display_port_reg_value(port_id, reg_off, reg_v);
}
+static uint32_t
+eth_dev_get_overhead_len(uint32_t max_rx_pktlen, uint16_t max_mtu)
+{
+ uint32_t overhead_len;
+
+ if (max_mtu != UINT16_MAX && max_rx_pktlen > max_mtu)
+ overhead_len = max_rx_pktlen - max_mtu;
+ else
+ overhead_len = RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN;
+
+ return overhead_len;
+}
+
+static int
+eth_dev_validate_mtu(uint16_t port_id, uint16_t mtu)
+{
+ struct rte_eth_dev_info dev_info;
+ uint32_t overhead_len;
+ uint32_t frame_size;
+ int ret;
+
+ ret = rte_eth_dev_info_get(port_id, &dev_info);
+ if (ret != 0)
+ return ret;
+
+ if (mtu < dev_info.min_mtu) {
+ fprintf(stderr,
+ "MTU (%u) < device min MTU (%u) for port_id %u\n",
+ mtu, dev_info.min_mtu, port_id);
+ return -EINVAL;
+ }
+ if (mtu > dev_info.max_mtu) {
+ fprintf(stderr,
+ "MTU (%u) > device max MTU (%u) for port_id %u\n",
+ mtu, dev_info.max_mtu, port_id);
+ return -EINVAL;
+ }
+
+ overhead_len = eth_dev_get_overhead_len(dev_info.max_rx_pktlen,
+ dev_info.max_mtu);
+ frame_size = mtu + overhead_len;
+ if (frame_size > dev_info.max_rx_pktlen) {
+ fprintf(stderr,
+ "Frame size (%u) > device max frame size (%u) for port_id %u\n",
+ frame_size, dev_info.max_rx_pktlen, port_id);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
void
port_mtu_set(portid_t port_id, uint16_t mtu)
{
if (port_id_is_invalid(port_id, ENABLED_WARN))
return;
+ diag = eth_dev_validate_mtu(port_id, mtu);
+ if (diag != 0)
+ return;
+
if (port->need_reconfig == 0) {
diag = rte_eth_dev_set_mtu(port_id, mtu);
if (diag != 0) {