sli_cmd_reg_rpi
if (sli_cmd_reg_rpi(&hw->sli, buf, SLI4_BMBX_SIZE, rnode->fc_id,
extern int32_t sli_cmd_reg_rpi(sli4_t *, void *, size_t, uint32_t, uint16_t, uint16_t, ocs_dma_t *, uint8_t, uint8_t);