tcp: Remove redundant init for req->num_timeout.

Commit 5903123f662e ("tcp: Use BPF timeout setting for SYN ACK
RTO") introduced req->timeout and initialised it in 3 places:

  1. reqsk_alloc() sets 0
  2. inet_reqsk_alloc() sets TCP_TIMEOUT_INIT
  3. tcp_conn_request() sets tcp_timeout_init()

1. has been always redundant as 2. overwrites it immediately.

2. was necessary for TFO SYN+ACK but is no longer needed after
commit 8ea731d4c2ce ("tcp: Make SYN ACK RTO tunable by BPF
programs with TFO").

3. was moved to reqsk_queue_hash_req() in the previous patch.

Now, we always initialise req->timeout just before scheduling
the SYN+ACK timer:

  * For non-TFO SYN+ACK : reqsk_queue_hash_req()
  * For TFO SYN+ACK     : tcp_fastopen_create_child()

Let's remove the redundant initialisation of req->timeout in
reqsk_alloc() and inet_reqsk_alloc().

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20251106003357.273403-4-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index d9c674403eb033e0f016b073c2d76f0e5894cbad..2bfe7af51bbb173b332227d7a02486dec00b3311 100644 (file)
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -885,7 +885,6 @@ reqsk_alloc_noprof(const struct request_sock_ops *ops, struct sock *sk_listener,
        sk_tx_queue_clear(req_to_sk(req));
        req->saved_syn = NULL;
        req->syncookie = 0;
-       req->timeout = 0;
        req->num_timeout = 0;
        req->num_retrans = 0;
        req->sk = NULL;
@@ -913,7 +912,6 @@ struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
                ireq->ireq_state = TCP_NEW_SYN_RECV;
                write_pnet(&ireq->ireq_net, sock_net(sk_listener));
                ireq->ireq_family = sk_listener->sk_family;
-               req->timeout = TCP_TIMEOUT_INIT;
        }
 
        return req;