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Message-ID: <ed579a55-c300-b89e-4741-efdc1f3b5ba5@kernel.org>
Date:   Wed, 10 May 2023 13:56:59 -0600
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Subject: Re: [net 2/2] selftets: seg6: disable rp_filter by default in
 srv6_end_dt4_l3vpn_test
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To:     Andrea Mayer <andrea.mayer@uniroma2.it>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>, Shuah Khan <shuah@kernel.org>,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        linux-kselftest@vger.kernel.org
Cc:     Stefano Salsano <stefano.salsano@uniroma2.it>,
        Paolo Lungaroni <paolo.lungaroni@uniroma2.it>,
        Ahmed Abdelsalam <ahabdels.dev@gmail.com>,
        Hangbin Liu <liuhangbin@gmail.com>
References: <20230510111638.12408-1-andrea.mayer@uniroma2.it>
 <20230510111638.12408-3-andrea.mayer@uniroma2.it>
From:   David Ahern <dsahern@kernel.org>
In-Reply-To: <20230510111638.12408-3-andrea.mayer@uniroma2.it>
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On 5/10/23 5:16 AM, Andrea Mayer wrote:
> On some distributions, the rp_filter is automatically set (=1) by
> default on a netdev basis (also on VRFs).
> In an SRv6 End.DT4 behavior, decapsulated IPv4 packets are routed using
> the table associated with the VRF bound to that tunnel. During lookup
> operations, the rp_filter can lead to packet loss when activated on the
> VRF.
> Therefore, we chose to make this selftest more robust by explicitly
> disabling the rp_filter during tests (as it is automatically set by some
> Linux distributions).
> 
> Fixes: 2195444e09b4 ("selftests: add selftest for the SRv6 End.DT4 behavior")
> Reported-by: Hangbin Liu <liuhangbin@gmail.com>
> Signed-off-by: Andrea Mayer <andrea.mayer@uniroma2.it>
> Tested-by: Hangbin Liu <liuhangbin@gmail.com>
> ---
>  .../testing/selftests/net/srv6_end_dt4_l3vpn_test.sh  | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@kernel.org>