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IB/ipoib: Bound the net device to the ipoib_neigh structue

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IPoIB uses a two layer neighboring scheme, such that for each struct neighbour
whose device is an ipoib one, there is a struct ipoib_neigh buddy which is
created on demand at the tx flow by an ipoib_neigh_alloc(skb->dst->neighbour)
call.

When using the bonding driver, neighbours are created by the net stack on behalf
of the bonding (master) device. On the tx flow the bonding code gets an skb such
that skb->dev points to the master device, it changes this skb to point on the
slave device and calls the slave hard_start_xmit function.

Under this scheme, ipoib_neigh_destructor assumption that for each struct
neighbour it gets, n->dev is an ipoib device and hence netdev_priv(n->dev)
can be casted to struct ipoib_dev_priv is buggy.

To fix it, this patch adds a dev field to struct ipoib_neigh which is used
instead of the struct neighbour dev one, when n->dev->flags has the
IFF_MASTER bit set.

Signed-off-by: Moni Shoua <monis at voltaire.com>
Signed-off-by: Or Gerlitz <ogerlitz at voltaire.com>
Acked-by: Roland Dreier <rdreier@cisco.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Moni Shoua 2007-10-09 19:43:36 -07:00 committed by Jeff Garzik
parent a8a935dae5
commit 732a2170f4
3 changed files with 20 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
drivers/infiniband/ulp/ipoib/ipoib.h
View file

@ -349,6 +349,7 @@ struct ipoib_neigh {
struct sk_buff_head queue;
struct neighbour *neighbour;
struct net_device *dev;
struct list_head list;
};
@ -365,7 +366,8 @@ static inline struct ipoib_neigh **to_ipoib_neigh(struct neighbour *neigh)
INFINIBAND_ALEN, sizeof(void *));
}
struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neigh);
struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neigh,
struct net_device *dev);
void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh);
extern struct workqueue_struct *ipoib_workqueue;

24
drivers/infiniband/ulp/ipoib/ipoib_main.c
View file

@ -517,7 +517,7 @@ static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
struct ipoib_path *path;
struct ipoib_neigh *neigh;
neigh = ipoib_neigh_alloc(skb->dst->neighbour);
neigh = ipoib_neigh_alloc(skb->dst->neighbour, skb->dev);
if (!neigh) {
++dev->stats.tx_dropped;
dev_kfree_skb_any(skb);
@ -817,6 +817,13 @@ static void ipoib_neigh_cleanup(struct neighbour *n)
unsigned long flags;
struct ipoib_ah *ah = NULL;
neigh = *to_ipoib_neigh(n);
if (neigh) {
priv = netdev_priv(neigh->dev);
ipoib_dbg(priv, "neigh_destructor for bonding device: %s\n",
n->dev->name);
} else
return;
ipoib_dbg(priv,
"neigh_cleanup for %06x " IPOIB_GID_FMT "\n",
IPOIB_QPN(n->ha),
@ -824,13 +831,10 @@ static void ipoib_neigh_cleanup(struct neighbour *n)
spin_lock_irqsave(&priv->lock, flags);
neigh = *to_ipoib_neigh(n);
if (neigh) {
if (neigh->ah)
ah = neigh->ah;
list_del(&neigh->list);
ipoib_neigh_free(n->dev, neigh);
}
if (neigh->ah)
ah = neigh->ah;
list_del(&neigh->list);
ipoib_neigh_free(n->dev, neigh);
spin_unlock_irqrestore(&priv->lock, flags);
@ -838,7 +842,8 @@ static void ipoib_neigh_cleanup(struct neighbour *n)
ipoib_put_ah(ah);
}
struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour)
struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
struct net_device *dev)
{
struct ipoib_neigh *neigh;
@ -847,6 +852,7 @@ struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour)
return NULL;
neigh->neighbour = neighbour;
neigh->dev = dev;
*to_ipoib_neigh(neighbour) = neigh;
skb_queue_head_init(&neigh->queue);
ipoib_cm_set(neigh, NULL);

3
drivers/infiniband/ulp/ipoib/ipoib_multicast.c
View file

@ -705,7 +705,8 @@ out:
if (skb->dst &&
skb->dst->neighbour &&
!*to_ipoib_neigh(skb->dst->neighbour)) {
struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour);
struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour,
skb->dev);
if (neigh) {
kref_get(&mcast->ah->ref);