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| author | zhenggy <zhenggy@chinatelecom.cn> | 2021-09-14 09:51:15 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-09-14 14:23:09 +0100 |
| commit | 4f884f3962767877d7aabbc1ec124d2c307a4257 (patch) | |
| tree | 9328cbbd296f3621a666798f664d1c6539e865c5 | |
| parent | 2865ba82476a6b2603db40cfc1c8c0831409fb41 (diff) | |
| download | linux-stable-4f884f3962767877d7aabbc1ec124d2c307a4257.tar.gz linux-stable-4f884f3962767877d7aabbc1ec124d2c307a4257.tar.bz2 linux-stable-4f884f3962767877d7aabbc1ec124d2c307a4257.zip | |
tcp: fix tp->undo_retrans accounting in tcp_sacktag_one()
Commit 10d3be569243 ("tcp-tso: do not split TSO packets at retransmit
time") may directly retrans a multiple segments TSO/GSO packet without
split, Since this commit, we can no longer assume that a retransmitted
packet is a single segment.
This patch fixes the tp->undo_retrans accounting in tcp_sacktag_one()
that use the actual segments(pcount) of the retransmitted packet.
Before that commit (10d3be569243), the assumption underlying the
tp->undo_retrans-- seems correct.
Fixes: 10d3be569243 ("tcp-tso: do not split TSO packets at retransmit time")
Signed-off-by: zhenggy <zhenggy@chinatelecom.cn>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/tcp_input.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 3f7bd7ae7d7a..141e85e6422b 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -1346,7 +1346,7 @@ static u8 tcp_sacktag_one(struct sock *sk, if (dup_sack && (sacked & TCPCB_RETRANS)) { if (tp->undo_marker && tp->undo_retrans > 0 && after(end_seq, tp->undo_marker)) - tp->undo_retrans--; + tp->undo_retrans = max_t(int, 0, tp->undo_retrans - pcount); if ((sacked & TCPCB_SACKED_ACKED) && before(start_seq, state->reord)) state->reord = start_seq; |