[iwn] request to test: linkq, plcp, txrate fixes

[Sean Bruno]

On Thu, 2013-10-24 at 13:04 -0700, Adrian Chadd wrote:
> Hi!
> 
> I have a patch against iwn(4):
> 
> http://people.freebsd.org/~adrian/ath/20131024-iwn-1-fix-xmit-rate-plcp-linkq.diff
> 
> This does a few things:
> 
> * The multi-rate retry ("link quality" stuff) on iwn is a table, and I
> think I broke it slightly when I implemented 11n rate control. This
> disables it for now, at least until I / someone implements a replacement
> table setup and linkq decision.
> 
> * get rid of the rate index stuff - it was used to decide a few things and
> it was doing legacy-only rate index lookups. I've just removed it; it's not
> needed.
> 
> * Teach the raw transmit path to use the new plcp lookup routine that sets
> things up.
> 
> * Correctly implement 11g protection. Right now it was a bit of a hack and
> it was not correct for 11a or 11n operation.
> 
> I still get transmit hangs on my 4965 but the "invalid rate" failures have
> disappeared. But for some odd reason, the transmits completed but weren't
> being marked as failed. I don't yet know why.
> 
> I'm also not sure why transmit is hanging; sometimes it looks like DMA
> stalls somehow.
> 
> So - maybe this'll help with various 11n issues on iwn(4), maybe it won't.
> I'm not sure yet. I'm trying to avoid taking ownership of iwn(4) but I
> rather dislike the occasional 5100/4965 hangs..
> 
> Thanks,
> 
> 
> 
> -adrian

running this now against 11-CURRENT.  No issues noted on my adapter
(Centrino Advanced-N 6205 [Taylor Peak]).  All seems very good.

I haven't tried it the office though, and that's the one that's the most
interesting I fear.

sean
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