On Tue, 6 Sep 2011 02:19:44 -0700
bill4carson bill4car...@gmail.com wrote:
Hi, guys
Just a quick question about vlan steering, does 82599 support this
feature?
I didn't see any description about it in the 82576/82599 specification
I think what you're looking for is the VMDQ mode of the hardware, where
either VLAN id or MAC address selects which queue.
Our drivers currently don't implement this support fully.
The bellow description is my understanding of vlan steering, correct
me if I'm wrong about this concept.
+-
Queue 1
++|
packets from wire| |+- Queue 2
- | sort method| ---|
| |+-
Queue x
++|
+-
The picture is kinda hosed, but what happens is that a packet is
received by the hardware, the queue is picked based on hardware
configuration, and the packet is delivered to a descriptor in that
queue.
Last queue
sort method matters most.
Vlan steering sort packets from wire based on the vlan ID in L2
packet into different queues,
this could relieve up layer protocol from the burden sorting by
software.
We currently already offload the vlan ID (and strip it from the packet)
so there isn't a whole lot of offload overhead, AFAIK.
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