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 37 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 38 39 #include <linux/dma-mapping.h> 40 #include <linux/slab.h> 41 #include <linux/module.h> 42 #include <rdma/ib_cache.h> 43 44 #include "mad_priv.h" 45 #include "mad_rmpp.h" 46 #include "smi.h" 47 #include "agent.h" 48 49 MODULE_LICENSE("Dual BSD/GPL"); 50 MODULE_DESCRIPTION("kernel IB MAD API"); 51 MODULE_AUTHOR("Hal Rosenstock"); 52 MODULE_AUTHOR("Sean Hefty"); 53 54 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE; 55 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE; 56 57 module_param_named(send_queue_size, mad_sendq_size, int, 0444); 58 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests"); 59 module_param_named(recv_queue_size, mad_recvq_size, int, 0444); 60 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests"); 61 62 static struct kmem_cache *ib_mad_cache; 63 64 static struct list_head ib_mad_port_list; 65 static u32 ib_mad_client_id = 0; 66 67 /* Port list lock */ 68 static DEFINE_SPINLOCK(ib_mad_port_list_lock); 69 70 /* Forward declarations */ 71 static int method_in_use(struct ib_mad_mgmt_method_table **method, 72 struct ib_mad_reg_req *mad_reg_req); 73 static void remove_mad_reg_req(struct ib_mad_agent_private *priv); 74 static struct ib_mad_agent_private *find_mad_agent( 75 struct ib_mad_port_private *port_priv, 76 struct ib_mad *mad); 77 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info, 78 struct ib_mad_private *mad); 79 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv); 80 static void timeout_sends(struct work_struct *work); 81 static void local_completions(struct work_struct *work); 82 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req, 83 struct ib_mad_agent_private *agent_priv, 84 u8 mgmt_class); 85 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req, 86 struct ib_mad_agent_private *agent_priv); 87 88 /* 89 * Returns a ib_mad_port_private structure or NULL for a device/port 90 * Assumes ib_mad_port_list_lock is being held 91 */ 92 static inline struct ib_mad_port_private * 93 __ib_get_mad_port(struct ib_device *device, int port_num) 94 { 95 struct ib_mad_port_private *entry; 96 97 list_for_each_entry(entry, &ib_mad_port_list, port_list) { 98 if (entry->device == device && entry->port_num == port_num) 99 return entry; 100 } 101 return NULL; 102 } 103 104 /* 105 * Wrapper function to return a ib_mad_port_private structure or NULL 106 * for a device/port 107 */ 108 static inline struct ib_mad_port_private * 109 ib_get_mad_port(struct ib_device *device, int port_num) 110 { 111 struct ib_mad_port_private *entry; 112 unsigned long flags; 113 114 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 115 entry = __ib_get_mad_port(device, port_num); 116 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 117 118 return entry; 119 } 120 121 static inline u8 convert_mgmt_class(u8 mgmt_class) 122 { 123 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */ 124 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ? 125 0 : mgmt_class; 126 } 127 128 static int get_spl_qp_index(enum ib_qp_type qp_type) 129 { 130 switch (qp_type) 131 { 132 case IB_QPT_SMI: 133 return 0; 134 case IB_QPT_GSI: 135 return 1; 136 default: 137 return -1; 138 } 139 } 140 141 static int vendor_class_index(u8 mgmt_class) 142 { 143 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START; 144 } 145 146 static int is_vendor_class(u8 mgmt_class) 147 { 148 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) || 149 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END)) 150 return 0; 151 return 1; 152 } 153 154 static int is_vendor_oui(char *oui) 155 { 156 if (oui[0] || oui[1] || oui[2]) 157 return 1; 158 return 0; 159 } 160 161 static int is_vendor_method_in_use( 162 struct ib_mad_mgmt_vendor_class *vendor_class, 163 struct ib_mad_reg_req *mad_reg_req) 164 { 165 struct ib_mad_mgmt_method_table *method; 166 int i; 167 168 for (i = 0; i < MAX_MGMT_OUI; i++) { 169 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) { 170 method = vendor_class->method_table[i]; 171 if (method) { 172 if (method_in_use(&method, mad_reg_req)) 173 return 1; 174 else 175 break; 176 } 177 } 178 } 179 return 0; 180 } 181 182 int ib_response_mad(struct ib_mad *mad) 183 { 184 return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) || 185 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) || 186 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) && 187 (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP))); 188 } 189 EXPORT_SYMBOL(ib_response_mad); 190 191 /* 192 * ib_register_mad_agent - Register to send/receive MADs 193 */ 194 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device, 195 u8 port_num, 196 enum ib_qp_type qp_type, 197 struct ib_mad_reg_req *mad_reg_req, 198 u8 rmpp_version, 199 ib_mad_send_handler send_handler, 200 ib_mad_recv_handler recv_handler, 201 void *context, 202 u32 registration_flags) 203 { 204 struct ib_mad_port_private *port_priv; 205 struct ib_mad_agent *ret = ERR_PTR(-EINVAL); 206 struct ib_mad_agent_private *mad_agent_priv; 207 struct ib_mad_reg_req *reg_req = NULL; 208 struct ib_mad_mgmt_class_table *class; 209 struct ib_mad_mgmt_vendor_class_table *vendor; 210 struct ib_mad_mgmt_vendor_class *vendor_class; 211 struct ib_mad_mgmt_method_table *method; 212 int ret2, qpn; 213 unsigned long flags; 214 u8 mgmt_class, vclass; 215 216 /* Validate parameters */ 217 qpn = get_spl_qp_index(qp_type); 218 if (qpn == -1) { 219 dev_notice(&device->dev, 220 "ib_register_mad_agent: invalid QP Type %d\n", 221 qp_type); 222 goto error1; 223 } 224 225 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) { 226 dev_notice(&device->dev, 227 "ib_register_mad_agent: invalid RMPP Version %u\n", 228 rmpp_version); 229 goto error1; 230 } 231 232 /* Validate MAD registration request if supplied */ 233 if (mad_reg_req) { 234 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) { 235 dev_notice(&device->dev, 236 "ib_register_mad_agent: invalid Class Version %u\n", 237 mad_reg_req->mgmt_class_version); 238 goto error1; 239 } 240 if (!recv_handler) { 241 dev_notice(&device->dev, 242 "ib_register_mad_agent: no recv_handler\n"); 243 goto error1; 244 } 245 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) { 246 /* 247 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only 248 * one in this range currently allowed 249 */ 250 if (mad_reg_req->mgmt_class != 251 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 252 dev_notice(&device->dev, 253 "ib_register_mad_agent: Invalid Mgmt Class 0x%x\n", 254 mad_reg_req->mgmt_class); 255 goto error1; 256 } 257 } else if (mad_reg_req->mgmt_class == 0) { 258 /* 259 * Class 0 is reserved in IBA and is used for 260 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE 261 */ 262 dev_notice(&device->dev, 263 "ib_register_mad_agent: Invalid Mgmt Class 0\n"); 264 goto error1; 265 } else if (is_vendor_class(mad_reg_req->mgmt_class)) { 266 /* 267 * If class is in "new" vendor range, 268 * ensure supplied OUI is not zero 269 */ 270 if (!is_vendor_oui(mad_reg_req->oui)) { 271 dev_notice(&device->dev, 272 "ib_register_mad_agent: No OUI specified for class 0x%x\n", 273 mad_reg_req->mgmt_class); 274 goto error1; 275 } 276 } 277 /* Make sure class supplied is consistent with RMPP */ 278 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) { 279 if (rmpp_version) { 280 dev_notice(&device->dev, 281 "ib_register_mad_agent: RMPP version for non-RMPP class 0x%x\n", 282 mad_reg_req->mgmt_class); 283 goto error1; 284 } 285 } 286 287 /* Make sure class supplied is consistent with QP type */ 288 if (qp_type == IB_QPT_SMI) { 289 if ((mad_reg_req->mgmt_class != 290 IB_MGMT_CLASS_SUBN_LID_ROUTED) && 291 (mad_reg_req->mgmt_class != 292 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) { 293 dev_notice(&device->dev, 294 "ib_register_mad_agent: Invalid SM QP type: class 0x%x\n", 295 mad_reg_req->mgmt_class); 296 goto error1; 297 } 298 } else { 299 if ((mad_reg_req->mgmt_class == 300 IB_MGMT_CLASS_SUBN_LID_ROUTED) || 301 (mad_reg_req->mgmt_class == 302 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) { 303 dev_notice(&device->dev, 304 "ib_register_mad_agent: Invalid GS QP type: class 0x%x\n", 305 mad_reg_req->mgmt_class); 306 goto error1; 307 } 308 } 309 } else { 310 /* No registration request supplied */ 311 if (!send_handler) 312 goto error1; 313 if (registration_flags & IB_MAD_USER_RMPP) 314 goto error1; 315 } 316 317 /* Validate device and port */ 318 port_priv = ib_get_mad_port(device, port_num); 319 if (!port_priv) { 320 dev_notice(&device->dev, "ib_register_mad_agent: Invalid port\n"); 321 ret = ERR_PTR(-ENODEV); 322 goto error1; 323 } 324 325 /* Verify the QP requested is supported. For example, Ethernet devices 326 * will not have QP0 */ 327 if (!port_priv->qp_info[qpn].qp) { 328 dev_notice(&device->dev, 329 "ib_register_mad_agent: QP %d not supported\n", qpn); 330 ret = ERR_PTR(-EPROTONOSUPPORT); 331 goto error1; 332 } 333 334 /* Allocate structures */ 335 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL); 336 if (!mad_agent_priv) { 337 ret = ERR_PTR(-ENOMEM); 338 goto error1; 339 } 340 341 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd, 342 IB_ACCESS_LOCAL_WRITE); 343 if (IS_ERR(mad_agent_priv->agent.mr)) { 344 ret = ERR_PTR(-ENOMEM); 345 goto error2; 346 } 347 348 if (mad_reg_req) { 349 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL); 350 if (!reg_req) { 351 ret = ERR_PTR(-ENOMEM); 352 goto error3; 353 } 354 } 355 356 /* Now, fill in the various structures */ 357 mad_agent_priv->qp_info = &port_priv->qp_info[qpn]; 358 mad_agent_priv->reg_req = reg_req; 359 mad_agent_priv->agent.rmpp_version = rmpp_version; 360 mad_agent_priv->agent.device = device; 361 mad_agent_priv->agent.recv_handler = recv_handler; 362 mad_agent_priv->agent.send_handler = send_handler; 363 mad_agent_priv->agent.context = context; 364 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp; 365 mad_agent_priv->agent.port_num = port_num; 366 mad_agent_priv->agent.flags = registration_flags; 367 spin_lock_init(&mad_agent_priv->lock); 368 INIT_LIST_HEAD(&mad_agent_priv->send_list); 369 INIT_LIST_HEAD(&mad_agent_priv->wait_list); 370 INIT_LIST_HEAD(&mad_agent_priv->done_list); 371 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list); 372 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends); 373 INIT_LIST_HEAD(&mad_agent_priv->local_list); 374 INIT_WORK(&mad_agent_priv->local_work, local_completions); 375 atomic_set(&mad_agent_priv->refcount, 1); 376 init_completion(&mad_agent_priv->comp); 377 378 spin_lock_irqsave(&port_priv->reg_lock, flags); 379 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id; 380 381 /* 382 * Make sure MAD registration (if supplied) 383 * is non overlapping with any existing ones 384 */ 385 if (mad_reg_req) { 386 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class); 387 if (!is_vendor_class(mgmt_class)) { 388 class = port_priv->version[mad_reg_req-> 389 mgmt_class_version].class; 390 if (class) { 391 method = class->method_table[mgmt_class]; 392 if (method) { 393 if (method_in_use(&method, 394 mad_reg_req)) 395 goto error4; 396 } 397 } 398 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv, 399 mgmt_class); 400 } else { 401 /* "New" vendor class range */ 402 vendor = port_priv->version[mad_reg_req-> 403 mgmt_class_version].vendor; 404 if (vendor) { 405 vclass = vendor_class_index(mgmt_class); 406 vendor_class = vendor->vendor_class[vclass]; 407 if (vendor_class) { 408 if (is_vendor_method_in_use( 409 vendor_class, 410 mad_reg_req)) 411 goto error4; 412 } 413 } 414 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv); 415 } 416 if (ret2) { 417 ret = ERR_PTR(ret2); 418 goto error4; 419 } 420 } 421 422 /* Add mad agent into port's agent list */ 423 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list); 424 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 425 426 return &mad_agent_priv->agent; 427 428 error4: 429 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 430 kfree(reg_req); 431 error3: 432 ib_dereg_mr(mad_agent_priv->agent.mr); 433 error2: 434 kfree(mad_agent_priv); 435 error1: 436 return ret; 437 } 438 EXPORT_SYMBOL(ib_register_mad_agent); 439 440 static inline int is_snooping_sends(int mad_snoop_flags) 441 { 442 return (mad_snoop_flags & 443 (/*IB_MAD_SNOOP_POSTED_SENDS | 444 IB_MAD_SNOOP_RMPP_SENDS |*/ 445 IB_MAD_SNOOP_SEND_COMPLETIONS /*| 446 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/)); 447 } 448 449 static inline int is_snooping_recvs(int mad_snoop_flags) 450 { 451 return (mad_snoop_flags & 452 (IB_MAD_SNOOP_RECVS /*| 453 IB_MAD_SNOOP_RMPP_RECVS*/)); 454 } 455 456 static int register_snoop_agent(struct ib_mad_qp_info *qp_info, 457 struct ib_mad_snoop_private *mad_snoop_priv) 458 { 459 struct ib_mad_snoop_private **new_snoop_table; 460 unsigned long flags; 461 int i; 462 463 spin_lock_irqsave(&qp_info->snoop_lock, flags); 464 /* Check for empty slot in array. */ 465 for (i = 0; i < qp_info->snoop_table_size; i++) 466 if (!qp_info->snoop_table[i]) 467 break; 468 469 if (i == qp_info->snoop_table_size) { 470 /* Grow table. */ 471 new_snoop_table = krealloc(qp_info->snoop_table, 472 sizeof mad_snoop_priv * 473 (qp_info->snoop_table_size + 1), 474 GFP_ATOMIC); 475 if (!new_snoop_table) { 476 i = -ENOMEM; 477 goto out; 478 } 479 480 qp_info->snoop_table = new_snoop_table; 481 qp_info->snoop_table_size++; 482 } 483 qp_info->snoop_table[i] = mad_snoop_priv; 484 atomic_inc(&qp_info->snoop_count); 485 out: 486 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 487 return i; 488 } 489 490 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device, 491 u8 port_num, 492 enum ib_qp_type qp_type, 493 int mad_snoop_flags, 494 ib_mad_snoop_handler snoop_handler, 495 ib_mad_recv_handler recv_handler, 496 void *context) 497 { 498 struct ib_mad_port_private *port_priv; 499 struct ib_mad_agent *ret; 500 struct ib_mad_snoop_private *mad_snoop_priv; 501 int qpn; 502 503 /* Validate parameters */ 504 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) || 505 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) { 506 ret = ERR_PTR(-EINVAL); 507 goto error1; 508 } 509 qpn = get_spl_qp_index(qp_type); 510 if (qpn == -1) { 511 ret = ERR_PTR(-EINVAL); 512 goto error1; 513 } 514 port_priv = ib_get_mad_port(device, port_num); 515 if (!port_priv) { 516 ret = ERR_PTR(-ENODEV); 517 goto error1; 518 } 519 /* Allocate structures */ 520 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL); 521 if (!mad_snoop_priv) { 522 ret = ERR_PTR(-ENOMEM); 523 goto error1; 524 } 525 526 /* Now, fill in the various structures */ 527 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn]; 528 mad_snoop_priv->agent.device = device; 529 mad_snoop_priv->agent.recv_handler = recv_handler; 530 mad_snoop_priv->agent.snoop_handler = snoop_handler; 531 mad_snoop_priv->agent.context = context; 532 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp; 533 mad_snoop_priv->agent.port_num = port_num; 534 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags; 535 init_completion(&mad_snoop_priv->comp); 536 mad_snoop_priv->snoop_index = register_snoop_agent( 537 &port_priv->qp_info[qpn], 538 mad_snoop_priv); 539 if (mad_snoop_priv->snoop_index < 0) { 540 ret = ERR_PTR(mad_snoop_priv->snoop_index); 541 goto error2; 542 } 543 544 atomic_set(&mad_snoop_priv->refcount, 1); 545 return &mad_snoop_priv->agent; 546 547 error2: 548 kfree(mad_snoop_priv); 549 error1: 550 return ret; 551 } 552 EXPORT_SYMBOL(ib_register_mad_snoop); 553 554 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv) 555 { 556 if (atomic_dec_and_test(&mad_agent_priv->refcount)) 557 complete(&mad_agent_priv->comp); 558 } 559 560 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv) 561 { 562 if (atomic_dec_and_test(&mad_snoop_priv->refcount)) 563 complete(&mad_snoop_priv->comp); 564 } 565 566 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv) 567 { 568 struct ib_mad_port_private *port_priv; 569 unsigned long flags; 570 571 /* Note that we could still be handling received MADs */ 572 573 /* 574 * Canceling all sends results in dropping received response 575 * MADs, preventing us from queuing additional work 576 */ 577 cancel_mads(mad_agent_priv); 578 port_priv = mad_agent_priv->qp_info->port_priv; 579 cancel_delayed_work(&mad_agent_priv->timed_work); 580 581 spin_lock_irqsave(&port_priv->reg_lock, flags); 582 remove_mad_reg_req(mad_agent_priv); 583 list_del(&mad_agent_priv->agent_list); 584 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 585 586 flush_workqueue(port_priv->wq); 587 ib_cancel_rmpp_recvs(mad_agent_priv); 588 589 deref_mad_agent(mad_agent_priv); 590 wait_for_completion(&mad_agent_priv->comp); 591 592 kfree(mad_agent_priv->reg_req); 593 ib_dereg_mr(mad_agent_priv->agent.mr); 594 kfree(mad_agent_priv); 595 } 596 597 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv) 598 { 599 struct ib_mad_qp_info *qp_info; 600 unsigned long flags; 601 602 qp_info = mad_snoop_priv->qp_info; 603 spin_lock_irqsave(&qp_info->snoop_lock, flags); 604 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL; 605 atomic_dec(&qp_info->snoop_count); 606 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 607 608 deref_snoop_agent(mad_snoop_priv); 609 wait_for_completion(&mad_snoop_priv->comp); 610 611 kfree(mad_snoop_priv); 612 } 613 614 /* 615 * ib_unregister_mad_agent - Unregisters a client from using MAD services 616 */ 617 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent) 618 { 619 struct ib_mad_agent_private *mad_agent_priv; 620 struct ib_mad_snoop_private *mad_snoop_priv; 621 622 /* If the TID is zero, the agent can only snoop. */ 623 if (mad_agent->hi_tid) { 624 mad_agent_priv = container_of(mad_agent, 625 struct ib_mad_agent_private, 626 agent); 627 unregister_mad_agent(mad_agent_priv); 628 } else { 629 mad_snoop_priv = container_of(mad_agent, 630 struct ib_mad_snoop_private, 631 agent); 632 unregister_mad_snoop(mad_snoop_priv); 633 } 634 return 0; 635 } 636 EXPORT_SYMBOL(ib_unregister_mad_agent); 637 638 static void dequeue_mad(struct ib_mad_list_head *mad_list) 639 { 640 struct ib_mad_queue *mad_queue; 641 unsigned long flags; 642 643 BUG_ON(!mad_list->mad_queue); 644 mad_queue = mad_list->mad_queue; 645 spin_lock_irqsave(&mad_queue->lock, flags); 646 list_del(&mad_list->list); 647 mad_queue->count--; 648 spin_unlock_irqrestore(&mad_queue->lock, flags); 649 } 650 651 static void snoop_send(struct ib_mad_qp_info *qp_info, 652 struct ib_mad_send_buf *send_buf, 653 struct ib_mad_send_wc *mad_send_wc, 654 int mad_snoop_flags) 655 { 656 struct ib_mad_snoop_private *mad_snoop_priv; 657 unsigned long flags; 658 int i; 659 660 spin_lock_irqsave(&qp_info->snoop_lock, flags); 661 for (i = 0; i < qp_info->snoop_table_size; i++) { 662 mad_snoop_priv = qp_info->snoop_table[i]; 663 if (!mad_snoop_priv || 664 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags)) 665 continue; 666 667 atomic_inc(&mad_snoop_priv->refcount); 668 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 669 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent, 670 send_buf, mad_send_wc); 671 deref_snoop_agent(mad_snoop_priv); 672 spin_lock_irqsave(&qp_info->snoop_lock, flags); 673 } 674 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 675 } 676 677 static void snoop_recv(struct ib_mad_qp_info *qp_info, 678 struct ib_mad_recv_wc *mad_recv_wc, 679 int mad_snoop_flags) 680 { 681 struct ib_mad_snoop_private *mad_snoop_priv; 682 unsigned long flags; 683 int i; 684 685 spin_lock_irqsave(&qp_info->snoop_lock, flags); 686 for (i = 0; i < qp_info->snoop_table_size; i++) { 687 mad_snoop_priv = qp_info->snoop_table[i]; 688 if (!mad_snoop_priv || 689 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags)) 690 continue; 691 692 atomic_inc(&mad_snoop_priv->refcount); 693 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 694 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent, 695 mad_recv_wc); 696 deref_snoop_agent(mad_snoop_priv); 697 spin_lock_irqsave(&qp_info->snoop_lock, flags); 698 } 699 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 700 } 701 702 static void build_smp_wc(struct ib_qp *qp, 703 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num, 704 struct ib_wc *wc) 705 { 706 memset(wc, 0, sizeof *wc); 707 wc->wr_id = wr_id; 708 wc->status = IB_WC_SUCCESS; 709 wc->opcode = IB_WC_RECV; 710 wc->pkey_index = pkey_index; 711 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh); 712 wc->src_qp = IB_QP0; 713 wc->qp = qp; 714 wc->slid = slid; 715 wc->sl = 0; 716 wc->dlid_path_bits = 0; 717 wc->port_num = port_num; 718 } 719 720 /* 721 * Return 0 if SMP is to be sent 722 * Return 1 if SMP was consumed locally (whether or not solicited) 723 * Return < 0 if error 724 */ 725 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv, 726 struct ib_mad_send_wr_private *mad_send_wr) 727 { 728 int ret = 0; 729 struct ib_smp *smp = mad_send_wr->send_buf.mad; 730 unsigned long flags; 731 struct ib_mad_local_private *local; 732 struct ib_mad_private *mad_priv; 733 struct ib_mad_port_private *port_priv; 734 struct ib_mad_agent_private *recv_mad_agent = NULL; 735 struct ib_device *device = mad_agent_priv->agent.device; 736 u8 port_num; 737 struct ib_wc mad_wc; 738 struct ib_send_wr *send_wr = &mad_send_wr->send_wr; 739 740 if (device->node_type == RDMA_NODE_IB_SWITCH && 741 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 742 port_num = send_wr->wr.ud.port_num; 743 else 744 port_num = mad_agent_priv->agent.port_num; 745 746 /* 747 * Directed route handling starts if the initial LID routed part of 748 * a request or the ending LID routed part of a response is empty. 749 * If we are at the start of the LID routed part, don't update the 750 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec. 751 */ 752 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) == 753 IB_LID_PERMISSIVE && 754 smi_handle_dr_smp_send(smp, device->node_type, port_num) == 755 IB_SMI_DISCARD) { 756 ret = -EINVAL; 757 dev_err(&device->dev, "Invalid directed route\n"); 758 goto out; 759 } 760 761 /* Check to post send on QP or process locally */ 762 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD && 763 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD) 764 goto out; 765 766 local = kmalloc(sizeof *local, GFP_ATOMIC); 767 if (!local) { 768 ret = -ENOMEM; 769 dev_err(&device->dev, "No memory for ib_mad_local_private\n"); 770 goto out; 771 } 772 local->mad_priv = NULL; 773 local->recv_mad_agent = NULL; 774 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC); 775 if (!mad_priv) { 776 ret = -ENOMEM; 777 dev_err(&device->dev, "No memory for local response MAD\n"); 778 kfree(local); 779 goto out; 780 } 781 782 build_smp_wc(mad_agent_priv->agent.qp, 783 send_wr->wr_id, be16_to_cpu(smp->dr_slid), 784 send_wr->wr.ud.pkey_index, 785 send_wr->wr.ud.port_num, &mad_wc); 786 787 /* No GRH for DR SMP */ 788 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL, 789 (struct ib_mad *)smp, 790 (struct ib_mad *)&mad_priv->mad); 791 switch (ret) 792 { 793 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY: 794 if (ib_response_mad(&mad_priv->mad.mad) && 795 mad_agent_priv->agent.recv_handler) { 796 local->mad_priv = mad_priv; 797 local->recv_mad_agent = mad_agent_priv; 798 /* 799 * Reference MAD agent until receive 800 * side of local completion handled 801 */ 802 atomic_inc(&mad_agent_priv->refcount); 803 } else 804 kmem_cache_free(ib_mad_cache, mad_priv); 805 break; 806 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED: 807 kmem_cache_free(ib_mad_cache, mad_priv); 808 break; 809 case IB_MAD_RESULT_SUCCESS: 810 /* Treat like an incoming receive MAD */ 811 port_priv = ib_get_mad_port(mad_agent_priv->agent.device, 812 mad_agent_priv->agent.port_num); 813 if (port_priv) { 814 memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad)); 815 recv_mad_agent = find_mad_agent(port_priv, 816 &mad_priv->mad.mad); 817 } 818 if (!port_priv || !recv_mad_agent) { 819 /* 820 * No receiving agent so drop packet and 821 * generate send completion. 822 */ 823 kmem_cache_free(ib_mad_cache, mad_priv); 824 break; 825 } 826 local->mad_priv = mad_priv; 827 local->recv_mad_agent = recv_mad_agent; 828 break; 829 default: 830 kmem_cache_free(ib_mad_cache, mad_priv); 831 kfree(local); 832 ret = -EINVAL; 833 goto out; 834 } 835 836 local->mad_send_wr = mad_send_wr; 837 /* Reference MAD agent until send side of local completion handled */ 838 atomic_inc(&mad_agent_priv->refcount); 839 /* Queue local completion to local list */ 840 spin_lock_irqsave(&mad_agent_priv->lock, flags); 841 list_add_tail(&local->completion_list, &mad_agent_priv->local_list); 842 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 843 queue_work(mad_agent_priv->qp_info->port_priv->wq, 844 &mad_agent_priv->local_work); 845 ret = 1; 846 out: 847 return ret; 848 } 849 850 static int get_pad_size(int hdr_len, int data_len) 851 { 852 int seg_size, pad; 853 854 seg_size = sizeof(struct ib_mad) - hdr_len; 855 if (data_len && seg_size) { 856 pad = seg_size - data_len % seg_size; 857 return pad == seg_size ? 0 : pad; 858 } else 859 return seg_size; 860 } 861 862 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr) 863 { 864 struct ib_rmpp_segment *s, *t; 865 866 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) { 867 list_del(&s->list); 868 kfree(s); 869 } 870 } 871 872 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr, 873 gfp_t gfp_mask) 874 { 875 struct ib_mad_send_buf *send_buf = &send_wr->send_buf; 876 struct ib_rmpp_mad *rmpp_mad = send_buf->mad; 877 struct ib_rmpp_segment *seg = NULL; 878 int left, seg_size, pad; 879 880 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len; 881 seg_size = send_buf->seg_size; 882 pad = send_wr->pad; 883 884 /* Allocate data segments. */ 885 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) { 886 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask); 887 if (!seg) { 888 dev_err(&send_buf->mad_agent->device->dev, 889 "alloc_send_rmpp_segs: RMPP mem alloc failed for len %zd, gfp %#x\n", 890 sizeof (*seg) + seg_size, gfp_mask); 891 free_send_rmpp_list(send_wr); 892 return -ENOMEM; 893 } 894 seg->num = ++send_buf->seg_count; 895 list_add_tail(&seg->list, &send_wr->rmpp_list); 896 } 897 898 /* Zero any padding */ 899 if (pad) 900 memset(seg->data + seg_size - pad, 0, pad); 901 902 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv-> 903 agent.rmpp_version; 904 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA; 905 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 906 907 send_wr->cur_seg = container_of(send_wr->rmpp_list.next, 908 struct ib_rmpp_segment, list); 909 send_wr->last_ack_seg = send_wr->cur_seg; 910 return 0; 911 } 912 913 int ib_mad_kernel_rmpp_agent(struct ib_mad_agent *agent) 914 { 915 return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP); 916 } 917 EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent); 918 919 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent, 920 u32 remote_qpn, u16 pkey_index, 921 int rmpp_active, 922 int hdr_len, int data_len, 923 gfp_t gfp_mask) 924 { 925 struct ib_mad_agent_private *mad_agent_priv; 926 struct ib_mad_send_wr_private *mad_send_wr; 927 int pad, message_size, ret, size; 928 void *buf; 929 930 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, 931 agent); 932 pad = get_pad_size(hdr_len, data_len); 933 message_size = hdr_len + data_len + pad; 934 935 if (ib_mad_kernel_rmpp_agent(mad_agent)) { 936 if (!rmpp_active && message_size > sizeof(struct ib_mad)) 937 return ERR_PTR(-EINVAL); 938 } else 939 if (rmpp_active || message_size > sizeof(struct ib_mad)) 940 return ERR_PTR(-EINVAL); 941 942 size = rmpp_active ? hdr_len : sizeof(struct ib_mad); 943 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask); 944 if (!buf) 945 return ERR_PTR(-ENOMEM); 946 947 mad_send_wr = buf + size; 948 INIT_LIST_HEAD(&mad_send_wr->rmpp_list); 949 mad_send_wr->send_buf.mad = buf; 950 mad_send_wr->send_buf.hdr_len = hdr_len; 951 mad_send_wr->send_buf.data_len = data_len; 952 mad_send_wr->pad = pad; 953 954 mad_send_wr->mad_agent_priv = mad_agent_priv; 955 mad_send_wr->sg_list[0].length = hdr_len; 956 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey; 957 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len; 958 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey; 959 960 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr; 961 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list; 962 mad_send_wr->send_wr.num_sge = 2; 963 mad_send_wr->send_wr.opcode = IB_WR_SEND; 964 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED; 965 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn; 966 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY; 967 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index; 968 969 if (rmpp_active) { 970 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask); 971 if (ret) { 972 kfree(buf); 973 return ERR_PTR(ret); 974 } 975 } 976 977 mad_send_wr->send_buf.mad_agent = mad_agent; 978 atomic_inc(&mad_agent_priv->refcount); 979 return &mad_send_wr->send_buf; 980 } 981 EXPORT_SYMBOL(ib_create_send_mad); 982 983 int ib_get_mad_data_offset(u8 mgmt_class) 984 { 985 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM) 986 return IB_MGMT_SA_HDR; 987 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) || 988 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) || 989 (mgmt_class == IB_MGMT_CLASS_BIS)) 990 return IB_MGMT_DEVICE_HDR; 991 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && 992 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)) 993 return IB_MGMT_VENDOR_HDR; 994 else 995 return IB_MGMT_MAD_HDR; 996 } 997 EXPORT_SYMBOL(ib_get_mad_data_offset); 998 999 int ib_is_mad_class_rmpp(u8 mgmt_class) 1000 { 1001 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) || 1002 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) || 1003 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) || 1004 (mgmt_class == IB_MGMT_CLASS_BIS) || 1005 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && 1006 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))) 1007 return 1; 1008 return 0; 1009 } 1010 EXPORT_SYMBOL(ib_is_mad_class_rmpp); 1011 1012 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num) 1013 { 1014 struct ib_mad_send_wr_private *mad_send_wr; 1015 struct list_head *list; 1016 1017 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private, 1018 send_buf); 1019 list = &mad_send_wr->cur_seg->list; 1020 1021 if (mad_send_wr->cur_seg->num < seg_num) { 1022 list_for_each_entry(mad_send_wr->cur_seg, list, list) 1023 if (mad_send_wr->cur_seg->num == seg_num) 1024 break; 1025 } else if (mad_send_wr->cur_seg->num > seg_num) { 1026 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list) 1027 if (mad_send_wr->cur_seg->num == seg_num) 1028 break; 1029 } 1030 return mad_send_wr->cur_seg->data; 1031 } 1032 EXPORT_SYMBOL(ib_get_rmpp_segment); 1033 1034 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr) 1035 { 1036 if (mad_send_wr->send_buf.seg_count) 1037 return ib_get_rmpp_segment(&mad_send_wr->send_buf, 1038 mad_send_wr->seg_num); 1039 else 1040 return mad_send_wr->send_buf.mad + 1041 mad_send_wr->send_buf.hdr_len; 1042 } 1043 1044 void ib_free_send_mad(struct ib_mad_send_buf *send_buf) 1045 { 1046 struct ib_mad_agent_private *mad_agent_priv; 1047 struct ib_mad_send_wr_private *mad_send_wr; 1048 1049 mad_agent_priv = container_of(send_buf->mad_agent, 1050 struct ib_mad_agent_private, agent); 1051 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private, 1052 send_buf); 1053 1054 free_send_rmpp_list(mad_send_wr); 1055 kfree(send_buf->mad); 1056 deref_mad_agent(mad_agent_priv); 1057 } 1058 EXPORT_SYMBOL(ib_free_send_mad); 1059 1060 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr) 1061 { 1062 struct ib_mad_qp_info *qp_info; 1063 struct list_head *list; 1064 struct ib_send_wr *bad_send_wr; 1065 struct ib_mad_agent *mad_agent; 1066 struct ib_sge *sge; 1067 unsigned long flags; 1068 int ret; 1069 1070 /* Set WR ID to find mad_send_wr upon completion */ 1071 qp_info = mad_send_wr->mad_agent_priv->qp_info; 1072 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list; 1073 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue; 1074 1075 mad_agent = mad_send_wr->send_buf.mad_agent; 1076 sge = mad_send_wr->sg_list; 1077 sge[0].addr = ib_dma_map_single(mad_agent->device, 1078 mad_send_wr->send_buf.mad, 1079 sge[0].length, 1080 DMA_TO_DEVICE); 1081 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr))) 1082 return -ENOMEM; 1083 1084 mad_send_wr->header_mapping = sge[0].addr; 1085 1086 sge[1].addr = ib_dma_map_single(mad_agent->device, 1087 ib_get_payload(mad_send_wr), 1088 sge[1].length, 1089 DMA_TO_DEVICE); 1090 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) { 1091 ib_dma_unmap_single(mad_agent->device, 1092 mad_send_wr->header_mapping, 1093 sge[0].length, DMA_TO_DEVICE); 1094 return -ENOMEM; 1095 } 1096 mad_send_wr->payload_mapping = sge[1].addr; 1097 1098 spin_lock_irqsave(&qp_info->send_queue.lock, flags); 1099 if (qp_info->send_queue.count < qp_info->send_queue.max_active) { 1100 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr, 1101 &bad_send_wr); 1102 list = &qp_info->send_queue.list; 1103 } else { 1104 ret = 0; 1105 list = &qp_info->overflow_list; 1106 } 1107 1108 if (!ret) { 1109 qp_info->send_queue.count++; 1110 list_add_tail(&mad_send_wr->mad_list.list, list); 1111 } 1112 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); 1113 if (ret) { 1114 ib_dma_unmap_single(mad_agent->device, 1115 mad_send_wr->header_mapping, 1116 sge[0].length, DMA_TO_DEVICE); 1117 ib_dma_unmap_single(mad_agent->device, 1118 mad_send_wr->payload_mapping, 1119 sge[1].length, DMA_TO_DEVICE); 1120 } 1121 return ret; 1122 } 1123 1124 /* 1125 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated 1126 * with the registered client 1127 */ 1128 int ib_post_send_mad(struct ib_mad_send_buf *send_buf, 1129 struct ib_mad_send_buf **bad_send_buf) 1130 { 1131 struct ib_mad_agent_private *mad_agent_priv; 1132 struct ib_mad_send_buf *next_send_buf; 1133 struct ib_mad_send_wr_private *mad_send_wr; 1134 unsigned long flags; 1135 int ret = -EINVAL; 1136 1137 /* Walk list of send WRs and post each on send list */ 1138 for (; send_buf; send_buf = next_send_buf) { 1139 1140 mad_send_wr = container_of(send_buf, 1141 struct ib_mad_send_wr_private, 1142 send_buf); 1143 mad_agent_priv = mad_send_wr->mad_agent_priv; 1144 1145 if (!send_buf->mad_agent->send_handler || 1146 (send_buf->timeout_ms && 1147 !send_buf->mad_agent->recv_handler)) { 1148 ret = -EINVAL; 1149 goto error; 1150 } 1151 1152 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) { 1153 if (mad_agent_priv->agent.rmpp_version) { 1154 ret = -EINVAL; 1155 goto error; 1156 } 1157 } 1158 1159 /* 1160 * Save pointer to next work request to post in case the 1161 * current one completes, and the user modifies the work 1162 * request associated with the completion 1163 */ 1164 next_send_buf = send_buf->next; 1165 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah; 1166 1167 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class == 1168 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 1169 ret = handle_outgoing_dr_smp(mad_agent_priv, 1170 mad_send_wr); 1171 if (ret < 0) /* error */ 1172 goto error; 1173 else if (ret == 1) /* locally consumed */ 1174 continue; 1175 } 1176 1177 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid; 1178 /* Timeout will be updated after send completes */ 1179 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms); 1180 mad_send_wr->max_retries = send_buf->retries; 1181 mad_send_wr->retries_left = send_buf->retries; 1182 send_buf->retries = 0; 1183 /* Reference for work request to QP + response */ 1184 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0); 1185 mad_send_wr->status = IB_WC_SUCCESS; 1186 1187 /* Reference MAD agent until send completes */ 1188 atomic_inc(&mad_agent_priv->refcount); 1189 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1190 list_add_tail(&mad_send_wr->agent_list, 1191 &mad_agent_priv->send_list); 1192 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1193 1194 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) { 1195 ret = ib_send_rmpp_mad(mad_send_wr); 1196 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED) 1197 ret = ib_send_mad(mad_send_wr); 1198 } else 1199 ret = ib_send_mad(mad_send_wr); 1200 if (ret < 0) { 1201 /* Fail send request */ 1202 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1203 list_del(&mad_send_wr->agent_list); 1204 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1205 atomic_dec(&mad_agent_priv->refcount); 1206 goto error; 1207 } 1208 } 1209 return 0; 1210 error: 1211 if (bad_send_buf) 1212 *bad_send_buf = send_buf; 1213 return ret; 1214 } 1215 EXPORT_SYMBOL(ib_post_send_mad); 1216 1217 /* 1218 * ib_free_recv_mad - Returns data buffers used to receive 1219 * a MAD to the access layer 1220 */ 1221 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc) 1222 { 1223 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf; 1224 struct ib_mad_private_header *mad_priv_hdr; 1225 struct ib_mad_private *priv; 1226 struct list_head free_list; 1227 1228 INIT_LIST_HEAD(&free_list); 1229 list_splice_init(&mad_recv_wc->rmpp_list, &free_list); 1230 1231 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf, 1232 &free_list, list) { 1233 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc, 1234 recv_buf); 1235 mad_priv_hdr = container_of(mad_recv_wc, 1236 struct ib_mad_private_header, 1237 recv_wc); 1238 priv = container_of(mad_priv_hdr, struct ib_mad_private, 1239 header); 1240 kmem_cache_free(ib_mad_cache, priv); 1241 } 1242 } 1243 EXPORT_SYMBOL(ib_free_recv_mad); 1244 1245 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp, 1246 u8 rmpp_version, 1247 ib_mad_send_handler send_handler, 1248 ib_mad_recv_handler recv_handler, 1249 void *context) 1250 { 1251 return ERR_PTR(-EINVAL); /* XXX: for now */ 1252 } 1253 EXPORT_SYMBOL(ib_redirect_mad_qp); 1254 1255 int ib_process_mad_wc(struct ib_mad_agent *mad_agent, 1256 struct ib_wc *wc) 1257 { 1258 dev_err(&mad_agent->device->dev, 1259 "ib_process_mad_wc() not implemented yet\n"); 1260 return 0; 1261 } 1262 EXPORT_SYMBOL(ib_process_mad_wc); 1263 1264 static int method_in_use(struct ib_mad_mgmt_method_table **method, 1265 struct ib_mad_reg_req *mad_reg_req) 1266 { 1267 int i; 1268 1269 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) { 1270 if ((*method)->agent[i]) { 1271 pr_err("Method %d already in use\n", i); 1272 return -EINVAL; 1273 } 1274 } 1275 return 0; 1276 } 1277 1278 static int allocate_method_table(struct ib_mad_mgmt_method_table **method) 1279 { 1280 /* Allocate management method table */ 1281 *method = kzalloc(sizeof **method, GFP_ATOMIC); 1282 if (!*method) { 1283 pr_err("No memory for ib_mad_mgmt_method_table\n"); 1284 return -ENOMEM; 1285 } 1286 1287 return 0; 1288 } 1289 1290 /* 1291 * Check to see if there are any methods still in use 1292 */ 1293 static int check_method_table(struct ib_mad_mgmt_method_table *method) 1294 { 1295 int i; 1296 1297 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) 1298 if (method->agent[i]) 1299 return 1; 1300 return 0; 1301 } 1302 1303 /* 1304 * Check to see if there are any method tables for this class still in use 1305 */ 1306 static int check_class_table(struct ib_mad_mgmt_class_table *class) 1307 { 1308 int i; 1309 1310 for (i = 0; i < MAX_MGMT_CLASS; i++) 1311 if (class->method_table[i]) 1312 return 1; 1313 return 0; 1314 } 1315 1316 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class) 1317 { 1318 int i; 1319 1320 for (i = 0; i < MAX_MGMT_OUI; i++) 1321 if (vendor_class->method_table[i]) 1322 return 1; 1323 return 0; 1324 } 1325 1326 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class, 1327 char *oui) 1328 { 1329 int i; 1330 1331 for (i = 0; i < MAX_MGMT_OUI; i++) 1332 /* Is there matching OUI for this vendor class ? */ 1333 if (!memcmp(vendor_class->oui[i], oui, 3)) 1334 return i; 1335 1336 return -1; 1337 } 1338 1339 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor) 1340 { 1341 int i; 1342 1343 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++) 1344 if (vendor->vendor_class[i]) 1345 return 1; 1346 1347 return 0; 1348 } 1349 1350 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method, 1351 struct ib_mad_agent_private *agent) 1352 { 1353 int i; 1354 1355 /* Remove any methods for this mad agent */ 1356 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) { 1357 if (method->agent[i] == agent) { 1358 method->agent[i] = NULL; 1359 } 1360 } 1361 } 1362 1363 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req, 1364 struct ib_mad_agent_private *agent_priv, 1365 u8 mgmt_class) 1366 { 1367 struct ib_mad_port_private *port_priv; 1368 struct ib_mad_mgmt_class_table **class; 1369 struct ib_mad_mgmt_method_table **method; 1370 int i, ret; 1371 1372 port_priv = agent_priv->qp_info->port_priv; 1373 class = &port_priv->version[mad_reg_req->mgmt_class_version].class; 1374 if (!*class) { 1375 /* Allocate management class table for "new" class version */ 1376 *class = kzalloc(sizeof **class, GFP_ATOMIC); 1377 if (!*class) { 1378 dev_err(&agent_priv->agent.device->dev, 1379 "No memory for ib_mad_mgmt_class_table\n"); 1380 ret = -ENOMEM; 1381 goto error1; 1382 } 1383 1384 /* Allocate method table for this management class */ 1385 method = &(*class)->method_table[mgmt_class]; 1386 if ((ret = allocate_method_table(method))) 1387 goto error2; 1388 } else { 1389 method = &(*class)->method_table[mgmt_class]; 1390 if (!*method) { 1391 /* Allocate method table for this management class */ 1392 if ((ret = allocate_method_table(method))) 1393 goto error1; 1394 } 1395 } 1396 1397 /* Now, make sure methods are not already in use */ 1398 if (method_in_use(method, mad_reg_req)) 1399 goto error3; 1400 1401 /* Finally, add in methods being registered */ 1402 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) 1403 (*method)->agent[i] = agent_priv; 1404 1405 return 0; 1406 1407 error3: 1408 /* Remove any methods for this mad agent */ 1409 remove_methods_mad_agent(*method, agent_priv); 1410 /* Now, check to see if there are any methods in use */ 1411 if (!check_method_table(*method)) { 1412 /* If not, release management method table */ 1413 kfree(*method); 1414 *method = NULL; 1415 } 1416 ret = -EINVAL; 1417 goto error1; 1418 error2: 1419 kfree(*class); 1420 *class = NULL; 1421 error1: 1422 return ret; 1423 } 1424 1425 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req, 1426 struct ib_mad_agent_private *agent_priv) 1427 { 1428 struct ib_mad_port_private *port_priv; 1429 struct ib_mad_mgmt_vendor_class_table **vendor_table; 1430 struct ib_mad_mgmt_vendor_class_table *vendor = NULL; 1431 struct ib_mad_mgmt_vendor_class *vendor_class = NULL; 1432 struct ib_mad_mgmt_method_table **method; 1433 int i, ret = -ENOMEM; 1434 u8 vclass; 1435 1436 /* "New" vendor (with OUI) class */ 1437 vclass = vendor_class_index(mad_reg_req->mgmt_class); 1438 port_priv = agent_priv->qp_info->port_priv; 1439 vendor_table = &port_priv->version[ 1440 mad_reg_req->mgmt_class_version].vendor; 1441 if (!*vendor_table) { 1442 /* Allocate mgmt vendor class table for "new" class version */ 1443 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC); 1444 if (!vendor) { 1445 dev_err(&agent_priv->agent.device->dev, 1446 "No memory for ib_mad_mgmt_vendor_class_table\n"); 1447 goto error1; 1448 } 1449 1450 *vendor_table = vendor; 1451 } 1452 if (!(*vendor_table)->vendor_class[vclass]) { 1453 /* Allocate table for this management vendor class */ 1454 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC); 1455 if (!vendor_class) { 1456 dev_err(&agent_priv->agent.device->dev, 1457 "No memory for ib_mad_mgmt_vendor_class\n"); 1458 goto error2; 1459 } 1460 1461 (*vendor_table)->vendor_class[vclass] = vendor_class; 1462 } 1463 for (i = 0; i < MAX_MGMT_OUI; i++) { 1464 /* Is there matching OUI for this vendor class ? */ 1465 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i], 1466 mad_reg_req->oui, 3)) { 1467 method = &(*vendor_table)->vendor_class[ 1468 vclass]->method_table[i]; 1469 BUG_ON(!*method); 1470 goto check_in_use; 1471 } 1472 } 1473 for (i = 0; i < MAX_MGMT_OUI; i++) { 1474 /* OUI slot available ? */ 1475 if (!is_vendor_oui((*vendor_table)->vendor_class[ 1476 vclass]->oui[i])) { 1477 method = &(*vendor_table)->vendor_class[ 1478 vclass]->method_table[i]; 1479 BUG_ON(*method); 1480 /* Allocate method table for this OUI */ 1481 if ((ret = allocate_method_table(method))) 1482 goto error3; 1483 memcpy((*vendor_table)->vendor_class[vclass]->oui[i], 1484 mad_reg_req->oui, 3); 1485 goto check_in_use; 1486 } 1487 } 1488 dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n"); 1489 goto error3; 1490 1491 check_in_use: 1492 /* Now, make sure methods are not already in use */ 1493 if (method_in_use(method, mad_reg_req)) 1494 goto error4; 1495 1496 /* Finally, add in methods being registered */ 1497 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) 1498 (*method)->agent[i] = agent_priv; 1499 1500 return 0; 1501 1502 error4: 1503 /* Remove any methods for this mad agent */ 1504 remove_methods_mad_agent(*method, agent_priv); 1505 /* Now, check to see if there are any methods in use */ 1506 if (!check_method_table(*method)) { 1507 /* If not, release management method table */ 1508 kfree(*method); 1509 *method = NULL; 1510 } 1511 ret = -EINVAL; 1512 error3: 1513 if (vendor_class) { 1514 (*vendor_table)->vendor_class[vclass] = NULL; 1515 kfree(vendor_class); 1516 } 1517 error2: 1518 if (vendor) { 1519 *vendor_table = NULL; 1520 kfree(vendor); 1521 } 1522 error1: 1523 return ret; 1524 } 1525 1526 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv) 1527 { 1528 struct ib_mad_port_private *port_priv; 1529 struct ib_mad_mgmt_class_table *class; 1530 struct ib_mad_mgmt_method_table *method; 1531 struct ib_mad_mgmt_vendor_class_table *vendor; 1532 struct ib_mad_mgmt_vendor_class *vendor_class; 1533 int index; 1534 u8 mgmt_class; 1535 1536 /* 1537 * Was MAD registration request supplied 1538 * with original registration ? 1539 */ 1540 if (!agent_priv->reg_req) { 1541 goto out; 1542 } 1543 1544 port_priv = agent_priv->qp_info->port_priv; 1545 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class); 1546 class = port_priv->version[ 1547 agent_priv->reg_req->mgmt_class_version].class; 1548 if (!class) 1549 goto vendor_check; 1550 1551 method = class->method_table[mgmt_class]; 1552 if (method) { 1553 /* Remove any methods for this mad agent */ 1554 remove_methods_mad_agent(method, agent_priv); 1555 /* Now, check to see if there are any methods still in use */ 1556 if (!check_method_table(method)) { 1557 /* If not, release management method table */ 1558 kfree(method); 1559 class->method_table[mgmt_class] = NULL; 1560 /* Any management classes left ? */ 1561 if (!check_class_table(class)) { 1562 /* If not, release management class table */ 1563 kfree(class); 1564 port_priv->version[ 1565 agent_priv->reg_req-> 1566 mgmt_class_version].class = NULL; 1567 } 1568 } 1569 } 1570 1571 vendor_check: 1572 if (!is_vendor_class(mgmt_class)) 1573 goto out; 1574 1575 /* normalize mgmt_class to vendor range 2 */ 1576 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class); 1577 vendor = port_priv->version[ 1578 agent_priv->reg_req->mgmt_class_version].vendor; 1579 1580 if (!vendor) 1581 goto out; 1582 1583 vendor_class = vendor->vendor_class[mgmt_class]; 1584 if (vendor_class) { 1585 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui); 1586 if (index < 0) 1587 goto out; 1588 method = vendor_class->method_table[index]; 1589 if (method) { 1590 /* Remove any methods for this mad agent */ 1591 remove_methods_mad_agent(method, agent_priv); 1592 /* 1593 * Now, check to see if there are 1594 * any methods still in use 1595 */ 1596 if (!check_method_table(method)) { 1597 /* If not, release management method table */ 1598 kfree(method); 1599 vendor_class->method_table[index] = NULL; 1600 memset(vendor_class->oui[index], 0, 3); 1601 /* Any OUIs left ? */ 1602 if (!check_vendor_class(vendor_class)) { 1603 /* If not, release vendor class table */ 1604 kfree(vendor_class); 1605 vendor->vendor_class[mgmt_class] = NULL; 1606 /* Any other vendor classes left ? */ 1607 if (!check_vendor_table(vendor)) { 1608 kfree(vendor); 1609 port_priv->version[ 1610 agent_priv->reg_req-> 1611 mgmt_class_version]. 1612 vendor = NULL; 1613 } 1614 } 1615 } 1616 } 1617 } 1618 1619 out: 1620 return; 1621 } 1622 1623 static struct ib_mad_agent_private * 1624 find_mad_agent(struct ib_mad_port_private *port_priv, 1625 struct ib_mad *mad) 1626 { 1627 struct ib_mad_agent_private *mad_agent = NULL; 1628 unsigned long flags; 1629 1630 spin_lock_irqsave(&port_priv->reg_lock, flags); 1631 if (ib_response_mad(mad)) { 1632 u32 hi_tid; 1633 struct ib_mad_agent_private *entry; 1634 1635 /* 1636 * Routing is based on high 32 bits of transaction ID 1637 * of MAD. 1638 */ 1639 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32; 1640 list_for_each_entry(entry, &port_priv->agent_list, agent_list) { 1641 if (entry->agent.hi_tid == hi_tid) { 1642 mad_agent = entry; 1643 break; 1644 } 1645 } 1646 } else { 1647 struct ib_mad_mgmt_class_table *class; 1648 struct ib_mad_mgmt_method_table *method; 1649 struct ib_mad_mgmt_vendor_class_table *vendor; 1650 struct ib_mad_mgmt_vendor_class *vendor_class; 1651 struct ib_vendor_mad *vendor_mad; 1652 int index; 1653 1654 /* 1655 * Routing is based on version, class, and method 1656 * For "newer" vendor MADs, also based on OUI 1657 */ 1658 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION) 1659 goto out; 1660 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) { 1661 class = port_priv->version[ 1662 mad->mad_hdr.class_version].class; 1663 if (!class) 1664 goto out; 1665 if (convert_mgmt_class(mad->mad_hdr.mgmt_class) >= 1666 IB_MGMT_MAX_METHODS) 1667 goto out; 1668 method = class->method_table[convert_mgmt_class( 1669 mad->mad_hdr.mgmt_class)]; 1670 if (method) 1671 mad_agent = method->agent[mad->mad_hdr.method & 1672 ~IB_MGMT_METHOD_RESP]; 1673 } else { 1674 vendor = port_priv->version[ 1675 mad->mad_hdr.class_version].vendor; 1676 if (!vendor) 1677 goto out; 1678 vendor_class = vendor->vendor_class[vendor_class_index( 1679 mad->mad_hdr.mgmt_class)]; 1680 if (!vendor_class) 1681 goto out; 1682 /* Find matching OUI */ 1683 vendor_mad = (struct ib_vendor_mad *)mad; 1684 index = find_vendor_oui(vendor_class, vendor_mad->oui); 1685 if (index == -1) 1686 goto out; 1687 method = vendor_class->method_table[index]; 1688 if (method) { 1689 mad_agent = method->agent[mad->mad_hdr.method & 1690 ~IB_MGMT_METHOD_RESP]; 1691 } 1692 } 1693 } 1694 1695 if (mad_agent) { 1696 if (mad_agent->agent.recv_handler) 1697 atomic_inc(&mad_agent->refcount); 1698 else { 1699 dev_notice(&port_priv->device->dev, 1700 "No receive handler for client %p on port %d\n", 1701 &mad_agent->agent, port_priv->port_num); 1702 mad_agent = NULL; 1703 } 1704 } 1705 out: 1706 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 1707 1708 return mad_agent; 1709 } 1710 1711 static int validate_mad(struct ib_mad *mad, u32 qp_num) 1712 { 1713 int valid = 0; 1714 1715 /* Make sure MAD base version is understood */ 1716 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) { 1717 pr_err("MAD received with unsupported base version %d\n", 1718 mad->mad_hdr.base_version); 1719 goto out; 1720 } 1721 1722 /* Filter SMI packets sent to other than QP0 */ 1723 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) || 1724 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) { 1725 if (qp_num == 0) 1726 valid = 1; 1727 } else { 1728 /* Filter GSI packets sent to QP0 */ 1729 if (qp_num != 0) 1730 valid = 1; 1731 } 1732 1733 out: 1734 return valid; 1735 } 1736 1737 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv, 1738 struct ib_mad_hdr *mad_hdr) 1739 { 1740 struct ib_rmpp_mad *rmpp_mad; 1741 1742 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr; 1743 return !mad_agent_priv->agent.rmpp_version || 1744 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) || 1745 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 1746 IB_MGMT_RMPP_FLAG_ACTIVE) || 1747 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA); 1748 } 1749 1750 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr, 1751 struct ib_mad_recv_wc *rwc) 1752 { 1753 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class == 1754 rwc->recv_buf.mad->mad_hdr.mgmt_class; 1755 } 1756 1757 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv, 1758 struct ib_mad_send_wr_private *wr, 1759 struct ib_mad_recv_wc *rwc ) 1760 { 1761 struct ib_ah_attr attr; 1762 u8 send_resp, rcv_resp; 1763 union ib_gid sgid; 1764 struct ib_device *device = mad_agent_priv->agent.device; 1765 u8 port_num = mad_agent_priv->agent.port_num; 1766 u8 lmc; 1767 1768 send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad); 1769 rcv_resp = ib_response_mad(rwc->recv_buf.mad); 1770 1771 if (send_resp == rcv_resp) 1772 /* both requests, or both responses. GIDs different */ 1773 return 0; 1774 1775 if (ib_query_ah(wr->send_buf.ah, &attr)) 1776 /* Assume not equal, to avoid false positives. */ 1777 return 0; 1778 1779 if (!!(attr.ah_flags & IB_AH_GRH) != 1780 !!(rwc->wc->wc_flags & IB_WC_GRH)) 1781 /* one has GID, other does not. Assume different */ 1782 return 0; 1783 1784 if (!send_resp && rcv_resp) { 1785 /* is request/response. */ 1786 if (!(attr.ah_flags & IB_AH_GRH)) { 1787 if (ib_get_cached_lmc(device, port_num, &lmc)) 1788 return 0; 1789 return (!lmc || !((attr.src_path_bits ^ 1790 rwc->wc->dlid_path_bits) & 1791 ((1 << lmc) - 1))); 1792 } else { 1793 if (ib_get_cached_gid(device, port_num, 1794 attr.grh.sgid_index, &sgid)) 1795 return 0; 1796 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw, 1797 16); 1798 } 1799 } 1800 1801 if (!(attr.ah_flags & IB_AH_GRH)) 1802 return attr.dlid == rwc->wc->slid; 1803 else 1804 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw, 1805 16); 1806 } 1807 1808 static inline int is_direct(u8 class) 1809 { 1810 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE); 1811 } 1812 1813 struct ib_mad_send_wr_private* 1814 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv, 1815 struct ib_mad_recv_wc *wc) 1816 { 1817 struct ib_mad_send_wr_private *wr; 1818 struct ib_mad *mad; 1819 1820 mad = (struct ib_mad *)wc->recv_buf.mad; 1821 1822 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) { 1823 if ((wr->tid == mad->mad_hdr.tid) && 1824 rcv_has_same_class(wr, wc) && 1825 /* 1826 * Don't check GID for direct routed MADs. 1827 * These might have permissive LIDs. 1828 */ 1829 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) || 1830 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1831 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1832 } 1833 1834 /* 1835 * It's possible to receive the response before we've 1836 * been notified that the send has completed 1837 */ 1838 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) { 1839 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) && 1840 wr->tid == mad->mad_hdr.tid && 1841 wr->timeout && 1842 rcv_has_same_class(wr, wc) && 1843 /* 1844 * Don't check GID for direct routed MADs. 1845 * These might have permissive LIDs. 1846 */ 1847 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) || 1848 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1849 /* Verify request has not been canceled */ 1850 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1851 } 1852 return NULL; 1853 } 1854 1855 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr) 1856 { 1857 mad_send_wr->timeout = 0; 1858 if (mad_send_wr->refcount == 1) 1859 list_move_tail(&mad_send_wr->agent_list, 1860 &mad_send_wr->mad_agent_priv->done_list); 1861 } 1862 1863 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv, 1864 struct ib_mad_recv_wc *mad_recv_wc) 1865 { 1866 struct ib_mad_send_wr_private *mad_send_wr; 1867 struct ib_mad_send_wc mad_send_wc; 1868 unsigned long flags; 1869 1870 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list); 1871 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list); 1872 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) { 1873 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv, 1874 mad_recv_wc); 1875 if (!mad_recv_wc) { 1876 deref_mad_agent(mad_agent_priv); 1877 return; 1878 } 1879 } 1880 1881 /* Complete corresponding request */ 1882 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) { 1883 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1884 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc); 1885 if (!mad_send_wr) { 1886 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1887 if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) 1888 && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class) 1889 && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr) 1890 & IB_MGMT_RMPP_FLAG_ACTIVE)) { 1891 /* user rmpp is in effect 1892 * and this is an active RMPP MAD 1893 */ 1894 mad_recv_wc->wc->wr_id = 0; 1895 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, 1896 mad_recv_wc); 1897 atomic_dec(&mad_agent_priv->refcount); 1898 } else { 1899 /* not user rmpp, revert to normal behavior and 1900 * drop the mad */ 1901 ib_free_recv_mad(mad_recv_wc); 1902 deref_mad_agent(mad_agent_priv); 1903 return; 1904 } 1905 } else { 1906 ib_mark_mad_done(mad_send_wr); 1907 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1908 1909 /* Defined behavior is to complete response before request */ 1910 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf; 1911 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, 1912 mad_recv_wc); 1913 atomic_dec(&mad_agent_priv->refcount); 1914 1915 mad_send_wc.status = IB_WC_SUCCESS; 1916 mad_send_wc.vendor_err = 0; 1917 mad_send_wc.send_buf = &mad_send_wr->send_buf; 1918 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 1919 } 1920 } else { 1921 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, 1922 mad_recv_wc); 1923 deref_mad_agent(mad_agent_priv); 1924 } 1925 } 1926 1927 static bool generate_unmatched_resp(struct ib_mad_private *recv, 1928 struct ib_mad_private *response) 1929 { 1930 if (recv->mad.mad.mad_hdr.method == IB_MGMT_METHOD_GET || 1931 recv->mad.mad.mad_hdr.method == IB_MGMT_METHOD_SET) { 1932 memcpy(response, recv, sizeof *response); 1933 response->header.recv_wc.wc = &response->header.wc; 1934 response->header.recv_wc.recv_buf.mad = &response->mad.mad; 1935 response->header.recv_wc.recv_buf.grh = &response->grh; 1936 response->mad.mad.mad_hdr.method = IB_MGMT_METHOD_GET_RESP; 1937 response->mad.mad.mad_hdr.status = 1938 cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB); 1939 if (recv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 1940 response->mad.mad.mad_hdr.status |= IB_SMP_DIRECTION; 1941 1942 return true; 1943 } else { 1944 return false; 1945 } 1946 } 1947 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv, 1948 struct ib_wc *wc) 1949 { 1950 struct ib_mad_qp_info *qp_info; 1951 struct ib_mad_private_header *mad_priv_hdr; 1952 struct ib_mad_private *recv, *response = NULL; 1953 struct ib_mad_list_head *mad_list; 1954 struct ib_mad_agent_private *mad_agent; 1955 int port_num; 1956 int ret = IB_MAD_RESULT_SUCCESS; 1957 1958 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 1959 qp_info = mad_list->mad_queue->qp_info; 1960 dequeue_mad(mad_list); 1961 1962 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header, 1963 mad_list); 1964 recv = container_of(mad_priv_hdr, struct ib_mad_private, header); 1965 ib_dma_unmap_single(port_priv->device, 1966 recv->header.mapping, 1967 sizeof(struct ib_mad_private) - 1968 sizeof(struct ib_mad_private_header), 1969 DMA_FROM_DEVICE); 1970 1971 /* Setup MAD receive work completion from "normal" work completion */ 1972 recv->header.wc = *wc; 1973 recv->header.recv_wc.wc = &recv->header.wc; 1974 recv->header.recv_wc.mad_len = sizeof(struct ib_mad); 1975 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad; 1976 recv->header.recv_wc.recv_buf.grh = &recv->grh; 1977 1978 if (atomic_read(&qp_info->snoop_count)) 1979 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS); 1980 1981 /* Validate MAD */ 1982 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num)) 1983 goto out; 1984 1985 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL); 1986 if (!response) { 1987 dev_err(&port_priv->device->dev, 1988 "ib_mad_recv_done_handler no memory for response buffer\n"); 1989 goto out; 1990 } 1991 1992 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) 1993 port_num = wc->port_num; 1994 else 1995 port_num = port_priv->port_num; 1996 1997 if (recv->mad.mad.mad_hdr.mgmt_class == 1998 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 1999 enum smi_forward_action retsmi; 2000 2001 if (smi_handle_dr_smp_recv(&recv->mad.smp, 2002 port_priv->device->node_type, 2003 port_num, 2004 port_priv->device->phys_port_cnt) == 2005 IB_SMI_DISCARD) 2006 goto out; 2007 2008 retsmi = smi_check_forward_dr_smp(&recv->mad.smp); 2009 if (retsmi == IB_SMI_LOCAL) 2010 goto local; 2011 2012 if (retsmi == IB_SMI_SEND) { /* don't forward */ 2013 if (smi_handle_dr_smp_send(&recv->mad.smp, 2014 port_priv->device->node_type, 2015 port_num) == IB_SMI_DISCARD) 2016 goto out; 2017 2018 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD) 2019 goto out; 2020 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) { 2021 /* forward case for switches */ 2022 memcpy(response, recv, sizeof(*response)); 2023 response->header.recv_wc.wc = &response->header.wc; 2024 response->header.recv_wc.recv_buf.mad = &response->mad.mad; 2025 response->header.recv_wc.recv_buf.grh = &response->grh; 2026 2027 agent_send_response(&response->mad.mad, 2028 &response->grh, wc, 2029 port_priv->device, 2030 smi_get_fwd_port(&recv->mad.smp), 2031 qp_info->qp->qp_num); 2032 2033 goto out; 2034 } 2035 } 2036 2037 local: 2038 /* Give driver "right of first refusal" on incoming MAD */ 2039 if (port_priv->device->process_mad) { 2040 ret = port_priv->device->process_mad(port_priv->device, 0, 2041 port_priv->port_num, 2042 wc, &recv->grh, 2043 &recv->mad.mad, 2044 &response->mad.mad); 2045 if (ret & IB_MAD_RESULT_SUCCESS) { 2046 if (ret & IB_MAD_RESULT_CONSUMED) 2047 goto out; 2048 if (ret & IB_MAD_RESULT_REPLY) { 2049 agent_send_response(&response->mad.mad, 2050 &recv->grh, wc, 2051 port_priv->device, 2052 port_num, 2053 qp_info->qp->qp_num); 2054 goto out; 2055 } 2056 } 2057 } 2058 2059 mad_agent = find_mad_agent(port_priv, &recv->mad.mad); 2060 if (mad_agent) { 2061 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc); 2062 /* 2063 * recv is freed up in error cases in ib_mad_complete_recv 2064 * or via recv_handler in ib_mad_complete_recv() 2065 */ 2066 recv = NULL; 2067 } else if ((ret & IB_MAD_RESULT_SUCCESS) && 2068 generate_unmatched_resp(recv, response)) { 2069 agent_send_response(&response->mad.mad, &recv->grh, wc, 2070 port_priv->device, port_num, qp_info->qp->qp_num); 2071 } 2072 2073 out: 2074 /* Post another receive request for this QP */ 2075 if (response) { 2076 ib_mad_post_receive_mads(qp_info, response); 2077 if (recv) 2078 kmem_cache_free(ib_mad_cache, recv); 2079 } else 2080 ib_mad_post_receive_mads(qp_info, recv); 2081 } 2082 2083 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv) 2084 { 2085 struct ib_mad_send_wr_private *mad_send_wr; 2086 unsigned long delay; 2087 2088 if (list_empty(&mad_agent_priv->wait_list)) { 2089 cancel_delayed_work(&mad_agent_priv->timed_work); 2090 } else { 2091 mad_send_wr = list_entry(mad_agent_priv->wait_list.next, 2092 struct ib_mad_send_wr_private, 2093 agent_list); 2094 2095 if (time_after(mad_agent_priv->timeout, 2096 mad_send_wr->timeout)) { 2097 mad_agent_priv->timeout = mad_send_wr->timeout; 2098 delay = mad_send_wr->timeout - jiffies; 2099 if ((long)delay <= 0) 2100 delay = 1; 2101 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq, 2102 &mad_agent_priv->timed_work, delay); 2103 } 2104 } 2105 } 2106 2107 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr) 2108 { 2109 struct ib_mad_agent_private *mad_agent_priv; 2110 struct ib_mad_send_wr_private *temp_mad_send_wr; 2111 struct list_head *list_item; 2112 unsigned long delay; 2113 2114 mad_agent_priv = mad_send_wr->mad_agent_priv; 2115 list_del(&mad_send_wr->agent_list); 2116 2117 delay = mad_send_wr->timeout; 2118 mad_send_wr->timeout += jiffies; 2119 2120 if (delay) { 2121 list_for_each_prev(list_item, &mad_agent_priv->wait_list) { 2122 temp_mad_send_wr = list_entry(list_item, 2123 struct ib_mad_send_wr_private, 2124 agent_list); 2125 if (time_after(mad_send_wr->timeout, 2126 temp_mad_send_wr->timeout)) 2127 break; 2128 } 2129 } 2130 else 2131 list_item = &mad_agent_priv->wait_list; 2132 list_add(&mad_send_wr->agent_list, list_item); 2133 2134 /* Reschedule a work item if we have a shorter timeout */ 2135 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) 2136 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq, 2137 &mad_agent_priv->timed_work, delay); 2138 } 2139 2140 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr, 2141 int timeout_ms) 2142 { 2143 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2144 wait_for_response(mad_send_wr); 2145 } 2146 2147 /* 2148 * Process a send work completion 2149 */ 2150 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr, 2151 struct ib_mad_send_wc *mad_send_wc) 2152 { 2153 struct ib_mad_agent_private *mad_agent_priv; 2154 unsigned long flags; 2155 int ret; 2156 2157 mad_agent_priv = mad_send_wr->mad_agent_priv; 2158 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2159 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) { 2160 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc); 2161 if (ret == IB_RMPP_RESULT_CONSUMED) 2162 goto done; 2163 } else 2164 ret = IB_RMPP_RESULT_UNHANDLED; 2165 2166 if (mad_send_wc->status != IB_WC_SUCCESS && 2167 mad_send_wr->status == IB_WC_SUCCESS) { 2168 mad_send_wr->status = mad_send_wc->status; 2169 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2170 } 2171 2172 if (--mad_send_wr->refcount > 0) { 2173 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout && 2174 mad_send_wr->status == IB_WC_SUCCESS) { 2175 wait_for_response(mad_send_wr); 2176 } 2177 goto done; 2178 } 2179 2180 /* Remove send from MAD agent and notify client of completion */ 2181 list_del(&mad_send_wr->agent_list); 2182 adjust_timeout(mad_agent_priv); 2183 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2184 2185 if (mad_send_wr->status != IB_WC_SUCCESS ) 2186 mad_send_wc->status = mad_send_wr->status; 2187 if (ret == IB_RMPP_RESULT_INTERNAL) 2188 ib_rmpp_send_handler(mad_send_wc); 2189 else 2190 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2191 mad_send_wc); 2192 2193 /* Release reference on agent taken when sending */ 2194 deref_mad_agent(mad_agent_priv); 2195 return; 2196 done: 2197 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2198 } 2199 2200 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv, 2201 struct ib_wc *wc) 2202 { 2203 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr; 2204 struct ib_mad_list_head *mad_list; 2205 struct ib_mad_qp_info *qp_info; 2206 struct ib_mad_queue *send_queue; 2207 struct ib_send_wr *bad_send_wr; 2208 struct ib_mad_send_wc mad_send_wc; 2209 unsigned long flags; 2210 int ret; 2211 2212 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 2213 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2214 mad_list); 2215 send_queue = mad_list->mad_queue; 2216 qp_info = send_queue->qp_info; 2217 2218 retry: 2219 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2220 mad_send_wr->header_mapping, 2221 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE); 2222 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2223 mad_send_wr->payload_mapping, 2224 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE); 2225 queued_send_wr = NULL; 2226 spin_lock_irqsave(&send_queue->lock, flags); 2227 list_del(&mad_list->list); 2228 2229 /* Move queued send to the send queue */ 2230 if (send_queue->count-- > send_queue->max_active) { 2231 mad_list = container_of(qp_info->overflow_list.next, 2232 struct ib_mad_list_head, list); 2233 queued_send_wr = container_of(mad_list, 2234 struct ib_mad_send_wr_private, 2235 mad_list); 2236 list_move_tail(&mad_list->list, &send_queue->list); 2237 } 2238 spin_unlock_irqrestore(&send_queue->lock, flags); 2239 2240 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2241 mad_send_wc.status = wc->status; 2242 mad_send_wc.vendor_err = wc->vendor_err; 2243 if (atomic_read(&qp_info->snoop_count)) 2244 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc, 2245 IB_MAD_SNOOP_SEND_COMPLETIONS); 2246 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 2247 2248 if (queued_send_wr) { 2249 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr, 2250 &bad_send_wr); 2251 if (ret) { 2252 dev_err(&port_priv->device->dev, 2253 "ib_post_send failed: %d\n", ret); 2254 mad_send_wr = queued_send_wr; 2255 wc->status = IB_WC_LOC_QP_OP_ERR; 2256 goto retry; 2257 } 2258 } 2259 } 2260 2261 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info) 2262 { 2263 struct ib_mad_send_wr_private *mad_send_wr; 2264 struct ib_mad_list_head *mad_list; 2265 unsigned long flags; 2266 2267 spin_lock_irqsave(&qp_info->send_queue.lock, flags); 2268 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) { 2269 mad_send_wr = container_of(mad_list, 2270 struct ib_mad_send_wr_private, 2271 mad_list); 2272 mad_send_wr->retry = 1; 2273 } 2274 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); 2275 } 2276 2277 static void mad_error_handler(struct ib_mad_port_private *port_priv, 2278 struct ib_wc *wc) 2279 { 2280 struct ib_mad_list_head *mad_list; 2281 struct ib_mad_qp_info *qp_info; 2282 struct ib_mad_send_wr_private *mad_send_wr; 2283 int ret; 2284 2285 /* Determine if failure was a send or receive */ 2286 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; 2287 qp_info = mad_list->mad_queue->qp_info; 2288 if (mad_list->mad_queue == &qp_info->recv_queue) 2289 /* 2290 * Receive errors indicate that the QP has entered the error 2291 * state - error handling/shutdown code will cleanup 2292 */ 2293 return; 2294 2295 /* 2296 * Send errors will transition the QP to SQE - move 2297 * QP to RTS and repost flushed work requests 2298 */ 2299 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2300 mad_list); 2301 if (wc->status == IB_WC_WR_FLUSH_ERR) { 2302 if (mad_send_wr->retry) { 2303 /* Repost send */ 2304 struct ib_send_wr *bad_send_wr; 2305 2306 mad_send_wr->retry = 0; 2307 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr, 2308 &bad_send_wr); 2309 if (ret) 2310 ib_mad_send_done_handler(port_priv, wc); 2311 } else 2312 ib_mad_send_done_handler(port_priv, wc); 2313 } else { 2314 struct ib_qp_attr *attr; 2315 2316 /* Transition QP to RTS and fail offending send */ 2317 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2318 if (attr) { 2319 attr->qp_state = IB_QPS_RTS; 2320 attr->cur_qp_state = IB_QPS_SQE; 2321 ret = ib_modify_qp(qp_info->qp, attr, 2322 IB_QP_STATE | IB_QP_CUR_STATE); 2323 kfree(attr); 2324 if (ret) 2325 dev_err(&port_priv->device->dev, 2326 "mad_error_handler - ib_modify_qp to RTS : %d\n", 2327 ret); 2328 else 2329 mark_sends_for_retry(qp_info); 2330 } 2331 ib_mad_send_done_handler(port_priv, wc); 2332 } 2333 } 2334 2335 /* 2336 * IB MAD completion callback 2337 */ 2338 static void ib_mad_completion_handler(struct work_struct *work) 2339 { 2340 struct ib_mad_port_private *port_priv; 2341 struct ib_wc wc; 2342 2343 port_priv = container_of(work, struct ib_mad_port_private, work); 2344 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); 2345 2346 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) { 2347 if (wc.status == IB_WC_SUCCESS) { 2348 switch (wc.opcode) { 2349 case IB_WC_SEND: 2350 ib_mad_send_done_handler(port_priv, &wc); 2351 break; 2352 case IB_WC_RECV: 2353 ib_mad_recv_done_handler(port_priv, &wc); 2354 break; 2355 default: 2356 BUG_ON(1); 2357 break; 2358 } 2359 } else 2360 mad_error_handler(port_priv, &wc); 2361 } 2362 } 2363 2364 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv) 2365 { 2366 unsigned long flags; 2367 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr; 2368 struct ib_mad_send_wc mad_send_wc; 2369 struct list_head cancel_list; 2370 2371 INIT_LIST_HEAD(&cancel_list); 2372 2373 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2374 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2375 &mad_agent_priv->send_list, agent_list) { 2376 if (mad_send_wr->status == IB_WC_SUCCESS) { 2377 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2378 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2379 } 2380 } 2381 2382 /* Empty wait list to prevent receives from finding a request */ 2383 list_splice_init(&mad_agent_priv->wait_list, &cancel_list); 2384 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2385 2386 /* Report all cancelled requests */ 2387 mad_send_wc.status = IB_WC_WR_FLUSH_ERR; 2388 mad_send_wc.vendor_err = 0; 2389 2390 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2391 &cancel_list, agent_list) { 2392 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2393 list_del(&mad_send_wr->agent_list); 2394 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2395 &mad_send_wc); 2396 atomic_dec(&mad_agent_priv->refcount); 2397 } 2398 } 2399 2400 static struct ib_mad_send_wr_private* 2401 find_send_wr(struct ib_mad_agent_private *mad_agent_priv, 2402 struct ib_mad_send_buf *send_buf) 2403 { 2404 struct ib_mad_send_wr_private *mad_send_wr; 2405 2406 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list, 2407 agent_list) { 2408 if (&mad_send_wr->send_buf == send_buf) 2409 return mad_send_wr; 2410 } 2411 2412 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list, 2413 agent_list) { 2414 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) && 2415 &mad_send_wr->send_buf == send_buf) 2416 return mad_send_wr; 2417 } 2418 return NULL; 2419 } 2420 2421 int ib_modify_mad(struct ib_mad_agent *mad_agent, 2422 struct ib_mad_send_buf *send_buf, u32 timeout_ms) 2423 { 2424 struct ib_mad_agent_private *mad_agent_priv; 2425 struct ib_mad_send_wr_private *mad_send_wr; 2426 unsigned long flags; 2427 int active; 2428 2429 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, 2430 agent); 2431 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2432 mad_send_wr = find_send_wr(mad_agent_priv, send_buf); 2433 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) { 2434 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2435 return -EINVAL; 2436 } 2437 2438 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1); 2439 if (!timeout_ms) { 2440 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2441 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2442 } 2443 2444 mad_send_wr->send_buf.timeout_ms = timeout_ms; 2445 if (active) 2446 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2447 else 2448 ib_reset_mad_timeout(mad_send_wr, timeout_ms); 2449 2450 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2451 return 0; 2452 } 2453 EXPORT_SYMBOL(ib_modify_mad); 2454 2455 void ib_cancel_mad(struct ib_mad_agent *mad_agent, 2456 struct ib_mad_send_buf *send_buf) 2457 { 2458 ib_modify_mad(mad_agent, send_buf, 0); 2459 } 2460 EXPORT_SYMBOL(ib_cancel_mad); 2461 2462 static void local_completions(struct work_struct *work) 2463 { 2464 struct ib_mad_agent_private *mad_agent_priv; 2465 struct ib_mad_local_private *local; 2466 struct ib_mad_agent_private *recv_mad_agent; 2467 unsigned long flags; 2468 int free_mad; 2469 struct ib_wc wc; 2470 struct ib_mad_send_wc mad_send_wc; 2471 2472 mad_agent_priv = 2473 container_of(work, struct ib_mad_agent_private, local_work); 2474 2475 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2476 while (!list_empty(&mad_agent_priv->local_list)) { 2477 local = list_entry(mad_agent_priv->local_list.next, 2478 struct ib_mad_local_private, 2479 completion_list); 2480 list_del(&local->completion_list); 2481 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2482 free_mad = 0; 2483 if (local->mad_priv) { 2484 recv_mad_agent = local->recv_mad_agent; 2485 if (!recv_mad_agent) { 2486 dev_err(&mad_agent_priv->agent.device->dev, 2487 "No receive MAD agent for local completion\n"); 2488 free_mad = 1; 2489 goto local_send_completion; 2490 } 2491 2492 /* 2493 * Defined behavior is to complete response 2494 * before request 2495 */ 2496 build_smp_wc(recv_mad_agent->agent.qp, 2497 (unsigned long) local->mad_send_wr, 2498 be16_to_cpu(IB_LID_PERMISSIVE), 2499 0, recv_mad_agent->agent.port_num, &wc); 2500 2501 local->mad_priv->header.recv_wc.wc = &wc; 2502 local->mad_priv->header.recv_wc.mad_len = 2503 sizeof(struct ib_mad); 2504 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list); 2505 list_add(&local->mad_priv->header.recv_wc.recv_buf.list, 2506 &local->mad_priv->header.recv_wc.rmpp_list); 2507 local->mad_priv->header.recv_wc.recv_buf.grh = NULL; 2508 local->mad_priv->header.recv_wc.recv_buf.mad = 2509 &local->mad_priv->mad.mad; 2510 if (atomic_read(&recv_mad_agent->qp_info->snoop_count)) 2511 snoop_recv(recv_mad_agent->qp_info, 2512 &local->mad_priv->header.recv_wc, 2513 IB_MAD_SNOOP_RECVS); 2514 recv_mad_agent->agent.recv_handler( 2515 &recv_mad_agent->agent, 2516 &local->mad_priv->header.recv_wc); 2517 spin_lock_irqsave(&recv_mad_agent->lock, flags); 2518 atomic_dec(&recv_mad_agent->refcount); 2519 spin_unlock_irqrestore(&recv_mad_agent->lock, flags); 2520 } 2521 2522 local_send_completion: 2523 /* Complete send */ 2524 mad_send_wc.status = IB_WC_SUCCESS; 2525 mad_send_wc.vendor_err = 0; 2526 mad_send_wc.send_buf = &local->mad_send_wr->send_buf; 2527 if (atomic_read(&mad_agent_priv->qp_info->snoop_count)) 2528 snoop_send(mad_agent_priv->qp_info, 2529 &local->mad_send_wr->send_buf, 2530 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS); 2531 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2532 &mad_send_wc); 2533 2534 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2535 atomic_dec(&mad_agent_priv->refcount); 2536 if (free_mad) 2537 kmem_cache_free(ib_mad_cache, local->mad_priv); 2538 kfree(local); 2539 } 2540 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2541 } 2542 2543 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr) 2544 { 2545 int ret; 2546 2547 if (!mad_send_wr->retries_left) 2548 return -ETIMEDOUT; 2549 2550 mad_send_wr->retries_left--; 2551 mad_send_wr->send_buf.retries++; 2552 2553 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms); 2554 2555 if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) { 2556 ret = ib_retry_rmpp(mad_send_wr); 2557 switch (ret) { 2558 case IB_RMPP_RESULT_UNHANDLED: 2559 ret = ib_send_mad(mad_send_wr); 2560 break; 2561 case IB_RMPP_RESULT_CONSUMED: 2562 ret = 0; 2563 break; 2564 default: 2565 ret = -ECOMM; 2566 break; 2567 } 2568 } else 2569 ret = ib_send_mad(mad_send_wr); 2570 2571 if (!ret) { 2572 mad_send_wr->refcount++; 2573 list_add_tail(&mad_send_wr->agent_list, 2574 &mad_send_wr->mad_agent_priv->send_list); 2575 } 2576 return ret; 2577 } 2578 2579 static void timeout_sends(struct work_struct *work) 2580 { 2581 struct ib_mad_agent_private *mad_agent_priv; 2582 struct ib_mad_send_wr_private *mad_send_wr; 2583 struct ib_mad_send_wc mad_send_wc; 2584 unsigned long flags, delay; 2585 2586 mad_agent_priv = container_of(work, struct ib_mad_agent_private, 2587 timed_work.work); 2588 mad_send_wc.vendor_err = 0; 2589 2590 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2591 while (!list_empty(&mad_agent_priv->wait_list)) { 2592 mad_send_wr = list_entry(mad_agent_priv->wait_list.next, 2593 struct ib_mad_send_wr_private, 2594 agent_list); 2595 2596 if (time_after(mad_send_wr->timeout, jiffies)) { 2597 delay = mad_send_wr->timeout - jiffies; 2598 if ((long)delay <= 0) 2599 delay = 1; 2600 queue_delayed_work(mad_agent_priv->qp_info-> 2601 port_priv->wq, 2602 &mad_agent_priv->timed_work, delay); 2603 break; 2604 } 2605 2606 list_del(&mad_send_wr->agent_list); 2607 if (mad_send_wr->status == IB_WC_SUCCESS && 2608 !retry_send(mad_send_wr)) 2609 continue; 2610 2611 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2612 2613 if (mad_send_wr->status == IB_WC_SUCCESS) 2614 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR; 2615 else 2616 mad_send_wc.status = mad_send_wr->status; 2617 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2618 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2619 &mad_send_wc); 2620 2621 atomic_dec(&mad_agent_priv->refcount); 2622 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2623 } 2624 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2625 } 2626 2627 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg) 2628 { 2629 struct ib_mad_port_private *port_priv = cq->cq_context; 2630 unsigned long flags; 2631 2632 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2633 if (!list_empty(&port_priv->port_list)) 2634 queue_work(port_priv->wq, &port_priv->work); 2635 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2636 } 2637 2638 /* 2639 * Allocate receive MADs and post receive WRs for them 2640 */ 2641 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info, 2642 struct ib_mad_private *mad) 2643 { 2644 unsigned long flags; 2645 int post, ret; 2646 struct ib_mad_private *mad_priv; 2647 struct ib_sge sg_list; 2648 struct ib_recv_wr recv_wr, *bad_recv_wr; 2649 struct ib_mad_queue *recv_queue = &qp_info->recv_queue; 2650 2651 /* Initialize common scatter list fields */ 2652 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header; 2653 sg_list.lkey = (*qp_info->port_priv->mr).lkey; 2654 2655 /* Initialize common receive WR fields */ 2656 recv_wr.next = NULL; 2657 recv_wr.sg_list = &sg_list; 2658 recv_wr.num_sge = 1; 2659 2660 do { 2661 /* Allocate and map receive buffer */ 2662 if (mad) { 2663 mad_priv = mad; 2664 mad = NULL; 2665 } else { 2666 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL); 2667 if (!mad_priv) { 2668 dev_err(&qp_info->port_priv->device->dev, 2669 "No memory for receive buffer\n"); 2670 ret = -ENOMEM; 2671 break; 2672 } 2673 } 2674 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device, 2675 &mad_priv->grh, 2676 sizeof *mad_priv - 2677 sizeof mad_priv->header, 2678 DMA_FROM_DEVICE); 2679 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device, 2680 sg_list.addr))) { 2681 ret = -ENOMEM; 2682 break; 2683 } 2684 mad_priv->header.mapping = sg_list.addr; 2685 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list; 2686 mad_priv->header.mad_list.mad_queue = recv_queue; 2687 2688 /* Post receive WR */ 2689 spin_lock_irqsave(&recv_queue->lock, flags); 2690 post = (++recv_queue->count < recv_queue->max_active); 2691 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list); 2692 spin_unlock_irqrestore(&recv_queue->lock, flags); 2693 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr); 2694 if (ret) { 2695 spin_lock_irqsave(&recv_queue->lock, flags); 2696 list_del(&mad_priv->header.mad_list.list); 2697 recv_queue->count--; 2698 spin_unlock_irqrestore(&recv_queue->lock, flags); 2699 ib_dma_unmap_single(qp_info->port_priv->device, 2700 mad_priv->header.mapping, 2701 sizeof *mad_priv - 2702 sizeof mad_priv->header, 2703 DMA_FROM_DEVICE); 2704 kmem_cache_free(ib_mad_cache, mad_priv); 2705 dev_err(&qp_info->port_priv->device->dev, 2706 "ib_post_recv failed: %d\n", ret); 2707 break; 2708 } 2709 } while (post); 2710 2711 return ret; 2712 } 2713 2714 /* 2715 * Return all the posted receive MADs 2716 */ 2717 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info) 2718 { 2719 struct ib_mad_private_header *mad_priv_hdr; 2720 struct ib_mad_private *recv; 2721 struct ib_mad_list_head *mad_list; 2722 2723 if (!qp_info->qp) 2724 return; 2725 2726 while (!list_empty(&qp_info->recv_queue.list)) { 2727 2728 mad_list = list_entry(qp_info->recv_queue.list.next, 2729 struct ib_mad_list_head, list); 2730 mad_priv_hdr = container_of(mad_list, 2731 struct ib_mad_private_header, 2732 mad_list); 2733 recv = container_of(mad_priv_hdr, struct ib_mad_private, 2734 header); 2735 2736 /* Remove from posted receive MAD list */ 2737 list_del(&mad_list->list); 2738 2739 ib_dma_unmap_single(qp_info->port_priv->device, 2740 recv->header.mapping, 2741 sizeof(struct ib_mad_private) - 2742 sizeof(struct ib_mad_private_header), 2743 DMA_FROM_DEVICE); 2744 kmem_cache_free(ib_mad_cache, recv); 2745 } 2746 2747 qp_info->recv_queue.count = 0; 2748 } 2749 2750 /* 2751 * Start the port 2752 */ 2753 static int ib_mad_port_start(struct ib_mad_port_private *port_priv) 2754 { 2755 int ret, i; 2756 struct ib_qp_attr *attr; 2757 struct ib_qp *qp; 2758 u16 pkey_index; 2759 2760 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2761 if (!attr) { 2762 dev_err(&port_priv->device->dev, 2763 "Couldn't kmalloc ib_qp_attr\n"); 2764 return -ENOMEM; 2765 } 2766 2767 ret = ib_find_pkey(port_priv->device, port_priv->port_num, 2768 IB_DEFAULT_PKEY_FULL, &pkey_index); 2769 if (ret) 2770 pkey_index = 0; 2771 2772 for (i = 0; i < IB_MAD_QPS_CORE; i++) { 2773 qp = port_priv->qp_info[i].qp; 2774 if (!qp) 2775 continue; 2776 2777 /* 2778 * PKey index for QP1 is irrelevant but 2779 * one is needed for the Reset to Init transition 2780 */ 2781 attr->qp_state = IB_QPS_INIT; 2782 attr->pkey_index = pkey_index; 2783 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY; 2784 ret = ib_modify_qp(qp, attr, IB_QP_STATE | 2785 IB_QP_PKEY_INDEX | IB_QP_QKEY); 2786 if (ret) { 2787 dev_err(&port_priv->device->dev, 2788 "Couldn't change QP%d state to INIT: %d\n", 2789 i, ret); 2790 goto out; 2791 } 2792 2793 attr->qp_state = IB_QPS_RTR; 2794 ret = ib_modify_qp(qp, attr, IB_QP_STATE); 2795 if (ret) { 2796 dev_err(&port_priv->device->dev, 2797 "Couldn't change QP%d state to RTR: %d\n", 2798 i, ret); 2799 goto out; 2800 } 2801 2802 attr->qp_state = IB_QPS_RTS; 2803 attr->sq_psn = IB_MAD_SEND_Q_PSN; 2804 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN); 2805 if (ret) { 2806 dev_err(&port_priv->device->dev, 2807 "Couldn't change QP%d state to RTS: %d\n", 2808 i, ret); 2809 goto out; 2810 } 2811 } 2812 2813 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); 2814 if (ret) { 2815 dev_err(&port_priv->device->dev, 2816 "Failed to request completion notification: %d\n", 2817 ret); 2818 goto out; 2819 } 2820 2821 for (i = 0; i < IB_MAD_QPS_CORE; i++) { 2822 if (!port_priv->qp_info[i].qp) 2823 continue; 2824 2825 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL); 2826 if (ret) { 2827 dev_err(&port_priv->device->dev, 2828 "Couldn't post receive WRs\n"); 2829 goto out; 2830 } 2831 } 2832 out: 2833 kfree(attr); 2834 return ret; 2835 } 2836 2837 static void qp_event_handler(struct ib_event *event, void *qp_context) 2838 { 2839 struct ib_mad_qp_info *qp_info = qp_context; 2840 2841 /* It's worse than that! He's dead, Jim! */ 2842 dev_err(&qp_info->port_priv->device->dev, 2843 "Fatal error (%d) on MAD QP (%d)\n", 2844 event->event, qp_info->qp->qp_num); 2845 } 2846 2847 static void init_mad_queue(struct ib_mad_qp_info *qp_info, 2848 struct ib_mad_queue *mad_queue) 2849 { 2850 mad_queue->qp_info = qp_info; 2851 mad_queue->count = 0; 2852 spin_lock_init(&mad_queue->lock); 2853 INIT_LIST_HEAD(&mad_queue->list); 2854 } 2855 2856 static void init_mad_qp(struct ib_mad_port_private *port_priv, 2857 struct ib_mad_qp_info *qp_info) 2858 { 2859 qp_info->port_priv = port_priv; 2860 init_mad_queue(qp_info, &qp_info->send_queue); 2861 init_mad_queue(qp_info, &qp_info->recv_queue); 2862 INIT_LIST_HEAD(&qp_info->overflow_list); 2863 spin_lock_init(&qp_info->snoop_lock); 2864 qp_info->snoop_table = NULL; 2865 qp_info->snoop_table_size = 0; 2866 atomic_set(&qp_info->snoop_count, 0); 2867 } 2868 2869 static int create_mad_qp(struct ib_mad_qp_info *qp_info, 2870 enum ib_qp_type qp_type) 2871 { 2872 struct ib_qp_init_attr qp_init_attr; 2873 int ret; 2874 2875 memset(&qp_init_attr, 0, sizeof qp_init_attr); 2876 qp_init_attr.send_cq = qp_info->port_priv->cq; 2877 qp_init_attr.recv_cq = qp_info->port_priv->cq; 2878 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR; 2879 qp_init_attr.cap.max_send_wr = mad_sendq_size; 2880 qp_init_attr.cap.max_recv_wr = mad_recvq_size; 2881 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG; 2882 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG; 2883 qp_init_attr.qp_type = qp_type; 2884 qp_init_attr.port_num = qp_info->port_priv->port_num; 2885 qp_init_attr.qp_context = qp_info; 2886 qp_init_attr.event_handler = qp_event_handler; 2887 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr); 2888 if (IS_ERR(qp_info->qp)) { 2889 dev_err(&qp_info->port_priv->device->dev, 2890 "Couldn't create ib_mad QP%d\n", 2891 get_spl_qp_index(qp_type)); 2892 ret = PTR_ERR(qp_info->qp); 2893 goto error; 2894 } 2895 /* Use minimum queue sizes unless the CQ is resized */ 2896 qp_info->send_queue.max_active = mad_sendq_size; 2897 qp_info->recv_queue.max_active = mad_recvq_size; 2898 return 0; 2899 2900 error: 2901 return ret; 2902 } 2903 2904 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info) 2905 { 2906 if (!qp_info->qp) 2907 return; 2908 2909 ib_destroy_qp(qp_info->qp); 2910 kfree(qp_info->snoop_table); 2911 } 2912 2913 /* 2914 * Open the port 2915 * Create the QP, PD, MR, and CQ if needed 2916 */ 2917 static int ib_mad_port_open(struct ib_device *device, 2918 int port_num) 2919 { 2920 int ret, cq_size; 2921 struct ib_mad_port_private *port_priv; 2922 unsigned long flags; 2923 char name[sizeof "ib_mad123"]; 2924 int has_smi; 2925 2926 /* Create new device info */ 2927 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL); 2928 if (!port_priv) { 2929 dev_err(&device->dev, "No memory for ib_mad_port_private\n"); 2930 return -ENOMEM; 2931 } 2932 2933 port_priv->device = device; 2934 port_priv->port_num = port_num; 2935 spin_lock_init(&port_priv->reg_lock); 2936 INIT_LIST_HEAD(&port_priv->agent_list); 2937 init_mad_qp(port_priv, &port_priv->qp_info[0]); 2938 init_mad_qp(port_priv, &port_priv->qp_info[1]); 2939 2940 cq_size = mad_sendq_size + mad_recvq_size; 2941 has_smi = rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_INFINIBAND; 2942 if (has_smi) 2943 cq_size *= 2; 2944 2945 port_priv->cq = ib_create_cq(port_priv->device, 2946 ib_mad_thread_completion_handler, 2947 NULL, port_priv, cq_size, 0); 2948 if (IS_ERR(port_priv->cq)) { 2949 dev_err(&device->dev, "Couldn't create ib_mad CQ\n"); 2950 ret = PTR_ERR(port_priv->cq); 2951 goto error3; 2952 } 2953 2954 port_priv->pd = ib_alloc_pd(device); 2955 if (IS_ERR(port_priv->pd)) { 2956 dev_err(&device->dev, "Couldn't create ib_mad PD\n"); 2957 ret = PTR_ERR(port_priv->pd); 2958 goto error4; 2959 } 2960 2961 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE); 2962 if (IS_ERR(port_priv->mr)) { 2963 dev_err(&device->dev, "Couldn't get ib_mad DMA MR\n"); 2964 ret = PTR_ERR(port_priv->mr); 2965 goto error5; 2966 } 2967 2968 if (has_smi) { 2969 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI); 2970 if (ret) 2971 goto error6; 2972 } 2973 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI); 2974 if (ret) 2975 goto error7; 2976 2977 snprintf(name, sizeof name, "ib_mad%d", port_num); 2978 port_priv->wq = create_singlethread_workqueue(name); 2979 if (!port_priv->wq) { 2980 ret = -ENOMEM; 2981 goto error8; 2982 } 2983 INIT_WORK(&port_priv->work, ib_mad_completion_handler); 2984 2985 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2986 list_add_tail(&port_priv->port_list, &ib_mad_port_list); 2987 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 2988 2989 ret = ib_mad_port_start(port_priv); 2990 if (ret) { 2991 dev_err(&device->dev, "Couldn't start port\n"); 2992 goto error9; 2993 } 2994 2995 return 0; 2996 2997 error9: 2998 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 2999 list_del_init(&port_priv->port_list); 3000 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 3001 3002 destroy_workqueue(port_priv->wq); 3003 error8: 3004 destroy_mad_qp(&port_priv->qp_info[1]); 3005 error7: 3006 destroy_mad_qp(&port_priv->qp_info[0]); 3007 error6: 3008 ib_dereg_mr(port_priv->mr); 3009 error5: 3010 ib_dealloc_pd(port_priv->pd); 3011 error4: 3012 ib_destroy_cq(port_priv->cq); 3013 cleanup_recv_queue(&port_priv->qp_info[1]); 3014 cleanup_recv_queue(&port_priv->qp_info[0]); 3015 error3: 3016 kfree(port_priv); 3017 3018 return ret; 3019 } 3020 3021 /* 3022 * Close the port 3023 * If there are no classes using the port, free the port 3024 * resources (CQ, MR, PD, QP) and remove the port's info structure 3025 */ 3026 static int ib_mad_port_close(struct ib_device *device, int port_num) 3027 { 3028 struct ib_mad_port_private *port_priv; 3029 unsigned long flags; 3030 3031 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 3032 port_priv = __ib_get_mad_port(device, port_num); 3033 if (port_priv == NULL) { 3034 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 3035 dev_err(&device->dev, "Port %d not found\n", port_num); 3036 return -ENODEV; 3037 } 3038 list_del_init(&port_priv->port_list); 3039 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 3040 3041 destroy_workqueue(port_priv->wq); 3042 destroy_mad_qp(&port_priv->qp_info[1]); 3043 destroy_mad_qp(&port_priv->qp_info[0]); 3044 ib_dereg_mr(port_priv->mr); 3045 ib_dealloc_pd(port_priv->pd); 3046 ib_destroy_cq(port_priv->cq); 3047 cleanup_recv_queue(&port_priv->qp_info[1]); 3048 cleanup_recv_queue(&port_priv->qp_info[0]); 3049 /* XXX: Handle deallocation of MAD registration tables */ 3050 3051 kfree(port_priv); 3052 3053 return 0; 3054 } 3055 3056 static void ib_mad_init_device(struct ib_device *device) 3057 { 3058 int start, end, i; 3059 3060 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 3061 return; 3062 3063 if (device->node_type == RDMA_NODE_IB_SWITCH) { 3064 start = 0; 3065 end = 0; 3066 } else { 3067 start = 1; 3068 end = device->phys_port_cnt; 3069 } 3070 3071 for (i = start; i <= end; i++) { 3072 if (ib_mad_port_open(device, i)) { 3073 dev_err(&device->dev, "Couldn't open port %d\n", i); 3074 goto error; 3075 } 3076 if (ib_agent_port_open(device, i)) { 3077 dev_err(&device->dev, 3078 "Couldn't open port %d for agents\n", i); 3079 goto error_agent; 3080 } 3081 } 3082 return; 3083 3084 error_agent: 3085 if (ib_mad_port_close(device, i)) 3086 dev_err(&device->dev, "Couldn't close port %d\n", i); 3087 3088 error: 3089 i--; 3090 3091 while (i >= start) { 3092 if (ib_agent_port_close(device, i)) 3093 dev_err(&device->dev, 3094 "Couldn't close port %d for agents\n", i); 3095 if (ib_mad_port_close(device, i)) 3096 dev_err(&device->dev, "Couldn't close port %d\n", i); 3097 i--; 3098 } 3099 } 3100 3101 static void ib_mad_remove_device(struct ib_device *device) 3102 { 3103 int i, num_ports, cur_port; 3104 3105 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 3106 return; 3107 3108 if (device->node_type == RDMA_NODE_IB_SWITCH) { 3109 num_ports = 1; 3110 cur_port = 0; 3111 } else { 3112 num_ports = device->phys_port_cnt; 3113 cur_port = 1; 3114 } 3115 for (i = 0; i < num_ports; i++, cur_port++) { 3116 if (ib_agent_port_close(device, cur_port)) 3117 dev_err(&device->dev, 3118 "Couldn't close port %d for agents\n", 3119 cur_port); 3120 if (ib_mad_port_close(device, cur_port)) 3121 dev_err(&device->dev, "Couldn't close port %d\n", 3122 cur_port); 3123 } 3124 } 3125 3126 static struct ib_client mad_client = { 3127 .name = "mad", 3128 .add = ib_mad_init_device, 3129 .remove = ib_mad_remove_device 3130 }; 3131 3132 static int __init ib_mad_init_module(void) 3133 { 3134 int ret; 3135 3136 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE); 3137 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE); 3138 3139 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE); 3140 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE); 3141 3142 ib_mad_cache = kmem_cache_create("ib_mad", 3143 sizeof(struct ib_mad_private), 3144 0, 3145 SLAB_HWCACHE_ALIGN, 3146 NULL); 3147 if (!ib_mad_cache) { 3148 pr_err("Couldn't create ib_mad cache\n"); 3149 ret = -ENOMEM; 3150 goto error1; 3151 } 3152 3153 INIT_LIST_HEAD(&ib_mad_port_list); 3154 3155 if (ib_register_client(&mad_client)) { 3156 pr_err("Couldn't register ib_mad client\n"); 3157 ret = -EINVAL; 3158 goto error2; 3159 } 3160 3161 return 0; 3162 3163 error2: 3164 kmem_cache_destroy(ib_mad_cache); 3165 error1: 3166 return ret; 3167 } 3168 3169 static void __exit ib_mad_cleanup_module(void) 3170 { 3171 ib_unregister_client(&mad_client); 3172 kmem_cache_destroy(ib_mad_cache); 3173 } 3174 3175 module_init(ib_mad_init_module); 3176 module_exit(ib_mad_cleanup_module); 3177