sys/ofed/drivers/infiniband/ulp/ipoib/ipoib_cm.c

   1 /*
   2  * Copyright (c) 2006 Mellanox Technologies. All rights reserved
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include "ipoib.h"
  34
  35 #ifdef CONFIG_INFINIBAND_IPOIB_CM
  36
  37 #include <netinet/ip.h>
  38 #include <netinet/ip_icmp.h>
  39 #include <netinet/icmp6.h>
  40
  41 #include <rdma/ib_cm.h>
  42 #include <rdma/ib_cache.h>
  43 #include <linux/delay.h>
  44
  45 int ipoib_max_conn_qp = 128;
  46
  47 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
  48 MODULE_PARM_DESC(max_nonsrq_conn_qp,
  49                  "Max number of connected-mode QPs per interface "
  50                  "(applied only if shared receive queue is not available)");
  51
  52 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  53 static int data_debug_level;
  54
  55 module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
  56 MODULE_PARM_DESC(cm_data_debug_level,
  57                  "Enable data path debug tracing for connected mode if > 0");
  58 #endif
  59
  60 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
  61
  62 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
  63 #define IPOIB_CM_RX_TIMEOUT     (2 * 256 * HZ)
  64 #define IPOIB_CM_RX_DELAY       (3 * 256 * HZ)
  65 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
  66
  67 static struct ib_qp_attr ipoib_cm_err_attr = {
  68         .qp_state = IB_QPS_ERR
  69 };
  70
  71 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
  72
  73 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
  74         .wr_id = IPOIB_CM_RX_DRAIN_WRID,
  75         .opcode = IB_WR_SEND,
  76 };
  77
  78 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
  79                                struct ib_cm_event *event);
  80
  81 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, struct ipoib_cm_rx_buf *rx_req)
  82 {
  83
  84         ipoib_dma_unmap_rx(priv, (struct ipoib_rx_buf *)rx_req);
  85
  86 }
  87
  88 static int ipoib_cm_post_receive_srq(struct ipoib_dev_priv *priv, int id)
  89 {
  90         struct ib_recv_wr *bad_wr;
  91         struct ipoib_rx_buf *rx_req;
  92         struct mbuf *m;
  93         int ret;
  94         int i;
  95
  96         rx_req = (struct ipoib_rx_buf *)&priv->cm.srq_ring[id];
  97         for (m = rx_req->mb, i = 0; m != NULL; m = m->m_next, i++) {
  98                 priv->cm.rx_sge[i].addr = rx_req->mapping[i];
  99                 priv->cm.rx_sge[i].length = m->m_len;
 100         }
 101
 102         priv->cm.rx_wr.num_sge = i;
 103         priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
 104
 105         ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
 106         if (unlikely(ret)) {
 107                 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
 108                 ipoib_dma_unmap_rx(priv, rx_req);
 109                 m_freem(priv->cm.srq_ring[id].mb);
 110                 priv->cm.srq_ring[id].mb = NULL;
 111         }
 112
 113         return ret;
 114 }
 115
 116 static int ipoib_cm_post_receive_nonsrq(struct ipoib_dev_priv *priv,
 117                                         struct ipoib_cm_rx *rx,
 118                                         struct ib_recv_wr *wr,
 119                                         struct ib_sge *sge, int id)
 120 {
 121         struct ipoib_rx_buf *rx_req;
 122         struct ib_recv_wr *bad_wr;
 123         struct mbuf *m;
 124         int ret;
 125         int i;
 126
 127         rx_req = (struct ipoib_rx_buf *)&rx->rx_ring[id];
 128         for (m = rx_req->mb, i = 0; m != NULL; m = m->m_next, i++) {
 129                 sge[i].addr = rx_req->mapping[i];
 130                 sge[i].length = m->m_len;
 131         }
 132
 133         wr->num_sge = i;
 134         wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
 135
 136         ret = ib_post_recv(rx->qp, wr, &bad_wr);
 137         if (unlikely(ret)) {
 138                 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
 139                 ipoib_dma_unmap_rx(priv, rx_req);
 140                 m_freem(rx->rx_ring[id].mb);
 141                 rx->rx_ring[id].mb = NULL;
 142         }
 143
 144         return ret;
 145 }
 146
 147 static struct mbuf *
 148 ipoib_cm_alloc_rx_mb(struct ipoib_dev_priv *priv, struct ipoib_cm_rx_buf *rx_req)
 149 {
 150         return ipoib_alloc_map_mb(priv, (struct ipoib_rx_buf *)rx_req,
 151             priv->cm.max_cm_mtu);
 152 }
 153
 154 static void ipoib_cm_free_rx_ring(struct ipoib_dev_priv *priv,
 155                                   struct ipoib_cm_rx_buf *rx_ring)
 156 {
 157         int i;
 158
 159         for (i = 0; i < ipoib_recvq_size; ++i)
 160                 if (rx_ring[i].mb) {
 161                         ipoib_cm_dma_unmap_rx(priv, &rx_ring[i]);
 162                         m_freem(rx_ring[i].mb);
 163                 }
 164
 165         kfree(rx_ring);
 166 }
 167
 168 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
 169 {
 170         struct ib_send_wr *bad_wr;
 171         struct ipoib_cm_rx *p;
 172
 173         /* We only reserved 1 extra slot in CQ for drain WRs, so
 174          * make sure we have at most 1 outstanding WR. */
 175         if (list_empty(&priv->cm.rx_flush_list) ||
 176             !list_empty(&priv->cm.rx_drain_list))
 177                 return;
 178
 179         /*
 180          * QPs on flush list are error state.  This way, a "flush
 181          * error" WC will be immediately generated for each WR we post.
 182          */
 183         p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
 184         if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
 185                 ipoib_warn(priv, "failed to post drain wr\n");
 186
 187         list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
 188 }
 189
 190 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
 191 {
 192         struct ipoib_cm_rx *p = ctx;
 193         struct ipoib_dev_priv *priv = p->priv;
 194         unsigned long flags;
 195
 196         if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
 197                 return;
 198
 199         spin_lock_irqsave(&priv->lock, flags);
 200         list_move(&p->list, &priv->cm.rx_flush_list);
 201         p->state = IPOIB_CM_RX_FLUSH;
 202         ipoib_cm_start_rx_drain(priv);
 203         spin_unlock_irqrestore(&priv->lock, flags);
 204 }
 205
 206 static struct ib_qp *ipoib_cm_create_rx_qp(struct ipoib_dev_priv *priv,
 207                                            struct ipoib_cm_rx *p)
 208 {
 209         struct ib_qp_init_attr attr = {
 210                 .event_handler = ipoib_cm_rx_event_handler,
 211                 .send_cq = priv->recv_cq, /* For drain WR */
 212                 .recv_cq = priv->recv_cq,
 213                 .srq = priv->cm.srq,
 214                 .cap.max_send_wr = 1, /* For drain WR */
 215                 .cap.max_send_sge = 1,
 216                 .sq_sig_type = IB_SIGNAL_ALL_WR,
 217                 .qp_type = IB_QPT_RC,
 218                 .qp_context = p,
 219         };
 220
 221         if (!ipoib_cm_has_srq(priv)) {
 222                 attr.cap.max_recv_wr  = ipoib_recvq_size;
 223                 attr.cap.max_recv_sge = priv->cm.num_frags;
 224         }
 225
 226         return ib_create_qp(priv->pd, &attr);
 227 }
 228
 229 static int ipoib_cm_modify_rx_qp(struct ipoib_dev_priv *priv,
 230                                  struct ib_cm_id *cm_id, struct ib_qp *qp,
 231                                  unsigned psn)
 232 {
 233         struct ib_qp_attr qp_attr;
 234         int qp_attr_mask, ret;
 235
 236         qp_attr.qp_state = IB_QPS_INIT;
 237         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 238         if (ret) {
 239                 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
 240                 return ret;
 241         }
 242         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 243         if (ret) {
 244                 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
 245                 return ret;
 246         }
 247         qp_attr.qp_state = IB_QPS_RTR;
 248         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 249         if (ret) {
 250                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 251                 return ret;
 252         }
 253         qp_attr.rq_psn = psn;
 254         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 255         if (ret) {
 256                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 257                 return ret;
 258         }
 259
 260         /*
 261          * Current Mellanox HCA firmware won't generate completions
 262          * with error for drain WRs unless the QP has been moved to
 263          * RTS first. This work-around leaves a window where a QP has
 264          * moved to error asynchronously, but this will eventually get
 265          * fixed in firmware, so let's not error out if modify QP
 266          * fails.
 267          */
 268         qp_attr.qp_state = IB_QPS_RTS;
 269         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 270         if (ret) {
 271                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 272                 return 0;
 273         }
 274         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 275         if (ret) {
 276                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 277                 return 0;
 278         }
 279
 280         return 0;
 281 }
 282
 283 static void ipoib_cm_init_rx_wr(struct ipoib_dev_priv *priv,
 284                                 struct ib_recv_wr *wr,
 285                                 struct ib_sge *sge)
 286 {
 287         int i;
 288
 289         for (i = 0; i < IPOIB_CM_RX_SG; i++)
 290                 sge[i].lkey = priv->pd->local_dma_lkey;
 291
 292         wr->next    = NULL;
 293         wr->sg_list = sge;
 294         wr->num_sge = 1;
 295 }
 296
 297 static int ipoib_cm_nonsrq_init_rx(struct ipoib_dev_priv *priv,
 298     struct ib_cm_id *cm_id, struct ipoib_cm_rx *rx)
 299 {
 300         struct {
 301                 struct ib_recv_wr wr;
 302                 struct ib_sge sge[IPOIB_CM_RX_SG];
 303         } *t;
 304         int ret;
 305         int i;
 306
 307         rx->rx_ring = kzalloc(ipoib_recvq_size * sizeof *rx->rx_ring, GFP_KERNEL);
 308         if (!rx->rx_ring) {
 309                 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n",
 310                        priv->ca->name, ipoib_recvq_size);
 311                 return -ENOMEM;
 312         }
 313
 314         memset(rx->rx_ring, 0, ipoib_recvq_size * sizeof *rx->rx_ring);
 315
 316         t = kmalloc(sizeof *t, GFP_KERNEL);
 317         if (!t) {
 318                 ret = -ENOMEM;
 319                 goto err_free;
 320         }
 321
 322         ipoib_cm_init_rx_wr(priv, &t->wr, t->sge);
 323
 324         spin_lock_irq(&priv->lock);
 325
 326         if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
 327                 spin_unlock_irq(&priv->lock);
 328                 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
 329                 ret = -EINVAL;
 330                 goto err_free;
 331         } else
 332                 ++priv->cm.nonsrq_conn_qp;
 333
 334         spin_unlock_irq(&priv->lock);
 335
 336         for (i = 0; i < ipoib_recvq_size; ++i) {
 337                 if (!ipoib_cm_alloc_rx_mb(priv, &rx->rx_ring[i])) {
 338                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 339                                 ret = -ENOMEM;
 340                                 goto err_count;
 341                 }
 342                 ret = ipoib_cm_post_receive_nonsrq(priv, rx, &t->wr, t->sge, i);
 343                 if (ret) {
 344                         ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
 345                                    "failed for buf %d\n", i);
 346                         ret = -EIO;
 347                         goto err_count;
 348                 }
 349         }
 350
 351         rx->recv_count = ipoib_recvq_size;
 352
 353         kfree(t);
 354
 355         return 0;
 356
 357 err_count:
 358         spin_lock_irq(&priv->lock);
 359         --priv->cm.nonsrq_conn_qp;
 360         spin_unlock_irq(&priv->lock);
 361
 362 err_free:
 363         kfree(t);
 364         ipoib_cm_free_rx_ring(priv, rx->rx_ring);
 365
 366         return ret;
 367 }
 368
 369 static int ipoib_cm_send_rep(struct ipoib_dev_priv *priv, struct ib_cm_id *cm_id,
 370                              struct ib_qp *qp, struct ib_cm_req_event_param *req,
 371                              unsigned psn)
 372 {
 373         struct ipoib_cm_data data = {};
 374         struct ib_cm_rep_param rep = {};
 375
 376         data.qpn = cpu_to_be32(priv->qp->qp_num);
 377         data.mtu = cpu_to_be32(priv->cm.max_cm_mtu);
 378
 379         rep.private_data = &data;
 380         rep.private_data_len = sizeof data;
 381         rep.flow_control = 0;
 382         rep.rnr_retry_count = req->rnr_retry_count;
 383         rep.srq = ipoib_cm_has_srq(priv);
 384         rep.qp_num = qp->qp_num;
 385         rep.starting_psn = psn;
 386         return ib_send_cm_rep(cm_id, &rep);
 387 }
 388
 389 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 390 {
 391         struct ipoib_dev_priv *priv = cm_id->context;
 392         struct ipoib_cm_rx *p;
 393         unsigned psn;
 394         int ret;
 395
 396         ipoib_dbg(priv, "REQ arrived\n");
 397         p = kzalloc(sizeof *p, GFP_KERNEL);
 398         if (!p)
 399                 return -ENOMEM;
 400         p->priv = priv;
 401         p->id = cm_id;
 402         cm_id->context = p;
 403         p->state = IPOIB_CM_RX_LIVE;
 404         p->jiffies = jiffies;
 405         INIT_LIST_HEAD(&p->list);
 406
 407         p->qp = ipoib_cm_create_rx_qp(priv, p);
 408         if (IS_ERR(p->qp)) {
 409                 ret = PTR_ERR(p->qp);
 410                 goto err_qp;
 411         }
 412
 413         psn = random() & 0xffffff;
 414         ret = ipoib_cm_modify_rx_qp(priv, cm_id, p->qp, psn);
 415         if (ret)
 416                 goto err_modify;
 417
 418         if (!ipoib_cm_has_srq(priv)) {
 419                 ret = ipoib_cm_nonsrq_init_rx(priv, cm_id, p);
 420                 if (ret)
 421                         goto err_modify;
 422         }
 423
 424         spin_lock_irq(&priv->lock);
 425         queue_delayed_work(ipoib_workqueue,
 426                            &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
 427         /* Add this entry to passive ids list head, but do not re-add it
 428          * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
 429         p->jiffies = jiffies;
 430         if (p->state == IPOIB_CM_RX_LIVE)
 431                 list_move(&p->list, &priv->cm.passive_ids);
 432         spin_unlock_irq(&priv->lock);
 433
 434         ret = ipoib_cm_send_rep(priv, cm_id, p->qp, &event->param.req_rcvd, psn);
 435         if (ret) {
 436                 ipoib_warn(priv, "failed to send REP: %d\n", ret);
 437                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 438                         ipoib_warn(priv, "unable to move qp to error state\n");
 439         }
 440         return 0;
 441
 442 err_modify:
 443         ib_destroy_qp(p->qp);
 444 err_qp:
 445         kfree(p);
 446         return ret;
 447 }
 448
 449 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
 450                                struct ib_cm_event *event)
 451 {
 452         struct ipoib_cm_rx *p;
 453         struct ipoib_dev_priv *priv;
 454
 455         switch (event->event) {
 456         case IB_CM_REQ_RECEIVED:
 457                 return ipoib_cm_req_handler(cm_id, event);
 458         case IB_CM_DREQ_RECEIVED:
 459                 p = cm_id->context;
 460                 ib_send_cm_drep(cm_id, NULL, 0);
 461                 /* Fall through */
 462         case IB_CM_REJ_RECEIVED:
 463                 p = cm_id->context;
 464                 priv = p->priv;
 465                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 466                         ipoib_warn(priv, "unable to move qp to error state\n");
 467                 /* Fall through */
 468         default:
 469                 return 0;
 470         }
 471 }
 472
 473 void ipoib_cm_handle_rx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc)
 474 {
 475         struct ipoib_cm_rx_buf saverx;
 476         struct ipoib_cm_rx_buf *rx_ring;
 477         unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
 478         struct ifnet *dev = priv->dev;
 479         struct mbuf *mb, *newmb;
 480         struct ipoib_cm_rx *p;
 481         int has_srq;
 482         u_short proto;
 483
 484         CURVNET_SET_QUIET(dev->if_vnet);
 485
 486         ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
 487                        wr_id, wc->status);
 488
 489         if (unlikely(wr_id >= ipoib_recvq_size)) {
 490                 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
 491                         spin_lock(&priv->lock);
 492                         list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
 493                         ipoib_cm_start_rx_drain(priv);
 494                         if (priv->cm.id != NULL)
 495                                 queue_work(ipoib_workqueue,
 496                                     &priv->cm.rx_reap_task);
 497                         spin_unlock(&priv->lock);
 498                 } else
 499                         ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
 500                                    wr_id, ipoib_recvq_size);
 501                 goto done;
 502         }
 503
 504         p = wc->qp->qp_context;
 505
 506         has_srq = ipoib_cm_has_srq(priv);
 507         rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
 508
 509         mb = rx_ring[wr_id].mb;
 510
 511         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 512                 ipoib_dbg(priv, "cm recv error "
 513                            "(status=%d, wrid=%d vend_err %x)\n",
 514                            wc->status, wr_id, wc->vendor_err);
 515                 if_inc_counter(dev, IFCOUNTER_IERRORS, 1);
 516                 if (has_srq)
 517                         goto repost;
 518                 else {
 519                         if (!--p->recv_count) {
 520                                 spin_lock(&priv->lock);
 521                                 list_move(&p->list, &priv->cm.rx_reap_list);
 522                                 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
 523                                 spin_unlock(&priv->lock);
 524                         }
 525                         goto done;
 526                 }
 527         }
 528
 529         if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
 530                 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
 531                         p->jiffies = jiffies;
 532                         /* Move this entry to list head, but do not re-add it
 533                          * if it has been moved out of list. */
 534                         if (p->state == IPOIB_CM_RX_LIVE)
 535                                 list_move(&p->list, &priv->cm.passive_ids);
 536                 }
 537         }
 538
 539         memcpy(&saverx, &rx_ring[wr_id], sizeof(saverx));
 540         newmb = ipoib_cm_alloc_rx_mb(priv, &rx_ring[wr_id]);
 541         if (unlikely(!newmb)) {
 542                 /*
 543                  * If we can't allocate a new RX buffer, dump
 544                  * this packet and reuse the old buffer.
 545                  */
 546                 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
 547                 if_inc_counter(dev, IFCOUNTER_IERRORS, 1);
 548                 memcpy(&rx_ring[wr_id], &saverx, sizeof(saverx));
 549                 goto repost;
 550         }
 551
 552         ipoib_cm_dma_unmap_rx(priv, &saverx);
 553
 554         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 555                        wc->byte_len, wc->slid);
 556
 557         ipoib_dma_mb(priv, mb, wc->byte_len);
 558
 559         if_inc_counter(dev, IFCOUNTER_IPACKETS, 1);
 560         if_inc_counter(dev, IFCOUNTER_IBYTES, mb->m_pkthdr.len);
 561
 562         mb->m_pkthdr.rcvif = dev;
 563         proto = *mtod(mb, uint16_t *);
 564         m_adj(mb, IPOIB_ENCAP_LEN);
 565
 566         IPOIB_MTAP_PROTO(dev, mb, proto);
 567         ipoib_demux(dev, mb, ntohs(proto));
 568
 569 repost:
 570         if (has_srq) {
 571                 if (unlikely(ipoib_cm_post_receive_srq(priv, wr_id)))
 572                         ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
 573                                    "for buf %d\n", wr_id);
 574         } else {
 575                 if (unlikely(ipoib_cm_post_receive_nonsrq(priv, p,
 576                                                           &priv->cm.rx_wr,
 577                                                           priv->cm.rx_sge,
 578                                                           wr_id))) {
 579                         --p->recv_count;
 580                         ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
 581                                    "for buf %d\n", wr_id);
 582                 }
 583         }
 584 done:
 585         CURVNET_RESTORE();
 586         return;
 587 }
 588
 589 static inline int post_send(struct ipoib_dev_priv *priv,
 590                             struct ipoib_cm_tx *tx,
 591                             struct ipoib_cm_tx_buf *tx_req,
 592                             unsigned int wr_id)
 593 {
 594         struct ib_send_wr *bad_wr;
 595         struct mbuf *mb = tx_req->mb;
 596         u64 *mapping = tx_req->mapping;
 597         struct mbuf *m;
 598         int i;
 599
 600         for (m = mb, i = 0; m != NULL; m = m->m_next, i++) {
 601                 priv->tx_sge[i].addr = mapping[i];
 602                 priv->tx_sge[i].length = m->m_len;
 603         }
 604         priv->tx_wr.wr.num_sge = i;
 605         priv->tx_wr.wr.wr_id = wr_id | IPOIB_OP_CM;
 606         priv->tx_wr.wr.opcode = IB_WR_SEND;
 607
 608         return ib_post_send(tx->qp, &priv->tx_wr.wr, &bad_wr);
 609 }
 610
 611 void ipoib_cm_send(struct ipoib_dev_priv *priv, struct mbuf *mb, struct ipoib_cm_tx *tx)
 612 {
 613         struct ipoib_cm_tx_buf *tx_req;
 614         struct ifnet *dev = priv->dev;
 615
 616         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
 617                 while (ipoib_poll_tx(priv)); /* nothing */
 618
 619         m_adj(mb, sizeof(struct ipoib_pseudoheader));
 620         if (unlikely(mb->m_pkthdr.len > tx->mtu)) {
 621                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 622                            mb->m_pkthdr.len, tx->mtu);
 623                 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 624                 ipoib_cm_mb_too_long(priv, mb, IPOIB_CM_MTU(tx->mtu));
 625                 return;
 626         }
 627
 628         ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
 629                        tx->tx_head, mb->m_pkthdr.len, tx->qp->qp_num);
 630
 631
 632         /*
 633          * We put the mb into the tx_ring _before_ we call post_send()
 634          * because it's entirely possible that the completion handler will
 635          * run before we execute anything after the post_send().  That
 636          * means we have to make sure everything is properly recorded and
 637          * our state is consistent before we call post_send().
 638          */
 639         tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
 640         tx_req->mb = mb;
 641         if (unlikely(ipoib_dma_map_tx(priv->ca, (struct ipoib_tx_buf *)tx_req,
 642             priv->cm.num_frags))) {
 643                 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 644                 if (tx_req->mb)
 645                         m_freem(tx_req->mb);
 646                 return;
 647         }
 648
 649         if (unlikely(post_send(priv, tx, tx_req, tx->tx_head & (ipoib_sendq_size - 1)))) {
 650                 ipoib_warn(priv, "post_send failed\n");
 651                 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 652                 ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req);
 653                 m_freem(mb);
 654         } else {
 655                 ++tx->tx_head;
 656
 657                 if (++priv->tx_outstanding == ipoib_sendq_size) {
 658                         ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
 659                                   tx->qp->qp_num);
 660                         if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
 661                                 ipoib_warn(priv, "request notify on send CQ failed\n");
 662                         dev->if_drv_flags |= IFF_DRV_OACTIVE;
 663                 }
 664         }
 665
 666 }
 667
 668 void ipoib_cm_handle_tx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc)
 669 {
 670         struct ipoib_cm_tx *tx = wc->qp->qp_context;
 671         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
 672         struct ifnet *dev = priv->dev;
 673         struct ipoib_cm_tx_buf *tx_req;
 674
 675         ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
 676                        wr_id, wc->status);
 677
 678         if (unlikely(wr_id >= ipoib_sendq_size)) {
 679                 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
 680                            wr_id, ipoib_sendq_size);
 681                 return;
 682         }
 683
 684         tx_req = &tx->tx_ring[wr_id];
 685
 686         ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req);
 687
 688         /* FIXME: is this right? Shouldn't we only increment on success? */
 689         if_inc_counter(dev, IFCOUNTER_OPACKETS, 1);
 690
 691         m_freem(tx_req->mb);
 692
 693         ++tx->tx_tail;
 694         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 695             (dev->if_drv_flags & IFF_DRV_OACTIVE) != 0 &&
 696             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 697                 dev->if_drv_flags &= ~IFF_DRV_OACTIVE;
 698
 699         if (wc->status != IB_WC_SUCCESS &&
 700             wc->status != IB_WC_WR_FLUSH_ERR) {
 701                 struct ipoib_path *path;
 702
 703                 ipoib_dbg(priv, "failed cm send event "
 704                            "(status=%d, wrid=%d vend_err %x)\n",
 705                            wc->status, wr_id, wc->vendor_err);
 706
 707                 path = tx->path;
 708
 709                 if (path) {
 710                         path->cm = NULL;
 711                         rb_erase(&path->rb_node, &priv->path_tree);
 712                         list_del(&path->list);
 713                 }
 714
 715                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 716                         list_move(&tx->list, &priv->cm.reap_list);
 717                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
 718                 }
 719
 720                 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
 721         }
 722
 723 }
 724
 725 int ipoib_cm_dev_open(struct ipoib_dev_priv *priv)
 726 {
 727         int ret;
 728
 729         if (!IPOIB_CM_SUPPORTED(IF_LLADDR(priv->dev)))
 730                 return 0;
 731
 732         priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, priv);
 733         if (IS_ERR(priv->cm.id)) {
 734                 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
 735                 ret = PTR_ERR(priv->cm.id);
 736                 goto err_cm;
 737         }
 738
 739         ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), 0);
 740         if (ret) {
 741                 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
 742                        IPOIB_CM_IETF_ID | priv->qp->qp_num);
 743                 goto err_listen;
 744         }
 745
 746         return 0;
 747
 748 err_listen:
 749         ib_destroy_cm_id(priv->cm.id);
 750 err_cm:
 751         priv->cm.id = NULL;
 752         return ret;
 753 }
 754
 755 static void ipoib_cm_free_rx_reap_list(struct ipoib_dev_priv *priv)
 756 {
 757         struct ipoib_cm_rx *rx, *n;
 758         LIST_HEAD(list);
 759
 760         spin_lock_irq(&priv->lock);
 761         list_splice_init(&priv->cm.rx_reap_list, &list);
 762         spin_unlock_irq(&priv->lock);
 763
 764         list_for_each_entry_safe(rx, n, &list, list) {
 765                 ib_destroy_cm_id(rx->id);
 766                 ib_destroy_qp(rx->qp);
 767                 if (!ipoib_cm_has_srq(priv)) {
 768                         ipoib_cm_free_rx_ring(priv, rx->rx_ring);
 769                         spin_lock_irq(&priv->lock);
 770                         --priv->cm.nonsrq_conn_qp;
 771                         spin_unlock_irq(&priv->lock);
 772                 }
 773                 kfree(rx);
 774         }
 775 }
 776
 777 void ipoib_cm_dev_stop(struct ipoib_dev_priv *priv)
 778 {
 779         struct ipoib_cm_rx *p;
 780         unsigned long begin;
 781         int ret;
 782
 783         if (!IPOIB_CM_SUPPORTED(IF_LLADDR(priv->dev)) || !priv->cm.id)
 784                 return;
 785
 786         ib_destroy_cm_id(priv->cm.id);
 787         priv->cm.id = NULL;
 788
 789         cancel_work_sync(&priv->cm.rx_reap_task);
 790
 791         spin_lock_irq(&priv->lock);
 792         while (!list_empty(&priv->cm.passive_ids)) {
 793                 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
 794                 list_move(&p->list, &priv->cm.rx_error_list);
 795                 p->state = IPOIB_CM_RX_ERROR;
 796                 spin_unlock_irq(&priv->lock);
 797                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
 798                 if (ret)
 799                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
 800                 spin_lock_irq(&priv->lock);
 801         }
 802
 803         /* Wait for all RX to be drained */
 804         begin = jiffies;
 805
 806         while (!list_empty(&priv->cm.rx_error_list) ||
 807                !list_empty(&priv->cm.rx_flush_list) ||
 808                !list_empty(&priv->cm.rx_drain_list)) {
 809                 if (time_after(jiffies, begin + 5 * HZ)) {
 810                         ipoib_warn(priv, "RX drain timing out\n");
 811
 812                         /*
 813                          * assume the HW is wedged and just free up everything.
 814                          */
 815                         list_splice_init(&priv->cm.rx_flush_list,
 816                                          &priv->cm.rx_reap_list);
 817                         list_splice_init(&priv->cm.rx_error_list,
 818                                          &priv->cm.rx_reap_list);
 819                         list_splice_init(&priv->cm.rx_drain_list,
 820                                          &priv->cm.rx_reap_list);
 821                         break;
 822                 }
 823                 spin_unlock_irq(&priv->lock);
 824                 msleep(1);
 825                 ipoib_drain_cq(priv);
 826                 spin_lock_irq(&priv->lock);
 827         }
 828
 829         spin_unlock_irq(&priv->lock);
 830
 831         ipoib_cm_free_rx_reap_list(priv);
 832
 833         cancel_delayed_work_sync(&priv->cm.stale_task);
 834 }
 835
 836 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 837 {
 838         struct ipoib_cm_tx *p = cm_id->context;
 839         struct ipoib_dev_priv *priv = p->priv;
 840         struct ipoib_cm_data *data = event->private_data;
 841         struct ifqueue mbqueue;
 842         struct ib_qp_attr qp_attr;
 843         int qp_attr_mask, ret;
 844         struct mbuf *mb;
 845
 846         ipoib_dbg(priv, "cm rep handler\n");
 847         p->mtu = be32_to_cpu(data->mtu);
 848
 849         if (p->mtu <= IPOIB_ENCAP_LEN) {
 850                 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
 851                            p->mtu, IPOIB_ENCAP_LEN);
 852                 return -EINVAL;
 853         }
 854
 855         qp_attr.qp_state = IB_QPS_RTR;
 856         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 857         if (ret) {
 858                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 859                 return ret;
 860         }
 861
 862         qp_attr.rq_psn = 0 /* FIXME */;
 863         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 864         if (ret) {
 865                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 866                 return ret;
 867         }
 868
 869         qp_attr.qp_state = IB_QPS_RTS;
 870         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 871         if (ret) {
 872                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 873                 return ret;
 874         }
 875         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 876         if (ret) {
 877                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 878                 return ret;
 879         }
 880
 881         bzero(&mbqueue, sizeof(mbqueue));
 882
 883         spin_lock_irq(&priv->lock);
 884         set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
 885         if (p->path)
 886                 for (;;) {
 887                         _IF_DEQUEUE(&p->path->queue, mb);
 888                         if (mb == NULL)
 889                                 break;
 890                         _IF_ENQUEUE(&mbqueue, mb);
 891                 }
 892         spin_unlock_irq(&priv->lock);
 893
 894         for (;;) {
 895                 struct ifnet *dev = p->priv->dev;
 896                 _IF_DEQUEUE(&mbqueue, mb);
 897                 if (mb == NULL)
 898                         break;
 899                 mb->m_pkthdr.rcvif = dev;
 900                 if (dev->if_transmit(dev, mb))
 901                         ipoib_warn(priv, "dev_queue_xmit failed "
 902                                    "to requeue packet\n");
 903         }
 904
 905         ret = ib_send_cm_rtu(cm_id, NULL, 0);
 906         if (ret) {
 907                 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
 908                 return ret;
 909         }
 910         return 0;
 911 }
 912
 913 static struct ib_qp *ipoib_cm_create_tx_qp(struct ipoib_dev_priv *priv,
 914     struct ipoib_cm_tx *tx)
 915 {
 916         struct ib_qp_init_attr attr = {
 917                 .send_cq                = priv->send_cq,
 918                 .recv_cq                = priv->recv_cq,
 919                 .srq                    = priv->cm.srq,
 920                 .cap.max_send_wr        = ipoib_sendq_size,
 921                 .cap.max_send_sge       = priv->cm.num_frags,
 922                 .sq_sig_type            = IB_SIGNAL_ALL_WR,
 923                 .qp_type                = IB_QPT_RC,
 924                 .qp_context             = tx
 925         };
 926
 927         return ib_create_qp(priv->pd, &attr);
 928 }
 929
 930 static int ipoib_cm_send_req(struct ipoib_dev_priv *priv,
 931                              struct ib_cm_id *id, struct ib_qp *qp,
 932                              u32 qpn,
 933                              struct ib_sa_path_rec *pathrec)
 934 {
 935         struct ipoib_cm_data data = {};
 936         struct ib_cm_req_param req = {};
 937
 938         ipoib_dbg(priv, "cm send req\n");
 939
 940         data.qpn = cpu_to_be32(priv->qp->qp_num);
 941         data.mtu = cpu_to_be32(priv->cm.max_cm_mtu);
 942
 943         req.primary_path                = pathrec;
 944         req.alternate_path              = NULL;
 945         req.service_id                  = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
 946         req.qp_num                      = qp->qp_num;
 947         req.qp_type                     = qp->qp_type;
 948         req.private_data                = &data;
 949         req.private_data_len            = sizeof data;
 950         req.flow_control                = 0;
 951
 952         req.starting_psn                = 0; /* FIXME */
 953
 954         /*
 955          * Pick some arbitrary defaults here; we could make these
 956          * module parameters if anyone cared about setting them.
 957          */
 958         req.responder_resources         = 4;
 959         req.remote_cm_response_timeout  = 20;
 960         req.local_cm_response_timeout   = 20;
 961         req.retry_count                 = 0; /* RFC draft warns against retries */
 962         req.rnr_retry_count             = 0; /* RFC draft warns against retries */
 963         req.max_cm_retries              = 15;
 964         req.srq                         = ipoib_cm_has_srq(priv);
 965         return ib_send_cm_req(id, &req);
 966 }
 967
 968 static int ipoib_cm_modify_tx_init(struct ipoib_dev_priv *priv,
 969                                   struct ib_cm_id *cm_id, struct ib_qp *qp)
 970 {
 971         struct ib_qp_attr qp_attr;
 972         int qp_attr_mask, ret;
 973         ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
 974         if (ret) {
 975                 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
 976                 return ret;
 977         }
 978
 979         qp_attr.qp_state = IB_QPS_INIT;
 980         qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
 981         qp_attr.port_num = priv->port;
 982         qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
 983
 984         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 985         if (ret) {
 986                 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
 987                 return ret;
 988         }
 989         return 0;
 990 }
 991
 992 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
 993                             struct ib_sa_path_rec *pathrec)
 994 {
 995         struct ipoib_dev_priv *priv = p->priv;
 996         int ret;
 997
 998         p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring, GFP_KERNEL);
 999         if (!p->tx_ring) {
1000                 ipoib_warn(priv, "failed to allocate tx ring\n");
1001                 ret = -ENOMEM;
1002                 goto err_tx;
1003         }
1004         memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1005
1006         p->qp = ipoib_cm_create_tx_qp(p->priv, p);
1007         if (IS_ERR(p->qp)) {
1008                 ret = PTR_ERR(p->qp);
1009                 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1010                 goto err_qp;
1011         }
1012
1013         p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1014         if (IS_ERR(p->id)) {
1015                 ret = PTR_ERR(p->id);
1016                 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1017                 goto err_id;
1018         }
1019
1020         ret = ipoib_cm_modify_tx_init(p->priv, p->id,  p->qp);
1021         if (ret) {
1022                 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1023                 goto err_modify;
1024         }
1025
1026         ret = ipoib_cm_send_req(p->priv, p->id, p->qp, qpn, pathrec);
1027         if (ret) {
1028                 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1029                 goto err_send_cm;
1030         }
1031
1032         ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1033                   p->qp->qp_num, pathrec->dgid.raw, qpn);
1034
1035         return 0;
1036
1037 err_send_cm:
1038 err_modify:
1039         ib_destroy_cm_id(p->id);
1040 err_id:
1041         p->id = NULL;
1042         ib_destroy_qp(p->qp);
1043 err_qp:
1044         p->qp = NULL;
1045         kfree(p->tx_ring);
1046 err_tx:
1047         return ret;
1048 }
1049
1050 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1051 {
1052         struct ipoib_dev_priv *priv = p->priv;
1053         struct ifnet *dev = priv->dev;
1054         struct ipoib_cm_tx_buf *tx_req;
1055         unsigned long begin;
1056
1057         ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1058                   p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1059
1060         if (p->path)
1061                 ipoib_path_free(priv, p->path);
1062
1063         if (p->id)
1064                 ib_destroy_cm_id(p->id);
1065
1066         if (p->tx_ring) {
1067                 /* Wait for all sends to complete */
1068                 begin = jiffies;
1069                 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1070                         if (time_after(jiffies, begin + 5 * HZ)) {
1071                                 ipoib_warn(priv, "timing out; %d sends not completed\n",
1072                                            p->tx_head - p->tx_tail);
1073                                 goto timeout;
1074                         }
1075
1076                         msleep(1);
1077                 }
1078         }
1079
1080 timeout:
1081
1082         while ((int) p->tx_tail - (int) p->tx_head < 0) {
1083                 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1084                 ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req);
1085                 m_freem(tx_req->mb);
1086                 ++p->tx_tail;
1087                 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1088                     (dev->if_drv_flags & IFF_DRV_OACTIVE) != 0 &&
1089                     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1090                         dev->if_drv_flags &= ~IFF_DRV_OACTIVE;
1091         }
1092
1093         if (p->qp)
1094                 ib_destroy_qp(p->qp);
1095
1096         kfree(p->tx_ring);
1097         kfree(p);
1098 }
1099
1100 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1101                                struct ib_cm_event *event)
1102 {
1103         struct ipoib_cm_tx *tx = cm_id->context;
1104         struct ipoib_dev_priv *priv = tx->priv;
1105         struct ipoib_path *path;
1106         unsigned long flags;
1107         int ret;
1108
1109         switch (event->event) {
1110         case IB_CM_DREQ_RECEIVED:
1111                 ipoib_dbg(priv, "DREQ received.\n");
1112                 ib_send_cm_drep(cm_id, NULL, 0);
1113                 break;
1114         case IB_CM_REP_RECEIVED:
1115                 ipoib_dbg(priv, "REP received.\n");
1116                 ret = ipoib_cm_rep_handler(cm_id, event);
1117                 if (ret)
1118                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1119                                        NULL, 0, NULL, 0);
1120                 break;
1121         case IB_CM_REQ_ERROR:
1122         case IB_CM_REJ_RECEIVED:
1123         case IB_CM_TIMEWAIT_EXIT:
1124                 ipoib_dbg(priv, "CM error %d.\n", event->event);
1125                 spin_lock_irqsave(&priv->lock, flags);
1126                 path = tx->path;
1127
1128                 if (path) {
1129                         path->cm = NULL;
1130                         tx->path = NULL;
1131                         rb_erase(&path->rb_node, &priv->path_tree);
1132                         list_del(&path->list);
1133                 }
1134
1135                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1136                         list_move(&tx->list, &priv->cm.reap_list);
1137                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
1138                 }
1139
1140                 spin_unlock_irqrestore(&priv->lock, flags);
1141                 if (path)
1142                         ipoib_path_free(tx->priv, path);
1143                 break;
1144         default:
1145                 break;
1146         }
1147
1148         return 0;
1149 }
1150
1151 struct ipoib_cm_tx *ipoib_cm_create_tx(struct ipoib_dev_priv *priv,
1152     struct ipoib_path *path)
1153 {
1154         struct ipoib_cm_tx *tx;
1155
1156         tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1157         if (!tx)
1158                 return NULL;
1159
1160         ipoib_dbg(priv, "Creating cm tx\n");
1161         path->cm = tx;
1162         tx->path = path;
1163         tx->priv = priv;
1164         list_add(&tx->list, &priv->cm.start_list);
1165         set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1166         queue_work(ipoib_workqueue, &priv->cm.start_task);
1167         return tx;
1168 }
1169
1170 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1171 {
1172         struct ipoib_dev_priv *priv = tx->priv;
1173         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1174                 spin_lock(&priv->lock);
1175                 list_move(&tx->list, &priv->cm.reap_list);
1176                 spin_unlock(&priv->lock);
1177                 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1178                 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1179                           tx->path->pathrec.dgid.raw);
1180                 tx->path = NULL;
1181         }
1182 }
1183
1184 static void ipoib_cm_tx_start(struct work_struct *work)
1185 {
1186         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1187                                                    cm.start_task);
1188         struct ipoib_path *path;
1189         struct ipoib_cm_tx *p;
1190         unsigned long flags;
1191         int ret;
1192
1193         struct ib_sa_path_rec pathrec;
1194         u32 qpn;
1195
1196         ipoib_dbg(priv, "cm start task\n");
1197         spin_lock_irqsave(&priv->lock, flags);
1198
1199         while (!list_empty(&priv->cm.start_list)) {
1200                 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1201                 list_del_init(&p->list);
1202                 path = p->path;
1203                 qpn = IPOIB_QPN(path->hwaddr);
1204                 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1205
1206                 spin_unlock_irqrestore(&priv->lock, flags);
1207
1208                 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1209
1210                 spin_lock_irqsave(&priv->lock, flags);
1211
1212                 if (ret) {
1213                         path = p->path;
1214                         if (path) {
1215                                 path->cm = NULL;
1216                                 rb_erase(&path->rb_node, &priv->path_tree);
1217                                 list_del(&path->list);
1218                                 ipoib_path_free(priv, path);
1219                         }
1220                         list_del(&p->list);
1221                         kfree(p);
1222                 }
1223         }
1224
1225         spin_unlock_irqrestore(&priv->lock, flags);
1226 }
1227
1228 static void ipoib_cm_tx_reap(struct work_struct *work)
1229 {
1230         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1231                                                    cm.reap_task);
1232         struct ipoib_cm_tx *p;
1233         unsigned long flags;
1234
1235         spin_lock_irqsave(&priv->lock, flags);
1236
1237         while (!list_empty(&priv->cm.reap_list)) {
1238                 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1239                 list_del(&p->list);
1240                 spin_unlock_irqrestore(&priv->lock, flags);
1241                 ipoib_cm_tx_destroy(p);
1242                 spin_lock_irqsave(&priv->lock, flags);
1243         }
1244
1245         spin_unlock_irqrestore(&priv->lock, flags);
1246 }
1247
1248 static void ipoib_cm_mb_reap(struct work_struct *work)
1249 {
1250         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1251                                                    cm.mb_task);
1252         struct mbuf *mb;
1253         unsigned long flags;
1254 #if defined(INET) || defined(INET6)
1255         unsigned mtu = priv->mcast_mtu;
1256 #endif
1257         uint16_t proto;
1258
1259         spin_lock_irqsave(&priv->lock, flags);
1260
1261         for (;;) {
1262                 IF_DEQUEUE(&priv->cm.mb_queue, mb);
1263                 if (mb == NULL)
1264                         break;
1265                 spin_unlock_irqrestore(&priv->lock, flags);
1266
1267                 proto = htons(*mtod(mb, uint16_t *));
1268                 m_adj(mb, IPOIB_ENCAP_LEN);
1269                 switch (proto) {
1270 #if defined(INET)
1271                 case ETHERTYPE_IP:
1272                         icmp_error(mb, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, mtu);
1273                         break;
1274 #endif
1275 #if defined(INET6)
1276                 case ETHERTYPE_IPV6:
1277                         icmp6_error(mb, ICMP6_PACKET_TOO_BIG, 0, mtu);
1278                         break;
1279 #endif
1280                 default:
1281                         m_freem(mb);
1282                 }
1283
1284                 spin_lock_irqsave(&priv->lock, flags);
1285         }
1286
1287         spin_unlock_irqrestore(&priv->lock, flags);
1288 }
1289
1290 void
1291 ipoib_cm_mb_too_long(struct ipoib_dev_priv *priv, struct mbuf *mb, unsigned int mtu)
1292 {
1293         int e = priv->cm.mb_queue.ifq_len;
1294
1295         IF_ENQUEUE(&priv->cm.mb_queue, mb);
1296         if (e == 0)
1297                 queue_work(ipoib_workqueue, &priv->cm.mb_task);
1298 }
1299
1300 static void ipoib_cm_rx_reap(struct work_struct *work)
1301 {
1302         ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1303                                                 cm.rx_reap_task));
1304 }
1305
1306 static void ipoib_cm_stale_task(struct work_struct *work)
1307 {
1308         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1309                                                    cm.stale_task.work);
1310         struct ipoib_cm_rx *p;
1311         int ret;
1312
1313         spin_lock_irq(&priv->lock);
1314         while (!list_empty(&priv->cm.passive_ids)) {
1315                 /* List is sorted by LRU, start from tail,
1316                  * stop when we see a recently used entry */
1317                 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1318                 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1319                         break;
1320                 list_move(&p->list, &priv->cm.rx_error_list);
1321                 p->state = IPOIB_CM_RX_ERROR;
1322                 spin_unlock_irq(&priv->lock);
1323                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1324                 if (ret)
1325                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1326                 spin_lock_irq(&priv->lock);
1327         }
1328
1329         if (!list_empty(&priv->cm.passive_ids))
1330                 queue_delayed_work(ipoib_workqueue,
1331                                    &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1332         spin_unlock_irq(&priv->lock);
1333 }
1334
1335
1336 static void ipoib_cm_create_srq(struct ipoib_dev_priv *priv, int max_sge)
1337 {
1338         struct ib_srq_init_attr srq_init_attr = {
1339                 .attr = {
1340                         .max_wr  = ipoib_recvq_size,
1341                         .max_sge = max_sge
1342                 }
1343         };
1344
1345         priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1346         if (IS_ERR(priv->cm.srq)) {
1347                 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1348                         printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1349                                priv->ca->name, PTR_ERR(priv->cm.srq));
1350                 priv->cm.srq = NULL;
1351                 return;
1352         }
1353
1354         priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring, GFP_KERNEL);
1355         if (!priv->cm.srq_ring) {
1356                 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n",
1357                        priv->ca->name, ipoib_recvq_size);
1358                 ib_destroy_srq(priv->cm.srq);
1359                 priv->cm.srq = NULL;
1360                 return;
1361         }
1362
1363         memset(priv->cm.srq_ring, 0, ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1364 }
1365
1366 int ipoib_cm_dev_init(struct ipoib_dev_priv *priv)
1367 {
1368         struct ifnet *dev = priv->dev;
1369         int i;
1370         int max_srq_sge;
1371
1372         INIT_LIST_HEAD(&priv->cm.passive_ids);
1373         INIT_LIST_HEAD(&priv->cm.reap_list);
1374         INIT_LIST_HEAD(&priv->cm.start_list);
1375         INIT_LIST_HEAD(&priv->cm.rx_error_list);
1376         INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1377         INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1378         INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1379         INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1380         INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1381         INIT_WORK(&priv->cm.mb_task, ipoib_cm_mb_reap);
1382         INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1383         INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1384
1385         bzero(&priv->cm.mb_queue, sizeof(priv->cm.mb_queue));
1386         mtx_init(&priv->cm.mb_queue.ifq_mtx,
1387             dev->if_xname, "if send queue", MTX_DEF);
1388
1389         max_srq_sge = priv->ca->attrs.max_srq_sge;
1390
1391         ipoib_dbg(priv, "max_srq_sge=%d\n", max_srq_sge);
1392
1393         max_srq_sge = min_t(int, IPOIB_CM_RX_SG, max_srq_sge);
1394         ipoib_cm_create_srq(priv, max_srq_sge);
1395         if (ipoib_cm_has_srq(priv)) {
1396                 priv->cm.max_cm_mtu = max_srq_sge * MJUMPAGESIZE;
1397                 priv->cm.num_frags  = max_srq_sge;
1398                 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1399                           priv->cm.max_cm_mtu, priv->cm.num_frags);
1400         } else {
1401                 priv->cm.max_cm_mtu = IPOIB_CM_MAX_MTU;
1402                 priv->cm.num_frags  = IPOIB_CM_RX_SG;
1403         }
1404
1405         ipoib_cm_init_rx_wr(priv, &priv->cm.rx_wr, priv->cm.rx_sge);
1406
1407         if (ipoib_cm_has_srq(priv)) {
1408                 for (i = 0; i < ipoib_recvq_size; ++i) {
1409                         if (!ipoib_cm_alloc_rx_mb(priv, &priv->cm.srq_ring[i])) {
1410                                 ipoib_warn(priv, "failed to allocate "
1411                                            "receive buffer %d\n", i);
1412                                 ipoib_cm_dev_cleanup(priv);
1413                                 return -ENOMEM;
1414                         }
1415
1416                         if (ipoib_cm_post_receive_srq(priv, i)) {
1417                                 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1418                                            "failed for buf %d\n", i);
1419                                 ipoib_cm_dev_cleanup(priv);
1420                                 return -EIO;
1421                         }
1422                 }
1423         }
1424
1425         IF_LLADDR(priv->dev)[0] = IPOIB_FLAGS_RC;
1426         return 0;
1427 }
1428
1429 void ipoib_cm_dev_cleanup(struct ipoib_dev_priv *priv)
1430 {
1431         int ret;
1432
1433         if (!priv->cm.srq)
1434                 return;
1435
1436         ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1437
1438         ret = ib_destroy_srq(priv->cm.srq);
1439         if (ret)
1440                 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1441
1442         priv->cm.srq = NULL;
1443         if (!priv->cm.srq_ring)
1444                 return;
1445
1446         ipoib_cm_free_rx_ring(priv, priv->cm.srq_ring);
1447         priv->cm.srq_ring = NULL;
1448
1449         mtx_destroy(&priv->cm.mb_queue.ifq_mtx);
1450 }
1451
1452 #endif /* CONFIG_INFINIBAND_IPOIB_CM */