ipoib_multicast.c

linux内核源码

/*
 * 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;