From 249eddaf651fda7cb32e9ebae4c6d5904b390d81 Mon Sep 17 00:00:00 2001
From: Xin Long <lucien.xin@gmail.com>
Date: Thu, 9 Jun 2022 11:17:15 -0400
Subject: [PATCH] Documentation: add description for net.sctp.ecn_enable
Git-commit: 249eddaf651fda7cb32e9ebae4c6d5904b390d81
Patch-mainline: v5.19-rc3
References: git-fixes

Describe it in networking/ip-sysctl.rst like other SCTP options.

Fixes: 2f5268a9249b ("sctp: allow users to set netns ecn flag with sysctl")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 Documentation/networking/ip-sysctl.rst | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
index 5fe837505d43..9f41961d11d5 100644
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst
@@ -2950,6 +2950,18 @@ intl_enable - BOOLEAN
 
 	Default: 0
 
+ecn_enable - BOOLEAN
+        Control use of Explicit Congestion Notification (ECN) by SCTP.
+        Like in TCP, ECN is used only when both ends of the SCTP connection
+        indicate support for it. This feature is useful in avoiding losses
+        due to congestion by allowing supporting routers to signal congestion
+        before having to drop packets.
+
+        1: Enable ecn.
+        0: Disable ecn.
+
+        Default: 1
+
 
 ``/proc/sys/net/core/*``
 ========================
-- 
2.35.3