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| author | Yuchung Cheng <ycheng@google.com> | 2017-08-01 13:22:32 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-12 19:34:26 -0700 |
| commit | 4fe3624211f7860b5d7b83fa04d71e85755a9244 (patch) | |
| tree | 6479a7587c030e782c66d1f59590adc273c465be | |
| parent | 5028e6c9c5cea3b2be222f28ab1d11d932bc6e81 (diff) | |
| download | linux-yocto-4.12-4fe3624211f7860b5d7b83fa04d71e85755a9244.tar.gz linux-yocto-4.12-4fe3624211f7860b5d7b83fa04d71e85755a9244.tar.bz2 linux-yocto-4.12-4fe3624211f7860b5d7b83fa04d71e85755a9244.zip | |
tcp: avoid setting cwnd to invalid ssthresh after cwnd reduction states
[ Upstream commit ed254971edea92c3ac5c67c6a05247a92aa6075e ]
If the sender switches the congestion control during ECN-triggered
cwnd-reduction state (CA_CWR), upon exiting recovery cwnd is set to
the ssthresh value calculated by the previous congestion control. If
the previous congestion control is BBR that always keep ssthresh
to TCP_INIFINITE_SSTHRESH, cwnd ends up being infinite. The safe
step is to avoid assigning invalid ssthresh value when recovery ends.
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/ipv4/tcp_input.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 174d4376baa5..57bcae81fe42 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -2517,8 +2517,8 @@ static inline void tcp_end_cwnd_reduction(struct sock *sk) return; /* Reset cwnd to ssthresh in CWR or Recovery (unless it's undone) */ - if (inet_csk(sk)->icsk_ca_state == TCP_CA_CWR || - (tp->undo_marker && tp->snd_ssthresh < TCP_INFINITE_SSTHRESH)) { + if (tp->snd_ssthresh < TCP_INFINITE_SSTHRESH && + (inet_csk(sk)->icsk_ca_state == TCP_CA_CWR || tp->undo_marker)) { tp->snd_cwnd = tp->snd_ssthresh; tp->snd_cwnd_stamp = tcp_time_stamp; } |