netdev - RE: [PATCH] revert async probing of VMBus network devices.

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Message-ID: <DM6PR21MB13371A9EEDB55BFF96B8CA7BCA160@DM6PR21MB1337.namprd21.prod.outlook.com>
Date:   Wed, 5 Jun 2019 18:54:18 +0000
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     Stephen Hemminger <stephen@...workplumber.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        Stephen Hemminger <sthemmin@...rosoft.com>
Subject: RE: [PATCH] revert async probing of VMBus network devices.



> -----Original Message-----
> From: linux-hyperv-owner@...r.kernel.org <linux-hyperv-
> owner@...r.kernel.org> On Behalf Of Stephen Hemminger
> Sent: Wednesday, June 5, 2019 2:51 PM
> To: netdev@...r.kernel.org
> Cc: linux-hyperv@...r.kernel.org; Stephen Hemminger
> <sthemmin@...rosoft.com>
> Subject: [PATCH] revert async probing of VMBus network devices.
> 
> Doing asynchronous probing can lead to reordered network device names.
> And because udev doesn't have any useful information to construct a
> persistent name, this causes VM's to sporadically boot with reordered device
> names and no connectivity.
> 
> This shows up on the Ubuntu image on larger VM's where 30% of the time
> eth0 and eth1 get swapped.
> 
> Note: udev MAC address policy is disabled on Azure images because the
> netvsc and PCI VF will have the same mac address.
> 
> Fixes: af0a5646cb8d ("use the new async probing feature for the hyperv
> drivers")
> Signed-off-by: Stephen Hemminger <sthemmin@...rosoft.com>
> ---

Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>