drivers/infiniband/core/mad_rmpp.c

   1 /*
   2  * Copyright (c) 2005 Intel Inc. All rights reserved.
   3  * Copyright (c) 2005 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 <linux/dma-mapping.h>
  37
  38 #include "mad_priv.h"
  39 #include "mad_rmpp.h"
  40
  41 enum rmpp_state {
  42         RMPP_STATE_ACTIVE,
  43         RMPP_STATE_TIMEOUT,
  44         RMPP_STATE_COMPLETE
  45 };
  46
  47 struct mad_rmpp_recv {
  48         struct ib_mad_agent_private *agent;
  49         struct list_head list;
  50         struct work_struct timeout_work;
  51         struct work_struct cleanup_work;
  52         wait_queue_head_t wait;
  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
  64         __be64 tid;
  65         u32 src_qp;
  66         u16 slid;
  67         u8 mgmt_class;
  68         u8 class_version;
  69         u8 method;
  70 };
  71
  72 static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
  73 {
  74         atomic_dec(&rmpp_recv->refcount);
  75         wait_event(rmpp_recv->wait, !atomic_read(&rmpp_recv->refcount));
  76         ib_destroy_ah(rmpp_recv->ah);
  77         kfree(rmpp_recv);
  78 }
  79
  80 void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent)
  81 {
  82         struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv;
  83         unsigned long flags;
  84
  85         spin_lock_irqsave(&agent->lock, flags);
  86         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
  87                 cancel_delayed_work(&rmpp_recv->timeout_work);
  88                 cancel_delayed_work(&rmpp_recv->cleanup_work);
  89         }
  90         spin_unlock_irqrestore(&agent->lock, flags);
  91
  92         flush_workqueue(agent->qp_info->port_priv->wq);
  93
  94         list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv,
  95                                  &agent->rmpp_list, list) {
  96                 list_del(&rmpp_recv->list);
  97                 if (rmpp_recv->state != RMPP_STATE_COMPLETE)
  98                         ib_free_recv_mad(rmpp_recv->rmpp_wc);
  99                 destroy_rmpp_recv(rmpp_recv);
 100         }
 101 }
 102
 103 static int data_offset(u8 mgmt_class)
 104 {
 105         if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
 106                 return IB_MGMT_SA_HDR;
 107         else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 108                  (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
 109                 return IB_MGMT_VENDOR_HDR;
 110         else
 111                 return IB_MGMT_RMPP_HDR;
 112 }
 113
 114 static void format_ack(struct ib_mad_send_buf *msg,
 115                        struct ib_rmpp_mad *data,
 116                        struct mad_rmpp_recv *rmpp_recv)
 117 {
 118         struct ib_rmpp_mad *ack = msg->mad;
 119         unsigned long flags;
 120
 121         memcpy(ack, &data->mad_hdr, msg->hdr_len);
 122
 123         ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
 124         ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK;
 125         ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 126
 127         spin_lock_irqsave(&rmpp_recv->lock, flags);
 128         rmpp_recv->last_ack = rmpp_recv->seg_num;
 129         ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num);
 130         ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin);
 131         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 132 }
 133
 134 static void ack_recv(struct mad_rmpp_recv *rmpp_recv,
 135                      struct ib_mad_recv_wc *recv_wc)
 136 {
 137         struct ib_mad_send_buf *msg;
 138         int ret, hdr_len;
 139
 140         hdr_len = data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
 141         msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp,
 142                                  recv_wc->wc->pkey_index, 1, hdr_len,
 143                                  0, GFP_KERNEL);
 144         if (!msg)
 145                 return;
 146
 147         format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv);
 148         msg->ah = rmpp_recv->ah;
 149         ret = ib_post_send_mad(msg, NULL);
 150         if (ret)
 151                 ib_free_send_mad(msg);
 152 }
 153
 154 static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent,
 155                                                   struct ib_mad_recv_wc *recv_wc)
 156 {
 157         struct ib_mad_send_buf *msg;
 158         struct ib_ah *ah;
 159         int hdr_len;
 160
 161         ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc,
 162                                   recv_wc->recv_buf.grh, agent->port_num);
 163         if (IS_ERR(ah))
 164                 return (void *) ah;
 165
 166         hdr_len = data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
 167         msg = ib_create_send_mad(agent, recv_wc->wc->src_qp,
 168                                  recv_wc->wc->pkey_index, 1,
 169                                  hdr_len, 0, GFP_KERNEL);
 170         if (IS_ERR(msg))
 171                 ib_destroy_ah(ah);
 172         else
 173                 msg->ah = ah;
 174
 175         return msg;
 176 }
 177
 178 void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc)
 179 {
 180         struct ib_rmpp_mad *rmpp_mad = mad_send_wc->send_buf->mad;
 181
 182         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_ACK)
 183                 ib_destroy_ah(mad_send_wc->send_buf->ah);
 184         ib_free_send_mad(mad_send_wc->send_buf);
 185 }
 186
 187 static void nack_recv(struct ib_mad_agent_private *agent,
 188                       struct ib_mad_recv_wc *recv_wc, u8 rmpp_status)
 189 {
 190         struct ib_mad_send_buf *msg;
 191         struct ib_rmpp_mad *rmpp_mad;
 192         int ret;
 193
 194         msg = alloc_response_msg(&agent->agent, recv_wc);
 195         if (IS_ERR(msg))
 196                 return;
 197
 198         rmpp_mad = msg->mad;
 199         memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
 200
 201         rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
 202         rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION;
 203         rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT;
 204         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 205         rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status;
 206         rmpp_mad->rmpp_hdr.seg_num = 0;
 207         rmpp_mad->rmpp_hdr.paylen_newwin = 0;
 208
 209         ret = ib_post_send_mad(msg, NULL);
 210         if (ret) {
 211                 ib_destroy_ah(msg->ah);
 212                 ib_free_send_mad(msg);
 213         }
 214 }
 215
 216 static void recv_timeout_handler(void *data)
 217 {
 218         struct mad_rmpp_recv *rmpp_recv = data;
 219         struct ib_mad_recv_wc *rmpp_wc;
 220         unsigned long flags;
 221
 222         spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
 223         if (rmpp_recv->state != RMPP_STATE_ACTIVE) {
 224                 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 225                 return;
 226         }
 227         rmpp_recv->state = RMPP_STATE_TIMEOUT;
 228         list_del(&rmpp_recv->list);
 229         spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 230
 231         rmpp_wc = rmpp_recv->rmpp_wc;
 232         nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L);
 233         destroy_rmpp_recv(rmpp_recv);
 234         ib_free_recv_mad(rmpp_wc);
 235 }
 236
 237 static void recv_cleanup_handler(void *data)
 238 {
 239         struct mad_rmpp_recv *rmpp_recv = data;
 240         unsigned long flags;
 241
 242         spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
 243         list_del(&rmpp_recv->list);
 244         spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 245         destroy_rmpp_recv(rmpp_recv);
 246 }
 247
 248 static struct mad_rmpp_recv *
 249 create_rmpp_recv(struct ib_mad_agent_private *agent,
 250                  struct ib_mad_recv_wc *mad_recv_wc)
 251 {
 252         struct mad_rmpp_recv *rmpp_recv;
 253         struct ib_mad_hdr *mad_hdr;
 254
 255         rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
 256         if (!rmpp_recv)
 257                 return NULL;
 258
 259         rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
 260                                              mad_recv_wc->wc,
 261                                              mad_recv_wc->recv_buf.grh,
 262                                              agent->agent.port_num);
 263         if (IS_ERR(rmpp_recv->ah))
 264                 goto error;
 265
 266         rmpp_recv->agent = agent;
 267         init_waitqueue_head(&rmpp_recv->wait);
 268         INIT_WORK(&rmpp_recv->timeout_work, recv_timeout_handler, rmpp_recv);
 269         INIT_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler, rmpp_recv);
 270         spin_lock_init(&rmpp_recv->lock);
 271         rmpp_recv->state = RMPP_STATE_ACTIVE;
 272         atomic_set(&rmpp_recv->refcount, 1);
 273
 274         rmpp_recv->rmpp_wc = mad_recv_wc;
 275         rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
 276         rmpp_recv->newwin = 1;
 277         rmpp_recv->seg_num = 1;
 278         rmpp_recv->last_ack = 0;
 279
 280         mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
 281         rmpp_recv->tid = mad_hdr->tid;
 282         rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
 283         rmpp_recv->slid = mad_recv_wc->wc->slid;
 284         rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
 285         rmpp_recv->class_version = mad_hdr->class_version;
 286         rmpp_recv->method  = mad_hdr->method;
 287         return rmpp_recv;
 288
 289 error:  kfree(rmpp_recv);
 290         return NULL;
 291 }
 292
 293 static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
 294 {
 295         if (atomic_dec_and_test(&rmpp_recv->refcount))
 296                 wake_up(&rmpp_recv->wait);
 297 }
 298
 299 static struct mad_rmpp_recv *
 300 find_rmpp_recv(struct ib_mad_agent_private *agent,
 301                struct ib_mad_recv_wc *mad_recv_wc)
 302 {
 303         struct mad_rmpp_recv *rmpp_recv;
 304         struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
 305
 306         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
 307                 if (rmpp_recv->tid == mad_hdr->tid &&
 308                     rmpp_recv->src_qp == mad_recv_wc->wc->src_qp &&
 309                     rmpp_recv->slid == mad_recv_wc->wc->slid &&
 310                     rmpp_recv->mgmt_class == mad_hdr->mgmt_class &&
 311                     rmpp_recv->class_version == mad_hdr->class_version &&
 312                     rmpp_recv->method == mad_hdr->method)
 313                         return rmpp_recv;
 314         }
 315         return NULL;
 316 }
 317
 318 static struct mad_rmpp_recv *
 319 acquire_rmpp_recv(struct ib_mad_agent_private *agent,
 320                   struct ib_mad_recv_wc *mad_recv_wc)
 321 {
 322         struct mad_rmpp_recv *rmpp_recv;
 323         unsigned long flags;
 324
 325         spin_lock_irqsave(&agent->lock, flags);
 326         rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
 327         if (rmpp_recv)
 328                 atomic_inc(&rmpp_recv->refcount);
 329         spin_unlock_irqrestore(&agent->lock, flags);
 330         return rmpp_recv;
 331 }
 332
 333 static struct mad_rmpp_recv *
 334 insert_rmpp_recv(struct ib_mad_agent_private *agent,
 335                  struct mad_rmpp_recv *rmpp_recv)
 336 {
 337         struct mad_rmpp_recv *cur_rmpp_recv;
 338
 339         cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
 340         if (!cur_rmpp_recv)
 341                 list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
 342
 343         return cur_rmpp_recv;
 344 }
 345
 346 static inline int get_last_flag(struct ib_mad_recv_buf *seg)
 347 {
 348         struct ib_rmpp_mad *rmpp_mad;
 349
 350         rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
 351         return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
 352 }
 353
 354 static inline int get_seg_num(struct ib_mad_recv_buf *seg)
 355 {
 356         struct ib_rmpp_mad *rmpp_mad;
 357
 358         rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
 359         return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
 360 }
 361
 362 static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list,
 363                                                     struct ib_mad_recv_buf *seg)
 364 {
 365         if (seg->list.next == rmpp_list)
 366                 return NULL;
 367
 368         return container_of(seg->list.next, struct ib_mad_recv_buf, list);
 369 }
 370
 371 static inline int window_size(struct ib_mad_agent_private *agent)
 372 {
 373         return max(agent->qp_info->recv_queue.max_active >> 3, 1);
 374 }
 375
 376 static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list,
 377                                                   int seg_num)
 378 {
 379         struct ib_mad_recv_buf *seg_buf;
 380         int cur_seg_num;
 381
 382         list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
 383                 cur_seg_num = get_seg_num(seg_buf);
 384                 if (seg_num > cur_seg_num)
 385                         return seg_buf;
 386                 if (seg_num == cur_seg_num)
 387                         break;
 388         }
 389         return NULL;
 390 }
 391
 392 static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
 393                            struct ib_mad_recv_buf *new_buf)
 394 {
 395         struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
 396
 397         while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
 398                 rmpp_recv->cur_seg_buf = new_buf;
 399                 rmpp_recv->seg_num++;
 400                 new_buf = get_next_seg(rmpp_list, new_buf);
 401         }
 402 }
 403
 404 static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
 405 {
 406         struct ib_rmpp_mad *rmpp_mad;
 407         int hdr_size, data_size, pad;
 408
 409         rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
 410
 411         hdr_size = data_offset(rmpp_mad->mad_hdr.mgmt_class);
 412         data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
 413         pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
 414         if (pad > IB_MGMT_RMPP_DATA || pad < 0)
 415                 pad = 0;
 416
 417         return hdr_size + rmpp_recv->seg_num * data_size - pad;
 418 }
 419
 420 static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
 421 {
 422         struct ib_mad_recv_wc *rmpp_wc;
 423
 424         ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
 425         if (rmpp_recv->seg_num > 1)
 426                 cancel_delayed_work(&rmpp_recv->timeout_work);
 427
 428         rmpp_wc = rmpp_recv->rmpp_wc;
 429         rmpp_wc->mad_len = get_mad_len(rmpp_recv);
 430         /* 10 seconds until we can find the packet lifetime */
 431         queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
 432                            &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
 433         return rmpp_wc;
 434 }
 435
 436 static struct ib_mad_recv_wc *
 437 continue_rmpp(struct ib_mad_agent_private *agent,
 438               struct ib_mad_recv_wc *mad_recv_wc)
 439 {
 440         struct mad_rmpp_recv *rmpp_recv;
 441         struct ib_mad_recv_buf *prev_buf;
 442         struct ib_mad_recv_wc *done_wc;
 443         int seg_num;
 444         unsigned long flags;
 445
 446         rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
 447         if (!rmpp_recv)
 448                 goto drop1;
 449
 450         seg_num = get_seg_num(&mad_recv_wc->recv_buf);
 451
 452         spin_lock_irqsave(&rmpp_recv->lock, flags);
 453         if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
 454             (seg_num > rmpp_recv->newwin))
 455                 goto drop3;
 456
 457         if ((seg_num <= rmpp_recv->last_ack) ||
 458             (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
 459                 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 460                 ack_recv(rmpp_recv, mad_recv_wc);
 461                 goto drop2;
 462         }
 463
 464         prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
 465         if (!prev_buf)
 466                 goto drop3;
 467
 468         done_wc = NULL;
 469         list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
 470         if (rmpp_recv->cur_seg_buf == prev_buf) {
 471                 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
 472                 if (get_last_flag(rmpp_recv->cur_seg_buf)) {
 473                         rmpp_recv->state = RMPP_STATE_COMPLETE;
 474                         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 475                         done_wc = complete_rmpp(rmpp_recv);
 476                         goto out;
 477                 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
 478                         rmpp_recv->newwin += window_size(agent);
 479                         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 480                         ack_recv(rmpp_recv, mad_recv_wc);
 481                         goto out;
 482                 }
 483         }
 484         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 485 out:
 486         deref_rmpp_recv(rmpp_recv);
 487         return done_wc;
 488
 489 drop3:  spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 490 drop2:  deref_rmpp_recv(rmpp_recv);
 491 drop1:  ib_free_recv_mad(mad_recv_wc);
 492         return NULL;
 493 }
 494
 495 static struct ib_mad_recv_wc *
 496 start_rmpp(struct ib_mad_agent_private *agent,
 497            struct ib_mad_recv_wc *mad_recv_wc)
 498 {
 499         struct mad_rmpp_recv *rmpp_recv;
 500         unsigned long flags;
 501
 502         rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
 503         if (!rmpp_recv) {
 504                 ib_free_recv_mad(mad_recv_wc);
 505                 return NULL;
 506         }
 507
 508         spin_lock_irqsave(&agent->lock, flags);
 509         if (insert_rmpp_recv(agent, rmpp_recv)) {
 510                 spin_unlock_irqrestore(&agent->lock, flags);
 511                 /* duplicate first MAD */
 512                 destroy_rmpp_recv(rmpp_recv);
 513                 return continue_rmpp(agent, mad_recv_wc);
 514         }
 515         atomic_inc(&rmpp_recv->refcount);
 516
 517         if (get_last_flag(&mad_recv_wc->recv_buf)) {
 518                 rmpp_recv->state = RMPP_STATE_COMPLETE;
 519                 spin_unlock_irqrestore(&agent->lock, flags);
 520                 complete_rmpp(rmpp_recv);
 521         } else {
 522                 spin_unlock_irqrestore(&agent->lock, flags);
 523                 /* 40 seconds until we can find the packet lifetimes */
 524                 queue_delayed_work(agent->qp_info->port_priv->wq,
 525                                    &rmpp_recv->timeout_work,
 526                                    msecs_to_jiffies(40000));
 527                 rmpp_recv->newwin += window_size(agent);
 528                 ack_recv(rmpp_recv, mad_recv_wc);
 529                 mad_recv_wc = NULL;
 530         }
 531         deref_rmpp_recv(rmpp_recv);
 532         return mad_recv_wc;
 533 }
 534
 535 static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
 536 {
 537         struct ib_rmpp_mad *rmpp_mad;
 538         int timeout;
 539         u32 paylen = 0;
 540
 541         rmpp_mad = mad_send_wr->send_buf.mad;
 542         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 543         rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num);
 544
 545         if (mad_send_wr->seg_num == 1) {
 546                 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
 547                 paylen = mad_send_wr->send_buf.seg_count * IB_MGMT_RMPP_DATA -
 548                          mad_send_wr->pad;
 549         }
 550
 551         if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) {
 552                 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
 553                 paylen = IB_MGMT_RMPP_DATA - mad_send_wr->pad;
 554         }
 555         rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
 556
 557         /* 2 seconds for an ACK until we can find the packet lifetime */
 558         timeout = mad_send_wr->send_buf.timeout_ms;
 559         if (!timeout || timeout > 2000)
 560                 mad_send_wr->timeout = msecs_to_jiffies(2000);
 561
 562         return ib_send_mad(mad_send_wr);
 563 }
 564
 565 static void abort_send(struct ib_mad_agent_private *agent, __be64 tid,
 566                        u8 rmpp_status)
 567 {
 568         struct ib_mad_send_wr_private *mad_send_wr;
 569         struct ib_mad_send_wc wc;
 570         unsigned long flags;
 571
 572         spin_lock_irqsave(&agent->lock, flags);
 573         mad_send_wr = ib_find_send_mad(agent, tid);
 574         if (!mad_send_wr)
 575                 goto out;       /* Unmatched send */
 576
 577         if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
 578             (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
 579                 goto out;       /* Send is already done */
 580
 581         ib_mark_mad_done(mad_send_wr);
 582         spin_unlock_irqrestore(&agent->lock, flags);
 583
 584         wc.status = IB_WC_REM_ABORT_ERR;
 585         wc.vendor_err = rmpp_status;
 586         wc.send_buf = &mad_send_wr->send_buf;
 587         ib_mad_complete_send_wr(mad_send_wr, &wc);
 588         return;
 589 out:
 590         spin_unlock_irqrestore(&agent->lock, flags);
 591 }
 592
 593 static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr,
 594                                    int seg_num)
 595 {
 596         struct list_head *list;
 597
 598         wr->last_ack = seg_num;
 599         list = &wr->last_ack_seg->list;
 600         list_for_each_entry(wr->last_ack_seg, list, list)
 601                 if (wr->last_ack_seg->num == seg_num)
 602                         break;
 603 }
 604
 605 static void process_rmpp_ack(struct ib_mad_agent_private *agent,
 606                              struct ib_mad_recv_wc *mad_recv_wc)
 607 {
 608         struct ib_mad_send_wr_private *mad_send_wr;
 609         struct ib_rmpp_mad *rmpp_mad;
 610         unsigned long flags;
 611         int seg_num, newwin, ret;
 612
 613         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 614         if (rmpp_mad->rmpp_hdr.rmpp_status) {
 615                 abort_send(agent, rmpp_mad->mad_hdr.tid,
 616                            IB_MGMT_RMPP_STATUS_BAD_STATUS);
 617                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 618                 return;
 619         }
 620
 621         seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
 622         newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
 623         if (newwin < seg_num) {
 624                 abort_send(agent, rmpp_mad->mad_hdr.tid,
 625                            IB_MGMT_RMPP_STATUS_W2S);
 626                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
 627                 return;
 628         }
 629
 630         spin_lock_irqsave(&agent->lock, flags);
 631         mad_send_wr = ib_find_send_mad(agent, rmpp_mad->mad_hdr.tid);
 632         if (!mad_send_wr)
 633                 goto out;       /* Unmatched ACK */
 634
 635         if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
 636             (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
 637                 goto out;       /* Send is already done */
 638
 639         if (seg_num > mad_send_wr->send_buf.seg_count ||
 640             seg_num > mad_send_wr->newwin) {
 641                 spin_unlock_irqrestore(&agent->lock, flags);
 642                 abort_send(agent, rmpp_mad->mad_hdr.tid,
 643                            IB_MGMT_RMPP_STATUS_S2B);
 644                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
 645                 return;
 646         }
 647
 648         if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
 649                 goto out;       /* Old ACK */
 650
 651         if (seg_num > mad_send_wr->last_ack) {
 652                 adjust_last_ack(mad_send_wr, seg_num);
 653                 mad_send_wr->retries = mad_send_wr->send_buf.retries;
 654         }
 655         mad_send_wr->newwin = newwin;
 656         if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
 657                 /* If no response is expected, the ACK completes the send */
 658                 if (!mad_send_wr->send_buf.timeout_ms) {
 659                         struct ib_mad_send_wc wc;
 660
 661                         ib_mark_mad_done(mad_send_wr);
 662                         spin_unlock_irqrestore(&agent->lock, flags);
 663
 664                         wc.status = IB_WC_SUCCESS;
 665                         wc.vendor_err = 0;
 666                         wc.send_buf = &mad_send_wr->send_buf;
 667                         ib_mad_complete_send_wr(mad_send_wr, &wc);
 668                         return;
 669                 }
 670                 if (mad_send_wr->refcount == 1)
 671                         ib_reset_mad_timeout(mad_send_wr,
 672                                              mad_send_wr->send_buf.timeout_ms);
 673         } else if (mad_send_wr->refcount == 1 &&
 674                    mad_send_wr->seg_num < mad_send_wr->newwin &&
 675                    mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) {
 676                 /* Send failure will just result in a timeout/retry */
 677                 ret = send_next_seg(mad_send_wr);
 678                 if (ret)
 679                         goto out;
 680
 681                 mad_send_wr->refcount++;
 682                 list_del(&mad_send_wr->agent_list);
 683                 list_add_tail(&mad_send_wr->agent_list,
 684                               &mad_send_wr->mad_agent_priv->send_list);
 685         }
 686 out:
 687         spin_unlock_irqrestore(&agent->lock, flags);
 688 }
 689
 690 static struct ib_mad_recv_wc *
 691 process_rmpp_data(struct ib_mad_agent_private *agent,
 692                   struct ib_mad_recv_wc *mad_recv_wc)
 693 {
 694         struct ib_rmpp_hdr *rmpp_hdr;
 695         u8 rmpp_status;
 696
 697         rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;
 698
 699         if (rmpp_hdr->rmpp_status) {
 700                 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
 701                 goto bad;
 702         }
 703
 704         if (rmpp_hdr->seg_num == __constant_htonl(1)) {
 705                 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) {
 706                         rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
 707                         goto bad;
 708                 }
 709                 return start_rmpp(agent, mad_recv_wc);
 710         } else {
 711                 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
 712                         rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
 713                         goto bad;
 714                 }
 715                 return continue_rmpp(agent, mad_recv_wc);
 716         }
 717 bad:
 718         nack_recv(agent, mad_recv_wc, rmpp_status);
 719         ib_free_recv_mad(mad_recv_wc);
 720         return NULL;
 721 }
 722
 723 static void process_rmpp_stop(struct ib_mad_agent_private *agent,
 724                               struct ib_mad_recv_wc *mad_recv_wc)
 725 {
 726         struct ib_rmpp_mad *rmpp_mad;
 727
 728         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 729
 730         if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
 731                 abort_send(agent, rmpp_mad->mad_hdr.tid,
 732                            IB_MGMT_RMPP_STATUS_BAD_STATUS);
 733                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 734         } else
 735                 abort_send(agent, rmpp_mad->mad_hdr.tid,
 736                            rmpp_mad->rmpp_hdr.rmpp_status);
 737 }
 738
 739 static void process_rmpp_abort(struct ib_mad_agent_private *agent,
 740                                struct ib_mad_recv_wc *mad_recv_wc)
 741 {
 742         struct ib_rmpp_mad *rmpp_mad;
 743
 744         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 745
 746         if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
 747             rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
 748                 abort_send(agent, rmpp_mad->mad_hdr.tid,
 749                            IB_MGMT_RMPP_STATUS_BAD_STATUS);
 750                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 751         } else
 752                 abort_send(agent, rmpp_mad->mad_hdr.tid,
 753                            rmpp_mad->rmpp_hdr.rmpp_status);
 754 }
 755
 756 struct ib_mad_recv_wc *
 757 ib_process_rmpp_recv_wc(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         if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
 764                 return mad_recv_wc;
 765
 766         if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
 767                 abort_send(agent, rmpp_mad->mad_hdr.tid,
 768                            IB_MGMT_RMPP_STATUS_UNV);
 769                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
 770                 goto out;
 771         }
 772
 773         switch (rmpp_mad->rmpp_hdr.rmpp_type) {
 774         case IB_MGMT_RMPP_TYPE_DATA:
 775                 return process_rmpp_data(agent, mad_recv_wc);
 776         case IB_MGMT_RMPP_TYPE_ACK:
 777                 process_rmpp_ack(agent, mad_recv_wc);
 778                 break;
 779         case IB_MGMT_RMPP_TYPE_STOP:
 780                 process_rmpp_stop(agent, mad_recv_wc);
 781                 break;
 782         case IB_MGMT_RMPP_TYPE_ABORT:
 783                 process_rmpp_abort(agent, mad_recv_wc);
 784                 break;
 785         default:
 786                 abort_send(agent, rmpp_mad->mad_hdr.tid,
 787                            IB_MGMT_RMPP_STATUS_BADT);
 788                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
 789                 break;
 790         }
 791 out:
 792         ib_free_recv_mad(mad_recv_wc);
 793         return NULL;
 794 }
 795
 796 int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
 797 {
 798         struct ib_rmpp_mad *rmpp_mad;
 799         int ret;
 800
 801         rmpp_mad = mad_send_wr->send_buf.mad;
 802         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 803               IB_MGMT_RMPP_FLAG_ACTIVE))
 804                 return IB_RMPP_RESULT_UNHANDLED;
 805
 806         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) {
 807                 mad_send_wr->seg_num = 1;
 808                 return IB_RMPP_RESULT_INTERNAL;
 809         }
 810
 811         mad_send_wr->newwin = 1;
 812
 813         /* We need to wait for the final ACK even if there isn't a response */
 814         mad_send_wr->refcount += (mad_send_wr->timeout == 0);
 815         ret = send_next_seg(mad_send_wr);
 816         if (!ret)
 817                 return IB_RMPP_RESULT_CONSUMED;
 818         return ret;
 819 }
 820
 821 int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
 822                             struct ib_mad_send_wc *mad_send_wc)
 823 {
 824         struct ib_rmpp_mad *rmpp_mad;
 825         int ret;
 826
 827         rmpp_mad = mad_send_wr->send_buf.mad;
 828         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 829               IB_MGMT_RMPP_FLAG_ACTIVE))
 830                 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
 831
 832         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
 833                 return IB_RMPP_RESULT_INTERNAL;  /* ACK, STOP, or ABORT */
 834
 835         if (mad_send_wc->status != IB_WC_SUCCESS ||
 836             mad_send_wr->status != IB_WC_SUCCESS)
 837                 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
 838
 839         if (!mad_send_wr->timeout)
 840                 return IB_RMPP_RESULT_PROCESSED; /* Response received */
 841
 842         if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
 843                 mad_send_wr->timeout =
 844                         msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
 845                 return IB_RMPP_RESULT_PROCESSED; /* Send done */
 846         }
 847
 848         if (mad_send_wr->seg_num == mad_send_wr->newwin ||
 849             mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count)
 850                 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
 851
 852         ret = send_next_seg(mad_send_wr);
 853         if (ret) {
 854                 mad_send_wc->status = IB_WC_GENERAL_ERR;
 855                 return IB_RMPP_RESULT_PROCESSED;
 856         }
 857         return IB_RMPP_RESULT_CONSUMED;
 858 }
 859
 860 int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
 861 {
 862         struct ib_rmpp_mad *rmpp_mad;
 863         int ret;
 864
 865         rmpp_mad = mad_send_wr->send_buf.mad;
 866         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 867               IB_MGMT_RMPP_FLAG_ACTIVE))
 868                 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
 869
 870         if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count)
 871                 return IB_RMPP_RESULT_PROCESSED;
 872
 873         mad_send_wr->seg_num = mad_send_wr->last_ack;
 874         mad_send_wr->cur_seg = mad_send_wr->last_ack_seg;
 875
 876         ret = send_next_seg(mad_send_wr);
 877         if (ret)
 878                 return IB_RMPP_RESULT_PROCESSED;
 879
 880         return IB_RMPP_RESULT_CONSUMED;
 881 }