tcp: introduce tcp_skb_timestamp_us() helper

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>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 597dbd749f05..b95aa72d8823 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1966,7 +1966,7 @@ static bool tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb,
         head = tcp_rtx_queue_head(sk);
         if (!head)
                 goto send_now;
-        age = tcp_stamp_us_delta(tp->tcp_mstamp, head->skb_mstamp);
+        age = tcp_stamp_us_delta(tp->tcp_mstamp, tcp_skb_timestamp_us(head));
         /* If next ACK is likely to come too late (half srtt), do not defer */
         if (age < (tp->srtt_us >> 4))
                 goto send_now;