Hostapd and MCS rates

Mathieu Slabbinck matty.slabbinck at gmail.com
Thu Jun 18 03:25:44 EDT 2015


Hi,

it's an atheros chipset. Unex DHXA-222.

Kr

On Thu, Jun 18, 2015 at 9:21 AM, Huang, ChengcaiX
<chengcaix.huang at intel.com> wrote:
> Hi,
>
> If you use brcm chip, you can set the 11n mode rate MCS index with brcm "wl" config tool.
>
>  root:/ # wlx nrate
> mcs index 14 stf mode 3 auto
> root:/ # wlx nrate -m 5
> root:/ # wlx nrate
> mcs index 5 stf mode 1 fixed
>
> Below is info. About the command:
> wl nrate: you need to set a legacy or mcs rate
> nrate   "auto" to clear a rate override, or:
> -r legacy rate (CCK, OFDM)
> -m HT MCS index
> -s stf mode (0=SISO,1=CDD,2=STBC,3=SDM)
> -w Override MCS only to support STA's with/without STBC capability
>
> Best,wishes
> Cai
> -----Original Message-----
> From: hostap-bounces at lists.shmoo.com [mailto:hostap-bounces at lists.shmoo.com] On Behalf Of Mathieu Slabbinck
> Sent: Thursday, June 18, 2015 3:02 PM
> To: Eduardo Abinader
> Cc: hostap at lists.shmoo.com
> Subject: Re: Hostapd and MCS rates
>
> Recompiled wpa_supplicant with CONFIG_HT_OVERRIDES but nothing changes.
>
> using iw dev wlan0 set bitrates ht-mcs-5 2 sgi-5 or iw dev wlan0 set bitrates legacy-5 54 does not change the datarate of the packets.
>
> Can I force it somehow to test if mcs rates are in fact able to be set?
>
> Kr
>
> On Wed, Jun 17, 2015 at 2:09 PM, Eduardo Abinader <eduardo.abinader at openbossa.org> wrote:
>> I checked more in detail and noticed what Jouni has said previously:
>> it is meant at the moment for wpa_supplicant only and for that you
>> need also CONFIG_HT_OVERRIDES=y in order wpa_set_htcap_mcs to be
>> called.
>>
>>
>> Cheers.
>>
>> On Wed, Jun 17, 2015 at 2:48 AM, Mathieu Slabbinck
>> <matty.slabbinck at gmail.com> wrote:
>>> Hi,
>>>
>>> Thanks for the info.
>>> I'm using buildroot and checked the package. It states the following
>>> config options:
>>> HOSTAPD_CONFIG_ENABLE = \
>>>     CONFIG_ACS \
>>>     CONFIG_FULL_DYNAMIC_VLAN \
>>>     CONFIG_HS20 \
>>>     CONFIG_IEEE80211AC \
>>>     CONFIG_IEEE80211N \
>>>     CONFIG_IEEE80211R \
>>>     CONFIG_INTERNAL_LIBTOMMATH \
>>>     CONFIG_INTERWORKING \
>>>     CONFIG_LIBNL32 \
>>>     CONFIG_VLAN_NETLINK
>>>
>>> So that's checked.
>>>
>>> Also, in my config file of hostapd states ieee80211n=1 So that should
>>> be fine to.
>>>
>>> iw dev wlan0 station dump does not report anything...
>>>
>>> On Tue, Jun 16, 2015 at 5:04 PM, Eduardo Abinader
>>> <eduardo.abinader at openbossa.org> wrote:
>>>> Hi,
>>>>
>>>> I think you should enable at least CONFIG_IEEE80211N=y and
>>>> ieee80211n=1, so the HT rates are set as well as MCS rate info. Then
>>>> station dump with iw to check the MCS.
>>>>
>>>>
>>>> Cheers.
>>>>
>>>>
>>>> On Tue, Jun 16, 2015 at 5:41 AM, Mathieu Slabbinck
>>>> <matty.slabbinck at gmail.com> wrote:
>>>>> That's something I already tried but if I capture any packets they
>>>>> are not in any mcs rate.
>>>>> Therefore I was wondering if hostapd provides any configuration to do this.
>>>>>
>>>>> On Tue, Jun 16, 2015 at 11:31 AM, Avinash Patil <avinashapatil at gmail.com> wrote:
>>>>>> On Tue, Jun 16, 2015 at 2:53 PM, Mathieu Slabbinck
>>>>>> <matty.slabbinck at gmail.com> wrote:
>>>>>>> Hi,
>>>>>>>
>>>>>>> I'm trying to force my AP into an mcs indexed bitrate but there's
>>>>>>> not to much information I can find around this.
>>>>>>>
>>>>>>> Can anyone provide some information on how to force hostapd to
>>>>>>> set up an AP with an MCS rate?
>>>>>>
>>>>>> I think hostapd configures basic and extended rates only. If you
>>>>>> want to force using MCS rates your best bet is iw utility.
>>>>>>
>>>>>> "iw --help" yields this:
>>>>>>
>>>>>>     dev <devname> set bitrates [legacy-<2.4|5> <legacy rate in
>>>>>> Mbps>*] [ht-mcs-<2.4|5> <MCS index>*] [vht-mcs-<2.4|5>
>>>>>> <NSS:MCSx,MCSy... | NSS:MCSx-MCSy>*] [sgi-2.4|lgi-2.4] [sgi-5|lgi-5]
>>>>>>         Sets up the specified rate masks.
>>>>>>         Not passing any arguments would clear the existing mask (if any).
>>>>>>
>>>>>>> Kind regards
>>>>>>>
>>>>>>> Mathieu
>>>>>>> _______________________________________________
>>>>>>> HostAP mailing list
>>>>>>> HostAP at lists.shmoo.com
>>>>>>> http://lists.shmoo.com/mailman/listinfo/hostap
>>>>>>
>>>>>> -Avinash
>>>>> _______________________________________________
>>>>> HostAP mailing list
>>>>> HostAP at lists.shmoo.com
>>>>> http://lists.shmoo.com/mailman/listinfo/hostap
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