netdev - RE: [net] igbvf: remove "link is Up" message when registering mcast address

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Date:	Fri, 5 Feb 2016 02:30:11 +0000
From:	"Brown, Aaron F" <aaron.f.brown@...el.com>
To:	Jon Maxwell <jmaxwell37@...il.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
CC:	"davem@...emloft.net" <davem@...emloft.net>,
	"jmaxwell@...hat.com" <jmaxwell@...hat.com>,
	"vinschen@...hat.com" <vinschen@...hat.com>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [net] igbvf: remove "link is Up" message when registering mcast
 address

> From: netdev-owner@...r.kernel.org [netdev-owner@...r.kernel.org] on behalf of Jon Maxwell [jmaxwell37@...il.com]
> Sent: Sunday, January 24, 2016 3:22 PM
> To: Kirsher, Jeffrey T
> Cc: davem@...emloft.net; jmaxwell@...hat.com; vinschen@...hat.com; intel-wired-lan@...ts.osuosl.org; netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Jon Maxwell
> Subject: [net] igbvf: remove "link is Up" message when registering mcast address
> 
> A similar issue was addressed a few years ago in the following thread:
> 
> http://www.spinics.net/lists/netdev/msg245877.html
> 
> At that time there were concerns that removing this statement may cause other
> side effects. However the submitter addressed those concerns. But the dialogue
> went cold. We have a new case where a customers application is registering and
> un-registering multicast addresses every few seconds. This is leading to many
> "Link is Up" messages in the logs as a result of the
> "netif_carrier_off(netdev)" statement called by igbvf_msix_other(). Also on
> some kernels it is interfering with the bonding driver causing it to failover
> and subsequently affecting connectivity.
> 
> The Sourgeforge driver does not make this call and is therefore not affected.
> If there were any side effects I would expect that driver to also be affected.
> I have tested re-loading the igbvf driver and downing the adapter with the PF
> entity on the host where the VM has this patch. When I bring it back up again
> connectivity is restored as expected. Therefore I request that this patch gets
> submitted.
> 
> Signed-off-by: Jon Maxwell <jmaxwell37@...il.com>
> ---
>  drivers/net/ethernet/intel/igbvf/netdev.c | 1 -
>  1 file changed, 1 deletion(-)
> 

Tested-by: Aaron Brown <aaron.f.brown@...el.com>