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  * $Id$
  33  */
  34
  35 #include <rdma/ib_cm.h>
  36 #include <rdma/ib_cache.h>
  37 #include <net/dst.h>
  38 #include <net/icmp.h>
  39 #include <linux/icmpv6.h>
  40 #include <linux/delay.h>
  41
  42 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  43 static int data_debug_level;
  44
  45 module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
  46 MODULE_PARM_DESC(cm_data_debug_level,
  47                  "Enable data path debug tracing for connected mode if > 0");
  48 #endif
  49
  50 #include "ipoib.h"
  51
  52 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
  53
  54 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
  55 #define IPOIB_CM_RX_TIMEOUT     (2 * 256 * HZ)
  56 #define IPOIB_CM_RX_DELAY       (3 * 256 * HZ)
  57 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
  58
  59 static struct ib_qp_attr ipoib_cm_err_attr = {
  60         .qp_state = IB_QPS_ERR
  61 };
  62
  63 #define IPOIB_CM_RX_DRAIN_WRID 0x7fffffff
  64
  65 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
  66         .wr_id = IPOIB_CM_RX_DRAIN_WRID,
  67         .opcode = IB_WR_SEND,
  68 };
  69
  70 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
  71                                struct ib_cm_event *event);
  72
  73 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
  74                                   u64 mapping[IPOIB_CM_RX_SG])
  75 {
  76         int i;
  77
  78         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
  79
  80         for (i = 0; i < frags; ++i)
  81                 ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
  82 }
  83
  84 static int ipoib_cm_post_receive(struct net_device *dev, int id)
  85 {
  86         struct ipoib_dev_priv *priv = netdev_priv(dev);
  87         struct ib_recv_wr *bad_wr;
  88         int i, ret;
  89
  90         priv->cm.rx_wr.wr_id = id | IPOIB_CM_OP_SRQ;
  91
  92         for (i = 0; i < IPOIB_CM_RX_SG; ++i)
  93                 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
  94
  95         ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
  96         if (unlikely(ret)) {
  97                 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
  98                 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
  99                                       priv->cm.srq_ring[id].mapping);
 100                 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
 101                 priv->cm.srq_ring[id].skb = NULL;
 102         }
 103
 104         return ret;
 105 }
 106
 107 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, int id, int frags,
 108                                              u64 mapping[IPOIB_CM_RX_SG])
 109 {
 110         struct ipoib_dev_priv *priv = netdev_priv(dev);
 111         struct sk_buff *skb;
 112         int i;
 113
 114         skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
 115         if (unlikely(!skb))
 116                 return NULL;
 117
 118         /*
 119          * IPoIB adds a 4 byte header. So we need 12 more bytes to align the
 120          * IP header to a multiple of 16.
 121          */
 122         skb_reserve(skb, 12);
 123
 124         mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
 125                                        DMA_FROM_DEVICE);
 126         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
 127                 dev_kfree_skb_any(skb);
 128                 return NULL;
 129         }
 130
 131         for (i = 0; i < frags; i++) {
 132                 struct page *page = alloc_page(GFP_ATOMIC);
 133
 134                 if (!page)
 135                         goto partial_error;
 136                 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
 137
 138                 mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page,
 139                                                  0, PAGE_SIZE, DMA_FROM_DEVICE);
 140                 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
 141                         goto partial_error;
 142         }
 143
 144         priv->cm.srq_ring[id].skb = skb;
 145         return skb;
 146
 147 partial_error:
 148
 149         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
 150
 151         for (; i >= 0; --i)
 152                 ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
 153
 154         dev_kfree_skb_any(skb);
 155         return NULL;
 156 }
 157
 158 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv* priv)
 159 {
 160         struct ib_send_wr *bad_wr;
 161         struct ipoib_cm_rx *p;
 162
 163         /* We only reserved 1 extra slot in CQ for drain WRs, so
 164          * make sure we have at most 1 outstanding WR. */
 165         if (list_empty(&priv->cm.rx_flush_list) ||
 166             !list_empty(&priv->cm.rx_drain_list))
 167                 return;
 168
 169         /*
 170          * QPs on flush list are error state.  This way, a "flush
 171          * error" WC will be immediately generated for each WR we post.
 172          */
 173         p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
 174         if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
 175                 ipoib_warn(priv, "failed to post drain wr\n");
 176
 177         list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
 178 }
 179
 180 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
 181 {
 182         struct ipoib_cm_rx *p = ctx;
 183         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 184         unsigned long flags;
 185
 186         if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
 187                 return;
 188
 189         spin_lock_irqsave(&priv->lock, flags);
 190         list_move(&p->list, &priv->cm.rx_flush_list);
 191         p->state = IPOIB_CM_RX_FLUSH;
 192         ipoib_cm_start_rx_drain(priv);
 193         spin_unlock_irqrestore(&priv->lock, flags);
 194 }
 195
 196 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
 197                                            struct ipoib_cm_rx *p)
 198 {
 199         struct ipoib_dev_priv *priv = netdev_priv(dev);
 200         struct ib_qp_init_attr attr = {
 201                 .event_handler = ipoib_cm_rx_event_handler,
 202                 .send_cq = priv->cq, /* For drain WR */
 203                 .recv_cq = priv->cq,
 204                 .srq = priv->cm.srq,
 205                 .cap.max_send_wr = 1, /* For drain WR */
 206                 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
 207                 .sq_sig_type = IB_SIGNAL_ALL_WR,
 208                 .qp_type = IB_QPT_RC,
 209                 .qp_context = p,
 210         };
 211         return ib_create_qp(priv->pd, &attr);
 212 }
 213
 214 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
 215                                   struct ib_cm_id *cm_id, struct ib_qp *qp,
 216                                   unsigned psn)
 217 {
 218         struct ipoib_dev_priv *priv = netdev_priv(dev);
 219         struct ib_qp_attr qp_attr;
 220         int qp_attr_mask, ret;
 221
 222         qp_attr.qp_state = IB_QPS_INIT;
 223         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 224         if (ret) {
 225                 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
 226                 return ret;
 227         }
 228         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 229         if (ret) {
 230                 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
 231                 return ret;
 232         }
 233         qp_attr.qp_state = IB_QPS_RTR;
 234         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 235         if (ret) {
 236                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 237                 return ret;
 238         }
 239         qp_attr.rq_psn = psn;
 240         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 241         if (ret) {
 242                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 243                 return ret;
 244         }
 245
 246         /*
 247          * Current Mellanox HCA firmware won't generate completions
 248          * with error for drain WRs unless the QP has been moved to
 249          * RTS first. This work-around leaves a window where a QP has
 250          * moved to error asynchronously, but this will eventually get
 251          * fixed in firmware, so let's not error out if modify QP
 252          * fails.
 253          */
 254         qp_attr.qp_state = IB_QPS_RTS;
 255         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 256         if (ret) {
 257                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 258                 return 0;
 259         }
 260         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 261         if (ret) {
 262                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 263                 return 0;
 264         }
 265
 266         return 0;
 267 }
 268
 269 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
 270                              struct ib_qp *qp, struct ib_cm_req_event_param *req,
 271                              unsigned psn)
 272 {
 273         struct ipoib_dev_priv *priv = netdev_priv(dev);
 274         struct ipoib_cm_data data = {};
 275         struct ib_cm_rep_param rep = {};
 276
 277         data.qpn = cpu_to_be32(priv->qp->qp_num);
 278         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
 279
 280         rep.private_data = &data;
 281         rep.private_data_len = sizeof data;
 282         rep.flow_control = 0;
 283         rep.rnr_retry_count = req->rnr_retry_count;
 284         rep.target_ack_delay = 20; /* FIXME */
 285         rep.srq = 1;
 286         rep.qp_num = qp->qp_num;
 287         rep.starting_psn = psn;
 288         return ib_send_cm_rep(cm_id, &rep);
 289 }
 290
 291 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 292 {
 293         struct net_device *dev = cm_id->context;
 294         struct ipoib_dev_priv *priv = netdev_priv(dev);
 295         struct ipoib_cm_rx *p;
 296         unsigned psn;
 297         int ret;
 298
 299         ipoib_dbg(priv, "REQ arrived\n");
 300         p = kzalloc(sizeof *p, GFP_KERNEL);
 301         if (!p)
 302                 return -ENOMEM;
 303         p->dev = dev;
 304         p->id = cm_id;
 305         cm_id->context = p;
 306         p->state = IPOIB_CM_RX_LIVE;
 307         p->jiffies = jiffies;
 308         INIT_LIST_HEAD(&p->list);
 309
 310         p->qp = ipoib_cm_create_rx_qp(dev, p);
 311         if (IS_ERR(p->qp)) {
 312                 ret = PTR_ERR(p->qp);
 313                 goto err_qp;
 314         }
 315
 316         psn = random32() & 0xffffff;
 317         ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
 318         if (ret)
 319                 goto err_modify;
 320
 321         spin_lock_irq(&priv->lock);
 322         queue_delayed_work(ipoib_workqueue,
 323                            &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
 324         /* Add this entry to passive ids list head, but do not re-add it
 325          * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
 326         p->jiffies = jiffies;
 327         if (p->state == IPOIB_CM_RX_LIVE)
 328                 list_move(&p->list, &priv->cm.passive_ids);
 329         spin_unlock_irq(&priv->lock);
 330
 331         ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
 332         if (ret) {
 333                 ipoib_warn(priv, "failed to send REP: %d\n", ret);
 334                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 335                         ipoib_warn(priv, "unable to move qp to error state\n");
 336         }
 337         return 0;
 338
 339 err_modify:
 340         ib_destroy_qp(p->qp);
 341 err_qp:
 342         kfree(p);
 343         return ret;
 344 }
 345
 346 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
 347                                struct ib_cm_event *event)
 348 {
 349         struct ipoib_cm_rx *p;
 350         struct ipoib_dev_priv *priv;
 351
 352         switch (event->event) {
 353         case IB_CM_REQ_RECEIVED:
 354                 return ipoib_cm_req_handler(cm_id, event);
 355         case IB_CM_DREQ_RECEIVED:
 356                 p = cm_id->context;
 357                 ib_send_cm_drep(cm_id, NULL, 0);
 358                 /* Fall through */
 359         case IB_CM_REJ_RECEIVED:
 360                 p = cm_id->context;
 361                 priv = netdev_priv(p->dev);
 362                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 363                         ipoib_warn(priv, "unable to move qp to error state\n");
 364                 /* Fall through */
 365         default:
 366                 return 0;
 367         }
 368 }
 369 /* Adjust length of skb with fragments to match received data */
 370 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
 371                           unsigned int length, struct sk_buff *toskb)
 372 {
 373         int i, num_frags;
 374         unsigned int size;
 375
 376         /* put header into skb */
 377         size = min(length, hdr_space);
 378         skb->tail += size;
 379         skb->len += size;
 380         length -= size;
 381
 382         num_frags = skb_shinfo(skb)->nr_frags;
 383         for (i = 0; i < num_frags; i++) {
 384                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 385
 386                 if (length == 0) {
 387                         /* don't need this page */
 388                         skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE);
 389                         --skb_shinfo(skb)->nr_frags;
 390                 } else {
 391                         size = min(length, (unsigned) PAGE_SIZE);
 392
 393                         frag->size = size;
 394                         skb->data_len += size;
 395                         skb->truesize += size;
 396                         skb->len += size;
 397                         length -= size;
 398                 }
 399         }
 400 }
 401
 402 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 403 {
 404         struct ipoib_dev_priv *priv = netdev_priv(dev);
 405         unsigned int wr_id = wc->wr_id & ~IPOIB_CM_OP_SRQ;
 406         struct sk_buff *skb, *newskb;
 407         struct ipoib_cm_rx *p;
 408         unsigned long flags;
 409         u64 mapping[IPOIB_CM_RX_SG];
 410         int frags;
 411
 412         ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
 413                        wr_id, wc->status);
 414
 415         if (unlikely(wr_id >= ipoib_recvq_size)) {
 416                 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~IPOIB_CM_OP_SRQ)) {
 417                         spin_lock_irqsave(&priv->lock, flags);
 418                         list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
 419                         ipoib_cm_start_rx_drain(priv);
 420                         queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
 421                         spin_unlock_irqrestore(&priv->lock, flags);
 422                 } else
 423                         ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
 424                                    wr_id, ipoib_recvq_size);
 425                 return;
 426         }
 427
 428         skb  = priv->cm.srq_ring[wr_id].skb;
 429
 430         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 431                 ipoib_dbg(priv, "cm recv error "
 432                            "(status=%d, wrid=%d vend_err %x)\n",
 433                            wc->status, wr_id, wc->vendor_err);
 434                 ++priv->stats.rx_dropped;
 435                 goto repost;
 436         }
 437
 438         if (!likely(wr_id & IPOIB_CM_RX_UPDATE_MASK)) {
 439                 p = wc->qp->qp_context;
 440                 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
 441                         spin_lock_irqsave(&priv->lock, flags);
 442                         p->jiffies = jiffies;
 443                         /* Move this entry to list head, but do not re-add it
 444                          * if it has been moved out of list. */
 445                         if (p->state == IPOIB_CM_RX_LIVE)
 446                                 list_move(&p->list, &priv->cm.passive_ids);
 447                         spin_unlock_irqrestore(&priv->lock, flags);
 448                 }
 449         }
 450
 451         frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
 452                                               (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
 453
 454         newskb = ipoib_cm_alloc_rx_skb(dev, wr_id, frags, mapping);
 455         if (unlikely(!newskb)) {
 456                 /*
 457                  * If we can't allocate a new RX buffer, dump
 458                  * this packet and reuse the old buffer.
 459                  */
 460                 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
 461                 ++priv->stats.rx_dropped;
 462                 goto repost;
 463         }
 464
 465         ipoib_cm_dma_unmap_rx(priv, frags, priv->cm.srq_ring[wr_id].mapping);
 466         memcpy(priv->cm.srq_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
 467
 468         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 469                        wc->byte_len, wc->slid);
 470
 471         skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
 472
 473         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 474         skb_reset_mac_header(skb);
 475         skb_pull(skb, IPOIB_ENCAP_LEN);
 476
 477         dev->last_rx = jiffies;
 478         ++priv->stats.rx_packets;
 479         priv->stats.rx_bytes += skb->len;
 480
 481         skb->dev = dev;
 482         /* XXX get correct PACKET_ type here */
 483         skb->pkt_type = PACKET_HOST;
 484         netif_receive_skb(skb);
 485
 486 repost:
 487         if (unlikely(ipoib_cm_post_receive(dev, wr_id)))
 488                 ipoib_warn(priv, "ipoib_cm_post_receive failed "
 489                            "for buf %d\n", wr_id);
 490 }
 491
 492 static inline int post_send(struct ipoib_dev_priv *priv,
 493                             struct ipoib_cm_tx *tx,
 494                             unsigned int wr_id,
 495                             u64 addr, int len)
 496 {
 497         struct ib_send_wr *bad_wr;
 498
 499         priv->tx_sge.addr             = addr;
 500         priv->tx_sge.length           = len;
 501
 502         priv->tx_wr.wr_id             = wr_id;
 503
 504         return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
 505 }
 506
 507 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
 508 {
 509         struct ipoib_dev_priv *priv = netdev_priv(dev);
 510         struct ipoib_tx_buf *tx_req;
 511         u64 addr;
 512
 513         if (unlikely(skb->len > tx->mtu)) {
 514                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 515                            skb->len, tx->mtu);
 516                 ++priv->stats.tx_dropped;
 517                 ++priv->stats.tx_errors;
 518                 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
 519                 return;
 520         }
 521
 522         ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
 523                        tx->tx_head, skb->len, tx->qp->qp_num);
 524
 525         /*
 526          * We put the skb into the tx_ring _before_ we call post_send()
 527          * because it's entirely possible that the completion handler will
 528          * run before we execute anything after the post_send().  That
 529          * means we have to make sure everything is properly recorded and
 530          * our state is consistent before we call post_send().
 531          */
 532         tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
 533         tx_req->skb = skb;
 534         addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
 535         if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
 536                 ++priv->stats.tx_errors;
 537                 dev_kfree_skb_any(skb);
 538                 return;
 539         }
 540
 541         tx_req->mapping = addr;
 542
 543         if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
 544                                 addr, skb->len))) {
 545                 ipoib_warn(priv, "post_send failed\n");
 546                 ++priv->stats.tx_errors;
 547                 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
 548                 dev_kfree_skb_any(skb);
 549         } else {
 550                 dev->trans_start = jiffies;
 551                 ++tx->tx_head;
 552
 553                 if (tx->tx_head - tx->tx_tail == ipoib_sendq_size) {
 554                         ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
 555                                   tx->qp->qp_num);
 556                         netif_stop_queue(dev);
 557                         set_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags);
 558                 }
 559         }
 560 }
 561
 562 static void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ipoib_cm_tx *tx,
 563                                   struct ib_wc *wc)
 564 {
 565         struct ipoib_dev_priv *priv = netdev_priv(dev);
 566         unsigned int wr_id = wc->wr_id;
 567         struct ipoib_tx_buf *tx_req;
 568         unsigned long flags;
 569
 570         ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
 571                        wr_id, wc->status);
 572
 573         if (unlikely(wr_id >= ipoib_sendq_size)) {
 574                 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
 575                            wr_id, ipoib_sendq_size);
 576                 return;
 577         }
 578
 579         tx_req = &tx->tx_ring[wr_id];
 580
 581         ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
 582
 583         /* FIXME: is this right? Shouldn't we only increment on success? */
 584         ++priv->stats.tx_packets;
 585         priv->stats.tx_bytes += tx_req->skb->len;
 586
 587         dev_kfree_skb_any(tx_req->skb);
 588
 589         spin_lock_irqsave(&priv->tx_lock, flags);
 590         ++tx->tx_tail;
 591         if (unlikely(test_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags)) &&
 592             tx->tx_head - tx->tx_tail <= ipoib_sendq_size >> 1) {
 593                 clear_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags);
 594                 netif_wake_queue(dev);
 595         }
 596
 597         if (wc->status != IB_WC_SUCCESS &&
 598             wc->status != IB_WC_WR_FLUSH_ERR) {
 599                 struct ipoib_neigh *neigh;
 600
 601                 ipoib_dbg(priv, "failed cm send event "
 602                            "(status=%d, wrid=%d vend_err %x)\n",
 603                            wc->status, wr_id, wc->vendor_err);
 604
 605                 spin_lock(&priv->lock);
 606                 neigh = tx->neigh;
 607
 608                 if (neigh) {
 609                         neigh->cm = NULL;
 610                         list_del(&neigh->list);
 611                         if (neigh->ah)
 612                                 ipoib_put_ah(neigh->ah);
 613                         ipoib_neigh_free(dev, neigh);
 614
 615                         tx->neigh = NULL;
 616                 }
 617
 618                 /* queue would be re-started anyway when TX is destroyed,
 619                  * but it makes sense to do it ASAP here. */
 620                 if (test_and_clear_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags))
 621                         netif_wake_queue(dev);
 622
 623                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 624                         list_move(&tx->list, &priv->cm.reap_list);
 625                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
 626                 }
 627
 628                 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
 629
 630                 spin_unlock(&priv->lock);
 631         }
 632
 633         spin_unlock_irqrestore(&priv->tx_lock, flags);
 634 }
 635
 636 static void ipoib_cm_tx_completion(struct ib_cq *cq, void *tx_ptr)
 637 {
 638         struct ipoib_cm_tx *tx = tx_ptr;
 639         int n, i;
 640
 641         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 642         do {
 643                 n = ib_poll_cq(cq, IPOIB_NUM_WC, tx->ibwc);
 644                 for (i = 0; i < n; ++i)
 645                         ipoib_cm_handle_tx_wc(tx->dev, tx, tx->ibwc + i);
 646         } while (n == IPOIB_NUM_WC);
 647 }
 648
 649 int ipoib_cm_dev_open(struct net_device *dev)
 650 {
 651         struct ipoib_dev_priv *priv = netdev_priv(dev);
 652         int ret;
 653
 654         if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
 655                 return 0;
 656
 657         priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
 658         if (IS_ERR(priv->cm.id)) {
 659                 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
 660                 ret = PTR_ERR(priv->cm.id);
 661                 goto err_cm;
 662         }
 663
 664         ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
 665                            0, NULL);
 666         if (ret) {
 667                 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
 668                        IPOIB_CM_IETF_ID | priv->qp->qp_num);
 669                 goto err_listen;
 670         }
 671
 672         return 0;
 673
 674 err_listen:
 675         ib_destroy_cm_id(priv->cm.id);
 676 err_cm:
 677         priv->cm.id = NULL;
 678         return ret;
 679 }
 680
 681 void ipoib_cm_dev_stop(struct net_device *dev)
 682 {
 683         struct ipoib_dev_priv *priv = netdev_priv(dev);
 684         struct ipoib_cm_rx *p, *n;
 685         unsigned long begin;
 686         LIST_HEAD(list);
 687         int ret;
 688
 689         if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
 690                 return;
 691
 692         ib_destroy_cm_id(priv->cm.id);
 693         priv->cm.id = NULL;
 694
 695         spin_lock_irq(&priv->lock);
 696         while (!list_empty(&priv->cm.passive_ids)) {
 697                 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
 698                 list_move(&p->list, &priv->cm.rx_error_list);
 699                 p->state = IPOIB_CM_RX_ERROR;
 700                 spin_unlock_irq(&priv->lock);
 701                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
 702                 if (ret)
 703                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
 704                 spin_lock_irq(&priv->lock);
 705         }
 706
 707         /* Wait for all RX to be drained */
 708         begin = jiffies;
 709
 710         while (!list_empty(&priv->cm.rx_error_list) ||
 711                !list_empty(&priv->cm.rx_flush_list) ||
 712                !list_empty(&priv->cm.rx_drain_list)) {
 713                 if (time_after(jiffies, begin + 5 * HZ)) {
 714                         ipoib_warn(priv, "RX drain timing out\n");
 715
 716                         /*
 717                          * assume the HW is wedged and just free up everything.
 718                          */
 719                         list_splice_init(&priv->cm.rx_flush_list, &list);
 720                         list_splice_init(&priv->cm.rx_error_list, &list);
 721                         list_splice_init(&priv->cm.rx_drain_list, &list);
 722                         break;
 723                 }
 724                 spin_unlock_irq(&priv->lock);
 725                 msleep(1);
 726                 ipoib_drain_cq(dev);
 727                 spin_lock_irq(&priv->lock);
 728         }
 729
 730         list_splice_init(&priv->cm.rx_reap_list, &list);
 731
 732         spin_unlock_irq(&priv->lock);
 733
 734         list_for_each_entry_safe(p, n, &list, list) {
 735                 ib_destroy_cm_id(p->id);
 736                 ib_destroy_qp(p->qp);
 737                 kfree(p);
 738         }
 739
 740         cancel_delayed_work(&priv->cm.stale_task);
 741 }
 742
 743 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 744 {
 745         struct ipoib_cm_tx *p = cm_id->context;
 746         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 747         struct ipoib_cm_data *data = event->private_data;
 748         struct sk_buff_head skqueue;
 749         struct ib_qp_attr qp_attr;
 750         int qp_attr_mask, ret;
 751         struct sk_buff *skb;
 752
 753         p->mtu = be32_to_cpu(data->mtu);
 754
 755         if (p->mtu <= IPOIB_ENCAP_LEN) {
 756                 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
 757                            p->mtu, IPOIB_ENCAP_LEN);
 758                 return -EINVAL;
 759         }
 760
 761         qp_attr.qp_state = IB_QPS_RTR;
 762         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 763         if (ret) {
 764                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 765                 return ret;
 766         }
 767
 768         qp_attr.rq_psn = 0 /* FIXME */;
 769         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 770         if (ret) {
 771                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 772                 return ret;
 773         }
 774
 775         qp_attr.qp_state = IB_QPS_RTS;
 776         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 777         if (ret) {
 778                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 779                 return ret;
 780         }
 781         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 782         if (ret) {
 783                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 784                 return ret;
 785         }
 786
 787         skb_queue_head_init(&skqueue);
 788
 789         spin_lock_irq(&priv->lock);
 790         set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
 791         if (p->neigh)
 792                 while ((skb = __skb_dequeue(&p->neigh->queue)))
 793                         __skb_queue_tail(&skqueue, skb);
 794         spin_unlock_irq(&priv->lock);
 795
 796         while ((skb = __skb_dequeue(&skqueue))) {
 797                 skb->dev = p->dev;
 798                 if (dev_queue_xmit(skb))
 799                         ipoib_warn(priv, "dev_queue_xmit failed "
 800                                    "to requeue packet\n");
 801         }
 802
 803         ret = ib_send_cm_rtu(cm_id, NULL, 0);
 804         if (ret) {
 805                 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
 806                 return ret;
 807         }
 808         return 0;
 809 }
 810
 811 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ib_cq *cq)
 812 {
 813         struct ipoib_dev_priv *priv = netdev_priv(dev);
 814         struct ib_qp_init_attr attr = {};
 815         attr.recv_cq = priv->cq;
 816         attr.srq = priv->cm.srq;
 817         attr.cap.max_send_wr = ipoib_sendq_size;
 818         attr.cap.max_send_sge = 1;
 819         attr.sq_sig_type = IB_SIGNAL_ALL_WR;
 820         attr.qp_type = IB_QPT_RC;
 821         attr.send_cq = cq;
 822         return ib_create_qp(priv->pd, &attr);
 823 }
 824
 825 static int ipoib_cm_send_req(struct net_device *dev,
 826                              struct ib_cm_id *id, struct ib_qp *qp,
 827                              u32 qpn,
 828                              struct ib_sa_path_rec *pathrec)
 829 {
 830         struct ipoib_dev_priv *priv = netdev_priv(dev);
 831         struct ipoib_cm_data data = {};
 832         struct ib_cm_req_param req = {};
 833
 834         data.qpn = cpu_to_be32(priv->qp->qp_num);
 835         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
 836
 837         req.primary_path              = pathrec;
 838         req.alternate_path            = NULL;
 839         req.service_id                = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
 840         req.qp_num                    = qp->qp_num;
 841         req.qp_type                   = qp->qp_type;
 842         req.private_data              = &data;
 843         req.private_data_len          = sizeof data;
 844         req.flow_control              = 0;
 845
 846         req.starting_psn              = 0; /* FIXME */
 847
 848         /*
 849          * Pick some arbitrary defaults here; we could make these
 850          * module parameters if anyone cared about setting them.
 851          */
 852         req.responder_resources       = 4;
 853         req.remote_cm_response_timeout = 20;
 854         req.local_cm_response_timeout  = 20;
 855         req.retry_count               = 0; /* RFC draft warns against retries */
 856         req.rnr_retry_count           = 0; /* RFC draft warns against retries */
 857         req.max_cm_retries            = 15;
 858         req.srq                       = 1;
 859         return ib_send_cm_req(id, &req);
 860 }
 861
 862 static int ipoib_cm_modify_tx_init(struct net_device *dev,
 863                                   struct ib_cm_id *cm_id, struct ib_qp *qp)
 864 {
 865         struct ipoib_dev_priv *priv = netdev_priv(dev);
 866         struct ib_qp_attr qp_attr;
 867         int qp_attr_mask, ret;
 868         ret = ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
 869         if (ret) {
 870                 ipoib_warn(priv, "pkey 0x%x not in cache: %d\n", priv->pkey, ret);
 871                 return ret;
 872         }
 873
 874         qp_attr.qp_state = IB_QPS_INIT;
 875         qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
 876         qp_attr.port_num = priv->port;
 877         qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
 878
 879         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 880         if (ret) {
 881                 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
 882                 return ret;
 883         }
 884         return 0;
 885 }
 886
 887 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
 888                             struct ib_sa_path_rec *pathrec)
 889 {
 890         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 891         int ret;
 892
 893         p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring,
 894                                 GFP_KERNEL);
 895         if (!p->tx_ring) {
 896                 ipoib_warn(priv, "failed to allocate tx ring\n");
 897                 ret = -ENOMEM;
 898                 goto err_tx;
 899         }
 900
 901         p->cq = ib_create_cq(priv->ca, ipoib_cm_tx_completion, NULL, p,
 902                              ipoib_sendq_size + 1, 0);
 903         if (IS_ERR(p->cq)) {
 904                 ret = PTR_ERR(p->cq);
 905                 ipoib_warn(priv, "failed to allocate tx cq: %d\n", ret);
 906                 goto err_cq;
 907         }
 908
 909         ret = ib_req_notify_cq(p->cq, IB_CQ_NEXT_COMP);
 910         if (ret) {
 911                 ipoib_warn(priv, "failed to request completion notification: %d\n", ret);
 912                 goto err_req_notify;
 913         }
 914
 915         p->qp = ipoib_cm_create_tx_qp(p->dev, p->cq);
 916         if (IS_ERR(p->qp)) {
 917                 ret = PTR_ERR(p->qp);
 918                 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
 919                 goto err_qp;
 920         }
 921
 922         p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
 923         if (IS_ERR(p->id)) {
 924                 ret = PTR_ERR(p->id);
 925                 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
 926                 goto err_id;
 927         }
 928
 929         ret = ipoib_cm_modify_tx_init(p->dev, p->id,  p->qp);
 930         if (ret) {
 931                 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
 932                 goto err_modify;
 933         }
 934
 935         ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
 936         if (ret) {
 937                 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
 938                 goto err_send_cm;
 939         }
 940
 941         ipoib_dbg(priv, "Request connection 0x%x for gid " IPOIB_GID_FMT " qpn 0x%x\n",
 942                   p->qp->qp_num, IPOIB_GID_ARG(pathrec->dgid), qpn);
 943
 944         return 0;
 945
 946 err_send_cm:
 947 err_modify:
 948         ib_destroy_cm_id(p->id);
 949 err_id:
 950         p->id = NULL;
 951         ib_destroy_qp(p->qp);
 952 err_req_notify:
 953 err_qp:
 954         p->qp = NULL;
 955         ib_destroy_cq(p->cq);
 956 err_cq:
 957         p->cq = NULL;
 958 err_tx:
 959         return ret;
 960 }
 961
 962 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
 963 {
 964         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 965         struct ipoib_tx_buf *tx_req;
 966
 967         ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
 968                   p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
 969
 970         if (p->id)
 971                 ib_destroy_cm_id(p->id);
 972
 973         if (p->qp)
 974                 ib_destroy_qp(p->qp);
 975
 976         if (p->cq)
 977                 ib_destroy_cq(p->cq);
 978
 979         if (test_bit(IPOIB_FLAG_NETIF_STOPPED, &p->flags))
 980                 netif_wake_queue(p->dev);
 981
 982         if (p->tx_ring) {
 983                 while ((int) p->tx_tail - (int) p->tx_head < 0) {
 984                         tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
 985                         ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
 986                                          DMA_TO_DEVICE);
 987                         dev_kfree_skb_any(tx_req->skb);
 988                         ++p->tx_tail;
 989                 }
 990
 991                 kfree(p->tx_ring);
 992         }
 993
 994         kfree(p);
 995 }
 996
 997 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
 998                                struct ib_cm_event *event)
 999 {
1000         struct ipoib_cm_tx *tx = cm_id->context;
1001         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1002         struct net_device *dev = priv->dev;
1003         struct ipoib_neigh *neigh;
1004         int ret;
1005
1006         switch (event->event) {
1007         case IB_CM_DREQ_RECEIVED:
1008                 ipoib_dbg(priv, "DREQ received.\n");
1009                 ib_send_cm_drep(cm_id, NULL, 0);
1010                 break;
1011         case IB_CM_REP_RECEIVED:
1012                 ipoib_dbg(priv, "REP received.\n");
1013                 ret = ipoib_cm_rep_handler(cm_id, event);
1014                 if (ret)
1015                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1016                                        NULL, 0, NULL, 0);
1017                 break;
1018         case IB_CM_REQ_ERROR:
1019         case IB_CM_REJ_RECEIVED:
1020         case IB_CM_TIMEWAIT_EXIT:
1021                 ipoib_dbg(priv, "CM error %d.\n", event->event);
1022                 spin_lock_irq(&priv->tx_lock);
1023                 spin_lock(&priv->lock);
1024                 neigh = tx->neigh;
1025
1026                 if (neigh) {
1027                         neigh->cm = NULL;
1028                         list_del(&neigh->list);
1029                         if (neigh->ah)
1030                                 ipoib_put_ah(neigh->ah);
1031                         ipoib_neigh_free(dev, neigh);
1032
1033                         tx->neigh = NULL;
1034                 }
1035
1036                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1037                         list_move(&tx->list, &priv->cm.reap_list);
1038                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
1039                 }
1040
1041                 spin_unlock(&priv->lock);
1042                 spin_unlock_irq(&priv->tx_lock);
1043                 break;
1044         default:
1045                 break;
1046         }
1047
1048         return 0;
1049 }
1050
1051 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1052                                        struct ipoib_neigh *neigh)
1053 {
1054         struct ipoib_dev_priv *priv = netdev_priv(dev);
1055         struct ipoib_cm_tx *tx;
1056
1057         tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1058         if (!tx)
1059                 return NULL;
1060
1061         neigh->cm = tx;
1062         tx->neigh = neigh;
1063         tx->path = path;
1064         tx->dev = dev;
1065         list_add(&tx->list, &priv->cm.start_list);
1066         set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1067         queue_work(ipoib_workqueue, &priv->cm.start_task);
1068         return tx;
1069 }
1070
1071 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1072 {
1073         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1074         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1075                 list_move(&tx->list, &priv->cm.reap_list);
1076                 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1077                 ipoib_dbg(priv, "Reap connection for gid " IPOIB_GID_FMT "\n",
1078                           IPOIB_GID_ARG(tx->neigh->dgid));
1079                 tx->neigh = NULL;
1080         }
1081 }
1082
1083 static void ipoib_cm_tx_start(struct work_struct *work)
1084 {
1085         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1086                                                    cm.start_task);
1087         struct net_device *dev = priv->dev;
1088         struct ipoib_neigh *neigh;
1089         struct ipoib_cm_tx *p;
1090         unsigned long flags;
1091         int ret;
1092
1093         struct ib_sa_path_rec pathrec;
1094         u32 qpn;
1095
1096         spin_lock_irqsave(&priv->tx_lock, flags);
1097         spin_lock(&priv->lock);
1098         while (!list_empty(&priv->cm.start_list)) {
1099                 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1100                 list_del_init(&p->list);
1101                 neigh = p->neigh;
1102                 qpn = IPOIB_QPN(neigh->neighbour->ha);
1103                 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1104                 spin_unlock(&priv->lock);
1105                 spin_unlock_irqrestore(&priv->tx_lock, flags);
1106                 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1107                 spin_lock_irqsave(&priv->tx_lock, flags);
1108                 spin_lock(&priv->lock);
1109                 if (ret) {
1110                         neigh = p->neigh;
1111                         if (neigh) {
1112                                 neigh->cm = NULL;
1113                                 list_del(&neigh->list);
1114                                 if (neigh->ah)
1115                                         ipoib_put_ah(neigh->ah);
1116                                 ipoib_neigh_free(dev, neigh);
1117                         }
1118                         list_del(&p->list);
1119                         kfree(p);
1120                 }
1121         }
1122         spin_unlock(&priv->lock);
1123         spin_unlock_irqrestore(&priv->tx_lock, flags);
1124 }
1125
1126 static void ipoib_cm_tx_reap(struct work_struct *work)
1127 {
1128         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1129                                                    cm.reap_task);
1130         struct ipoib_cm_tx *p;
1131
1132         spin_lock_irq(&priv->tx_lock);
1133         spin_lock(&priv->lock);
1134         while (!list_empty(&priv->cm.reap_list)) {
1135                 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1136                 list_del(&p->list);
1137                 spin_unlock(&priv->lock);
1138                 spin_unlock_irq(&priv->tx_lock);
1139                 ipoib_cm_tx_destroy(p);
1140                 spin_lock_irq(&priv->tx_lock);
1141                 spin_lock(&priv->lock);
1142         }
1143         spin_unlock(&priv->lock);
1144         spin_unlock_irq(&priv->tx_lock);
1145 }
1146
1147 static void ipoib_cm_skb_reap(struct work_struct *work)
1148 {
1149         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1150                                                    cm.skb_task);
1151         struct net_device *dev = priv->dev;
1152         struct sk_buff *skb;
1153
1154         unsigned mtu = priv->mcast_mtu;
1155
1156         spin_lock_irq(&priv->tx_lock);
1157         spin_lock(&priv->lock);
1158         while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1159                 spin_unlock(&priv->lock);
1160                 spin_unlock_irq(&priv->tx_lock);
1161                 if (skb->protocol == htons(ETH_P_IP))
1162                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1163 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1164                 else if (skb->protocol == htons(ETH_P_IPV6))
1165                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
1166 #endif
1167                 dev_kfree_skb_any(skb);
1168                 spin_lock_irq(&priv->tx_lock);
1169                 spin_lock(&priv->lock);
1170         }
1171         spin_unlock(&priv->lock);
1172         spin_unlock_irq(&priv->tx_lock);
1173 }
1174
1175 void ipoib_cm_skb_too_long(struct net_device* dev, struct sk_buff *skb,
1176                            unsigned int mtu)
1177 {
1178         struct ipoib_dev_priv *priv = netdev_priv(dev);
1179         int e = skb_queue_empty(&priv->cm.skb_queue);
1180
1181         if (skb->dst)
1182                 skb->dst->ops->update_pmtu(skb->dst, mtu);
1183
1184         skb_queue_tail(&priv->cm.skb_queue, skb);
1185         if (e)
1186                 queue_work(ipoib_workqueue, &priv->cm.skb_task);
1187 }
1188
1189 static void ipoib_cm_rx_reap(struct work_struct *work)
1190 {
1191         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1192                                                    cm.rx_reap_task);
1193         struct ipoib_cm_rx *p, *n;
1194         LIST_HEAD(list);
1195
1196         spin_lock_irq(&priv->lock);
1197         list_splice_init(&priv->cm.rx_reap_list, &list);
1198         spin_unlock_irq(&priv->lock);
1199
1200         list_for_each_entry_safe(p, n, &list, list) {
1201                 ib_destroy_cm_id(p->id);
1202                 ib_destroy_qp(p->qp);
1203                 kfree(p);
1204         }
1205 }
1206
1207 static void ipoib_cm_stale_task(struct work_struct *work)
1208 {
1209         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1210                                                    cm.stale_task.work);
1211         struct ipoib_cm_rx *p;
1212         int ret;
1213
1214         spin_lock_irq(&priv->lock);
1215         while (!list_empty(&priv->cm.passive_ids)) {
1216                 /* List is sorted by LRU, start from tail,
1217                  * stop when we see a recently used entry */
1218                 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1219                 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1220                         break;
1221                 list_move(&p->list, &priv->cm.rx_error_list);
1222                 p->state = IPOIB_CM_RX_ERROR;
1223                 spin_unlock_irq(&priv->lock);
1224                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1225                 if (ret)
1226                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1227                 spin_lock_irq(&priv->lock);
1228         }
1229
1230         if (!list_empty(&priv->cm.passive_ids))
1231                 queue_delayed_work(ipoib_workqueue,
1232                                    &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1233         spin_unlock_irq(&priv->lock);
1234 }
1235
1236
1237 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1238                          char *buf)
1239 {
1240         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1241
1242         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1243                 return sprintf(buf, "connected\n");
1244         else
1245                 return sprintf(buf, "datagram\n");
1246 }
1247
1248 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1249                         const char *buf, size_t count)
1250 {
1251         struct net_device *dev = to_net_dev(d);
1252         struct ipoib_dev_priv *priv = netdev_priv(dev);
1253
1254         /* flush paths if we switch modes so that connections are restarted */
1255         if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
1256                 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1257                 ipoib_warn(priv, "enabling connected mode "
1258                            "will cause multicast packet drops\n");
1259                 ipoib_flush_paths(dev);
1260                 return count;
1261         }
1262
1263         if (!strcmp(buf, "datagram\n")) {
1264                 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1265                 dev->mtu = min(priv->mcast_mtu, dev->mtu);
1266                 ipoib_flush_paths(dev);
1267                 return count;
1268         }
1269
1270         return -EINVAL;
1271 }
1272
1273 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1274
1275 int ipoib_cm_add_mode_attr(struct net_device *dev)
1276 {
1277         return device_create_file(&dev->dev, &dev_attr_mode);
1278 }
1279
1280 int ipoib_cm_dev_init(struct net_device *dev)
1281 {
1282         struct ipoib_dev_priv *priv = netdev_priv(dev);
1283         struct ib_srq_init_attr srq_init_attr = {
1284                 .attr = {
1285                         .max_wr  = ipoib_recvq_size,
1286                         .max_sge = IPOIB_CM_RX_SG
1287                 }
1288         };
1289         int ret, i;
1290
1291         INIT_LIST_HEAD(&priv->cm.passive_ids);
1292         INIT_LIST_HEAD(&priv->cm.reap_list);
1293         INIT_LIST_HEAD(&priv->cm.start_list);
1294         INIT_LIST_HEAD(&priv->cm.rx_error_list);
1295         INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1296         INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1297         INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1298         INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1299         INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1300         INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1301         INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1302         INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1303
1304         skb_queue_head_init(&priv->cm.skb_queue);
1305
1306         priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1307         if (IS_ERR(priv->cm.srq)) {
1308                 ret = PTR_ERR(priv->cm.srq);
1309                 priv->cm.srq = NULL;
1310                 return ret;
1311         }
1312
1313         priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring,
1314                                     GFP_KERNEL);
1315         if (!priv->cm.srq_ring) {
1316                 printk(KERN_WARNING "%s: failed to allocate CM ring (%d entries)\n",
1317                        priv->ca->name, ipoib_recvq_size);
1318                 ipoib_cm_dev_cleanup(dev);
1319                 return -ENOMEM;
1320         }
1321
1322         for (i = 0; i < IPOIB_CM_RX_SG; ++i)
1323                 priv->cm.rx_sge[i].lkey = priv->mr->lkey;
1324
1325         priv->cm.rx_sge[0].length = IPOIB_CM_HEAD_SIZE;
1326         for (i = 1; i < IPOIB_CM_RX_SG; ++i)
1327                 priv->cm.rx_sge[i].length = PAGE_SIZE;
1328         priv->cm.rx_wr.next = NULL;
1329         priv->cm.rx_wr.sg_list = priv->cm.rx_sge;
1330         priv->cm.rx_wr.num_sge = IPOIB_CM_RX_SG;
1331
1332         for (i = 0; i < ipoib_recvq_size; ++i) {
1333                 if (!ipoib_cm_alloc_rx_skb(dev, i, IPOIB_CM_RX_SG - 1,
1334                                            priv->cm.srq_ring[i].mapping)) {
1335                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
1336                         ipoib_cm_dev_cleanup(dev);
1337                         return -ENOMEM;
1338                 }
1339                 if (ipoib_cm_post_receive(dev, i)) {
1340                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
1341                         ipoib_cm_dev_cleanup(dev);
1342                         return -EIO;
1343                 }
1344         }
1345
1346         priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1347         return 0;
1348 }
1349
1350 void ipoib_cm_dev_cleanup(struct net_device *dev)
1351 {
1352         struct ipoib_dev_priv *priv = netdev_priv(dev);
1353         int i, ret;
1354
1355         if (!priv->cm.srq)
1356                 return;
1357
1358         ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1359
1360         ret = ib_destroy_srq(priv->cm.srq);
1361         if (ret)
1362                 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1363
1364         priv->cm.srq = NULL;
1365         if (!priv->cm.srq_ring)
1366                 return;
1367         for (i = 0; i < ipoib_recvq_size; ++i)
1368                 if (priv->cm.srq_ring[i].skb) {
1369                         ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
1370                                               priv->cm.srq_ring[i].mapping);
1371                         dev_kfree_skb_any(priv->cm.srq_ring[i].skb);
1372                         priv->cm.srq_ring[i].skb = NULL;
1373                 }
1374         kfree(priv->cm.srq_ring);
1375         priv->cm.srq_ring = NULL;
1376 }