diff options
| author | Eric Dumazet <edumazet@google.com> | 2014-10-30 20:32:34 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-10-31 02:58:30 +0300 |
| commit | 39bb5e62867de82b269b07df900165029b928359 (patch) | |
| tree | f0cbefb0eee4eda2697c4e2fd6e0ad3ee7331f43 /include/linux | |
| parent | 14051f0452a2c26a3f4791e6ad6a435e8f1945ff (diff) | |
| download | linux-39bb5e62867de82b269b07df900165029b928359.tar.xz | |
net: skb_fclone_busy() needs to detect orphaned skb
Some drivers are unable to perform TX completions in a bound time.
They instead call skb_orphan()
Problem is skb_fclone_busy() has to detect this case, otherwise
we block TCP retransmits and can freeze unlucky tcp sessions on
mostly idle hosts.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Fixes: 1f3279ae0c13 ("tcp: avoid retransmits of TCP packets hanging in host queues")
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/skbuff.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 5884f95ff0e9..6c8b6f604e76 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -799,15 +799,19 @@ struct sk_buff_fclones { * @skb: buffer * * Returns true is skb is a fast clone, and its clone is not freed. + * Some drivers call skb_orphan() in their ndo_start_xmit(), + * so we also check that this didnt happen. */ -static inline bool skb_fclone_busy(const struct sk_buff *skb) +static inline bool skb_fclone_busy(const struct sock *sk, + const struct sk_buff *skb) { const struct sk_buff_fclones *fclones; fclones = container_of(skb, struct sk_buff_fclones, skb1); return skb->fclone == SKB_FCLONE_ORIG && - fclones->skb2.fclone == SKB_FCLONE_CLONE; + fclones->skb2.fclone == SKB_FCLONE_CLONE && + fclones->skb2.sk == sk; } static inline struct sk_buff *alloc_skb_fclone(unsigned int size, |