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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