netdev - Re: [PATCH net v2 09/17] selftests: forwarding: hw_stats_l3

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Date: Wed, 9 Aug 2023 10:02:22 +0800
From: Hangbin Liu <liuhangbin@...il.com>
To: Ido Schimmel <idosch@...dia.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
	pabeni@...hat.com, edumazet@...gle.com, petrm@...dia.com,
	razor@...ckwall.org, mirsad.todorovac@....unizg.hr
Subject: Re: [PATCH net v2 09/17] selftests: forwarding: hw_stats_l3_gre:
 Skip when using veth pairs

On Tue, Aug 08, 2023 at 05:14:55PM +0300, Ido Schimmel wrote:
> Layer 3 hardware stats cannot be used when the underlying interfaces are
> veth pairs, resulting in failures:
> 
>  # ./hw_stats_l3_gre.sh
>  TEST: ping gre flat                                                 [ OK ]
>  TEST: Test rx packets:                                              [FAIL]
>          Traffic not reflected in the counter: 0 -> 0
>  TEST: Test tx packets:                                              [FAIL]
>          Traffic not reflected in the counter: 0 -> 0
> 
> Fix by skipping the test when used with veth pairs.
> 
> Fixes: 813f97a26860 ("selftests: forwarding: Add a tunnel-based test for L3 HW stats")
> Reported-by: Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
> Closes: https://lore.kernel.org/netdev/adc5e40d-d040-a65e-eb26-edf47dac5b02@alu.unizg.hr/
> Signed-off-by: Ido Schimmel <idosch@...dia.com>
> Reviewed-by: Petr Machata <petrm@...dia.com>
> Tested-by: Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
> ---
>  tools/testing/selftests/net/forwarding/hw_stats_l3_gre.sh | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/tools/testing/selftests/net/forwarding/hw_stats_l3_gre.sh b/tools/testing/selftests/net/forwarding/hw_stats_l3_gre.sh
> index eb9ec4a68f84..7594bbb49029 100755
> --- a/tools/testing/selftests/net/forwarding/hw_stats_l3_gre.sh
> +++ b/tools/testing/selftests/net/forwarding/hw_stats_l3_gre.sh
> @@ -99,6 +99,8 @@ test_stats_rx()
>  	test_stats g2a rx
>  }
>  
> +skip_on_veth
> +
>  trap cleanup EXIT
>  
>  setup_prepare

Petr has been add a veth check for this script in a9fda7a0b033 ("selftests:
forwarding: hw_stats_l3: Detect failure to install counters"). I think we can
remove it with your patch?

Thanks
Hangbin