Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 8a7f7521 authored by Michael S. Tsirkin's avatar Michael S. Tsirkin Committed by Roland Dreier
Browse files

IB/ipoib: Fix packet loss after hardware address update 



The neighbour ha field may get updated without destroying the
neighbour.  In this case, the ha field gets out of sync with the
address handle stored in ipoib_neigh->ah, with the result that
the ah field would point to an incorrect path, resulting in all
packets being lost.

Signed-off-by: default avatarMichael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent 624d01f8

drivers/infiniband/ulp/ipoib/ipoib.h

+1 −0
Original line number Diff line number Diff line
@@ -212,6 +212,7 @@ struct ipoib_path { 


struct ipoib_neigh {

	struct ipoib_ah    *ah;

	union ib_gid        dgid;

	struct sk_buff_head queue;



	struct neighbour   *neighbour;

drivers/infiniband/ulp/ipoib/ipoib_main.c

+23 −0
Original line number Diff line number Diff line
@@ -404,6 +404,8 @@ static void path_rec_completion(int status, 
		list_for_each_entry(neigh, &path->neigh_list, list) {

			kref_get(&path->ah->ref);

			neigh->ah = path->ah;

			memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,

			       sizeof(union ib_gid));



			while ((skb = __skb_dequeue(&neigh->queue)))

				__skb_queue_tail(&skqueue, skb);
@@ -510,6 +512,8 @@ static void neigh_add_path(struct sk_buff *skb, struct net_device *dev) 
	if (path->ah) {

		kref_get(&path->ah->ref);

		neigh->ah = path->ah;

		memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,

		       sizeof(union ib_gid));



		ipoib_send(dev, skb, path->ah,

			   be32_to_cpup((__be32 *) skb->dst->neighbour->ha));
@@ -633,6 +637,25 @@ static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev) 
		neigh = *to_ipoib_neigh(skb->dst->neighbour);



		if (likely(neigh->ah)) {

			if (unlikely(memcmp(&neigh->dgid.raw,

					    skb->dst->neighbour->ha + 4,

					    sizeof(union ib_gid)))) {

				spin_lock(&priv->lock);

				/*

				 * 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.

				 */

				ipoib_put_ah(neigh->ah);

				list_del(&neigh->list);

				ipoib_neigh_free(neigh);

				spin_unlock(&priv->lock);

				ipoib_path_lookup(skb, dev);

				goto out;

			}



			ipoib_send(dev, skb, neigh->ah,

				   be32_to_cpup((__be32 *) skb->dst->neighbour->ha));

			goto out;