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Message-ID: <151707403229.12604.14438582951298495286.stgit@firesoul>
Date: Sat, 27 Jan 2018 18:27:12 +0100
From: Jesper Dangaard Brouer <brouer@...hat.com>
To: netdev@...r.kernel.org, Daniel Borkmann <borkmann@...earbox.net>,
Alexei Starovoitov <alexei.starovoitov@...il.com>,
wangnan0@...wei.com
Cc: acme@...hat.com, joe@....org, jakub.kicinski@...ronome.com,
eric@...it.org, Jesper Dangaard Brouer <brouer@...hat.com>
Subject: [bpf-next PATCH 3/5] tools/libbpf: add test program for loading BPF
ELF files
Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
---
0 files changed
diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index 83714ca1f22b..f968702f4ef6 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -147,11 +147,11 @@ LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
CMD_TARGETS = $(LIB_FILE)
-TARGETS = $(CMD_TARGETS)
+TARGETS = $(CMD_TARGETS) test_libbpf_open
all: fixdep all_cmd
-all_cmd: $(CMD_TARGETS)
+all_cmd: $(TARGETS)
$(BPF_IN): force elfdep bpfdep
@(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
@@ -168,6 +168,9 @@ $(OUTPUT)libbpf.so: $(BPF_IN)
$(OUTPUT)libbpf.a: $(BPF_IN)
$(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
+test_libbpf_open: test_libbpf_open.c $(OUTPUT)libbpf.a
+ $(QUIET_LINK)$(CC) -lelf -Wall $< $(OUTPUT)libbpf.a -o $(OUTPUT)$@
+
define do_install
if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
diff --git a/tools/lib/bpf/test_libbpf_open.c b/tools/lib/bpf/test_libbpf_open.c
new file mode 100644
index 000000000000..8fcd1c076add
--- /dev/null
+++ b/tools/lib/bpf/test_libbpf_open.c
@@ -0,0 +1,150 @@
+/* SPDX-License-Identifier: GPL-2.0
+ * Copyright (c) 2018 Jesper Dangaard Brouer, Red Hat Inc.
+ */
+static const char *__doc__ =
+ "Libbpf test program for loading BPF ELF object files";
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <bpf/libbpf.h>
+#include <getopt.h>
+
+static const struct option long_options[] = {
+ {"help", no_argument, NULL, 'h' },
+ {"debug", no_argument, NULL, 'D' },
+ {"quiet", no_argument, NULL, 'q' },
+ {0, 0, NULL, 0 }
+};
+
+static void usage(char *argv[])
+{
+ int i;
+
+ printf("\nDOCUMENTATION:\n%s\n\n", __doc__);
+ printf(" Usage: %s (options-see-below) BPF_FILE\n", argv[0]);
+ printf(" Listing options:\n");
+ for (i = 0; long_options[i].name != 0; i++) {
+ printf(" --%-12s", long_options[i].name);
+ printf(" short-option: -%c",
+ long_options[i].val);
+ printf("\n");
+ }
+ printf("\n");
+}
+
+#define DEFINE_PRINT_FN(name, enabled) \
+static int libbpf_##name(const char *fmt, ...) \
+{ \
+ va_list args; \
+ int ret; \
+ \
+ va_start(args, fmt); \
+ if (enabled) { \
+ fprintf(stderr, "[" #name "] "); \
+ ret = vfprintf(stderr, fmt, args); \
+ } \
+ va_end(args); \
+ return ret; \
+}
+DEFINE_PRINT_FN(warning, 1)
+DEFINE_PRINT_FN(info, 1)
+DEFINE_PRINT_FN(debug, 1)
+
+#define EXIT_FAIL_LIBBPF EXIT_FAILURE
+#define EXIT_FAIL_OPTION 2
+
+int test_walk_progs(struct bpf_object *obj, bool verbose)
+{
+ struct bpf_program *prog;
+ int cnt = 0;
+
+ bpf_object__for_each_program(prog, obj) {
+ cnt++;
+ if (verbose)
+ printf("Prog (count:%d) section_name: %s\n", cnt,
+ bpf_program__title(prog, false));
+ }
+ return 0;
+}
+
+int test_walk_maps(struct bpf_object *obj, bool verbose)
+{
+ struct bpf_map *map;
+ int cnt = 0;
+
+ bpf_map__for_each(map, obj) {
+ cnt++;
+ if (verbose)
+ printf("Map (count:%d) name: %s\n", cnt,
+ bpf_map__name(map));
+ }
+ return 0;
+}
+
+int test_open_file(char *filename, bool verbose)
+{
+ struct bpf_object *bpfobj = NULL;
+ long err;
+
+ if (verbose)
+ printf("Open BPF ELF-file with libbpf: %s\n", filename);
+
+ /* Load BPF ELF object file and check for errors */
+ bpfobj = bpf_object__open(filename);
+ err = libbpf_get_error(bpfobj);
+ if (err) {
+ char err_buf[128];
+ libbpf_strerror(err, err_buf, sizeof(err_buf));
+ if (verbose)
+ printf("Unable to load eBPF objects in file '%s': %s\n",
+ filename, err_buf);
+ return EXIT_FAIL_LIBBPF;
+ }
+ test_walk_progs(bpfobj, verbose);
+ test_walk_maps(bpfobj, verbose);
+
+ if (verbose)
+ printf("Close BPF ELF-file with libbpf: %s\n",
+ bpf_object__name(bpfobj));
+ bpf_object__close(bpfobj);
+
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ char filename[1024] = { 0 };
+ bool verbose = 1;
+ int longindex = 0;
+ int opt;
+
+ libbpf_set_print(libbpf_warning, libbpf_info, NULL);
+
+ /* Parse commands line args */
+ while ((opt = getopt_long(argc, argv, "hDq",
+ long_options, &longindex)) != -1) {
+ switch (opt) {
+ case 'D':
+ libbpf_set_print(libbpf_warning, libbpf_info,
+ libbpf_debug);
+ break;
+ case 'q': /* Use in scripting mode */
+ verbose = 0;
+ break;
+ case 'h':
+ default:
+ usage(argv);
+ return EXIT_FAIL_OPTION;
+ }
+ }
+ if (optind >= argc) {
+ usage(argv);
+ printf("ERROR: Expected BPF_FILE argument after options\n");
+ return EXIT_FAIL_OPTION;
+ }
+ snprintf(filename, sizeof(filename), "%s", argv[optind]);
+
+ return test_open_file(filename, verbose);
+}
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