[PATCH net-next v2 5/5] tcp: add rcv_wnd and plb_rehash to TCP_INFO
From: Mubashir Adnan Qureshi <hidden>
Date: 2022-09-30 04:55:36
Subsystem:
networking [general], networking [tcp], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Neal Cardwell, Linus Torvalds
From: Mubashir Adnan Qureshi <redacted> 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 <redacted> Signed-off-by: Yuchung Cheng <redacted> Signed-off-by: Neal Cardwell <ncardwell@google.com> Reviewed-by: Eric Dumazet <edumazet@google.com> --- include/uapi/linux/tcp.h | 5 +++++ net/ipv4/tcp.c | 2 ++ 2 files changed, 7 insertions(+)
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index c9abe86eda5f..879eeb0a084b 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h@@ -284,6 +284,11 @@ 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 */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 685c06c6d33f..a0b518f63c3a 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c@@ -3936,6 +3936,8 @@ 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); }
--
2.38.0.rc1.362.ged0d419d3c-goog