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ipoib_multicast.c

/*
 * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 * Copyright (c) 2004 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_multicast.c 1362 2004-12-18 15:56:29Z roland $
 */

#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/ip.h>
#include <linux/in.h>
#include <linux/igmp.h>
#include <linux/inetdevice.h>
#include <linux/delay.h>
#include <linux/completion.h>

#include <net/dst.h>

#include "ipoib.h"

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
static int mcast_debug_level;

module_param(mcast_debug_level, int, 0644);
MODULE_PARM_DESC(mcast_debug_level,
             "Enable multicast debug tracing if > 0");
#endif

static DEFINE_MUTEX(mcast_mutex);

struct ipoib_mcast_iter {
      struct net_device *dev;
      union ib_gid       mgid;
      unsigned long      created;
      unsigned int       queuelen;
      unsigned int       complete;
      unsigned int       send_only;
};

static void ipoib_mcast_free(struct ipoib_mcast *mcast)
{
      struct net_device *dev = mcast->dev;
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ipoib_neigh *neigh, *tmp;
      unsigned long flags;
      int tx_dropped = 0;

      ipoib_dbg_mcast(netdev_priv(dev),
                  "deleting multicast group " IPOIB_GID_FMT "\n",
                  IPOIB_GID_ARG(mcast->mcmember.mgid));

      spin_lock_irqsave(&priv->lock, flags);

      list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
            /*
             * It's safe to call ipoib_put_ah() inside priv->lock
             * here, because we know that mcast->ah will always
             * hold one more reference, so ipoib_put_ah() will
             * never do more than decrement the ref count.
             */
            if (neigh->ah)
                  ipoib_put_ah(neigh->ah);
            ipoib_neigh_free(dev, neigh);
      }

      spin_unlock_irqrestore(&priv->lock, flags);

      if (mcast->ah)
            ipoib_put_ah(mcast->ah);

      while (!skb_queue_empty(&mcast->pkt_queue)) {
            ++tx_dropped;
            dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
      }

      spin_lock_irqsave(&priv->tx_lock, flags);
      dev->stats.tx_dropped += tx_dropped;
      spin_unlock_irqrestore(&priv->tx_lock, flags);

      kfree(mcast);
}

static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
                                   int can_sleep)
{
      struct ipoib_mcast *mcast;

      mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
      if (!mcast)
            return NULL;

      mcast->dev = dev;
      mcast->created = jiffies;
      mcast->backoff = 1;

      INIT_LIST_HEAD(&mcast->list);
      INIT_LIST_HEAD(&mcast->neigh_list);
      skb_queue_head_init(&mcast->pkt_queue);

      return mcast;
}

static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct rb_node *n = priv->multicast_tree.rb_node;

      while (n) {
            struct ipoib_mcast *mcast;
            int ret;

            mcast = rb_entry(n, struct ipoib_mcast, rb_node);

            ret = memcmp(mgid, mcast->mcmember.mgid.raw,
                       sizeof (union ib_gid));
            if (ret < 0)
                  n = n->rb_left;
            else if (ret > 0)
                  n = n->rb_right;
            else
                  return mcast;
      }

      return NULL;
}

static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;

      while (*n) {
            struct ipoib_mcast *tmcast;
            int ret;

            pn = *n;
            tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);

            ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
                       sizeof (union ib_gid));
            if (ret < 0)
                  n = &pn->rb_left;
            else if (ret > 0)
                  n = &pn->rb_right;
            else
                  return -EEXIST;
      }

      rb_link_node(&mcast->rb_node, pn, n);
      rb_insert_color(&mcast->rb_node, &priv->multicast_tree);

      return 0;
}

static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
                           struct ib_sa_mcmember_rec *mcmember)
{
      struct net_device *dev = mcast->dev;
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ipoib_ah *ah;
      int ret;

      mcast->mcmember = *mcmember;

      /* Set the cached Q_Key before we attach if it's the broadcast group */
      if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
                sizeof (union ib_gid))) {
            priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
            priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
      }

      if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
            if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
                  ipoib_warn(priv, "multicast group " IPOIB_GID_FMT
                           " already attached\n",
                           IPOIB_GID_ARG(mcast->mcmember.mgid));

                  return 0;
            }

            ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
                               &mcast->mcmember.mgid);
            if (ret < 0) {
                  ipoib_warn(priv, "couldn't attach QP to multicast group "
                           IPOIB_GID_FMT "\n",
                           IPOIB_GID_ARG(mcast->mcmember.mgid));

                  clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
                  return ret;
            }
      }

      {
            struct ib_ah_attr av = {
                  .dlid        = be16_to_cpu(mcast->mcmember.mlid),
                  .port_num      = priv->port,
                  .sl          = mcast->mcmember.sl,
                  .ah_flags      = IB_AH_GRH,
                  .static_rate   = mcast->mcmember.rate,
                  .grh         = {
                        .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
                        .hop_limit     = mcast->mcmember.hop_limit,
                        .sgid_index    = 0,
                        .traffic_class = mcast->mcmember.traffic_class
                  }
            };
            av.grh.dgid = mcast->mcmember.mgid;

            ah = ipoib_create_ah(dev, priv->pd, &av);
            if (!ah) {
                  ipoib_warn(priv, "ib_address_create failed\n");
            } else {
                  spin_lock_irq(&priv->lock);
                  mcast->ah = ah;
                  spin_unlock_irq(&priv->lock);

                  ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT
                              " AV %p, LID 0x%04x, SL %d\n",
                              IPOIB_GID_ARG(mcast->mcmember.mgid),
                              mcast->ah->ah,
                              be16_to_cpu(mcast->mcmember.mlid),
                              mcast->mcmember.sl);
            }
      }

      /* actually send any queued packets */
      spin_lock_irq(&priv->tx_lock);
      while (!skb_queue_empty(&mcast->pkt_queue)) {
            struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
            spin_unlock_irq(&priv->tx_lock);

            skb->dev = dev;

            if (!skb->dst || !skb->dst->neighbour) {
                  /* put pseudoheader back on for next time */
                  skb_push(skb, sizeof (struct ipoib_pseudoheader));
            }

            if (dev_queue_xmit(skb))
                  ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
            spin_lock_irq(&priv->tx_lock);
      }
      spin_unlock_irq(&priv->tx_lock);

      return 0;
}

static int
ipoib_mcast_sendonly_join_complete(int status,
                           struct ib_sa_multicast *multicast)
{
      struct ipoib_mcast *mcast = multicast->context;
      struct net_device *dev = mcast->dev;
      struct ipoib_dev_priv *priv = netdev_priv(dev);

      /* We trap for port events ourselves. */
      if (status == -ENETRESET)
            return 0;

      if (!status)
            status = ipoib_mcast_join_finish(mcast, &multicast->rec);

      if (status) {
            if (mcast->logcount++ < 20)
                  ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for "
                              IPOIB_GID_FMT ", status %d\n",
                              IPOIB_GID_ARG(mcast->mcmember.mgid), status);

            /* Flush out any queued packets */
            spin_lock_irq(&priv->tx_lock);
            while (!skb_queue_empty(&mcast->pkt_queue)) {
                  ++dev->stats.tx_dropped;
                  dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
            }
            spin_unlock_irq(&priv->tx_lock);

            /* Clear the busy flag so we try again */
            status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY,
                                  &mcast->flags);
      }
      return status;
}

static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
{
      struct net_device *dev = mcast->dev;
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ib_sa_mcmember_rec rec = {
#if 0                   /* Some SMs don't support send-only yet */
            .join_state = 4
#else
            .join_state = 1
#endif
      };
      int ret = 0;

      if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
            ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
            return -ENODEV;
      }

      if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
            ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
            return -EBUSY;
      }

      rec.mgid     = mcast->mcmember.mgid;
      rec.port_gid = priv->local_gid;
      rec.pkey     = cpu_to_be16(priv->pkey);

      mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca,
                               priv->port, &rec,
                               IB_SA_MCMEMBER_REC_MGID      |
                               IB_SA_MCMEMBER_REC_PORT_GID  |
                               IB_SA_MCMEMBER_REC_PKEY      |
                               IB_SA_MCMEMBER_REC_JOIN_STATE,
                               GFP_ATOMIC,
                               ipoib_mcast_sendonly_join_complete,
                               mcast);
      if (IS_ERR(mcast->mc)) {
            ret = PTR_ERR(mcast->mc);
            clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
            ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n",
                     ret);
      } else {
            ipoib_dbg_mcast(priv, "no multicast record for " IPOIB_GID_FMT
                        ", starting join\n",
                        IPOIB_GID_ARG(mcast->mcmember.mgid));
      }

      return ret;
}

static int ipoib_mcast_join_complete(int status,
                             struct ib_sa_multicast *multicast)
{
      struct ipoib_mcast *mcast = multicast->context;
      struct net_device *dev = mcast->dev;
      struct ipoib_dev_priv *priv = netdev_priv(dev);

      ipoib_dbg_mcast(priv, "join completion for " IPOIB_GID_FMT
                  " (status %d)\n",
                  IPOIB_GID_ARG(mcast->mcmember.mgid), status);

      /* We trap for port events ourselves. */
      if (status == -ENETRESET)
            return 0;

      if (!status)
            status = ipoib_mcast_join_finish(mcast, &multicast->rec);

      if (!status) {
            mcast->backoff = 1;
            mutex_lock(&mcast_mutex);
            if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
                  queue_delayed_work(ipoib_workqueue,
                                 &priv->mcast_task, 0);
            mutex_unlock(&mcast_mutex);

            if (mcast == priv->broadcast)
                  netif_carrier_on(dev);

            return 0;
      }

      if (mcast->logcount++ < 20) {
            if (status == -ETIMEDOUT) {
                  ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT
                              ", status %d\n",
                              IPOIB_GID_ARG(mcast->mcmember.mgid),
                              status);
            } else {
                  ipoib_warn(priv, "multicast join failed for "
                           IPOIB_GID_FMT ", status %d\n",
                           IPOIB_GID_ARG(mcast->mcmember.mgid),
                           status);
            }
      }

      mcast->backoff *= 2;
      if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
            mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;

      /* Clear the busy flag so we try again */
      status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);

      mutex_lock(&mcast_mutex);
      spin_lock_irq(&priv->lock);
      if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
            queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
                           mcast->backoff * HZ);
      spin_unlock_irq(&priv->lock);
      mutex_unlock(&mcast_mutex);

      return status;
}

static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
                       int create)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ib_sa_mcmember_rec rec = {
            .join_state = 1
      };
      ib_sa_comp_mask comp_mask;
      int ret = 0;

      ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
                  IPOIB_GID_ARG(mcast->mcmember.mgid));

      rec.mgid     = mcast->mcmember.mgid;
      rec.port_gid = priv->local_gid;
      rec.pkey     = cpu_to_be16(priv->pkey);

      comp_mask =
            IB_SA_MCMEMBER_REC_MGID       |
            IB_SA_MCMEMBER_REC_PORT_GID   |
            IB_SA_MCMEMBER_REC_PKEY       |
            IB_SA_MCMEMBER_REC_JOIN_STATE;

      if (create) {
            comp_mask |=
                  IB_SA_MCMEMBER_REC_QKEY             |
                  IB_SA_MCMEMBER_REC_MTU_SELECTOR           |
                  IB_SA_MCMEMBER_REC_MTU              |
                  IB_SA_MCMEMBER_REC_TRAFFIC_CLASS    |
                  IB_SA_MCMEMBER_REC_RATE_SELECTOR    |
                  IB_SA_MCMEMBER_REC_RATE             |
                  IB_SA_MCMEMBER_REC_SL               |
                  IB_SA_MCMEMBER_REC_FLOW_LABEL       |
                  IB_SA_MCMEMBER_REC_HOP_LIMIT;

            rec.qkey      = priv->broadcast->mcmember.qkey;
            rec.mtu_selector  = IB_SA_EQ;
            rec.mtu             = priv->broadcast->mcmember.mtu;
            rec.traffic_class = priv->broadcast->mcmember.traffic_class;
            rec.rate_selector = IB_SA_EQ;
            rec.rate      = priv->broadcast->mcmember.rate;
            rec.sl              = priv->broadcast->mcmember.sl;
            rec.flow_label      = priv->broadcast->mcmember.flow_label;
            rec.hop_limit       = priv->broadcast->mcmember.hop_limit;
      }

      set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
      mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
                               &rec, comp_mask, GFP_KERNEL,
                               ipoib_mcast_join_complete, mcast);
      if (IS_ERR(mcast->mc)) {
            clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
            ret = PTR_ERR(mcast->mc);
            ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);

            mcast->backoff *= 2;
            if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
                  mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;

            mutex_lock(&mcast_mutex);
            if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
                  queue_delayed_work(ipoib_workqueue,
                                 &priv->mcast_task,
                                 mcast->backoff * HZ);
            mutex_unlock(&mcast_mutex);
      }
}

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

      if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
            return;

      if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
            ipoib_warn(priv, "ib_query_gid() failed\n");
      else
            memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));

      {
            struct ib_port_attr attr;

            if (!ib_query_port(priv->ca, priv->port, &attr))
                  priv->local_lid = attr.lid;
            else
                  ipoib_warn(priv, "ib_query_port failed\n");
      }

      if (!priv->broadcast) {
            struct ipoib_mcast *broadcast;

            broadcast = ipoib_mcast_alloc(dev, 1);
            if (!broadcast) {
                  ipoib_warn(priv, "failed to allocate broadcast group\n");
                  mutex_lock(&mcast_mutex);
                  if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
                        queue_delayed_work(ipoib_workqueue,
                                       &priv->mcast_task, HZ);
                  mutex_unlock(&mcast_mutex);
                  return;
            }

            spin_lock_irq(&priv->lock);
            memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
                   sizeof (union ib_gid));
            priv->broadcast = broadcast;

            __ipoib_mcast_add(dev, priv->broadcast);
            spin_unlock_irq(&priv->lock);
      }

      if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
            if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
                  ipoib_mcast_join(dev, priv->broadcast, 0);
            return;
      }

      while (1) {
            struct ipoib_mcast *mcast = NULL;

            spin_lock_irq(&priv->lock);
            list_for_each_entry(mcast, &priv->multicast_list, list) {
                  if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
                      && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
                      && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
                        /* Found the next unjoined group */
                        break;
                  }
            }
            spin_unlock_irq(&priv->lock);

            if (&mcast->list == &priv->multicast_list) {
                  /* All done */
                  break;
            }

            ipoib_mcast_join(dev, mcast, 1);
            return;
      }

      priv->mcast_mtu = ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu) -
            IPOIB_ENCAP_LEN;

      if (!ipoib_cm_admin_enabled(dev))
            dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);

      ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");

      clear_bit(IPOIB_MCAST_RUN, &priv->flags);
}

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

      ipoib_dbg_mcast(priv, "starting multicast thread\n");

      mutex_lock(&mcast_mutex);
      if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
            queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
      mutex_unlock(&mcast_mutex);

      spin_lock_irq(&priv->lock);
      set_bit(IPOIB_MCAST_STARTED, &priv->flags);
      spin_unlock_irq(&priv->lock);

      return 0;
}

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

      ipoib_dbg_mcast(priv, "stopping multicast thread\n");

      spin_lock_irq(&priv->lock);
      clear_bit(IPOIB_MCAST_STARTED, &priv->flags);
      spin_unlock_irq(&priv->lock);

      mutex_lock(&mcast_mutex);
      clear_bit(IPOIB_MCAST_RUN, &priv->flags);
      cancel_delayed_work(&priv->mcast_task);
      mutex_unlock(&mcast_mutex);

      if (flush)
            flush_workqueue(ipoib_workqueue);

      return 0;
}

static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      int ret = 0;

      if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
            ib_sa_free_multicast(mcast->mc);

      if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
            ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
                        IPOIB_GID_ARG(mcast->mcmember.mgid));

            /* Remove ourselves from the multicast group */
            ret = ipoib_mcast_detach(dev, be16_to_cpu(mcast->mcmember.mlid),
                               &mcast->mcmember.mgid);
            if (ret)
                  ipoib_warn(priv, "ipoib_mcast_detach failed (result = %d)\n", ret);
      }

      return 0;
}

void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ipoib_mcast *mcast;

      /*
       * We can only be called from ipoib_start_xmit, so we're
       * inside tx_lock -- no need to save/restore flags.
       */
      spin_lock(&priv->lock);

      if (!test_bit(IPOIB_MCAST_STARTED, &priv->flags)      ||
          !priv->broadcast                            ||
          !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
            ++dev->stats.tx_dropped;
            dev_kfree_skb_any(skb);
            goto unlock;
      }

      mcast = __ipoib_mcast_find(dev, mgid);
      if (!mcast) {
            /* Let's create a new send only group now */
            ipoib_dbg_mcast(priv, "setting up send only multicast group for "
                        IPOIB_GID_FMT "\n", IPOIB_GID_RAW_ARG(mgid));

            mcast = ipoib_mcast_alloc(dev, 0);
            if (!mcast) {
                  ipoib_warn(priv, "unable to allocate memory for "
                           "multicast structure\n");
                  ++dev->stats.tx_dropped;
                  dev_kfree_skb_any(skb);
                  goto out;
            }

            set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
            memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
            __ipoib_mcast_add(dev, mcast);
            list_add_tail(&mcast->list, &priv->multicast_list);
      }

      if (!mcast->ah) {
            if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
                  skb_queue_tail(&mcast->pkt_queue, skb);
            else {
                  ++dev->stats.tx_dropped;
                  dev_kfree_skb_any(skb);
            }

            if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
                  ipoib_dbg_mcast(priv, "no address vector, "
                              "but multicast join already started\n");
            else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
                  ipoib_mcast_sendonly_join(mcast);

            /*
             * If lookup completes between here and out:, don't
             * want to send packet twice.
             */
            mcast = NULL;
      }

out:
      if (mcast && mcast->ah) {
            if (skb->dst            &&
                skb->dst->neighbour &&
                !*to_ipoib_neigh(skb->dst->neighbour)) {
                  struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour,
                                                      skb->dev);

                  if (neigh) {
                        kref_get(&mcast->ah->ref);
                        neigh->ah   = mcast->ah;
                        list_add_tail(&neigh->list, &mcast->neigh_list);
                  }
            }

            ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
      }

unlock:
      spin_unlock(&priv->lock);
}

void ipoib_mcast_dev_flush(struct net_device *dev)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      LIST_HEAD(remove_list);
      struct ipoib_mcast *mcast, *tmcast;
      unsigned long flags;

      ipoib_dbg_mcast(priv, "flushing multicast list\n");

      spin_lock_irqsave(&priv->lock, flags);

      list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
            list_del(&mcast->list);
            rb_erase(&mcast->rb_node, &priv->multicast_tree);
            list_add_tail(&mcast->list, &remove_list);
      }

      if (priv->broadcast) {
            rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
            list_add_tail(&priv->broadcast->list, &remove_list);
            priv->broadcast = NULL;
      }

      spin_unlock_irqrestore(&priv->lock, flags);

      list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
            ipoib_mcast_leave(dev, mcast);
            ipoib_mcast_free(mcast);
      }
}

void ipoib_mcast_restart_task(struct work_struct *work)
{
      struct ipoib_dev_priv *priv =
            container_of(work, struct ipoib_dev_priv, restart_task);
      struct net_device *dev = priv->dev;
      struct dev_mc_list *mclist;
      struct ipoib_mcast *mcast, *tmcast;
      LIST_HEAD(remove_list);
      unsigned long flags;
      struct ib_sa_mcmember_rec rec;

      ipoib_dbg_mcast(priv, "restarting multicast task\n");

      ipoib_mcast_stop_thread(dev, 0);

      local_irq_save(flags);
      netif_tx_lock(dev);
      spin_lock(&priv->lock);

      /*
       * Unfortunately, the networking core only gives us a list of all of
       * the multicast hardware addresses. We need to figure out which ones
       * are new and which ones have been removed
       */

      /* Clear out the found flag */
      list_for_each_entry(mcast, &priv->multicast_list, list)
            clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);

      /* Mark all of the entries that are found or don't exist */
      for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
            union ib_gid mgid;

            memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);

            /* Add in the P_Key */
            mgid.raw[4] = (priv->pkey >> 8) & 0xff;
            mgid.raw[5] = priv->pkey & 0xff;

            mcast = __ipoib_mcast_find(dev, &mgid);
            if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
                  struct ipoib_mcast *nmcast;

                  /* ignore group which is directly joined by userspace */
                  if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
                      !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
                        ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid "
                                    IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
                        continue;
                  }

                  /* Not found or send-only group, let's add a new entry */
                  ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
                              IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));

                  nmcast = ipoib_mcast_alloc(dev, 0);
                  if (!nmcast) {
                        ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
                        continue;
                  }

                  set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);

                  nmcast->mcmember.mgid = mgid;

                  if (mcast) {
                        /* Destroy the send only entry */
                        list_move_tail(&mcast->list, &remove_list);

                        rb_replace_node(&mcast->rb_node,
                                    &nmcast->rb_node,
                                    &priv->multicast_tree);
                  } else
                        __ipoib_mcast_add(dev, nmcast);

                  list_add_tail(&nmcast->list, &priv->multicast_list);
            }

            if (mcast)
                  set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
      }

      /* Remove all of the entries don't exist anymore */
      list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
            if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
                !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
                  ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
                              IPOIB_GID_ARG(mcast->mcmember.mgid));

                  rb_erase(&mcast->rb_node, &priv->multicast_tree);

                  /* Move to the remove list */
                  list_move_tail(&mcast->list, &remove_list);
            }
      }

      spin_unlock(&priv->lock);
      netif_tx_unlock(dev);
      local_irq_restore(flags);

      /* We have to cancel outside of the spinlock */
      list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
            ipoib_mcast_leave(mcast->dev, mcast);
            ipoib_mcast_free(mcast);
      }

      if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
            ipoib_mcast_start_thread(dev);
}

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG

struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
{
      struct ipoib_mcast_iter *iter;

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

      iter->dev = dev;
      memset(iter->mgid.raw, 0, 16);

      if (ipoib_mcast_iter_next(iter)) {
            kfree(iter);
            return NULL;
      }

      return iter;
}

int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
{
      struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
      struct rb_node *n;
      struct ipoib_mcast *mcast;
      int ret = 1;

      spin_lock_irq(&priv->lock);

      n = rb_first(&priv->multicast_tree);

      while (n) {
            mcast = rb_entry(n, struct ipoib_mcast, rb_node);

            if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
                     sizeof (union ib_gid)) < 0) {
                  iter->mgid      = mcast->mcmember.mgid;
                  iter->created   = mcast->created;
                  iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
                  iter->complete  = !!mcast->ah;
                  iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));

                  ret = 0;

                  break;
            }

            n = rb_next(n);
      }

      spin_unlock_irq(&priv->lock);

      return ret;
}

void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
                     union ib_gid *mgid,
                     unsigned long *created,
                     unsigned int *queuelen,
                     unsigned int *complete,
                     unsigned int *send_only)
{
      *mgid      = iter->mgid;
      *created   = iter->created;
      *queuelen  = iter->queuelen;
      *complete  = iter->complete;
      *send_only = iter->send_only;
}

#endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */

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