From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH v2] devargs: add blacklisting by linux
 interface name
Date: Thu, 5 Nov 2015 11:23:58 -0800
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To: "Charles (Chas) Williams" <3chas3@gmail.com>
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On Thu, 05 Nov 2015 11:39:04 -0500
"Charles (Chas) Williams" <3chas3@gmail.com> wrote:

> On Wed, 2015-11-04 at 23:40 +0100, Thomas Monjalon wrote:
> > 2015-10-14 09:41, Charles  Williams:  
> > > On Tue, 2015-10-13 at 14:49 +0200, Olivier MATZ wrote:  
> > > > For PCI devices that have several interfaces (I think it's the case for
> > > > some Mellanox boards), maybe we should not store the interface name?  
> > > 
> > > I am not sure what you mean here.  If a device has multiple ethernet
> > > interfaces, then it should a have seperate PCI device address space for
> > > each interface (I dont know of any DPDK drivers that don't make this
> > > assumption as well).  
> > 
> > mlx4 and cxgbe?  
> 
> OK, I see now.  I don't know of a way to tell if a device has multiple
> ports just from the pci vendor/device id without maintaining some
> sort of table.
> 
> Do these devices have multiple interfaces listed in their
> /sys/devices/.../net diretory?  If so, matching one of the listed
> interfaces can just blacklist the whole device similar to blacklisting
> by the device id.

Devices with multiple ports are supposed to report the port via /sys/class/net/xxx/portid

But you aren't going to be able to blacklist only one port of these devices.
The two drivers would be fighting over registers and IRQ management.
Plus kernel bind/unbind is by PCI id.