netdev - fail to add 64 VLANs or more when SR-IOV is enabled

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Message-ID: <9DE5760509B7974286F38D93BF31DD62C7CAA1@BPXM13GP.gisp.nec.co.jp>
Date:	Thu, 27 Mar 2014 09:10:32 +0000
From:	Madoka Komatsubara <m-komatsubara@...jp.nec.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>,
	Hiroshi Baba <h-baba@...jp.nec.com>
Subject: fail to add 64 VLANs or more when SR-IOV is enabled

Hi all,


We're facing an issue that we cannot add 64 VLANs or more per VF.
When using SR-IOV, pass through a VF to the KVM guest and a lot of VLANs,
we could add 63 VLANs using vconfig but we failed to add 64th VLAN.
We'd like to use many VLANs on the guest with SR-IOV.
We're using Intel's 82599EB chip with ixgbe and ixgbevf driver.

Has anyone seen the same issue?
Is there any idea to solve this?

The below instruction is a reproducing method.
Create hundred VLANs on the guest.

# for i in `seq 100 199`; do vconfig add eth2 $i; ifconfig 192.168.$i.1/24; done

# vconfig add eth2 100
Added VLAN with VID == 100 to IF -:eth2:-

# vconfig add eth2 101
Added VLAN with VID == 101 to IF -:eth2:-

# vconfig add eth2 102
Added VLAN with VID == 102 to IF -:eth2:-

...

# vconfig add eth2 162
Added VLAN with VID == 162 to IF -:eth2:-

# vconfig add eth2 163
ERROR: trying to add VLAN #163 to IF -:eth2:-  error: Permission denied
SIOCSIFADDR: No such device
eth2.163: unknown interface: No such device

# vconfig add eth2 164
ERROR: trying to add VLAN #164 to IF -:eth2:-  error: Permission denied
SIOCSIFADDR: No such device
eth2.164: unknown interface: No such device

# vconfig add eth2 165
ERROR: trying to add VLAN #165 to IF -:eth2:-  error: Permission denied
SIOCSIFADDR: No such device
eth2.165: unknown interface: No such device


thanks,
Madoka Komatsubara
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