Alexander Egorenkov wrote:
Sorry, i posted the wrong comment.
Here is the comment which i don't understand:
/*
* NB: don't assign a sequence # to potential
* aggregates; we expect this happens at the
* point the frame comes off any aggregation q
* as otherwise we may introduce holes in the
* BA sequence space and/or make window accouting
* more difficult.
*
* XXX may want to control this with a driver
* capability; this may also change when we pull
* aggregation up into net80211
*/
Thanks.
What is unclear?
Sam
On Wed, Jan 27, 2010 at 8:04 PM, Alexander Egorenkov <
egore...@googlemail.com> wrote:
Hi,
i'm implementing a device driver for a 802.11n NIC under FreeBSD 8
und experimented with A-MPDU transmission. I looked into net80211 code
and there is some code which implements this feature but it worked not very
well for me.
I noticed e.g. that sequence numbers are not assigned to A-MPDU frames
and found this comment in file ieee80211_output.c :
/*
* Check if A-MPDU tx aggregation is setup or if we
* should try to enable it. The sta must be associated
* with HT and A-MPDU enabled for use. When the policy
* routine decides we should enable A-MPDU we issue an
* ADDBA request and wait for a reply. The frame being
* encapsulated will go out w/o using A-MPDU, or possibly
* it might be collected by the driver and held/retransmit.
* The default ic_ampdu_enable routine handles staggering
* ADDBA requests in case the receiver NAK's us or we are
* otherwise unable to establish a BA stream.
*/
Can somebody elaborate this description to me please.
Thanks.
ALex.
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