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tcp: add tcpi_min_rtt and tcpi_notsent_bytes to tcp_info

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tcpi_min_rtt reports the minimal rtt observed by TCP stack for the flow,
in usec unit. Might be ~0U if not yet known.

tcpi_notsent_bytes reports the amount of bytes in the write queue that
were not yet sent.

This is done in a single patch to not add a temporary 32bit padding hole
in tcp_info.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2016-02-11 22:02:53 -08:00
committed by David S. Miller
parent 4cba259f19
commit cd9b266095
2 changed files with 9 additions and 0 deletions
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3
include/uapi/linux/tcp.h
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@@ -196,6 +196,9 @@ struct tcp_info {
__u64 tcpi_bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived */
__u32 tcpi_segs_out; /* RFC4898 tcpEStatsPerfSegsOut */
__u32 tcpi_segs_in; /* RFC4898 tcpEStatsPerfSegsIn */
__u32 tcpi_notsent_bytes;
__u32 tcpi_min_rtt;
};
/* for TCP_MD5SIG socket option */