> -----Original Message-----
> From: Tao, Zhe
> Sent: Thursday, July 30, 2015 11:19 AM
> To: dev at dpdk.org
> Cc: Tao, Zhe; Liang, Cunming; Richardson, Bruce
> Subject: [dpdk-dev][PATCH v2] lpm: fix extended flag check when adding a
> "depth small" entry
>
> When adding a "depth small" entry, if its extended flag is not set and
> its depth is smaller than the one in the tbl24, nothing should be done
> otherwise will operate on the wrong memory area.
>
> Signed-off-by: Zhe Tao <zhe.tao at intel.com>
> ---
> PATCH v2: Edit to keep line size below 80 characters
>
> PATCH v1: Fix extended flag check when adding a "depth small" entry
>
> lib/librte_lpm/rte_lpm.c | 54 +++++++++++++++++++++++++++-------------------
> --
> 1 file changed, 30 insertions(+), 24 deletions(-)
>
> diff --git a/lib/librte_lpm/rte_lpm.c b/lib/librte_lpm/rte_lpm.c
> index de05307..163ba3c 100644
> --- a/lib/librte_lpm/rte_lpm.c
> +++ b/lib/librte_lpm/rte_lpm.c
> @@ -442,35 +442,41 @@ add_depth_small(struct rte_lpm *lpm, uint32_t ip,
> uint8_t depth,
> };
>
> /* Setting tbl24 entry in one go to avoid race
> - * conditions */
> + * conditions
> + */
> lpm->tbl24[i] = new_tbl24_entry;
>
> continue;
> }
>
> - /* If tbl24 entry is valid and extended calculate the index
> - * into tbl8. */
> - tbl8_index = lpm->tbl24[i].tbl8_gindex *
> - RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
> - tbl8_group_end = tbl8_index +
> RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
> -
> - for (j = tbl8_index; j < tbl8_group_end; j++) {
> - if (!lpm->tbl8[j].valid ||
> - lpm->tbl8[j].depth <= depth) {
> - struct rte_lpm_tbl8_entry new_tbl8_entry = {
> - .valid = VALID,
> - .valid_group = VALID,
> - .depth = depth,
> - .next_hop = next_hop,
> - };
> -
> - /*
> - * Setting tbl8 entry in one go to avoid race
> - * conditions
> - */
> - lpm->tbl8[j] = new_tbl8_entry;
> -
> - continue;
> + if (lpm->tbl24[i].ext_entry == 1) {
> + /* If tbl24 entry is valid and extended calculate the
> + * index into tbl8.
> + */
> + tbl8_index = lpm->tbl24[i].tbl8_gindex *
> + RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
> + tbl8_group_end = tbl8_index +
> + RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
> +
> + for (j = tbl8_index; j < tbl8_group_end; j++) {
> + if (!lpm->tbl8[j].valid ||
> + lpm->tbl8[j].depth <= depth) {
> + struct rte_lpm_tbl8_entry
> + new_tbl8_entry = {
> + .valid = VALID,
> + .valid_group = VALID,
> + .depth = depth,
> + .next_hop = next_hop,
> + };
> +
> + /*
> + * Setting tbl8 entry in one go to avoid
> + * race conditions
> + */
> + lpm->tbl8[j] = new_tbl8_entry;
> +
> + continue;
> + }
> }
> }
> }
> --
> 1.9.3
Acked-by: Cunming Liang <cunming.liang at intel.com>