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

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Message-ID: <20191108162828.6e12fc05.cohuck@redhat.com>
Date:   Fri, 8 Nov 2019 16:28:28 +0100
From:   Cornelia Huck <cohuck@...hat.com>
To:     Parav Pandit <parav@...lanox.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

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.