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->mr->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                 ++dev->if_ierrors;
 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                 ++dev->if_ierrors;
 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         ++dev->if_ipackets;
 560         dev->if_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.num_sge = i;
 605         priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM;
 606         priv->tx_wr.opcode = IB_WR_SEND;
 607
 608         return ib_post_send(tx->qp, &priv->tx_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                 ++dev->if_oerrors;
 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                 ++dev->if_oerrors;
 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                 ++dev->if_oerrors;
 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         ++dev->if_opackets;
 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),
 740                            0, NULL);
 741         if (ret) {
 742                 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
 743                        IPOIB_CM_IETF_ID | priv->qp->qp_num);
 744                 goto err_listen;
 745         }
 746
 747         return 0;
 748
 749 err_listen:
 750         ib_destroy_cm_id(priv->cm.id);
 751 err_cm:
 752         priv->cm.id = NULL;
 753         return ret;
 754 }
 755
 756 static void ipoib_cm_free_rx_reap_list(struct ipoib_dev_priv *priv)
 757 {
 758         struct ipoib_cm_rx *rx, *n;
 759         LIST_HEAD(list);
 760
 761         spin_lock_irq(&priv->lock);
 762         list_splice_init(&priv->cm.rx_reap_list, &list);
 763         spin_unlock_irq(&priv->lock);
 764
 765         list_for_each_entry_safe(rx, n, &list, list) {
 766                 ib_destroy_cm_id(rx->id);
 767                 ib_destroy_qp(rx->qp);
 768                 if (!ipoib_cm_has_srq(priv)) {
 769                         ipoib_cm_free_rx_ring(priv, rx->rx_ring);
 770                         spin_lock_irq(&priv->lock);
 771                         --priv->cm.nonsrq_conn_qp;
 772                         spin_unlock_irq(&priv->lock);
 773                 }
 774                 kfree(rx);
 775         }
 776 }
 777
 778 void ipoib_cm_dev_stop(struct ipoib_dev_priv *priv)
 779 {
 780         struct ipoib_cm_rx *p;
 781         unsigned long begin;
 782         int ret;
 783
 784         if (!IPOIB_CM_SUPPORTED(IF_LLADDR(priv->dev)) || !priv->cm.id)
 785                 return;
 786
 787         ib_destroy_cm_id(priv->cm.id);
 788         priv->cm.id = NULL;
 789
 790         cancel_work_sync(&priv->cm.rx_reap_task);
 791
 792         spin_lock_irq(&priv->lock);
 793         while (!list_empty(&priv->cm.passive_ids)) {
 794                 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
 795                 list_move(&p->list, &priv->cm.rx_error_list);
 796                 p->state = IPOIB_CM_RX_ERROR;
 797                 spin_unlock_irq(&priv->lock);
 798                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
 799                 if (ret)
 800                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
 801                 spin_lock_irq(&priv->lock);
 802         }
 803
 804         /* Wait for all RX to be drained */
 805         begin = jiffies;
 806
 807         while (!list_empty(&priv->cm.rx_error_list) ||
 808                !list_empty(&priv->cm.rx_flush_list) ||
 809                !list_empty(&priv->cm.rx_drain_list)) {
 810                 if (time_after(jiffies, begin + 5 * HZ)) {
 811                         ipoib_warn(priv, "RX drain timing out\n");
 812
 813                         /*
 814                          * assume the HW is wedged and just free up everything.
 815                          */
 816                         list_splice_init(&priv->cm.rx_flush_list,
 817                                          &priv->cm.rx_reap_list);
 818                         list_splice_init(&priv->cm.rx_error_list,
 819                                          &priv->cm.rx_reap_list);
 820                         list_splice_init(&priv->cm.rx_drain_list,
 821                                          &priv->cm.rx_reap_list);
 822                         break;
 823                 }
 824                 spin_unlock_irq(&priv->lock);
 825                 msleep(1);
 826                 ipoib_drain_cq(priv);
 827                 spin_lock_irq(&priv->lock);
 828         }
 829
 830         spin_unlock_irq(&priv->lock);
 831
 832         ipoib_cm_free_rx_reap_list(priv);
 833
 834         cancel_delayed_work(&priv->cm.stale_task);
 835 }
 836
 837 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 838 {
 839         struct ipoib_cm_tx *p = cm_id->context;
 840         struct ipoib_dev_priv *priv = p->priv;
 841         struct ipoib_cm_data *data = event->private_data;
 842         struct ifqueue mbqueue;
 843         struct ib_qp_attr qp_attr;
 844         int qp_attr_mask, ret;
 845         struct mbuf *mb;
 846
 847         ipoib_dbg(priv, "cm rep handler\n");
 848         p->mtu = be32_to_cpu(data->mtu);
 849
 850         if (p->mtu <= IPOIB_ENCAP_LEN) {
 851                 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
 852                            p->mtu, IPOIB_ENCAP_LEN);
 853                 return -EINVAL;
 854         }
 855
 856         qp_attr.qp_state = IB_QPS_RTR;
 857         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 858         if (ret) {
 859                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 860                 return ret;
 861         }
 862
 863         qp_attr.rq_psn = 0 /* FIXME */;
 864         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 865         if (ret) {
 866                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 867                 return ret;
 868         }
 869
 870         qp_attr.qp_state = IB_QPS_RTS;
 871         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 872         if (ret) {
 873                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 874                 return ret;
 875         }
 876         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 877         if (ret) {
 878                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 879                 return ret;
 880         }
 881
 882         bzero(&mbqueue, sizeof(mbqueue));
 883
 884         spin_lock_irq(&priv->lock);
 885         set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
 886         if (p->path)
 887                 for (;;) {
 888                         _IF_DEQUEUE(&p->path->queue, mb);
 889                         if (mb == NULL)
 890                                 break;
 891                         _IF_ENQUEUE(&mbqueue, mb);
 892                 }
 893         spin_unlock_irq(&priv->lock);
 894
 895         for (;;) {
 896                 struct ifnet *dev = p->priv->dev;
 897                 _IF_DEQUEUE(&mbqueue, mb);
 898                 if (mb == NULL)
 899                         break;
 900                 mb->m_pkthdr.rcvif = dev;
 901                 if (dev->if_transmit(dev, mb))
 902                         ipoib_warn(priv, "dev_queue_xmit failed "
 903                                    "to requeue packet\n");
 904         }
 905
 906         ret = ib_send_cm_rtu(cm_id, NULL, 0);
 907         if (ret) {
 908                 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
 909                 return ret;
 910         }
 911         return 0;
 912 }
 913
 914 static struct ib_qp *ipoib_cm_create_tx_qp(struct ipoib_dev_priv *priv,
 915     struct ipoib_cm_tx *tx)
 916 {
 917         struct ib_qp_init_attr attr = {
 918                 .send_cq                = priv->send_cq,
 919                 .recv_cq                = priv->recv_cq,
 920                 .srq                    = priv->cm.srq,
 921                 .cap.max_send_wr        = ipoib_sendq_size,
 922                 .cap.max_send_sge       = priv->cm.num_frags,
 923                 .sq_sig_type            = IB_SIGNAL_ALL_WR,
 924                 .qp_type                = IB_QPT_RC,
 925                 .qp_context             = tx
 926         };
 927
 928         return ib_create_qp(priv->pd, &attr);
 929 }
 930
 931 static int ipoib_cm_send_req(struct ipoib_dev_priv *priv,
 932                              struct ib_cm_id *id, struct ib_qp *qp,
 933                              u32 qpn,
 934                              struct ib_sa_path_rec *pathrec)
 935 {
 936         struct ipoib_cm_data data = {};
 937         struct ib_cm_req_param req = {};
 938
 939         ipoib_dbg(priv, "cm send req\n");
 940
 941         data.qpn = cpu_to_be32(priv->qp->qp_num);
 942         data.mtu = cpu_to_be32(priv->cm.max_cm_mtu);
 943
 944         req.primary_path                = pathrec;
 945         req.alternate_path              = NULL;
 946         req.service_id                  = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
 947         req.qp_num                      = qp->qp_num;
 948         req.qp_type                     = qp->qp_type;
 949         req.private_data                = &data;
 950         req.private_data_len            = sizeof data;
 951         req.flow_control                = 0;
 952
 953         req.starting_psn                = 0; /* FIXME */
 954
 955         /*
 956          * Pick some arbitrary defaults here; we could make these
 957          * module parameters if anyone cared about setting them.
 958          */
 959         req.responder_resources         = 4;
 960         req.remote_cm_response_timeout  = 20;
 961         req.local_cm_response_timeout   = 20;
 962         req.retry_count                 = 0; /* RFC draft warns against retries */
 963         req.rnr_retry_count             = 0; /* RFC draft warns against retries */
 964         req.max_cm_retries              = 15;
 965         req.srq                         = ipoib_cm_has_srq(priv);
 966         return ib_send_cm_req(id, &req);
 967 }
 968
 969 static int ipoib_cm_modify_tx_init(struct ipoib_dev_priv *priv,
 970                                   struct ib_cm_id *cm_id, struct ib_qp *qp)
 971 {
 972         struct ib_qp_attr qp_attr;
 973         int qp_attr_mask, ret;
 974         ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
 975         if (ret) {
 976                 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
 977                 return ret;
 978         }
 979
 980         qp_attr.qp_state = IB_QPS_INIT;
 981         qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
 982         qp_attr.port_num = priv->port;
 983         qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
 984
 985         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 986         if (ret) {
 987                 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
 988                 return ret;
 989         }
 990         return 0;
 991 }
 992
 993 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
 994                             struct ib_sa_path_rec *pathrec)
 995 {
 996         struct ipoib_dev_priv *priv = p->priv;
 997         int ret;
 998
 999         p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring, GFP_KERNEL);
1000         if (!p->tx_ring) {
1001                 ipoib_warn(priv, "failed to allocate tx ring\n");
1002                 ret = -ENOMEM;
1003                 goto err_tx;
1004         }
1005         memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1006
1007         p->qp = ipoib_cm_create_tx_qp(p->priv, p);
1008         if (IS_ERR(p->qp)) {
1009                 ret = PTR_ERR(p->qp);
1010                 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1011                 goto err_qp;
1012         }
1013
1014         p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1015         if (IS_ERR(p->id)) {
1016                 ret = PTR_ERR(p->id);
1017                 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1018                 goto err_id;
1019         }
1020
1021         ret = ipoib_cm_modify_tx_init(p->priv, p->id,  p->qp);
1022         if (ret) {
1023                 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1024                 goto err_modify;
1025         }
1026
1027         ret = ipoib_cm_send_req(p->priv, p->id, p->qp, qpn, pathrec);
1028         if (ret) {
1029                 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1030                 goto err_send_cm;
1031         }
1032
1033         ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1034                   p->qp->qp_num, pathrec->dgid.raw, qpn);
1035
1036         return 0;
1037
1038 err_send_cm:
1039 err_modify:
1040         ib_destroy_cm_id(p->id);
1041 err_id:
1042         p->id = NULL;
1043         ib_destroy_qp(p->qp);
1044 err_qp:
1045         p->qp = NULL;
1046         kfree(p->tx_ring);
1047 err_tx:
1048         return ret;
1049 }
1050
1051 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1052 {
1053         struct ipoib_dev_priv *priv = p->priv;
1054         struct ifnet *dev = priv->dev;
1055         struct ipoib_cm_tx_buf *tx_req;
1056         unsigned long begin;
1057
1058         ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1059                   p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1060
1061         if (p->path)
1062                 ipoib_path_free(priv, p->path);
1063
1064         if (p->id)
1065                 ib_destroy_cm_id(p->id);
1066
1067         if (p->tx_ring) {
1068                 /* Wait for all sends to complete */
1069                 begin = jiffies;
1070                 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1071                         if (time_after(jiffies, begin + 5 * HZ)) {
1072                                 ipoib_warn(priv, "timing out; %d sends not completed\n",
1073                                            p->tx_head - p->tx_tail);
1074                                 goto timeout;
1075                         }
1076
1077                         msleep(1);
1078                 }
1079         }
1080
1081 timeout:
1082
1083         while ((int) p->tx_tail - (int) p->tx_head < 0) {
1084                 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1085                 ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req);
1086                 m_freem(tx_req->mb);
1087                 ++p->tx_tail;
1088                 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1089                     (dev->if_drv_flags & IFF_DRV_OACTIVE) != 0 &&
1090                     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1091                         dev->if_drv_flags &= ~IFF_DRV_OACTIVE;
1092         }
1093
1094         if (p->qp)
1095                 ib_destroy_qp(p->qp);
1096
1097         kfree(p->tx_ring);
1098         kfree(p);
1099 }
1100
1101 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1102                                struct ib_cm_event *event)
1103 {
1104         struct ipoib_cm_tx *tx = cm_id->context;
1105         struct ipoib_dev_priv *priv = tx->priv;
1106         struct ipoib_path *path;
1107         unsigned long flags;
1108         int ret;
1109
1110         switch (event->event) {
1111         case IB_CM_DREQ_RECEIVED:
1112                 ipoib_dbg(priv, "DREQ received.\n");
1113                 ib_send_cm_drep(cm_id, NULL, 0);
1114                 break;
1115         case IB_CM_REP_RECEIVED:
1116                 ipoib_dbg(priv, "REP received.\n");
1117                 ret = ipoib_cm_rep_handler(cm_id, event);
1118                 if (ret)
1119                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1120                                        NULL, 0, NULL, 0);
1121                 break;
1122         case IB_CM_REQ_ERROR:
1123         case IB_CM_REJ_RECEIVED:
1124         case IB_CM_TIMEWAIT_EXIT:
1125                 ipoib_dbg(priv, "CM error %d.\n", event->event);
1126                 spin_lock_irqsave(&priv->lock, flags);
1127                 path = tx->path;
1128
1129                 if (path) {
1130                         path->cm = NULL;
1131                         tx->path = NULL;
1132                         rb_erase(&path->rb_node, &priv->path_tree);
1133                         list_del(&path->list);
1134                 }
1135
1136                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1137                         list_move(&tx->list, &priv->cm.reap_list);
1138                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
1139                 }
1140
1141                 spin_unlock_irqrestore(&priv->lock, flags);
1142                 if (path)
1143                         ipoib_path_free(tx->priv, path);
1144                 break;
1145         default:
1146                 break;
1147         }
1148
1149         return 0;
1150 }
1151
1152 struct ipoib_cm_tx *ipoib_cm_create_tx(struct ipoib_dev_priv *priv,
1153     struct ipoib_path *path)
1154 {
1155         struct ipoib_cm_tx *tx;
1156
1157         tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1158         if (!tx)
1159                 return NULL;
1160
1161         ipoib_dbg(priv, "Creating cm tx\n");
1162         path->cm = tx;
1163         tx->path = path;
1164         tx->priv = priv;
1165         list_add(&tx->list, &priv->cm.start_list);
1166         set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1167         queue_work(ipoib_workqueue, &priv->cm.start_task);
1168         return tx;
1169 }
1170
1171 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1172 {
1173         struct ipoib_dev_priv *priv = tx->priv;
1174         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1175                 spin_lock(&priv->lock);
1176                 list_move(&tx->list, &priv->cm.reap_list);
1177                 spin_unlock(&priv->lock);
1178                 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1179                 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1180                           tx->path->pathrec.dgid.raw);
1181                 tx->path = NULL;
1182         }
1183 }
1184
1185 static void ipoib_cm_tx_start(struct work_struct *work)
1186 {
1187         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1188                                                    cm.start_task);
1189         struct ipoib_path *path;
1190         struct ipoib_cm_tx *p;
1191         unsigned long flags;
1192         int ret;
1193
1194         struct ib_sa_path_rec pathrec;
1195         u32 qpn;
1196
1197         ipoib_dbg(priv, "cm start task\n");
1198         spin_lock_irqsave(&priv->lock, flags);
1199
1200         while (!list_empty(&priv->cm.start_list)) {
1201                 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1202                 list_del_init(&p->list);
1203                 path = p->path;
1204                 qpn = IPOIB_QPN(path->hwaddr);
1205                 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1206
1207                 spin_unlock_irqrestore(&priv->lock, flags);
1208
1209                 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1210
1211                 spin_lock_irqsave(&priv->lock, flags);
1212
1213                 if (ret) {
1214                         path = p->path;
1215                         if (path) {
1216                                 path->cm = NULL;
1217                                 rb_erase(&path->rb_node, &priv->path_tree);
1218                                 list_del(&path->list);
1219                                 ipoib_path_free(priv, path);
1220                         }
1221                         list_del(&p->list);
1222                         kfree(p);
1223                 }
1224         }
1225
1226         spin_unlock_irqrestore(&priv->lock, flags);
1227 }
1228
1229 static void ipoib_cm_tx_reap(struct work_struct *work)
1230 {
1231         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1232                                                    cm.reap_task);
1233         struct ipoib_cm_tx *p;
1234         unsigned long flags;
1235
1236         spin_lock_irqsave(&priv->lock, flags);
1237
1238         while (!list_empty(&priv->cm.reap_list)) {
1239                 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1240                 list_del(&p->list);
1241                 spin_unlock_irqrestore(&priv->lock, flags);
1242                 ipoib_cm_tx_destroy(p);
1243                 spin_lock_irqsave(&priv->lock, flags);
1244         }
1245
1246         spin_unlock_irqrestore(&priv->lock, flags);
1247 }
1248
1249 static void ipoib_cm_mb_reap(struct work_struct *work)
1250 {
1251         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1252                                                    cm.mb_task);
1253         struct mbuf *mb;
1254         unsigned long flags;
1255 #if defined(INET) || defined(INET6)
1256         unsigned mtu = priv->mcast_mtu;
1257 #endif
1258         uint16_t proto;
1259
1260         spin_lock_irqsave(&priv->lock, flags);
1261
1262         CURVNET_SET_QUIET(priv->dev->if_vnet);
1263
1264         for (;;) {
1265                 IF_DEQUEUE(&priv->cm.mb_queue, mb);
1266                 if (mb == NULL)
1267                         break;
1268                 spin_unlock_irqrestore(&priv->lock, flags);
1269
1270                 proto = htons(*mtod(mb, uint16_t *));
1271                 m_adj(mb, IPOIB_ENCAP_LEN);
1272                 switch (proto) {
1273 #if defined(INET)
1274                 case ETHERTYPE_IP:
1275                         icmp_error(mb, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, mtu);
1276                         break;
1277 #endif
1278 #if defined(INET6)
1279                 case ETHERTYPE_IPV6:
1280                         icmp6_error(mb, ICMP6_PACKET_TOO_BIG, 0, mtu);
1281                         break;
1282 #endif
1283                 default:
1284                         m_freem(mb);
1285                 }
1286
1287                 spin_lock_irqsave(&priv->lock, flags);
1288         }
1289
1290         CURVNET_RESTORE();
1291
1292         spin_unlock_irqrestore(&priv->lock, flags);
1293 }
1294
1295 void
1296 ipoib_cm_mb_too_long(struct ipoib_dev_priv *priv, struct mbuf *mb, unsigned int mtu)
1297 {
1298         int e = priv->cm.mb_queue.ifq_len;
1299
1300         IF_ENQUEUE(&priv->cm.mb_queue, mb);
1301         if (e == 0)
1302                 queue_work(ipoib_workqueue, &priv->cm.mb_task);
1303 }
1304
1305 static void ipoib_cm_rx_reap(struct work_struct *work)
1306 {
1307         ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1308                                                 cm.rx_reap_task));
1309 }
1310
1311 static void ipoib_cm_stale_task(struct work_struct *work)
1312 {
1313         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1314                                                    cm.stale_task.work);
1315         struct ipoib_cm_rx *p;
1316         int ret;
1317
1318         spin_lock_irq(&priv->lock);
1319         while (!list_empty(&priv->cm.passive_ids)) {
1320                 /* List is sorted by LRU, start from tail,
1321                  * stop when we see a recently used entry */
1322                 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1323                 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1324                         break;
1325                 list_move(&p->list, &priv->cm.rx_error_list);
1326                 p->state = IPOIB_CM_RX_ERROR;
1327                 spin_unlock_irq(&priv->lock);
1328                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1329                 if (ret)
1330                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1331                 spin_lock_irq(&priv->lock);
1332         }
1333
1334         if (!list_empty(&priv->cm.passive_ids))
1335                 queue_delayed_work(ipoib_workqueue,
1336                                    &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1337         spin_unlock_irq(&priv->lock);
1338 }
1339
1340
1341 static void ipoib_cm_create_srq(struct ipoib_dev_priv *priv, int max_sge)
1342 {
1343         struct ib_srq_init_attr srq_init_attr = {
1344                 .attr = {
1345                         .max_wr  = ipoib_recvq_size,
1346                         .max_sge = max_sge
1347                 }
1348         };
1349
1350         priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1351         if (IS_ERR(priv->cm.srq)) {
1352                 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1353                         printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1354                                priv->ca->name, PTR_ERR(priv->cm.srq));
1355                 priv->cm.srq = NULL;
1356                 return;
1357         }
1358
1359         priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring, GFP_KERNEL);
1360         if (!priv->cm.srq_ring) {
1361                 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n",
1362                        priv->ca->name, ipoib_recvq_size);
1363                 ib_destroy_srq(priv->cm.srq);
1364                 priv->cm.srq = NULL;
1365                 return;
1366         }
1367
1368         memset(priv->cm.srq_ring, 0, ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1369 }
1370
1371 int ipoib_cm_dev_init(struct ipoib_dev_priv *priv)
1372 {
1373         struct ifnet *dev = priv->dev;
1374         int i, ret;
1375         struct ib_device_attr attr;
1376
1377         INIT_LIST_HEAD(&priv->cm.passive_ids);
1378         INIT_LIST_HEAD(&priv->cm.reap_list);
1379         INIT_LIST_HEAD(&priv->cm.start_list);
1380         INIT_LIST_HEAD(&priv->cm.rx_error_list);
1381         INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1382         INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1383         INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1384         INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1385         INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1386         INIT_WORK(&priv->cm.mb_task, ipoib_cm_mb_reap);
1387         INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1388         INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1389
1390         bzero(&priv->cm.mb_queue, sizeof(priv->cm.mb_queue));
1391         mtx_init(&priv->cm.mb_queue.ifq_mtx,
1392             dev->if_xname, "if send queue", MTX_DEF);
1393
1394         ret = ib_query_device(priv->ca, &attr);
1395         if (ret) {
1396                 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret);
1397                 return ret;
1398         }
1399
1400         ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge);
1401
1402         attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge);
1403         ipoib_cm_create_srq(priv, attr.max_srq_sge);
1404         if (ipoib_cm_has_srq(priv)) {
1405                 priv->cm.max_cm_mtu = attr.max_srq_sge * MJUMPAGESIZE;
1406                 priv->cm.num_frags  = attr.max_srq_sge;
1407                 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1408                           priv->cm.max_cm_mtu, priv->cm.num_frags);
1409         } else {
1410                 priv->cm.max_cm_mtu = IPOIB_CM_MAX_MTU;
1411                 priv->cm.num_frags  = IPOIB_CM_RX_SG;
1412         }
1413
1414         ipoib_cm_init_rx_wr(priv, &priv->cm.rx_wr, priv->cm.rx_sge);
1415
1416         if (ipoib_cm_has_srq(priv)) {
1417                 for (i = 0; i < ipoib_recvq_size; ++i) {
1418                         if (!ipoib_cm_alloc_rx_mb(priv, &priv->cm.srq_ring[i])) {
1419                                 ipoib_warn(priv, "failed to allocate "
1420                                            "receive buffer %d\n", i);
1421                                 ipoib_cm_dev_cleanup(priv);
1422                                 return -ENOMEM;
1423                         }
1424
1425                         if (ipoib_cm_post_receive_srq(priv, i)) {
1426                                 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1427                                            "failed for buf %d\n", i);
1428                                 ipoib_cm_dev_cleanup(priv);
1429                                 return -EIO;
1430                         }
1431                 }
1432         }
1433
1434         IF_LLADDR(priv->dev)[0] = IPOIB_FLAGS_RC;
1435         return 0;
1436 }
1437
1438 void ipoib_cm_dev_cleanup(struct ipoib_dev_priv *priv)
1439 {
1440         int ret;
1441
1442         if (!priv->cm.srq)
1443                 return;
1444
1445         ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1446
1447         ret = ib_destroy_srq(priv->cm.srq);
1448         if (ret)
1449                 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1450
1451         priv->cm.srq = NULL;
1452         if (!priv->cm.srq_ring)
1453                 return;
1454
1455         ipoib_cm_free_rx_ring(priv, priv->cm.srq_ring);
1456         priv->cm.srq_ring = NULL;
1457
1458         mtx_destroy(&priv->cm.mb_queue.ifq_mtx);
1459 }
1460
1461 #endif /* CONFIG_INFINIBAND_IPOIB_CM */