selftests/bpf: Add BPF_TYPE_MAP_ARRAY mmap() tests (5051b384) · Commits · 戴 / test

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

+27 −18

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		#include <test_progs.h>
		#include "progs/core_reloc_types.h"
		#include <sys/mman.h>

		#define STRUCT_TO_CHAR_PTR(struct_name) (const char *)&(struct struct_name)

		@@ -453,8 +454,15 @@ struct data {
		char out[256];
		};

		static size_t roundup_page(size_t sz)
		{
		long page_size = sysconf(_SC_PAGE_SIZE);
		return (sz + page_size - 1) / page_size * page_size;
		}

		void test_core_reloc(void)
		{
		const size_t mmap_sz = roundup_page(sizeof(struct data));
		struct bpf_object_load_attr load_attr = {};
		struct core_reloc_test_case *test_case;
		const char tp_name, probe_name;
		@@ -463,8 +471,8 @@ void test_core_reloc(void)
		struct bpf_map *data_map;
		struct bpf_program *prog;
		struct bpf_object *obj;
		const int zero = 0;
		struct data data;
		struct data *data;
		void *mmap_data = NULL;

		for (i = 0; i < ARRAY_SIZE(test_cases); i++) {
		test_case = &test_cases[i];
		@@ -476,8 +484,7 @@ void test_core_reloc(void)
		);

		obj = bpf_object__open_file(test_case->bpf_obj_file, &opts);
		if (CHECK(IS_ERR_OR_NULL(obj), "obj_open",
		"failed to open '%s': %ld\n",
		if (CHECK(IS_ERR(obj), "obj_open", "failed to open '%s': %ld\n",
		test_case->bpf_obj_file, PTR_ERR(obj)))
		continue;

		@@ -519,24 +526,22 @@ void test_core_reloc(void)
		if (CHECK(!data_map, "find_data_map", "data map not found\n"))
		goto cleanup;

		memset(&data, 0, sizeof(data));
		memcpy(data.in, test_case->input, test_case->input_len);

		err = bpf_map_update_elem(bpf_map__fd(data_map),
		&zero, &data, 0);
		if (CHECK(err, "update_data_map",
		"failed to update .data map: %d\n", err))
		mmap_data = mmap(NULL, mmap_sz, PROT_READ \| PROT_WRITE,
		MAP_SHARED, bpf_map__fd(data_map), 0);
		if (CHECK(mmap_data == MAP_FAILED, "mmap",
		".bss mmap failed: %d", errno)) {
		mmap_data = NULL;
		goto cleanup;
		}
		data = mmap_data;

		memset(mmap_data, 0, sizeof(*data));
		memcpy(data->in, test_case->input, test_case->input_len);

		/* trigger test run */
		usleep(1);

		err = bpf_map_lookup_elem(bpf_map__fd(data_map), &zero, &data);
		if (CHECK(err, "get_result",
		"failed to get output data: %d\n", err))
		goto cleanup;

		equal = memcmp(data.out, test_case->output,
		equal = memcmp(data->out, test_case->output,
		test_case->output_len) == 0;
		if (CHECK(!equal, "check_result",
		"input/output data don't match\n")) {
		@@ -548,12 +553,16 @@ void test_core_reloc(void)
		}
		for (j = 0; j < test_case->output_len; j++) {
		printf("output byte #%d: EXP 0x%02hhx GOT 0x%02hhx\n",
		j, test_case->output[j], data.out[j]);
		j, test_case->output[j], data->out[j]);
		}
		goto cleanup;
		}

		cleanup:
		if (mmap_data) {
		CHECK_FAIL(munmap(mmap_data, mmap_sz));
		mmap_data = NULL;
		}
		if (!IS_ERR_OR_NULL(link)) {
		bpf_link__destroy(link);
		link = NULL;

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

0 → 100644

+220 −0

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

		struct map_data {
		__u64 val[512 * 4];
		};

		struct bss_data {
		__u64 in_val;
		__u64 out_val;
		};

		static size_t roundup_page(size_t sz)
		{
		long page_size = sysconf(_SC_PAGE_SIZE);
		return (sz + page_size - 1) / page_size * page_size;
		}

		void test_mmap(void)
		{
		const char *file = "test_mmap.o";
		const char *probe_name = "raw_tracepoint/sys_enter";
		const char *tp_name = "sys_enter";
		const size_t bss_sz = roundup_page(sizeof(struct bss_data));
		const size_t map_sz = roundup_page(sizeof(struct map_data));
		const int zero = 0, one = 1, two = 2, far = 1500;
		const long page_size = sysconf(_SC_PAGE_SIZE);
		int err, duration = 0, i, data_map_fd;
		struct bpf_program *prog;
		struct bpf_object *obj;
		struct bpf_link *link = NULL;
		struct bpf_map data_map, bss_map;
		void bss_mmaped = NULL, map_mmaped = NULL, tmp1, tmp2;
		volatile struct bss_data *bss_data;
		volatile struct map_data *map_data;
		__u64 val = 0;

		obj = bpf_object__open_file("test_mmap.o", NULL);
		if (CHECK(IS_ERR(obj), "obj_open", "failed to open '%s': %ld\n",
		file, PTR_ERR(obj)))
		return;
		prog = bpf_object__find_program_by_title(obj, probe_name);
		if (CHECK(!prog, "find_probe", "prog '%s' not found\n", probe_name))
		goto cleanup;
		err = bpf_object__load(obj);
		if (CHECK(err, "obj_load", "failed to load prog '%s': %d\n",
		probe_name, err))
		goto cleanup;

		bss_map = bpf_object__find_map_by_name(obj, "test_mma.bss");
		if (CHECK(!bss_map, "find_bss_map", ".bss map not found\n"))
		goto cleanup;
		data_map = bpf_object__find_map_by_name(obj, "data_map");
		if (CHECK(!data_map, "find_data_map", "data_map map not found\n"))
		goto cleanup;
		data_map_fd = bpf_map__fd(data_map);

		bss_mmaped = mmap(NULL, bss_sz, PROT_READ \| PROT_WRITE, MAP_SHARED,
		bpf_map__fd(bss_map), 0);
		if (CHECK(bss_mmaped == MAP_FAILED, "bss_mmap",
		".bss mmap failed: %d\n", errno)) {
		bss_mmaped = NULL;
		goto cleanup;
		}
		/* map as R/W first */
		map_mmaped = mmap(NULL, map_sz, PROT_READ \| PROT_WRITE, MAP_SHARED,
		data_map_fd, 0);
		if (CHECK(map_mmaped == MAP_FAILED, "data_mmap",
		"data_map mmap failed: %d\n", errno)) {
		map_mmaped = NULL;
		goto cleanup;
		}

		bss_data = bss_mmaped;
		map_data = map_mmaped;

		CHECK_FAIL(bss_data->in_val);
		CHECK_FAIL(bss_data->out_val);
		CHECK_FAIL(map_data->val[0]);
		CHECK_FAIL(map_data->val[1]);
		CHECK_FAIL(map_data->val[2]);
		CHECK_FAIL(map_data->val[far]);

		link = bpf_program__attach_raw_tracepoint(prog, tp_name);
		if (CHECK(IS_ERR(link), "attach_raw_tp", "err %ld\n", PTR_ERR(link)))
		goto cleanup;

		bss_data->in_val = 123;
		val = 111;
		CHECK_FAIL(bpf_map_update_elem(data_map_fd, &zero, &val, 0));

		usleep(1);

		CHECK_FAIL(bss_data->in_val != 123);
		CHECK_FAIL(bss_data->out_val != 123);
		CHECK_FAIL(map_data->val[0] != 111);
		CHECK_FAIL(map_data->val[1] != 222);
		CHECK_FAIL(map_data->val[2] != 123);
		CHECK_FAIL(map_data->val[far] != 3 * 123);

		CHECK_FAIL(bpf_map_lookup_elem(data_map_fd, &zero, &val));
		CHECK_FAIL(val != 111);
		CHECK_FAIL(bpf_map_lookup_elem(data_map_fd, &one, &val));
		CHECK_FAIL(val != 222);
		CHECK_FAIL(bpf_map_lookup_elem(data_map_fd, &two, &val));
		CHECK_FAIL(val != 123);
		CHECK_FAIL(bpf_map_lookup_elem(data_map_fd, &far, &val));
		CHECK_FAIL(val != 3 * 123);

		/* data_map freeze should fail due to R/W mmap() */
		err = bpf_map_freeze(data_map_fd);
		if (CHECK(!err \|\| errno != EBUSY, "no_freeze",
		"data_map freeze succeeded: err=%d, errno=%d\n", err, errno))
		goto cleanup;

		/* unmap R/W mapping */
		err = munmap(map_mmaped, map_sz);
		map_mmaped = NULL;
		if (CHECK(err, "data_map_munmap", "data_map munmap failed: %d\n", errno))
		goto cleanup;

		/* re-map as R/O now */
		map_mmaped = mmap(NULL, map_sz, PROT_READ, MAP_SHARED, data_map_fd, 0);
		if (CHECK(map_mmaped == MAP_FAILED, "data_mmap",
		"data_map R/O mmap failed: %d\n", errno)) {
		map_mmaped = NULL;
		goto cleanup;
		}
		map_data = map_mmaped;

		/* map/unmap in a loop to test ref counting */
		for (i = 0; i < 10; i++) {
		int flags = i % 2 ? PROT_READ : PROT_WRITE;
		void *p;

		p = mmap(NULL, map_sz, flags, MAP_SHARED, data_map_fd, 0);
		if (CHECK_FAIL(p == MAP_FAILED))
		goto cleanup;
		err = munmap(p, map_sz);
		if (CHECK_FAIL(err))
		goto cleanup;
		}

		/* data_map freeze should now succeed due to no R/W mapping */
		err = bpf_map_freeze(data_map_fd);
		if (CHECK(err, "freeze", "data_map freeze failed: err=%d, errno=%d\n",
		err, errno))
		goto cleanup;

		/* mapping as R/W now should fail */
		tmp1 = mmap(NULL, map_sz, PROT_READ \| PROT_WRITE, MAP_SHARED,
		data_map_fd, 0);
		if (CHECK(tmp1 != MAP_FAILED, "data_mmap", "mmap succeeded\n")) {
		munmap(tmp1, map_sz);
		goto cleanup;
		}

		bss_data->in_val = 321;
		usleep(1);
		CHECK_FAIL(bss_data->in_val != 321);
		CHECK_FAIL(bss_data->out_val != 321);
		CHECK_FAIL(map_data->val[0] != 111);
		CHECK_FAIL(map_data->val[1] != 222);
		CHECK_FAIL(map_data->val[2] != 321);
		CHECK_FAIL(map_data->val[far] != 3 * 321);

		/* check some more advanced mmap() manipulations */

		/* map all but last page: pages 1-3 mapped */
		tmp1 = mmap(NULL, 3 * page_size, PROT_READ, MAP_SHARED,
		data_map_fd, 0);
		if (CHECK(tmp1 == MAP_FAILED, "adv_mmap1", "errno %d\n", errno))
		goto cleanup;

		/* unmap second page: pages 1, 3 mapped */
		err = munmap(tmp1 + page_size, page_size);
		if (CHECK(err, "adv_mmap2", "errno %d\n", errno)) {
		munmap(tmp1, map_sz);
		goto cleanup;
		}

		/* map page 2 back */
		tmp2 = mmap(tmp1 + page_size, page_size, PROT_READ,
		MAP_SHARED \| MAP_FIXED, data_map_fd, 0);
		if (CHECK(tmp2 == MAP_FAILED, "adv_mmap3", "errno %d\n", errno)) {
		munmap(tmp1, page_size);
		munmap(tmp1 + 2*page_size, page_size);
		goto cleanup;
		}
		CHECK(tmp1 + page_size != tmp2, "adv_mmap4",
		"tmp1: %p, tmp2: %p\n", tmp1, tmp2);

		/* re-map all 4 pages */
		tmp2 = mmap(tmp1, 4 * page_size, PROT_READ, MAP_SHARED \| MAP_FIXED,
		data_map_fd, 0);
		if (CHECK(tmp2 == MAP_FAILED, "adv_mmap5", "errno %d\n", errno)) {
		munmap(tmp1, 3 * page_size); /* unmap page 1 */
		goto cleanup;
		}
		CHECK(tmp1 != tmp2, "adv_mmap6", "tmp1: %p, tmp2: %p\n", tmp1, tmp2);

		map_data = tmp2;
		CHECK_FAIL(bss_data->in_val != 321);
		CHECK_FAIL(bss_data->out_val != 321);
		CHECK_FAIL(map_data->val[0] != 111);
		CHECK_FAIL(map_data->val[1] != 222);
		CHECK_FAIL(map_data->val[2] != 321);
		CHECK_FAIL(map_data->val[far] != 3 * 321);

		munmap(tmp2, 4 * page_size);
		cleanup:
		if (bss_mmaped)
		CHECK_FAIL(munmap(bss_mmaped, bss_sz));
		if (map_mmaped)
		CHECK_FAIL(munmap(map_mmaped, map_sz));
		if (!IS_ERR_OR_NULL(link))
		bpf_link__destroy(link);
		bpf_object__close(obj);
		}

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

0 → 100644

+45 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		// Copyright (c) 2019 Facebook

		#include <linux/bpf.h>
		#include <stdint.h>
		#include "bpf_helpers.h"

		char _license[] SEC("license") = "GPL";

		struct {
		__uint(type, BPF_MAP_TYPE_ARRAY);
		__uint(max_entries, 512 * 4); /* at least 4 pages of data */
		__uint(map_flags, BPF_F_MMAPABLE);
		__type(key, __u32);
		__type(value, __u64);
		} data_map SEC(".maps");

		static volatile __u64 in_val;
		static volatile __u64 out_val;

		SEC("raw_tracepoint/sys_enter")
		int test_mmap(void *ctx)
		{
		int zero = 0, one = 1, two = 2, far = 1500;
		__u64 val, *p;

		out_val = in_val;

		/* data_map[2] = in_val; */
		bpf_map_update_elem(&data_map, &two, (const void *)&in_val, 0);

		/* data_map[1] = data_map[0] * 2; */
		p = bpf_map_lookup_elem(&data_map, &zero);
		if (p) {
		val = (p) 2;
		bpf_map_update_elem(&data_map, &one, &val, 0);
		}

		/* data_map[far] = in_val * 3; */
		val = in_val * 3;
		bpf_map_update_elem(&data_map, &far, &val, 0);

		return 0;
		}

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