Ath5k on Insignificant Bits

Kernel updates

Sun, 18 Jul 2010 00:39:27 +0000

During baby naps I actually did some Rio Karma work this week. First, I found and fixed a recent bug in usb storage that makes the Karma not work at all in 2.6.35. Then I finally set up my omfs git tree on kernel.org, with a few patches I wrote almost two years ago, plus a recently found memory leak. I’ll try to get Linus to pull it in 2.6.36. Then, I made a new release of omfsprogs rewritten to use libomfs from the FUSE version of omfs (I also did this work two years ago). Now all is right in the Karma world again; time to ignore it for another 6 months.

Ath5k AP Mode

Sun, 01 Nov 2009 18:29:22 +0000

People seem to keep asking about this, despite there being a quality page on kernel.org on how to run an AP with any mac80211 driver. So for what it’s worth, here’s how my setup works. Note if you are seeing flakiness with certain clients, e.g. it works fine with a computer but not with your cell phone, it is likely there is some bug with the power saving handling. I’m currently working on a few such issues, so it may be fixed soon enough.

wl1251_sdio merged

Tue, 11 Aug 2009 03:27:23 +0000

The SDIO patches for TI 1251 (Android wifi chipset) are finally merged into wireless-testing, so they should be a lot easier to hack on now. That means the driver should make it into 2.6.32, though at a rather experimental stage. I did fix some crashes on ifup/ifdown since last posting, but there’s always more work to do. Current todo list includes better behavior for non-polling controllers (make the irq have a top-half), tracking down a device hang on reinitialization, pushing the msm_wifi.ko module, and on and on.

ath5k performance history

Fri, 03 Jul 2009 17:35:04 +0000

I was curious how well ath5k has been improving since its release, so I hacked up a little script to associate and do five minute iperf runs from /etc/rc.local. Looks pretty good so far (w-t is wireless-testing plus 5 or 6 extra patches I have brewing). The script is pretty kludgy, but may form the basis for some automatic build/regression testing in the future.

Kernel 2.6.30

Tue, 16 Jun 2009 15:54:57 +0000

Linux kernel 2.6.30 is out, featuring the best mainline support for ath5k yet. I recommend if you do use wireless with 2.6.30 (or .29), that you also grab this patch which fixes a nasty memory corruption issue. That one haunted me for months but it was a great feeling to finally nail it down. Of course the fix turned out to be quite simple. It should be hitting stable in short order.

2.6.30 preview

Wed, 01 Apr 2009 03:39:42 +0000

Now that Linux 2.6.29 just went out the door, here’s what I have prepared for 2.6.30 in the wireless arena. Of note, mac80211 now has suspend/resume support so a lot of nasty hacks in the drivers can go away. Most of the rest is just bug fixes, some of them for panics and soft lockups.

The work I’m excited about this week is scheduled for 2.6.31 – we extracted a bunch of ath9k regulatory infrastructure into a common module that all of the Atheros drivers (including the new ar9170) will use. This is the first step in getting a lot of that common code into a library. Hooray! Also Nick has some great improvements to the RF stuff queued up, so the driver is behaving much better.