+static void igb_setup_dca(struct igb_adapter *adapter)
+{
+ int i;
+
+ if (!(adapter->flags & IGB_FLAG_DCA_ENABLED))
+ return;
+
+ for (i = 0; i < adapter->num_tx_queues; i++) {
+ adapter->tx_ring[i].cpu = -1;
+ igb_update_tx_dca(&adapter->tx_ring[i]);
+ }
+ for (i = 0; i < adapter->num_rx_queues; i++) {
+ adapter->rx_ring[i].cpu = -1;
+ igb_update_rx_dca(&adapter->rx_ring[i]);
+ }
+}
+
+static int __igb_notify_dca(struct device *dev, void *data)
+{
+ struct net_device *netdev = dev_get_drvdata(dev);
+ struct igb_adapter *adapter = netdev_priv(netdev);
+ struct e1000_hw *hw = &adapter->hw;
+ unsigned long event = *(unsigned long *)data;
+
+ if (!(adapter->flags & IGB_FLAG_HAS_DCA))
+ goto out;
+
+ switch (event) {
+ case DCA_PROVIDER_ADD:
+ /* if already enabled, don't do it again */
+ if (adapter->flags & IGB_FLAG_DCA_ENABLED)
+ break;
+ adapter->flags |= IGB_FLAG_DCA_ENABLED;
+ /* Always use CB2 mode, difference is masked
+ * in the CB driver. */
+ wr32(E1000_DCA_CTRL, 2);
+ if (dca_add_requester(dev) == 0) {
+ dev_info(&adapter->pdev->dev, "DCA enabled\n");
+ igb_setup_dca(adapter);
+ break;
+ }
+ /* Fall Through since DCA is disabled. */
+ case DCA_PROVIDER_REMOVE:
+ if (adapter->flags & IGB_FLAG_DCA_ENABLED) {
+ /* without this a class_device is left
+ * hanging around in the sysfs model */
+ dca_remove_requester(dev);
+ dev_info(&adapter->pdev->dev, "DCA disabled\n");
+ adapter->flags &= ~IGB_FLAG_DCA_ENABLED;
+ wr32(E1000_DCA_CTRL, 1);
+ }
+ break;
+ }
+out:
+ return 0;
+}
+
+static int igb_notify_dca(struct notifier_block *nb, unsigned long event,
+ void *p)
+{
+ int ret_val;
+
+ ret_val = driver_for_each_device(&igb_driver.driver, NULL, &event,
+ __igb_notify_dca);
+
+ return ret_val ? NOTIFY_BAD : NOTIFY_DONE;
+}
+#endif /* CONFIG_DCA */