mbx_state
enum mbx_state mbx_state;
mbx->sw_mbx.mbx_state = VF_PF_RESPONSE_READY;
vf->vf_mbx.sw_mbx.mbx_state = VF_PF_WAIT_FOR_START_REQUEST;
vf->vf_mbx.sw_mbx.mbx_state = VF_PF_WAIT_FOR_START_REQUEST;