1 /* 2 * Copyright (c) 2005 Intel Inc. All rights reserved. 3 * Copyright (c) 2005-2006 Voltaire, Inc. All rights reserved. 4 * Copyright (c) 2014 Intel Corporation. All rights reserved. 5 * 6 * This software is available to you under a choice of one of two 7 * licenses. You may choose to be licensed under the terms of the GNU 8 * General Public License (GPL) Version 2, available from the file 9 * COPYING in the main directory of this source tree, or the 10 * OpenIB.org BSD license below: 11 * 12 * Redistribution and use in source and binary forms, with or 13 * without modification, are permitted provided that the following 14 * conditions are met: 15 * 16 * - Redistributions of source code must retain the above 17 * copyright notice, this list of conditions and the following 18 * disclaimer. 19 * 20 * - Redistributions in binary form must reproduce the above 21 * copyright notice, this list of conditions and the following 22 * disclaimer in the documentation and/or other materials 23 * provided with the distribution. 24 * 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 32 * SOFTWARE. 33 */ 34 35 #include <linux/slab.h> 36 37 #include "mad_priv.h" 38 #include "mad_rmpp.h" 39 40 enum rmpp_state { 41 RMPP_STATE_ACTIVE, 42 RMPP_STATE_TIMEOUT, 43 RMPP_STATE_COMPLETE, 44 RMPP_STATE_CANCELING 45 }; 46 47 struct mad_rmpp_recv { 48 struct ib_mad_agent_private *agent; 49 struct list_head list; 50 struct delayed_work timeout_work; 51 struct delayed_work cleanup_work; 52 struct completion comp; 53 enum rmpp_state state; 54 spinlock_t lock; 55 atomic_t refcount; 56 57 struct ib_ah *ah; 58 struct ib_mad_recv_wc *rmpp_wc; 59 struct ib_mad_recv_buf *cur_seg_buf; 60 int last_ack; 61 int seg_num; 62 int newwin; 63 int repwin; 64 65 __be64 tid; 66 u32 src_qp; 67 u32 slid; 68 u8 mgmt_class; 69 u8 class_version; 70 u8 method; 71 u8 base_version; 72 }; 73 74 static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv) 75 { 76 if (atomic_dec_and_test(&rmpp_recv->refcount)) 77 complete(&rmpp_recv->comp); 78 } 79 80 static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv) 81 { 82 deref_rmpp_recv(rmpp_recv); 83 wait_for_completion(&rmpp_recv->comp); 84 rdma_destroy_ah(rmpp_recv->ah, RDMA_DESTROY_AH_SLEEPABLE); 85 kfree(rmpp_recv); 86 } 87 88 void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent) 89 { 90 struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv; 91 unsigned long flags; 92 93 spin_lock_irqsave(&agent->lock, flags); 94 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { 95 if (rmpp_recv->state != RMPP_STATE_COMPLETE) 96 ib_free_recv_mad(rmpp_recv->rmpp_wc); 97 rmpp_recv->state = RMPP_STATE_CANCELING; 98 } 99 spin_unlock_irqrestore(&agent->lock, flags); 100 101 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { 102 cancel_delayed_work(&rmpp_recv->timeout_work); 103 cancel_delayed_work(&rmpp_recv->cleanup_work); 104 } 105 106 flush_workqueue(agent->qp_info->port_priv->wq); 107 108 list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv, 109 &agent->rmpp_list, list) { 110 list_del(&rmpp_recv->list); 111 destroy_rmpp_recv(rmpp_recv); 112 } 113 } 114 115 static void format_ack(struct ib_mad_send_buf *msg, 116 struct ib_rmpp_mad *data, 117 struct mad_rmpp_recv *rmpp_recv) 118 { 119 struct ib_rmpp_mad *ack = msg->mad; 120 unsigned long flags; 121 122 memcpy(ack, &data->mad_hdr, msg->hdr_len); 123 124 ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP; 125 ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK; 126 ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 127 128 spin_lock_irqsave(&rmpp_recv->lock, flags); 129 rmpp_recv->last_ack = rmpp_recv->seg_num; 130 ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num); 131 ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin); 132 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 133 } 134 135 static void ack_recv(struct mad_rmpp_recv *rmpp_recv, 136 struct ib_mad_recv_wc *recv_wc) 137 { 138 struct ib_mad_send_buf *msg; 139 int ret, hdr_len; 140 141 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class); 142 msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp, 143 recv_wc->wc->pkey_index, 1, hdr_len, 144 0, GFP_KERNEL, 145 IB_MGMT_BASE_VERSION); 146 if (IS_ERR(msg)) 147 return; 148 149 format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv); 150 msg->ah = rmpp_recv->ah; 151 ret = ib_post_send_mad(msg, NULL); 152 if (ret) 153 ib_free_send_mad(msg); 154 } 155 156 static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent, 157 struct ib_mad_recv_wc *recv_wc) 158 { 159 struct ib_mad_send_buf *msg; 160 struct ib_ah *ah; 161 int hdr_len; 162 163 ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc, 164 recv_wc->recv_buf.grh, agent->port_num); 165 if (IS_ERR(ah)) 166 return (void *) ah; 167 168 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class); 169 msg = ib_create_send_mad(agent, recv_wc->wc->src_qp, 170 recv_wc->wc->pkey_index, 1, 171 hdr_len, 0, GFP_KERNEL, 172 IB_MGMT_BASE_VERSION); 173 if (IS_ERR(msg)) 174 rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE); 175 else { 176 msg->ah = ah; 177 msg->context[0] = ah; 178 } 179 180 return msg; 181 } 182 183 static void ack_ds_ack(struct ib_mad_agent_private *agent, 184 struct ib_mad_recv_wc *recv_wc) 185 { 186 struct ib_mad_send_buf *msg; 187 struct ib_rmpp_mad *rmpp_mad; 188 int ret; 189 190 msg = alloc_response_msg(&agent->agent, recv_wc); 191 if (IS_ERR(msg)) 192 return; 193 194 rmpp_mad = msg->mad; 195 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len); 196 197 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP; 198 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 199 rmpp_mad->rmpp_hdr.seg_num = 0; 200 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(1); 201 202 ret = ib_post_send_mad(msg, NULL); 203 if (ret) { 204 rdma_destroy_ah(msg->ah, RDMA_DESTROY_AH_SLEEPABLE); 205 ib_free_send_mad(msg); 206 } 207 } 208 209 void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc) 210 { 211 if (mad_send_wc->send_buf->context[0] == mad_send_wc->send_buf->ah) 212 rdma_destroy_ah(mad_send_wc->send_buf->ah, 213 RDMA_DESTROY_AH_SLEEPABLE); 214 ib_free_send_mad(mad_send_wc->send_buf); 215 } 216 217 static void nack_recv(struct ib_mad_agent_private *agent, 218 struct ib_mad_recv_wc *recv_wc, u8 rmpp_status) 219 { 220 struct ib_mad_send_buf *msg; 221 struct ib_rmpp_mad *rmpp_mad; 222 int ret; 223 224 msg = alloc_response_msg(&agent->agent, recv_wc); 225 if (IS_ERR(msg)) 226 return; 227 228 rmpp_mad = msg->mad; 229 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len); 230 231 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP; 232 rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION; 233 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT; 234 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 235 rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status; 236 rmpp_mad->rmpp_hdr.seg_num = 0; 237 rmpp_mad->rmpp_hdr.paylen_newwin = 0; 238 239 ret = ib_post_send_mad(msg, NULL); 240 if (ret) { 241 rdma_destroy_ah(msg->ah, RDMA_DESTROY_AH_SLEEPABLE); 242 ib_free_send_mad(msg); 243 } 244 } 245 246 static void recv_timeout_handler(struct work_struct *work) 247 { 248 struct mad_rmpp_recv *rmpp_recv = 249 container_of(work, struct mad_rmpp_recv, timeout_work.work); 250 struct ib_mad_recv_wc *rmpp_wc; 251 unsigned long flags; 252 253 spin_lock_irqsave(&rmpp_recv->agent->lock, flags); 254 if (rmpp_recv->state != RMPP_STATE_ACTIVE) { 255 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); 256 return; 257 } 258 rmpp_recv->state = RMPP_STATE_TIMEOUT; 259 list_del(&rmpp_recv->list); 260 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); 261 262 rmpp_wc = rmpp_recv->rmpp_wc; 263 nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L); 264 destroy_rmpp_recv(rmpp_recv); 265 ib_free_recv_mad(rmpp_wc); 266 } 267 268 static void recv_cleanup_handler(struct work_struct *work) 269 { 270 struct mad_rmpp_recv *rmpp_recv = 271 container_of(work, struct mad_rmpp_recv, cleanup_work.work); 272 unsigned long flags; 273 274 spin_lock_irqsave(&rmpp_recv->agent->lock, flags); 275 if (rmpp_recv->state == RMPP_STATE_CANCELING) { 276 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); 277 return; 278 } 279 list_del(&rmpp_recv->list); 280 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); 281 destroy_rmpp_recv(rmpp_recv); 282 } 283 284 static struct mad_rmpp_recv * 285 create_rmpp_recv(struct ib_mad_agent_private *agent, 286 struct ib_mad_recv_wc *mad_recv_wc) 287 { 288 struct mad_rmpp_recv *rmpp_recv; 289 struct ib_mad_hdr *mad_hdr; 290 291 rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL); 292 if (!rmpp_recv) 293 return NULL; 294 295 rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd, 296 mad_recv_wc->wc, 297 mad_recv_wc->recv_buf.grh, 298 agent->agent.port_num); 299 if (IS_ERR(rmpp_recv->ah)) 300 goto error; 301 302 rmpp_recv->agent = agent; 303 init_completion(&rmpp_recv->comp); 304 INIT_DELAYED_WORK(&rmpp_recv->timeout_work, recv_timeout_handler); 305 INIT_DELAYED_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler); 306 spin_lock_init(&rmpp_recv->lock); 307 rmpp_recv->state = RMPP_STATE_ACTIVE; 308 atomic_set(&rmpp_recv->refcount, 1); 309 310 rmpp_recv->rmpp_wc = mad_recv_wc; 311 rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf; 312 rmpp_recv->newwin = 1; 313 rmpp_recv->seg_num = 1; 314 rmpp_recv->last_ack = 0; 315 rmpp_recv->repwin = 1; 316 317 mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr; 318 rmpp_recv->tid = mad_hdr->tid; 319 rmpp_recv->src_qp = mad_recv_wc->wc->src_qp; 320 rmpp_recv->slid = mad_recv_wc->wc->slid; 321 rmpp_recv->mgmt_class = mad_hdr->mgmt_class; 322 rmpp_recv->class_version = mad_hdr->class_version; 323 rmpp_recv->method = mad_hdr->method; 324 rmpp_recv->base_version = mad_hdr->base_version; 325 return rmpp_recv; 326 327 error: kfree(rmpp_recv); 328 return NULL; 329 } 330 331 static struct mad_rmpp_recv * 332 find_rmpp_recv(struct ib_mad_agent_private *agent, 333 struct ib_mad_recv_wc *mad_recv_wc) 334 { 335 struct mad_rmpp_recv *rmpp_recv; 336 struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr; 337 338 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { 339 if (rmpp_recv->tid == mad_hdr->tid && 340 rmpp_recv->src_qp == mad_recv_wc->wc->src_qp && 341 rmpp_recv->slid == mad_recv_wc->wc->slid && 342 rmpp_recv->mgmt_class == mad_hdr->mgmt_class && 343 rmpp_recv->class_version == mad_hdr->class_version && 344 rmpp_recv->method == mad_hdr->method) 345 return rmpp_recv; 346 } 347 return NULL; 348 } 349 350 static struct mad_rmpp_recv * 351 acquire_rmpp_recv(struct ib_mad_agent_private *agent, 352 struct ib_mad_recv_wc *mad_recv_wc) 353 { 354 struct mad_rmpp_recv *rmpp_recv; 355 unsigned long flags; 356 357 spin_lock_irqsave(&agent->lock, flags); 358 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc); 359 if (rmpp_recv) 360 atomic_inc(&rmpp_recv->refcount); 361 spin_unlock_irqrestore(&agent->lock, flags); 362 return rmpp_recv; 363 } 364 365 static struct mad_rmpp_recv * 366 insert_rmpp_recv(struct ib_mad_agent_private *agent, 367 struct mad_rmpp_recv *rmpp_recv) 368 { 369 struct mad_rmpp_recv *cur_rmpp_recv; 370 371 cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc); 372 if (!cur_rmpp_recv) 373 list_add_tail(&rmpp_recv->list, &agent->rmpp_list); 374 375 return cur_rmpp_recv; 376 } 377 378 static inline int get_last_flag(struct ib_mad_recv_buf *seg) 379 { 380 struct ib_rmpp_mad *rmpp_mad; 381 382 rmpp_mad = (struct ib_rmpp_mad *) seg->mad; 383 return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST; 384 } 385 386 static inline int get_seg_num(struct ib_mad_recv_buf *seg) 387 { 388 struct ib_rmpp_mad *rmpp_mad; 389 390 rmpp_mad = (struct ib_rmpp_mad *) seg->mad; 391 return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num); 392 } 393 394 static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list, 395 struct ib_mad_recv_buf *seg) 396 { 397 if (seg->list.next == rmpp_list) 398 return NULL; 399 400 return container_of(seg->list.next, struct ib_mad_recv_buf, list); 401 } 402 403 static inline int window_size(struct ib_mad_agent_private *agent) 404 { 405 return max(agent->qp_info->recv_queue.max_active >> 3, 1); 406 } 407 408 static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list, 409 int seg_num) 410 { 411 struct ib_mad_recv_buf *seg_buf; 412 int cur_seg_num; 413 414 list_for_each_entry_reverse(seg_buf, rmpp_list, list) { 415 cur_seg_num = get_seg_num(seg_buf); 416 if (seg_num > cur_seg_num) 417 return seg_buf; 418 if (seg_num == cur_seg_num) 419 break; 420 } 421 return NULL; 422 } 423 424 static void update_seg_num(struct mad_rmpp_recv *rmpp_recv, 425 struct ib_mad_recv_buf *new_buf) 426 { 427 struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list; 428 429 while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) { 430 rmpp_recv->cur_seg_buf = new_buf; 431 rmpp_recv->seg_num++; 432 new_buf = get_next_seg(rmpp_list, new_buf); 433 } 434 } 435 436 static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv) 437 { 438 struct ib_rmpp_mad *rmpp_mad; 439 int hdr_size, data_size, pad; 440 bool opa = rdma_cap_opa_mad(rmpp_recv->agent->qp_info->port_priv->device, 441 rmpp_recv->agent->qp_info->port_priv->port_num); 442 443 rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad; 444 445 hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class); 446 if (opa && rmpp_recv->base_version == OPA_MGMT_BASE_VERSION) { 447 data_size = sizeof(struct opa_rmpp_mad) - hdr_size; 448 pad = OPA_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin); 449 if (pad > OPA_MGMT_RMPP_DATA || pad < 0) 450 pad = 0; 451 } else { 452 data_size = sizeof(struct ib_rmpp_mad) - hdr_size; 453 pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin); 454 if (pad > IB_MGMT_RMPP_DATA || pad < 0) 455 pad = 0; 456 } 457 458 return hdr_size + rmpp_recv->seg_num * data_size - pad; 459 } 460 461 static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv) 462 { 463 struct ib_mad_recv_wc *rmpp_wc; 464 465 ack_recv(rmpp_recv, rmpp_recv->rmpp_wc); 466 if (rmpp_recv->seg_num > 1) 467 cancel_delayed_work(&rmpp_recv->timeout_work); 468 469 rmpp_wc = rmpp_recv->rmpp_wc; 470 rmpp_wc->mad_len = get_mad_len(rmpp_recv); 471 /* 10 seconds until we can find the packet lifetime */ 472 queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq, 473 &rmpp_recv->cleanup_work, msecs_to_jiffies(10000)); 474 return rmpp_wc; 475 } 476 477 static struct ib_mad_recv_wc * 478 continue_rmpp(struct ib_mad_agent_private *agent, 479 struct ib_mad_recv_wc *mad_recv_wc) 480 { 481 struct mad_rmpp_recv *rmpp_recv; 482 struct ib_mad_recv_buf *prev_buf; 483 struct ib_mad_recv_wc *done_wc; 484 int seg_num; 485 unsigned long flags; 486 487 rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc); 488 if (!rmpp_recv) 489 goto drop1; 490 491 seg_num = get_seg_num(&mad_recv_wc->recv_buf); 492 493 spin_lock_irqsave(&rmpp_recv->lock, flags); 494 if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) || 495 (seg_num > rmpp_recv->newwin)) 496 goto drop3; 497 498 if ((seg_num <= rmpp_recv->last_ack) || 499 (rmpp_recv->state == RMPP_STATE_COMPLETE)) { 500 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 501 ack_recv(rmpp_recv, mad_recv_wc); 502 goto drop2; 503 } 504 505 prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num); 506 if (!prev_buf) 507 goto drop3; 508 509 done_wc = NULL; 510 list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list); 511 if (rmpp_recv->cur_seg_buf == prev_buf) { 512 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf); 513 if (get_last_flag(rmpp_recv->cur_seg_buf)) { 514 rmpp_recv->state = RMPP_STATE_COMPLETE; 515 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 516 done_wc = complete_rmpp(rmpp_recv); 517 goto out; 518 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) { 519 rmpp_recv->newwin += window_size(agent); 520 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 521 ack_recv(rmpp_recv, mad_recv_wc); 522 goto out; 523 } 524 } 525 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 526 out: 527 deref_rmpp_recv(rmpp_recv); 528 return done_wc; 529 530 drop3: spin_unlock_irqrestore(&rmpp_recv->lock, flags); 531 drop2: deref_rmpp_recv(rmpp_recv); 532 drop1: ib_free_recv_mad(mad_recv_wc); 533 return NULL; 534 } 535 536 static struct ib_mad_recv_wc * 537 start_rmpp(struct ib_mad_agent_private *agent, 538 struct ib_mad_recv_wc *mad_recv_wc) 539 { 540 struct mad_rmpp_recv *rmpp_recv; 541 unsigned long flags; 542 543 rmpp_recv = create_rmpp_recv(agent, mad_recv_wc); 544 if (!rmpp_recv) { 545 ib_free_recv_mad(mad_recv_wc); 546 return NULL; 547 } 548 549 spin_lock_irqsave(&agent->lock, flags); 550 if (insert_rmpp_recv(agent, rmpp_recv)) { 551 spin_unlock_irqrestore(&agent->lock, flags); 552 /* duplicate first MAD */ 553 destroy_rmpp_recv(rmpp_recv); 554 return continue_rmpp(agent, mad_recv_wc); 555 } 556 atomic_inc(&rmpp_recv->refcount); 557 558 if (get_last_flag(&mad_recv_wc->recv_buf)) { 559 rmpp_recv->state = RMPP_STATE_COMPLETE; 560 spin_unlock_irqrestore(&agent->lock, flags); 561 complete_rmpp(rmpp_recv); 562 } else { 563 spin_unlock_irqrestore(&agent->lock, flags); 564 /* 40 seconds until we can find the packet lifetimes */ 565 queue_delayed_work(agent->qp_info->port_priv->wq, 566 &rmpp_recv->timeout_work, 567 msecs_to_jiffies(40000)); 568 rmpp_recv->newwin += window_size(agent); 569 ack_recv(rmpp_recv, mad_recv_wc); 570 mad_recv_wc = NULL; 571 } 572 deref_rmpp_recv(rmpp_recv); 573 return mad_recv_wc; 574 } 575 576 static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr) 577 { 578 struct ib_rmpp_mad *rmpp_mad; 579 int timeout; 580 u32 paylen = 0; 581 582 rmpp_mad = mad_send_wr->send_buf.mad; 583 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 584 rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num); 585 586 if (mad_send_wr->seg_num == 1) { 587 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST; 588 paylen = (mad_send_wr->send_buf.seg_count * 589 mad_send_wr->send_buf.seg_rmpp_size) - 590 mad_send_wr->pad; 591 } 592 593 if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) { 594 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST; 595 paylen = mad_send_wr->send_buf.seg_rmpp_size - mad_send_wr->pad; 596 } 597 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen); 598 599 /* 2 seconds for an ACK until we can find the packet lifetime */ 600 timeout = mad_send_wr->send_buf.timeout_ms; 601 if (!timeout || timeout > 2000) 602 mad_send_wr->timeout = msecs_to_jiffies(2000); 603 604 return ib_send_mad(mad_send_wr); 605 } 606 607 static void abort_send(struct ib_mad_agent_private *agent, 608 struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status) 609 { 610 struct ib_mad_send_wr_private *mad_send_wr; 611 struct ib_mad_send_wc wc; 612 unsigned long flags; 613 614 spin_lock_irqsave(&agent->lock, flags); 615 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc); 616 if (!mad_send_wr) 617 goto out; /* Unmatched send */ 618 619 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) || 620 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS)) 621 goto out; /* Send is already done */ 622 623 ib_mark_mad_done(mad_send_wr); 624 spin_unlock_irqrestore(&agent->lock, flags); 625 626 wc.status = IB_WC_REM_ABORT_ERR; 627 wc.vendor_err = rmpp_status; 628 wc.send_buf = &mad_send_wr->send_buf; 629 ib_mad_complete_send_wr(mad_send_wr, &wc); 630 return; 631 out: 632 spin_unlock_irqrestore(&agent->lock, flags); 633 } 634 635 static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr, 636 int seg_num) 637 { 638 struct list_head *list; 639 640 wr->last_ack = seg_num; 641 list = &wr->last_ack_seg->list; 642 list_for_each_entry(wr->last_ack_seg, list, list) 643 if (wr->last_ack_seg->num == seg_num) 644 break; 645 } 646 647 static void process_ds_ack(struct ib_mad_agent_private *agent, 648 struct ib_mad_recv_wc *mad_recv_wc, int newwin) 649 { 650 struct mad_rmpp_recv *rmpp_recv; 651 652 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc); 653 if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE) 654 rmpp_recv->repwin = newwin; 655 } 656 657 static void process_rmpp_ack(struct ib_mad_agent_private *agent, 658 struct ib_mad_recv_wc *mad_recv_wc) 659 { 660 struct ib_mad_send_wr_private *mad_send_wr; 661 struct ib_rmpp_mad *rmpp_mad; 662 unsigned long flags; 663 int seg_num, newwin, ret; 664 665 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 666 if (rmpp_mad->rmpp_hdr.rmpp_status) { 667 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 668 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 669 return; 670 } 671 672 seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num); 673 newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin); 674 if (newwin < seg_num) { 675 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S); 676 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S); 677 return; 678 } 679 680 spin_lock_irqsave(&agent->lock, flags); 681 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc); 682 if (!mad_send_wr) { 683 if (!seg_num) 684 process_ds_ack(agent, mad_recv_wc, newwin); 685 goto out; /* Unmatched or DS RMPP ACK */ 686 } 687 688 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) && 689 (mad_send_wr->timeout)) { 690 spin_unlock_irqrestore(&agent->lock, flags); 691 ack_ds_ack(agent, mad_recv_wc); 692 return; /* Repeated ACK for DS RMPP transaction */ 693 } 694 695 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) || 696 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS)) 697 goto out; /* Send is already done */ 698 699 if (seg_num > mad_send_wr->send_buf.seg_count || 700 seg_num > mad_send_wr->newwin) { 701 spin_unlock_irqrestore(&agent->lock, flags); 702 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B); 703 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B); 704 return; 705 } 706 707 if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack) 708 goto out; /* Old ACK */ 709 710 if (seg_num > mad_send_wr->last_ack) { 711 adjust_last_ack(mad_send_wr, seg_num); 712 mad_send_wr->retries_left = mad_send_wr->max_retries; 713 } 714 mad_send_wr->newwin = newwin; 715 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) { 716 /* If no response is expected, the ACK completes the send */ 717 if (!mad_send_wr->send_buf.timeout_ms) { 718 struct ib_mad_send_wc wc; 719 720 ib_mark_mad_done(mad_send_wr); 721 spin_unlock_irqrestore(&agent->lock, flags); 722 723 wc.status = IB_WC_SUCCESS; 724 wc.vendor_err = 0; 725 wc.send_buf = &mad_send_wr->send_buf; 726 ib_mad_complete_send_wr(mad_send_wr, &wc); 727 return; 728 } 729 if (mad_send_wr->refcount == 1) 730 ib_reset_mad_timeout(mad_send_wr, 731 mad_send_wr->send_buf.timeout_ms); 732 spin_unlock_irqrestore(&agent->lock, flags); 733 ack_ds_ack(agent, mad_recv_wc); 734 return; 735 } else if (mad_send_wr->refcount == 1 && 736 mad_send_wr->seg_num < mad_send_wr->newwin && 737 mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) { 738 /* Send failure will just result in a timeout/retry */ 739 ret = send_next_seg(mad_send_wr); 740 if (ret) 741 goto out; 742 743 mad_send_wr->refcount++; 744 list_move_tail(&mad_send_wr->agent_list, 745 &mad_send_wr->mad_agent_priv->send_list); 746 } 747 out: 748 spin_unlock_irqrestore(&agent->lock, flags); 749 } 750 751 static struct ib_mad_recv_wc * 752 process_rmpp_data(struct ib_mad_agent_private *agent, 753 struct ib_mad_recv_wc *mad_recv_wc) 754 { 755 struct ib_rmpp_hdr *rmpp_hdr; 756 u8 rmpp_status; 757 758 rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr; 759 760 if (rmpp_hdr->rmpp_status) { 761 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS; 762 goto bad; 763 } 764 765 if (rmpp_hdr->seg_num == cpu_to_be32(1)) { 766 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) { 767 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG; 768 goto bad; 769 } 770 return start_rmpp(agent, mad_recv_wc); 771 } else { 772 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) { 773 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG; 774 goto bad; 775 } 776 return continue_rmpp(agent, mad_recv_wc); 777 } 778 bad: 779 nack_recv(agent, mad_recv_wc, rmpp_status); 780 ib_free_recv_mad(mad_recv_wc); 781 return NULL; 782 } 783 784 static void process_rmpp_stop(struct ib_mad_agent_private *agent, 785 struct ib_mad_recv_wc *mad_recv_wc) 786 { 787 struct ib_rmpp_mad *rmpp_mad; 788 789 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 790 791 if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) { 792 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 793 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 794 } else 795 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status); 796 } 797 798 static void process_rmpp_abort(struct ib_mad_agent_private *agent, 799 struct ib_mad_recv_wc *mad_recv_wc) 800 { 801 struct ib_rmpp_mad *rmpp_mad; 802 803 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 804 805 if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN || 806 rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) { 807 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 808 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 809 } else 810 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status); 811 } 812 813 struct ib_mad_recv_wc * 814 ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent, 815 struct ib_mad_recv_wc *mad_recv_wc) 816 { 817 struct ib_rmpp_mad *rmpp_mad; 818 819 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 820 if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE)) 821 return mad_recv_wc; 822 823 if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) { 824 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV); 825 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV); 826 goto out; 827 } 828 829 switch (rmpp_mad->rmpp_hdr.rmpp_type) { 830 case IB_MGMT_RMPP_TYPE_DATA: 831 return process_rmpp_data(agent, mad_recv_wc); 832 case IB_MGMT_RMPP_TYPE_ACK: 833 process_rmpp_ack(agent, mad_recv_wc); 834 break; 835 case IB_MGMT_RMPP_TYPE_STOP: 836 process_rmpp_stop(agent, mad_recv_wc); 837 break; 838 case IB_MGMT_RMPP_TYPE_ABORT: 839 process_rmpp_abort(agent, mad_recv_wc); 840 break; 841 default: 842 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT); 843 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT); 844 break; 845 } 846 out: 847 ib_free_recv_mad(mad_recv_wc); 848 return NULL; 849 } 850 851 static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr) 852 { 853 struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv; 854 struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad; 855 struct mad_rmpp_recv *rmpp_recv; 856 struct rdma_ah_attr ah_attr; 857 unsigned long flags; 858 int newwin = 1; 859 860 if (!(mad_hdr->method & IB_MGMT_METHOD_RESP)) 861 goto out; 862 863 spin_lock_irqsave(&agent->lock, flags); 864 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { 865 if (rmpp_recv->tid != mad_hdr->tid || 866 rmpp_recv->mgmt_class != mad_hdr->mgmt_class || 867 rmpp_recv->class_version != mad_hdr->class_version || 868 (rmpp_recv->method & IB_MGMT_METHOD_RESP)) 869 continue; 870 871 if (rdma_query_ah(mad_send_wr->send_buf.ah, &ah_attr)) 872 continue; 873 874 if (rmpp_recv->slid == rdma_ah_get_dlid(&ah_attr)) { 875 newwin = rmpp_recv->repwin; 876 break; 877 } 878 } 879 spin_unlock_irqrestore(&agent->lock, flags); 880 out: 881 return newwin; 882 } 883 884 int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr) 885 { 886 struct ib_rmpp_mad *rmpp_mad; 887 int ret; 888 889 rmpp_mad = mad_send_wr->send_buf.mad; 890 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 891 IB_MGMT_RMPP_FLAG_ACTIVE)) 892 return IB_RMPP_RESULT_UNHANDLED; 893 894 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) { 895 mad_send_wr->seg_num = 1; 896 return IB_RMPP_RESULT_INTERNAL; 897 } 898 899 mad_send_wr->newwin = init_newwin(mad_send_wr); 900 901 /* We need to wait for the final ACK even if there isn't a response */ 902 mad_send_wr->refcount += (mad_send_wr->timeout == 0); 903 ret = send_next_seg(mad_send_wr); 904 if (!ret) 905 return IB_RMPP_RESULT_CONSUMED; 906 return ret; 907 } 908 909 int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr, 910 struct ib_mad_send_wc *mad_send_wc) 911 { 912 struct ib_rmpp_mad *rmpp_mad; 913 int ret; 914 915 rmpp_mad = mad_send_wr->send_buf.mad; 916 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 917 IB_MGMT_RMPP_FLAG_ACTIVE)) 918 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */ 919 920 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) 921 return IB_RMPP_RESULT_INTERNAL; /* ACK, STOP, or ABORT */ 922 923 if (mad_send_wc->status != IB_WC_SUCCESS || 924 mad_send_wr->status != IB_WC_SUCCESS) 925 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */ 926 927 if (!mad_send_wr->timeout) 928 return IB_RMPP_RESULT_PROCESSED; /* Response received */ 929 930 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) { 931 mad_send_wr->timeout = 932 msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms); 933 return IB_RMPP_RESULT_PROCESSED; /* Send done */ 934 } 935 936 if (mad_send_wr->seg_num == mad_send_wr->newwin || 937 mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) 938 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */ 939 940 ret = send_next_seg(mad_send_wr); 941 if (ret) { 942 mad_send_wc->status = IB_WC_GENERAL_ERR; 943 return IB_RMPP_RESULT_PROCESSED; 944 } 945 return IB_RMPP_RESULT_CONSUMED; 946 } 947 948 int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr) 949 { 950 struct ib_rmpp_mad *rmpp_mad; 951 int ret; 952 953 rmpp_mad = mad_send_wr->send_buf.mad; 954 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 955 IB_MGMT_RMPP_FLAG_ACTIVE)) 956 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */ 957 958 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) 959 return IB_RMPP_RESULT_PROCESSED; 960 961 mad_send_wr->seg_num = mad_send_wr->last_ack; 962 mad_send_wr->cur_seg = mad_send_wr->last_ack_seg; 963 964 ret = send_next_seg(mad_send_wr); 965 if (ret) 966 return IB_RMPP_RESULT_PROCESSED; 967 968 return IB_RMPP_RESULT_CONSUMED; 969 } 970