netdev - Re: [PATCH net-next] selftests: net: local_termination: annotate the expected failures

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Date: Mon, 13 May 2024 15:25:38 +0200
From: Petr Machata <petrm@...dia.com>
To: Jakub Kicinski <kuba@...nel.org>
CC: <davem@...emloft.net>, <netdev@...r.kernel.org>, <edumazet@...gle.com>,
	<pabeni@...hat.com>, <vladimir.oltean@....com>, <shuah@...nel.org>,
	<petrm@...dia.com>, <liuhangbin@...il.com>, <bpoirier@...dia.com>,
	<linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH net-next] selftests: net: local_termination: annotate
 the expected failures


Jakub Kicinski <kuba@...nel.org> writes:

> @@ -157,7 +168,7 @@ run_test()
>  
>  	check_rcv $rcv_if_name "Unicast IPv4 to unknown MAC address" \
>  		"$smac > $UNKNOWN_UC_ADDR1, ethertype IPv4 (0x0800)" \
> -		false
> +		false true
>  
>  	check_rcv $rcv_if_name "Unicast IPv4 to unknown MAC address, promisc" \
>  		"$smac > $UNKNOWN_UC_ADDR2, ethertype IPv4 (0x0800)" \

For veth specifically there is xfail_on_veth:

xfail_on_veth $rcv_if_name \
	check_rcv $rcv_if_name "Unicast IPv4 to unknown MAC address" \
		  "$smac > $UNKNOWN_UC_ADDR1, ethertype IPv4 (0x0800)" \
		  false

Which is IMHO clearer than passing an extra boolean.

Not sure what to do about the bridge bit though. In principle the
various xfail_on_'s can be chained, so e.g. this should work:

xfail_on_bridge $rcv_if_name \
xfail_on_veth $rcv_if_name \
	check_rcv $rcv_if_name "Unicast IPv4 to unknown MAC address" \
		  "$smac > $UNKNOWN_UC_ADDR1, ethertype IPv4 (0x0800)" \
		  false

I find this preferable to adding these ad-hoc tweaks to each test
individually. Maybe it would make sense to have:

xfail_on_kind $rcv_if_name veth bridge \
	check_rcv $rcv_if_name "Unicast IPv4 to unknown MAC address" \
		  "$smac > $UNKNOWN_UC_ADDR1, ethertype IPv4 (0x0800)" \
		  false

And then either replace the existing xfail_on_veth's (there are just a
handful) or convert xfail_on_veth to a wrapper around xfail_on_kind.