linux-kernel - Re: [net 1/2] selftests: seg6: disable DAD on IPv6 router cfg for srv6_end_dt4_l3vpn

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Date:   Wed, 10 May 2023 13:55:53 -0600
From:   David Ahern <dsahern@...nel.org>
To:     Andrea Mayer <andrea.mayer@...roma2.it>,
        "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>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Cc:     Stefano Salsano <stefano.salsano@...roma2.it>,
        Paolo Lungaroni <paolo.lungaroni@...roma2.it>,
        Ahmed Abdelsalam <ahabdels.dev@...il.com>,
        Hangbin Liu <liuhangbin@...il.com>
Subject: Re: [net 1/2] selftests: seg6: disable DAD on IPv6 router cfg for
 srv6_end_dt4_l3vpn_test

On 5/10/23 5:16 AM, Andrea Mayer wrote:
> The srv6_end_dt4_l3vpn_test instantiates a virtual network consisting of
> several routers (rt-1, rt-2) and hosts.
> When the IPv6 addresses of rt-{1,2} routers are configured, the Deduplicate
> Address Detection (DAD) kicks in when enabled in the Linux distros running
> the selftests. DAD is used to check whether an IPv6 address is already
> assigned in a network. Such a mechanism consists of sending an ICMPv6 Echo
> Request and waiting for a reply.
> As the DAD process could take too long to complete, it may cause the
> failing of some tests carried out by the srv6_end_dt4_l3vpn_test script.
> 
> To make the srv6_end_dt4_l3vpn_test more robust, we disable DAD on routers
> since we configure the virtual network manually and do not need any address
> deduplication mechanism at all.
> 
> Fixes: 2195444e09b4 ("selftests: add selftest for the SRv6 End.DT4 behavior")
> Signed-off-by: Andrea Mayer <andrea.mayer@...roma2.it>
> ---
>  tools/testing/selftests/net/srv6_end_dt4_l3vpn_test.sh | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 

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