linux-kernel - Re: [PATCH v3 06/27] thunderbolt: Rework capability handling

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Message-ID: <20170605064230.GI3454@lahna.fi.intel.com>
Date:   Mon, 5 Jun 2017 09:42:30 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Lukas Wunner <lukas@...ner.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <yehezkel.bernat@...el.com>,
        Amir Levy <amir.jer.levy@...el.com>,
        Andy Lutomirski <luto@...nel.org>,
        Mario Limonciello <Mario.Limonciello@...l.com>,
        Jared.Dominguez@...l.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 06/27] thunderbolt: Rework capability handling

On Sun, Jun 04, 2017 at 09:15:03PM +0300, Andy Shevchenko wrote:
> On Sun, Jun 4, 2017 at 6:06 PM, Mika Westerberg
> <mika.westerberg@...ux.intel.com> wrote:
> > On Sun, Jun 04, 2017 at 06:00:02PM +0300, Mika Westerberg wrote:
> >> On Sun, Jun 04, 2017 at 03:52:29PM +0200, Lukas Wunner wrote:
> >> > On Fri, Jun 02, 2017 at 05:05:03PM +0300, Mika Westerberg wrote:
> >> > > Organization of the capabilities in switches and ports is not so random
> >> > > after all. Rework the capability handling functionality so that it
> >> > > follows how capabilities are organized and provide two new functions
> >> > > (tb_switch_find_vsec_cap() and tb_port_find_cap()) which can be used to
> >> >                   ^^^^^^^^
> >> >
> >> > I assume VSEC is the same acronym as in the PCIe spec, so this naming
> >> > scheme results in "vendor specific extended capability capability",
> >> > which is maybe a bit odd.
> >>
> >> AFAIK it comes from Vendor SpEcifiC but I'm not 100% sure ;-) The Alpine
> >> Ridge datasheet calls it also VSEC capability which is why we chose the
> >> naming accordingly.
> >
> > That said, it could also come from Vendor SpEcific Capability. I can
> > change it to tb_switch_find_vsec() if that works better.
> 
> I would folllow PCI existing namings, i.e.
> _vse_cap()

Indeed this sounds better.

I looked at the TBT specs again and they just use VSEC but do not open
the acronym any further. I guess the "Vendor Specific Extended
Capability" as Lukas pointed out is the correct one.

I'll change the patch to use tb_switch_find_vse_cap() and rename
TB_VSEC_CAP_* to TB_VSE_CAP_* if there are no objections.