selftests/bpf: Add a test for kmem_cache_iter

The test traverses all slab caches using the kmem_cache_iter and save
the data into slab_result array map.  And check if current task's
pointer is from "task_struct" slab cache using bpf_get_kmem_cache().

Also compare the result array with /proc/slabinfo if available (when
CONFIG_SLUB_DEBUG is on).  Note that many of the fields in the slabinfo
are transient, so it only compares the name and objsize fields.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20241010232505.1339892-4-namhyung@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 115 insertions, 0 deletions

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 000000000000..848d8fc9171f
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/kmem_cache_iter.c
@@ -0,0 +1,115 @@
+// 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"
+
+#define SLAB_NAME_MAX  32
+
+struct kmem_cache_result {
+	char name[SLAB_NAME_MAX];
+	long obj_size;
+};
+
+static void subtest_kmem_cache_iter_check_task_struct(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 */
+	ASSERT_OK(bpf_prog_test_run_opts(prog_fd, &opts), "prog_test_run");
+
+	/* The BPF program should set 'found' variable */
+	ASSERT_EQ(skel->bss->task_struct_found, 1, "task_struct_found");
+}
+
+static void subtest_kmem_cache_iter_check_slabinfo(struct kmem_cache_iter *skel)
+{
+	FILE *fp;
+	int map_fd;
+	char name[SLAB_NAME_MAX];
+	unsigned long objsize;
+	char rest_of_line[1000];
+	struct kmem_cache_result r;
+	int seen = 0;
+
+	fp = fopen("/proc/slabinfo", "r");
+	if (fp == NULL) {
+		/* CONFIG_SLUB_DEBUG is not enabled */
+		return;
+	}
+
+	map_fd = bpf_map__fd(skel->maps.slab_result);
+
+	/* Ignore first two lines for header */
+	fscanf(fp, "slabinfo - version: %*d.%*d\n");
+	fscanf(fp, "# %*s %*s %*s %*s %*s %*s : %[^\n]\n", rest_of_line);
+
+	/* Compare name and objsize only - others can be changes frequently */
+	while (fscanf(fp, "%s %*u %*u %lu %*u %*u : %[^\n]\n",
+		      name, &objsize, rest_of_line) == 3) {
+		int ret = bpf_map_lookup_elem(map_fd, &seen, &r);
+
+		if (!ASSERT_OK(ret, "kmem_cache_lookup"))
+			break;
+
+		ASSERT_STREQ(r.name, name, "kmem_cache_name");
+		ASSERT_EQ(r.obj_size, objsize, "kmem_cache_objsize");
+
+		seen++;
+	}
+
+	ASSERT_EQ(skel->bss->kmem_cache_seen, seen, "kmem_cache_seen_eq");
+
+	fclose(fp);
+}
+
+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[256];
+	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");
+
+	if (test__start_subtest("check_task_struct"))
+		subtest_kmem_cache_iter_check_task_struct(skel);
+	if (test__start_subtest("check_slabinfo"))
+		subtest_kmem_cache_iter_check_slabinfo(skel);
+
+	close(iter_fd);
+
+free_link:
+	bpf_link__destroy(link);
+destroy:
+	kmem_cache_iter__destroy(skel);
+}