[PATCH 20.11 v2] net/mlx5: fix LRO validation in Rx setup

[Michael Baum <michaelba@nvidia.com>]

[ upstream commit a213b8682117711c8e92475c5bbb321a3d8428dd ]

The mlx5_rx_queue_setup() get LRO offload from user.

When LRO is configured, the LRO flag in rxq_data is set to 1.

This patch adds validation to make sure the LRO is supported.

Fixes: 17ed314 ("net/mlx5: allow LRO per Rx queue")

Signed-off-by: Michael Baum <michaelba@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>
---

v2: fix compilation issue.

 drivers/net/mlx5/mlx5_rxq.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c
index 4a263a5803..cb743a773c 100644
--- a/drivers/net/mlx5/mlx5_rxq.c
+++ b/drivers/net/mlx5/mlx5_rxq.c
@@ -754,8 +754,18 @@ mlx5_rx_queue_setup(struct rte_eth_dev *dev, uint16_t idx, uint16_t desc,
 				(struct rte_eth_rxseg_split *)conf->rx_seg;
 	struct rte_eth_rxseg_split rx_single = {.mp = mp};
 	uint16_t n_seg = conf->rx_nseg;
+	uint64_t offloads = conf->offloads |
+			    dev->data->dev_conf.rxmode.offloads;
 	int res;
 
+	if ((offloads & DEV_RX_OFFLOAD_TCP_LRO) &&
+	    !priv->config.lro.supported) {
+		DRV_LOG(ERR,
+			"Port %u queue %u LRO is configured but not supported.",
+			dev->data->port_id, idx);
+		rte_errno = EINVAL;
+		return -rte_errno;
+	}
 	if (mp) {
 		/*
 		 * The parameters should be checked on rte_eth_dev layer.
@@ -766,9 +776,6 @@ mlx5_rx_queue_setup(struct rte_eth_dev *dev, uint16_t idx, uint16_t desc,
 		n_seg = 1;
 	}
 	if (n_seg > 1) {
-		uint64_t offloads = conf->offloads |
-				    dev->data->dev_conf.rxmode.offloads;
-
 		/* The offloads should be checked on rte_eth_dev layer. */
 		MLX5_ASSERT(offloads & DEV_RX_OFFLOAD_SCATTER);
 		if (!(offloads & RTE_ETH_RX_OFFLOAD_BUFFER_SPLIT)) {
-- 
2.25.1