From 61c873045f74b16317c88e2931637329a6844564 Mon Sep 17 00:00:00 2001 From: Avinash Patil Date: Mon, 22 Jul 2013 19:17:41 -0700 Subject: [PATCH] mwifiex: delete AP TX queues when bridged packets reach threshold Delete packets from TX queues for this mwifiex_private structure when bridged packet count reaches maximum threshold. Bridged packets from each RA List are deleted till they fall to low threshold of 128. Signed-off-by: Avinash Patil Signed-off-by: Bing Zhao Signed-off-by: John W. Linville --- drivers/net/wireless/mwifiex/decl.h | 3 +- drivers/net/wireless/mwifiex/init.c | 1 + drivers/net/wireless/mwifiex/main.h | 1 + drivers/net/wireless/mwifiex/uap_txrx.c | 66 ++++++++++++++++++++++++++++++++- 4 files changed, 69 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/mwifiex/decl.h b/drivers/net/wireless/mwifiex/decl.h index 94cc09d..a599347 100644 --- a/drivers/net/wireless/mwifiex/decl.h +++ b/drivers/net/wireless/mwifiex/decl.h @@ -75,7 +75,8 @@ #define MWIFIEX_BUF_FLAG_REQUEUED_PKT BIT(0) #define MWIFIEX_BUF_FLAG_BRIDGED_PKT BIT(1) -#define MWIFIEX_BRIDGED_PKTS_THRESHOLD 1024 +#define MWIFIEX_BRIDGED_PKTS_THR_HIGH 1024 +#define MWIFIEX_BRIDGED_PKTS_THR_LOW 128 enum mwifiex_bss_type { MWIFIEX_BSS_TYPE_STA = 0, diff --git a/drivers/net/wireless/mwifiex/init.c b/drivers/net/wireless/mwifiex/init.c index caaf4bd..fb86cec1 100644 --- a/drivers/net/wireless/mwifiex/init.c +++ b/drivers/net/wireless/mwifiex/init.c @@ -135,6 +135,7 @@ int mwifiex_init_priv(struct mwifiex_private *priv) priv->csa_chan = 0; priv->csa_expire_time = 0; + priv->del_list_idx = 0; return mwifiex_add_bss_prio_tbl(priv); } diff --git a/drivers/net/wireless/mwifiex/main.h b/drivers/net/wireless/mwifiex/main.h index 761e592..5db0543 100644 --- a/drivers/net/wireless/mwifiex/main.h +++ b/drivers/net/wireless/mwifiex/main.h @@ -515,6 +515,7 @@ struct mwifiex_private { bool scan_aborting; u8 csa_chan; unsigned long csa_expire_time; + u8 del_list_idx; }; enum mwifiex_ba_status { diff --git a/drivers/net/wireless/mwifiex/uap_txrx.c b/drivers/net/wireless/mwifiex/uap_txrx.c index 11df2b2..1cfe5a7 100644 --- a/drivers/net/wireless/mwifiex/uap_txrx.c +++ b/drivers/net/wireless/mwifiex/uap_txrx.c @@ -24,6 +24,69 @@ #include "11n_aggr.h" #include "11n_rxreorder.h" +/* This function checks if particular RA list has packets more than low bridge + * packet threshold and then deletes packet from this RA list. + * Function deletes packets from such RA list and returns true. If no such list + * is found, false is returned. + */ +static bool +mwifiex_uap_del_tx_pkts_in_ralist(struct mwifiex_private *priv, + struct list_head *ra_list_head) +{ + struct mwifiex_ra_list_tbl *ra_list; + struct sk_buff *skb, *tmp; + bool pkt_deleted = false; + struct mwifiex_txinfo *tx_info; + struct mwifiex_adapter *adapter = priv->adapter; + + list_for_each_entry(ra_list, ra_list_head, list) { + if (skb_queue_empty(&ra_list->skb_head)) + continue; + + skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) { + tx_info = MWIFIEX_SKB_TXCB(skb); + if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT) { + __skb_unlink(skb, &ra_list->skb_head); + mwifiex_write_data_complete(adapter, skb, 0, + -1); + atomic_dec(&priv->wmm.tx_pkts_queued); + pkt_deleted = true; + } + if ((atomic_read(&adapter->pending_bridged_pkts) <= + MWIFIEX_BRIDGED_PKTS_THR_LOW)) + break; + } + } + + return pkt_deleted; +} + +/* This function deletes packets from particular RA List. RA list index + * from which packets are deleted is preserved so that packets from next RA + * list are deleted upon subsequent call thus maintaining fairness. + */ +static void mwifiex_uap_cleanup_tx_queues(struct mwifiex_private *priv) +{ + unsigned long flags; + struct list_head *ra_list; + int i; + + spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags); + + for (i = 0; i < MAX_NUM_TID; i++, priv->del_list_idx++) { + if (priv->del_list_idx == MAX_NUM_TID) + priv->del_list_idx = 0; + ra_list = &priv->wmm.tid_tbl_ptr[priv->del_list_idx].ra_list; + if (mwifiex_uap_del_tx_pkts_in_ralist(priv, ra_list)) { + priv->del_list_idx++; + break; + } + } + + spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags); +} + + static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv, struct sk_buff *skb) { @@ -40,10 +103,11 @@ static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv, rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); if ((atomic_read(&adapter->pending_bridged_pkts) >= - MWIFIEX_BRIDGED_PKTS_THRESHOLD)) { + MWIFIEX_BRIDGED_PKTS_THR_HIGH)) { dev_err(priv->adapter->dev, "Tx: Bridge packet limit reached. Drop packet!\n"); kfree_skb(skb); + mwifiex_uap_cleanup_tx_queues(priv); return; } -- 2.7.4