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Message-ID: <1398189799.7767.80.camel@deadeye.wl.decadent.org.uk>
Date:	Tue, 22 Apr 2014 19:03:19 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	David Gibson <dgibson@...hat.com>
Cc:	netdev@...r.kernel.org, Christian Benvenuti <benve@...co.com>,
	Sujith Sankar <ssujith@...co.com>,
	Govindarajulu Varadarajan <govindarajulu90@...il.com>,
	Neel Patel <neepatel@...co.com>,
	Nishank Trivedi <nistrive@...co.com>
Subject: Re: RFC: rtnetlink problems with Cisco enic and VFs

On Tue, 2014-04-22 at 14:14 +1000, David Gibson wrote:
> I believe I've found a problem with netlink handling which can be
> triggered on Cisco enic devices with a large number (30-40) of virtual
> functions.  I believe this is the cause of a real customer problem
> we've seen.
> 
>  * When requesting a list of interfaces with RTM_GETLINK, enic devices
>    (and currently, _only_ enic devices) report IFLA_VF_PORTS
>    information 
> 
>  * IFLA_VF_PORTS information has at least 90 bytes ber virtual function
> 
>  * Unlike IFLA_VFINFO_LIST, the ports information is always reported,
>    regardless of the setting of the IFLA_EXT_MASK parameter
[...]

So I think you should make reporting of IFLA_VF_PORTS dependent on the
same flag as IFLA_VFINFO_LIST.

Ben.

-- 
Ben Hutchings
Beware of programmers who carry screwdrivers. - Leonard Brandwein

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