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SubjectRe: [PATCH] net: add support for netdev notifier error injection
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On 12/01/2015 12:48 AM, Akinobu Mita wrote:
> 2015-11-28 21:45 GMT+09:00 Nikolay Aleksandrov <razor@blackwall.org>:
>> From: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
>>
>> This module allows to insert errors in some of netdevice's notifier
>> events. All network drivers use these notifiers to signal various events
>> and to check if they are allowed, e.g. PRECHANGEMTU and CHANGEMTU
>> afterwards. Until recently I had to run failure tests by injecting
>> a custom module, but now this infrastructure makes it trivial to test
>> these failure paths. Some of the recent bugs I fixed were found using
>> this module.
>> Here's an example:
>> $ cd /sys/kernel/debug/notifier-error-inject/netdev
>> $ echo -22 > actions/NETDEV_CHANGEMTU/error
>> $ ip link set eth0 mtu 1024
>> RTNETLINK answers: Invalid argument
>
> This patch looks good to me. It would be nice if you add tools like
> tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh for this feature.
>

Thanks for reviewing and noted. I'll take a look and make some tests.
Do you mind if I post it as a follow-up ?

Cheers,
Nik



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