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tcp: consistently disable header prediction for mptcp

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The MPTCP receive path is hooked only into the TCP slow-path.
The DSS presence allows plain MPTCP traffic to hit that
consistently.

Since commit e1ff9e82e2 ("net: mptcp: improve fallback to TCP"),
when an MPTCP socket falls back to TCP, it can hit the TCP receive
fast-path, and delay or stop triggering the event notification.

Address the issue explicitly disabling the header prediction
for MPTCP sockets.

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/200
Fixes: e1ff9e82e2 ("net: mptcp: improve fallback to TCP")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2021-06-30 13:42:13 +02:00 committed by David S. Miller
parent ca75bcf0a8
commit 71158bb1f2
1 changed files with 4 additions and 0 deletions
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4
include/net/tcp.h
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@ -686,6 +686,10 @@ static inline u32 __tcp_set_rto(const struct tcp_sock *tp)
static inline void __tcp_fast_path_on(struct tcp_sock *tp, u32 snd_wnd)
{
/* mptcp hooks are only on the slow path */
if (sk_is_mptcp((struct sock *)tp))
return;
tp->pred_flags = htonl((tp->tcp_header_len << 26) |
ntohl(TCP_FLAG_ACK) |
snd_wnd);