netdev - Re: [PATCH net-next RFC 00/13] Add devlink reload level option

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Date:   Tue, 28 Jul 2020 09:43:57 -0700
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     Vasundhara Volam <vasundhara-v.volam@...adcom.com>,
        Moshe Shemesh <moshe@...lanox.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>,
        Netdev <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next RFC 00/13] Add devlink reload level option



On 7/27/2020 10:25 PM, Vasundhara Volam wrote:
> On Mon, Jul 27, 2020 at 4:36 PM Moshe Shemesh <moshe@...lanox.com> wrote:
>>
>> Introduce new option on devlink reload API to enable the user to select the
>> reload level required. Complete support for all levels in mlx5.
>> The following reload levels are supported:
>>   driver: Driver entities re-instantiation only.
>>   fw_reset: Firmware reset and driver entities re-instantiation.
> The Name is a little confusing. I think it should be renamed to
> fw_live_reset (in which both firmware and driver entities are
> re-instantiated).  For only fw_reset, the driver should not undergo
> reset (it requires a driver reload for firmware to undergo reset).
> 

So, I think the differentiation here is that "live_patch" doesn't reset
anything.

>>   fw_live_patch: Firmware live patching only.
> This level is not clear. Is this similar to flashing??
> 
> Also I have a basic query. The reload command is split into
> reload_up/reload_down handlers (Please correct me if this behaviour is
> changed with this patchset). What if the vendor specific driver does
> not support up/down and needs only a single handler to fire a firmware
> reset or firmware live reset command?

In the "reload_down" handler, they would trigger the appropriate reset,
and quiesce anything that needs to be done. Then on reload up, it would
restore and bring up anything quiesced in the first stage.