netdev - Re: [PATCH net-next 0/4] bnxt_en: Add new "enable_hot_fw

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Message-ID: <20200519132010.GH4655@nanopsycho>
Date:   Tue, 19 May 2020 15:25:02 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Vasundhara Volam <vasundhara-v.volam@...adcom.com>
Cc:     Michael Chan <michael.chan@...adcom.com>,
        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 12:50:14PM CEST, vasundhara-v.volam@...adcom.com wrote:
>On Tue, May 19, 2020 at 3:11 PM Jiri Pirko <jiri@...nulli.us> wrote:
>>
>> Tue, May 19, 2020 at 10:41:44AM CEST, michael.chan@...adcom.com wrote:
>> >On Tue, May 19, 2020 at 12:30 AM Jiri Pirko <jiri@...nulli.us> wrote:
>> >>
>> >> Tue, May 19, 2020 at 07:43:01AM CEST, vasundhara-v.volam@...adcom.com wrote:
>> >> >On Tue, May 19, 2020 at 10:57 AM Jiri Pirko <jiri@...nulli.us> wrote:
>> >> >>
>> >> >> I don't follow, sorry. Could you be more verbose about what you are
>> >> >> trying to achieve here?
>> >> >As mentioned below, hot_fw_reset is a device capability similar to roce.
>> >> >Capability can be enabled or disabled on the device, if the device supports.
>> >> >When enabled and if supported firmware and driver are loaded, user can
>> >> >utilise the capability to fw_reset or fw_live_patch.
>> >>
>> >> I don't undestand what exactly is this supposed to enable/disable. Could
>> >> you be more specific?
>> >
>> >Let me see if I can help clarify.  Here's a little background.  Hot
>> >reset is a feature supported by the firmware and requires the
>> >coordinated support of all function drivers.  The firmware will only
>> >initiate this hot reset when all function drivers can support it.  For
>> >example, if one function is running a really old driver that doesn't
>> >support it, the firmware will not support this until this old driver
>> >gets unloaded or upgraded.  Until then, a PCI reset is needed to reset
>> >the firmware.
>> >
>> >Now, let's say one function driver that normally supports this
>> >firmware hot reset now wants to disable this feature.  For example,
>> >the function is running a mission critical application and does not
>> >want any hot firmware reset that may cause a hiccup during this time.
>> >It will use this devlink parameter to disable it.  When the critical
>> >app is done, it can then re-enable the parameter.  Of course other
>> >functions can also disable it and it is only enabled when all
>> >functions have enabled it.
>> >
>> >Hope this clarifies it.  Thanks.
>>
>> Okay. So this is about the "allowing to be reseted from the outside".
>> I see. For that I think it makes sense to have the devlink param.
>
>> However, I think that it would be fine to find more suitable name and
>> describe this properly in the docs.
>>
>I felt enable_hot_fw_reset is a self-descriptive name.
>
>But to make it more common, is the name enable_live_fw_reset good?
>or simply fw_reset?

I think it is important to emhasize that this setting is related to
"remote" reset.


>
>Thanks.