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tcp: add rcv_wnd and plb_rehash to TCP_INFO

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rcv_wnd can be useful to diagnose TCP performance where receiver window
becomes the bottleneck. rehash reports the PLB and timeout triggered
rehash attempts by the TCP connection.

Signed-off-by: Mubashir Adnan Qureshi <mubashirq@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Juhyung Park <qkrwngud825@gmail.com>
This commit is contained in:
Mubashir Adnan Qureshi 2022-10-26 13:51:15 +00:00 committed by Ksawlii
parent c8a587ff65
commit a00aad3a04
2 changed files with 7 additions and 0 deletions
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5
include/uapi/linux/tcp.h
View file

@ -285,6 +285,11 @@ struct tcp_info {
__u32 tcpi_snd_wnd; /* peer's advertised receive window after
* scaling (bytes)
*/
__u32 tcpi_rcv_wnd; /* local advertised receive window after
* scaling (bytes)
*/
__u32 tcpi_rehash; /* PLB or timeout triggered rehash attempts */
};
/* netlink attributes types for SCM_TIMESTAMPING_OPT_STATS */

2
net/ipv4/tcp.c
View file

@ -3623,6 +3623,8 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
info->tcpi_reord_seen = tp->reord_seen;
info->tcpi_rcv_ooopack = tp->rcv_ooopack;
info->tcpi_snd_wnd = tp->snd_wnd;
info->tcpi_rcv_wnd = tp->rcv_wnd;
info->tcpi_rehash = tp->plb_rehash + tp->timeout_rehash;
info->tcpi_fastopen_client_fail = tp->fastopen_client_fail;
unlock_sock_fast(sk, slow);
}