[PATCH net 4/4] ipvs: Document sysctl pmtu_disc

To: lvs-devel@xxxxxxxxxxxxxxx
Subject: [PATCH net 4/4] ipvs: Document sysctl pmtu_disc
Cc: Simon Horman <horms@xxxxxxxxxxxx>, netdev@xxxxxxxxxxxxxxx, Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx>, Hangbin Liu <liuhangbin@xxxxxxxxx>
From: Hangbin Liu <liuhangbin@xxxxxxxxx>
Date: Fri, 17 Feb 2017 14:34:01 +0800
Document sysctl pmtu_disc based on commit 3654e61137db ("ipvs: add pmtu_disc
option to disable IP DF for TUN packets").

Signed-off-by: Hangbin Liu <liuhangbin@xxxxxxxxx>
 Documentation/networking/ipvs-sysctl.txt | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/networking/ipvs-sysctl.txt 
index e4d9235..fb65d4a 100644
--- a/Documentation/networking/ipvs-sysctl.txt
+++ b/Documentation/networking/ipvs-sysctl.txt
@@ -175,6 +175,15 @@ nat_icmp_send - BOOLEAN
         for VS/NAT when the load balancer receives packets from real
         servers but the connection entries don't exist.
+pmtu_disc - BOOLEAN
+       0 - disabled
+       not 0 - enabled (default)
+       When enabled PMTU discovery(default) and received packets larger than
+       the next MTU, we will send back FRAG_NEEDED message and drop the
+       incoming packet. But if users prefer to fragment regardless of DF bit
+       other than drop the packet, they can disable it.
 secure_tcp - INTEGER
         0  - disabled (default)

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