linux-kernel - Re: [PATCH net-next v2 4/4] selftests: drv-net: Test that NAPI ID is non-zero

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Message-ID: <CABAhCOTU4xO1XL-LxkU6M8U94vKt_az00b=xL25iT742-puX8w@mail.gmail.com>
Date: Thu, 17 Apr 2025 18:21:44 +0800
From: Xiao Liang <shaw.leon@...il.com>
To: Joe Damato <jdamato@...tly.com>
Cc: netdev@...r.kernel.org, kuba@...nel.org, 
	Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Shuah Khan <shuah@...nel.org>, 
	Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Jesper Dangaard Brouer <hawk@...nel.org>, John Fastabend <john.fastabend@...il.com>, 
	open list <linux-kernel@...r.kernel.org>, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>, 
	"open list:XDP (eXpress Data Path):Keyword:(?:b|_)xdp(?:b|_)" <bpf@...r.kernel.org>
Subject: Re: [PATCH net-next v2 4/4] selftests: drv-net: Test that NAPI ID is non-zero

On Thu, Apr 17, 2025 at 9:33 AM Joe Damato <jdamato@...tly.com> wrote:
>
[...]
> diff --git a/tools/testing/selftests/drivers/net/napi_id.py b/tools/testing/selftests/drivers/net/napi_id.py
> new file mode 100755
> index 000000000000..aee6f90be49b
> --- /dev/null
> +++ b/tools/testing/selftests/drivers/net/napi_id.py
> @@ -0,0 +1,24 @@
> +#!/usr/bin/env python3
> +# SPDX-License-Identifier: GPL-2.0
> +
> +from lib.py import ksft_run, ksft_exit
> +from lib.py import ksft_eq, NetDrvEpEnv
> +from lib.py import bkg, cmd, rand_port, NetNSEnter
> +
> +def test_napi_id(cfg) -> None:
> +    port = rand_port()
> +    listen_cmd = f'{cfg.test_dir / "napi_id_helper"} {cfg.addr_v['4']} {port}'
> +
> +    with bkg(listen_cmd, ksft_wait=3) as server:
> +        with NetNSEnter('net', '/proc/self/ns/'):
> +          cmd(f"echo a | socat - TCP:{cfg.addr_v['4']}:{port}", host=cfg.remote, shell=True)

There's no need to reenter /proc/self/ns/net. And I think
passing `host=cfg.remote` should be sufficient to run
the command in the other netns.