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tuntap: orphan frags before trying to set tx timestamp

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sock_tx_timestamp() will clear all zerocopy flags of skb which may lead the
frags never to be orphaned. This will break guest to guest traffic when zerocopy
is enabled. Fix this by orphaning the frags before trying to set tx time stamp.

The issue were introduced by commit eda297729171fe16bf34fe5b0419dfb69060f623
(tun: Support software transmit time stamping).

Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang 2013-09-05 17:54:00 +08:00 committed by David S. Miller
parent 4bfb0513ff
commit 7bf6630523
1 changed files with 5 additions and 3 deletions
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8
drivers/net/tun.c
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@ -749,15 +749,17 @@ static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
>= dev->tx_queue_len / tun->numqueues)
goto drop;
if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
goto drop;
if (skb->sk) {
sock_tx_timestamp(skb->sk, &skb_shinfo(skb)->tx_flags);
sw_tx_timestamp(skb);
}
/* Orphan the skb - required as we might hang on to it
* for indefinite time. */
if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
goto drop;
* for indefinite time.
*/
skb_orphan(skb);
nf_reset(skb);