add XDPLua map sample

Author: VictorNogueiraRio

samples/bpf/Makefile

@@ -111,7 +111,7 @@ xdpsock-objs := xdpsock_user.o
 xdp_fwd-objs := xdp_fwd_user.o
 task_fd_query-objs := bpf_load.o task_fd_query_user.o $(TRACE_HELPERS)
 xdp_sample_pkts-objs := xdp_sample_pkts_user.o $(TRACE_HELPERS)
-# CONFIG_XDPLUA
+# CONFIG_XDP_LUA
 xdplua-objs := xdplua_user.o
 
 # Tell kbuild to always build the programs
@@ -170,6 +170,8 @@ always += xdpsock_kern.o
 always += xdp_fwd_kern.o
 always += task_fd_query_kern.o
 always += xdp_sample_pkts_kern.o
+# CONFIG_XDP_LUA
+always += xdplua_map_kern.o
 
 KBUILD_HOSTCFLAGS += -I$(objtree)/usr/include
 KBUILD_HOSTCFLAGS += -I$(srctree)/tools/lib/

samples/bpf/map.lua

@@ -0,0 +1,22 @@
+--
+-- Copyright (C) 2019-2020 Victor Nogueira <[email protected]>
+--
+-- This program is free software; you can redistribute it and/or
+-- modify it under the terms of the GNU General Public License as
+-- published by the Free Software Foundation version 2.
+--
+-- This program is distributed "as is" WITHOUT ANY WARRANTY of any
+-- kind, whether express or implied; without even the implied warranty
+-- of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+xdp = require'xdp'
+
+function lookup(map)
+	local val = xdp.map_lookup(map, 1)
+	print('val', val)
+end
+
+function update(map)
+	xdp.map_update(map, 1, 3)
+end

samples/bpf/xdplua_map_kern.c

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2019-2020 Victor Nogueira <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#define KBUILD_MODNAME "foo"
+#include <uapi/linux/bpf.h>
+#include "bpf_helpers.h"
+
+struct bpf_map_def SEC("maps") test_map = {
+	.type		= BPF_MAP_TYPE_ARRAY,
+	.key_size	= sizeof(int),
+	.value_size	= sizeof(int),
+	.max_entries	= 20,
+};
+
+SEC("xdp_lua_test_map")
+int xdp_lua_test_map_prog(struct xdp_md *ctx)
+{
+	char lookupname[] = "lookup";
+	char updatename[] = "update";
+
+	bpf_lua_setstate(ctx);
+
+	bpf_lua_pushmap(ctx, &test_map);
+	bpf_lua_pcall(ctx, updatename, 1, 0);
+
+	bpf_lua_pushmap(ctx, &test_map);
+	bpf_lua_pcall(ctx, lookupname, 1, 0);
+
+	return XDP_PASS;
+}
+
+char _license[] SEC("license") = "GPL";