netdev - [PATCH net-next 05/11] tcp: move mdev_us init to tcp

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Date:   Thu, 17 Jan 2019 11:23:36 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     "David S . Miller" <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        Neal Cardwell <ncardwell@...gle.com>,
        Yuchung Cheng <ycheng@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next 05/11] tcp: move mdev_us init to tcp_disconnect()

If we make sure a listener always has its mdev_us
field set to TCP_TIMEOUT_INIT, we do not need to rewrite
this field after a new clone is created.

tcp_disconnect() is very seldom used in real applications.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/ipv4/tcp.c           | 1 +
 net/ipv4/tcp_minisocks.c | 1 -
 2 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 9d8131f95a9732fb873c8a8b2c918657e1dade30..731b1c6e88a992e51b9e303803444dc255d888fa 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2572,6 +2572,7 @@ int tcp_disconnect(struct sock *sk, int flags)
 	sk->sk_shutdown = 0;
 	sock_reset_flag(sk, SOCK_DONE);
 	tp->srtt_us = 0;
+	tp->mdev_us = jiffies_to_usecs(TCP_TIMEOUT_INIT);
 	tp->rcv_rtt_last_tsecr = 0;
 	tp->write_seq += tp->max_window + 2;
 	if (tp->write_seq == 0)
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 977ad1c0cccad564fa111556ad0a0f3af4534381..35906b44e2cfa767f760773d0321a992114fee5b 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -479,7 +479,6 @@ struct sock *tcp_create_openreq_child(const struct sock *sk,
 
 	tcp_init_wl(newtp, treq->rcv_isn);
 
-	newtp->mdev_us = jiffies_to_usecs(TCP_TIMEOUT_INIT);
 	minmax_reset(&newtp->rtt_min, tcp_jiffies32, ~0U);
 	newicsk->icsk_ack.lrcvtime = tcp_jiffies32;
 
-- 
2.20.1.321.g9e740568ce-goog