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authorYousuk Seung <ysseung@google.com>2020-07-31 01:44:40 +0300
committerDavid S. Miller <davem@davemloft.net>2020-08-01 03:00:44 +0300
commit48040793fa6003d211f021c6ad273477bcd90d91 (patch)
tree7a37d2d4390b9aa54bc87465b94ab358b4dedfcd /include/linux/tcp.h
parentc6886957d2d959d5217994cd08d59c816fc23e70 (diff)
downloadlinux-48040793fa6003d211f021c6ad273477bcd90d91.tar.xz
tcp: add earliest departure time to SCM_TIMESTAMPING_OPT_STATS
This change adds TCP_NLA_EDT to SCM_TIMESTAMPING_OPT_STATS that reports the earliest departure time(EDT) of the timestamped skb. By tracking EDT values of the skb from different timestamps, we can observe when and how much the value changed. This allows to measure the precise delay injected on the sender host e.g. by a bpf-base throttler. Signed-off-by: Yousuk Seung <ysseung@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/tcp.h')
-rw-r--r--include/linux/tcp.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 527d668a5275..14b62d7df942 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -484,7 +484,8 @@ static inline void tcp_saved_syn_free(struct tcp_sock *tp)
tp->saved_syn = NULL;
}
-struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk);
+struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk,
+ const struct sk_buff *orig_skb);
static inline u16 tcp_mss_clamp(const struct tcp_sock *tp, u16 mss)
{