af_packet: support changing the mtu size
Added support to the af_packet device to change the MTU size.
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <dirent.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
@@ -61,7 +64,26 @@ static u32
af_packet_eth_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi,
u32 flags)
{
- /* nothing for now */
+ clib_error_t *error;
+ u8 *s;
+ af_packet_main_t *apm = &af_packet_main;
+ af_packet_if_t *apif =
+ pool_elt_at_index (apm->interfaces, hi->dev_instance);
+
+ if (ETHERNET_INTERFACE_FLAG_MTU == (flags & ETHERNET_INTERFACE_FLAG_MTU))
+ {
+ s = format (0, "/sys/class/net/%s/mtu%c", apif->host_if_name, 0);
+
+ error = vlib_sysfs_write ((char *) s, "%d", hi->max_packet_bytes);
+ vec_free (s);
+
+ if (error)
+ {
+ clib_error_report (error);
+ return VNET_API_ERROR_SYSCALL_ERROR_1;
+ }
+ }
+
return 0;
}
