Neal Cardwell mentioned that rcv_wnd would be useful for helping
diagnose whether a flow is receive-window-limited at a given instant.
This serves the purpose of adding an additional __u32 to avoid the
would-be hole caused by the addition of the tcpi_rcvi_ooopack field.
Signed-off-by: Thomas Higdon <t...@fb.com>
---
include/uapi/linux/tcp.h | 1 +
net/ipv4/tcp.c | 1 +
2 files changed, 2 insertions(+)
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index 20237987ccc8..8a0d1d1af622 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -272,6 +272,7 @@ struct tcp_info {
__u32 tcpi_reord_seen; /* reordering events seen */
__u32 tcpi_rcv_ooopack; /* Out-of-order packets received */
+ __u32 tcpi_rcv_wnd; /* Receive window size */
};
/* netlink attributes types for SCM_TIMESTAMPING_OPT_STATS */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 4cf58208270e..c980145c4247 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3297,6 +3297,7 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
info->tcpi_dsack_dups = tp->dsack_dups;
info->tcpi_reord_seen = tp->reord_seen;
info->tcpi_rcv_ooopack = tp->rcv_ooopack;
+ info->tcpi_rcv_wnd = tp->rcv_wnd;
unlock_sock_fast(sk, slow);
}
EXPORT_SYMBOL_GPL(tcp_get_info);
--
2.17.1
