[dpdk-dev] [PATCH 1/4] net/mlx5: fix offset calculation of Multi-Packet Rx

[Yongseok Koh]

Offset in a MPRQ buffer must be calculated before updating the stride
index.

Fixes: f0d61f8f8953 ("net/mlx5: add Multi-Packet Rx support")

Signed-off-by: Yongseok Koh <yskoh at mellanox.com>
---
 drivers/net/mlx5/mlx5_rxtx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index d960a73d5..387463792 100644
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -2146,6 +2146,8 @@ mlx5_rx_burst_mprq(void *dpdk_rxq, struct rte_mbuf **pkts, uint16_t pkts_n)
 		consumed_strd = (byte_cnt & MLX5_MPRQ_STRIDE_NUM_MASK) >>
 				MLX5_MPRQ_STRIDE_NUM_SHIFT;
 		assert(consumed_strd);
+		/* Calculate offset before adding up stride index. */
+		offset = strd_idx * strd_sz + strd_shift;
 		strd_idx += consumed_strd;
 		if (byte_cnt & MLX5_MPRQ_FILLER_MASK)
 			continue;
@@ -2169,7 +2171,6 @@ mlx5_rx_burst_mprq(void *dpdk_rxq, struct rte_mbuf **pkts, uint16_t pkts_n)
 		assert((int)len >= (rxq->crc_present << 2));
 		if (rxq->crc_present)
 			len -= ETHER_CRC_LEN;
-		offset = strd_idx * strd_sz + strd_shift;
 		addr = RTE_PTR_ADD(mlx5_mprq_buf_addr(buf), offset);
 		/* Initialize the offload flag. */
 		pkt->ol_flags = 0;
-- 
2.11.0