igb: cleanup igb_netpoll to be more friendly with napi & GRO

This patch cleans up igb_netpoll so that it is more friendly with both the
current napi and newly introduced GRO features.
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/igb/igb.h

@@ -280,9 +280,8 @@ struct igb_adapter {
 #define IGB_FLAG_HAS_MSI           (1 << 0)
 #define IGB_FLAG_MSI_ENABLE        (1 << 1)
 #define IGB_FLAG_DCA_ENABLED       (1 << 2)
-#define IGB_FLAG_IN_NETPOLL        (1 << 3)
-#define IGB_FLAG_QUAD_PORT_A       (1 << 4)
-#define IGB_FLAG_NEED_CTX_IDX      (1 << 5)
+#define IGB_FLAG_QUAD_PORT_A       (1 << 3)
+#define IGB_FLAG_NEED_CTX_IDX      (1 << 4)
 
 enum e1000_state_t {
 	__IGB_TESTING,

drivers/net/igb/igb_main.c

@@ -4378,22 +4378,27 @@ static void igb_shutdown(struct pci_dev *pdev)
 static void igb_netpoll(struct net_device *netdev)
 {
 	struct igb_adapter *adapter = netdev_priv(netdev);
+	struct e1000_hw *hw = &adapter->hw;
 	int i;
-	int work_done = 0;
 
+	if (!adapter->msix_entries) {
 		igb_irq_disable(adapter);
-	adapter->flags |= IGB_FLAG_IN_NETPOLL;
-
-	for (i = 0; i < adapter->num_tx_queues; i++)
-		igb_clean_tx_irq(&adapter->tx_ring[i]);
+		napi_schedule(&adapter->rx_ring[0].napi);
+		return;
+	}
 
-	for (i = 0; i < adapter->num_rx_queues; i++)
-		igb_clean_rx_irq_adv(&adapter->rx_ring[i],
-				     &work_done,
-				     adapter->rx_ring[i].napi.weight);
+	for (i = 0; i < adapter->num_tx_queues; i++) {
+		struct igb_ring *tx_ring = &adapter->tx_ring[i];
+		wr32(E1000_EIMC, tx_ring->eims_value);
+		igb_clean_tx_irq(tx_ring);
+		wr32(E1000_EIMS, tx_ring->eims_value);
+	}
 
-	adapter->flags &= ~IGB_FLAG_IN_NETPOLL;
-	igb_irq_enable(adapter);
+	for (i = 0; i < adapter->num_rx_queues; i++) {
+		struct igb_ring *rx_ring = &adapter->rx_ring[i];
+		wr32(E1000_EIMC, rx_ring->eims_value);
+		napi_schedule(&rx_ring->napi);
+	}
 }
 #endif /* CONFIG_NET_POLL_CONTROLLER */