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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 1e5289e121 -
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>
This commit is contained in:
Neal Cardwell 2012-02-13 20:22:08 +00:00 committed by David S. Miller
parent fbcf88b883
commit 0af2a0d057
1 changed files with 4 additions and 0 deletions
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4
net/ipv4/tcp_input.c
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@ -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;