From 2fd66ffba50716fc5ab481c48db643af3bda2276 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Fri, 21 Sep 2018 08:51:47 -0700 Subject: 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 Signed-off-by: David S. Miller --- include/net/tcp.h | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'include') diff --git a/include/net/tcp.h b/include/net/tcp.h index c6f0bc1dc678..0ca5ea10dc06 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -774,6 +774,12 @@ static inline u32 tcp_skb_timestamp(const struct sk_buff *skb) return div_u64(skb->skb_mstamp, USEC_PER_SEC / TCP_TS_HZ); } +/* provide the departure time in us unit */ +static inline u64 tcp_skb_timestamp_us(const struct sk_buff *skb) +{ + return skb->skb_mstamp; +} + #define tcp_flag_byte(th) (((u_int8_t *)th)[13]) @@ -1940,7 +1946,7 @@ static inline s64 tcp_rto_delta_us(const struct sock *sk) { const struct sk_buff *skb = tcp_rtx_queue_head(sk); u32 rto = inet_csk(sk)->icsk_rto; - u64 rto_time_stamp_us = skb->skb_mstamp + jiffies_to_usecs(rto); + u64 rto_time_stamp_us = tcp_skb_timestamp_us(skb) + jiffies_to_usecs(rto); return rto_time_stamp_us - tcp_sk(sk)->tcp_mstamp; } -- cgit v1.2.3-71-gd317