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authorEric Dumazet <edumazet@google.com>2018-09-21 18:51:47 +0300
committerDavid S. Miller <davem@davemloft.net>2018-09-22 05:37:59 +0300
commit2fd66ffba50716fc5ab481c48db643af3bda2276 (patch)
tree0429f0bb89fa036d79e9b9d2105f89c0a3e38ca0 /include
parent72b0094f918294e6cb8cf5c3b4520d928fbb1a57 (diff)
downloadlinux-2fd66ffba50716fc5ab481c48db643af3bda2276.tar.xz
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>
Diffstat (limited to 'include')
-rw-r--r--include/net/tcp.h8
1 files changed, 7 insertions, 1 deletions
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;
}