Chenchong's work on net80211_ratectl

[Chenchong Qin]

Hi!

I've added the common ratectl state as an mbuf tag!

After days of frustration (compile errors, boot failed, kernel panics,
suddenly kernel freezing...), it seems that ath now can use 11n-aware
net80211 ratectl api to do rate control. Attachment[0] is the diff of
modifications to dev/ath. Changes to net80211 is minor this time. Just add
some debug msgs to it. Please reference my gsoc svn
repo<https://svnweb.freebsd.org/socsvn/soc2013/ccqin/head/>
.

It's worth mentioning that sometimes the kernel will "freezing" (it looks
like all things stop working, screen is freezing, keyboard and mouse are
not responding) after wireless stuff start working for a while. At first, I
consider it caused by my modification to ath. But this strange thing can
also happen in a head kernel (r255382). Attachment[1] is some useful
messages just before it happens. By the way, I use a AR9227 device.

And, I found that, for aggregation scenario, ath gathers tx information and
update the ratectl states. So, what we can do to net80211 to let it support
aggregation?

Thanks!

Chenchong


On Tue, Sep 3, 2013 at 9:29 AM, Chenchong Qin <qinchenchong at gmail.com>wrote:

> OK!
>
> Thanks! :-)
>
> Chenchong
>
>
> On Tue, Sep 3, 2013 at 1:56 AM, Adrian Chadd <adrian at freebsd.org> wrote:
>
>> Hi!
>>
>> You can declare an mbuf tag and use that. Look at M_TXCB in net80211 and
>> how mbuf tags are added.
>>
>> I've long thought about adding a net80211 mbuf tag to represent -all- of
>> the tx related state - TX callback, rate control, rate completion,
>> aggregation state, retry count, etc. That way all the drivers can use it.
>>
>>
>>
>> -adrian
>>
>>
>
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