[PATCH v6] pcap: support MTU set for linux interafces

[Stephen Hemminger]

On Wed,  8 Jun 2022 19:04:19 +0300
Ido Goshen <ido at cgstowernetworks.com> wrote:

> +int
> +osdep_iface_mtu_set(const char *if_name, uint16_t mtu)
> +{
> +	struct ifreq ifr;
> +	int if_fd = socket(AF_INET, SOCK_DGRAM, 0);
> +
> +	if (if_fd == -1)
> +		return -1;
> +
> +	rte_strscpy(ifr.ifr_name, if_name, sizeof(ifr.ifr_name));
> +	ifr.ifr_mtu = mtu;
> +	if (ioctl(if_fd, SIOCSIFMTU, &ifr)) {
> +		PMD_LOG(ERR, "%s mtu set to %d failed\n", if_name, mtu);
> +		close(if_fd);
> +		return -1;
> +	}
> +
> +	close(if_fd);
> +	return 0;
> +}

This should work on FreeBSD as well.
FreeBSD has the same ioctl()