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| author | Wei Wang | 2017-05-05 21:53:23 +0200 |
|---|---|---|
| committer | David S. Miller | 2017-05-08 20:37:07 +0200 |
| commit | 1b1fc3fddabfb8739ef2c8f04e05a9858b42c1f7 (patch) | |
| tree | 96e7fc35b0e4ab664d4e68a0ed7a68398402090c /include/net/tcp.h | |
| parent | ipv4: restore rt->fi for reference counting (diff) | |
| download | kernel-qcow2-linux-1b1fc3fddabfb8739ef2c8f04e05a9858b42c1f7.tar.gz kernel-qcow2-linux-1b1fc3fddabfb8739ef2c8f04e05a9858b42c1f7.tar.xz kernel-qcow2-linux-1b1fc3fddabfb8739ef2c8f04e05a9858b42c1f7.zip | |
tcp: make congestion control optionally skip slow start after idle
Congestion control modules that want full control over congestion
control behavior do not want the cwnd modifications controlled by
the sysctl_tcp_slow_start_after_idle code path.
So skip those code paths for CC modules that use the cong_control()
API.
As an example, those cwnd effects are not desired for the BBR congestion
control algorithm.
Fixes: c0402760f565 ("tcp: new CC hook to set sending rate with rate_sample in any CA state")
Signed-off-by: Wei Wang <weiwan@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/tcp.h')
| -rw-r--r-- | include/net/tcp.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 8c0e5a901d64..38a7427ae902 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -1234,10 +1234,12 @@ void tcp_cwnd_restart(struct sock *sk, s32 delta); static inline void tcp_slow_start_after_idle_check(struct sock *sk) { + const struct tcp_congestion_ops *ca_ops = inet_csk(sk)->icsk_ca_ops; struct tcp_sock *tp = tcp_sk(sk); s32 delta; - if (!sysctl_tcp_slow_start_after_idle || tp->packets_out) + if (!sysctl_tcp_slow_start_after_idle || tp->packets_out || + ca_ops->cong_control) return; delta = tcp_time_stamp - tp->lsndtime; if (delta > inet_csk(sk)->icsk_rto) |