selftests/bpf: Test bpf_link's get_next_id, get_fd_by_id, and get_obj_info (2c2837b0) · Commits · 戴 / test

tools/testing/selftests/bpf/prog_tests/bpf_obj_id.c

+101 −9

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		#include <test_progs.h>

		#define nr_iters 2

		void test_bpf_obj_id(void)
		{
		const __u64 array_magic_value = 0xfaceb00c;
		const __u32 array_key = 0;
		const int nr_iters = 2;
		const char *file = "./test_obj_id.o";
		const char *expected_prog_name = "test_obj_id";
		const char *expected_map_name = "test_map_id";
		const __u64 nsec_per_sec = 1000000000;

		struct bpf_object *objs[nr_iters];
		struct bpf_object *objs[nr_iters] = {};
		struct bpf_link *links[nr_iters] = {};
		struct bpf_program *prog;
		int prog_fds[nr_iters], map_fds[nr_iters];
		/* +1 to test for the info_len returned by kernel */
		struct bpf_prog_info prog_infos[nr_iters + 1];
		struct bpf_map_info map_infos[nr_iters + 1];
		struct bpf_link_info link_infos[nr_iters + 1];
		/* Each prog only uses one map. +1 to test nr_map_ids
		* returned by kernel.
		*/
		__u32 map_ids[nr_iters + 1];
		char jited_insns[128], xlated_insns[128], zeros[128];
		char jited_insns[128], xlated_insns[128], zeros[128], tp_name[128];
		__u32 i, next_id, info_len, nr_id_found, duration = 0;
		struct timespec real_time_ts, boot_time_ts;
		int err = 0;
		@@ -36,14 +40,15 @@ void test_bpf_obj_id(void)
		CHECK(err >= 0 \|\| errno != ENOENT,
		"get-fd-by-notexist-map-id", "err %d errno %d\n", err, errno);

		for (i = 0; i < nr_iters; i++)
		objs[i] = NULL;
		err = bpf_link_get_fd_by_id(0);
		CHECK(err >= 0 \|\| errno != ENOENT,
		"get-fd-by-notexist-link-id", "err %d errno %d\n", err, errno);

		/* Check bpf_obj_get_info_by_fd() */
		bzero(zeros, sizeof(zeros));
		for (i = 0; i < nr_iters; i++) {
		now = time(NULL);
		err = bpf_prog_load(file, BPF_PROG_TYPE_SOCKET_FILTER,
		err = bpf_prog_load(file, BPF_PROG_TYPE_RAW_TRACEPOINT,
		&objs[i], &prog_fds[i]);
		/* test_obj_id.o is a dumb prog. It should never fail
		* to load.
		@@ -60,6 +65,17 @@ void test_bpf_obj_id(void)
		if (CHECK_FAIL(err))
		goto done;

		prog = bpf_object__find_program_by_title(objs[i],
		"raw_tp/sys_enter");
		if (CHECK_FAIL(!prog))
		goto done;
		links[i] = bpf_program__attach(prog);
		err = libbpf_get_error(links[i]);
		if (CHECK(err, "prog_attach", "prog #%d, err %d\n", i, err)) {
		links[i] = NULL;
		goto done;
		}

		/* Check getting map info */
		info_len = sizeof(struct bpf_map_info) * 2;
		bzero(&map_infos[i], info_len);
		@@ -107,7 +123,7 @@ void test_bpf_obj_id(void)
		load_time = (real_time_ts.tv_sec - boot_time_ts.tv_sec)
		+ (prog_infos[i].load_time / nsec_per_sec);
		if (CHECK(err \|\|
		prog_infos[i].type != BPF_PROG_TYPE_SOCKET_FILTER \|\|
		prog_infos[i].type != BPF_PROG_TYPE_RAW_TRACEPOINT \|\|
		info_len != sizeof(struct bpf_prog_info) \|\|
		(env.jit_enabled && !prog_infos[i].jited_prog_len) \|\|
		(env.jit_enabled &&
		@@ -120,7 +136,11 @@ void test_bpf_obj_id(void)
		(int )(long)prog_infos[i].map_ids != map_infos[i].id \|\|
		strcmp((char *)prog_infos[i].name, expected_prog_name),
		"get-prog-info(fd)",
		"err %d errno %d i %d type %d(%d) info_len %u(%zu) jit_enabled %d jited_prog_len %u xlated_prog_len %u jited_prog %d xlated_prog %d load_time %lu(%lu) uid %u(%u) nr_map_ids %u(%u) map_id %u(%u) name %s(%s)\n",
		"err %d errno %d i %d type %d(%d) info_len %u(%zu) "
		"jit_enabled %d jited_prog_len %u xlated_prog_len %u "
		"jited_prog %d xlated_prog %d load_time %lu(%lu) "
		"uid %u(%u) nr_map_ids %u(%u) map_id %u(%u) "
		"name %s(%s)\n",
		err, errno, i,
		prog_infos[i].type, BPF_PROG_TYPE_SOCKET_FILTER,
		info_len, sizeof(struct bpf_prog_info),
		@@ -135,6 +155,33 @@ void test_bpf_obj_id(void)
		(int )(long)prog_infos[i].map_ids, map_infos[i].id,
		prog_infos[i].name, expected_prog_name))
		goto done;

		/* Check getting link info */
		info_len = sizeof(struct bpf_link_info) * 2;
		bzero(&link_infos[i], info_len);
		link_infos[i].raw_tracepoint.tp_name = (__u64)&tp_name;
		link_infos[i].raw_tracepoint.tp_name_len = sizeof(tp_name);
		err = bpf_obj_get_info_by_fd(bpf_link__fd(links[i]),
		&link_infos[i], &info_len);
		if (CHECK(err \|\|
		link_infos[i].type != BPF_LINK_TYPE_RAW_TRACEPOINT \|\|
		link_infos[i].prog_id != prog_infos[i].id \|\|
		link_infos[i].raw_tracepoint.tp_name != (__u64)&tp_name \|\|
		strcmp((char *)link_infos[i].raw_tracepoint.tp_name,
		"sys_enter") \|\|
		info_len != sizeof(struct bpf_link_info),
		"get-link-info(fd)",
		"err %d errno %d info_len %u(%zu) type %d(%d) id %d "
		"prog_id %d (%d) tp_name %s(%s)\n",
		err, errno,
		info_len, sizeof(struct bpf_link_info),
		link_infos[i].type, BPF_LINK_TYPE_RAW_TRACEPOINT,
		link_infos[i].id,
		link_infos[i].prog_id, prog_infos[i].id,
		(char *)link_infos[i].raw_tracepoint.tp_name,
		"sys_enter"))
		goto done;

		}

		/* Check bpf_prog_get_next_id() */
		@@ -247,7 +294,52 @@ void test_bpf_obj_id(void)
		"nr_id_found %u(%u)\n",
		nr_id_found, nr_iters);

		done:
		/* Check bpf_link_get_next_id() */
		nr_id_found = 0;
		next_id = 0;
		while (!bpf_link_get_next_id(next_id, &next_id)) {
		struct bpf_link_info link_info;
		int link_fd, cmp_res;

		info_len = sizeof(link_info);
		memset(&link_info, 0, info_len);

		link_fd = bpf_link_get_fd_by_id(next_id);
		if (link_fd < 0 && errno == ENOENT)
		/* The bpf_link is in the dead row */
		continue;
		if (CHECK(link_fd < 0, "get-link-fd(next_id)",
		"link_fd %d next_id %u errno %d\n",
		link_fd, next_id, errno))
		break;

		for (i = 0; i < nr_iters; i++)
		if (link_infos[i].id == next_id)
		break;

		if (i == nr_iters)
		continue;

		nr_id_found++;

		err = bpf_obj_get_info_by_fd(link_fd, &link_info, &info_len);
		cmp_res = memcmp(&link_info, &link_infos[i],
		offsetof(struct bpf_link_info, raw_tracepoint));
		CHECK(err \|\| info_len != sizeof(link_info) \|\| cmp_res,
		"check get-link-info(next_id->fd)",
		"err %d errno %d info_len %u(%zu) memcmp %d\n",
		err, errno, info_len, sizeof(struct bpf_link_info),
		cmp_res);

		close(link_fd);
		}
		CHECK(nr_id_found != nr_iters,
		"check total link id found by get_next_id",
		"nr_id_found %u(%u)\n", nr_id_found, nr_iters);

		done:
		for (i = 0; i < nr_iters; i++) {
		bpf_link__destroy(links[i]);
		bpf_object__close(objs[i]);
		}
		}

tools/testing/selftests/bpf/progs/test_obj_id.c

+3 −11

Original line number	Diff line number	Diff line
		@@ -3,16 +3,8 @@
		*/
		#include <stddef.h>
		#include <linux/bpf.h>
		#include <linux/pkt_cls.h>
		#include <bpf/bpf_helpers.h>

		/* It is a dumb bpf program such that it must have no
		* issue to be loaded since testing the verifier is
		* not the focus here.
		*/

		int _version SEC("version") = 1;

		struct {
		__uint(type, BPF_MAP_TYPE_ARRAY);
		__uint(max_entries, 1);
		@@ -20,13 +12,13 @@ struct {
		__type(value, __u64);
		} test_map_id SEC(".maps");

		SEC("test_obj_id_dummy")
		int test_obj_id(struct __sk_buff *skb)
		SEC("raw_tp/sys_enter")
		int test_obj_id(void *ctx)
		{
		__u32 key = 0;
		__u64 *value;

		value = bpf_map_lookup_elem(&test_map_id, &key);

		return TC_ACT_OK;
		return 0;
		}

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