|Subject:||Re: Where Linux 802.11x support needs work|
|From:||Roar Bjørgum Rotvik <roarbr@xxxxxxxxxx>|
|Date:||Wed, 26 Jan 2005 08:31:35 +0100|
|References:||<20050126024039.GA25326@bougret.hpl.hp.com> <Pine.LNX.email@example.com> <firstname.lastname@example.org>|
|User-agent:||Mozilla Thunderbird 1.0 (X11/20041206)|
Michael Wu wrote:
On Tuesday 25 January 2005 11:03 pm, Dan Williams wrote:
Do any of these 80.11 stacks (or the upstream linux network stack) have a solution for WLAN cards with 802.11e (QoS extension) with more than one HW/firmware transmit queues?
As you may or may not know WLAN cards implementing 802.11e may have more than one HW/firmware transmit queue (I know of an 802.11a chip with 802.11e extension that have 4 transmit queues in hardware/firmware with different priority).
As far as I know the linux network stack today only have one qdisc queue pr. device (struct netdev), so the driver may only stop/start (netif_stop_queue()/netif_wake_queue()) one queue at a time. This is a problem for drivers with more than one HW/firmware transmit queues, as you can not let a full low priority HW queue block the netdev queue.
Is there an existing solution for this problem, or is an multiqueue-pr-device solution being planned as part of introducing a common 802.11 stack in the kernel?
-- Roar B. Rotvik
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