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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

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.