mad_rmpp.c revision 2b3e258e5dd1938e2708eb5354ad8ba056fe8154
1/* 2 * Copyright (c) 2005 Intel Inc. All rights reserved. 3 * Copyright (c) 2005-2006 Voltaire, Inc. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 * 33 * $Id: mad_rmpp.c 1921 2005-03-02 22:58:44Z sean.hefty $ 34 */ 35 36#include "mad_priv.h" 37#include "mad_rmpp.h" 38 39enum rmpp_state { 40 RMPP_STATE_ACTIVE, 41 RMPP_STATE_TIMEOUT, 42 RMPP_STATE_COMPLETE 43}; 44 45struct mad_rmpp_recv { 46 struct ib_mad_agent_private *agent; 47 struct list_head list; 48 struct work_struct timeout_work; 49 struct work_struct cleanup_work; 50 struct completion comp; 51 enum rmpp_state state; 52 spinlock_t lock; 53 atomic_t refcount; 54 55 struct ib_ah *ah; 56 struct ib_mad_recv_wc *rmpp_wc; 57 struct ib_mad_recv_buf *cur_seg_buf; 58 int last_ack; 59 int seg_num; 60 int newwin; 61 int repwin; 62 63 __be64 tid; 64 u32 src_qp; 65 u16 slid; 66 u8 mgmt_class; 67 u8 class_version; 68 u8 method; 69}; 70 71static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv) 72{ 73 if (atomic_dec_and_test(&rmpp_recv->refcount)) 74 complete(&rmpp_recv->comp); 75} 76 77static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv) 78{ 79 deref_rmpp_recv(rmpp_recv); 80 wait_for_completion(&rmpp_recv->comp); 81 ib_destroy_ah(rmpp_recv->ah); 82 kfree(rmpp_recv); 83} 84 85void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent) 86{ 87 struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv; 88 unsigned long flags; 89 90 spin_lock_irqsave(&agent->lock, flags); 91 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { 92 cancel_delayed_work(&rmpp_recv->timeout_work); 93 cancel_delayed_work(&rmpp_recv->cleanup_work); 94 } 95 spin_unlock_irqrestore(&agent->lock, flags); 96 97 flush_workqueue(agent->qp_info->port_priv->wq); 98 99 list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv, 100 &agent->rmpp_list, list) { 101 list_del(&rmpp_recv->list); 102 if (rmpp_recv->state != RMPP_STATE_COMPLETE) 103 ib_free_recv_mad(rmpp_recv->rmpp_wc); 104 destroy_rmpp_recv(rmpp_recv); 105 } 106} 107 108static void format_ack(struct ib_mad_send_buf *msg, 109 struct ib_rmpp_mad *data, 110 struct mad_rmpp_recv *rmpp_recv) 111{ 112 struct ib_rmpp_mad *ack = msg->mad; 113 unsigned long flags; 114 115 memcpy(ack, &data->mad_hdr, msg->hdr_len); 116 117 ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP; 118 ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK; 119 ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 120 121 spin_lock_irqsave(&rmpp_recv->lock, flags); 122 rmpp_recv->last_ack = rmpp_recv->seg_num; 123 ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num); 124 ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin); 125 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 126} 127 128static void ack_recv(struct mad_rmpp_recv *rmpp_recv, 129 struct ib_mad_recv_wc *recv_wc) 130{ 131 struct ib_mad_send_buf *msg; 132 int ret, hdr_len; 133 134 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class); 135 msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp, 136 recv_wc->wc->pkey_index, 1, hdr_len, 137 0, GFP_KERNEL); 138 if (!msg) 139 return; 140 141 format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv); 142 msg->ah = rmpp_recv->ah; 143 ret = ib_post_send_mad(msg, NULL); 144 if (ret) 145 ib_free_send_mad(msg); 146} 147 148static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent, 149 struct ib_mad_recv_wc *recv_wc) 150{ 151 struct ib_mad_send_buf *msg; 152 struct ib_ah *ah; 153 int hdr_len; 154 155 ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc, 156 recv_wc->recv_buf.grh, agent->port_num); 157 if (IS_ERR(ah)) 158 return (void *) ah; 159 160 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class); 161 msg = ib_create_send_mad(agent, recv_wc->wc->src_qp, 162 recv_wc->wc->pkey_index, 1, 163 hdr_len, 0, GFP_KERNEL); 164 if (IS_ERR(msg)) 165 ib_destroy_ah(ah); 166 else 167 msg->ah = ah; 168 169 return msg; 170} 171 172static void ack_ds_ack(struct ib_mad_agent_private *agent, 173 struct ib_mad_recv_wc *recv_wc) 174{ 175 struct ib_mad_send_buf *msg; 176 struct ib_rmpp_mad *rmpp_mad; 177 int ret; 178 179 msg = alloc_response_msg(&agent->agent, recv_wc); 180 if (IS_ERR(msg)) 181 return; 182 183 rmpp_mad = msg->mad; 184 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len); 185 186 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP; 187 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 188 rmpp_mad->rmpp_hdr.seg_num = 0; 189 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(1); 190 191 ret = ib_post_send_mad(msg, NULL); 192 if (ret) { 193 ib_destroy_ah(msg->ah); 194 ib_free_send_mad(msg); 195 } 196} 197 198void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc) 199{ 200 struct ib_rmpp_mad *rmpp_mad = mad_send_wc->send_buf->mad; 201 202 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_ACK) 203 ib_destroy_ah(mad_send_wc->send_buf->ah); 204 ib_free_send_mad(mad_send_wc->send_buf); 205} 206 207static void nack_recv(struct ib_mad_agent_private *agent, 208 struct ib_mad_recv_wc *recv_wc, u8 rmpp_status) 209{ 210 struct ib_mad_send_buf *msg; 211 struct ib_rmpp_mad *rmpp_mad; 212 int ret; 213 214 msg = alloc_response_msg(&agent->agent, recv_wc); 215 if (IS_ERR(msg)) 216 return; 217 218 rmpp_mad = msg->mad; 219 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len); 220 221 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP; 222 rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION; 223 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT; 224 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 225 rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status; 226 rmpp_mad->rmpp_hdr.seg_num = 0; 227 rmpp_mad->rmpp_hdr.paylen_newwin = 0; 228 229 ret = ib_post_send_mad(msg, NULL); 230 if (ret) { 231 ib_destroy_ah(msg->ah); 232 ib_free_send_mad(msg); 233 } 234} 235 236static void recv_timeout_handler(void *data) 237{ 238 struct mad_rmpp_recv *rmpp_recv = data; 239 struct ib_mad_recv_wc *rmpp_wc; 240 unsigned long flags; 241 242 spin_lock_irqsave(&rmpp_recv->agent->lock, flags); 243 if (rmpp_recv->state != RMPP_STATE_ACTIVE) { 244 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); 245 return; 246 } 247 rmpp_recv->state = RMPP_STATE_TIMEOUT; 248 list_del(&rmpp_recv->list); 249 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); 250 251 rmpp_wc = rmpp_recv->rmpp_wc; 252 nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L); 253 destroy_rmpp_recv(rmpp_recv); 254 ib_free_recv_mad(rmpp_wc); 255} 256 257static void recv_cleanup_handler(void *data) 258{ 259 struct mad_rmpp_recv *rmpp_recv = data; 260 unsigned long flags; 261 262 spin_lock_irqsave(&rmpp_recv->agent->lock, flags); 263 list_del(&rmpp_recv->list); 264 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); 265 destroy_rmpp_recv(rmpp_recv); 266} 267 268static struct mad_rmpp_recv * 269create_rmpp_recv(struct ib_mad_agent_private *agent, 270 struct ib_mad_recv_wc *mad_recv_wc) 271{ 272 struct mad_rmpp_recv *rmpp_recv; 273 struct ib_mad_hdr *mad_hdr; 274 275 rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL); 276 if (!rmpp_recv) 277 return NULL; 278 279 rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd, 280 mad_recv_wc->wc, 281 mad_recv_wc->recv_buf.grh, 282 agent->agent.port_num); 283 if (IS_ERR(rmpp_recv->ah)) 284 goto error; 285 286 rmpp_recv->agent = agent; 287 init_completion(&rmpp_recv->comp); 288 INIT_WORK(&rmpp_recv->timeout_work, recv_timeout_handler, rmpp_recv); 289 INIT_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler, rmpp_recv); 290 spin_lock_init(&rmpp_recv->lock); 291 rmpp_recv->state = RMPP_STATE_ACTIVE; 292 atomic_set(&rmpp_recv->refcount, 1); 293 294 rmpp_recv->rmpp_wc = mad_recv_wc; 295 rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf; 296 rmpp_recv->newwin = 1; 297 rmpp_recv->seg_num = 1; 298 rmpp_recv->last_ack = 0; 299 rmpp_recv->repwin = 1; 300 301 mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr; 302 rmpp_recv->tid = mad_hdr->tid; 303 rmpp_recv->src_qp = mad_recv_wc->wc->src_qp; 304 rmpp_recv->slid = mad_recv_wc->wc->slid; 305 rmpp_recv->mgmt_class = mad_hdr->mgmt_class; 306 rmpp_recv->class_version = mad_hdr->class_version; 307 rmpp_recv->method = mad_hdr->method; 308 return rmpp_recv; 309 310error: kfree(rmpp_recv); 311 return NULL; 312} 313 314static struct mad_rmpp_recv * 315find_rmpp_recv(struct ib_mad_agent_private *agent, 316 struct ib_mad_recv_wc *mad_recv_wc) 317{ 318 struct mad_rmpp_recv *rmpp_recv; 319 struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr; 320 321 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { 322 if (rmpp_recv->tid == mad_hdr->tid && 323 rmpp_recv->src_qp == mad_recv_wc->wc->src_qp && 324 rmpp_recv->slid == mad_recv_wc->wc->slid && 325 rmpp_recv->mgmt_class == mad_hdr->mgmt_class && 326 rmpp_recv->class_version == mad_hdr->class_version && 327 rmpp_recv->method == mad_hdr->method) 328 return rmpp_recv; 329 } 330 return NULL; 331} 332 333static struct mad_rmpp_recv * 334acquire_rmpp_recv(struct ib_mad_agent_private *agent, 335 struct ib_mad_recv_wc *mad_recv_wc) 336{ 337 struct mad_rmpp_recv *rmpp_recv; 338 unsigned long flags; 339 340 spin_lock_irqsave(&agent->lock, flags); 341 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc); 342 if (rmpp_recv) 343 atomic_inc(&rmpp_recv->refcount); 344 spin_unlock_irqrestore(&agent->lock, flags); 345 return rmpp_recv; 346} 347 348static struct mad_rmpp_recv * 349insert_rmpp_recv(struct ib_mad_agent_private *agent, 350 struct mad_rmpp_recv *rmpp_recv) 351{ 352 struct mad_rmpp_recv *cur_rmpp_recv; 353 354 cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc); 355 if (!cur_rmpp_recv) 356 list_add_tail(&rmpp_recv->list, &agent->rmpp_list); 357 358 return cur_rmpp_recv; 359} 360 361static inline int get_last_flag(struct ib_mad_recv_buf *seg) 362{ 363 struct ib_rmpp_mad *rmpp_mad; 364 365 rmpp_mad = (struct ib_rmpp_mad *) seg->mad; 366 return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST; 367} 368 369static inline int get_seg_num(struct ib_mad_recv_buf *seg) 370{ 371 struct ib_rmpp_mad *rmpp_mad; 372 373 rmpp_mad = (struct ib_rmpp_mad *) seg->mad; 374 return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num); 375} 376 377static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list, 378 struct ib_mad_recv_buf *seg) 379{ 380 if (seg->list.next == rmpp_list) 381 return NULL; 382 383 return container_of(seg->list.next, struct ib_mad_recv_buf, list); 384} 385 386static inline int window_size(struct ib_mad_agent_private *agent) 387{ 388 return max(agent->qp_info->recv_queue.max_active >> 3, 1); 389} 390 391static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list, 392 int seg_num) 393{ 394 struct ib_mad_recv_buf *seg_buf; 395 int cur_seg_num; 396 397 list_for_each_entry_reverse(seg_buf, rmpp_list, list) { 398 cur_seg_num = get_seg_num(seg_buf); 399 if (seg_num > cur_seg_num) 400 return seg_buf; 401 if (seg_num == cur_seg_num) 402 break; 403 } 404 return NULL; 405} 406 407static void update_seg_num(struct mad_rmpp_recv *rmpp_recv, 408 struct ib_mad_recv_buf *new_buf) 409{ 410 struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list; 411 412 while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) { 413 rmpp_recv->cur_seg_buf = new_buf; 414 rmpp_recv->seg_num++; 415 new_buf = get_next_seg(rmpp_list, new_buf); 416 } 417} 418 419static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv) 420{ 421 struct ib_rmpp_mad *rmpp_mad; 422 int hdr_size, data_size, pad; 423 424 rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad; 425 426 hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class); 427 data_size = sizeof(struct ib_rmpp_mad) - hdr_size; 428 pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin); 429 if (pad > IB_MGMT_RMPP_DATA || pad < 0) 430 pad = 0; 431 432 return hdr_size + rmpp_recv->seg_num * data_size - pad; 433} 434 435static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv) 436{ 437 struct ib_mad_recv_wc *rmpp_wc; 438 439 ack_recv(rmpp_recv, rmpp_recv->rmpp_wc); 440 if (rmpp_recv->seg_num > 1) 441 cancel_delayed_work(&rmpp_recv->timeout_work); 442 443 rmpp_wc = rmpp_recv->rmpp_wc; 444 rmpp_wc->mad_len = get_mad_len(rmpp_recv); 445 /* 10 seconds until we can find the packet lifetime */ 446 queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq, 447 &rmpp_recv->cleanup_work, msecs_to_jiffies(10000)); 448 return rmpp_wc; 449} 450 451static struct ib_mad_recv_wc * 452continue_rmpp(struct ib_mad_agent_private *agent, 453 struct ib_mad_recv_wc *mad_recv_wc) 454{ 455 struct mad_rmpp_recv *rmpp_recv; 456 struct ib_mad_recv_buf *prev_buf; 457 struct ib_mad_recv_wc *done_wc; 458 int seg_num; 459 unsigned long flags; 460 461 rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc); 462 if (!rmpp_recv) 463 goto drop1; 464 465 seg_num = get_seg_num(&mad_recv_wc->recv_buf); 466 467 spin_lock_irqsave(&rmpp_recv->lock, flags); 468 if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) || 469 (seg_num > rmpp_recv->newwin)) 470 goto drop3; 471 472 if ((seg_num <= rmpp_recv->last_ack) || 473 (rmpp_recv->state == RMPP_STATE_COMPLETE)) { 474 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 475 ack_recv(rmpp_recv, mad_recv_wc); 476 goto drop2; 477 } 478 479 prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num); 480 if (!prev_buf) 481 goto drop3; 482 483 done_wc = NULL; 484 list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list); 485 if (rmpp_recv->cur_seg_buf == prev_buf) { 486 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf); 487 if (get_last_flag(rmpp_recv->cur_seg_buf)) { 488 rmpp_recv->state = RMPP_STATE_COMPLETE; 489 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 490 done_wc = complete_rmpp(rmpp_recv); 491 goto out; 492 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) { 493 rmpp_recv->newwin += window_size(agent); 494 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 495 ack_recv(rmpp_recv, mad_recv_wc); 496 goto out; 497 } 498 } 499 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 500out: 501 deref_rmpp_recv(rmpp_recv); 502 return done_wc; 503 504drop3: spin_unlock_irqrestore(&rmpp_recv->lock, flags); 505drop2: deref_rmpp_recv(rmpp_recv); 506drop1: ib_free_recv_mad(mad_recv_wc); 507 return NULL; 508} 509 510static struct ib_mad_recv_wc * 511start_rmpp(struct ib_mad_agent_private *agent, 512 struct ib_mad_recv_wc *mad_recv_wc) 513{ 514 struct mad_rmpp_recv *rmpp_recv; 515 unsigned long flags; 516 517 rmpp_recv = create_rmpp_recv(agent, mad_recv_wc); 518 if (!rmpp_recv) { 519 ib_free_recv_mad(mad_recv_wc); 520 return NULL; 521 } 522 523 spin_lock_irqsave(&agent->lock, flags); 524 if (insert_rmpp_recv(agent, rmpp_recv)) { 525 spin_unlock_irqrestore(&agent->lock, flags); 526 /* duplicate first MAD */ 527 destroy_rmpp_recv(rmpp_recv); 528 return continue_rmpp(agent, mad_recv_wc); 529 } 530 atomic_inc(&rmpp_recv->refcount); 531 532 if (get_last_flag(&mad_recv_wc->recv_buf)) { 533 rmpp_recv->state = RMPP_STATE_COMPLETE; 534 spin_unlock_irqrestore(&agent->lock, flags); 535 complete_rmpp(rmpp_recv); 536 } else { 537 spin_unlock_irqrestore(&agent->lock, flags); 538 /* 40 seconds until we can find the packet lifetimes */ 539 queue_delayed_work(agent->qp_info->port_priv->wq, 540 &rmpp_recv->timeout_work, 541 msecs_to_jiffies(40000)); 542 rmpp_recv->newwin += window_size(agent); 543 ack_recv(rmpp_recv, mad_recv_wc); 544 mad_recv_wc = NULL; 545 } 546 deref_rmpp_recv(rmpp_recv); 547 return mad_recv_wc; 548} 549 550static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr) 551{ 552 struct ib_rmpp_mad *rmpp_mad; 553 int timeout; 554 u32 paylen = 0; 555 556 rmpp_mad = mad_send_wr->send_buf.mad; 557 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 558 rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num); 559 560 if (mad_send_wr->seg_num == 1) { 561 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST; 562 paylen = mad_send_wr->send_buf.seg_count * IB_MGMT_RMPP_DATA - 563 mad_send_wr->pad; 564 } 565 566 if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) { 567 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST; 568 paylen = IB_MGMT_RMPP_DATA - mad_send_wr->pad; 569 } 570 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen); 571 572 /* 2 seconds for an ACK until we can find the packet lifetime */ 573 timeout = mad_send_wr->send_buf.timeout_ms; 574 if (!timeout || timeout > 2000) 575 mad_send_wr->timeout = msecs_to_jiffies(2000); 576 577 return ib_send_mad(mad_send_wr); 578} 579 580static void abort_send(struct ib_mad_agent_private *agent, 581 struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status) 582{ 583 struct ib_mad_send_wr_private *mad_send_wr; 584 struct ib_mad_send_wc wc; 585 unsigned long flags; 586 587 spin_lock_irqsave(&agent->lock, flags); 588 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc); 589 if (!mad_send_wr) 590 goto out; /* Unmatched send */ 591 592 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) || 593 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS)) 594 goto out; /* Send is already done */ 595 596 ib_mark_mad_done(mad_send_wr); 597 spin_unlock_irqrestore(&agent->lock, flags); 598 599 wc.status = IB_WC_REM_ABORT_ERR; 600 wc.vendor_err = rmpp_status; 601 wc.send_buf = &mad_send_wr->send_buf; 602 ib_mad_complete_send_wr(mad_send_wr, &wc); 603 return; 604out: 605 spin_unlock_irqrestore(&agent->lock, flags); 606} 607 608static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr, 609 int seg_num) 610{ 611 struct list_head *list; 612 613 wr->last_ack = seg_num; 614 list = &wr->last_ack_seg->list; 615 list_for_each_entry(wr->last_ack_seg, list, list) 616 if (wr->last_ack_seg->num == seg_num) 617 break; 618} 619 620static void process_ds_ack(struct ib_mad_agent_private *agent, 621 struct ib_mad_recv_wc *mad_recv_wc, int newwin) 622{ 623 struct mad_rmpp_recv *rmpp_recv; 624 625 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc); 626 if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE) 627 rmpp_recv->repwin = newwin; 628} 629 630static void process_rmpp_ack(struct ib_mad_agent_private *agent, 631 struct ib_mad_recv_wc *mad_recv_wc) 632{ 633 struct ib_mad_send_wr_private *mad_send_wr; 634 struct ib_rmpp_mad *rmpp_mad; 635 unsigned long flags; 636 int seg_num, newwin, ret; 637 638 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 639 if (rmpp_mad->rmpp_hdr.rmpp_status) { 640 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 641 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 642 return; 643 } 644 645 seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num); 646 newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin); 647 if (newwin < seg_num) { 648 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S); 649 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S); 650 return; 651 } 652 653 spin_lock_irqsave(&agent->lock, flags); 654 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc); 655 if (!mad_send_wr) { 656 if (!seg_num) 657 process_ds_ack(agent, mad_recv_wc, newwin); 658 goto out; /* Unmatched or DS RMPP ACK */ 659 } 660 661 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) && 662 (mad_send_wr->timeout)) { 663 spin_unlock_irqrestore(&agent->lock, flags); 664 ack_ds_ack(agent, mad_recv_wc); 665 return; /* Repeated ACK for DS RMPP transaction */ 666 } 667 668 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) || 669 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS)) 670 goto out; /* Send is already done */ 671 672 if (seg_num > mad_send_wr->send_buf.seg_count || 673 seg_num > mad_send_wr->newwin) { 674 spin_unlock_irqrestore(&agent->lock, flags); 675 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B); 676 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B); 677 return; 678 } 679 680 if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack) 681 goto out; /* Old ACK */ 682 683 if (seg_num > mad_send_wr->last_ack) { 684 adjust_last_ack(mad_send_wr, seg_num); 685 mad_send_wr->retries = mad_send_wr->send_buf.retries; 686 } 687 mad_send_wr->newwin = newwin; 688 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) { 689 /* If no response is expected, the ACK completes the send */ 690 if (!mad_send_wr->send_buf.timeout_ms) { 691 struct ib_mad_send_wc wc; 692 693 ib_mark_mad_done(mad_send_wr); 694 spin_unlock_irqrestore(&agent->lock, flags); 695 696 wc.status = IB_WC_SUCCESS; 697 wc.vendor_err = 0; 698 wc.send_buf = &mad_send_wr->send_buf; 699 ib_mad_complete_send_wr(mad_send_wr, &wc); 700 return; 701 } 702 if (mad_send_wr->refcount == 1) 703 ib_reset_mad_timeout(mad_send_wr, 704 mad_send_wr->send_buf.timeout_ms); 705 spin_unlock_irqrestore(&agent->lock, flags); 706 ack_ds_ack(agent, mad_recv_wc); 707 return; 708 } else if (mad_send_wr->refcount == 1 && 709 mad_send_wr->seg_num < mad_send_wr->newwin && 710 mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) { 711 /* Send failure will just result in a timeout/retry */ 712 ret = send_next_seg(mad_send_wr); 713 if (ret) 714 goto out; 715 716 mad_send_wr->refcount++; 717 list_move_tail(&mad_send_wr->agent_list, 718 &mad_send_wr->mad_agent_priv->send_list); 719 } 720out: 721 spin_unlock_irqrestore(&agent->lock, flags); 722} 723 724static struct ib_mad_recv_wc * 725process_rmpp_data(struct ib_mad_agent_private *agent, 726 struct ib_mad_recv_wc *mad_recv_wc) 727{ 728 struct ib_rmpp_hdr *rmpp_hdr; 729 u8 rmpp_status; 730 731 rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr; 732 733 if (rmpp_hdr->rmpp_status) { 734 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS; 735 goto bad; 736 } 737 738 if (rmpp_hdr->seg_num == __constant_htonl(1)) { 739 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) { 740 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG; 741 goto bad; 742 } 743 return start_rmpp(agent, mad_recv_wc); 744 } else { 745 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) { 746 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG; 747 goto bad; 748 } 749 return continue_rmpp(agent, mad_recv_wc); 750 } 751bad: 752 nack_recv(agent, mad_recv_wc, rmpp_status); 753 ib_free_recv_mad(mad_recv_wc); 754 return NULL; 755} 756 757static void process_rmpp_stop(struct ib_mad_agent_private *agent, 758 struct ib_mad_recv_wc *mad_recv_wc) 759{ 760 struct ib_rmpp_mad *rmpp_mad; 761 762 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 763 764 if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) { 765 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 766 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 767 } else 768 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status); 769} 770 771static void process_rmpp_abort(struct ib_mad_agent_private *agent, 772 struct ib_mad_recv_wc *mad_recv_wc) 773{ 774 struct ib_rmpp_mad *rmpp_mad; 775 776 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 777 778 if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN || 779 rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) { 780 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 781 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 782 } else 783 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status); 784} 785 786struct ib_mad_recv_wc * 787ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent, 788 struct ib_mad_recv_wc *mad_recv_wc) 789{ 790 struct ib_rmpp_mad *rmpp_mad; 791 792 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 793 if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE)) 794 return mad_recv_wc; 795 796 if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) { 797 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV); 798 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV); 799 goto out; 800 } 801 802 switch (rmpp_mad->rmpp_hdr.rmpp_type) { 803 case IB_MGMT_RMPP_TYPE_DATA: 804 return process_rmpp_data(agent, mad_recv_wc); 805 case IB_MGMT_RMPP_TYPE_ACK: 806 process_rmpp_ack(agent, mad_recv_wc); 807 break; 808 case IB_MGMT_RMPP_TYPE_STOP: 809 process_rmpp_stop(agent, mad_recv_wc); 810 break; 811 case IB_MGMT_RMPP_TYPE_ABORT: 812 process_rmpp_abort(agent, mad_recv_wc); 813 break; 814 default: 815 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT); 816 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT); 817 break; 818 } 819out: 820 ib_free_recv_mad(mad_recv_wc); 821 return NULL; 822} 823 824static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr) 825{ 826 struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv; 827 struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad; 828 struct mad_rmpp_recv *rmpp_recv; 829 struct ib_ah_attr ah_attr; 830 unsigned long flags; 831 int newwin = 1; 832 833 if (!(mad_hdr->method & IB_MGMT_METHOD_RESP)) 834 goto out; 835 836 spin_lock_irqsave(&agent->lock, flags); 837 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { 838 if (rmpp_recv->tid != mad_hdr->tid || 839 rmpp_recv->mgmt_class != mad_hdr->mgmt_class || 840 rmpp_recv->class_version != mad_hdr->class_version || 841 (rmpp_recv->method & IB_MGMT_METHOD_RESP)) 842 continue; 843 844 if (ib_query_ah(mad_send_wr->send_buf.ah, &ah_attr)) 845 continue; 846 847 if (rmpp_recv->slid == ah_attr.dlid) { 848 newwin = rmpp_recv->repwin; 849 break; 850 } 851 } 852 spin_unlock_irqrestore(&agent->lock, flags); 853out: 854 return newwin; 855} 856 857int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr) 858{ 859 struct ib_rmpp_mad *rmpp_mad; 860 int ret; 861 862 rmpp_mad = mad_send_wr->send_buf.mad; 863 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 864 IB_MGMT_RMPP_FLAG_ACTIVE)) 865 return IB_RMPP_RESULT_UNHANDLED; 866 867 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) { 868 mad_send_wr->seg_num = 1; 869 return IB_RMPP_RESULT_INTERNAL; 870 } 871 872 mad_send_wr->newwin = init_newwin(mad_send_wr); 873 874 /* We need to wait for the final ACK even if there isn't a response */ 875 mad_send_wr->refcount += (mad_send_wr->timeout == 0); 876 ret = send_next_seg(mad_send_wr); 877 if (!ret) 878 return IB_RMPP_RESULT_CONSUMED; 879 return ret; 880} 881 882int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr, 883 struct ib_mad_send_wc *mad_send_wc) 884{ 885 struct ib_rmpp_mad *rmpp_mad; 886 int ret; 887 888 rmpp_mad = mad_send_wr->send_buf.mad; 889 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 890 IB_MGMT_RMPP_FLAG_ACTIVE)) 891 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */ 892 893 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) 894 return IB_RMPP_RESULT_INTERNAL; /* ACK, STOP, or ABORT */ 895 896 if (mad_send_wc->status != IB_WC_SUCCESS || 897 mad_send_wr->status != IB_WC_SUCCESS) 898 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */ 899 900 if (!mad_send_wr->timeout) 901 return IB_RMPP_RESULT_PROCESSED; /* Response received */ 902 903 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) { 904 mad_send_wr->timeout = 905 msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms); 906 return IB_RMPP_RESULT_PROCESSED; /* Send done */ 907 } 908 909 if (mad_send_wr->seg_num == mad_send_wr->newwin || 910 mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) 911 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */ 912 913 ret = send_next_seg(mad_send_wr); 914 if (ret) { 915 mad_send_wc->status = IB_WC_GENERAL_ERR; 916 return IB_RMPP_RESULT_PROCESSED; 917 } 918 return IB_RMPP_RESULT_CONSUMED; 919} 920 921int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr) 922{ 923 struct ib_rmpp_mad *rmpp_mad; 924 int ret; 925 926 rmpp_mad = mad_send_wr->send_buf.mad; 927 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 928 IB_MGMT_RMPP_FLAG_ACTIVE)) 929 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */ 930 931 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) 932 return IB_RMPP_RESULT_PROCESSED; 933 934 mad_send_wr->seg_num = mad_send_wr->last_ack; 935 mad_send_wr->cur_seg = mad_send_wr->last_ack_seg; 936 937 ret = send_next_seg(mad_send_wr); 938 if (ret) 939 return IB_RMPP_RESULT_PROCESSED; 940 941 return IB_RMPP_RESULT_CONSUMED; 942} 943