net: l2: dummy: Update sent statistics

Update dummy interface sent statistics as that was missing.

Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>

subsys/net/l2/dummy/CMakeLists.txt

@@ -5,6 +5,8 @@ zephyr_library_compile_definitions_ifdef(
   CONFIG_NEWLIB_LIBC __LINUX_ERRNO_EXTENSIONS__
   )
 
+zephyr_library_include_directories(. ${ZEPHYR_BASE}/subsys/net/ip)
+
 zephyr_library_sources_ifdef(CONFIG_NET_L2_DUMMY    dummy.c)
 
 if(CONFIG_NET_PSEUDO_IFACE)

subsys/net/l2/dummy/dummy.c

@@ -14,6 +14,8 @@ LOG_MODULE_REGISTER(net_l2_dummy, LOG_LEVEL_NONE);
 
 #include <zephyr/net/dummy.h>
 
+#include "net_stats.h"
+
 static inline enum net_verdict dummy_recv(struct net_if *iface,
 					  struct net_pkt *pkt)
 {
@@ -41,7 +43,14 @@ static inline int dummy_send(struct net_if *iface, struct net_pkt *pkt)
 
 	ret = net_l2_send(api->send, net_if_get_device(iface), iface, pkt);
 	if (!ret) {
-		ret = net_pkt_get_len(pkt);
+		size_t pkt_len = net_pkt_get_len(pkt);
+
+		if (IS_ENABLED(CONFIG_NET_STATISTICS)) {
+			NET_DBG("Sending pkt %p len %zu", pkt, pkt_len);
+			net_stats_update_bytes_sent(iface, pkt_len);
+		}
+
+		ret = (int)pkt_len;
 		net_pkt_unref(pkt);
 	}