netdev - Re: [PATCH net-next v2 01/15] virtchnl: add virtchnl version 2 ops

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Date:   Wed, 12 Apr 2023 14:38:55 -0700
From:   "Tantilov, Emil S" <emil.s.tantilov@...el.com>
To:     Simon Horman <simon.horman@...igine.com>,
        Pavan Kumar Linga <pavan.kumar.linga@...el.com>
CC:     <intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>,
        <joshua.a.hay@...el.com>, <sridhar.samudrala@...el.com>,
        <jesse.brandeburg@...el.com>, <anthony.l.nguyen@...el.com>,
        <willemb@...gle.com>, <decot@...gle.com>, <pabeni@...hat.com>,
        <kuba@...nel.org>, <edumazet@...gle.com>, <davem@...emloft.net>,
        Alan Brady <alan.brady@...el.com>,
        Madhu Chittim <madhu.chittim@...el.com>,
        Phani Burra <phani.r.burra@...el.com>
Subject: Re: [PATCH net-next v2 01/15] virtchnl: add virtchnl version 2 ops



On 4/11/2023 1:51 AM, Simon Horman wrote:
> On Mon, Apr 10, 2023 at 06:13:40PM -0700, Pavan Kumar Linga wrote:
>> Virtchnl version 1 is an interface used by the current generation of
>> foundational NICs to negotiate the capabilities and configure the
>> HW resources such as queues, vectors, RSS LUT, etc between the PF
>> and VF drivers. It is not extensible to enable new features supported
>> in the next generation of NICs/IPUs and to negotiate descriptor types,
>> packet types and register offsets.
>>
>> To overcome the limitations of the existing interface, introduce
>> the virtchnl version 2 and add the necessary opcodes, structures,
>> definitions, and descriptor formats. The driver also learns the
>> data queue and other register offsets to use instead of hardcoding
>> them. The advantage of this approach is that it gives the flexibility
>> to modify the register offsets if needed, restrict the use of
>> certain descriptor types and negotiate the supported packet types.
>>
>> Co-developed-by: Alan Brady <alan.brady@...el.com>
>> Signed-off-by: Alan Brady <alan.brady@...el.com>
>> Co-developed-by: Joshua Hay <joshua.a.hay@...el.com>
>> Signed-off-by: Joshua Hay <joshua.a.hay@...el.com>
>> Co-developed-by: Madhu Chittim <madhu.chittim@...el.com>
>> Signed-off-by: Madhu Chittim <madhu.chittim@...el.com>
>> Co-developed-by: Phani Burra <phani.r.burra@...el.com>
>> Signed-off-by: Phani Burra <phani.r.burra@...el.com>
>> Co-developed-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
>> Signed-off-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
>> Signed-off-by: Pavan Kumar Linga <pavan.kumar.linga@...el.com>
>> Reviewed-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
>> Reviewed-by: Willem de Bruijn <willemb@...gle.com>
>> ---
>>   drivers/net/ethernet/intel/idpf/virtchnl2.h   | 1201 +++++++++++++++++
>>   .../ethernet/intel/idpf/virtchnl2_lan_desc.h  |  666 +++++++++
>>   2 files changed, 1867 insertions(+)
>>   create mode 100644 drivers/net/ethernet/intel/idpf/virtchnl2.h
>>   create mode 100644 drivers/net/ethernet/intel/idpf/virtchnl2_lan_desc.h
>>
>> diff --git a/drivers/net/ethernet/intel/idpf/virtchnl2.h b/drivers/net/ethernet/intel/idpf/virtchnl2.h
> 
> ...
> 
>> +/**
>> + * This macro is used to generate compilation errors if a structure
>> + * is not exactly the correct length.
>> + */
> 
> Hi Pavan,
> 
> ./scripts/kernel-doc -none drivers/net/ethernet/intel/idpf/virtchnl2.h
> reports that the comment above starts with '/**' but is not a kernel-doc
> comment. Which seems to be correct. It also flags many other similar issues.
> 
> Please consider running kernel-doc and resolving the issues it flags.

Will address in v3. Thanks for the tip!

Emil