netdev - Re: RFC: rtnetlink problems with Cisco enic and VFs

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Message-Id: <20140422.141200.1878796491205301689.davem@davemloft.net>
Date:	Tue, 22 Apr 2014 14:12:00 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ben@...adent.org.uk
Cc:	dgibson@...hat.com, netdev@...r.kernel.org, benve@...co.com,
	ssujith@...co.com, govindarajulu90@...il.com, neepatel@...co.com,
	nistrive@...co.com
Subject: Re: RFC: rtnetlink problems with Cisco enic and VFs

From: Ben Hutchings <ben@...adent.org.uk>
Date: Tue, 22 Apr 2014 19:03:19 +0100

> 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.

I think that's what we'll have to do.
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