ice: Copy dcbx configuration only if mode is correct

In rebuild DCB desired_dcbx_cfg was copy to local_dcbx_cfg, but
if DCBX mode is IEEE desired_dcbx_cfg is not initialized by DCBX
config from FW. Change logic to copy config value only if mode is
set to CEE.

If driver copy desired_dcbx_cfg to local_dcbx_cfg in IEEE mode there
is problem with globr. System is frozen after two or more globr.
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ice/ice_dcb_lib.c

@@ -334,8 +334,10 @@ void ice_dcb_rebuild(struct ice_pf *pf)
 	devm_kfree(&pf->pdev->dev, prev_cfg);
 
 	/* Set the local desired config */
-	memset(&pf->hw.port_info->local_dcbx_cfg, 0, sizeof(*local_dcbx_cfg));
-	memcpy(local_dcbx_cfg, desired_dcbx_cfg, sizeof(*local_dcbx_cfg));
+	if (local_dcbx_cfg->dcbx_mode == ICE_DCBX_MODE_CEE)
+		memcpy(local_dcbx_cfg, desired_dcbx_cfg,
+		       sizeof(*local_dcbx_cfg));
+
 	ice_cfg_etsrec_defaults(pf->hw.port_info);
 	ret = ice_set_dcb_cfg(pf->hw.port_info);
 	if (ret) {