg_req *mad_reg_req) 160 { 161 struct ib_mad_mgmt_method_table *method; 162 int i; 163 164 for (i = 0; i < MAX_MGMT_OUI; i++) { 165 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) { 166 method = vendor_class->method_table[i]; 167 if (method) { 168 if (method_in_use(&method, mad_reg_req)) 169 return 1; 170 else 171 break; 172 } 173 } 174 } 175 return 0; 176 } 177 178 int ib_response_mad(struct ib_mad *mad) 179 { 180 return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) || 181 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) || 182 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) && 183 (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP))); 184 } 185 EXPORT_SYMBOL(ib_response_mad); 186 187 /* 188 * ib_register_mad_agent - Register to send/receive MADs 189 */ 190 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device, 191 u8 port_num, 192 enum ib_qp_type qp_type, 193 struct ib_mad_reg_req *mad_reg_req, 194 u8 rmpp_version, 195 ib_mad_send_handler send_handler, 196 ib_mad_recv_handler recv_handler, 197 void *context) 198 { 199 struct ib_mad_port_private *port_priv; 200 struct ib_mad_agent *ret = ERR_PTR(-EINVAL); 201 struct ib_mad_agent_private *mad_agent_priv; 202 struct ib_mad_reg_req *reg_req = NULL; 203 struct ib_mad_mgmt_class_table *class; 204 struct ib_mad_mgmt_vendor_class_table *vendor; 205 struct ib_mad_mgmt_vendor_class *vendor_class; 206 struct ib_mad_mgmt_method_table *method; 207 int ret2, qpn; 208 unsigned long flags; 209 u8 mgmt_class, vclass; 210 211 /* Validate parameters */ 212 qpn = get_spl_qp_index(qp_type); 213 if (qpn == -1) 214 goto error1; 215 216 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) 217 goto error1; 218 219 /* Validate MAD registration request if supplied */ 220 if (mad_reg_req) { 221 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) 222 goto error1; 223 if (!recv_handler) 224 goto error1; 225 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) { 226 /* 227 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only 228 * one in this range currently allowed 229 */ 230 if (mad_reg_req->mgmt_class != 231 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 232 goto error1; 233 } else if (mad_reg_req->mgmt_class == 0) { 234 /* 235 * Class 0 is reserved in IBA and is used for 236 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE 237 */ 238 goto error1; 239 } else if (is_vendor_class(mad_reg_req->mgmt_class)) { 240 /* 241 * If class is in "new" vendor range, 242 * ensure supplied OUI is not zero 243 */ 244 if (!is_vendor_oui(mad_reg_req->oui)) 245 goto error1; 246 } 247 /* Make sure class supplied is consistent with RMPP */ 248 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) { 249 if (rmpp_version) 250 goto error1; 251 } 252 /* Make sure class supplied is consistent with QP type */ 253 if (qp_type == IB_QPT_SMI) { 254 if ((mad_reg_req->mgmt_class != 255 IB_MGMT_CLASS_SUBN_LID_ROUTED) && 256 (mad_reg_req->mgmt_class != 257 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) 258 goto error1; 259 } else { 260 if ((mad_reg_req->mgmt_class == 261 IB_MGMT_CLASS_SUBN_LID_ROUTED) || 262 (mad_reg_req->mgmt_class == 263 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) 264 goto error1; 265 } 266 } else { 267 /* No registration request supplied */ 268 if (!send_handler) 269 goto error1; 270 } 271 272 /* Validate device and port */ 273 port_priv = ib_get_mad_port(device, port_num); 274 if (!port_priv) { 275 ret = ERR_PTR(-ENODEV); 276 goto error1; 277 } 278 279 /* Verify the QP requested is supported. For example, Ethernet devices 280 * will not have QP0 */ 281 if (!port_priv->qp_info[qpn].qp) { 282 ret = ERR_PTR(-EPROTONOSUPPORT); 283 goto error1; 284 } 285 286 /* Allocate structures */ 287 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL); 288 if (!mad_agent_priv) { 289 ret = ERR_PTR(-ENOMEM); 290 goto error1; 291 } 292 293 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd, 294 IB_ACCESS_LOCAL_WRITE); 295 if (IS_ERR(mad_agent_priv->agent.mr)) { 296 ret = ERR_PTR(-ENOMEM); 297 goto error2; 298 } 299 300 if (mad_reg_req) { 301 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL); 302 if (!reg_req) { 303 ret = ERR_PTR(-ENOMEM); 304 goto error3; 305 } 306 } 307 308 /* Now, fill in the various structures */ 309 mad_agent_priv->qp_info = &port_priv->qp_info[qpn]; 310 mad_agent_priv->reg_req = reg_req; 311 mad_agent_priv->agent.rmpp_version = rmpp_version; 312 mad_agent_priv->agent.device = device; 313 mad_agent_priv->agent.recv_handler = recv_handler; 314 mad_agent_priv->agent.send_handler = send_handler; 315 mad_agent_priv->agent.context = context; 316 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp; 317 mad_agent_priv->agent.port_num = port_num; 318 spin_lock_init(&mad_agent_priv->lock); 319 INIT_LIST_HEAD(&mad_agent_priv->send_list); 320 INIT_LIST_HEAD(&mad_agent_priv->wait_list); 321 INIT_LIST_HEAD(&mad_agent_priv->done_list); 322 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list); 323 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends); 324 INIT_LIST_HEAD(&mad_agent_priv->local_list); 325 INIT_WORK(&mad_agent_priv->local_work, local_completions); 326 atomic_set(&mad_agent_priv->refcount, 1); 327 init_completion(&mad_agent_priv->comp); 328 329 spin_lock_irqsave(&port_priv->reg_lock, flags); 330 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id; 331 332 /* 333 * Make sure MAD registration (if supplied) 334 * is non overlapping with any existing ones 335 */ 336 if (mad_reg_req) { 337 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class); 338 if (!is_vendor_class(mgmt_class)) { 339 class = port_priv->version[mad_reg_req-> 340 mgmt_class_version].class; 341 if (class) { 342 method = class->method_table[mgmt_class]; 343 if (method) { 344 if (method_in_use(&method, 345 mad_reg_req)) 346 goto error4; 347 } 348 } 349 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv, 350 mgmt_class); 351 } else { 352 /* "New" vendor class range */ 353 vendor = port_priv->version[mad_reg_req-> 354 mgmt_class_version].vendor; 355 if (vendor) { 356 vclass = vendor_class_index(mgmt_class); 357 vendor_class = vendor->vendor_class[vclass]; 358 if (vendor_class) { 359 if (is_vendor_method_in_use( 360 vendor_class, 361 mad_reg_req)) 362 goto error4; 363 } 364 } 365 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv); 366 } 367 if (ret2) { 368 ret = ERR_PTR(ret2); 369 goto error4; 370 } 371 } 372 373 /* Add mad agent into port's agent list */ 374 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list); 375 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 376 377 return &mad_agent_priv->agent; 378 379 error4: 380 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 381 kfree(reg_req); 382 error3: 383 ib_dereg_mr(mad_agent_priv->agent.mr); 384 error2: 385 kfree(mad_agent_priv); 386 error1: 387 return ret; 388 } 389 EXPORT_SYMBOL(ib_register_mad_agent); 390 391 static inline int is_snooping_sends(int mad_snoop_flags) 392 { 393 return (mad_snoop_flags & 394 (/*IB_MAD_SNOOP_POSTED_SENDS | 395 IB_MAD_SNOOP_RMPP_SENDS |*/ 396 IB_MAD_SNOOP_SEND_COMPLETIONS /*| 397 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/)); 398 } 399 400 static inline int is_snooping_recvs(int mad_snoop_flags) 401 { 402 return (mad_snoop_flags & 403 (IB_MAD_SNOOP_RECVS /*| 404 IB_MAD_SNOOP_RMPP_RECVS*/)); 405 } 406 407 static int register_snoop_agent(struct ib_mad_qp_info *qp_info, 408 struct ib_mad_snoop_private *mad_snoop_priv) 409 { 410 struct ib_mad_snoop_private **new_snoop_table; 411 unsigned long flags; 412 int i; 413 414 spin_lock_irqsave(&qp_info->snoop_lock, flags); 415 /* Check for empty slot in array. */ 416 for (i = 0; i < qp_info->snoop_table_size; i++) 417 if (!qp_info->snoop_table[i]) 418 break; 419 420 if (i == qp_info->snoop_table_size) { 421 /* Grow table. */ 422 new_snoop_table = krealloc(qp_info->snoop_table, 423 sizeof mad_snoop_priv * 424 (qp_info->snoop_table_size + 1), 425 GFP_ATOMIC); 426 if (!new_snoop_table) { 427 i = -ENOMEM; 428 goto out; 429 } 430 431 qp_info->snoop_table = new_snoop_table; 432 qp_info->snoop_table_size++; 433 } 434 qp_info->snoop_table[i] = mad_snoop_priv; 435 atomic_inc(&qp_info->snoop_count); 436 out: 437 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 438 return i; 439 } 440 441 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device, 442 u8 port_num, 443 enum ib_qp_type qp_type, 444 int mad_snoop_flags, 445 ib_mad_snoop_handler snoop_handler, 446 ib_mad_recv_handler recv_handler, 447 void *context) 448 { 449 struct ib_mad_port_private *port_priv; 450 struct ib_mad_agent *ret; 451 struct ib_mad_snoop_private *mad_snoop_priv; 452 int qpn; 453 454 /* Validate parameters */ 455 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) || 456 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) { 457 ret = ERR_PTR(-EINVAL); 458 goto error1; 459 } 460 qpn = get_spl_qp_index(qp_type); 461 if (qpn == -1) { 462 ret = ERR_PTR(-EINVAL); 463 goto error1; 464 } 465 port_priv = ib_get_mad_port(device, port_num); 466 if (!port_priv) { 467 ret = ERR_PTR(-ENODEV); 468 goto error1; 469 } 470 /* Allocate structures */ 471 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL); 472 if (!mad_snoop_priv) { 473 ret = ERR_PTR(-ENOMEM); 474 goto error1; 475 } 476 477 /* Now, fill in the various structures */ 478 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn]; 479 mad_snoop_priv->agent.device = device; 480 mad_snoop_priv->agent.recv_handler = recv_handler; 481 mad_snoop_priv->agent.snoop_handler = snoop_handler; 482 mad_snoop_priv->agent.context = context; 483 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp; 484 mad_snoop_priv->agent.port_num = port_num; 485 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags; 486 init_completion(&mad_snoop_priv->comp); 487 mad_snoop_priv->snoop_index = register_snoop_agent( 488 &port_priv->qp_info[qpn], 489 mad_snoop_priv); 490 if (mad_snoop_priv->snoop_index < 0) { 491 ret = ERR_PTR(mad_snoop_priv->snoop_index); 492 goto error2; 493 } 494 495 atomic_set(&mad_snoop_priv->refcount, 1); 496 return &mad_snoop_priv->agent; 497 498 error2: 499 kfree(mad_snoop_priv); 500 error1: 501 return ret; 502 } 503 EXPORT_SYMBOL(ib_register_mad_snoop); 504 505 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv) 506 { 507 if (atomic_dec_and_test(&mad_agent_priv->refcount)) 508 complete(&mad_agent_priv->comp); 509 } 510 511 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv) 512 { 513 if (atomic_dec_and_test(&mad_snoop_priv->refcount)) 514 complete(&mad_snoop_priv->comp); 515 } 516 517 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv) 518 { 519 struct ib_mad_port_private *port_priv; 520 unsigned long flags; 521 522 /* Note that we could still be handling received MADs */ 523 524 /* 525 * Canceling all sends results in dropping received response 526 * MADs, preventing us from queuing additional work 527 */ 528 cancel_mads(mad_agent_priv); 529 port_priv = mad_agent_priv->qp_info->port_priv; 530 cancel_delayed_work(&mad_agent_priv->timed_work); 531 532 spin_lock_irqsave(&port_priv->reg_lock, flags); 533 remove_mad_reg_req(mad_agent_priv); 534 list_del(&mad_agent_priv->agent_list); 535 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 536 537 flush_workqueue(port_priv->wq); 538 ib_cancel_rmpp_recvs(mad_agent_priv); 539 540 deref_mad_agent(mad_agent_priv); 541 wait_for_completion(&mad_agent_priv->comp); 542 543 kfree(mad_agent_priv->reg_req); 544 ib_dereg_mr(mad_agent_priv->agent.mr); 545 kfree(mad_agent_priv); 546 } 547 548 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv) 549 { 550 struct ib_mad_qp_info *qp_info; 551 unsigned long flags; 552 553 qp_info = mad_snoop_priv->qp_info; 554 spin_lock_irqsave(&qp_info->snoop_lock, flags); 555 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL; 556 atomic_dec(&qp_info->snoop_count); 557 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 558 559 deref_snoop_agent(mad_snoop_priv); 560 wait_for_completion(&mad_snoop_priv->comp); 561 562 kfree(mad_snoop_priv); 563 } 564 565 /* 566 * ib_unregister_mad_agent - Unregisters a client from using MAD services 567 */ 568 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent) 569 { 570 struct ib_mad_agent_private *mad_agent_priv; 571 struct ib_mad_snoop_private *mad_snoop_priv; 572 573 /* If the TID is zero, the agent can only snoop. */ 574 if (mad_agent->hi_tid) { 575 mad_agent_priv = container_of(mad_agent, 576 struct ib_mad_agent_private, 577 agent); 578 unregister_mad_agent(mad_agent_priv); 579 } else { 580 mad_snoop_priv = container_of(mad_agent, 581 struct ib_mad_snoop_private, 582 agent); 583 unregister_mad_snoop(mad_snoop_priv); 584 } 585 return 0; 586 } 587 EXPORT_SYMBOL(ib_unregister_mad_agent); 588 589 static void dequeue_mad(struct ib_mad_list_head *mad_list) 590 { 591 struct ib_mad_queue *mad_queue; 592 unsigned long flags; 593 594 BUG_ON(!mad_list->mad_queue); 595 mad_queue = mad_list->mad_queue; 596 spin_lock_irqsave(&mad_queue->lock, flags); 597 list_del(&mad_list->list); 598 mad_queue->count--; 599 spin_unlock_irqrestore(&mad_queue->lock, flags); 600 } 601 602 static void snoop_send(struct ib_mad_qp_info *qp_info, 603 struct ib_mad_send_buf *send_buf, 604 struct ib_mad_send_wc *mad_send_wc, 605 int mad_snoop_flags) 606 { 607 struct ib_mad_snoop_private *mad_snoop_priv; 608 unsigned long flags; 609 int i; 610 611 spin_lock_irqsave(&qp_info->snoop_lock, flags); 612 for (i = 0; i < qp_info->snoop_table_size; i++) { 613 mad_snoop_priv = qp_info->snoop_table[i]; 614 if (!mad_snoop_priv || 615 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags)) 616 continue; 617 618 atomic_inc(&mad_snoop_priv->refcount); 619 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 620 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent, 621 send_buf, mad_send_wc); 622 deref_snoop_agent(mad_snoop_priv); 623 spin_lock_irqsave(&qp_info->snoop_lock, flags); 624 } 625 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 626 } 627 628 static void snoop_recv(struct ib_mad_qp_info *qp_info, 629 struct ib_mad_recv_wc *mad_recv_wc, 630 int mad_snoop_flags) 631 { 632 struct ib_mad_snoop_private *mad_snoop_priv; 633 unsigned long flags; 634 int i; 635 636 spin_lock_irqsave(&qp_info->snoop_lock, flags); 637 for (i = 0; i < qp_info->snoop_table_size; i++) { 638 mad_snoop_priv = qp_info->snoop_table[i]; 639 if (!mad_snoop_priv || 640 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags)) 641 continue; 642 643 atomic_inc(&mad_snoop_priv->refcount); 644 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 645 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent, 646 mad_recv_wc); 647 deref_snoop_agent(mad_snoop_priv); 648 spin_lock_irqsave(&qp_info->snoop_lock, flags); 649 } 650 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 651 } 652 653 static void build_smp_wc(struct ib_qp *qp, 654 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num, 655 struct ib_wc *wc) 656 { 657 memset(wc, 0, sizeof *wc); 658 wc->wr_id = wr_id; 659 wc->status = IB_WC_SUCCESS; 660 wc->opcode = IB_WC_RECV; 661 wc->pkey_index = pkey_index; 662 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh); 663 wc->src_qp = IB_QP0; 664 wc->qp = qp; 665 wc->slid = slid; 666 wc->sl = 0; 667 wc->dlid_path_bits = 0; 668 wc->port_num = port_num; 669 } 670 671 /* 672 * Return 0 if SMP is to be sent 673 * Return 1 if SMP was consumed locally (whether or not solicited) 674 * Return < 0 if error 675 */ 676 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv, 677 struct ib_mad_send_wr_private *mad_send_wr) 678 { 679 int ret = 0; 680 struct ib_smp *smp = mad_send_wr->send_buf.mad; 681 unsigned long flags; 682 struct ib_mad_local_private *local; 683 struct ib_mad_private *mad_priv; 684 struct ib_mad_port_private *port_priv; 685 struct ib_mad_agent_private *recv_mad_agent = NULL; 686 struct ib_device *device = mad_agent_priv->agent.device; 687 u8 port_num; 688 struct ib_wc mad_wc; 689 struct ib_send_wr *send_wr = &mad_send_wr->send_wr; 690 691 if (device->node_type == RDMA_NODE_IB_SWITCH && 692 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 693 port_num = send_wr->wr.ud.port_num; 694 else 695 port_num = mad_agent_priv->agent.port_num; 696 697 /* 698 * Directed route handling starts if the initial LID routed part of 699 * a request or the ending LID routed part of a response is empty. 700 * If we are at the start of the LID routed part, don't update the 701 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec. 702 */ 703 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) == 704 IB_LID_PERMISSIVE && 705 smi_handle_dr_smp_send(smp, device->node_type, port_num) == 706 IB_SMI_DISCARD) { 707 ret = -EINVAL; 708 printk(KERN_ERR PFX "Invalid directed route\n"); 709 goto out; 710 } 711 712 /* Check to post send on QP or process locally */ 713 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD && 714 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD) 715 goto out; 716 717 local = kmalloc(sizeof *local, GFP_ATOMIC); 718 if (!local) { 719 ret = -ENOMEM; 720 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n"); 721 goto out; 722 } 723 local->mad_priv = NULL; 724 local->recv_mad_agent = NULL; 725 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC); 726 if (!mad_priv) { 727 ret = -ENOMEM; 728 printk(KERN_ERR PFX "No memory for local response MAD\n"); 729 kfree(local); 730 goto out; 731 } 732 733 build_smp_wc(mad_agent_priv->agent.qp, 734 send_wr->wr_id, be16_to_cpu(smp->dr_slid), 735 send_wr->wr.ud.pkey_index, 736 send_wr->wr.ud.port_num, &mad_wc); 737 738 /* No GRH for DR SMP */ 739 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL, 740 (struct ib_mad *)smp, 741 (struct ib_mad *)&mad_priv->mad); 742 switch (ret) 743 { 744 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY: 745 if (ib_response_mad(&mad_priv->mad.mad) && 746 mad_agent_priv->agent.recv_handler) { 747 local->mad_priv = mad_priv; 748 local->recv_mad_agent = mad_agent_priv; 749 /* 750 * Reference MAD agent until receive 751 * side of local completion handled 752 */ 753 atomic_inc(&mad_agent_priv->refcount); 754 } else 755 kmem_cache_free(ib_mad_cache, mad_priv); 756 break; 757 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED: 758 kmem_cache_free(ib_mad_cache, mad_priv); 759 break; 760 case IB_MAD_RESULT_SUCCESS: 761 /* Treat like an incoming receive MAD */ 762 port_priv = ib_get_mad_port(mad_agent_priv->agent.device, 763 mad_agent_priv->agent.port_num); 764 if (port_priv) { 765 memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad)); 766 recv_mad_agent = find_mad_agent(port_priv, 767 &mad_priv->mad.mad); 768 } 769 if (!port_priv || !recv_mad_agent) { 770 /* 771 * No receiving agent so drop packet and 772 * generate send completion. 773 */ 774 kmem_cache_free(ib_mad_cache, mad_priv); 775 break; 776 } 777 local->mad_priv = mad_priv; 778 local->recv_mad_agent = recv_mad_agent; 779 break; 780 default: 781 kmem_cache_free(ib_mad_cache, mad_priv); 782 kfree(local); 783 ret = -EINVAL; 784 goto out; 785 } 786 787 local->mad_send_wr = mad_send_wr; 788 /* Reference MAD agent until send side of local completion handled */ 789 atomic_inc(&mad_agent_priv->refcount); 790 /* Queue local completion to local list */ 791 spin_lock_irqsave(&mad_agent_priv->lock, flags); 792 list_add_tail(&local->completion_list, &mad_agent_priv->local_list); 793 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 794 queue_work(mad_agent_priv->qp_info->port_priv->wq, 795 &mad_agent_priv->local_work); 796 ret = 1; 797 out: 798 return ret; 799 } 800 801 static int get_pad_size(int hdr_len, int data_len) 802 { 803 int seg_size, pad; 804 805 seg_size = sizeof(struct ib_mad) - hdr_len; 806 if (data_len && seg_size) { 807 pad = seg_size - data_len % seg_size; 808 return pad == seg_size ? 0 : pad; 809 } else 810 return seg_size; 811 } 812 813 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr) 814 { 815 struct ib_rmpp_segment *s, *t; 816 817 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) { 818 list_del(&s->list); 819 kfree(s); 820 } 821 } 822 823 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr, 824 gfp_t gfp_mask) 825 { 826 struct ib_mad_send_buf *send_buf = &send_wr->send_buf; 827 struct ib_rmpp_mad *rmpp_mad = send_buf->mad; 828 struct ib_rmpp_segment *seg = NULL; 829 int left, seg_size, pad; 830 831 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len; 832 seg_size = send_buf->seg_size; 833 pad = send_wr->pad; 834 835 /* Allocate data segments. */ 836 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) { 837 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask); 838 if (!seg) { 839 printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem " 840 "alloc failed for len %zd, gfp %#x\n", 841 sizeof (*seg) + seg_size, gfp_mask); 842 free_send_rmpp_list(send_wr); 843 return -ENOMEM; 844 } 845 seg->num = ++send_buf->seg_count; 846 list_add_tail(&seg->list, &send_wr->rmpp_list); 847 } 848 849 /* Zero any padding */ 850 if (pad) 851 memset(seg->data + seg_size - pad, 0, pad); 852 853 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv-> 854 agent.rmpp_version; 855 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA; 856 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 857 858 send_wr->cur_seg = container_of(send_wr->rmpp_list.next, 859 struct ib_rmpp_segment, list); 860 send_wr->last_ack_seg = send_wr->cur_seg; 861 return 0; 862 } 863 864 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent, 865 u32 remote_qpn, u16 pkey_index, 866 int rmpp_active, 867 int hdr_len, int data_len, 868 gfp_t gfp_mask) 869 { 870 struct ib_mad_agent_private *mad_agent_priv; 871 struct ib_mad_send_wr_private *mad_send_wr; 872 int pad, message_size, ret, size; 873 void *buf; 874 875 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, 876 agent); 877 pad = get_pad_size(hdr_len, data_len); 878 message_size = hdr_len + data_len + pad; 879 880 if ((!mad_agent->rmpp_version && 881 (rmpp_active || message_size > sizeof(struct ib_mad))) || 882 (!rmpp_active && message_size > sizeof(struct ib_mad))) 883 return ERR_PTR(-EINVAL); 884 885 size = rmpp_active ? hdr_len : sizeof(struct ib_mad); 886 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask); 887 if (!buf) 888 return ERR_PTR(-ENOMEM); 889 890 mad_send_wr = buf + size; 891 INIT_LIST_HEAD(&mad_send_wr->rmpp_list); 892 mad_send_wr->send_buf.mad = buf; 893 mad_send_wr->send_buf.hdr_len = hdr_len; 894 mad_send_wr->send_buf.data_len = data_len; 895 mad_send_wr->pad = pad; 896 897 mad_send_wr->mad_agent_priv = mad_agent_priv; 898 mad_send_wr->sg_list[0].length = hdr_len; 899 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey; 900 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len; 901 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey; 902 903 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr; 904 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list; 905 mad_send_wr->send_wr.num_sge = 2; 906 mad_send_wr->send_wr.opcode = IB_WR_SEND; 907 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED; 908 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn; 909 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY; 910 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index; 911 912 if (rmpp_active) { 913 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask); 914 if (ret) { 915 kfree(buf); 916 return ERR_PTR(ret); 917 } 918 } 919 920 mad_send_wr->send_buf.mad_agent = mad_agent; 921 atomic_inc(&mad_agent_priv->refcount); 922 return &mad_send_wr->send_buf; 923 } 924 EXPORT_SYMBOL(ib_create_send_mad); 925 926 int ib_get_mad_data_offset(u8 mgmt_class) 927 { 928 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM) 929 return IB_MGMT_SA_HDR; 930 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) || 931 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) || 932 (mgmt_class == IB_MGMT_CLASS_BIS)) 933 return IB_MGMT_DEVICE_HDR; 934 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && 935 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)) 936 return IB_MGMT_VENDOR_HDR; 937 else 938 return IB_MGMT_MAD_HDR; 939 } 940 EXPORT_SYMBOL(ib_get_mad_data_offset); 941 942 int ib_is_mad_class_rmpp(u8 mgmt_class) 943 { 944 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) || 945 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) || 946 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) || 947 (mgmt_class == IB_MGMT_CLASS_BIS) || 948 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && 949 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))) 950 return 1; 951 return 0; 952 } 953 EXPORT_SYMBOL(ib_is_mad_class_rmpp); 954 955 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num) 956 { 957 struct ib_mad_send_wr_private *mad_send_wr; 958 struct list_head *list; 959 960 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private, 961 send_buf); 962 list = &mad_send_wr->cur_seg->list; 963 964 if (mad_send_wr->cur_seg->num < seg_num) { 965 list_for_each_entry(mad_send_wr->cur_seg, list, list) 966 if (mad_send_wr->cur_seg->num == seg_num) 967 break; 968 } else if (mad_send_wr->cur_seg->num > seg_num) { 969 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list) 970 if (mad_send_wr->cur_seg->num == seg_num) 971 break; 972 } 973 return mad_send_wr->cur_seg->data; 974 } 975 EXPORT_SYMBOL(ib_get_rmpp_segment); 976 977 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr) 978 { 979 if (mad_send_wr->send_buf.seg_count) 980 return ib_get_rmpp_segment(&mad_send_wr->send_buf, 981 mad_send_wr->seg_num); 982 else 983 return mad_send_wr->send_buf.mad + 984 mad_send_wr->send_buf.hdr_len; 985 } 986 987 void ib_free_send_mad(struct ib_mad_send_buf *send_buf) 988 { 989 struct ib_mad_agent_private *mad_agent_priv; 990 struct ib_mad_send_wr_private *mad_send_wr; 991 992 mad_agent_priv = container_of(send_buf->mad_agent, 993 struct ib_mad_agent_private, agent); 994 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private, 995 send_buf); 996 997 free_send_rmpp_list(mad_send_wr); 998 kfree(send_buf->mad); 999 deref_mad_agent(mad_agent_priv); 1000 } 1001 EXPORT_SYMBOL(ib_free_send_mad); 1002 1003 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr) 1004 { 1005 struct ib_mad_qp_info *qp_info; 1006 struct list_head *list; 1007 struct ib_send_wr *bad_send_wr; 1008 struct ib_mad_agent *mad_agent; 1009 struct ib_sge *sge; 1010 unsigned long flags; 1011 int ret; 1012 1013 /* Set WR ID to find mad_send_wr upon completion */ 1014 qp_info = mad_send_wr->mad_agent_priv->qp_info; 1015 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list; 1016 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue; 1017 1018 mad_agent = mad_send_wr->send_buf.mad_agent; 1019 sge = mad_send_wr->sg_list; 1020 sge[0].addr = ib_dma_map_single(mad_agent->device, 1021 mad_send_wr->send_buf.mad, 1022 sge[0].length, 1023 DMA_TO_DEVICE); 1024 mad_send_wr->header_mapping = sge[0].addr; 1025 1026 sge[1].addr = ib_dma_map_single(mad_agent->device, 1027 ib_get_payload(mad_send_wr), 1028 sge[1].length, 1029 DMA_TO_DEVICE); 1030 mad_send_wr->payload_mapping = sge[1].addr; 1031 1032 spin_lock_irqsave(&qp_info->send_queue.lock, flags); 1033 if (qp_info->send_queue.count < qp_info->send_queue.max_active) { 1034 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr, 1035 &bad_send_wr); 1036 list = &qp_info->send_queue.list; 1037 } else { 1038 ret = 0; 1039 list = &qp_info->overflow_list; 1040 } 1041 1042 if (!ret) { 1043 qp_info->send_queue.count++; 1044 list_add_tail(&mad_send_wr->mad_list.list, list); 1045 } 1046 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); 1047 if (ret) { 1048 ib_dma_unmap_single(mad_agent->device, 1049 mad_send_wr->header_mapping, 1050 sge[0].length, DMA_TO_DEVICE); 1051 ib_dma_unmap_single(mad_agent->device, 1052 mad_send_wr->payload_mapping, 1053 sge[1].length, DMA_TO_DEVICE); 1054 } 1055 return ret; 1056 } 1057 1058 /* 1059 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated 1060 * with the registered client 1061 */ 1062 int ib_post_send_mad(struct ib_mad_send_buf *send_buf, 1063 struct ib_mad_send_buf **bad_send_buf) 1064 { 1065 struct ib_mad_agent_private *mad_agent_priv; 1066 struct ib_mad_send_buf *next_send_buf; 1067 struct ib_mad_send_wr_private *mad_send_wr; 1068 unsigned long flags; 1069 int ret = -EINVAL; 1070 1071 /* Walk list of send WRs and post each on send list */ 1072 for (; send_buf; send_buf = next_send_buf) { 1073 1074 mad_send_wr = container_of(send_buf, 1075 struct ib_mad_send_wr_private, 1076 send_buf); 1077 mad_agent_priv = mad_send_wr->mad_agent_priv; 1078 1079 if (!send_buf->mad_agent->send_handler || 1080 (send_buf->timeout_ms && 1081 !send_buf->mad_agent->recv_handler)) { 1082 ret = -EINVAL; 1083 goto error; 1084 } 1085 1086 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) { 1087 if (mad_agent_priv->agent.rmpp_version) { 1088 ret = -EINVAL; 1089 goto error; 1090 } 1091 } 1092 1093 /* 1094 * Save pointer to next work request to post in case the 1095 * current one completes, and the user modifies the work 1096 * request associated with the completion 1097 */ 1098 next_send_buf = send_buf->next; 1099 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah; 1100 1101 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class == 1102 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 1103 ret = handle_outgoing_dr_smp(mad_agent_priv, 1104 mad_send_wr); 1105 if (ret < 0) /* error */ 1106 goto error; 1107 else if (ret == 1) /* locally consumed */ 1108 continue; 1109 } 1110 1111 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid; 1112 /* Timeout will be updated after send completes */ 1113 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms); 1114 mad_send_wr->max_retries = send_buf->retries; 1115 mad_send_wr->retries_left = send_buf->retries; 1116 send_buf->retries = 0; 1117 /* Reference for work request to QP + response */ 1118 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0); 1119 mad_send_wr->status = IB_WC_SUCCESS; 1120 1121 /* Reference MAD agent until send completes */ 1122 atomic_inc(&mad_agent_priv->refcount); 1123 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1124 list_add_tail(&mad_send_wr->agent_list, 1125 &mad_agent_priv->send_list); 1126 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1127 1128 if (mad_agent_priv->agent.rmpp_version) { 1129 ret = ib_send_rmpp_mad(mad_send_wr); 1130 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED) 1131 ret = ib_send_mad(mad_send_wr); 1132 } else 1133 ret = ib_send_mad(mad_send_wr); 1134 if (ret < 0) { 1135 /* Fail send request */ 1136 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1137 list_del(&mad_send_wr->agent_list); 1138 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1139 atomic_dec(&mad_agent_priv->refcount); 1140 goto error; 1141 } 1142 } 1143 return 0; 1144 error: 1145 if (bad_send_buf) 1146 *bad_send_buf = send_buf; 1147 return ret; 1148 } 1149 EXPORT_SYMBOL(ib_post_send_mad); 1150 1151 /* 1152 * ib_free_recv_mad - Returns data buffers used to receive 1153 * a MAD to the access layer 1154 */ 1155 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc) 1156 { 1157 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf; 1158 struct ib_mad_private_header *mad_priv_hdr; 1159 struct ib_mad_private *priv; 1160 struct list_head free_list; 1161 1162 INIT_LIST_HEAD(&free_list); 1163 list_splice_init(&mad_recv_wc->rmpp_list, &free_list); 1164 1165 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf, 1166 &free_list, list) { 1167 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc, 1168 recv_buf); 1169 mad_priv_hdr = container_of(mad_recv_wc, 1170 struct ib_mad_private_header, 1171 recv_wc); 1172 priv = container_of(mad_priv_hdr, struct ib_mad_private, 1173 header); 1174 kmem_cache_free(ib_mad_cache, priv); 1175 } 1176 } 1177 EXPORT_SYMBOL(ib_free_recv_mad); 1178 1179 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp, 1180 u8 rmpp_version, 1181 ib_mad_send_handler send_handler, 1182 ib_mad_recv_handler recv_handler, 1183 void *context) 1184 { 1185 return ERR_PTR(-EINVAL); /* XXX: for now */ 1186 } 1187 EXPORT_SYMBOL(ib_redirect_mad_qp); 1188 1189 int ib_process_mad_wc(struct ib_mad_agent *mad_agent, 1190 struct ib_wc *wc) 1191 { 1192 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n"); 1193 return 0; 1194 } 1195 EXPORT_SYMBOL(ib_process_mad_wc); 1196 1197 static int method_in_use(struct ib_mad_mgmt_method_table **method, 1198 struct ib_mad_reg_req *mad_reg_req) 1199 { 1200 int i; 1201 1202 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) { 1203 if ((*method)->agent[i]) { 1204 printk(KERN_ERR PFX "Method %d already in use\n", i); 1205 return -EINVAL; 1206 } 1207 } 1208 return 0; 1209 } 1210 1211 static int allocate_method_table(struct ib_mad_mgmt_method_table **method) 1212 { 1213 /* Allocate management method table */ 1214 *method = kzalloc(sizeof **method, GFP_ATOMIC); 1215 if (!*method) { 1216 printk(KERN_ERR PFX "No memory for " 1217 "ib_mad_mgmt_method_table\n"); 1218 return -ENOMEM; 1219 } 1220 1221 return 0; 1222 } 1223 1224 /* 1225 * Check to see if there are any methods still in use 1226 */ 1227 static int check_method_table(struct ib_mad_mgmt_method_table *method) 1228 { 1229 int i; 1230 1231 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) 1232 if (method->agent[i]) 1233 return 1; 1234 return 0; 1235 } 1236 1237 /* 1238 * Check to see if there are any method tables for this class still in use 1239 */ 1240 static int check_class_table(struct ib_mad_mgmt_class_table *class) 1241 { 1242 int i; 1243 1244 for (i = 0; i < MAX_MGMT_CLASS; i++) 1245 if (class->method_table[i]) 1246 return 1; 1247 return 0; 1248 } 1249 1250 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class) 1251 { 1252 int i; 1253 1254 for (i = 0; i < MAX_MGMT_OUI; i++) 1255 if (vendor_class->method_table[i]) 1256 return 1; 1257 return 0; 1258 } 1259 1260 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class, 1261 char *oui) 1262 { 1263 int i; 1264 1265 for (i = 0; i < MAX_MGMT_OUI; i++) 1266 /* Is there matching OUI for this vendor class ? */ 1267 if (!memcmp(vendor_class->oui[i], oui, 3)) 1268 return i; 1269 1270 return -1; 1271 } 1272 1273 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor) 1274 { 1275 int i; 1276 1277 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++) 1278 if (vendor->vendor_class[i]) 1279 return 1; 1280 1281 return 0; 1282 } 1283 1284 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method, 1285 struct ib_mad_agent_private *agent) 1286 { 1287 int i; 1288 1289 /* Remove any methods for this mad agent */ 1290 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) { 1291 if (method->agent[i] == agent) { 1292 method->agent[i] = NULL; 1293 } 1294 } 1295 } 1296 1297 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req, 1298 struct ib_mad_agent_private *agent_priv, 1299 u8 mgmt_class) 1300 { 1301 struct ib_mad_port_private *port_priv; 1302 struct ib_mad_mgmt_class_table **class; 1303 struct ib_mad_mgmt_method_table **method; 1304 int i, ret; 1305 1306 port_priv = agent_priv->qp_info->port_priv; 1307 class = &port_priv->version[mad_reg_req->mgmt_class_version].class; 1308 if (!*class) { 1309 /* Allocate management class table for "new" class version */ 1310 *class = kzalloc(sizeof **class, GFP_ATOMIC); 1311 if (!*class) { 1312 printk(KERN_ERR PFX "No memory for " 1313 "ib_mad_mgmt_class_table\n"); 1314 ret = -ENOMEM; 1315 goto error1; 1316 } 1317 1318 /* Allocate method table for this management class */ 1319 method = &(*class)->method_table[mgmt_class]; 1320 if ((ret = allocate_method_table(method))) 1321 goto error2; 1322 } else { 1323 method = &(*class)->method_table[mgmt_class]; 1324 if (!*method) { 1325 /* Allocate method table for this management class */ 1326 if ((ret = allocate_method_table(method))) 1327 goto error1; 1328 } 1329 } 1330 1331 /* Now, make sure methods are not already in use */ 1332 if (method_in_use(method, mad_reg_req)) 1333 goto error3; 1334 1335 /* Finally, add in methods being registered */ 1336 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) 1337 (*method)->agent[i] = agent_priv; 1338 1339 return 0; 1340 1341 error3: 1342 /* Remove any methods for this mad agent */ 1343 remove_methods_mad_agent(*method, agent_priv); 1344 /* Now, check to see if there are any methods in use */ 1345 if (!check_method_table(*method)) { 1346 /* If not, release management method table */ 1347 kfree(*method); 1348 *method = NULL; 1349 } 1350 ret = -EINVAL; 1351 goto error1; 1352 error2: 1353 kfree(*class); 1354 *class = NULL; 1355 error1: 1356 return ret; 1357 } 1358 1359 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req, 1360 struct ib_mad_agent_private *agent_priv) 1361 { 1362 struct ib_mad_port_private *port_priv; 1363 struct ib_mad_mgmt_vendor_class_table **vendor_table; 1364 struct ib_mad_mgmt_vendor_class_table *vendor = NULL; 1365 struct ib_mad_mgmt_vendor_class *vendor_class = NULL; 1366 struct ib_mad_mgmt_method_table **method; 1367 int i, ret = -ENOMEM; 1368 u8 vclass; 1369 1370 /* "New" vendor (with OUI) class */ 1371 vclass = vendor_class_index(mad_reg_req->mgmt_class); 1372 port_priv = agent_priv->qp_info->port_priv; 1373 vendor_table = &port_priv->version[ 1374 mad_reg_req->mgmt_class_version].vendor; 1375 if (!*vendor_table) { 1376 /* Allocate mgmt vendor class table for "new" class version */ 1377 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC); 1378 if (!vendor) { 1379 printk(KERN_ERR PFX "No memory for " 1380 "ib_mad_mgmt_vendor_class_table\n"); 1381 goto error1; 1382 } 1383 1384 *vendor_table = vendor; 1385 } 1386 if (!(*vendor_table)->vendor_class[vclass]) { 1387 /* Allocate table for this management vendor class */ 1388 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC); 1389 if (!vendor_class) { 1390 printk(KERN_ERR PFX "No memory for " 1391 "ib_mad_mgmt_vendor_class\n"); 1392 goto error2; 1393 } 1394 1395 (*vendor_table)->vendor_class[vclass] = vendor_class; 1396 } 1397 for (i = 0; i < MAX_MGMT_OUI; i++) { 1398 /* Is there matching OUI for this vendor class ? */ 1399 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i], 1400 mad_reg_req->oui, 3)) { 1401 method = &(*vendor_table)->vendor_class[ 1402 vclass]->method_table[i]; 1403 BUG_ON(!*method); 1404 goto check_in_use; 1405 } 1406 } 1407 for (i = 0; i < MAX_MGMT_OUI; i++) { 1408 /* OUI slot available ? */ 1409 if (!is_vendor_oui((*vendor_table)->vendor_class[ 1410 vclass]->oui[i])) { 1411 method = &(*vendor_table)->vendor_class[ 1412 vclass]->method_table[i]; 1413 BUG_ON(*method); 1414 /* Allocate method table for this OUI */ 1415 if ((ret = allocate_method_table(method))) 1416 goto error3; 1417 memcpy((*vendor_table)->vendor_class[vclass]->oui[i], 1418 mad_reg_req->oui, 3); 1419 goto check_in_use; 1420 } 1421 } 1422 printk(KERN_ERR PFX "All OUI slots in use\n"); 1423 goto error3; 1424 1425 check_in_use: 1426 /* Now, make sure methods are not already in use */ 1427 if (method_in_use(method, mad_reg_req)) 1428 goto error4; 1429 1430 /* Finally, add in methods being registered */ 1431 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) 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 = ib_response_mad((struct ib_mad *)wr->send_buf.mad); 1699 rcv_resp = ib_response_mad(rwc->recv_buf.mad); 1700 1701 if (send_resp == rcv_resp) 1702 /* both requests, or both responses. GIDs different */ 1703 return 0; 1704 1705 if (ib_query_ah(wr->send_buf.ah, &attr)) 1706 /* Assume not equal, to avoid false positives. */ 1707 return 0; 1708 1709 if (!!(attr.ah_flags & IB_AH_GRH) != 1710 !!(rwc->wc->wc_flags & IB_WC_GRH)) 1711 /* one has GID, other does not. Assume different */ 1712 return 0; 1713 1714 if (!send_resp && rcv_resp) { 1715 /* is request/response. */ 1716 if (!(attr.ah_flags & IB_AH_GRH)) { 1717 if (ib_get_cached_lmc(device, port_num, &lmc)) 1718 return 0; 1719 return (!lmc || !((attr.src_path_bits ^ 1720 rwc->wc->dlid_path_bits) & 1721 ((1 << lmc) - 1))); 1722 } else { 1723 if (ib_get_cached_gid(device, port_num, 1724 attr.grh.sgid_index, &sgid)) 1725 return 0; 1726 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw, 1727 16); 1728 } 1729 } 1730 1731 if (!(attr.ah_flags & IB_AH_GRH)) 1732 return attr.dlid == rwc->wc->slid; 1733 else 1734 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw, 1735 16); 1736 } 1737 1738 static inline int is_direct(u8 class) 1739 { 1740 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE); 1741 } 1742 1743 struct ib_mad_send_wr_private* 1744 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv, 1745 struct ib_mad_recv_wc *wc) 1746 { 1747 struct ib_mad_send_wr_private *wr; 1748 struct ib_mad *mad; 1749 1750 mad = (struct ib_mad *)wc->recv_buf.mad; 1751 1752 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) { 1753 if ((wr->tid == mad->mad_hdr.tid) && 1754 rcv_has_same_class(wr, wc) && 1755 /* 1756 * Don't check GID for direct routed MADs. 1757 * These might have permissive LIDs. 1758 */ 1759 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) || 1760 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1761 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1762 } 1763 1764 /* 1765 * It's possible to receive the response before we've 1766 * been notified that the send has completed 1767 */ 1768 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) { 1769 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) && 1770 wr->tid == mad->mad_hdr.tid && 1771 wr->timeout && 1772 rcv_has_same_class(wr, wc) && 1773 /* 1774 * Don't check GID for direct routed MADs. 1775 * These might have permissive LIDs. 1776 */ 1777 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) || 1778 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1779 /* Verify request has not been canceled */ 1780 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1781 } 1782 return NULL; 1783 } 1784 1785 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr) 1786 { 1787 mad_send_wr->timeout = 0; 1788 if (mad_send_wr->refcount == 1) 1789 list_move_tail(&mad_send_wr->agent_list, 1790 &mad_send_wr->mad_agent_priv->done_list); 1791 } 1792 1793 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv, 1794 struct ib_mad_recv_wc *mad_recv_wc) 1795 { 1796 struct ib_mad_send_wr_private *mad_send_wr; 1797 struct ib_mad_send_wc mad_send_wc; 1798 unsigned long flags; 1799 1800 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list); 1801 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list); 1802 if (mad_agent_priv->agent.rmpp_version) { 1803 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv, 1804 mad_recv_wc); 1805 if (!mad_recv_wc) { 1806 deref_mad_agent(mad_agent_priv); 1807 return; 1808 } 1809 } 1810 1811 /* Complete corresponding request */ 1812 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) { 1813 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1814 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc); 1815 if (!mad_send_wr) { 1816 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1817 ib_free_recv_mad(mad_recv_wc); 1818 deref_mad_agent(mad_agent_priv); 1819 return; 1820 } 1821 ib_mark_mad_done(mad_send_wr); 1822 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1823 1824 /* Defined behavior is to complete response before request */ 1825 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf; 1826 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, 1827 mad_recv_wc); 1828 atomic_dec(&mad_agent_priv->refcount); 1829 1830 mad_send_wc.status = IB_WC_SUCCESS; 1831 mad_send_wc.vendor_err = 0; 1832 mad_send_wc.send_buf = &mad_send_wr->send_buf; 1833 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 1834 } else { 1835 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, 1836 mad_recv_wc); 1837 deref_mad_agent(mad_agent_priv); 1838 } 1839 } 1840 1841 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv, 1842 struct ib_wc *wc) 1843 { 1844 struct ib_mad_qp_info *qp_info; 1845 struct ib_mad_private_header *mad_priv_hdr; 1846 struct ib_mad_private *recv, *response = NULL; 1847 struct ib_mad_list_head *mad_list; 1848 struct ib_mad_agent_private *mad_agent; 1849 int port_num; 1850 1851 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 1852 qp_info = mad_list->mad_queue->qp_info; 1853 dequeue_mad(mad_list); 1854 1855 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header, 1856 mad_list); 1857 recv = container_of(mad_priv_hdr, struct ib_mad_private, header); 1858 ib_dma_unmap_single(port_priv->device, 1859 recv->header.mapping, 1860 sizeof(struct ib_mad_private) - 1861 sizeof(struct ib_mad_private_header), 1862 DMA_FROM_DEVICE); 1863 1864 /* Setup MAD receive work completion from "normal" work completion */ 1865 recv->header.wc = *wc; 1866 recv->header.recv_wc.wc = &recv->header.wc; 1867 recv->header.recv_wc.mad_len = sizeof(struct ib_mad); 1868 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad; 1869 recv->header.recv_wc.recv_buf.grh = &recv->grh; 1870 1871 if (atomic_read(&qp_info->snoop_count)) 1872 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS); 1873 1874 /* Validate MAD */ 1875 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num)) 1876 goto out; 1877 1878 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL); 1879 if (!response) { 1880 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory " 1881 "for response buffer\n"); 1882 goto out; 1883 } 1884 1885 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) 1886 port_num = wc->port_num; 1887 else 1888 port_num = port_priv->port_num; 1889 1890 if (recv->mad.mad.mad_hdr.mgmt_class == 1891 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 1892 enum smi_forward_action retsmi; 1893 1894 if (smi_handle_dr_smp_recv(&recv->mad.smp, 1895 port_priv->device->node_type, 1896 port_num, 1897 port_priv->device->phys_port_cnt) == 1898 IB_SMI_DISCARD) 1899 goto out; 1900 1901 retsmi = smi_check_forward_dr_smp(&recv->mad.smp); 1902 if (retsmi == IB_SMI_LOCAL) 1903 goto local; 1904 1905 if (retsmi == IB_SMI_SEND) { /* don't forward */ 1906 if (smi_handle_dr_smp_send(&recv->mad.smp, 1907 port_priv->device->node_type, 1908 port_num) == IB_SMI_DISCARD) 1909 goto out; 1910 1911 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD) 1912 goto out; 1913 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) { 1914 /* forward case for switches */ 1915 memcpy(response, recv, sizeof(*response)); 1916 response->header.recv_wc.wc = &response->header.wc; 1917 response->header.recv_wc.recv_buf.mad = &response->mad.mad; 1918 response->header.recv_wc.recv_buf.grh = &response->grh; 1919 1920 agent_send_response(&response->mad.mad, 1921 &response->grh, wc, 1922 port_priv->device, 1923 smi_get_fwd_port(&recv->mad.smp), 1924 qp_info->qp->qp_num); 1925 1926 goto out; 1927 } 1928 } 1929 1930 local: 1931 /* Give driver "right of first refusal" on incoming MAD */ 1932 if (port_priv->device->process_mad) { 1933 int ret; 1934 1935 ret = port_priv->device->process_mad(port_priv->device, 0, 1936 port_priv->port_num, 1937 wc, &recv->grh, 1938 &recv->mad.mad, 1939 &response->mad.mad); 1940 if (ret & IB_MAD_RESULT_SUCCESS) { 1941 if (ret & IB_MAD_RESULT_CONSUMED) 1942 goto out; 1943 if (ret & IB_MAD_RESULT_REPLY) { 1944 agent_send_response(&response->mad.mad, 1945 &recv->grh, wc, 1946 port_priv->device, 1947 port_num, 1948 qp_info->qp->qp_num); 1949 goto out; 1950 } 1951 } 1952 } 1953 1954 mad_agent = find_mad_agent(port_priv, &recv->mad.mad); 1955 if (mad_agent) { 1956 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc); 1957 /* 1958 * recv is freed up in error cases in ib_mad_complete_recv 1959 * or via recv_handler in ib_mad_complete_recv() 1960 */ 1961 recv = NULL; 1962 } 1963 1964 out: 1965 /* Post another receive request for this QP */ 1966 if (response) { 1967 ib_mad_post_receive_mads(qp_info, response); 1968 if (recv) 1969 kmem_cache_free(ib_mad_cache, recv); 1970 } else 1971 ib_mad_post_receive_mads(qp_info, recv); 1972 } 1973 1974 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv) 1975 { 1976 struct ib_mad_send_wr_private *mad_send_wr; 1977 unsigned long delay; 1978 1979 if (list_empty(&mad_agent_priv->wait_list)) { 1980 __cancel_delayed_work(&mad_agent_priv->timed_work); 1981 } else { 1982 mad_send_wr = list_entry(mad_agent_priv->wait_list.next, 1983 struct ib_mad_send_wr_private, 1984 agent_list); 1985 1986 if (time_after(mad_agent_priv->timeout, 1987 mad_send_wr->timeout)) { 1988 mad_agent_priv->timeout = mad_send_wr->timeout; 1989 __cancel_delayed_work(&mad_agent_priv->timed_work); 1990 delay = mad_send_wr->timeout - jiffies; 1991 if ((long)delay <= 0) 1992 delay = 1; 1993 queue_delayed_work(mad_agent_priv->qp_info-> 1994 port_priv->wq, 1995 &mad_agent_priv->timed_work, delay); 1996 } 1997 } 1998 } 1999 2000 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr) 2001 { 2002 struct ib_mad_agent_private *mad_agent_priv; 2003 struct ib_mad_send_wr_private *temp_mad_send_wr; 2004 struct list_head *list_item; 2005 unsigned long delay; 2006 2007 mad_agent_priv = mad_send_wr->mad_agent_priv; 2008 list_del(&mad_send_wr->agent_list); 2009 2010 delay = mad_send_wr->timeout; 2011 mad_send_wr->timeout += jiffies; 2012 2013 if (delay) { 2014 list_for_each_prev(list_item, &mad_agent_priv->wait_list) { 2015 temp_mad_send_wr = list_entry(list_item, 2016 struct ib_mad_send_wr_private, 2017 agent_list); 2018 if (time_after(mad_send_wr->timeout, 2019 temp_mad_send_wr->timeout)) 2020 break; 2021 } 2022 } 2023 else 2024 list_item = &mad_agent_priv->wait_list; 2025 list_add(&mad_send_wr->agent_list, list_item); 2026 2027 /* Reschedule a work item if we have a shorter timeout */ 2028 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) { 2029 __cancel_delayed_work(&mad_agent_priv->timed_work); 2030 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq, 2031 &mad_agent_priv->timed_work, delay); 2032 } 2033 } 2034 2035 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr, 2036 int timeout_ms) 2037 { 2038 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2039 wait_for_response(mad_send_wr); 2040 } 2041 2042 /* 2043 * Process a send work completion 2044 */ 2045 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr, 2046 struct ib_mad_send_wc *mad_send_wc) 2047 { 2048 struct ib_mad_agent_private *mad_agent_priv; 2049 unsigned long flags; 2050 int ret; 2051 2052 mad_agent_priv = mad_send_wr->mad_agent_priv; 2053 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2054 if (mad_agent_priv->agent.rmpp_version) { 2055 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc); 2056 if (ret == IB_RMPP_RESULT_CONSUMED) 2057 goto done; 2058 } else 2059 ret = IB_RMPP_RESULT_UNHANDLED; 2060 2061 if (mad_send_wc->status != IB_WC_SUCCESS && 2062 mad_send_wr->status == IB_WC_SUCCESS) { 2063 mad_send_wr->status = mad_send_wc->status; 2064 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2065 } 2066 2067 if (--mad_send_wr->refcount > 0) { 2068 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout && 2069 mad_send_wr->status == IB_WC_SUCCESS) { 2070 wait_for_response(mad_send_wr); 2071 } 2072 goto done; 2073 } 2074 2075 /* Remove send from MAD agent and notify client of completion */ 2076 list_del(&mad_send_wr->agent_list); 2077 adjust_timeout(mad_agent_priv); 2078 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2079 2080 if (mad_send_wr->status != IB_WC_SUCCESS ) 2081 mad_send_wc->status = mad_send_wr->status; 2082 if (ret == IB_RMPP_RESULT_INTERNAL) 2083 ib_rmpp_send_handler(mad_send_wc); 2084 else 2085 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2086 mad_send_wc); 2087 2088 /* Release reference on agent taken when sending */ 2089 deref_mad_agent(mad_agent_priv); 2090 return; 2091 done: 2092 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2093 } 2094 2095 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv, 2096 struct ib_wc *wc) 2097 { 2098 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr; 2099 struct ib_mad_list_head *mad_list; 2100 struct ib_mad_qp_info *qp_info; 2101 struct ib_mad_queue *send_queue; 2102 struct ib_send_wr *bad_send_wr; 2103 struct ib_mad_send_wc mad_send_wc; 2104 unsigned long flags; 2105 int ret; 2106 2107 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 2108 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2109 mad_list); 2110 send_queue = mad_list->mad_queue; 2111 qp_info = send_queue->qp_info; 2112 2113 retry: 2114 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2115 mad_send_wr->header_mapping, 2116 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE); 2117 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2118 mad_send_wr->payload_mapping, 2119 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE); 2120 queued_send_wr = NULL; 2121 spin_lock_irqsave(&send_queue->lock, flags); 2122 list_del(&mad_list->list); 2123 2124 /* Move queued send to the send queue */ 2125 if (send_queue->count-- > send_queue->max_active) { 2126 mad_list = container_of(qp_info->overflow_list.next, 2127 struct ib_mad_list_head, list); 2128 queued_send_wr = container_of(mad_list, 2129 struct ib_mad_send_wr_private, 2130 mad_list); 2131 list_move_tail(&mad_list->list, &send_queue->list); 2132 } 2133 spin_unlock_irqrestore(&send_queue->lock, flags); 2134 2135 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2136 mad_send_wc.status = wc->status; 2137 mad_send_wc.vendor_err = wc->vendor_err; 2138 if (atomic_read(&qp_info->snoop_count)) 2139 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc, 2140 IB_MAD_SNOOP_SEND_COMPLETIONS); 2141 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 2142 2143 if (queued_send_wr) { 2144 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr, 2145 &bad_send_wr); 2146 if (ret) { 2147 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret); 2148 mad_send_wr = queued_send_wr; 2149 wc->status = IB_WC_LOC_QP_OP_ERR; 2150 goto retry; 2151 } 2152 } 2153 } 2154 2155 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info) 2156 { 2157 struct ib_mad_send_wr_private *mad_send_wr; 2158 struct ib_mad_list_head *mad_list; 2159 unsigned long flags; 2160 2161 spin_lock_irqsave(&qp_info->send_queue.lock, flags); 2162 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) { 2163 mad_send_wr = container_of(mad_list, 2164 struct ib_mad_send_wr_private, 2165 mad_list); 2166 mad_send_wr->retry = 1; 2167 } 2168 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); 2169 } 2170 2171 static void mad_error_handler(struct ib_mad_port_private *port_priv, 2172 struct ib_wc *wc) 2173 { 2174 struct ib_mad_list_head *mad_list; 2175 struct ib_mad_qp_info *qp_info; 2176 struct ib_mad_send_wr_private *mad_send_wr; 2177 int ret; 2178 2179 /* Determine if failure was a send or receive */ 2180 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 2181 qp_info = mad_list->mad_queue->qp_info; 2182 if (mad_list->mad_queue == &qp_info->recv_queue) 2183 /* 2184 * Receive errors indicate that the QP has entered the error 2185 * state - error handling/shutdown code will cleanup 2186 */ 2187 return; 2188 2189 /* 2190 * Send errors will transition the QP to SQE - move 2191 * QP to RTS and repost flushed work requests 2192 */ 2193 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2194 mad_list); 2195 if (wc->status == IB_WC_WR_FLUSH_ERR) { 2196 if (mad_send_wr->retry) { 2197 /* Repost send */ 2198 struct ib_send_wr *bad_send_wr; 2199 2200 mad_send_wr->retry = 0; 2201 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr, 2202 &bad_send_wr); 2203 if (ret) 2204 ib_mad_send_done_handler(port_priv, wc); 2205 } else 2206 ib_mad_send_done_handler(port_priv, wc); 2207 } else { 2208 struct ib_qp_attr *attr; 2209 2210 /* Transition QP to RTS and fail offending send */ 2211 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2212 if (attr) { 2213 attr->qp_state = IB_QPS_RTS; 2214 attr->cur_qp_state = IB_QPS_SQE; 2215 ret = ib_modify_qp(qp_info->qp, attr, 2216 IB_QP_STATE | IB_QP_CUR_STATE); 2217 kfree(attr); 2218 if (ret) 2219 printk(KERN_ERR PFX "mad_error_handler - " 2220 "ib_modify_qp to RTS : %d\n", ret); 2221 else 2222 mark_sends_for_retry(qp_info); 2223 } 2224 ib_mad_send_done_handler(port_priv, wc); 2225 } 2226 } 2227 2228 /* 2229 * IB MAD completion callback 2230 */ 2231 static void ib_mad_completion_handler(struct work_struct *work) 2232 { 2233 struct ib_mad_port_private *port_priv; 2234 struct ib_wc wc; 2235 2236 port_priv = container_of(work, struct ib_mad_port_private, work); 2237 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); 2238 2239 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) { 2240 if (wc.status == IB_WC_SUCCESS) { 2241 switch (wc.opcode) { 2242 case IB_WC_SEND: 2243 ib_mad_send_done_handler(port_priv, &wc); 2244 break; 2245 case IB_WC_RECV: 2246 ib_mad_recv_done_handler(port_priv, &wc); 2247 break; 2248 default: 2249 BUG_ON(1); 2250 break; 2251 } 2252 } else 2253 mad_error_handler(port_priv, &wc); 2254 } 2255 } 2256 2257 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv) 2258 { 2259 unsigned long flags; 2260 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr; 2261 struct ib_mad_send_wc mad_send_wc; 2262 struct list_head cancel_list; 2263 2264 INIT_LIST_HEAD(&cancel_list); 2265 2266 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2267 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2268 &mad_agent_priv->send_list, agent_list) { 2269 if (mad_send_wr->status == IB_WC_SUCCESS) { 2270 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2271 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2272 } 2273 } 2274 2275 /* Empty wait list to prevent receives from finding a request */ 2276 list_splice_init(&mad_agent_priv->wait_list, &cancel_list); 2277 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2278 2279 /* Report all cancelled requests */ 2280 mad_send_wc.status = IB_WC_WR_FLUSH_ERR; 2281 mad_send_wc.vendor_err = 0; 2282 2283 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2284 &cancel_list, agent_list) { 2285 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2286 list_del(&mad_send_wr->agent_list); 2287 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2288 &mad_send_wc); 2289 atomic_dec(&mad_agent_priv->refcount); 2290 } 2291 } 2292 2293 static struct ib_mad_send_wr_private* 2294 find_send_wr(struct ib_mad_agent_private *mad_agent_priv, 2295 struct ib_mad_send_buf *send_buf) 2296 { 2297 struct ib_mad_send_wr_private *mad_send_wr; 2298 2299 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list, 2300 agent_list) { 2301 if (&mad_send_wr->send_buf == send_buf) 2302 return mad_send_wr; 2303 } 2304 2305 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list, 2306 agent_list) { 2307 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) && 2308 &mad_send_wr->send_buf == send_buf) 2309 return mad_send_wr; 2310 } 2311 return NULL; 2312 } 2313 2314 int ib_modify_mad(struct ib_mad_agent *mad_agent, 2315 struct ib_mad_send_buf *send_buf, u32 timeout_ms) 2316 { 2317 struct ib_mad_agent_private *mad_agent_priv; 2318 struct ib_mad_send_wr_private *mad_send_wr; 2319 unsigned long flags; 2320 int active; 2321 2322 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, 2323 agent); 2324 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2325 mad_send_wr = find_send_wr(mad_agent_priv, send_buf); 2326 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) { 2327 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2328 return -EINVAL; 2329 } 2330 2331 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1); 2332 if (!timeout_ms) { 2333 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2334 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2335 } 2336 2337 mad_send_wr->send_buf.timeout_ms = timeout_ms; 2338 if (active) 2339 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2340 else 2341 ib_reset_mad_timeout(mad_send_wr, timeout_ms); 2342 2343 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2344 return 0; 2345 } 2346 EXPORT_SYMBOL(ib_modify_mad); 2347 2348 void ib_cancel_mad(struct ib_mad_agent *mad_agent, 2349 struct ib_mad_send_buf *send_buf) 2350 { 2351 ib_modify_mad(mad_agent, send_buf, 0); 2352 } 2353 EXPORT_SYMBOL(ib_cancel_mad); 2354 2355 static void local_completions(struct work_struct *work) 2356 { 2357 struct ib_mad_agent_private *mad_agent_priv; 2358 struct ib_mad_local_private *local; 2359 struct ib_mad_agent_private *recv_mad_agent; 2360 unsigned long flags; 2361 int free_mad; 2362 struct ib_wc wc; 2363 struct ib_mad_send_wc mad_send_wc; 2364 2365 mad_agent_priv = 2366 container_of(work, struct ib_mad_agent_private, local_work); 2367 2368 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2369 while (!list_empty(&mad_agent_priv->local_list)) { 2370 local = list_entry(mad_agent_priv->local_list.next, 2371 struct ib_mad_local_private, 2372 completion_list); 2373 list_del(&local->completion_list); 2374 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2375 free_mad = 0; 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 free_mad = 1; 2381 goto local_send_completion; 2382 } 2383 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 (free_mad) 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 if (!qp_info->qp) 2609 return; 2610 2611 while (!list_empty(&qp_info->recv_queue.list)) { 2612 2613 mad_list = list_entry(qp_info->recv_queue.list.next, 2614 struct ib_mad_list_head, list); 2615 mad_priv_hdr = container_of(mad_list, 2616 struct ib_mad_private_header, 2617 mad_list); 2618 recv = container_of(mad_priv_hdr, struct ib_mad_private, 2619 header); 2620 2621 /* Remove from posted receive MAD list */ 2622 list_del(&mad_list->list); 2623 2624 ib_dma_unmap_single(qp_info->port_priv->device, 2625 recv->header.mapping, 2626 sizeof(struct ib_mad_private) - 2627 sizeof(struct ib_mad_private_header), 2628 DMA_FROM_DEVICE); 2629 kmem_cache_free(ib_mad_cache, recv); 2630 } 2631 2632 qp_info->recv_queue.count = 0; 2633 } 2634 2635 /* 2636 * Start the port 2637 */ 2638 static int ib_mad_port_start(struct ib_mad_port_private *port_priv) 2639 { 2640 int ret, i; 2641 struct ib_qp_attr *attr; 2642 struct ib_qp *qp; 2643 2644 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2645 if (!attr) { 2646 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n"); 2647 return -ENOMEM; 2648 } 2649 2650 for (i = 0; i < IB_MAD_QPS_CORE; i++) { 2651 qp = port_priv->qp_info[i].qp; 2652 if (!qp) 2653 continue; 2654 2655 /* 2656 * PKey index for QP1 is irrelevant but 2657 * one is needed for the Reset to Init transition 2658 */ 2659 attr->qp_state = IB_QPS_INIT; 2660 attr->pkey_index = 0; 2661 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY; 2662 ret = ib_modify_qp(qp, attr, IB_QP_STATE | 2663 IB_QP_PKEY_INDEX | IB_QP_QKEY); 2664 if (ret) { 2665 printk(KERN_ERR PFX "Couldn't change QP%d state to " 2666 "INIT: %d\n", i, ret); 2667 goto out; 2668 } 2669 2670 attr->qp_state = IB_QPS_RTR; 2671 ret = ib_modify_qp(qp, attr, IB_QP_STATE); 2672 if (ret) { 2673 printk(KERN_ERR PFX "Couldn't change QP%d state to " 2674 "RTR: %d\n", i, ret); 2675 goto out; 2676 } 2677 2678 attr->qp_state = IB_QPS_RTS; 2679 attr->sq_psn = IB_MAD_SEND_Q_PSN; 2680 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN); 2681 if (ret) { 2682 printk(KERN_ERR PFX "Couldn't change QP%d state to " 2683 "RTS: %d\n", i, ret); 2684 goto out; 2685 } 2686 } 2687 2688 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); 2689 if (ret) { 2690 printk(KERN_ERR PFX "Failed to request completion " 2691 "notification: %d\n", ret); 2692 goto out; 2693 } 2694 2695 for (i = 0; i < IB_MAD_QPS_CORE; i++) { 2696 if (!port_priv->qp_info[i].qp) 2697 continue; 2698 2699 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL); 2700 if (ret) { 2701 printk(KERN_ERR PFX "Couldn't post receive WRs\n"); 2702 goto out; 2703 } 2704 } 2705 out: 2706 kfree(attr); 2707 return ret; 2708 } 2709 2710 static void qp_event_handler(struct ib_event *event, void *qp_context) 2711 { 2712 struct ib_mad_qp_info *qp_info = qp_context; 2713 2714 /* It's worse than that! He's dead, Jim! */ 2715 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n", 2716 event->event, qp_info->qp->qp_num); 2717 } 2718 2719 static void init_mad_queue(struct ib_mad_qp_info *qp_info, 2720 struct ib_mad_queue *mad_queue) 2721 { 2722 mad_queue->qp_info = qp_info; 2723 mad_queue->count = 0; 2724 spin_lock_init(&mad_queue->lock); 2725 INIT_LIST_HEAD(&mad_queue->list); 2726 } 2727 2728 static void init_mad_qp(struct ib_mad_port_private *port_priv, 2729 struct ib_mad_qp_info *qp_info) 2730 { 2731 qp_info->port_priv = port_priv; 2732 init_mad_queue(qp_info, &qp_info->send_queue); 2733 init_mad_queue(qp_info, &qp_info->recv_queue); 2734 INIT_LIST_HEAD(&qp_info->overflow_list); 2735 spin_lock_init(&qp_info->snoop_lock); 2736 qp_info->snoop_table = NULL; 2737 qp_info->snoop_table_size = 0; 2738 atomic_set(&qp_info->snoop_count, 0); 2739 } 2740 2741 static int create_mad_qp(struct ib_mad_qp_info *qp_info, 2742 enum ib_qp_type qp_type) 2743 { 2744 struct ib_qp_init_attr qp_init_attr; 2745 int ret; 2746 2747 memset(&qp_init_attr, 0, sizeof qp_init_attr); 2748 qp_init_attr.send_cq = qp_info->port_priv->cq; 2749 qp_init_attr.recv_cq = qp_info->port_priv->cq; 2750 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR; 2751 qp_init_attr.cap.max_send_wr = mad_sendq_size; 2752 qp_init_attr.cap.max_recv_wr = mad_recvq_size; 2753 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG; 2754 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG; 2755 qp_init_attr.qp_type = qp_type; 2756 qp_init_attr.port_num = qp_info->port_priv->port_num; 2757 qp_init_attr.qp_context = qp_info; 2758 qp_init_attr.event_handler = qp_event_handler; 2759 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr); 2760 if (IS_ERR(qp_info->qp)) { 2761 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n", 2762 get_spl_qp_index(qp_type)); 2763 ret = PTR_ERR(qp_info->qp); 2764 goto error; 2765 } 2766 /* Use minimum queue sizes unless the CQ is resized */ 2767 qp_info->send_queue.max_active = mad_sendq_size; 2768 qp_info->recv_queue.max_active = mad_recvq_size; 2769 return 0; 2770 2771 error: 2772 return ret; 2773 } 2774 2775 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info) 2776 { 2777 if (!qp_info->qp) 2778 return; 2779 2780 ib_destroy_qp(qp_info->qp); 2781 kfree(qp_info->snoop_table); 2782 } 2783 2784 /* 2785 * Open the port 2786 * Create the QP, PD, MR, and CQ if needed 2787 */ 2788 static int ib_mad_port_open(struct ib_device *device, 2789 int port_num) 2790 { 2791 int ret, cq_size; 2792 struct ib_mad_port_private *port_priv; 2793 unsigned long flags; 2794 char name[sizeof "ib_mad123"]; 2795 int has_smi; 2796 2797 /* Create new device info */ 2798 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL); 2799 if (!port_priv) { 2800 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n"); 2801 return -ENOMEM; 2802 } 2803 2804 port_priv->device = device; 2805 port_priv->port_num = port_num; 2806 spin_lock_init(&port_priv->reg_lock); 2807 INIT_LIST_HEAD(&port_priv->agent_list); 2808 init_mad_qp(port_priv, &port_priv->qp_info[0]); 2809 init_mad_qp(port_priv, &port_priv->qp_info[1]); 2810 2811 cq_size = mad_sendq_size + mad_recvq_size; 2812 has_smi = rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_INFINIBAND; 2813 if (has_smi) 2814 cq_size *= 2; 2815 2816 port_priv->cq = ib_create_cq(port_priv->device, 2817 ib_mad_thread_completion_handler, 2818 NULL, port_priv, cq_size, 0); 2819 if (IS_ERR(port_priv->cq)) { 2820 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n"); 2821 ret = PTR_ERR(port_priv->cq); 2822 goto error3; 2823 } 2824 2825 port_priv->pd = ib_alloc_pd(device); 2826 if (IS_ERR(port_priv->pd)) { 2827 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n"); 2828 ret = PTR_ERR(port_priv->pd); 2829 goto error4; 2830 } 2831 2832 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE); 2833 if (IS_ERR(port_priv->mr)) { 2834 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n"); 2835 ret = PTR_ERR(port_priv->mr); 2836 goto error5; 2837 } 2838 2839 if (has_smi) { 2840 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI); 2841 if (ret) 2842 goto error6; 2843 } 2844 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI); 2845 if (ret) 2846 goto error7; 2847 2848 snprintf(name, sizeof name, "ib_mad%d", port_num); 2849 port_priv->wq = create_singlethread_workqueue(name); 2850 if (!port_priv->wq) { 2851 ret = -ENOMEM; 2852 goto error8; 2853 } 2854 INIT_WORK(&port_priv->work, ib_mad_completion_handler); 2855 2856 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2857 list_add_tail(&port_priv->port_list, &ib_mad_port_list); 2858 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2859 2860 ret = ib_mad_port_start(port_priv); 2861 if (ret) { 2862 printk(KERN_ERR PFX "Couldn't start port\n"); 2863 goto error9; 2864 } 2865 2866 return 0; 2867 2868 error9: 2869 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2870 list_del_init(&port_priv->port_list); 2871 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2872 2873 destroy_workqueue(port_priv->wq); 2874 error8: 2875 destroy_mad_qp(&port_priv->qp_info[1]); 2876 error7: 2877 destroy_mad_qp(&port_priv->qp_info[0]); 2878 error6: 2879 ib_dereg_mr(port_priv->mr); 2880 error5: 2881 ib_dealloc_pd(port_priv->pd); 2882 error4: 2883 ib_destroy_cq(port_priv->cq); 2884 cleanup_recv_queue(&port_priv->qp_info[1]); 2885 cleanup_recv_queue(&port_priv->qp_info[0]); 2886 error3: 2887 kfree(port_priv); 2888 2889 return ret; 2890 } 2891 2892 /* 2893 * Close the port 2894 * If there are no classes using the port, free the port 2895 * resources (CQ, MR, PD, QP) and remove the port's info structure 2896 */ 2897 static int ib_mad_port_close(struct ib_device *device, int port_num) 2898 { 2899 struct ib_mad_port_private *port_priv; 2900 unsigned long flags; 2901 2902 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2903 port_priv = __ib_get_mad_port(device, port_num); 2904 if (port_priv == NULL) { 2905 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2906 printk(KERN_ERR PFX "Port %d not found\n", port_num); 2907 return -ENODEV; 2908 } 2909 list_del_init(&port_priv->port_list); 2910 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2911 2912 destroy_workqueue(port_priv->wq); 2913 destroy_mad_qp(&port_priv->qp_info[1]); 2914 destroy_mad_qp(&port_priv->qp_info[0]); 2915 ib_dereg_mr(port_priv->mr); 2916 ib_dealloc_pd(port_priv->pd); 2917 ib_destroy_cq(port_priv->cq); 2918 cleanup_recv_queue(&port_priv->qp_info[1]); 2919 cleanup_recv_queue(&port_priv->qp_info[0]); 2920 /* XXX: Handle deallocation of MAD registration tables */ 2921 2922 kfree(port_priv); 2923 2924 return 0; 2925 } 2926 2927 static void ib_mad_init_device(struct ib_device *device) 2928 { 2929 int start, end, i; 2930 2931 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 2932 return; 2933 2934 if (device->node_type == RDMA_NODE_IB_SWITCH) { 2935 start = 0; 2936 end = 0; 2937 } else { 2938 start = 1; 2939 end = device->phys_port_cnt; 2940 } 2941 2942 for (i = start; i <= end; i++) { 2943 if (ib_mad_port_open(device, i)) { 2944 printk(KERN_ERR PFX "Couldn't open %s port %d\n", 2945 device->name, i); 2946 goto error; 2947 } 2948 if (ib_agent_port_open(device, i)) { 2949 printk(KERN_ERR PFX "Couldn't open %s port %d " 2950 "for agents\n", 2951 device->name, i); 2952 goto error_agent; 2953 } 2954 } 2955 return; 2956 2957 error_agent: 2958 if (ib_mad_port_close(device, i)) 2959 printk(KERN_ERR PFX "Couldn't close %s port %d\n", 2960 device->name, i); 2961 2962 error: 2963 i--; 2964 2965 while (i >= start) { 2966 if (ib_agent_port_close(device, i)) 2967 printk(KERN_ERR PFX "Couldn't close %s port %d " 2968 "for agents\n", 2969 device->name, i); 2970 if (ib_mad_port_close(device, i)) 2971 printk(KERN_ERR PFX "Couldn't close %s port %d\n", 2972 device->name, i); 2973 i--; 2974 } 2975 } 2976 2977 static void ib_mad_remove_device(struct ib_device *device) 2978 { 2979 int i, num_ports, cur_port; 2980 2981 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 2982 return; 2983 2984 if (device->node_type == RDMA_NODE_IB_SWITCH) { 2985 num_ports = 1; 2986 cur_port = 0; 2987 } else { 2988 num_ports = device->phys_port_cnt; 2989 cur_port = 1; 2990 } 2991 for (i = 0; i < num_ports; i++, cur_port++) { 2992 if (ib_agent_port_close(device, cur_port)) 2993 printk(KERN_ERR PFX "Couldn't close %s port %d " 2994 "for agents\n", 2995 device->name, cur_port); 2996 if (ib_mad_port_close(device, cur_port)) 2997 printk(KERN_ERR PFX "Couldn't close %s port %d\n", 2998 device->name, cur_port); 2999 } 3000 } 3001 3002 static struct ib_client mad_client = { 3003 .name = "mad", 3004 .add = ib_mad_init_device, 3005 .remove = ib_mad_remove_device 3006 }; 3007 3008 static int __init ib_mad_init_module(void) 3009 { 3010 int ret; 3011 3012 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE); 3013 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE); 3014 3015 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE); 3016 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE); 3017 3018 ib_mad_cache = kmem_cache_create("ib_mad", 3019 sizeof(struct ib_mad_private), 3020 0, 3021 SLAB_HWCACHE_ALIGN, 3022 NULL); 3023 if (!ib_mad_cache) { 3024 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n"); 3025 ret = -ENOMEM; 3026 goto error1; 3027 } 3028 3029 INIT_LIST_HEAD(&ib_mad_port_list); 3030 3031 if (ib_register_client(&mad_client)) { 3032 printk(KERN_ERR PFX "Couldn't register ib_mad client\n"); 3033 ret = -EINVAL; 3034 goto error2; 3035 } 3036 3037 return 0; 3038 3039 error2: 3040 kmem_cache_destroy(ib_mad_cache); 3041 error1: 3042 return ret; 3043 } 3044 3045 static void __exit ib_mad_cleanup_module(void) 3046 { 3047 ib_unregister_client(&mad_client); 3048 kmem_cache_destroy(ib_mad_cache); 3049 } 3050 3051 module_init(ib_mad_init_module); 3052 module_exit(ib_mad_cleanup_module); 3053