ixgbe: enable ndo_tc_setup

This patch adds the ndo_tc_setup to ixgbe. By default we set
the device to use strict priority.

Signed-off-by: John Fastabend <[e-mail]>
Tested-by: Ross Brattain <[e-mail]>
Signed-off-by: Jeff Kirsher <[e-mail]>

drivers/net/ixgbe/ixgbe_main.c

···
 	if (!tc) {
 		netdev_reset_tc(dev);
 	} else {
-		if (netdev_set_num_tc(dev, tc))
+		struct ixgbe_adapter *adapter = netdev_priv(dev);
+
+		/* Hardware supports up to 8 traffic classes */
+		if (tc > MAX_TRAFFIC_CLASS || netdev_set_num_tc(dev, tc))
 			return -EINVAL;
 
 		/* Partition Tx queues evenly amongst traffic classes */
···
 			netdev_set_prio_tc_map(dev, i, i);
 			netdev_set_tc_queue(dev, i, q, offset);
 			offset += q;
+		}
+
+		/* This enables multiple traffic class support in the hardware
+		 * which defaults to strict priority transmission by default.
+		 * If traffic classes are already enabled perhaps through DCB
+		 * code path then existing configuration will be used.
+		 */
+		if (!(adapter->flags & IXGBE_FLAG_DCB_ENABLED) &&
+		    dev->dcbnl_ops && dev->dcbnl_ops->setdcbx) {
+			struct ieee_ets ets = {
+					.prio_tc = {0, 1, 2, 3, 4, 5, 6, 7},
+					      };
+			u8 mode = DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE;
+
+			dev->dcbnl_ops->setdcbx(dev, mode);
+			dev->dcbnl_ops->ieee_setets(dev, &ets);
 		}
 	}
 	return 0;
···
 	.ndo_set_vf_tx_rate	= ixgbe_ndo_set_vf_bw,
 	.ndo_get_vf_config	= ixgbe_ndo_get_vf_config,
 	.ndo_get_stats64	= ixgbe_get_stats64,
+#ifdef CONFIG_IXGBE_DCB
+	.ndo_setup_tc		= ixgbe_setup_tc,
+#endif
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_poll_controller	= ixgbe_netpoll,
 #endif