[PATCH v5 5/8] net/gve: add support for MTU setting

[Ferruh Yigit]

On 10/10/2022 11:17 AM, Junfeng Guo wrote:

> 
> Support dev_ops mtu_set.
> 
> Signed-off-by: Xiaoyun Li <xiaoyun.li at intel.com>
> Signed-off-by: Junfeng Guo <junfeng.guo at intel.com>

<...>

> 
> +static int
> +gve_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
> +{
> +       struct gve_priv *priv = dev->data->dev_private;
> +       int err;
> +
> +       if (mtu < RTE_ETHER_MIN_MTU || mtu > priv->max_mtu) {
> +               PMD_DRV_LOG(ERR, "MIN MTU is %u MAX MTU is %u", RTE_ETHER_MIN_MTU, priv->max_mtu);
> +               return -EINVAL;
> +       }
> +
> +       /* mtu setting is forbidden if port is start */
> +       if (dev->data->dev_started) {
> +               PMD_DRV_LOG(ERR, "Port must be stopped before configuration");
> +               return -EBUSY;
> +       }
> +
> +       dev->data->dev_conf.rxmode.mtu = mtu + RTE_ETHER_HDR_LEN;

it is 'dev->data->mtu' that holds latest MTU value.

'dev_conf.rxmode.mtu' is the config requested from user, no need to 
update that.

And since 'dev->data->mtu' already updated by 'rte_eth_dev_set_mtu()', 
can drop above line.