Re: [PATCH 5/5] mac80211: move TX info into skb->cb

[Ivo van Doorn <ivdoorn@gmail.com>]

On Thursday 15 May 2008, Johannes Berg wrote:
> On Thu, 2008-05-15 at 12:55 +0200, Johannes Berg wrote:
> > plain text document attachment (019-mac80211-tx-info-skb-cb.patch)
> > This patch converts mac80211 and all drivers to have transmit
> > information and status in skb->cb rather than allocating extra
> > memory for it and copying all the data around. To make it fit,
> > a union is used where only data that is necessary for all steps
> > is kept outside of the union.
> > 
> > A number of fixes were done by Ivo, as well as the rt2x00 part
> > of this patch.
> 
> I mangled it a bit though so you may want to check it, mac80211 now sets
> REQ_TX_STATUS so you can use that for status reporting, but you can't
> use it for queue kicking at least not in the future when mac80211 might
> not set it on all frames.

Well queue kicking from driver to mac80211 is in rt2x00 based on txdone
events on a particular queue. (When frame was succesfully transmitted
and is no longer full, then the queue will be awakened by rt2x00).
I am changing this a bit to support burst events that will send all
fragments in a single run, but that is currently under testing in rt2x00.git. 

Ivo