MR btree len is a constant during Rx replenish.
Moved retrieve of the value out of loop to reduce data loads.
Slight performance uplift was measured on N1SDP.
Signed-off-by: Ruifeng Wang <ruifeng.w...@arm.com>
---
drivers/net/mlx5/mlx5_rxtx_vec.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/net/mlx5/mlx5_rxtx_vec.c b/drivers/net/mlx5/mlx5_rxtx_vec.c
index d5af2d91ff..fc7e2a7f41 100644
--- a/drivers/net/mlx5/mlx5_rxtx_vec.c
+++ b/drivers/net/mlx5/mlx5_rxtx_vec.c
@@ -95,6 +95,7 @@ mlx5_rx_replenish_bulk_mbuf(struct mlx5_rxq_data *rxq)
volatile struct mlx5_wqe_data_seg *wq =
&((volatile struct mlx5_wqe_data_seg *)rxq->wqes)[elts_idx];
unsigned int i;
+ uint16_t btree_len;
if (n >= rxq->rq_repl_thresh) {
MLX5_ASSERT(n >= MLX5_VPMD_RXQ_RPLNSH_THRESH(q_n));
@@ -106,6 +107,8 @@ mlx5_rx_replenish_bulk_mbuf(struct mlx5_rxq_data *rxq)
rxq->stats.rx_nombuf += n;
return;
}
+
+ btree_len = mlx5_mr_btree_len(&rxq->mr_ctrl.cache_bh);
for (i = 0; i < n; ++i) {
void *buf_addr;
@@ -119,8 +122,7 @@ mlx5_rx_replenish_bulk_mbuf(struct mlx5_rxq_data *rxq)
wq[i].addr = rte_cpu_to_be_64((uintptr_t)buf_addr +
RTE_PKTMBUF_HEADROOM);
/* If there's a single MR, no need to replace LKey. */
- if (unlikely(mlx5_mr_btree_len(&rxq->mr_ctrl.cache_bh)
- > 1))
+ if (unlikely(btree_len > 1))
wq[i].lkey = mlx5_rx_mb2mr(rxq, elts[i]);
}
rxq->rq_ci += n;
--
2.25.1
