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Date:	Fri, 14 Sep 2007 13:39:44 -0700
From:	Jay Vosburgh <>
To:	Dan Williams <>
cc:	Jeff Garzik <>,
	Andrew Morton <>,
	Linus Torvalds <>,, LKML <>
Subject: Re: [git patches] net driver fixes 

Dan Williams <> wrote:
>So essentially the ehea device has a 1(+) external ports that may/may
>not be connected, but all lpars share the physical hardware itself,
>which is quite happy to let all the lpars talk to each other essentially
>via loopback even if there is no actual carrier detected on the external
>port(s)? [...]


>[...]  How does addressing work here, is it just L2 addresses?  

	Yes.  The logical ports all have unique MAC addresses.

> [...] Feel
>free to point me to some docs and tell me to shut up :)

	I found this via google; I haven't read it in detail, but it
seems to cover the HEA architecture at a high level.  It talks about the
whole "IVE" (integrated virtual ethernet: the adapter, hypervisor, etc)
system, but HEA is part of that, so it's probably got the answers you're
looking for.


	-Jay Vosburgh, IBM Linux Technology Center,
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