net/mlx5: fix memory region cache last index

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: stable@dpdk.org
Signed-off-by: Xueming Li <xuemingl@mellanox.com>
Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
Acked-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>

diff --git a/drivers/net/mlx5/mlx5_rxtx.h b/drivers/net/mlx5/mlx5_rxtx.h
index b40177d..7297f01 100644 (file)
--- 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);