From 71fc704768f601ed3fa36310822a5e03f310f781 Mon Sep 17 00:00:00 2001
From: Mubashir Adnan Qureshi <mubashirq@google.com>
Date: Wed, 26 Oct 2022 13:51:15 +0000
Subject: [PATCH] tcp: add rcv_wnd and plb_rehash to TCP_INFO
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>
---
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 1da7c53b6cb5..de8f0cd7cb32 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3940,6 +3940,8 @@ 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);
}
--
2.42.0