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tcp: add tcp_wstamp_ns socket field

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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>
This commit is contained in:
Eric Dumazet 2018-09-21 08:51:49 -07:00 committed by David S. Miller
parent 142537e419
commit 9799ccb0e9
3 changed files with 19 additions and 11 deletions
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2
include/linux/tcp.h
View file

@ -248,6 +248,8 @@ struct tcp_sock {
syn_smc:1; /* SYN includes SMC */
u32 tlp_high_seq; /* snd_nxt at the time of TLP retransmit. */
u64 tcp_wstamp_ns; /* departure time for next sent data packet */
/* RTT measurement */
u64 tcp_mstamp; /* most recent packet received/sent */
u32 srtt_us; /* smoothed round trip time << 3 in usecs */

12
include/net/tcp.h
View file

@ -752,17 +752,7 @@ static inline u32 tcp_time_stamp_raw(void)
return div_u64(tcp_clock_ns(), NSEC_PER_SEC / TCP_TS_HZ);
}
/* Refresh 1us clock of a TCP socket,
* ensuring monotically increasing values.
*/
static inline void tcp_mstamp_refresh(struct tcp_sock *tp)
{
u64 val = tcp_clock_us();
if (val > tp->tcp_mstamp)
tp->tcp_mstamp = val;
}
void tcp_mstamp_refresh(struct tcp_sock *tp);
static inline u32 tcp_stamp_us_delta(u64 t1, u64 t0)
{

16
net/ipv4/tcp_output.c
View file

@ -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);