tcp: record pkts sent and retransmistted

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Add two stats in SCM_TIMESTAMPING_OPT_STATS:

TCP_NLA_DATA_SEGS_OUT: total data packets sent including retransmission
TCP_NLA_TOTAL_RETRANS: total data packets retransmitted

The names are picked to be consistent with corresponding fields in
TCP_INFO. This allows applications that are using the timestamping
API to measure latency stats to also retrive retransmission rate
of application write.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Yuchung Cheng 2017-01-27 16:24:38 -08:00 • committed by David S. Miller

parent f33f4ac3d3

commit 7e98102f48

2 changed files with 7 additions and 1 deletions

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2

include/uapi/linux/tcp.h

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6

net/ipv4/tcp.c

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