netdev - DCB Auto turn off when link become up with Intel 82599ES ixgbe driver

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Date:	Tue, 5 Jul 2016 15:17:58 +0000 (UTC)
From:	ayuj <ayuj.verma@...il.com>
To:	netdev@...r.kernel.org
Subject: DCB Auto turn off when link become up with Intel 82599ES ixgbe driver

I'm trying to configure DCB in back-to-back scenario.
System details

OS :- CentOS 7.2
kernel 3.10.0-327.el7.x86_64
lldpad:- lldpad v0.9.46
dcbtool:- v0.9.46
ixgbe :- ixgbe-4.3.15

steps followed:- 

# modporbe ixgbe
# service lldpad start 
    Redirecting to /bin/systemctl start  lldpad.service


# service lldpad status
Redirecting to /bin/systemctl status  lldpad.service
● lldpad.service - Link Layer Discovery Protocol Agent Daemon.
   Loaded: loaded (/usr/lib/systemd/system/lldpad.service; disabled; vendor
preset: disabled)
   Active: active (running) since Tue 2016-07-05 05:49:12 EDT; 1s ago
 Main PID: 133737 (lldpad)
   CGroup: /system.slice/lldpad.service
           └─133737 /usr/sbin/lldpad -t

Jul 05 05:49:12 localhost.localdomain systemd[1]: Started Link Layer
Discovery Protocol Agent Daemon..
Jul 05 05:49:12 localhost.localdomain systemd[1]: Starting Link Layer
Discovery Protocol Agent Daemon....


# dcbtool gc p3p2 dcb 
Command:   	Get Config
Feature:   	DCB State
Port:      	p3p2
Status:    	Successful
DCB State:	off

# dcbtool sc p3p2 dcb on
Command:   	Set Config
Feature:   	DCB State
Port:      	p3p2
Status:    	Successful

# dcbtool gc p3p2 dcb 
Command:   	Get Config
Feature:   	DCB State
Port:      	p3p2
Status:    	Successful
DCB State:	on


Similar configuration on another system.

But as soon as I do "ifconfig p3p2 up and check dcb

# dcbtool gc p3p2 dcb 
Command:   	Get Config
Feature:   	DCB State
Port:      	p3p2
Status:    	Successful
DCB State:	off

Initially suspecting issue with lldpad daemon/ixgbe driver. I replaced them
(downloaded from repo) with latest packages.
Same behaviour observed.

- Tried disabling other dcb features like fcoe. Same issue.
- Disabled selinux etc


Can any 1 help me regarding this.