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ipoib_ib.c

/*
 * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2004, 2005 Voltaire, Inc. 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: ipoib_ib.c 1386 2004-12-27 16:23:17Z roland $
 */

#include <linux/delay.h>
#include <linux/dma-mapping.h>

#include <rdma/ib_cache.h>

#include "ipoib.h"

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
static int data_debug_level;

module_param(data_debug_level, int, 0644);
MODULE_PARM_DESC(data_debug_level,
             "Enable data path debug tracing if > 0");
#endif

static DEFINE_MUTEX(pkey_mutex);

struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
                         struct ib_pd *pd, struct ib_ah_attr *attr)
{
      struct ipoib_ah *ah;

      ah = kmalloc(sizeof *ah, GFP_KERNEL);
      if (!ah)
            return NULL;

      ah->dev       = dev;
      ah->last_send = 0;
      kref_init(&ah->ref);

      ah->ah = ib_create_ah(pd, attr);
      if (IS_ERR(ah->ah)) {
            kfree(ah);
            ah = NULL;
      } else
            ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);

      return ah;
}

void ipoib_free_ah(struct kref *kref)
{
      struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
      struct ipoib_dev_priv *priv = netdev_priv(ah->dev);

      unsigned long flags;

      spin_lock_irqsave(&priv->lock, flags);
      list_add_tail(&ah->list, &priv->dead_ahs);
      spin_unlock_irqrestore(&priv->lock, flags);
}

static int ipoib_ib_post_receive(struct net_device *dev, int id)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ib_sge list;
      struct ib_recv_wr param;
      struct ib_recv_wr *bad_wr;
      int ret;

      list.addr     = priv->rx_ring[id].mapping;
      list.length   = IPOIB_BUF_SIZE;
      list.lkey     = priv->mr->lkey;

      param.next    = NULL;
      param.wr_id   = id | IPOIB_OP_RECV;
      param.sg_list = &list;
      param.num_sge = 1;

      ret = ib_post_recv(priv->qp, &param, &bad_wr);
      if (unlikely(ret)) {
            ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
            ib_dma_unmap_single(priv->ca, priv->rx_ring[id].mapping,
                            IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
            dev_kfree_skb_any(priv->rx_ring[id].skb);
            priv->rx_ring[id].skb = NULL;
      }

      return ret;
}

static int ipoib_alloc_rx_skb(struct net_device *dev, int id)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct sk_buff *skb;
      u64 addr;

      skb = dev_alloc_skb(IPOIB_BUF_SIZE + 4);
      if (!skb)
            return -ENOMEM;

      /*
       * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
       * header.  So we need 4 more bytes to get to 48 and align the
       * IP header to a multiple of 16.
       */
      skb_reserve(skb, 4);

      addr = ib_dma_map_single(priv->ca, skb->data, IPOIB_BUF_SIZE,
                         DMA_FROM_DEVICE);
      if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
            dev_kfree_skb_any(skb);
            return -EIO;
      }

      priv->rx_ring[id].skb     = skb;
      priv->rx_ring[id].mapping = addr;

      return 0;
}

static int ipoib_ib_post_receives(struct net_device *dev)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      int i;

      for (i = 0; i < ipoib_recvq_size; ++i) {
            if (ipoib_alloc_rx_skb(dev, i)) {
                  ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
                  return -ENOMEM;
            }
            if (ipoib_ib_post_receive(dev, i)) {
                  ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
                  return -EIO;
            }
      }

      return 0;
}

static void ipoib_ib_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_RECV;
      struct sk_buff *skb;
      u64 addr;

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

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

      skb  = priv->rx_ring[wr_id].skb;
      addr = priv->rx_ring[wr_id].mapping;

      if (unlikely(wc->status != IB_WC_SUCCESS)) {
            if (wc->status != IB_WC_WR_FLUSH_ERR)
                  ipoib_warn(priv, "failed recv event "
                           "(status=%d, wrid=%d vend_err %x)\n",
                           wc->status, wr_id, wc->vendor_err);
            ib_dma_unmap_single(priv->ca, addr,
                            IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
            dev_kfree_skb_any(skb);
            priv->rx_ring[wr_id].skb = NULL;
            return;
      }

      /*
       * Drop packets that this interface sent, ie multicast packets
       * that the HCA has replicated.
       */
      if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
            goto repost;

      /*
       * If we can't allocate a new RX buffer, dump
       * this packet and reuse the old buffer.
       */
      if (unlikely(ipoib_alloc_rx_skb(dev, wr_id))) {
            ++dev->stats.rx_dropped;
            goto repost;
      }

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

      ib_dma_unmap_single(priv->ca, addr, IPOIB_BUF_SIZE, DMA_FROM_DEVICE);

      skb_put(skb, wc->byte_len);
      skb_pull(skb, IB_GRH_BYTES);

      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_ib_post_receive(dev, wr_id)))
            ipoib_warn(priv, "ipoib_ib_post_receive failed "
                     "for buf %d\n", wr_id);
}

static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      unsigned int wr_id = wc->wr_id;
      struct ipoib_tx_buf *tx_req;
      unsigned long flags;

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

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

      tx_req = &priv->tx_ring[wr_id];

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

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

      if (wc->status != IB_WC_SUCCESS &&
          wc->status != IB_WC_WR_FLUSH_ERR)
            ipoib_warn(priv, "failed send event "
                     "(status=%d, wrid=%d vend_err %x)\n",
                     wc->status, wr_id, wc->vendor_err);
}

int ipoib_poll(struct napi_struct *napi, int budget)
{
      struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
      struct net_device *dev = priv->dev;
      int done;
      int t;
      int n, i;

      done  = 0;

poll_more:
      while (done < budget) {
            int max = (budget - done);

            t = min(IPOIB_NUM_WC, max);
            n = ib_poll_cq(priv->cq, t, priv->ibwc);

            for (i = 0; i < n; i++) {
                  struct ib_wc *wc = priv->ibwc + i;

                  if (wc->wr_id & IPOIB_OP_RECV) {
                        ++done;
                        if (wc->wr_id & IPOIB_OP_CM)
                              ipoib_cm_handle_rx_wc(dev, wc);
                        else
                              ipoib_ib_handle_rx_wc(dev, wc);
                  } else {
                        if (wc->wr_id & IPOIB_OP_CM)
                              ipoib_cm_handle_tx_wc(dev, wc);
                        else
                              ipoib_ib_handle_tx_wc(dev, wc);
                  }
            }

            if (n != t)
                  break;
      }

      if (done < budget) {
            netif_rx_complete(dev, napi);
            if (unlikely(ib_req_notify_cq(priv->cq,
                                    IB_CQ_NEXT_COMP |
                                    IB_CQ_REPORT_MISSED_EVENTS)) &&
                netif_rx_reschedule(dev, napi))
                  goto poll_more;
      }

      return done;
}

void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
{
      struct net_device *dev = dev_ptr;
      struct ipoib_dev_priv *priv = netdev_priv(dev);

      netif_rx_schedule(dev, &priv->napi);
}

static inline int post_send(struct ipoib_dev_priv *priv,
                      unsigned int wr_id,
                      struct ib_ah *address, u32 qpn,
                      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;
      priv->tx_wr.wr.ud.remote_qpn  = qpn;
      priv->tx_wr.wr.ud.ah          = address;

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

void ipoib_send(struct net_device *dev, struct sk_buff *skb,
            struct ipoib_ah *address, u32 qpn)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ipoib_tx_buf *tx_req;
      u64 addr;

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

      ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
                   skb->len, address, qpn);

      /*
       * 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 = &priv->tx_ring[priv->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, priv->tx_head & (ipoib_sendq_size - 1),
                         address->ah, qpn, 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;

            address->last_send = priv->tx_head;
            ++priv->tx_head;

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

static void __ipoib_reap_ah(struct net_device *dev)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ipoib_ah *ah, *tah;
      LIST_HEAD(remove_list);

      spin_lock_irq(&priv->tx_lock);
      spin_lock(&priv->lock);
      list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
            if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
                  list_del(&ah->list);
                  ib_destroy_ah(ah->ah);
                  kfree(ah);
            }
      spin_unlock(&priv->lock);
      spin_unlock_irq(&priv->tx_lock);
}

void ipoib_reap_ah(struct work_struct *work)
{
      struct ipoib_dev_priv *priv =
            container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
      struct net_device *dev = priv->dev;

      __ipoib_reap_ah(dev);

      if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
            queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
                           round_jiffies_relative(HZ));
}

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

      if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
            ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
            clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
            return -1;
      }
      set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);

      ret = ipoib_init_qp(dev);
      if (ret) {
            ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
            return -1;
      }

      ret = ipoib_ib_post_receives(dev);
      if (ret) {
            ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
            ipoib_ib_dev_stop(dev, 1);
            return -1;
      }

      ret = ipoib_cm_dev_open(dev);
      if (ret) {
            ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
            ipoib_ib_dev_stop(dev, 1);
            return -1;
      }

      clear_bit(IPOIB_STOP_REAPER, &priv->flags);
      queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
                     round_jiffies_relative(HZ));

      set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);

      return 0;
}

static void ipoib_pkey_dev_check_presence(struct net_device *dev)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      u16 pkey_index = 0;

      if (ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
            clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
      else
            set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
}

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

      ipoib_pkey_dev_check_presence(dev);

      if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
            ipoib_dbg(priv, "PKEY is not assigned.\n");
            return 0;
      }

      set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);

      return ipoib_mcast_start_thread(dev);
}

int ipoib_ib_dev_down(struct net_device *dev, int flush)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);

      ipoib_dbg(priv, "downing ib_dev\n");

      clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
      netif_carrier_off(dev);

      /* Shutdown the P_Key thread if still active */
      if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
            mutex_lock(&pkey_mutex);
            set_bit(IPOIB_PKEY_STOP, &priv->flags);
            cancel_delayed_work(&priv->pkey_poll_task);
            mutex_unlock(&pkey_mutex);
            if (flush)
                  flush_workqueue(ipoib_workqueue);
      }

      ipoib_mcast_stop_thread(dev, flush);
      ipoib_mcast_dev_flush(dev);

      ipoib_flush_paths(dev);

      return 0;
}

static int recvs_pending(struct net_device *dev)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      int pending = 0;
      int i;

      for (i = 0; i < ipoib_recvq_size; ++i)
            if (priv->rx_ring[i].skb)
                  ++pending;

      return pending;
}

void ipoib_drain_cq(struct net_device *dev)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      int i, n;
      do {
            n = ib_poll_cq(priv->cq, IPOIB_NUM_WC, priv->ibwc);
            for (i = 0; i < n; ++i) {
                  /*
                   * Convert any successful completions to flush
                   * errors to avoid passing packets up the
                   * stack after bringing the device down.
                   */
                  if (priv->ibwc[i].status == IB_WC_SUCCESS)
                        priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;

                  if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
                        if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
                              ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
                        else
                              ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
                  } else {
                        if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
                              ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
                        else
                              ipoib_ib_handle_tx_wc(dev, priv->ibwc + i);
                  }
            }
      } while (n == IPOIB_NUM_WC);
}

int ipoib_ib_dev_stop(struct net_device *dev, int flush)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ib_qp_attr qp_attr;
      unsigned long begin;
      struct ipoib_tx_buf *tx_req;
      int i;

      clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);

      ipoib_cm_dev_stop(dev);

      /*
       * Move our QP to the error state and then reinitialize in
       * when all work requests have completed or have been flushed.
       */
      qp_attr.qp_state = IB_QPS_ERR;
      if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
            ipoib_warn(priv, "Failed to modify QP to ERROR state\n");

      /* Wait for all sends and receives to complete */
      begin = jiffies;

      while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
            if (time_after(jiffies, begin + 5 * HZ)) {
                  ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
                           priv->tx_head - priv->tx_tail, recvs_pending(dev));

                  /*
                   * assume the HW is wedged and just free up
                   * all our pending work requests.
                   */
                  while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
                        tx_req = &priv->tx_ring[priv->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);
                        ++priv->tx_tail;
                        --priv->tx_outstanding;
                  }

                  for (i = 0; i < ipoib_recvq_size; ++i) {
                        struct ipoib_rx_buf *rx_req;

                        rx_req = &priv->rx_ring[i];
                        if (!rx_req->skb)
                              continue;
                        ib_dma_unmap_single(priv->ca,
                                        rx_req->mapping,
                                        IPOIB_BUF_SIZE,
                                        DMA_FROM_DEVICE);
                        dev_kfree_skb_any(rx_req->skb);
                        rx_req->skb = NULL;
                  }

                  goto timeout;
            }

            ipoib_drain_cq(dev);

            msleep(1);
      }

      ipoib_dbg(priv, "All sends and receives done.\n");

timeout:
      qp_attr.qp_state = IB_QPS_RESET;
      if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
            ipoib_warn(priv, "Failed to modify QP to RESET state\n");

      /* Wait for all AHs to be reaped */
      set_bit(IPOIB_STOP_REAPER, &priv->flags);
      cancel_delayed_work(&priv->ah_reap_task);
      if (flush)
            flush_workqueue(ipoib_workqueue);

      begin = jiffies;

      while (!list_empty(&priv->dead_ahs)) {
            __ipoib_reap_ah(dev);

            if (time_after(jiffies, begin + HZ)) {
                  ipoib_warn(priv, "timing out; will leak address handles\n");
                  break;
            }

            msleep(1);
      }

      ib_req_notify_cq(priv->cq, IB_CQ_NEXT_COMP);

      return 0;
}

int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);

      priv->ca = ca;
      priv->port = port;
      priv->qp = NULL;

      if (ipoib_transport_dev_init(dev, ca)) {
            printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
            return -ENODEV;
      }

      if (dev->flags & IFF_UP) {
            if (ipoib_ib_dev_open(dev)) {
                  ipoib_transport_dev_cleanup(dev);
                  return -ENODEV;
            }
      }

      return 0;
}

static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, int pkey_event)
{
      struct ipoib_dev_priv *cpriv;
      struct net_device *dev = priv->dev;
      u16 new_index;

      mutex_lock(&priv->vlan_mutex);

      /*
       * Flush any child interfaces too -- they might be up even if
       * the parent is down.
       */
      list_for_each_entry(cpriv, &priv->child_intfs, list)
            __ipoib_ib_dev_flush(cpriv, pkey_event);

      mutex_unlock(&priv->vlan_mutex);

      if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
            ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
            return;
      }

      if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
            ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
            return;
      }

      if (pkey_event) {
            if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
                  clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
                  ipoib_ib_dev_down(dev, 0);
                  ipoib_pkey_dev_delay_open(dev);
                  return;
            }
            set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);

            /* restart QP only if P_Key index is changed */
            if (new_index == priv->pkey_index) {
                  ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
                  return;
            }
            priv->pkey_index = new_index;
      }

      ipoib_dbg(priv, "flushing\n");

      ipoib_ib_dev_down(dev, 0);

      if (pkey_event) {
            ipoib_ib_dev_stop(dev, 0);
            ipoib_ib_dev_open(dev);
      }

      /*
       * The device could have been brought down between the start and when
       * we get here, don't bring it back up if it's not configured up
       */
      if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
            ipoib_ib_dev_up(dev);
            ipoib_mcast_restart_task(&priv->restart_task);
      }
}

void ipoib_ib_dev_flush(struct work_struct *work)
{
      struct ipoib_dev_priv *priv =
            container_of(work, struct ipoib_dev_priv, flush_task);

      ipoib_dbg(priv, "Flushing %s\n", priv->dev->name);
      __ipoib_ib_dev_flush(priv, 0);
}

void ipoib_pkey_event(struct work_struct *work)
{
      struct ipoib_dev_priv *priv =
            container_of(work, struct ipoib_dev_priv, pkey_event_task);

      ipoib_dbg(priv, "Flushing %s and restarting its QP\n", priv->dev->name);
      __ipoib_ib_dev_flush(priv, 1);
}

void ipoib_ib_dev_cleanup(struct net_device *dev)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);

      ipoib_dbg(priv, "cleaning up ib_dev\n");

      ipoib_mcast_stop_thread(dev, 1);
      ipoib_mcast_dev_flush(dev);

      ipoib_transport_dev_cleanup(dev);
}

/*
 * Delayed P_Key Assigment Interim Support
 *
 * The following is initial implementation of delayed P_Key assigment
 * mechanism. It is using the same approach implemented for the multicast
 * group join. The single goal of this implementation is to quickly address
 * Bug #2507. This implementation will probably be removed when the P_Key
 * change async notification is available.
 */

void ipoib_pkey_poll(struct work_struct *work)
{
      struct ipoib_dev_priv *priv =
            container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
      struct net_device *dev = priv->dev;

      ipoib_pkey_dev_check_presence(dev);

      if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
            ipoib_open(dev);
      else {
            mutex_lock(&pkey_mutex);
            if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
                  queue_delayed_work(ipoib_workqueue,
                                 &priv->pkey_poll_task,
                                 HZ);
            mutex_unlock(&pkey_mutex);
      }
}

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

      /* Look for the interface pkey value in the IB Port P_Key table and */
      /* set the interface pkey assigment flag                            */
      ipoib_pkey_dev_check_presence(dev);

      /* P_Key value not assigned yet - start polling */
      if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
            mutex_lock(&pkey_mutex);
            clear_bit(IPOIB_PKEY_STOP, &priv->flags);
            queue_delayed_work(ipoib_workqueue,
                           &priv->pkey_poll_task,
                           HZ);
            mutex_unlock(&pkey_mutex);
            return 1;
      }

      return 0;
}

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