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