ixgbe: fix the display of DCB control stats in ethtool

Priority flow contol statistics for Data Center Bridging (DCB) weren't
included in ethtool.  This patch adds them.
Signed-off-by: NDon Skidmore <donald.c.skidmore@intel.com>
Signed-off-by: NEric W Multanen <eric.w.multanen@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ixgbe/ixgbe_ethtool.c

@@ -881,8 +881,15 @@ static void ixgbe_get_strings(struct net_device *netdev, u32 stringset,
 		if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
 			for (i = 0; i < MAX_TX_PACKET_BUFFERS; i++) {
 				sprintf(p, "tx_pb_%u_pxon", i);
+				p += ETH_GSTRING_LEN;
+				sprintf(p, "tx_pb_%u_pxoff", i);
+				p += ETH_GSTRING_LEN;
 			}
 			for (i = 0; i < MAX_RX_PACKET_BUFFERS; i++) {
+				sprintf(p, "rx_pb_%u_pxon", i);
+				p += ETH_GSTRING_LEN;
+				sprintf(p, "rx_pb_%u_pxoff", i);
+				p += ETH_GSTRING_LEN;
 			}
 		}
 		/* BUG_ON(p - data != IXGBE_STATS_LEN * ETH_GSTRING_LEN); */