Re: [PATCH net-next v2 3/3] selftests/net: test tcp connection load balancing

[Ido Schimmel <idosch@nvidia.com>]

On Thu, Apr 24, 2025 at 10:35:20AM -0400, Willem de Bruijn wrote:
> From: Willem de Bruijn <willemb@google.com>
> 
> Verify that TCP connections use both routes when connecting multiple
> times to a remote service over a two nexthop multipath route.
> 
> Use socat to create the connections. Use tc prio + tc filter to
> count routes taken, counting SYN packets across the two egress
> devices. Also verify that the saddr matches that of the device.
> 
> To avoid flaky tests when testing inherently randomized behavior,
> set a low bar and pass if even a single SYN is observed on each
> device.
> 
> Signed-off-by: Willem de Bruijn <willemb@google.com>

Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Tested-by: Ido Schimmel <idosch@nvidia.com>

> 
> ---
> 
> v1->v2
>   - match also on saddr, not only SYN
>   - move from fib_nexthops.sh to fib_tests.sh
>       - move generic "count packets on dev" to lib.sh
>   - switch from netcat to socat, as different netcats go around

Thanks!