netdev - Re: [PATCH iwl-next v4 00/15] Introduce Intel IDPF driver

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Message-ID: <bb44cf67-3b8c-7cc2-b48e-438cc9af5fdb@intel.com>
Date: Fri, 19 May 2023 10:36:00 -0700
From: "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
CC: Emil Tantilov <emil.s.tantilov@...el.com>,
	<intel-wired-lan@...ts.osuosl.org>, <shannon.nelson@....com>,
	<simon.horman@...igine.com>, <leon@...nel.org>, <decot@...gle.com>,
	<willemb@...gle.com>, <jesse.brandeburg@...el.com>,
	<anthony.l.nguyen@...el.com>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <netdev@...r.kernel.org>, "Singhai,
 Anjali" <anjali.singhai@...el.com>, "Orr, Michael" <michael.orr@...el.com>
Subject: Re: [PATCH iwl-next v4 00/15] Introduce Intel IDPF driver



On 5/18/2023 10:49 PM, Michael S. Tsirkin wrote:
> On Thu, May 18, 2023 at 04:26:24PM -0700, Samudrala, Sridhar wrote:
>>
>>
>> On 5/18/2023 10:10 AM, Michael S. Tsirkin wrote:
>>> On Thu, May 18, 2023 at 09:19:31AM -0700, Samudrala, Sridhar wrote:
>>>>
>>>>
>>>> On 5/11/2023 11:34 PM, Michael S. Tsirkin wrote:
>>>>> On Mon, May 08, 2023 at 12:43:11PM -0700, Emil Tantilov wrote:
>>>>>> This patch series introduces the Intel Infrastructure Data Path Function
>>>>>> (IDPF) driver. It is used for both physical and virtual functions. Except
>>>>>> for some of the device operations the rest of the functionality is the
>>>>>> same for both PF and VF. IDPF uses virtchnl version2 opcodes and
>>>>>> structures defined in the virtchnl2 header file which helps the driver
>>>>>> to learn the capabilities and register offsets from the device
>>>>>> Control Plane (CP) instead of assuming the default values.
>>>>>
>>>>> So, is this for merge in the next cycle?  Should this be an RFC rather?
>>>>> It seems unlikely that the IDPF specification will be finalized by that
>>>>> time - how are you going to handle any specification changes?
>>>>
>>>> Yes. we would like this driver to be merged in the next cycle(6.5).
>>>> Based on the community feedback on v1 version of the driver, we removed all
>>>> references to OASIS standard and at this time this is an intel vendor
>>>> driver.
>>>>
>>>> Links to v1 and v2 discussion threads
>>>> https://lore.kernel.org/netdev/20230329140404.1647925-1-pavan.kumar.linga@intel.com/
>>>> https://lore.kernel.org/netdev/20230411011354.2619359-1-pavan.kumar.linga@intel.com/
>>>>
>>>> The v1->v2 change log reflects this update.
>>>> v1 --> v2: link [1]
>>>>    * removed the OASIS reference in the commit message to make it clear
>>>>      that this is an Intel vendor specific driver
>>>
>>> Yes this makes sense.
>>>
>>>
>>>> Any IDPF specification updates would be handled as part of the changes that
>>>> would be required to make this a common standards driver.
>>>
>>>
>>> So my question is, would it make sense to update Kconfig and module name
>>> to be "ipu" or if you prefer "intel-idpf" to make it clear this is
>>> currently an Intel vendor specific driver?  And then when you make it a
>>> common standards driver rename it to idpf?  The point being to help make
>>> sure users are not confused about whether they got a driver with
>>> or without IDPF updates. It's not critical I guess but seems like a good
>>> idea. WDYT?
>>
>> It would be more disruptive to change the name of the driver. We can update
>> the pci device table, module description and possibly driver version when we
>> are ready to make this a standard driver.
>> So we would prefer not changing the driver name.
> 
> Kconfig entry and description too?
> 

The current Kconfig entry has Intel references.

+config IDPF
+	tristate "Intel(R) Infrastructure Data Path Function Support"
+	depends on PCI_MSI
+	select DIMLIB
+	help
+	  This driver supports Intel(R) Infrastructure Processing Unit (IPU)
+	  devices.

It can be updated with Intel references removed when the spec becomes 
standard and meets the community requirements.