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gro.sh and toeplitz.sh used to source in one of two setup scripts depending on whether the test was expected to be run against veth or a real device. veth testing is replaced by netdevsim and existing "remote endpoint" support in our Python tests. Add a script which sets up loopback mode. The usage is a little bit more complicated than running the scripts used to be. Testing used to work like this: ./../gro.sh -i eth0 ... now the "setup script" has to be run explicitly: NETIF=eth0 ./../ksft_setup_loopback.sh ./../gro.sh But the functionality itself is retained. Reviewed-by: Petr Machata <petrm@nvidia.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Link: https://patch.msgid.link/20251120021024.2944527-13-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>