Prism2 Host AP - new release 2002-04-07

From: Jouni Malinen (jkmaline_at_cc.hut.fi)
Date: 2002-04-07 16:45:40 UTC

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A new version of Prism2 Host AP driver was just released and it is now available from http://people.ssh.com/jkm/Prism2/

This version has a very preminary (read: non-working ;-) version of user space daemon for management frame handling. It is disabled by default and is included just to give a preview of what might be coming in some future release. Don't even think that it would be documented yet ;-).

Another change, the optimized TX code path, is also disabled in default compilation since it has not been tested thorougly. However, I would like to here about the results if you happen to test it; especially interesting would be to know whether it helps AP platforms with low-performance CPUs.

2002-04-07

• fixed a bug in fake-WDS frame generation
  • if payload len was odd, the last byte was broken when adding fourth address to the end of the buffer
• use 8 (was 16) pre-allocated TX buffers to free RAM on Wireless LAN card
• added preliminary (not yet fully operational) version of use space daemon to handle management frames instead of kernel driver; this version of the kernel driver includes code for both methods and previously used driver-based handling of management frames is the default (PRISM2_HOSTAPD definition is used to enable user space daemon); management frames are sent using new netdevice wlan#ap between kernel and user spaces; user space daemon is in new hostapd subdirectory
• implemented optimized code path for transmit command use
  • use command completion interrupt instead of busy waiting for transmit command completion; i.e., replace even 150 usec busy wait per TX frame with one interrupt
  • prism2_transmit() is devided into two parts; the first one (prism2_transmit) executes transmit command and the second part (prism2_cmd_ev) consists of code that was previously run after the busy wait in prism2_transmit()
  • this code is not yet thoroughly tested, so the previous method using busy waiting is still the default one; new version can be enabled by uncommenting PRISM2_USE_CMD_COMPL_INTERRUPT definition in prism2.c
• stop/wake all used netdevices (i.e., also the WDS devices) when stopping a queue because there is no more room for new packets

-- 
Jouni Malinen                                            PGP id EFC895FA

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