netdev - RE: [PATCH net 03/13] mv88e6xxx: reject unsupported external timestamp flags

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Date:   Thu, 14 Nov 2019 19:08:16 +0000
From:   "Keller, Jacob E" <jacob.e.keller@...el.com>
To:     Richard Cochran <richardcochran@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        David Miller <davem@...emloft.net>,
        Brandon Streiff <brandon.streiff@...com>,
        "Hall, Christopher S" <christopher.s.hall@...el.com>,
        Eugenia Emantayev <eugenia@...lanox.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        "Feras Daoud" <ferasda@...lanox.com>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Stefan Sorensen <stefan.sorensen@...ctralink.com>
Subject: RE: [PATCH net 03/13] mv88e6xxx: reject unsupported external
 timestamp flags

> -----Original Message-----
> From: Richard Cochran <richardcochran@...il.com>
> Sent: Thursday, November 14, 2019 10:45 AM
> To: netdev@...r.kernel.org
> Cc: intel-wired-lan@...ts.osuosl.org; David Miller <davem@...emloft.net>;
> Brandon Streiff <brandon.streiff@...com>; Hall, Christopher S
> <christopher.s.hall@...el.com>; Eugenia Emantayev <eugenia@...lanox.com>;
> Felipe Balbi <felipe.balbi@...ux.intel.com>; Feras Daoud
> <ferasda@...lanox.com>; Keller, Jacob E <jacob.e.keller@...el.com>; Kirsher,
> Jeffrey T <jeffrey.t.kirsher@...el.com>; Sergei Shtylyov
> <sergei.shtylyov@...entembedded.com>; Stefan Sorensen
> <stefan.sorensen@...ctralink.com>
> Subject: [PATCH net 03/13] mv88e6xxx: reject unsupported external timestamp
> flags
> 
> From: Jacob Keller <jacob.e.keller@...el.com>
> 
> Fix the mv88e6xxx PTP support to explicitly reject any future flags that
> get added to the external timestamp request ioctl.
> 
> In order to maintain currently functioning code, this patch accepts all
> three current flags. This is because the PTP_RISING_EDGE and
> PTP_FALLING_EDGE flags have unclear semantics and each driver seems to
> have interpreted them slightly differently.
> 
> For the record, the semantics of this driver are:
> 
>   flags                                                 Meaning
>   ----------------------------------------------------  --------------------------
>   PTP_ENABLE_FEATURE                                    Time stamp falling edge

For the new version of the ioctl this isn't possible, but we still support the v1 ioctl which would still have this mode. Ok.

>   PTP_ENABLE_FEATURE|PTP_RISING_EDGE                    Time stamp rising edge
>   PTP_ENABLE_FEATURE|PTP_FALLING_EDGE                   Time stamp falling edge
>   PTP_ENABLE_FEATURE|PTP_RISING_EDGE|PTP_FALLING_EDGE   Time stamp
> rising edge
> 

Thanks,
Jake