netdev - [PATCH net-next] selftests: pmtu: Minimum MTU for vti6 is 68

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Date:   Thu, 26 Apr 2018 19:41:02 +0200
From:   Stefano Brivio <sbrivio@...hat.com>
To:     "David S . Miller" <davem@...emloft.net>
Cc:     Steffen Klassert <steffen.klassert@...unet.com>,
        Xin Long <lucien.xin@...il.com>,
        Alexey Kodanev <alexey.kodanev@...cle.com>,
        Jarod Wilson <jarod@...hat.com>,
        Sabrina Dubroca <sd@...asysnail.net>, netdev@...r.kernel.org
Subject: [PATCH net-next] selftests: pmtu: Minimum MTU for vti6 is 68

A vti6 interface can carry IPv4 packets too.

Signed-off-by: Stefano Brivio <sbrivio@...hat.com>
---
 tools/testing/selftests/net/pmtu.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/net/pmtu.sh b/tools/testing/selftests/net/pmtu.sh
index 1e428781a625..7651fd4d86fe 100755
--- a/tools/testing/selftests/net/pmtu.sh
+++ b/tools/testing/selftests/net/pmtu.sh
@@ -368,7 +368,7 @@ test_pmtu_vti6_link_add_mtu() {
 
 	fail=0
 
-	min=1280
+	min=68			# vti6 can carry IPv4 packets too
 	max=$((65535 - 40))
 	# Check invalid values first
 	for v in $((min - 1)) $((max + 1)); do
@@ -384,7 +384,7 @@ test_pmtu_vti6_link_add_mtu() {
 	done
 
 	# Now check valid values
-	for v in 1280 1300 $((65535 - 40)); do
+	for v in 68 1280 1300 $((65535 - 40)); do
 		${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
 		mtu="$(link_get_mtu "${ns_a}" vti6_a)"
 		${ns_a} ip link del vti6_a
-- 
2.15.1