From patchwork Wed Aug 31 15:26:46 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yonghong Song X-Patchwork-Id: 12960867 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 19415ECAAD4 for ; Wed, 31 Aug 2022 15:26:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231415AbiHaP04 (ORCPT ); Wed, 31 Aug 2022 11:26:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44908 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231393AbiHaP0z (ORCPT ); Wed, 31 Aug 2022 11:26:55 -0400 Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CCF3CD7D22 for ; Wed, 31 Aug 2022 08:26:54 -0700 (PDT) Received: from pps.filterd (m0044012.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 27VEhAAn031631 for ; Wed, 31 Aug 2022 08:26:54 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=Ykg+0GYpl2cJ4uvzmvvMjqpS5RGAGHKbLyF6fJH22OE=; b=aE03PVs9uGBaUj0qxHG6u4DscI4+aAFBvnw9u9IxHYLCVqe0fqTO2o17lE8rLMY6MqTx 9W4qPIkocESfzqWS/840qUjYIPc5ZW/3MO5ouFyzBH9YfXftK0Am79Q5U+XyzFBNQ0Fb JgS0oMw+w7ixMKPEa2XbTdFZ4nksI+Y/xYc= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3j9a6jahxp-4 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 31 Aug 2022 08:26:54 -0700 Received: from twshared2273.16.frc2.facebook.com (2620:10d:c085:208::11) by mail.thefacebook.com (2620:10d:c085:11d::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Wed, 31 Aug 2022 08:26:53 -0700 Received: by devbig309.ftw3.facebook.com (Postfix, from userid 128203) id D508FECDECBD; Wed, 31 Aug 2022 08:26:46 -0700 (PDT) From: Yonghong Song To: CC: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Subject: [PATCH bpf-next v4 1/8] bpf: Allow struct argument in trampoline based programs Date: Wed, 31 Aug 2022 08:26:46 -0700 Message-ID: <20220831152646.2078089-1-yhs@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220831152641.2077476-1-yhs@fb.com> References: <20220831152641.2077476-1-yhs@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: 9l4D81NUf4PPURHWwmS2gEYUvhHJEzrx X-Proofpoint-GUID: 9l4D81NUf4PPURHWwmS2gEYUvhHJEzrx X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-31_09,2022-08-31_03,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Allow struct argument in trampoline based programs where the struct size should be <= 16 bytes. In such cases, the argument will be put into up to 2 registers for bpf, x86_64 and arm64 architectures. To support arch-specific trampoline manipulation, add arg_flags for additional struct information about arguments in btf_func_model. Such information will be used in arch specific function arch_prepare_bpf_trampoline() to prepare argument access properly in trampoline. Signed-off-by: Yonghong Song --- include/linux/bpf.h | 4 ++++ kernel/bpf/btf.c | 45 +++++++++++++++++++++++++++++++++++++++------ 2 files changed, 43 insertions(+), 6 deletions(-) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 9c1674973e03..4d32f125f4af 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -727,10 +727,14 @@ enum bpf_cgroup_storage_type { */ #define MAX_BPF_FUNC_REG_ARGS 5 +/* The argument is a structure. */ +#define BTF_FMODEL_STRUCT_ARG BIT(0) + struct btf_func_model { u8 ret_size; u8 nr_args; u8 arg_size[MAX_BPF_FUNC_ARGS]; + u8 arg_flags[MAX_BPF_FUNC_ARGS]; }; /* Restore arguments before returning from trampoline to let original function diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 903719b89238..ea94527e5d70 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -5328,6 +5328,34 @@ static bool is_int_ptr(struct btf *btf, const struct btf_type *t) return btf_type_is_int(t); } +static u32 get_ctx_arg_idx(struct btf *btf, const struct btf_type *func_proto, + int off) +{ + const struct btf_param *args; + const struct btf_type *t; + u32 offset = 0, nr_args; + int i; + + if (!func_proto) + return off / 8; + + nr_args = btf_type_vlen(func_proto); + args = (const struct btf_param *)(func_proto + 1); + for (i = 0; i < nr_args; i++) { + t = btf_type_skip_modifiers(btf, args[i].type, NULL); + offset += btf_type_is_ptr(t) ? 8 : roundup(t->size, 8); + if (off < offset) + return i; + } + + t = btf_type_skip_modifiers(btf, func_proto->type, NULL); + offset += btf_type_is_ptr(t) ? 8 : roundup(t->size, 8); + if (off < offset) + return nr_args; + + return nr_args + 1; +} + bool btf_ctx_access(int off, int size, enum bpf_access_type type, const struct bpf_prog *prog, struct bpf_insn_access_aux *info) @@ -5347,7 +5375,7 @@ bool btf_ctx_access(int off, int size, enum bpf_access_type type, tname, off); return false; } - arg = off / 8; + arg = get_ctx_arg_idx(btf, t, off); args = (const struct btf_param *)(t + 1); /* if (t == NULL) Fall back to default BPF prog with * MAX_BPF_FUNC_REG_ARGS u64 arguments. @@ -5417,7 +5445,7 @@ bool btf_ctx_access(int off, int size, enum bpf_access_type type, /* skip modifiers */ while (btf_type_is_modifier(t)) t = btf_type_by_id(btf, t->type); - if (btf_type_is_small_int(t) || btf_is_any_enum(t)) + if (btf_type_is_small_int(t) || btf_is_any_enum(t) || __btf_type_is_struct(t)) /* accessing a scalar */ return true; if (!btf_type_is_ptr(t)) { @@ -5881,7 +5909,7 @@ static int __get_type_size(struct btf *btf, u32 btf_id, if (btf_type_is_ptr(t)) /* kernel size of pointer. Not BPF's size of pointer*/ return sizeof(void *); - if (btf_type_is_int(t) || btf_is_any_enum(t)) + if (btf_type_is_int(t) || btf_is_any_enum(t) || __btf_type_is_struct(t)) return t->size; return -EINVAL; } @@ -5901,8 +5929,10 @@ int btf_distill_func_proto(struct bpf_verifier_log *log, /* BTF function prototype doesn't match the verifier types. * Fall back to MAX_BPF_FUNC_REG_ARGS u64 args. */ - for (i = 0; i < MAX_BPF_FUNC_REG_ARGS; i++) + for (i = 0; i < MAX_BPF_FUNC_REG_ARGS; i++) { m->arg_size[i] = 8; + m->arg_flags[i] = 0; + } m->ret_size = 8; m->nr_args = MAX_BPF_FUNC_REG_ARGS; return 0; @@ -5916,7 +5946,7 @@ int btf_distill_func_proto(struct bpf_verifier_log *log, return -EINVAL; } ret = __get_type_size(btf, func->type, &t); - if (ret < 0) { + if (ret < 0 || __btf_type_is_struct(t)) { bpf_log(log, "The function %s return type %s is unsupported.\n", tname, btf_kind_str[BTF_INFO_KIND(t->info)]); @@ -5932,7 +5962,9 @@ int btf_distill_func_proto(struct bpf_verifier_log *log, return -EINVAL; } ret = __get_type_size(btf, args[i].type, &t); - if (ret < 0) { + + /* No support of struct argument size greater than 16 bytes */ + if (ret < 0 || ret > 16) { bpf_log(log, "The function %s arg%d type %s is unsupported.\n", tname, i, btf_kind_str[BTF_INFO_KIND(t->info)]); @@ -5945,6 +5977,7 @@ int btf_distill_func_proto(struct bpf_verifier_log *log, return -EINVAL; } m->arg_size[i] = ret; + m->arg_flags[i] = __btf_type_is_struct(t) ? BTF_FMODEL_STRUCT_ARG : 0; } m->nr_args = nargs; return 0; From patchwork Wed Aug 31 15:26:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yonghong Song X-Patchwork-Id: 12960868 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2D2F0ECAAD4 for ; Wed, 31 Aug 2022 15:27:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231397AbiHaP07 (ORCPT ); Wed, 31 Aug 2022 11:26:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44920 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231331AbiHaP06 (ORCPT ); Wed, 31 Aug 2022 11:26:58 -0400 Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 823BBD7D22 for ; Wed, 31 Aug 2022 08:26:57 -0700 (PDT) Received: from pps.filterd (m0109334.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 27VEh2X0028814 for ; Wed, 31 Aug 2022 08:26:57 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : content-type : content-transfer-encoding : mime-version; s=facebook; bh=emdnKVJ4XcLIuDUVNft48RUwh3aV8FfKVh/bkMSddX4=; b=HcCD85LoocIHJV0nG7jLWaGOD3wnYw7XDzLJwZbPAkRIqK2rj/O8aR6/tZAgkFB+bb+7 0swxqJtyZkI7SG2Jus52PP6flHcMHBOABqGWFtDQpPkAmaXE7lmTB+UfIv4CgaaoNIKZ 8Ao/APeus6NTTsUUGpJh/U24TYNwA8DtrTQ= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3j9qmh65kq-3 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 31 Aug 2022 08:26:57 -0700 Received: from twshared2273.16.frc2.facebook.com (2620:10d:c085:108::8) by mail.thefacebook.com (2620:10d:c085:11d::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Wed, 31 Aug 2022 08:26:55 -0700 Received: by devbig309.ftw3.facebook.com (Postfix, from userid 128203) id 1C62CECDECE6; Wed, 31 Aug 2022 08:26:52 -0700 (PDT) From: Yonghong Song To: CC: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Subject: [PATCH bpf-next v4 2/8] bpf: x86: Support in-register struct arguments in trampoline programs Date: Wed, 31 Aug 2022 08:26:52 -0700 Message-ID: <20220831152652.2078600-1-yhs@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220831152641.2077476-1-yhs@fb.com> References: <20220831152641.2077476-1-yhs@fb.com> X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: Is7ebSvDhUDSiXsXOUaWIM5ekpIiGrjf X-Proofpoint-GUID: Is7ebSvDhUDSiXsXOUaWIM5ekpIiGrjf X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-31_09,2022-08-31_03,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net In C, struct value can be passed as a function argument. For small structs, struct value may be passed in one or more registers. For trampoline based bpf programs, this would cause complication since one-to-one mapping between function argument and arch argument register is not valid any more. The latest llvm16 added bpf support to pass by values for struct up to 16 bytes ([1]). This is also true for x86_64 architecture where two registers will hold the struct value if the struct size is >8 and <= 16. This may not be true if one of struct member is 'double' type but in current linux source code we don't have such instance yet, so we assume all >8 && <= 16 struct holds two general purpose argument registers. Also change on-stack nr_args value to the number of registers holding the arguments. This will permit bpf_get_func_arg() helper to get all argument values. [1] https://reviews.llvm.org/D132144 Signed-off-by: Yonghong Song --- arch/x86/net/bpf_jit_comp.c | 68 +++++++++++++++++++++++++++---------- 1 file changed, 51 insertions(+), 17 deletions(-) diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c index c1f6c1c51d99..ae89f4143eb4 100644 --- a/arch/x86/net/bpf_jit_comp.c +++ b/arch/x86/net/bpf_jit_comp.c @@ -1751,34 +1751,60 @@ st: if (is_imm8(insn->off)) static void save_regs(const struct btf_func_model *m, u8 **prog, int nr_args, int stack_size) { - int i; + int i, j, arg_size, nr_regs; /* Store function arguments to stack. * For a function that accepts two pointers the sequence will be: * mov QWORD PTR [rbp-0x10],rdi * mov QWORD PTR [rbp-0x8],rsi */ - for (i = 0; i < min(nr_args, 6); i++) - emit_stx(prog, bytes_to_bpf_size(m->arg_size[i]), - BPF_REG_FP, - i == 5 ? X86_REG_R9 : BPF_REG_1 + i, - -(stack_size - i * 8)); + for (i = 0, j = 0; i < min(nr_args, 6); i++) { + if (m->arg_flags[i] & BTF_FMODEL_STRUCT_ARG) { + nr_regs = (m->arg_size[i] + 7) / 8; + arg_size = 8; + } else { + nr_regs = 1; + arg_size = m->arg_size[i]; + } + + while (nr_regs) { + emit_stx(prog, bytes_to_bpf_size(arg_size), + BPF_REG_FP, + j == 5 ? X86_REG_R9 : BPF_REG_1 + j, + -(stack_size - j * 8)); + nr_regs--; + j++; + } + } } static void restore_regs(const struct btf_func_model *m, u8 **prog, int nr_args, int stack_size) { - int i; + int i, j, arg_size, nr_regs; /* Restore function arguments from stack. * For a function that accepts two pointers the sequence will be: * EMIT4(0x48, 0x8B, 0x7D, 0xF0); mov rdi,QWORD PTR [rbp-0x10] * EMIT4(0x48, 0x8B, 0x75, 0xF8); mov rsi,QWORD PTR [rbp-0x8] */ - for (i = 0; i < min(nr_args, 6); i++) - emit_ldx(prog, bytes_to_bpf_size(m->arg_size[i]), - i == 5 ? X86_REG_R9 : BPF_REG_1 + i, - BPF_REG_FP, - -(stack_size - i * 8)); + for (i = 0, j = 0; i < min(nr_args, 6); i++) { + if (m->arg_flags[i] & BTF_FMODEL_STRUCT_ARG) { + nr_regs = (m->arg_size[i] + 7) / 8; + arg_size = 8; + } else { + nr_regs = 1; + arg_size = m->arg_size[i]; + } + + while (nr_regs) { + emit_ldx(prog, bytes_to_bpf_size(arg_size), + j == 5 ? X86_REG_R9 : BPF_REG_1 + j, + BPF_REG_FP, + -(stack_size - j * 8)); + nr_regs--; + j++; + } + } } static int invoke_bpf_prog(const struct btf_func_model *m, u8 **pprog, @@ -2015,7 +2041,7 @@ int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *i struct bpf_tramp_links *tlinks, void *orig_call) { - int ret, i, nr_args = m->nr_args; + int ret, i, nr_args = m->nr_args, extra_nregs = 0; int regs_off, ip_off, args_off, stack_size = nr_args * 8, run_ctx_off; struct bpf_tramp_links *fentry = &tlinks[BPF_TRAMP_FENTRY]; struct bpf_tramp_links *fexit = &tlinks[BPF_TRAMP_FEXIT]; @@ -2028,6 +2054,14 @@ int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *i if (nr_args > 6) return -ENOTSUPP; + for (i = 0; i < MAX_BPF_FUNC_ARGS; i++) { + if (m->arg_flags[i] & BTF_FMODEL_STRUCT_ARG) + extra_nregs += (m->arg_size[i] + 7) / 8 - 1; + } + if (nr_args + extra_nregs > 6) + return -ENOTSUPP; + stack_size += extra_nregs * 8; + /* Generated trampoline stack layout: * * RBP + 8 [ return address ] @@ -2040,7 +2074,7 @@ int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *i * [ ... ] * RBP - regs_off [ reg_arg1 ] program's ctx pointer * - * RBP - args_off [ args count ] always + * RBP - args_off [ arg regs count ] always * * RBP - ip_off [ traced function ] BPF_TRAMP_F_IP_ARG flag * @@ -2083,11 +2117,11 @@ int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *i EMIT4(0x48, 0x83, 0xEC, stack_size); /* sub rsp, stack_size */ EMIT1(0x53); /* push rbx */ - /* Store number of arguments of the traced function: - * mov rax, nr_args + /* Store number of argument registers of the traced function: + * mov rax, nr_args + extra_nregs * mov QWORD PTR [rbp - args_off], rax */ - emit_mov_imm64(&prog, BPF_REG_0, 0, (u32) nr_args); + emit_mov_imm64(&prog, BPF_REG_0, 0, (u32) nr_args + extra_nregs); emit_stx(&prog, BPF_DW, BPF_REG_FP, BPF_REG_0, -args_off); if (flags & BPF_TRAMP_F_IP_ARG) { From patchwork Wed Aug 31 15:26:57 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yonghong Song X-Patchwork-Id: 12960869 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0171DECAAD1 for ; Wed, 31 Aug 2022 15:27:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231475AbiHaP1E (ORCPT ); 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Wed, 31 Aug 2022 08:27:02 -0700 Received: from twshared2273.16.frc2.facebook.com (2620:10d:c085:208::11) by mail.thefacebook.com (2620:10d:c085:11d::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Wed, 31 Aug 2022 08:27:01 -0700 Received: by devbig309.ftw3.facebook.com (Postfix, from userid 128203) id 5A525ECDECF2; Wed, 31 Aug 2022 08:26:57 -0700 (PDT) From: Yonghong Song To: CC: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Subject: [PATCH bpf-next v4 3/8] bpf: Update descriptions for helpers bpf_get_func_arg[_cnt]() Date: Wed, 31 Aug 2022 08:26:57 -0700 Message-ID: <20220831152657.2078805-1-yhs@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220831152641.2077476-1-yhs@fb.com> References: <20220831152641.2077476-1-yhs@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: 4GjOD3ifS6oAmVpTLSkiGihv5_gel-bT X-Proofpoint-GUID: 4GjOD3ifS6oAmVpTLSkiGihv5_gel-bT X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-31_09,2022-08-31_03,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Now instead of the number of arguments, the number of registers holding argument values are stored in trampoline. Update the description of bpf_get_func_arg[_cnt]() helpers. Previous programs without struct arguments should continue to work as usual. Signed-off-by: Yonghong Song --- include/uapi/linux/bpf.h | 9 +++++---- tools/include/uapi/linux/bpf.h | 9 +++++---- 2 files changed, 10 insertions(+), 8 deletions(-) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 962960a98835..f9f43343ef93 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -5079,12 +5079,12 @@ union bpf_attr { * * long bpf_get_func_arg(void *ctx, u32 n, u64 *value) * Description - * Get **n**-th argument (zero based) of the traced function (for tracing programs) + * Get **n**-th argument register (zero based) of the traced function (for tracing programs) * returned in **value**. * * Return * 0 on success. - * **-EINVAL** if n >= arguments count of traced function. + * **-EINVAL** if n >= argument register count of traced function. * * long bpf_get_func_ret(void *ctx, u64 *value) * Description @@ -5097,10 +5097,11 @@ union bpf_attr { * * long bpf_get_func_arg_cnt(void *ctx) * Description - * Get number of arguments of the traced function (for tracing programs). + * Get number of registers of the traced function (for tracing programs) where + * function arguments are stored in these registers. * * Return - * The number of arguments of the traced function. + * The number of argument registers of the traced function. * * int bpf_get_retval(void) * Description diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index f4ba82a1eace..f13fa71822f4 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -5079,12 +5079,12 @@ union bpf_attr { * * long bpf_get_func_arg(void *ctx, u32 n, u64 *value) * Description - * Get **n**-th argument (zero based) of the traced function (for tracing programs) + * Get **n**-th argument register (zero based) of the traced function (for tracing programs) * returned in **value**. * * Return * 0 on success. - * **-EINVAL** if n >= arguments count of traced function. + * **-EINVAL** if n >= argument register count of traced function. * * long bpf_get_func_ret(void *ctx, u64 *value) * Description @@ -5097,10 +5097,11 @@ union bpf_attr { * * long bpf_get_func_arg_cnt(void *ctx) * Description - * Get number of arguments of the traced function (for tracing programs). + * Get number of registers of the traced function (for tracing programs) where + * function arguments are stored in these registers. * * Return - * The number of arguments of the traced function. + * The number of argument registers of the traced function. * * int bpf_get_retval(void) * Description From patchwork Wed Aug 31 15:27:02 2022 Content-Type: text/plain; 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Wed, 31 Aug 2022 08:27:02 -0700 (PDT) From: Yonghong Song To: CC: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Subject: [PATCH bpf-next v4 4/8] bpf: arm64: No support of struct argument in trampoline programs Date: Wed, 31 Aug 2022 08:27:02 -0700 Message-ID: <20220831152702.2079066-1-yhs@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220831152641.2077476-1-yhs@fb.com> References: <20220831152641.2077476-1-yhs@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: RXhVivtKdgvXB-F3jj2nBRG3swGiBbuT X-Proofpoint-GUID: RXhVivtKdgvXB-F3jj2nBRG3swGiBbuT X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-31_09,2022-08-31_03,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net ARM64 does not support struct argument for trampoline based bpf programs yet. Signed-off-by: Yonghong Song --- arch/arm64/net/bpf_jit_comp.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c index 389623ae5a91..30f76178608b 100644 --- a/arch/arm64/net/bpf_jit_comp.c +++ b/arch/arm64/net/bpf_jit_comp.c @@ -1970,7 +1970,7 @@ int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, u32 flags, struct bpf_tramp_links *tlinks, void *orig_call) { - int ret; + int i, ret; int nargs = m->nr_args; int max_insns = ((long)image_end - (long)image) / AARCH64_INSN_SIZE; struct jit_ctx ctx = { @@ -1982,6 +1982,12 @@ int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, if (nargs > 8) return -ENOTSUPP; + /* don't support struct argument */ + for (i = 0; i < MAX_BPF_FUNC_ARGS; i++) { + if (m->arg_flags[i] & BTF_FMODEL_STRUCT_ARG) + return -ENOTSUPP; + } + ret = prepare_trampoline(&ctx, im, tlinks, orig_call, nargs, flags); if (ret < 0) return ret; From patchwork Wed Aug 31 15:27:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yonghong Song X-Patchwork-Id: 12960871 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6E9F2ECAAD1 for ; Wed, 31 Aug 2022 15:27:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231626AbiHaP1W (ORCPT ); Wed, 31 Aug 2022 11:27:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45170 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231682AbiHaP1N (ORCPT ); Wed, 31 Aug 2022 11:27:13 -0400 Received: from mx0b-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4798DD7D3D for ; Wed, 31 Aug 2022 08:27:12 -0700 (PDT) Received: from pps.filterd (m0109331.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 27VEh3YZ005204 for ; Wed, 31 Aug 2022 08:27:11 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=aSPJH4PfRfZIUVIya1Yu+6J8yQ3dyT0KsPY5SACrh8o=; b=ogGmarR2zfREDpa8HYWlj118BkVxz6OKnHrkS0aSOqCw+P2zUSbAV0AtdzxV6P6jIXa2 1QQJ+2VoeD8YpUuevGWbq7ILOmeDI5nRaO9B5Pup0fGNZTvYG2Urqb7VcQJDgIBod2oS 4r2hXtwZgmmWB4YsmTiqONDDqYBM1kagYtc= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3ja8n38t42-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 31 Aug 2022 08:27:11 -0700 Received: from twshared3888.09.ash9.facebook.com (2620:10d:c085:108::4) by mail.thefacebook.com (2620:10d:c085:11d::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Wed, 31 Aug 2022 08:27:09 -0700 Received: by devbig309.ftw3.facebook.com (Postfix, from userid 128203) id D468BECDED0D; Wed, 31 Aug 2022 08:27:07 -0700 (PDT) From: Yonghong Song To: CC: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Subject: [PATCH bpf-next v4 5/8] libbpf: Add new BPF_PROG2 macro Date: Wed, 31 Aug 2022 08:27:07 -0700 Message-ID: <20220831152707.2079473-1-yhs@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220831152641.2077476-1-yhs@fb.com> References: <20220831152641.2077476-1-yhs@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-GUID: XVkpjTOkX5XgTDAXDWlF-X5RRlRZssZw X-Proofpoint-ORIG-GUID: XVkpjTOkX5XgTDAXDWlF-X5RRlRZssZw X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-31_09,2022-08-31_03,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net To support struct arguments in trampoline based programs, existing BPF_PROG doesn't work any more since the type size is needed to find whether a parameter takes one or two registers. So this patch added a new BPF_PROG2 macro to support such trampoline programs. The idea is suggested by Andrii. For example, if the to-be-traced function has signature like typedef struct { void *x; int t; } sockptr; int blah(sockptr x, char y); In the new BPF_PROG2 macro, the argument can be represented as __bpf_prog_call( ({ union { struct { __u64 x, y; } ___z; sockptr x; } ___tmp = { .___z = { ctx[0], ctx[1] }}; ___tmp.x; }), ({ union { struct { __u8 x; } ___z; char y; } ___tmp = { .___z = { ctx[2] }}; ___tmp.y; })); In the above, the values stored on the stack are properly assigned to the actual argument type value by using 'union' magic. Note that the macro also works even if no arguments are with struct types. Note that new BPF_PROG2 works for both llvm16 and pre-llvm16 compilers where llvm16 supports bpf target passing value with struct up to 16 byte size and pre-llvm16 will pass by reference by storing values on the stack. With static functions with struct argument as always inline, the compiler is able to optimize and remove additional stack saving of struct values. Signed-off-by: Yonghong Song --- tools/lib/bpf/bpf_tracing.h | 79 +++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h index 5fdb93da423b..8d4bdd18cb3d 100644 --- a/tools/lib/bpf/bpf_tracing.h +++ b/tools/lib/bpf/bpf_tracing.h @@ -438,6 +438,85 @@ typeof(name(0)) name(unsigned long long *ctx) \ static __always_inline typeof(name(0)) \ ____##name(unsigned long long *ctx, ##args) +#ifndef ____bpf_nth +#define ____bpf_nth(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, N, ...) N +#endif +#ifndef ____bpf_narg +#define ____bpf_narg(...) ____bpf_nth(_, ##__VA_ARGS__, 12, 12, 11, 11, 10, 10, 9, 9, 8, 8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0) +#endif + +#define BPF_REG_CNT(t) \ + (__builtin_choose_expr(sizeof(t) == 1 || sizeof(t) == 2 || sizeof(t) == 4 || sizeof(t) == 8, 1, \ + __builtin_choose_expr(sizeof(t) == 16, 2, \ + (void)0))) + +#define ____bpf_reg_cnt0() (0) +#define ____bpf_reg_cnt1(t, x) (____bpf_reg_cnt0() + BPF_REG_CNT(t)) +#define ____bpf_reg_cnt2(t, x, args...) (____bpf_reg_cnt1(args) + BPF_REG_CNT(t)) +#define ____bpf_reg_cnt3(t, x, args...) (____bpf_reg_cnt2(args) + BPF_REG_CNT(t)) +#define ____bpf_reg_cnt4(t, x, args...) (____bpf_reg_cnt3(args) + BPF_REG_CNT(t)) +#define ____bpf_reg_cnt5(t, x, args...) (____bpf_reg_cnt4(args) + BPF_REG_CNT(t)) +#define ____bpf_reg_cnt6(t, x, args...) (____bpf_reg_cnt5(args) + BPF_REG_CNT(t)) +#define ____bpf_reg_cnt7(t, x, args...) (____bpf_reg_cnt6(args) + BPF_REG_CNT(t)) +#define ____bpf_reg_cnt8(t, x, args...) (____bpf_reg_cnt7(args) + BPF_REG_CNT(t)) +#define ____bpf_reg_cnt9(t, x, args...) (____bpf_reg_cnt8(args) + BPF_REG_CNT(t)) +#define ____bpf_reg_cnt10(t, x, args...) (____bpf_reg_cnt9(args) + BPF_REG_CNT(t)) +#define ____bpf_reg_cnt11(t, x, args...) (____bpf_reg_cnt10(args) + BPF_REG_CNT(t)) +#define ____bpf_reg_cnt12(t, x, args...) (____bpf_reg_cnt11(args) + BPF_REG_CNT(t)) +#define ____bpf_reg_cnt(args...) ___bpf_apply(____bpf_reg_cnt, ____bpf_narg(args))(args) + +#define ____bpf_union_arg(t, x, n) \ + __builtin_choose_expr(sizeof(t) == 1, ({ union { struct { __u8 x; } ___z; t x; } ___tmp = { .___z = {ctx[n]}}; ___tmp.x; }), \ + __builtin_choose_expr(sizeof(t) == 2, ({ union { struct { __u16 x; } ___z; t x; } ___tmp = { .___z = {ctx[n]} }; ___tmp.x; }), \ + __builtin_choose_expr(sizeof(t) == 4, ({ union { struct { __u32 x; } ___z; t x; } ___tmp = { .___z = {ctx[n]} }; ___tmp.x; }), \ + __builtin_choose_expr(sizeof(t) == 8, ({ union { struct { __u64 x; } ___z; t x; } ___tmp = {.___z = {ctx[n]} }; ___tmp.x; }), \ + __builtin_choose_expr(sizeof(t) == 16, ({ union { struct { __u64 x, y; } ___z; t x; } ___tmp = {.___z = {ctx[n], ctx[n + 1]} }; ___tmp.x; }), \ + (void)0))))) + +#define ____bpf_ctx_arg0(n, args...) +#define ____bpf_ctx_arg1(n, t, x) , ____bpf_union_arg(t, x, n - ____bpf_reg_cnt1(t, x)) +#define ____bpf_ctx_arg2(n, t, x, args...) , ____bpf_union_arg(t, x, n - ____bpf_reg_cnt2(t, x, args)) ____bpf_ctx_arg1(n, args) +#define ____bpf_ctx_arg3(n, t, x, args...) , ____bpf_union_arg(t, x, n - ____bpf_reg_cnt3(t, x, args)) ____bpf_ctx_arg2(n, args) +#define ____bpf_ctx_arg4(n, t, x, args...) , ____bpf_union_arg(t, x, n - ____bpf_reg_cnt4(t, x, args)) ____bpf_ctx_arg3(n, args) +#define ____bpf_ctx_arg5(n, t, x, args...) , ____bpf_union_arg(t, x, n - ____bpf_reg_cnt5(t, x, args)) ____bpf_ctx_arg4(n, args) +#define ____bpf_ctx_arg6(n, t, x, args...) , ____bpf_union_arg(t, x, n - ____bpf_reg_cnt6(t, x, args)) ____bpf_ctx_arg5(n, args) +#define ____bpf_ctx_arg7(n, t, x, args...) , ____bpf_union_arg(t, x, n - ____bpf_reg_cnt7(t, x, args)) ____bpf_ctx_arg6(n, args) +#define ____bpf_ctx_arg8(n, t, x, args...) , ____bpf_union_arg(t, x, n - ____bpf_reg_cnt8(t, x, args)) ____bpf_ctx_arg7(n, args) +#define ____bpf_ctx_arg9(n, t, x, args...) , ____bpf_union_arg(t, x, n - ____bpf_reg_cnt9(t, x, args)) ____bpf_ctx_arg8(n, args) +#define ____bpf_ctx_arg10(n, t, x, args...) , ____bpf_union_arg(t, x, n - ____bpf_reg_cnt10(t, x, args)) ____bpf_ctx_arg9(n, args) +#define ____bpf_ctx_arg11(n, t, x, args...) , ____bpf_union_arg(t, x, n - ____bpf_reg_cnt11(t, x, args)) ____bpf_ctx_arg10(n, args) +#define ____bpf_ctx_arg12(n, t, x, args...) , ____bpf_union_arg(t, x, n - ____bpf_reg_cnt12(t, x, args)) ____bpf_ctx_arg11(n, args) +#define ____bpf_ctx_arg(n, args...) ___bpf_apply(____bpf_ctx_arg, ____bpf_narg(args))(n, args) + +#define ____bpf_ctx_decl0() +#define ____bpf_ctx_decl1(t, x) , t x +#define ____bpf_ctx_decl2(t, x, args...) , t x ____bpf_ctx_decl1(args) +#define ____bpf_ctx_decl3(t, x, args...) , t x ____bpf_ctx_decl2(args) +#define ____bpf_ctx_decl4(t, x, args...) , t x ____bpf_ctx_decl3(args) +#define ____bpf_ctx_decl5(t, x, args...) , t x ____bpf_ctx_decl4(args) +#define ____bpf_ctx_decl6(t, x, args...) , t x ____bpf_ctx_decl5(args) +#define ____bpf_ctx_decl7(t, x, args...) , t x ____bpf_ctx_decl6(args) +#define ____bpf_ctx_decl8(t, x, args...) , t x ____bpf_ctx_decl7(args) +#define ____bpf_ctx_decl9(t, x, args...) , t x ____bpf_ctx_decl8(args) +#define ____bpf_ctx_decl10(t, x, args...) , t x ____bpf_ctx_decl9(args) +#define ____bpf_ctx_decl11(t, x, args...) , t x ____bpf_ctx_decl10(args) +#define ____bpf_ctx_decl12(t, x, args...) , t x ____bpf_ctx_decl11(args) +#define ____bpf_ctx_decl(args...) ___bpf_apply(____bpf_ctx_decl, ____bpf_narg(args))(args) + +/* + * BPF_PROG2 can handle struct arguments. + */ +#define BPF_PROG2(name, args...) \ +name(unsigned long long *ctx); \ +static __always_inline typeof(name(0)) \ +____##name(unsigned long long *ctx ____bpf_ctx_decl(args)); \ +typeof(name(0)) name(unsigned long long *ctx) \ +{ \ + return ____##name(ctx ____bpf_ctx_arg(____bpf_reg_cnt(args), args)); \ +} \ +static __always_inline typeof(name(0)) \ +____##name(unsigned long long *ctx ____bpf_ctx_decl(args)) + struct pt_regs; #define ___bpf_kprobe_args0() ctx From patchwork Wed Aug 31 15:27:13 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yonghong Song X-Patchwork-Id: 12960873 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B33F3C0502A for ; Wed, 31 Aug 2022 15:27:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231658AbiHaP1d (ORCPT ); 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Date: Wed, 31 Aug 2022 08:27:13 -0700 Message-ID: <20220831152713.2080039-1-yhs@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220831152641.2077476-1-yhs@fb.com> References: <20220831152641.2077476-1-yhs@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: J-UqeEdyLbdOdJcQwLsD_1jqbVPON-6r X-Proofpoint-GUID: J-UqeEdyLbdOdJcQwLsD_1jqbVPON-6r X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-31_09,2022-08-31_03,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Add various struct argument tests with fentry/fexit programs. Also add one test with a kernel func which does not have any argument to test BPF_PROG2 macro in such situation. Signed-off-by: Yonghong Song --- .../selftests/bpf/bpf_testmod/bpf_testmod.c | 48 +++++++ .../selftests/bpf/prog_tests/tracing_struct.c | 63 +++++++++ .../selftests/bpf/progs/tracing_struct.c | 120 ++++++++++++++++++ 3 files changed, 231 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/tracing_struct.c create mode 100644 tools/testing/selftests/bpf/progs/tracing_struct.c diff --git a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c index 792cb15bac40..a6021d6117b5 100644 --- a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c +++ b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c @@ -18,6 +18,46 @@ typedef int (*func_proto_typedef_nested1)(func_proto_typedef); typedef int (*func_proto_typedef_nested2)(func_proto_typedef_nested1); DEFINE_PER_CPU(int, bpf_testmod_ksym_percpu) = 123; +long bpf_testmod_test_struct_arg_result; + +struct bpf_testmod_struct_arg_1 { + int a; +}; +struct bpf_testmod_struct_arg_2 { + long a; + long b; +}; + +noinline int +bpf_testmod_test_struct_arg_1(struct bpf_testmod_struct_arg_2 a, int b, int c) { + bpf_testmod_test_struct_arg_result = a.a + a.b + b + c; + return bpf_testmod_test_struct_arg_result; +} + +noinline int +bpf_testmod_test_struct_arg_2(int a, struct bpf_testmod_struct_arg_2 b, int c) { + bpf_testmod_test_struct_arg_result = a + b.a + b.b + c; + return bpf_testmod_test_struct_arg_result; +} + +noinline int +bpf_testmod_test_struct_arg_3(int a, int b, struct bpf_testmod_struct_arg_2 c) { + bpf_testmod_test_struct_arg_result = a + b + c.a + c.b; + return bpf_testmod_test_struct_arg_result; +} + +noinline int +bpf_testmod_test_struct_arg_4(struct bpf_testmod_struct_arg_1 a, int b, + int c, int d, struct bpf_testmod_struct_arg_2 e) { + bpf_testmod_test_struct_arg_result = a.a + b + c + d + e.a + e.b; + return bpf_testmod_test_struct_arg_result; +} + +noinline int +bpf_testmod_test_struct_arg_5(void) { + bpf_testmod_test_struct_arg_result = 1; + return bpf_testmod_test_struct_arg_result; +} noinline void bpf_testmod_test_mod_kfunc(int i) @@ -98,11 +138,19 @@ bpf_testmod_test_read(struct file *file, struct kobject *kobj, .off = off, .len = len, }; + struct bpf_testmod_struct_arg_1 struct_arg1 = {10}; + struct bpf_testmod_struct_arg_2 struct_arg2 = {2, 3}; int i = 1; while (bpf_testmod_return_ptr(i)) i++; + (void)bpf_testmod_test_struct_arg_1(struct_arg2, 1, 4); + (void)bpf_testmod_test_struct_arg_2(1, struct_arg2, 4); + (void)bpf_testmod_test_struct_arg_3(1, 4, struct_arg2); + (void)bpf_testmod_test_struct_arg_4(struct_arg1, 1, 2, 3, struct_arg2); + (void)bpf_testmod_test_struct_arg_5(); + /* This is always true. Use the check to make sure the compiler * doesn't remove bpf_testmod_loop_test. */ diff --git a/tools/testing/selftests/bpf/prog_tests/tracing_struct.c b/tools/testing/selftests/bpf/prog_tests/tracing_struct.c new file mode 100644 index 000000000000..d5022b91d1e4 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/tracing_struct.c @@ -0,0 +1,63 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */ + +#include +#include "tracing_struct.skel.h" + +static void test_fentry(void) +{ + struct tracing_struct *skel; + int err; + + skel = tracing_struct__open_and_load(); + if (!ASSERT_OK_PTR(skel, "tracing_struct__open_and_load")) + return; + + err = tracing_struct__attach(skel); + if (!ASSERT_OK(err, "tracing_struct__attach")) + return; + + ASSERT_OK(trigger_module_test_read(256), "trigger_read"); + + ASSERT_EQ(skel->bss->t1_a_a, 2, "t1:a.a"); + ASSERT_EQ(skel->bss->t1_a_b, 3, "t1:a.b"); + ASSERT_EQ(skel->bss->t1_b, 1, "t1:b"); + ASSERT_EQ(skel->bss->t1_c, 4, "t1:c"); + + ASSERT_EQ(skel->bss->t1_nregs, 4, "t1 nregs"); + ASSERT_EQ(skel->bss->t1_reg0, 2, "t1 reg0"); + ASSERT_EQ(skel->bss->t1_reg1, 3, "t1 reg1"); + ASSERT_EQ(skel->bss->t1_reg2, 1, "t1 reg2"); + ASSERT_EQ(skel->bss->t1_reg3, 4, "t1 reg3"); + ASSERT_EQ(skel->bss->t1_ret, 10, "t1 ret"); + + ASSERT_EQ(skel->bss->t2_a, 1, "t2:a"); + ASSERT_EQ(skel->bss->t2_b_a, 2, "t2:b.a"); + ASSERT_EQ(skel->bss->t2_b_b, 3, "t2:b.b"); + ASSERT_EQ(skel->bss->t2_c, 4, "t2:c"); + ASSERT_EQ(skel->bss->t2_ret, 10, "t2 ret"); + + ASSERT_EQ(skel->bss->t3_a, 1, "t3:a"); + ASSERT_EQ(skel->bss->t3_b, 4, "t3:b"); + ASSERT_EQ(skel->bss->t3_c_a, 2, "t3:c.a"); + ASSERT_EQ(skel->bss->t3_c_b, 3, "t3:c.b"); + ASSERT_EQ(skel->bss->t3_ret, 10, "t3 ret"); + + ASSERT_EQ(skel->bss->t4_a_a, 10, "t4:a.a"); + ASSERT_EQ(skel->bss->t4_b, 1, "t4:b"); + ASSERT_EQ(skel->bss->t4_c, 2, "t4:c"); + ASSERT_EQ(skel->bss->t4_d, 3, "t4:d"); + ASSERT_EQ(skel->bss->t4_e_a, 2, "t4:e.a"); + ASSERT_EQ(skel->bss->t4_e_b, 3, "t4:e.b"); + ASSERT_EQ(skel->bss->t4_ret, 21, "t4 ret"); + + ASSERT_EQ(skel->bss->t5_ret, 1, "t5 ret"); + + tracing_struct__detach(skel); + tracing_struct__destroy(skel); +} + +void test_tracing_struct(void) +{ + test_fentry(); +} diff --git a/tools/testing/selftests/bpf/progs/tracing_struct.c b/tools/testing/selftests/bpf/progs/tracing_struct.c new file mode 100644 index 000000000000..e718f0ebee7d --- /dev/null +++ b/tools/testing/selftests/bpf/progs/tracing_struct.c @@ -0,0 +1,120 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */ + +#include +#include +#include + +struct bpf_testmod_struct_arg_1 { + int a; +}; +struct bpf_testmod_struct_arg_2 { + long a; + long b; +}; + +long t1_a_a, t1_a_b, t1_b, t1_c, t1_ret, t1_nregs; +__u64 t1_reg0, t1_reg1, t1_reg2, t1_reg3; +long t2_a, t2_b_a, t2_b_b, t2_c, t2_ret; +long t3_a, t3_b, t3_c_a, t3_c_b, t3_ret; +long t4_a_a, t4_b, t4_c, t4_d, t4_e_a, t4_e_b, t4_ret; +long t5_ret; + +SEC("fentry/bpf_testmod_test_struct_arg_1") +int BPF_PROG2(test_struct_arg_1, struct bpf_testmod_struct_arg_2, a, int, b, int, c) +{ + t1_a_a = a.a; + t1_a_b = a.b; + t1_b = b; + t1_c = c; + return 0; +} + +SEC("fexit/bpf_testmod_test_struct_arg_1") +int BPF_PROG2(test_struct_arg_2, struct bpf_testmod_struct_arg_2, a, int, b, int, c, int, ret) +{ + t1_nregs = bpf_get_func_arg_cnt(ctx); + /* a.a */ + bpf_get_func_arg(ctx, 0, &t1_reg0); + /* a.b */ + bpf_get_func_arg(ctx, 1, &t1_reg1); + /* b */ + bpf_get_func_arg(ctx, 2, &t1_reg2); + t1_reg2 = (int)t1_reg2; + /* c */ + bpf_get_func_arg(ctx, 3, &t1_reg3); + t1_reg3 = (int)t1_reg3; + + t1_ret = ret; + return 0; +} + +SEC("fentry/bpf_testmod_test_struct_arg_2") +int BPF_PROG2(test_struct_arg_3, int, a, struct bpf_testmod_struct_arg_2, b, int, c) +{ + t2_a = a; + t2_b_a = b.a; + t2_b_b = b.b; + t2_c = c; + return 0; +} + +SEC("fexit/bpf_testmod_test_struct_arg_2") +int BPF_PROG2(test_struct_arg_4, int, a, struct bpf_testmod_struct_arg_2, b, int, c, int, ret) +{ + t2_ret = ret; + return 0; +} + +SEC("fentry/bpf_testmod_test_struct_arg_3") +int BPF_PROG2(test_struct_arg_5, int, a, int, b, struct bpf_testmod_struct_arg_2, c) +{ + t3_a = a; + t3_b = b; + t3_c_a = c.a; + t3_c_b = c.b; + return 0; +} + +SEC("fexit/bpf_testmod_test_struct_arg_3") +int BPF_PROG2(test_struct_arg_6, int, a, int, b, struct bpf_testmod_struct_arg_2, c, int, ret) +{ + t3_ret = ret; + return 0; +} + +SEC("fentry/bpf_testmod_test_struct_arg_4") +int BPF_PROG2(test_struct_arg_7, struct bpf_testmod_struct_arg_1, a, int, b, + int, c, int, d, struct bpf_testmod_struct_arg_2, e) +{ + t4_a_a = a.a; + t4_b = b; + t4_c = c; + t4_d = d; + t4_e_a = e.a; + t4_e_b = e.b; + return 0; +} + +SEC("fexit/bpf_testmod_test_struct_arg_4") +int BPF_PROG2(test_struct_arg_8, struct bpf_testmod_struct_arg_1, a, int, b, + int, c, int, d, struct bpf_testmod_struct_arg_2, e, int, ret) +{ + t4_ret = ret; + return 0; +} + +SEC("fentry/bpf_testmod_test_struct_arg_5") +int BPF_PROG2(test_struct_arg_9) +{ + return 0; +} + +SEC("fexit/bpf_testmod_test_struct_arg_5") +int BPF_PROG2(test_struct_arg_10, int, ret) +{ + t5_ret = ret; + return 0; +} + +char _license[] SEC("license") = "GPL"; 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Wed, 31 Aug 2022 08:27:21 -0700 Received: by devbig309.ftw3.facebook.com (Postfix, from userid 128203) id 60C16ECDED51; Wed, 31 Aug 2022 08:27:18 -0700 (PDT) From: Yonghong Song To: CC: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Subject: [PATCH bpf-next v4 7/8] selftests/bpf: Use BPF_PROG2 for some fentry programs without struct arguments Date: Wed, 31 Aug 2022 08:27:18 -0700 Message-ID: <20220831152718.2081091-1-yhs@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220831152641.2077476-1-yhs@fb.com> References: <20220831152641.2077476-1-yhs@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: 61uEKRYwJeWyGodwDGJW6Ewl-JJl43VG X-Proofpoint-GUID: 61uEKRYwJeWyGodwDGJW6Ewl-JJl43VG X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-31_09,2022-08-31_03,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Use BPF_PROG2 instead of BPF_PROG for programs in progs/timer.c to test BPF_PROG2 for cases without struct arguments. Signed-off-by: Yonghong Song --- tools/testing/selftests/bpf/progs/timer.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/bpf/progs/timer.c b/tools/testing/selftests/bpf/progs/timer.c index 5f5309791649..560a63e95dc3 100644 --- a/tools/testing/selftests/bpf/progs/timer.c +++ b/tools/testing/selftests/bpf/progs/timer.c @@ -120,7 +120,7 @@ static int timer_cb1(void *map, int *key, struct bpf_timer *timer) } SEC("fentry/bpf_fentry_test1") -int BPF_PROG(test1, int a) +int BPF_PROG2(test1, int, a) { struct bpf_timer *arr_timer, *lru_timer; struct elem init = {}; @@ -247,7 +247,7 @@ int bpf_timer_test(void) } SEC("fentry/bpf_fentry_test2") -int BPF_PROG(test2, int a, int b) +int BPF_PROG2(test2, int, a, int, b) { struct hmap_elem init = {}, *val; int key = HTAB, key_malloc = HTAB_MALLOC; From patchwork Wed Aug 31 15:27:23 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yonghong Song X-Patchwork-Id: 12960874 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 966A7ECAAD4 for ; Wed, 31 Aug 2022 15:27:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231589AbiHaP1k (ORCPT ); Wed, 31 Aug 2022 11:27:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45726 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231707AbiHaP1i (ORCPT ); Wed, 31 Aug 2022 11:27:38 -0400 Received: from mx0a-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 41F13D7D3D for ; Wed, 31 Aug 2022 08:27:34 -0700 (PDT) Received: from pps.filterd (m0001303.ppops.net [127.0.0.1]) by m0001303.ppops.net (8.17.1.5/8.17.1.5) with ESMTP id 27VEgxmX002355 for ; Wed, 31 Aug 2022 08:27:34 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=qDok8Iq5w17SAnHEfnuZ66U119jMnfMCQ5dCfMHVvxU=; b=cqYd4Ns0rDq3MvI6ymxknsCU4Q6kEPm1oVIhQkEUxe8VPbyxUbNbPDHWOYUimZPAVO1k aJv7c+3fX4Djcbs6VkKEYsp9uzT8v+nZ6JyoxPmFZ+UhI04QhEsy5gg0aKycjP6IRl8p EEcZU8rk9BCDCaCpByYpsWUf0BpP+M6s70E= Received: from maileast.thefacebook.com ([163.114.130.16]) by m0001303.ppops.net (PPS) with ESMTPS id 3j9nkryfad-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 31 Aug 2022 08:27:34 -0700 Received: from twshared10425.14.frc2.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:82::e) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Wed, 31 Aug 2022 08:27:33 -0700 Received: by devbig309.ftw3.facebook.com (Postfix, from userid 128203) id A66D5ECDED70; Wed, 31 Aug 2022 08:27:23 -0700 (PDT) From: Yonghong Song To: CC: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Subject: [PATCH bpf-next v4 8/8] selftests/bpf: Add tracing_struct test in DENYLIST.s390x Date: Wed, 31 Aug 2022 08:27:23 -0700 Message-ID: <20220831152723.2081551-1-yhs@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220831152641.2077476-1-yhs@fb.com> References: <20220831152641.2077476-1-yhs@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-GUID: yiHvCCHu_6r92-Xzk4S9at_JLnGXWPQW X-Proofpoint-ORIG-GUID: yiHvCCHu_6r92-Xzk4S9at_JLnGXWPQW X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-31_09,2022-08-31_03,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Add tracing_struct test in DENYLIST.s390x since s390x does not support trampoline now. Signed-off-by: Yonghong Song --- tools/testing/selftests/bpf/DENYLIST.s390x | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/testing/selftests/bpf/DENYLIST.s390x b/tools/testing/selftests/bpf/DENYLIST.s390x index 736b65f61022..aa18b6d24510 100644 --- a/tools/testing/selftests/bpf/DENYLIST.s390x +++ b/tools/testing/selftests/bpf/DENYLIST.s390x @@ -68,3 +68,4 @@ unpriv_bpf_disabled # fentry setget_sockopt # attach unexpected error: -524 (trampoline) cb_refs # expected error message unexpected error: -524 (trampoline) cgroup_hierarchical_stats # JIT does not support calling kernel function (kfunc) +tracing_struct # failed to auto-attach: -524 (trampoline)