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authorEric Dumazet <edumazet@google.com>2017-04-25 20:15:32 +0300
committerDavid S. Miller <davem@davemloft.net>2017-04-26 21:44:36 +0300
commit69e996c58a35db9ca79b3f021a15bcd22202e1c0 (patch)
treeb01b75a8c41fe86ab2ce1fc88198c4f347268171 /include/linux/tcp.h
parent038a3e858de4e3ddf42c330a22b7efcddbc0a81a (diff)
downloadlinux-69e996c58a35db9ca79b3f021a15bcd22202e1c0.tar.xz
tcp: add tp->tcp_mstamp field
We want to use precise timestamps in TCP stack, but we do not want to call possibly expensive kernel time services too often. tp->tcp_mstamp is guaranteed to be updated once per incoming packet. We will use it in the following patches, removing specific skb_mstamp_get() calls, and removing ack_time from struct tcp_sacktag_state. Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/tcp.h')
-rw-r--r--include/linux/tcp.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index cbe5b602a2d3..99a22f44c32e 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -240,6 +240,7 @@ struct tcp_sock {
u32 tlp_high_seq; /* snd_nxt at the time of TLP retransmit. */
/* RTT measurement */
+ struct skb_mstamp tcp_mstamp; /* most recent packet received/sent */
u32 srtt_us; /* smoothed round trip time << 3 in usecs */
u32 mdev_us; /* medium deviation */
u32 mdev_max_us; /* maximal mdev for the last rtt period */