[PATCH v2 3/7] net/iavf: fix VLAN outer TPID setting on Tx

[Bruce Richardson]

On Thu, Sep 03, 2026 at 03:37:25PM +0100, Bruce Richardson wrote:
> The outer VLAN TPID setting for Tx was cached in the driver but was not
> properly pushed to hardware (via PF) when changed. Add the necessary
> push call to the update function.
> 
> Fixes: 8599d7604e0a ("net/iavf: support QinQ strip")
> Fixes: 7ce1363b424f ("net/iavf: support QinQ insertion")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
> ---
>  drivers/net/intel/iavf/iavf_ethdev.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 

Adding ack from v1:

Acked-by: Ciara Loftus <ciara.loftus at intel.com>

> diff --git a/drivers/net/intel/iavf/iavf_ethdev.c b/drivers/net/intel/iavf/iavf_ethdev.c
> index c4a6763f28..2ac4dbdac4 100644
> --- a/drivers/net/intel/iavf/iavf_ethdev.c
> +++ b/drivers/net/intel/iavf/iavf_ethdev.c
> @@ -1461,13 +1461,20 @@ iavf_vlan_tpid_set(struct rte_eth_dev *dev, enum rte_vlan_type vlan_type, uint16
>  		return -ENOTSUP;
>  	}
>  
> -	/* This API only fills internal iavf_adapter structure
> -	 * and does not send any signal to hardware.
> -	 * Inner VLAN always 0x8100, so not set explicitly.
> -	 */
> +	/* Inner VLAN always 0x8100, so not set explicitly. */
>  	if (qinq && vlan_type == RTE_ETH_VLAN_TYPE_OUTER)
>  		adapter->tpid = tpid; /* Outer VLAN can be 0x88a8 or 0x8100 */
>  
> +	/* Re-push insertion, and stripping if already enabled, so the new
> +	 * outer TPID reaches the PF instead of only being cached here.
> +	 */
> +	iavf_dev_vlan_insert_set(dev);
> +	if (dev_conf->rxmode.offloads & RTE_ETH_RX_OFFLOAD_QINQ_STRIP) {
> +		int ret = iavf_dev_vlan_offload_set(dev, RTE_ETH_QINQ_STRIP_MASK);
> +		if (ret != 0)
> +			return ret;
> +	}
> +
>  	return 0;
>  }
>  
> -- 
> 2.53.0
>