Re: [PATCH net-next v7 12/12] selftests: ncdevmem: Add automated test

[Joe Damato <jdamato@fastly.com>]

On Mon, Nov 04, 2024 at 10:14:30AM -0800, Stanislav Fomichev wrote:
> Only RX side for now and small message to test the setup.
> In the future, we can extend it to TX side and to testing
> both sides with a couple of megs of data.
> 
>   make \
>   	-C tools/testing/selftests \
>   	TARGETS="drivers/hw/net" \
>   	install INSTALL_PATH=~/tmp/ksft
> 
>   scp ~/tmp/ksft ${HOST}:
>   scp ~/tmp/ksft ${PEER}:
> 
>   cfg+="NETIF=${DEV}\n"
>   cfg+="LOCAL_V6=${HOST_IP}\n"
>   cfg+="REMOTE_V6=${PEER_IP}\n"
>   cfg+="REMOTE_TYPE=ssh\n"
>   cfg+="REMOTE_ARGS=root@${PEER}\n"
> 
>   echo -e "$cfg" | ssh root@${HOST} "cat > ksft/drivers/net/net.config"
>   ssh root@${HOST} "cd ksft && ./run_kselftest.sh -t drivers/net:devmem.py"
> 
> Reviewed-by: Mina Almasry <almasrymina@google.com>
> Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
> ---
>  .../testing/selftests/drivers/net/hw/Makefile |  1 +
>  .../selftests/drivers/net/hw/devmem.py        | 45 +++++++++++++++++++
>  2 files changed, 46 insertions(+)
>  create mode 100755 tools/testing/selftests/drivers/net/hw/devmem.py
> 
> diff --git a/tools/testing/selftests/drivers/net/hw/Makefile b/tools/testing/selftests/drivers/net/hw/Makefile
> index 182348f4bd40..1c6a77480923 100644
> --- a/tools/testing/selftests/drivers/net/hw/Makefile
> +++ b/tools/testing/selftests/drivers/net/hw/Makefile
> @@ -3,6 +3,7 @@
>  TEST_PROGS = \
>  	csum.py \
>  	devlink_port_split.py \
> +	devmem.py \
>  	ethtool.sh \
>  	ethtool_extended_state.sh \
>  	ethtool_mm.sh \
> diff --git a/tools/testing/selftests/drivers/net/hw/devmem.py b/tools/testing/selftests/drivers/net/hw/devmem.py
> new file mode 100755
> index 000000000000..1416c31ff81e
> --- /dev/null
> +++ b/tools/testing/selftests/drivers/net/hw/devmem.py
> @@ -0,0 +1,45 @@
> +#!/usr/bin/env python3
> +# SPDX-License-Identifier: GPL-2.0
> +
> +from lib.py import ksft_run, ksft_exit
> +from lib.py import ksft_eq, KsftSkipEx
> +from lib.py import NetDrvEpEnv
> +from lib.py import bkg, cmd, rand_port, wait_port_listen
> +from lib.py import ksft_disruptive
> +
> +
> +def require_devmem(cfg):
> +    if not hasattr(cfg, "_devmem_probed"):
> +        port = rand_port()
> +        probe_command = f"./ncdevmem -f {cfg.ifname}"
> +        cfg._devmem_supported = cmd(probe_command, fail=False, shell=True).ret == 0
> +        cfg._devmem_probed = True
> +
> +    if not cfg._devmem_supported:
> +        raise KsftSkipEx("Test requires devmem support")
> +
> +
> +@ksft_disruptive
> +def check_rx(cfg) -> None:
> +    cfg.require_v6()
> +    require_devmem(cfg)
> +
> +    port = rand_port()
> +    listen_cmd = f"./ncdevmem -l -f {cfg.ifname} -s {cfg.v6} -p {port}"
> +
> +    with bkg(listen_cmd) as nc:
> +        wait_port_listen(port)
> +        cmd(f"echo -e \"hello\\nworld\"| nc {cfg.v6} {port}", host=cfg.remote, shell=True)

FWIW, in the v3 of the series I submit, Jakub asked me to replace nc
with socat due to issues with nc [1].

Your usage of nc seems pretty basic though, so maybe it's fine?

[1]: https://lore.kernel.org/netdev/20241101063426.2e1423a8@kernel.org/