From ed54388a38d817dce7fe22e7dc80fc13b1a6838e Mon Sep 17 00:00:00 2001 From: Michal Kazior Date: Fri, 13 Sep 2013 14:16:56 +0200 Subject: [PATCH] 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 Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/ath10k/core.h | 1 + drivers/net/wireless/ath/ath10k/mac.c | 7 +++ drivers/net/wireless/ath/ath10k/wmi.c | 74 +++++++++++++++++++++----- drivers/net/wireless/ath/ath10k/wmi.h | 3 +- 4 files changed, 71 insertions(+), 14 deletions(-) diff --git a/drivers/net/wireless/ath/ath10k/core.h b/drivers/net/wireless/ath/ath10k/core.h index c953a3317d7b..14b7d3de6883 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 8b9fb660519b..6c3e9d1f80d9 100644 --- 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 ff407c2f1d2b..9152daea9d96 100644 --- 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 ab46582d4eaa..b100431f2241 100644 --- 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); -- 2.39.5