netdev - Re: [PATCH iwl-next v2] ice: Reset VF on Tx MDD event

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Date: Mon, 18 Dec 2023 15:06:37 -0800
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: Pawel Chmielewski <pawel.chmielewski@...el.com>, Michal Schmidt
	<mschmidt@...hat.com>
CC: <intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>,
	<pmenzel@...gen.mpg.de>, <lukasz.czapnik@...el.com>, Liang-Min Wang
	<liang-min.wang@...el.com>, Michal Swiatkowski
	<michal.swiatkowski@...ux.intel.com>
Subject: Re: [PATCH iwl-next v2] ice: Reset VF on Tx MDD event



On 12/14/2023 8:51 AM, Pawel Chmielewski wrote:
> On Thu, Dec 14, 2023 at 09:37:32AM +0100, Michal Schmidt wrote:
>> On Thu, Nov 2, 2023 at 4:56 PM Pawel Chmielewski
>> <pawel.chmielewski@...el.com> wrote:
>>> From: Liang-Min Wang <liang-min.wang@...el.com>

...

>>> When Malicious Driver Detection event occurs, perform graceful VF reset
>>> to quickly bring VF back to operational state. Add a log message to
>>> notify about the cause of the reset.
>>
>> Sorry for bringing this up so late, but I have just now realized this:
>> Wasn't freezing of the queue originally the intended behavior, as a
>> penalty for being malicious?
>> Shouldn't these resets at least be guarded by ICE_FLAG_MDD_AUTO_RESET_VF?
>>
>> Michal
> 
> In some cases, the MDD can be caused also by a regular software error
> (like the one mentioned in commit message), and not the actual malicious
> action. There was decision to change the default behavior to avoid denial
> of service.

Michal brings up some valid questions. I'd like to clarify the 
expectations between how the two should work together before moving 
forward with this.

Thanks,
Tony