ixgbe: Fix DCB netlink layer for 82599 to enable Priority Flow Control

The priority flow control settings from the netlink layer aren't taking
effect in the base driver. The boolean pfc_mode_enable in the dcb_config
struct isn't being set, so the hardware configuration code is never
reached.

Signed-off-by: Peter P Waskiewicz Jr <[e-mail]>
Signed-off-by: Jeff Kirsher <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ixgbe/ixgbe_dcb_nl.c

···
 			src_dcb_cfg->tc_config[i - DCB_PFC_UP_ATTR_0].dcb_pfc;
 	}
 
+	dst_dcb_cfg->pfc_mode_enable = src_dcb_cfg->pfc_mode_enable;
+
 	return 0;
 }
 
···
 
 	adapter->temp_dcb_cfg.tc_config[priority].dcb_pfc = setting;
 	if (adapter->temp_dcb_cfg.tc_config[priority].dcb_pfc !=
-	    adapter->dcb_cfg.tc_config[priority].dcb_pfc)
+	    adapter->dcb_cfg.tc_config[priority].dcb_pfc) {
 		adapter->dcb_set_bitmap |= BIT_PFC;
+		adapter->temp_dcb_cfg.pfc_mode_enable = true;
+	}
 }
 
 static void ixgbe_dcbnl_get_pfc_cfg(struct net_device *netdev, int priority,