ath11k: reduce the wait time of 11d scan and hw scan while add interface

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")
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

1 files changed, 29 insertions, 42 deletions

diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index 9caa8b87c313..175a4ae752f3 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -3621,26 +3621,6 @@ static int ath11k_mac_op_hw_scan(struct ieee80211_hw *hw,
 	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;
@@ -3706,6 +3686,10 @@ 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;
 }
 
@@ -5859,7 +5843,7 @@ static int ath11k_mac_op_start(struct ieee80211_hw *hw)
 
 	/* 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;
@@ -5926,6 +5910,11 @@ static void ath11k_mac_op_stop(struct ieee80211_hw *hw)
 	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);
@@ -6096,7 +6085,7 @@ static bool ath11k_mac_vif_ap_active_any(struct ath11k_base *ab)
 	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;
@@ -6124,28 +6113,22 @@ void ath11k_mac_11d_scan_start(struct ath11k *ar, u32 vdev_id, bool wait)
 
 	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);
 }
 
@@ -6168,12 +6151,15 @@ void ath11k_mac_11d_scan_stop(struct ath11k *ar)
 		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);
 }
@@ -6369,8 +6355,10 @@ static int ath11k_mac_op_add_interface(struct ieee80211_hw *hw,
 			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);
@@ -7230,7 +7218,7 @@ ath11k_mac_op_unassign_vif_chanctx(struct ieee80211_hw *hw,
 	}
 
 	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);
 }
@@ -8920,8 +8908,7 @@ int ath11k_mac_allocate(struct ath11k_base *ab)
 		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;