Commit be4a4b6a authored by Johannes Berg's avatar Johannes Berg Committed by John W. Linville
Browse files

mac80211: improve IBSS scanning 



When IBSS is fixed to a frequency, it can still
scan to try to find the right BSSID. This makes
sense if the BSSID isn't also fixed, but it need
not scan all channels -- just one is sufficient.
Make it do that by moving the scan setup code to
ieee80211_request_internal_scan() and include
a channel variable setting.

Note that this can be further improved to start
the IBSS right away if both frequency and BSSID
are fixed.

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent a75b4363

net/mac80211/ibss.c

+6 −3
Original line number Diff line number Diff line
@@ -488,7 +488,9 @@ static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 
	printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "

	       "IBSS networks with same SSID (merge)\n", sdata->name);



	ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len);

	ieee80211_request_internal_scan(sdata,

			ifibss->ssid, ifibss->ssid_len,

			ifibss->fixed_channel ? ifibss->channel : NULL);

}



static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
@@ -595,8 +597,9 @@ static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 
		printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "

		       "join\n", sdata->name);



		ieee80211_request_internal_scan(sdata, ifibss->ssid,

						ifibss->ssid_len);

		ieee80211_request_internal_scan(sdata,

				ifibss->ssid, ifibss->ssid_len,

				ifibss->fixed_channel ? ifibss->channel : NULL);

	} else {

		int interval = IEEE80211_SCAN_INTERVAL;

net/mac80211/ieee80211_i.h

+2 −1
Original line number Diff line number Diff line
@@ -1020,7 +1020,8 @@ void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata); 
/* scan/BSS handling */

void ieee80211_scan_work(struct work_struct *work);

int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata,

				    const u8 *ssid, u8 ssid_len);

				    const u8 *ssid, u8 ssid_len,

				    struct ieee80211_channel *chan);

int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,

			   struct cfg80211_scan_request *req);

void ieee80211_scan_cancel(struct ieee80211_local *local);

net/mac80211/main.c

+1 −16
Original line number Diff line number Diff line
@@ -439,7 +439,7 @@ int ieee80211_register_hw(struct ieee80211_hw *hw) 
	struct ieee80211_local *local = hw_to_local(hw);

	int result;

	enum ieee80211_band band;

	int channels, i, j, max_bitrates;

	int channels, max_bitrates;

	bool supp_ht;

	static const u32 cipher_suites[] = {

		WLAN_CIPHER_SUITE_WEP40,
@@ -605,21 +605,6 @@ int ieee80211_register_hw(struct ieee80211_hw *hw) 


	ieee80211_led_init(local);



	/* alloc internal scan request */

	i = 0;

	local->int_scan_req->ssids = &local->scan_ssid;

	local->int_scan_req->n_ssids = 1;

	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {

		if (!hw->wiphy->bands[band])

			continue;

		for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {

			local->int_scan_req->channels[i] =

				&hw->wiphy->bands[band]->channels[j];

			i++;

		}

	}

	local->int_scan_req->n_channels = i;



	local->network_latency_notifier.notifier_call =

		ieee80211_max_network_latency;

	result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,

net/mac80211/scan.c

+27 −1
Original line number Diff line number Diff line
@@ -728,10 +728,12 @@ int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 
}



int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata,

				    const u8 *ssid, u8 ssid_len)

				    const u8 *ssid, u8 ssid_len,

				    struct ieee80211_channel *chan)

{

	struct ieee80211_local *local = sdata->local;

	int ret = -EBUSY;

	enum nl80211_band band;



	mutex_lock(&local->scan_mtx);
@@ -739,6 +741,30 @@ int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata, 
	if (local->scan_req)

		goto unlock;



	/* fill internal scan request */

	if (!chan) {

		int i, nchan = 0;



		for (band = 0; band < IEEE80211_NUM_BANDS; band++) {

			if (!local->hw.wiphy->bands[band])

				continue;

			for (i = 0;

			     i < local->hw.wiphy->bands[band]->n_channels;

			     i++) {

				local->int_scan_req->channels[nchan] =

				    &local->hw.wiphy->bands[band]->channels[i];

				nchan++;

			}

		}



		local->int_scan_req->n_channels = nchan;

	} else {

		local->int_scan_req->channels[0] = chan;

		local->int_scan_req->n_channels = 1;

	}



	local->int_scan_req->ssids = &local->scan_ssid;

	local->int_scan_req->n_ssids = 1;

	memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);

	local->int_scan_req->ssids[0].ssid_len = ssid_len;

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