linux-kernel - RE: [PATCH v2 0/2] Simplify mtty driver and mdev core

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Message-ID: <AM0PR05MB48666AE325759E51D0737F04D1A70@AM0PR05MB4866.eurprd05.prod.outlook.com>
Date:   Sat, 24 Aug 2019 04:45:25 +0000
From:   Parav Pandit <parav@...lanox.com>
To:     Parav Pandit <parav@...lanox.com>,
        Alex Williamson <alex.williamson@...hat.com>
CC:     Jiri Pirko <jiri@...nulli.us>, Jiri Pirko <jiri@...lanox.com>,
        "David S . Miller" <davem@...emloft.net>,
        Kirti Wankhede <kwankhede@...dia.com>,
        Cornelia Huck <cohuck@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        cjia <cjia@...dia.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH v2 0/2] Simplify mtty driver and mdev core

Hi Alex,

> -----Original Message-----
> From: linux-kernel-owner@...r.kernel.org <linux-kernel-
> owner@...r.kernel.org> On Behalf Of Parav Pandit
> Sent: Saturday, August 24, 2019 9:26 AM
> To: Alex Williamson <alex.williamson@...hat.com>
> Cc: Jiri Pirko <jiri@...nulli.us>; Jiri Pirko <jiri@...lanox.com>; David S .
> Miller <davem@...emloft.net>; Kirti Wankhede <kwankhede@...dia.com>;
> Cornelia Huck <cohuck@...hat.com>; kvm@...r.kernel.org; linux-
> kernel@...r.kernel.org; cjia <cjia@...dia.com>; netdev@...r.kernel.org
> Subject: RE: [PATCH v2 0/2] Simplify mtty driver and mdev core
> > I don't understand this logic.  I'm simply asking that we have a way
> > to test the collision behavior without changing the binary.  The path
> > we're driving towards seems to be making this easier and easier.  If
> > the vendor can request an alias of a specific length, then a sample
> > driver with a module option to set the desired alias length to 1-char makes
> it trivially easy to induce a collision.
> Sure it is easy to test collision, but my point is - mdev core is not sha1 test
> module.
> Hence adding functionality of variable alias length to test collision doesn't
> make sense.
> When the actual user arrives who needs small alias, we will be able to add
> additional pieces very easily.

My initial thoughts to add parent_ops to have bool flag to generate alias or not.
However, instead of bool, keeping it unsigned int to say, zero to skip alias and non-zero length to convey generate alias.
This will serve both the purpose with trivial handling.