[PATCH] net/mlx5: fix port initialization with small LRO

[Gregory Etelson]

If application provided maximal LRO size was less than expected PMD
minimum, the PMD either crashed with assert, if asserts were enabled,
or proceeded with port initialization to set port private maximal
LRO size below supported minimum.

The patch terminates port start if LRO size
does not match PMD requirements and TCP LRO offload was requested
at least for one Rx queue.

Fixes: 50c00baff763 ("net/mlx5: limit LRO size to maximum Rx packet")

Cc: stable at dpdk.org

Signed-off-by: Gregory Etelson <getelson at nvidia.com>
Acked-by: Matan Azrad <matan at nvidia.com>
---
 drivers/net/mlx5/mlx5_rxq.c     |  1 -
 drivers/net/mlx5/mlx5_trigger.c | 16 ++++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c
index 0d9d11680b..724cd6c7e6 100644
--- a/drivers/net/mlx5/mlx5_rxq.c
+++ b/drivers/net/mlx5/mlx5_rxq.c
@@ -1533,7 +1533,6 @@ mlx5_max_lro_msg_size_adjust(struct rte_eth_dev *dev, uint16_t idx,
 	    MLX5_MAX_TCP_HDR_OFFSET)
 		max_lro_size -= MLX5_MAX_TCP_HDR_OFFSET;
 	max_lro_size = RTE_MIN(max_lro_size, MLX5_MAX_LRO_SIZE);
-	MLX5_ASSERT(max_lro_size >= MLX5_LRO_SEG_CHUNK_SIZE);
 	max_lro_size /= MLX5_LRO_SEG_CHUNK_SIZE;
 	if (priv->max_lro_msg_size)
 		priv->max_lro_msg_size =
diff --git a/drivers/net/mlx5/mlx5_trigger.c b/drivers/net/mlx5/mlx5_trigger.c
index 4b821a1076..71089299b8 100644
--- a/drivers/net/mlx5/mlx5_trigger.c
+++ b/drivers/net/mlx5/mlx5_trigger.c
@@ -1167,6 +1167,22 @@ mlx5_dev_start(struct rte_eth_dev *dev)
 	else
 		rte_net_mlx5_dynf_inline_mask = 0;
 	if (dev->data->nb_rx_queues > 0) {
+		uint32_t max_lro_msg_size = priv->max_lro_msg_size;
+
+		if (max_lro_msg_size < MLX5_LRO_SEG_CHUNK_SIZE) {
+			uint32_t i;
+			struct mlx5_rxq_priv *rxq;
+
+			for (i = 0; i != priv->rxqs_n; ++i) {
+				rxq = mlx5_rxq_get(dev, i);
+				if (rxq && rxq->ctrl && rxq->ctrl->rxq.lro) {
+					DRV_LOG(ERR, "port %u invalid max LRO size",
+						dev->data->port_id);
+					rte_errno = EINVAL;
+					return -rte_errno;
+				}
+			}
+		}
 		ret = mlx5_dev_configure_rss_reta(dev);
 		if (ret) {
 			DRV_LOG(ERR, "port %u reta config failed: %s",
-- 
2.34.1