[PATCH v3] net/vmxnet3: disable RSS for single queue configuration for ESX8.0+ versions

[Jochen Behrens]

Acked-by: Jochen Behrens <jochen.behrens at broadcom.com>

On 10/23/25 01:30, Amiya Ranjan Mohakud wrote:
> It fixes the issue of v4 RSS configuration failure in
> vmxnet3_v4_rss_configure() while writing to BAR register. It's very
> specific to single queue configuration.
> 
> https://mails.dpdk.org/archives/users/2025-April/008236.html
> 
> Bugzilla ID:1789
> Fixes: 52ec00fd1474e8 ("net/vmxnet3: fix RSS setting on v4")
> Cc: stable at dpdk.org
> 
> v2:
>   - Fixed typo in commit message
> v3:
>   - Checking if RSS is already enabled
> 
> Signed-off-by: Amiya Ranjan Mohakud <amiyaranjan.mohakud at gmail.com>
> ---
>   drivers/net/vmxnet3/vmxnet3_ethdev.c | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/net/vmxnet3/vmxnet3_ethdev.c b/drivers/net/vmxnet3/vmxnet3_ethdev.c
> index f4cdb1bb31..a0306af86c 100644
> --- a/drivers/net/vmxnet3/vmxnet3_ethdev.c
> +++ b/drivers/net/vmxnet3/vmxnet3_ethdev.c
> @@ -534,6 +534,13 @@ vmxnet3_dev_configure(struct rte_eth_dev *dev)
>   
>   	PMD_INIT_FUNC_TRACE();
>   
> +	/* Disabling RSS for single queue pair */
> +	if (dev->data->nb_rx_queues == 1 &&
> +	    dev->data->dev_conf.rxmode.mq_mode == RTE_ETH_MQ_RX_RSS) {
> +		dev->data->dev_conf.rxmode.mq_mode = RTE_ETH_MQ_RX_NONE;
> +		PMD_INIT_LOG(ERR, "WARN: Disabling RSS for single Rx queue");
> +	}
> +
>   	if (dev->data->dev_conf.rxmode.mq_mode & RTE_ETH_MQ_RX_RSS_FLAG)
>   		dev->data->dev_conf.rxmode.offloads |= RTE_ETH_RX_OFFLOAD_RSS_HASH;
>