netdev - [PATCH net-next 10/11] tcp: move tp->rack init to tcp

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Message-Id: <20190117192342.71126-11-edumazet@google.com>
Date:   Thu, 17 Jan 2019 11:23:41 -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 10/11] tcp: move tp->rack init to tcp_disconnect()

If we make sure all listeners have proper tp->rack value,
then a clone will also inherit proper initial value.

Note that fresh sockets init tp->rack from tcp_init_sock()

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/ipv4/tcp.c           | 6 ++++++
 net/ipv4/tcp_minisocks.c | 6 ------
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 5f15fcc9612ae6b6964ca15660dbb7eb8cd71d83..2348199e6cee9b644177b1d5158680359fa2b57d 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2611,6 +2611,12 @@ int tcp_disconnect(struct sock *sk, int flags)
 	tp->last_oow_ack_time = 0;
 	/* There's a bubble in the pipe until at least the first ACK. */
 	tp->app_limited = ~0U;
+	tp->rack.mstamp = 0;
+	tp->rack.advanced = 0;
+	tp->rack.reo_wnd_steps = 1;
+	tp->rack.last_delivered = 0;
+	tp->rack.reo_wnd_persist = 0;
+	tp->rack.dsack_seen = 0;
 
 
 	/* Clean up fastopen related fields */
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 13f3c6444efa63b63fe38bf4606c91fa962ec584..27e11eb4164ca18da0e939eb928b5b2442f300dd 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -535,12 +535,6 @@ struct sock *tcp_create_openreq_child(const struct sock *sk,
 	newtp->fastopen_req = NULL;
 	newtp->fastopen_rsk = NULL;
 	newtp->syn_data_acked = 0;
-	newtp->rack.mstamp = 0;
-	newtp->rack.advanced = 0;
-	newtp->rack.reo_wnd_steps = 1;
-	newtp->rack.last_delivered = 0;
-	newtp->rack.reo_wnd_persist = 0;
-	newtp->rack.dsack_seen = 0;
 
 	__TCP_INC_STATS(sock_net(sk), TCP_MIB_PASSIVEOPENS);
 
-- 
2.20.1.321.g9e740568ce-goog