On 2016/09/27 23:23, Mintz, Yuval wrote:
>> +/* return envelope header length */
>> +static inline int netif_get_env_hdr_len(struct net_device *dev) {
>> +if (dev->netdev_ops->ndo_set_env_hdr_len)
>> +return dev->env_hdr_len;
>> +
>> +if (netif_reduces_vlan_mtu(dev))
>> +
> +/* return envelope header length */
> +static inline int netif_get_env_hdr_len(struct net_device *dev) {
> + if (dev->netdev_ops->ndo_set_env_hdr_len)
> + return dev->env_hdr_len;
> +
> + if (netif_reduces_vlan_mtu(dev))
> + return 0;
> +
> + return 4; /* VLAN
Currently most NICs support Q-tagged frames[1], i.e. 1522 bytes frames
to handle 4 bytes VLAN header. But some encapsulation protocols like
802.1ad requires them to handle larger frames.
This change introduces dev_set_env_hdr_len() and corresponding drivers'
operation .ndo_set_env_hdr_len(), which
