This is a note to let you know that I've just added the patch titled

tcp: use current time in tcp_rcv_space_adjust()

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: tcp-use-current-time-in-tcp_rcv_space_adjust.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Thu Dec 14 11:45:40 CET 2017

From: Eric Dumazet edumazet@google.com Date: Wed, 6 Dec 2017 11:08:19 -0800 Subject: tcp: use current time in tcp_rcv_space_adjust()

From: Eric Dumazet edumazet@google.com

[ Upstream commit 8632385022f2b05a6ca0b9e0f95575865de0e2ce ]

When I switched rcv_rtt_est to high resolution timestamps, I forgot that tp->tcp_mstamp needed to be refreshed in tcp_rcv_space_adjust()

Using an old timestamp leads to autotuning lags.

Fixes: 645f4c6f2ebd ("tcp: switch rcv_rtt_est and rcvq_space to high resolution timestamps") Signed-off-by: Eric Dumazet edumazet@google.com Cc: Wei Wang weiwan@google.com Cc: Neal Cardwell ncardwell@google.com Cc: Yuchung Cheng ycheng@google.com Acked-by: Neal Cardwell ncardwell@google.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/ipv4/tcp_input.c | 1 + 1 file changed, 1 insertion(+)

--- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -592,6 +592,7 @@ void tcp_rcv_space_adjust(struct sock *s int time; int copied;

+ tcp_mstamp_refresh(tp); time = tcp_stamp_us_delta(tp->tcp_mstamp, tp->rcvq_space.time); if (time < (tp->rcv_rtt_est.rtt_us >> 3) || tp->rcv_rtt_est.rtt_us == 0) return;

Patches currently in stable-queue which might be from edumazet@google.com are

queue-4.14/tcp-add-tcp_v4_fill_cb-tcp_v4_restore_cb.patch queue-4.14/net-thunderx-fix-tcp-udp-checksum-offload-for-ipv6-pkts.patch queue-4.14/tcp-remove-buggy-call-to-tcp_v6_restore_cb.patch queue-4.14/net-packet-fix-a-race-in-packet_bind-and-packet_notifier.patch queue-4.14/tcp-use-ipcb-instead-of-tcp_skb_cb-in-inet_exact_dif_match.patch queue-4.14/net-thunderx-fix-tcp-udp-checksum-offload-for-ipv4-pkts.patch queue-4.14/packet-fix-crash-in-fanout_demux_rollover.patch queue-4.14/net-remove-hlist_nulls_add_tail_rcu.patch queue-4.14/tcp-when-scheduling-tlp-time-of-rto-should-account-for-current-ack.patch queue-4.14/tcp-dccp-block-bh-before-arming-time_wait-timer.patch queue-4.14/tcp-use-current-time-in-tcp_rcv_space_adjust.patch