From a50df398cddf6b757bdbf30f5f0875982ef5c660 Mon Sep 17 00:00:00 2001 From: Yossi Etigin Date: Fri, 9 Jan 2009 14:05:11 -0800 Subject: [PATCH] IPoIB: Fix loss of connectivity after bonding failover on both sides Fix bonding failover in the case both peers failover and the gratuitous ARP is lost. In that case, the sender side will create an ipoib_neigh and issue a path request with the old GID first. When skb->dst->neighbour->ha changes due to ARP refresh, this ipoib_neigh will not be added to the path->list of the path of the new GID, because the ipoib_neigh already exists. It will not have an AH either, because of sender-side failover. Therefore, it will not get an AH when the path is resolved. The solution here is to compare GIDs in ipoib_start_xmit() even if neigh->ah is invalid. Comparing with an uninitialized value of neigh->dgid should be fine, since a spurious match is harmless (and astronomically unlikely too). Signed-off-by: Moni Shoua Signed-off-by: Yossi Etigin Signed-off-by: Roland Dreier --- drivers/infiniband/ulp/ipoib/ipoib_main.c | 38 +++++++++++------------ 1 file changed, 19 insertions(+), 19 deletions(-) diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c index 19e06bc38b39..dce0443f9d69 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c @@ -711,26 +711,26 @@ static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev) neigh = *to_ipoib_neigh(skb->dst->neighbour); - if (neigh->ah) - if (unlikely((memcmp(&neigh->dgid.raw, - skb->dst->neighbour->ha + 4, - sizeof(union ib_gid))) || - (neigh->dev != dev))) { - spin_lock_irqsave(&priv->lock, flags); - /* - * It's safe to call ipoib_put_ah() inside - * priv->lock here, because we know that - * path->ah will always hold one more reference, - * so ipoib_put_ah() will never do more than - * decrement the ref count. - */ + if (unlikely((memcmp(&neigh->dgid.raw, + skb->dst->neighbour->ha + 4, + sizeof(union ib_gid))) || + (neigh->dev != dev))) { + spin_lock_irqsave(&priv->lock, flags); + /* + * It's safe to call ipoib_put_ah() inside + * priv->lock here, because we know that + * path->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); - list_del(&neigh->list); - ipoib_neigh_free(dev, neigh); - spin_unlock_irqrestore(&priv->lock, flags); - ipoib_path_lookup(skb, dev); - return NETDEV_TX_OK; - } + list_del(&neigh->list); + ipoib_neigh_free(dev, neigh); + spin_unlock_irqrestore(&priv->lock, flags); + ipoib_path_lookup(skb, dev); + return NETDEV_TX_OK; + } if (ipoib_cm_get(neigh)) { if (ipoib_cm_up(neigh)) {