netdev - Re: [PATCHv2 net] selftests/net: use tc rule to filter the na packet

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Date: Fri, 17 May 2024 10:14:02 +0100
From: Simon Horman <horms@...nel.org>
To: Hangbin Liu <liuhangbin@...il.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>,
	Shuah Khan <shuah@...nel.org>, Petr Machata <petrm@...dia.com>,
	Benjamin Poirier <bpoirier@...dia.com>,
	Ido Schimmel <idosch@...dia.com>, Jiri Pirko <jiri@...nulli.us>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Jaehee Park <jhpark1013@...il.com>, linux-kselftest@...r.kernel.org
Subject: Re: [PATCHv2 net] selftests/net: use tc rule to filter the na packet

On Fri, May 17, 2024 at 09:03:27AM +0800, Hangbin Liu wrote:
> Test arp_ndisc_untracked_subnets use tcpdump to filter the unsolicited
> and untracked na messages. It set -e before calling tcpdump. But if
> tcpdump filters 0 packet, it will return none zero, and cause the script
> to exit.
> 
> Instead of using slow tcpdump to capture packets, let's using tc rule
> to filter out the na message.
> 
> At the same time, fix function setup_v6 which only needs one parameter.
> Move all the related helpers from forwarding lib.sh to net lib.sh.
> 
> Fixes: 0ea7b0a454ca ("selftests: net: arp_ndisc_untracked_subnets: test for arp_accept and accept_untracked_na")
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>

I see that, as of writing, the last two runs of this test have succeeded.
Which doesn't seem to have occurred since 9th May. So this does seem
positive, albeit perhaps a bit too soon to call.

Jakub, is there a way to tell how long a test took to execute?
Perhaps it's obvious, but I couldn't see it.

Code changes look good to me.

Reviewed-by: Simon Horman <horms@...nel.org>