Setting HT capabilities in net80211

[Alexander Egorenkov]

I have finally patched net80211 on my system and added HT extended
capabilities support.

Here are the patches.

I added a new variable to ieee80211com struct.
It seems that only the lowest 16 bit of ic_htcaps are used, an alternative
to a new variable would be to use the highest 16 bit of ic_htcaps.

Here is a code snippet from my driver which sets ic_htextcaps:

ic->ic_htextcaps = IEEE80211_HTCAP_MCSFBACK_UNSOL |
        IEEE80211_HTCAP_HTC |
        IEEE80211_HTCAP_RDR;

I also captured an association process with 802.11n AP and it seems the
capabilities were set right.

Alex.

On Thu, Mar 11, 2010 at 8:44 AM, Rui Paulo <rpaulo at freebsd.org> wrote:

>
> On 11 Mar 2010, at 16:32, Alexander Egorenkov wrote:
>
>  There are already constants defined in iee80211.h.
>> E.g. IEEE80211_HTCAP_MCSFBACK_UNSOL.
>>
>> But the problem is that e.g. IEEE80211_HTCAP_MCSFBACK_UNSOL is equal to
>> 0x0200
>> and the capabilty constant IEEE80211_HTCAP_RXSTBC_2STREAM has the same
>> value.
>> So we cannot use ic_htcap field for both capabilities because they will
>> overwrite each other.
>>
>> But  we can add a new field to ieee80211com struct like ic_htextcaps where
>> all the extended
>> HT capabilities can be set. And this new field can be checked in function
>> ieee80211_add_htcap_body.
>>
>
> I'm okay with this route.
>
>
>  Another option is to change the value of IEEE80211_HTCAP_MCSFBACK_UNSOL
>> and all other extended capability constant which conflict with normal HT
>> capability constants.
>>
>
> I think you don't want to do this because sooner or later you'll need
> ic_htextcaps.
>
> --
> Rui Paulo
>
>
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