FBNIC_IPC_MBX
#define FBNIC_FW_ZERO_REG FBNIC_IPC_MBX(0, 0)
fw_wr32(fbd, FBNIC_IPC_MBX(mbx_idx, mbx->tail), 0);
fw_wr32(fbd, FBNIC_IPC_MBX(FBNIC_IPC_MBX_RX_IDX, head), 0);
u32 desc_offset = FBNIC_IPC_MBX(mbx_idx, desc_idx);
u32 desc_offset = FBNIC_IPC_MBX(mbx_idx, desc_idx);
u32 desc_offset = FBNIC_IPC_MBX(mbx_idx, desc_idx);