selftests: pmtu: Minimum MTU for vti6 is 68

A vti6 interface can carry IPv4 packets too.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/tools/testing/selftests/net/pmtu.sh b/tools/testing/selftests/net/pmtu.sh
index 1e42878..7651fd4 100755 (executable)
--- 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