netdev - RE: [net-next 07/15] i40e: Separate out DCB capability and enabled flags

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Message-ID: <739353123C992A4C8800D77E209425907ECD55FC@ORSMSX103.amr.corp.intel.com>
Date:	Thu, 12 Jun 2014 16:59:20 +0000
From:	"Parikh, Neerav" <neerav.parikh@...el.com>
To:	Or Gerlitz <or.gerlitz@...il.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
CC:	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"gospo@...hat.com" <gospo@...hat.com>,
	"sassmann@...hat.com" <sassmann@...hat.com>
Subject: RE: [net-next 07/15] i40e: Separate out DCB capability and enabled
 flags



> -----Original Message-----
> From: Or Gerlitz [mailto:or.gerlitz@...il.com]
> Sent: Thursday, June 12, 2014 1:22 AM
> To: Kirsher, Jeffrey T
> Cc: David Miller; Parikh, Neerav; netdev@...r.kernel.org; gospo@...hat.com;
> sassmann@...hat.com
> Subject: Re: [net-next 07/15] i40e: Separate out DCB capability and enabled
> flags
> 
> On Wed, Jun 11, 2014 at 7:33 PM, Jeff Kirsher
> <jeffrey.t.kirsher@...el.com> wrote:
> > From: Neerav Parikh <neerav.parikh@...el.com>
> >
> > Currently if the firmware reports DCB capability the driver enables
> > I40E_FLAG_DCB_ENABLED flag. When this flag is enabled the driver
> > inserts a tag when transmitting a packet from the port
> 
> what is this tag (vlan?) and how it's determined?
>
Yes it's a vlan tag. In a DCB environment traffic will be typically priority tagged
apart from the control protocols (e.g. LLDP) wich are sent untagged. 
Administrators will configure the vlans based on their network configuration 
and applications that needs a particular QoS sets the skb priority.
FCoE is an example of such an application. 

What should be the priority for a particular application is typically determined 
via DCBX.
 
> > even if there are no DCB traffic classes configured at the port.