--- /home/luigi/ksrc/linux-3.5/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c	2012-07-21 22:58:29.000000000 +0200
+++ net/ixgbe/ixgbe_main.c	2012-08-13 08:47:41.000000000 +0200
@@ -204,6 +204,22 @@ static const struct ixgbe_reg_info ixgbe
 	{}
 };
 
+#if defined(CONFIG_NETMAP) || defined(CONFIG_NETMAP_MODULE)
+/*
+ * The #ifdef DEV_NETMAP / #endif blocks in this file are meant to
+ * be a reference on how to implement netmap support in a driver.
+ * Additional comments are in ixgbe_netmap_linux.h .
+ *
+ * The code is originally developed on FreeBSD and in the interest
+ * of maintainability we try to limit differences between the two systems.
+ *
+ * <ixgbe_netmap_linux.h> contains functions for netmap support
+ * that extend the standard driver.
+ * It also defines DEV_NETMAP so further conditional sections use
+ * that instead of CONFIG_NETMAP
+ */
+#include <ixgbe_netmap_linux.h>
+#endif
 
 /*
  * ixgbe_regdump - register printout routine
@@ -764,6 +780,17 @@ static bool ixgbe_clean_tx_irq(struct ix
 	if (test_bit(__IXGBE_DOWN, &adapter->state))
 		return true;
 
+#ifdef DEV_NETMAP
+	/*
+	 * In netmap mode, all the work is done in the context
+	 * of the client thread. Interrupt handlers only wake up
+	 * clients, which may be sleeping on individual rings
+	 * or on a global resource for all rings.
+	 */
+	if (netmap_tx_irq(adapter->netdev, tx_ring->queue_index))
+		return 1; /* seems to be ignored */
+#endif /* DEV_NETMAP */
+
 	tx_buffer = &tx_ring->tx_buffer_info[i];
 	tx_desc = IXGBE_TX_DESC(tx_ring, i);
 	i -= tx_ring->count;
@@ -1665,6 +1692,15 @@ static bool ixgbe_clean_rx_irq(struct ix
 #endif /* IXGBE_FCOE */
 	u16 cleaned_count = ixgbe_desc_unused(rx_ring);
 
+#ifdef DEV_NETMAP
+	/*
+	 * 	 Same as the txeof routine: only wakeup clients on intr.
+	 */
+	int dummy;
+	if (netmap_rx_irq(rx_ring->netdev, rx_ring->queue_index, &dummy))
+		return true; /* no more interrupts */
+#endif /* DEV_NETMAP */
+
 	do {
 		struct ixgbe_rx_buffer *rx_buffer;
 		union ixgbe_adv_rx_desc *rx_desc;
@@ -2725,6 +2761,9 @@ void ixgbe_configure_tx_ring(struct ixgb
 	} while (--wait_loop && !(txdctl & IXGBE_TXDCTL_ENABLE));
 	if (!wait_loop)
 		e_err(drv, "Could not enable Tx Queue %d\n", reg_idx);
+#ifdef DEV_NETMAP
+	ixgbe_netmap_configure_tx_ring(adapter, reg_idx);
+#endif /* DEV_NETMAP */
 }
 
 static void ixgbe_setup_mtqc(struct ixgbe_adapter *adapter)
@@ -3102,6 +3141,10 @@ void ixgbe_configure_rx_ring(struct ixgb
 	IXGBE_WRITE_REG(hw, IXGBE_RXDCTL(reg_idx), rxdctl);
 
 	ixgbe_rx_desc_queue_enable(adapter, ring);
+#ifdef DEV_NETMAP
+	if (ixgbe_netmap_configure_rx_ring(adapter, reg_idx))
+		return;
+#endif /* DEV_NETMAP */
 	ixgbe_alloc_rx_buffers(ring, ixgbe_desc_unused(ring));
 }
 
@@ -4827,6 +4870,10 @@ static int ixgbe_open(struct net_device
 
 	ixgbe_up_complete(adapter);
 
+#ifdef DEV_NETMAP
+	ixgbe_netmap_attach(adapter);
+#endif /* DEV_NETMAP */
+
 	return 0;
 
 err_req_irq:
