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selftests: rtnetlink: Add operational state test

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Virtual devices (e.g., VXLAN) that do not have a notion of a carrier are
created with an "UNKNOWN" operational state which some users find
confusing [1].

It is possible to set the operational state from user space either
during device creation or afterwards and some applications will start
doing that in order to avoid the above problem.

Add a test for this functionality to ensure it does not regress.

[1] https://lore.kernel.org/netdev/20241119153703.71f97b76@hermes.local/

Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250717125151.466882-1-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ido Schimmel
2025-07-17 15:51:51 +03:00
committed by Jakub Kicinski
parent e7ce59d920
commit 25250f40e2
1 changed files with 34 additions and 0 deletions
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34
tools/testing/selftests/net/rtnetlink.sh
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@@ -30,6 +30,7 @@ ALL_TESTS="
kci_test_address_proto
kci_test_enslave_bonding
kci_test_mngtmpaddr
kci_test_operstate
"
devdummy="test-dummy0"
@@ -1344,6 +1345,39 @@ kci_test_mngtmpaddr()
return $ret
}
kci_test_operstate()
{
local ret=0
# Check that it is possible to set operational state during device
# creation and that it is preserved when the administrative state of
# the device is toggled.
run_cmd ip link add name vx0 up state up type vxlan id 10010 dstport 4789
run_cmd_grep "state UP" ip link show dev vx0
run_cmd ip link set dev vx0 down
run_cmd_grep "state DOWN" ip link show dev vx0
run_cmd ip link set dev vx0 up
run_cmd_grep "state UP" ip link show dev vx0
run_cmd ip link del dev vx0
# Check that it is possible to set the operational state of the device
# after creation.
run_cmd ip link add name vx0 up type vxlan id 10010 dstport 4789
run_cmd_grep "state UNKNOWN" ip link show dev vx0
run_cmd ip link set dev vx0 state up
run_cmd_grep "state UP" ip link show dev vx0
run_cmd ip link del dev vx0
if [ "$ret" -ne 0 ]; then
end_test "FAIL: operstate"
return 1
fi
end_test "PASS: operstate"
}
kci_test_rtnl()
{
local current_test