ath10k: improve channel switching

In some cases during heavy tx vdev stop-start
would timeout on vdev synchronization causing
traffic to stall for a few seconds.

Instead of stop-starting use a dedicated vdev
restart command and down vdevs explicitly before
doing so.

This gets rid of the synchronization
warnings/timeouts and makes channel switching
smoother during traffic.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 9d61bb1..b76efe2 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -796,7 +796,7 @@ static void ath10k_recalc_radar_detection(struct ath10k *ar)
        }
 }
 
-static int ath10k_vdev_start(struct ath10k_vif *arvif)
+static int ath10k_vdev_start_restart(struct ath10k_vif *arvif, bool restart)
 {
        struct ath10k *ar = arvif->ar;
        struct cfg80211_chan_def *chandef = &ar->chandef;
@@ -838,7 +838,11 @@ static int ath10k_vdev_start(struct ath10k_vif *arvif)
                   arg.vdev_id, arg.channel.freq,
                   ath10k_wmi_phymode_str(arg.channel.mode));
 
-       ret = ath10k_wmi_vdev_start(ar, &arg);
+       if (restart)
+               ret = ath10k_wmi_vdev_restart(ar, &arg);
+       else
+               ret = ath10k_wmi_vdev_start(ar, &arg);
+
        if (ret) {
                ath10k_warn("failed to start WMI vdev %i: %d\n",
                            arg.vdev_id, ret);
@@ -858,6 +862,16 @@ static int ath10k_vdev_start(struct ath10k_vif *arvif)
        return ret;
 }
 
+static int ath10k_vdev_start(struct ath10k_vif *arvif)
+{
+       return ath10k_vdev_start_restart(arvif, false);
+}
+
+static int ath10k_vdev_restart(struct ath10k_vif *arvif)
+{
+       return ath10k_vdev_start_restart(arvif, true);
+}
+
 static int ath10k_vdev_stop(struct ath10k_vif *arvif)
 {
        struct ath10k *ar = arvif->ar;
@@ -2582,18 +2596,21 @@ static void ath10k_config_chan(struct ath10k *ar)
                if (!arvif->is_started)
                        continue;
 
+               if (!arvif->is_up)
+                       continue;
+
                if (arvif->vdev_type == WMI_VDEV_TYPE_MONITOR)
                        continue;
 
-               ret = ath10k_vdev_stop(arvif);
+               ret = ath10k_wmi_vdev_down(ar, arvif->vdev_id);
                if (ret) {
-                       ath10k_warn("failed to stop vdev %d: %d\n",
+                       ath10k_warn("failed to down vdev %d: %d\n",
                                    arvif->vdev_id, ret);
                        continue;
                }
        }
 
-       /* all vdevs are now stopped - now attempt to restart them */
+       /* all vdevs are downed now - attempt to restart and re-up them */
 
        list_for_each_entry(arvif, &ar->arvifs, list) {
                if (!arvif->is_started)
@@ -2602,9 +2619,9 @@ static void ath10k_config_chan(struct ath10k *ar)
                if (arvif->vdev_type == WMI_VDEV_TYPE_MONITOR)
                        continue;
 
-               ret = ath10k_vdev_start(arvif);
+               ret = ath10k_vdev_restart(arvif);
                if (ret) {
-                       ath10k_warn("failed to start vdev %d: %d\n",
+                       ath10k_warn("failed to restart vdev %d: %d\n",
                                    arvif->vdev_id, ret);
                        continue;
                }