atl1: add napi process of tx interrupts

Make the tx ints processing same as rx ones via napi.
The idea got from e1000. The interrupt disabling is
still not fine grained.
Signed-off-by: Tony Zelenoff <antonz@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/atheros/atlx/atl1.c

@@ -2069,12 +2069,13 @@ static int atl1_intr_rx(struct atl1_adapter *adapter, int budget)
 	return count;
 }
 
-static void atl1_intr_tx(struct atl1_adapter *adapter)
+static int atl1_intr_tx(struct atl1_adapter *adapter)
 {
 	struct atl1_tpd_ring *tpd_ring = &adapter->tpd_ring;
 	struct atl1_buffer *buffer_info;
 	u16 sw_tpd_next_to_clean;
 	u16 cmb_tpd_next_to_clean;
+	int count = 0;
 
 	sw_tpd_next_to_clean = atomic_read(&tpd_ring->next_to_clean);
 	cmb_tpd_next_to_clean = le16_to_cpu(adapter->cmb.cmb->tpd_cons_idx);
@@ -2094,12 +2095,16 @@ static void atl1_intr_tx(struct atl1_adapter *adapter)
 
 		if (++sw_tpd_next_to_clean == tpd_ring->count)
 			sw_tpd_next_to_clean = 0;
+
+		count++;
 	}
 	atomic_set(&tpd_ring->next_to_clean, sw_tpd_next_to_clean);
 
 	if (netif_queue_stopped(adapter->netdev) &&
 	    netif_carrier_ok(adapter->netdev))
 		netif_wake_queue(adapter->netdev);
+
+	return count;
 }
 
 static u16 atl1_tpd_avail(struct atl1_tpd_ring *tpd_ring)
@@ -2441,11 +2446,14 @@ static netdev_tx_t atl1_xmit_frame(struct sk_buff *skb,
 	return NETDEV_TX_OK;
 }
 
-static int atl1_rx_clean(struct napi_struct *napi, int budget)
+static int atl1_rings_clean(struct napi_struct *napi, int budget)
 {
 	struct atl1_adapter *adapter = container_of(napi, struct atl1_adapter, napi);
 	int work_done = atl1_intr_rx(adapter, budget);
 
+	if (atl1_intr_tx(adapter))
+		work_done = budget;
+
 	/* Let's come again to process some more packets */
 	if (work_done >= budget)
 		return work_done;
@@ -2456,7 +2464,7 @@ static int atl1_rx_clean(struct napi_struct *napi, int budget)
 	return work_done;
 }
 
-static inline int atl1_sched_rx(struct atl1_adapter* adapter)
+static inline int atl1_sched_rings_clean(struct atl1_adapter* adapter)
 {
 	if (likely(napi_schedule_prep(&adapter->napi))) {
 		__napi_schedule(&adapter->napi);
@@ -2527,12 +2535,9 @@ static irqreturn_t atl1_intr(int irq, void *data)
 			atl1_check_for_link(adapter);
 		}
 
-		/* transmit event */
-		if (status & ISR_CMB_TX)
-			atl1_intr_tx(adapter);
-
-		/* rx event */
-		if (status & ISR_CMB_RX && atl1_sched_rx(adapter))
+		/* transmit or receive event */
+		if (status & (ISR_CMB_TX | ISR_CMB_RX) &&
+		    atl1_sched_rings_clean(adapter))
 			/* Go away with INTs disabled */
 			return IRQ_HANDLED;
 
@@ -2545,7 +2550,7 @@ static irqreturn_t atl1_intr(int irq, void *data)
 					&adapter->pdev->dev,
 					"rx exception, ISR = 0x%x\n",
 					status);
-			if (atl1_sched_rx(adapter))
+			if (atl1_sched_rings_clean(adapter))
 				return IRQ_HANDLED;
 		}
 
@@ -3005,7 +3010,7 @@ static int __devinit atl1_probe(struct pci_dev *pdev,
 
 	netdev->netdev_ops = &atl1_netdev_ops;
 	netdev->watchdog_timeo = 5 * HZ;
-	netif_napi_add(netdev, &adapter->napi, atl1_rx_clean, 64);
+	netif_napi_add(netdev, &adapter->napi, atl1_rings_clean, 64);
 
 	netdev->ethtool_ops = &atl1_ethtool_ops;
 	adapter->bd_number = cards_found;