netdev - Re: [PATCH v5] net: dummy: Introduce dummy virtual functions

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Message-Id: <20161221.133200.173665554896949124.davem@davemloft.net>
Date:   Wed, 21 Dec 2016 13:32:00 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     phil@....cc
Cc:     netdev@...r.kernel.org, sd@...asysnail.net
Subject: Re: [PATCH v5] net: dummy: Introduce dummy virtual functions

From: Phil Sutter <phil@....cc>
Date: Tue, 20 Dec 2016 23:26:21 +0100

> The idea for this was born when testing VF support in iproute2 which was
> impeded by hardware requirements. In fact, not every VF-capable hardware
> driver implements all netdev ops, so testing the interface is still hard
> to do even with a well-sorted hardware shelf.
> 
> To overcome this and allow for testing the user-kernel interface, this
> patch allows to turn dummy into a PF with a configurable amount of VFs.
> 
> Due to the assumption that all PFs are PCI devices, this implementation
> is not completely straightforward: In order to allow for
> rtnl_fill_ifinfo() to see the dummy VFs, a fake PCI parent device is
> attached to the dummy netdev. This has to happen at the right spot so
> register_netdevice() does not get confused. This patch abuses
> ndo_fix_features callback for that. In ndo_uninit callback, the fake
> parent is removed again for the same purpose.
> 
> Joint work with Sabrina Dubroca.
> 
> Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
> Signed-off-by: Phil Sutter <phil@....cc>

Please resubmit when net-next opens back up, thanks.