netdev - RE: [PATCH net-next 19/19] mtty: Optionally support mtty alias

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Message-ID: <AM0PR05MB486622134AD1F1A83714629CD17B0@AM0PR05MB4866.eurprd05.prod.outlook.com>
Date:   Fri, 8 Nov 2019 15:30:59 +0000
From:   Parav Pandit <parav@...lanox.com>
To:     Cornelia Huck <cohuck@...hat.com>
CC:     "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Saeed Mahameed <saeedm@...lanox.com>,
        "kwankhede@...dia.com" <kwankhede@...dia.com>,
        "leon@...nel.org" <leon@...nel.org>,
        Jiri Pirko <jiri@...lanox.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: RE: [PATCH net-next 19/19] mtty: Optionally support mtty alias



> -----Original Message-----
> From: Cornelia Huck <cohuck@...hat.com>
> Sent: Friday, November 8, 2019 9:28 AM
> To: Parav Pandit <parav@...lanox.com>
> Cc: alex.williamson@...hat.com; davem@...emloft.net;
> kvm@...r.kernel.org; netdev@...r.kernel.org; Saeed Mahameed
> <saeedm@...lanox.com>; kwankhede@...dia.com; leon@...nel.org; Jiri
> Pirko <jiri@...lanox.com>; linux-rdma@...r.kernel.org
> Subject: Re: [PATCH net-next 19/19] mtty: Optionally support mtty alias
> 
> On Fri, 8 Nov 2019 15:10:42 +0000
> Parav Pandit <parav@...lanox.com> wrote:
> 
> > > -----Original Message-----
> > > From: Cornelia Huck <cohuck@...hat.com>
> > > Sent: Friday, November 8, 2019 7:46 AM
> > > To: Parav Pandit <parav@...lanox.com>
> > > Cc: alex.williamson@...hat.com; davem@...emloft.net;
> > > kvm@...r.kernel.org; netdev@...r.kernel.org; Saeed Mahameed
> > > <saeedm@...lanox.com>; kwankhede@...dia.com; leon@...nel.org; Jiri
> > > Pirko <jiri@...lanox.com>; linux-rdma@...r.kernel.org
> > > Subject: Re: [PATCH net-next 19/19] mtty: Optionally support mtty
> > > alias
> > >
> > > On Thu,  7 Nov 2019 10:08:34 -0600
> > > Parav Pandit <parav@...lanox.com> wrote:
> > >
> > > > Provide a module parameter to set alias length to optionally
> > > > generate mdev alias.
> > > >
> > > > Example to request mdev alias.
> > > > $ modprobe mtty alias_length=12
> > > >
> > > > Make use of mtty_alias() API when alias_length module parameter is
> set.
> > > >
> > > > Signed-off-by: Parav Pandit <parav@...lanox.com>
> > > > ---
> > > >  samples/vfio-mdev/mtty.c | 13 +++++++++++++
> > > >  1 file changed, 13 insertions(+)
> > >
> > > If you already have code using the alias interface, you probably
> > > don't need to add it to the sample driver here. Especially as the
> > > alias looks kind of pointless here.
> >
> > It is pointless.
> > Alex point when we ran through the series in August, was, QA should be
> able to do cover coverage of mdev_core where there is mdev collision and
> mdev_create() can fail.
> > And QA should be able to set alias length to be short to 1 or 2 letters to
> trigger it.
> > Hence this patch was added.
> 
> If we want this for testing purposes, that should be spelled out explicitly (the
> above had already dropped from my cache). Even better if we had
> something in actual test infrastructure.

What else purpose sample driver has other than getting reference on how to use API? :-)