netdev - Re: [PATCH net] netdevsim: Fix hwstats debugfs file permissions

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Date:   Mon, 12 Sep 2022 10:57:06 +0200
From:   Petr Machata <petrm@...dia.com>
To:     Ido Schimmel <idosch@...dia.com>
CC:     <netdev@...r.kernel.org>, <davem@...emloft.net>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <edumazet@...gle.com>, <petrm@...dia.com>,
        <jie2x.zhou@...el.com>, <mlxsw@...dia.com>
Subject: Re: [PATCH net] netdevsim: Fix hwstats debugfs file permissions


Ido Schimmel <idosch@...dia.com> writes:

> The hwstats debugfs files are only writeable, but they are created with
> read and write permissions, causing certain selftests to fail [1].
>
> Fix by creating the files with write permission only.
>
> [1]
>  # ./test_offload.py
>  Test destruction of generic XDP...
>  Traceback (most recent call last):
>    File "/home/idosch/code/linux/tools/testing/selftests/bpf/./test_offload.py", line 810, in <module>
>      simdev = NetdevSimDev()
>  [...]
>  Exception: Command failed: cat /sys/kernel/debug/netdevsim/netdevsim0//ports/0/dev/hwstats/l3/disable_ifindex
>
>  cat: /sys/kernel/debug/netdevsim/netdevsim0//ports/0/dev/hwstats/l3/disable_ifindex: Invalid argument
>
> Fixes: 1a6d7ae7d63c ("netdevsim: Introduce support for L3 offload xstats")
> Reported-by: Jie2x Zhou <jie2x.zhou@...el.com>
> Tested-by: Jie2x Zhou <jie2x.zhou@...el.com>
> Signed-off-by: Ido Schimmel <idosch@...dia.com>

Reviewed-by: Petr Machata <petrm@...dia.com>