wrtd-rt-common.h: add an option to use VLAN

For #11

software/firmware/include/wrtd-rt-common.h

@@ -23,6 +23,7 @@
  * #define WRTD_NET_TX x    //  1 if transmit events to the network
  * #define WRTD_LOCAL_RX x  //  1 if consume events
  * #define WRTD_LOCAL_TX x  //  1 if generate events
+ * #define WRTD_NET_VLAN    //  Define to tag tx frames (with vlan 0)
  * #include "wrtd-rt-common.h"
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
@@ -465,6 +466,11 @@ static void wrtd_log_discard(struct wrtd_rule *rule,
 }
 
 #if WRTD_NET_TX > 0
+#ifdef WRTD_NET_VLAN
+#define FILTER_TX (TRTL_EP_FILTER_VLAN)
+#else
+#define FILTER_TX 0
+#endif
 static void wrtd_init_tx(void)
 {
         static const struct trtl_ep_eth_address addr = {
@@ -474,7 +480,7 @@ static void wrtd_init_tx(void)
                 .dst_port = WRTD_UDP_PORT,
                 .src_port = WRTD_UDP_PORT,
                 .ethertype = 0x800, /* IPv4 */
-                .filter = 0 /* only the TX path of the endpoint is used */
+                .filter = FILTER_TX
         };
         rmq_bind_out(WRTD_RMQ, TRTL_EP_ETH, &addr);
 }
@@ -688,6 +694,11 @@ static void wrtd_route_in(struct wrtd_event *ev)
 #endif
 
 #if WRTD_NET_RX > 0
+#ifdef WRTD_NET_VLAN
+#define FILTER_RX (TRTL_EP_FILTER_VLAN_DIS)
+#else
+#define FILTER_RX 0
+#endif
 static void wrtd_init_rx(void)
 {
         static const struct trtl_ep_eth_address addr = {
@@ -699,6 +710,7 @@ static void wrtd_init_rx(void)
                            | TRTL_EP_FILTER_DST_PORT
                            | TRTL_EP_FILTER_ETHERTYPE
                            | TRTL_EP_FILTER_DST_IP
+                           | FILTER_RX
                            | TRTL_EP_FILTER_ENABLE)
         };
         rmq_bind_in(WRTD_RMQ, TRTL_EP_ETH, &addr);