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tcp: introduce tcp_skb_timestamp_us() helper

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There are few places where TCP reads skb->skb_mstamp expecting
a value in usec unit.

skb->tstamp (aka skb->skb_mstamp) will soon store CLOCK_TAI nsec value.

Add tcp_skb_timestamp_us() to provide proper conversion when needed.

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 08:51:47 -07:00 • committed by David S. Miller
parent 72b0094f91
commit 2fd66ffba5
6 changed files with 27 additions and 18 deletions
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2
net/ipv4/tcp_ipv4.c
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@ -544,7 +544,7 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
BUG_ON(!skb);
tcp_mstamp_refresh(tp);
delta_us = (u32)(tp->tcp_mstamp - skb->skb_mstamp);
delta_us = (u32)(tp->tcp_mstamp - tcp_skb_timestamp_us(skb));
remaining = icsk->icsk_rto -
usecs_to_jiffies(delta_us);