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selftests: forwarding: lib: Add mtu_set(), mtu_restore()

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Some selftests need to tweak MTU of an interface, and naturally should
at teardown restore the MTU back to the original value. Add two
functions to facilitate this MTU handling: mtu_set() to change MTU
value, and mtu_reset() to change it back to what it was before.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata 2018-09-20 09:21:35 +03:00 committed by David S. Miller
parent 3136a36988
commit a381ed12ea
1 changed files with 17 additions and 0 deletions
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17
tools/testing/selftests/net/forwarding/lib.sh
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@ -549,6 +549,23 @@ forwarding_restore()
sysctl_restore net.ipv4.conf.all.forwarding
}
declare -A MTU_ORIG
mtu_set()
{
local dev=$1; shift
local mtu=$1; shift
MTU_ORIG["$dev"]=$(ip -j link show dev $dev | jq -e '.[].mtu')
ip link set dev $dev mtu $mtu
}
mtu_restore()
{
local dev=$1; shift
ip link set dev $dev mtu ${MTU_ORIG["$dev"]}
}
tc_offload_check()
{
local num_netifs=${1:-$NUM_NETIFS}