[PATCH bpf-next 3/3] bpf: selftests: update array map tests for per-cpu batched ops

Pedro Tammela
2021-04-04T20:04:58Z

Follows the same logic as the hashtable tests.

Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
---
.../bpf/map_tests/array_map_batch_ops.c | 114 +++++++++++++-----
1 file changed, 85 insertions(+), 29 deletions(-)

diff --git a/tools/testing/selftests/bpf/map_tests/array_map_batch_ops.c b/tools/testing/selftests/bpf/map_tests/array_map_batch_ops.c
index e42ea1195d18..e71b5fbf41b4 100644
--- a/tools/testing/selftests/bpf/map_tests/array_map_batch_ops.c
+++ b/tools/testing/selftests/bpf/map_tests/array_map_batch_ops.c
@@ -7,35 +7,68 @@
#include <bpf/bpf.h>
#include <bpf/libbpf.h>

+#include <bpf_util.h>
#include <test_maps.h>

+typedef BPF_PERCPU_TYPE(int) pcpu_map_value_t;
+
static void map_batch_update(int map_fd, __u32 max_entries, int *keys,
- int *values)
+ void *values, bool is_pcpu)
{
- int i, err;
+ unsigned int nr_cpus = bpf_num_possible_cpus();
+ pcpu_map_value_t *v;
+ int i, j, err;
+ int offset = 0;
DECLARE_LIBBPF_OPTS(bpf_map_batch_opts, opts,
.elem_flags = 0,
.flags = 0,
);

+ if (is_pcpu)
+ v = values;
+
for (i = 0; i < max_entries; i++) {
keys[i] = i;
- values[i] = i + 1;
+ if (is_pcpu)
+ for (j = 0; j < nr_cpus; j++)
+ bpf_percpu(v + offset, j) = i + 1 + j;
+ else
+ ((int *)values)[i] = i + 1;
+ offset += nr_cpus;
}

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, int *values)
+static void map_batch_verify(int *visited, __u32 max_entries, int *keys,
+ void *values, bool is_pcpu)
{
- int i;
+ unsigned int nr_cpus = bpf_num_possible_cpus();
+ pcpu_map_value_t *v;
+ int i, j;
+ int offset = 0;
+
+ if (is_pcpu)
+ v = values;

memset(visited, 0, max_entries * sizeof(*visited));
for (i = 0; i < max_entries; i++) {
- CHECK(keys[i] + 1 != values[i], "key/value checking",
- "error: i %d key %d value %d\n", i, keys[i], values[i]);
+ if (is_pcpu) {
+ for (j = 0; j < nr_cpus; j++) {
+ int value = bpf_percpu(v + offset, j);
+ CHECK(keys[i] + j + 1 != value,
+ "key/value checking",
+ "error: i %d j %d key %d value %d\n", i,
+ j, keys[i], value);
+ }
+ } else {
+ CHECK(keys[i] + 1 != ((int *)values)[i],
+ "key/value checking",
+ "error: i %d key %d value %d\n", i, keys[i],
+ ((int *)values)[i]);
+ }
+ offset += nr_cpus;
visited[i] = 1;
}
for (i = 0; i < max_entries; i++) {
@@ -44,19 +77,22 @@ static void map_batch_verify(int *visited, __u32 max_entries,
}
}

-void test_array_map_batch_ops(void)
+void __test_map_lookup_and_update_batch(bool is_pcpu)
{
+ unsigned int nr_cpus = bpf_num_possible_cpus();
struct bpf_create_map_attr xattr = {
.name = "array_map",
- .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_type = is_pcpu ? BPF_MAP_TYPE_PERCPU_ARRAY :
+ BPF_MAP_TYPE_ARRAY,
.key_size = sizeof(int),
.value_size = sizeof(int),
};
- int map_fd, *keys, *values, *visited;
+ int map_fd, *keys, *visited;
__u32 count, total, total_success;
const __u32 max_entries = 10;
__u64 batch = 0;
- int err, step;
+ int err, step, value_size;
+ void *values;
DECLARE_LIBBPF_OPTS(bpf_map_batch_opts, opts,
.elem_flags = 0,
.flags = 0,
@@ -67,22 +103,24 @@ void test_array_map_batch_ops(void)
CHECK(map_fd == -1,
"bpf_create_map_xattr()", "error:%s\n", strerror(errno));

- keys = malloc(max_entries * sizeof(int));
- values = malloc(max_entries * sizeof(int));
- visited = malloc(max_entries * sizeof(int));
+ if (is_pcpu)
+ value_size = sizeof(pcpu_map_value_t) * nr_cpus;
+ else
+ value_size = sizeof(int);
+
+ keys = malloc(max_entries * sizeof(*keys));
+ values = calloc(max_entries, value_size);
+ visited = malloc(max_entries * sizeof(*visited));
CHECK(!keys || !values || !visited, "malloc()", "error:%s\n",
strerror(errno));

- /* populate elements to the map */
- map_batch_update(map_fd, max_entries, keys, values);
-
/* 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);
- map_batch_verify(visited, max_entries, keys, values);
+ 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 * sizeof(*values));
+ memset(values, 0, max_entries * value_size);
batch = 0;
total = 0;
/* iteratively lookup/delete elements with 'step'
@@ -91,10 +129,10 @@ void test_array_map_batch_ops(void)
count = step;
while (true) {
err = bpf_map_lookup_batch(map_fd,
- total ? &batch : NULL, &batch,
- keys + total,
- values + total,
- &count, &opts);
+ total ? &batch : NULL,
+ &batch, keys + total,
+ values + total * value_size,
+ &count, &opts);

CHECK((err && errno != ENOENT), "lookup with steps",
"error: %s\n", strerror(errno));
@@ -108,7 +146,7 @@ void test_array_map_batch_ops(void)
CHECK(total != max_entries, "lookup with steps",
"total = %u, max_entries = %u\n", total, max_entries);

- map_batch_verify(visited, max_entries, keys, values);
+ map_batch_verify(visited, max_entries, keys, values, is_pcpu);

total_success++;
}
@@ -116,9 +154,27 @@ void test_array_map_batch_ops(void)
CHECK(total_success == 0, "check total_success",
"unexpected failure\n");

- printf("%s:PASS\n", __func__);
-
free(keys);
- free(values);
free(visited);
+
+ if (!is_pcpu)
+ free(values);
+}
+
+void array_map_batch_ops(void)
+{
+ __test_map_lookup_and_update_batch(false);
+ printf("test_%s:PASS\n", __func__);
+}
+
+void array_percpu_map_batch_ops(void)
+{
+ __test_map_lookup_and_update_batch(true);
+ printf("test_%s:PASS\n", __func__);
+}
+
+void test_array_map_batch_ops(void)
+{
+ array_map_batch_ops();
+ array_percpu_map_batch_ops();
}
--
2.25.1