From 49729ff616547d7abcb96924d14aa860320e7352 Mon Sep 17 00:00:00 2001 From: Marc Yang Date: Mon, 16 May 2011 19:17:50 -0700 Subject: [PATCH] mwifiex: reduce CPU usage by tracking highest_queued_prio This patch adds highest_queued_prio to track priority of packets as they are enqueued so that mwifiex_wmm_get_highest_priolist_ptr() starts checking at the first level where we have packets, instead of the highest. The function also lowers priority value to the level where first packet is found. Signed-off-by: Marc Yang Signed-off-by: Bing Zhao Signed-off-by: John W. Linville --- drivers/net/wireless/mwifiex/main.h | 2 ++ drivers/net/wireless/mwifiex/wmm.c | 29 ++++++++++++++++++++++++++--- 2 files changed, 28 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/mwifiex/main.h b/drivers/net/wireless/mwifiex/main.h index 537b40d..ea3184d 100644 --- a/drivers/net/wireless/mwifiex/main.h +++ b/drivers/net/wireless/mwifiex/main.h @@ -215,6 +215,8 @@ struct mwifiex_wmm_desc { u32 user_pri_pkt_tx_ctrl[WMM_HIGHEST_PRIORITY + 1]; /* UP: 0 to 7 */ /* Number of transmit packets queued */ atomic_t tx_pkts_queued; + /* Tracks highest priority with a packet queued */ + atomic_t highest_queued_prio; }; struct mwifiex_802_11_security { diff --git a/drivers/net/wireless/mwifiex/wmm.c b/drivers/net/wireless/mwifiex/wmm.c index 52d2185..f3d5f23 100644 --- a/drivers/net/wireless/mwifiex/wmm.c +++ b/drivers/net/wireless/mwifiex/wmm.c @@ -177,14 +177,20 @@ static void mwifiex_wmm_default_queue_priorities(struct mwifiex_private *priv) * This function map ACs to TIDs. */ static void -mwifiex_wmm_queue_priorities_tid(u8 queue_priority[]) +mwifiex_wmm_queue_priorities_tid(struct mwifiex_wmm_desc *wmm) { + u8 *queue_priority = wmm->queue_priority; int i; for (i = 0; i < 4; ++i) { tos_to_tid[7 - (i * 2)] = ac_to_tid[queue_priority[i]][1]; tos_to_tid[6 - (i * 2)] = ac_to_tid[queue_priority[i]][0]; } + + for (i = 0; i < MAX_NUM_TID; ++i) + tos_to_tid_inv[tos_to_tid[i]] = (u8)i; + + atomic_set(&wmm->highest_queued_prio, HIGH_PRIO_TID); } /* @@ -246,7 +252,7 @@ mwifiex_wmm_setup_queue_priorities(struct mwifiex_private *priv, } } - mwifiex_wmm_queue_priorities_tid(priv->wmm.queue_priority); + mwifiex_wmm_queue_priorities_tid(&priv->wmm); } /* @@ -401,6 +407,7 @@ mwifiex_wmm_init(struct mwifiex_adapter *adapter) priv->add_ba_param.rx_win_size = MWIFIEX_AMPDU_DEF_RXWINSIZE; atomic_set(&priv->wmm.tx_pkts_queued, 0); + atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID); } } @@ -468,6 +475,7 @@ static void mwifiex_wmm_cleanup_queues(struct mwifiex_private *priv) ra_list); atomic_set(&priv->wmm.tx_pkts_queued, 0); + atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID); } /* @@ -640,6 +648,11 @@ mwifiex_wmm_add_buf_txqueue(struct mwifiex_adapter *adapter, atomic_inc(&priv->wmm.tx_pkts_queued); + if (atomic_read(&priv->wmm.highest_queued_prio) < + tos_to_tid_inv[tid_down]) + atomic_set(&priv->wmm.highest_queued_prio, + tos_to_tid_inv[tid_down]); + spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags); } @@ -865,9 +878,14 @@ mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter, } do { + atomic_t *hqp; + spinlock_t *lock; + priv_tmp = bssprio_node->priv; + hqp = &priv_tmp->wmm.highest_queued_prio; + lock = &priv_tmp->wmm.ra_list_spinlock; - for (i = HIGH_PRIO_TID; i >= LOW_PRIO_TID; --i) { + for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) { tid_ptr = &(priv_tmp)->wmm. tid_tbl_ptr[tos_to_tid[i]]; @@ -905,6 +923,11 @@ mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter, is_list_empty = skb_queue_empty(&ptr->skb_head); if (!is_list_empty) { + spin_lock_irqsave(lock, flags); + if (atomic_read(hqp) > i) + atomic_set(hqp, i); + spin_unlock_irqrestore(lock, + flags); *priv = priv_tmp; *tid = tos_to_tid[i]; return ptr; -- 2.7.4