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tcp: provide earliest departure time in skb->tstamp

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Switch internal TCP skb->skb_mstamp to skb->skb_mstamp_ns,
from usec units to nsec units.

Do not clear skb->tstamp before entering IP stacks in TX,
so that qdisc or devices can implement pacing based on the
earliest departure time instead of socket sk->sk_pacing_rate

Packets are fed with tcp_wstamp_ns, and following patch
will update tcp_wstamp_ns when both TCP and sch_fq switch to
the earliest departure time mechanism.

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 08:51:50 -07:00
committed by David S. Miller
parent 9799ccb0e9
commit d3edd06ea8
6 changed files with 13 additions and 14 deletions
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2
net/ipv4/syncookies.c
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@@ -88,7 +88,7 @@ u64 cookie_init_timestamp(struct request_sock *req)
ts <<= TSBITS;
ts |= options;
}
return (u64)ts * (USEC_PER_SEC / TCP_TS_HZ);
return (u64)ts * (NSEC_PER_SEC / TCP_TS_HZ);
}