igb: add IGB_DCA instead of selecting INTEL_IOATDMA

Add a bool IGB_DCA defined to y if IGB and DCA are enabled, but IGB isn't y while DCA=m. And thus remove the need to select INTEL_IOATDMA when IGB is enabled, so that non-x86 architectures can build the igb driver.
Based on work/patch from Brice Goglin <[e-mail]>

Signed-off-by: Jeff Kirsher <[e-mail]>
Signed-off-by: Jeff Garzik <[e-mail]>

drivers/net/Kconfig

···
 
 	  If in doubt, say N.
 
+config IGB_DCA
+	bool "Enable DCA"
+	default y
+	depends on IGB && DCA && !(IGB=y && DCA=m)
+
 source "drivers/net/ixp2000/Kconfig"
 
 config MYRI_SBUS

drivers/net/igb/igb_main.c

···
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/if_ether.h>
-#ifdef CONFIG_DCA
+#ifdef CONFIG_IGB_DCA
 #include <linux/dca.h>
 #endif
 #include "igb.h"
···
 static irqreturn_t igb_msix_rx(int irq, void *);
 static irqreturn_t igb_msix_tx(int irq, void *);
 static int igb_clean_rx_ring_msix(struct napi_struct *, int);
-#ifdef CONFIG_DCA
+#ifdef CONFIG_IGB_DCA
 static void igb_update_rx_dca(struct igb_ring *);
 static void igb_update_tx_dca(struct igb_ring *);
 static void igb_setup_dca(struct igb_adapter *);
-#endif /* CONFIG_DCA */
+#endif /* CONFIG_IGB_DCA */
 static bool igb_clean_tx_irq(struct igb_ring *);
 static int igb_poll(struct napi_struct *, int);
 static bool igb_clean_rx_irq_adv(struct igb_ring *, int *, int);
···
 static int igb_resume(struct pci_dev *);
 #endif
 static void igb_shutdown(struct pci_dev *);
-#ifdef CONFIG_DCA
+#ifdef CONFIG_IGB_DCA
 static int igb_notify_dca(struct notifier_block *, unsigned long, void *);
 static struct notifier_block dca_notifier = {
 	.notifier_call	= igb_notify_dca,
···
 	global_quad_port_a = 0;
 
 	ret = pci_register_driver(&igb_driver);
-#ifdef CONFIG_DCA
+#ifdef CONFIG_IGB_DCA
 	dca_register_notify(&dca_notifier);
 #endif
 	return ret;
···
  **/
 static void __exit igb_exit_module(void)
 {
-#ifdef CONFIG_DCA
+#ifdef CONFIG_IGB_DCA
 	dca_unregister_notify(&dca_notifier);
 #endif
 	pci_unregister_driver(&igb_driver);
···
 	if (err)
 		goto err_register;
 
-#ifdef CONFIG_DCA
+#ifdef CONFIG_IGB_DCA
 	if ((adapter->flags & IGB_FLAG_HAS_DCA) &&
 	    (dca_add_requester(&pdev->dev) == 0)) {
 		adapter->flags |= IGB_FLAG_DCA_ENABLED;
···
 {
 	struct net_device *netdev = pci_get_drvdata(pdev);
 	struct igb_adapter *adapter = netdev_priv(netdev);
-#ifdef CONFIG_DCA
+#ifdef CONFIG_IGB_DCA
 	struct e1000_hw *hw = &adapter->hw;
 #endif
 
···
 
 	flush_scheduled_work();
 
-#ifdef CONFIG_DCA
+#ifdef CONFIG_IGB_DCA
 	if (adapter->flags & IGB_FLAG_DCA_ENABLED) {
 		dev_info(&pdev->dev, "DCA disabled\n");
 		dca_remove_requester(&pdev->dev);
···
 	struct igb_adapter *adapter = tx_ring->adapter;
 	struct e1000_hw *hw = &adapter->hw;
 
-#ifdef CONFIG_DCA
+#ifdef CONFIG_IGB_DCA
 	if (adapter->flags & IGB_FLAG_DCA_ENABLED)
 		igb_update_tx_dca(tx_ring);
 #endif
···
 	if (netif_rx_schedule_prep(adapter->netdev, &rx_ring->napi))
 		__netif_rx_schedule(adapter->netdev, &rx_ring->napi);
 
-#ifdef CONFIG_DCA
+#ifdef CONFIG_IGB_DCA
 	if (adapter->flags & IGB_FLAG_DCA_ENABLED)
 		igb_update_rx_dca(rx_ring);
 #endif
 		return IRQ_HANDLED;
 }
 
-#ifdef CONFIG_DCA
+#ifdef CONFIG_IGB_DCA
 static void igb_update_rx_dca(struct igb_ring *rx_ring)
 {
 	u32 dca_rxctrl;
···
 
 	return ret_val ? NOTIFY_BAD : NOTIFY_DONE;
 }
-#endif /* CONFIG_DCA */
+#endif /* CONFIG_IGB_DCA */
 
 /**
  * igb_intr_msi - Interrupt Handler
···
 	int tx_clean_complete, work_done = 0;
 
 	/* this poll routine only supports one tx and one rx queue */
-#ifdef CONFIG_DCA
+#ifdef CONFIG_IGB_DCA
 	if (adapter->flags & IGB_FLAG_DCA_ENABLED)
 		igb_update_tx_dca(&adapter->tx_ring[0]);
 #endif
 	tx_clean_complete = igb_clean_tx_irq(&adapter->tx_ring[0]);
 
-#ifdef CONFIG_DCA
+#ifdef CONFIG_IGB_DCA
 	if (adapter->flags & IGB_FLAG_DCA_ENABLED)
 		igb_update_rx_dca(&adapter->rx_ring[0]);
 #endif
···
 	struct net_device *netdev = adapter->netdev;
 	int work_done = 0;
 
-#ifdef CONFIG_DCA
+#ifdef CONFIG_IGB_DCA
 	if (adapter->flags & IGB_FLAG_DCA_ENABLED)
 		igb_update_rx_dca(rx_ring);
 #endif