[dpdk-dev] [PATCH v2 2/7] lib/librte_ether: support l2 tunnel config
Bruce Richardson
bruce.richardson at intel.com
Tue Feb 2 13:03:29 CET 2016
On Tue, Feb 02, 2016 at 02:57:00PM +0800, Wenzhuo Lu wrote:
> Add functions to support l2 tunnel configuration.
> The support includes ether type modification and the tunnel support
> enabling/disabling.
> Ether type modification means modifying the ether type of a specific
> type of tunnel. So the packet with this ether type will be parsed as
> this type of tunnel.
> Enabling/disabling a tunnel support means enabling/disabling the
> ability of parsing the specific type of tunnel. This ability should
> be enabled before we enable filtering, forwarding, offloading for
> this specific type of tunnel.
> Only support e-tag tunnel now.
>
> E-tag introduction,
> E-tag means external tag which is defined in IEEEE 802.1BR
> specification.
> E-tag is a kind of l2 tunnel. It means a tag will be inserted in the
> l2 header. Like below,
> |31 24|23 16|15 8|7 0|
> 0| Destination MAC address |
> 4| Dest MAC address(cont.) | Src MAC address |
> 8| Source MAC address(cont.) |
> 12| E-tag Etherenet type (0x893f) | E-tag header |
> 16| E-tag header(cont.) |
> 20| VLAN Ethertype(optional) | VLAN header(optional) |
> 24| Original type | ...... |
> ...| ...... |
> The E-tag format is like below,
> |0 15|16 18|19 |20 31|
> | Ethertype - 0x893f | E-PCP |DEI| Ingress E-CID_base |
>
> |32 33|34 35|36 47|48 55 |56 63|
> | RSV | GRP |E-CID_base|Ingress_E-CID_ext| E-CID_ext |
>
> The Ingess_E-CID_ext and E-CID_ext are always zero for endpoints
> and are effectively reserved.
>
> The more details of E-tag is in IEEE 802.1BR. 802.1BR is used to
> replace 802.1Qbh. 802.1BR is a standard for Bridge Port Extension.
> It specifies the operation of Bridge Port Extenders, including
> management, protocols, and algorithms. Bridge Port Extenders
> operate in support of the MAC Service by Extended Bridges.
> The E-tag is added to l2 header to identify the VM channel and
> the virtual port.
>
> Signed-off-by: Wenzhuo Lu <wenzhuo.lu at intel.com>
Your introduction to e-tag needs to be in patch 1 rather than 2, and in the
cover letter, since both those earlier mails reference it.
Furthermore, it would be better if you could link to a web description of the
e-tag rather than try and explain it all in a commit message. Diagrams also work
better on a web-page.
/Bruce
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