net/ethernet: fix compilation issues

fix compilation issues

Signed-off-by: gaohedong <gaohedong@xiaomi.com>

Author: HedongGao

net/inet/inet_sockif.c

@@ -721,12 +721,14 @@ static int inet_get_socketlevel_option(FAR struct socket *psock, int option,
               return -EINVAL;
             }
 
+#  ifdef NET_UDP_HAVE_STACK
           if (psock->s_type == SOCK_DGRAM)
             {
               FAR struct udp_conn_s *conn = psock->s_conn;
               *(FAR int *)value = (conn->timestamp != 0);
             }
           else
+#  endif
             {
               return -ENOPROTOOPT;
             }
@@ -1023,6 +1025,7 @@ static int inet_set_socketlevel_option(FAR struct socket *psock, int option,
               return -EINVAL;
             }
 
+#  ifdef NET_UDP_HAVE_STACK
           if (psock->s_type == SOCK_DGRAM)
             {
               conn_lock(psock->s_conn);
@@ -1038,6 +1041,7 @@ static int inet_set_socketlevel_option(FAR struct socket *psock, int option,
               conn_unlock(psock->s_conn);
             }
           else
+#  endif
             {
               return -ENOPROTOOPT;
             }

net/pkt/Kconfig

@@ -9,6 +9,7 @@ config NET_PKT
 	bool "Socket packet socket support"
 	default n
 	select NETDEV_IFINDEX
+	select NET_READAHEAD
 	---help---
 		Enable or disable support for packet sockets.