diff options
| author | Eric Dumazet <edumazet@google.com> | 2025-02-07 15:28:29 +0000 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2025-02-11 13:08:00 +0100 |
| commit | 54a378f43425085d0684679d99735696b69165bc (patch) | |
| tree | 637db57f07abee77412a570f3e2028101c8b266c /net/ipv4/tcp_output.c | |
| parent | 48b69b4c7e5d74ad66e5214ae8cbdae0b9ea154c (diff) | |
tcp: add the ability to control max RTO
Currently, TCP stack uses a constant (120 seconds)
to limit the RTO value exponential growth.
Some applications want to set a lower value.
Add TCP_RTO_MAX_MS socket option to set a value (in ms)
between 1 and 120 seconds.
It is discouraged to change the socket rto max on a live
socket, as it might lead to unexpected disconnects.
Following patch is adding a netns sysctl to control the
default value at socket creation time.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Jason Xing <kerneljasonxing@gmail.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net/ipv4/tcp_output.c')
| -rw-r--r-- | net/ipv4/tcp_output.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 3623d19b7c6e..464232a0d637 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -4251,7 +4251,7 @@ void __tcp_send_ack(struct sock *sk, u32 rcv_nxt) unsigned long delay; delay = TCP_DELACK_MAX << icsk->icsk_ack.retry; - if (delay < TCP_RTO_MAX) + if (delay < tcp_rto_max(sk)) icsk->icsk_ack.retry++; inet_csk_schedule_ack(sk); icsk->icsk_ack.ato = TCP_ATO_MIN; @@ -4391,7 +4391,7 @@ void tcp_send_probe0(struct sock *sk) if (err <= 0) { if (icsk->icsk_backoff < READ_ONCE(net->ipv4.sysctl_tcp_retries2)) icsk->icsk_backoff++; - timeout = tcp_probe0_when(sk, TCP_RTO_MAX); + timeout = tcp_probe0_when(sk, tcp_rto_max(sk)); } else { /* If packet was not sent due to local congestion, * Let senders fight for local resources conservatively. |