drivers/infiniband/core/mad_rmpp.c

   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
  39 enum rmpp_state {
  40         RMPP_STATE_ACTIVE,
  41         RMPP_STATE_TIMEOUT,
  42         RMPP_STATE_COMPLETE
  43 };
  44
  45 struct mad_rmpp_recv {
  46         struct ib_mad_agent_private *agent;
  47         struct list_head list;
  48         struct delayed_work timeout_work;
  49         struct delayed_work 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
  71 static 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
  77 static 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
  85 void 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
 108 static 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
 128 static 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
 148 static 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
 172 static 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
 198 void 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
 207 static 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
 236 static void recv_timeout_handler(struct work_struct *work)
 237 {
 238         struct mad_rmpp_recv *rmpp_recv =
 239                 container_of(work, struct mad_rmpp_recv, timeout_work.work);
 240         struct ib_mad_recv_wc *rmpp_wc;
 241         unsigned long flags;
 242
 243         spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
 244         if (rmpp_recv->state != RMPP_STATE_ACTIVE) {
 245                 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 246                 return;
 247         }
 248         rmpp_recv->state = RMPP_STATE_TIMEOUT;
 249         list_del(&rmpp_recv->list);
 250         spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 251
 252         rmpp_wc = rmpp_recv->rmpp_wc;
 253         nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L);
 254         destroy_rmpp_recv(rmpp_recv);
 255         ib_free_recv_mad(rmpp_wc);
 256 }
 257
 258 static void recv_cleanup_handler(struct work_struct *work)
 259 {
 260         struct mad_rmpp_recv *rmpp_recv =
 261                 container_of(work, struct mad_rmpp_recv, cleanup_work.work);
 262         unsigned long flags;
 263
 264         spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
 265         list_del(&rmpp_recv->list);
 266         spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 267         destroy_rmpp_recv(rmpp_recv);
 268 }
 269
 270 static struct mad_rmpp_recv *
 271 create_rmpp_recv(struct ib_mad_agent_private *agent,
 272                  struct ib_mad_recv_wc *mad_recv_wc)
 273 {
 274         struct mad_rmpp_recv *rmpp_recv;
 275         struct ib_mad_hdr *mad_hdr;
 276
 277         rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
 278         if (!rmpp_recv)
 279                 return NULL;
 280
 281         rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
 282                                              mad_recv_wc->wc,
 283                                              mad_recv_wc->recv_buf.grh,
 284                                              agent->agent.port_num);
 285         if (IS_ERR(rmpp_recv->ah))
 286                 goto error;
 287
 288         rmpp_recv->agent = agent;
 289         init_completion(&rmpp_recv->comp);
 290         INIT_DELAYED_WORK(&rmpp_recv->timeout_work, recv_timeout_handler);
 291         INIT_DELAYED_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler);
 292         spin_lock_init(&rmpp_recv->lock);
 293         rmpp_recv->state = RMPP_STATE_ACTIVE;
 294         atomic_set(&rmpp_recv->refcount, 1);
 295
 296         rmpp_recv->rmpp_wc = mad_recv_wc;
 297         rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
 298         rmpp_recv->newwin = 1;
 299         rmpp_recv->seg_num = 1;
 300         rmpp_recv->last_ack = 0;
 301         rmpp_recv->repwin = 1;
 302
 303         mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
 304         rmpp_recv->tid = mad_hdr->tid;
 305         rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
 306         rmpp_recv->slid = mad_recv_wc->wc->slid;
 307         rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
 308         rmpp_recv->class_version = mad_hdr->class_version;
 309         rmpp_recv->method  = mad_hdr->method;
 310         return rmpp_recv;
 311
 312 error:  kfree(rmpp_recv);
 313         return NULL;
 314 }
 315
 316 static struct mad_rmpp_recv *
 317 find_rmpp_recv(struct ib_mad_agent_private *agent,
 318                struct ib_mad_recv_wc *mad_recv_wc)
 319 {
 320         struct mad_rmpp_recv *rmpp_recv;
 321         struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
 322
 323         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
 324                 if (rmpp_recv->tid == mad_hdr->tid &&
 325                     rmpp_recv->src_qp == mad_recv_wc->wc->src_qp &&
 326                     rmpp_recv->slid == mad_recv_wc->wc->slid &&
 327                     rmpp_recv->mgmt_class == mad_hdr->mgmt_class &&
 328                     rmpp_recv->class_version == mad_hdr->class_version &&
 329                     rmpp_recv->method == mad_hdr->method)
 330                         return rmpp_recv;
 331         }
 332         return NULL;
 333 }
 334
 335 static struct mad_rmpp_recv *
 336 acquire_rmpp_recv(struct ib_mad_agent_private *agent,
 337                   struct ib_mad_recv_wc *mad_recv_wc)
 338 {
 339         struct mad_rmpp_recv *rmpp_recv;
 340         unsigned long flags;
 341
 342         spin_lock_irqsave(&agent->lock, flags);
 343         rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
 344         if (rmpp_recv)
 345                 atomic_inc(&rmpp_recv->refcount);
 346         spin_unlock_irqrestore(&agent->lock, flags);
 347         return rmpp_recv;
 348 }
 349
 350 static struct mad_rmpp_recv *
 351 insert_rmpp_recv(struct ib_mad_agent_private *agent,
 352                  struct mad_rmpp_recv *rmpp_recv)
 353 {
 354         struct mad_rmpp_recv *cur_rmpp_recv;
 355
 356         cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
 357         if (!cur_rmpp_recv)
 358                 list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
 359
 360         return cur_rmpp_recv;
 361 }
 362
 363 static inline int get_last_flag(struct ib_mad_recv_buf *seg)
 364 {
 365         struct ib_rmpp_mad *rmpp_mad;
 366
 367         rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
 368         return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
 369 }
 370
 371 static inline int get_seg_num(struct ib_mad_recv_buf *seg)
 372 {
 373         struct ib_rmpp_mad *rmpp_mad;
 374
 375         rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
 376         return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
 377 }
 378
 379 static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list,
 380                                                     struct ib_mad_recv_buf *seg)
 381 {
 382         if (seg->list.next == rmpp_list)
 383                 return NULL;
 384
 385         return container_of(seg->list.next, struct ib_mad_recv_buf, list);
 386 }
 387
 388 static inline int window_size(struct ib_mad_agent_private *agent)
 389 {
 390         return max(agent->qp_info->recv_queue.max_active >> 3, 1);
 391 }
 392
 393 static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list,
 394                                                   int seg_num)
 395 {
 396         struct ib_mad_recv_buf *seg_buf;
 397         int cur_seg_num;
 398
 399         list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
 400                 cur_seg_num = get_seg_num(seg_buf);
 401                 if (seg_num > cur_seg_num)
 402                         return seg_buf;
 403                 if (seg_num == cur_seg_num)
 404                         break;
 405         }
 406         return NULL;
 407 }
 408
 409 static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
 410                            struct ib_mad_recv_buf *new_buf)
 411 {
 412         struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
 413
 414         while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
 415                 rmpp_recv->cur_seg_buf = new_buf;
 416                 rmpp_recv->seg_num++;
 417                 new_buf = get_next_seg(rmpp_list, new_buf);
 418         }
 419 }
 420
 421 static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
 422 {
 423         struct ib_rmpp_mad *rmpp_mad;
 424         int hdr_size, data_size, pad;
 425
 426         rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
 427
 428         hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
 429         data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
 430         pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
 431         if (pad > IB_MGMT_RMPP_DATA || pad < 0)
 432                 pad = 0;
 433
 434         return hdr_size + rmpp_recv->seg_num * data_size - pad;
 435 }
 436
 437 static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
 438 {
 439         struct ib_mad_recv_wc *rmpp_wc;
 440
 441         ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
 442         if (rmpp_recv->seg_num > 1)
 443                 cancel_delayed_work(&rmpp_recv->timeout_work);
 444
 445         rmpp_wc = rmpp_recv->rmpp_wc;
 446         rmpp_wc->mad_len = get_mad_len(rmpp_recv);
 447         /* 10 seconds until we can find the packet lifetime */
 448         queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
 449                            &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
 450         return rmpp_wc;
 451 }
 452
 453 static struct ib_mad_recv_wc *
 454 continue_rmpp(struct ib_mad_agent_private *agent,
 455               struct ib_mad_recv_wc *mad_recv_wc)
 456 {
 457         struct mad_rmpp_recv *rmpp_recv;
 458         struct ib_mad_recv_buf *prev_buf;
 459         struct ib_mad_recv_wc *done_wc;
 460         int seg_num;
 461         unsigned long flags;
 462
 463         rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
 464         if (!rmpp_recv)
 465                 goto drop1;
 466
 467         seg_num = get_seg_num(&mad_recv_wc->recv_buf);
 468
 469         spin_lock_irqsave(&rmpp_recv->lock, flags);
 470         if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
 471             (seg_num > rmpp_recv->newwin))
 472                 goto drop3;
 473
 474         if ((seg_num <= rmpp_recv->last_ack) ||
 475             (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
 476                 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 477                 ack_recv(rmpp_recv, mad_recv_wc);
 478                 goto drop2;
 479         }
 480
 481         prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
 482         if (!prev_buf)
 483                 goto drop3;
 484
 485         done_wc = NULL;
 486         list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
 487         if (rmpp_recv->cur_seg_buf == prev_buf) {
 488                 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
 489                 if (get_last_flag(rmpp_recv->cur_seg_buf)) {
 490                         rmpp_recv->state = RMPP_STATE_COMPLETE;
 491                         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 492                         done_wc = complete_rmpp(rmpp_recv);
 493                         goto out;
 494                 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
 495                         rmpp_recv->newwin += window_size(agent);
 496                         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 497                         ack_recv(rmpp_recv, mad_recv_wc);
 498                         goto out;
 499                 }
 500         }
 501         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 502 out:
 503         deref_rmpp_recv(rmpp_recv);
 504         return done_wc;
 505
 506 drop3:  spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 507 drop2:  deref_rmpp_recv(rmpp_recv);
 508 drop1:  ib_free_recv_mad(mad_recv_wc);
 509         return NULL;
 510 }
 511
 512 static struct ib_mad_recv_wc *
 513 start_rmpp(struct ib_mad_agent_private *agent,
 514            struct ib_mad_recv_wc *mad_recv_wc)
 515 {
 516         struct mad_rmpp_recv *rmpp_recv;
 517         unsigned long flags;
 518
 519         rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
 520         if (!rmpp_recv) {
 521                 ib_free_recv_mad(mad_recv_wc);
 522                 return NULL;
 523         }
 524
 525         spin_lock_irqsave(&agent->lock, flags);
 526         if (insert_rmpp_recv(agent, rmpp_recv)) {
 527                 spin_unlock_irqrestore(&agent->lock, flags);
 528                 /* duplicate first MAD */
 529                 destroy_rmpp_recv(rmpp_recv);
 530                 return continue_rmpp(agent, mad_recv_wc);
 531         }
 532         atomic_inc(&rmpp_recv->refcount);
 533
 534         if (get_last_flag(&mad_recv_wc->recv_buf)) {
 535                 rmpp_recv->state = RMPP_STATE_COMPLETE;
 536                 spin_unlock_irqrestore(&agent->lock, flags);
 537                 complete_rmpp(rmpp_recv);
 538         } else {
 539                 spin_unlock_irqrestore(&agent->lock, flags);
 540                 /* 40 seconds until we can find the packet lifetimes */
 541                 queue_delayed_work(agent->qp_info->port_priv->wq,
 542                                    &rmpp_recv->timeout_work,
 543                                    msecs_to_jiffies(40000));
 544                 rmpp_recv->newwin += window_size(agent);
 545                 ack_recv(rmpp_recv, mad_recv_wc);
 546                 mad_recv_wc = NULL;
 547         }
 548         deref_rmpp_recv(rmpp_recv);
 549         return mad_recv_wc;
 550 }
 551
 552 static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
 553 {
 554         struct ib_rmpp_mad *rmpp_mad;
 555         int timeout;
 556         u32 paylen = 0;
 557
 558         rmpp_mad = mad_send_wr->send_buf.mad;
 559         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 560         rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num);
 561
 562         if (mad_send_wr->seg_num == 1) {
 563                 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
 564                 paylen = mad_send_wr->send_buf.seg_count * IB_MGMT_RMPP_DATA -
 565                          mad_send_wr->pad;
 566         }
 567
 568         if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) {
 569                 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
 570                 paylen = IB_MGMT_RMPP_DATA - mad_send_wr->pad;
 571         }
 572         rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
 573
 574         /* 2 seconds for an ACK until we can find the packet lifetime */
 575         timeout = mad_send_wr->send_buf.timeout_ms;
 576         if (!timeout || timeout > 2000)
 577                 mad_send_wr->timeout = msecs_to_jiffies(2000);
 578
 579         return ib_send_mad(mad_send_wr);
 580 }
 581
 582 static void abort_send(struct ib_mad_agent_private *agent,
 583                        struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status)
 584 {
 585         struct ib_mad_send_wr_private *mad_send_wr;
 586         struct ib_mad_send_wc wc;
 587         unsigned long flags;
 588
 589         spin_lock_irqsave(&agent->lock, flags);
 590         mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
 591         if (!mad_send_wr)
 592                 goto out;       /* Unmatched send */
 593
 594         if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
 595             (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
 596                 goto out;       /* Send is already done */
 597
 598         ib_mark_mad_done(mad_send_wr);
 599         spin_unlock_irqrestore(&agent->lock, flags);
 600
 601         wc.status = IB_WC_REM_ABORT_ERR;
 602         wc.vendor_err = rmpp_status;
 603         wc.send_buf = &mad_send_wr->send_buf;
 604         ib_mad_complete_send_wr(mad_send_wr, &wc);
 605         return;
 606 out:
 607         spin_unlock_irqrestore(&agent->lock, flags);
 608 }
 609
 610 static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr,
 611                                    int seg_num)
 612 {
 613         struct list_head *list;
 614
 615         wr->last_ack = seg_num;
 616         list = &wr->last_ack_seg->list;
 617         list_for_each_entry(wr->last_ack_seg, list, list)
 618                 if (wr->last_ack_seg->num == seg_num)
 619                         break;
 620 }
 621
 622 static void process_ds_ack(struct ib_mad_agent_private *agent,
 623                            struct ib_mad_recv_wc *mad_recv_wc, int newwin)
 624 {
 625         struct mad_rmpp_recv *rmpp_recv;
 626
 627         rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
 628         if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE)
 629                 rmpp_recv->repwin = newwin;
 630 }
 631
 632 static void process_rmpp_ack(struct ib_mad_agent_private *agent,
 633                              struct ib_mad_recv_wc *mad_recv_wc)
 634 {
 635         struct ib_mad_send_wr_private *mad_send_wr;
 636         struct ib_rmpp_mad *rmpp_mad;
 637         unsigned long flags;
 638         int seg_num, newwin, ret;
 639
 640         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 641         if (rmpp_mad->rmpp_hdr.rmpp_status) {
 642                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 643                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 644                 return;
 645         }
 646
 647         seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
 648         newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
 649         if (newwin < seg_num) {
 650                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
 651                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
 652                 return;
 653         }
 654
 655         spin_lock_irqsave(&agent->lock, flags);
 656         mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
 657         if (!mad_send_wr) {
 658                 if (!seg_num)
 659                         process_ds_ack(agent, mad_recv_wc, newwin);
 660                 goto out;       /* Unmatched or DS RMPP ACK */
 661         }
 662
 663         if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) &&
 664             (mad_send_wr->timeout)) {
 665                 spin_unlock_irqrestore(&agent->lock, flags);
 666                 ack_ds_ack(agent, mad_recv_wc);
 667                 return;         /* Repeated ACK for DS RMPP transaction */
 668         }
 669
 670         if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
 671             (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
 672                 goto out;       /* Send is already done */
 673
 674         if (seg_num > mad_send_wr->send_buf.seg_count ||
 675             seg_num > mad_send_wr->newwin) {
 676                 spin_unlock_irqrestore(&agent->lock, flags);
 677                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
 678                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
 679                 return;
 680         }
 681
 682         if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
 683                 goto out;       /* Old ACK */
 684
 685         if (seg_num > mad_send_wr->last_ack) {
 686                 adjust_last_ack(mad_send_wr, seg_num);
 687                 mad_send_wr->retries = mad_send_wr->send_buf.retries;
 688         }
 689         mad_send_wr->newwin = newwin;
 690         if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
 691                 /* If no response is expected, the ACK completes the send */
 692                 if (!mad_send_wr->send_buf.timeout_ms) {
 693                         struct ib_mad_send_wc wc;
 694
 695                         ib_mark_mad_done(mad_send_wr);
 696                         spin_unlock_irqrestore(&agent->lock, flags);
 697
 698                         wc.status = IB_WC_SUCCESS;
 699                         wc.vendor_err = 0;
 700                         wc.send_buf = &mad_send_wr->send_buf;
 701                         ib_mad_complete_send_wr(mad_send_wr, &wc);
 702                         return;
 703                 }
 704                 if (mad_send_wr->refcount == 1)
 705                         ib_reset_mad_timeout(mad_send_wr,
 706                                              mad_send_wr->send_buf.timeout_ms);
 707                 spin_unlock_irqrestore(&agent->lock, flags);
 708                 ack_ds_ack(agent, mad_recv_wc);
 709                 return;
 710         } else if (mad_send_wr->refcount == 1 &&
 711                    mad_send_wr->seg_num < mad_send_wr->newwin &&
 712                    mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) {
 713                 /* Send failure will just result in a timeout/retry */
 714                 ret = send_next_seg(mad_send_wr);
 715                 if (ret)
 716                         goto out;
 717
 718                 mad_send_wr->refcount++;
 719                 list_move_tail(&mad_send_wr->agent_list,
 720                               &mad_send_wr->mad_agent_priv->send_list);
 721         }
 722 out:
 723         spin_unlock_irqrestore(&agent->lock, flags);
 724 }
 725
 726 static struct ib_mad_recv_wc *
 727 process_rmpp_data(struct ib_mad_agent_private *agent,
 728                   struct ib_mad_recv_wc *mad_recv_wc)
 729 {
 730         struct ib_rmpp_hdr *rmpp_hdr;
 731         u8 rmpp_status;
 732
 733         rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;
 734
 735         if (rmpp_hdr->rmpp_status) {
 736                 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
 737                 goto bad;
 738         }
 739
 740         if (rmpp_hdr->seg_num == __constant_htonl(1)) {
 741                 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) {
 742                         rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
 743                         goto bad;
 744                 }
 745                 return start_rmpp(agent, mad_recv_wc);
 746         } else {
 747                 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
 748                         rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
 749                         goto bad;
 750                 }
 751                 return continue_rmpp(agent, mad_recv_wc);
 752         }
 753 bad:
 754         nack_recv(agent, mad_recv_wc, rmpp_status);
 755         ib_free_recv_mad(mad_recv_wc);
 756         return NULL;
 757 }
 758
 759 static void process_rmpp_stop(struct ib_mad_agent_private *agent,
 760                               struct ib_mad_recv_wc *mad_recv_wc)
 761 {
 762         struct ib_rmpp_mad *rmpp_mad;
 763
 764         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 765
 766         if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
 767                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 768                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 769         } else
 770                 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
 771 }
 772
 773 static void process_rmpp_abort(struct ib_mad_agent_private *agent,
 774                                struct ib_mad_recv_wc *mad_recv_wc)
 775 {
 776         struct ib_rmpp_mad *rmpp_mad;
 777
 778         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 779
 780         if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
 781             rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
 782                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 783                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 784         } else
 785                 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
 786 }
 787
 788 struct ib_mad_recv_wc *
 789 ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
 790                         struct ib_mad_recv_wc *mad_recv_wc)
 791 {
 792         struct ib_rmpp_mad *rmpp_mad;
 793
 794         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 795         if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
 796                 return mad_recv_wc;
 797
 798         if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
 799                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
 800                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
 801                 goto out;
 802         }
 803
 804         switch (rmpp_mad->rmpp_hdr.rmpp_type) {
 805         case IB_MGMT_RMPP_TYPE_DATA:
 806                 return process_rmpp_data(agent, mad_recv_wc);
 807         case IB_MGMT_RMPP_TYPE_ACK:
 808                 process_rmpp_ack(agent, mad_recv_wc);
 809                 break;
 810         case IB_MGMT_RMPP_TYPE_STOP:
 811                 process_rmpp_stop(agent, mad_recv_wc);
 812                 break;
 813         case IB_MGMT_RMPP_TYPE_ABORT:
 814                 process_rmpp_abort(agent, mad_recv_wc);
 815                 break;
 816         default:
 817                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
 818                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
 819                 break;
 820         }
 821 out:
 822         ib_free_recv_mad(mad_recv_wc);
 823         return NULL;
 824 }
 825
 826 static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr)
 827 {
 828         struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv;
 829         struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad;
 830         struct mad_rmpp_recv *rmpp_recv;
 831         struct ib_ah_attr ah_attr;
 832         unsigned long flags;
 833         int newwin = 1;
 834
 835         if (!(mad_hdr->method & IB_MGMT_METHOD_RESP))
 836                 goto out;
 837
 838         spin_lock_irqsave(&agent->lock, flags);
 839         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
 840                 if (rmpp_recv->tid != mad_hdr->tid ||
 841                     rmpp_recv->mgmt_class != mad_hdr->mgmt_class ||
 842                     rmpp_recv->class_version != mad_hdr->class_version ||
 843                     (rmpp_recv->method & IB_MGMT_METHOD_RESP))
 844                         continue;
 845
 846                 if (ib_query_ah(mad_send_wr->send_buf.ah, &ah_attr))
 847                         continue;
 848
 849                 if (rmpp_recv->slid == ah_attr.dlid) {
 850                         newwin = rmpp_recv->repwin;
 851                         break;
 852                 }
 853         }
 854         spin_unlock_irqrestore(&agent->lock, flags);
 855 out:
 856         return newwin;
 857 }
 858
 859 int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
 860 {
 861         struct ib_rmpp_mad *rmpp_mad;
 862         int ret;
 863
 864         rmpp_mad = mad_send_wr->send_buf.mad;
 865         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 866               IB_MGMT_RMPP_FLAG_ACTIVE))
 867                 return IB_RMPP_RESULT_UNHANDLED;
 868
 869         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) {
 870                 mad_send_wr->seg_num = 1;
 871                 return IB_RMPP_RESULT_INTERNAL;
 872         }
 873
 874         mad_send_wr->newwin = init_newwin(mad_send_wr);
 875
 876         /* We need to wait for the final ACK even if there isn't a response */
 877         mad_send_wr->refcount += (mad_send_wr->timeout == 0);
 878         ret = send_next_seg(mad_send_wr);
 879         if (!ret)
 880                 return IB_RMPP_RESULT_CONSUMED;
 881         return ret;
 882 }
 883
 884 int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
 885                             struct ib_mad_send_wc *mad_send_wc)
 886 {
 887         struct ib_rmpp_mad *rmpp_mad;
 888         int ret;
 889
 890         rmpp_mad = mad_send_wr->send_buf.mad;
 891         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 892               IB_MGMT_RMPP_FLAG_ACTIVE))
 893                 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
 894
 895         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
 896                 return IB_RMPP_RESULT_INTERNAL;  /* ACK, STOP, or ABORT */
 897
 898         if (mad_send_wc->status != IB_WC_SUCCESS ||
 899             mad_send_wr->status != IB_WC_SUCCESS)
 900                 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
 901
 902         if (!mad_send_wr->timeout)
 903                 return IB_RMPP_RESULT_PROCESSED; /* Response received */
 904
 905         if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
 906                 mad_send_wr->timeout =
 907                         msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
 908                 return IB_RMPP_RESULT_PROCESSED; /* Send done */
 909         }
 910
 911         if (mad_send_wr->seg_num == mad_send_wr->newwin ||
 912             mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count)
 913                 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
 914
 915         ret = send_next_seg(mad_send_wr);
 916         if (ret) {
 917                 mad_send_wc->status = IB_WC_GENERAL_ERR;
 918                 return IB_RMPP_RESULT_PROCESSED;
 919         }
 920         return IB_RMPP_RESULT_CONSUMED;
 921 }
 922
 923 int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
 924 {
 925         struct ib_rmpp_mad *rmpp_mad;
 926         int ret;
 927
 928         rmpp_mad = mad_send_wr->send_buf.mad;
 929         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 930               IB_MGMT_RMPP_FLAG_ACTIVE))
 931                 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
 932
 933         if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count)
 934                 return IB_RMPP_RESULT_PROCESSED;
 935
 936         mad_send_wr->seg_num = mad_send_wr->last_ack;
 937         mad_send_wr->cur_seg = mad_send_wr->last_ack_seg;
 938
 939         ret = send_next_seg(mad_send_wr);
 940         if (ret)
 941                 return IB_RMPP_RESULT_PROCESSED;
 942
 943         return IB_RMPP_RESULT_CONSUMED;
 944 }