kernel/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         RMPP_STATE_CANCELING
  45 };
  46
  47 struct mad_rmpp_recv {
  48         struct ib_mad_agent_private *agent;
  49         struct list_head list;
  50         struct delayed_work timeout_work;
  51         struct delayed_work cleanup_work;
  52         struct completion comp;
  53         enum rmpp_state state;
  54         spinlock_t lock;
  55         atomic_t refcount;
  56
  57         struct ib_ah *ah;
  58         struct ib_mad_recv_wc *rmpp_wc;
  59         struct ib_mad_recv_buf *cur_seg_buf;
  60         int last_ack;
  61         int seg_num;
  62         int newwin;
  63         int repwin;
  64
  65         __be64 tid;
  66         u32 src_qp;
  67         u16 slid;
  68         u8 mgmt_class;
  69         u8 class_version;
  70         u8 method;
  71         u8 base_version;
  72 };
  73
  74 static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
  75 {
  76         if (atomic_dec_and_test(&rmpp_recv->refcount))
  77                 complete(&rmpp_recv->comp);
  78 }
  79
  80 static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
  81 {
  82         deref_rmpp_recv(rmpp_recv);
  83         wait_for_completion(&rmpp_recv->comp);
  84         ib_destroy_ah(rmpp_recv->ah);
  85         kfree(rmpp_recv);
  86 }
  87
  88 void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent)
  89 {
  90         struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv;
  91         unsigned long flags;
  92
  93         spin_lock_irqsave(&agent->lock, flags);
  94         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
  95                 if (rmpp_recv->state != RMPP_STATE_COMPLETE)
  96                         ib_free_recv_mad(rmpp_recv->rmpp_wc);
  97                 rmpp_recv->state = RMPP_STATE_CANCELING;
  98         }
  99         spin_unlock_irqrestore(&agent->lock, flags);
 100
 101         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
 102                 cancel_delayed_work(&rmpp_recv->timeout_work);
 103                 cancel_delayed_work(&rmpp_recv->cleanup_work);
 104         }
 105
 106         flush_workqueue(agent->qp_info->port_priv->wq);
 107
 108         list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv,
 109                                  &agent->rmpp_list, list) {
 110                 list_del(&rmpp_recv->list);
 111                 destroy_rmpp_recv(rmpp_recv);
 112         }
 113 }
 114
 115 static void format_ack(struct ib_mad_send_buf *msg,
 116                        struct ib_rmpp_mad *data,
 117                        struct mad_rmpp_recv *rmpp_recv)
 118 {
 119         struct ib_rmpp_mad *ack = msg->mad;
 120         unsigned long flags;
 121
 122         memcpy(ack, &data->mad_hdr, msg->hdr_len);
 123
 124         ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
 125         ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK;
 126         ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 127
 128         spin_lock_irqsave(&rmpp_recv->lock, flags);
 129         rmpp_recv->last_ack = rmpp_recv->seg_num;
 130         ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num);
 131         ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin);
 132         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 133 }
 134
 135 static void ack_recv(struct mad_rmpp_recv *rmpp_recv,
 136                      struct ib_mad_recv_wc *recv_wc)
 137 {
 138         struct ib_mad_send_buf *msg;
 139         int ret, hdr_len;
 140
 141         hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
 142         msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp,
 143                                  recv_wc->wc->pkey_index, 1, hdr_len,
 144                                  0, GFP_KERNEL,
 145                                  IB_MGMT_BASE_VERSION);
 146         if (IS_ERR(msg))
 147                 return;
 148
 149         format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv);
 150         msg->ah = rmpp_recv->ah;
 151         ret = ib_post_send_mad(msg, NULL);
 152         if (ret)
 153                 ib_free_send_mad(msg);
 154 }
 155
 156 static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent,
 157                                                   struct ib_mad_recv_wc *recv_wc)
 158 {
 159         struct ib_mad_send_buf *msg;
 160         struct ib_ah *ah;
 161         int hdr_len;
 162
 163         ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc,
 164                                   recv_wc->recv_buf.grh, agent->port_num);
 165         if (IS_ERR(ah))
 166                 return (void *) ah;
 167
 168         hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
 169         msg = ib_create_send_mad(agent, recv_wc->wc->src_qp,
 170                                  recv_wc->wc->pkey_index, 1,
 171                                  hdr_len, 0, GFP_KERNEL,
 172                                  IB_MGMT_BASE_VERSION);
 173         if (IS_ERR(msg))
 174                 ib_destroy_ah(ah);
 175         else {
 176                 msg->ah = ah;
 177                 msg->context[0] = ah;
 178         }
 179
 180         return msg;
 181 }
 182
 183 static void ack_ds_ack(struct ib_mad_agent_private *agent,
 184                        struct ib_mad_recv_wc *recv_wc)
 185 {
 186         struct ib_mad_send_buf *msg;
 187         struct ib_rmpp_mad *rmpp_mad;
 188         int ret;
 189
 190         msg = alloc_response_msg(&agent->agent, recv_wc);
 191         if (IS_ERR(msg))
 192                 return;
 193
 194         rmpp_mad = msg->mad;
 195         memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
 196
 197         rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
 198         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 199         rmpp_mad->rmpp_hdr.seg_num = 0;
 200         rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(1);
 201
 202         ret = ib_post_send_mad(msg, NULL);
 203         if (ret) {
 204                 ib_destroy_ah(msg->ah);
 205                 ib_free_send_mad(msg);
 206         }
 207 }
 208
 209 void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc)
 210 {
 211         if (mad_send_wc->send_buf->context[0] == mad_send_wc->send_buf->ah)
 212                 ib_destroy_ah(mad_send_wc->send_buf->ah);
 213         ib_free_send_mad(mad_send_wc->send_buf);
 214 }
 215
 216 static void nack_recv(struct ib_mad_agent_private *agent,
 217                       struct ib_mad_recv_wc *recv_wc, u8 rmpp_status)
 218 {
 219         struct ib_mad_send_buf *msg;
 220         struct ib_rmpp_mad *rmpp_mad;
 221         int ret;
 222
 223         msg = alloc_response_msg(&agent->agent, recv_wc);
 224         if (IS_ERR(msg))
 225                 return;
 226
 227         rmpp_mad = msg->mad;
 228         memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
 229
 230         rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
 231         rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION;
 232         rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT;
 233         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 234         rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status;
 235         rmpp_mad->rmpp_hdr.seg_num = 0;
 236         rmpp_mad->rmpp_hdr.paylen_newwin = 0;
 237
 238         ret = ib_post_send_mad(msg, NULL);
 239         if (ret) {
 240                 ib_destroy_ah(msg->ah);
 241                 ib_free_send_mad(msg);
 242         }
 243 }
 244
 245 static void recv_timeout_handler(struct work_struct *work)
 246 {
 247         struct mad_rmpp_recv *rmpp_recv =
 248                 container_of(work, struct mad_rmpp_recv, timeout_work.work);
 249         struct ib_mad_recv_wc *rmpp_wc;
 250         unsigned long flags;
 251
 252         spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
 253         if (rmpp_recv->state != RMPP_STATE_ACTIVE) {
 254                 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 255                 return;
 256         }
 257         rmpp_recv->state = RMPP_STATE_TIMEOUT;
 258         list_del(&rmpp_recv->list);
 259         spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 260
 261         rmpp_wc = rmpp_recv->rmpp_wc;
 262         nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L);
 263         destroy_rmpp_recv(rmpp_recv);
 264         ib_free_recv_mad(rmpp_wc);
 265 }
 266
 267 static void recv_cleanup_handler(struct work_struct *work)
 268 {
 269         struct mad_rmpp_recv *rmpp_recv =
 270                 container_of(work, struct mad_rmpp_recv, cleanup_work.work);
 271         unsigned long flags;
 272
 273         spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
 274         if (rmpp_recv->state == RMPP_STATE_CANCELING) {
 275                 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 276                 return;
 277         }
 278         list_del(&rmpp_recv->list);
 279         spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 280         destroy_rmpp_recv(rmpp_recv);
 281 }
 282
 283 static struct mad_rmpp_recv *
 284 create_rmpp_recv(struct ib_mad_agent_private *agent,
 285                  struct ib_mad_recv_wc *mad_recv_wc)
 286 {
 287         struct mad_rmpp_recv *rmpp_recv;
 288         struct ib_mad_hdr *mad_hdr;
 289
 290         rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
 291         if (!rmpp_recv)
 292                 return NULL;
 293
 294         rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
 295                                              mad_recv_wc->wc,
 296                                              mad_recv_wc->recv_buf.grh,
 297                                              agent->agent.port_num);
 298         if (IS_ERR(rmpp_recv->ah))
 299                 goto error;
 300
 301         rmpp_recv->agent = agent;
 302         init_completion(&rmpp_recv->comp);
 303         INIT_DELAYED_WORK(&rmpp_recv->timeout_work, recv_timeout_handler);
 304         INIT_DELAYED_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler);
 305         spin_lock_init(&rmpp_recv->lock);
 306         rmpp_recv->state = RMPP_STATE_ACTIVE;
 307         atomic_set(&rmpp_recv->refcount, 1);
 308
 309         rmpp_recv->rmpp_wc = mad_recv_wc;
 310         rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
 311         rmpp_recv->newwin = 1;
 312         rmpp_recv->seg_num = 1;
 313         rmpp_recv->last_ack = 0;
 314         rmpp_recv->repwin = 1;
 315
 316         mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
 317         rmpp_recv->tid = mad_hdr->tid;
 318         rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
 319         rmpp_recv->slid = mad_recv_wc->wc->slid;
 320         rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
 321         rmpp_recv->class_version = mad_hdr->class_version;
 322         rmpp_recv->method  = mad_hdr->method;
 323         rmpp_recv->base_version  = mad_hdr->base_version;
 324         return rmpp_recv;
 325
 326 error:  kfree(rmpp_recv);
 327         return NULL;
 328 }
 329
 330 static struct mad_rmpp_recv *
 331 find_rmpp_recv(struct ib_mad_agent_private *agent,
 332                struct ib_mad_recv_wc *mad_recv_wc)
 333 {
 334         struct mad_rmpp_recv *rmpp_recv;
 335         struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
 336
 337         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
 338                 if (rmpp_recv->tid == mad_hdr->tid &&
 339                     rmpp_recv->src_qp == mad_recv_wc->wc->src_qp &&
 340                     rmpp_recv->slid == mad_recv_wc->wc->slid &&
 341                     rmpp_recv->mgmt_class == mad_hdr->mgmt_class &&
 342                     rmpp_recv->class_version == mad_hdr->class_version &&
 343                     rmpp_recv->method == mad_hdr->method)
 344                         return rmpp_recv;
 345         }
 346         return NULL;
 347 }
 348
 349 static struct mad_rmpp_recv *
 350 acquire_rmpp_recv(struct ib_mad_agent_private *agent,
 351                   struct ib_mad_recv_wc *mad_recv_wc)
 352 {
 353         struct mad_rmpp_recv *rmpp_recv;
 354         unsigned long flags;
 355
 356         spin_lock_irqsave(&agent->lock, flags);
 357         rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
 358         if (rmpp_recv)
 359                 atomic_inc(&rmpp_recv->refcount);
 360         spin_unlock_irqrestore(&agent->lock, flags);
 361         return rmpp_recv;
 362 }
 363
 364 static struct mad_rmpp_recv *
 365 insert_rmpp_recv(struct ib_mad_agent_private *agent,
 366                  struct mad_rmpp_recv *rmpp_recv)
 367 {
 368         struct mad_rmpp_recv *cur_rmpp_recv;
 369
 370         cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
 371         if (!cur_rmpp_recv)
 372                 list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
 373
 374         return cur_rmpp_recv;
 375 }
 376
 377 static inline int get_last_flag(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 ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
 383 }
 384
 385 static inline int get_seg_num(struct ib_mad_recv_buf *seg)
 386 {
 387         struct ib_rmpp_mad *rmpp_mad;
 388
 389         rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
 390         return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
 391 }
 392
 393 static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list,
 394                                                     struct ib_mad_recv_buf *seg)
 395 {
 396         if (seg->list.next == rmpp_list)
 397                 return NULL;
 398
 399         return container_of(seg->list.next, struct ib_mad_recv_buf, list);
 400 }
 401
 402 static inline int window_size(struct ib_mad_agent_private *agent)
 403 {
 404         return max(agent->qp_info->recv_queue.max_active >> 3, 1);
 405 }
 406
 407 static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list,
 408                                                   int seg_num)
 409 {
 410         struct ib_mad_recv_buf *seg_buf;
 411         int cur_seg_num;
 412
 413         list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
 414                 cur_seg_num = get_seg_num(seg_buf);
 415                 if (seg_num > cur_seg_num)
 416                         return seg_buf;
 417                 if (seg_num == cur_seg_num)
 418                         break;
 419         }
 420         return NULL;
 421 }
 422
 423 static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
 424                            struct ib_mad_recv_buf *new_buf)
 425 {
 426         struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
 427
 428         while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
 429                 rmpp_recv->cur_seg_buf = new_buf;
 430                 rmpp_recv->seg_num++;
 431                 new_buf = get_next_seg(rmpp_list, new_buf);
 432         }
 433 }
 434
 435 static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
 436 {
 437         struct ib_rmpp_mad *rmpp_mad;
 438         int hdr_size, data_size, pad;
 439         bool opa = rdma_cap_opa_mad(rmpp_recv->agent->qp_info->port_priv->device,
 440                                     rmpp_recv->agent->qp_info->port_priv->port_num);
 441
 442         rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
 443
 444         hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
 445         if (opa && rmpp_recv->base_version == OPA_MGMT_BASE_VERSION) {
 446                 data_size = sizeof(struct opa_rmpp_mad) - hdr_size;
 447                 pad = OPA_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
 448                 if (pad > OPA_MGMT_RMPP_DATA || pad < 0)
 449                         pad = 0;
 450         } else {
 451                 data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
 452                 pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
 453                 if (pad > IB_MGMT_RMPP_DATA || pad < 0)
 454                         pad = 0;
 455         }
 456
 457         return hdr_size + rmpp_recv->seg_num * data_size - pad;
 458 }
 459
 460 static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
 461 {
 462         struct ib_mad_recv_wc *rmpp_wc;
 463
 464         ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
 465         if (rmpp_recv->seg_num > 1)
 466                 cancel_delayed_work(&rmpp_recv->timeout_work);
 467
 468         rmpp_wc = rmpp_recv->rmpp_wc;
 469         rmpp_wc->mad_len = get_mad_len(rmpp_recv);
 470         /* 10 seconds until we can find the packet lifetime */
 471         queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
 472                            &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
 473         return rmpp_wc;
 474 }
 475
 476 static struct ib_mad_recv_wc *
 477 continue_rmpp(struct ib_mad_agent_private *agent,
 478               struct ib_mad_recv_wc *mad_recv_wc)
 479 {
 480         struct mad_rmpp_recv *rmpp_recv;
 481         struct ib_mad_recv_buf *prev_buf;
 482         struct ib_mad_recv_wc *done_wc;
 483         int seg_num;
 484         unsigned long flags;
 485
 486         rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
 487         if (!rmpp_recv)
 488                 goto drop1;
 489
 490         seg_num = get_seg_num(&mad_recv_wc->recv_buf);
 491
 492         spin_lock_irqsave(&rmpp_recv->lock, flags);
 493         if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
 494             (seg_num > rmpp_recv->newwin))
 495                 goto drop3;
 496
 497         if ((seg_num <= rmpp_recv->last_ack) ||
 498             (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
 499                 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 500                 ack_recv(rmpp_recv, mad_recv_wc);
 501                 goto drop2;
 502         }
 503
 504         prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
 505         if (!prev_buf)
 506                 goto drop3;
 507
 508         done_wc = NULL;
 509         list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
 510         if (rmpp_recv->cur_seg_buf == prev_buf) {
 511                 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
 512                 if (get_last_flag(rmpp_recv->cur_seg_buf)) {
 513                         rmpp_recv->state = RMPP_STATE_COMPLETE;
 514                         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 515                         done_wc = complete_rmpp(rmpp_recv);
 516                         goto out;
 517                 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
 518                         rmpp_recv->newwin += window_size(agent);
 519                         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 520                         ack_recv(rmpp_recv, mad_recv_wc);
 521                         goto out;
 522                 }
 523         }
 524         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 525 out:
 526         deref_rmpp_recv(rmpp_recv);
 527         return done_wc;
 528
 529 drop3:  spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 530 drop2:  deref_rmpp_recv(rmpp_recv);
 531 drop1:  ib_free_recv_mad(mad_recv_wc);
 532         return NULL;
 533 }
 534
 535 static struct ib_mad_recv_wc *
 536 start_rmpp(struct ib_mad_agent_private *agent,
 537            struct ib_mad_recv_wc *mad_recv_wc)
 538 {
 539         struct mad_rmpp_recv *rmpp_recv;
 540         unsigned long flags;
 541
 542         rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
 543         if (!rmpp_recv) {
 544                 ib_free_recv_mad(mad_recv_wc);
 545                 return NULL;
 546         }
 547
 548         spin_lock_irqsave(&agent->lock, flags);
 549         if (insert_rmpp_recv(agent, rmpp_recv)) {
 550                 spin_unlock_irqrestore(&agent->lock, flags);
 551                 /* duplicate first MAD */
 552                 destroy_rmpp_recv(rmpp_recv);
 553                 return continue_rmpp(agent, mad_recv_wc);
 554         }
 555         atomic_inc(&rmpp_recv->refcount);
 556
 557         if (get_last_flag(&mad_recv_wc->recv_buf)) {
 558                 rmpp_recv->state = RMPP_STATE_COMPLETE;
 559                 spin_unlock_irqrestore(&agent->lock, flags);
 560                 complete_rmpp(rmpp_recv);
 561         } else {
 562                 spin_unlock_irqrestore(&agent->lock, flags);
 563                 /* 40 seconds until we can find the packet lifetimes */
 564                 queue_delayed_work(agent->qp_info->port_priv->wq,
 565                                    &rmpp_recv->timeout_work,
 566                                    msecs_to_jiffies(40000));
 567                 rmpp_recv->newwin += window_size(agent);
 568                 ack_recv(rmpp_recv, mad_recv_wc);
 569                 mad_recv_wc = NULL;
 570         }
 571         deref_rmpp_recv(rmpp_recv);
 572         return mad_recv_wc;
 573 }
 574
 575 static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
 576 {
 577         struct ib_rmpp_mad *rmpp_mad;
 578         int timeout;
 579         u32 paylen = 0;
 580
 581         rmpp_mad = mad_send_wr->send_buf.mad;
 582         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 583         rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num);
 584
 585         if (mad_send_wr->seg_num == 1) {
 586                 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
 587                 paylen = (mad_send_wr->send_buf.seg_count *
 588                           mad_send_wr->send_buf.seg_rmpp_size) -
 589                           mad_send_wr->pad;
 590         }
 591
 592         if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) {
 593                 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
 594                 paylen = mad_send_wr->send_buf.seg_rmpp_size - mad_send_wr->pad;
 595         }
 596         rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
 597
 598         /* 2 seconds for an ACK until we can find the packet lifetime */
 599         timeout = mad_send_wr->send_buf.timeout_ms;
 600         if (!timeout || timeout > 2000)
 601                 mad_send_wr->timeout = msecs_to_jiffies(2000);
 602
 603         return ib_send_mad(mad_send_wr);
 604 }
 605
 606 static void abort_send(struct ib_mad_agent_private *agent,
 607                        struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status)
 608 {
 609         struct ib_mad_send_wr_private *mad_send_wr;
 610         struct ib_mad_send_wc wc;
 611         unsigned long flags;
 612
 613         spin_lock_irqsave(&agent->lock, flags);
 614         mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
 615         if (!mad_send_wr)
 616                 goto out;       /* Unmatched send */
 617
 618         if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
 619             (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
 620                 goto out;       /* Send is already done */
 621
 622         ib_mark_mad_done(mad_send_wr);
 623         spin_unlock_irqrestore(&agent->lock, flags);
 624
 625         wc.status = IB_WC_REM_ABORT_ERR;
 626         wc.vendor_err = rmpp_status;
 627         wc.send_buf = &mad_send_wr->send_buf;
 628         ib_mad_complete_send_wr(mad_send_wr, &wc);
 629         return;
 630 out:
 631         spin_unlock_irqrestore(&agent->lock, flags);
 632 }
 633
 634 static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr,
 635                                    int seg_num)
 636 {
 637         struct list_head *list;
 638
 639         wr->last_ack = seg_num;
 640         list = &wr->last_ack_seg->list;
 641         list_for_each_entry(wr->last_ack_seg, list, list)
 642                 if (wr->last_ack_seg->num == seg_num)
 643                         break;
 644 }
 645
 646 static void process_ds_ack(struct ib_mad_agent_private *agent,
 647                            struct ib_mad_recv_wc *mad_recv_wc, int newwin)
 648 {
 649         struct mad_rmpp_recv *rmpp_recv;
 650
 651         rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
 652         if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE)
 653                 rmpp_recv->repwin = newwin;
 654 }
 655
 656 static void process_rmpp_ack(struct ib_mad_agent_private *agent,
 657                              struct ib_mad_recv_wc *mad_recv_wc)
 658 {
 659         struct ib_mad_send_wr_private *mad_send_wr;
 660         struct ib_rmpp_mad *rmpp_mad;
 661         unsigned long flags;
 662         int seg_num, newwin, ret;
 663
 664         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 665         if (rmpp_mad->rmpp_hdr.rmpp_status) {
 666                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 667                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 668                 return;
 669         }
 670
 671         seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
 672         newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
 673         if (newwin < seg_num) {
 674                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
 675                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
 676                 return;
 677         }
 678
 679         spin_lock_irqsave(&agent->lock, flags);
 680         mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
 681         if (!mad_send_wr) {
 682                 if (!seg_num)
 683                         process_ds_ack(agent, mad_recv_wc, newwin);
 684                 goto out;       /* Unmatched or DS RMPP ACK */
 685         }
 686
 687         if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) &&
 688             (mad_send_wr->timeout)) {
 689                 spin_unlock_irqrestore(&agent->lock, flags);
 690                 ack_ds_ack(agent, mad_recv_wc);
 691                 return;         /* Repeated ACK for DS RMPP transaction */
 692         }
 693
 694         if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
 695             (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
 696                 goto out;       /* Send is already done */
 697
 698         if (seg_num > mad_send_wr->send_buf.seg_count ||
 699             seg_num > mad_send_wr->newwin) {
 700                 spin_unlock_irqrestore(&agent->lock, flags);
 701                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
 702                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
 703                 return;
 704         }
 705
 706         if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
 707                 goto out;       /* Old ACK */
 708
 709         if (seg_num > mad_send_wr->last_ack) {
 710                 adjust_last_ack(mad_send_wr, seg_num);
 711                 mad_send_wr->retries_left = mad_send_wr->max_retries;
 712         }
 713         mad_send_wr->newwin = newwin;
 714         if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
 715                 /* If no response is expected, the ACK completes the send */
 716                 if (!mad_send_wr->send_buf.timeout_ms) {
 717                         struct ib_mad_send_wc wc;
 718
 719                         ib_mark_mad_done(mad_send_wr);
 720                         spin_unlock_irqrestore(&agent->lock, flags);
 721
 722                         wc.status = IB_WC_SUCCESS;
 723                         wc.vendor_err = 0;
 724                         wc.send_buf = &mad_send_wr->send_buf;
 725                         ib_mad_complete_send_wr(mad_send_wr, &wc);
 726                         return;
 727                 }
 728                 if (mad_send_wr->refcount == 1)
 729                         ib_reset_mad_timeout(mad_send_wr,
 730                                              mad_send_wr->send_buf.timeout_ms);
 731                 spin_unlock_irqrestore(&agent->lock, flags);
 732                 ack_ds_ack(agent, mad_recv_wc);
 733                 return;
 734         } else if (mad_send_wr->refcount == 1 &&
 735                    mad_send_wr->seg_num < mad_send_wr->newwin &&
 736                    mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) {
 737                 /* Send failure will just result in a timeout/retry */
 738                 ret = send_next_seg(mad_send_wr);
 739                 if (ret)
 740                         goto out;
 741
 742                 mad_send_wr->refcount++;
 743                 list_move_tail(&mad_send_wr->agent_list,
 744                               &mad_send_wr->mad_agent_priv->send_list);
 745         }
 746 out:
 747         spin_unlock_irqrestore(&agent->lock, flags);
 748 }
 749
 750 static struct ib_mad_recv_wc *
 751 process_rmpp_data(struct ib_mad_agent_private *agent,
 752                   struct ib_mad_recv_wc *mad_recv_wc)
 753 {
 754         struct ib_rmpp_hdr *rmpp_hdr;
 755         u8 rmpp_status;
 756
 757         rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;
 758
 759         if (rmpp_hdr->rmpp_status) {
 760                 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
 761                 goto bad;
 762         }
 763
 764         if (rmpp_hdr->seg_num == cpu_to_be32(1)) {
 765                 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) {
 766                         rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
 767                         goto bad;
 768                 }
 769                 return start_rmpp(agent, mad_recv_wc);
 770         } else {
 771                 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
 772                         rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
 773                         goto bad;
 774                 }
 775                 return continue_rmpp(agent, mad_recv_wc);
 776         }
 777 bad:
 778         nack_recv(agent, mad_recv_wc, rmpp_status);
 779         ib_free_recv_mad(mad_recv_wc);
 780         return NULL;
 781 }
 782
 783 static void process_rmpp_stop(struct ib_mad_agent_private *agent,
 784                               struct ib_mad_recv_wc *mad_recv_wc)
 785 {
 786         struct ib_rmpp_mad *rmpp_mad;
 787
 788         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 789
 790         if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
 791                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 792                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 793         } else
 794                 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
 795 }
 796
 797 static void process_rmpp_abort(struct ib_mad_agent_private *agent,
 798                                struct ib_mad_recv_wc *mad_recv_wc)
 799 {
 800         struct ib_rmpp_mad *rmpp_mad;
 801
 802         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 803
 804         if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
 805             rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
 806                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 807                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 808         } else
 809                 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
 810 }
 811
 812 struct ib_mad_recv_wc *
 813 ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
 814                         struct ib_mad_recv_wc *mad_recv_wc)
 815 {
 816         struct ib_rmpp_mad *rmpp_mad;
 817
 818         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 819         if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
 820                 return mad_recv_wc;
 821
 822         if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
 823                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
 824                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
 825                 goto out;
 826         }
 827
 828         switch (rmpp_mad->rmpp_hdr.rmpp_type) {
 829         case IB_MGMT_RMPP_TYPE_DATA:
 830                 return process_rmpp_data(agent, mad_recv_wc);
 831         case IB_MGMT_RMPP_TYPE_ACK:
 832                 process_rmpp_ack(agent, mad_recv_wc);
 833                 break;
 834         case IB_MGMT_RMPP_TYPE_STOP:
 835                 process_rmpp_stop(agent, mad_recv_wc);
 836                 break;
 837         case IB_MGMT_RMPP_TYPE_ABORT:
 838                 process_rmpp_abort(agent, mad_recv_wc);
 839                 break;
 840         default:
 841                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
 842                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
 843                 break;
 844         }
 845 out:
 846         ib_free_recv_mad(mad_recv_wc);
 847         return NULL;
 848 }
 849
 850 static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr)
 851 {
 852         struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv;
 853         struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad;
 854         struct mad_rmpp_recv *rmpp_recv;
 855         struct ib_ah_attr ah_attr;
 856         unsigned long flags;
 857         int newwin = 1;
 858
 859         if (!(mad_hdr->method & IB_MGMT_METHOD_RESP))
 860                 goto out;
 861
 862         spin_lock_irqsave(&agent->lock, flags);
 863         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
 864                 if (rmpp_recv->tid != mad_hdr->tid ||
 865                     rmpp_recv->mgmt_class != mad_hdr->mgmt_class ||
 866                     rmpp_recv->class_version != mad_hdr->class_version ||
 867                     (rmpp_recv->method & IB_MGMT_METHOD_RESP))
 868                         continue;
 869
 870                 if (ib_query_ah(mad_send_wr->send_buf.ah, &ah_attr))
 871                         continue;
 872
 873                 if (rmpp_recv->slid == ah_attr.dlid) {
 874                         newwin = rmpp_recv->repwin;
 875                         break;
 876                 }
 877         }
 878         spin_unlock_irqrestore(&agent->lock, flags);
 879 out:
 880         return newwin;
 881 }
 882
 883 int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
 884 {
 885         struct ib_rmpp_mad *rmpp_mad;
 886         int ret;
 887
 888         rmpp_mad = mad_send_wr->send_buf.mad;
 889         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 890               IB_MGMT_RMPP_FLAG_ACTIVE))
 891                 return IB_RMPP_RESULT_UNHANDLED;
 892
 893         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) {
 894                 mad_send_wr->seg_num = 1;
 895                 return IB_RMPP_RESULT_INTERNAL;
 896         }
 897
 898         mad_send_wr->newwin = init_newwin(mad_send_wr);
 899
 900         /* We need to wait for the final ACK even if there isn't a response */
 901         mad_send_wr->refcount += (mad_send_wr->timeout == 0);
 902         ret = send_next_seg(mad_send_wr);
 903         if (!ret)
 904                 return IB_RMPP_RESULT_CONSUMED;
 905         return ret;
 906 }
 907
 908 int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
 909                             struct ib_mad_send_wc *mad_send_wc)
 910 {
 911         struct ib_rmpp_mad *rmpp_mad;
 912         int ret;
 913
 914         rmpp_mad = mad_send_wr->send_buf.mad;
 915         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 916               IB_MGMT_RMPP_FLAG_ACTIVE))
 917                 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
 918
 919         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
 920                 return IB_RMPP_RESULT_INTERNAL;  /* ACK, STOP, or ABORT */
 921
 922         if (mad_send_wc->status != IB_WC_SUCCESS ||
 923             mad_send_wr->status != IB_WC_SUCCESS)
 924                 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
 925
 926         if (!mad_send_wr->timeout)
 927                 return IB_RMPP_RESULT_PROCESSED; /* Response received */
 928
 929         if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
 930                 mad_send_wr->timeout =
 931                         msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
 932                 return IB_RMPP_RESULT_PROCESSED; /* Send done */
 933         }
 934
 935         if (mad_send_wr->seg_num == mad_send_wr->newwin ||
 936             mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count)
 937                 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
 938
 939         ret = send_next_seg(mad_send_wr);
 940         if (ret) {
 941                 mad_send_wc->status = IB_WC_GENERAL_ERR;
 942                 return IB_RMPP_RESULT_PROCESSED;
 943         }
 944         return IB_RMPP_RESULT_CONSUMED;
 945 }
 946
 947 int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
 948 {
 949         struct ib_rmpp_mad *rmpp_mad;
 950         int ret;
 951
 952         rmpp_mad = mad_send_wr->send_buf.mad;
 953         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 954               IB_MGMT_RMPP_FLAG_ACTIVE))
 955                 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
 956
 957         if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count)
 958                 return IB_RMPP_RESULT_PROCESSED;
 959
 960         mad_send_wr->seg_num = mad_send_wr->last_ack;
 961         mad_send_wr->cur_seg = mad_send_wr->last_ack_seg;
 962
 963         ret = send_next_seg(mad_send_wr);
 964         if (ret)
 965                 return IB_RMPP_RESULT_PROCESSED;
 966
 967         return IB_RMPP_RESULT_CONSUMED;
 968 }