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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727303427; bh=F0K+S6VZ06qBNMDXblIhDt1PDc7u3rtDzvje3N0WCyk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EZsDwet5lz1zxqaEpGuxsFM2AJIGYVu0wR8Fx4aoPVtBDiXpyXhUR9ER1ai+Q1eGs 5kmLrSdWia5+BA/FXlCLaefbVT0KDVM4BPenIWg8jIGrp1Vs0j3lVqq7iX51Dwp4Yp Q+UBtdYTE7BOYfrB1xbAhHSuFnO8CTo9FPkJP+1ZjACDAHNr6VS6wcOlGN5vzibLWo kq68VeU/qIDJWg3GeM+5xE9HlOK2yPd7QWWXkT31X2QG/WBzTLEEBuRa2YS+7N3Pk0 4nIxGd/JqIn0aypxOPksiiahT/XXzdveSurDU8E1egdGUN+lI8yzg0lbIq0J6qcHOE 1vr7YVNJkG2nw== From: Namhyung Kim To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , LKML , bpf@vger.kernel.org, Andrew Morton , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Vlastimil Babka , Roman Gushchin , Hyeonggon Yoo <42.hyeyoo@gmail.com>, linux-mm@kvack.org Subject: [RFC/PATCH bpf-next 3/3] selftests/bpf: Add a test for slab_iter Date: Wed, 25 Sep 2024 15:30:23 -0700 Message-ID: <20240925223023.735947-4-namhyung@kernel.org> X-Mailer: git-send-email 2.46.0.792.g87dc391469-goog In-Reply-To: <20240925223023.735947-1-namhyung@kernel.org> References: <20240925223023.735947-1-namhyung@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Stat-Signature: 1hwfj531kee5gehgf3qgffbkhr1exkbf X-Rspamd-Queue-Id: 8540840018 X-Rspamd-Server: rspam02 X-HE-Tag: 1727303428-662593 X-HE-Meta: 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 368JP5Cq VZ60rkkCFrtxUWTCHYL/aWcZJ0T9SKF78v0KsLhoPyxGBiinsS3Rb+lc2OYXvVeMKmlkB8Nmq2lZbk21ZSlLMG6Y86oyzm5fkCnrzbiErbnC7LgF0HWDBZi/YuQCifW5ssqp96EmLIs/haVoIQONYxbXGeInSTZgItO8fHiNpllE3ad/acBQsmP5gB8zqWcy0S8DwfhE9sTEnfX0Ioy3os/iBY2YIMt/6WNDjTk2phwVFlDrqcQ+hVyq24AmUvkeUOnazmII6Kzkhuv/mXYO8huf0tuADwJnK9L7jRMOFNdjqRALiiAWC2DKtv/ZNRnNPQApVqngzZ+NKjNCUGJc7uVohDvtcDciLyu/Zc1v+94Iy6nd+TPUjoBEMzaPPOzXZNZXNZDAhaeTT+R8= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The test traverses all slab caches using the slab_iter and check if current task's pointer is from "task_struct" slab cache. Signed-off-by: Namhyung Kim --- .../selftests/bpf/prog_tests/slab_iter.c | 64 +++++++++++++++++++ tools/testing/selftests/bpf/progs/bpf_iter.h | 7 ++ tools/testing/selftests/bpf/progs/slab_iter.c | 62 ++++++++++++++++++ 3 files changed, 133 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/slab_iter.c create mode 100644 tools/testing/selftests/bpf/progs/slab_iter.c diff --git a/tools/testing/selftests/bpf/prog_tests/slab_iter.c b/tools/testing/selftests/bpf/prog_tests/slab_iter.c new file mode 100644 index 0000000000000000..e461f6e703d67dc8 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/slab_iter.c @@ -0,0 +1,64 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2024 Google */ + +#include +#include +#include +#include "slab_iter.skel.h" + +static void test_slab_iter_check_task(struct slab_iter *skel) +{ + LIBBPF_OPTS(bpf_test_run_opts, opts, + .flags = BPF_F_TEST_RUN_ON_CPU, + ); + 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_slab_iter(void) +{ + DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts); + struct slab_iter *skel = NULL; + union bpf_iter_link_info linfo = {}; + struct bpf_link *link; + char buf[1024]; + int iter_fd; + + skel = slab_iter__open_and_load(); + if (!ASSERT_OK_PTR(skel, "slab_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_slab_iter_check_task(skel); + + close(iter_fd); + +free_link: + bpf_link__destroy(link); +destroy: + slab_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..33ea7181e1f03560 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__slab bpf_iter__slab___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__slab 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__slab { + struct bpf_iter_meta *meta; + struct kmem_cache *s; +} __attribute__((preserve_access_index)); diff --git a/tools/testing/selftests/bpf/progs/slab_iter.c b/tools/testing/selftests/bpf/progs/slab_iter.c new file mode 100644 index 0000000000000000..f806365506851774 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/slab_iter.c @@ -0,0 +1,62 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2024 Google */ + +#include "bpf_iter.h" +#include +#include + +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_slab_cache(__u64 addr) __ksym; + +/* result, will be checked by userspace */ +int found; + +SEC("iter/slab") +int slab_info_collector(struct bpf_iter__slab *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_slab_cache(curr); + if (s == NULL) + return 0; + + name = bpf_map_lookup_elem(&slab_hash, &s); + if (name && !bpf_strncmp(name, 11, "task_struct")) + found = 1; + + return 0; +} -- 2.46.0.792.g87dc391469-goog