diff options
| author |   Paolo Abeni <pabeni@redhat.com> | 2021-06-30 13:42:13 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2021-07-01 13:22:40 -0700 |
| commit | 71158bb1f2d2da61385c58fc1114e1a1c19984ba (patch) | |
| tree | ec837242618e860ced501bced939cc20924c4b33 /include/net/tcp.h | |
| parent | net: remove the caif_hsi driver (diff) | |
| download | linux-dev-71158bb1f2d2da61385c58fc1114e1a1c19984ba.tar.xz linux-dev-71158bb1f2d2da61385c58fc1114e1a1c19984ba.zip | |
tcp: consistently disable header prediction for mptcp
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 e1ff9e82e2ea ("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: e1ff9e82e2ea ("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>
Diffstat (limited to '')
| -rw-r--r-- | include/net/tcp.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index e668f1bf780d..17df9b047ee4 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -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); |