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authorNeal Cardwell <ncardwell@google.com>2012-02-13 20:22:08 +0000
committerDavid S. Miller <davem@davemloft.net>2012-02-14 14:38:57 -0500
commit0af2a0d0576205dda778d25c6c344fc6508fc81d (patch)
tree3f3b3d70ed8d614c2b64ddeaaac27f526e844497 /net
parentfbcf88b8833ce2c404b9a0e7caab82b20312cbbc (diff)
downloadlinux-0af2a0d0576205dda778d25c6c344fc6508fc81d.tar.bz2
tcp: fix tcp_shifted_skb() adjustment of lost_cnt_hint for FACK
This commit ensures that lost_cnt_hint is correctly updated in tcp_shifted_skb() for FACK TCP senders. The lost_cnt_hint adjustment in tcp_sacktag_one() only applies to non-FACK senders, so FACK senders need their own adjustment. This applies the spirit of 1e5289e121372a3494402b1b131b41bfe1cf9b7f - except now that the sequence range passed into tcp_sacktag_one() is correct we need only have a special case adjustment for FACK. Signed-off-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/tcp_input.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 8116d06e042c..53c8ce4046b2 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1403,6 +1403,10 @@ static int tcp_shifted_skb(struct sock *sk, struct sk_buff *skb,
BUG_ON(!pcount);
+ /* Adjust hint for FACK. Non-FACK is handled in tcp_sacktag_one(). */
+ if (tcp_is_fack(tp) && (skb == tp->lost_skb_hint))
+ tp->lost_cnt_hint += pcount;
+
TCP_SKB_CB(prev)->end_seq += shifted;
TCP_SKB_CB(skb)->seq += shifted;