FW: [PATCH 19.11] ethdev: fix RSS update when RSS is disabled

["Chen, LingliX" <linglix.chen@intel.com>]

> 
> -----Original Message-----
> From: Huisong Li <lihuisong@huawei.com>
> Sent: Tuesday, August 2, 2022 7:30 PM
> To: stable@dpdk.org; christian.ehrhardt@canonical.com
> Cc: liudongdong3@huawei.com; fengchengwen@huawei.com;
> huangdaode@huawei.com; Jiang, YuX <yux.jiang@intel.com>;
> lihuisong@huawei.com
> Subject: [PATCH 19.11] ethdev: fix RSS update when RSS is disabled
> 
> [ upstream commit 93e1ea6dfa99dea359b8d66123576a395c2c0acd ]
> 
> The ETH_MQ_RX_RSS_FLAG flag is a switch to enable RSS. If the flag is not set
> in dev_configure, RSS will be not configured and enabled.
> However, RSS hash and reta can still be configured by ethdev ops to enable RSS
> if the flag isn't set. The behavior is inconsistent.
> 
> Bugzilla ID: 1056
> Fixes: 99a2dd955fba ("lib: remove librte_ prefix from directory names")
> 
> Signed-off-by: Huisong Li <lihuisong@huawei.com>
> Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
> Reviewed-by: Ferruh Yigit <ferruh.yigit@xilinx.com>
> ---
>  lib/librte_ethdev/rte_ethdev.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
> index 76699cc10f..eb82e12ea4 100644
> --- a/lib/librte_ethdev/rte_ethdev.c
> +++ b/lib/librte_ethdev/rte_ethdev.c
> @@ -3504,6 +3504,7 @@ rte_eth_dev_rss_reta_update(uint16_t port_id,
>  			    struct rte_eth_rss_reta_entry64 *reta_conf,
>  			    uint16_t reta_size)
>  {
> +	enum rte_eth_rx_mq_mode mq_mode;
>  	struct rte_eth_dev *dev;
>  	int ret;
> 
> @@ -3521,6 +3522,12 @@ rte_eth_dev_rss_reta_update(uint16_t port_id,
>  	if (ret < 0)
>  		return ret;
> 
> +	mq_mode = dev->data->dev_conf.rxmode.mq_mode;
> +	if (!(mq_mode & ETH_MQ_RX_RSS_FLAG)) {
> +		RTE_ETHDEV_LOG(ERR, "Multi-queue RSS mode isn't enabled.\n");
> +		return -ENOTSUP;
> +	}
> +
>  	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->reta_update, -ENOTSUP);
>  	return eth_err(port_id, (*dev->dev_ops->reta_update)(dev, reta_conf,
>  							     reta_size));
> @@ -3553,6 +3560,7 @@ rte_eth_dev_rss_hash_update(uint16_t port_id,  {
>  	struct rte_eth_dev *dev;
>  	struct rte_eth_dev_info dev_info = { .flow_type_rss_offloads = 0, };
> +	enum rte_eth_rx_mq_mode mq_mode;
>  	int ret;
> 
>  	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV); @@ -3572,6
> +3580,13 @@ rte_eth_dev_rss_hash_update(uint16_t port_id,
>  			dev_info.flow_type_rss_offloads);
>  		return -EINVAL;
>  	}
> +
> +	mq_mode = dev->data->dev_conf.rxmode.mq_mode;
> +	if (!(mq_mode & ETH_MQ_RX_RSS_FLAG)) {
> +		RTE_ETHDEV_LOG(ERR, "Multi-queue RSS mode isn't enabled.\n");
> +		return -ENOTSUP;
> +	}
> +
>  	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->rss_hash_update,
> -ENOTSUP);
>  	return eth_err(port_id, (*dev->dev_ops->rss_hash_update)(dev,
>  								 rss_conf));
> --
> 2.22.0

Tested-by: Lingli Chen <linglix.chen@intel.com>