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    Subject[PATCH AUTOSEL 4.18 47/76] selftests: pmtu: maximum MTU for vti4 is 2^16-1-20
    Date
    From: Sabrina Dubroca <sd@queasysnail.net>

    [ Upstream commit 902b5417f28d955cdb4898df6ffaab15f56c5cff ]

    Since commit 82612de1c98e ("ip_tunnel: restore binding to ifaces with a
    large mtu"), the maximum MTU for vti4 is based on IP_MAX_MTU instead of
    the mysterious constant 0xFFF8. This makes this selftest fail.

    Fixes: 82612de1c98e ("ip_tunnel: restore binding to ifaces with a large mtu")
    Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
    Acked-by: Stefano Brivio <sbrivio@redhat.com>
    Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    ---
    tools/testing/selftests/net/pmtu.sh | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/tools/testing/selftests/net/pmtu.sh b/tools/testing/selftests/net/pmtu.sh
    index f8cc38afffa2..0ecf2609b9a4 100755
    --- a/tools/testing/selftests/net/pmtu.sh
    +++ b/tools/testing/selftests/net/pmtu.sh
    @@ -334,7 +334,7 @@ test_pmtu_vti4_link_add_mtu() {
    fail=0

    min=68
    - max=$((65528 - 20))
    + max=$((65535 - 20))
    # Check invalid values first
    for v in $((min - 1)) $((max + 1)); do
    ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 2>/dev/null
    --
    2.17.1
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