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tcp: add data bytes retransmitted stats

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Introduce a new TCP stat to record the number of bytes retransmitted
(RFC4898 tcpEStatsPerfOctetsRetrans) and expose it in both tcp_info
(TCP_INFO) and opt_stats (SOF_TIMESTAMPING_OPT_STATS).

Signed-off-by: Wei Wang <weiwan@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>
This commit is contained in:
Wei Wang
2018-07-31 17:46:22 -07:00
committed by David S. Miller
parent ba113c3aa7
commit fb31c9b9f6
4 changed files with 11 additions and 0 deletions
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3
include/linux/tcp.h
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@@ -333,6 +333,9 @@ struct tcp_sock {
* the first SYN. */
u32 undo_marker; /* snd_una upon a new recovery episode. */
int undo_retrans; /* number of undoable retransmissions. */
u64 bytes_retrans; /* RFC4898 tcpEStatsPerfOctetsRetrans
* Total data bytes retransmitted
*/
u32 total_retrans; /* Total retransmits for entire connection */
u32 urg_seq; /* Seq of received urgent pointer */