tools/testing/selftests/bpf/map_tests/array_map_batch_ops.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/map_tests/array_map_batch_ops.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/map_tests/array_map_batch_ops.c
Extension
.c
Size
4071 bytes
Lines
166
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

if (is_pcpu) {
			cpu_offset = i * nr_cpus;
			for (j = 0; j < nr_cpus; j++)
				(values + cpu_offset)[j] = i + 1 + j;
		} else {
			values[i] = i + 1;
		}
	}

	err = bpf_map_update_batch(map_fd, keys, values, &max_entries, &opts);
	CHECK(err, "bpf_map_update_batch()", "error:%s\n", strerror(errno));
}

static void map_batch_verify(int *visited, __u32 max_entries, int *keys,
			     __s64 *values, bool is_pcpu)
{
	int i, j;
	int cpu_offset = 0;

	memset(visited, 0, max_entries * sizeof(*visited));
	for (i = 0; i < max_entries; i++) {
		if (is_pcpu) {
			cpu_offset = i * nr_cpus;
			for (j = 0; j < nr_cpus; j++) {
				__s64 value = (values + cpu_offset)[j];
				CHECK(keys[i] + j + 1 != value,
				      "key/value checking",
				      "error: i %d j %d key %d value %lld\n", i,
				      j, keys[i], value);
			}
		} else {
			CHECK(keys[i] + 1 != values[i], "key/value checking",
			      "error: i %d key %d value %lld\n", i, keys[i],
			      values[i]);
		}
		visited[i] = 1;
	}
	for (i = 0; i < max_entries; i++) {
		CHECK(visited[i] != 1, "visited checking",
		      "error: keys array at index %d missing\n", i);
	}
}

static void __test_map_lookup_and_update_batch(bool is_pcpu)
{
	int map_fd, *keys, *visited;
	__u32 count, total, total_success;
	const __u32 max_entries = 10;
	__u64 batch = 0;
	int err, step, value_size;
	void *values;
	DECLARE_LIBBPF_OPTS(bpf_map_batch_opts, opts,
		.elem_flags = 0,
		.flags = 0,
	);

	map_fd = bpf_map_create(is_pcpu ? BPF_MAP_TYPE_PERCPU_ARRAY : BPF_MAP_TYPE_ARRAY,
				"array_map", sizeof(int), sizeof(__s64), max_entries, NULL);
	CHECK(map_fd == -1,
	      "bpf_map_create()", "error:%s\n", strerror(errno));

	value_size = sizeof(__s64);
	if (is_pcpu)
		value_size *= nr_cpus;

	keys = calloc(max_entries, sizeof(*keys));
	values = calloc(max_entries, value_size);
	visited = calloc(max_entries, sizeof(*visited));
	CHECK(!keys || !values || !visited, "malloc()", "error:%s\n",
	      strerror(errno));

	/* test 1: lookup in a loop with various steps. */
	total_success = 0;
	for (step = 1; step < max_entries; step++) {
		map_batch_update(map_fd, max_entries, keys, values, is_pcpu);
		map_batch_verify(visited, max_entries, keys, values, is_pcpu);
		memset(keys, 0, max_entries * sizeof(*keys));
		memset(values, 0, max_entries * value_size);
		batch = 0;
		total = 0;
		/* iteratively lookup/delete elements with 'step'
		 * elements each.
		 */
		count = step;
		while (true) {
			err = bpf_map_lookup_batch(map_fd,
						   total ? &batch : NULL,
						   &batch, keys + total,
						   values + total * value_size,
						   &count, &opts);

Annotation

Implementation Notes