net/mlx5: reduce memory overhead of Rx/Tx descriptors

[dpdk.git] / drivers / net / mlx5 / mlx5_txq.c

diff --git a/drivers/net/mlx5/mlx5_txq.c b/drivers/net/mlx5/mlx5_txq.c
index 269ffe6..d9e61ed 100644 (file)
--- a/drivers/net/mlx5/mlx5_txq.c
+++ b/drivers/net/mlx5/mlx5_txq.c
@@ -101,7 +101,7 @@ txq_alloc_elts(struct txq_ctrl *txq_ctrl, unsigned int elts_n)
 static void
 txq_free_elts(struct txq_ctrl *txq_ctrl)
 {
-       unsigned int elts_n = txq_ctrl->txq.elts_n;
+       unsigned int elts_n = 1 << txq_ctrl->txq.elts_n;
        unsigned int elts_head = txq_ctrl->txq.elts_head;
        unsigned int elts_tail = txq_ctrl->txq.elts_tail;
        struct rte_mbuf *(*elts)[elts_n] = txq_ctrl->txq.elts;
@@ -227,7 +227,7 @@ txq_setup(struct txq_ctrl *tmpl, struct txq_ctrl *txq_ctrl)
                (volatile struct mlx5_cqe (*)[])
                (uintptr_t)cq->active_buf->buf;
        tmpl->txq.elts =
-               (struct rte_mbuf *(*)[tmpl->txq.elts_n])
+               (struct rte_mbuf *(*)[1 << tmpl->txq.elts_n])
                ((uintptr_t)txq_ctrl + sizeof(*txq_ctrl));
        return 0;
 }
@@ -277,7 +277,7 @@ txq_ctrl_setup(struct rte_eth_dev *dev, struct txq_ctrl *txq_ctrl,
        }
        (void)conf; /* Thresholds configuration (ignored). */
        assert(desc > MLX5_TX_COMP_THRESH);
-       tmpl.txq.elts_n = desc;
+       tmpl.txq.elts_n = log2above(desc);
        /* MRs will be registered in mp2mr[] later. */
        attr.rd = (struct ibv_exp_res_domain_init_attr){
                .comp_mask = (IBV_EXP_RES_DOMAIN_THREAD_MODEL |