> +
> +static int
> +intel_ntb_dev_init(const struct rte_rawdev *dev) {
> + struct ntb_hw *hw = dev->dev_private;
> + uint8_t bar;
> + int ret, i;
> +
> + if (hw == NULL) {
> + NTB_LOG(ERR, "Invalid device.");
> + return -EINVAL;
> + }
> +
> hw->hw_addr = (char *)hw->pci_dev->mem_resource[0].addr;
>
> + if (is_gen3_ntb(hw)) {
> + ret = intel_ntb3_check_ppd(hw);
> + } else if (is_gen4_ntb(hw)) {
> + /* PPD is in MMIO but not config space for NTB Gen4 */
> + ret = intel_ntb4_check_ppd(hw);
> + if (ret)
> + return ret;
Above two lines are not necessary.
> + } else {
> + return -ENOTSUP;
> + }
> +
> + if (ret)
> + return ret;
> +
> hw->mw_cnt = XEON_MW_COUNT;
> hw->db_cnt = XEON_DB_COUNT;
> hw->spad_cnt = XEON_SPAD_COUNT;
> @@ -149,15 +219,28 @@ intel_ntb_mw_set_trans(const struct rte_rawdev
> *dev, int mw_idx,
> rte_write64(base, xlat_addr);
> rte_write64(limit, limit_addr);
>
> - /* Setup the external point so that remote can access. */
> - xlat_off = XEON_EMBAR1_OFFSET + 8 * mw_idx;
> - xlat_addr = hw->hw_addr + xlat_off;
> - limit_off = XEON_EMBAR1XLMT_OFFSET + mw_idx *
> XEON_BAR_INTERVAL_OFFSET;
> - limit_addr = hw->hw_addr + limit_off;
> - base = rte_read64(xlat_addr);
> - base &= ~0xf;
> - limit = base + size;
> - rte_write64(limit, limit_addr);
> + if (is_gen3_ntb(hw)) {
> + /* Setup the external point so that remote can access. */
> + xlat_off = XEON_EMBAR1_OFFSET + 8 * mw_idx;
> + xlat_addr = hw->hw_addr + xlat_off;
> + limit_off = XEON_EMBAR1XLMT_OFFSET +
> + mw_idx * XEON_BAR_INTERVAL_OFFSET;
> + limit_addr = hw->hw_addr + limit_off;
> + base = rte_read64(xlat_addr);
> + base &= ~0xf;
> + limit = base + size;
> + rte_write64(limit, limit_addr);
> + } else if (is_gen4_ntb(hw)) {
Can we use a variable in struct to indicate it's gen4 or gen3 after init
instead of check it every time?
> + /* Set translate base address index register */
> + xlat_off = XEON_GEN4_IM1XBASEIDX_OFFSET +
> + mw_idx * XEON_GEN4_XBASEIDX_INTERVAL;
> + xlat_addr = hw->hw_addr + xlat_off;
> + rte_write16(rte_log2_u64(size), xlat_addr);
> + } else {
> + rte_write64(base, limit_addr);
> + rte_write64(0, xlat_addr);
> + return -ENOTSUP;
> + }
Is the else branch necessary? As if neither gen3 or gen4, the init would fail.
Would be better to print an ERR instead of just return NO support.
>
> return 0;
> }
