net/mlx5: fix updating total length of multi-packet send

The total length field in descriptor of inlined multi-packet send must be
updated before closing a session. There's possibility of updating it
afterward. This bug might cause one packet out of MLX5_MPW_DSEG_MAX gets
silently dropped by HW and impact performance, especially lossless test.

Fixes: 230189d9ff22 ("net/mlx5: support multi-packet send")
Cc: stable@dpdk.org
Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
Acked-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>

diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index 40f2c47..88b0354 100644 (file)
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -1106,6 +1106,7 @@ mlx5_tx_burst_mpw_inline(void *dpdk_txq, struct rte_mbuf **pkts,
                                        mpw.data.raw += length;
                        }
                        ++mpw.pkts_n;
+                       mpw.total_len += length;
                        ++j;
                        if (mpw.pkts_n == MLX5_MPW_DSEG_MAX) {
                                mlx5_mpw_inline_close(txq, &mpw);
@@ -1115,7 +1116,6 @@ mlx5_tx_burst_mpw_inline(void *dpdk_txq, struct rte_mbuf **pkts,
                                inline_room -= length;
                        }
                }
-               mpw.total_len += length;
                elts_head = elts_head_next;
 #ifdef MLX5_PMD_SOFT_COUNTERS
                /* Increment sent bytes counter. */