[PATCH bpf-next v4 0/4] selftests/bpf: convert three other cgroup tests to test_progs

[PATCH bpf-next v4 0/4] selftests/bpf: convert three other cgroup tests to test_progs

[Alexis Lothoré (eBPF Foundation)]

Hello,
this series brings a new set of test converted to the test_progs framework.
Since the tests are quite small, I chose to group three tests conversion in
the same series, but feel free to let me know if I should keep one series
per test. The series focuses on cgroup testing and converts the following
tests:
- get_cgroup_id_user
- cgroup_storage
- test_skb_cgroup_id_user

Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
---
Changes in v4:
- Fix test after netns addition by making sure loopack interface is up
- Link to v3: https://lore.kernel.org/r/20240812-convert_cgroup_tests-v3-0-47ac6ce4e88b@bootlin.com

Changes in v3:
- Fixed multiple leaks on cgroup file descriptors and sockets
- Used dedicated network namespaces for tests involving network
- Link to v2: https://lore.kernel.org/r/20240806-convert_cgroup_tests-v2-0-180c57e5b710@bootlin.com

Changes in v2:
- Use global variables instead of maps when possible
- Collect review tags from Alan
- Link to v1: https://lore.kernel.org/r/20240731-convert_cgroup_tests-v1-0-14cbc51b6947@bootlin.com

---
Alexis Lothoré (eBPF Foundation) (4):
      selftests/bpf: convert get_current_cgroup_id_user to test_progs
      selftests/bpf: convert test_cgroup_storage to test_progs
      selftests/bpf: add proper section name to bpf prog and rename it
      selftests/bpf: convert test_skb_cgroup_id_user to test_progs

 tools/testing/selftests/bpf/.gitignore             |   3 -
 tools/testing/selftests/bpf/Makefile               |   8 +-
 tools/testing/selftests/bpf/get_cgroup_id_user.c   | 151 -----------------
 .../selftests/bpf/prog_tests/cgroup_ancestor.c     | 169 +++++++++++++++++++
 .../bpf/prog_tests/cgroup_get_current_cgroup_id.c  |  46 ++++++
 .../selftests/bpf/prog_tests/cgroup_storage.c      |  96 +++++++++++
 ...test_skb_cgroup_id_kern.c => cgroup_ancestor.c} |  14 +-
 tools/testing/selftests/bpf/progs/cgroup_storage.c |  24 +++
 .../selftests/bpf/progs/get_cgroup_id_kern.c       |  26 +--
 tools/testing/selftests/bpf/test_cgroup_storage.c  | 174 --------------------
 tools/testing/selftests/bpf/test_skb_cgroup_id.sh  |  63 -------
 .../selftests/bpf/test_skb_cgroup_id_user.c        | 183 ---------------------
 12 files changed, 344 insertions(+), 613 deletions(-)
---
base-commit: ab2c4aa104050a184c3411a973b165285549f732
change-id: 20240725-convert_cgroup_tests-d07c66053225

Best regards,
-- 
Alexis Lothoré, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

[PATCH bpf-next v4 1/4] selftests/bpf: convert get_current_cgroup_id_user to test_progs

[Alexis Lothoré (eBPF Foundation)]

get_current_cgroup_id_user allows testing for bpf_get_current_cgroup_id()
bpf API but is not integrated into test_progs, and so is not tested
automatically in CI.

Convert it to the test_progs framework to allow running it automatically.
The most notable differences with the old test are the following:
- the new test relies on autoattach instead of manually hooking/enabling
  the targeted tracepoint through perf_event, which reduces quite a lot the
  test code size
- it also accesses bpf prog data through global variables instead of maps
- sleep duration passed to nanosleep syscall has been reduced to its
  minimum to not impact overall CI duration (we only care about the syscall
  being properly triggered, not about the passed duration)

Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
---
Changes in v3:
- close leaking cgroup file descriptor

Changes in v2:
- use global variables instead of maps

The new test_progs part has been tested in a local qemu environment:

  ./test_progs -a cgroup_get_current_cgroup_id
  47      cgroup_get_current_cgroup_id:OK
  Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED
---
 tools/testing/selftests/bpf/.gitignore             |   1 -
 tools/testing/selftests/bpf/Makefile               |   3 +-
 tools/testing/selftests/bpf/get_cgroup_id_user.c   | 151 ---------------------
 .../bpf/prog_tests/cgroup_get_current_cgroup_id.c  |  46 +++++++
 .../selftests/bpf/progs/get_cgroup_id_kern.c       |  26 +---
 5 files changed, 51 insertions(+), 176 deletions(-)

diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore
index 8f14d8faeb0b..7d4d5d3e0210 100644
--- a/tools/testing/selftests/bpf/.gitignore
+++ b/tools/testing/selftests/bpf/.gitignore
@@ -19,7 +19,6 @@ test_sock
 urandom_read
 test_sockmap
 test_lirc_mode2_user
-get_cgroup_id_user
 test_skb_cgroup_id_user
 test_cgroup_storage
 test_flow_dissector
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 7e4b107b37b4..7e8f6354c115 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -67,7 +67,7 @@ endif
 
 # Order correspond to 'make run_tests' order
 TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \
-	test_sock test_sockmap get_cgroup_id_user \
+	test_sock test_sockmap \
 	test_cgroup_storage \
 	test_tcpnotify_user test_sysctl \
 	test_progs-no_alu32
@@ -295,7 +295,6 @@ $(OUTPUT)/test_skb_cgroup_id_user: $(CGROUP_HELPERS) $(TESTING_HELPERS)
 $(OUTPUT)/test_sock: $(CGROUP_HELPERS) $(TESTING_HELPERS)
 $(OUTPUT)/test_sockmap: $(CGROUP_HELPERS) $(TESTING_HELPERS)
 $(OUTPUT)/test_tcpnotify_user: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(TRACE_HELPERS)
-$(OUTPUT)/get_cgroup_id_user: $(CGROUP_HELPERS) $(TESTING_HELPERS)
 $(OUTPUT)/test_cgroup_storage: $(CGROUP_HELPERS) $(TESTING_HELPERS)
 $(OUTPUT)/test_sock_fields: $(CGROUP_HELPERS) $(TESTING_HELPERS)
 $(OUTPUT)/test_sysctl: $(CGROUP_HELPERS) $(TESTING_HELPERS)
diff --git a/tools/testing/selftests/bpf/get_cgroup_id_user.c b/tools/testing/selftests/bpf/get_cgroup_id_user.c
deleted file mode 100644
index aefd83ebdcd7..000000000000
--- a/tools/testing/selftests/bpf/get_cgroup_id_user.c
+++ /dev/null
@@ -1,151 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (c) 2018 Facebook
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <syscall.h>
-#include <unistd.h>
-#include <linux/perf_event.h>
-#include <sys/ioctl.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-
-#include <linux/bpf.h>
-#include <bpf/bpf.h>
-#include <bpf/libbpf.h>
-
-#include "cgroup_helpers.h"
-#include "testing_helpers.h"
-
-#define CHECK(condition, tag, format...) ({		\
-	int __ret = !!(condition);			\
-	if (__ret) {					\
-		printf("%s:FAIL:%s ", __func__, tag);	\
-		printf(format);				\
-	} else {					\
-		printf("%s:PASS:%s\n", __func__, tag);	\
-	}						\
-	__ret;						\
-})
-
-static int bpf_find_map(const char *test, struct bpf_object *obj,
-			const char *name)
-{
-	struct bpf_map *map;
-
-	map = bpf_object__find_map_by_name(obj, name);
-	if (!map)
-		return -1;
-	return bpf_map__fd(map);
-}
-
-#define TEST_CGROUP "/test-bpf-get-cgroup-id/"
-
-int main(int argc, char **argv)
-{
-	const char *probe_name = "syscalls/sys_enter_nanosleep";
-	const char *file = "get_cgroup_id_kern.bpf.o";
-	int err, bytes, efd, prog_fd, pmu_fd;
-	int cgroup_fd, cgidmap_fd, pidmap_fd;
-	struct perf_event_attr attr = {};
-	struct bpf_object *obj;
-	__u64 kcgid = 0, ucgid;
-	__u32 key = 0, pid;
-	int exit_code = 1;
-	char buf[256];
-	const struct timespec req = {
-		.tv_sec = 1,
-		.tv_nsec = 0,
-	};
-
-	cgroup_fd = cgroup_setup_and_join(TEST_CGROUP);
-	if (CHECK(cgroup_fd < 0, "cgroup_setup_and_join", "err %d errno %d\n", cgroup_fd, errno))
-		return 1;
-
-	/* Use libbpf 1.0 API mode */
-	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
-
-	err = bpf_prog_test_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);
-	if (CHECK(err, "bpf_prog_test_load", "err %d errno %d\n", err, errno))
-		goto cleanup_cgroup_env;
-
-	cgidmap_fd = bpf_find_map(__func__, obj, "cg_ids");
-	if (CHECK(cgidmap_fd < 0, "bpf_find_map", "err %d errno %d\n",
-		  cgidmap_fd, errno))
-		goto close_prog;
-
-	pidmap_fd = bpf_find_map(__func__, obj, "pidmap");
-	if (CHECK(pidmap_fd < 0, "bpf_find_map", "err %d errno %d\n",
-		  pidmap_fd, errno))
-		goto close_prog;
-
-	pid = getpid();
-	bpf_map_update_elem(pidmap_fd, &key, &pid, 0);
-
-	if (access("/sys/kernel/tracing/trace", F_OK) == 0) {
-		snprintf(buf, sizeof(buf),
-			 "/sys/kernel/tracing/events/%s/id", probe_name);
-	} else {
-		snprintf(buf, sizeof(buf),
-			 "/sys/kernel/debug/tracing/events/%s/id", probe_name);
-	}
-	efd = open(buf, O_RDONLY, 0);
-	if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno))
-		goto close_prog;
-	bytes = read(efd, buf, sizeof(buf));
-	close(efd);
-	if (CHECK(bytes <= 0 || bytes >= sizeof(buf), "read",
-		  "bytes %d errno %d\n", bytes, errno))
-		goto close_prog;
-
-	attr.config = strtol(buf, NULL, 0);
-	attr.type = PERF_TYPE_TRACEPOINT;
-	attr.sample_type = PERF_SAMPLE_RAW;
-	attr.sample_period = 1;
-	attr.wakeup_events = 1;
-
-	/* attach to this pid so the all bpf invocations will be in the
-	 * cgroup associated with this pid.
-	 */
-	pmu_fd = syscall(__NR_perf_event_open, &attr, getpid(), -1, -1, 0);
-	if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n", pmu_fd,
-		  errno))
-		goto close_prog;
-
-	err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0);
-	if (CHECK(err, "perf_event_ioc_enable", "err %d errno %d\n", err,
-		  errno))
-		goto close_pmu;
-
-	err = ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd);
-	if (CHECK(err, "perf_event_ioc_set_bpf", "err %d errno %d\n", err,
-		  errno))
-		goto close_pmu;
-
-	/* trigger some syscalls */
-	syscall(__NR_nanosleep, &req, NULL);
-
-	err = bpf_map_lookup_elem(cgidmap_fd, &key, &kcgid);
-	if (CHECK(err, "bpf_map_lookup_elem", "err %d errno %d\n", err, errno))
-		goto close_pmu;
-
-	ucgid = get_cgroup_id(TEST_CGROUP);
-	if (CHECK(kcgid != ucgid, "compare_cgroup_id",
-		  "kern cgid %llx user cgid %llx", kcgid, ucgid))
-		goto close_pmu;
-
-	exit_code = 0;
-	printf("%s:PASS\n", argv[0]);
-
-close_pmu:
-	close(pmu_fd);
-close_prog:
-	bpf_object__close(obj);
-cleanup_cgroup_env:
-	cleanup_cgroup_environment();
-	return exit_code;
-}
diff --git a/tools/testing/selftests/bpf/prog_tests/cgroup_get_current_cgroup_id.c b/tools/testing/selftests/bpf/prog_tests/cgroup_get_current_cgroup_id.c
new file mode 100644
index 000000000000..7a1643b03bf3
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/cgroup_get_current_cgroup_id.c
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+#include "test_progs.h"
+#include "cgroup_helpers.h"
+#include "get_cgroup_id_kern.skel.h"
+
+#define TEST_CGROUP "/test-bpf-get-cgroup-id/"
+
+void test_cgroup_get_current_cgroup_id(void)
+{
+	struct get_cgroup_id_kern *skel;
+	const struct timespec req = {
+		.tv_sec = 0,
+		.tv_nsec = 1,
+	};
+	int cgroup_fd;
+	__u64 ucgid;
+
+	cgroup_fd = cgroup_setup_and_join(TEST_CGROUP);
+	if (!ASSERT_OK_FD(cgroup_fd, "cgroup switch"))
+		return;
+
+	skel = get_cgroup_id_kern__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "load program"))
+		goto cleanup_cgroup;
+
+	if (!ASSERT_OK(get_cgroup_id_kern__attach(skel), "attach bpf program"))
+		goto cleanup_progs;
+
+	skel->bss->expected_pid = getpid();
+	/* trigger the syscall on which is attached the tested prog */
+	if (!ASSERT_OK(syscall(__NR_nanosleep, &req, NULL), "nanosleep"))
+		goto cleanup_progs;
+
+	ucgid = get_cgroup_id(TEST_CGROUP);
+
+	ASSERT_EQ(skel->bss->cg_id, ucgid, "compare cgroup ids");
+
+cleanup_progs:
+	get_cgroup_id_kern__destroy(skel);
+cleanup_cgroup:
+	close(cgroup_fd);
+	cleanup_cgroup_environment();
+}
diff --git a/tools/testing/selftests/bpf/progs/get_cgroup_id_kern.c b/tools/testing/selftests/bpf/progs/get_cgroup_id_kern.c
index 68587b1de34e..30fd504856c7 100644
--- a/tools/testing/selftests/bpf/progs/get_cgroup_id_kern.c
+++ b/tools/testing/selftests/bpf/progs/get_cgroup_id_kern.c
@@ -4,34 +4,16 @@
 #include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 
-struct {
-	__uint(type, BPF_MAP_TYPE_ARRAY);
-	__uint(max_entries, 1);
-	__type(key, __u32);
-	__type(value, __u64);
-} cg_ids SEC(".maps");
-
-struct {
-	__uint(type, BPF_MAP_TYPE_ARRAY);
-	__uint(max_entries, 1);
-	__type(key, __u32);
-	__type(value, __u32);
-} pidmap SEC(".maps");
+__u64 cg_id;
+__u64 expected_pid;
 
 SEC("tracepoint/syscalls/sys_enter_nanosleep")
 int trace(void *ctx)
 {
 	__u32 pid = bpf_get_current_pid_tgid();
-	__u32 key = 0, *expected_pid;
-	__u64 *val;
-
-	expected_pid = bpf_map_lookup_elem(&pidmap, &key);
-	if (!expected_pid || *expected_pid != pid)
-		return 0;
 
-	val = bpf_map_lookup_elem(&cg_ids, &key);
-	if (val)
-		*val = bpf_get_current_cgroup_id();
+	if (expected_pid == pid)
+		cg_id = bpf_get_current_cgroup_id();
 
 	return 0;
 }

-- 
2.46.0

[PATCH bpf-next v4 2/4] selftests/bpf: convert test_cgroup_storage to test_progs

[Alexis Lothoré (eBPF Foundation)]

test_cgroup_storage is currently a standalone program which is not run
when executing test_progs.

Convert it to the test_progs framework so it can be automatically executed
in CI. The conversion led to the following changes:
- converted the raw bpf program in the userspace test file into a dedicated
  test program in progs/ dir
- reduced the scope of cgroup_storage test: the content from this test
  overlaps with some other tests already present in test_progs, most
  notably netcnt and cgroup_storage_multi*. Those tests already check
  extensively local storage, per-cpu local storage, cgroups interaction,
  etc. So the new test only keep the part testing that the program return
  code (based on map content) properly leads to packet being passed or
  dropped.

Reviewed-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
---
Changes in v4:
- fix test failure by bringing up loopback netif on remote netns

Changes in v3:
- close leaking cgroup file descriptor
- run test in dedicated network namespace

Tested in a local qemu environment:

  ./test_progs -a cgroup_storage
  53      cgroup_storage:OK
  Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED
---
 tools/testing/selftests/bpf/.gitignore             |   1 -
 tools/testing/selftests/bpf/Makefile               |   2 -
 .../selftests/bpf/prog_tests/cgroup_storage.c      |  96 ++++++++++++
 tools/testing/selftests/bpf/progs/cgroup_storage.c |  24 +++
 tools/testing/selftests/bpf/test_cgroup_storage.c  | 174 ---------------------
 5 files changed, 120 insertions(+), 177 deletions(-)

diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore
index 7d4d5d3e0210..fd7ae37024e2 100644
--- a/tools/testing/selftests/bpf/.gitignore
+++ b/tools/testing/selftests/bpf/.gitignore
@@ -20,7 +20,6 @@ urandom_read
 test_sockmap
 test_lirc_mode2_user
 test_skb_cgroup_id_user
-test_cgroup_storage
 test_flow_dissector
 flow_dissector_load
 test_tcpnotify_user
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 7e8f6354c115..29d689610ba2 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -68,7 +68,6 @@ endif
 # Order correspond to 'make run_tests' order
 TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \
 	test_sock test_sockmap \
-	test_cgroup_storage \
 	test_tcpnotify_user test_sysctl \
 	test_progs-no_alu32
 TEST_INST_SUBDIRS := no_alu32
@@ -295,7 +294,6 @@ $(OUTPUT)/test_skb_cgroup_id_user: $(CGROUP_HELPERS) $(TESTING_HELPERS)
 $(OUTPUT)/test_sock: $(CGROUP_HELPERS) $(TESTING_HELPERS)
 $(OUTPUT)/test_sockmap: $(CGROUP_HELPERS) $(TESTING_HELPERS)
 $(OUTPUT)/test_tcpnotify_user: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(TRACE_HELPERS)
-$(OUTPUT)/test_cgroup_storage: $(CGROUP_HELPERS) $(TESTING_HELPERS)
 $(OUTPUT)/test_sock_fields: $(CGROUP_HELPERS) $(TESTING_HELPERS)
 $(OUTPUT)/test_sysctl: $(CGROUP_HELPERS) $(TESTING_HELPERS)
 $(OUTPUT)/test_tag: $(TESTING_HELPERS)
diff --git a/tools/testing/selftests/bpf/prog_tests/cgroup_storage.c b/tools/testing/selftests/bpf/prog_tests/cgroup_storage.c
new file mode 100644
index 000000000000..cf395715ced4
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/cgroup_storage.c
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <test_progs.h>
+#include "cgroup_helpers.h"
+#include "network_helpers.h"
+#include "cgroup_storage.skel.h"
+
+#define TEST_CGROUP "/test-bpf-cgroup-storage-buf/"
+#define TEST_NS "cgroup_storage_ns"
+#define PING_CMD "ping localhost -c 1 -W 1 -q"
+
+static int setup_network(struct nstoken **token)
+{
+	SYS(fail, "ip netns add %s", TEST_NS);
+	*token = open_netns(TEST_NS);
+	if (!ASSERT_OK_PTR(*token, "open netns"))
+		goto cleanup_ns;
+	SYS(cleanup_ns, "ip link set lo up");
+
+	return 0;
+
+cleanup_ns:
+	SYS_NOFAIL("ip netns del %s", TEST_NS);
+fail:
+	return -1;
+}
+
+static void cleanup_network(struct nstoken *ns)
+{
+	close_netns(ns);
+	SYS_NOFAIL("ip netns del %s", TEST_NS);
+}
+
+void test_cgroup_storage(void)
+{
+	struct bpf_cgroup_storage_key key;
+	struct cgroup_storage *skel;
+	struct nstoken *ns = NULL;
+	unsigned long long value;
+	int cgroup_fd;
+	int err;
+
+	cgroup_fd = cgroup_setup_and_join(TEST_CGROUP);
+	if (!ASSERT_OK_FD(cgroup_fd, "create cgroup"))
+		return;
+
+	if (!ASSERT_OK(setup_network(&ns), "setup network"))
+		goto cleanup_cgroup;
+
+	skel = cgroup_storage__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "load program"))
+		goto cleanup_network;
+
+	skel->links.bpf_prog =
+		bpf_program__attach_cgroup(skel->progs.bpf_prog, cgroup_fd);
+	if (!ASSERT_OK_PTR(skel->links.bpf_prog, "attach program"))
+		goto cleanup_progs;
+
+	/* Check that one out of every two packets is dropped */
+	err = SYS_NOFAIL(PING_CMD);
+	ASSERT_OK(err, "first ping");
+	err = SYS_NOFAIL(PING_CMD);
+	ASSERT_NEQ(err, 0, "second ping");
+	err = SYS_NOFAIL(PING_CMD);
+	ASSERT_OK(err, "third ping");
+
+	err = bpf_map__get_next_key(skel->maps.cgroup_storage, NULL, &key,
+				    sizeof(key));
+	if (!ASSERT_OK(err, "get first key"))
+		goto cleanup_progs;
+	err = bpf_map__lookup_elem(skel->maps.cgroup_storage, &key, sizeof(key),
+				   &value, sizeof(value), 0);
+	if (!ASSERT_OK(err, "first packet count read"))
+		goto cleanup_progs;
+
+	/* Add one to the packet counter, check again packet filtering */
+	value++;
+	err = bpf_map__update_elem(skel->maps.cgroup_storage, &key, sizeof(key),
+				   &value, sizeof(value), 0);
+	if (!ASSERT_OK(err, "increment packet counter"))
+		goto cleanup_progs;
+	err = SYS_NOFAIL(PING_CMD);
+	ASSERT_OK(err, "fourth ping");
+	err = SYS_NOFAIL(PING_CMD);
+	ASSERT_NEQ(err, 0, "fifth ping");
+	err = SYS_NOFAIL(PING_CMD);
+	ASSERT_OK(err, "sixth ping");
+
+cleanup_progs:
+	cgroup_storage__destroy(skel);
+cleanup_network:
+	cleanup_network(ns);
+cleanup_cgroup:
+	close(cgroup_fd);
+	cleanup_cgroup_environment();
+}
diff --git a/tools/testing/selftests/bpf/progs/cgroup_storage.c b/tools/testing/selftests/bpf/progs/cgroup_storage.c
new file mode 100644
index 000000000000..db1e4d2d3281
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/cgroup_storage.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+
+struct {
+	__uint(type, BPF_MAP_TYPE_CGROUP_STORAGE);
+	__type(key, struct bpf_cgroup_storage_key);
+	__type(value, __u64);
+} cgroup_storage SEC(".maps");
+
+SEC("cgroup_skb/egress")
+int bpf_prog(struct __sk_buff *skb)
+{
+	__u64 *counter;
+
+	counter = bpf_get_local_storage(&cgroup_storage, 0);
+	__sync_fetch_and_add(counter, 1);
+
+	/* Drop one out of every two packets */
+	return (*counter & 1);
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/test_cgroup_storage.c b/tools/testing/selftests/bpf/test_cgroup_storage.c
deleted file mode 100644
index 0861ea60dcdd..000000000000
--- a/tools/testing/selftests/bpf/test_cgroup_storage.c
+++ /dev/null
@@ -1,174 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <assert.h>
-#include <bpf/bpf.h>
-#include <linux/filter.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/sysinfo.h>
-
-#include "bpf_util.h"
-#include "cgroup_helpers.h"
-#include "testing_helpers.h"
-
-char bpf_log_buf[BPF_LOG_BUF_SIZE];
-
-#define TEST_CGROUP "/test-bpf-cgroup-storage-buf/"
-
-int main(int argc, char **argv)
-{
-	struct bpf_insn prog[] = {
-		BPF_LD_MAP_FD(BPF_REG_1, 0), /* percpu map fd */
-		BPF_MOV64_IMM(BPF_REG_2, 0), /* flags, not used */
-		BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
-			     BPF_FUNC_get_local_storage),
-		BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_0, 0),
-		BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, 0x1),
-		BPF_STX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0),
-
-		BPF_LD_MAP_FD(BPF_REG_1, 0), /* map fd */
-		BPF_MOV64_IMM(BPF_REG_2, 0), /* flags, not used */
-		BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
-			     BPF_FUNC_get_local_storage),
-		BPF_MOV64_IMM(BPF_REG_1, 1),
-		BPF_ATOMIC_OP(BPF_DW, BPF_ADD, BPF_REG_0, BPF_REG_1, 0),
-		BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, 0),
-		BPF_ALU64_IMM(BPF_AND, BPF_REG_1, 0x1),
-		BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
-		BPF_EXIT_INSN(),
-	};
-	size_t insns_cnt = ARRAY_SIZE(prog);
-	int error = EXIT_FAILURE;
-	int map_fd, percpu_map_fd, prog_fd, cgroup_fd;
-	struct bpf_cgroup_storage_key key;
-	unsigned long long value;
-	unsigned long long *percpu_value;
-	int cpu, nproc;
-
-	nproc = bpf_num_possible_cpus();
-	percpu_value = malloc(sizeof(*percpu_value) * nproc);
-	if (!percpu_value) {
-		printf("Not enough memory for per-cpu area (%d cpus)\n", nproc);
-		goto err;
-	}
-
-	/* Use libbpf 1.0 API mode */
-	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
-
-	map_fd = bpf_map_create(BPF_MAP_TYPE_CGROUP_STORAGE, NULL, sizeof(key),
-				sizeof(value), 0, NULL);
-	if (map_fd < 0) {
-		printf("Failed to create map: %s\n", strerror(errno));
-		goto out;
-	}
-
-	percpu_map_fd = bpf_map_create(BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE, NULL,
-				       sizeof(key), sizeof(value), 0, NULL);
-	if (percpu_map_fd < 0) {
-		printf("Failed to create map: %s\n", strerror(errno));
-		goto out;
-	}
-
-	prog[0].imm = percpu_map_fd;
-	prog[7].imm = map_fd;
-	prog_fd = bpf_test_load_program(BPF_PROG_TYPE_CGROUP_SKB,
-				   prog, insns_cnt, "GPL", 0,
-				   bpf_log_buf, BPF_LOG_BUF_SIZE);
-	if (prog_fd < 0) {
-		printf("Failed to load bpf program: %s\n", bpf_log_buf);
-		goto out;
-	}
-
-	cgroup_fd = cgroup_setup_and_join(TEST_CGROUP);
-
-	/* Attach the bpf program */
-	if (bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_INET_EGRESS, 0)) {
-		printf("Failed to attach bpf program\n");
-		goto err;
-	}
-
-	if (bpf_map_get_next_key(map_fd, NULL, &key)) {
-		printf("Failed to get the first key in cgroup storage\n");
-		goto err;
-	}
-
-	if (bpf_map_lookup_elem(map_fd, &key, &value)) {
-		printf("Failed to lookup cgroup storage 0\n");
-		goto err;
-	}
-
-	for (cpu = 0; cpu < nproc; cpu++)
-		percpu_value[cpu] = 1000;
-
-	if (bpf_map_update_elem(percpu_map_fd, &key, percpu_value, 0)) {
-		printf("Failed to update the data in the cgroup storage\n");
-		goto err;
-	}
-
-	/* Every second packet should be dropped */
-	assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0);
-	assert(system("ping localhost -c 1 -W 1 -q > /dev/null"));
-	assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0);
-
-	/* Check the counter in the cgroup local storage */
-	if (bpf_map_lookup_elem(map_fd, &key, &value)) {
-		printf("Failed to lookup cgroup storage\n");
-		goto err;
-	}
-
-	if (value != 3) {
-		printf("Unexpected data in the cgroup storage: %llu\n", value);
-		goto err;
-	}
-
-	/* Bump the counter in the cgroup local storage */
-	value++;
-	if (bpf_map_update_elem(map_fd, &key, &value, 0)) {
-		printf("Failed to update the data in the cgroup storage\n");
-		goto err;
-	}
-
-	/* Every second packet should be dropped */
-	assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0);
-	assert(system("ping localhost -c 1 -W 1 -q > /dev/null"));
-	assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0);
-
-	/* Check the final value of the counter in the cgroup local storage */
-	if (bpf_map_lookup_elem(map_fd, &key, &value)) {
-		printf("Failed to lookup the cgroup storage\n");
-		goto err;
-	}
-
-	if (value != 7) {
-		printf("Unexpected data in the cgroup storage: %llu\n", value);
-		goto err;
-	}
-
-	/* Check the final value of the counter in the percpu local storage */
-
-	for (cpu = 0; cpu < nproc; cpu++)
-		percpu_value[cpu] = 0;
-
-	if (bpf_map_lookup_elem(percpu_map_fd, &key, percpu_value)) {
-		printf("Failed to lookup the per-cpu cgroup storage\n");
-		goto err;
-	}
-
-	value = 0;
-	for (cpu = 0; cpu < nproc; cpu++)
-		value += percpu_value[cpu];
-
-	if (value != nproc * 1000 + 6) {
-		printf("Unexpected data in the per-cpu cgroup storage\n");
-		goto err;
-	}
-
-	error = 0;
-	printf("test_cgroup_storage:PASS\n");
-
-err:
-	cleanup_cgroup_environment();
-	free(percpu_value);
-
-out:
-	return error;
-}

-- 
2.46.0

[PATCH bpf-next v4 3/4] selftests/bpf: add proper section name to bpf prog and rename it

[Alexis Lothoré (eBPF Foundation)]

test_skb_cgroup_id_kern.c is currently involved in a manual test. In its
current form, it can not be used with the auto-generated skeleton APIs,
because the section name is not valid to allow libbpf to deduce the program
type.

Update section name to allow skeleton APIs usage. Also rename the program
name to make it shorter and more straighforward regarding the API it is
testing. While doing so, make sure that test_skb_cgroup_id.sh passes to get
a working reference before converting it to test_progs
- update the obj name
- fix loading issue (verifier rejecting the program when loaded through tc,
  because of map not found), by preloading the whole obj with bpftool

Reviewed-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
---
 .../progs/{test_skb_cgroup_id_kern.c => cgroup_ancestor.c}   |  2 +-
 tools/testing/selftests/bpf/test_skb_cgroup_id.sh            | 12 ++++++++----
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/bpf/progs/test_skb_cgroup_id_kern.c b/tools/testing/selftests/bpf/progs/cgroup_ancestor.c
similarity index 97%
rename from tools/testing/selftests/bpf/progs/test_skb_cgroup_id_kern.c
rename to tools/testing/selftests/bpf/progs/cgroup_ancestor.c
index 37aacc66cd68..4879645f5827 100644
--- a/tools/testing/selftests/bpf/progs/test_skb_cgroup_id_kern.c
+++ b/tools/testing/selftests/bpf/progs/cgroup_ancestor.c
@@ -28,7 +28,7 @@ static __always_inline void log_nth_level(struct __sk_buff *skb, __u32 level)
 	bpf_map_update_elem(&cgroup_ids, &level, &id, 0);
 }
 
-SEC("cgroup_id_logger")
+SEC("tc")
 int log_cgroup_id(struct __sk_buff *skb)
 {
 	/* Loop unroll can't be used here due to [1]. Unrolling manually.
diff --git a/tools/testing/selftests/bpf/test_skb_cgroup_id.sh b/tools/testing/selftests/bpf/test_skb_cgroup_id.sh
index 515c2eafc97f..d7dad49175c2 100755
--- a/tools/testing/selftests/bpf/test_skb_cgroup_id.sh
+++ b/tools/testing/selftests/bpf/test_skb_cgroup_id.sh
@@ -30,8 +30,10 @@ setup()
 	wait_for_ip
 
 	tc qdisc add dev ${TEST_IF} clsact
-	tc filter add dev ${TEST_IF} egress bpf obj ${BPF_PROG_OBJ} \
-		sec ${BPF_PROG_SECTION} da
+	mkdir -p /sys/fs/bpf/${BPF_PROG_PIN}
+	bpftool prog loadall ${BPF_PROG_OBJ} /sys/fs/bpf/${BPF_PROG_PIN} type tc
+	tc filter add dev ${TEST_IF} egress bpf da object-pinned \
+		/sys/fs/bpf/${BPF_PROG_PIN}/${BPF_PROG_NAME}
 
 	BPF_PROG_ID=$(tc filter show dev ${TEST_IF} egress | \
 			awk '/ id / {sub(/.* id /, "", $0); print($1)}')
@@ -41,6 +43,7 @@ cleanup()
 {
 	ip link del ${TEST_IF} 2>/dev/null || :
 	ip link del ${TEST_IF_PEER} 2>/dev/null || :
+	rm -rf /sys/fs/bpf/${BPF_PROG_PIN}
 }
 
 main()
@@ -54,8 +57,9 @@ DIR=$(dirname $0)
 TEST_IF="test_cgid_1"
 TEST_IF_PEER="test_cgid_2"
 MAX_PING_TRIES=5
-BPF_PROG_OBJ="${DIR}/test_skb_cgroup_id_kern.bpf.o"
-BPF_PROG_SECTION="cgroup_id_logger"
+BPF_PROG_PIN="cgroup_ancestor"
+BPF_PROG_OBJ="${DIR}/${BPF_PROG_PIN}.bpf.o"
+BPF_PROG_NAME="log_cgroup_id"
 BPF_PROG_ID=0
 PROG="${DIR}/test_skb_cgroup_id_user"
 type ping6 >/dev/null 2>&1 && PING6="ping6" || PING6="ping -6"

-- 
2.46.0

[PATCH bpf-next v4 4/4] selftests/bpf: convert test_skb_cgroup_id_user to test_progs

[Alexis Lothoré (eBPF Foundation)]

test_skb_cgroup_id_user allows testing skb cgroup id retrieval at different
levels, but is not integrated in test_progs, so it is not run
automatically in CI. The test overlaps a bit with
cgroup_skb_sk_lookup_kern, which is integrated in test_progs and test
extensively skb cgroup helpers, but there is still one major difference
between the two tests which justifies the conversion:
cgroup_skb_sk_lookup_kern deals with a BPF_PROG_TYPE_CGROUP_SKB (attached
on a cgroup), while test_skb_cgroup_id_user deals with a
BPF_PROG_TYPE_SCHED_CLS (attached on a qdisc)

Convert test_skb_cgroup_id_user into test_progs framework in order to run
it automatically in CI. The main differences with the original test are the
following:
- rename the test to make it shorter and more straightforward regarding
  tested feature
- the wrapping shell script has been dropped since every setup step is now
  handled in the main C test file
- the test has been renamed for a shorter name and reflecting the tested
  API
- add dedicated assert log per level to ease test failure debugging
- use global variables instead of maps to access bpf prog data

Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
---
Changes in v3:
- close leaking socket
- close leaking cgroup file descriptor
- run test in dedicated network namespace

Changes in v2:
- use global variables instead of maps

The new test has been tested in a qemu environment:

  ./test_progs -a cgroup_ancestor
  44      cgroup_ancestor:OK
  Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED
---
 tools/testing/selftests/bpf/.gitignore             |   1 -
 tools/testing/selftests/bpf/Makefile               |   3 +-
 .../selftests/bpf/prog_tests/cgroup_ancestor.c     | 169 +++++++++++++++++++
 .../testing/selftests/bpf/progs/cgroup_ancestor.c  |  12 +-
 tools/testing/selftests/bpf/test_skb_cgroup_id.sh  |  67 --------
 .../selftests/bpf/test_skb_cgroup_id_user.c        | 183 ---------------------
 6 files changed, 172 insertions(+), 263 deletions(-)

diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore
index fd7ae37024e2..99ffea1fa5c6 100644
--- a/tools/testing/selftests/bpf/.gitignore
+++ b/tools/testing/selftests/bpf/.gitignore
@@ -19,7 +19,6 @@ test_sock
 urandom_read
 test_sockmap
 test_lirc_mode2_user
-test_skb_cgroup_id_user
 test_flow_dissector
 flow_dissector_load
 test_tcpnotify_user
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 29d689610ba2..b1259922d0aa 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -137,7 +137,7 @@ TEST_PROGS_EXTENDED := with_addr.sh \
 	test_xdp_vlan.sh test_bpftool.py
 
 # Compile but not part of 'make run_tests'
-TEST_GEN_PROGS_EXTENDED = test_skb_cgroup_id_user \
+TEST_GEN_PROGS_EXTENDED = \
 	flow_dissector_load test_flow_dissector test_tcp_check_syncookie_user \
 	test_lirc_mode2_user xdping test_cpp runqslower bench bpf_testmod.ko \
 	xskxceiver xdp_redirect_multi xdp_synproxy veristat xdp_hw_metadata \
@@ -290,7 +290,6 @@ JSON_WRITER		:= $(OUTPUT)/json_writer.o
 CAP_HELPERS	:= $(OUTPUT)/cap_helpers.o
 NETWORK_HELPERS := $(OUTPUT)/network_helpers.o
 
-$(OUTPUT)/test_skb_cgroup_id_user: $(CGROUP_HELPERS) $(TESTING_HELPERS)
 $(OUTPUT)/test_sock: $(CGROUP_HELPERS) $(TESTING_HELPERS)
 $(OUTPUT)/test_sockmap: $(CGROUP_HELPERS) $(TESTING_HELPERS)
 $(OUTPUT)/test_tcpnotify_user: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(TRACE_HELPERS)
diff --git a/tools/testing/selftests/bpf/prog_tests/cgroup_ancestor.c b/tools/testing/selftests/bpf/prog_tests/cgroup_ancestor.c
new file mode 100644
index 000000000000..2965595cb166
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/cgroup_ancestor.c
@@ -0,0 +1,169 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "test_progs.h"
+#include "network_helpers.h"
+#include "cgroup_helpers.h"
+#include "cgroup_ancestor.skel.h"
+
+#define VETH_PREFIX "test_cgid_"
+#define VETH_1 VETH_PREFIX "1"
+#define VETH_2 VETH_PREFIX "2"
+#define CGROUP_PATH "/skb_cgroup_test"
+#define TEST_NS "cgroup_ancestor_ns"
+#define NUM_CGROUP_LEVELS 4
+#define WAIT_AUTO_IP_MAX_ATTEMPT 10
+#define DST_ADDR "ff02::1"
+#define DST_PORT 1234
+#define MAX_ASSERT_NAME 32
+
+struct test_data {
+	struct cgroup_ancestor *skel;
+	struct bpf_tc_hook qdisc;
+	struct bpf_tc_opts tc_attach;
+	struct nstoken *ns;
+};
+
+static int send_datagram(void)
+{
+	unsigned char buf[] = "some random test data";
+	struct sockaddr_in6 addr = { .sin6_family = AF_INET6,
+				     .sin6_port = htons(DST_PORT),
+				     .sin6_scope_id = if_nametoindex(VETH_1) };
+	int sock, n;
+
+	if (!ASSERT_EQ(inet_pton(AF_INET6, DST_ADDR, &addr.sin6_addr), 1,
+		       "inet_pton"))
+		return -1;
+
+	sock = socket(AF_INET6, SOCK_DGRAM, 0);
+	if (!ASSERT_OK_FD(sock, "create socket"))
+		return sock;
+
+	n = sendto(sock, buf, sizeof(buf), 0, (const struct sockaddr *)&addr,
+		   sizeof(addr));
+	ASSERT_EQ(n, sizeof(buf), "send data");
+	close(sock);
+
+	return n  == sizeof(buf) ? 0 : n;
+}
+
+static int wait_local_ip(void)
+{
+	char *ping_cmd = ping_command(AF_INET6);
+	int i, err;
+
+	for (i = 0; i < WAIT_AUTO_IP_MAX_ATTEMPT; i++) {
+		err = SYS_NOFAIL("%s -c 1 -W 1 %s%%%s", ping_cmd, DST_ADDR,
+				 VETH_1);
+		if (!err)
+			break;
+	}
+
+	return err;
+}
+
+static int setup_network(struct test_data *t)
+{
+	int ret;
+
+	SYS(fail, "ip netns add %s", TEST_NS);
+	t->ns = open_netns(TEST_NS);
+	if (!ASSERT_OK_PTR(t->ns, "open netns"))
+		goto cleanup_ns;
+
+	SYS(close_ns, "ip link add dev %s type veth peer name %s",
+	    VETH_1, VETH_2);
+	SYS(close_ns, "ip link set %s up", VETH_1);
+	SYS(close_ns, "ip link set %s up", VETH_2);
+
+	ret = wait_local_ip();
+	if (!ASSERT_EQ(ret, 0, "wait local ip"))
+		goto cleanup_interfaces;
+
+	memset(&t->qdisc, 0, sizeof(t->qdisc));
+	t->qdisc.sz = sizeof(t->qdisc);
+	t->qdisc.attach_point = BPF_TC_EGRESS;
+	t->qdisc.ifindex = if_nametoindex(VETH_1);
+	if (!ASSERT_NEQ(t->qdisc.ifindex, 0, "if_nametoindex"))
+		goto cleanup_interfaces;
+	if (!ASSERT_OK(bpf_tc_hook_create(&t->qdisc), "qdisc add"))
+		goto cleanup_interfaces;
+
+	memset(&t->tc_attach, 0, sizeof(t->tc_attach));
+	t->tc_attach.sz = sizeof(t->tc_attach);
+	t->tc_attach.prog_fd = bpf_program__fd(t->skel->progs.log_cgroup_id);
+	if (!ASSERT_OK(bpf_tc_attach(&t->qdisc, &t->tc_attach), "filter add"))
+		goto cleanup_qdisc;
+
+	return 0;
+
+cleanup_qdisc:
+	bpf_tc_hook_destroy(&t->qdisc);
+cleanup_interfaces:
+	SYS_NOFAIL("ip link del %s", VETH_1);
+close_ns:
+	close_netns(t->ns);
+cleanup_ns:
+	SYS_NOFAIL("ip netns del %s", TEST_NS);
+fail:
+	return 1;
+}
+
+static void cleanup_network(struct test_data *t)
+{
+	bpf_tc_detach(&t->qdisc, &t->tc_attach);
+	bpf_tc_hook_destroy(&t->qdisc);
+	/* Deleting first interface will also delete peer interface */
+	SYS_NOFAIL("ip link del %s", VETH_1);
+	close_netns(t->ns);
+	SYS_NOFAIL("ip netns del %s", TEST_NS);
+}
+
+static void check_ancestors_ids(struct test_data *t)
+{
+	__u64 expected_ids[NUM_CGROUP_LEVELS];
+	char assert_name[MAX_ASSERT_NAME];
+	__u32 level;
+
+	expected_ids[0] = get_cgroup_id("/.."); /* root cgroup */
+	expected_ids[1] = get_cgroup_id("");
+	expected_ids[2] = get_cgroup_id(CGROUP_PATH);
+	expected_ids[3] = 0; /* non-existent cgroup */
+
+	for (level = 0; level < NUM_CGROUP_LEVELS; level++) {
+		snprintf(assert_name, MAX_ASSERT_NAME,
+			 "ancestor id at level %d", level);
+		ASSERT_EQ(t->skel->bss->cgroup_ids[level], expected_ids[level],
+			  assert_name);
+	}
+}
+
+void test_cgroup_ancestor(void)
+{
+	struct test_data t;
+	int cgroup_fd;
+
+	t.skel = cgroup_ancestor__open_and_load();
+	if (!ASSERT_OK_PTR(t.skel, "open and load"))
+		return;
+
+	cgroup_fd = cgroup_setup_and_join(CGROUP_PATH);
+	if (cgroup_fd < 0)
+		goto cleanup_progs;
+
+	if (setup_network(&t))
+		goto cleanup_cgroups;
+
+	if (send_datagram())
+		goto cleanup_network;
+
+	check_ancestors_ids(&t);
+
+cleanup_network:
+	cleanup_network(&t);
+cleanup_cgroups:
+	close(cgroup_fd);
+	cleanup_cgroup_environment();
+cleanup_progs:
+	cgroup_ancestor__destroy(t.skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/cgroup_ancestor.c b/tools/testing/selftests/bpf/progs/cgroup_ancestor.c
index 4879645f5827..23c2e63e77a2 100644
--- a/tools/testing/selftests/bpf/progs/cgroup_ancestor.c
+++ b/tools/testing/selftests/bpf/progs/cgroup_ancestor.c
@@ -10,22 +10,14 @@
 
 #define NUM_CGROUP_LEVELS	4
 
-struct {
-	__uint(type, BPF_MAP_TYPE_ARRAY);
-	__type(key, __u32);
-	__type(value, __u64);
-	__uint(max_entries, NUM_CGROUP_LEVELS);
-} cgroup_ids SEC(".maps");
+__u64 cgroup_ids[NUM_CGROUP_LEVELS];
 
 static __always_inline void log_nth_level(struct __sk_buff *skb, __u32 level)
 {
-	__u64 id;
-
 	/* [1] &level passed to external function that may change it, it's
 	 *     incompatible with loop unroll.
 	 */
-	id = bpf_skb_ancestor_cgroup_id(skb, level);
-	bpf_map_update_elem(&cgroup_ids, &level, &id, 0);
+	cgroup_ids[level] = bpf_skb_ancestor_cgroup_id(skb, level);
 }
 
 SEC("tc")
diff --git a/tools/testing/selftests/bpf/test_skb_cgroup_id.sh b/tools/testing/selftests/bpf/test_skb_cgroup_id.sh
deleted file mode 100755
index d7dad49175c2..000000000000
--- a/tools/testing/selftests/bpf/test_skb_cgroup_id.sh
+++ /dev/null
@@ -1,67 +0,0 @@
-#!/bin/sh
-# SPDX-License-Identifier: GPL-2.0
-# Copyright (c) 2018 Facebook
-
-set -eu
-
-wait_for_ip()
-{
-	local _i
-	echo -n "Wait for testing link-local IP to become available "
-	for _i in $(seq ${MAX_PING_TRIES}); do
-		echo -n "."
-		if $PING6 -c 1 -W 1 ff02::1%${TEST_IF} >/dev/null 2>&1; then
-			echo " OK"
-			return
-		fi
-		sleep 1
-	done
-	echo 1>&2 "ERROR: Timeout waiting for test IP to become available."
-	exit 1
-}
-
-setup()
-{
-	# Create testing interfaces not to interfere with current environment.
-	ip link add dev ${TEST_IF} type veth peer name ${TEST_IF_PEER}
-	ip link set ${TEST_IF} up
-	ip link set ${TEST_IF_PEER} up
-
-	wait_for_ip
-
-	tc qdisc add dev ${TEST_IF} clsact
-	mkdir -p /sys/fs/bpf/${BPF_PROG_PIN}
-	bpftool prog loadall ${BPF_PROG_OBJ} /sys/fs/bpf/${BPF_PROG_PIN} type tc
-	tc filter add dev ${TEST_IF} egress bpf da object-pinned \
-		/sys/fs/bpf/${BPF_PROG_PIN}/${BPF_PROG_NAME}
-
-	BPF_PROG_ID=$(tc filter show dev ${TEST_IF} egress | \
-			awk '/ id / {sub(/.* id /, "", $0); print($1)}')
-}
-
-cleanup()
-{
-	ip link del ${TEST_IF} 2>/dev/null || :
-	ip link del ${TEST_IF_PEER} 2>/dev/null || :
-	rm -rf /sys/fs/bpf/${BPF_PROG_PIN}
-}
-
-main()
-{
-	trap cleanup EXIT 2 3 6 15
-	setup
-	${PROG} ${TEST_IF} ${BPF_PROG_ID}
-}
-
-DIR=$(dirname $0)
-TEST_IF="test_cgid_1"
-TEST_IF_PEER="test_cgid_2"
-MAX_PING_TRIES=5
-BPF_PROG_PIN="cgroup_ancestor"
-BPF_PROG_OBJ="${DIR}/${BPF_PROG_PIN}.bpf.o"
-BPF_PROG_NAME="log_cgroup_id"
-BPF_PROG_ID=0
-PROG="${DIR}/test_skb_cgroup_id_user"
-type ping6 >/dev/null 2>&1 && PING6="ping6" || PING6="ping -6"
-
-main
diff --git a/tools/testing/selftests/bpf/test_skb_cgroup_id_user.c b/tools/testing/selftests/bpf/test_skb_cgroup_id_user.c
deleted file mode 100644
index ed518d075d1d..000000000000
--- a/tools/testing/selftests/bpf/test_skb_cgroup_id_user.c
+++ /dev/null
@@ -1,183 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (c) 2018 Facebook
-
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <arpa/inet.h>
-#include <net/if.h>
-#include <netinet/in.h>
-#include <sys/socket.h>
-#include <sys/types.h>
-
-
-#include <bpf/bpf.h>
-#include <bpf/libbpf.h>
-
-#include "cgroup_helpers.h"
-
-#define CGROUP_PATH		"/skb_cgroup_test"
-#define NUM_CGROUP_LEVELS	4
-
-/* RFC 4291, Section 2.7.1 */
-#define LINKLOCAL_MULTICAST	"ff02::1"
-
-static int mk_dst_addr(const char *ip, const char *iface,
-		       struct sockaddr_in6 *dst)
-{
-	memset(dst, 0, sizeof(*dst));
-
-	dst->sin6_family = AF_INET6;
-	dst->sin6_port = htons(1025);
-
-	if (inet_pton(AF_INET6, ip, &dst->sin6_addr) != 1) {
-		log_err("Invalid IPv6: %s", ip);
-		return -1;
-	}
-
-	dst->sin6_scope_id = if_nametoindex(iface);
-	if (!dst->sin6_scope_id) {
-		log_err("Failed to get index of iface: %s", iface);
-		return -1;
-	}
-
-	return 0;
-}
-
-static int send_packet(const char *iface)
-{
-	struct sockaddr_in6 dst;
-	char msg[] = "msg";
-	int err = 0;
-	int fd = -1;
-
-	if (mk_dst_addr(LINKLOCAL_MULTICAST, iface, &dst))
-		goto err;
-
-	fd = socket(AF_INET6, SOCK_DGRAM, 0);
-	if (fd == -1) {
-		log_err("Failed to create UDP socket");
-		goto err;
-	}
-
-	if (sendto(fd, &msg, sizeof(msg), 0, (const struct sockaddr *)&dst,
-		   sizeof(dst)) == -1) {
-		log_err("Failed to send datagram");
-		goto err;
-	}
-
-	goto out;
-err:
-	err = -1;
-out:
-	if (fd >= 0)
-		close(fd);
-	return err;
-}
-
-int get_map_fd_by_prog_id(int prog_id)
-{
-	struct bpf_prog_info info = {};
-	__u32 info_len = sizeof(info);
-	__u32 map_ids[1];
-	int prog_fd = -1;
-	int map_fd = -1;
-
-	prog_fd = bpf_prog_get_fd_by_id(prog_id);
-	if (prog_fd < 0) {
-		log_err("Failed to get fd by prog id %d", prog_id);
-		goto err;
-	}
-
-	info.nr_map_ids = 1;
-	info.map_ids = (__u64) (unsigned long) map_ids;
-
-	if (bpf_prog_get_info_by_fd(prog_fd, &info, &info_len)) {
-		log_err("Failed to get info by prog fd %d", prog_fd);
-		goto err;
-	}
-
-	if (!info.nr_map_ids) {
-		log_err("No maps found for prog fd %d", prog_fd);
-		goto err;
-	}
-
-	map_fd = bpf_map_get_fd_by_id(map_ids[0]);
-	if (map_fd < 0)
-		log_err("Failed to get fd by map id %d", map_ids[0]);
-err:
-	if (prog_fd >= 0)
-		close(prog_fd);
-	return map_fd;
-}
-
-int check_ancestor_cgroup_ids(int prog_id)
-{
-	__u64 actual_ids[NUM_CGROUP_LEVELS], expected_ids[NUM_CGROUP_LEVELS];
-	__u32 level;
-	int err = 0;
-	int map_fd;
-
-	expected_ids[0] = get_cgroup_id("/..");	/* root cgroup */
-	expected_ids[1] = get_cgroup_id("");
-	expected_ids[2] = get_cgroup_id(CGROUP_PATH);
-	expected_ids[3] = 0; /* non-existent cgroup */
-
-	map_fd = get_map_fd_by_prog_id(prog_id);
-	if (map_fd < 0)
-		goto err;
-
-	for (level = 0; level < NUM_CGROUP_LEVELS; ++level) {
-		if (bpf_map_lookup_elem(map_fd, &level, &actual_ids[level])) {
-			log_err("Failed to lookup key %d", level);
-			goto err;
-		}
-		if (actual_ids[level] != expected_ids[level]) {
-			log_err("%llx (actual) != %llx (expected), level: %u\n",
-				actual_ids[level], expected_ids[level], level);
-			goto err;
-		}
-	}
-
-	goto out;
-err:
-	err = -1;
-out:
-	if (map_fd >= 0)
-		close(map_fd);
-	return err;
-}
-
-int main(int argc, char **argv)
-{
-	int cgfd = -1;
-	int err = 0;
-
-	if (argc < 3) {
-		fprintf(stderr, "Usage: %s iface prog_id\n", argv[0]);
-		exit(EXIT_FAILURE);
-	}
-
-	/* Use libbpf 1.0 API mode */
-	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
-
-	cgfd = cgroup_setup_and_join(CGROUP_PATH);
-	if (cgfd < 0)
-		goto err;
-
-	if (send_packet(argv[1]))
-		goto err;
-
-	if (check_ancestor_cgroup_ids(atoi(argv[2])))
-		goto err;
-
-	goto out;
-err:
-	err = -1;
-out:
-	close(cgfd);
-	cleanup_cgroup_environment();
-	printf("[%s]\n", err ? "FAIL" : "PASS");
-	return err;
-}

-- 
2.46.0

Re: [PATCH bpf-next v4 0/4] selftests/bpf: convert three other cgroup tests to test_progs

[patchwork-bot+netdevbpf]

Hello:

This series was applied to bpf/bpf-next.git (master)
by Martin KaFai Lau <martin.lau@kernel.org>:

On Tue, 13 Aug 2024 14:45:04 +0200 you wrote:
> Hello,
> this series brings a new set of test converted to the test_progs framework.
> Since the tests are quite small, I chose to group three tests conversion in
> the same series, but feel free to let me know if I should keep one series
> per test. The series focuses on cgroup testing and converts the following
> tests:
> - get_cgroup_id_user
> - cgroup_storage
> - test_skb_cgroup_id_user
> 
> [...]

Here is the summary with links:
  - [bpf-next,v4,1/4] selftests/bpf: convert get_current_cgroup_id_user to test_progs
    https://git.kernel.org/bpf/bpf-next/c/a4ae5c31e0f2
  - [bpf-next,v4,2/4] selftests/bpf: convert test_cgroup_storage to test_progs
    https://git.kernel.org/bpf/bpf-next/c/37a14cfd667a
  - [bpf-next,v4,3/4] selftests/bpf: add proper section name to bpf prog and rename it
    https://git.kernel.org/bpf/bpf-next/c/7b4400a0a69b
  - [bpf-next,v4,4/4] selftests/bpf: convert test_skb_cgroup_id_user to test_progs
    https://git.kernel.org/bpf/bpf-next/c/f957c230e173

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

Re: [PATCH bpf-next v4 4/4] selftests/bpf: convert test_skb_cgroup_id_user to test_progs

[Martin KaFai Lau]

On 8/13/24 5:45 AM, Alexis Lothoré (eBPF Foundation) wrote:

> +#define DST_ADDR "ff02::1"

[ ... ]

> +static int wait_local_ip(void)
> +{
> +	char *ping_cmd = ping_command(AF_INET6);
> +	int i, err;
> +
> +	for (i = 0; i < WAIT_AUTO_IP_MAX_ATTEMPT; i++) {
> +		err = SYS_NOFAIL("%s -c 1 -W 1 %s%%%s", ping_cmd, DST_ADDR,
> +				 VETH_1);

I tried in my qemu. This loop takes at least 3-4 iteration to get the ping 
through. This test could become flaky if the CI is busy.

I have been always wondering why some of the (non) test_progs has this practice.
I traced a little. I think it has something to do with the "ff02::1" used in the 
test and/or the local link address is not ready. I have not further nailed it 
down but I think it is close enough.

It will be easier to use a nodad configured v6 addr.

I take this chance to use an easier "::1" address for the test here instead of 
ff02::1. This also removed the need to add veth pair and no need to ping first.

Applied with the "::1" changes mentioned above.

Thanks for migrating the tests to test_progs. This is long overdue.




> +		if (!err)
> +			break;
> +	}
> +
> +	return err;
> +}
> +

Re: [PATCH bpf-next v4 4/4] selftests/bpf: convert test_skb_cgroup_id_user to test_progs

[Alexis Lothoré]

Hello Martin,

On 8/15/24 04:20, Martin KaFai Lau wrote:
> On 8/13/24 5:45 AM, Alexis Lothoré (eBPF Foundation) wrote:
> 
>> +#define DST_ADDR "ff02::1"
> 
> [ ... ]
> 
>> +static int wait_local_ip(void)
>> +{
>> +    char *ping_cmd = ping_command(AF_INET6);
>> +    int i, err;
>> +
>> +    for (i = 0; i < WAIT_AUTO_IP_MAX_ATTEMPT; i++) {
>> +        err = SYS_NOFAIL("%s -c 1 -W 1 %s%%%s", ping_cmd, DST_ADDR,
>> +                 VETH_1);
> 
> I tried in my qemu. This loop takes at least 3-4 iteration to get the ping
> through. This test could become flaky if the CI is busy.
> 
> I have been always wondering why some of the (non) test_progs has this practice.
> I traced a little. I think it has something to do with the "ff02::1" used in the
> test and/or the local link address is not ready. I have not further nailed it
> down but I think it is close enough.
> 
> It will be easier to use a nodad configured v6 addr.
> 
> I take this chance to use an easier "::1" address for the test here instead of
> ff02::1. This also removed the need to add veth pair and no need to ping first.
> 
> Applied with the "::1" changes mentioned above.

Thanks for the improvement. So far I tried to preserve as much as possible the
original test behavior to avoid accidentally removing some important features,
but I guess the more tests I work on, the more confident I will be to
"challenge" some parts ;)

> Thanks for migrating the tests to test_progs. This is long overdue.

For the record, the next test I am targeting is test_xdp_features.sh. I have
undertaken the conversion and have a working base but it still needs some work.

Thanks,

Alexis


-- 
Alexis Lothoré, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com