netdev - Re: [RFC 0/6] Regressions for "imply" behavior change

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Date:   Thu, 16 Apr 2020 03:25:21 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "arnd@...db.de" <arnd@...db.de>
CC:     "narmstrong@...libre.com" <narmstrong@...libre.com>,
        "masahiroy@...nel.org" <masahiroy@...nel.org>,
        "Laurent.pinchart@...asonboard.com" 
        <Laurent.pinchart@...asonboard.com>,
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        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "nico@...xnic.net" <nico@...xnic.net>,
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        <kieran.bingham+renesas@...asonboard.com>,
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        "jonas@...boo.se" <jonas@...boo.se>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "jgg@...pe.ca" <jgg@...pe.ca>,
        "jernej.skrabec@...l.net" <jernej.skrabec@...l.net>
Subject: Re: [RFC 0/6] Regressions for "imply" behavior change

On Tue, 2020-04-14 at 20:47 +0200, Arnd Bergmann wrote:
> On Tue, Apr 14, 2020 at 7:49 PM Saeed Mahameed <saeedm@...lanox.com>
> wrote:
> > On Tue, 2020-04-14 at 17:25 +0200, Arnd Bergmann wrote:
> > > On Tue, Apr 14, 2020 at 5:23 PM Jason Gunthorpe <jgg@...pe.ca>
> > > wrote:
> > > Correct.
> > > 
> > 
> > Great !
> > 
> > Then bottom line we will change mlx5/Kconfig: to
> > 
> > depends on VXLAN || !VXLAN
> 
> Ok
> 

BTW how about adding a new Kconfig option to hide the details of 
( BAR || !BAR) ? as Jason already explained and suggested, this will
make it easier for the users and developers to understand the actual
meaning behind this tristate weird condition.

e.g have a new keyword:
     reach VXLAN
which will be equivalent to: 
     depends on VXLAN && !VXLAN

> > This will force MLX5_CORE to m when necessary to make vxlan
> > reachable
> > to mlx5_core.  So no need for explicit use of IS_REACHABLE().
> > in mlx5 there are 4 of these:
> > 
> >         imply PTP_1588_CLOCK
> >         imply VXLAN
> >         imply MLXFW
> >         imply PCI_HYPERV_INTERFACE
> 
> As mentioned earlier, we do need to replace the 'imply
> PTP_1588_CLOCK'
> with the same
> 
>          depends on PTP_1588_CLOCK || !PTP_1588_CLOCK
> 
> So far I have not seen problems for the other two options, so I
> assume they
> are fine for now -- it seems to build just fine without
> PCI_HYPERV_INTERFACE,
> and MLXFW has no other dependencies, meaning that 'imply' is the
> same as 'select' here. Using 'select MLXFW' would make it clearer
> perhaps.

No, I would like to avoid select and allow building mlx5 without MLXFW,
MLXFW already has a stub protected with IS_REACHABLE(), this is why we
don't have an issue with it.


> 
>       Arnd