This is a note to let you know that I've just added the patch titled
virtio_net: fix error handling for mergeable buffers
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
virtio_net-fix-error-handling-for-mergeable-buffers.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Mon Jan 13 09:44:41 PST 2014
From: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Date: Thu, 26 Dec 2013 15:32:47 +0200
Subject: virtio_net: fix error handling for mergeable buffers
From: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Eric Dumazet noticed that if we encounter an error
when processing a mergeable buffer, we don't
dequeue all of the buffers from this packet,
the result is almost sure to be loss of networking.
Fix this issue.
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Michael Dalton <mwdalton@xxxxxxxxxx>
Acked-by: Michael Dalton <mwdalton@xxxxxxxxxx>
Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
(cherry picked from commit 8fc3b9e9a229778e5af3aa453c44f1a3857ba769)
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/virtio_net.c | 66 ++++++++++++++++++++++++++++++++---------------
1 file changed, 46 insertions(+), 20 deletions(-)
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -297,26 +297,33 @@ static struct sk_buff *page_to_skb(struc
return skb;
}
-static int receive_mergeable(struct receive_queue *rq, struct sk_buff *skb)
+static struct sk_buff *receive_mergeable(struct net_device *dev,
+ struct receive_queue *rq,
+ void *buf,
+ unsigned int len)
{
- struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
- struct page *page;
- int num_buf, i, len;
+ struct skb_vnet_hdr *hdr = page_address(buf);
+ int num_buf = hdr->mhdr.num_buffers;
+ struct page *page = buf;
+ struct sk_buff *skb = page_to_skb(rq, page, len);
+ int i;
+
+ if (unlikely(!skb))
+ goto err_skb;
- num_buf = hdr->mhdr.num_buffers;
while (--num_buf) {
i = skb_shinfo(skb)->nr_frags;
if (i >= MAX_SKB_FRAGS) {
pr_debug("%s: packet too long\n", skb->dev->name);
skb->dev->stats.rx_length_errors++;
- return -EINVAL;
+ return NULL;
}
page = virtqueue_get_buf(rq->vq, &len);
if (!page) {
- pr_debug("%s: rx error: %d buffers missing\n",
- skb->dev->name, hdr->mhdr.num_buffers);
- skb->dev->stats.rx_length_errors++;
- return -EINVAL;
+ pr_debug("%s: rx error: %d buffers %d missing\n",
+ dev->name, hdr->mhdr.num_buffers, num_buf);
+ dev->stats.rx_length_errors++;
+ goto err_buf;
}
if (len > PAGE_SIZE)
@@ -326,7 +333,25 @@ static int receive_mergeable(struct rece
--rq->num;
}
- return 0;
+ return skb;
+err_skb:
+ give_pages(rq, page);
+ while (--num_buf) {
+ buf = virtqueue_get_buf(rq->vq, &len);
+ if (unlikely(!buf)) {
+ pr_debug("%s: rx error: %d buffers missing\n",
+ dev->name, num_buf);
+ dev->stats.rx_length_errors++;
+ break;
+ }
+ page = buf;
+ give_pages(rq, page);
+ --rq->num;
+ }
+err_buf:
+ dev->stats.rx_dropped++;
+ dev_kfree_skb(skb);
+ return NULL;
}
static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len)
@@ -354,17 +379,18 @@ static void receive_buf(struct receive_q
skb_trim(skb, len);
} else {
page = buf;
- skb = page_to_skb(rq, page, len);
- if (unlikely(!skb)) {
- dev->stats.rx_dropped++;
- give_pages(rq, page);
- return;
- }
- if (vi->mergeable_rx_bufs)
- if (receive_mergeable(rq, skb)) {
- dev_kfree_skb(skb);
+ if (vi->mergeable_rx_bufs) {
+ skb = receive_mergeable(dev, rq, page, len);
+ if (unlikely(!skb))
+ return;
+ } else {
+ skb = page_to_skb(rq, page, len);
+ if (unlikely(!skb)) {
+ dev->stats.rx_dropped++;
+ give_pages(rq, page);
return;
}
+ }
}
hdr = skb_vnet_hdr(skb);
Patches currently in stable-queue which might be from mst@xxxxxxxxxx are
queue-3.12/macvtap-signal-truncated-packets.patch
queue-3.12/virtio_net-fix-error-handling-for-mergeable-buffers.patch
queue-3.12/tun-unbreak-truncated-packet-signalling.patch
queue-3.12/virtio-net-make-all-rx-paths-handle-errors.patch
queue-3.12/macvtap-do-not-double-count-received-packets.patch
queue-3.12/br-fix-use-of-rx_handler_data-in-code-executed-on-non-rx_handler-path.patch
queue-3.12/virtio-net-fix-refill-races-during-restore.patch
queue-3.12/virtio_net-don-t-leak-memory-or-block-when-too-many-frags.patch
queue-3.12/virtio-delete-napi-structures-from-netdev-before-releasing-memory.patch
--
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