Documentation: fix sctp_wmem in ip-sysctl.rst

BugLink: https://bugs.launchpad.net/bugs/1989218
[ Upstream commit aa709da0e032cee7c202047ecd75f437bb0126ed ]

Since commit 1033990ac5b2 ("sctp: implement memory accounting on tx path"),
SCTP has supported memory accounting on tx path where 'sctp_wmem' is used
by sk_wmem_schedule(). So we should fix the description for this option in
ip-sysctl.rst accordingly.

v1->v2:
  - Improve the description as Marcelo suggested.

Fixes: 1033990ac5b2 ("sctp: implement memory accounting on tx path")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
index b8b67041f955211e721177bb494eb48aa06a066e..ba0e8e6337c0a347c6c49d756689c0f7a82c565d 100644 (file)
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst
@@ -2808,7 +2808,14 @@ sctp_rmem - vector of 3 INTEGERs: min, default, max
        Default: 4K
 
 sctp_wmem  - vector of 3 INTEGERs: min, default, max
-       Currently this tunable has no effect.
+       Only the first value ("min") is used, "default" and "max" are
+       ignored.
+
+       min: Minimum size of send buffer that can be used by SCTP sockets.
+       It is guaranteed to each SCTP socket (but not association) even
+       under moderate memory pressure.
+
+       Default: 4K
 
 addr_scope_policy - INTEGER
        Control IPv4 address scoping - draft-stewart-tsvwg-sctp-ipv4-00