Vlan Device Drivers

include/nuttx/net/vlan.h. All structures and APIs needed to work with Vlan drivers are provided in this header file.
we also create VLAN devices for managing VLAN, which will become interfaces like eth0.58
QinQ is also supported, we can create VLAN devices above another VLAN devices, like eth0.100.101 (or even eth0.1.2.3.4, also supported on Linux).
Supporting ADD_VLAN_CMD and DEL_VLAN_CMD of SIOCSIFVLAN.
We add default PCP because some of our apps may not want to set PCP manually

include/nuttx/net/ethernet.h. Some definitions for 802.1Q VLAN

#define VLAN_PRIO_MASK   0xe000 /* Priority Code Point */
#define VLAN_PRIO_SHIFT  13
#define VLAN_CFI_MASK    0x1000 /* Canonical Format Indicator / Drop Eligible Indicator */
#define VLAN_VID_MASK    0x0fff /* VLAN Identifier */
#define VLAN_N_VID       4096

Driver: drivers/net/vlan.c

Configuration Options

CONFIG_NET_VLAN: Enable 802.1Q VLAN interface support.
CONFIG_NET_VLAN_COUNT: Maximum number of VLAN interfaces per physical Ethernet interface.

Usage

#include <nuttx/net/vlan.h>
#include "netutils/netlib.h"

/* Create a VLAN interface (eth0.100, VLAN ID 100) */

FAR const char *ifname = "eth0";
uint16_t vlanid = 100;
uint8_t priority = 0; /* Default PCP */

int sockfd = socket(NET_SOCK_FAMILY, NET_SOCK_TYPE, NET_SOCK_PROTOCOL);

if (sockfd >= 0)
 {
    struct vlan_ioctl_args ifv;

    strncpy(ifv.vlan_devname, ifname, sizeof(ifv.device1));
    ifv.u.VID  = vlanid;
    ifv.vlan_qos = priority;
    ifv.cmd = ADD_VLAN_CMD;
    if (ioctl(sockfd, SIOCSIFVLAN, (unsigned long)&ifv) < 0)
      {
        /* Handle error */
      }
    close(sockfd);
 }

/* Enable the VLAN interface */

netdev_ifup("eth0.100");

#include <nuttx/net/vlan.h>
#include "netutils/netlib.h"

/* Delete a VLAN interface (eth0.100, VLAN ID 100) */

FAR const char *ifname = "eth0.100";

int sockfd = socket(NET_SOCK_FAMILY, NET_SOCK_TYPE, NET_SOCK_PROTOCOL);

if (sockfd >= 0)
 {
    struct vlan_ioctl_args ifv;

    strncpy(ifv.vlan_devname, ifname, sizeof(ifv.device1));
    ifv.cmd = DEL_VLAN_CMD;
    if (ioctl(sockfd, SIOCSIFVLAN, (unsigned long)&ifv) < 0)
      {
        /* Handle error */
      }
    close(sockfd);
 }