ixgbe: fix broken PFC with X550

commit cb78cf12 upstream.

PFC is configuration is skipped for X550 devices due to a incorrect
device id check, fixing that to include X550 PFC configuration.
Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82599.c

@@ -222,13 +222,13 @@ s32 ixgbe_dcb_config_pfc_82599(struct ixgbe_hw *hw, u8 pfc_en, u8 *prio_tc)
 	reg |= IXGBE_MFLCN_DPF;
 
 	/*
-	 * X540 supports per TC Rx priority flow control.  So
-	 * clear all TCs and only enable those that should be
+	 * X540 & X550 supports per TC Rx priority flow control.
+	 * So clear all TCs and only enable those that should be
 	 * enabled.
 	 */
 	reg &= ~(IXGBE_MFLCN_RPFCE_MASK | IXGBE_MFLCN_RFCE);
 
-	if (hw->mac.type == ixgbe_mac_X540)
+	if (hw->mac.type >= ixgbe_mac_X540)
 		reg |= pfc_en << IXGBE_MFLCN_RPFCE_SHIFT;
 
 	if (pfc_en)