netdev - [0/2] Fix problems with with IFLA_VF

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Message-Id: <1398298956-13084-1-git-send-email-david@gibson.dropbear.id.au>
Date:	Thu, 24 Apr 2014 10:22:34 +1000
From:	David Gibson <david@...son.dropbear.id.au>
To:	netdev@...r.kernel.org
Cc:	ssujith@...co.com, neepatel@...co.com, benve@...co.com,
	davem@...emloft.net, ben@...adent.org.uk,
	govindarajulu90@...il.com, gregory.v.rose@...el.com
Subject: [0/2] Fix problems with with IFLA_VF_PORTS (v2)

I've had a customer encounter a problem with getifaddrs(3) freezing up
on a system with a Cisco enic device.

I've discovered that the problem is caused by an enic device with a
large number of SR-IOV virtual functions overflowing the normal sized
packet buffer for netlink, leading to interfaces not being reported
from an RTM_GETLINK request.

The first patch here just makes the problem easier to locate if it
occurs again in a different way, by adding a WARN_ON() when we run out
of room in a netlink packet in this manner.

The second patch actually fixes the problem, by only reporting
IFLA_VF_PORTS information when the RTEXT_FILTER_VF flag is specified.

v2: Corrected some CodingStyle problems
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