mwl8k: move receive processing to tasklet

Like how TX reclaim is done in a tasklet, move receive processing
to tasklet context as well.  This can have nice benefits for CPU
utilisation and throughput, especially at 3-stream rates.

(Use the same CLEAR_SEL trick as the TX reclaim tasklet does, to
avoid having to touch the interrupt mask registers.)

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 37 insertions, 10 deletions

diff --git a/drivers/net/wireless/mwl8k.c b/drivers/net/wireless/mwl8k.c
index 3f55aa0c8db3..13b0e32b051a 100644
--- a/drivers/net/wireless/mwl8k.c
+++ b/drivers/net/wireless/mwl8k.c
@@ -204,6 +204,9 @@ struct mwl8k_priv {
 
         /* Tasklet to perform TX reclaim.  */
         struct tasklet_struct poll_tx_task;
+
+        /* Tasklet to perform RX.  */
+        struct tasklet_struct poll_rx_task;
 };
 
 /* Per interface specific private data */
@@ -2971,14 +2974,14 @@ static irqreturn_t mwl8k_interrupt(int irq, void *dev_id)
                 tasklet_schedule(&priv->poll_tx_task);
         }
 
-        if (status)
-                iowrite32(~status, priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS);
-
         if (status & MWL8K_A2H_INT_RX_READY) {
-                while (rxq_process(hw, 0, 1))
-                        rxq_refill(hw, 0, 1);
+                status &= ~MWL8K_A2H_INT_RX_READY;
+                tasklet_schedule(&priv->poll_rx_task);
         }
 
+        if (status)
+                iowrite32(~status, priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS);
+
         if (status & MWL8K_A2H_INT_OPC_DONE) {
                 if (priv->hostcmd_wait != NULL)
                         complete(priv->hostcmd_wait);
@@ -3022,6 +3025,24 @@ static void mwl8k_tx_poll(unsigned long data)
         }
 }
 
+static void mwl8k_rx_poll(unsigned long data)
+{
+        struct ieee80211_hw *hw = (struct ieee80211_hw *)data;
+        struct mwl8k_priv *priv = hw->priv;
+        int limit;
+
+        limit = 32;
+        limit -= rxq_process(hw, 0, limit);
+        limit -= rxq_refill(hw, 0, limit);
+
+        if (limit) {
+                writel(~MWL8K_A2H_INT_RX_READY,
+                       priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS);
+        } else {
+                tasklet_schedule(&priv->poll_rx_task);
+        }
+}
+
 
 /*
  * Core driver operations.
@@ -3057,8 +3078,9 @@ static int mwl8k_start(struct ieee80211_hw *hw)
                 return -EIO;
         }
 
-        /* Enable tx reclaim tasklet */
+        /* Enable TX reclaim and RX tasklets.  */
         tasklet_enable(&priv->poll_tx_task);
+        tasklet_enable(&priv->poll_rx_task);
 
         /* Enable interrupts */
         iowrite32(MWL8K_A2H_EVENTS, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);
@@ -3092,6 +3114,7 @@ static int mwl8k_start(struct ieee80211_hw *hw)
                 iowrite32(0, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);
                 free_irq(priv->pdev->irq, hw);
                 tasklet_disable(&priv->poll_tx_task);
+                tasklet_disable(&priv->poll_rx_task);
         }
 
         return rc;
@@ -3115,8 +3138,9 @@ static void mwl8k_stop(struct ieee80211_hw *hw)
         if (priv->beacon_skb != NULL)
                 dev_kfree_skb(priv->beacon_skb);
 
-        /* Stop tx reclaim tasklet */
+        /* Stop TX reclaim and RX tasklets.  */
         tasklet_disable(&priv->poll_tx_task);
+        tasklet_disable(&priv->poll_rx_task);
 
         /* Return all skbs to mac80211 */
         for (i = 0; i < MWL8K_TX_QUEUES; i++)
@@ -3873,9 +3897,11 @@ static int __devinit mwl8k_probe(struct pci_dev *pdev,
         /* Finalize join worker */
         INIT_WORK(&priv->finalize_join_worker, mwl8k_finalize_join_worker);
 
-        /* TX reclaim tasklet */
+        /* TX reclaim and RX tasklets.  */
         tasklet_init(&priv->poll_tx_task, mwl8k_tx_poll, (unsigned long)hw);
         tasklet_disable(&priv->poll_tx_task);
+        tasklet_init(&priv->poll_rx_task, mwl8k_rx_poll, (unsigned long)hw);
+        tasklet_disable(&priv->poll_rx_task);
 
         /* Power management cookie */
         priv->cookie = pci_alloc_consistent(priv->pdev, 4, &priv->cookie_dma);
@@ -3904,7 +3930,7 @@ static int __devinit mwl8k_probe(struct pci_dev *pdev,
 
         iowrite32(0, priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS);
         iowrite32(0, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);
-        iowrite32(MWL8K_A2H_INT_TX_DONE,
+        iowrite32(MWL8K_A2H_INT_TX_DONE | MWL8K_A2H_INT_RX_READY,
                   priv->regs + MWL8K_HIU_A2H_INTERRUPT_CLEAR_SEL);
         iowrite32(0xffffffff, priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS_MASK);
 
@@ -4032,8 +4058,9 @@ static void __devexit mwl8k_remove(struct pci_dev *pdev)
 
         ieee80211_unregister_hw(hw);
 
-        /* Remove tx reclaim tasklet */
+        /* Remove TX reclaim and RX tasklets.  */
         tasklet_kill(&priv->poll_tx_task);
+        tasklet_kill(&priv->poll_rx_task);
 
         /* Stop hardware */
         mwl8k_hw_reset(priv);