netdev - Re: [net-next v3 3/7] mv88e6xxx: reject unsupported external timestamp flags

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Date:   Sat, 12 Oct 2019 16:27:19 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     "Keller, Jacob E" <jacob.e.keller@...el.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Intel Wired LAN <intel-wired-lan@...ts.osuosl.org>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
        Brandon Streiff <brandon.streiff@...com>
Subject: Re: [net-next v3 3/7] mv88e6xxx: reject unsupported external
 timestamp flags

On Sat, Oct 12, 2019 at 07:36:31PM +0000, Keller, Jacob E wrote:
> Right, so in practice, unless it supports both edges, it should reject setting both RISING and FALLING together.

Enforcing that now *could* break existing user space, but I wonder
whether any programs would actually be affected.

Maybe we can add a STRICT flag than requests strict checking.  If user
space uses the "2" ioctl, then we would add this flag before invoking
the driver callback.

Thanks,
Richard