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

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Date:   Tue, 26 Apr 2022 02:31:33 +0000
From:   "Wu, Hao" <hao.wu@...el.com>
To:     "matthew.gerlach@...ux.intel.com" <matthew.gerlach@...ux.intel.com>,
        "Zhang, Tianfei" <tianfei.zhang@...el.com>
CC:     "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

> >>> -----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

> 
> 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
> >
> >