From patchwork Tue Aug 27 19:48:30 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin KaFai Lau X-Patchwork-Id: 13780104 X-Patchwork-Delegate: bpf@iogearbox.net Received: from out-180.mta0.migadu.com (out-180.mta0.migadu.com [91.218.175.180]) (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 CBB511D2F56 for ; Tue, 27 Aug 2024 19:49:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.180 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724788156; cv=none; b=oXQKjwR6izYzi0ZRU2aTJGGe8nNqAexTVPMloK2vXoyHlmMoQjigWtQTgWFqDU8kuPCH2Lgc0Bf7ZYvFhnPyO3PRZhFs3Ua4qaYm9X4GK1YXhKz/ftejNnHewAGZkpuPsEm36x7sKQaAtS4YkBW5PuRPTjwxe+rGbfbPP4C1/Mw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724788156; c=relaxed/simple; bh=P5vL0GU2GdAXpXOJZpCtJiJ41Rl5TvhlKGALkhvRpOI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=A6tOdeURBrLwvhl4XhZYFBAfFB717/X122teaD5GOSRNqZThc1zB1O26wlUD7Tnex7ez8qLLJsMnc6+rFD9Pmfwxtqc9MxErf5g4YOTeRBlkHvrIO/i7GIieJLlgG2Oa91om0NGyM7H5r29HASQa+2h2/6e3mmMdnG0ZV6VEHjU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=ankE4VHK; arc=none smtp.client-ip=91.218.175.180 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="ankE4VHK" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1724788153; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9rIum6Tlk68haTWumoIKSXGOj7KCH1RT3rD2OnSeY90=; b=ankE4VHKq5NJkJ35RG9valKLT5F4ceIvWIOrS79S894LxewfVNm4k7qke+ZTefoN7xTi/0 a9CflphgG/aRyLPcv3aBK0LbznU43gcU8foMUKhXSJuA54dGGqJUT4dDLaKGAondIbWvsj nIEPhyI2j1SWHCFvDKbBerECCinbNfI= From: Martin KaFai Lau To: bpf@vger.kernel.org Cc: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Eduard Zingerman , Yonghong Song , Amery Hung , kernel-team@meta.com Subject: [PATCH v4 bpf-next 7/9] selftests/bpf: Add tailcall epilogue test Date: Tue, 27 Aug 2024 12:48:30 -0700 Message-ID: <20240827194834.1423815-8-martin.lau@linux.dev> In-Reply-To: <20240827194834.1423815-1-martin.lau@linux.dev> References: <20240827194834.1423815-1-martin.lau@linux.dev> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-Patchwork-Delegate: bpf@iogearbox.net From: Martin KaFai Lau This patch adds a gen_epilogue test to test a main prog using a bpf_tail_call. A non test_loader test is used. The tailcall target program, "test_epilogue_subprog", needs to be used in a struct_ops map before it can be loaded. Another struct_ops map is also needed to host the actual "test_epilogue_tailcall" struct_ops program that does the bpf_tail_call. The earlier test_loader patch will attach all struct_ops maps but the bpf_testmod.c does not support >1 attached struct_ops. The earlier patch used the test_loader which has already covered checking for the patched pro/epilogue instructions. This is done by the __xlated tag. This patch goes for the regular skel load and syscall test to do the tailcall test that can also allow to directly pass the the "struct st_ops_args *args" as ctx_in to the SEC("syscall") program. Signed-off-by: Martin KaFai Lau Acked-by: Eduard Zingerman --- .../selftests/bpf/prog_tests/pro_epilogue.c | 38 ++++++++++++ .../selftests/bpf/progs/epilogue_tailcall.c | 58 +++++++++++++++++++ 2 files changed, 96 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/epilogue_tailcall.c diff --git a/tools/testing/selftests/bpf/prog_tests/pro_epilogue.c b/tools/testing/selftests/bpf/prog_tests/pro_epilogue.c index 69e4a5a1756d..98de677c55a9 100644 --- a/tools/testing/selftests/bpf/prog_tests/pro_epilogue.c +++ b/tools/testing/selftests/bpf/prog_tests/pro_epilogue.c @@ -4,9 +4,47 @@ #include #include "pro_epilogue_subprog.skel.h" #include "pro_epilogue_kfunc.skel.h" +#include "epilogue_tailcall.skel.h" + +struct st_ops_args { + int a; +}; + +static void test_tailcall(void) +{ + LIBBPF_OPTS(bpf_test_run_opts, topts); + struct epilogue_tailcall *skel; + struct st_ops_args args; + int err, prog_fd; + + skel = epilogue_tailcall__open_and_load(); + if (!ASSERT_OK_PTR(skel, "epilogue_tailcall__open_and_load")) + return; + + topts.ctx_in = &args; + topts.ctx_size_in = sizeof(args); + + skel->links.epilogue_tailcall = + bpf_map__attach_struct_ops(skel->maps.epilogue_tailcall); + if (!ASSERT_OK_PTR(skel->links.epilogue_tailcall, "attach_struct_ops")) + goto done; + + /* tailcall prog + gen_epilogue */ + memset(&args, 0, sizeof(args)); + prog_fd = bpf_program__fd(skel->progs.syscall_epilogue_tailcall); + err = bpf_prog_test_run_opts(prog_fd, &topts); + ASSERT_OK(err, "bpf_prog_test_run_opts"); + ASSERT_EQ(args.a, 10001, "args.a"); + ASSERT_EQ(topts.retval, 10001 * 2, "topts.retval"); + +done: + epilogue_tailcall__destroy(skel); +} void test_pro_epilogue(void) { RUN_TESTS(pro_epilogue_subprog); RUN_TESTS(pro_epilogue_kfunc); + if (test__start_subtest("tailcall")) + test_tailcall(); } diff --git a/tools/testing/selftests/bpf/progs/epilogue_tailcall.c b/tools/testing/selftests/bpf/progs/epilogue_tailcall.c new file mode 100644 index 000000000000..7275dd594de0 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/epilogue_tailcall.c @@ -0,0 +1,58 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */ + +#include +#include +#include "bpf_misc.h" +#include "../bpf_testmod/bpf_testmod.h" +#include "../bpf_testmod/bpf_testmod_kfunc.h" + +char _license[] SEC("license") = "GPL"; + +static __noinline __used int subprog(struct st_ops_args *args) +{ + args->a += 1; + return args->a; +} + +SEC("struct_ops/test_epilogue_subprog") +int BPF_PROG(test_epilogue_subprog, struct st_ops_args *args) +{ + subprog(args); + return args->a; +} + +struct { + __uint(type, BPF_MAP_TYPE_PROG_ARRAY); + __uint(max_entries, 1); + __uint(key_size, sizeof(__u32)); + __uint(value_size, sizeof(__u32)); + __array(values, void (void)); +} epilogue_map SEC(".maps") = { + .values = { + [0] = (void *)&test_epilogue_subprog, + } +}; + +SEC("struct_ops/test_epilogue_tailcall") +int test_epilogue_tailcall(unsigned long long *ctx) +{ + bpf_tail_call(ctx, &epilogue_map, 0); + return 0; +} + +SEC(".struct_ops.link") +struct bpf_testmod_st_ops epilogue_tailcall = { + .test_epilogue = (void *)test_epilogue_tailcall, +}; + +SEC(".struct_ops.link") +struct bpf_testmod_st_ops epilogue_subprog = { + .test_epilogue = (void *)test_epilogue_subprog, +}; + +SEC("syscall") +int syscall_epilogue_tailcall(struct st_ops_args *args) +{ + return bpf_kfunc_st_ops_test_epilogue(args); +}