Date: Wed, 27 Jan 2010 20:04:09 +0100 From: Alexander Egorenkov <egorenar@googlemail.com> To: freebsd-net@freebsd.org Subject: A-MPDU transmission in net80211 on FreeBSD 8 Message-ID: <2d3b7e441001271104j14836df4j14428d34561dead1@mail.gmail.com>
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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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