[dpdk-dev] [PATCH v2 5/6] net/mlx5: fix Memory Region cache last index

[Shahaf Shuler]

In case Memory Region cache is full, the new mempool will be
inserted in the last index of the array.

Update the last entry being hit to reflect it.

Fixes: b0b093845793 ("net/mlx5: use buffer address for LKEY search")
Cc: sta...@dpdk.org
Cc: ys...@mellanox.com

Signed-off-by: Xueming Li <xuemi...@mellanox.com>
Signed-off-by: Shahaf Shuler <shah...@mellanox.com>
Acked-by: Nelio Laranjeiro <nelio.laranje...@6wind.com>
---
 drivers/net/mlx5/mlx5_rxtx.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5_rxtx.h b/drivers/net/mlx5/mlx5_rxtx.h
index e6d163a59..7e7db0e8c 100644
--- a/drivers/net/mlx5/mlx5_rxtx.h
+++ b/drivers/net/mlx5/mlx5_rxtx.h
@@ -567,7 +567,6 @@ mlx5_tx_mb2mr(struct mlx5_txq_data *txq, struct rte_mbuf 
*mb)
                        return txq->mp2mr[i]->lkey;
                }
        }
-       txq->mr_cache_idx = 0;
        mr = mlx5_txq_mp2mr_reg(txq, mlx5_tx_mb2mp(mb), i);
        /*
         * Request the reference to use in this queue, the original one is
@@ -575,6 +574,7 @@ mlx5_tx_mb2mr(struct mlx5_txq_data *txq, struct rte_mbuf 
*mb)
         */
        if (mr) {
                rte_atomic32_inc(&mr->refcnt);
+               txq->mr_cache_idx = i >= RTE_DIM(txq->mp2mr) ? i - 1 : i;
                return mr->lkey;
        } else {
                struct rte_mempool *mp = mlx5_tx_mb2mp(mb);
-- 
2.12.0