linux-kernel - Re: [PATCH net-next v2] ethernet/intel: fix PTP_1588

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Message-ID: <20210803000304.GA19119@hoboy.vegasvil.org>
Date:   Mon, 2 Aug 2021 17:03:04 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     "Keller, Jacob E" <jacob.e.keller@...el.com>
Cc:     Nicolas Pitre <nico@...xnic.net>, Arnd Bergmann <arnd@...nel.org>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        "Saleem, Shiraz" <shiraz.saleem@...el.com>,
        "Ertman, David M" <david.m.ertman@...el.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v2] ethernet/intel: fix PTP_1588_CLOCK
 dependencies

On Mon, Aug 02, 2021 at 11:45:09PM +0000, Keller, Jacob E wrote:
> Ok, so basically: if any driver that needs PTP core is on, PTP core is on, with no way to disable it.

Right.  Some MAC drivers keep the PTP stuff under a second Kconfig option.

IIRC, we (davem and netdev) decided not to do that going forwards.  If
a MAC has PTP features, then users will sure want it enabled.

So, let the MACs use "depends" or "select" PTP core.  I guess that
"select" is more user friendly.

And Posix timers: never disable this.  After all, who wants an
embedded system without timer_create()?  Seriously?

Thanks,
Richard