[PATCH V2 08/10] brcmfmac: add support multi-scheduled scan

[Arend van Spriel <arend.vanspriel@broadcom.com>]

This change adds support for multi-scheduled scan in the driver. It
currently relies on g-scan support in firmware and will set struct
wiphy::max_sched_scan_reqs accordingly. This is limited to 16 concurrent
requests.

The firmware currently has a limit of 64 channels that can be configured
for all requests in total regardless whether there are duplicates. So if
a request uses 35 channels there are 29 channels left for another request.
When user-space does not specify any channels cfg80211 will add all channels
defined by the wiphy instance to the request, which makes reaching the limit
rather easy for dual-band devices.

Reviewed-by: Hante Meuleman <hante.meuleman@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>
Reviewed-by: Franky Lin <franky.lin@broadcom.com>
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
---
 V2:
  - change return value to -ENODATA in brcmf_pno_prep_fwconfig() if called
    without active requests.
---
 .../broadcom/brcm80211/brcmfmac/cfg80211.c         |  67 +++-
 .../broadcom/brcm80211/brcmfmac/cfg80211.h         |   6 +-
 .../wireless/broadcom/brcm80211/brcmfmac/core.c    |   1 +
 .../wireless/broadcom/brcm80211/brcmfmac/debug.h   |   2 +
 .../broadcom/brcm80211/brcmfmac/fwil_types.h       |  31 +-
 .../net/wireless/broadcom/brcm80211/brcmfmac/pno.c | 400 ++++++++++++++++++---
 .../net/wireless/broadcom/brcm80211/brcmfmac/pno.h |  47 ++-
 7 files changed, 463 insertions(+), 91 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index 9244b0b..c5119be 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -719,6 +719,8 @@ s32 brcmf_notify_escan_complete(struct brcmf_cfg80211_info *cfg,
 {
 	struct brcmf_scan_params_le params_le;
 	struct cfg80211_scan_request *scan_request;
+	u64 reqid;
+	u32 bucket;
 	s32 err = 0;
 
 	brcmf_dbg(SCAN, "Enter\n");
@@ -749,7 +751,7 @@ s32 brcmf_notify_escan_complete(struct brcmf_cfg80211_info *cfg,
 		err = brcmf_fil_cmd_data_set(ifp, BRCMF_C_SCAN,
 					     &params_le, sizeof(params_le));
 		if (err)
-			brcmf_err("Scan abort  failed\n");
+			brcmf_err("Scan abort failed\n");
 	}
 
 	brcmf_scan_config_mpc(ifp, 1);
@@ -758,11 +760,21 @@ s32 brcmf_notify_escan_complete(struct brcmf_cfg80211_info *cfg,
 	 * e-scan can be initiated internally
 	 * which takes precedence.
 	 */
-	if (cfg->internal_escan) {
-		brcmf_dbg(SCAN, "scheduled scan completed\n");
-		cfg->internal_escan = false;
-		if (!aborted)
-			cfg80211_sched_scan_results(cfg_to_wiphy(cfg), 0);
+	if (cfg->int_escan_map) {
+		brcmf_dbg(SCAN, "scheduled scan completed (%x)\n",
+			  cfg->int_escan_map);
+		while (cfg->int_escan_map) {
+			bucket = __ffs(cfg->int_escan_map);
+			cfg->int_escan_map &= ~BIT(bucket);
+			reqid = brcmf_pno_find_reqid_by_bucket(cfg->pno,
+							       bucket);
+			if (!aborted) {
+				brcmf_dbg(SCAN, "report results: reqid=%llu\n",
+					  reqid);
+				cfg80211_sched_scan_results(cfg_to_wiphy(cfg),
+							    reqid);
+			}
+		}
 	} else if (scan_request) {
 		struct cfg80211_scan_info info = {
 			.aborted = aborted,
@@ -1011,7 +1023,7 @@ static void brcmf_escan_prep(struct brcmf_cfg80211_info *cfg,
 			if (!ssid_le.SSID_len)
 				brcmf_dbg(SCAN, "%d: Broadcast scan\n", i);
 			else
-				brcmf_dbg(SCAN, "%d: scan for  %s size =%d\n",
+				brcmf_dbg(SCAN, "%d: scan for  %.32s size=%d\n",
 					  i, ssid_le.SSID, ssid_le.SSID_len);
 			memcpy(ptr, &ssid_le, sizeof(ssid_le));
 			ptr += sizeof(ssid_le);
@@ -3011,7 +3023,7 @@ void brcmf_abort_scanning(struct brcmf_cfg80211_info *cfg)
 	struct escan_info *escan = &cfg->escan_info;
 
 	set_bit(BRCMF_SCAN_STATUS_ABORT, &cfg->scan_status);
-	if (cfg->internal_escan || cfg->scan_request) {
+	if (cfg->int_escan_map || cfg->scan_request) {
 		escan->escan_state = WL_ESCAN_STATE_IDLE;
 		brcmf_notify_escan_complete(cfg, escan->ifp, true, true);
 	}
@@ -3034,7 +3046,7 @@ static void brcmf_escan_timeout(unsigned long data)
 	struct brcmf_cfg80211_info *cfg =
 			(struct brcmf_cfg80211_info *)data;
 
-	if (cfg->internal_escan || cfg->scan_request) {
+	if (cfg->int_escan_map || cfg->scan_request) {
 		brcmf_err("timer expired\n");
 		schedule_work(&cfg->escan_timeout_work);
 	}
@@ -3117,7 +3129,7 @@ static void brcmf_escan_timeout(unsigned long data)
 		if (brcmf_p2p_scan_finding_common_channel(cfg, bss_info_le))
 			goto exit;
 
-		if (!cfg->internal_escan && !cfg->scan_request) {
+		if (!cfg->int_escan_map && !cfg->scan_request) {
 			brcmf_dbg(SCAN, "result without cfg80211 request\n");
 			goto exit;
 		}
@@ -3163,7 +3175,7 @@ static void brcmf_escan_timeout(unsigned long data)
 		cfg->escan_info.escan_state = WL_ESCAN_STATE_IDLE;
 		if (brcmf_p2p_scan_finding_common_channel(cfg, NULL))
 			goto exit;
-		if (cfg->internal_escan || cfg->scan_request) {
+		if (cfg->int_escan_map || cfg->scan_request) {
 			brcmf_inform_bss(cfg);
 			aborted = status != BRCMF_E_STATUS_SUCCESS;
 			brcmf_notify_escan_complete(cfg, ifp, aborted, false);
@@ -3233,17 +3245,21 @@ static int brcmf_internal_escan_add_info(struct cfg80211_scan_request *req,
 	return 0;
 }
 
-static int brcmf_start_internal_escan(struct brcmf_if *ifp,
+static int brcmf_start_internal_escan(struct brcmf_if *ifp, u32 fwmap,
 				      struct cfg80211_scan_request *request)
 {
 	struct brcmf_cfg80211_info *cfg = ifp->drvr->config;
 	int err;
 
 	if (test_bit(BRCMF_SCAN_STATUS_BUSY, &cfg->scan_status)) {
+		if (cfg->int_escan_map)
+			brcmf_dbg(SCAN, "aborting internal scan: map=%u\n",
+				  cfg->int_escan_map);
 		/* Abort any on-going scan */
 		brcmf_abort_scanning(cfg);
 	}
 
+	brcmf_dbg(SCAN, "start internal scan: map=%u\n", fwmap);
 	set_bit(BRCMF_SCAN_STATUS_BUSY, &cfg->scan_status);
 	cfg->escan_info.run = brcmf_run_escan;
 	err = brcmf_do_escan(ifp, request);
@@ -3251,7 +3267,7 @@ static int brcmf_start_internal_escan(struct brcmf_if *ifp,
 		clear_bit(BRCMF_SCAN_STATUS_BUSY, &cfg->scan_status);
 		return err;
 	}
-	cfg->internal_escan = true;
+	cfg->int_escan_map = fwmap;
 	return 0;
 }
 
@@ -3293,6 +3309,7 @@ static int brcmf_start_internal_escan(struct brcmf_if *ifp,
 	struct wiphy *wiphy = cfg_to_wiphy(cfg);
 	int i, err = 0;
 	struct brcmf_pno_scanresults_le *pfn_result;
+	u32 bucket_map;
 	u32 result_count;
 	u32 status;
 
@@ -3330,6 +3347,7 @@ static int brcmf_start_internal_escan(struct brcmf_if *ifp,
 
 	netinfo_start = brcmf_get_netinfo_array(pfn_result);
 
+	bucket_map = 0;
 	for (i = 0; i < result_count; i++) {
 		netinfo = &netinfo_start[i];
 		if (!netinfo) {
@@ -3341,6 +3359,7 @@ static int brcmf_start_internal_escan(struct brcmf_if *ifp,
 
 		brcmf_dbg(SCAN, "SSID:%.32s Channel:%d\n",
 			  netinfo->SSID, netinfo->channel);
+		bucket_map |= brcmf_pno_get_bucket_map(cfg->pno, netinfo);
 		err = brcmf_internal_escan_add_info(request,
 						    netinfo->SSID,
 						    netinfo->SSID_len,
@@ -3349,7 +3368,10 @@ static int brcmf_start_internal_escan(struct brcmf_if *ifp,
 			goto out_err;
 	}
 
-	err = brcmf_start_internal_escan(ifp, request);
+	if (!bucket_map)
+		goto free_req;
+
+	err = brcmf_start_internal_escan(ifp, bucket_map, request);
 	if (!err)
 		goto free_req;
 
@@ -3368,11 +3390,11 @@ static int brcmf_start_internal_escan(struct brcmf_if *ifp,
 	struct brcmf_if *ifp = netdev_priv(ndev);
 	struct brcmf_cfg80211_info *cfg = wiphy_priv(wiphy);
 
-	brcmf_dbg(SCAN, "Enter n_match_sets:%d n_ssids:%d\n",
+	brcmf_dbg(SCAN, "Enter: n_match_sets=%d n_ssids=%d\n",
 		  req->n_match_sets, req->n_ssids);
 
 	if (test_bit(BRCMF_SCAN_STATUS_SUPPRESS, &cfg->scan_status)) {
-		brcmf_err("Scanning suppressed: status (%lu)\n",
+		brcmf_err("Scanning suppressed: status=%lu\n",
 			  cfg->scan_status);
 		return -EAGAIN;
 	}
@@ -3393,8 +3415,8 @@ static int brcmf_cfg80211_sched_scan_stop(struct wiphy *wiphy,
 	struct brcmf_if *ifp = netdev_priv(ndev);
 
 	brcmf_dbg(SCAN, "enter\n");
-	brcmf_pno_clean(ifp);
-	if (cfg->internal_escan)
+	brcmf_pno_stop_sched_scan(ifp, reqid);
+	if (cfg->int_escan_map)
 		brcmf_notify_escan_complete(cfg, ifp, true, true);
 	return 0;
 }
@@ -6914,6 +6936,13 @@ struct brcmf_cfg80211_info *brcmf_cfg80211_attach(struct brcmf_pub *drvr,
 		brcmf_p2p_detach(&cfg->p2p);
 		goto wiphy_unreg_out;
 	}
+	err = brcmf_pno_attach(cfg);
+	if (err) {
+		brcmf_err("PNO initialisation failed (%d)\n", err);
+		brcmf_btcoex_detach(cfg);
+		brcmf_p2p_detach(&cfg->p2p);
+		goto wiphy_unreg_out;
+	}
 
 	if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_TDLS)) {
 		err = brcmf_fil_iovar_int_set(ifp, "tdls_enable", 1);
@@ -6946,6 +6975,7 @@ struct brcmf_cfg80211_info *brcmf_cfg80211_attach(struct brcmf_pub *drvr,
 	return cfg;
 
 detach:
+	brcmf_pno_detach(cfg);
 	brcmf_btcoex_detach(cfg);
 	brcmf_p2p_detach(&cfg->p2p);
 wiphy_unreg_out:
@@ -6965,6 +6995,7 @@ void brcmf_cfg80211_detach(struct brcmf_cfg80211_info *cfg)
 	if (!cfg)
 		return;
 
+	brcmf_pno_detach(cfg);
 	brcmf_btcoex_detach(cfg);
 	wiphy_unregister(cfg->wiphy);
 	kfree(cfg->ops);
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h
index a1c2e0a..12ff154 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h
@@ -273,7 +273,7 @@ struct brcmf_cfg80211_wowl {
  * @pub: common driver information.
  * @channel: current channel.
  * @active_scan: current scan mode.
- * @internal_escan: indicates internally initiated e-scan is running.
+ * @int_escan_map: bucket map for which internal e-scan is done.
  * @ibss_starter: indicates this sta is ibss starter.
  * @pwr_save: indicate whether dongle to support power save mode.
  * @dongle_up: indicate whether dongle up or not.
@@ -289,6 +289,7 @@ struct brcmf_cfg80211_wowl {
  * @vif_cnt: number of vif instances.
  * @vif_event: vif event signalling.
  * @wowl: wowl related information.
+ * @pno: information of pno module.
  */
 struct brcmf_cfg80211_info {
 	struct wiphy *wiphy;
@@ -305,7 +306,7 @@ struct brcmf_cfg80211_info {
 	struct brcmf_pub *pub;
 	u32 channel;
 	bool active_scan;
-	bool internal_escan;
+	u32 int_escan_map;
 	bool ibss_starter;
 	bool pwr_save;
 	bool dongle_up;
@@ -322,6 +323,7 @@ struct brcmf_cfg80211_info {
 	struct brcmu_d11inf d11inf;
 	struct brcmf_assoclist_le assoclist;
 	struct brcmf_cfg80211_wowl wowl;
+	struct brcmf_pno_info *pno;
 };
 
 /**
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
index 60da86a..5beec1d 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
@@ -30,6 +30,7 @@
 #include "debug.h"
 #include "fwil_types.h"
 #include "p2p.h"
+#include "pno.h"
 #include "cfg80211.h"
 #include "fwil.h"
 #include "fwsignal.h"
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h
index 0661261..4a80123 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h
@@ -74,6 +74,7 @@
 #define BRCMF_EVENT_ON()	(brcmf_msg_level & BRCMF_EVENT_VAL)
 #define BRCMF_FIL_ON()		(brcmf_msg_level & BRCMF_FIL_VAL)
 #define BRCMF_FWCON_ON()	(brcmf_msg_level & BRCMF_FWCON_VAL)
+#define BRCMF_SCAN_ON()		(brcmf_msg_level & BRCMF_SCAN_VAL)
 
 #else /* defined(DEBUG) || defined(CONFIG_BRCM_TRACING) */
 
@@ -87,6 +88,7 @@
 #define BRCMF_EVENT_ON()	0
 #define BRCMF_FIL_ON()		0
 #define BRCMF_FWCON_ON()	0
+#define BRCMF_SCAN_ON()		0
 
 #endif /* defined(DEBUG) || defined(CONFIG_BRCM_TRACING) */
 
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h
index 8c18fad..cc832ab 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h
@@ -835,15 +835,17 @@ struct brcmf_gtk_keyinfo_le {
 	u8 replay_counter[BRCMF_RSN_REPLAY_LEN];
 };
 
+#define BRCMF_PNO_REPORT_NO_BATCH	BIT(2)
+
 /**
  * struct brcmf_gscan_bucket_config - configuration data for channel bucket.
  *
- * @bucket_end_index: !unknown!
- * @bucket_freq_multiple: !unknown!
- * @flag: !unknown!
- * @reserved: !unknown!
- * @repeat: !unknown!
- * @max_freq_multiple: !unknown!
+ * @bucket_end_index: last channel index in @channel_list in @struct brcmf_pno_config_le.
+ * @bucket_freq_multiple: scan interval expressed in N * @scan_freq.
+ * @flag: channel bucket report flags.
+ * @reserved: for future use.
+ * @repeat: number of scan at interval for exponential scan.
+ * @max_freq_multiple: maximum scan interval for exponential scan.
  */
 struct brcmf_gscan_bucket_config {
 	u8 bucket_end_index;
@@ -855,16 +857,19 @@ struct brcmf_gscan_bucket_config {
 };
 
 /* version supported which must match firmware */
-#define BRCMF_GSCAN_CFG_VERSION                     1
+#define BRCMF_GSCAN_CFG_VERSION                     2
 
 /**
  * enum brcmf_gscan_cfg_flags - bit values for gscan flags.
  *
  * @BRCMF_GSCAN_CFG_FLAGS_ALL_RESULTS: send probe responses/beacons to host.
+ * @BRCMF_GSCAN_CFG_ALL_BUCKETS_IN_1ST_SCAN: all buckets will be included in
+ *	first scan cycle.
  * @BRCMF_GSCAN_CFG_FLAGS_CHANGE_ONLY: indicated only flags member is changed.
  */
 enum brcmf_gscan_cfg_flags {
 	BRCMF_GSCAN_CFG_FLAGS_ALL_RESULTS = BIT(0),
+	BRCMF_GSCAN_CFG_ALL_BUCKETS_IN_1ST_SCAN = BIT(3),
 	BRCMF_GSCAN_CFG_FLAGS_CHANGE_ONLY = BIT(7),
 };
 
@@ -884,12 +889,12 @@ enum brcmf_gscan_cfg_flags {
  */
 struct brcmf_gscan_config {
 	__le16 version;
-	u8  flags;
-	u8   buffer_threshold;
-	u8   swc_nbssid_threshold;
-	u8  swc_rssi_window_size;
-	u8  count_of_channel_buckets;
-	u8  retry_threshold;
+	u8 flags;
+	u8 buffer_threshold;
+	u8 swc_nbssid_threshold;
+	u8 swc_rssi_window_size;
+	u8 count_of_channel_buckets;
+	u8 retry_threshold;
 	__le16  lost_ap_window;
 	struct brcmf_gscan_bucket_config bucket[1];
 };
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pno.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pno.c
index cc0e6a4..d0e4283 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pno.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pno.c
@@ -14,6 +14,7 @@
  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 #include <linux/netdevice.h>
+#include <linux/gcd.h>
 #include <net/cfg80211.h>
 
 #include "core.h"
@@ -35,6 +36,59 @@
 #define BRCMF_PNO_HIDDEN_BIT		2
 #define BRCMF_PNO_SCHED_SCAN_PERIOD	30
 
+#define BRCMF_PNO_MAX_BUCKETS		16
+#define GSCAN_BATCH_NO_THR_SET			101
+#define GSCAN_RETRY_THRESHOLD			3
+
+struct brcmf_pno_info {
+	int n_reqs;
+	struct cfg80211_sched_scan_request *reqs[BRCMF_PNO_MAX_BUCKETS];
+};
+
+#define ifp_to_pno(_ifp)	(_ifp)->drvr->config->pno
+
+static int brcmf_pno_store_request(struct brcmf_pno_info *pi,
+				   struct cfg80211_sched_scan_request *req)
+{
+	if (WARN_ON(pi->n_reqs == BRCMF_PNO_MAX_BUCKETS)) {
+		brcmf_err("pno request storage full\n");
+		return -ENOSPC;
+	}
+	brcmf_dbg(SCAN, "reqid=%llu\n", req->reqid);
+	pi->reqs[pi->n_reqs++] = req;
+	return 0;
+}
+
+static int brcmf_pno_remove_request(struct brcmf_pno_info *pi, u64 reqid)
+{
+	int i;
+
+	/* find request */
+	for (i = 0; i < pi->n_reqs; i++) {
+		if (pi->reqs[i]->reqid == reqid)
+			break;
+	}
+	/* request not found */
+	if (WARN_ON(i == pi->n_reqs)) {
+		brcmf_err("reqid not found\n");
+		return -ENOENT;
+	}
+
+	brcmf_dbg(SCAN, "reqid=%llu\n", reqid);
+	pi->n_reqs--;
+
+	/* if last we are done */
+	if (!pi->n_reqs || i == pi->n_reqs)
+		return 0;
+
+	/* fill the gap with remaining requests */
+	while (i <= pi->n_reqs - 1) {
+		pi->reqs[i] = pi->reqs[i + 1];
+		i++;
+	}
+	return 0;
+}
+
 static int brcmf_pno_channel_config(struct brcmf_if *ifp,
 				    struct brcmf_pno_config_le *cfg)
 {
@@ -63,10 +117,6 @@ static int brcmf_pno_config(struct brcmf_if *ifp, u32 scan_freq,
 	pfn_param.exp = BRCMF_PNO_FREQ_EXPO_MAX;
 
 	/* set up pno scan fr */
-	if (scan_freq < BRCMF_PNO_SCHED_SCAN_MIN_PERIOD) {
-		brcmf_dbg(SCAN, "scan period too small, using minimum\n");
-		scan_freq = BRCMF_PNO_SCHED_SCAN_MIN_PERIOD;
-	}
 	pfn_param.scan_freq = cpu_to_le32(scan_freq);
 
 	if (mscan) {
@@ -101,12 +151,24 @@ static int brcmf_pno_config(struct brcmf_if *ifp, u32 scan_freq,
 	return err;
 }
 
-static int brcmf_pno_set_random(struct brcmf_if *ifp, u8 *mac_addr,
-				u8 *mac_mask)
+static int brcmf_pno_set_random(struct brcmf_if *ifp, struct brcmf_pno_info *pi)
 {
 	struct brcmf_pno_macaddr_le pfn_mac;
+	u8 *mac_addr;
+	u8 *mac_mask;
 	int err, i;
 
+	for (i = 0; i < pi->n_reqs; i++)
+		if (pi->reqs[i]->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) {
+			mac_addr = pi->reqs[i]->mac_addr;
+			mac_mask = pi->reqs[i]->mac_addr_mask;
+			break;
+		}
+
+	/* no random mac requested */
+	if (i == pi->n_reqs)
+		return 0;
+
 	pfn_mac.version = BRCMF_PFN_MACADDR_CFG_VER;
 	pfn_mac.flags = BRCMF_PFN_MAC_OUI_ONLY | BRCMF_PFN_SET_MAC_UNASSOC;
 
@@ -120,6 +182,8 @@ static int brcmf_pno_set_random(struct brcmf_if *ifp, u8 *mac_addr,
 	/* Set locally administered */
 	pfn_mac.mac[0] |= 0x02;
 
+	brcmf_dbg(SCAN, "enabling random mac: reqid=%llu mac=%pM\n",
+		  pi->reqs[i]->reqid, pfn_mac.mac);
 	err = brcmf_fil_iovar_data_set(ifp, "pfn_macaddr", &pfn_mac,
 				       sizeof(pfn_mac));
 	if (err)
@@ -163,7 +227,7 @@ static bool brcmf_is_ssid_active(struct cfg80211_ssid *ssid,
 	return false;
 }
 
-int brcmf_pno_clean(struct brcmf_if *ifp)
+static int brcmf_pno_clean(struct brcmf_if *ifp)
 {
 	int ret;
 
@@ -179,75 +243,307 @@ int brcmf_pno_clean(struct brcmf_if *ifp)
 	return ret;
 }
 
-int brcmf_pno_start_sched_scan(struct brcmf_if *ifp,
-			       struct cfg80211_sched_scan_request *req)
+static int brcmf_pno_get_bucket_channels(struct cfg80211_sched_scan_request *r,
+					 struct brcmf_pno_config_le *pno_cfg)
 {
-	struct brcmu_d11inf *d11inf;
-	struct brcmf_pno_config_le pno_cfg;
-	struct cfg80211_ssid *ssid;
+	u32 n_chan = le32_to_cpu(pno_cfg->channel_num);
 	u16 chan;
-	int i, ret;
+	int i, err = 0;
 
-	/* clean up everything */
-	ret = brcmf_pno_clean(ifp);
-	if  (ret < 0) {
-		brcmf_err("failed error=%d\n", ret);
-		return ret;
+	for (i = 0; i < r->n_channels; i++) {
+		if (n_chan >= BRCMF_NUMCHANNELS) {
+			err = -ENOSPC;
+			goto done;
+		}
+		chan = r->channels[i]->hw_value;
+		brcmf_dbg(SCAN, "[%d] Chan : %u\n", n_chan, chan);
+		pno_cfg->channel_list[n_chan++] = cpu_to_le16(chan);
 	}
+	/* return number of channels */
+	err = n_chan;
+done:
+	pno_cfg->channel_num = cpu_to_le32(n_chan);
+	return err;
+}
 
-	/* configure pno */
-	ret = brcmf_pno_config(ifp, req->scan_plans[0].interval, 0, 0);
-	if (ret < 0)
-		return ret;
-
-	/* configure random mac */
-	if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) {
-		ret = brcmf_pno_set_random(ifp, req->mac_addr,
-					   req->mac_addr_mask);
-		if (ret < 0)
-			return ret;
+static int brcmf_pno_prep_fwconfig(struct brcmf_pno_info *pi,
+				   struct brcmf_pno_config_le *pno_cfg,
+				   struct brcmf_gscan_bucket_config **buckets,
+				   u32 *scan_freq)
+{
+	struct cfg80211_sched_scan_request *sr;
+	struct brcmf_gscan_bucket_config *fw_buckets;
+	int i, err, chidx;
+
+	brcmf_dbg(SCAN, "n_reqs=%d\n", pi->n_reqs);
+	if (WARN_ON(!pi->n_reqs))
+		return -ENODATA;
+
+	/*
+	 * actual scan period is determined using gcd() for each
+	 * scheduled scan period.
+	 */
+	*scan_freq = pi->reqs[0]->scan_plans[0].interval;
+	for (i = 1; i < pi->n_reqs; i++) {
+		sr = pi->reqs[i];
+		*scan_freq = gcd(sr->scan_plans[0].interval, *scan_freq);
+	}
+	if (*scan_freq < BRCMF_PNO_SCHED_SCAN_MIN_PERIOD) {
+		brcmf_dbg(SCAN, "scan period too small, using minimum\n");
+		*scan_freq = BRCMF_PNO_SCHED_SCAN_MIN_PERIOD;
 	}
 
-	/* configure channels to use */
-	d11inf = &ifp->drvr->config->d11inf;
-	for (i = 0; i < req->n_channels; i++) {
-		chan = req->channels[i]->hw_value;
-		pno_cfg.channel_list[i] = cpu_to_le16(chan);
+	*buckets = NULL;
+	fw_buckets = kcalloc(pi->n_reqs, sizeof(*fw_buckets), GFP_KERNEL);
+	if (!fw_buckets)
+		return -ENOMEM;
+
+	memset(pno_cfg, 0, sizeof(*pno_cfg));
+	for (i = 0; i < pi->n_reqs; i++) {
+		sr = pi->reqs[i];
+		chidx = brcmf_pno_get_bucket_channels(sr, pno_cfg);
+		if (chidx < 0) {
+			err = chidx;
+			goto fail;
+		}
+		fw_buckets[i].bucket_end_index = chidx - 1;
+		fw_buckets[i].bucket_freq_multiple =
+			sr->scan_plans[0].interval / *scan_freq;
+		/* assure period is non-zero */
+		if (!fw_buckets[i].bucket_freq_multiple)
+			fw_buckets[i].bucket_freq_multiple = 1;
+		fw_buckets[i].flag = BRCMF_PNO_REPORT_NO_BATCH;
 	}
-	if (req->n_channels) {
-		pno_cfg.channel_num = cpu_to_le32(req->n_channels);
-		brcmf_pno_channel_config(ifp, &pno_cfg);
+
+	if (BRCMF_SCAN_ON()) {
+		brcmf_err("base period=%u\n", *scan_freq);
+		for (i = 0; i < pi->n_reqs; i++) {
+			brcmf_err("[%d] period %u max %u repeat %u flag %x idx %u\n",
+				  i, fw_buckets[i].bucket_freq_multiple,
+				  le16_to_cpu(fw_buckets[i].max_freq_multiple),
+				  fw_buckets[i].repeat, fw_buckets[i].flag,
+				  fw_buckets[i].bucket_end_index);
+		}
 	}
+	*buckets = fw_buckets;
+	return pi->n_reqs;
 
-	/* configure each match set */
-	for (i = 0; i < req->n_match_sets; i++) {
-		ssid = &req->match_sets[i].ssid;
-		if (!ssid->ssid_len) {
-			brcmf_err("skip broadcast ssid\n");
-			continue;
+fail:
+	kfree(fw_buckets);
+	return err;
+}
+
+static int brcmf_pno_config_ssids(struct brcmf_if *ifp,
+				  struct brcmf_pno_info *pi)
+{
+	struct cfg80211_sched_scan_request *r;
+	struct cfg80211_match_set *ms;
+	bool active;
+	int i, j, err;
+
+	for (i = 0; i < pi->n_reqs; i++) {
+		r = pi->reqs[i];
+
+		for (j = 0; j < r->n_match_sets; j++) {
+			ms = &r->match_sets[j];
+			if (!ms->ssid.ssid_len)
+				continue;
+			active = brcmf_is_ssid_active(&ms->ssid, r);
+			brcmf_dbg(SCAN, "adding %.32s (active=%d)\n",
+				  ms->ssid.ssid, active);
+			err = brcmf_pno_add_ssid(ifp, &ms->ssid, active);
+			if (err < 0) {
+				brcmf_err("adding failed: err=%d\n", err);
+				return err;
+			}
 		}
+	}
+	return 0;
+}
+
+static int brcmf_pno_config_sched_scans(struct brcmf_if *ifp)
+{
+	struct brcmf_pno_info *pi;
+	struct brcmf_gscan_config *gscan_cfg;
+	struct brcmf_gscan_bucket_config *buckets;
+	struct brcmf_pno_config_le pno_cfg;
+	size_t gsz;
+	u32 scan_freq;
+	int err, n_buckets;
+
+	pi = ifp_to_pno(ifp);
+	n_buckets = brcmf_pno_prep_fwconfig(pi, &pno_cfg, &buckets,
+					    &scan_freq);
+	if (n_buckets < 0)
+		return n_buckets;
+
+	gsz = sizeof(*gscan_cfg) + (n_buckets - 1) * sizeof(*buckets);
+	gscan_cfg = kzalloc(gsz, GFP_KERNEL);
+	if (!gscan_cfg) {
+		err = -ENOMEM;
+		goto free_buckets;
+	}
 
-		ret = brcmf_pno_add_ssid(ifp, ssid,
-					 brcmf_is_ssid_active(ssid, req));
-		if (ret < 0)
-			brcmf_dbg(SCAN, ">>> PNO filter %s for ssid (%s)\n",
-				  ret == 0 ? "set" : "failed", ssid->ssid);
+	/* clean up everything */
+	err = brcmf_pno_clean(ifp);
+	if  (err < 0) {
+		brcmf_err("failed error=%d\n", err);
+		goto free_gscan;
 	}
+
+	/* configure pno */
+	err = brcmf_pno_config(ifp, scan_freq, 0, 0);
+	if (err < 0)
+		goto free_gscan;
+
+	err = brcmf_pno_channel_config(ifp, &pno_cfg);
+	if (err < 0)
+		goto clean;
+
+	gscan_cfg->version = cpu_to_le16(BRCMF_GSCAN_CFG_VERSION);
+	gscan_cfg->retry_threshold = GSCAN_RETRY_THRESHOLD;
+	gscan_cfg->buffer_threshold = GSCAN_BATCH_NO_THR_SET;
+	gscan_cfg->flags = BRCMF_GSCAN_CFG_ALL_BUCKETS_IN_1ST_SCAN;
+
+	gscan_cfg->count_of_channel_buckets = n_buckets;
+	memcpy(&gscan_cfg->bucket[0], buckets,
+	       n_buckets * sizeof(*buckets));
+
+	err = brcmf_fil_iovar_data_set(ifp, "pfn_gscan_cfg", gscan_cfg, gsz);
+
+	if (err < 0)
+		goto clean;
+
+	/* configure random mac */
+	err = brcmf_pno_set_random(ifp, pi);
+	if (err < 0)
+		goto clean;
+
+	err = brcmf_pno_config_ssids(ifp, pi);
+	if (err < 0)
+		goto clean;
+
 	/* Enable the PNO */
-	ret = brcmf_fil_iovar_int_set(ifp, "pfn", 1);
+	err = brcmf_fil_iovar_int_set(ifp, "pfn", 1);
+
+clean:
+	if (err < 0)
+		brcmf_pno_clean(ifp);
+free_gscan:
+	kfree(gscan_cfg);
+free_buckets:
+	kfree(buckets);
+	return err;
+}
+
+int brcmf_pno_start_sched_scan(struct brcmf_if *ifp,
+			       struct cfg80211_sched_scan_request *req)
+{
+	struct brcmf_pno_info *pi;
+	int ret;
+
+	brcmf_dbg(TRACE, "reqid=%llu\n", req->reqid);
+
+	pi = ifp_to_pno(ifp);
+	ret = brcmf_pno_store_request(pi, req);
 	if (ret < 0)
-		brcmf_err("PNO enable failed!! ret=%d\n", ret);
+		return ret;
 
-	return ret;
+	ret = brcmf_pno_config_sched_scans(ifp);
+	if (ret < 0) {
+		brcmf_pno_remove_request(pi, req->reqid);
+		if (pi->n_reqs)
+			(void)brcmf_pno_config_sched_scans(ifp);
+		return ret;
+	}
+	return 0;
+}
+
+int brcmf_pno_stop_sched_scan(struct brcmf_if *ifp, u64 reqid)
+{
+	struct brcmf_pno_info *pi;
+	int err;
+
+	brcmf_dbg(TRACE, "reqid=%llu\n", reqid);
+
+	pi = ifp_to_pno(ifp);
+	err = brcmf_pno_remove_request(pi, reqid);
+	if (err)
+		return err;
+
+	brcmf_pno_clean(ifp);
+
+	if (pi->n_reqs)
+		(void)brcmf_pno_config_sched_scans(ifp);
+
+	return 0;
+}
+
+int brcmf_pno_attach(struct brcmf_cfg80211_info *cfg)
+{
+	struct brcmf_pno_info *pi;
+
+	brcmf_err("enter\n");
+	pi = kzalloc(sizeof(*pi), GFP_KERNEL);
+	if (!pi)
+		return -ENOMEM;
+
+	cfg->pno = pi;
+	return 0;
+}
+
+void brcmf_pno_detach(struct brcmf_cfg80211_info *cfg)
+{
+	struct brcmf_pno_info *pi;
+
+	brcmf_err("enter\n");
+	pi = cfg->pno;
+	cfg->pno = NULL;
+
+	WARN_ON(pi->n_reqs);
+	kfree(pi);
 }
 
 void brcmf_pno_wiphy_params(struct wiphy *wiphy, bool gscan)
 {
 	/* scheduled scan settings */
-	wiphy->max_sched_scan_reqs = gscan ? 2 : 1;
+	wiphy->max_sched_scan_reqs = gscan ? BRCMF_PNO_MAX_BUCKETS : 1;
 	wiphy->max_sched_scan_ssids = BRCMF_PNO_MAX_PFN_COUNT;
 	wiphy->max_match_sets = BRCMF_PNO_MAX_PFN_COUNT;
 	wiphy->max_sched_scan_ie_len = BRCMF_SCAN_IE_LEN_MAX;
 	wiphy->max_sched_scan_plan_interval = BRCMF_PNO_SCHED_SCAN_MAX_PERIOD;
 }
 
+u64 brcmf_pno_find_reqid_by_bucket(struct brcmf_pno_info *pi, u32 bucket)
+{
+	/* bucket appears to be gone */
+	if (bucket >= pi->n_reqs)
+		return 0;
+
+	return pi->reqs[bucket]->reqid;
+}
+
+u32 brcmf_pno_get_bucket_map(struct brcmf_pno_info *pi,
+			     struct brcmf_pno_net_info_le *ni)
+{
+	struct cfg80211_sched_scan_request *req;
+	struct cfg80211_match_set *ms;
+	u32 bucket_map = 0;
+	int i, j;
+
+	for (i = 0; i < pi->n_reqs; i++) {
+		req = pi->reqs[i];
+
+		if (!req->n_match_sets)
+			continue;
+		for (j = 0; j < req->n_match_sets; j++) {
+			ms = &req->match_sets[j];
+			if (ms->ssid.ssid_len == ni->SSID_len &&
+			    !strncmp(ms->ssid.ssid, ni->SSID, ni->SSID_len)) {
+				bucket_map |= BIT(i);
+				break;
+			}
+		}
+	}
+	return bucket_map;
+}
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pno.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pno.h
index 07ec51f..cd9e35a 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pno.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pno.h
@@ -21,12 +21,8 @@
 #define BRCMF_PNO_SCHED_SCAN_MIN_PERIOD	10
 #define BRCMF_PNO_SCHED_SCAN_MAX_PERIOD	508
 
-/**
- * brcmf_pno_clean - disable and clear pno in firmware.
- *
- * @ifp: interface object used.
- */
-int brcmf_pno_clean(struct brcmf_if *ifp);
+/* forward declaration */
+struct brcmf_pno_info;
 
 /**
  * brcmf_pno_start_sched_scan - initiate scheduled scan on device.
@@ -38,6 +34,14 @@ int brcmf_pno_start_sched_scan(struct brcmf_if *ifp,
 			       struct cfg80211_sched_scan_request *req);
 
 /**
+ * brcmf_pno_stop_sched_scan - terminate scheduled scan on device.
+ *
+ * @ifp: interface object used.
+ * @reqid: unique identifier of scan to be stopped.
+ */
+int brcmf_pno_stop_sched_scan(struct brcmf_if *ifp, u64 reqid);
+
+/**
  * brcmf_pno_wiphy_params - fill scheduled scan parameters in wiphy instance.
  *
  * @wiphy: wiphy instance to be used.
@@ -45,4 +49,35 @@ int brcmf_pno_start_sched_scan(struct brcmf_if *ifp,
  */
 void brcmf_pno_wiphy_params(struct wiphy *wiphy, bool gscan);
 
+/**
+ * brcmf_pno_attach - allocate and attach module information.
+ *
+ * @cfg: cfg80211 context used.
+ */
+int brcmf_pno_attach(struct brcmf_cfg80211_info *cfg);
+
+/**
+ * brcmf_pno_detach - detach and free module information.
+ *
+ * @cfg: cfg80211 context used.
+ */
+void brcmf_pno_detach(struct brcmf_cfg80211_info *cfg);
+
+/**
+ * brcmf_pno_find_reqid_by_bucket - find request id for given bucket index.
+ *
+ * @pi: pno instance used.
+ * @bucket: index of firmware bucket.
+ */
+u64 brcmf_pno_find_reqid_by_bucket(struct brcmf_pno_info *pi, u32 bucket);
+
+/**
+ * brcmf_pno_get_bucket_map - determine bucket map for given netinfo.
+ *
+ * @pi: pno instance used.
+ * @netinfo: netinfo to compare with bucket configuration.
+ */
+u32 brcmf_pno_get_bucket_map(struct brcmf_pno_info *pi,
+			     struct brcmf_pno_net_info_le *netinfo);
+
 #endif /* _BRCMF_PNO_H */
-- 
1.9.1