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Date:   Tue, 19 May 2020 07:27:45 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Vasundhara Volam <vasundhara-v.volam@...adcom.com>
Cc:     David Miller <davem@...emloft.net>, Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 0/4] bnxt_en: Add new "enable_hot_fw_reset"
 generic devlink parameter

Tue, May 19, 2020 at 06:31:27AM CEST, vasundhara-v.volam@...adcom.com wrote:
>On Mon, May 18, 2020 at 4:31 PM Jiri Pirko <jiri@...nulli.us> wrote:
>>
>> Mon, May 18, 2020 at 10:27:15AM CEST, vasundhara-v.volam@...adcom.com wrote:
>> >This patchset adds support for a "enable_hot_fw_reset" generic devlink
>> >parameter and use it in bnxt_en driver.
>> >
>> >Also, firmware spec. is updated to 1.10.1.40.
>>
>> Hi.
>>
>> We've been discussing this internally for some time.
>> I don't like to use params for this purpose.
>> We already have "devlink dev flash" and "devlink dev reload" commands.
>> Combination of these two with appropriate attributes should provide what
>> you want. The "param" you are introducing is related to either "flash"
>> or "reload", so I don't think it is good to have separate param, when we
>> can extend the command attributes.
>>
>> How does flash&reload work for mlxsw now:
>>
>> # devlink flash
>> Now new version is pending, old FW is running
>> # devlink reload
>> Driver resets the device, new FW is loaded
>>
>> I propose to extend reload like this:
>>
>>  devlink dev reload DEV [ level { driver-default | fw-reset | driver-only | fw-live-patch } ]
>>    driver-default - means one of following to, according to what is
>>                     default for the driver
>>    fw-reset - does FW reset and driver entities re-instantiation
>>    driver-only - does driver entities re-instantiation only
>>    fw-live-patch - does only FW live patching - no effect on kernel
>>
>> Could be an enum or bitfield. Does not matter. The point is to use
>> reload with attribute to achieve what user wants. In your usecase, user
>> would do:
>>
>> # devlink flash
>> # devlink reload level fw-live-patch
>
>Jiri,
>
>I am adding this param to control the fw hot reset capability of the device.

I don't follow, sorry. Could you be more verbose about what you are
trying to achieve here?


>Permanent configuration mode will toggle the NVM config space which is
>very similar to enable_roce/enable_sriov param and runtime configuration
>mode will toggle the driver level knob to avoid/allow fw-live-reset.
>
>>From above. I see that you are suggesting how to trigger the fw hot reset.
>This is good to have, but does not serve the purpose of enabling or disabling
>of the feature. Our driver is currently using "ethtool --reset" for
>triggering fw-reset
>or fw-live-patch.
>
>Thanks,
>Vasundhara

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