netdev - [PATCH v2] Documentation: fix outdated interpretation of ip_no_pmtu

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Date:   Thu, 30 Dec 2021 03:28:56 +0000
From:   cgel.zte@...il.com
To:     kuba@...nel.org, davem@...emloft.net, corbet@....net
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, xu xin <xu.xin16@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH v2] Documentation: fix outdated interpretation of ip_no_pmtu_disc

From: xu xin <xu.xin16@....com.cn>

The updating way of pmtu has changed, but documentation is still in the
old way. So this patch updates the interpretation of ip_no_pmtu_disc and
min_pmtu.

See commit 28d35bcdd3925 ("net: ipv4: don't let PMTU updates increase
route MTU")

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: xu xin <xu.xin16@....com.cn>
---
 Documentation/networking/ip-sysctl.rst | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
index c04431144f7a..2572eecc3e86 100644
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst
@@ -25,7 +25,8 @@ ip_default_ttl - INTEGER
 ip_no_pmtu_disc - INTEGER
 	Disable Path MTU Discovery. If enabled in mode 1 and a
 	fragmentation-required ICMP is received, the PMTU to this
-	destination will be set to min_pmtu (see below). You will need
+	destination will be set to the smallest of the old MTU to
+	this destination and min_pmtu (see below). You will need
 	to raise min_pmtu to the smallest interface MTU on your system
 	manually if you want to avoid locally generated fragments.
 
@@ -49,7 +50,8 @@ ip_no_pmtu_disc - INTEGER
 	Default: FALSE
 
 min_pmtu - INTEGER
-	default 552 - minimum discovered Path MTU
+	default 552 - minimum Path MTU. Unless this is changed mannually,
+	each cached pmtu will never be lower than this setting.
 
 ip_forward_use_pmtu - BOOLEAN
 	By default we don't trust protocol path MTUs while forwarding
-- 
2.25.1