netdev - [PATCH net-next] Documentation: Describe net.ipv4.tcp_reflect

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Message-ID: <4376126910096258f0a9da93ec53cad99a072afc.1658920560.git.gnault@redhat.com>
Date:   Wed, 27 Jul 2022 13:18:21 +0200
From:   Guillaume Nault <gnault@...hat.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     netdev@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        linux-doc@...r.kernel.org
Subject: [PATCH net-next] Documentation: Describe net.ipv4.tcp_reflect_tos.

The tcp_reflect_tos option was introduced in Linux 5.10 but was still
undocumented.

Signed-off-by: Guillaume Nault <gnault@...hat.com>
---
 Documentation/networking/ip-sysctl.rst | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
index 5879ef3bc2cb..70f009f75e74 100644
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst
@@ -636,6 +636,16 @@ tcp_recovery - INTEGER
 
 	Default: 0x1
 
+tcp_reflect_tos - BOOLEAN
+	For listening sockets, reuse the DSCP value of the initial SYN message
+	for outgoing packets. This allows to have both directions of a TCP
+	stream to use the same DSCP value, assuming DSCP remains unchanged for
+	the lifetime of the connection.
+
+	This options affects both IPv4 and IPv6.
+
+	Default: 0 (disabled)
+
 tcp_reordering - INTEGER
 	Initial reordering level of packets in a TCP stream.
 	TCP stack can then dynamically adjust flow reordering level
-- 
2.21.3