Re: [PATCH net] selftests: net: big_tcp_tunnels: Fix the IPv6 route change

[Narcisa Vasile]

On Wed, Oct 07, 2026 at 09:47:31AM +0800, Haishuang Yan wrote:
> On slow machines, do_test() raises initcwnd on the route into the tunnel
> with "ip route change". For IPv6 traffic this fails with:
> 
>   RTNETLINK answers: No such file or directory
> 
> The IPv6 prefix route of the tunnel address has metric 256, while
> "ip -6 route change" without a metric looks for a route with the default
> metric 1024, so nothing is changed. The test still passes, but without
> the larger initcwnd it is meant to use.
> 
> Pass the metric of the prefix route.
> 
> Fixes: 1d62b83fb751 ("selftests: net: Fix slow configurations in big_tcp_tunnels.sh")
> Signed-off-by: Haishuang Yan <yanhaishuang@xxxxxxxxxxxxxxxxxxxx>
> ---
>  tools/testing/selftests/net/big_tcp_tunnels.sh | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Reviewed-by: Narcisa Vasile <narcisav.kernel@xxxxxxxxx>