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) 2014,2018 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 <linux/security.h> 44 #include <linux/xarray.h> 45 #include <rdma/ib_cache.h> 46 47 #include "mad_priv.h" 48 #include "core_priv.h" 49 #include "mad_rmpp.h" 50 #include "smi.h" 51 #include "opa_smi.h" 52 #include "agent.h" 53 54 #define CREATE_TRACE_POINTS 55 #include <trace/events/ib_mad.h> 56 57 #ifdef CONFIG_TRACEPOINTS create_mad_addr_info(struct ib_mad_send_wr_private * mad_send_wr,struct ib_mad_qp_info * qp_info,struct trace_event_raw_ib_mad_send_template * entry)58 static void create_mad_addr_info(struct ib_mad_send_wr_private *mad_send_wr, 59 struct ib_mad_qp_info *qp_info, 60 struct trace_event_raw_ib_mad_send_template *entry) 61 { 62 struct ib_ud_wr *wr = &mad_send_wr->send_wr; 63 struct rdma_ah_attr attr = {}; 64 65 rdma_query_ah(wr->ah, &attr); 66 67 /* These are common */ 68 entry->sl = attr.sl; 69 entry->rqpn = wr->remote_qpn; 70 entry->rqkey = wr->remote_qkey; 71 entry->dlid = rdma_ah_get_dlid(&attr); 72 } 73 #endif 74 75 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE; 76 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE; 77 78 module_param_named(send_queue_size, mad_sendq_size, int, 0444); 79 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests"); 80 module_param_named(recv_queue_size, mad_recvq_size, int, 0444); 81 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests"); 82 83 static DEFINE_XARRAY_ALLOC1(ib_mad_clients); 84 static u32 ib_mad_client_next; 85 static struct list_head ib_mad_port_list; 86 87 /* Port list lock */ 88 static DEFINE_SPINLOCK(ib_mad_port_list_lock); 89 90 /* Forward declarations */ 91 static int method_in_use(struct ib_mad_mgmt_method_table **method, 92 struct ib_mad_reg_req *mad_reg_req); 93 static void remove_mad_reg_req(struct ib_mad_agent_private *priv); 94 static struct ib_mad_agent_private *find_mad_agent( 95 struct ib_mad_port_private *port_priv, 96 const struct ib_mad_hdr *mad); 97 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info, 98 struct ib_mad_private *mad); 99 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv); 100 static void timeout_sends(struct work_struct *work); 101 static void local_completions(struct work_struct *work); 102 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req, 103 struct ib_mad_agent_private *agent_priv, 104 u8 mgmt_class); 105 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req, 106 struct ib_mad_agent_private *agent_priv); 107 static bool ib_mad_send_error(struct ib_mad_port_private *port_priv, 108 struct ib_wc *wc); 109 static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc); 110 111 /* 112 * Returns a ib_mad_port_private structure or NULL for a device/port 113 * Assumes ib_mad_port_list_lock is being held 114 */ 115 static inline struct ib_mad_port_private * __ib_get_mad_port(struct ib_device * device,u32 port_num)116 __ib_get_mad_port(struct ib_device *device, u32 port_num) 117 { 118 struct ib_mad_port_private *entry; 119 120 list_for_each_entry(entry, &ib_mad_port_list, port_list) { 121 if (entry->device == device && entry->port_num == port_num) 122 return entry; 123 } 124 return NULL; 125 } 126 127 /* 128 * Wrapper function to return a ib_mad_port_private structure or NULL 129 * for a device/port 130 */ 131 static inline struct ib_mad_port_private * ib_get_mad_port(struct ib_device * device,u32 port_num)132 ib_get_mad_port(struct ib_device *device, u32 port_num) 133 { 134 struct ib_mad_port_private *entry; 135 unsigned long flags; 136 137 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 138 entry = __ib_get_mad_port(device, port_num); 139 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 140 141 return entry; 142 } 143 convert_mgmt_class(u8 mgmt_class)144 static inline u8 convert_mgmt_class(u8 mgmt_class) 145 { 146 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */ 147 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ? 148 0 : mgmt_class; 149 } 150 get_spl_qp_index(enum ib_qp_type qp_type)151 static int get_spl_qp_index(enum ib_qp_type qp_type) 152 { 153 switch (qp_type) { 154 case IB_QPT_SMI: 155 return 0; 156 case IB_QPT_GSI: 157 return 1; 158 default: 159 return -1; 160 } 161 } 162 vendor_class_index(u8 mgmt_class)163 static int vendor_class_index(u8 mgmt_class) 164 { 165 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START; 166 } 167 is_vendor_class(u8 mgmt_class)168 static int is_vendor_class(u8 mgmt_class) 169 { 170 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) || 171 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END)) 172 return 0; 173 return 1; 174 } 175 is_vendor_oui(char * oui)176 static int is_vendor_oui(char *oui) 177 { 178 if (oui[0] || oui[1] || oui[2]) 179 return 1; 180 return 0; 181 } 182 is_vendor_method_in_use(struct ib_mad_mgmt_vendor_class * vendor_class,struct ib_mad_reg_req * mad_reg_req)183 static int is_vendor_method_in_use( 184 struct ib_mad_mgmt_vendor_class *vendor_class, 185 struct ib_mad_reg_req *mad_reg_req) 186 { 187 struct ib_mad_mgmt_method_table *method; 188 int i; 189 190 for (i = 0; i < MAX_MGMT_OUI; i++) { 191 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) { 192 method = vendor_class->method_table[i]; 193 if (method) { 194 if (method_in_use(&method, mad_reg_req)) 195 return 1; 196 else 197 break; 198 } 199 } 200 } 201 return 0; 202 } 203 ib_response_mad(const struct ib_mad_hdr * hdr)204 int ib_response_mad(const struct ib_mad_hdr *hdr) 205 { 206 return ((hdr->method & IB_MGMT_METHOD_RESP) || 207 (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) || 208 ((hdr->mgmt_class == IB_MGMT_CLASS_BM) && 209 (hdr->attr_mod & IB_BM_ATTR_MOD_RESP))); 210 } 211 EXPORT_SYMBOL(ib_response_mad); 212 213 /* 214 * ib_register_mad_agent - Register to send/receive MADs 215 * 216 * Context: Process context. 217 */ ib_register_mad_agent(struct ib_device * device,u32 port_num,enum ib_qp_type qp_type,struct ib_mad_reg_req * mad_reg_req,u8 rmpp_version,ib_mad_send_handler send_handler,ib_mad_recv_handler recv_handler,void * context,u32 registration_flags)218 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device, 219 u32 port_num, 220 enum ib_qp_type qp_type, 221 struct ib_mad_reg_req *mad_reg_req, 222 u8 rmpp_version, 223 ib_mad_send_handler send_handler, 224 ib_mad_recv_handler recv_handler, 225 void *context, 226 u32 registration_flags) 227 { 228 struct ib_mad_port_private *port_priv; 229 struct ib_mad_agent *ret = ERR_PTR(-EINVAL); 230 struct ib_mad_agent_private *mad_agent_priv; 231 struct ib_mad_reg_req *reg_req = NULL; 232 struct ib_mad_mgmt_class_table *class; 233 struct ib_mad_mgmt_vendor_class_table *vendor; 234 struct ib_mad_mgmt_vendor_class *vendor_class; 235 struct ib_mad_mgmt_method_table *method; 236 int ret2, qpn; 237 u8 mgmt_class, vclass; 238 239 if ((qp_type == IB_QPT_SMI && !rdma_cap_ib_smi(device, port_num)) || 240 (qp_type == IB_QPT_GSI && !rdma_cap_ib_cm(device, port_num))) 241 return ERR_PTR(-EPROTONOSUPPORT); 242 243 /* Validate parameters */ 244 qpn = get_spl_qp_index(qp_type); 245 if (qpn == -1) { 246 dev_dbg_ratelimited(&device->dev, "%s: invalid QP Type %d\n", 247 __func__, qp_type); 248 goto error1; 249 } 250 251 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) { 252 dev_dbg_ratelimited(&device->dev, 253 "%s: invalid RMPP Version %u\n", 254 __func__, rmpp_version); 255 goto error1; 256 } 257 258 /* Validate MAD registration request if supplied */ 259 if (mad_reg_req) { 260 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) { 261 dev_dbg_ratelimited(&device->dev, 262 "%s: invalid Class Version %u\n", 263 __func__, 264 mad_reg_req->mgmt_class_version); 265 goto error1; 266 } 267 if (!recv_handler) { 268 dev_dbg_ratelimited(&device->dev, 269 "%s: no recv_handler\n", __func__); 270 goto error1; 271 } 272 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) { 273 /* 274 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only 275 * one in this range currently allowed 276 */ 277 if (mad_reg_req->mgmt_class != 278 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 279 dev_dbg_ratelimited(&device->dev, 280 "%s: Invalid Mgmt Class 0x%x\n", 281 __func__, mad_reg_req->mgmt_class); 282 goto error1; 283 } 284 } else if (mad_reg_req->mgmt_class == 0) { 285 /* 286 * Class 0 is reserved in IBA and is used for 287 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE 288 */ 289 dev_dbg_ratelimited(&device->dev, 290 "%s: Invalid Mgmt Class 0\n", 291 __func__); 292 goto error1; 293 } else if (is_vendor_class(mad_reg_req->mgmt_class)) { 294 /* 295 * If class is in "new" vendor range, 296 * ensure supplied OUI is not zero 297 */ 298 if (!is_vendor_oui(mad_reg_req->oui)) { 299 dev_dbg_ratelimited(&device->dev, 300 "%s: No OUI specified for class 0x%x\n", 301 __func__, 302 mad_reg_req->mgmt_class); 303 goto error1; 304 } 305 } 306 /* Make sure class supplied is consistent with RMPP */ 307 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) { 308 if (rmpp_version) { 309 dev_dbg_ratelimited(&device->dev, 310 "%s: RMPP version for non-RMPP class 0x%x\n", 311 __func__, mad_reg_req->mgmt_class); 312 goto error1; 313 } 314 } 315 316 /* Make sure class supplied is consistent with QP type */ 317 if (qp_type == IB_QPT_SMI) { 318 if ((mad_reg_req->mgmt_class != 319 IB_MGMT_CLASS_SUBN_LID_ROUTED) && 320 (mad_reg_req->mgmt_class != 321 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) { 322 dev_dbg_ratelimited(&device->dev, 323 "%s: Invalid SM QP type: class 0x%x\n", 324 __func__, mad_reg_req->mgmt_class); 325 goto error1; 326 } 327 } else { 328 if ((mad_reg_req->mgmt_class == 329 IB_MGMT_CLASS_SUBN_LID_ROUTED) || 330 (mad_reg_req->mgmt_class == 331 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) { 332 dev_dbg_ratelimited(&device->dev, 333 "%s: Invalid GS QP type: class 0x%x\n", 334 __func__, mad_reg_req->mgmt_class); 335 goto error1; 336 } 337 } 338 } else { 339 /* No registration request supplied */ 340 if (!send_handler) 341 goto error1; 342 if (registration_flags & IB_MAD_USER_RMPP) 343 goto error1; 344 } 345 346 /* Validate device and port */ 347 port_priv = ib_get_mad_port(device, port_num); 348 if (!port_priv) { 349 dev_dbg_ratelimited(&device->dev, "%s: Invalid port %u\n", 350 __func__, port_num); 351 ret = ERR_PTR(-ENODEV); 352 goto error1; 353 } 354 355 /* Verify the QP requested is supported. For example, Ethernet devices 356 * will not have QP0. 357 */ 358 if (!port_priv->qp_info[qpn].qp) { 359 dev_dbg_ratelimited(&device->dev, "%s: QP %d not supported\n", 360 __func__, qpn); 361 ret = ERR_PTR(-EPROTONOSUPPORT); 362 goto error1; 363 } 364 365 /* Allocate structures */ 366 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL); 367 if (!mad_agent_priv) { 368 ret = ERR_PTR(-ENOMEM); 369 goto error1; 370 } 371 372 if (mad_reg_req) { 373 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL); 374 if (!reg_req) { 375 ret = ERR_PTR(-ENOMEM); 376 goto error3; 377 } 378 } 379 380 /* Now, fill in the various structures */ 381 mad_agent_priv->qp_info = &port_priv->qp_info[qpn]; 382 mad_agent_priv->reg_req = reg_req; 383 mad_agent_priv->agent.rmpp_version = rmpp_version; 384 mad_agent_priv->agent.device = device; 385 mad_agent_priv->agent.recv_handler = recv_handler; 386 mad_agent_priv->agent.send_handler = send_handler; 387 mad_agent_priv->agent.context = context; 388 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp; 389 mad_agent_priv->agent.port_num = port_num; 390 mad_agent_priv->agent.flags = registration_flags; 391 spin_lock_init(&mad_agent_priv->lock); 392 INIT_LIST_HEAD(&mad_agent_priv->send_list); 393 INIT_LIST_HEAD(&mad_agent_priv->wait_list); 394 INIT_LIST_HEAD(&mad_agent_priv->done_list); 395 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list); 396 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends); 397 INIT_LIST_HEAD(&mad_agent_priv->local_list); 398 INIT_WORK(&mad_agent_priv->local_work, local_completions); 399 refcount_set(&mad_agent_priv->refcount, 1); 400 init_completion(&mad_agent_priv->comp); 401 402 ret2 = ib_mad_agent_security_setup(&mad_agent_priv->agent, qp_type); 403 if (ret2) { 404 ret = ERR_PTR(ret2); 405 goto error4; 406 } 407 408 /* 409 * The mlx4 driver uses the top byte to distinguish which virtual 410 * function generated the MAD, so we must avoid using it. 411 */ 412 ret2 = xa_alloc_cyclic(&ib_mad_clients, &mad_agent_priv->agent.hi_tid, 413 mad_agent_priv, XA_LIMIT(0, (1 << 24) - 1), 414 &ib_mad_client_next, GFP_KERNEL); 415 if (ret2 < 0) { 416 ret = ERR_PTR(ret2); 417 goto error5; 418 } 419 420 /* 421 * Make sure MAD registration (if supplied) 422 * is non overlapping with any existing ones 423 */ 424 spin_lock_irq(&port_priv->reg_lock); 425 if (mad_reg_req) { 426 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class); 427 if (!is_vendor_class(mgmt_class)) { 428 class = port_priv->version[mad_reg_req-> 429 mgmt_class_version].class; 430 if (class) { 431 method = class->method_table[mgmt_class]; 432 if (method) { 433 if (method_in_use(&method, 434 mad_reg_req)) 435 goto error6; 436 } 437 } 438 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv, 439 mgmt_class); 440 } else { 441 /* "New" vendor class range */ 442 vendor = port_priv->version[mad_reg_req-> 443 mgmt_class_version].vendor; 444 if (vendor) { 445 vclass = vendor_class_index(mgmt_class); 446 vendor_class = vendor->vendor_class[vclass]; 447 if (vendor_class) { 448 if (is_vendor_method_in_use( 449 vendor_class, 450 mad_reg_req)) 451 goto error6; 452 } 453 } 454 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv); 455 } 456 if (ret2) { 457 ret = ERR_PTR(ret2); 458 goto error6; 459 } 460 } 461 spin_unlock_irq(&port_priv->reg_lock); 462 463 trace_ib_mad_create_agent(mad_agent_priv); 464 return &mad_agent_priv->agent; 465 error6: 466 spin_unlock_irq(&port_priv->reg_lock); 467 xa_erase(&ib_mad_clients, mad_agent_priv->agent.hi_tid); 468 error5: 469 ib_mad_agent_security_cleanup(&mad_agent_priv->agent); 470 error4: 471 kfree(reg_req); 472 error3: 473 kfree(mad_agent_priv); 474 error1: 475 return ret; 476 } 477 EXPORT_SYMBOL(ib_register_mad_agent); 478 deref_mad_agent(struct ib_mad_agent_private * mad_agent_priv)479 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv) 480 { 481 if (refcount_dec_and_test(&mad_agent_priv->refcount)) 482 complete(&mad_agent_priv->comp); 483 } 484 unregister_mad_agent(struct ib_mad_agent_private * mad_agent_priv)485 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv) 486 { 487 struct ib_mad_port_private *port_priv; 488 489 /* Note that we could still be handling received MADs */ 490 trace_ib_mad_unregister_agent(mad_agent_priv); 491 492 /* 493 * Canceling all sends results in dropping received response 494 * MADs, preventing us from queuing additional work 495 */ 496 cancel_mads(mad_agent_priv); 497 port_priv = mad_agent_priv->qp_info->port_priv; 498 cancel_delayed_work(&mad_agent_priv->timed_work); 499 500 spin_lock_irq(&port_priv->reg_lock); 501 remove_mad_reg_req(mad_agent_priv); 502 spin_unlock_irq(&port_priv->reg_lock); 503 xa_erase(&ib_mad_clients, mad_agent_priv->agent.hi_tid); 504 505 flush_workqueue(port_priv->wq); 506 507 deref_mad_agent(mad_agent_priv); 508 wait_for_completion(&mad_agent_priv->comp); 509 ib_cancel_rmpp_recvs(mad_agent_priv); 510 511 ib_mad_agent_security_cleanup(&mad_agent_priv->agent); 512 513 kfree(mad_agent_priv->reg_req); 514 kfree_rcu(mad_agent_priv, rcu); 515 } 516 517 /* 518 * ib_unregister_mad_agent - Unregisters a client from using MAD services 519 * 520 * Context: Process context. 521 */ ib_unregister_mad_agent(struct ib_mad_agent * mad_agent)522 void ib_unregister_mad_agent(struct ib_mad_agent *mad_agent) 523 { 524 struct ib_mad_agent_private *mad_agent_priv; 525 526 mad_agent_priv = container_of(mad_agent, 527 struct ib_mad_agent_private, 528 agent); 529 unregister_mad_agent(mad_agent_priv); 530 } 531 EXPORT_SYMBOL(ib_unregister_mad_agent); 532 dequeue_mad(struct ib_mad_list_head * mad_list)533 static void dequeue_mad(struct ib_mad_list_head *mad_list) 534 { 535 struct ib_mad_queue *mad_queue; 536 unsigned long flags; 537 538 mad_queue = mad_list->mad_queue; 539 spin_lock_irqsave(&mad_queue->lock, flags); 540 list_del(&mad_list->list); 541 mad_queue->count--; 542 spin_unlock_irqrestore(&mad_queue->lock, flags); 543 } 544 build_smp_wc(struct ib_qp * qp,struct ib_cqe * cqe,u16 slid,u16 pkey_index,u32 port_num,struct ib_wc * wc)545 static void build_smp_wc(struct ib_qp *qp, struct ib_cqe *cqe, u16 slid, 546 u16 pkey_index, u32 port_num, struct ib_wc *wc) 547 { 548 memset(wc, 0, sizeof *wc); 549 wc->wr_cqe = cqe; 550 wc->status = IB_WC_SUCCESS; 551 wc->opcode = IB_WC_RECV; 552 wc->pkey_index = pkey_index; 553 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh); 554 wc->src_qp = IB_QP0; 555 wc->qp = qp; 556 wc->slid = slid; 557 wc->sl = 0; 558 wc->dlid_path_bits = 0; 559 wc->port_num = port_num; 560 } 561 mad_priv_size(const struct ib_mad_private * mp)562 static size_t mad_priv_size(const struct ib_mad_private *mp) 563 { 564 return sizeof(struct ib_mad_private) + mp->mad_size; 565 } 566 alloc_mad_private(size_t mad_size,gfp_t flags)567 static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags) 568 { 569 size_t size = sizeof(struct ib_mad_private) + mad_size; 570 struct ib_mad_private *ret = kzalloc(size, flags); 571 572 if (ret) 573 ret->mad_size = mad_size; 574 575 return ret; 576 } 577 port_mad_size(const struct ib_mad_port_private * port_priv)578 static size_t port_mad_size(const struct ib_mad_port_private *port_priv) 579 { 580 return rdma_max_mad_size(port_priv->device, port_priv->port_num); 581 } 582 mad_priv_dma_size(const struct ib_mad_private * mp)583 static size_t mad_priv_dma_size(const struct ib_mad_private *mp) 584 { 585 return sizeof(struct ib_grh) + mp->mad_size; 586 } 587 588 /* 589 * Return 0 if SMP is to be sent 590 * Return 1 if SMP was consumed locally (whether or not solicited) 591 * Return < 0 if error 592 */ handle_outgoing_dr_smp(struct ib_mad_agent_private * mad_agent_priv,struct ib_mad_send_wr_private * mad_send_wr)593 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv, 594 struct ib_mad_send_wr_private *mad_send_wr) 595 { 596 int ret = 0; 597 struct ib_smp *smp = mad_send_wr->send_buf.mad; 598 struct opa_smp *opa_smp = (struct opa_smp *)smp; 599 unsigned long flags; 600 struct ib_mad_local_private *local; 601 struct ib_mad_private *mad_priv; 602 struct ib_mad_port_private *port_priv; 603 struct ib_mad_agent_private *recv_mad_agent = NULL; 604 struct ib_device *device = mad_agent_priv->agent.device; 605 u32 port_num; 606 struct ib_wc mad_wc; 607 struct ib_ud_wr *send_wr = &mad_send_wr->send_wr; 608 size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv); 609 u16 out_mad_pkey_index = 0; 610 u16 drslid; 611 bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device, 612 mad_agent_priv->qp_info->port_priv->port_num); 613 614 if (rdma_cap_ib_switch(device) && 615 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 616 port_num = send_wr->port_num; 617 else 618 port_num = mad_agent_priv->agent.port_num; 619 620 /* 621 * Directed route handling starts if the initial LID routed part of 622 * a request or the ending LID routed part of a response is empty. 623 * If we are at the start of the LID routed part, don't update the 624 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec. 625 */ 626 if (opa && smp->class_version == OPA_SM_CLASS_VERSION) { 627 u32 opa_drslid; 628 629 trace_ib_mad_handle_out_opa_smi(opa_smp); 630 631 if ((opa_get_smp_direction(opa_smp) 632 ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) == 633 OPA_LID_PERMISSIVE && 634 opa_smi_handle_dr_smp_send(opa_smp, 635 rdma_cap_ib_switch(device), 636 port_num) == IB_SMI_DISCARD) { 637 ret = -EINVAL; 638 dev_err(&device->dev, "OPA Invalid directed route\n"); 639 goto out; 640 } 641 opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid); 642 if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) && 643 opa_drslid & 0xffff0000) { 644 ret = -EINVAL; 645 dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n", 646 opa_drslid); 647 goto out; 648 } 649 drslid = (u16)(opa_drslid & 0x0000ffff); 650 651 /* Check to post send on QP or process locally */ 652 if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD && 653 opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD) 654 goto out; 655 } else { 656 trace_ib_mad_handle_out_ib_smi(smp); 657 658 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) == 659 IB_LID_PERMISSIVE && 660 smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) == 661 IB_SMI_DISCARD) { 662 ret = -EINVAL; 663 dev_err(&device->dev, "Invalid directed route\n"); 664 goto out; 665 } 666 drslid = be16_to_cpu(smp->dr_slid); 667 668 /* Check to post send on QP or process locally */ 669 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD && 670 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD) 671 goto out; 672 } 673 674 local = kmalloc(sizeof *local, GFP_ATOMIC); 675 if (!local) { 676 ret = -ENOMEM; 677 goto out; 678 } 679 local->mad_priv = NULL; 680 local->recv_mad_agent = NULL; 681 mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC); 682 if (!mad_priv) { 683 ret = -ENOMEM; 684 kfree(local); 685 goto out; 686 } 687 688 build_smp_wc(mad_agent_priv->agent.qp, 689 send_wr->wr.wr_cqe, drslid, 690 send_wr->pkey_index, 691 send_wr->port_num, &mad_wc); 692 693 if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) { 694 mad_wc.byte_len = mad_send_wr->send_buf.hdr_len 695 + mad_send_wr->send_buf.data_len 696 + sizeof(struct ib_grh); 697 } 698 699 /* No GRH for DR SMP */ 700 ret = device->ops.process_mad(device, 0, port_num, &mad_wc, NULL, 701 (const struct ib_mad *)smp, 702 (struct ib_mad *)mad_priv->mad, &mad_size, 703 &out_mad_pkey_index); 704 switch (ret) { 705 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY: 706 if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) && 707 mad_agent_priv->agent.recv_handler) { 708 local->mad_priv = mad_priv; 709 local->recv_mad_agent = mad_agent_priv; 710 /* 711 * Reference MAD agent until receive 712 * side of local completion handled 713 */ 714 refcount_inc(&mad_agent_priv->refcount); 715 } else 716 kfree(mad_priv); 717 break; 718 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED: 719 kfree(mad_priv); 720 break; 721 case IB_MAD_RESULT_SUCCESS: 722 /* Treat like an incoming receive MAD */ 723 port_priv = ib_get_mad_port(mad_agent_priv->agent.device, 724 mad_agent_priv->agent.port_num); 725 if (port_priv) { 726 memcpy(mad_priv->mad, smp, mad_priv->mad_size); 727 recv_mad_agent = find_mad_agent(port_priv, 728 (const struct ib_mad_hdr *)mad_priv->mad); 729 } 730 if (!port_priv || !recv_mad_agent) { 731 /* 732 * No receiving agent so drop packet and 733 * generate send completion. 734 */ 735 kfree(mad_priv); 736 break; 737 } 738 local->mad_priv = mad_priv; 739 local->recv_mad_agent = recv_mad_agent; 740 break; 741 default: 742 kfree(mad_priv); 743 kfree(local); 744 ret = -EINVAL; 745 goto out; 746 } 747 748 local->mad_send_wr = mad_send_wr; 749 if (opa) { 750 local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index; 751 local->return_wc_byte_len = mad_size; 752 } 753 /* Reference MAD agent until send side of local completion handled */ 754 refcount_inc(&mad_agent_priv->refcount); 755 /* Queue local completion to local list */ 756 spin_lock_irqsave(&mad_agent_priv->lock, flags); 757 list_add_tail(&local->completion_list, &mad_agent_priv->local_list); 758 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 759 queue_work(mad_agent_priv->qp_info->port_priv->wq, 760 &mad_agent_priv->local_work); 761 ret = 1; 762 out: 763 return ret; 764 } 765 get_pad_size(int hdr_len,int data_len,size_t mad_size)766 static int get_pad_size(int hdr_len, int data_len, size_t mad_size) 767 { 768 int seg_size, pad; 769 770 seg_size = mad_size - hdr_len; 771 if (data_len && seg_size) { 772 pad = seg_size - data_len % seg_size; 773 return pad == seg_size ? 0 : pad; 774 } else 775 return seg_size; 776 } 777 free_send_rmpp_list(struct ib_mad_send_wr_private * mad_send_wr)778 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr) 779 { 780 struct ib_rmpp_segment *s, *t; 781 782 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) { 783 list_del(&s->list); 784 kfree(s); 785 } 786 } 787 alloc_send_rmpp_list(struct ib_mad_send_wr_private * send_wr,size_t mad_size,gfp_t gfp_mask)788 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr, 789 size_t mad_size, gfp_t gfp_mask) 790 { 791 struct ib_mad_send_buf *send_buf = &send_wr->send_buf; 792 struct ib_rmpp_mad *rmpp_mad = send_buf->mad; 793 struct ib_rmpp_segment *seg = NULL; 794 int left, seg_size, pad; 795 796 send_buf->seg_size = mad_size - send_buf->hdr_len; 797 send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR; 798 seg_size = send_buf->seg_size; 799 pad = send_wr->pad; 800 801 /* Allocate data segments. */ 802 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) { 803 seg = kmalloc(sizeof(*seg) + seg_size, gfp_mask); 804 if (!seg) { 805 free_send_rmpp_list(send_wr); 806 return -ENOMEM; 807 } 808 seg->num = ++send_buf->seg_count; 809 list_add_tail(&seg->list, &send_wr->rmpp_list); 810 } 811 812 /* Zero any padding */ 813 if (pad) 814 memset(seg->data + seg_size - pad, 0, pad); 815 816 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv-> 817 agent.rmpp_version; 818 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA; 819 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 820 821 send_wr->cur_seg = container_of(send_wr->rmpp_list.next, 822 struct ib_rmpp_segment, list); 823 send_wr->last_ack_seg = send_wr->cur_seg; 824 return 0; 825 } 826 ib_mad_kernel_rmpp_agent(const struct ib_mad_agent * agent)827 int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent) 828 { 829 return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP); 830 } 831 EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent); 832 ib_create_send_mad(struct ib_mad_agent * mad_agent,u32 remote_qpn,u16 pkey_index,int rmpp_active,int hdr_len,int data_len,gfp_t gfp_mask,u8 base_version)833 struct ib_mad_send_buf *ib_create_send_mad(struct ib_mad_agent *mad_agent, 834 u32 remote_qpn, u16 pkey_index, 835 int rmpp_active, int hdr_len, 836 int data_len, gfp_t gfp_mask, 837 u8 base_version) 838 { 839 struct ib_mad_agent_private *mad_agent_priv; 840 struct ib_mad_send_wr_private *mad_send_wr; 841 int pad, message_size, ret, size; 842 void *buf; 843 size_t mad_size; 844 bool opa; 845 846 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, 847 agent); 848 849 opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num); 850 851 if (opa && base_version == OPA_MGMT_BASE_VERSION) 852 mad_size = sizeof(struct opa_mad); 853 else 854 mad_size = sizeof(struct ib_mad); 855 856 pad = get_pad_size(hdr_len, data_len, mad_size); 857 message_size = hdr_len + data_len + pad; 858 859 if (ib_mad_kernel_rmpp_agent(mad_agent)) { 860 if (!rmpp_active && message_size > mad_size) 861 return ERR_PTR(-EINVAL); 862 } else 863 if (rmpp_active || message_size > mad_size) 864 return ERR_PTR(-EINVAL); 865 866 size = rmpp_active ? hdr_len : mad_size; 867 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask); 868 if (!buf) 869 return ERR_PTR(-ENOMEM); 870 871 mad_send_wr = buf + size; 872 INIT_LIST_HEAD(&mad_send_wr->rmpp_list); 873 mad_send_wr->send_buf.mad = buf; 874 mad_send_wr->send_buf.hdr_len = hdr_len; 875 mad_send_wr->send_buf.data_len = data_len; 876 mad_send_wr->pad = pad; 877 878 mad_send_wr->mad_agent_priv = mad_agent_priv; 879 mad_send_wr->sg_list[0].length = hdr_len; 880 mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey; 881 882 /* OPA MADs don't have to be the full 2048 bytes */ 883 if (opa && base_version == OPA_MGMT_BASE_VERSION && 884 data_len < mad_size - hdr_len) 885 mad_send_wr->sg_list[1].length = data_len; 886 else 887 mad_send_wr->sg_list[1].length = mad_size - hdr_len; 888 889 mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey; 890 891 mad_send_wr->mad_list.cqe.done = ib_mad_send_done; 892 893 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe; 894 mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list; 895 mad_send_wr->send_wr.wr.num_sge = 2; 896 mad_send_wr->send_wr.wr.opcode = IB_WR_SEND; 897 mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED; 898 mad_send_wr->send_wr.remote_qpn = remote_qpn; 899 mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY; 900 mad_send_wr->send_wr.pkey_index = pkey_index; 901 902 if (rmpp_active) { 903 ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask); 904 if (ret) { 905 kfree(buf); 906 return ERR_PTR(ret); 907 } 908 } 909 910 mad_send_wr->send_buf.mad_agent = mad_agent; 911 refcount_inc(&mad_agent_priv->refcount); 912 return &mad_send_wr->send_buf; 913 } 914 EXPORT_SYMBOL(ib_create_send_mad); 915 ib_get_mad_data_offset(u8 mgmt_class)916 int ib_get_mad_data_offset(u8 mgmt_class) 917 { 918 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM) 919 return IB_MGMT_SA_HDR; 920 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) || 921 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) || 922 (mgmt_class == IB_MGMT_CLASS_BIS)) 923 return IB_MGMT_DEVICE_HDR; 924 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && 925 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)) 926 return IB_MGMT_VENDOR_HDR; 927 else 928 return IB_MGMT_MAD_HDR; 929 } 930 EXPORT_SYMBOL(ib_get_mad_data_offset); 931 ib_is_mad_class_rmpp(u8 mgmt_class)932 int ib_is_mad_class_rmpp(u8 mgmt_class) 933 { 934 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) || 935 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) || 936 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) || 937 (mgmt_class == IB_MGMT_CLASS_BIS) || 938 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && 939 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))) 940 return 1; 941 return 0; 942 } 943 EXPORT_SYMBOL(ib_is_mad_class_rmpp); 944 ib_get_rmpp_segment(struct ib_mad_send_buf * send_buf,int seg_num)945 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num) 946 { 947 struct ib_mad_send_wr_private *mad_send_wr; 948 struct list_head *list; 949 950 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private, 951 send_buf); 952 list = &mad_send_wr->cur_seg->list; 953 954 if (mad_send_wr->cur_seg->num < seg_num) { 955 list_for_each_entry(mad_send_wr->cur_seg, list, list) 956 if (mad_send_wr->cur_seg->num == seg_num) 957 break; 958 } else if (mad_send_wr->cur_seg->num > seg_num) { 959 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list) 960 if (mad_send_wr->cur_seg->num == seg_num) 961 break; 962 } 963 return mad_send_wr->cur_seg->data; 964 } 965 EXPORT_SYMBOL(ib_get_rmpp_segment); 966 ib_get_payload(struct ib_mad_send_wr_private * mad_send_wr)967 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr) 968 { 969 if (mad_send_wr->send_buf.seg_count) 970 return ib_get_rmpp_segment(&mad_send_wr->send_buf, 971 mad_send_wr->seg_num); 972 else 973 return mad_send_wr->send_buf.mad + 974 mad_send_wr->send_buf.hdr_len; 975 } 976 ib_free_send_mad(struct ib_mad_send_buf * send_buf)977 void ib_free_send_mad(struct ib_mad_send_buf *send_buf) 978 { 979 struct ib_mad_agent_private *mad_agent_priv; 980 struct ib_mad_send_wr_private *mad_send_wr; 981 982 mad_agent_priv = container_of(send_buf->mad_agent, 983 struct ib_mad_agent_private, agent); 984 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private, 985 send_buf); 986 987 free_send_rmpp_list(mad_send_wr); 988 kfree(send_buf->mad); 989 deref_mad_agent(mad_agent_priv); 990 } 991 EXPORT_SYMBOL(ib_free_send_mad); 992 ib_send_mad(struct ib_mad_send_wr_private * mad_send_wr)993 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr) 994 { 995 struct ib_mad_qp_info *qp_info; 996 struct list_head *list; 997 struct ib_mad_agent *mad_agent; 998 struct ib_sge *sge; 999 unsigned long flags; 1000 int ret; 1001 1002 /* Set WR ID to find mad_send_wr upon completion */ 1003 qp_info = mad_send_wr->mad_agent_priv->qp_info; 1004 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue; 1005 mad_send_wr->mad_list.cqe.done = ib_mad_send_done; 1006 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe; 1007 1008 mad_agent = mad_send_wr->send_buf.mad_agent; 1009 sge = mad_send_wr->sg_list; 1010 sge[0].addr = ib_dma_map_single(mad_agent->device, 1011 mad_send_wr->send_buf.mad, 1012 sge[0].length, 1013 DMA_TO_DEVICE); 1014 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr))) 1015 return -ENOMEM; 1016 1017 mad_send_wr->header_mapping = sge[0].addr; 1018 1019 sge[1].addr = ib_dma_map_single(mad_agent->device, 1020 ib_get_payload(mad_send_wr), 1021 sge[1].length, 1022 DMA_TO_DEVICE); 1023 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) { 1024 ib_dma_unmap_single(mad_agent->device, 1025 mad_send_wr->header_mapping, 1026 sge[0].length, DMA_TO_DEVICE); 1027 return -ENOMEM; 1028 } 1029 mad_send_wr->payload_mapping = sge[1].addr; 1030 1031 spin_lock_irqsave(&qp_info->send_queue.lock, flags); 1032 if (qp_info->send_queue.count < qp_info->send_queue.max_active) { 1033 trace_ib_mad_ib_send_mad(mad_send_wr, qp_info); 1034 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr, 1035 NULL); 1036 list = &qp_info->send_queue.list; 1037 } else { 1038 ret = 0; 1039 list = &qp_info->overflow_list; 1040 } 1041 1042 if (!ret) { 1043 qp_info->send_queue.count++; 1044 list_add_tail(&mad_send_wr->mad_list.list, list); 1045 } 1046 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); 1047 if (ret) { 1048 ib_dma_unmap_single(mad_agent->device, 1049 mad_send_wr->header_mapping, 1050 sge[0].length, DMA_TO_DEVICE); 1051 ib_dma_unmap_single(mad_agent->device, 1052 mad_send_wr->payload_mapping, 1053 sge[1].length, DMA_TO_DEVICE); 1054 } 1055 return ret; 1056 } 1057 1058 /* 1059 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated 1060 * with the registered client 1061 */ ib_post_send_mad(struct ib_mad_send_buf * send_buf,struct ib_mad_send_buf ** bad_send_buf)1062 int ib_post_send_mad(struct ib_mad_send_buf *send_buf, 1063 struct ib_mad_send_buf **bad_send_buf) 1064 { 1065 struct ib_mad_agent_private *mad_agent_priv; 1066 struct ib_mad_send_buf *next_send_buf; 1067 struct ib_mad_send_wr_private *mad_send_wr; 1068 unsigned long flags; 1069 int ret = -EINVAL; 1070 1071 /* Walk list of send WRs and post each on send list */ 1072 for (; send_buf; send_buf = next_send_buf) { 1073 mad_send_wr = container_of(send_buf, 1074 struct ib_mad_send_wr_private, 1075 send_buf); 1076 mad_agent_priv = mad_send_wr->mad_agent_priv; 1077 1078 ret = ib_mad_enforce_security(mad_agent_priv, 1079 mad_send_wr->send_wr.pkey_index); 1080 if (ret) 1081 goto error; 1082 1083 if (!send_buf->mad_agent->send_handler || 1084 (send_buf->timeout_ms && 1085 !send_buf->mad_agent->recv_handler)) { 1086 ret = -EINVAL; 1087 goto error; 1088 } 1089 1090 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) { 1091 if (mad_agent_priv->agent.rmpp_version) { 1092 ret = -EINVAL; 1093 goto error; 1094 } 1095 } 1096 1097 /* 1098 * Save pointer to next work request to post in case the 1099 * current one completes, and the user modifies the work 1100 * request associated with the completion 1101 */ 1102 next_send_buf = send_buf->next; 1103 mad_send_wr->send_wr.ah = send_buf->ah; 1104 1105 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class == 1106 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 1107 ret = handle_outgoing_dr_smp(mad_agent_priv, 1108 mad_send_wr); 1109 if (ret < 0) /* error */ 1110 goto error; 1111 else if (ret == 1) /* locally consumed */ 1112 continue; 1113 } 1114 1115 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid; 1116 /* Timeout will be updated after send completes */ 1117 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms); 1118 mad_send_wr->max_retries = send_buf->retries; 1119 mad_send_wr->retries_left = send_buf->retries; 1120 send_buf->retries = 0; 1121 /* Reference for work request to QP + response */ 1122 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0); 1123 mad_send_wr->status = IB_WC_SUCCESS; 1124 1125 /* Reference MAD agent until send completes */ 1126 refcount_inc(&mad_agent_priv->refcount); 1127 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1128 list_add_tail(&mad_send_wr->agent_list, 1129 &mad_agent_priv->send_list); 1130 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1131 1132 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) { 1133 ret = ib_send_rmpp_mad(mad_send_wr); 1134 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED) 1135 ret = ib_send_mad(mad_send_wr); 1136 } else 1137 ret = ib_send_mad(mad_send_wr); 1138 if (ret < 0) { 1139 /* Fail send request */ 1140 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1141 list_del(&mad_send_wr->agent_list); 1142 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1143 deref_mad_agent(mad_agent_priv); 1144 goto error; 1145 } 1146 } 1147 return 0; 1148 error: 1149 if (bad_send_buf) 1150 *bad_send_buf = send_buf; 1151 return ret; 1152 } 1153 EXPORT_SYMBOL(ib_post_send_mad); 1154 1155 /* 1156 * ib_free_recv_mad - Returns data buffers used to receive 1157 * a MAD to the access layer 1158 */ ib_free_recv_mad(struct ib_mad_recv_wc * mad_recv_wc)1159 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc) 1160 { 1161 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf; 1162 struct ib_mad_private_header *mad_priv_hdr; 1163 struct ib_mad_private *priv; 1164 struct list_head free_list; 1165 1166 INIT_LIST_HEAD(&free_list); 1167 list_splice_init(&mad_recv_wc->rmpp_list, &free_list); 1168 1169 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf, 1170 &free_list, list) { 1171 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc, 1172 recv_buf); 1173 mad_priv_hdr = container_of(mad_recv_wc, 1174 struct ib_mad_private_header, 1175 recv_wc); 1176 priv = container_of(mad_priv_hdr, struct ib_mad_private, 1177 header); 1178 kfree(priv); 1179 } 1180 } 1181 EXPORT_SYMBOL(ib_free_recv_mad); 1182 method_in_use(struct ib_mad_mgmt_method_table ** method,struct ib_mad_reg_req * mad_reg_req)1183 static int method_in_use(struct ib_mad_mgmt_method_table **method, 1184 struct ib_mad_reg_req *mad_reg_req) 1185 { 1186 int i; 1187 1188 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) { 1189 if ((*method)->agent[i]) { 1190 pr_err("Method %d already in use\n", i); 1191 return -EINVAL; 1192 } 1193 } 1194 return 0; 1195 } 1196 allocate_method_table(struct ib_mad_mgmt_method_table ** method)1197 static int allocate_method_table(struct ib_mad_mgmt_method_table **method) 1198 { 1199 /* Allocate management method table */ 1200 *method = kzalloc(sizeof **method, GFP_ATOMIC); 1201 return (*method) ? 0 : (-ENOMEM); 1202 } 1203 1204 /* 1205 * Check to see if there are any methods still in use 1206 */ check_method_table(struct ib_mad_mgmt_method_table * method)1207 static int check_method_table(struct ib_mad_mgmt_method_table *method) 1208 { 1209 int i; 1210 1211 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) 1212 if (method->agent[i]) 1213 return 1; 1214 return 0; 1215 } 1216 1217 /* 1218 * Check to see if there are any method tables for this class still in use 1219 */ check_class_table(struct ib_mad_mgmt_class_table * class)1220 static int check_class_table(struct ib_mad_mgmt_class_table *class) 1221 { 1222 int i; 1223 1224 for (i = 0; i < MAX_MGMT_CLASS; i++) 1225 if (class->method_table[i]) 1226 return 1; 1227 return 0; 1228 } 1229 check_vendor_class(struct ib_mad_mgmt_vendor_class * vendor_class)1230 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class) 1231 { 1232 int i; 1233 1234 for (i = 0; i < MAX_MGMT_OUI; i++) 1235 if (vendor_class->method_table[i]) 1236 return 1; 1237 return 0; 1238 } 1239 find_vendor_oui(struct ib_mad_mgmt_vendor_class * vendor_class,const char * oui)1240 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class, 1241 const char *oui) 1242 { 1243 int i; 1244 1245 for (i = 0; i < MAX_MGMT_OUI; i++) 1246 /* Is there matching OUI for this vendor class ? */ 1247 if (!memcmp(vendor_class->oui[i], oui, 3)) 1248 return i; 1249 1250 return -1; 1251 } 1252 check_vendor_table(struct ib_mad_mgmt_vendor_class_table * vendor)1253 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor) 1254 { 1255 int i; 1256 1257 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++) 1258 if (vendor->vendor_class[i]) 1259 return 1; 1260 1261 return 0; 1262 } 1263 remove_methods_mad_agent(struct ib_mad_mgmt_method_table * method,struct ib_mad_agent_private * agent)1264 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method, 1265 struct ib_mad_agent_private *agent) 1266 { 1267 int i; 1268 1269 /* Remove any methods for this mad agent */ 1270 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) 1271 if (method->agent[i] == agent) 1272 method->agent[i] = NULL; 1273 } 1274 add_nonoui_reg_req(struct ib_mad_reg_req * mad_reg_req,struct ib_mad_agent_private * agent_priv,u8 mgmt_class)1275 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req, 1276 struct ib_mad_agent_private *agent_priv, 1277 u8 mgmt_class) 1278 { 1279 struct ib_mad_port_private *port_priv; 1280 struct ib_mad_mgmt_class_table **class; 1281 struct ib_mad_mgmt_method_table **method; 1282 int i, ret; 1283 1284 port_priv = agent_priv->qp_info->port_priv; 1285 class = &port_priv->version[mad_reg_req->mgmt_class_version].class; 1286 if (!*class) { 1287 /* Allocate management class table for "new" class version */ 1288 *class = kzalloc(sizeof **class, GFP_ATOMIC); 1289 if (!*class) { 1290 ret = -ENOMEM; 1291 goto error1; 1292 } 1293 1294 /* Allocate method table for this management class */ 1295 method = &(*class)->method_table[mgmt_class]; 1296 if ((ret = allocate_method_table(method))) 1297 goto error2; 1298 } else { 1299 method = &(*class)->method_table[mgmt_class]; 1300 if (!*method) { 1301 /* Allocate method table for this management class */ 1302 if ((ret = allocate_method_table(method))) 1303 goto error1; 1304 } 1305 } 1306 1307 /* Now, make sure methods are not already in use */ 1308 if (method_in_use(method, mad_reg_req)) 1309 goto error3; 1310 1311 /* Finally, add in methods being registered */ 1312 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) 1313 (*method)->agent[i] = agent_priv; 1314 1315 return 0; 1316 1317 error3: 1318 /* Remove any methods for this mad agent */ 1319 remove_methods_mad_agent(*method, agent_priv); 1320 /* Now, check to see if there are any methods in use */ 1321 if (!check_method_table(*method)) { 1322 /* If not, release management method table */ 1323 kfree(*method); 1324 *method = NULL; 1325 } 1326 ret = -EINVAL; 1327 goto error1; 1328 error2: 1329 kfree(*class); 1330 *class = NULL; 1331 error1: 1332 return ret; 1333 } 1334 add_oui_reg_req(struct ib_mad_reg_req * mad_reg_req,struct ib_mad_agent_private * agent_priv)1335 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req, 1336 struct ib_mad_agent_private *agent_priv) 1337 { 1338 struct ib_mad_port_private *port_priv; 1339 struct ib_mad_mgmt_vendor_class_table **vendor_table; 1340 struct ib_mad_mgmt_vendor_class_table *vendor = NULL; 1341 struct ib_mad_mgmt_vendor_class *vendor_class = NULL; 1342 struct ib_mad_mgmt_method_table **method; 1343 int i, ret = -ENOMEM; 1344 u8 vclass; 1345 1346 /* "New" vendor (with OUI) class */ 1347 vclass = vendor_class_index(mad_reg_req->mgmt_class); 1348 port_priv = agent_priv->qp_info->port_priv; 1349 vendor_table = &port_priv->version[ 1350 mad_reg_req->mgmt_class_version].vendor; 1351 if (!*vendor_table) { 1352 /* Allocate mgmt vendor class table for "new" class version */ 1353 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC); 1354 if (!vendor) 1355 goto error1; 1356 1357 *vendor_table = vendor; 1358 } 1359 if (!(*vendor_table)->vendor_class[vclass]) { 1360 /* Allocate table for this management vendor class */ 1361 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC); 1362 if (!vendor_class) 1363 goto error2; 1364 1365 (*vendor_table)->vendor_class[vclass] = vendor_class; 1366 } 1367 for (i = 0; i < MAX_MGMT_OUI; i++) { 1368 /* Is there matching OUI for this vendor class ? */ 1369 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i], 1370 mad_reg_req->oui, 3)) { 1371 method = &(*vendor_table)->vendor_class[ 1372 vclass]->method_table[i]; 1373 if (!*method) 1374 goto error3; 1375 goto check_in_use; 1376 } 1377 } 1378 for (i = 0; i < MAX_MGMT_OUI; i++) { 1379 /* OUI slot available ? */ 1380 if (!is_vendor_oui((*vendor_table)->vendor_class[ 1381 vclass]->oui[i])) { 1382 method = &(*vendor_table)->vendor_class[ 1383 vclass]->method_table[i]; 1384 /* Allocate method table for this OUI */ 1385 if (!*method) { 1386 ret = allocate_method_table(method); 1387 if (ret) 1388 goto error3; 1389 } 1390 memcpy((*vendor_table)->vendor_class[vclass]->oui[i], 1391 mad_reg_req->oui, 3); 1392 goto check_in_use; 1393 } 1394 } 1395 dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n"); 1396 goto error3; 1397 1398 check_in_use: 1399 /* Now, make sure methods are not already in use */ 1400 if (method_in_use(method, mad_reg_req)) 1401 goto error4; 1402 1403 /* Finally, add in methods being registered */ 1404 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) 1405 (*method)->agent[i] = agent_priv; 1406 1407 return 0; 1408 1409 error4: 1410 /* Remove any methods for this mad agent */ 1411 remove_methods_mad_agent(*method, agent_priv); 1412 /* Now, check to see if there are any methods in use */ 1413 if (!check_method_table(*method)) { 1414 /* If not, release management method table */ 1415 kfree(*method); 1416 *method = NULL; 1417 } 1418 ret = -EINVAL; 1419 error3: 1420 if (vendor_class) { 1421 (*vendor_table)->vendor_class[vclass] = NULL; 1422 kfree(vendor_class); 1423 } 1424 error2: 1425 if (vendor) { 1426 *vendor_table = NULL; 1427 kfree(vendor); 1428 } 1429 error1: 1430 return ret; 1431 } 1432 remove_mad_reg_req(struct ib_mad_agent_private * agent_priv)1433 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv) 1434 { 1435 struct ib_mad_port_private *port_priv; 1436 struct ib_mad_mgmt_class_table *class; 1437 struct ib_mad_mgmt_method_table *method; 1438 struct ib_mad_mgmt_vendor_class_table *vendor; 1439 struct ib_mad_mgmt_vendor_class *vendor_class; 1440 int index; 1441 u8 mgmt_class; 1442 1443 /* 1444 * Was MAD registration request supplied 1445 * with original registration ? 1446 */ 1447 if (!agent_priv->reg_req) 1448 goto out; 1449 1450 port_priv = agent_priv->qp_info->port_priv; 1451 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class); 1452 class = port_priv->version[ 1453 agent_priv->reg_req->mgmt_class_version].class; 1454 if (!class) 1455 goto vendor_check; 1456 1457 method = class->method_table[mgmt_class]; 1458 if (method) { 1459 /* Remove any methods for this mad agent */ 1460 remove_methods_mad_agent(method, agent_priv); 1461 /* Now, check to see if there are any methods still in use */ 1462 if (!check_method_table(method)) { 1463 /* If not, release management method table */ 1464 kfree(method); 1465 class->method_table[mgmt_class] = NULL; 1466 /* Any management classes left ? */ 1467 if (!check_class_table(class)) { 1468 /* If not, release management class table */ 1469 kfree(class); 1470 port_priv->version[ 1471 agent_priv->reg_req-> 1472 mgmt_class_version].class = NULL; 1473 } 1474 } 1475 } 1476 1477 vendor_check: 1478 if (!is_vendor_class(mgmt_class)) 1479 goto out; 1480 1481 /* normalize mgmt_class to vendor range 2 */ 1482 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class); 1483 vendor = port_priv->version[ 1484 agent_priv->reg_req->mgmt_class_version].vendor; 1485 1486 if (!vendor) 1487 goto out; 1488 1489 vendor_class = vendor->vendor_class[mgmt_class]; 1490 if (vendor_class) { 1491 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui); 1492 if (index < 0) 1493 goto out; 1494 method = vendor_class->method_table[index]; 1495 if (method) { 1496 /* Remove any methods for this mad agent */ 1497 remove_methods_mad_agent(method, agent_priv); 1498 /* 1499 * Now, check to see if there are 1500 * any methods still in use 1501 */ 1502 if (!check_method_table(method)) { 1503 /* If not, release management method table */ 1504 kfree(method); 1505 vendor_class->method_table[index] = NULL; 1506 memset(vendor_class->oui[index], 0, 3); 1507 /* Any OUIs left ? */ 1508 if (!check_vendor_class(vendor_class)) { 1509 /* If not, release vendor class table */ 1510 kfree(vendor_class); 1511 vendor->vendor_class[mgmt_class] = NULL; 1512 /* Any other vendor classes left ? */ 1513 if (!check_vendor_table(vendor)) { 1514 kfree(vendor); 1515 port_priv->version[ 1516 agent_priv->reg_req-> 1517 mgmt_class_version]. 1518 vendor = NULL; 1519 } 1520 } 1521 } 1522 } 1523 } 1524 1525 out: 1526 return; 1527 } 1528 1529 static struct ib_mad_agent_private * find_mad_agent(struct ib_mad_port_private * port_priv,const struct ib_mad_hdr * mad_hdr)1530 find_mad_agent(struct ib_mad_port_private *port_priv, 1531 const struct ib_mad_hdr *mad_hdr) 1532 { 1533 struct ib_mad_agent_private *mad_agent = NULL; 1534 unsigned long flags; 1535 1536 if (ib_response_mad(mad_hdr)) { 1537 u32 hi_tid; 1538 1539 /* 1540 * Routing is based on high 32 bits of transaction ID 1541 * of MAD. 1542 */ 1543 hi_tid = be64_to_cpu(mad_hdr->tid) >> 32; 1544 rcu_read_lock(); 1545 mad_agent = xa_load(&ib_mad_clients, hi_tid); 1546 if (mad_agent && !refcount_inc_not_zero(&mad_agent->refcount)) 1547 mad_agent = NULL; 1548 rcu_read_unlock(); 1549 } else { 1550 struct ib_mad_mgmt_class_table *class; 1551 struct ib_mad_mgmt_method_table *method; 1552 struct ib_mad_mgmt_vendor_class_table *vendor; 1553 struct ib_mad_mgmt_vendor_class *vendor_class; 1554 const struct ib_vendor_mad *vendor_mad; 1555 int index; 1556 1557 spin_lock_irqsave(&port_priv->reg_lock, flags); 1558 /* 1559 * Routing is based on version, class, and method 1560 * For "newer" vendor MADs, also based on OUI 1561 */ 1562 if (mad_hdr->class_version >= MAX_MGMT_VERSION) 1563 goto out; 1564 if (!is_vendor_class(mad_hdr->mgmt_class)) { 1565 class = port_priv->version[ 1566 mad_hdr->class_version].class; 1567 if (!class) 1568 goto out; 1569 if (convert_mgmt_class(mad_hdr->mgmt_class) >= 1570 ARRAY_SIZE(class->method_table)) 1571 goto out; 1572 method = class->method_table[convert_mgmt_class( 1573 mad_hdr->mgmt_class)]; 1574 if (method) 1575 mad_agent = method->agent[mad_hdr->method & 1576 ~IB_MGMT_METHOD_RESP]; 1577 } else { 1578 vendor = port_priv->version[ 1579 mad_hdr->class_version].vendor; 1580 if (!vendor) 1581 goto out; 1582 vendor_class = vendor->vendor_class[vendor_class_index( 1583 mad_hdr->mgmt_class)]; 1584 if (!vendor_class) 1585 goto out; 1586 /* Find matching OUI */ 1587 vendor_mad = (const struct ib_vendor_mad *)mad_hdr; 1588 index = find_vendor_oui(vendor_class, vendor_mad->oui); 1589 if (index == -1) 1590 goto out; 1591 method = vendor_class->method_table[index]; 1592 if (method) { 1593 mad_agent = method->agent[mad_hdr->method & 1594 ~IB_MGMT_METHOD_RESP]; 1595 } 1596 } 1597 if (mad_agent) 1598 refcount_inc(&mad_agent->refcount); 1599 out: 1600 spin_unlock_irqrestore(&port_priv->reg_lock, flags); 1601 } 1602 1603 if (mad_agent && !mad_agent->agent.recv_handler) { 1604 dev_notice(&port_priv->device->dev, 1605 "No receive handler for client %p on port %u\n", 1606 &mad_agent->agent, port_priv->port_num); 1607 deref_mad_agent(mad_agent); 1608 mad_agent = NULL; 1609 } 1610 1611 return mad_agent; 1612 } 1613 validate_mad(const struct ib_mad_hdr * mad_hdr,const struct ib_mad_qp_info * qp_info,bool opa)1614 static int validate_mad(const struct ib_mad_hdr *mad_hdr, 1615 const struct ib_mad_qp_info *qp_info, 1616 bool opa) 1617 { 1618 int valid = 0; 1619 u32 qp_num = qp_info->qp->qp_num; 1620 1621 /* Make sure MAD base version is understood */ 1622 if (mad_hdr->base_version != IB_MGMT_BASE_VERSION && 1623 (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) { 1624 pr_err("MAD received with unsupported base version %u %s\n", 1625 mad_hdr->base_version, opa ? "(opa)" : ""); 1626 goto out; 1627 } 1628 1629 /* Filter SMI packets sent to other than QP0 */ 1630 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) || 1631 (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) { 1632 if (qp_num == 0) 1633 valid = 1; 1634 } else { 1635 /* CM attributes other than ClassPortInfo only use Send method */ 1636 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_CM) && 1637 (mad_hdr->attr_id != IB_MGMT_CLASSPORTINFO_ATTR_ID) && 1638 (mad_hdr->method != IB_MGMT_METHOD_SEND)) 1639 goto out; 1640 /* Filter GSI packets sent to QP0 */ 1641 if (qp_num != 0) 1642 valid = 1; 1643 } 1644 1645 out: 1646 return valid; 1647 } 1648 is_rmpp_data_mad(const struct ib_mad_agent_private * mad_agent_priv,const struct ib_mad_hdr * mad_hdr)1649 static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv, 1650 const struct ib_mad_hdr *mad_hdr) 1651 { 1652 struct ib_rmpp_mad *rmpp_mad; 1653 1654 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr; 1655 return !mad_agent_priv->agent.rmpp_version || 1656 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) || 1657 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 1658 IB_MGMT_RMPP_FLAG_ACTIVE) || 1659 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA); 1660 } 1661 rcv_has_same_class(const struct ib_mad_send_wr_private * wr,const struct ib_mad_recv_wc * rwc)1662 static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr, 1663 const struct ib_mad_recv_wc *rwc) 1664 { 1665 return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class == 1666 rwc->recv_buf.mad->mad_hdr.mgmt_class; 1667 } 1668 1669 static inline int rcv_has_same_gid(const struct ib_mad_agent_private * mad_agent_priv,const struct ib_mad_send_wr_private * wr,const struct ib_mad_recv_wc * rwc)1670 rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv, 1671 const struct ib_mad_send_wr_private *wr, 1672 const struct ib_mad_recv_wc *rwc) 1673 { 1674 struct rdma_ah_attr attr; 1675 u8 send_resp, rcv_resp; 1676 union ib_gid sgid; 1677 struct ib_device *device = mad_agent_priv->agent.device; 1678 u32 port_num = mad_agent_priv->agent.port_num; 1679 u8 lmc; 1680 bool has_grh; 1681 1682 send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad); 1683 rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr); 1684 1685 if (send_resp == rcv_resp) 1686 /* both requests, or both responses. GIDs different */ 1687 return 0; 1688 1689 if (rdma_query_ah(wr->send_buf.ah, &attr)) 1690 /* Assume not equal, to avoid false positives. */ 1691 return 0; 1692 1693 has_grh = !!(rdma_ah_get_ah_flags(&attr) & IB_AH_GRH); 1694 if (has_grh != !!(rwc->wc->wc_flags & IB_WC_GRH)) 1695 /* one has GID, other does not. Assume different */ 1696 return 0; 1697 1698 if (!send_resp && rcv_resp) { 1699 /* is request/response. */ 1700 if (!has_grh) { 1701 if (ib_get_cached_lmc(device, port_num, &lmc)) 1702 return 0; 1703 return (!lmc || !((rdma_ah_get_path_bits(&attr) ^ 1704 rwc->wc->dlid_path_bits) & 1705 ((1 << lmc) - 1))); 1706 } else { 1707 const struct ib_global_route *grh = 1708 rdma_ah_read_grh(&attr); 1709 1710 if (rdma_query_gid(device, port_num, 1711 grh->sgid_index, &sgid)) 1712 return 0; 1713 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw, 1714 16); 1715 } 1716 } 1717 1718 if (!has_grh) 1719 return rdma_ah_get_dlid(&attr) == rwc->wc->slid; 1720 else 1721 return !memcmp(rdma_ah_read_grh(&attr)->dgid.raw, 1722 rwc->recv_buf.grh->sgid.raw, 1723 16); 1724 } 1725 is_direct(u8 class)1726 static inline int is_direct(u8 class) 1727 { 1728 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE); 1729 } 1730 1731 struct ib_mad_send_wr_private* ib_find_send_mad(const struct ib_mad_agent_private * mad_agent_priv,const struct ib_mad_recv_wc * wc)1732 ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv, 1733 const struct ib_mad_recv_wc *wc) 1734 { 1735 struct ib_mad_send_wr_private *wr; 1736 const struct ib_mad_hdr *mad_hdr; 1737 1738 mad_hdr = &wc->recv_buf.mad->mad_hdr; 1739 1740 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) { 1741 if ((wr->tid == mad_hdr->tid) && 1742 rcv_has_same_class(wr, wc) && 1743 /* 1744 * Don't check GID for direct routed MADs. 1745 * These might have permissive LIDs. 1746 */ 1747 (is_direct(mad_hdr->mgmt_class) || 1748 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1749 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1750 } 1751 1752 /* 1753 * It's possible to receive the response before we've 1754 * been notified that the send has completed 1755 */ 1756 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) { 1757 if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) && 1758 wr->tid == mad_hdr->tid && 1759 wr->timeout && 1760 rcv_has_same_class(wr, wc) && 1761 /* 1762 * Don't check GID for direct routed MADs. 1763 * These might have permissive LIDs. 1764 */ 1765 (is_direct(mad_hdr->mgmt_class) || 1766 rcv_has_same_gid(mad_agent_priv, wr, wc))) 1767 /* Verify request has not been canceled */ 1768 return (wr->status == IB_WC_SUCCESS) ? wr : NULL; 1769 } 1770 return NULL; 1771 } 1772 ib_mark_mad_done(struct ib_mad_send_wr_private * mad_send_wr)1773 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr) 1774 { 1775 mad_send_wr->timeout = 0; 1776 if (mad_send_wr->refcount == 1) 1777 list_move_tail(&mad_send_wr->agent_list, 1778 &mad_send_wr->mad_agent_priv->done_list); 1779 } 1780 ib_mad_complete_recv(struct ib_mad_agent_private * mad_agent_priv,struct ib_mad_recv_wc * mad_recv_wc)1781 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv, 1782 struct ib_mad_recv_wc *mad_recv_wc) 1783 { 1784 struct ib_mad_send_wr_private *mad_send_wr; 1785 struct ib_mad_send_wc mad_send_wc; 1786 unsigned long flags; 1787 int ret; 1788 1789 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list); 1790 ret = ib_mad_enforce_security(mad_agent_priv, 1791 mad_recv_wc->wc->pkey_index); 1792 if (ret) { 1793 ib_free_recv_mad(mad_recv_wc); 1794 deref_mad_agent(mad_agent_priv); 1795 return; 1796 } 1797 1798 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list); 1799 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) { 1800 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv, 1801 mad_recv_wc); 1802 if (!mad_recv_wc) { 1803 deref_mad_agent(mad_agent_priv); 1804 return; 1805 } 1806 } 1807 1808 /* Complete corresponding request */ 1809 if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) { 1810 spin_lock_irqsave(&mad_agent_priv->lock, flags); 1811 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc); 1812 if (!mad_send_wr) { 1813 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1814 if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) 1815 && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class) 1816 && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr) 1817 & IB_MGMT_RMPP_FLAG_ACTIVE)) { 1818 /* user rmpp is in effect 1819 * and this is an active RMPP MAD 1820 */ 1821 mad_agent_priv->agent.recv_handler( 1822 &mad_agent_priv->agent, NULL, 1823 mad_recv_wc); 1824 deref_mad_agent(mad_agent_priv); 1825 } else { 1826 /* not user rmpp, revert to normal behavior and 1827 * drop the mad 1828 */ 1829 ib_free_recv_mad(mad_recv_wc); 1830 deref_mad_agent(mad_agent_priv); 1831 return; 1832 } 1833 } else { 1834 ib_mark_mad_done(mad_send_wr); 1835 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 1836 1837 /* Defined behavior is to complete response before request */ 1838 mad_agent_priv->agent.recv_handler( 1839 &mad_agent_priv->agent, 1840 &mad_send_wr->send_buf, 1841 mad_recv_wc); 1842 deref_mad_agent(mad_agent_priv); 1843 1844 mad_send_wc.status = IB_WC_SUCCESS; 1845 mad_send_wc.vendor_err = 0; 1846 mad_send_wc.send_buf = &mad_send_wr->send_buf; 1847 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 1848 } 1849 } else { 1850 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, NULL, 1851 mad_recv_wc); 1852 deref_mad_agent(mad_agent_priv); 1853 } 1854 } 1855 handle_ib_smi(const struct ib_mad_port_private * port_priv,const struct ib_mad_qp_info * qp_info,const struct ib_wc * wc,u32 port_num,struct ib_mad_private * recv,struct ib_mad_private * response)1856 static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv, 1857 const struct ib_mad_qp_info *qp_info, 1858 const struct ib_wc *wc, 1859 u32 port_num, 1860 struct ib_mad_private *recv, 1861 struct ib_mad_private *response) 1862 { 1863 enum smi_forward_action retsmi; 1864 struct ib_smp *smp = (struct ib_smp *)recv->mad; 1865 1866 trace_ib_mad_handle_ib_smi(smp); 1867 1868 if (smi_handle_dr_smp_recv(smp, 1869 rdma_cap_ib_switch(port_priv->device), 1870 port_num, 1871 port_priv->device->phys_port_cnt) == 1872 IB_SMI_DISCARD) 1873 return IB_SMI_DISCARD; 1874 1875 retsmi = smi_check_forward_dr_smp(smp); 1876 if (retsmi == IB_SMI_LOCAL) 1877 return IB_SMI_HANDLE; 1878 1879 if (retsmi == IB_SMI_SEND) { /* don't forward */ 1880 if (smi_handle_dr_smp_send(smp, 1881 rdma_cap_ib_switch(port_priv->device), 1882 port_num) == IB_SMI_DISCARD) 1883 return IB_SMI_DISCARD; 1884 1885 if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD) 1886 return IB_SMI_DISCARD; 1887 } else if (rdma_cap_ib_switch(port_priv->device)) { 1888 /* forward case for switches */ 1889 memcpy(response, recv, mad_priv_size(response)); 1890 response->header.recv_wc.wc = &response->header.wc; 1891 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad; 1892 response->header.recv_wc.recv_buf.grh = &response->grh; 1893 1894 agent_send_response((const struct ib_mad_hdr *)response->mad, 1895 &response->grh, wc, 1896 port_priv->device, 1897 smi_get_fwd_port(smp), 1898 qp_info->qp->qp_num, 1899 response->mad_size, 1900 false); 1901 1902 return IB_SMI_DISCARD; 1903 } 1904 return IB_SMI_HANDLE; 1905 } 1906 generate_unmatched_resp(const struct ib_mad_private * recv,struct ib_mad_private * response,size_t * resp_len,bool opa)1907 static bool generate_unmatched_resp(const struct ib_mad_private *recv, 1908 struct ib_mad_private *response, 1909 size_t *resp_len, bool opa) 1910 { 1911 const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad; 1912 struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad; 1913 1914 if (recv_hdr->method == IB_MGMT_METHOD_GET || 1915 recv_hdr->method == IB_MGMT_METHOD_SET) { 1916 memcpy(response, recv, mad_priv_size(response)); 1917 response->header.recv_wc.wc = &response->header.wc; 1918 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad; 1919 response->header.recv_wc.recv_buf.grh = &response->grh; 1920 resp_hdr->method = IB_MGMT_METHOD_GET_RESP; 1921 resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB); 1922 if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 1923 resp_hdr->status |= IB_SMP_DIRECTION; 1924 1925 if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) { 1926 if (recv_hdr->mgmt_class == 1927 IB_MGMT_CLASS_SUBN_LID_ROUTED || 1928 recv_hdr->mgmt_class == 1929 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 1930 *resp_len = opa_get_smp_header_size( 1931 (struct opa_smp *)recv->mad); 1932 else 1933 *resp_len = sizeof(struct ib_mad_hdr); 1934 } 1935 1936 return true; 1937 } else { 1938 return false; 1939 } 1940 } 1941 1942 static enum smi_action handle_opa_smi(struct ib_mad_port_private * port_priv,struct ib_mad_qp_info * qp_info,struct ib_wc * wc,u32 port_num,struct ib_mad_private * recv,struct ib_mad_private * response)1943 handle_opa_smi(struct ib_mad_port_private *port_priv, 1944 struct ib_mad_qp_info *qp_info, 1945 struct ib_wc *wc, 1946 u32 port_num, 1947 struct ib_mad_private *recv, 1948 struct ib_mad_private *response) 1949 { 1950 enum smi_forward_action retsmi; 1951 struct opa_smp *smp = (struct opa_smp *)recv->mad; 1952 1953 trace_ib_mad_handle_opa_smi(smp); 1954 1955 if (opa_smi_handle_dr_smp_recv(smp, 1956 rdma_cap_ib_switch(port_priv->device), 1957 port_num, 1958 port_priv->device->phys_port_cnt) == 1959 IB_SMI_DISCARD) 1960 return IB_SMI_DISCARD; 1961 1962 retsmi = opa_smi_check_forward_dr_smp(smp); 1963 if (retsmi == IB_SMI_LOCAL) 1964 return IB_SMI_HANDLE; 1965 1966 if (retsmi == IB_SMI_SEND) { /* don't forward */ 1967 if (opa_smi_handle_dr_smp_send(smp, 1968 rdma_cap_ib_switch(port_priv->device), 1969 port_num) == IB_SMI_DISCARD) 1970 return IB_SMI_DISCARD; 1971 1972 if (opa_smi_check_local_smp(smp, port_priv->device) == 1973 IB_SMI_DISCARD) 1974 return IB_SMI_DISCARD; 1975 1976 } else if (rdma_cap_ib_switch(port_priv->device)) { 1977 /* forward case for switches */ 1978 memcpy(response, recv, mad_priv_size(response)); 1979 response->header.recv_wc.wc = &response->header.wc; 1980 response->header.recv_wc.recv_buf.opa_mad = 1981 (struct opa_mad *)response->mad; 1982 response->header.recv_wc.recv_buf.grh = &response->grh; 1983 1984 agent_send_response((const struct ib_mad_hdr *)response->mad, 1985 &response->grh, wc, 1986 port_priv->device, 1987 opa_smi_get_fwd_port(smp), 1988 qp_info->qp->qp_num, 1989 recv->header.wc.byte_len, 1990 true); 1991 1992 return IB_SMI_DISCARD; 1993 } 1994 1995 return IB_SMI_HANDLE; 1996 } 1997 1998 static enum smi_action handle_smi(struct ib_mad_port_private * port_priv,struct ib_mad_qp_info * qp_info,struct ib_wc * wc,u32 port_num,struct ib_mad_private * recv,struct ib_mad_private * response,bool opa)1999 handle_smi(struct ib_mad_port_private *port_priv, 2000 struct ib_mad_qp_info *qp_info, 2001 struct ib_wc *wc, 2002 u32 port_num, 2003 struct ib_mad_private *recv, 2004 struct ib_mad_private *response, 2005 bool opa) 2006 { 2007 struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad; 2008 2009 if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION && 2010 mad_hdr->class_version == OPA_SM_CLASS_VERSION) 2011 return handle_opa_smi(port_priv, qp_info, wc, port_num, recv, 2012 response); 2013 2014 return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response); 2015 } 2016 ib_mad_recv_done(struct ib_cq * cq,struct ib_wc * wc)2017 static void ib_mad_recv_done(struct ib_cq *cq, struct ib_wc *wc) 2018 { 2019 struct ib_mad_port_private *port_priv = cq->cq_context; 2020 struct ib_mad_list_head *mad_list = 2021 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe); 2022 struct ib_mad_qp_info *qp_info; 2023 struct ib_mad_private_header *mad_priv_hdr; 2024 struct ib_mad_private *recv, *response = NULL; 2025 struct ib_mad_agent_private *mad_agent; 2026 u32 port_num; 2027 int ret = IB_MAD_RESULT_SUCCESS; 2028 size_t mad_size; 2029 u16 resp_mad_pkey_index = 0; 2030 bool opa; 2031 2032 if (list_empty_careful(&port_priv->port_list)) 2033 return; 2034 2035 if (wc->status != IB_WC_SUCCESS) { 2036 /* 2037 * Receive errors indicate that the QP has entered the error 2038 * state - error handling/shutdown code will cleanup 2039 */ 2040 return; 2041 } 2042 2043 qp_info = mad_list->mad_queue->qp_info; 2044 dequeue_mad(mad_list); 2045 2046 opa = rdma_cap_opa_mad(qp_info->port_priv->device, 2047 qp_info->port_priv->port_num); 2048 2049 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header, 2050 mad_list); 2051 recv = container_of(mad_priv_hdr, struct ib_mad_private, header); 2052 ib_dma_unmap_single(port_priv->device, 2053 recv->header.mapping, 2054 mad_priv_dma_size(recv), 2055 DMA_FROM_DEVICE); 2056 2057 /* Setup MAD receive work completion from "normal" work completion */ 2058 recv->header.wc = *wc; 2059 recv->header.recv_wc.wc = &recv->header.wc; 2060 2061 if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) { 2062 recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh); 2063 recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad); 2064 } else { 2065 recv->header.recv_wc.mad_len = sizeof(struct ib_mad); 2066 recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad); 2067 } 2068 2069 recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad; 2070 recv->header.recv_wc.recv_buf.grh = &recv->grh; 2071 2072 /* Validate MAD */ 2073 if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa)) 2074 goto out; 2075 2076 trace_ib_mad_recv_done_handler(qp_info, wc, 2077 (struct ib_mad_hdr *)recv->mad); 2078 2079 mad_size = recv->mad_size; 2080 response = alloc_mad_private(mad_size, GFP_KERNEL); 2081 if (!response) 2082 goto out; 2083 2084 if (rdma_cap_ib_switch(port_priv->device)) 2085 port_num = wc->port_num; 2086 else 2087 port_num = port_priv->port_num; 2088 2089 if (((struct ib_mad_hdr *)recv->mad)->mgmt_class == 2090 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 2091 if (handle_smi(port_priv, qp_info, wc, port_num, recv, 2092 response, opa) 2093 == IB_SMI_DISCARD) 2094 goto out; 2095 } 2096 2097 /* Give driver "right of first refusal" on incoming MAD */ 2098 if (port_priv->device->ops.process_mad) { 2099 ret = port_priv->device->ops.process_mad( 2100 port_priv->device, 0, port_priv->port_num, wc, 2101 &recv->grh, (const struct ib_mad *)recv->mad, 2102 (struct ib_mad *)response->mad, &mad_size, 2103 &resp_mad_pkey_index); 2104 2105 if (opa) 2106 wc->pkey_index = resp_mad_pkey_index; 2107 2108 if (ret & IB_MAD_RESULT_SUCCESS) { 2109 if (ret & IB_MAD_RESULT_CONSUMED) 2110 goto out; 2111 if (ret & IB_MAD_RESULT_REPLY) { 2112 agent_send_response((const struct ib_mad_hdr *)response->mad, 2113 &recv->grh, wc, 2114 port_priv->device, 2115 port_num, 2116 qp_info->qp->qp_num, 2117 mad_size, opa); 2118 goto out; 2119 } 2120 } 2121 } 2122 2123 mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad); 2124 if (mad_agent) { 2125 trace_ib_mad_recv_done_agent(mad_agent); 2126 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc); 2127 /* 2128 * recv is freed up in error cases in ib_mad_complete_recv 2129 * or via recv_handler in ib_mad_complete_recv() 2130 */ 2131 recv = NULL; 2132 } else if ((ret & IB_MAD_RESULT_SUCCESS) && 2133 generate_unmatched_resp(recv, response, &mad_size, opa)) { 2134 agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc, 2135 port_priv->device, port_num, 2136 qp_info->qp->qp_num, mad_size, opa); 2137 } 2138 2139 out: 2140 /* Post another receive request for this QP */ 2141 if (response) { 2142 ib_mad_post_receive_mads(qp_info, response); 2143 kfree(recv); 2144 } else 2145 ib_mad_post_receive_mads(qp_info, recv); 2146 } 2147 adjust_timeout(struct ib_mad_agent_private * mad_agent_priv)2148 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv) 2149 { 2150 struct ib_mad_send_wr_private *mad_send_wr; 2151 unsigned long delay; 2152 2153 if (list_empty(&mad_agent_priv->wait_list)) { 2154 cancel_delayed_work(&mad_agent_priv->timed_work); 2155 } else { 2156 mad_send_wr = list_entry(mad_agent_priv->wait_list.next, 2157 struct ib_mad_send_wr_private, 2158 agent_list); 2159 2160 if (time_after(mad_agent_priv->timeout, 2161 mad_send_wr->timeout)) { 2162 mad_agent_priv->timeout = mad_send_wr->timeout; 2163 delay = mad_send_wr->timeout - jiffies; 2164 if ((long)delay <= 0) 2165 delay = 1; 2166 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq, 2167 &mad_agent_priv->timed_work, delay); 2168 } 2169 } 2170 } 2171 wait_for_response(struct ib_mad_send_wr_private * mad_send_wr)2172 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr) 2173 { 2174 struct ib_mad_agent_private *mad_agent_priv; 2175 struct ib_mad_send_wr_private *temp_mad_send_wr; 2176 struct list_head *list_item; 2177 unsigned long delay; 2178 2179 mad_agent_priv = mad_send_wr->mad_agent_priv; 2180 list_del(&mad_send_wr->agent_list); 2181 2182 delay = mad_send_wr->timeout; 2183 mad_send_wr->timeout += jiffies; 2184 2185 if (delay) { 2186 list_for_each_prev(list_item, &mad_agent_priv->wait_list) { 2187 temp_mad_send_wr = list_entry(list_item, 2188 struct ib_mad_send_wr_private, 2189 agent_list); 2190 if (time_after(mad_send_wr->timeout, 2191 temp_mad_send_wr->timeout)) 2192 break; 2193 } 2194 } else { 2195 list_item = &mad_agent_priv->wait_list; 2196 } 2197 2198 list_add(&mad_send_wr->agent_list, list_item); 2199 2200 /* Reschedule a work item if we have a shorter timeout */ 2201 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) 2202 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq, 2203 &mad_agent_priv->timed_work, delay); 2204 } 2205 ib_reset_mad_timeout(struct ib_mad_send_wr_private * mad_send_wr,unsigned long timeout_ms)2206 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr, 2207 unsigned long timeout_ms) 2208 { 2209 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2210 wait_for_response(mad_send_wr); 2211 } 2212 2213 /* 2214 * Process a send work completion 2215 */ ib_mad_complete_send_wr(struct ib_mad_send_wr_private * mad_send_wr,struct ib_mad_send_wc * mad_send_wc)2216 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr, 2217 struct ib_mad_send_wc *mad_send_wc) 2218 { 2219 struct ib_mad_agent_private *mad_agent_priv; 2220 unsigned long flags; 2221 int ret; 2222 2223 mad_agent_priv = mad_send_wr->mad_agent_priv; 2224 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2225 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) { 2226 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc); 2227 if (ret == IB_RMPP_RESULT_CONSUMED) 2228 goto done; 2229 } else 2230 ret = IB_RMPP_RESULT_UNHANDLED; 2231 2232 if (mad_send_wc->status != IB_WC_SUCCESS && 2233 mad_send_wr->status == IB_WC_SUCCESS) { 2234 mad_send_wr->status = mad_send_wc->status; 2235 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2236 } 2237 2238 if (--mad_send_wr->refcount > 0) { 2239 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout && 2240 mad_send_wr->status == IB_WC_SUCCESS) { 2241 wait_for_response(mad_send_wr); 2242 } 2243 goto done; 2244 } 2245 2246 /* Remove send from MAD agent and notify client of completion */ 2247 list_del(&mad_send_wr->agent_list); 2248 adjust_timeout(mad_agent_priv); 2249 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2250 2251 if (mad_send_wr->status != IB_WC_SUCCESS) 2252 mad_send_wc->status = mad_send_wr->status; 2253 if (ret == IB_RMPP_RESULT_INTERNAL) 2254 ib_rmpp_send_handler(mad_send_wc); 2255 else 2256 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2257 mad_send_wc); 2258 2259 /* Release reference on agent taken when sending */ 2260 deref_mad_agent(mad_agent_priv); 2261 return; 2262 done: 2263 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2264 } 2265 ib_mad_send_done(struct ib_cq * cq,struct ib_wc * wc)2266 static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc) 2267 { 2268 struct ib_mad_port_private *port_priv = cq->cq_context; 2269 struct ib_mad_list_head *mad_list = 2270 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe); 2271 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr; 2272 struct ib_mad_qp_info *qp_info; 2273 struct ib_mad_queue *send_queue; 2274 struct ib_mad_send_wc mad_send_wc; 2275 unsigned long flags; 2276 int ret; 2277 2278 if (list_empty_careful(&port_priv->port_list)) 2279 return; 2280 2281 if (wc->status != IB_WC_SUCCESS) { 2282 if (!ib_mad_send_error(port_priv, wc)) 2283 return; 2284 } 2285 2286 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2287 mad_list); 2288 send_queue = mad_list->mad_queue; 2289 qp_info = send_queue->qp_info; 2290 2291 trace_ib_mad_send_done_agent(mad_send_wr->mad_agent_priv); 2292 trace_ib_mad_send_done_handler(mad_send_wr, wc); 2293 2294 retry: 2295 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2296 mad_send_wr->header_mapping, 2297 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE); 2298 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device, 2299 mad_send_wr->payload_mapping, 2300 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE); 2301 queued_send_wr = NULL; 2302 spin_lock_irqsave(&send_queue->lock, flags); 2303 list_del(&mad_list->list); 2304 2305 /* Move queued send to the send queue */ 2306 if (send_queue->count-- > send_queue->max_active) { 2307 mad_list = container_of(qp_info->overflow_list.next, 2308 struct ib_mad_list_head, list); 2309 queued_send_wr = container_of(mad_list, 2310 struct ib_mad_send_wr_private, 2311 mad_list); 2312 list_move_tail(&mad_list->list, &send_queue->list); 2313 } 2314 spin_unlock_irqrestore(&send_queue->lock, flags); 2315 2316 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2317 mad_send_wc.status = wc->status; 2318 mad_send_wc.vendor_err = wc->vendor_err; 2319 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); 2320 2321 if (queued_send_wr) { 2322 trace_ib_mad_send_done_resend(queued_send_wr, qp_info); 2323 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr.wr, 2324 NULL); 2325 if (ret) { 2326 dev_err(&port_priv->device->dev, 2327 "ib_post_send failed: %d\n", ret); 2328 mad_send_wr = queued_send_wr; 2329 wc->status = IB_WC_LOC_QP_OP_ERR; 2330 goto retry; 2331 } 2332 } 2333 } 2334 mark_sends_for_retry(struct ib_mad_qp_info * qp_info)2335 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info) 2336 { 2337 struct ib_mad_send_wr_private *mad_send_wr; 2338 struct ib_mad_list_head *mad_list; 2339 unsigned long flags; 2340 2341 spin_lock_irqsave(&qp_info->send_queue.lock, flags); 2342 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) { 2343 mad_send_wr = container_of(mad_list, 2344 struct ib_mad_send_wr_private, 2345 mad_list); 2346 mad_send_wr->retry = 1; 2347 } 2348 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); 2349 } 2350 ib_mad_send_error(struct ib_mad_port_private * port_priv,struct ib_wc * wc)2351 static bool ib_mad_send_error(struct ib_mad_port_private *port_priv, 2352 struct ib_wc *wc) 2353 { 2354 struct ib_mad_list_head *mad_list = 2355 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe); 2356 struct ib_mad_qp_info *qp_info = mad_list->mad_queue->qp_info; 2357 struct ib_mad_send_wr_private *mad_send_wr; 2358 int ret; 2359 2360 /* 2361 * Send errors will transition the QP to SQE - move 2362 * QP to RTS and repost flushed work requests 2363 */ 2364 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, 2365 mad_list); 2366 if (wc->status == IB_WC_WR_FLUSH_ERR) { 2367 if (mad_send_wr->retry) { 2368 /* Repost send */ 2369 mad_send_wr->retry = 0; 2370 trace_ib_mad_error_handler(mad_send_wr, qp_info); 2371 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr, 2372 NULL); 2373 if (!ret) 2374 return false; 2375 } 2376 } else { 2377 struct ib_qp_attr *attr; 2378 2379 /* Transition QP to RTS and fail offending send */ 2380 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2381 if (attr) { 2382 attr->qp_state = IB_QPS_RTS; 2383 attr->cur_qp_state = IB_QPS_SQE; 2384 ret = ib_modify_qp(qp_info->qp, attr, 2385 IB_QP_STATE | IB_QP_CUR_STATE); 2386 kfree(attr); 2387 if (ret) 2388 dev_err(&port_priv->device->dev, 2389 "%s - ib_modify_qp to RTS: %d\n", 2390 __func__, ret); 2391 else 2392 mark_sends_for_retry(qp_info); 2393 } 2394 } 2395 2396 return true; 2397 } 2398 cancel_mads(struct ib_mad_agent_private * mad_agent_priv)2399 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv) 2400 { 2401 unsigned long flags; 2402 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr; 2403 struct ib_mad_send_wc mad_send_wc; 2404 struct list_head cancel_list; 2405 2406 INIT_LIST_HEAD(&cancel_list); 2407 2408 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2409 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2410 &mad_agent_priv->send_list, agent_list) { 2411 if (mad_send_wr->status == IB_WC_SUCCESS) { 2412 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2413 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2414 } 2415 } 2416 2417 /* Empty wait list to prevent receives from finding a request */ 2418 list_splice_init(&mad_agent_priv->wait_list, &cancel_list); 2419 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2420 2421 /* Report all cancelled requests */ 2422 mad_send_wc.status = IB_WC_WR_FLUSH_ERR; 2423 mad_send_wc.vendor_err = 0; 2424 2425 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, 2426 &cancel_list, agent_list) { 2427 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2428 list_del(&mad_send_wr->agent_list); 2429 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2430 &mad_send_wc); 2431 deref_mad_agent(mad_agent_priv); 2432 } 2433 } 2434 2435 static struct ib_mad_send_wr_private* find_send_wr(struct ib_mad_agent_private * mad_agent_priv,struct ib_mad_send_buf * send_buf)2436 find_send_wr(struct ib_mad_agent_private *mad_agent_priv, 2437 struct ib_mad_send_buf *send_buf) 2438 { 2439 struct ib_mad_send_wr_private *mad_send_wr; 2440 2441 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list, 2442 agent_list) { 2443 if (&mad_send_wr->send_buf == send_buf) 2444 return mad_send_wr; 2445 } 2446 2447 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list, 2448 agent_list) { 2449 if (is_rmpp_data_mad(mad_agent_priv, 2450 mad_send_wr->send_buf.mad) && 2451 &mad_send_wr->send_buf == send_buf) 2452 return mad_send_wr; 2453 } 2454 return NULL; 2455 } 2456 ib_modify_mad(struct ib_mad_send_buf * send_buf,u32 timeout_ms)2457 int ib_modify_mad(struct ib_mad_send_buf *send_buf, u32 timeout_ms) 2458 { 2459 struct ib_mad_agent_private *mad_agent_priv; 2460 struct ib_mad_send_wr_private *mad_send_wr; 2461 unsigned long flags; 2462 int active; 2463 2464 if (!send_buf) 2465 return -EINVAL; 2466 2467 mad_agent_priv = container_of(send_buf->mad_agent, 2468 struct ib_mad_agent_private, agent); 2469 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2470 mad_send_wr = find_send_wr(mad_agent_priv, send_buf); 2471 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) { 2472 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2473 return -EINVAL; 2474 } 2475 2476 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1); 2477 if (!timeout_ms) { 2478 mad_send_wr->status = IB_WC_WR_FLUSH_ERR; 2479 mad_send_wr->refcount -= (mad_send_wr->timeout > 0); 2480 } 2481 2482 mad_send_wr->send_buf.timeout_ms = timeout_ms; 2483 if (active) 2484 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); 2485 else 2486 ib_reset_mad_timeout(mad_send_wr, timeout_ms); 2487 2488 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2489 return 0; 2490 } 2491 EXPORT_SYMBOL(ib_modify_mad); 2492 local_completions(struct work_struct * work)2493 static void local_completions(struct work_struct *work) 2494 { 2495 struct ib_mad_agent_private *mad_agent_priv; 2496 struct ib_mad_local_private *local; 2497 struct ib_mad_agent_private *recv_mad_agent; 2498 unsigned long flags; 2499 int free_mad; 2500 struct ib_wc wc; 2501 struct ib_mad_send_wc mad_send_wc; 2502 bool opa; 2503 2504 mad_agent_priv = 2505 container_of(work, struct ib_mad_agent_private, local_work); 2506 2507 opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device, 2508 mad_agent_priv->qp_info->port_priv->port_num); 2509 2510 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2511 while (!list_empty(&mad_agent_priv->local_list)) { 2512 local = list_entry(mad_agent_priv->local_list.next, 2513 struct ib_mad_local_private, 2514 completion_list); 2515 list_del(&local->completion_list); 2516 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2517 free_mad = 0; 2518 if (local->mad_priv) { 2519 u8 base_version; 2520 recv_mad_agent = local->recv_mad_agent; 2521 if (!recv_mad_agent) { 2522 dev_err(&mad_agent_priv->agent.device->dev, 2523 "No receive MAD agent for local completion\n"); 2524 free_mad = 1; 2525 goto local_send_completion; 2526 } 2527 2528 /* 2529 * Defined behavior is to complete response 2530 * before request 2531 */ 2532 build_smp_wc(recv_mad_agent->agent.qp, 2533 local->mad_send_wr->send_wr.wr.wr_cqe, 2534 be16_to_cpu(IB_LID_PERMISSIVE), 2535 local->mad_send_wr->send_wr.pkey_index, 2536 recv_mad_agent->agent.port_num, &wc); 2537 2538 local->mad_priv->header.recv_wc.wc = &wc; 2539 2540 base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version; 2541 if (opa && base_version == OPA_MGMT_BASE_VERSION) { 2542 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len; 2543 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad); 2544 } else { 2545 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad); 2546 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad); 2547 } 2548 2549 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list); 2550 list_add(&local->mad_priv->header.recv_wc.recv_buf.list, 2551 &local->mad_priv->header.recv_wc.rmpp_list); 2552 local->mad_priv->header.recv_wc.recv_buf.grh = NULL; 2553 local->mad_priv->header.recv_wc.recv_buf.mad = 2554 (struct ib_mad *)local->mad_priv->mad; 2555 recv_mad_agent->agent.recv_handler( 2556 &recv_mad_agent->agent, 2557 &local->mad_send_wr->send_buf, 2558 &local->mad_priv->header.recv_wc); 2559 spin_lock_irqsave(&recv_mad_agent->lock, flags); 2560 deref_mad_agent(recv_mad_agent); 2561 spin_unlock_irqrestore(&recv_mad_agent->lock, flags); 2562 } 2563 2564 local_send_completion: 2565 /* Complete send */ 2566 mad_send_wc.status = IB_WC_SUCCESS; 2567 mad_send_wc.vendor_err = 0; 2568 mad_send_wc.send_buf = &local->mad_send_wr->send_buf; 2569 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2570 &mad_send_wc); 2571 2572 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2573 deref_mad_agent(mad_agent_priv); 2574 if (free_mad) 2575 kfree(local->mad_priv); 2576 kfree(local); 2577 } 2578 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2579 } 2580 retry_send(struct ib_mad_send_wr_private * mad_send_wr)2581 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr) 2582 { 2583 int ret; 2584 2585 if (!mad_send_wr->retries_left) 2586 return -ETIMEDOUT; 2587 2588 mad_send_wr->retries_left--; 2589 mad_send_wr->send_buf.retries++; 2590 2591 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms); 2592 2593 if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) { 2594 ret = ib_retry_rmpp(mad_send_wr); 2595 switch (ret) { 2596 case IB_RMPP_RESULT_UNHANDLED: 2597 ret = ib_send_mad(mad_send_wr); 2598 break; 2599 case IB_RMPP_RESULT_CONSUMED: 2600 ret = 0; 2601 break; 2602 default: 2603 ret = -ECOMM; 2604 break; 2605 } 2606 } else 2607 ret = ib_send_mad(mad_send_wr); 2608 2609 if (!ret) { 2610 mad_send_wr->refcount++; 2611 list_add_tail(&mad_send_wr->agent_list, 2612 &mad_send_wr->mad_agent_priv->send_list); 2613 } 2614 return ret; 2615 } 2616 timeout_sends(struct work_struct * work)2617 static void timeout_sends(struct work_struct *work) 2618 { 2619 struct ib_mad_send_wr_private *mad_send_wr, *n; 2620 struct ib_mad_agent_private *mad_agent_priv; 2621 struct ib_mad_send_wc mad_send_wc; 2622 struct list_head local_list; 2623 unsigned long flags, delay; 2624 2625 mad_agent_priv = container_of(work, struct ib_mad_agent_private, 2626 timed_work.work); 2627 mad_send_wc.vendor_err = 0; 2628 INIT_LIST_HEAD(&local_list); 2629 2630 spin_lock_irqsave(&mad_agent_priv->lock, flags); 2631 while (!list_empty(&mad_agent_priv->wait_list)) { 2632 mad_send_wr = list_entry(mad_agent_priv->wait_list.next, 2633 struct ib_mad_send_wr_private, 2634 agent_list); 2635 2636 if (time_after(mad_send_wr->timeout, jiffies)) { 2637 delay = mad_send_wr->timeout - jiffies; 2638 if ((long)delay <= 0) 2639 delay = 1; 2640 queue_delayed_work(mad_agent_priv->qp_info-> 2641 port_priv->wq, 2642 &mad_agent_priv->timed_work, delay); 2643 break; 2644 } 2645 2646 list_del_init(&mad_send_wr->agent_list); 2647 if (mad_send_wr->status == IB_WC_SUCCESS && 2648 !retry_send(mad_send_wr)) 2649 continue; 2650 2651 list_add_tail(&mad_send_wr->agent_list, &local_list); 2652 } 2653 spin_unlock_irqrestore(&mad_agent_priv->lock, flags); 2654 2655 list_for_each_entry_safe(mad_send_wr, n, &local_list, agent_list) { 2656 if (mad_send_wr->status == IB_WC_SUCCESS) 2657 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR; 2658 else 2659 mad_send_wc.status = mad_send_wr->status; 2660 mad_send_wc.send_buf = &mad_send_wr->send_buf; 2661 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, 2662 &mad_send_wc); 2663 deref_mad_agent(mad_agent_priv); 2664 } 2665 } 2666 2667 /* 2668 * Allocate receive MADs and post receive WRs for them 2669 */ ib_mad_post_receive_mads(struct ib_mad_qp_info * qp_info,struct ib_mad_private * mad)2670 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info, 2671 struct ib_mad_private *mad) 2672 { 2673 unsigned long flags; 2674 int post, ret; 2675 struct ib_mad_private *mad_priv; 2676 struct ib_sge sg_list; 2677 struct ib_recv_wr recv_wr; 2678 struct ib_mad_queue *recv_queue = &qp_info->recv_queue; 2679 2680 /* Initialize common scatter list fields */ 2681 sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey; 2682 2683 /* Initialize common receive WR fields */ 2684 recv_wr.next = NULL; 2685 recv_wr.sg_list = &sg_list; 2686 recv_wr.num_sge = 1; 2687 2688 do { 2689 /* Allocate and map receive buffer */ 2690 if (mad) { 2691 mad_priv = mad; 2692 mad = NULL; 2693 } else { 2694 mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv), 2695 GFP_ATOMIC); 2696 if (!mad_priv) { 2697 ret = -ENOMEM; 2698 break; 2699 } 2700 } 2701 sg_list.length = mad_priv_dma_size(mad_priv); 2702 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device, 2703 &mad_priv->grh, 2704 mad_priv_dma_size(mad_priv), 2705 DMA_FROM_DEVICE); 2706 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device, 2707 sg_list.addr))) { 2708 kfree(mad_priv); 2709 ret = -ENOMEM; 2710 break; 2711 } 2712 mad_priv->header.mapping = sg_list.addr; 2713 mad_priv->header.mad_list.mad_queue = recv_queue; 2714 mad_priv->header.mad_list.cqe.done = ib_mad_recv_done; 2715 recv_wr.wr_cqe = &mad_priv->header.mad_list.cqe; 2716 2717 /* Post receive WR */ 2718 spin_lock_irqsave(&recv_queue->lock, flags); 2719 post = (++recv_queue->count < recv_queue->max_active); 2720 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list); 2721 spin_unlock_irqrestore(&recv_queue->lock, flags); 2722 ret = ib_post_recv(qp_info->qp, &recv_wr, NULL); 2723 if (ret) { 2724 spin_lock_irqsave(&recv_queue->lock, flags); 2725 list_del(&mad_priv->header.mad_list.list); 2726 recv_queue->count--; 2727 spin_unlock_irqrestore(&recv_queue->lock, flags); 2728 ib_dma_unmap_single(qp_info->port_priv->device, 2729 mad_priv->header.mapping, 2730 mad_priv_dma_size(mad_priv), 2731 DMA_FROM_DEVICE); 2732 kfree(mad_priv); 2733 dev_err(&qp_info->port_priv->device->dev, 2734 "ib_post_recv failed: %d\n", ret); 2735 break; 2736 } 2737 } while (post); 2738 2739 return ret; 2740 } 2741 2742 /* 2743 * Return all the posted receive MADs 2744 */ cleanup_recv_queue(struct ib_mad_qp_info * qp_info)2745 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info) 2746 { 2747 struct ib_mad_private_header *mad_priv_hdr; 2748 struct ib_mad_private *recv; 2749 struct ib_mad_list_head *mad_list; 2750 2751 if (!qp_info->qp) 2752 return; 2753 2754 while (!list_empty(&qp_info->recv_queue.list)) { 2755 2756 mad_list = list_entry(qp_info->recv_queue.list.next, 2757 struct ib_mad_list_head, list); 2758 mad_priv_hdr = container_of(mad_list, 2759 struct ib_mad_private_header, 2760 mad_list); 2761 recv = container_of(mad_priv_hdr, struct ib_mad_private, 2762 header); 2763 2764 /* Remove from posted receive MAD list */ 2765 list_del(&mad_list->list); 2766 2767 ib_dma_unmap_single(qp_info->port_priv->device, 2768 recv->header.mapping, 2769 mad_priv_dma_size(recv), 2770 DMA_FROM_DEVICE); 2771 kfree(recv); 2772 } 2773 2774 qp_info->recv_queue.count = 0; 2775 } 2776 2777 /* 2778 * Start the port 2779 */ ib_mad_port_start(struct ib_mad_port_private * port_priv)2780 static int ib_mad_port_start(struct ib_mad_port_private *port_priv) 2781 { 2782 int ret, i; 2783 struct ib_qp_attr *attr; 2784 struct ib_qp *qp; 2785 u16 pkey_index; 2786 2787 attr = kmalloc(sizeof *attr, GFP_KERNEL); 2788 if (!attr) 2789 return -ENOMEM; 2790 2791 ret = ib_find_pkey(port_priv->device, port_priv->port_num, 2792 IB_DEFAULT_PKEY_FULL, &pkey_index); 2793 if (ret) 2794 pkey_index = 0; 2795 2796 for (i = 0; i < IB_MAD_QPS_CORE; i++) { 2797 qp = port_priv->qp_info[i].qp; 2798 if (!qp) 2799 continue; 2800 2801 /* 2802 * PKey index for QP1 is irrelevant but 2803 * one is needed for the Reset to Init transition 2804 */ 2805 attr->qp_state = IB_QPS_INIT; 2806 attr->pkey_index = pkey_index; 2807 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY; 2808 ret = ib_modify_qp(qp, attr, IB_QP_STATE | 2809 IB_QP_PKEY_INDEX | IB_QP_QKEY); 2810 if (ret) { 2811 dev_err(&port_priv->device->dev, 2812 "Couldn't change QP%d state to INIT: %d\n", 2813 i, ret); 2814 goto out; 2815 } 2816 2817 attr->qp_state = IB_QPS_RTR; 2818 ret = ib_modify_qp(qp, attr, IB_QP_STATE); 2819 if (ret) { 2820 dev_err(&port_priv->device->dev, 2821 "Couldn't change QP%d state to RTR: %d\n", 2822 i, ret); 2823 goto out; 2824 } 2825 2826 attr->qp_state = IB_QPS_RTS; 2827 attr->sq_psn = IB_MAD_SEND_Q_PSN; 2828 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN); 2829 if (ret) { 2830 dev_err(&port_priv->device->dev, 2831 "Couldn't change QP%d state to RTS: %d\n", 2832 i, ret); 2833 goto out; 2834 } 2835 } 2836 2837 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); 2838 if (ret) { 2839 dev_err(&port_priv->device->dev, 2840 "Failed to request completion notification: %d\n", 2841 ret); 2842 goto out; 2843 } 2844 2845 for (i = 0; i < IB_MAD_QPS_CORE; i++) { 2846 if (!port_priv->qp_info[i].qp) 2847 continue; 2848 2849 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL); 2850 if (ret) { 2851 dev_err(&port_priv->device->dev, 2852 "Couldn't post receive WRs\n"); 2853 goto out; 2854 } 2855 } 2856 out: 2857 kfree(attr); 2858 return ret; 2859 } 2860 qp_event_handler(struct ib_event * event,void * qp_context)2861 static void qp_event_handler(struct ib_event *event, void *qp_context) 2862 { 2863 struct ib_mad_qp_info *qp_info = qp_context; 2864 2865 /* It's worse than that! He's dead, Jim! */ 2866 dev_err(&qp_info->port_priv->device->dev, 2867 "Fatal error (%d) on MAD QP (%u)\n", 2868 event->event, qp_info->qp->qp_num); 2869 } 2870 init_mad_queue(struct ib_mad_qp_info * qp_info,struct ib_mad_queue * mad_queue)2871 static void init_mad_queue(struct ib_mad_qp_info *qp_info, 2872 struct ib_mad_queue *mad_queue) 2873 { 2874 mad_queue->qp_info = qp_info; 2875 mad_queue->count = 0; 2876 spin_lock_init(&mad_queue->lock); 2877 INIT_LIST_HEAD(&mad_queue->list); 2878 } 2879 init_mad_qp(struct ib_mad_port_private * port_priv,struct ib_mad_qp_info * qp_info)2880 static void init_mad_qp(struct ib_mad_port_private *port_priv, 2881 struct ib_mad_qp_info *qp_info) 2882 { 2883 qp_info->port_priv = port_priv; 2884 init_mad_queue(qp_info, &qp_info->send_queue); 2885 init_mad_queue(qp_info, &qp_info->recv_queue); 2886 INIT_LIST_HEAD(&qp_info->overflow_list); 2887 } 2888 create_mad_qp(struct ib_mad_qp_info * qp_info,enum ib_qp_type qp_type)2889 static int create_mad_qp(struct ib_mad_qp_info *qp_info, 2890 enum ib_qp_type qp_type) 2891 { 2892 struct ib_qp_init_attr qp_init_attr; 2893 int ret; 2894 2895 memset(&qp_init_attr, 0, sizeof qp_init_attr); 2896 qp_init_attr.send_cq = qp_info->port_priv->cq; 2897 qp_init_attr.recv_cq = qp_info->port_priv->cq; 2898 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR; 2899 qp_init_attr.cap.max_send_wr = mad_sendq_size; 2900 qp_init_attr.cap.max_recv_wr = mad_recvq_size; 2901 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG; 2902 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG; 2903 qp_init_attr.qp_type = qp_type; 2904 qp_init_attr.port_num = qp_info->port_priv->port_num; 2905 qp_init_attr.qp_context = qp_info; 2906 qp_init_attr.event_handler = qp_event_handler; 2907 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr); 2908 if (IS_ERR(qp_info->qp)) { 2909 dev_err(&qp_info->port_priv->device->dev, 2910 "Couldn't create ib_mad QP%d\n", 2911 get_spl_qp_index(qp_type)); 2912 ret = PTR_ERR(qp_info->qp); 2913 goto error; 2914 } 2915 /* Use minimum queue sizes unless the CQ is resized */ 2916 qp_info->send_queue.max_active = mad_sendq_size; 2917 qp_info->recv_queue.max_active = mad_recvq_size; 2918 return 0; 2919 2920 error: 2921 return ret; 2922 } 2923 destroy_mad_qp(struct ib_mad_qp_info * qp_info)2924 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info) 2925 { 2926 if (!qp_info->qp) 2927 return; 2928 2929 ib_destroy_qp(qp_info->qp); 2930 } 2931 2932 /* 2933 * Open the port 2934 * Create the QP, PD, MR, and CQ if needed 2935 */ ib_mad_port_open(struct ib_device * device,u32 port_num)2936 static int ib_mad_port_open(struct ib_device *device, 2937 u32 port_num) 2938 { 2939 int ret, cq_size; 2940 struct ib_mad_port_private *port_priv; 2941 unsigned long flags; 2942 int has_smi; 2943 2944 if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE)) 2945 return -EFAULT; 2946 2947 if (WARN_ON(rdma_cap_opa_mad(device, port_num) && 2948 rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE)) 2949 return -EFAULT; 2950 2951 /* Create new device info */ 2952 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL); 2953 if (!port_priv) 2954 return -ENOMEM; 2955 2956 port_priv->device = device; 2957 port_priv->port_num = port_num; 2958 spin_lock_init(&port_priv->reg_lock); 2959 init_mad_qp(port_priv, &port_priv->qp_info[0]); 2960 init_mad_qp(port_priv, &port_priv->qp_info[1]); 2961 2962 cq_size = mad_sendq_size + mad_recvq_size; 2963 has_smi = rdma_cap_ib_smi(device, port_num); 2964 if (has_smi) 2965 cq_size *= 2; 2966 2967 port_priv->pd = ib_alloc_pd(device, 0); 2968 if (IS_ERR(port_priv->pd)) { 2969 dev_err(&device->dev, "Couldn't create ib_mad PD\n"); 2970 ret = PTR_ERR(port_priv->pd); 2971 goto error3; 2972 } 2973 2974 port_priv->cq = ib_alloc_cq(port_priv->device, port_priv, cq_size, 0, 2975 IB_POLL_UNBOUND_WORKQUEUE); 2976 if (IS_ERR(port_priv->cq)) { 2977 dev_err(&device->dev, "Couldn't create ib_mad CQ\n"); 2978 ret = PTR_ERR(port_priv->cq); 2979 goto error4; 2980 } 2981 2982 if (has_smi) { 2983 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI); 2984 if (ret) 2985 goto error6; 2986 } 2987 2988 if (rdma_cap_ib_cm(device, port_num)) { 2989 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI); 2990 if (ret) 2991 goto error7; 2992 } 2993 2994 port_priv->wq = alloc_ordered_workqueue("ib_mad%u", WQ_MEM_RECLAIM, 2995 port_num); 2996 if (!port_priv->wq) { 2997 ret = -ENOMEM; 2998 goto error8; 2999 } 3000 3001 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 3002 list_add_tail(&port_priv->port_list, &ib_mad_port_list); 3003 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 3004 3005 ret = ib_mad_port_start(port_priv); 3006 if (ret) { 3007 dev_err(&device->dev, "Couldn't start port\n"); 3008 goto error9; 3009 } 3010 3011 return 0; 3012 3013 error9: 3014 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 3015 list_del_init(&port_priv->port_list); 3016 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 3017 3018 destroy_workqueue(port_priv->wq); 3019 error8: 3020 destroy_mad_qp(&port_priv->qp_info[1]); 3021 error7: 3022 destroy_mad_qp(&port_priv->qp_info[0]); 3023 error6: 3024 ib_free_cq(port_priv->cq); 3025 cleanup_recv_queue(&port_priv->qp_info[1]); 3026 cleanup_recv_queue(&port_priv->qp_info[0]); 3027 error4: 3028 ib_dealloc_pd(port_priv->pd); 3029 error3: 3030 kfree(port_priv); 3031 3032 return ret; 3033 } 3034 3035 /* 3036 * Close the port 3037 * If there are no classes using the port, free the port 3038 * resources (CQ, MR, PD, QP) and remove the port's info structure 3039 */ ib_mad_port_close(struct ib_device * device,u32 port_num)3040 static int ib_mad_port_close(struct ib_device *device, u32 port_num) 3041 { 3042 struct ib_mad_port_private *port_priv; 3043 unsigned long flags; 3044 3045 spin_lock_irqsave(&ib_mad_port_list_lock, flags); 3046 port_priv = __ib_get_mad_port(device, port_num); 3047 if (port_priv == NULL) { 3048 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 3049 dev_err(&device->dev, "Port %u not found\n", port_num); 3050 return -ENODEV; 3051 } 3052 list_del_init(&port_priv->port_list); 3053 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); 3054 3055 destroy_workqueue(port_priv->wq); 3056 destroy_mad_qp(&port_priv->qp_info[1]); 3057 destroy_mad_qp(&port_priv->qp_info[0]); 3058 ib_free_cq(port_priv->cq); 3059 ib_dealloc_pd(port_priv->pd); 3060 cleanup_recv_queue(&port_priv->qp_info[1]); 3061 cleanup_recv_queue(&port_priv->qp_info[0]); 3062 /* XXX: Handle deallocation of MAD registration tables */ 3063 3064 kfree(port_priv); 3065 3066 return 0; 3067 } 3068 ib_mad_init_device(struct ib_device * device)3069 static int ib_mad_init_device(struct ib_device *device) 3070 { 3071 int start, i; 3072 unsigned int count = 0; 3073 int ret; 3074 3075 start = rdma_start_port(device); 3076 3077 for (i = start; i <= rdma_end_port(device); i++) { 3078 if (!rdma_cap_ib_mad(device, i)) 3079 continue; 3080 3081 ret = ib_mad_port_open(device, i); 3082 if (ret) { 3083 dev_err(&device->dev, "Couldn't open port %d\n", i); 3084 goto error; 3085 } 3086 ret = ib_agent_port_open(device, i); 3087 if (ret) { 3088 dev_err(&device->dev, 3089 "Couldn't open port %d for agents\n", i); 3090 goto error_agent; 3091 } 3092 count++; 3093 } 3094 if (!count) 3095 return -EOPNOTSUPP; 3096 3097 return 0; 3098 3099 error_agent: 3100 if (ib_mad_port_close(device, i)) 3101 dev_err(&device->dev, "Couldn't close port %d\n", i); 3102 3103 error: 3104 while (--i >= start) { 3105 if (!rdma_cap_ib_mad(device, i)) 3106 continue; 3107 3108 if (ib_agent_port_close(device, i)) 3109 dev_err(&device->dev, 3110 "Couldn't close port %d for agents\n", i); 3111 if (ib_mad_port_close(device, i)) 3112 dev_err(&device->dev, "Couldn't close port %d\n", i); 3113 } 3114 return ret; 3115 } 3116 ib_mad_remove_device(struct ib_device * device,void * client_data)3117 static void ib_mad_remove_device(struct ib_device *device, void *client_data) 3118 { 3119 unsigned int i; 3120 3121 rdma_for_each_port (device, i) { 3122 if (!rdma_cap_ib_mad(device, i)) 3123 continue; 3124 3125 if (ib_agent_port_close(device, i)) 3126 dev_err(&device->dev, 3127 "Couldn't close port %u for agents\n", i); 3128 if (ib_mad_port_close(device, i)) 3129 dev_err(&device->dev, "Couldn't close port %u\n", i); 3130 } 3131 } 3132 3133 static struct ib_client mad_client = { 3134 .name = "mad", 3135 .add = ib_mad_init_device, 3136 .remove = ib_mad_remove_device 3137 }; 3138 ib_mad_init(void)3139 int ib_mad_init(void) 3140 { 3141 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE); 3142 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE); 3143 3144 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE); 3145 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE); 3146 3147 INIT_LIST_HEAD(&ib_mad_port_list); 3148 3149 if (ib_register_client(&mad_client)) { 3150 pr_err("Couldn't register ib_mad client\n"); 3151 return -EINVAL; 3152 } 3153 3154 return 0; 3155 } 3156 ib_mad_cleanup(void)3157 void ib_mad_cleanup(void) 3158 { 3159 ib_unregister_client(&mad_client); 3160 } 3161