[ath9k-devel] How to set a scan with ath9k driver

[ath9k-devel] How to set a scan with ath9k driver

[Francisco Cuesta]

Hello,

I would like to know whether someone might point out where a  sta-mode
scan in ath9k driver is carried out. I mean, if I want to perform such
a scan, I have seen that hostapd or wpa supplicant requests the driver
through nl80211 interface such a petition. But I cannot understand how
this petition is made, in terms of assigning the parameters of the
scan. How or where is the frequency or channel imposed for such a
scan?

I really appreciate any hint,

Regards,

[ath9k-devel] How to set a scan with ath9k driver

[Mohammed Shafi Shajakhan]

On Wed, May 22, 2013 at 02:12:13PM +0200, Francisco Cuesta wrote:
> Hello,
> 
> I would like to know whether someone might point out where a  sta-mode
> scan in ath9k driver is carried out. I mean, if I want to perform such
> a scan, I have seen that hostapd or wpa supplicant requests the driver
> through nl80211 interface such a petition. But I cannot understand how
> this petition is made, in terms of assigning the parameters of the
> scan. How or where is the frequency or channel imposed for such a
> scan?

nl80211 nl80211_trigger_scan->rdev_scan which
calls mac80211's callback iee80211_scan 

iee80211_scan -> ieee80211_request_scan -> ieee80211_start_scan
->ieee80211_start_sw_scan -> queues ieee80211_scan_work

ieee80211_scan_work has the states 
SCAN_DECISION/SET_CHANNEL/PROBE etc

SCAN_SET_CHANNEL calls drivers ath9k_config with CONF_CHANGE_CHANNEL
flag set, please follow from there for the driver code.


> 
> I really appreciate any hint,
> 
> Regards,
> _______________________________________________
> HostAP mailing list
> HostAP at lists.shmoo.com
> http://lists.shmoo.com/mailman/listinfo/hostap

[ath9k-devel] How to set a scan with ath9k driver

[Francisco Cuesta]

HEllo Mohammend, thanks for replying your sequence was really helpful

2013/5/22 Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>:
> On Wed, May 22, 2013 at 02:12:13PM +0200, Francisco Cuesta wrote:
>> Hello,
>>
>> I would like to know whether someone might point out where a  sta-mode
>> scan in ath9k driver is carried out. I mean, if I want to perform such
>> a scan, I have seen that hostapd or wpa supplicant requests the driver
>> through nl80211 interface such a petition. But I cannot understand how
>> this petition is made, in terms of assigning the parameters of the
>> scan. How or where is the frequency or channel imposed for such a
>> scan?
>
> nl80211 nl80211_trigger_scan->rdev_scan which
> calls mac80211's callback iee80211_scan
>
> iee80211_scan -> ieee80211_request_scan -> ieee80211_start_scan
> ->ieee80211_start_sw_scan -> queues ieee80211_scan_work
>
I'm getting stuck since I'm looking for the function queues
ieee80211_scan_work, but I cannot identify it on my mac80211 code,
which is as follows

static int ieee80211_start_sw_scan(struct ieee80211_local *local)
{
    /*
     * Hardware/driver doesn't support hw_scan, so use software...
     */
    drv_sw_scan_start(local);

    local->leave_oper_channel_time = jiffies;
    local->next_scan_state = SCAN_DECISION;
    local->scan_channel_idx = 0;

    ieee80211_offchannel_stop_vifs(local, true);

    ieee80211_configure_filter(local);

    /* We need to set power level at maximum rate for scanning. */
    ieee80211_hw_config(local, 0);

    ieee80211_queue_delayed_work(&local->hw,
                     &local->scan_work, 0);

    return 0;
}

Is the function called ieee80211_queue_delayed_work??

> ieee80211_scan_work has the states
> SCAN_DECISION/SET_CHANNEL/PROBE etc
>
> SCAN_SET_CHANNEL calls drivers ath9k_config with CONF_CHANGE_CHANNEL
> flag set, please follow from there for the driver code.
>
>
>>
>> I really appreciate any hint,
>>
>> Regards,
>> _______________________________________________
>> HostAP mailing list
>> HostAP at lists.shmoo.com
>> http://lists.shmoo.com/mailman/listinfo/hostap

[ath9k-devel] How to set a scan with ath9k driver

[Matt Chen]

INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);

So it would do void ieee80211_scan_work(struct work_struct *work) {.....


2013/5/24 Francisco Cuesta <ndarkness@gmail.com>

> HEllo Mohammend, thanks for replying your sequence was really helpful
>
> 2013/5/22 Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>:
> > On Wed, May 22, 2013 at 02:12:13PM +0200, Francisco Cuesta wrote:
> >> Hello,
> >>
> >> I would like to know whether someone might point out where a  sta-mode
> >> scan in ath9k driver is carried out. I mean, if I want to perform such
> >> a scan, I have seen that hostapd or wpa supplicant requests the driver
> >> through nl80211 interface such a petition. But I cannot understand how
> >> this petition is made, in terms of assigning the parameters of the
> >> scan. How or where is the frequency or channel imposed for such a
> >> scan?
> >
> > nl80211 nl80211_trigger_scan->rdev_scan which
> > calls mac80211's callback iee80211_scan
> >
> > iee80211_scan -> ieee80211_request_scan -> ieee80211_start_scan
> > ->ieee80211_start_sw_scan -> queues ieee80211_scan_work
> >
> I'm getting stuck since I'm looking for the function queues
> ieee80211_scan_work, but I cannot identify it on my mac80211 code,
> which is as follows
>
> static int ieee80211_start_sw_scan(struct ieee80211_local *local)
> {
>     /*
>      * Hardware/driver doesn't support hw_scan, so use software...
>      */
>     drv_sw_scan_start(local);
>
>     local->leave_oper_channel_time = jiffies;
>     local->next_scan_state = SCAN_DECISION;
>     local->scan_channel_idx = 0;
>
>     ieee80211_offchannel_stop_vifs(local, true);
>
>     ieee80211_configure_filter(local);
>
>     /* We need to set power level at maximum rate for scanning. */
>     ieee80211_hw_config(local, 0);
>
>     ieee80211_queue_delayed_work(&local->hw,
>                      &local->scan_work, 0);
>
>     return 0;
> }
>
> Is the function called ieee80211_queue_delayed_work??
>
> > ieee80211_scan_work has the states
> > SCAN_DECISION/SET_CHANNEL/PROBE etc
> >
> > SCAN_SET_CHANNEL calls drivers ath9k_config with CONF_CHANGE_CHANNEL
> > flag set, please follow from there for the driver code.
> >
> >
> >>
> >> I really appreciate any hint,
> >>
> >> Regards,
> >> _______________________________________________
> >> HostAP mailing list
> >> HostAP at lists.shmoo.com
> >> http://lists.shmoo.com/mailman/listinfo/hostap
> _______________________________________________
> HostAP mailing list
> HostAP at lists.shmoo.com
> http://lists.shmoo.com/mailman/listinfo/hostap
>
>
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