[INFINIBAND]: Add IPoIB multicast and partition code

Add functions for handling IPoIB multicast and multiple partitions.
Signed-off-by: Roland Dreier <roland@topspin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/infiniband/ulp/ipoib/ipoib_multicast.c

+/*
+ * Copyright (c) 2004 Topspin Communications.  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 "ipoib.h"
+
+#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
+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 DECLARE_MUTEX(mcast_mutex);
+
+/* Used for all multicast joins (broadcast, IPv4 mcast and IPv6 mcast) */
+struct ipoib_mcast {
+	struct ib_sa_mcmember_rec mcmember;
+	struct ipoib_ah          *ah;
+
+	struct rb_node    rb_node;
+	struct list_head  list;
+	struct completion done;
+
+	int                 query_id;
+	struct ib_sa_query *query;
+
+	unsigned long created;
+	unsigned long backoff;
+
+	unsigned long flags;
+	unsigned char logcount;
+
+	struct list_head  neigh_list;
+
+	struct sk_buff_head pkt_queue;
+
+	struct net_device *dev;
+};
+
+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;
+
+	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) {
+		ipoib_put_ah(neigh->ah);
+		*to_ipoib_neigh(neigh->neighbour) = NULL;
+		neigh->neighbour->ops->destructor = NULL;
+		kfree(neigh);
+	}
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	if (mcast->ah)
+		ipoib_put_ah(mcast->ah);
+
+	while (!skb_queue_empty(&mcast->pkt_queue)) {
+		struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
+
+		skb->dev = dev;
+		dev_kfree_skb_any(skb);
+	}
+
+	kfree(mcast);
+}
+
+static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
+					     int can_sleep)
+{
+	struct ipoib_mcast *mcast;
+
+	mcast = kmalloc(sizeof (*mcast), can_sleep ? GFP_KERNEL : GFP_ATOMIC);
+	if (!mcast)
+		return NULL;
+
+	memset(mcast, 0, sizeof (*mcast));
+
+	init_completion(&mcast->done);
+
+	mcast->dev = dev;
+	mcast->created = jiffies;
+	mcast->backoff = HZ;
+	mcast->logcount = 0;
+
+	INIT_LIST_HEAD(&mcast->list);
+	INIT_LIST_HEAD(&mcast->neigh_list);
+	skb_queue_head_init(&mcast->pkt_queue);
+
+	mcast->ah    = NULL;
+	mcast->query = NULL;
+
+	return mcast;
+}
+
+static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, union ib_gid *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->raw, 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);
+	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);
+
+	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;
+		}
+	}
+
+	{
+		/*
+		 * For now we set static_rate to 0.  This is not
+		 * really correct: we should look at the rate
+		 * component of the MC member record, compare it with
+		 * the rate of our local port (calculated from the
+		 * active link speed and link width) and set an
+		 * inter-packet delay appropriately.
+		 */
+		struct ib_ah_attr av = {
+			.dlid	       = be16_to_cpu(mcast->mcmember.mlid),
+			.port_num      = priv->port,
+			.sl	       = mcast->mcmember.sl,
+			.static_rate   = 0,
+			.ah_flags      = IB_AH_GRH,
+			.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;
+
+		mcast->ah = ipoib_create_ah(dev, priv->pd, &av);
+		if (!mcast->ah) {
+			ipoib_warn(priv, "ib_address_create failed\n");
+		} else {
+			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 */
+	while (!skb_queue_empty(&mcast->pkt_queue)) {
+		struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
+
+		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");
+	}
+
+	return 0;
+}
+
+static void
+ipoib_mcast_sendonly_join_complete(int status,
+				   struct ib_sa_mcmember_rec *mcmember,
+				   void *mcast_ptr)
+{
+	struct ipoib_mcast *mcast = mcast_ptr;
+	struct net_device *dev = mcast->dev;
+
+	if (!status)
+		ipoib_mcast_join_finish(mcast, mcmember);
+	else {
+		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 */
+		while (!skb_queue_empty(&mcast->pkt_queue)) {
+			struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
+
+			skb->dev = dev;
+
+			dev_kfree_skb_any(skb);
+		}
+
+		/* Clear the busy flag so we try again */
+		clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
+	}
+
+	complete(&mcast->done);
+}
+
+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     = be16_to_cpu(priv->pkey);
+
+	ret = ib_sa_mcmember_rec_set(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,
+				     1000, GFP_ATOMIC,
+				     ipoib_mcast_sendonly_join_complete,
+				     mcast, &mcast->query);
+	if (ret < 0) {
+		ipoib_warn(priv, "ib_sa_mcmember_rec_set 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));
+
+		mcast->query_id = ret;
+	}
+
+	return ret;
+}
+
+static void ipoib_mcast_join_complete(int status,
+				      struct ib_sa_mcmember_rec *mcmember,
+				      void *mcast_ptr)
+{
+	struct ipoib_mcast *mcast = mcast_ptr;
+	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);
+
+	if (!status && !ipoib_mcast_join_finish(mcast, mcmember)) {
+		mcast->backoff = HZ;
+		down(&mcast_mutex);
+		if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
+			queue_work(ipoib_workqueue, &priv->mcast_task);
+		up(&mcast_mutex);
+		complete(&mcast->done);
+		return;
+	}
+
+	if (status == -EINTR) {
+		complete(&mcast->done);
+		return;
+	}
+
+	if (status && mcast->logcount++ < 20) {
+		if (status == -ETIMEDOUT || status == -EINTR) {
+			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;
+
+	mcast->query = NULL;
+
+	down(&mcast_mutex);
+	if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) {
+		if (status == -ETIMEDOUT)
+			queue_work(ipoib_workqueue, &priv->mcast_task);
+		else
+			queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
+					   mcast->backoff * HZ);
+	} else
+		complete(&mcast->done);
+	up(&mcast_mutex);
+
+	return;
+}
+
+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     = be16_to_cpu(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_SL		|
+			IB_SA_MCMEMBER_REC_FLOW_LABEL	|
+			IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
+
+		rec.qkey	  = priv->broadcast->mcmember.qkey;
+		rec.sl		  = priv->broadcast->mcmember.sl;
+		rec.flow_label	  = priv->broadcast->mcmember.flow_label;
+		rec.traffic_class = priv->broadcast->mcmember.traffic_class;
+	}
+
+	ret = ib_sa_mcmember_rec_set(priv->ca, priv->port, &rec, comp_mask,
+				     mcast->backoff * 1000, GFP_ATOMIC,
+				     ipoib_mcast_join_complete,
+				     mcast, &mcast->query);
+
+	if (ret < 0) {
+		ipoib_warn(priv, "ib_sa_mcmember_rec_set failed, status %d\n", ret);
+
+		mcast->backoff *= 2;
+		if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
+			mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
+
+		down(&mcast_mutex);
+		if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
+			queue_delayed_work(ipoib_workqueue,
+					   &priv->mcast_task,
+					   mcast->backoff);
+		up(&mcast_mutex);
+	} else
+		mcast->query_id = ret;
+}
+
+void ipoib_mcast_join_task(void *dev_ptr)
+{
+	struct net_device *dev = dev_ptr;
+	struct ipoib_dev_priv *priv = netdev_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_gid_entry_get() failed\n");
+	else
+		memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
+
+	if (!priv->broadcast) {
+		priv->broadcast = ipoib_mcast_alloc(dev, 1);
+		if (!priv->broadcast) {
+			ipoib_warn(priv, "failed to allocate broadcast group\n");
+			down(&mcast_mutex);
+			if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
+				queue_delayed_work(ipoib_workqueue,
+						   &priv->mcast_task, HZ);
+			up(&mcast_mutex);
+			return;
+		}
+
+		memcpy(priv->broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
+		       sizeof (union ib_gid));
+
+		spin_lock_irq(&priv->lock);
+		__ipoib_mcast_add(dev, priv->broadcast);
+		spin_unlock_irq(&priv->lock);
+	}
+
+	if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &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;
+	}
+
+	{
+		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");
+	}
+
+	priv->mcast_mtu = ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu) -
+		IPOIB_ENCAP_LEN;
+	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);
+	netif_carrier_on(dev);
+}
+
+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");
+
+	down(&mcast_mutex);
+	if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
+		queue_work(ipoib_workqueue, &priv->mcast_task);
+	up(&mcast_mutex);
+
+	return 0;
+}
+
+int ipoib_mcast_stop_thread(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	struct ipoib_mcast *mcast;
+
+	ipoib_dbg_mcast(priv, "stopping multicast thread\n");
+
+	down(&mcast_mutex);
+	clear_bit(IPOIB_MCAST_RUN, &priv->flags);
+	cancel_delayed_work(&priv->mcast_task);
+	up(&mcast_mutex);
+
+	flush_workqueue(ipoib_workqueue);
+
+	if (priv->broadcast && priv->broadcast->query) {
+		ib_sa_cancel_query(priv->broadcast->query_id, priv->broadcast->query);
+		priv->broadcast->query = NULL;
+		ipoib_dbg_mcast(priv, "waiting for bcast\n");
+		wait_for_completion(&priv->broadcast->done);
+	}
+
+	list_for_each_entry(mcast, &priv->multicast_list, list) {
+		if (mcast->query) {
+			ib_sa_cancel_query(mcast->query_id, mcast->query);
+			mcast->query = NULL;
+			ipoib_dbg_mcast(priv, "waiting for MGID " IPOIB_GID_FMT "\n",
+					IPOIB_GID_ARG(mcast->mcmember.mgid));
+			wait_for_completion(&mcast->done);
+		}
+	}
+
+	return 0;
+}
+
+int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	struct ib_sa_mcmember_rec rec = {
+		.join_state = 1
+	};
+	int ret = 0;
+
+	if (!test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags))
+		return 0;
+
+	ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
+			IPOIB_GID_ARG(mcast->mcmember.mgid));
+
+	rec.mgid     = mcast->mcmember.mgid;
+	rec.port_gid = priv->local_gid;
+	rec.pkey     = be16_to_cpu(priv->pkey);
+
+	/* 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);
+
+	/*
+	 * Just make one shot at leaving and don't wait for a reply;
+	 * if we fail, too bad.
+	 */
+	ret = ib_sa_mcmember_rec_delete(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,
+					0, GFP_ATOMIC, NULL,
+					mcast, &mcast->query);
+	if (ret < 0)
+		ipoib_warn(priv, "ib_sa_mcmember_rec_delete failed "
+			   "for leave (result = %d)\n", ret);
+
+	return 0;
+}
+
+void ipoib_mcast_send(struct net_device *dev, union ib_gid *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);
+
+	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_ARG(*mgid));
+
+		mcast = ipoib_mcast_alloc(dev, 0);
+		if (!mcast) {
+			ipoib_warn(priv, "unable to allocate memory for "
+				   "multicast structure\n");
+			dev_kfree_skb_any(skb);
+			goto out;
+		}
+
+		set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
+		mcast->mcmember.mgid = *mgid;
+		__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_kfree_skb_any(skb);
+
+		if (mcast->query)
+			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 = kmalloc(sizeof *neigh, GFP_ATOMIC);
+
+			if (neigh) {
+				kref_get(&mcast->ah->ref);
+				neigh->ah  	= mcast->ah;
+				neigh->neighbour = skb->dst->neighbour;
+				*to_ipoib_neigh(skb->dst->neighbour) = neigh;
+				list_add_tail(&neigh->list, &mcast->neigh_list);
+			}
+		}
+
+		ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
+	}
+
+	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, *nmcast;
+	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) {
+		nmcast = ipoib_mcast_alloc(dev, 0);
+		if (nmcast) {
+			nmcast->flags =
+				mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY);
+
+			nmcast->mcmember.mgid = mcast->mcmember.mgid;
+
+			/* Add the new group in before the to-be-destroyed group */
+			list_add_tail(&nmcast->list, &mcast->list);
+			list_del_init(&mcast->list);
+
+			rb_replace_node(&mcast->rb_node, &nmcast->rb_node,
+					&priv->multicast_tree);
+
+			list_add_tail(&mcast->list, &remove_list);
+		} else {
+			ipoib_warn(priv, "could not reallocate multicast group "
+				   IPOIB_GID_FMT "\n",
+				   IPOIB_GID_ARG(mcast->mcmember.mgid));
+		}
+	}
+
+	if (priv->broadcast) {
+		nmcast = ipoib_mcast_alloc(dev, 0);
+		if (nmcast) {
+			nmcast->mcmember.mgid = priv->broadcast->mcmember.mgid;
+
+			rb_replace_node(&priv->broadcast->rb_node,
+					&nmcast->rb_node,
+					&priv->multicast_tree);
+
+			list_add_tail(&priv->broadcast->list, &remove_list);
+		}
+
+		priv->broadcast = nmcast;
+	}
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	list_for_each_entry(mcast, &remove_list, list) {
+		ipoib_mcast_leave(dev, mcast);
+		ipoib_mcast_free(mcast);
+	}
+}
+
+void ipoib_mcast_dev_down(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	unsigned long flags;
+
+	/* Delete broadcast since it will be recreated */
+	if (priv->broadcast) {
+		ipoib_dbg_mcast(priv, "deleting broadcast group\n");
+
+		spin_lock_irqsave(&priv->lock, flags);
+		rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
+		spin_unlock_irqrestore(&priv->lock, flags);
+		ipoib_mcast_leave(dev, priv->broadcast);
+		ipoib_mcast_free(priv->broadcast);
+		priv->broadcast = NULL;
+	}
+}
+
+void ipoib_mcast_restart_task(void *dev_ptr)
+{
+	struct net_device *dev = dev_ptr;
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	struct dev_mc_list *mclist;
+	struct ipoib_mcast *mcast, *tmcast;
+	LIST_HEAD(remove_list);
+	unsigned long flags;
+
+	ipoib_dbg_mcast(priv, "restarting multicast task\n");
+
+	ipoib_mcast_stop_thread(dev);
+
+	spin_lock_irqsave(&priv->lock, flags);
+
+	/*
+	 * 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;
+
+			/* 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_del(&mcast->list);
+				list_add_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_del(&mcast->list);
+			list_add_tail(&mcast->list, &remove_list);
+		}
+	}
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	/* We have to cancel outside of the spinlock */
+	list_for_each_entry(mcast, &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);
+}
+
+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, sizeof iter->mgid);
+
+	if (ipoib_mcast_iter_next(iter)) {
+		ipoib_mcast_iter_free(iter);
+		return NULL;
+	}
+
+	return iter;
+}
+
+void ipoib_mcast_iter_free(struct ipoib_mcast_iter *iter)
+{
+	kfree(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;
+}

drivers/infiniband/ulp/ipoib/ipoib_vlan.c

+/*
+ * Copyright (c) 2004 Topspin Communications.  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_vlan.c 1349 2004-12-16 21:09:43Z roland $
+ */
+
+#include <linux/version.h>
+#include <linux/module.h>
+
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+
+#include <asm/uaccess.h>
+
+#include "ipoib.h"
+
+static ssize_t show_parent(struct class_device *class_dev, char *buf)
+{
+	struct net_device *dev =
+		container_of(class_dev, struct net_device, class_dev);
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+
+	return sprintf(buf, "%s\n", priv->parent->name);
+}
+static CLASS_DEVICE_ATTR(parent, S_IRUGO, show_parent, NULL);
+
+int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
+{
+	struct ipoib_dev_priv *ppriv, *priv;
+	char intf_name[IFNAMSIZ];
+	int result;
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	ppriv = netdev_priv(pdev);
+
+	down(&ppriv->vlan_mutex);
+
+	/*
+	 * First ensure this isn't a duplicate. We check the parent device and
+	 * then all of the child interfaces to make sure the Pkey doesn't match.
+	 */
+	if (ppriv->pkey == pkey) {
+		result = -ENOTUNIQ;
+		goto err;
+	}
+
+	list_for_each_entry(priv, &ppriv->child_intfs, list) {
+		if (priv->pkey == pkey) {
+			result = -ENOTUNIQ;
+			goto err;
+		}
+	}
+
+	snprintf(intf_name, sizeof intf_name, "%s.%04x",
+		 ppriv->dev->name, pkey);
+	priv = ipoib_intf_alloc(intf_name);
+	if (!priv) {
+		result = -ENOMEM;
+		goto err;
+	}
+
+	set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
+
+	priv->pkey = pkey;
+
+	memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, INFINIBAND_ALEN);
+	priv->dev->broadcast[8] = pkey >> 8;
+	priv->dev->broadcast[9] = pkey & 0xff;
+
+	result = ipoib_dev_init(priv->dev, ppriv->ca, ppriv->port);
+	if (result < 0) {
+		ipoib_warn(ppriv, "failed to initialize subinterface: "
+			   "device %s, port %d",
+			   ppriv->ca->name, ppriv->port);
+		goto device_init_failed;
+	}
+
+	result = register_netdev(priv->dev);
+	if (result) {
+		ipoib_warn(priv, "failed to initialize; error %i", result);
+		goto register_failed;
+	}
+
+	priv->parent = ppriv->dev;
+
+	if (ipoib_create_debug_file(priv->dev))
+		goto debug_failed;
+
+	if (ipoib_add_pkey_attr(priv->dev))
+		goto sysfs_failed;
+
+	if (class_device_create_file(&priv->dev->class_dev,
+				     &class_device_attr_parent))
+		goto sysfs_failed;
+
+	list_add_tail(&priv->list, &ppriv->child_intfs);
+
+	up(&ppriv->vlan_mutex);
+
+	return 0;
+
+sysfs_failed:
+	ipoib_delete_debug_file(priv->dev);
+
+debug_failed:
+	unregister_netdev(priv->dev);
+
+register_failed:
+	ipoib_dev_cleanup(priv->dev);
+
+device_init_failed:
+	free_netdev(priv->dev);
+
+err:
+	up(&ppriv->vlan_mutex);
+	return result;
+}
+
+int ipoib_vlan_delete(struct net_device *pdev, unsigned short pkey)
+{
+	struct ipoib_dev_priv *ppriv, *priv, *tpriv;
+	int ret = -ENOENT;
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	ppriv = netdev_priv(pdev);
+
+	down(&ppriv->vlan_mutex);
+	list_for_each_entry_safe(priv, tpriv, &ppriv->child_intfs, list) {
+		if (priv->pkey == pkey) {
+			unregister_netdev(priv->dev);
+			ipoib_dev_cleanup(priv->dev);
+
+			list_del(&priv->list);
+
+			kfree(priv);
+
+			ret = 0;
+			break;
+		}
+	}
+	up(&ppriv->vlan_mutex);
+
+	return ret;
+}