netdev - Re: [PATCH net 08/14] selftests: net: bridge_vlan_aware: test that other TPIDs are seen as untagged

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Message-ID: <Zr3GK3NeZGGt2lpx@shredder.mtl.com>
Date: Thu, 15 Aug 2024 12:11:07 +0300
From: Ido Schimmel <idosch@...dia.com>
To: Vladimir Oltean <vladimir.oltean@....com>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Claudiu Manoil <claudiu.manoil@....com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	Antoine Tenart <atenart@...nel.org>, UNGLinuxDriver@...rochip.com,
	Hongbo Wang <hongbo.wang@....com>,
	Xiaoliang Yang <xiaoliang.yang_1@....com>,
	Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	Colin Foster <colin.foster@...advantage.com>,
	Horatiu Vultur <horatiu.vultur@...rochip.com>,
	Hangbin Liu <liuhangbin@...il.com>, Petr Machata <petrm@...dia.com>,
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 08/14] selftests: net: bridge_vlan_aware: test that
 other TPIDs are seen as untagged

On Thu, Aug 15, 2024 at 03:07:01AM +0300, Vladimir Oltean wrote:
> The bridge VLAN implementation w.r.t. VLAN protocol is described in
> merge commit 1a0b20b25732 ("Merge branch 'bridge-next'"). We are only
> sensitive to those VLAN tags whose TPID is equal to the bridge's
> vlan_protocol. Thus, an 802.1ad VLAN should be treated as 802.1Q-untagged.
> 
> Add 3 tests which validate that:
> - 802.1ad-tagged traffic is learned into the PVID of an 802.1Q-aware
>   bridge
> - Double-tagged traffic is forwarded when just the PVID of the port is
>   present in the VLAN group of the ports
> - Double-tagged traffic is not forwarded when the PVID of the port is
>   absent from the VLAN group of the ports
> 
> The test passes with both veth and ocelot.

Thanks for the test. Passes with mlxsw as well.

> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Reviewed-by: Ido Schimmel <idosch@...dia.com>
Tested-by: Ido Schimmel <idosch@...dia.com>

One question below

> ---
>  .../net/forwarding/bridge_vlan_aware.sh       | 54 ++++++++++++++++++-
>  1 file changed, 53 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/net/forwarding/bridge_vlan_aware.sh b/tools/testing/selftests/net/forwarding/bridge_vlan_aware.sh
> index 64bd00fe9a4f..90f8a244ea90 100755
> --- a/tools/testing/selftests/net/forwarding/bridge_vlan_aware.sh
> +++ b/tools/testing/selftests/net/forwarding/bridge_vlan_aware.sh
> @@ -1,7 +1,7 @@
>  #!/bin/bash
>  # SPDX-License-Identifier: GPL-2.0
>  
> -ALL_TESTS="ping_ipv4 ping_ipv6 learning flooding vlan_deletion extern_learn"
> +ALL_TESTS="ping_ipv4 ping_ipv6 learning flooding vlan_deletion extern_learn other_tpid"
>  NUM_NETIFS=4
>  CHECK_TC="yes"
>  source lib.sh
> @@ -142,6 +142,58 @@ extern_learn()
>  	bridge fdb del de:ad:be:ef:13:37 dev $swp1 master vlan 1 &> /dev/null
>  }
>  
> +other_tpid()
> +{
> +	local mac=de:ad:be:ef:13:37
> +
> +	# Test that packets with TPID 802.1ad VID 3 + TPID 802.1Q VID 5 are
> +	# classified as untagged by a bridge with vlan_protocol 802.1Q, and
> +	# are processed in the PVID of the ingress port (here 1). Not VID 3,
> +	# and not VID 5.
> +	RET=0
> +
> +	tc qdisc add dev $h2 clsact
> +	tc filter add dev $h2 ingress protocol all pref 1 handle 101 \
> +		flower dst_mac $mac action drop
> +	ip link set $h2 promisc on
> +	ethtool -K $h2 rx-vlan-filter off rx-vlan-stag-filter off

Any reason not to undo it at the end of the test like other settings?

> +
> +	$MZ -q $h1 -c 1 -b $mac -a own "88:a8 00:03 81:00 00:05 08:00 aa-aa-aa-aa-aa-aa-aa-aa-aa"
> +	sleep 1
> +
> +	# Match on 'self' addresses as well, for those drivers which
> +	# do not push their learned addresses to the bridge software
> +	# database
> +	bridge -j fdb show $swp1 | \
> +		jq -e ".[] | select(.mac == \"$(mac_get $h1)\") | select(.vlan == 1)" &> /dev/null
> +	check_err $? "FDB entry was not learned when it should"
> +
> +	log_test "FDB entry in PVID for VLAN-tagged with other TPID"
> +
> +	RET=0
> +	tc -j -s filter show dev $h2 ingress \
> +		| jq -e ".[] | select(.options.handle == 101) \
> +		| select(.options.actions[0].stats.packets == 1)" &> /dev/null
> +	check_err $? "Packet was not forwarded when it should"
> +	log_test "Reception of VLAN with other TPID as untagged"
> +
> +	bridge vlan del dev $swp1 vid 1
> +
> +	$MZ -q $h1 -c 1 -b $mac -a own "88:a8 00:03 81:00 00:05 08:00 aa-aa-aa-aa-aa-aa-aa-aa-aa"
> +	sleep 1
> +
> +	RET=0
> +	tc -j -s filter show dev $h2 ingress \
> +		| jq -e ".[] | select(.options.handle == 101) \
> +		| select(.options.actions[0].stats.packets == 1)" &> /dev/null
> +	check_err $? "Packet was forwarded when should not"
> +	log_test "Reception of VLAN with other TPID as untagged (no PVID)"
> +
> +	bridge vlan add dev $swp1 vid 1 pvid untagged
> +	ip link set $h2 promisc off
> +	tc qdisc del dev $h2 clsact
> +}
> +
>  trap cleanup EXIT
>  
>  setup_prepare
> -- 
> 2.34.1
>