wil6210: support Scheduled scan

Add support for sched_scan_start/stop by sending PNO commands to FW.
Driver reports max_sched_scan_reqs and invokes
cfg80211_sched_scan_results upon receiving WMI_SCHED_SCAN_RESULT_EVENTID
from FW.
Signed-off-by: Dedy Lansky <qca_dlansky@qca.qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/wil6210/cfg80211.c

@@ -1751,6 +1751,69 @@ static int wil_cfg80211_resume(struct wiphy *wiphy)
 	return 0;
 }
 
+static int
+wil_cfg80211_sched_scan_start(struct wiphy *wiphy,
+			      struct net_device *dev,
+			      struct cfg80211_sched_scan_request *request)
+{
+	struct wil6210_priv *wil = wiphy_to_wil(wiphy);
+	int i, rc;
+
+	wil_dbg_misc(wil,
+		     "sched scan start: n_ssids %d, ie_len %zu, flags 0x%x\n",
+		     request->n_ssids, request->ie_len, request->flags);
+	for (i = 0; i < request->n_ssids; i++) {
+		wil_dbg_misc(wil, "SSID[%d]:", i);
+		wil_hex_dump_misc("SSID ", DUMP_PREFIX_OFFSET, 16, 1,
+				  request->ssids[i].ssid,
+				  request->ssids[i].ssid_len, true);
+	}
+	wil_dbg_misc(wil, "channels:");
+	for (i = 0; i < request->n_channels; i++)
+		wil_dbg_misc(wil, " %d%s", request->channels[i]->hw_value,
+			     i == request->n_channels - 1 ? "\n" : "");
+	wil_dbg_misc(wil, "n_match_sets %d, min_rssi_thold %d, delay %d\n",
+		     request->n_match_sets, request->min_rssi_thold,
+		     request->delay);
+	for (i = 0; i < request->n_match_sets; i++) {
+		struct cfg80211_match_set *ms = &request->match_sets[i];
+
+		wil_dbg_misc(wil, "MATCHSET[%d]: rssi_thold %d\n",
+			     i, ms->rssi_thold);
+		wil_hex_dump_misc("SSID ", DUMP_PREFIX_OFFSET, 16, 1,
+				  ms->ssid.ssid,
+				  ms->ssid.ssid_len, true);
+	}
+	wil_dbg_misc(wil, "n_scan_plans %d\n", request->n_scan_plans);
+	for (i = 0; i < request->n_scan_plans; i++) {
+		struct cfg80211_sched_scan_plan *sp = &request->scan_plans[i];
+
+		wil_dbg_misc(wil, "SCAN PLAN[%d]: interval %d iterations %d\n",
+			     i, sp->interval, sp->iterations);
+	}
+
+	rc = wmi_set_ie(wil, WMI_FRAME_PROBE_REQ, request->ie_len, request->ie);
+	if (rc)
+		return rc;
+	return wmi_start_sched_scan(wil, request);
+}
+
+static int
+wil_cfg80211_sched_scan_stop(struct wiphy *wiphy, struct net_device *dev,
+			     u64 reqid)
+{
+	struct wil6210_priv *wil = wiphy_to_wil(wiphy);
+	int rc;
+
+	rc = wmi_stop_sched_scan(wil);
+	/* device would return error if it thinks PNO is already stopped.
+	 * ignore the return code so user space and driver gets back in-sync
+	 */
+	wil_dbg_misc(wil, "sched scan stopped (%d)\n", rc);
+
+	return 0;
+}
+
 static const struct cfg80211_ops wil_cfg80211_ops = {
 	.add_virtual_intf = wil_cfg80211_add_iface,
 	.del_virtual_intf = wil_cfg80211_del_iface,
@@ -1784,6 +1847,8 @@ static const struct cfg80211_ops wil_cfg80211_ops = {
 	.set_power_mgmt = wil_cfg80211_set_power_mgmt,
 	.suspend = wil_cfg80211_suspend,
 	.resume = wil_cfg80211_resume,
+	.sched_scan_start = wil_cfg80211_sched_scan_start,
+	.sched_scan_stop = wil_cfg80211_sched_scan_stop,
 };
 
 static void wil_wiphy_init(struct wiphy *wiphy)

drivers/net/wireless/ath/wil6210/main.c

@@ -785,6 +785,14 @@ void wil_refresh_fw_capabilities(struct wil6210_priv *wil)
 		wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 	else
 		wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
+
+	if (test_bit(WMI_FW_CAPABILITY_PNO, wil->fw_capabilities)) {
+		wiphy->max_sched_scan_reqs = 1;
+		wiphy->max_sched_scan_ssids = WMI_MAX_PNO_SSID_NUM;
+		wiphy->max_match_sets = WMI_MAX_PNO_SSID_NUM;
+		wiphy->max_sched_scan_ie_len = WMI_MAX_IE_LEN;
+		wiphy->max_sched_scan_plans = WMI_MAX_PLANS_NUM;
+	}
 }
 
 void wil_mbox_ring_le2cpus(struct wil6210_mbox_ring *r)

drivers/net/wireless/ath/wil6210/wil6210.h

@@ -1030,4 +1030,8 @@ void wil_halp_unvote(struct wil6210_priv *wil);
 void wil6210_set_halp(struct wil6210_priv *wil);
 void wil6210_clear_halp(struct wil6210_priv *wil);
 
+int wmi_start_sched_scan(struct wil6210_priv *wil,
+			 struct cfg80211_sched_scan_request *request);
+int wmi_stop_sched_scan(struct wil6210_priv *wil);
+
 #endif /* __WIL6210_H__ */

drivers/net/wireless/ath/wil6210/wmi.c

@@ -38,6 +38,7 @@ MODULE_PARM_DESC(led_id,
 		 " 60G device led enablement. Set the led ID (0-2) to enable");
 
 #define WIL_WAIT_FOR_SUSPEND_RESUME_COMP 200
+#define WIL_WMI_CALL_GENERAL_TO_MS 100
 
 /**
  * WMI event receiving - theory of operations
@@ -314,6 +315,10 @@ static const char *cmdid2name(u16 cmdid)
 		return "WMI_LINK_MAINTAIN_CFG_WRITE_CMD";
 	case WMI_LO_POWER_CALIB_FROM_OTP_CMDID:
 		return "WMI_LO_POWER_CALIB_FROM_OTP_CMD";
+	case WMI_START_SCHED_SCAN_CMDID:
+		return "WMI_START_SCHED_SCAN_CMD";
+	case WMI_STOP_SCHED_SCAN_CMDID:
+		return "WMI_STOP_SCHED_SCAN_CMD";
 	default:
 		return "Untracked CMD";
 	}
@@ -428,6 +433,12 @@ static const char *eventid2name(u16 eventid)
 		return "WMI_LINK_MAINTAIN_CFG_WRITE_DONE_EVENT";
 	case WMI_LO_POWER_CALIB_FROM_OTP_EVENTID:
 		return "WMI_LO_POWER_CALIB_FROM_OTP_EVENT";
+	case WMI_START_SCHED_SCAN_EVENTID:
+		return "WMI_START_SCHED_SCAN_EVENT";
+	case WMI_STOP_SCHED_SCAN_EVENTID:
+		return "WMI_STOP_SCHED_SCAN_EVENT";
+	case WMI_SCHED_SCAN_RESULT_EVENTID:
+		return "WMI_SCHED_SCAN_RESULT_EVENT";
 	default:
 		return "Untracked EVENT";
 	}
@@ -1066,6 +1077,75 @@ __acquires(&sta->tid_rx_lock) __releases(&sta->tid_rx_lock)
 	spin_unlock_bh(&sta->tid_rx_lock);
 }
 
+static void
+wmi_evt_sched_scan_result(struct wil6210_priv *wil, int id, void *d, int len)
+{
+	struct wmi_sched_scan_result_event *data = d;
+	struct wiphy *wiphy = wil_to_wiphy(wil);
+	struct ieee80211_mgmt *rx_mgmt_frame =
+		(struct ieee80211_mgmt *)data->payload;
+	int flen = len - offsetof(struct wmi_sched_scan_result_event, payload);
+	int ch_no;
+	u32 freq;
+	struct ieee80211_channel *channel;
+	s32 signal;
+	__le16 fc;
+	u32 d_len;
+	struct cfg80211_bss *bss;
+
+	if (flen < 0) {
+		wil_err(wil, "sched scan result event too short, len %d\n",
+			len);
+		return;
+	}
+
+	d_len = le32_to_cpu(data->info.len);
+	if (d_len != flen) {
+		wil_err(wil,
+			"sched scan result length mismatch, d_len %d should be %d\n",
+			d_len, flen);
+		return;
+	}
+
+	fc = rx_mgmt_frame->frame_control;
+	if (!ieee80211_is_probe_resp(fc)) {
+		wil_err(wil, "sched scan result invalid frame, fc 0x%04x\n",
+			fc);
+		return;
+	}
+
+	ch_no = data->info.channel + 1;
+	freq = ieee80211_channel_to_frequency(ch_no, NL80211_BAND_60GHZ);
+	channel = ieee80211_get_channel(wiphy, freq);
+	if (test_bit(WMI_FW_CAPABILITY_RSSI_REPORTING, wil->fw_capabilities))
+		signal = 100 * data->info.rssi;
+	else
+		signal = data->info.sqi;
+
+	wil_dbg_wmi(wil, "sched scan result: channel %d MCS %d RSSI %d\n",
+		    data->info.channel, data->info.mcs, data->info.rssi);
+	wil_dbg_wmi(wil, "len %d qid %d mid %d cid %d\n",
+		    d_len, data->info.qid, data->info.mid, data->info.cid);
+	wil_hex_dump_wmi("PROBE ", DUMP_PREFIX_OFFSET, 16, 1, rx_mgmt_frame,
+			 d_len, true);
+
+	if (!channel) {
+		wil_err(wil, "Frame on unsupported channel\n");
+		return;
+	}
+
+	bss = cfg80211_inform_bss_frame(wiphy, channel, rx_mgmt_frame,
+					d_len, signal, GFP_KERNEL);
+	if (bss) {
+		wil_dbg_wmi(wil, "Added BSS %pM\n", rx_mgmt_frame->bssid);
+		cfg80211_put_bss(wiphy, bss);
+	} else {
+		wil_err(wil, "cfg80211_inform_bss_frame() failed\n");
+	}
+
+	cfg80211_sched_scan_results(wiphy, 0);
+}
+
 /**
  * Some events are ignored for purpose; and need not be interpreted as
  * "unhandled events"
@@ -1093,6 +1173,7 @@ static const struct {
 	{WMI_DELBA_EVENTID,		wmi_evt_delba},
 	{WMI_VRING_EN_EVENTID,		wmi_evt_vring_en},
 	{WMI_DATA_PORT_OPEN_EVENTID,		wmi_evt_ignore},
+	{WMI_SCHED_SCAN_RESULT_EVENTID,		wmi_evt_sched_scan_result},
 };
 
 /*
@@ -2284,3 +2365,159 @@ bool wil_is_wmi_idle(struct wil6210_priv *wil)
 	spin_unlock_irqrestore(&wil->wmi_ev_lock, flags);
 	return rc;
 }
+
+static void
+wmi_sched_scan_set_ssids(struct wil6210_priv *wil,
+			 struct wmi_start_sched_scan_cmd *cmd,
+			 struct cfg80211_ssid *ssids, int n_ssids,
+			 struct cfg80211_match_set *match_sets,
+			 int n_match_sets)
+{
+	int i;
+
+	if (n_match_sets > WMI_MAX_PNO_SSID_NUM) {
+		wil_dbg_wmi(wil, "too many match sets (%d), use first %d\n",
+			    n_match_sets, WMI_MAX_PNO_SSID_NUM);
+		n_match_sets = WMI_MAX_PNO_SSID_NUM;
+	}
+	cmd->num_of_ssids = n_match_sets;
+
+	for (i = 0; i < n_match_sets; i++) {
+		struct wmi_sched_scan_ssid_match *wmi_match =
+			&cmd->ssid_for_match[i];
+		struct cfg80211_match_set *cfg_match = &match_sets[i];
+		int j;
+
+		wmi_match->ssid_len = cfg_match->ssid.ssid_len;
+		memcpy(wmi_match->ssid, cfg_match->ssid.ssid,
+		       min_t(u8, wmi_match->ssid_len, WMI_MAX_SSID_LEN));
+		wmi_match->rssi_threshold = S8_MIN;
+		if (cfg_match->rssi_thold >= S8_MIN &&
+		    cfg_match->rssi_thold <= S8_MAX)
+			wmi_match->rssi_threshold = cfg_match->rssi_thold;
+
+		for (j = 0; j < n_ssids; j++)
+			if (wmi_match->ssid_len == ssids[j].ssid_len &&
+			    memcmp(wmi_match->ssid, ssids[j].ssid,
+				   wmi_match->ssid_len) == 0)
+				wmi_match->add_ssid_to_probe = true;
+	}
+}
+
+static void
+wmi_sched_scan_set_channels(struct wil6210_priv *wil,
+			    struct wmi_start_sched_scan_cmd *cmd,
+			    u32 n_channels,
+			    struct ieee80211_channel **channels)
+{
+	int i;
+
+	if (n_channels > WMI_MAX_CHANNEL_NUM) {
+		wil_dbg_wmi(wil, "too many channels (%d), use first %d\n",
+			    n_channels, WMI_MAX_CHANNEL_NUM);
+		n_channels = WMI_MAX_CHANNEL_NUM;
+	}
+	cmd->num_of_channels = n_channels;
+
+	for (i = 0; i < n_channels; i++) {
+		struct ieee80211_channel *cfg_chan = channels[i];
+
+		cmd->channel_list[i] = cfg_chan->hw_value - 1;
+	}
+}
+
+static void
+wmi_sched_scan_set_plans(struct wil6210_priv *wil,
+			 struct wmi_start_sched_scan_cmd *cmd,
+			 struct cfg80211_sched_scan_plan *scan_plans,
+			 int n_scan_plans)
+{
+	int i;
+
+	if (n_scan_plans > WMI_MAX_PLANS_NUM) {
+		wil_dbg_wmi(wil, "too many plans (%d), use first %d\n",
+			    n_scan_plans, WMI_MAX_PLANS_NUM);
+		n_scan_plans = WMI_MAX_PLANS_NUM;
+	}
+
+	for (i = 0; i < n_scan_plans; i++) {
+		struct cfg80211_sched_scan_plan *cfg_plan = &scan_plans[i];
+
+		cmd->scan_plans[i].interval_sec =
+			cpu_to_le16(cfg_plan->interval);
+		cmd->scan_plans[i].num_of_iterations =
+			cpu_to_le16(cfg_plan->iterations);
+	}
+}
+
+int wmi_start_sched_scan(struct wil6210_priv *wil,
+			 struct cfg80211_sched_scan_request *request)
+{
+	int rc;
+	struct wmi_start_sched_scan_cmd cmd = {
+		.min_rssi_threshold = S8_MIN,
+		.initial_delay_sec = cpu_to_le16(request->delay),
+	};
+	struct {
+		struct wmi_cmd_hdr wmi;
+		struct wmi_start_sched_scan_event evt;
+	} __packed reply;
+
+	if (!test_bit(WMI_FW_CAPABILITY_PNO, wil->fw_capabilities))
+		return -ENOTSUPP;
+
+	if (request->min_rssi_thold >= S8_MIN &&
+	    request->min_rssi_thold <= S8_MAX)
+		cmd.min_rssi_threshold = request->min_rssi_thold;
+
+	wmi_sched_scan_set_ssids(wil, &cmd, request->ssids, request->n_ssids,
+				 request->match_sets, request->n_match_sets);
+	wmi_sched_scan_set_channels(wil, &cmd,
+				    request->n_channels, request->channels);
+	wmi_sched_scan_set_plans(wil, &cmd,
+				 request->scan_plans, request->n_scan_plans);
+
+	reply.evt.result = WMI_PNO_REJECT;
+
+	rc = wmi_call(wil, WMI_START_SCHED_SCAN_CMDID, &cmd, sizeof(cmd),
+		      WMI_START_SCHED_SCAN_EVENTID, &reply, sizeof(reply),
+		      WIL_WMI_CALL_GENERAL_TO_MS);
+	if (rc)
+		return rc;
+
+	if (reply.evt.result != WMI_PNO_SUCCESS) {
+		wil_err(wil, "start sched scan failed, result %d\n",
+			reply.evt.result);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+int wmi_stop_sched_scan(struct wil6210_priv *wil)
+{
+	int rc;
+	struct {
+		struct wmi_cmd_hdr wmi;
+		struct wmi_stop_sched_scan_event evt;
+	} __packed reply;
+
+	if (!test_bit(WMI_FW_CAPABILITY_PNO, wil->fw_capabilities))
+		return -ENOTSUPP;
+
+	reply.evt.result = WMI_PNO_REJECT;
+
+	rc = wmi_call(wil, WMI_STOP_SCHED_SCAN_CMDID, NULL, 0,
+		      WMI_STOP_SCHED_SCAN_EVENTID, &reply, sizeof(reply),
+		      WIL_WMI_CALL_GENERAL_TO_MS);
+	if (rc)
+		return rc;
+
+	if (reply.evt.result != WMI_PNO_SUCCESS) {
+		wil_err(wil, "stop sched scan failed, result %d\n",
+			reply.evt.result);
+		return -EINVAL;
+	}
+
+	return 0;
+}

drivers/net/wireless/ath/wil6210/wmi.h

@@ -71,6 +71,7 @@ enum wmi_fw_capability {
 	WMI_FW_CAPABILITY_RSSI_REPORTING		= 12,
 	WMI_FW_CAPABILITY_SET_SILENT_RSSI_TABLE		= 13,
 	WMI_FW_CAPABILITY_LO_POWER_CALIB_FROM_OTP	= 14,
+	WMI_FW_CAPABILITY_PNO				= 15,
 	WMI_FW_CAPABILITY_MAX,
 };
 
@@ -87,6 +88,8 @@ enum wmi_command_id {
 	WMI_CONNECT_CMDID				= 0x01,
 	WMI_DISCONNECT_CMDID				= 0x03,
 	WMI_DISCONNECT_STA_CMDID			= 0x04,
+	WMI_START_SCHED_SCAN_CMDID			= 0x05,
+	WMI_STOP_SCHED_SCAN_CMDID			= 0x06,
 	WMI_START_SCAN_CMDID				= 0x07,
 	WMI_SET_BSS_FILTER_CMDID			= 0x09,
 	WMI_SET_PROBED_SSID_CMDID			= 0x0A,
@@ -385,6 +388,38 @@ struct wmi_start_scan_cmd {
 	} channel_list[0];
 } __packed;
 
+#define WMI_MAX_PNO_SSID_NUM	(16)
+#define WMI_MAX_CHANNEL_NUM	(6)
+#define WMI_MAX_PLANS_NUM	(2)
+
+/* WMI_START_SCHED_SCAN_CMDID */
+struct wmi_sched_scan_ssid_match {
+	u8 ssid_len;
+	u8 ssid[WMI_MAX_SSID_LEN];
+	s8 rssi_threshold;
+	/* boolean */
+	u8 add_ssid_to_probe;
+	u8 reserved;
+} __packed;
+
+/* WMI_START_SCHED_SCAN_CMDID */
+struct wmi_sched_scan_plan {
+	__le16 interval_sec;
+	__le16 num_of_iterations;
+} __packed;
+
+/* WMI_START_SCHED_SCAN_CMDID */
+struct wmi_start_sched_scan_cmd {
+	struct wmi_sched_scan_ssid_match ssid_for_match[WMI_MAX_PNO_SSID_NUM];
+	u8 num_of_ssids;
+	s8 min_rssi_threshold;
+	u8 channel_list[WMI_MAX_CHANNEL_NUM];
+	u8 num_of_channels;
+	u8 reserved;
+	__le16 initial_delay_sec;
+	struct wmi_sched_scan_plan scan_plans[WMI_MAX_PLANS_NUM];
+} __packed;
+
 /* WMI_SET_PROBED_SSID_CMDID */
 #define MAX_PROBED_SSID_INDEX	(3)
 
@@ -1238,6 +1273,9 @@ enum wmi_event_id {
 	WMI_READY_EVENTID				= 0x1001,
 	WMI_CONNECT_EVENTID				= 0x1002,
 	WMI_DISCONNECT_EVENTID				= 0x1003,
+	WMI_START_SCHED_SCAN_EVENTID			= 0x1005,
+	WMI_STOP_SCHED_SCAN_EVENTID			= 0x1006,
+	WMI_SCHED_SCAN_RESULT_EVENTID			= 0x1007,
 	WMI_SCAN_COMPLETE_EVENTID			= 0x100A,
 	WMI_REPORT_STATISTICS_EVENTID			= 0x100B,
 	WMI_RD_MEM_RSP_EVENTID				= 0x1800,
@@ -1600,6 +1638,49 @@ struct wmi_scan_complete_event {
 	__le32 status;
 } __packed;
 
+/* wmi_rx_mgmt_info */
+struct wmi_rx_mgmt_info {
+	u8 mcs;
+	s8 rssi;
+	u8 range;
+	u8 sqi;
+	__le16 stype;
+	__le16 status;
+	__le32 len;
+	/* Not resolved when == 0xFFFFFFFF == > Broadcast to all MIDS */
+	u8 qid;
+	/* Not resolved when == 0xFFFFFFFF == > Broadcast to all MIDS */
+	u8 mid;
+	u8 cid;
+	/* From Radio MNGR */
+	u8 channel;
+} __packed;
+
+/* WMI_START_SCHED_SCAN_EVENTID */
+enum wmi_pno_result {
+	WMI_PNO_SUCCESS			= 0x00,
+	WMI_PNO_REJECT			= 0x01,
+	WMI_PNO_INVALID_PARAMETERS	= 0x02,
+	WMI_PNO_NOT_ENABLED		= 0x03,
+};
+
+struct wmi_start_sched_scan_event {
+	/* pno_result */
+	u8 result;
+	u8 reserved[3];
+} __packed;
+
+struct wmi_stop_sched_scan_event {
+	/* pno_result */
+	u8 result;
+	u8 reserved[3];
+} __packed;
+
+struct wmi_sched_scan_result_event {
+	struct wmi_rx_mgmt_info info;
+	u8 payload[0];
+} __packed;
+
 /* WMI_ACS_PASSIVE_SCAN_COMPLETE_EVENT */
 enum wmi_acs_info_bitmask {
 	WMI_ACS_INFO_BITMASK_BEACON_FOUND	= 0x01,
@@ -1814,24 +1895,6 @@ struct wmi_get_ssid_event {
 	u8 ssid[WMI_MAX_SSID_LEN];
 } __packed;
 
-/* wmi_rx_mgmt_info */
-struct wmi_rx_mgmt_info {
-	u8 mcs;
-	s8 rssi;
-	u8 range;
-	u8 sqi;
-	__le16 stype;
-	__le16 status;
-	__le32 len;
-	/* Not resolved when == 0xFFFFFFFF == > Broadcast to all MIDS */
-	u8 qid;
-	/* Not resolved when == 0xFFFFFFFF == > Broadcast to all MIDS */
-	u8 mid;
-	u8 cid;
-	/* From Radio MNGR */
-	u8 channel;
-} __packed;
-
 /* EVENT: WMI_RF_XPM_READ_RESULT_EVENTID */
 struct wmi_rf_xpm_read_result_event {
 	/* enum wmi_fw_status_e - success=0 or fail=1 */