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Date:	Thu, 18 Dec 2014 05:57:58 +0000
From:	Sathya Perla <Sathya.Perla@...lex.Com>
To:	Dan Williams <dcbw@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	Joshua Watt <jpewdev@...il.com>,
	"jpirko@...hat.com" <jpirko@...hat.com>,
	Florian Fainelli <f.fainelli@...il.com>
Subject: RE: [PATCH] Documentation: clarify phys_port_id

> -----Original Message-----
> From: netdev-owner@...r.kernel.org [mailto:netdev-
> 
> Signed-off-by: Dan Williams <dcbw@...hat.com>
> ---
>  Documentation/ABI/testing/sysfs-class-net | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-class-net
> b/Documentation/ABI/testing/sysfs-class-net
> index e1b2e78..7fe823a 100644
> --- a/Documentation/ABI/testing/sysfs-class-net
> +++ b/Documentation/ABI/testing/sysfs-class-net
> @@ -186,7 +186,12 @@ KernelVersion:	3.12
>  Contact:	netdev@...r.kernel.org
>  Description:
>  		Indicates the interface unique physical port identifier within
> -		the NIC, as a string.
> +		the NIC, as a string.  If two net_device objects share physical
> +		hardware or other resources, and/or do not operate
> independently
> +		both net_device objects should be assigned the
> +		same phys_port_id.  phys_port_id should be as globally
> unique
> +		as possible to prevent conflicts between different drivers
> and
> +		vendors, eg with MAC addresses or hardware GUIDs.

Dan, two interfaces -- on the same card/chip -- may share some chip resources,
but as long as they use *separate* physical ports, it would be OK to bond them.
So, in this case, it would be valid to report a different phys_port_id for these netdevs.

The text -- "share physical hardware or other resources" becomes too restrictive
                                                                          ^^^^^^^^^^^^^^^
and will not even allow bonding of two physical ports on a NIC card.

thks,
-Sathya
> 
>  What:		/sys/class/net/<iface>/speed
>  Date:		October 2009
> --
> 1.9.3
> 
> 
> --
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