ath10k: improve beacon submission latency

The patch prevents beacon misses in some case of
heavy load on a system.

If a beacon can't be transmitted directly from an
SWBA event it will be left in arvif->beacon and
transmission will be retried once TX credits
become available.

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/core.h b/drivers/net/wireless/ath/ath10k/core.h
index c953a33..14b7d3d 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/core.h
+++ b/drivers/net/wireless/ath/ath10k/core.h
@@ -204,6 +204,7 @@ struct ath10k_vif {
        enum wmi_vdev_subtype vdev_subtype;
        u32 beacon_interval;
        u32 dtim_period;
+       struct sk_buff *beacon;
 
        struct ath10k *ar;
        struct ieee80211_vif *vif;

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 8b9fb66..6c3e9d1 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -2075,6 +2075,13 @@ static void ath10k_remove_interface(struct ieee80211_hw *hw,
 
        mutex_lock(&ar->conf_mutex);
 
+       spin_lock_bh(&ar->data_lock);
+       if (arvif->beacon) {
+               dev_kfree_skb_any(arvif->beacon);
+               arvif->beacon = NULL;
+       }
+       spin_unlock_bh(&ar->data_lock);
+
        ar->free_vdev_map |= 1 << (arvif->vdev_id);
 
        if (arvif->vdev_type == WMI_VDEV_TYPE_AP) {

diff --git a/drivers/net/wireless/ath/ath10k/wmi.c b/drivers/net/wireless/ath/ath10k/wmi.c
index ff407c2..9152dae 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/wmi.c
+++ b/drivers/net/wireless/ath/ath10k/wmi.c
@@ -120,8 +120,53 @@ err_pull:
        return ret;
 }
 
+static void ath10k_wmi_tx_beacon_nowait(struct ath10k_vif *arvif)
+{
+       struct wmi_bcn_tx_arg arg = {0};
+       int ret;
+
+       lockdep_assert_held(&arvif->ar->data_lock);
+
+       if (arvif->beacon == NULL)
+               return;
+
+       arg.vdev_id = arvif->vdev_id;
+       arg.tx_rate = 0;
+       arg.tx_power = 0;
+       arg.bcn = arvif->beacon->data;
+       arg.bcn_len = arvif->beacon->len;
+
+       ret = ath10k_wmi_beacon_send_nowait(arvif->ar, &arg);
+       if (ret)
+               return;
+
+       dev_kfree_skb_any(arvif->beacon);
+       arvif->beacon = NULL;
+}
+
+static void ath10k_wmi_tx_beacons_iter(void *data, u8 *mac,
+                                      struct ieee80211_vif *vif)
+{
+       struct ath10k_vif *arvif = ath10k_vif_to_arvif(vif);
+
+       ath10k_wmi_tx_beacon_nowait(arvif);
+}
+
+static void ath10k_wmi_tx_beacons_nowait(struct ath10k *ar)
+{
+       spin_lock_bh(&ar->data_lock);
+       ieee80211_iterate_active_interfaces_atomic(ar->hw,
+                                                  IEEE80211_IFACE_ITER_NORMAL,
+                                                  ath10k_wmi_tx_beacons_iter,
+                                                  NULL);
+       spin_unlock_bh(&ar->data_lock);
+}
+
 static void ath10k_wmi_op_ep_tx_credits(struct ath10k *ar)
 {
+       /* try to send pending beacons first. they take priority */
+       ath10k_wmi_tx_beacons_nowait(ar);
+
        wake_up(&ar->wmi.tx_credits_wq);
 }
 
@@ -131,6 +176,9 @@ static int ath10k_wmi_cmd_send(struct ath10k *ar, struct sk_buff *skb,
        int ret = -EINVAL;
 
        wait_event_timeout(ar->wmi.tx_credits_wq, ({
+               /* try to send pending beacons first. they take priority */
+               ath10k_wmi_tx_beacons_nowait(ar);
+
                ret = ath10k_wmi_cmd_send_nowait(ar, skb, cmd_id);
                (ret != -EAGAIN);
        }), 3*HZ);
@@ -760,10 +808,8 @@ static void ath10k_wmi_event_host_swba(struct ath10k *ar, struct sk_buff *skb)
        int i = -1;
        struct wmi_bcn_info *bcn_info;
        struct ath10k_vif *arvif;
-       struct wmi_bcn_tx_arg arg;
        struct sk_buff *bcn;
        int vdev_id = 0;
-       int ret;
 
        ath10k_dbg(ATH10K_DBG_MGMT, "WMI_HOST_SWBA_EVENTID\n");
 
@@ -820,17 +866,17 @@ static void ath10k_wmi_event_host_swba(struct ath10k *ar, struct sk_buff *skb)
                ath10k_wmi_update_tim(ar, arvif, bcn, bcn_info);
                ath10k_wmi_update_noa(ar, arvif, bcn, bcn_info);
 
-               arg.vdev_id = arvif->vdev_id;
-               arg.tx_rate = 0;
-               arg.tx_power = 0;
-               arg.bcn = bcn->data;
-               arg.bcn_len = bcn->len;
+               spin_lock_bh(&ar->data_lock);
+               if (arvif->beacon) {
+                       ath10k_warn("SWBA overrun on vdev %d\n",
+                                   arvif->vdev_id);
+                       dev_kfree_skb_any(arvif->beacon);
+               }
 
-               ret = ath10k_wmi_beacon_send(ar, &arg);
-               if (ret)
-                       ath10k_warn("could not send beacon (%d)\n", ret);
+               arvif->beacon = bcn;
 
-               dev_kfree_skb_any(bcn);
+               ath10k_wmi_tx_beacon_nowait(arvif);
+               spin_unlock_bh(&ar->data_lock);
        }
 }
 
@@ -1181,6 +1227,7 @@ static void ath10k_wmi_process_rx(struct ath10k *ar, struct sk_buff *skb)
         * thus can't be defered to a worker thread */
        switch (event_id) {
        case WMI_MGMT_RX_EVENTID:
+       case WMI_HOST_SWBA_EVENTID:
                ath10k_wmi_event_process(ar, skb);
                return;
        default:
@@ -2138,7 +2185,8 @@ int ath10k_wmi_peer_assoc(struct ath10k *ar,
        return ath10k_wmi_cmd_send(ar, skb, WMI_PEER_ASSOC_CMDID);
 }
 
-int ath10k_wmi_beacon_send(struct ath10k *ar, const struct wmi_bcn_tx_arg *arg)
+int ath10k_wmi_beacon_send_nowait(struct ath10k *ar,
+                                 const struct wmi_bcn_tx_arg *arg)
 {
        struct wmi_bcn_tx_cmd *cmd;
        struct sk_buff *skb;
@@ -2154,7 +2202,7 @@ int ath10k_wmi_beacon_send(struct ath10k *ar, const struct wmi_bcn_tx_arg *arg)
        cmd->hdr.bcn_len  = __cpu_to_le32(arg->bcn_len);
        memcpy(cmd->bcn, arg->bcn, arg->bcn_len);
 
-       return ath10k_wmi_cmd_send(ar, skb, WMI_BCN_TX_CMDID);
+       return ath10k_wmi_cmd_send_nowait(ar, skb, WMI_BCN_TX_CMDID);
 }
 
 static void ath10k_wmi_pdev_set_wmm_param(struct wmi_wmm_params *params,

diff --git a/drivers/net/wireless/ath/ath10k/wmi.h b/drivers/net/wireless/ath/ath10k/wmi.h
index ab46582..b100431 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/wmi.h
+++ b/drivers/net/wireless/ath/ath10k/wmi.h
@@ -3110,7 +3110,8 @@ int ath10k_wmi_set_ap_ps_param(struct ath10k *ar, u32 vdev_id, const u8 *mac,
                               enum wmi_ap_ps_peer_param param_id, u32 value);
 int ath10k_wmi_scan_chan_list(struct ath10k *ar,
                              const struct wmi_scan_chan_list_arg *arg);
-int ath10k_wmi_beacon_send(struct ath10k *ar, const struct wmi_bcn_tx_arg *arg);
+int ath10k_wmi_beacon_send_nowait(struct ath10k *ar,
+                                 const struct wmi_bcn_tx_arg *arg);
 int ath10k_wmi_pdev_set_wmm_params(struct ath10k *ar,
                        const struct wmi_pdev_set_wmm_params_arg *arg);
 int ath10k_wmi_request_stats(struct ath10k *ar, enum wmi_stats_id stats_id);