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 <john.r.fastabend@intel.com>
Tested-by: Ross Brattain <ross.b.brattain.@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 23 insertions, 1 deletions

diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index 3694226462da..3ce0f4f956df 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -4606,7 +4606,10 @@ int ixgbe_setup_tc(struct net_device *dev, u8 tc)
         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 */
@@ -4616,6 +4619,22 @@ int ixgbe_setup_tc(struct net_device *dev, u8 tc)
                         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;
 }
@@ -7022,6 +7041,9 @@ static const struct net_device_ops ixgbe_netdev_ops = {
         .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