linux-kernel - RE: linux-next: Tree for Aug 29 (mlx5)

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Date:   Thu, 29 Aug 2019 23:15:11 +0000
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     Saeed Mahameed <saeedm@...lanox.com>,
        "sfr@...b.auug.org.au" <sfr@...b.auug.org.au>,
        Eran Ben Elisha <eranbe@...lanox.com>,
        "linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
        "rdunlap@...radead.org" <rdunlap@...radead.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Leon Romanovsky <leonro@...lanox.com>
Subject: RE: linux-next: Tree for Aug 29 (mlx5)



> -----Original Message-----
> From: Saeed Mahameed <saeedm@...lanox.com>
> Sent: Thursday, August 29, 2019 4:04 PM
> To: sfr@...b.auug.org.au; Eran Ben Elisha <eranbe@...lanox.com>; linux-
> next@...r.kernel.org; rdunlap@...radead.org; Haiyang Zhang
> <haiyangz@...rosoft.com>
> Cc: linux-kernel@...r.kernel.org; netdev@...r.kernel.org; Leon
> Romanovsky <leonro@...lanox.com>
> Subject: Re: linux-next: Tree for Aug 29 (mlx5)
> 
> On Thu, 2019-08-29 at 21:48 +0000, Haiyang Zhang wrote:
> > > -----Original Message-----
> > > From: Saeed Mahameed <saeedm@...lanox.com>
> > > Sent: Thursday, August 29, 2019 2:32 PM
> > > To: sfr@...b.auug.org.au; Eran Ben Elisha <eranbe@...lanox.com>;
> > > linux-
> > > next@...r.kernel.org; rdunlap@...radead.org; Haiyang Zhang
> > > <haiyangz@...rosoft.com>
> > > Cc: linux-kernel@...r.kernel.org; netdev@...r.kernel.org; Leon
> > > Romanovsky <leonro@...lanox.com>
> > > Subject: Re: linux-next: Tree for Aug 29 (mlx5)
> > >
> > > On Thu, 2019-08-29 at 12:55 -0700, Randy Dunlap wrote:
> > > > On 8/29/19 12:54 PM, Randy Dunlap wrote:
> > > > > On 8/29/19 4:08 AM, Stephen Rothwell wrote:
> > > > > > Hi all,
> > > > > >
> > > > > > Changes since 20190828:
> > > > > >
> > > > >
> > > > > on x86_64:
> > > > > when CONFIG_PCI_HYPERV=m
> > > >
> > > > and CONFIG_PCI_HYPERV_INTERFACE=m
> > > >
> > >
> > > Haiyang and Eran, I think CONFIG_PCI_HYPERV_INTERFACE was never
> > > supposed to be a module ? it supposed to provide an always available
> > > interface to drivers ..
> > >
> > > Anyway, maybe we need to imply CONFIG_PCI_HYPERV_INTERFACE in
> mlx5.
> >
> > The symbolic dependency by driver mlx5e,  automatically triggers
> > loading of pci_hyperv_interface module. And this module can be loaded
> > in any platforms.
> >
> 
> This only works when both are modules.
> 
> 
> > Currently, mlx5e driver has #if
> > IS_ENABLED(CONFIG_PCI_HYPERV_INTERFACE)
> > around the code using the interface.
> >
> > I agree --
> > Adding "select PCI_HYPERV_INTERFACE" for mlx5e will clean up these
> > #if's.
> >
> 
> No, not "select", "imply".
> 
> if one wants PCI_HYPERV_INTERFACE off, imply will keep it off for you.

This looks good.

- Haiyang