From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH] Add support for configuring Infiniband GUIDs
Date: Fri, 6 May 2016 11:53:41 -0700
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To: Eli Cohen <eli@mellanox.com>
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On Fri,  6 May 2016 10:43:25 -0500
Eli Cohen <eli@mellanox.com> wrote:

> Add two NLA's that allow configuration of Infiniband node or port GUIDs
> by referencing the IPoIB net device set over then physical function. The
> format to be used is as follows:
> 
> ip link set dev ib0 vf 0 node_guid 00:02:c9:03:00:21:6e:70
> ip link set dev ib0 vf 0 port_guid 00:02:c9:03:00:21:6e:78
> 
> Issue: 702759
> Change-Id: I5ffb54d6de7bfa8650bf5818f484279914991d6e
> Signed-off-by: Eli Cohen <eli@mellanox.com>

I am not that familiar with Infiniband, but the documentation seems
to use a non-colon form:
 # ip link set dev ib0 vf 0 node_guid 0002c90300216e70

Seems like ip should follow the lead of ibstat and friends.