[PATCH 5/7] ath10k: improve beacon submission latency
Michal Kazior
michal.kazior at tieto.com
Tue Sep 10 09:50:01 EDT 2013
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 at tieto.com>
---
drivers/net/wireless/ath/ath10k/core.h | 1 +
drivers/net/wireless/ath/ath10k/mac.c | 7 ++++
drivers/net/wireless/ath/ath10k/wmi.c | 70 ++++++++++++++++++++++++++------
drivers/net/wireless/ath/ath10k/wmi.h | 3 +-
4 files changed, 67 insertions(+), 14 deletions(-)
diff --git a/drivers/net/wireless/ath/ath10k/core.h b/drivers/net/wireless/ath/ath10k/core.h
index c953a33..14b7d3d 100644
--- 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 248248b..439d0c3 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -2056,6 +2056,13 @@ static void ath10k_remove_interface(struct ieee80211_hw *hw,
ath10k_dbg(ATH10K_DBG_MAC, "Remove interface: id %d\n", arvif->vdev_id);
+ 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..c13e434 100644
--- a/drivers/net/wireless/ath/ath10k/wmi.c
+++ b/drivers/net/wireless/ath/ath10k/wmi.c
@@ -120,8 +120,51 @@ 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)
{
+ ath10k_wmi_tx_beacons_nowait(ar);
wake_up(&ar->wmi.tx_credits_wq);
}
@@ -131,6 +174,7 @@ static int ath10k_wmi_cmd_send(struct ath10k *ar, struct sk_buff *skb,
int ret = -EINVAL;
wait_event_timeout(ar->wmi.tx_credits_wq, ({
+ ath10k_wmi_tx_beacons_nowait(ar);
ret = ath10k_wmi_cmd_send_nowait(ar, skb, cmd_id);
(ret != -EAGAIN);
}), 3*HZ);
@@ -760,10 +804,8 @@ 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 +862,17 @@ 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 +1223,7 @@ 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 +2181,8 @@ 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 +2198,7 @@ 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 40fcf05..482461a 100644
--- a/drivers/net/wireless/ath/ath10k/wmi.h
+++ b/drivers/net/wireless/ath/ath10k/wmi.h
@@ -3068,7 +3068,8 @@ 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);
--
1.7.9.5
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