[PATCH net 3/3] Documentation: add description for net.sctp.ecn_enable

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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@xxxxxxxxx>
---
 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 b67f2f83ff32..52ce71aceb5a 100644
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst
@@ -2955,6 +2955,18 @@ 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/*``
 ========================
-- 
2.31.1




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