linux-kernel - RE: [PATCH v2] uio: dfl: add HSSI feature id

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Date:   Tue, 26 Apr 2022 10:54:10 -0700 (PDT)
From:   matthew.gerlach@...ux.intel.com
To:     "Wu, Hao" <hao.wu@...el.com>
cc:     "Zhang, Tianfei" <tianfei.zhang@...el.com>,
        "trix@...hat.com" <trix@...hat.com>,
        "mdf@...nel.org" <mdf@...nel.org>,
        "Xu, Yilun" <yilun.xu@...el.com>,
        "linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2] uio: dfl: add HSSI feature id



On Tue, 26 Apr 2022, Wu, Hao wrote:

>>>>> -----Original Message-----
>>>>> From: Zhang, Tianfei <tianfei.zhang@...el.com>
>>>>> Sent: Tuesday, April 12, 2022 2:24 PM
>>>>> To: Wu, Hao <hao.wu@...el.com>; trix@...hat.com; mdf@...nel.org; Xu,
>>>>> Yilun <yilun.xu@...el.com>; linux-fpga@...r.kernel.org;
>>>>> gregkh@...uxfoundation.org
>>>>> Cc: linux-kernel@...r.kernel.org; Matthew Gerlach
>>>>> <matthew.gerlach@...ux.intel.com>; Zhang, Tianfei
>>>>> <tianfei.zhang@...el.com>
>>>>> Subject: [PATCH v2] uio: dfl: add HSSI feature id
>>>>>
>>>>> From: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
>>>>>
>>>>> Add the feature id of the OFS HSSI (High Speed Serial Interface)
>>>>
>>>> We still don't see any description on what OFS is here, or will OFS be added to
>>>> title as well? we don't expect another submission with the same title but for
>> XXX
>>>> HSSI again.
>>>
>>> This name of HSSI module in dfl feature id table is : OFS HSSI subsystem.
>>>
>>> How about this tile:
>>> uio: dfl: add OFS HSSI device id
>>>
>>> Add OFS HSSI (Open FPGA Stack High Speed Serial Interface) device ID in
>> uio_dfl driver for Intel PAC N6000 Card.
>>
>> Hi Tianfei,
>>
>> In the Platform Designer tool, this IP block is referred to as the HSSI
>> Subsystem.  I think we should use the same name here.  Additionally, this
>> subsystem is already in use in multiple cards; so I suggest dropping
>> any reference to a particular card.
>
> The only concern is that there are 4 HSSI in the feature id table.
> Without any prefix, it may confuse people.
> https://github.com/OPAE/dfl-feature-id

Hi Hao,

Good point about the possible confusion of 4 HSSI implementations 
mentioned in the table.  I have submitted a pull request adding clarity to 
the table:

https://github.com/OPAE/dfl-feature-id/pull/1

Matthew

>
>>
>> Matthew
>>
>>>
>>>>
>>>>> subsystem to table of ids supported by the uio_dfl driver. HSSI
>>>>> subsystem consists of harden/soft Ethernet MAC to support various
>>>>> ethernet usages and PCS/FEC/PMA direct modes for non-ethernet usages.
>>>>>
>>>>> We leverage the uio_dfl driver to access the HSSI subsystem on user
>>>>> space, because the HSSI subsystem was designed for specific purposes
>>>>> and does not fit into the standard MAC and net kernel subsystems.
>>>>>
>>>>> The Feature ID table of DFL can be found:
>>>>> https://github.com/OPAE/dfl-feature-id
>>>>
>>>> Why you put it here? even this link there is no more descriptions to
>> understand
>>>> what it is. Or can be removed here.
>>>
>>> Yes, I agree, I will remove it.
>>>>
>>>>>
>>>>> Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
>>>>> Signed-off-by: Tianfei Zhang <tianfei.zhang@...el.com>
>>>>> ---
>>>>> v2: add HSSI introduction and the git repo of Feature ID table.
>>>>> ---
>>>>>  drivers/uio/uio_dfl.c | 2 ++
>>>>>  1 file changed, 2 insertions(+)
>>>>>
>>>>> diff --git a/drivers/uio/uio_dfl.c b/drivers/uio/uio_dfl.c index
>>>>> 89c0fc7b0cbc..660e1d0bf6b9 100644
>>>>> --- a/drivers/uio/uio_dfl.c
>>>>> +++ b/drivers/uio/uio_dfl.c
>>>>> @@ -45,9 +45,11 @@ static int uio_dfl_probe(struct dfl_device *ddev)
>>>>> }
>>>>>
>>>>>  #define FME_FEATURE_ID_ETH_GROUP	0x10
>>>>> +#define FME_FEATURE_ID_OFS_HSSI		0x15
>>>>>
>>>>>  static const struct dfl_device_id uio_dfl_ids[] = {
>>>>>  	{ FME_ID, FME_FEATURE_ID_ETH_GROUP },
>>>>> +	{ FME_ID, FME_FEATURE_ID_OFS_HSSI },
>>>>>  	{ }
>>>>>  };
>>>>>  MODULE_DEVICE_TABLE(dfl, uio_dfl_ids);
>>>>> --
>>>>> 2.26.2
>>>
>>>
>