From caf1eae206688210f61f3b48627ce4ca3c709784 Mon Sep 17 00:00:00 2001 From: Christian Lamparter Date: Sun, 24 Apr 2011 17:44:19 +0200 Subject: [PATCH] carl9170: improve unicast PS buffering Using the ieee80211_sta_block allows the PS code to handle awake->doze->awake transitions of our clients in a race-free manner. Signed-off-by: Christian Lamparter Signed-off-by: John W. Linville --- drivers/net/wireless/ath/carl9170/carl9170.h | 2 + drivers/net/wireless/ath/carl9170/main.c | 92 +---------- drivers/net/wireless/ath/carl9170/tx.c | 157 ++++++++++++------- 3 files changed, 112 insertions(+), 139 deletions(-) diff --git a/drivers/net/wireless/ath/carl9170/carl9170.h b/drivers/net/wireless/ath/carl9170/carl9170.h index 9cad061cc1d2..beb725d7547f 100644 --- a/drivers/net/wireless/ath/carl9170/carl9170.h +++ b/drivers/net/wireless/ath/carl9170/carl9170.h @@ -448,6 +448,8 @@ struct carl9170_ba_stats { struct carl9170_sta_info { bool ht_sta; + bool sleeping; + atomic_t pending_frames; unsigned int ampdu_max_len; struct carl9170_sta_tid *agg[CARL9170_NUM_TID]; struct carl9170_ba_stats stats[CARL9170_NUM_TID]; diff --git a/drivers/net/wireless/ath/carl9170/main.c b/drivers/net/wireless/ath/carl9170/main.c index 89fe60accf85..1638468be5a3 100644 --- a/drivers/net/wireless/ath/carl9170/main.c +++ b/drivers/net/wireless/ath/carl9170/main.c @@ -1193,6 +1193,8 @@ static int carl9170_op_sta_add(struct ieee80211_hw *hw, struct carl9170_sta_info *sta_info = (void *) sta->drv_priv; unsigned int i; + atomic_set(&sta_info->pending_frames, 0); + if (sta->ht_cap.ht_supported) { if (sta->ht_cap.ampdu_density > 6) { /* @@ -1467,99 +1469,17 @@ static void carl9170_op_sta_notify(struct ieee80211_hw *hw, enum sta_notify_cmd cmd, struct ieee80211_sta *sta) { - struct ar9170 *ar = hw->priv; struct carl9170_sta_info *sta_info = (void *) sta->drv_priv; - struct sk_buff *skb, *tmp; - struct sk_buff_head free; - int i; switch (cmd) { case STA_NOTIFY_SLEEP: - /* - * Since the peer is no longer listening, we have to return - * as many SKBs as possible back to the mac80211 stack. - * It will deal with the retry procedure, once the peer - * has become available again. - * - * NB: Ideally, the driver should return the all frames in - * the correct, ascending order. However, I think that this - * functionality should be implemented in the stack and not - * here... - */ - - __skb_queue_head_init(&free); - - if (sta->ht_cap.ht_supported) { - rcu_read_lock(); - for (i = 0; i < CARL9170_NUM_TID; i++) { - struct carl9170_sta_tid *tid_info; - - tid_info = rcu_dereference(sta_info->agg[i]); - - if (!tid_info) - continue; - - spin_lock_bh(&ar->tx_ampdu_list_lock); - if (tid_info->state > - CARL9170_TID_STATE_SUSPEND) - tid_info->state = - CARL9170_TID_STATE_SUSPEND; - spin_unlock_bh(&ar->tx_ampdu_list_lock); - - spin_lock_bh(&tid_info->lock); - while ((skb = __skb_dequeue(&tid_info->queue))) - __skb_queue_tail(&free, skb); - spin_unlock_bh(&tid_info->lock); - } - rcu_read_unlock(); - } - - for (i = 0; i < ar->hw->queues; i++) { - spin_lock_bh(&ar->tx_pending[i].lock); - skb_queue_walk_safe(&ar->tx_pending[i], skb, tmp) { - struct _carl9170_tx_superframe *super; - struct ieee80211_hdr *hdr; - struct ieee80211_tx_info *info; - - super = (void *) skb->data; - hdr = (void *) super->frame_data; - - if (compare_ether_addr(hdr->addr1, sta->addr)) - continue; - - __skb_unlink(skb, &ar->tx_pending[i]); - - info = IEEE80211_SKB_CB(skb); - if (info->flags & IEEE80211_TX_CTL_AMPDU) - atomic_dec(&ar->tx_ampdu_upload); - - carl9170_tx_status(ar, skb, false); - } - spin_unlock_bh(&ar->tx_pending[i].lock); - } - - while ((skb = __skb_dequeue(&free))) - carl9170_tx_status(ar, skb, false); - + sta_info->sleeping = true; + if (atomic_read(&sta_info->pending_frames)) + ieee80211_sta_block_awake(hw, sta, true); break; case STA_NOTIFY_AWAKE: - if (!sta->ht_cap.ht_supported) - return; - - rcu_read_lock(); - for (i = 0; i < CARL9170_NUM_TID; i++) { - struct carl9170_sta_tid *tid_info; - - tid_info = rcu_dereference(sta_info->agg[i]); - - if (!tid_info) - continue; - - if ((tid_info->state == CARL9170_TID_STATE_SUSPEND)) - tid_info->state = CARL9170_TID_STATE_IDLE; - } - rcu_read_unlock(); + sta_info->sleeping = false; break; } } diff --git a/drivers/net/wireless/ath/carl9170/tx.c b/drivers/net/wireless/ath/carl9170/tx.c index cb70ed7ec5cc..bf2eff9dd582 100644 --- a/drivers/net/wireless/ath/carl9170/tx.c +++ b/drivers/net/wireless/ath/carl9170/tx.c @@ -104,6 +104,56 @@ static void carl9170_tx_accounting(struct ar9170 *ar, struct sk_buff *skb) spin_unlock_bh(&ar->tx_stats_lock); } +/* needs rcu_read_lock */ +static struct ieee80211_sta *__carl9170_get_tx_sta(struct ar9170 *ar, + struct sk_buff *skb) +{ + struct _carl9170_tx_superframe *super = (void *) skb->data; + struct ieee80211_hdr *hdr = (void *) super->frame_data; + struct ieee80211_vif *vif; + unsigned int vif_id; + + vif_id = (super->s.misc & CARL9170_TX_SUPER_MISC_VIF_ID) >> + CARL9170_TX_SUPER_MISC_VIF_ID_S; + + if (WARN_ON_ONCE(vif_id >= AR9170_MAX_VIRTUAL_MAC)) + return NULL; + + vif = rcu_dereference(ar->vif_priv[vif_id].vif); + if (unlikely(!vif)) + return NULL; + + /* + * Normally we should use wrappers like ieee80211_get_DA to get + * the correct peer ieee80211_sta. + * + * But there is a problem with indirect traffic (broadcasts, or + * data which is designated for other stations) in station mode. + * The frame will be directed to the AP for distribution and not + * to the actual destination. + */ + + return ieee80211_find_sta(vif, hdr->addr1); +} + +static void carl9170_tx_ps_unblock(struct ar9170 *ar, struct sk_buff *skb) +{ + struct ieee80211_sta *sta; + struct carl9170_sta_info *sta_info; + + rcu_read_lock(); + sta = __carl9170_get_tx_sta(ar, skb); + if (unlikely(!sta)) + goto out_rcu; + + sta_info = (struct carl9170_sta_info *) sta->drv_priv; + if (atomic_dec_return(&sta_info->pending_frames) == 0) + ieee80211_sta_block_awake(ar->hw, sta, false); + +out_rcu: + rcu_read_unlock(); +} + static void carl9170_tx_accounting_free(struct ar9170 *ar, struct sk_buff *skb) { struct ieee80211_tx_info *txinfo; @@ -135,6 +185,7 @@ static void carl9170_tx_accounting_free(struct ar9170 *ar, struct sk_buff *skb) } spin_unlock_bh(&ar->tx_stats_lock); + if (atomic_dec_and_test(&ar->tx_total_queued)) complete(&ar->tx_flush); } @@ -329,13 +380,10 @@ static void carl9170_tx_status_process_ampdu(struct ar9170 *ar, { struct _carl9170_tx_superframe *super = (void *) skb->data; struct ieee80211_hdr *hdr = (void *) super->frame_data; - struct ieee80211_tx_info *tx_info; struct carl9170_tx_info *ar_info; - struct carl9170_sta_info *sta_info; struct ieee80211_sta *sta; + struct carl9170_sta_info *sta_info; struct carl9170_sta_tid *tid_info; - struct ieee80211_vif *vif; - unsigned int vif_id; u8 tid; if (!(txinfo->flags & IEEE80211_TX_CTL_AMPDU) || @@ -343,30 +391,10 @@ static void carl9170_tx_status_process_ampdu(struct ar9170 *ar, (!(super->f.mac_control & cpu_to_le16(AR9170_TX_MAC_AGGR)))) return; - tx_info = IEEE80211_SKB_CB(skb); - ar_info = (void *) tx_info->rate_driver_data; - - vif_id = (super->s.misc & CARL9170_TX_SUPER_MISC_VIF_ID) >> - CARL9170_TX_SUPER_MISC_VIF_ID_S; - - if (WARN_ON_ONCE(vif_id >= AR9170_MAX_VIRTUAL_MAC)) - return; + ar_info = (void *) txinfo->rate_driver_data; rcu_read_lock(); - vif = rcu_dereference(ar->vif_priv[vif_id].vif); - if (unlikely(!vif)) - goto out_rcu; - - /* - * Normally we should use wrappers like ieee80211_get_DA to get - * the correct peer ieee80211_sta. - * - * But there is a problem with indirect traffic (broadcasts, or - * data which is designated for other stations) in station mode. - * The frame will be directed to the AP for distribution and not - * to the actual destination. - */ - sta = ieee80211_find_sta(vif, hdr->addr1); + sta = __carl9170_get_tx_sta(ar, skb); if (unlikely(!sta)) goto out_rcu; @@ -427,6 +455,7 @@ void carl9170_tx_status(struct ar9170 *ar, struct sk_buff *skb, if (txinfo->flags & IEEE80211_TX_CTL_AMPDU) carl9170_tx_status_process_ampdu(ar, skb, txinfo); + carl9170_tx_ps_unblock(ar, skb); carl9170_tx_put_skb(skb); } @@ -540,11 +569,7 @@ static void carl9170_tx_ampdu_timeout(struct ar9170 *ar) struct sk_buff *skb; struct ieee80211_tx_info *txinfo; struct carl9170_tx_info *arinfo; - struct _carl9170_tx_superframe *super; struct ieee80211_sta *sta; - struct ieee80211_vif *vif; - struct ieee80211_hdr *hdr; - unsigned int vif_id; rcu_read_lock(); list_for_each_entry_rcu(iter, &ar->tx_ampdu_list, list) { @@ -562,20 +587,7 @@ static void carl9170_tx_ampdu_timeout(struct ar9170 *ar) msecs_to_jiffies(CARL9170_QUEUE_TIMEOUT))) goto unlock; - super = (void *) skb->data; - hdr = (void *) super->frame_data; - - vif_id = (super->s.misc & CARL9170_TX_SUPER_MISC_VIF_ID) >> - CARL9170_TX_SUPER_MISC_VIF_ID_S; - - if (WARN_ON(vif_id >= AR9170_MAX_VIRTUAL_MAC)) - goto unlock; - - vif = rcu_dereference(ar->vif_priv[vif_id].vif); - if (WARN_ON(!vif)) - goto unlock; - - sta = ieee80211_find_sta(vif, hdr->addr1); + sta = __carl9170_get_tx_sta(ar, skb); if (WARN_ON(!sta)) goto unlock; @@ -1199,15 +1211,6 @@ static struct sk_buff *carl9170_tx_pick_skb(struct ar9170 *ar, arinfo = (void *) info->rate_driver_data; arinfo->timeout = jiffies; - - /* - * increase ref count to "2". - * Ref counting is the easiest way to solve the race between - * the the urb's completion routine: carl9170_tx_callback and - * wlan tx status functions: carl9170_tx_status/janitor. - */ - carl9170_tx_get_skb(skb); - return skb; err_unlock: @@ -1228,6 +1231,36 @@ void carl9170_tx_drop(struct ar9170 *ar, struct sk_buff *skb) __carl9170_tx_process_status(ar, super->s.cookie, q); } +static bool carl9170_tx_ps_drop(struct ar9170 *ar, struct sk_buff *skb) +{ + struct ieee80211_sta *sta; + struct carl9170_sta_info *sta_info; + + rcu_read_lock(); + sta = __carl9170_get_tx_sta(ar, skb); + if (!sta) + goto out_rcu; + + sta_info = (void *) sta->drv_priv; + if (unlikely(sta_info->sleeping)) { + struct ieee80211_tx_info *tx_info; + + rcu_read_unlock(); + + tx_info = IEEE80211_SKB_CB(skb); + if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) + atomic_dec(&ar->tx_ampdu_upload); + + tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED; + carl9170_tx_status(ar, skb, false); + return true; + } + +out_rcu: + rcu_read_unlock(); + return false; +} + static void carl9170_tx(struct ar9170 *ar) { struct sk_buff *skb; @@ -1247,6 +1280,9 @@ static void carl9170_tx(struct ar9170 *ar) if (unlikely(!skb)) break; + if (unlikely(carl9170_tx_ps_drop(ar, skb))) + continue; + atomic_inc(&ar->tx_total_pending); q = __carl9170_get_queue(ar, i); @@ -1256,6 +1292,16 @@ static void carl9170_tx(struct ar9170 *ar) */ skb_queue_tail(&ar->tx_status[q], skb); + /* + * increase ref count to "2". + * Ref counting is the easiest way to solve the + * race between the urb's completion routine: + * carl9170_tx_callback + * and wlan tx status functions: + * carl9170_tx_status/janitor. + */ + carl9170_tx_get_skb(skb); + carl9170_usb_tx(ar, skb); schedule_garbagecollector = true; } @@ -1368,6 +1414,11 @@ void carl9170_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb) * all ressouces which are associated with the frame. */ + if (sta) { + struct carl9170_sta_info *stai = (void *) sta->drv_priv; + atomic_inc(&stai->pending_frames); + } + if (info->flags & IEEE80211_TX_CTL_AMPDU) { run = carl9170_tx_ampdu_queue(ar, sta, skb); if (run) -- 2.30.2