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

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Date:   Tue, 19 Apr 2022 10:52:05 -0700 (PDT)
From:   matthew.gerlach@...ux.intel.com
To:     "Zhang, Tianfei" <tianfei.zhang@...el.com>
cc:     "Wu, Hao" <hao.wu@...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, 19 Apr 2022, Zhang, Tianfei 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.

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
>
>