tcp: add tp->tcp_mstamp field

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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>

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Eric Dumazet 2017-04-25 10:15:32 -07:00 • committed by David S. Miller

parent 038a3e858d

commit 69e996c58a

2 changed files with 4 additions and 0 deletions

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1

include/linux/tcp.h

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3

net/ipv4/tcp_input.c

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