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

[Xueming(Steven) Li]

Hey Michael,

Applied, thanks!

> -----Original Message-----
> From: Michael Baum <michaelba at nvidia.com>
> Sent: Tuesday, June 28, 2022 11:34 PM
> To: stable at dpdk.org
> Cc: Matan Azrad <matan at nvidia.com>; Slava Ovsiienko <viacheslavo at nvidia.com>; Xueming(Steven) Li <xuemingl at nvidia.com>
> Subject: [PATCH 20.11 v2] net/mlx5: fix LRO validation in Rx setup
> 
> [ 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 at nvidia.com>
> Acked-by: Matan Azrad <matan at 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