From patchwork Mon Apr 8 08:09:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 13620718 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8727550261; Mon, 8 Apr 2024 08:10:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712563814; cv=none; b=BkH3oZyv5kE793ikygLvdYCBB39oQ/uPi245+Hxj9S6Bh9oVMRhzxgDF3vfqafo61/m2iagPeDtWG16fO1L1WXC6qgBAdl5B+P0F17dZOIW3MRi5W6Kfyofh75nSTO10mF7/EIrLonvDf3LiJE4gLTTzDrz+sPrI8sfSpRv+txk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712563814; c=relaxed/simple; bh=VK5TMS1RBt4n3wTN5emOMrl/EafXnUKW81ujAeZ/zaQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=tKUNF/gM7iua3JR3zZadGJ2E0Iqs15tKvComVVnQYiMzECnrhG0Z21jWCd8GasKndFk7YGF80q/3S/OGFgQYaJhHwzoMmsy0dZ9gUgJGbQZx4AQcTjaJFqeGDRwf+oFwh7GR0B2IMLPTLsJZS9NrjFWWRNMy+TZOyrhiCj5C6cc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=aly/g6MA; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="aly/g6MA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CD2F1C433C7; Mon, 8 Apr 2024 08:10:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1712563814; bh=VK5TMS1RBt4n3wTN5emOMrl/EafXnUKW81ujAeZ/zaQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=aly/g6MAD0Joz022TK5sZ9ySr8NS3Gg2ZjmhgV9eUlJJq2Th/WS1AvTi0gHlnqWAD M7z1TjSgkjqnnf8o80InKUs1yDnwvKB0ZtgMxDdSbL59po7T4zGGw7xsKd5zErHN+M AwzoDToAUCDwxJwkxwhS/Tz2lOEc2Dz/IDfN3FQoyuXHTeXM8DxFZzyORFxcDsU+JZ +PMKfmVf9TPJJP7THWRxp2Adt4qHJBJQzriHT+Tf9mbsgTJ+GmRw5dDP1s35yLYAJg zzXpQmwlSSrvMEDoF8rpyBRt0MVRNqXmbrDybjuNAKafjNFinJZj8OZzpYhkefd4ls lmuNsrdOsIrEQ== From: Benjamin Tissoires Date: Mon, 08 Apr 2024 10:09:31 +0200 Subject: [PATCH RFC bpf-next v6 6/6] selftests/bpf: add sleepable timer tests Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240408-hid-bpf-sleepable-v6-6-0499ddd91b94@kernel.org> References: <20240408-hid-bpf-sleepable-v6-0-0499ddd91b94@kernel.org> In-Reply-To: <20240408-hid-bpf-sleepable-v6-0-0499ddd91b94@kernel.org> To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Mykola Lysenko , Shuah Khan Cc: Benjamin Tissoires , bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=ed25519-sha256; t=1712563787; l=10863; i=bentiss@kernel.org; s=20230215; h=from:subject:message-id; bh=VK5TMS1RBt4n3wTN5emOMrl/EafXnUKW81ujAeZ/zaQ=; b=DkDztKSSM7lLUnbAHdGqP2rfKfHFrniK23AmOurdhWu2n1ngDjhSbKcRfGY08H+huRvSX8YNF DafjdkIw+xHDY0WMCUKiwZoi0dO0lrq27KPkm5BiTlAhm39gffESED5 X-Developer-Key: i=bentiss@kernel.org; a=ed25519; pk=7D1DyAVh6ajCkuUTudt/chMuXWIJHlv2qCsRkIizvFw= bpf_experimental.h and ../bpf_testmod/bpf_testmod_kfunc.h are both including vmlinux.h, which is not compatible with including time.h or bpf_tcp_helpers.h. So keep sleepable tests in a separate bpf source file. The first correct test is run twice for convenience: - first through RUN_TESTS - then we ensure that the timer was actually executed, in a manual load/attach/run Signed-off-by: Benjamin Tissoires Acked-by: Eduard Zingerman --- changes in v6: - use of new _init API with BPF_F_TIMER_SLEEPABLE changes in v5b: - do not use SEC(syscall) as they are run in a sleepable context already - duplicate test_call_sleepable() so we can test if the callback gets called changes in v5: - keep sleepable test separate new in v4 --- tools/testing/selftests/bpf/bpf_experimental.h | 5 + .../selftests/bpf/bpf_testmod/bpf_testmod.c | 5 + .../selftests/bpf/bpf_testmod/bpf_testmod_kfunc.h | 1 + tools/testing/selftests/bpf/prog_tests/timer.c | 34 ++++ .../testing/selftests/bpf/progs/timer_sleepable.c | 213 +++++++++++++++++++++ 5 files changed, 258 insertions(+) diff --git a/tools/testing/selftests/bpf/bpf_experimental.h b/tools/testing/selftests/bpf/bpf_experimental.h index a5b9df38c162..06ed98b3bc51 100644 --- a/tools/testing/selftests/bpf/bpf_experimental.h +++ b/tools/testing/selftests/bpf/bpf_experimental.h @@ -459,4 +459,9 @@ extern int bpf_iter_css_new(struct bpf_iter_css *it, extern struct cgroup_subsys_state *bpf_iter_css_next(struct bpf_iter_css *it) __weak __ksym; extern void bpf_iter_css_destroy(struct bpf_iter_css *it) __weak __ksym; +extern int bpf_timer_set_sleepable_cb_impl(struct bpf_timer *timer, + int (callback_fn)(void *map, int *key, struct bpf_timer *timer), + void *aux__ign) __ksym; +#define bpf_timer_set_sleepable_cb(timer, cb) \ + bpf_timer_set_sleepable_cb_impl(timer, cb, NULL) #endif diff --git a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c index 39ad96a18123..eb2b78552ca2 100644 --- a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c +++ b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c @@ -494,6 +494,10 @@ __bpf_kfunc static u32 bpf_kfunc_call_test_static_unused_arg(u32 arg, u32 unused return arg; } +__bpf_kfunc void bpf_kfunc_call_test_sleepable(void) +{ +} + BTF_KFUNCS_START(bpf_testmod_check_kfunc_ids) BTF_ID_FLAGS(func, bpf_testmod_test_mod_kfunc) BTF_ID_FLAGS(func, bpf_kfunc_call_test1) @@ -520,6 +524,7 @@ BTF_ID_FLAGS(func, bpf_kfunc_call_test_ref, KF_TRUSTED_ARGS | KF_RCU) BTF_ID_FLAGS(func, bpf_kfunc_call_test_destructive, KF_DESTRUCTIVE) BTF_ID_FLAGS(func, bpf_kfunc_call_test_static_unused_arg) BTF_ID_FLAGS(func, bpf_kfunc_call_test_offset) +BTF_ID_FLAGS(func, bpf_kfunc_call_test_sleepable, KF_SLEEPABLE) BTF_KFUNCS_END(bpf_testmod_check_kfunc_ids) static int bpf_testmod_ops_init(struct btf *btf) diff --git a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod_kfunc.h b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod_kfunc.h index 7c664dd61059..ce5cd763561c 100644 --- a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod_kfunc.h +++ b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod_kfunc.h @@ -96,6 +96,7 @@ void bpf_kfunc_call_test_pass2(struct prog_test_pass2 *p) __ksym; void bpf_kfunc_call_test_mem_len_fail2(__u64 *mem, int len) __ksym; void bpf_kfunc_call_test_destructive(void) __ksym; +void bpf_kfunc_call_test_sleepable(void) __ksym; void bpf_kfunc_call_test_offset(struct prog_test_ref_kfunc *p); struct prog_test_member *bpf_kfunc_call_memb_acquire(void); diff --git a/tools/testing/selftests/bpf/prog_tests/timer.c b/tools/testing/selftests/bpf/prog_tests/timer.c index d66687f1ee6a..c6c7c623b31c 100644 --- a/tools/testing/selftests/bpf/prog_tests/timer.c +++ b/tools/testing/selftests/bpf/prog_tests/timer.c @@ -3,6 +3,7 @@ #include #include "timer.skel.h" #include "timer_failure.skel.h" +#include "timer_sleepable.skel.h" #define NUM_THR 8 @@ -95,3 +96,36 @@ void serial_test_timer(void) RUN_TESTS(timer_failure); } + +/* isolate sleepable tests from main timer tests + * because if test_timer fails, it spews the console + * with 10000 * 5 "spin_lock_thread:PASS:test_run_opts retval 0 nsec" + */ +void serial_test_sleepable_timer(void) +{ + struct timer_sleepable *timer_sleepable_skel = NULL; + int err, prog_fd; + + LIBBPF_OPTS(bpf_test_run_opts, topts); + + RUN_TESTS(timer_sleepable); + + /* re-run the success test to check if the timer was actually executed */ + + timer_sleepable_skel = timer_sleepable__open_and_load(); + if (!ASSERT_OK_PTR(timer_sleepable_skel, "timer_sleepable_skel_load")) + return; + + err = timer_sleepable__attach(timer_sleepable_skel); + if (!ASSERT_OK(err, "timer_sleepable_attach")) + return; + + prog_fd = bpf_program__fd(timer_sleepable_skel->progs.test_syscall_sleepable); + err = bpf_prog_test_run_opts(prog_fd, &topts); + ASSERT_OK(err, "test_run"); + ASSERT_EQ(topts.retval, 0, "test_run"); + + usleep(50); /* 10 usecs should be enough, but give it extra */ + + ASSERT_EQ(timer_sleepable_skel->bss->ok_sleepable, 1, "ok_sleepable"); +} diff --git a/tools/testing/selftests/bpf/progs/timer_sleepable.c b/tools/testing/selftests/bpf/progs/timer_sleepable.c new file mode 100644 index 000000000000..fc7829d8b6c4 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/timer_sleepable.c @@ -0,0 +1,213 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2021 Facebook + * Copyright (c) 2024 Benjamin Tissoires + */ + +#include "bpf_experimental.h" +#include +#include "bpf_misc.h" +#include "../bpf_testmod/bpf_testmod_kfunc.h" + +char _license[] SEC("license") = "GPL"; + +#define CLOCK_MONOTONIC 1 + +struct elem { + struct bpf_timer t; +}; + +struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __uint(max_entries, 3); + __type(key, int); + __type(value, struct elem); +} timer_map SEC(".maps"); + +__u32 ok_sleepable; + +/* callback for sleepable timer */ +static int timer_cb_sleepable(void *map, int *key, struct bpf_timer *timer) +{ + bpf_kfunc_call_test_sleepable(); + ok_sleepable |= (1 << *key); + return 0; +} + +SEC("tc") +/* check that calling bpf_timer_start() with BPF_F_TIMER_SLEEPABLE on a sleepable + * callback works + */ +__retval(0) +long test_call_sleepable(void *ctx) +{ + int key = 0; + struct bpf_timer *timer; + + if (ok_sleepable & 1) + return -1; + + timer = bpf_map_lookup_elem(&timer_map, &key); + if (timer) { + if (bpf_timer_init(timer, &timer_map, CLOCK_MONOTONIC | BPF_F_TIMER_SLEEPABLE) != 0) + return -2; + bpf_timer_set_sleepable_cb(timer, timer_cb_sleepable); + if (bpf_timer_start(timer, 0, 0)) + return -3; + } else { + return -4; + } + + return 0; +} + +SEC("syscall") +/* check that calling bpf_timer_start() with BPF_F_TIMER_SLEEPABLE on a sleepable + * callback works. + */ +__retval(0) +long test_syscall_sleepable(void *ctx) +{ + int key = 0; + struct bpf_timer *timer; + + if (ok_sleepable & 1) + return -1; + + timer = bpf_map_lookup_elem(&timer_map, &key); + if (timer) { + if (bpf_timer_init(timer, &timer_map, CLOCK_MONOTONIC | BPF_F_TIMER_SLEEPABLE) != 0) + return -2; + bpf_timer_set_sleepable_cb(timer, timer_cb_sleepable); + if (bpf_timer_start(timer, 0, 0)) + return -3; + } else { + return -4; + } + + return 0; +} + +SEC("?tc") +__log_level(2) +__failure +/* check that bpf_timer_set_callback() can not be called with a + * sleepable callback + */ +__msg("mark_precise: frame0: regs=r1 stack= before") +__msg(": (85) call bpf_kfunc_call_test_sleepable#") /* anchor message */ +__msg("program must be sleepable to call sleepable kfunc bpf_kfunc_call_test_sleepable") +long test_non_sleepable_sleepable_callback(void *ctx) +{ + int key = 0; + struct bpf_timer *timer; + + timer = bpf_map_lookup_elem(&timer_map, &key); + if (timer) { + bpf_timer_init(timer, &timer_map, CLOCK_MONOTONIC | BPF_F_TIMER_SLEEPABLE); + bpf_timer_set_callback(timer, timer_cb_sleepable); + bpf_timer_start(timer, 0, 0); + } + + return 0; +} + +SEC("tc") +/* check that calling bpf_timer_set_sleepable_cb() without a sleepable timer + * initialized with BPF_F_TIMER_SLEEPABLE on a sleepable + * callback is returning -EINVAL + */ +__retval(3) +long test_call_sleepable_missing_flag(void *ctx) +{ + int key = 1; + struct bpf_timer *timer; + + timer = bpf_map_lookup_elem(&timer_map, &key); + if (!timer) + return 1; + + if (bpf_timer_init(timer, &timer_map, CLOCK_MONOTONIC)) + return 2; + + if (bpf_timer_set_sleepable_cb(timer, timer_cb_sleepable)) + return 3; + + return bpf_timer_start(timer, 0, 0); +} + +SEC("tc") +/* check that calling bpf_timer_start() with a delay on a sleepable + * callback is returning -EINVAL + */ +__retval(-22) +long test_call_sleepable_delay(void *ctx) +{ + int key = 2; + struct bpf_timer *timer; + + timer = bpf_map_lookup_elem(&timer_map, &key); + if (!timer) + return 1; + + if (bpf_timer_init(timer, &timer_map, CLOCK_MONOTONIC | BPF_F_TIMER_SLEEPABLE)) + return 2; + + if (bpf_timer_set_sleepable_cb(timer, timer_cb_sleepable)) + return 3; + + return bpf_timer_start(timer, 1, 0); +} + +SEC("?tc") +__log_level(2) +__failure +/* check that the first argument of bpf_timer_set_callback() + * is a correct bpf_timer pointer. + */ +__msg("mark_precise: frame0: regs=r1 stack= before") +__msg(": (85) call bpf_timer_set_sleepable_cb_impl#") /* anchor message */ +__msg("arg#0 doesn't point to a map value") +long test_wrong_pointer(void *ctx) +{ + int key = 0; + struct bpf_timer *timer; + + timer = bpf_map_lookup_elem(&timer_map, &key); + if (!timer) + return 1; + + if (bpf_timer_init(timer, &timer_map, CLOCK_MONOTONIC | BPF_F_TIMER_SLEEPABLE)) + return 2; + + if (bpf_timer_set_sleepable_cb((void *)&timer, timer_cb_sleepable)) + return 3; + + return -22; +} + +SEC("?tc") +__log_level(2) +__failure +/* check that the first argument of bpf_timer_set_callback() + * is a correct bpf_timer pointer. + */ +__msg("mark_precise: frame0: regs=r1 stack= before") +__msg(": (85) call bpf_timer_set_sleepable_cb_impl#") /* anchor message */ +__msg("off 1 doesn't point to 'struct bpf_timer' that is at 0") +long test_wrong_pointer_offset(void *ctx) +{ + int key = 0; + struct bpf_timer *timer; + + timer = bpf_map_lookup_elem(&timer_map, &key); + if (!timer) + return 1; + + if (bpf_timer_init(timer, &timer_map, CLOCK_MONOTONIC | BPF_F_TIMER_SLEEPABLE)) + return 2; + + if (bpf_timer_set_sleepable_cb((void *)timer + 1, timer_cb_sleepable)) + return 3; + + return -22; +}