[PATCH v3 bpf-next 3/3] selftests/bpf: Add a test for kmem_cache_iter

[Namhyung Kim <namhyung@kernel.org>]

The test traverses all slab caches using the kmem_cache_iter and check
if current task's pointer is from "task_struct" slab cache.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 .../bpf/prog_tests/kmem_cache_iter.c          | 64 ++++++++++++++++++
 tools/testing/selftests/bpf/progs/bpf_iter.h  |  7 ++
 .../selftests/bpf/progs/kmem_cache_iter.c     | 66 +++++++++++++++++++
 3 files changed, 137 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/kmem_cache_iter.c
 create mode 100644 tools/testing/selftests/bpf/progs/kmem_cache_iter.c

diff --git a/tools/testing/selftests/bpf/prog_tests/kmem_cache_iter.c b/tools/testing/selftests/bpf/prog_tests/kmem_cache_iter.c
new file mode 100644
index 0000000000000000..3965e2924ac82d91
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/kmem_cache_iter.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2024 Google */
+
+#include <test_progs.h>
+#include <bpf/libbpf.h>
+#include <bpf/btf.h>
+#include "kmem_cache_iter.skel.h"
+
+static void test_kmem_cache_iter_check_task(struct kmem_cache_iter *skel)
+{
+	LIBBPF_OPTS(bpf_test_run_opts, opts,
+		.flags = 0,  /* run it with the current task */
+	);
+	int prog_fd = bpf_program__fd(skel->progs.check_task_struct);
+
+	/* get task_struct and check it if's from a slab cache */
+	bpf_prog_test_run_opts(prog_fd, &opts);
+
+	/* the BPF program should set 'found' variable */
+	ASSERT_EQ(skel->bss->found, 1, "found task_struct");
+}
+
+void test_kmem_cache_iter(void)
+{
+	DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts);
+	struct kmem_cache_iter *skel = NULL;
+	union bpf_iter_link_info linfo = {};
+	struct bpf_link *link;
+	char buf[1024];
+	int iter_fd;
+
+	skel = kmem_cache_iter__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "kmem_cache_iter__open_and_load"))
+		return;
+
+	opts.link_info = &linfo;
+	opts.link_info_len = sizeof(linfo);
+
+	link = bpf_program__attach_iter(skel->progs.slab_info_collector, &opts);
+	if (!ASSERT_OK_PTR(link, "attach_iter"))
+		goto destroy;
+
+	iter_fd = bpf_iter_create(bpf_link__fd(link));
+	if (!ASSERT_GE(iter_fd, 0, "iter_create"))
+		goto free_link;
+
+	memset(buf, 0, sizeof(buf));
+	while (read(iter_fd, buf, sizeof(buf) > 0)) {
+		/* read out all contents */
+		printf("%s", buf);
+	}
+
+	/* next reads should return 0 */
+	ASSERT_EQ(read(iter_fd, buf, sizeof(buf)), 0, "read");
+
+	test_kmem_cache_iter_check_task(skel);
+
+	close(iter_fd);
+
+free_link:
+	bpf_link__destroy(link);
+destroy:
+	kmem_cache_iter__destroy(skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/bpf_iter.h b/tools/testing/selftests/bpf/progs/bpf_iter.h
index c41ee80533ca219a..3305dc3a74b32481 100644
--- a/tools/testing/selftests/bpf/progs/bpf_iter.h
+++ b/tools/testing/selftests/bpf/progs/bpf_iter.h
@@ -24,6 +24,7 @@
 #define BTF_F_PTR_RAW BTF_F_PTR_RAW___not_used
 #define BTF_F_ZERO BTF_F_ZERO___not_used
 #define bpf_iter__ksym bpf_iter__ksym___not_used
+#define bpf_iter__kmem_cache bpf_iter__kmem_cache___not_used
 #include "vmlinux.h"
 #undef bpf_iter_meta
 #undef bpf_iter__bpf_map
@@ -48,6 +49,7 @@
 #undef BTF_F_PTR_RAW
 #undef BTF_F_ZERO
 #undef bpf_iter__ksym
+#undef bpf_iter__kmem_cache
 
 struct bpf_iter_meta {
 	struct seq_file *seq;
@@ -165,3 +167,8 @@ struct bpf_iter__ksym {
 	struct bpf_iter_meta *meta;
 	struct kallsym_iter *ksym;
 };
+
+struct bpf_iter__kmem_cache {
+	struct bpf_iter_meta *meta;
+	struct kmem_cache *s;
+} __attribute__((preserve_access_index));
diff --git a/tools/testing/selftests/bpf/progs/kmem_cache_iter.c b/tools/testing/selftests/bpf/progs/kmem_cache_iter.c
new file mode 100644
index 0000000000000000..3f6ec15a1bf6344c
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/kmem_cache_iter.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2024 Google */
+
+#include "bpf_iter.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+char _license[] SEC("license") = "GPL";
+
+#define SLAB_NAME_MAX  256
+
+struct {
+	__uint(type, BPF_MAP_TYPE_HASH);
+	__uint(key_size, sizeof(void *));
+	__uint(value_size, SLAB_NAME_MAX);
+	__uint(max_entries, 1024);
+} slab_hash SEC(".maps");
+
+extern struct kmem_cache *bpf_get_kmem_cache(__u64 addr) __ksym;
+
+/* result, will be checked by userspace */
+int found;
+
+SEC("iter/kmem_cache")
+int slab_info_collector(struct bpf_iter__kmem_cache *ctx)
+{
+	struct seq_file *seq = ctx->meta->seq;
+	struct kmem_cache *s = ctx->s;
+
+	if (s) {
+		char name[SLAB_NAME_MAX];
+
+		/*
+		 * To make sure if the slab_iter implements the seq interface
+		 * properly and it's also useful for debugging.
+		 */
+		BPF_SEQ_PRINTF(seq, "%s: %u\n", s->name, s->object_size);
+
+		bpf_probe_read_kernel_str(name, sizeof(name), s->name);
+		bpf_map_update_elem(&slab_hash, &s, name, BPF_NOEXIST);
+	}
+
+	return 0;
+}
+
+SEC("raw_tp/bpf_test_finish")
+int BPF_PROG(check_task_struct)
+{
+	__u64 curr = bpf_get_current_task();
+	struct kmem_cache *s;
+	char *name;
+
+	s = bpf_get_kmem_cache(curr);
+	if (s == NULL) {
+		found = -1;
+		return 0;
+	}
+
+	name = bpf_map_lookup_elem(&slab_hash, &s);
+	if (name && !bpf_strncmp(name, 11, "task_struct"))
+		found = 1;
+	else
+		found = -2;
+
+	return 0;
+}
-- 
2.46.1.824.gd892dcdcdd-goog