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 * Copyright (c) 2014 Intel Corporation. All rights reserved. 7 * 8 * This software is available to you under a choice of one of two 9 * licenses. You may choose to be licensed under the terms of the GNU 10 * General Public License (GPL) Version 2, available from the file 11 * COPYING in the main directory of this source tree, or the 12 * OpenIB.org BSD license below: 13 * 14 * Redistribution and use in source and binary forms, with or 15 * without modification, are permitted provided that the following 16 * conditions are met: 17 * 18 * - Redistributions of source code must retain the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer. 21 * 22 * - Redistributions in binary form must reproduce the above 23 * copyright notice, this list of conditions and the following 24 * disclaimer in the documentation and/or other materials 25 * provided with the distribution. 26 * 27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 28 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 29 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 30 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 31 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 32 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 33 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 34 * SOFTWARE. 35 * 36 */ 37 38 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 39 40 #include <linux/dma-mapping.h> 41 #include <linux/slab.h> 42 #include <linux/module.h> 43 #include <rdma/ib_cache.h> 44 45 #include "mad_priv.h" 46 #include "mad_rmpp.h" 47 #include "smi.h" 48 #include "opa_smi.h" 49 #include "agent.h" 50 #include "core_priv.h" 51 52 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE; 53 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE; 54 55 module_param_named(send_queue_size, mad_sendq_size, int, 0444); 56 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests"); 57 module_param_named(recv_queue_size, mad_recvq_size, int, 0444); 58 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests"); 59 60 static struct list_head ib_mad_port_list; 61 static u32 ib_mad_client_id = 0; 62 63 /* Port list lock */ 64 static DEFINE_SPINLOCK(ib_mad_port_list_lock); 65 66 /* Forward declarations */ 67 static int method_in_use(struct ib_mad_mgmt_method_table **method, 68 struct ib_mad_reg_req *mad_reg_req); 69 static void remove_mad_reg_req(struct ib_mad_agent_private *priv); 70 static struct ib_mad_agent_private *find_mad_agent( 71 struct ib_mad_port_private *port_priv, 72 const struct ib_mad_hdr *mad); 73 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info, 74 struct ib_mad_private *mad); 75 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv); 76 static void timeout_sends(struct work_struct *work); 77 static void local_completions(struct work_struct *work); 78 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req, 79 struct ib_mad_agent_private *agent_priv, 80 u8 mgmt_class); 81 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req, 82 struct ib_mad_agent_private *agent_priv); 83 static bool ib_mad_send_error(struct ib_mad_port_private *port_priv, 84 struct ib_wc *wc); 85 static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc); 86 87 /* 88 * Returns a ib_mad_port_private structure or NULL for a device/port 89 * Assumes ib_mad_port_list_lock is being held 90 */ 91 static inline struct ib_mad_port_private * 92 __ib_get_mad_port(struct ib_device *device, int port_num) 93 { 94 struct ib_mad_port_private *entry; 95 96 list_for_each_entry(entry, &ib_mad_port_list, port_list) { 97 if (entry->device == device && entry->port_num == port_num) 98 return entry; 99 } 100 return NULL; 101 } 102 103 /* 104 * Wrapper function to return a ib_mad_port_private structure or NULL 105 * for a device/port 106 */ 107 static inline struct ib_mad_port_private * 108 ib_get_mad_port(struct ib_device *device, int port_num) 109 { 110 struct ib_mad_port_private *entry; 111 unsigned long flags; 112 113 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 114 entry = __ib_get_mad_port(device, port_num); 115 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 116 117 return entry; 118 } 119 120 static inline u8 convert_mgmt_class(u8 mgmt_class) 121 { 122 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */ 123 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ? 124 0 : mgmt_class; 125 } 126 127 static int get_spl_qp_index(enum ib_qp_type qp_type) 128 { 129 switch (qp_type) 130 { 131 case IB_QPT_SMI: 132 return 0; 133 case IB_QPT_GSI: 134 return 1; 135 default: 136 return -1; 137 } 138 } 139 140 static int vendor_class_index(u8 mgmt_class) 141 { 142 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START; 143 } 144 145 static int is_vendor_class(u8 mgmt_class) 146 { 147 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) || 148 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END)) 149 return 0; 150 return 1; 151 } 152 153 static int is_vendor_oui(char *oui) 154 { 155 if (oui[0] || oui[1] || oui[2]) 156 return 1; 157 return 0; 158 } 159 160 static int is_vendor_method_in_use( 161 struct ib_mad_mgmt_vendor_class *vendor_class, 162 struct ib_mad_reg_req *mad_reg_req) 163 { 164 struct ib_mad_mgmt_method_table *method; 165 int i; 166 167 for (i = 0; i < MAX_MGMT_OUI; i++) { 168 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) { 169 method = vendor_class->method_table[i]; 170 if (method) { 171 if (method_in_use(&method, mad_reg_req)) 172 return 1; 173 else 174 break; 175 } 176 } 177 } 178 return 0; 179 } 180 181 int ib_response_mad(const struct ib_mad_hdr *hdr) 182 { 183 return ((hdr->method & IB_MGMT_METHOD_RESP) || 184 (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) || 185 ((hdr->mgmt_class == IB_MGMT_CLASS_BM) && 186 (hdr->attr_mod & IB_BM_ATTR_MOD_RESP))); 187 } 188 EXPORT_SYMBOL(ib_response_mad); 189 190 /* 191 * ib_register_mad_agent - Register to send/receive MADs 192 */ 193 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device, 194 u8 port_num, 195 enum ib_qp_type qp_type, 196 struct ib_mad_reg_req *mad_reg_req, 197 u8 rmpp_version, 198 ib_mad_send_handler send_handler, 199 ib_mad_recv_handler recv_handler, 200 void *context, 201 u32 registration_flags) 202 { 203 struct ib_mad_port_private *port_priv; 204 struct ib_mad_agent *ret = ERR_PTR(-EINVAL); 205 struct ib_mad_agent_private *mad_agent_priv; 206 struct ib_mad_reg_req *reg_req = NULL; 207 struct ib_mad_mgmt_class_table *class; 208 struct ib_mad_mgmt_vendor_class_table *vendor; 209 struct ib_mad_mgmt_vendor_class *vendor_class; 210 struct ib_mad_mgmt_method_table *method; 211 int ret2, qpn; 212 unsigned long flags; 213 u8 mgmt_class, vclass; 214 215 /* Validate parameters */ 216 qpn = get_spl_qp_index(qp_type); 217 if (qpn == -1) { 218 dev_notice(&device->dev, 219 "ib_register_mad_agent: invalid QP Type %d\n", 220 qp_type); 221 goto error1; 222 } 223 224 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) { 225 dev_notice(&device->dev, 226 "ib_register_mad_agent: invalid RMPP Version %u\n", 227 rmpp_version); 228 goto error1; 229 } 230 231 /* Validate MAD registration request if supplied */ 232 if (mad_reg_req) { 233 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) { 234 dev_notice(&device->dev, 235 "ib_register_mad_agent: invalid Class Version %u\n", 236 mad_reg_req->mgmt_class_version); 237 goto error1; 238 } 239 if (!recv_handler) { 240 dev_notice(&device->dev, 241 "ib_register_mad_agent: no recv_handler\n"); 242 goto error1; 243 } 244 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) { 245 /* 246 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only 247 * one in this range currently allowed 248 */ 249 if (mad_reg_req->mgmt_class != 250 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 251 dev_notice(&device->dev, 252 "ib_register_mad_agent: Invalid Mgmt Class 0x%x\n", 253 mad_reg_req->mgmt_class); 254 goto error1; 255 } 256 } else if (mad_reg_req->mgmt_class == 0) { 257 /* 258 * Class 0 is reserved in IBA and is used for 259 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE 260 */ 261 dev_notice(&device->dev, 262 "ib_register_mad_agent: Invalid Mgmt Class 0\n"); 263 goto error1; 264 } else if (is_vendor_class(mad_reg_req->mgmt_class)) { 265 /* 266 * If class is in "new" vendor range, 267 * ensure supplied OUI is not zero 268 */ 269 if (!is_vendor_oui(mad_reg_req->oui)) { 270 dev_notice(&device->dev, 271 "ib_register_mad_agent: No OUI specified for class 0x%x\n", 272 mad_reg_req->mgmt_class); 273 goto error1; 274 } 275 } 276 /* Make sure class supplied is consistent with RMPP */ 277 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) { 278 if (rmpp_version) { 279 dev_notice(&device->dev, 280 "ib_register_mad_agent: RMPP version for non-RMPP class 0x%x\n", 281 mad_reg_req->mgmt_class); 282 goto error1; 283 } 284 } 285 286 /* Make sure class supplied is consistent with QP type */ 287 if (qp_type == IB_QPT_SMI) { 288 if ((mad_reg_req->mgmt_class != 289 IB_MGMT_CLASS_SUBN_LID_ROUTED) && 290 (mad_reg_req->mgmt_class != 291 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) { 292 dev_notice(&device->dev, 293 "ib_register_mad_agent: Invalid SM QP type: class 0x%x\n", 294 mad_reg_req->mgmt_class); 295 goto error1; 296 } 297 } else { 298 if ((mad_reg_req->mgmt_class == 299 IB_MGMT_CLASS_SUBN_LID_ROUTED) || 300 (mad_reg_req->mgmt_class == 301 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) { 302 dev_notice(&device->dev, 303 "ib_register_mad_agent: Invalid GS QP type: class 0x%x\n", 304 mad_reg_req->mgmt_class); 305 goto error1; 306 } 307 } 308 } else { 309 /* No registration request supplied */ 310 if (!send_handler) 311 goto error1; 312 if (registration_flags & IB_MAD_USER_RMPP) 313 goto error1; 314 } 315 316 /* Validate device and port */ 317 port_priv = ib_get_mad_port(device, port_num); 318 if (!port_priv) { 319 dev_notice(&device->dev, 320 "ib_register_mad_agent: Invalid port %d\n", 321 port_num); 322 ret = ERR_PTR(-ENODEV); 323 goto error1; 324 } 325 326 /* Verify the QP requested is supported. For example, Ethernet devices 327 * will not have QP0 */ 328 if (!port_priv->qp_info[qpn].qp) { 329 dev_notice(&device->dev, 330 "ib_register_mad_agent: QP %d not supported\n", qpn); 331 ret = ERR_PTR(-EPROTONOSUPPORT); 332 goto error1; 333 } 334 335 /* Allocate structures */ 336 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL); 337 if (!mad_agent_priv) { 338 ret = ERR_PTR(-ENOMEM); 339 goto error1; 340 } 341 342 if (mad_reg_req) { 343 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL); 344 if (!reg_req) { 345 ret = ERR_PTR(-ENOMEM); 346 goto error3; 347 } 348 } 349 350 /* Now, fill in the various structures */ 351 mad_agent_priv->qp_info = &port_priv->qp_info[qpn]; 352 mad_agent_priv->reg_req = reg_req; 353 mad_agent_priv->agent.rmpp_version = rmpp_version; 354 mad_agent_priv->agent.device = device; 355 mad_agent_priv->agent.recv_handler = recv_handler; 356 mad_agent_priv->agent.send_handler = send_handler; 357 mad_agent_priv->agent.context = context; 358 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp; 359 mad_agent_priv->agent.port_num = port_num; 360 mad_agent_priv->agent.flags = registration_flags; 361 spin_lock_init(&mad_agent_priv->lock); 362 INIT_LIST_HEAD(&mad_agent_priv->send_list); 363 INIT_LIST_HEAD(&mad_agent_priv->wait_list); 364 INIT_LIST_HEAD(&mad_agent_priv->done_list); 365 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list); 366 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends); 367 INIT_LIST_HEAD(&mad_agent_priv->local_list); 368 INIT_WORK(&mad_agent_priv->local_work, local_completions); 369 atomic_set(&mad_agent_priv->refcount, 1); 370 init_completion(&mad_agent_priv->comp); 371 372 spin_lock_irqsave(&port_priv->reg_lock, flags); 373 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id; 374 375 /* 376 * Make sure MAD registration (if supplied) 377 * is non overlapping with any existing ones 378 */ 379 if (mad_reg_req) { 380 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class); 381 if (!is_vendor_class(mgmt_class)) { 382 class = port_priv->version[mad_reg_req-> 383 mgmt_class_version].class; 384 if (class) { 385 method = class->method_table[mgmt_class]; 386 if (method) { 387 if (method_in_use(&method, 388 mad_reg_req)) 389 goto error4; 390 } 391 } 392 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv, 393 mgmt_class); 394 } else { 395 /* "New" vendor class range */ 396 vendor = port_priv->version[mad_reg_req-> 397 mgmt_class_version].vendor; 398 if (vendor) { 399 vclass = vendor_class_index(mgmt_class); 400 vendor_class = vendor->vendor_class[vclass]; 401 if (vendor_class) { 402 if (is_vendor_method_in_use( 403 vendor_class, 404 mad_reg_req)) 405 goto error4; 406 } 407 } 408 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv); 409 } 410 if (ret2) { 411 ret = ERR_PTR(ret2); 412 goto error4; 413 } 414 } 415 416 /* Add mad agent into port's agent list */ 417 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list); 418 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 419 420 return &mad_agent_priv->agent; 421 422 error4: 423 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 424 kfree(reg_req); 425 error3: 426 kfree(mad_agent_priv); 427 error1: 428 return ret; 429 } 430 EXPORT_SYMBOL(ib_register_mad_agent); 431 432 static inline int is_snooping_sends(int mad_snoop_flags) 433 { 434 return (mad_snoop_flags & 435 (/*IB_MAD_SNOOP_POSTED_SENDS | 436 IB_MAD_SNOOP_RMPP_SENDS |*/ 437 IB_MAD_SNOOP_SEND_COMPLETIONS /*| 438 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/)); 439 } 440 441 static inline int is_snooping_recvs(int mad_snoop_flags) 442 { 443 return (mad_snoop_flags & 444 (IB_MAD_SNOOP_RECVS /*| 445 IB_MAD_SNOOP_RMPP_RECVS*/)); 446 } 447 448 static int register_snoop_agent(struct ib_mad_qp_info *qp_info, 449 struct ib_mad_snoop_private *mad_snoop_priv) 450 { 451 struct ib_mad_snoop_private **new_snoop_table; 452 unsigned long flags; 453 int i; 454 455 spin_lock_irqsave(&qp_info->snoop_lock, flags); 456 /* Check for empty slot in array. */ 457 for (i = 0; i < qp_info->snoop_table_size; i++) 458 if (!qp_info->snoop_table[i]) 459 break; 460 461 if (i == qp_info->snoop_table_size) { 462 /* Grow table. */ 463 new_snoop_table = krealloc(qp_info->snoop_table, 464 sizeof mad_snoop_priv * 465 (qp_info->snoop_table_size + 1), 466 GFP_ATOMIC); 467 if (!new_snoop_table) { 468 i = -ENOMEM; 469 goto out; 470 } 471 472 qp_info->snoop_table = new_snoop_table; 473 qp_info->snoop_table_size++; 474 } 475 qp_info->snoop_table[i] = mad_snoop_priv; 476 atomic_inc(&qp_info->snoop_count); 477 out: 478 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 479 return i; 480 } 481 482 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device, 483 u8 port_num, 484 enum ib_qp_type qp_type, 485 int mad_snoop_flags, 486 ib_mad_snoop_handler snoop_handler, 487 ib_mad_recv_handler recv_handler, 488 void *context) 489 { 490 struct ib_mad_port_private *port_priv; 491 struct ib_mad_agent *ret; 492 struct ib_mad_snoop_private *mad_snoop_priv; 493 int qpn; 494 495 /* Validate parameters */ 496 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) || 497 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) { 498 ret = ERR_PTR(-EINVAL); 499 goto error1; 500 } 501 qpn = get_spl_qp_index(qp_type); 502 if (qpn == -1) { 503 ret = ERR_PTR(-EINVAL); 504 goto error1; 505 } 506 port_priv = ib_get_mad_port(device, port_num); 507 if (!port_priv) { 508 ret = ERR_PTR(-ENODEV); 509 goto error1; 510 } 511 /* Allocate structures */ 512 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL); 513 if (!mad_snoop_priv) { 514 ret = ERR_PTR(-ENOMEM); 515 goto error1; 516 } 517 518 /* Now, fill in the various structures */ 519 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn]; 520 mad_snoop_priv->agent.device = device; 521 mad_snoop_priv->agent.recv_handler = recv_handler; 522 mad_snoop_priv->agent.snoop_handler = snoop_handler; 523 mad_snoop_priv->agent.context = context; 524 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp; 525 mad_snoop_priv->agent.port_num = port_num; 526 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags; 527 init_completion(&mad_snoop_priv->comp); 528 mad_snoop_priv->snoop_index = register_snoop_agent( 529 &port_priv->qp_info[qpn], 530 mad_snoop_priv); 531 if (mad_snoop_priv->snoop_index < 0) { 532 ret = ERR_PTR(mad_snoop_priv->snoop_index); 533 goto error2; 534 } 535 536 atomic_set(&mad_snoop_priv->refcount, 1); 537 return &mad_snoop_priv->agent; 538 539 error2: 540 kfree(mad_snoop_priv); 541 error1: 542 return ret; 543 } 544 EXPORT_SYMBOL(ib_register_mad_snoop); 545 546 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv) 547 { 548 if (atomic_dec_and_test(&mad_agent_priv->refcount)) 549 complete(&mad_agent_priv->comp); 550 } 551 552 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv) 553 { 554 if (atomic_dec_and_test(&mad_snoop_priv->refcount)) 555 complete(&mad_snoop_priv->comp); 556 } 557 558 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv) 559 { 560 struct ib_mad_port_private *port_priv; 561 unsigned long flags; 562 563 /* Note that we could still be handling received MADs */ 564 565 /* 566 * Canceling all sends results in dropping received response 567 * MADs, preventing us from queuing additional work 568 */ 569 cancel_mads(mad_agent_priv); 570 port_priv = mad_agent_priv->qp_info->port_priv; 571 cancel_delayed_work(&mad_agent_priv->timed_work); 572 573 spin_lock_irqsave(&port_priv->reg_lock, flags); 574 remove_mad_reg_req(mad_agent_priv); 575 list_del(&mad_agent_priv->agent_list); 576 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 577 578 flush_workqueue(port_priv->wq); 579 ib_cancel_rmpp_recvs(mad_agent_priv); 580 581 deref_mad_agent(mad_agent_priv); 582 wait_for_completion(&mad_agent_priv->comp); 583 584 kfree(mad_agent_priv->reg_req); 585 kfree(mad_agent_priv); 586 } 587 588 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv) 589 { 590 struct ib_mad_qp_info *qp_info; 591 unsigned long flags; 592 593 qp_info = mad_snoop_priv->qp_info; 594 spin_lock_irqsave(&qp_info->snoop_lock, flags); 595 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL; 596 atomic_dec(&qp_info->snoop_count); 597 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 598 599 deref_snoop_agent(mad_snoop_priv); 600 wait_for_completion(&mad_snoop_priv->comp); 601 602 kfree(mad_snoop_priv); 603 } 604 605 /* 606 * ib_unregister_mad_agent - Unregisters a client from using MAD services 607 */ 608 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent) 609 { 610 struct ib_mad_agent_private *mad_agent_priv; 611 struct ib_mad_snoop_private *mad_snoop_priv; 612 613 /* If the TID is zero, the agent can only snoop. */ 614 if (mad_agent->hi_tid) { 615 mad_agent_priv = container_of(mad_agent, 616 struct ib_mad_agent_private, 617 agent); 618 unregister_mad_agent(mad_agent_priv); 619 } else { 620 mad_snoop_priv = container_of(mad_agent, 621 struct ib_mad_snoop_private, 622 agent); 623 unregister_mad_snoop(mad_snoop_priv); 624 } 625 return 0; 626 } 627 EXPORT_SYMBOL(ib_unregister_mad_agent); 628 629 static void dequeue_mad(struct ib_mad_list_head *mad_list) 630 { 631 struct ib_mad_queue *mad_queue; 632 unsigned long flags; 633 634 BUG_ON(!mad_list->mad_queue); 635 mad_queue = mad_list->mad_queue; 636 spin_lock_irqsave(&mad_queue->lock, flags); 637 list_del(&mad_list->list); 638 mad_queue->count--; 639 spin_unlock_irqrestore(&mad_queue->lock, flags); 640 } 641 642 static void snoop_send(struct ib_mad_qp_info *qp_info, 643 struct ib_mad_send_buf *send_buf, 644 struct ib_mad_send_wc *mad_send_wc, 645 int mad_snoop_flags) 646 { 647 struct ib_mad_snoop_private *mad_snoop_priv; 648 unsigned long flags; 649 int i; 650 651 spin_lock_irqsave(&qp_info->snoop_lock, flags); 652 for (i = 0; i < qp_info->snoop_table_size; i++) { 653 mad_snoop_priv = qp_info->snoop_table[i]; 654 if (!mad_snoop_priv || 655 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags)) 656 continue; 657 658 atomic_inc(&mad_snoop_priv->refcount); 659 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 660 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent, 661 send_buf, mad_send_wc); 662 deref_snoop_agent(mad_snoop_priv); 663 spin_lock_irqsave(&qp_info->snoop_lock, flags); 664 } 665 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 666 } 667 668 static void snoop_recv(struct ib_mad_qp_info *qp_info, 669 struct ib_mad_recv_wc *mad_recv_wc, 670 int mad_snoop_flags) 671 { 672 struct ib_mad_snoop_private *mad_snoop_priv; 673 unsigned long flags; 674 int i; 675 676 spin_lock_irqsave(&qp_info->snoop_lock, flags); 677 for (i = 0; i < qp_info->snoop_table_size; i++) { 678 mad_snoop_priv = qp_info->snoop_table[i]; 679 if (!mad_snoop_priv || 680 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags)) 681 continue; 682 683 atomic_inc(&mad_snoop_priv->refcount); 684 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 685 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent, NULL, 686 mad_recv_wc); 687 deref_snoop_agent(mad_snoop_priv); 688 spin_lock_irqsave(&qp_info->snoop_lock, flags); 689 } 690 spin_unlock_irqrestore(&qp_info->snoop_lock, flags); 691 } 692 693 static void build_smp_wc(struct ib_qp *qp, struct ib_cqe *cqe, u16 slid, 694 u16 pkey_index, u8 port_num, struct ib_wc *wc) 695 { 696 memset(wc, 0, sizeof *wc); 697 wc->wr_cqe = cqe; 698 wc->status = IB_WC_SUCCESS; 699 wc->opcode = IB_WC_RECV; 700 wc->pkey_index = pkey_index; 701 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh); 702 wc->src_qp = IB_QP0; 703 wc->qp = qp; 704 wc->slid = slid; 705 wc->sl = 0; 706 wc->dlid_path_bits = 0; 707 wc->port_num = port_num; 708 } 709 710 static size_t mad_priv_size(const struct ib_mad_private *mp) 711 { 712 return sizeof(struct ib_mad_private) + mp->mad_size; 713 } 714 715 static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags) 716 { 717 size_t size = sizeof(struct ib_mad_private) + mad_size; 718 struct ib_mad_private *ret = kzalloc(size, flags); 719 720 if (ret) 721 ret->mad_size = mad_size; 722 723 return ret; 724 } 725 726 static size_t port_mad_size(const struct ib_mad_port_private *port_priv) 727 { 728 return rdma_max_mad_size(port_priv->device, port_priv->port_num); 729 } 730 731 static size_t mad_priv_dma_size(const struct ib_mad_private *mp) 732 { 733 return sizeof(struct ib_grh) + mp->mad_size; 734 } 735 736 /* 737 * Return 0 if SMP is to be sent 738 * Return 1 if SMP was consumed locally (whether or not solicited) 739 * Return < 0 if error 740 */ 741 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv, 742 struct ib_mad_send_wr_private *mad_send_wr) 743 { 744 int ret = 0; 745 struct ib_smp *smp = mad_send_wr->send_buf.mad; 746 struct opa_smp *opa_smp = (struct opa_smp *)smp; 747 unsigned long flags; 748 struct ib_mad_local_private *local; 749 struct ib_mad_private *mad_priv; 750 struct ib_mad_port_private *port_priv; 751 struct ib_mad_agent_private *recv_mad_agent = NULL; 752 struct ib_device *device = mad_agent_priv->agent.device; 753 u8 port_num; 754 struct ib_wc mad_wc; 755 struct ib_ud_wr *send_wr = &mad_send_wr->send_wr; 756 size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv); 757 u16 out_mad_pkey_index = 0; 758 u16 drslid; 759 bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device, 760 mad_agent_priv->qp_info->port_priv->port_num); 761 762 if (rdma_cap_ib_switch(device) && 763 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 764 port_num = send_wr->port_num; 765 else 766 port_num = mad_agent_priv->agent.port_num; 767 768 /* 769 * Directed route handling starts if the initial LID routed part of 770 * a request or the ending LID routed part of a response is empty. 771 * If we are at the start of the LID routed part, don't update the 772 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec. 773 */ 774 if (opa && smp->class_version == OPA_SM_CLASS_VERSION) { 775 u32 opa_drslid; 776 777 if ((opa_get_smp_direction(opa_smp) 778 ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) == 779 OPA_LID_PERMISSIVE && 780 opa_smi_handle_dr_smp_send(opa_smp, 781 rdma_cap_ib_switch(device), 782 port_num) == IB_SMI_DISCARD) { 783 ret = -EINVAL; 784 dev_err(&device->dev, "OPA Invalid directed route\n"); 785 goto out; 786 } 787 opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid); 788 if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) && 789 opa_drslid & 0xffff0000) { 790 ret = -EINVAL; 791 dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n", 792 opa_drslid); 793 goto out; 794 } 795 drslid = (u16)(opa_drslid & 0x0000ffff); 796 797 /* Check to post send on QP or process locally */ 798 if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD && 799 opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD) 800 goto out; 801 } else { 802 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) == 803 IB_LID_PERMISSIVE && 804 smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) == 805 IB_SMI_DISCARD) { 806 ret = -EINVAL; 807 dev_err(&device->dev, "Invalid directed route\n"); 808 goto out; 809 } 810 drslid = be16_to_cpu(smp->dr_slid); 811 812 /* Check to post send on QP or process locally */ 813 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD && 814 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD) 815 goto out; 816 } 817 818 local = kmalloc(sizeof *local, GFP_ATOMIC); 819 if (!local) { 820 ret = -ENOMEM; 821 goto out; 822 } 823 local->mad_priv = NULL; 824 local->recv_mad_agent = NULL; 825 mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC); 826 if (!mad_priv) { 827 ret = -ENOMEM; 828 kfree(local); 829 goto out; 830 } 831 832 build_smp_wc(mad_agent_priv->agent.qp, 833 send_wr->wr.wr_cqe, drslid, 834 send_wr->pkey_index, 835 send_wr->port_num, &mad_wc); 836 837 if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) { 838 mad_wc.byte_len = mad_send_wr->send_buf.hdr_len 839 + mad_send_wr->send_buf.data_len 840 + sizeof(struct ib_grh); 841 } 842 843 /* No GRH for DR SMP */ 844 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL, 845 (const struct ib_mad_hdr *)smp, mad_size, 846 (struct ib_mad_hdr *)mad_priv->mad, 847 &mad_size, &out_mad_pkey_index); 848 switch (ret) 849 { 850 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY: 851 if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) && 852 mad_agent_priv->agent.recv_handler) { 853 local->mad_priv = mad_priv; 854 local->recv_mad_agent = mad_agent_priv; 855 /* 856 * Reference MAD agent until receive 857 * side of local completion handled 858 */ 859 atomic_inc(&mad_agent_priv->refcount); 860 } else 861 kfree(mad_priv); 862 break; 863 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED: 864 kfree(mad_priv); 865 break; 866 case IB_MAD_RESULT_SUCCESS: 867 /* Treat like an incoming receive MAD */ 868 port_priv = ib_get_mad_port(mad_agent_priv->agent.device, 869 mad_agent_priv->agent.port_num); 870 if (port_priv) { 871 memcpy(mad_priv->mad, smp, mad_priv->mad_size); 872 recv_mad_agent = find_mad_agent(port_priv, 873 (const struct ib_mad_hdr *)mad_priv->mad); 874 } 875 if (!port_priv || !recv_mad_agent) { 876 /* 877 * No receiving agent so drop packet and 878 * generate send completion. 879 */ 880 kfree(mad_priv); 881 break; 882 } 883 local->mad_priv = mad_priv; 884 local->recv_mad_agent = recv_mad_agent; 885 break; 886 default: 887 kfree(mad_priv); 888 kfree(local); 889 ret = -EINVAL; 890 goto out; 891 } 892 893 local->mad_send_wr = mad_send_wr; 894 if (opa) { 895 local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index; 896 local->return_wc_byte_len = mad_size; 897 } 898 /* Reference MAD agent until send side of local completion handled */ 899 atomic_inc(&mad_agent_priv->refcount); 900 /* Queue local completion to local list */ 901 spin_lock_irqsave(&mad_agent_priv->lock, flags); 902 list_add_tail(&local->completion_list, &mad_agent_priv->local_list); 903 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 904 queue_work(mad_agent_priv->qp_info->port_priv->wq, 905 &mad_agent_priv->local_work); 906 ret = 1; 907 out: 908 return ret; 909 } 910 911 static int get_pad_size(int hdr_len, int data_len, size_t mad_size) 912 { 913 int seg_size, pad; 914 915 seg_size = mad_size - hdr_len; 916 if (data_len && seg_size) { 917 pad = seg_size - data_len % seg_size; 918 return pad == seg_size ? 0 : pad; 919 } else 920 return seg_size; 921 } 922 923 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr) 924 { 925 struct ib_rmpp_segment *s, *t; 926 927 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) { 928 list_del(&s->list); 929 kfree(s); 930 } 931 } 932 933 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr, 934 size_t mad_size, gfp_t gfp_mask) 935 { 936 struct ib_mad_send_buf *send_buf = &send_wr->send_buf; 937 struct ib_rmpp_mad *rmpp_mad = send_buf->mad; 938 struct ib_rmpp_segment *seg = NULL; 939 int left, seg_size, pad; 940 941 send_buf->seg_size = mad_size - send_buf->hdr_len; 942 send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR; 943 seg_size = send_buf->seg_size; 944 pad = send_wr->pad; 945 946 /* Allocate data segments. */ 947 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) { 948 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask); 949 if (!seg) { 950 free_send_rmpp_list(send_wr); 951 return -ENOMEM; 952 } 953 seg->num = ++send_buf->seg_count; 954 list_add_tail(&seg->list, &send_wr->rmpp_list); 955 } 956 957 /* Zero any padding */ 958 if (pad) 959 memset(seg->data + seg_size - pad, 0, pad); 960 961 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv-> 962 agent.rmpp_version; 963 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA; 964 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 965 966 send_wr->cur_seg = container_of(send_wr->rmpp_list.next, 967 struct ib_rmpp_segment, list); 968 send_wr->last_ack_seg = send_wr->cur_seg; 969 return 0; 970 } 971 972 int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent) 973 { 974 return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP); 975 } 976 EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent); 977 978 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent, 979 u32 remote_qpn, u16 pkey_index, 980 int rmpp_active, 981 int hdr_len, int data_len, 982 gfp_t gfp_mask, 983 u8 base_version) 984 { 985 struct ib_mad_agent_private *mad_agent_priv; 986 struct ib_mad_send_wr_private *mad_send_wr; 987 int pad, message_size, ret, size; 988 void *buf; 989 size_t mad_size; 990 bool opa; 991 992 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, 993 agent); 994 995 opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num); 996 997 if (opa && base_version == OPA_MGMT_BASE_VERSION) 998 mad_size = sizeof(struct opa_mad); 999 else 1000 mad_size = sizeof(struct ib_mad); 1001 1002 pad = get_pad_size(hdr_len, data_len, mad_size); 1003 message_size = hdr_len + data_len + pad; 1004 1005 if (ib_mad_kernel_rmpp_agent(mad_agent)) { 1006 if (!rmpp_active && message_size > mad_size) 1007 return ERR_PTR(-EINVAL); 1008 } else 1009 if (rmpp_active || message_size > mad_size) 1010 return ERR_PTR(-EINVAL); 1011 1012 size = rmpp_active ? hdr_len : mad_size; 1013 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask); 1014 if (!buf) 1015 return ERR_PTR(-ENOMEM); 1016 1017 mad_send_wr = buf + size; 1018 INIT_LIST_HEAD(&mad_send_wr->rmpp_list); 1019 mad_send_wr->send_buf.mad = buf; 1020 mad_send_wr->send_buf.hdr_len = hdr_len; 1021 mad_send_wr->send_buf.data_len = data_len; 1022 mad_send_wr->pad = pad; 1023 1024 mad_send_wr->mad_agent_priv = mad_agent_priv; 1025 mad_send_wr->sg_list[0].length = hdr_len; 1026 mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey; 1027 1028 /* OPA MADs don't have to be the full 2048 bytes */ 1029 if (opa && base_version == OPA_MGMT_BASE_VERSION && 1030 data_len < mad_size - hdr_len) 1031 mad_send_wr->sg_list[1].length = data_len; 1032 else 1033 mad_send_wr->sg_list[1].length = mad_size - hdr_len; 1034 1035 mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey; 1036 1037 mad_send_wr->mad_list.cqe.done = ib_mad_send_done; 1038 1039 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe; 1040 mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list; 1041 mad_send_wr->send_wr.wr.num_sge = 2; 1042 mad_send_wr->send_wr.wr.opcode = IB_WR_SEND; 1043 mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED; 1044 mad_send_wr->send_wr.remote_qpn = remote_qpn; 1045 mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY; 1046 mad_send_wr->send_wr.pkey_index = pkey_index; 1047 1048 if (rmpp_active) { 1049 ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask); 1050 if (ret) { 1051 kfree(buf); 1052 return ERR_PTR(ret); 1053 } 1054 } 1055 1056 mad_send_wr->send_buf.mad_agent = mad_agent; 1057 atomic_inc(&mad_agent_priv->refcount); 1058 return &mad_send_wr->send_buf; 1059 } 1060 EXPORT_SYMBOL(ib_create_send_mad); 1061 1062 int ib_get_mad_data_offset(u8 mgmt_class) 1063 { 1064 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM) 1065 return IB_MGMT_SA_HDR; 1066 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) || 1067 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) || 1068 (mgmt_class == IB_MGMT_CLASS_BIS)) 1069 return IB_MGMT_DEVICE_HDR; 1070 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && 1071 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)) 1072 return IB_MGMT_VENDOR_HDR; 1073 else 1074 return IB_MGMT_MAD_HDR; 1075 } 1076 EXPORT_SYMBOL(ib_get_mad_data_offset); 1077 1078 int ib_is_mad_class_rmpp(u8 mgmt_class) 1079 { 1080 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) || 1081 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) || 1082 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) || 1083 (mgmt_class == IB_MGMT_CLASS_BIS) || 1084 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && 1085 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))) 1086 return 1; 1087 return 0; 1088 } 1089 EXPORT_SYMBOL(ib_is_mad_class_rmpp); 1090 1091 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num) 1092 { 1093 struct ib_mad_send_wr_private *mad_send_wr; 1094 struct list_head *list; 1095 1096 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private, 1097 send_buf); 1098 list = &mad_send_wr->cur_seg->list; 1099 1100 if (mad_send_wr->cur_seg->num < seg_num) { 1101 list_for_each_entry(mad_send_wr->cur_seg, list, list) 1102 if (mad_send_wr->cur_seg->num == seg_num) 1103 break; 1104 } else if (mad_send_wr->cur_seg->num > seg_num) { 1105 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list) 1106 if (mad_send_wr->cur_seg->num == seg_num) 1107 break; 1108 } 1109 return mad_send_wr->cur_seg->data; 1110 } 1111 EXPORT_SYMBOL(ib_get_rmpp_segment); 1112 1113 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr) 1114 { 1115 if (mad_send_wr->send_buf.seg_count) 1116 return ib_get_rmpp_segment(&mad_send_wr->send_buf, 1117 mad_send_wr->seg_num); 1118 else 1119 return mad_send_wr->send_buf.mad + 1120 mad_send_wr->send_buf.hdr_len; 1121 } 1122 1123 void ib_free_send_mad(struct ib_mad_send_buf *send_buf) 1124 { 1125 struct ib_mad_agent_private *mad_agent_priv; 1126 struct ib_mad_send_wr_private *mad_send_wr; 1127 1128 mad_agent_priv = container_of(send_buf->mad_agent, 1129 struct ib_mad_agent_private, agent); 1130 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private, 1131 send_buf); 1132 1133 free_send_rmpp_list(mad_send_wr); 1134 kfree(send_buf->mad); 1135 deref_mad_agent(mad_agent_priv); 1136 } 1137 EXPORT_SYMBOL(ib_free_send_mad); 1138 1139 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr) 1140 { 1141 struct ib_mad_qp_info *qp_info; 1142 struct list_head *list; 1143 struct ib_send_wr *bad_send_wr; 1144 struct ib_mad_agent *mad_agent; 1145 struct ib_sge *sge; 1146 unsigned long flags; 1147 int ret; 1148 1149 /* Set WR ID to find mad_send_wr upon completion */ 1150 qp_info = mad_send_wr->mad_agent_priv->qp_info; 1151 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue; 1152 mad_send_wr->mad_list.cqe.done = ib_mad_send_done; 1153 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe; 1154 1155 mad_agent = mad_send_wr->send_buf.mad_agent; 1156 sge = mad_send_wr->sg_list; 1157 sge[0].addr = ib_dma_map_single(mad_agent->device, 1158 mad_send_wr->send_buf.mad, 1159 sge[0].length, 1160 DMA_TO_DEVICE); 1161 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr))) 1162 return -ENOMEM; 1163 1164 mad_send_wr->header_mapping = sge[0].addr; 1165 1166 sge[1].addr = ib_dma_map_single(mad_agent->device, 1167 ib_get_payload(mad_send_wr), 1168 sge[1].length, 1169 DMA_TO_DEVICE); 1170 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) { 1171 ib_dma_unmap_single(mad_agent->device, 1172 mad_send_wr->header_mapping, 1173 sge[0].length, DMA_TO_DEVICE); 1174 return -ENOMEM; 1175 } 1176 mad_send_wr->payload_mapping = sge[1].addr; 1177 1178 spin_lock_irqsave(&qp_info->send_queue.lock, flags); 1179 if (qp_info->send_queue.count < qp_info->send_queue.max_active) { 1180 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr, 1181 &bad_send_wr); 1182 list = &qp_info->send_queue.list; 1183 } else { 1184 ret = 0; 1185 list = &qp_info->overflow_list; 1186 } 1187 1188 if (!ret) { 1189 qp_info->send_queue.count++; 1190 list_add_tail(&mad_send_wr->mad_list.list, list); 1191 } 1192 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); 1193 if (ret) { 1194 ib_dma_unmap_single(mad_agent->device, 1195 mad_send_wr->header_mapping, 1196 sge[0].length, DMA_TO_DEVICE); 1197 ib_dma_unmap_single(mad_agent->device, 1198 mad_send_wr->payload_mapping, 1199 sge[1].length, DMA_TO_DEVICE); 1200 } 1201 return ret; 1202 } 1203 1204 /* 1205 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated 1206 * with the registered client 1207 */ 1208 int ib_post_send_mad(struct ib_mad_send_buf *send_buf, 1209 struct ib_mad_send_buf **bad_send_buf) 1210 { 1211 struct ib_mad_agent_private *mad_agent_priv; 1212 struct ib_mad_send_buf *next_send_buf; 1213 struct ib_mad_send_wr_private *mad_send_wr; 1214 unsigned long flags; 1215 int ret = -EINVAL; 1216 1217 /* Walk list of send WRs and post each on send list */ 1218 for (; send_buf; send_buf = next_send_buf) { 1219 1220 mad_send_wr = container_of(send_buf, 1221 struct ib_mad_send_wr_private, 1222 send_buf); 1223 mad_agent_priv = mad_send_wr->mad_agent_priv; 1224 1225 if (!send_buf->mad_agent->send_handler || 1226 (send_buf->timeout_ms && 1227 !send_buf->mad_agent->recv_handler)) { 1228 ret = -EINVAL; 1229 goto error; 1230 } 1231 1232 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) { 1233 if (mad_agent_priv->agent.rmpp_version) { 1234 ret = -EINVAL; 1235 goto error; 1236 } 1237 } 1238 1239 /* 1240 * Save pointer to next work request to post in case the 1241 * current one completes, and the user modifies the work 1242 * request associated with the completion 1243 */ 1244 next_send_buf = send_buf->next; 1245 mad_send_wr->send_wr.ah = send_buf->ah; 1246 1247 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class == 1248 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 1249 ret = handle_outgoing_dr_smp(mad_agent_priv, 1250 mad_send_wr); 1251 if (ret < 0) /* error */ 1252 goto error; 1253 else if (ret == 1) /* locally consumed */ 1254 continue; 1255 } 1256 1257 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid; 1258 /* Timeout will be updated after send completes */ 1259 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms); 1260 mad_send_wr->max_retries = send_buf->retries; 1261 mad_send_wr->retries_left = send_buf->retries; 1262 send_buf->retries = 0; 1263 /* Reference for work request to QP + response */ 1264 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0); 1265 mad_send_wr->status = IB_WC_SUCCESS; 1266 1267 /* Reference MAD agent until send completes */ 1268 atomic_inc(&mad_agent_priv->refcount); 1269 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1270 list_add_tail(&mad_send_wr->agent_list, 1271 &mad_agent_priv->send_list); 1272 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1273 1274 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) { 1275 ret = ib_send_rmpp_mad(mad_send_wr); 1276 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED) 1277 ret = ib_send_mad(mad_send_wr); 1278 } else 1279 ret = ib_send_mad(mad_send_wr); 1280 if (ret < 0) { 1281 /* Fail send request */ 1282 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1283 list_del(&mad_send_wr->agent_list); 1284 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1285 atomic_dec(&mad_agent_priv->refcount); 1286 goto error; 1287 } 1288 } 1289 return 0; 1290 error: 1291 if (bad_send_buf) 1292 *bad_send_buf = send_buf; 1293 return ret; 1294 } 1295 EXPORT_SYMBOL(ib_post_send_mad); 1296 1297 /* 1298 * ib_free_recv_mad - Returns data buffers used to receive 1299 * a MAD to the access layer 1300 */ 1301 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc) 1302 { 1303 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf; 1304 struct ib_mad_private_header *mad_priv_hdr; 1305 struct ib_mad_private *priv; 1306 struct list_head free_list; 1307 1308 INIT_LIST_HEAD(&free_list); 1309 list_splice_init(&mad_recv_wc->rmpp_list, &free_list); 1310 1311 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf, 1312 &free_list, list) { 1313 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc, 1314 recv_buf); 1315 mad_priv_hdr = container_of(mad_recv_wc, 1316 struct ib_mad_private_header, 1317 recv_wc); 1318 priv = container_of(mad_priv_hdr, struct ib_mad_private, 1319 header); 1320 kfree(priv); 1321 } 1322 } 1323 EXPORT_SYMBOL(ib_free_recv_mad); 1324 1325 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp, 1326 u8 rmpp_version, 1327 ib_mad_send_handler send_handler, 1328 ib_mad_recv_handler recv_handler, 1329 void *context) 1330 { 1331 return ERR_PTR(-EINVAL); /* XXX: for now */ 1332 } 1333 EXPORT_SYMBOL(ib_redirect_mad_qp); 1334 1335 int ib_process_mad_wc(struct ib_mad_agent *mad_agent, 1336 struct ib_wc *wc) 1337 { 1338 dev_err(&mad_agent->device->dev, 1339 "ib_process_mad_wc() not implemented yet\n"); 1340 return 0; 1341 } 1342 EXPORT_SYMBOL(ib_process_mad_wc); 1343 1344 static int method_in_use(struct ib_mad_mgmt_method_table **method, 1345 struct ib_mad_reg_req *mad_reg_req) 1346 { 1347 int i; 1348 1349 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) { 1350 if ((*method)->agent[i]) { 1351 pr_err("Method %d already in use\n", i); 1352 return -EINVAL; 1353 } 1354 } 1355 return 0; 1356 } 1357 1358 static int allocate_method_table(struct ib_mad_mgmt_method_table **method) 1359 { 1360 /* Allocate management method table */ 1361 *method = kzalloc(sizeof **method, GFP_ATOMIC); 1362 return (*method) ? 0 : (-ENOMEM); 1363 } 1364 1365 /* 1366 * Check to see if there are any methods still in use 1367 */ 1368 static int check_method_table(struct ib_mad_mgmt_method_table *method) 1369 { 1370 int i; 1371 1372 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) 1373 if (method->agent[i]) 1374 return 1; 1375 return 0; 1376 } 1377 1378 /* 1379 * Check to see if there are any method tables for this class still in use 1380 */ 1381 static int check_class_table(struct ib_mad_mgmt_class_table *class) 1382 { 1383 int i; 1384 1385 for (i = 0; i < MAX_MGMT_CLASS; i++) 1386 if (class->method_table[i]) 1387 return 1; 1388 return 0; 1389 } 1390 1391 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class) 1392 { 1393 int i; 1394 1395 for (i = 0; i < MAX_MGMT_OUI; i++) 1396 if (vendor_class->method_table[i]) 1397 return 1; 1398 return 0; 1399 } 1400 1401 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class, 1402 const char *oui) 1403 { 1404 int i; 1405 1406 for (i = 0; i < MAX_MGMT_OUI; i++) 1407 /* Is there matching OUI for this vendor class ? */ 1408 if (!memcmp(vendor_class->oui[i], oui, 3)) 1409 return i; 1410 1411 return -1; 1412 } 1413 1414 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor) 1415 { 1416 int i; 1417 1418 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++) 1419 if (vendor->vendor_class[i]) 1420 return 1; 1421 1422 return 0; 1423 } 1424 1425 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method, 1426 struct ib_mad_agent_private *agent) 1427 { 1428 int i; 1429 1430 /* Remove any methods for this mad agent */ 1431 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) { 1432 if (method->agent[i] == agent) { 1433 method->agent[i] = NULL; 1434 } 1435 } 1436 } 1437 1438 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req, 1439 struct ib_mad_agent_private *agent_priv, 1440 u8 mgmt_class) 1441 { 1442 struct ib_mad_port_private *port_priv; 1443 struct ib_mad_mgmt_class_table **class; 1444 struct ib_mad_mgmt_method_table **method; 1445 int i, ret; 1446 1447 port_priv = agent_priv->qp_info->port_priv; 1448 class = &port_priv->version[mad_reg_req->mgmt_class_version].class; 1449 if (!*class) { 1450 /* Allocate management class table for "new" class version */ 1451 *class = kzalloc(sizeof **class, GFP_ATOMIC); 1452 if (!*class) { 1453 ret = -ENOMEM; 1454 goto error1; 1455 } 1456 1457 /* Allocate method table for this management class */ 1458 method = &(*class)->method_table[mgmt_class]; 1459 if ((ret = allocate_method_table(method))) 1460 goto error2; 1461 } else { 1462 method = &(*class)->method_table[mgmt_class]; 1463 if (!*method) { 1464 /* Allocate method table for this management class */ 1465 if ((ret = allocate_method_table(method))) 1466 goto error1; 1467 } 1468 } 1469 1470 /* Now, make sure methods are not already in use */ 1471 if (method_in_use(method, mad_reg_req)) 1472 goto error3; 1473 1474 /* Finally, add in methods being registered */ 1475 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) 1476 (*method)->agent[i] = agent_priv; 1477 1478 return 0; 1479 1480 error3: 1481 /* Remove any methods for this mad agent */ 1482 remove_methods_mad_agent(*method, agent_priv); 1483 /* Now, check to see if there are any methods in use */ 1484 if (!check_method_table(*method)) { 1485 /* If not, release management method table */ 1486 kfree(*method); 1487 *method = NULL; 1488 } 1489 ret = -EINVAL; 1490 goto error1; 1491 error2: 1492 kfree(*class); 1493 *class = NULL; 1494 error1: 1495 return ret; 1496 } 1497 1498 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req, 1499 struct ib_mad_agent_private *agent_priv) 1500 { 1501 struct ib_mad_port_private *port_priv; 1502 struct ib_mad_mgmt_vendor_class_table **vendor_table; 1503 struct ib_mad_mgmt_vendor_class_table *vendor = NULL; 1504 struct ib_mad_mgmt_vendor_class *vendor_class = NULL; 1505 struct ib_mad_mgmt_method_table **method; 1506 int i, ret = -ENOMEM; 1507 u8 vclass; 1508 1509 /* "New" vendor (with OUI) class */ 1510 vclass = vendor_class_index(mad_reg_req->mgmt_class); 1511 port_priv = agent_priv->qp_info->port_priv; 1512 vendor_table = &port_priv->version[ 1513 mad_reg_req->mgmt_class_version].vendor; 1514 if (!*vendor_table) { 1515 /* Allocate mgmt vendor class table for "new" class version */ 1516 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC); 1517 if (!vendor) 1518 goto error1; 1519 1520 *vendor_table = vendor; 1521 } 1522 if (!(*vendor_table)->vendor_class[vclass]) { 1523 /* Allocate table for this management vendor class */ 1524 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC); 1525 if (!vendor_class) 1526 goto error2; 1527 1528 (*vendor_table)->vendor_class[vclass] = vendor_class; 1529 } 1530 for (i = 0; i < MAX_MGMT_OUI; i++) { 1531 /* Is there matching OUI for this vendor class ? */ 1532 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i], 1533 mad_reg_req->oui, 3)) { 1534 method = &(*vendor_table)->vendor_class[ 1535 vclass]->method_table[i]; 1536 BUG_ON(!*method); 1537 goto check_in_use; 1538 } 1539 } 1540 for (i = 0; i < MAX_MGMT_OUI; i++) { 1541 /* OUI slot available ? */ 1542 if (!is_vendor_oui((*vendor_table)->vendor_class[ 1543 vclass]->oui[i])) { 1544 method = &(*vendor_table)->vendor_class[ 1545 vclass]->method_table[i]; 1546 BUG_ON(*method); 1547 /* Allocate method table for this OUI */ 1548 if ((ret = allocate_method_table(method))) 1549 goto error3; 1550 memcpy((*vendor_table)->vendor_class[vclass]->oui[i], 1551 mad_reg_req->oui, 3); 1552 goto check_in_use; 1553 } 1554 } 1555 dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n"); 1556 goto error3; 1557 1558 check_in_use: 1559 /* Now, make sure methods are not already in use */ 1560 if (method_in_use(method, mad_reg_req)) 1561 goto error4; 1562 1563 /* Finally, add in methods being registered */ 1564 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) 1565 (*method)->agent[i] = agent_priv; 1566 1567 return 0; 1568 1569 error4: 1570 /* Remove any methods for this mad agent */ 1571 remove_methods_mad_agent(*method, agent_priv); 1572 /* Now, check to see if there are any methods in use */ 1573 if (!check_method_table(*method)) { 1574 /* If not, release management method table */ 1575 kfree(*method); 1576 *method = NULL; 1577 } 1578 ret = -EINVAL; 1579 error3: 1580 if (vendor_class) { 1581 (*vendor_table)->vendor_class[vclass] = NULL; 1582 kfree(vendor_class); 1583 } 1584 error2: 1585 if (vendor) { 1586 *vendor_table = NULL; 1587 kfree(vendor); 1588 } 1589 error1: 1590 return ret; 1591 } 1592 1593 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv) 1594 { 1595 struct ib_mad_port_private *port_priv; 1596 struct ib_mad_mgmt_class_table *class; 1597 struct ib_mad_mgmt_method_table *method; 1598 struct ib_mad_mgmt_vendor_class_table *vendor; 1599 struct ib_mad_mgmt_vendor_class *vendor_class; 1600 int index; 1601 u8 mgmt_class; 1602 1603 /* 1604 * Was MAD registration request supplied 1605 * with original registration ? 1606 */ 1607 if (!agent_priv->reg_req) { 1608 goto out; 1609 } 1610 1611 port_priv = agent_priv->qp_info->port_priv; 1612 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class); 1613 class = port_priv->version[ 1614 agent_priv->reg_req->mgmt_class_version].class; 1615 if (!class) 1616 goto vendor_check; 1617 1618 method = class->method_table[mgmt_class]; 1619 if (method) { 1620 /* Remove any methods for this mad agent */ 1621 remove_methods_mad_agent(method, agent_priv); 1622 /* Now, check to see if there are any methods still in use */ 1623 if (!check_method_table(method)) { 1624 /* If not, release management method table */ 1625 kfree(method); 1626 class->method_table[mgmt_class] = NULL; 1627 /* Any management classes left ? */ 1628 if (!check_class_table(class)) { 1629 /* If not, release management class table */ 1630 kfree(class); 1631 port_priv->version[ 1632 agent_priv->reg_req-> 1633 mgmt_class_version].class = NULL; 1634 } 1635 } 1636 } 1637 1638 vendor_check: 1639 if (!is_vendor_class(mgmt_class)) 1640 goto out; 1641 1642 /* normalize mgmt_class to vendor range 2 */ 1643 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class); 1644 vendor = port_priv->version[ 1645 agent_priv->reg_req->mgmt_class_version].vendor; 1646 1647 if (!vendor) 1648 goto out; 1649 1650 vendor_class = vendor->vendor_class[mgmt_class]; 1651 if (vendor_class) { 1652 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui); 1653 if (index < 0) 1654 goto out; 1655 method = vendor_class->method_table[index]; 1656 if (method) { 1657 /* Remove any methods for this mad agent */ 1658 remove_methods_mad_agent(method, agent_priv); 1659 /* 1660 * Now, check to see if there are 1661 * any methods still in use 1662 */ 1663 if (!check_method_table(method)) { 1664 /* If not, release management method table */ 1665 kfree(method); 1666 vendor_class->method_table[index] = NULL; 1667 memset(vendor_class->oui[index], 0, 3); 1668 /* Any OUIs left ? */ 1669 if (!check_vendor_class(vendor_class)) { 1670 /* If not, release vendor class table */ 1671 kfree(vendor_class); 1672 vendor->vendor_class[mgmt_class] = NULL; 1673 /* Any other vendor classes left ? */ 1674 if (!check_vendor_table(vendor)) { 1675 kfree(vendor); 1676 port_priv->version[ 1677 agent_priv->reg_req-> 1678 mgmt_class_version]. 1679 vendor = NULL; 1680 } 1681 } 1682 } 1683 } 1684 } 1685 1686 out: 1687 return; 1688 } 1689 1690 static struct ib_mad_agent_private * 1691 find_mad_agent(struct ib_mad_port_private *port_priv, 1692 const struct ib_mad_hdr *mad_hdr) 1693 { 1694 struct ib_mad_agent_private *mad_agent = NULL; 1695 unsigned long flags; 1696 1697 spin_lock_irqsave(&port_priv->reg_lock, flags); 1698 if (ib_response_mad(mad_hdr)) { 1699 u32 hi_tid; 1700 struct ib_mad_agent_private *entry; 1701 1702 /* 1703 * Routing is based on high 32 bits of transaction ID 1704 * of MAD. 1705 */ 1706 hi_tid = be64_to_cpu(mad_hdr->tid) >> 32; 1707 list_for_each_entry(entry, &port_priv->agent_list, agent_list) { 1708 if (entry->agent.hi_tid == hi_tid) { 1709 mad_agent = entry; 1710 break; 1711 } 1712 } 1713 } else { 1714 struct ib_mad_mgmt_class_table *class; 1715 struct ib_mad_mgmt_method_table *method; 1716 struct ib_mad_mgmt_vendor_class_table *vendor; 1717 struct ib_mad_mgmt_vendor_class *vendor_class; 1718 const struct ib_vendor_mad *vendor_mad; 1719 int index; 1720 1721 /* 1722 * Routing is based on version, class, and method 1723 * For "newer" vendor MADs, also based on OUI 1724 */ 1725 if (mad_hdr->class_version >= MAX_MGMT_VERSION) 1726 goto out; 1727 if (!is_vendor_class(mad_hdr->mgmt_class)) { 1728 class = port_priv->version[ 1729 mad_hdr->class_version].class; 1730 if (!class) 1731 goto out; 1732 if (convert_mgmt_class(mad_hdr->mgmt_class) >= 1733 ARRAY_SIZE(class->method_table)) 1734 goto out; 1735 method = class->method_table[convert_mgmt_class( 1736 mad_hdr->mgmt_class)]; 1737 if (method) 1738 mad_agent = method->agent[mad_hdr->method & 1739 ~IB_MGMT_METHOD_RESP]; 1740 } else { 1741 vendor = port_priv->version[ 1742 mad_hdr->class_version].vendor; 1743 if (!vendor) 1744 goto out; 1745 vendor_class = vendor->vendor_class[vendor_class_index( 1746 mad_hdr->mgmt_class)]; 1747 if (!vendor_class) 1748 goto out; 1749 /* Find matching OUI */ 1750 vendor_mad = (const struct ib_vendor_mad *)mad_hdr; 1751 index = find_vendor_oui(vendor_class, vendor_mad->oui); 1752 if (index == -1) 1753 goto out; 1754 method = vendor_class->method_table[index]; 1755 if (method) { 1756 mad_agent = method->agent[mad_hdr->method & 1757 ~IB_MGMT_METHOD_RESP]; 1758 } 1759 } 1760 } 1761 1762 if (mad_agent) { 1763 if (mad_agent->agent.recv_handler) 1764 atomic_inc(&mad_agent->refcount); 1765 else { 1766 dev_notice(&port_priv->device->dev, 1767 "No receive handler for client %p on port %d\n", 1768 &mad_agent->agent, port_priv->port_num); 1769 mad_agent = NULL; 1770 } 1771 } 1772 out: 1773 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 1774 1775 return mad_agent; 1776 } 1777 1778 static int validate_mad(const struct ib_mad_hdr *mad_hdr, 1779 const struct ib_mad_qp_info *qp_info, 1780 bool opa) 1781 { 1782 int valid = 0; 1783 u32 qp_num = qp_info->qp->qp_num; 1784 1785 /* Make sure MAD base version is understood */ 1786 if (mad_hdr->base_version != IB_MGMT_BASE_VERSION && 1787 (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) { 1788 pr_err("MAD received with unsupported base version %d %s\n", 1789 mad_hdr->base_version, opa ? "(opa)" : ""); 1790 goto out; 1791 } 1792 1793 /* Filter SMI packets sent to other than QP0 */ 1794 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) || 1795 (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) { 1796 if (qp_num == 0) 1797 valid = 1; 1798 } else { 1799 /* CM attributes other than ClassPortInfo only use Send method */ 1800 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_CM) && 1801 (mad_hdr->attr_id != IB_MGMT_CLASSPORTINFO_ATTR_ID) && 1802 (mad_hdr->method != IB_MGMT_METHOD_SEND)) 1803 goto out; 1804 /* Filter GSI packets sent to QP0 */ 1805 if (qp_num != 0) 1806 valid = 1; 1807 } 1808 1809 out: 1810 return valid; 1811 } 1812 1813 static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv, 1814 const struct ib_mad_hdr *mad_hdr) 1815 { 1816 struct ib_rmpp_mad *rmpp_mad; 1817 1818 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr; 1819 return !mad_agent_priv->agent.rmpp_version || 1820 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) || 1821 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 1822 IB_MGMT_RMPP_FLAG_ACTIVE) || 1823 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA); 1824 } 1825 1826 static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr, 1827 const struct ib_mad_recv_wc *rwc) 1828 { 1829 return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class == 1830 rwc->recv_buf.mad->mad_hdr.mgmt_class; 1831 } 1832 1833 static inline int rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv, 1834 const struct ib_mad_send_wr_private *wr, 1835 const struct ib_mad_recv_wc *rwc ) 1836 { 1837 struct ib_ah_attr attr; 1838 u8 send_resp, rcv_resp; 1839 union ib_gid sgid; 1840 struct ib_device *device = mad_agent_priv->agent.device; 1841 u8 port_num = mad_agent_priv->agent.port_num; 1842 u8 lmc; 1843 1844 send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad); 1845 rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr); 1846 1847 if (send_resp == rcv_resp) 1848 /* both requests, or both responses. GIDs different */ 1849 return 0; 1850 1851 if (ib_query_ah(wr->send_buf.ah, &attr)) 1852 /* Assume not equal, to avoid false positives. */ 1853 return 0; 1854 1855 if (!!(attr.ah_flags & IB_AH_GRH) != 1856 !!(rwc->wc->wc_flags & IB_WC_GRH)) 1857 /* one has GID, other does not. Assume different */ 1858 return 0; 1859 1860 if (!send_resp && rcv_resp) { 1861 /* is request/response. */ 1862 if (!(attr.ah_flags & IB_AH_GRH)) { 1863 if (ib_get_cached_lmc(device, port_num, &lmc)) 1864 return 0; 1865 return (!lmc || !((attr.src_path_bits ^ 1866 rwc->wc->dlid_path_bits) & 1867 ((1 << lmc) - 1))); 1868 } else { 1869 if (ib_get_cached_gid(device, port_num, 1870 attr.grh.sgid_index, &sgid, NULL)) 1871 return 0; 1872 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw, 1873 16); 1874 } 1875 } 1876 1877 if (!(attr.ah_flags & IB_AH_GRH)) 1878 return attr.dlid == rwc->wc->slid; 1879 else 1880 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw, 1881 16); 1882 } 1883 1884 static inline int is_direct(u8 class) 1885 { 1886 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE); 1887 } 1888 1889 struct ib_mad_send_wr_private* 1890 ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv, 1891 const struct ib_mad_recv_wc *wc) 1892 { 1893 struct ib_mad_send_wr_private *wr; 1894 const struct ib_mad_hdr *mad_hdr; 1895 1896 mad_hdr = &wc->recv_buf.mad->mad_hdr; 1897 1898 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) { 1899 if ((wr->tid == mad_hdr->tid) && 1900 rcv_has_same_class(wr, wc) && 1901 /* 1902 * Don't check GID for direct routed MADs. 1903 * These might have permissive LIDs. 1904 */ 1905 (is_direct(mad_hdr->mgmt_class) || 1906 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1907 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1908 } 1909 1910 /* 1911 * It's possible to receive the response before we've 1912 * been notified that the send has completed 1913 */ 1914 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) { 1915 if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) && 1916 wr->tid == mad_hdr->tid && 1917 wr->timeout && 1918 rcv_has_same_class(wr, wc) && 1919 /* 1920 * Don't check GID for direct routed MADs. 1921 * These might have permissive LIDs. 1922 */ 1923 (is_direct(mad_hdr->mgmt_class) || 1924 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1925 /* Verify request has not been canceled */ 1926 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1927 } 1928 return NULL; 1929 } 1930 1931 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr) 1932 { 1933 mad_send_wr->timeout = 0; 1934 if (mad_send_wr->refcount == 1) 1935 list_move_tail(&mad_send_wr->agent_list, 1936 &mad_send_wr->mad_agent_priv->done_list); 1937 } 1938 1939 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv, 1940 struct ib_mad_recv_wc *mad_recv_wc) 1941 { 1942 struct ib_mad_send_wr_private *mad_send_wr; 1943 struct ib_mad_send_wc mad_send_wc; 1944 unsigned long flags; 1945 1946 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list); 1947 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list); 1948 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) { 1949 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv, 1950 mad_recv_wc); 1951 if (!mad_recv_wc) { 1952 deref_mad_agent(mad_agent_priv); 1953 return; 1954 } 1955 } 1956 1957 /* Complete corresponding request */ 1958 if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) { 1959 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1960 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc); 1961 if (!mad_send_wr) { 1962 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1963 if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) 1964 && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class) 1965 && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr) 1966 & IB_MGMT_RMPP_FLAG_ACTIVE)) { 1967 /* user rmpp is in effect 1968 * and this is an active RMPP MAD 1969 */ 1970 mad_agent_priv->agent.recv_handler( 1971 &mad_agent_priv->agent, NULL, 1972 mad_recv_wc); 1973 atomic_dec(&mad_agent_priv->refcount); 1974 } else { 1975 /* not user rmpp, revert to normal behavior and 1976 * drop the mad */ 1977 ib_free_recv_mad(mad_recv_wc); 1978 deref_mad_agent(mad_agent_priv); 1979 return; 1980 } 1981 } else { 1982 ib_mark_mad_done(mad_send_wr); 1983 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1984 1985 /* Defined behavior is to complete response before request */ 1986 mad_agent_priv->agent.recv_handler( 1987 &mad_agent_priv->agent, 1988 &mad_send_wr->send_buf, 1989 mad_recv_wc); 1990 atomic_dec(&mad_agent_priv->refcount); 1991 1992 mad_send_wc.status = IB_WC_SUCCESS; 1993 mad_send_wc.vendor_err = 0; 1994 mad_send_wc.send_buf = &mad_send_wr->send_buf; 1995 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 1996 } 1997 } else { 1998 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, NULL, 1999 mad_recv_wc); 2000 deref_mad_agent(mad_agent_priv); 2001 } 2002 } 2003 2004 static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv, 2005 const struct ib_mad_qp_info *qp_info, 2006 const struct ib_wc *wc, 2007 int port_num, 2008 struct ib_mad_private *recv, 2009 struct ib_mad_private *response) 2010 { 2011 enum smi_forward_action retsmi; 2012 struct ib_smp *smp = (struct ib_smp *)recv->mad; 2013 2014 if (smi_handle_dr_smp_recv(smp, 2015 rdma_cap_ib_switch(port_priv->device), 2016 port_num, 2017 port_priv->device->phys_port_cnt) == 2018 IB_SMI_DISCARD) 2019 return IB_SMI_DISCARD; 2020 2021 retsmi = smi_check_forward_dr_smp(smp); 2022 if (retsmi == IB_SMI_LOCAL) 2023 return IB_SMI_HANDLE; 2024 2025 if (retsmi == IB_SMI_SEND) { /* don't forward */ 2026 if (smi_handle_dr_smp_send(smp, 2027 rdma_cap_ib_switch(port_priv->device), 2028 port_num) == IB_SMI_DISCARD) 2029 return IB_SMI_DISCARD; 2030 2031 if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD) 2032 return IB_SMI_DISCARD; 2033 } else if (rdma_cap_ib_switch(port_priv->device)) { 2034 /* forward case for switches */ 2035 memcpy(response, recv, mad_priv_size(response)); 2036 response->header.recv_wc.wc = &response->header.wc; 2037 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad; 2038 response->header.recv_wc.recv_buf.grh = &response->grh; 2039 2040 agent_send_response((const struct ib_mad_hdr *)response->mad, 2041 &response->grh, wc, 2042 port_priv->device, 2043 smi_get_fwd_port(smp), 2044 qp_info->qp->qp_num, 2045 response->mad_size, 2046 false); 2047 2048 return IB_SMI_DISCARD; 2049 } 2050 return IB_SMI_HANDLE; 2051 } 2052 2053 static bool generate_unmatched_resp(const struct ib_mad_private *recv, 2054 struct ib_mad_private *response, 2055 size_t *resp_len, bool opa) 2056 { 2057 const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad; 2058 struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad; 2059 2060 if (recv_hdr->method == IB_MGMT_METHOD_GET || 2061 recv_hdr->method == IB_MGMT_METHOD_SET) { 2062 memcpy(response, recv, mad_priv_size(response)); 2063 response->header.recv_wc.wc = &response->header.wc; 2064 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad; 2065 response->header.recv_wc.recv_buf.grh = &response->grh; 2066 resp_hdr->method = IB_MGMT_METHOD_GET_RESP; 2067 resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB); 2068 if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 2069 resp_hdr->status |= IB_SMP_DIRECTION; 2070 2071 if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) { 2072 if (recv_hdr->mgmt_class == 2073 IB_MGMT_CLASS_SUBN_LID_ROUTED || 2074 recv_hdr->mgmt_class == 2075 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 2076 *resp_len = opa_get_smp_header_size( 2077 (struct opa_smp *)recv->mad); 2078 else 2079 *resp_len = sizeof(struct ib_mad_hdr); 2080 } 2081 2082 return true; 2083 } else { 2084 return false; 2085 } 2086 } 2087 2088 static enum smi_action 2089 handle_opa_smi(struct ib_mad_port_private *port_priv, 2090 struct ib_mad_qp_info *qp_info, 2091 struct ib_wc *wc, 2092 int port_num, 2093 struct ib_mad_private *recv, 2094 struct ib_mad_private *response) 2095 { 2096 enum smi_forward_action retsmi; 2097 struct opa_smp *smp = (struct opa_smp *)recv->mad; 2098 2099 if (opa_smi_handle_dr_smp_recv(smp, 2100 rdma_cap_ib_switch(port_priv->device), 2101 port_num, 2102 port_priv->device->phys_port_cnt) == 2103 IB_SMI_DISCARD) 2104 return IB_SMI_DISCARD; 2105 2106 retsmi = opa_smi_check_forward_dr_smp(smp); 2107 if (retsmi == IB_SMI_LOCAL) 2108 return IB_SMI_HANDLE; 2109 2110 if (retsmi == IB_SMI_SEND) { /* don't forward */ 2111 if (opa_smi_handle_dr_smp_send(smp, 2112 rdma_cap_ib_switch(port_priv->device), 2113 port_num) == IB_SMI_DISCARD) 2114 return IB_SMI_DISCARD; 2115 2116 if (opa_smi_check_local_smp(smp, port_priv->device) == 2117 IB_SMI_DISCARD) 2118 return IB_SMI_DISCARD; 2119 2120 } else if (rdma_cap_ib_switch(port_priv->device)) { 2121 /* forward case for switches */ 2122 memcpy(response, recv, mad_priv_size(response)); 2123 response->header.recv_wc.wc = &response->header.wc; 2124 response->header.recv_wc.recv_buf.opa_mad = 2125 (struct opa_mad *)response->mad; 2126 response->header.recv_wc.recv_buf.grh = &response->grh; 2127 2128 agent_send_response((const struct ib_mad_hdr *)response->mad, 2129 &response->grh, wc, 2130 port_priv->device, 2131 opa_smi_get_fwd_port(smp), 2132 qp_info->qp->qp_num, 2133 recv->header.wc.byte_len, 2134 true); 2135 2136 return IB_SMI_DISCARD; 2137 } 2138 2139 return IB_SMI_HANDLE; 2140 } 2141 2142 static enum smi_action 2143 handle_smi(struct ib_mad_port_private *port_priv, 2144 struct ib_mad_qp_info *qp_info, 2145 struct ib_wc *wc, 2146 int port_num, 2147 struct ib_mad_private *recv, 2148 struct ib_mad_private *response, 2149 bool opa) 2150 { 2151 struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad; 2152 2153 if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION && 2154 mad_hdr->class_version == OPA_SM_CLASS_VERSION) 2155 return handle_opa_smi(port_priv, qp_info, wc, port_num, recv, 2156 response); 2157 2158 return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response); 2159 } 2160 2161 static void ib_mad_recv_done(struct ib_cq *cq, struct ib_wc *wc) 2162 { 2163 struct ib_mad_port_private *port_priv = cq->cq_context; 2164 struct ib_mad_list_head *mad_list = 2165 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe); 2166 struct ib_mad_qp_info *qp_info; 2167 struct ib_mad_private_header *mad_priv_hdr; 2168 struct ib_mad_private *recv, *response = NULL; 2169 struct ib_mad_agent_private *mad_agent; 2170 int port_num; 2171 int ret = IB_MAD_RESULT_SUCCESS; 2172 size_t mad_size; 2173 u16 resp_mad_pkey_index = 0; 2174 bool opa; 2175 2176 if (list_empty_careful(&port_priv->port_list)) 2177 return; 2178 2179 if (wc->status != IB_WC_SUCCESS) { 2180 /* 2181 * Receive errors indicate that the QP has entered the error 2182 * state - error handling/shutdown code will cleanup 2183 */ 2184 return; 2185 } 2186 2187 qp_info = mad_list->mad_queue->qp_info; 2188 dequeue_mad(mad_list); 2189 2190 opa = rdma_cap_opa_mad(qp_info->port_priv->device, 2191 qp_info->port_priv->port_num); 2192 2193 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header, 2194 mad_list); 2195 recv = container_of(mad_priv_hdr, struct ib_mad_private, header); 2196 ib_dma_unmap_single(port_priv->device, 2197 recv->header.mapping, 2198 mad_priv_dma_size(recv), 2199 DMA_FROM_DEVICE); 2200 2201 /* Setup MAD receive work completion from "normal" work completion */ 2202 recv->header.wc = *wc; 2203 recv->header.recv_wc.wc = &recv->header.wc; 2204 2205 if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) { 2206 recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh); 2207 recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad); 2208 } else { 2209 recv->header.recv_wc.mad_len = sizeof(struct ib_mad); 2210 recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad); 2211 } 2212 2213 recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad; 2214 recv->header.recv_wc.recv_buf.grh = &recv->grh; 2215 2216 if (atomic_read(&qp_info->snoop_count)) 2217 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS); 2218 2219 /* Validate MAD */ 2220 if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa)) 2221 goto out; 2222 2223 mad_size = recv->mad_size; 2224 response = alloc_mad_private(mad_size, GFP_KERNEL); 2225 if (!response) 2226 goto out; 2227 2228 if (rdma_cap_ib_switch(port_priv->device)) 2229 port_num = wc->port_num; 2230 else 2231 port_num = port_priv->port_num; 2232 2233 if (((struct ib_mad_hdr *)recv->mad)->mgmt_class == 2234 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 2235 if (handle_smi(port_priv, qp_info, wc, port_num, recv, 2236 response, opa) 2237 == IB_SMI_DISCARD) 2238 goto out; 2239 } 2240 2241 /* Give driver "right of first refusal" on incoming MAD */ 2242 if (port_priv->device->process_mad) { 2243 ret = port_priv->device->process_mad(port_priv->device, 0, 2244 port_priv->port_num, 2245 wc, &recv->grh, 2246 (const struct ib_mad_hdr *)recv->mad, 2247 recv->mad_size, 2248 (struct ib_mad_hdr *)response->mad, 2249 &mad_size, &resp_mad_pkey_index); 2250 2251 if (opa) 2252 wc->pkey_index = resp_mad_pkey_index; 2253 2254 if (ret & IB_MAD_RESULT_SUCCESS) { 2255 if (ret & IB_MAD_RESULT_CONSUMED) 2256 goto out; 2257 if (ret & IB_MAD_RESULT_REPLY) { 2258 agent_send_response((const struct ib_mad_hdr *)response->mad, 2259 &recv->grh, wc, 2260 port_priv->device, 2261 port_num, 2262 qp_info->qp->qp_num, 2263 mad_size, opa); 2264 goto out; 2265 } 2266 } 2267 } 2268 2269 mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad); 2270 if (mad_agent) { 2271 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc); 2272 /* 2273 * recv is freed up in error cases in ib_mad_complete_recv 2274 * or via recv_handler in ib_mad_complete_recv() 2275 */ 2276 recv = NULL; 2277 } else if ((ret & IB_MAD_RESULT_SUCCESS) && 2278 generate_unmatched_resp(recv, response, &mad_size, opa)) { 2279 agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc, 2280 port_priv->device, port_num, 2281 qp_info->qp->qp_num, mad_size, opa); 2282 } 2283 2284 out: 2285 /* Post another receive request for this QP */ 2286 if (response) { 2287 ib_mad_post_receive_mads(qp_info, response); 2288 kfree(recv); 2289 } else 2290 ib_mad_post_receive_mads(qp_info, recv); 2291 } 2292 2293 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv) 2294 { 2295 struct ib_mad_send_wr_private *mad_send_wr; 2296 unsigned long delay; 2297 2298 if (list_empty(&mad_agent_priv->wait_list)) { 2299 cancel_delayed_work(&mad_agent_priv->timed_work); 2300 } else { 2301 mad_send_wr = list_entry(mad_agent_priv->wait_list.next, 2302 struct ib_mad_send_wr_private, 2303 agent_list); 2304 2305 if (time_after(mad_agent_priv->timeout, 2306 mad_send_wr->timeout)) { 2307 mad_agent_priv->timeout = mad_send_wr->timeout; 2308 delay = mad_send_wr->timeout - jiffies; 2309 if ((long)delay <= 0) 2310 delay = 1; 2311 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq, 2312 &mad_agent_priv->timed_work, delay); 2313 } 2314 } 2315 } 2316 2317 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr) 2318 { 2319 struct ib_mad_agent_private *mad_agent_priv; 2320 struct ib_mad_send_wr_private *temp_mad_send_wr; 2321 struct list_head *list_item; 2322 unsigned long delay; 2323 2324 mad_agent_priv = mad_send_wr->mad_agent_priv; 2325 list_del(&mad_send_wr->agent_list); 2326 2327 delay = mad_send_wr->timeout; 2328 mad_send_wr->timeout += jiffies; 2329 2330 if (delay) { 2331 list_for_each_prev(list_item, &mad_agent_priv->wait_list) { 2332 temp_mad_send_wr = list_entry(list_item, 2333 struct ib_mad_send_wr_private, 2334 agent_list); 2335 if (time_after(mad_send_wr->timeout, 2336 temp_mad_send_wr->timeout)) 2337 break; 2338 } 2339 } 2340 else 2341 list_item = &mad_agent_priv->wait_list; 2342 list_add(&mad_send_wr->agent_list, list_item); 2343 2344 /* Reschedule a work item if we have a shorter timeout */ 2345 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) 2346 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq, 2347 &mad_agent_priv->timed_work, delay); 2348 } 2349 2350 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr, 2351 int timeout_ms) 2352 { 2353 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2354 wait_for_response(mad_send_wr); 2355 } 2356 2357 /* 2358 * Process a send work completion 2359 */ 2360 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr, 2361 struct ib_mad_send_wc *mad_send_wc) 2362 { 2363 struct ib_mad_agent_private *mad_agent_priv; 2364 unsigned long flags; 2365 int ret; 2366 2367 mad_agent_priv = mad_send_wr->mad_agent_priv; 2368 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2369 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) { 2370 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc); 2371 if (ret == IB_RMPP_RESULT_CONSUMED) 2372 goto done; 2373 } else 2374 ret = IB_RMPP_RESULT_UNHANDLED; 2375 2376 if (mad_send_wc->status != IB_WC_SUCCESS && 2377 mad_send_wr->status == IB_WC_SUCCESS) { 2378 mad_send_wr->status = mad_send_wc->status; 2379 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2380 } 2381 2382 if (--mad_send_wr->refcount > 0) { 2383 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout && 2384 mad_send_wr->status == IB_WC_SUCCESS) { 2385 wait_for_response(mad_send_wr); 2386 } 2387 goto done; 2388 } 2389 2390 /* Remove send from MAD agent and notify client of completion */ 2391 list_del(&mad_send_wr->agent_list); 2392 adjust_timeout(mad_agent_priv); 2393 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2394 2395 if (mad_send_wr->status != IB_WC_SUCCESS ) 2396 mad_send_wc->status = mad_send_wr->status; 2397 if (ret == IB_RMPP_RESULT_INTERNAL) 2398 ib_rmpp_send_handler(mad_send_wc); 2399 else 2400 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2401 mad_send_wc); 2402 2403 /* Release reference on agent taken when sending */ 2404 deref_mad_agent(mad_agent_priv); 2405 return; 2406 done: 2407 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2408 } 2409 2410 static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc) 2411 { 2412 struct ib_mad_port_private *port_priv = cq->cq_context; 2413 struct ib_mad_list_head *mad_list = 2414 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe); 2415 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr; 2416 struct ib_mad_qp_info *qp_info; 2417 struct ib_mad_queue *send_queue; 2418 struct ib_send_wr *bad_send_wr; 2419 struct ib_mad_send_wc mad_send_wc; 2420 unsigned long flags; 2421 int ret; 2422 2423 if (list_empty_careful(&port_priv->port_list)) 2424 return; 2425 2426 if (wc->status != IB_WC_SUCCESS) { 2427 if (!ib_mad_send_error(port_priv, wc)) 2428 return; 2429 } 2430 2431 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2432 mad_list); 2433 send_queue = mad_list->mad_queue; 2434 qp_info = send_queue->qp_info; 2435 2436 retry: 2437 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2438 mad_send_wr->header_mapping, 2439 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE); 2440 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2441 mad_send_wr->payload_mapping, 2442 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE); 2443 queued_send_wr = NULL; 2444 spin_lock_irqsave(&send_queue->lock, flags); 2445 list_del(&mad_list->list); 2446 2447 /* Move queued send to the send queue */ 2448 if (send_queue->count-- > send_queue->max_active) { 2449 mad_list = container_of(qp_info->overflow_list.next, 2450 struct ib_mad_list_head, list); 2451 queued_send_wr = container_of(mad_list, 2452 struct ib_mad_send_wr_private, 2453 mad_list); 2454 list_move_tail(&mad_list->list, &send_queue->list); 2455 } 2456 spin_unlock_irqrestore(&send_queue->lock, flags); 2457 2458 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2459 mad_send_wc.status = wc->status; 2460 mad_send_wc.vendor_err = wc->vendor_err; 2461 if (atomic_read(&qp_info->snoop_count)) 2462 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc, 2463 IB_MAD_SNOOP_SEND_COMPLETIONS); 2464 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 2465 2466 if (queued_send_wr) { 2467 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr.wr, 2468 &bad_send_wr); 2469 if (ret) { 2470 dev_err(&port_priv->device->dev, 2471 "ib_post_send failed: %d\n", ret); 2472 mad_send_wr = queued_send_wr; 2473 wc->status = IB_WC_LOC_QP_OP_ERR; 2474 goto retry; 2475 } 2476 } 2477 } 2478 2479 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info) 2480 { 2481 struct ib_mad_send_wr_private *mad_send_wr; 2482 struct ib_mad_list_head *mad_list; 2483 unsigned long flags; 2484 2485 spin_lock_irqsave(&qp_info->send_queue.lock, flags); 2486 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) { 2487 mad_send_wr = container_of(mad_list, 2488 struct ib_mad_send_wr_private, 2489 mad_list); 2490 mad_send_wr->retry = 1; 2491 } 2492 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); 2493 } 2494 2495 static bool ib_mad_send_error(struct ib_mad_port_private *port_priv, 2496 struct ib_wc *wc) 2497 { 2498 struct ib_mad_list_head *mad_list = 2499 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe); 2500 struct ib_mad_qp_info *qp_info = mad_list->mad_queue->qp_info; 2501 struct ib_mad_send_wr_private *mad_send_wr; 2502 int ret; 2503 2504 /* 2505 * Send errors will transition the QP to SQE - move 2506 * QP to RTS and repost flushed work requests 2507 */ 2508 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2509 mad_list); 2510 if (wc->status == IB_WC_WR_FLUSH_ERR) { 2511 if (mad_send_wr->retry) { 2512 /* Repost send */ 2513 struct ib_send_wr *bad_send_wr; 2514 2515 mad_send_wr->retry = 0; 2516 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr, 2517 &bad_send_wr); 2518 if (!ret) 2519 return false; 2520 } 2521 } else { 2522 struct ib_qp_attr *attr; 2523 2524 /* Transition QP to RTS and fail offending send */ 2525 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2526 if (attr) { 2527 attr->qp_state = IB_QPS_RTS; 2528 attr->cur_qp_state = IB_QPS_SQE; 2529 ret = ib_modify_qp(qp_info->qp, attr, 2530 IB_QP_STATE | IB_QP_CUR_STATE); 2531 kfree(attr); 2532 if (ret) 2533 dev_err(&port_priv->device->dev, 2534 "%s - ib_modify_qp to RTS: %d\n", 2535 __func__, ret); 2536 else 2537 mark_sends_for_retry(qp_info); 2538 } 2539 } 2540 2541 return true; 2542 } 2543 2544 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv) 2545 { 2546 unsigned long flags; 2547 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr; 2548 struct ib_mad_send_wc mad_send_wc; 2549 struct list_head cancel_list; 2550 2551 INIT_LIST_HEAD(&cancel_list); 2552 2553 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2554 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2555 &mad_agent_priv->send_list, agent_list) { 2556 if (mad_send_wr->status == IB_WC_SUCCESS) { 2557 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2558 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2559 } 2560 } 2561 2562 /* Empty wait list to prevent receives from finding a request */ 2563 list_splice_init(&mad_agent_priv->wait_list, &cancel_list); 2564 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2565 2566 /* Report all cancelled requests */ 2567 mad_send_wc.status = IB_WC_WR_FLUSH_ERR; 2568 mad_send_wc.vendor_err = 0; 2569 2570 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2571 &cancel_list, agent_list) { 2572 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2573 list_del(&mad_send_wr->agent_list); 2574 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2575 &mad_send_wc); 2576 atomic_dec(&mad_agent_priv->refcount); 2577 } 2578 } 2579 2580 static struct ib_mad_send_wr_private* 2581 find_send_wr(struct ib_mad_agent_private *mad_agent_priv, 2582 struct ib_mad_send_buf *send_buf) 2583 { 2584 struct ib_mad_send_wr_private *mad_send_wr; 2585 2586 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list, 2587 agent_list) { 2588 if (&mad_send_wr->send_buf == send_buf) 2589 return mad_send_wr; 2590 } 2591 2592 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list, 2593 agent_list) { 2594 if (is_rmpp_data_mad(mad_agent_priv, 2595 mad_send_wr->send_buf.mad) && 2596 &mad_send_wr->send_buf == send_buf) 2597 return mad_send_wr; 2598 } 2599 return NULL; 2600 } 2601 2602 int ib_modify_mad(struct ib_mad_agent *mad_agent, 2603 struct ib_mad_send_buf *send_buf, u32 timeout_ms) 2604 { 2605 struct ib_mad_agent_private *mad_agent_priv; 2606 struct ib_mad_send_wr_private *mad_send_wr; 2607 unsigned long flags; 2608 int active; 2609 2610 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, 2611 agent); 2612 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2613 mad_send_wr = find_send_wr(mad_agent_priv, send_buf); 2614 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) { 2615 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2616 return -EINVAL; 2617 } 2618 2619 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1); 2620 if (!timeout_ms) { 2621 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2622 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2623 } 2624 2625 mad_send_wr->send_buf.timeout_ms = timeout_ms; 2626 if (active) 2627 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2628 else 2629 ib_reset_mad_timeout(mad_send_wr, timeout_ms); 2630 2631 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2632 return 0; 2633 } 2634 EXPORT_SYMBOL(ib_modify_mad); 2635 2636 void ib_cancel_mad(struct ib_mad_agent *mad_agent, 2637 struct ib_mad_send_buf *send_buf) 2638 { 2639 ib_modify_mad(mad_agent, send_buf, 0); 2640 } 2641 EXPORT_SYMBOL(ib_cancel_mad); 2642 2643 static void local_completions(struct work_struct *work) 2644 { 2645 struct ib_mad_agent_private *mad_agent_priv; 2646 struct ib_mad_local_private *local; 2647 struct ib_mad_agent_private *recv_mad_agent; 2648 unsigned long flags; 2649 int free_mad; 2650 struct ib_wc wc; 2651 struct ib_mad_send_wc mad_send_wc; 2652 bool opa; 2653 2654 mad_agent_priv = 2655 container_of(work, struct ib_mad_agent_private, local_work); 2656 2657 opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device, 2658 mad_agent_priv->qp_info->port_priv->port_num); 2659 2660 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2661 while (!list_empty(&mad_agent_priv->local_list)) { 2662 local = list_entry(mad_agent_priv->local_list.next, 2663 struct ib_mad_local_private, 2664 completion_list); 2665 list_del(&local->completion_list); 2666 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2667 free_mad = 0; 2668 if (local->mad_priv) { 2669 u8 base_version; 2670 recv_mad_agent = local->recv_mad_agent; 2671 if (!recv_mad_agent) { 2672 dev_err(&mad_agent_priv->agent.device->dev, 2673 "No receive MAD agent for local completion\n"); 2674 free_mad = 1; 2675 goto local_send_completion; 2676 } 2677 2678 /* 2679 * Defined behavior is to complete response 2680 * before request 2681 */ 2682 build_smp_wc(recv_mad_agent->agent.qp, 2683 local->mad_send_wr->send_wr.wr.wr_cqe, 2684 be16_to_cpu(IB_LID_PERMISSIVE), 2685 local->mad_send_wr->send_wr.pkey_index, 2686 recv_mad_agent->agent.port_num, &wc); 2687 2688 local->mad_priv->header.recv_wc.wc = &wc; 2689 2690 base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version; 2691 if (opa && base_version == OPA_MGMT_BASE_VERSION) { 2692 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len; 2693 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad); 2694 } else { 2695 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad); 2696 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad); 2697 } 2698 2699 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list); 2700 list_add(&local->mad_priv->header.recv_wc.recv_buf.list, 2701 &local->mad_priv->header.recv_wc.rmpp_list); 2702 local->mad_priv->header.recv_wc.recv_buf.grh = NULL; 2703 local->mad_priv->header.recv_wc.recv_buf.mad = 2704 (struct ib_mad *)local->mad_priv->mad; 2705 if (atomic_read(&recv_mad_agent->qp_info->snoop_count)) 2706 snoop_recv(recv_mad_agent->qp_info, 2707 &local->mad_priv->header.recv_wc, 2708 IB_MAD_SNOOP_RECVS); 2709 recv_mad_agent->agent.recv_handler( 2710 &recv_mad_agent->agent, 2711 &local->mad_send_wr->send_buf, 2712 &local->mad_priv->header.recv_wc); 2713 spin_lock_irqsave(&recv_mad_agent->lock, flags); 2714 atomic_dec(&recv_mad_agent->refcount); 2715 spin_unlock_irqrestore(&recv_mad_agent->lock, flags); 2716 } 2717 2718 local_send_completion: 2719 /* Complete send */ 2720 mad_send_wc.status = IB_WC_SUCCESS; 2721 mad_send_wc.vendor_err = 0; 2722 mad_send_wc.send_buf = &local->mad_send_wr->send_buf; 2723 if (atomic_read(&mad_agent_priv->qp_info->snoop_count)) 2724 snoop_send(mad_agent_priv->qp_info, 2725 &local->mad_send_wr->send_buf, 2726 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS); 2727 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2728 &mad_send_wc); 2729 2730 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2731 atomic_dec(&mad_agent_priv->refcount); 2732 if (free_mad) 2733 kfree(local->mad_priv); 2734 kfree(local); 2735 } 2736 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2737 } 2738 2739 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr) 2740 { 2741 int ret; 2742 2743 if (!mad_send_wr->retries_left) 2744 return -ETIMEDOUT; 2745 2746 mad_send_wr->retries_left--; 2747 mad_send_wr->send_buf.retries++; 2748 2749 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms); 2750 2751 if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) { 2752 ret = ib_retry_rmpp(mad_send_wr); 2753 switch (ret) { 2754 case IB_RMPP_RESULT_UNHANDLED: 2755 ret = ib_send_mad(mad_send_wr); 2756 break; 2757 case IB_RMPP_RESULT_CONSUMED: 2758 ret = 0; 2759 break; 2760 default: 2761 ret = -ECOMM; 2762 break; 2763 } 2764 } else 2765 ret = ib_send_mad(mad_send_wr); 2766 2767 if (!ret) { 2768 mad_send_wr->refcount++; 2769 list_add_tail(&mad_send_wr->agent_list, 2770 &mad_send_wr->mad_agent_priv->send_list); 2771 } 2772 return ret; 2773 } 2774 2775 static void timeout_sends(struct work_struct *work) 2776 { 2777 struct ib_mad_agent_private *mad_agent_priv; 2778 struct ib_mad_send_wr_private *mad_send_wr; 2779 struct ib_mad_send_wc mad_send_wc; 2780 unsigned long flags, delay; 2781 2782 mad_agent_priv = container_of(work, struct ib_mad_agent_private, 2783 timed_work.work); 2784 mad_send_wc.vendor_err = 0; 2785 2786 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2787 while (!list_empty(&mad_agent_priv->wait_list)) { 2788 mad_send_wr = list_entry(mad_agent_priv->wait_list.next, 2789 struct ib_mad_send_wr_private, 2790 agent_list); 2791 2792 if (time_after(mad_send_wr->timeout, jiffies)) { 2793 delay = mad_send_wr->timeout - jiffies; 2794 if ((long)delay <= 0) 2795 delay = 1; 2796 queue_delayed_work(mad_agent_priv->qp_info-> 2797 port_priv->wq, 2798 &mad_agent_priv->timed_work, delay); 2799 break; 2800 } 2801 2802 list_del(&mad_send_wr->agent_list); 2803 if (mad_send_wr->status == IB_WC_SUCCESS && 2804 !retry_send(mad_send_wr)) 2805 continue; 2806 2807 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2808 2809 if (mad_send_wr->status == IB_WC_SUCCESS) 2810 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR; 2811 else 2812 mad_send_wc.status = mad_send_wr->status; 2813 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2814 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2815 &mad_send_wc); 2816 2817 atomic_dec(&mad_agent_priv->refcount); 2818 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2819 } 2820 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2821 } 2822 2823 /* 2824 * Allocate receive MADs and post receive WRs for them 2825 */ 2826 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info, 2827 struct ib_mad_private *mad) 2828 { 2829 unsigned long flags; 2830 int post, ret; 2831 struct ib_mad_private *mad_priv; 2832 struct ib_sge sg_list; 2833 struct ib_recv_wr recv_wr, *bad_recv_wr; 2834 struct ib_mad_queue *recv_queue = &qp_info->recv_queue; 2835 2836 /* Initialize common scatter list fields */ 2837 sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey; 2838 2839 /* Initialize common receive WR fields */ 2840 recv_wr.next = NULL; 2841 recv_wr.sg_list = &sg_list; 2842 recv_wr.num_sge = 1; 2843 2844 do { 2845 /* Allocate and map receive buffer */ 2846 if (mad) { 2847 mad_priv = mad; 2848 mad = NULL; 2849 } else { 2850 mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv), 2851 GFP_ATOMIC); 2852 if (!mad_priv) { 2853 ret = -ENOMEM; 2854 break; 2855 } 2856 } 2857 sg_list.length = mad_priv_dma_size(mad_priv); 2858 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device, 2859 &mad_priv->grh, 2860 mad_priv_dma_size(mad_priv), 2861 DMA_FROM_DEVICE); 2862 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device, 2863 sg_list.addr))) { 2864 ret = -ENOMEM; 2865 break; 2866 } 2867 mad_priv->header.mapping = sg_list.addr; 2868 mad_priv->header.mad_list.mad_queue = recv_queue; 2869 mad_priv->header.mad_list.cqe.done = ib_mad_recv_done; 2870 recv_wr.wr_cqe = &mad_priv->header.mad_list.cqe; 2871 2872 /* Post receive WR */ 2873 spin_lock_irqsave(&recv_queue->lock, flags); 2874 post = (++recv_queue->count < recv_queue->max_active); 2875 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list); 2876 spin_unlock_irqrestore(&recv_queue->lock, flags); 2877 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr); 2878 if (ret) { 2879 spin_lock_irqsave(&recv_queue->lock, flags); 2880 list_del(&mad_priv->header.mad_list.list); 2881 recv_queue->count--; 2882 spin_unlock_irqrestore(&recv_queue->lock, flags); 2883 ib_dma_unmap_single(qp_info->port_priv->device, 2884 mad_priv->header.mapping, 2885 mad_priv_dma_size(mad_priv), 2886 DMA_FROM_DEVICE); 2887 kfree(mad_priv); 2888 dev_err(&qp_info->port_priv->device->dev, 2889 "ib_post_recv failed: %d\n", ret); 2890 break; 2891 } 2892 } while (post); 2893 2894 return ret; 2895 } 2896 2897 /* 2898 * Return all the posted receive MADs 2899 */ 2900 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info) 2901 { 2902 struct ib_mad_private_header *mad_priv_hdr; 2903 struct ib_mad_private *recv; 2904 struct ib_mad_list_head *mad_list; 2905 2906 if (!qp_info->qp) 2907 return; 2908 2909 while (!list_empty(&qp_info->recv_queue.list)) { 2910 2911 mad_list = list_entry(qp_info->recv_queue.list.next, 2912 struct ib_mad_list_head, list); 2913 mad_priv_hdr = container_of(mad_list, 2914 struct ib_mad_private_header, 2915 mad_list); 2916 recv = container_of(mad_priv_hdr, struct ib_mad_private, 2917 header); 2918 2919 /* Remove from posted receive MAD list */ 2920 list_del(&mad_list->list); 2921 2922 ib_dma_unmap_single(qp_info->port_priv->device, 2923 recv->header.mapping, 2924 mad_priv_dma_size(recv), 2925 DMA_FROM_DEVICE); 2926 kfree(recv); 2927 } 2928 2929 qp_info->recv_queue.count = 0; 2930 } 2931 2932 /* 2933 * Start the port 2934 */ 2935 static int ib_mad_port_start(struct ib_mad_port_private *port_priv) 2936 { 2937 int ret, i; 2938 struct ib_qp_attr *attr; 2939 struct ib_qp *qp; 2940 u16 pkey_index; 2941 2942 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2943 if (!attr) 2944 return -ENOMEM; 2945 2946 ret = ib_find_pkey(port_priv->device, port_priv->port_num, 2947 IB_DEFAULT_PKEY_FULL, &pkey_index); 2948 if (ret) 2949 pkey_index = 0; 2950 2951 for (i = 0; i < IB_MAD_QPS_CORE; i++) { 2952 qp = port_priv->qp_info[i].qp; 2953 if (!qp) 2954 continue; 2955 2956 /* 2957 * PKey index for QP1 is irrelevant but 2958 * one is needed for the Reset to Init transition 2959 */ 2960 attr->qp_state = IB_QPS_INIT; 2961 attr->pkey_index = pkey_index; 2962 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY; 2963 ret = ib_modify_qp(qp, attr, IB_QP_STATE | 2964 IB_QP_PKEY_INDEX | IB_QP_QKEY); 2965 if (ret) { 2966 dev_err(&port_priv->device->dev, 2967 "Couldn't change QP%d state to INIT: %d\n", 2968 i, ret); 2969 goto out; 2970 } 2971 2972 attr->qp_state = IB_QPS_RTR; 2973 ret = ib_modify_qp(qp, attr, IB_QP_STATE); 2974 if (ret) { 2975 dev_err(&port_priv->device->dev, 2976 "Couldn't change QP%d state to RTR: %d\n", 2977 i, ret); 2978 goto out; 2979 } 2980 2981 attr->qp_state = IB_QPS_RTS; 2982 attr->sq_psn = IB_MAD_SEND_Q_PSN; 2983 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN); 2984 if (ret) { 2985 dev_err(&port_priv->device->dev, 2986 "Couldn't change QP%d state to RTS: %d\n", 2987 i, ret); 2988 goto out; 2989 } 2990 } 2991 2992 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); 2993 if (ret) { 2994 dev_err(&port_priv->device->dev, 2995 "Failed to request completion notification: %d\n", 2996 ret); 2997 goto out; 2998 } 2999 3000 for (i = 0; i < IB_MAD_QPS_CORE; i++) { 3001 if (!port_priv->qp_info[i].qp) 3002 continue; 3003 3004 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL); 3005 if (ret) { 3006 dev_err(&port_priv->device->dev, 3007 "Couldn't post receive WRs\n"); 3008 goto out; 3009 } 3010 } 3011 out: 3012 kfree(attr); 3013 return ret; 3014 } 3015 3016 static void qp_event_handler(struct ib_event *event, void *qp_context) 3017 { 3018 struct ib_mad_qp_info *qp_info = qp_context; 3019 3020 /* It's worse than that! He's dead, Jim! */ 3021 dev_err(&qp_info->port_priv->device->dev, 3022 "Fatal error (%d) on MAD QP (%d)\n", 3023 event->event, qp_info->qp->qp_num); 3024 } 3025 3026 static void init_mad_queue(struct ib_mad_qp_info *qp_info, 3027 struct ib_mad_queue *mad_queue) 3028 { 3029 mad_queue->qp_info = qp_info; 3030 mad_queue->count = 0; 3031 spin_lock_init(&mad_queue->lock); 3032 INIT_LIST_HEAD(&mad_queue->list); 3033 } 3034 3035 static void init_mad_qp(struct ib_mad_port_private *port_priv, 3036 struct ib_mad_qp_info *qp_info) 3037 { 3038 qp_info->port_priv = port_priv; 3039 init_mad_queue(qp_info, &qp_info->send_queue); 3040 init_mad_queue(qp_info, &qp_info->recv_queue); 3041 INIT_LIST_HEAD(&qp_info->overflow_list); 3042 spin_lock_init(&qp_info->snoop_lock); 3043 qp_info->snoop_table = NULL; 3044 qp_info->snoop_table_size = 0; 3045 atomic_set(&qp_info->snoop_count, 0); 3046 } 3047 3048 static int create_mad_qp(struct ib_mad_qp_info *qp_info, 3049 enum ib_qp_type qp_type) 3050 { 3051 struct ib_qp_init_attr qp_init_attr; 3052 int ret; 3053 3054 memset(&qp_init_attr, 0, sizeof qp_init_attr); 3055 qp_init_attr.send_cq = qp_info->port_priv->cq; 3056 qp_init_attr.recv_cq = qp_info->port_priv->cq; 3057 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR; 3058 qp_init_attr.cap.max_send_wr = mad_sendq_size; 3059 qp_init_attr.cap.max_recv_wr = mad_recvq_size; 3060 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG; 3061 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG; 3062 qp_init_attr.qp_type = qp_type; 3063 qp_init_attr.port_num = qp_info->port_priv->port_num; 3064 qp_init_attr.qp_context = qp_info; 3065 qp_init_attr.event_handler = qp_event_handler; 3066 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr); 3067 if (IS_ERR(qp_info->qp)) { 3068 dev_err(&qp_info->port_priv->device->dev, 3069 "Couldn't create ib_mad QP%d\n", 3070 get_spl_qp_index(qp_type)); 3071 ret = PTR_ERR(qp_info->qp); 3072 goto error; 3073 } 3074 /* Use minimum queue sizes unless the CQ is resized */ 3075 qp_info->send_queue.max_active = mad_sendq_size; 3076 qp_info->recv_queue.max_active = mad_recvq_size; 3077 return 0; 3078 3079 error: 3080 return ret; 3081 } 3082 3083 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info) 3084 { 3085 if (!qp_info->qp) 3086 return; 3087 3088 ib_destroy_qp(qp_info->qp); 3089 kfree(qp_info->snoop_table); 3090 } 3091 3092 /* 3093 * Open the port 3094 * Create the QP, PD, MR, and CQ if needed 3095 */ 3096 static int ib_mad_port_open(struct ib_device *device, 3097 int port_num) 3098 { 3099 int ret, cq_size; 3100 struct ib_mad_port_private *port_priv; 3101 unsigned long flags; 3102 char name[sizeof "ib_mad123"]; 3103 int has_smi; 3104 3105 if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE)) 3106 return -EFAULT; 3107 3108 if (WARN_ON(rdma_cap_opa_mad(device, port_num) && 3109 rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE)) 3110 return -EFAULT; 3111 3112 /* Create new device info */ 3113 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL); 3114 if (!port_priv) 3115 return -ENOMEM; 3116 3117 port_priv->device = device; 3118 port_priv->port_num = port_num; 3119 spin_lock_init(&port_priv->reg_lock); 3120 INIT_LIST_HEAD(&port_priv->agent_list); 3121 init_mad_qp(port_priv, &port_priv->qp_info[0]); 3122 init_mad_qp(port_priv, &port_priv->qp_info[1]); 3123 3124 cq_size = mad_sendq_size + mad_recvq_size; 3125 has_smi = rdma_cap_ib_smi(device, port_num); 3126 if (has_smi) 3127 cq_size *= 2; 3128 3129 port_priv->cq = ib_alloc_cq(port_priv->device, port_priv, cq_size, 0, 3130 IB_POLL_WORKQUEUE); 3131 if (IS_ERR(port_priv->cq)) { 3132 dev_err(&device->dev, "Couldn't create ib_mad CQ\n"); 3133 ret = PTR_ERR(port_priv->cq); 3134 goto error3; 3135 } 3136 3137 port_priv->pd = ib_alloc_pd(device, 0); 3138 if (IS_ERR(port_priv->pd)) { 3139 dev_err(&device->dev, "Couldn't create ib_mad PD\n"); 3140 ret = PTR_ERR(port_priv->pd); 3141 goto error4; 3142 } 3143 3144 if (has_smi) { 3145 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI); 3146 if (ret) 3147 goto error6; 3148 } 3149 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI); 3150 if (ret) 3151 goto error7; 3152 3153 snprintf(name, sizeof name, "ib_mad%d", port_num); 3154 port_priv->wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM); 3155 if (!port_priv->wq) { 3156 ret = -ENOMEM; 3157 goto error8; 3158 } 3159 3160 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 3161 list_add_tail(&port_priv->port_list, &ib_mad_port_list); 3162 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 3163 3164 ret = ib_mad_port_start(port_priv); 3165 if (ret) { 3166 dev_err(&device->dev, "Couldn't start port\n"); 3167 goto error9; 3168 } 3169 3170 return 0; 3171 3172 error9: 3173 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 3174 list_del_init(&port_priv->port_list); 3175 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 3176 3177 destroy_workqueue(port_priv->wq); 3178 error8: 3179 destroy_mad_qp(&port_priv->qp_info[1]); 3180 error7: 3181 destroy_mad_qp(&port_priv->qp_info[0]); 3182 error6: 3183 ib_dealloc_pd(port_priv->pd); 3184 error4: 3185 ib_free_cq(port_priv->cq); 3186 cleanup_recv_queue(&port_priv->qp_info[1]); 3187 cleanup_recv_queue(&port_priv->qp_info[0]); 3188 error3: 3189 kfree(port_priv); 3190 3191 return ret; 3192 } 3193 3194 /* 3195 * Close the port 3196 * If there are no classes using the port, free the port 3197 * resources (CQ, MR, PD, QP) and remove the port's info structure 3198 */ 3199 static int ib_mad_port_close(struct ib_device *device, int port_num) 3200 { 3201 struct ib_mad_port_private *port_priv; 3202 unsigned long flags; 3203 3204 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 3205 port_priv = __ib_get_mad_port(device, port_num); 3206 if (port_priv == NULL) { 3207 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 3208 dev_err(&device->dev, "Port %d not found\n", port_num); 3209 return -ENODEV; 3210 } 3211 list_del_init(&port_priv->port_list); 3212 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 3213 3214 destroy_workqueue(port_priv->wq); 3215 destroy_mad_qp(&port_priv->qp_info[1]); 3216 destroy_mad_qp(&port_priv->qp_info[0]); 3217 ib_dealloc_pd(port_priv->pd); 3218 ib_free_cq(port_priv->cq); 3219 cleanup_recv_queue(&port_priv->qp_info[1]); 3220 cleanup_recv_queue(&port_priv->qp_info[0]); 3221 /* XXX: Handle deallocation of MAD registration tables */ 3222 3223 kfree(port_priv); 3224 3225 return 0; 3226 } 3227 3228 static void ib_mad_init_device(struct ib_device *device) 3229 { 3230 int start, i; 3231 3232 start = rdma_start_port(device); 3233 3234 for (i = start; i <= rdma_end_port(device); i++) { 3235 if (!rdma_cap_ib_mad(device, i)) 3236 continue; 3237 3238 if (ib_mad_port_open(device, i)) { 3239 dev_err(&device->dev, "Couldn't open port %d\n", i); 3240 goto error; 3241 } 3242 if (ib_agent_port_open(device, i)) { 3243 dev_err(&device->dev, 3244 "Couldn't open port %d for agents\n", i); 3245 goto error_agent; 3246 } 3247 } 3248 return; 3249 3250 error_agent: 3251 if (ib_mad_port_close(device, i)) 3252 dev_err(&device->dev, "Couldn't close port %d\n", i); 3253 3254 error: 3255 while (--i >= start) { 3256 if (!rdma_cap_ib_mad(device, i)) 3257 continue; 3258 3259 if (ib_agent_port_close(device, i)) 3260 dev_err(&device->dev, 3261 "Couldn't close port %d for agents\n", i); 3262 if (ib_mad_port_close(device, i)) 3263 dev_err(&device->dev, "Couldn't close port %d\n", i); 3264 } 3265 } 3266 3267 static void ib_mad_remove_device(struct ib_device *device, void *client_data) 3268 { 3269 int i; 3270 3271 for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) { 3272 if (!rdma_cap_ib_mad(device, i)) 3273 continue; 3274 3275 if (ib_agent_port_close(device, i)) 3276 dev_err(&device->dev, 3277 "Couldn't close port %d for agents\n", i); 3278 if (ib_mad_port_close(device, i)) 3279 dev_err(&device->dev, "Couldn't close port %d\n", i); 3280 } 3281 } 3282 3283 static struct ib_client mad_client = { 3284 .name = "mad", 3285 .add = ib_mad_init_device, 3286 .remove = ib_mad_remove_device 3287 }; 3288 3289 int ib_mad_init(void) 3290 { 3291 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE); 3292 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE); 3293 3294 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE); 3295 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE); 3296 3297 INIT_LIST_HEAD(&ib_mad_port_list); 3298 3299 if (ib_register_client(&mad_client)) { 3300 pr_err("Couldn't register ib_mad client\n"); 3301 return -EINVAL; 3302 } 3303 3304 return 0; 3305 } 3306 3307 void ib_mad_cleanup(void) 3308 { 3309 ib_unregister_client(&mad_client); 3310 } 3311