netdev - Re: [PATCH net-next] liquidio: Added ndo_get_phys_port

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Message-Id: <20180305.102339.1643465658148939503.davem@davemloft.net>
Date:   Mon, 05 Mar 2018 10:23:39 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     felix.manlunas@...ium.com
Cc:     netdev@...r.kernel.org, raghu.vatsavayi@...ium.com,
        derek.chickles@...ium.com, satananda.burla@...ium.com,
        intiyaz.basha@...ium.com
Subject: Re: [PATCH net-next] liquidio: Added ndo_get_phys_port_id support

From: Felix Manlunas <felix.manlunas@...ium.com>
Date: Fri, 2 Mar 2018 18:59:10 -0800

> Added support to the ndo_get_phys_port_id() callback to provide
> port specific unique id to the netdev layer.
> 
> Port id needs to be unique across different liquidio devices in the system.
> So used MAC address for port_id.

This doesn't look right at all.

The physical port ID is used in order to distinguish several netdev
devices present on the same PHYSICAL PORT.

So you should be using a number that is unique within a physical
port.

Using the MAC address for this doesn't make any sense at all.