[PATCH] net/mlx5: fix indexed pool fetch overlap issue

[Suanming Mou <suanmingm@nvidia.com>]

For indexed pool with local cache, when a new trunk is allocated,
half of the trunk's index was fetched to the local cache. In case
of local cache size was less then half of the trunk size, memory
overlap happened.

This commit adds the check of the fetch size, if local cache size
is less than fetch size, adjust the fetch size to be local cache
size.

Fixes: d15c0946beea ("net/mlx5: add indexed pool local cache")
Cc: stable@dpdk.org

Signed-off-by: Suanming Mou <suanmingm@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
---
 drivers/net/mlx5/mlx5_utils.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/mlx5/mlx5_utils.c b/drivers/net/mlx5/mlx5_utils.c
index be33af96fe..4115a2ad77 100644
--- a/drivers/net/mlx5/mlx5_utils.c
+++ b/drivers/net/mlx5/mlx5_utils.c
@@ -340,6 +340,8 @@ mlx5_ipool_allocate_from_global(struct mlx5_indexed_pool *pool, int cidx)
 	/* Enqueue half of the index to global. */
 	ts_idx = mlx5_trunk_idx_offset_get(pool, trunk_idx) + 1;
 	fetch_size = trunk->free >> 1;
+	if (fetch_size > pool->cfg.per_core_cache)
+		fetch_size = trunk->free - pool->cfg.per_core_cache;
 	for (i = 0; i < fetch_size; i++)
 		lc->idx[i] = ts_idx + i;
 	lc->len = fetch_size;
-- 
2.25.1