mwifiex: add multi-queue support

This patch adds support for multiple TX queues inside mwifiex
driver. Four different queues according to WMM access categories
are defined for each virtual interface. When a packet is
received from netdev for transmission, tx pending count for
particular queue is incremented and if tx pending count has
reached upper water-mark, this queue is stopped instead of
stopping all queues. Similarly when a packet is successfully
transmitted from device, tx pending count is decremented per
queue and if pending count falls below lower water-mark, queue
operations are again resumed. This ensures that not all
tranmission is blocked if traffic with particular TOS value
suddenly increases.

Also wake all queues after association/IBSS_join/uAP_BSS_start
to enable traffic on all queues.

Signed-off-by: Avinash Patil <patila@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 18 insertions, 2 deletions

diff --git a/drivers/net/wireless/mwifiex/init.c b/drivers/net/wireless/mwifiex/init.c
index 482faace7900..39f03ce5a5b1 100644
--- a/drivers/net/wireless/mwifiex/init.c
+++ b/drivers/net/wireless/mwifiex/init.c
@@ -388,9 +388,17 @@ void mwifiex_wake_up_net_dev_queue(struct net_device *netdev,
                                         struct mwifiex_adapter *adapter)
 {
         unsigned long dev_queue_flags;
+        unsigned int i;
 
         spin_lock_irqsave(&adapter->queue_lock, dev_queue_flags);
-        netif_tx_wake_all_queues(netdev);
+
+        for (i = 0; i < netdev->num_tx_queues; i++) {
+                struct netdev_queue *txq = netdev_get_tx_queue(netdev, i);
+
+                if (netif_tx_queue_stopped(txq))
+                        netif_tx_wake_queue(txq);
+        }
+
         spin_unlock_irqrestore(&adapter->queue_lock, dev_queue_flags);
 }
 
@@ -401,9 +409,17 @@ void mwifiex_stop_net_dev_queue(struct net_device *netdev,
                                         struct mwifiex_adapter *adapter)
 {
         unsigned long dev_queue_flags;
+        unsigned int i;
 
         spin_lock_irqsave(&adapter->queue_lock, dev_queue_flags);
-        netif_tx_stop_all_queues(netdev);
+
+        for (i = 0; i < netdev->num_tx_queues; i++) {
+                struct netdev_queue *txq = netdev_get_tx_queue(netdev, i);
+
+                if (!netif_tx_queue_stopped(txq))
+                        netif_tx_stop_queue(txq);
+        }
+
         spin_unlock_irqrestore(&adapter->queue_lock, dev_queue_flags);
 }