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call _rte_eth_dev_callback_process from ixgbe_rcv_msg_from_vf function. The callback asks the user application if it is allowed to perform the function. If the cb_param.retval is RTE_PMD_IXGBE_MB_EVENT_PROCEED then continue, if 0, do nothing and send ACK to VF if > 1, do nothing and send NAK to VF. Signed-off-by: Alex Zelezniak <alexz@att.com> Signed-off-by: Bernard Iremonger <bernard.iremonger@intel.com>