[dpdk-dev] [PATCH 1/4] table: fix empty bucket removal during entry deletion in rte_table_hash_ext

[Neil Horman]

On Thu, Sep 25, 2014 at 03:24:35PM +0000, Balazs Nemeth wrote:
> When an entry is deleted from an extensible rte_table_hash, the bucket
> that stored the entry can become empty. If this is the case, the
> bucket needs to be removed from the chain of buckets.
> 
> During removal of the bucket, the chain should be updated first. If
> the bucket that will be removed is cleared first, the chain is broken
> and the information to update the chain is lost.
> 
> Acked-by: Cristian Dumitrescu <cristian.dumitrescu at intel.com>
> Signed-off-by: Balazs Nemeth <balazs.nemeth at intel.com>
> ---
>  lib/librte_table/rte_table_hash_ext.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/lib/librte_table/rte_table_hash_ext.c b/lib/librte_table/rte_table_hash_ext.c
> index 6e26d98..17c16cd 100644
> --- a/lib/librte_table/rte_table_hash_ext.c
> +++ b/lib/librte_table/rte_table_hash_ext.c
> @@ -408,12 +408,12 @@ void *entry)
>  				if ((bkt_prev != NULL) &&
>  				    (bkt->sig[0] == 0) && (bkt->sig[1] == 0) &&
>  				    (bkt->sig[2] == 0) && (bkt->sig[3] == 0)) {
> -					/* Clear bucket */
> -					memset(bkt, 0, sizeof(struct bucket));
> -
>  					/* Unchain bucket */
>  					BUCKET_NEXT_COPY(bkt_prev, bkt);
> 
> +					/* Clear bucket */
> +					memset(bkt, 0, sizeof(struct bucket));
> +
>  					/* Free bucket back to buckets ext */
>  					bkt_index = bkt - t->buckets_ext;
>  					t->bkt_ext_stack[t->bkt_ext_stack_tos++]
Acked-by: Neil Horman <nhorman at tuxdriver.com>

> --
> 2.1.0
> Intel Corporation NV/SA
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