[PATCH 1/1] net/i40e: unset vector flag when scalar path is chosen

[Bruce Richardson]

On Wed, Dec 17, 2025 at 02:54:36PM +0000, Ciara Loftus wrote:
> The tx_vec_allowed flag should be set to false if a scalar Tx path is
> chosen.
> 
> Fixes: 1ff08bb7ad90 ("net/i40e: use common Tx path selection infrastructure")
> 
> Signed-off-by: Ciara Loftus <ciara.loftus at intel.com>
> ---
>  drivers/net/intel/i40e/i40e_rxtx.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/intel/i40e/i40e_rxtx.c b/drivers/net/intel/i40e/i40e_rxtx.c
> index 2db58c6b24..dd859bda4e 100644
> --- a/drivers/net/intel/i40e/i40e_rxtx.c
> +++ b/drivers/net/intel/i40e/i40e_rxtx.c
> @@ -3631,6 +3631,9 @@ i40e_set_tx_function(struct rte_eth_dev *dev)
>  			ad->tx_func_type == I40E_TX_ALTIVEC ||
>  			ad->tx_func_type == I40E_TX_AVX2)
>  		dev->recycle_tx_mbufs_reuse = i40e_recycle_tx_mbufs_reuse_vec;
> +
> +	if (i40e_tx_path_infos[ad->tx_func_type].features.simd_width < RTE_VECT_SIMD_128)
> +		ad->tx_vec_allowed = false;
>  }
>  
Under what circumstances would this be a problem, or under what
circumstances would we have this situaion?

/Bruce