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Commit 0af2a0d0 authored by Neal Cardwell's avatar Neal Cardwell Committed by David S. Miller
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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 1e5289e1 -
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: default avatarNeal Cardwell <ncardwell@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent fbcf88b8

net/ipv4/tcp_input.c

+4 −0
Original line number Diff line number Diff line
@@ -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;