netdev - Re: [PATCH net-next] net: cpsw: Don't handle SIOC[GS]HWTSTAMP when CPTS is disabled

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Date:   Thu, 31 Aug 2017 09:48:07 +0200
From:   Richard Cochran <richardcochran@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     stefan.sorensen@...ctralink.com, grygorii.strashko@...com,
        netdev@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH net-next] net: cpsw: Don't handle SIOC[GS]HWTSTAMP when
 CPTS is disabled

On Wed, Aug 30, 2017 at 02:47:45PM -0700, David Miller wrote:
> It should not be required to disable a Kconfig option just to get PHY
> timestamping to work properly.

Well, if the MAC driver handles the ioctl and enables time stamping,
then the PHY driver's time stamping remains disabled.  We don't have a
way to choose PHY time stamping at run time.

> Rather, if the CPTS code returns -EOPNOTSUPP we should try to
> fallthrough to the PHY library based methods.

I agree that it would be better for the core (rather than the
individual drivers) to handle this case.

There are a few callers of .ndo_do_ioctl to consider.  Besides
dev_ifsioc() there is at least vlan_dev_ioctl() that needs to handle
the EOPNOTSUPP.

Thanks,
Richard