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| author | Eric Dumazet <edumazet@google.com> | 2018-09-21 08:51:49 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-09-21 19:37:59 -0700 |
| commit | 9799ccb0e984a5c1311b22a212e7ff96e8b736de (patch) | |
| tree | 85061422e73b7f752c2e5c568ba57367e28d31a1 /net/ipv4/tcp_output.c | |
| parent | 142537e419234c396890a22806b8644dce21b132 (diff) | |
| download | linux-9799ccb0e984a5c1311b22a212e7ff96e8b736de.tar.gz linux-9799ccb0e984a5c1311b22a212e7ff96e8b736de.tar.bz2 linux-9799ccb0e984a5c1311b22a212e7ff96e8b736de.zip | |
tcp: add tcp_wstamp_ns socket field
TCP will soon provide earliest departure time on TX skbs.
It needs to track this in a new variable.
tcp_mstamp_refresh() needs to update this variable, and
became too big to stay an inline.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_output.c')
| -rw-r--r-- | net/ipv4/tcp_output.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index b95aa72d8823..5a8105e84f7c 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -45,6 +45,22 @@ #include <trace/events/tcp.h> +/* Refresh clocks of a TCP socket, + * ensuring monotically increasing values. + */ +void tcp_mstamp_refresh(struct tcp_sock *tp) +{ + u64 val = tcp_clock_ns(); + + /* departure time for next data packet */ + if (val > tp->tcp_wstamp_ns) + tp->tcp_wstamp_ns = val; + + val = div_u64(val, NSEC_PER_USEC); + if (val > tp->tcp_mstamp) + tp->tcp_mstamp = val; +} + static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle, int push_one, gfp_t gfp); |