selftests: drv-net: Add VLAN test

Add a test that validates ping traffic over VLAN interfaces. It aims
to catch drivers which mishandle hardware VLAN tag stripping, in
particular QinQ.

Three VLAN c

selftests: drv-net: Add VLAN test

Add a test that validates ping traffic over VLAN interfaces. It aims
to catch drivers which mishandle hardware VLAN tag stripping, in
particular QinQ.

Three VLAN configurations are covered, each with hardware RX VLAN
stripping enabled and disabled (via the rx-vlan-offload and
rx-vlan-stag-hw-parse features):
- a single 802.1q VLAN interface
- a single 802.1ad VLAN interface
- an 802.1q VLAN stacked on top of an 802.1ad interface

The "hw" test variants enable the RX VLAN stripping features supported
by the device (rx-vlan-offload and rx-vlan-stag-hw-parse), the "sw"
test variants disable all of them. A test is xfailed if the requested
configuration is not possible.

VLAN insertion offloads are not tested for now.

NETIF=end0 LOCAL_V4=172.16.0.2 REMOTE_V4=172.16.0.3 \
REMOTE_TYPE=ssh REMOTE_ARGS=root@172.16.0.3 \
run_kselftest.sh -t drivers/net/hw:vlan.py
TAP version 13
1..1
# timeout set to 0
# selftests: drivers/net/hw: vlan.py
# # Interface: end0, driver: st_gmac
# TAP version 13
# 1..6
# ok 1 vlan.test.8021q_hw
# ok 2 vlan.test.8021q_sw
# ok 3 vlan.test.8021ad_hw
# ok 4 vlan.test.8021ad_sw
# ok 5 vlan.test.qinq_hw
# ok 6 vlan.test.qinq_sw
# # Totals: pass:6 fail:0 xfail:0 xpass:0 skip:0 error:0
ok 1 selftests: drivers/net/hw: vlan.py
# Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0

Signed-off-by: Ovidiu Panait <ovidiu.panait.rb@renesas.com>
Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de>
Link: https://patch.msgid.link/20260918112529.96039-4-ovidiu.panait.rb@renesas.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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