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Date: Sat, 5 Nov 2022 02:51:46 +0000
From: "Ho-Ren (Jack) Chuang" <horenchuang@...edance.com>
To: Alexei Starovoitov <ast@...nel.org>,
Alexei Starovoitov <alexei.starovoitov@...il.com>,
Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
Jiri Olsa <olsajiri@...il.com>,
Andrii Nakryiko <andrii@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
John Fastabend <john.fastabend@...il.com>,
Martin KaFai Lau <martin.lau@...ux.dev>,
Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
KP Singh <kpsingh@...nel.org>,
Stanislav Fomichev <sdf@...gle.com>,
Quentin Monnet <quentin@...valent.com>,
Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Tom Rix <trix@...hat.com>,
Joanne Koong <joannelkoong@...il.com>,
Kui-Feng Lee <kuifeng@...com>,
Lorenzo Bianconi <lorenzo@...nel.org>,
Maxim Mikityanskiy <maximmi@...dia.com>,
Hao Xiang <hao.xiang@...edance.com>,
Punit Agrawal <punit.agrawal@...edance.com>,
Yifei Ma <yifeima@...edance.com>,
Xiaoning Ding <xiaoning.ding@...edance.com>,
bpf@...r.kernel.org
Cc: Ho-Ren Chuang <horenc@...edu>,
Ho-Ren Chuang <horenchuang@...edance.com>,
linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
llvm@...ts.linux.dev
Subject: [PATCH bpf-next v1 4/4] selftests/bpf: Add unit tests for BPF htab map's used size
Integrate with existing unit tests such as basic,
read/write-only htab maps, and concurrency testings for
testing htab map's used_entires.
Signed-off-by: Ho-Ren (Jack) Chuang <horenchuang@...edance.com>
---
tools/testing/selftests/bpf/test_maps.c | 74 ++++++++++++++++++++++++-
1 file changed, 73 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/bpf/test_maps.c b/tools/testing/selftests/bpf/test_maps.c
index b73152822aa2..3bd202d27563 100644
--- a/tools/testing/selftests/bpf/test_maps.c
+++ b/tools/testing/selftests/bpf/test_maps.c
@@ -38,6 +38,8 @@ static void test_hashmap(unsigned int task, void *data)
{
long long key, next_key, first_key, value;
int fd;
+ struct bpf_map_info map_info = {};
+ __u32 info_len = sizeof(map_info);
fd = bpf_map_create(BPF_MAP_TYPE_HASH, NULL, sizeof(key), sizeof(value), 2, &map_opts);
if (fd < 0) {
@@ -50,16 +52,32 @@ static void test_hashmap(unsigned int task, void *data)
/* Insert key=1 element. */
assert(bpf_map_update_elem(fd, &key, &value, BPF_ANY) == 0);
+ /* Check used_entires is now 1. */
+ assert(bpf_obj_get_info_by_fd(fd, &map_info, &info_len) == 0);
+ assert(map_info.used_entries == 1);
+
value = 0;
/* BPF_NOEXIST means add new element if it doesn't exist. */
assert(bpf_map_update_elem(fd, &key, &value, BPF_NOEXIST) < 0 &&
/* key=1 already exists. */
errno == EEXIST);
+ /* Check used_entires is still 1 because we are updating
+ * an existing element.
+ */
+ assert(bpf_obj_get_info_by_fd(fd, &map_info, &info_len) == 0);
+ assert(map_info.used_entries == 1);
+
/* -1 is an invalid flag. */
assert(bpf_map_update_elem(fd, &key, &value, -1) < 0 &&
errno == EINVAL);
+ /* Check used_entires is still 1 because the last
+ * insertion was invalid.
+ */
+ assert(bpf_obj_get_info_by_fd(fd, &map_info, &info_len) == 0);
+ assert(map_info.used_entries == 1);
+
/* Check that key=1 can be found. */
assert(bpf_map_lookup_elem(fd, &key, &value) == 0 && value == 1234);
@@ -68,6 +86,10 @@ static void test_hashmap(unsigned int task, void *data)
/* Insert key=2 element. */
assert(bpf_map_update_elem(fd, &key, &value, BPF_ANY) == 0);
+ /* Check used_entires is now 2. */
+ assert(bpf_obj_get_info_by_fd(fd, &map_info, &info_len) == 0);
+ assert(map_info.used_entries == 2);
+
/* Check that key=2 matches the value and delete it */
assert(bpf_map_lookup_and_delete_elem(fd, &key, &value) == 0 && value == 1234);
@@ -89,6 +111,10 @@ static void test_hashmap(unsigned int task, void *data)
assert(bpf_map_update_elem(fd, &key, &value, BPF_NOEXIST) < 0 &&
errno == E2BIG);
+ /* Check used_entires is now 2. */
+ assert(bpf_obj_get_info_by_fd(fd, &map_info, &info_len) == 0);
+ assert(map_info.used_entries == 2);
+
/* Update existing element, though the map is full. */
key = 1;
assert(bpf_map_update_elem(fd, &key, &value, BPF_EXIST) == 0);
@@ -102,6 +128,10 @@ static void test_hashmap(unsigned int task, void *data)
key = 0;
assert(bpf_map_delete_elem(fd, &key) < 0 && errno == ENOENT);
+ /* Check used_entires is now 2. */
+ assert(bpf_obj_get_info_by_fd(fd, &map_info, &info_len) == 0);
+ assert(map_info.used_entries == 2);
+
/* Iterate over two elements. */
assert(bpf_map_get_next_key(fd, NULL, &first_key) == 0 &&
(first_key == 1 || first_key == 2));
@@ -127,6 +157,10 @@ static void test_hashmap(unsigned int task, void *data)
assert(bpf_map_get_next_key(fd, &key, &next_key) < 0 &&
errno == ENOENT);
+ /* Check used_entires is now 0 because both elements were deleted. */
+ assert(bpf_obj_get_info_by_fd(fd, &map_info, &info_len) == 0);
+ assert(map_info.used_entries == 0);
+
close(fd);
}
@@ -292,6 +326,8 @@ static void test_hashmap_walk(unsigned int task, void *data)
int fd, i, max_entries = 10000;
long long key, value[VALUE_SIZE], next_key;
bool next_key_valid = true;
+ struct bpf_map_info map_info = {};
+ __u32 info_len = sizeof(map_info);
fd = helper_fill_hashmap(max_entries);
@@ -302,6 +338,9 @@ static void test_hashmap_walk(unsigned int task, void *data)
}
assert(i == max_entries);
+ /* Check used_entires is now max_entries. */
+ assert(bpf_obj_get_info_by_fd(fd, &map_info, &info_len) == 0);
+ assert(map_info.used_entries == max_entries);
assert(bpf_map_get_next_key(fd, NULL, &key) == 0);
for (i = 0; next_key_valid; i++) {
@@ -313,6 +352,9 @@ static void test_hashmap_walk(unsigned int task, void *data)
}
assert(i == max_entries);
+ /* Check used_entires is now max_entries. */
+ assert(bpf_obj_get_info_by_fd(fd, &map_info, &info_len) == 0);
+ assert(map_info.used_entries == max_entries);
for (i = 0; bpf_map_get_next_key(fd, !i ? NULL : &key,
&next_key) == 0; i++) {
@@ -322,6 +364,9 @@ static void test_hashmap_walk(unsigned int task, void *data)
}
assert(i == max_entries);
+ /* Check used_entires is now max_entries. */
+ assert(bpf_obj_get_info_by_fd(fd, &map_info, &info_len) == 0);
+ assert(map_info.used_entries == max_entries);
close(fd);
}
@@ -1303,13 +1348,14 @@ static void test_map_in_map(void)
static void test_map_large(void)
{
-
struct bigkey {
int a;
char b[4096];
long long c;
} key;
int fd, i, value;
+ struct bpf_map_info map_info = {};
+ __u32 info_len = sizeof(map_info);
fd = bpf_map_create(BPF_MAP_TYPE_HASH, NULL, sizeof(key), sizeof(value),
MAP_SIZE, &map_opts);
@@ -1341,6 +1387,10 @@ static void test_map_large(void)
key.a = 1;
assert(bpf_map_lookup_elem(fd, &key, &value) < 0 && errno == ENOENT);
+ /* Check used_entires is now MAP_SIZE. */
+ assert(bpf_obj_get_info_by_fd(fd, &map_info, &info_len) == 0);
+ assert(map_info.used_entries == MAP_SIZE);
+
close(fd);
}
@@ -1466,6 +1516,8 @@ static void test_map_parallel(void)
{
int i, fd, key = 0, value = 0, j = 0;
int data[2];
+ struct bpf_map_info map_info = {};
+ __u32 info_len = sizeof(map_info);
fd = bpf_map_create(BPF_MAP_TYPE_HASH, NULL, sizeof(key), sizeof(value),
MAP_SIZE, &map_opts);
@@ -1504,6 +1556,10 @@ static void test_map_parallel(void)
value == key);
}
+ /* Check used_entires is now MAP_SIZE. */
+ assert(bpf_obj_get_info_by_fd(fd, &map_info, &info_len) == 0);
+ assert(map_info.used_entries == MAP_SIZE);
+
/* Now let's delete all elemenets in parallel. */
data[1] = DO_DELETE;
run_parallel(TASKS, test_update_delete, data);
@@ -1513,6 +1569,10 @@ static void test_map_parallel(void)
assert(bpf_map_get_next_key(fd, NULL, &key) < 0 && errno == ENOENT);
assert(bpf_map_get_next_key(fd, &key, &key) < 0 && errno == ENOENT);
+ /* Check used_entires is now 0. */
+ assert(bpf_obj_get_info_by_fd(fd, &map_info, &info_len) == 0);
+ assert(map_info.used_entries == 0);
+
key = 0;
bpf_map_delete_elem(fd, &key);
if (j++ < 5)
@@ -1524,6 +1584,8 @@ static void test_map_rdonly(void)
{
int fd, key = 0, value = 0;
__u32 old_flags;
+ struct bpf_map_info map_info = {};
+ __u32 info_len = sizeof(map_info);
old_flags = map_opts.map_flags;
map_opts.map_flags |= BPF_F_RDONLY;
@@ -1546,6 +1608,10 @@ static void test_map_rdonly(void)
assert(bpf_map_lookup_elem(fd, &key, &value) < 0 && errno == ENOENT);
assert(bpf_map_get_next_key(fd, &key, &value) < 0 && errno == ENOENT);
+ /* Check used_entires is now 0. */
+ assert(bpf_obj_get_info_by_fd(fd, &map_info, &info_len) == 0);
+ assert(map_info.used_entries == 0);
+
close(fd);
}
@@ -1553,6 +1619,8 @@ static void test_map_wronly_hash(void)
{
int fd, key = 0, value = 0;
__u32 old_flags;
+ struct bpf_map_info map_info = {};
+ __u32 info_len = sizeof(map_info);
old_flags = map_opts.map_flags;
map_opts.map_flags |= BPF_F_WRONLY;
@@ -1574,6 +1642,10 @@ static void test_map_wronly_hash(void)
assert(bpf_map_lookup_elem(fd, &key, &value) < 0 && errno == EPERM);
assert(bpf_map_get_next_key(fd, &key, &value) < 0 && errno == EPERM);
+ /* Check used_entires is now 1. */
+ assert(bpf_obj_get_info_by_fd(fd, &map_info, &info_len) == 0);
+ assert(map_info.used_entries == 1);
+
close(fd);
}
--
Ho-Ren (Jack) Chuang
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