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| author | Eric Dumazet <edumazet@google.com> | 2015-09-25 07:39:18 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-09-25 13:00:38 -0700 |
| commit | 6ac705b1805863b1899e85f641bb265f9e6e9d99 (patch) | |
| tree | 154c40ca207c6556ad154aeb77f8ab74ae21ac4c /net/ipv4/tcp_cong.c | |
| parent | 37bfbdda0b036a3720924e04c0171d9038159c2c (diff) | |
| download | linux-6ac705b1805863b1899e85f641bb265f9e6e9d99.tar.gz linux-6ac705b1805863b1899e85f641bb265f9e6e9d99.tar.bz2 linux-6ac705b1805863b1899e85f641bb265f9e6e9d99.zip | |
tcp: remove tcp_ecn_make_synack() socket argument
SYNACK packets might be sent without holding socket lock.
For DCTCP/ECN sake, we should call INET_ECN_xmit() while
socket lock is owned, and only when we init/change congestion control.
This also fixies a bug if congestion module is changed from
dctcp to another one on a listener : we now clear ECN bits
properly.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_cong.c')
| -rw-r--r-- | net/ipv4/tcp_cong.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c index 93c4dc3ab23f..882caa4e72bc 100644 --- a/net/ipv4/tcp_cong.c +++ b/net/ipv4/tcp_cong.c @@ -173,6 +173,10 @@ out: */ if (ca->get_info) memset(icsk->icsk_ca_priv, 0, sizeof(icsk->icsk_ca_priv)); + if (ca->flags & TCP_CONG_NEEDS_ECN) + INET_ECN_xmit(sk); + else + INET_ECN_dontxmit(sk); } void tcp_init_congestion_control(struct sock *sk) @@ -181,6 +185,10 @@ void tcp_init_congestion_control(struct sock *sk) if (icsk->icsk_ca_ops->init) icsk->icsk_ca_ops->init(sk); + if (tcp_ca_needs_ecn(sk)) + INET_ECN_xmit(sk); + else + INET_ECN_dontxmit(sk); } static void tcp_reinit_congestion_control(struct sock *sk, @@ -192,8 +200,8 @@ static void tcp_reinit_congestion_control(struct sock *sk, icsk->icsk_ca_ops = ca; icsk->icsk_ca_setsockopt = 1; - if (sk->sk_state != TCP_CLOSE && icsk->icsk_ca_ops->init) - icsk->icsk_ca_ops->init(sk); + if (sk->sk_state != TCP_CLOSE) + tcp_init_congestion_control(sk); } /* Manage refcounts on socket close. */ |