netdev - Re: [PATCH net-next v2 12/12] selftests: ncdevmem: Add automated test

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Message-ID: <CAHS8izMNHUkufZS_nMD7uTmzSfAqWYqfAiZiuH1OOVDw7WGhQA@mail.gmail.com>
Date: Thu, 3 Oct 2024 00:39:05 -0700
From: Mina Almasry <almasrymina@...gle.com>
To: Stanislav Fomichev <sdf@...ichev.me>
Cc: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com, 
	kuba@...nel.org, pabeni@...hat.com
Subject: Re: [PATCH net-next v2 12/12] selftests: ncdevmem: Add automated test

On Mon, Sep 30, 2024 at 10:18 AM Stanislav Fomichev <sdf@...ichev.me> 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.
>

This is really awesome. Thank you.

>   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"

Not a review comment but noob question: does NIPA not support ipv4? Or
is ipv6 preferred here?

>   cfg+="REMOTE_TYPE=ssh\n"
>   cfg+="REMOTE_ARGS=root@...EER}\n"
>
>   echo -e "$cfg" | ssh root@...OST} "cat > ksft/drivers/net/net.config"
>   ssh root@...OST} "cd ksft && ./run_kselftest.sh -t drivers/net:devmem.py"
>
> Cc: Mina Almasry <almasrymina@...gle.com>
> Signed-off-by: Stanislav Fomichev <sdf@...ichev.me>
> ---
>  .../testing/selftests/drivers/net/hw/Makefile |  1 +
>  .../selftests/drivers/net/hw/devmem.py        | 46 +++++++++++++++++++
>  2 files changed, 47 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 7bce46817953..a582b1bb3ae1 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..29085591616b
> --- /dev/null
> +++ b/tools/testing/selftests/drivers/net/hw/devmem.py
> @@ -0,0 +1,46 @@
> +#!/usr/bin/env python3
> +# SPDX-License-Identifier: GPL-2.0
> +
> +import errno
> +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")
> +
> +
> +@...t_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}"

So AFAICT adding validation to this test is simple. What you would do
is change the above line to:

listen_cmd = f"./ncdevmem -l -f {cfg.ifname} -s {cfg.v6} -p {port} -v 7"

then, below...

> +
> +    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)
> +

...change this to the equivalent of 'yes $(echo -e
\\x01\\x02\\x03\\x04\\x05\\x06) | tr \\n \\0 | head -c 1G"

> +    ksft_eq(nc.stdout.strip(), "hello\nworld")
> +

...then remove this ksft_eq().

But this is just a suggestion, I think you were leaving this to future
work for me, which is fine.

Reviewed-by: Mina Almasry <almasrymina@...gle.com>


-- 
Thanks,
Mina