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ipoib_cm.c

/*
 * Copyright (c) 2006 Mellanox Technologies. All rights reserved
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id$
 */

#include <rdma/ib_cm.h>
#include <rdma/ib_cache.h>
#include <net/dst.h>
#include <net/icmp.h>
#include <linux/icmpv6.h>
#include <linux/delay.h>

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
static int data_debug_level;

module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
MODULE_PARM_DESC(cm_data_debug_level,
             "Enable data path debug tracing for connected mode if > 0");
#endif

#include "ipoib.h"

#define IPOIB_CM_IETF_ID 0x1000000000000000ULL

#define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
#define IPOIB_CM_RX_TIMEOUT     (2 * 256 * HZ)
#define IPOIB_CM_RX_DELAY       (3 * 256 * HZ)
#define IPOIB_CM_RX_UPDATE_MASK (0x3)

static struct ib_qp_attr ipoib_cm_err_attr = {
      .qp_state = IB_QPS_ERR
};

#define IPOIB_CM_RX_DRAIN_WRID 0xffffffff

static struct ib_send_wr ipoib_cm_rx_drain_wr = {
      .wr_id = IPOIB_CM_RX_DRAIN_WRID,
      .opcode = IB_WR_SEND,
};

static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
                         struct ib_cm_event *event);

static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
                          u64 mapping[IPOIB_CM_RX_SG])
{
      int i;

      ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);

      for (i = 0; i < frags; ++i)
            ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
}

static int ipoib_cm_post_receive(struct net_device *dev, int id)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ib_recv_wr *bad_wr;
      int i, ret;

      priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;

      for (i = 0; i < IPOIB_CM_RX_SG; ++i)
            priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];

      ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
      if (unlikely(ret)) {
            ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
            ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
                              priv->cm.srq_ring[id].mapping);
            dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
            priv->cm.srq_ring[id].skb = NULL;
      }

      return ret;
}

static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, int id, int frags,
                                   u64 mapping[IPOIB_CM_RX_SG])
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct sk_buff *skb;
      int i;

      skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
      if (unlikely(!skb))
            return NULL;

      /*
       * IPoIB adds a 4 byte header. So we need 12 more bytes to align the
       * IP header to a multiple of 16.
       */
      skb_reserve(skb, 12);

      mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
                               DMA_FROM_DEVICE);
      if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
            dev_kfree_skb_any(skb);
            return NULL;
      }

      for (i = 0; i < frags; i++) {
            struct page *page = alloc_page(GFP_ATOMIC);

            if (!page)
                  goto partial_error;
            skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);

            mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page,
                                     0, PAGE_SIZE, DMA_FROM_DEVICE);
            if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
                  goto partial_error;
      }

      priv->cm.srq_ring[id].skb = skb;
      return skb;

partial_error:

      ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);

      for (; i > 0; --i)
            ib_dma_unmap_single(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);

      dev_kfree_skb_any(skb);
      return NULL;
}

static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv* priv)
{
      struct ib_send_wr *bad_wr;
      struct ipoib_cm_rx *p;

      /* We only reserved 1 extra slot in CQ for drain WRs, so
       * make sure we have at most 1 outstanding WR. */
      if (list_empty(&priv->cm.rx_flush_list) ||
          !list_empty(&priv->cm.rx_drain_list))
            return;

      /*
       * QPs on flush list are error state.  This way, a "flush
       * error" WC will be immediately generated for each WR we post.
       */
      p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
      if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
            ipoib_warn(priv, "failed to post drain wr\n");

      list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
}

static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
{
      struct ipoib_cm_rx *p = ctx;
      struct ipoib_dev_priv *priv = netdev_priv(p->dev);
      unsigned long flags;

      if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
            return;

      spin_lock_irqsave(&priv->lock, flags);
      list_move(&p->list, &priv->cm.rx_flush_list);
      p->state = IPOIB_CM_RX_FLUSH;
      ipoib_cm_start_rx_drain(priv);
      spin_unlock_irqrestore(&priv->lock, flags);
}

static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
                                 struct ipoib_cm_rx *p)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ib_qp_init_attr attr = {
            .event_handler = ipoib_cm_rx_event_handler,
            .send_cq = priv->cq, /* For drain WR */
            .recv_cq = priv->cq,
            .srq = priv->cm.srq,
            .cap.max_send_wr = 1, /* For drain WR */
            .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
            .sq_sig_type = IB_SIGNAL_ALL_WR,
            .qp_type = IB_QPT_RC,
            .qp_context = p,
      };
      return ib_create_qp(priv->pd, &attr);
}

static int ipoib_cm_modify_rx_qp(struct net_device *dev,
                          struct ib_cm_id *cm_id, struct ib_qp *qp,
                          unsigned psn)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ib_qp_attr qp_attr;
      int qp_attr_mask, ret;

      qp_attr.qp_state = IB_QPS_INIT;
      ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
      if (ret) {
            ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
            return ret;
      }
      ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
      if (ret) {
            ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
            return ret;
      }
      qp_attr.qp_state = IB_QPS_RTR;
      ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
      if (ret) {
            ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
            return ret;
      }
      qp_attr.rq_psn = psn;
      ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
      if (ret) {
            ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
            return ret;
      }

      /*
       * Current Mellanox HCA firmware won't generate completions
       * with error for drain WRs unless the QP has been moved to
       * RTS first. This work-around leaves a window where a QP has
       * moved to error asynchronously, but this will eventually get
       * fixed in firmware, so let's not error out if modify QP
       * fails.
       */
      qp_attr.qp_state = IB_QPS_RTS;
      ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
      if (ret) {
            ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
            return 0;
      }
      ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
      if (ret) {
            ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
            return 0;
      }

      return 0;
}

static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
                       struct ib_qp *qp, struct ib_cm_req_event_param *req,
                       unsigned psn)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ipoib_cm_data data = {};
      struct ib_cm_rep_param rep = {};

      data.qpn = cpu_to_be32(priv->qp->qp_num);
      data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);

      rep.private_data = &data;
      rep.private_data_len = sizeof data;
      rep.flow_control = 0;
      rep.rnr_retry_count = req->rnr_retry_count;
      rep.srq = 1;
      rep.qp_num = qp->qp_num;
      rep.starting_psn = psn;
      return ib_send_cm_rep(cm_id, &rep);
}

static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
{
      struct net_device *dev = cm_id->context;
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ipoib_cm_rx *p;
      unsigned psn;
      int ret;

      ipoib_dbg(priv, "REQ arrived\n");
      p = kzalloc(sizeof *p, GFP_KERNEL);
      if (!p)
            return -ENOMEM;
      p->dev = dev;
      p->id = cm_id;
      cm_id->context = p;
      p->state = IPOIB_CM_RX_LIVE;
      p->jiffies = jiffies;
      INIT_LIST_HEAD(&p->list);

      p->qp = ipoib_cm_create_rx_qp(dev, p);
      if (IS_ERR(p->qp)) {
            ret = PTR_ERR(p->qp);
            goto err_qp;
      }

      psn = random32() & 0xffffff;
      ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
      if (ret)
            goto err_modify;

      spin_lock_irq(&priv->lock);
      queue_delayed_work(ipoib_workqueue,
                     &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
      /* Add this entry to passive ids list head, but do not re-add it
       * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
      p->jiffies = jiffies;
      if (p->state == IPOIB_CM_RX_LIVE)
            list_move(&p->list, &priv->cm.passive_ids);
      spin_unlock_irq(&priv->lock);

      ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
      if (ret) {
            ipoib_warn(priv, "failed to send REP: %d\n", ret);
            if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
                  ipoib_warn(priv, "unable to move qp to error state\n");
      }
      return 0;

err_modify:
      ib_destroy_qp(p->qp);
err_qp:
      kfree(p);
      return ret;
}

static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
                         struct ib_cm_event *event)
{
      struct ipoib_cm_rx *p;
      struct ipoib_dev_priv *priv;

      switch (event->event) {
      case IB_CM_REQ_RECEIVED:
            return ipoib_cm_req_handler(cm_id, event);
      case IB_CM_DREQ_RECEIVED:
            p = cm_id->context;
            ib_send_cm_drep(cm_id, NULL, 0);
            /* Fall through */
      case IB_CM_REJ_RECEIVED:
            p = cm_id->context;
            priv = netdev_priv(p->dev);
            if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
                  ipoib_warn(priv, "unable to move qp to error state\n");
            /* Fall through */
      default:
            return 0;
      }
}
/* Adjust length of skb with fragments to match received data */
static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
                    unsigned int length, struct sk_buff *toskb)
{
      int i, num_frags;
      unsigned int size;

      /* put header into skb */
      size = min(length, hdr_space);
      skb->tail += size;
      skb->len += size;
      length -= size;

      num_frags = skb_shinfo(skb)->nr_frags;
      for (i = 0; i < num_frags; i++) {
            skb_frag_t *frag = &skb_shinfo(skb)->frags[i];

            if (length == 0) {
                  /* don't need this page */
                  skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE);
                  --skb_shinfo(skb)->nr_frags;
            } else {
                  size = min(length, (unsigned) PAGE_SIZE);

                  frag->size = size;
                  skb->data_len += size;
                  skb->truesize += size;
                  skb->len += size;
                  length -= size;
            }
      }
}

void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
      struct sk_buff *skb, *newskb;
      struct ipoib_cm_rx *p;
      unsigned long flags;
      u64 mapping[IPOIB_CM_RX_SG];
      int frags;

      ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
                   wr_id, wc->status);

      if (unlikely(wr_id >= ipoib_recvq_size)) {
            if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
                  spin_lock_irqsave(&priv->lock, flags);
                  list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
                  ipoib_cm_start_rx_drain(priv);
                  queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
                  spin_unlock_irqrestore(&priv->lock, flags);
            } else
                  ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
                           wr_id, ipoib_recvq_size);
            return;
      }

      skb  = priv->cm.srq_ring[wr_id].skb;

      if (unlikely(wc->status != IB_WC_SUCCESS)) {
            ipoib_dbg(priv, "cm recv error "
                     "(status=%d, wrid=%d vend_err %x)\n",
                     wc->status, wr_id, wc->vendor_err);
            ++dev->stats.rx_dropped;
            goto repost;
      }

      if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
            p = wc->qp->qp_context;
            if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
                  spin_lock_irqsave(&priv->lock, flags);
                  p->jiffies = jiffies;
                  /* Move this entry to list head, but do not re-add it
                   * if it has been moved out of list. */
                  if (p->state == IPOIB_CM_RX_LIVE)
                        list_move(&p->list, &priv->cm.passive_ids);
                  spin_unlock_irqrestore(&priv->lock, flags);
            }
      }

      frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
                                    (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;

      newskb = ipoib_cm_alloc_rx_skb(dev, wr_id, frags, mapping);
      if (unlikely(!newskb)) {
            /*
             * If we can't allocate a new RX buffer, dump
             * this packet and reuse the old buffer.
             */
            ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
            ++dev->stats.rx_dropped;
            goto repost;
      }

      ipoib_cm_dma_unmap_rx(priv, frags, priv->cm.srq_ring[wr_id].mapping);
      memcpy(priv->cm.srq_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);

      ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
                   wc->byte_len, wc->slid);

      skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);

      skb->protocol = ((struct ipoib_header *) skb->data)->proto;
      skb_reset_mac_header(skb);
      skb_pull(skb, IPOIB_ENCAP_LEN);

      dev->last_rx = jiffies;
      ++dev->stats.rx_packets;
      dev->stats.rx_bytes += skb->len;

      skb->dev = dev;
      /* XXX get correct PACKET_ type here */
      skb->pkt_type = PACKET_HOST;
      netif_receive_skb(skb);

repost:
      if (unlikely(ipoib_cm_post_receive(dev, wr_id)))
            ipoib_warn(priv, "ipoib_cm_post_receive failed "
                     "for buf %d\n", wr_id);
}

static inline int post_send(struct ipoib_dev_priv *priv,
                      struct ipoib_cm_tx *tx,
                      unsigned int wr_id,
                      u64 addr, int len)
{
      struct ib_send_wr *bad_wr;

      priv->tx_sge.addr             = addr;
      priv->tx_sge.length           = len;

      priv->tx_wr.wr_id             = wr_id | IPOIB_OP_CM;

      return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
}

void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ipoib_tx_buf *tx_req;
      u64 addr;

      if (unlikely(skb->len > tx->mtu)) {
            ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
                     skb->len, tx->mtu);
            ++dev->stats.tx_dropped;
            ++dev->stats.tx_errors;
            ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
            return;
      }

      ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
                   tx->tx_head, skb->len, tx->qp->qp_num);

      /*
       * We put the skb into the tx_ring _before_ we call post_send()
       * because it's entirely possible that the completion handler will
       * run before we execute anything after the post_send().  That
       * means we have to make sure everything is properly recorded and
       * our state is consistent before we call post_send().
       */
      tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
      tx_req->skb = skb;
      addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
      if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
            ++dev->stats.tx_errors;
            dev_kfree_skb_any(skb);
            return;
      }

      tx_req->mapping = addr;

      if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
                          addr, skb->len))) {
            ipoib_warn(priv, "post_send failed\n");
            ++dev->stats.tx_errors;
            ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
            dev_kfree_skb_any(skb);
      } else {
            dev->trans_start = jiffies;
            ++tx->tx_head;

            if (++priv->tx_outstanding == ipoib_sendq_size) {
                  ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
                          tx->qp->qp_num);
                  netif_stop_queue(dev);
            }
      }
}

void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ipoib_cm_tx *tx = wc->qp->qp_context;
      unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
      struct ipoib_tx_buf *tx_req;
      unsigned long flags;

      ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
                   wr_id, wc->status);

      if (unlikely(wr_id >= ipoib_sendq_size)) {
            ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
                     wr_id, ipoib_sendq_size);
            return;
      }

      tx_req = &tx->tx_ring[wr_id];

      ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);

      /* FIXME: is this right? Shouldn't we only increment on success? */
      ++dev->stats.tx_packets;
      dev->stats.tx_bytes += tx_req->skb->len;

      dev_kfree_skb_any(tx_req->skb);

      spin_lock_irqsave(&priv->tx_lock, flags);
      ++tx->tx_tail;
      if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
          netif_queue_stopped(dev) &&
          test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
            netif_wake_queue(dev);

      if (wc->status != IB_WC_SUCCESS &&
          wc->status != IB_WC_WR_FLUSH_ERR) {
            struct ipoib_neigh *neigh;

            ipoib_dbg(priv, "failed cm send event "
                     "(status=%d, wrid=%d vend_err %x)\n",
                     wc->status, wr_id, wc->vendor_err);

            spin_lock(&priv->lock);
            neigh = tx->neigh;

            if (neigh) {
                  neigh->cm = NULL;
                  list_del(&neigh->list);
                  if (neigh->ah)
                        ipoib_put_ah(neigh->ah);
                  ipoib_neigh_free(dev, neigh);

                  tx->neigh = NULL;
            }

            if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
                  list_move(&tx->list, &priv->cm.reap_list);
                  queue_work(ipoib_workqueue, &priv->cm.reap_task);
            }

            clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);

            spin_unlock(&priv->lock);
      }

      spin_unlock_irqrestore(&priv->tx_lock, flags);
}

int ipoib_cm_dev_open(struct net_device *dev)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      int ret;

      if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
            return 0;

      priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
      if (IS_ERR(priv->cm.id)) {
            printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
            ret = PTR_ERR(priv->cm.id);
            goto err_cm;
      }

      ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
                     0, NULL);
      if (ret) {
            printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
                   IPOIB_CM_IETF_ID | priv->qp->qp_num);
            goto err_listen;
      }

      return 0;

err_listen:
      ib_destroy_cm_id(priv->cm.id);
err_cm:
      priv->cm.id = NULL;
      return ret;
}

void ipoib_cm_dev_stop(struct net_device *dev)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ipoib_cm_rx *p, *n;
      unsigned long begin;
      LIST_HEAD(list);
      int ret;

      if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
            return;

      ib_destroy_cm_id(priv->cm.id);
      priv->cm.id = NULL;

      spin_lock_irq(&priv->lock);
      while (!list_empty(&priv->cm.passive_ids)) {
            p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
            list_move(&p->list, &priv->cm.rx_error_list);
            p->state = IPOIB_CM_RX_ERROR;
            spin_unlock_irq(&priv->lock);
            ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
            if (ret)
                  ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
            spin_lock_irq(&priv->lock);
      }

      /* Wait for all RX to be drained */
      begin = jiffies;

      while (!list_empty(&priv->cm.rx_error_list) ||
             !list_empty(&priv->cm.rx_flush_list) ||
             !list_empty(&priv->cm.rx_drain_list)) {
            if (time_after(jiffies, begin + 5 * HZ)) {
                  ipoib_warn(priv, "RX drain timing out\n");

                  /*
                   * assume the HW is wedged and just free up everything.
                   */
                  list_splice_init(&priv->cm.rx_flush_list, &list);
                  list_splice_init(&priv->cm.rx_error_list, &list);
                  list_splice_init(&priv->cm.rx_drain_list, &list);
                  break;
            }
            spin_unlock_irq(&priv->lock);
            msleep(1);
            ipoib_drain_cq(dev);
            spin_lock_irq(&priv->lock);
      }

      list_splice_init(&priv->cm.rx_reap_list, &list);

      spin_unlock_irq(&priv->lock);

      list_for_each_entry_safe(p, n, &list, list) {
            ib_destroy_cm_id(p->id);
            ib_destroy_qp(p->qp);
            kfree(p);
      }

      cancel_delayed_work(&priv->cm.stale_task);
}

static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
{
      struct ipoib_cm_tx *p = cm_id->context;
      struct ipoib_dev_priv *priv = netdev_priv(p->dev);
      struct ipoib_cm_data *data = event->private_data;
      struct sk_buff_head skqueue;
      struct ib_qp_attr qp_attr;
      int qp_attr_mask, ret;
      struct sk_buff *skb;

      p->mtu = be32_to_cpu(data->mtu);

      if (p->mtu <= IPOIB_ENCAP_LEN) {
            ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
                     p->mtu, IPOIB_ENCAP_LEN);
            return -EINVAL;
      }

      qp_attr.qp_state = IB_QPS_RTR;
      ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
      if (ret) {
            ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
            return ret;
      }

      qp_attr.rq_psn = 0 /* FIXME */;
      ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
      if (ret) {
            ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
            return ret;
      }

      qp_attr.qp_state = IB_QPS_RTS;
      ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
      if (ret) {
            ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
            return ret;
      }
      ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
      if (ret) {
            ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
            return ret;
      }

      skb_queue_head_init(&skqueue);

      spin_lock_irq(&priv->lock);
      set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
      if (p->neigh)
            while ((skb = __skb_dequeue(&p->neigh->queue)))
                  __skb_queue_tail(&skqueue, skb);
      spin_unlock_irq(&priv->lock);

      while ((skb = __skb_dequeue(&skqueue))) {
            skb->dev = p->dev;
            if (dev_queue_xmit(skb))
                  ipoib_warn(priv, "dev_queue_xmit failed "
                           "to requeue packet\n");
      }

      ret = ib_send_cm_rtu(cm_id, NULL, 0);
      if (ret) {
            ipoib_warn(priv, "failed to send RTU: %d\n", ret);
            return ret;
      }
      return 0;
}

static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ib_qp_init_attr attr = {
            .send_cq          = priv->cq,
            .recv_cq          = priv->cq,
            .srq              = priv->cm.srq,
            .cap.max_send_wr  = ipoib_sendq_size,
            .cap.max_send_sge = 1,
            .sq_sig_type            = IB_SIGNAL_ALL_WR,
            .qp_type          = IB_QPT_RC,
            .qp_context       = tx
        };

      return ib_create_qp(priv->pd, &attr);
}

static int ipoib_cm_send_req(struct net_device *dev,
                       struct ib_cm_id *id, struct ib_qp *qp,
                       u32 qpn,
                       struct ib_sa_path_rec *pathrec)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ipoib_cm_data data = {};
      struct ib_cm_req_param req = {};

      data.qpn = cpu_to_be32(priv->qp->qp_num);
      data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);

      req.primary_path        = pathrec;
      req.alternate_path            = NULL;
      req.service_id                = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
      req.qp_num              = qp->qp_num;
      req.qp_type                   = qp->qp_type;
      req.private_data        = &data;
      req.private_data_len          = sizeof data;
      req.flow_control        = 0;

      req.starting_psn              = 0; /* FIXME */

      /*
       * Pick some arbitrary defaults here; we could make these
       * module parameters if anyone cared about setting them.
       */
      req.responder_resources       = 4;
      req.remote_cm_response_timeout = 20;
      req.local_cm_response_timeout  = 20;
      req.retry_count         = 0; /* RFC draft warns against retries */
      req.rnr_retry_count           = 0; /* RFC draft warns against retries */
      req.max_cm_retries            = 15;
      req.srq                   = 1;
      return ib_send_cm_req(id, &req);
}

static int ipoib_cm_modify_tx_init(struct net_device *dev,
                          struct ib_cm_id *cm_id, struct ib_qp *qp)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ib_qp_attr qp_attr;
      int qp_attr_mask, ret;
      ret = ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
      if (ret) {
            ipoib_warn(priv, "pkey 0x%x not in cache: %d\n", priv->pkey, ret);
            return ret;
      }

      qp_attr.qp_state = IB_QPS_INIT;
      qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
      qp_attr.port_num = priv->port;
      qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;

      ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
      if (ret) {
            ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
            return ret;
      }
      return 0;
}

static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
                      struct ib_sa_path_rec *pathrec)
{
      struct ipoib_dev_priv *priv = netdev_priv(p->dev);
      int ret;

      p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring,
                        GFP_KERNEL);
      if (!p->tx_ring) {
            ipoib_warn(priv, "failed to allocate tx ring\n");
            ret = -ENOMEM;
            goto err_tx;
      }

      p->qp = ipoib_cm_create_tx_qp(p->dev, p);
      if (IS_ERR(p->qp)) {
            ret = PTR_ERR(p->qp);
            ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
            goto err_qp;
      }

      p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
      if (IS_ERR(p->id)) {
            ret = PTR_ERR(p->id);
            ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
            goto err_id;
      }

      ret = ipoib_cm_modify_tx_init(p->dev, p->id,  p->qp);
      if (ret) {
            ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
            goto err_modify;
      }

      ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
      if (ret) {
            ipoib_warn(priv, "failed to send cm req: %d\n", ret);
            goto err_send_cm;
      }

      ipoib_dbg(priv, "Request connection 0x%x for gid " IPOIB_GID_FMT " qpn 0x%x\n",
              p->qp->qp_num, IPOIB_GID_ARG(pathrec->dgid), qpn);

      return 0;

err_send_cm:
err_modify:
      ib_destroy_cm_id(p->id);
err_id:
      p->id = NULL;
      ib_destroy_qp(p->qp);
err_qp:
      p->qp = NULL;
err_tx:
      return ret;
}

static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
{
      struct ipoib_dev_priv *priv = netdev_priv(p->dev);
      struct ipoib_tx_buf *tx_req;
      unsigned long flags;
      unsigned long begin;

      ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
              p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);

      if (p->id)
            ib_destroy_cm_id(p->id);

      if (p->tx_ring) {
            /* Wait for all sends to complete */
            begin = jiffies;
            while ((int) p->tx_tail - (int) p->tx_head < 0) {
                  if (time_after(jiffies, begin + 5 * HZ)) {
                        ipoib_warn(priv, "timing out; %d sends not completed\n",
                                 p->tx_head - p->tx_tail);
                        goto timeout;
                  }

                  msleep(1);
            }
      }

timeout:

      while ((int) p->tx_tail - (int) p->tx_head < 0) {
            tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
            ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
                            DMA_TO_DEVICE);
            dev_kfree_skb_any(tx_req->skb);
            ++p->tx_tail;
            spin_lock_irqsave(&priv->tx_lock, flags);
            if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
                netif_queue_stopped(p->dev) &&
                test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
                  netif_wake_queue(p->dev);
            spin_unlock_irqrestore(&priv->tx_lock, flags);
      }

      if (p->qp)
            ib_destroy_qp(p->qp);

      kfree(p->tx_ring);
      kfree(p);
}

static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
                         struct ib_cm_event *event)
{
      struct ipoib_cm_tx *tx = cm_id->context;
      struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
      struct net_device *dev = priv->dev;
      struct ipoib_neigh *neigh;
      int ret;

      switch (event->event) {
      case IB_CM_DREQ_RECEIVED:
            ipoib_dbg(priv, "DREQ received.\n");
            ib_send_cm_drep(cm_id, NULL, 0);
            break;
      case IB_CM_REP_RECEIVED:
            ipoib_dbg(priv, "REP received.\n");
            ret = ipoib_cm_rep_handler(cm_id, event);
            if (ret)
                  ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
                               NULL, 0, NULL, 0);
            break;
      case IB_CM_REQ_ERROR:
      case IB_CM_REJ_RECEIVED:
      case IB_CM_TIMEWAIT_EXIT:
            ipoib_dbg(priv, "CM error %d.\n", event->event);
            spin_lock_irq(&priv->tx_lock);
            spin_lock(&priv->lock);
            neigh = tx->neigh;

            if (neigh) {
                  neigh->cm = NULL;
                  list_del(&neigh->list);
                  if (neigh->ah)
                        ipoib_put_ah(neigh->ah);
                  ipoib_neigh_free(dev, neigh);

                  tx->neigh = NULL;
            }

            if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
                  list_move(&tx->list, &priv->cm.reap_list);
                  queue_work(ipoib_workqueue, &priv->cm.reap_task);
            }

            spin_unlock(&priv->lock);
            spin_unlock_irq(&priv->tx_lock);
            break;
      default:
            break;
      }

      return 0;
}

struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
                               struct ipoib_neigh *neigh)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ipoib_cm_tx *tx;

      tx = kzalloc(sizeof *tx, GFP_ATOMIC);
      if (!tx)
            return NULL;

      neigh->cm = tx;
      tx->neigh = neigh;
      tx->path = path;
      tx->dev = dev;
      list_add(&tx->list, &priv->cm.start_list);
      set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
      queue_work(ipoib_workqueue, &priv->cm.start_task);
      return tx;
}

void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
{
      struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
      if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
            list_move(&tx->list, &priv->cm.reap_list);
            queue_work(ipoib_workqueue, &priv->cm.reap_task);
            ipoib_dbg(priv, "Reap connection for gid " IPOIB_GID_FMT "\n",
                    IPOIB_GID_ARG(tx->neigh->dgid));
            tx->neigh = NULL;
      }
}

static void ipoib_cm_tx_start(struct work_struct *work)
{
      struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
                                       cm.start_task);
      struct net_device *dev = priv->dev;
      struct ipoib_neigh *neigh;
      struct ipoib_cm_tx *p;
      unsigned long flags;
      int ret;

      struct ib_sa_path_rec pathrec;
      u32 qpn;

      spin_lock_irqsave(&priv->tx_lock, flags);
      spin_lock(&priv->lock);
      while (!list_empty(&priv->cm.start_list)) {
            p = list_entry(priv->cm.start_list.next, typeof(*p), list);
            list_del_init(&p->list);
            neigh = p->neigh;
            qpn = IPOIB_QPN(neigh->neighbour->ha);
            memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
            spin_unlock(&priv->lock);
            spin_unlock_irqrestore(&priv->tx_lock, flags);
            ret = ipoib_cm_tx_init(p, qpn, &pathrec);
            spin_lock_irqsave(&priv->tx_lock, flags);
            spin_lock(&priv->lock);
            if (ret) {
                  neigh = p->neigh;
                  if (neigh) {
                        neigh->cm = NULL;
                        list_del(&neigh->list);
                        if (neigh->ah)
                              ipoib_put_ah(neigh->ah);
                        ipoib_neigh_free(dev, neigh);
                  }
                  list_del(&p->list);
                  kfree(p);
            }
      }
      spin_unlock(&priv->lock);
      spin_unlock_irqrestore(&priv->tx_lock, flags);
}

static void ipoib_cm_tx_reap(struct work_struct *work)
{
      struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
                                       cm.reap_task);
      struct ipoib_cm_tx *p;

      spin_lock_irq(&priv->tx_lock);
      spin_lock(&priv->lock);
      while (!list_empty(&priv->cm.reap_list)) {
            p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
            list_del(&p->list);
            spin_unlock(&priv->lock);
            spin_unlock_irq(&priv->tx_lock);
            ipoib_cm_tx_destroy(p);
            spin_lock_irq(&priv->tx_lock);
            spin_lock(&priv->lock);
      }
      spin_unlock(&priv->lock);
      spin_unlock_irq(&priv->tx_lock);
}

static void ipoib_cm_skb_reap(struct work_struct *work)
{
      struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
                                       cm.skb_task);
      struct sk_buff *skb;

      unsigned mtu = priv->mcast_mtu;

      spin_lock_irq(&priv->tx_lock);
      spin_lock(&priv->lock);
      while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
            spin_unlock(&priv->lock);
            spin_unlock_irq(&priv->tx_lock);
            if (skb->protocol == htons(ETH_P_IP))
                  icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
            else if (skb->protocol == htons(ETH_P_IPV6))
                  icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, priv->dev);
#endif
            dev_kfree_skb_any(skb);
            spin_lock_irq(&priv->tx_lock);
            spin_lock(&priv->lock);
      }
      spin_unlock(&priv->lock);
      spin_unlock_irq(&priv->tx_lock);
}

void ipoib_cm_skb_too_long(struct net_device* dev, struct sk_buff *skb,
                     unsigned int mtu)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      int e = skb_queue_empty(&priv->cm.skb_queue);

      if (skb->dst)
            skb->dst->ops->update_pmtu(skb->dst, mtu);

      skb_queue_tail(&priv->cm.skb_queue, skb);
      if (e)
            queue_work(ipoib_workqueue, &priv->cm.skb_task);
}

static void ipoib_cm_rx_reap(struct work_struct *work)
{
      struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
                                       cm.rx_reap_task);
      struct ipoib_cm_rx *p, *n;
      LIST_HEAD(list);

      spin_lock_irq(&priv->lock);
      list_splice_init(&priv->cm.rx_reap_list, &list);
      spin_unlock_irq(&priv->lock);

      list_for_each_entry_safe(p, n, &list, list) {
            ib_destroy_cm_id(p->id);
            ib_destroy_qp(p->qp);
            kfree(p);
      }
}

static void ipoib_cm_stale_task(struct work_struct *work)
{
      struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
                                       cm.stale_task.work);
      struct ipoib_cm_rx *p;
      int ret;

      spin_lock_irq(&priv->lock);
      while (!list_empty(&priv->cm.passive_ids)) {
            /* List is sorted by LRU, start from tail,
             * stop when we see a recently used entry */
            p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
            if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
                  break;
            list_move(&p->list, &priv->cm.rx_error_list);
            p->state = IPOIB_CM_RX_ERROR;
            spin_unlock_irq(&priv->lock);
            ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
            if (ret)
                  ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
            spin_lock_irq(&priv->lock);
      }

      if (!list_empty(&priv->cm.passive_ids))
            queue_delayed_work(ipoib_workqueue,
                           &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
      spin_unlock_irq(&priv->lock);
}


static ssize_t show_mode(struct device *d, struct device_attribute *attr, 
                   char *buf)
{
      struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));

      if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
            return sprintf(buf, "connected\n");
      else
            return sprintf(buf, "datagram\n");
}

static ssize_t set_mode(struct device *d, struct device_attribute *attr,
                  const char *buf, size_t count)
{
      struct net_device *dev = to_net_dev(d);
      struct ipoib_dev_priv *priv = netdev_priv(dev);

      /* flush paths if we switch modes so that connections are restarted */
      if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
            set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
            ipoib_warn(priv, "enabling connected mode "
                     "will cause multicast packet drops\n");
            ipoib_flush_paths(dev);
            return count;
      }

      if (!strcmp(buf, "datagram\n")) {
            clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
            dev->mtu = min(priv->mcast_mtu, dev->mtu);
            ipoib_flush_paths(dev);
            return count;
      }

      return -EINVAL;
}

static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);

int ipoib_cm_add_mode_attr(struct net_device *dev)
{
      return device_create_file(&dev->dev, &dev_attr_mode);
}

int ipoib_cm_dev_init(struct net_device *dev)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ib_srq_init_attr srq_init_attr = {
            .attr = {
                  .max_wr  = ipoib_recvq_size,
                  .max_sge = IPOIB_CM_RX_SG
            }
      };
      int ret, i;

      INIT_LIST_HEAD(&priv->cm.passive_ids);
      INIT_LIST_HEAD(&priv->cm.reap_list);
      INIT_LIST_HEAD(&priv->cm.start_list);
      INIT_LIST_HEAD(&priv->cm.rx_error_list);
      INIT_LIST_HEAD(&priv->cm.rx_flush_list);
      INIT_LIST_HEAD(&priv->cm.rx_drain_list);
      INIT_LIST_HEAD(&priv->cm.rx_reap_list);
      INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
      INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
      INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
      INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
      INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);

      skb_queue_head_init(&priv->cm.skb_queue);

      priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
      if (IS_ERR(priv->cm.srq)) {
            ret = PTR_ERR(priv->cm.srq);
            priv->cm.srq = NULL;
            return ret;
      }

      priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring,
                            GFP_KERNEL);
      if (!priv->cm.srq_ring) {
            printk(KERN_WARNING "%s: failed to allocate CM ring (%d entries)\n",
                   priv->ca->name, ipoib_recvq_size);
            ipoib_cm_dev_cleanup(dev);
            return -ENOMEM;
      }

      for (i = 0; i < IPOIB_CM_RX_SG; ++i)
            priv->cm.rx_sge[i].lkey = priv->mr->lkey;

      priv->cm.rx_sge[0].length = IPOIB_CM_HEAD_SIZE;
      for (i = 1; i < IPOIB_CM_RX_SG; ++i)
            priv->cm.rx_sge[i].length = PAGE_SIZE;
      priv->cm.rx_wr.next = NULL;
      priv->cm.rx_wr.sg_list = priv->cm.rx_sge;
      priv->cm.rx_wr.num_sge = IPOIB_CM_RX_SG;

      for (i = 0; i < ipoib_recvq_size; ++i) {
            if (!ipoib_cm_alloc_rx_skb(dev, i, IPOIB_CM_RX_SG - 1,
                                 priv->cm.srq_ring[i].mapping)) {
                  ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
                  ipoib_cm_dev_cleanup(dev);
                  return -ENOMEM;
            }
            if (ipoib_cm_post_receive(dev, i)) {
                  ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
                  ipoib_cm_dev_cleanup(dev);
                  return -EIO;
            }
      }

      priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
      return 0;
}

void ipoib_cm_dev_cleanup(struct net_device *dev)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      int i, ret;

      if (!priv->cm.srq)
            return;

      ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");

      ret = ib_destroy_srq(priv->cm.srq);
      if (ret)
            ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);

      priv->cm.srq = NULL;
      if (!priv->cm.srq_ring)
            return;
      for (i = 0; i < ipoib_recvq_size; ++i)
            if (priv->cm.srq_ring[i].skb) {
                  ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
                                    priv->cm.srq_ring[i].mapping);
                  dev_kfree_skb_any(priv->cm.srq_ring[i].skb);
                  priv->cm.srq_ring[i].skb = NULL;
            }
      kfree(priv->cm.srq_ring);
      priv->cm.srq_ring = NULL;
}

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