[PATCH 5.17 104/114] ath11k: reduce the wait time of 11d scan and hw scan while add interface

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

From: Wen Gong <quic_wgong@quicinc.com>

commit bb300130e47fcefbe938f06dbacaef0312e28416 upstream.

(cherry picked from commit 1f682dc9fb3790aa7ec27d3d122ff32b1eda1365 in wireless-next)

Currently ath11k will wait 11d scan complete while add interface in
ath11k_mac_op_add_interface(), when system resume without enable
wowlan, ath11k_mac_op_add_interface() is called for each resume, thus
it increase the resume time of system. And ath11k_mac_op_hw_scan()
after ath11k_mac_op_add_interface() also needs some time cost because
the previous 11d scan need more than 5 seconds when 6 GHz is enabled,
then the scan started event will indicated to ath11k after the 11d
scan completed.

While 11d scan/hw scan is running in firmware, if ath11k update channel
list to firmware by WMI_SCAN_CHAN_LIST_CMDID, then firmware will cancel
the current scan which is running, it lead the scan failed. The patch
commit 9dcf6808b253 ("ath11k: add 11d scan offload support") used
finish_11d_scan/finish_11d_ch_list/pending_11d to synchronize the 11d
scan/hw scan/channel list between ath11k/firmware/mac80211 and to avoid
the scan fail.

Add wait operation before ath11k update channel list, function
ath11k_reg_update_chan_list() will wait until the current 11d scan/hw
scan completed. And remove the wait operation of start 11d scan and
waiting channel list complete in hw scan. After these changes, resume
time cost reduce about 5 seconds and also hw scan time cost reduced
obviously, and scan failed not seen.

The 11d scan is sent to firmware only one time for each interface added
in mac.c, and it is moved after the 1st hw scan because 11d scan will
cost some time and thus leads the AP scan result update to UI delay.
Currently priority of ath11k's hw scan is WMI_SCAN_PRIORITY_LOW, and
priority of 11d scan in firmware is WMI_SCAN_PRIORITY_MEDIUM, then the
11d scan which sent after hw scan will cancel the hw scan in firmware,
so change the priority to WMI_SCAN_PRIORITY_MEDIUM for the hw scan which
is in front of the 11d scan, thus it will not happen scan cancel in
firmware.

Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3

Fixes: 9dcf6808b253 ("ath11k: add 11d scan offload support")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215777
Cc: <stable@vger.kernel.org>
Signed-off-by: Wen Gong <quic_wgong@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220328035832.14122-1-quic_wgong@quicinc.com
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220427111619.9758-1-kvalo@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/wireless/ath/ath11k/core.c |    1 
 drivers/net/wireless/ath/ath11k/core.h |   13 ++++--
 drivers/net/wireless/ath/ath11k/mac.c  |   71 +++++++++++++--------------------
 drivers/net/wireless/ath/ath11k/mac.h  |    2 
 drivers/net/wireless/ath/ath11k/reg.c  |   43 +++++++++++++------
 drivers/net/wireless/ath/ath11k/reg.h  |    2 
 drivers/net/wireless/ath/ath11k/wmi.c  |   16 ++++++-
 7 files changed, 84 insertions(+), 64 deletions(-)

--- a/drivers/net/wireless/ath/ath11k/core.c
+++ b/drivers/net/wireless/ath/ath11k/core.c
@@ -1275,6 +1275,7 @@ static void ath11k_core_restart(struct w
 
 		ieee80211_stop_queues(ar->hw);
 		ath11k_mac_drain_tx(ar);
+		complete(&ar->completed_11d_scan);
 		complete(&ar->scan.started);
 		complete(&ar->scan.completed);
 		complete(&ar->peer_assoc_done);
--- a/drivers/net/wireless/ath/ath11k/core.h
+++ b/drivers/net/wireless/ath/ath11k/core.h
@@ -38,6 +38,8 @@
 
 extern unsigned int ath11k_frame_mode;
 
+#define ATH11K_SCAN_TIMEOUT_HZ (20 * HZ)
+
 #define ATH11K_MON_TIMER_INTERVAL  10
 
 enum ath11k_supported_bw {
@@ -189,6 +191,12 @@ enum ath11k_scan_state {
 	ATH11K_SCAN_ABORTING,
 };
 
+enum ath11k_11d_state {
+	ATH11K_11D_IDLE,
+	ATH11K_11D_PREPARING,
+	ATH11K_11D_RUNNING,
+};
+
 enum ath11k_dev_flags {
 	ATH11K_CAC_RUNNING,
 	ATH11K_FLAG_CORE_REGISTERED,
@@ -599,9 +607,8 @@ struct ath11k {
 	bool dfs_block_radar_events;
 	struct ath11k_thermal thermal;
 	u32 vdev_id_11d_scan;
-	struct completion finish_11d_scan;
-	struct completion finish_11d_ch_list;
-	bool pending_11d;
+	struct completion completed_11d_scan;
+	enum ath11k_11d_state state_11d;
 	bool regdom_set_by_user;
 };
 
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -3596,26 +3596,6 @@ static int ath11k_mac_op_hw_scan(struct
 	if (ret)
 		goto exit;
 
-	/* Currently the pending_11d=true only happened 1 time while
-	 * wlan interface up in ath11k_mac_11d_scan_start(), it is called by
-	 * ath11k_mac_op_add_interface(), after wlan interface up,
-	 * pending_11d=false always.
-	 * If remove below wait, it always happened scan fail and lead connect
-	 * fail while wlan interface up, because it has a 11d scan which is running
-	 * in firmware, and lead this scan failed.
-	 */
-	if (ar->pending_11d) {
-		long time_left;
-		unsigned long timeout = 5 * HZ;
-
-		if (ar->supports_6ghz)
-			timeout += 5 * HZ;
-
-		time_left = wait_for_completion_timeout(&ar->finish_11d_ch_list, timeout);
-		ath11k_dbg(ar->ab, ATH11K_DBG_MAC,
-			   "mac wait 11d channel list time left %ld\n", time_left);
-	}
-
 	memset(&arg, 0, sizeof(arg));
 	ath11k_wmi_start_scan_init(ar, &arg);
 	arg.vdev_id = arvif->vdev_id;
@@ -3681,6 +3661,10 @@ exit:
 		kfree(arg.extraie.ptr);
 
 	mutex_unlock(&ar->conf_mutex);
+
+	if (ar->state_11d == ATH11K_11D_PREPARING)
+		ath11k_mac_11d_scan_start(ar, arvif->vdev_id);
+
 	return ret;
 }
 
@@ -5809,7 +5793,7 @@ static int ath11k_mac_op_start(struct ie
 
 	/* TODO: Do we need to enable ANI? */
 
-	ath11k_reg_update_chan_list(ar);
+	ath11k_reg_update_chan_list(ar, false);
 
 	ar->num_started_vdevs = 0;
 	ar->num_created_vdevs = 0;
@@ -5876,6 +5860,11 @@ static void ath11k_mac_op_stop(struct ie
 	cancel_work_sync(&ar->ab->update_11d_work);
 	cancel_work_sync(&ar->ab->rfkill_work);
 
+	if (ar->state_11d == ATH11K_11D_PREPARING) {
+		ar->state_11d = ATH11K_11D_IDLE;
+		complete(&ar->completed_11d_scan);
+	}
+
 	spin_lock_bh(&ar->data_lock);
 	list_for_each_entry_safe(ppdu_stats, tmp, &ar->ppdu_stats_info, list) {
 		list_del(&ppdu_stats->list);
@@ -6046,7 +6035,7 @@ static bool ath11k_mac_vif_ap_active_any
 	return false;
 }
 
-void ath11k_mac_11d_scan_start(struct ath11k *ar, u32 vdev_id, bool wait)
+void ath11k_mac_11d_scan_start(struct ath11k *ar, u32 vdev_id)
 {
 	struct wmi_11d_scan_start_params param;
 	int ret;
@@ -6074,28 +6063,22 @@ void ath11k_mac_11d_scan_start(struct at
 
 	ath11k_dbg(ar->ab, ATH11K_DBG_MAC, "mac start 11d scan\n");
 
-	if (wait)
-		reinit_completion(&ar->finish_11d_scan);
-
 	ret = ath11k_wmi_send_11d_scan_start_cmd(ar, &param);
 	if (ret) {
 		ath11k_warn(ar->ab, "failed to start 11d scan vdev %d ret: %d\n",
 			    vdev_id, ret);
 	} else {
 		ar->vdev_id_11d_scan = vdev_id;
-		if (wait) {
-			ar->pending_11d = true;
-			ret = wait_for_completion_timeout(&ar->finish_11d_scan,
-							  5 * HZ);
-			ath11k_dbg(ar->ab, ATH11K_DBG_MAC,
-				   "mac 11d scan left time %d\n", ret);
-
-			if (!ret)
-				ar->pending_11d = false;
-		}
+		if (ar->state_11d == ATH11K_11D_PREPARING)
+			ar->state_11d = ATH11K_11D_RUNNING;
 	}
 
 fin:
+	if (ar->state_11d == ATH11K_11D_PREPARING) {
+		ar->state_11d = ATH11K_11D_IDLE;
+		complete(&ar->completed_11d_scan);
+	}
+
 	mutex_unlock(&ar->ab->vdev_id_11d_lock);
 }
 
@@ -6118,12 +6101,15 @@ void ath11k_mac_11d_scan_stop(struct ath
 		vdev_id = ar->vdev_id_11d_scan;
 
 		ret = ath11k_wmi_send_11d_scan_stop_cmd(ar, vdev_id);
-		if (ret)
+		if (ret) {
 			ath11k_warn(ar->ab,
 				    "failed to stopt 11d scan vdev %d ret: %d\n",
 				    vdev_id, ret);
-		else
+		} else {
 			ar->vdev_id_11d_scan = ATH11K_11D_INVALID_VDEV_ID;
+			ar->state_11d = ATH11K_11D_IDLE;
+			complete(&ar->completed_11d_scan);
+		}
 	}
 	mutex_unlock(&ar->ab->vdev_id_11d_lock);
 }
@@ -6319,8 +6305,10 @@ static int ath11k_mac_op_add_interface(s
 			goto err_peer_del;
 		}
 
-		ath11k_mac_11d_scan_start(ar, arvif->vdev_id, true);
-
+		if (test_bit(WMI_TLV_SERVICE_11D_OFFLOAD, ab->wmi_ab.svc_map)) {
+			reinit_completion(&ar->completed_11d_scan);
+			ar->state_11d = ATH11K_11D_PREPARING;
+		}
 		break;
 	case WMI_VDEV_TYPE_MONITOR:
 		set_bit(ATH11K_FLAG_MONITOR_VDEV_CREATED, &ar->monitor_flags);
@@ -7144,7 +7132,7 @@ ath11k_mac_op_unassign_vif_chanctx(struc
 	}
 
 	if (arvif->vdev_type == WMI_VDEV_TYPE_STA)
-		ath11k_mac_11d_scan_start(ar, arvif->vdev_id, false);
+		ath11k_mac_11d_scan_start(ar, arvif->vdev_id);
 
 	mutex_unlock(&ar->conf_mutex);
 }
@@ -8625,8 +8613,7 @@ int ath11k_mac_allocate(struct ath11k_ba
 		ar->monitor_vdev_id = -1;
 		clear_bit(ATH11K_FLAG_MONITOR_VDEV_CREATED, &ar->monitor_flags);
 		ar->vdev_id_11d_scan = ATH11K_11D_INVALID_VDEV_ID;
-		init_completion(&ar->finish_11d_scan);
-		init_completion(&ar->finish_11d_ch_list);
+		init_completion(&ar->completed_11d_scan);
 	}
 
 	return 0;
--- a/drivers/net/wireless/ath/ath11k/mac.h
+++ b/drivers/net/wireless/ath/ath11k/mac.h
@@ -130,7 +130,7 @@ extern const struct htt_rx_ring_tlv_filt
 #define ATH11K_SCAN_11D_INTERVAL		600000
 #define ATH11K_11D_INVALID_VDEV_ID		0xFFFF
 
-void ath11k_mac_11d_scan_start(struct ath11k *ar, u32 vdev_id, bool wait);
+void ath11k_mac_11d_scan_start(struct ath11k *ar, u32 vdev_id);
 void ath11k_mac_11d_scan_stop(struct ath11k *ar);
 void ath11k_mac_11d_scan_stop_all(struct ath11k_base *ab);
 
--- a/drivers/net/wireless/ath/ath11k/reg.c
+++ b/drivers/net/wireless/ath/ath11k/reg.c
@@ -93,7 +93,7 @@ ath11k_reg_notifier(struct wiphy *wiphy,
 	ar->regdom_set_by_user = true;
 }
 
-int ath11k_reg_update_chan_list(struct ath11k *ar)
+int ath11k_reg_update_chan_list(struct ath11k *ar, bool wait)
 {
 	struct ieee80211_supported_band **bands;
 	struct scan_chan_list_params *params;
@@ -102,7 +102,32 @@ int ath11k_reg_update_chan_list(struct a
 	struct channel_param *ch;
 	enum nl80211_band band;
 	int num_channels = 0;
-	int i, ret;
+	int i, ret, left;
+
+	if (wait && ar->state_11d != ATH11K_11D_IDLE) {
+		left = wait_for_completion_timeout(&ar->completed_11d_scan,
+						   ATH11K_SCAN_TIMEOUT_HZ);
+		if (!left) {
+			ath11k_dbg(ar->ab, ATH11K_DBG_REG,
+				   "failed to receive 11d scan complete: timed out\n");
+			ar->state_11d = ATH11K_11D_IDLE;
+		}
+		ath11k_dbg(ar->ab, ATH11K_DBG_REG,
+			   "reg 11d scan wait left time %d\n", left);
+	}
+
+	if (wait &&
+	    (ar->scan.state == ATH11K_SCAN_STARTING ||
+	    ar->scan.state == ATH11K_SCAN_RUNNING)) {
+		left = wait_for_completion_timeout(&ar->scan.completed,
+						   ATH11K_SCAN_TIMEOUT_HZ);
+		if (!left)
+			ath11k_dbg(ar->ab, ATH11K_DBG_REG,
+				   "failed to receive hw scan complete: timed out\n");
+
+		ath11k_dbg(ar->ab, ATH11K_DBG_REG,
+			   "reg hw scan wait left time %d\n", left);
+	}
 
 	bands = hw->wiphy->bands;
 	for (band = 0; band < NUM_NL80211_BANDS; band++) {
@@ -184,11 +209,6 @@ int ath11k_reg_update_chan_list(struct a
 	ret = ath11k_wmi_send_scan_chan_list_cmd(ar, params);
 	kfree(params);
 
-	if (ar->pending_11d) {
-		complete(&ar->finish_11d_ch_list);
-		ar->pending_11d = false;
-	}
-
 	return ret;
 }
 
@@ -254,15 +274,8 @@ int ath11k_regd_update(struct ath11k *ar
 		goto err;
 	}
 
-	if (ar->pending_11d)
-		complete(&ar->finish_11d_scan);
-
 	rtnl_lock();
 	wiphy_lock(ar->hw->wiphy);
-
-	if (ar->pending_11d)
-		reinit_completion(&ar->finish_11d_ch_list);
-
 	ret = regulatory_set_wiphy_regd_sync(ar->hw->wiphy, regd_copy);
 	wiphy_unlock(ar->hw->wiphy);
 	rtnl_unlock();
@@ -273,7 +286,7 @@ int ath11k_regd_update(struct ath11k *ar
 		goto err;
 
 	if (ar->state == ATH11K_STATE_ON) {
-		ret = ath11k_reg_update_chan_list(ar);
+		ret = ath11k_reg_update_chan_list(ar, true);
 		if (ret)
 			goto err;
 	}
--- a/drivers/net/wireless/ath/ath11k/reg.h
+++ b/drivers/net/wireless/ath/ath11k/reg.h
@@ -32,5 +32,5 @@ struct ieee80211_regdomain *
 ath11k_reg_build_regd(struct ath11k_base *ab,
 		      struct cur_regulatory_info *reg_info, bool intersect);
 int ath11k_regd_update(struct ath11k *ar);
-int ath11k_reg_update_chan_list(struct ath11k *ar);
+int ath11k_reg_update_chan_list(struct ath11k *ar, bool wait);
 #endif
--- a/drivers/net/wireless/ath/ath11k/wmi.c
+++ b/drivers/net/wireless/ath/ath11k/wmi.c
@@ -2013,7 +2013,10 @@ void ath11k_wmi_start_scan_init(struct a
 {
 	/* setup commonly used values */
 	arg->scan_req_id = 1;
-	arg->scan_priority = WMI_SCAN_PRIORITY_LOW;
+	if (ar->state_11d == ATH11K_11D_PREPARING)
+		arg->scan_priority = WMI_SCAN_PRIORITY_MEDIUM;
+	else
+		arg->scan_priority = WMI_SCAN_PRIORITY_LOW;
 	arg->dwell_time_active = 50;
 	arg->dwell_time_active_2g = 0;
 	arg->dwell_time_passive = 150;
@@ -6177,8 +6180,10 @@ static void ath11k_wmi_op_ep_tx_credits(
 static int ath11k_reg_11d_new_cc_event(struct ath11k_base *ab, struct sk_buff *skb)
 {
 	const struct wmi_11d_new_cc_ev *ev;
+	struct ath11k *ar;
+	struct ath11k_pdev *pdev;
 	const void **tb;
-	int ret;
+	int ret, i;
 
 	tb = ath11k_wmi_tlv_parse_alloc(ab, skb->data, skb->len, GFP_ATOMIC);
 	if (IS_ERR(tb)) {
@@ -6204,6 +6209,13 @@ static int ath11k_reg_11d_new_cc_event(s
 
 	kfree(tb);
 
+	for (i = 0; i < ab->num_radios; i++) {
+		pdev = &ab->pdevs[i];
+		ar = pdev->ar;
+		ar->state_11d = ATH11K_11D_IDLE;
+		complete(&ar->completed_11d_scan);
+	}
+
 	queue_work(ab->workqueue, &ab->update_11d_work);
 
 	return 0;