+static clib_error_t *
+dpdk_set_mtu (vnet_main_t *vnm, vnet_hw_interface_t *hi, u32 mtu)
+{
+ dpdk_main_t *dm = &dpdk_main;
+ dpdk_device_t *xd = vec_elt_at_index (dm->devices, hi->dev_instance);
+ int rv;
+
+ rv = rte_eth_dev_set_mtu (xd->port_id, mtu);
+
+ if (rv < 0)
+ {
+ dpdk_log_err ("[%u] rte_eth_dev_set_mtu failed (mtu %u, rv %d)",
+ xd->port_id, mtu, rv);
+ switch (rv)
+ {
+ case -ENOTSUP:
+ return vnet_error (VNET_ERR_UNSUPPORTED,
+ "dpdk driver doesn't support MTU change");
+ case -EBUSY:
+ return vnet_error (VNET_ERR_BUSY, "port is running");
+ case -EINVAL:
+ return vnet_error (VNET_ERR_INVALID_VALUE, "invalid MTU");
+ default:
+ return vnet_error (VNET_ERR_BUG,
+ "unexpected return value %d returned from "
+ "rte_eth_dev_set_mtu(...)",
+ rv);
+ }
+ }
+ else
+ dpdk_log_debug ("[%u] mtu set to %u", xd->port_id, mtu);
+
+ return 0;
+}
+