From patchwork Sun Aug 2 22:29:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexei Starovoitov X-Patchwork-Id: 262815 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E9F6AC433E1 for ; Sun, 2 Aug 2020 22:30:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BBF85206F6 for ; Sun, 2 Aug 2020 22:30:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="dh4cPGXz" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727906AbgHBW37 (ORCPT ); Sun, 2 Aug 2020 18:29:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54932 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727783AbgHBW35 (ORCPT ); Sun, 2 Aug 2020 18:29:57 -0400 Received: from mail-pg1-x541.google.com (mail-pg1-x541.google.com [IPv6:2607:f8b0:4864:20::541]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3DFE4C06174A; Sun, 2 Aug 2020 15:29:57 -0700 (PDT) Received: by mail-pg1-x541.google.com with SMTP id z5so18866405pgb.6; Sun, 02 Aug 2020 15:29:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=JLtbo5erIXW9fZ8Wma47Tf0AHp1bi1VfpKCia0Xa9ww=; b=dh4cPGXzG1sWYSRyTpNW2wSknUkyAESWq/Zd7kVI2n8E3l6V4+2EFlFDP9BdN7pmHC 5bIL0dTWIDSh4ZjHJP02Az8GKQdSqmReIij2BN4dw77pqkf7t92vN/rNSKPG9CDwh0qh oVQfkk6IZUUALPVORwd/9BkJ0KnlsTZmQhpNcwmVWynVvwp0z76sL0ygJeg6+pAt0KFJ IIy4F9H6UAF0mk7zYLNkWE1VFFUPEdP4tkUaaV5UN5v+wiDxAXjcQEfYWyNd1gjWGEbo WdUIoESmZ8Qh4mulugJwA37VGHMVWOCjIn1LB3qFjBhX/QPPl+gerkOKcQI+0c2zzCfT Z2JQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=JLtbo5erIXW9fZ8Wma47Tf0AHp1bi1VfpKCia0Xa9ww=; b=XKqf9DK7N57AfpPl+KzUsHCeS41w/KbvqOKO9wMhskEyguybblh4O/bIoVPTsJp+R7 gj2X1WnGCs5aQbsyc6oFfpz/SF1ku/99FnQ6RY1Ha79JXXj2perUr31dCKxlI0MdyLuM uxdB7kRAPIggkHC+rfoxZJVc72xwCSEkWJHy9/vis5p22xaB3O9xX1shH3yh0mkn1cub sBp75ZXL+r5cnrfCj3293DytA5Foixpv31z2p15Zew/ZbyOrqbrMff1MsSp927yamFus G1CuRwwokqE/a25PPfsQqJxFJ8uWzeVerU7TR1ICbRIyeQOYjlikNVySTNIdLEcfbFyA 1uSA== X-Gm-Message-State: AOAM532AdSrIPdv344bmCyhlzJJdipauZTb8FXbAQFBR2VL1WKw8dsAe O+E4ztNfp9PRQoRy/Sk+Lb01RSZE X-Google-Smtp-Source: ABdhPJwEtjYXqAuuaXnPSuFyTUjJWyquG+RUwDjrL4iLgriA+hThsaVpdKMazYHNVPh22LMZcLO92Q== X-Received: by 2002:aa7:8005:: with SMTP id j5mr12509306pfi.142.1596407396269; Sun, 02 Aug 2020 15:29:56 -0700 (PDT) Received: from ast-mbp.thefacebook.com ([163.114.132.7]) by smtp.gmail.com with ESMTPSA id g5sm15544414pjl.31.2020.08.02.15.29.54 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 02 Aug 2020 15:29:55 -0700 (PDT) From: Alexei Starovoitov To: davem@davemloft.net Cc: daniel@iogearbox.net, netdev@vger.kernel.org, bpf@vger.kernel.org, kernel-team@fb.com Subject: [PATCH v5 bpf-next 2/4] bpf: Add BPF program and map iterators as built-in BPF programs. Date: Sun, 2 Aug 2020 15:29:48 -0700 Message-Id: <20200802222950.34696-3-alexei.starovoitov@gmail.com> X-Mailer: git-send-email 2.13.5 In-Reply-To: <20200802222950.34696-1-alexei.starovoitov@gmail.com> References: <20200802222950.34696-1-alexei.starovoitov@gmail.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Alexei Starovoitov The program and map iterators work similar to seq_file-s. Once the program is pinned in bpffs it can be read with "cat" tool to print human readable output. In this case about BPF programs and maps. For example: $ cat /sys/fs/bpf/progs.debug id name attached 5 dump_bpf_map bpf_iter_bpf_map 6 dump_bpf_prog bpf_iter_bpf_prog $ cat /sys/fs/bpf/maps.debug id name max_entries 3 iterator.rodata 1 To avoid kernel build dependency on clang 10 separate bpf skeleton generation into manual "make" step and instead check-in generated .skel.h into git. Unlike 'bpftool prog show' in-kernel BTF name is used (when available) to print full name of BPF program instead of 16-byte truncated name. Signed-off-by: Alexei Starovoitov Acked-by: Andrii Nakryiko --- kernel/bpf/preload/iterators/.gitignore | 2 + kernel/bpf/preload/iterators/Makefile | 57 +++ kernel/bpf/preload/iterators/README | 4 + kernel/bpf/preload/iterators/iterators.bpf.c | 114 +++++ kernel/bpf/preload/iterators/iterators.skel.h | 410 ++++++++++++++++++ 5 files changed, 587 insertions(+) create mode 100644 kernel/bpf/preload/iterators/.gitignore create mode 100644 kernel/bpf/preload/iterators/Makefile create mode 100644 kernel/bpf/preload/iterators/README create mode 100644 kernel/bpf/preload/iterators/iterators.bpf.c create mode 100644 kernel/bpf/preload/iterators/iterators.skel.h diff --git a/kernel/bpf/preload/iterators/.gitignore b/kernel/bpf/preload/iterators/.gitignore new file mode 100644 index 000000000000..ffdb70230c8b --- /dev/null +++ b/kernel/bpf/preload/iterators/.gitignore @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +/.output diff --git a/kernel/bpf/preload/iterators/Makefile b/kernel/bpf/preload/iterators/Makefile new file mode 100644 index 000000000000..28fa8c1440f4 --- /dev/null +++ b/kernel/bpf/preload/iterators/Makefile @@ -0,0 +1,57 @@ +# SPDX-License-Identifier: GPL-2.0 +OUTPUT := .output +CLANG ?= clang +LLC ?= llc +LLVM_STRIP ?= llvm-strip +DEFAULT_BPFTOOL := $(OUTPUT)/sbin/bpftool +BPFTOOL ?= $(DEFAULT_BPFTOOL) +LIBBPF_SRC := $(abspath ../../../../tools/lib/bpf) +BPFOBJ := $(OUTPUT)/libbpf.a +BPF_INCLUDE := $(OUTPUT) +INCLUDES := -I$(OUTPUT) -I$(BPF_INCLUDE) -I$(abspath ../../../../tools/lib) \ + -I$(abspath ../../../../tools/include/uapi) +CFLAGS := -g -Wall + +abs_out := $(abspath $(OUTPUT)) +ifeq ($(V),1) +Q = +msg = +else +Q = @ +msg = @printf ' %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))"; +MAKEFLAGS += --no-print-directory +submake_extras := feature_display=0 +endif + +.DELETE_ON_ERROR: + +.PHONY: all clean + +all: iterators.skel.h + +clean: + $(call msg,CLEAN) + $(Q)rm -rf $(OUTPUT) iterators + +iterators.skel.h: $(OUTPUT)/iterators.bpf.o | $(BPFTOOL) + $(call msg,GEN-SKEL,$@) + $(Q)$(BPFTOOL) gen skeleton $< > $@ + + +$(OUTPUT)/iterators.bpf.o: iterators.bpf.c $(BPFOBJ) | $(OUTPUT) + $(call msg,BPF,$@) + $(Q)$(CLANG) -g -O2 -target bpf $(INCLUDES) \ + -c $(filter %.c,$^) -o $@ && \ + $(LLVM_STRIP) -g $@ + +$(OUTPUT): + $(call msg,MKDIR,$@) + $(Q)mkdir -p $(OUTPUT) + +$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(OUTPUT) + $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) \ + OUTPUT=$(abspath $(dir $@))/ $(abspath $@) + +$(DEFAULT_BPFTOOL): + $(Q)$(MAKE) $(submake_extras) -C ../../../../tools/bpf/bpftool \ + prefix= OUTPUT=$(abs_out)/ DESTDIR=$(abs_out) install diff --git a/kernel/bpf/preload/iterators/README b/kernel/bpf/preload/iterators/README new file mode 100644 index 000000000000..7fd6d39a9ad2 --- /dev/null +++ b/kernel/bpf/preload/iterators/README @@ -0,0 +1,4 @@ +WARNING: +If you change "iterators.bpf.c" do "make -j" in this directory to rebuild "iterators.skel.h". +Make sure to have clang 10 installed. +See Documentation/bpf/bpf_devel_QA.rst diff --git a/kernel/bpf/preload/iterators/iterators.bpf.c b/kernel/bpf/preload/iterators/iterators.bpf.c new file mode 100644 index 000000000000..5ded550b2ed6 --- /dev/null +++ b/kernel/bpf/preload/iterators/iterators.bpf.c @@ -0,0 +1,114 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2020 Facebook */ +#include +#include +#include +#include + +#pragma clang attribute push (__attribute__((preserve_access_index)), apply_to = record) +struct seq_file; +struct bpf_iter_meta { + struct seq_file *seq; + __u64 session_id; + __u64 seq_num; +}; + +struct bpf_map { + __u32 id; + char name[16]; + __u32 max_entries; +}; + +struct bpf_iter__bpf_map { + struct bpf_iter_meta *meta; + struct bpf_map *map; +}; + +struct btf_type { + __u32 name_off; +}; + +struct btf_header { + __u32 str_len; +}; + +struct btf { + const char *strings; + struct btf_type **types; + struct btf_header hdr; +}; + +struct bpf_prog_aux { + __u32 id; + char name[16]; + const char *attach_func_name; + struct bpf_prog *linked_prog; + struct bpf_func_info *func_info; + struct btf *btf; +}; + +struct bpf_prog { + struct bpf_prog_aux *aux; +}; + +struct bpf_iter__bpf_prog { + struct bpf_iter_meta *meta; + struct bpf_prog *prog; +}; +#pragma clang attribute pop + +static const char *get_name(struct btf *btf, long btf_id, const char *fallback) +{ + struct btf_type **types, *t; + unsigned int name_off; + const char *str; + + if (!btf) + return fallback; + str = btf->strings; + types = btf->types; + bpf_probe_read_kernel(&t, sizeof(t), types + btf_id); + name_off = BPF_CORE_READ(t, name_off); + if (name_off >= btf->hdr.str_len) + return fallback; + return str + name_off; +} + +SEC("iter/bpf_map") +int dump_bpf_map(struct bpf_iter__bpf_map *ctx) +{ + struct seq_file *seq = ctx->meta->seq; + __u64 seq_num = ctx->meta->seq_num; + struct bpf_map *map = ctx->map; + + if (!map) + return 0; + + if (seq_num == 0) + BPF_SEQ_PRINTF(seq, " id name max_entries\n"); + + BPF_SEQ_PRINTF(seq, "%4u %-16s%6d\n", map->id, map->name, map->max_entries); + return 0; +} + +SEC("iter/bpf_prog") +int dump_bpf_prog(struct bpf_iter__bpf_prog *ctx) +{ + struct seq_file *seq = ctx->meta->seq; + __u64 seq_num = ctx->meta->seq_num; + struct bpf_prog *prog = ctx->prog; + struct bpf_prog_aux *aux; + + if (!prog) + return 0; + + aux = prog->aux; + if (seq_num == 0) + BPF_SEQ_PRINTF(seq, " id name attached\n"); + + BPF_SEQ_PRINTF(seq, "%4u %-16s %s %s\n", aux->id, + get_name(aux->btf, aux->func_info[0].type_id, aux->name), + aux->attach_func_name, aux->linked_prog->aux->name); + return 0; +} +char LICENSE[] SEC("license") = "GPL"; diff --git a/kernel/bpf/preload/iterators/iterators.skel.h b/kernel/bpf/preload/iterators/iterators.skel.h new file mode 100644 index 000000000000..c3171357dc4f --- /dev/null +++ b/kernel/bpf/preload/iterators/iterators.skel.h @@ -0,0 +1,410 @@ +/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ + +/* THIS FILE IS AUTOGENERATED! */ +#ifndef __ITERATORS_BPF_SKEL_H__ +#define __ITERATORS_BPF_SKEL_H__ + +#include +#include + +struct iterators_bpf { + struct bpf_object_skeleton *skeleton; + struct bpf_object *obj; + struct { + struct bpf_map *rodata; + } maps; + struct { + struct bpf_program *dump_bpf_map; + struct bpf_program *dump_bpf_prog; + } progs; + struct { + struct bpf_link *dump_bpf_map; + struct bpf_link *dump_bpf_prog; + } links; + struct iterators_bpf__rodata { + char dump_bpf_map____fmt[35]; + char dump_bpf_map____fmt_1[14]; + char dump_bpf_prog____fmt[32]; + char dump_bpf_prog____fmt_2[17]; + } *rodata; +}; + +static void +iterators_bpf__destroy(struct iterators_bpf *obj) +{ + if (!obj) + return; + if (obj->skeleton) + bpf_object__destroy_skeleton(obj->skeleton); + free(obj); +} + +static inline int +iterators_bpf__create_skeleton(struct iterators_bpf *obj); + +static inline struct iterators_bpf * +iterators_bpf__open_opts(const struct bpf_object_open_opts *opts) +{ + struct iterators_bpf *obj; + + obj = (typeof(obj))calloc(1, sizeof(*obj)); + if (!obj) + return NULL; + if (iterators_bpf__create_skeleton(obj)) + goto err; + if (bpf_object__open_skeleton(obj->skeleton, opts)) + goto err; + + return obj; +err: + iterators_bpf__destroy(obj); + return NULL; +} + +static inline struct iterators_bpf * +iterators_bpf__open(void) +{ + return iterators_bpf__open_opts(NULL); +} + +static inline int +iterators_bpf__load(struct iterators_bpf *obj) +{ + return bpf_object__load_skeleton(obj->skeleton); +} + +static inline struct iterators_bpf * +iterators_bpf__open_and_load(void) +{ + struct iterators_bpf *obj; + + obj = iterators_bpf__open(); + if (!obj) + return NULL; + if (iterators_bpf__load(obj)) { + iterators_bpf__destroy(obj); + return NULL; + } + return obj; +} + +static inline int +iterators_bpf__attach(struct iterators_bpf *obj) +{ + return bpf_object__attach_skeleton(obj->skeleton); +} + +static inline void +iterators_bpf__detach(struct iterators_bpf *obj) +{ + return bpf_object__detach_skeleton(obj->skeleton); +} + +static inline int +iterators_bpf__create_skeleton(struct iterators_bpf *obj) +{ + struct bpf_object_skeleton *s; + + s = (typeof(s))calloc(1, sizeof(*s)); + if (!s) + return -1; + obj->skeleton = s; + + s->sz = sizeof(*s); + s->name = "iterators_bpf"; + s->obj = &obj->obj; + + /* maps */ + s->map_cnt = 1; + s->map_skel_sz = sizeof(*s->maps); + s->maps = (typeof(s->maps))calloc(s->map_cnt, s->map_skel_sz); + if (!s->maps) + goto err; + + s->maps[0].name = "iterator.rodata"; + s->maps[0].map = &obj->maps.rodata; + s->maps[0].mmaped = (void **)&obj->rodata; + + /* programs */ + s->prog_cnt = 2; + s->prog_skel_sz = sizeof(*s->progs); + s->progs = (typeof(s->progs))calloc(s->prog_cnt, s->prog_skel_sz); + if (!s->progs) + goto err; + + s->progs[0].name = "dump_bpf_map"; + s->progs[0].prog = &obj->progs.dump_bpf_map; + s->progs[0].link = &obj->links.dump_bpf_map; + + s->progs[1].name = "dump_bpf_prog"; + s->progs[1].prog = &obj->progs.dump_bpf_prog; + s->progs[1].link = &obj->links.dump_bpf_prog; + + s->data_sz = 7128; + s->data = (void *)"\ +\x7f\x45\x4c\x46\x02\x01\x01\0\0\0\0\0\0\0\0\0\x01\0\xf7\0\x01\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\x18\x18\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0f\0\ +\x0e\0\x79\x12\0\0\0\0\0\0\x79\x26\0\0\0\0\0\0\x79\x17\x08\0\0\0\0\0\x15\x07\ +\x1a\0\0\0\0\0\x79\x21\x10\0\0\0\0\0\x55\x01\x08\0\0\0\0\0\xbf\xa4\0\0\0\0\0\0\ +\x07\x04\0\0\xe8\xff\xff\xff\xbf\x61\0\0\0\0\0\0\x18\x02\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\xb7\x03\0\0\x23\0\0\0\xb7\x05\0\0\0\0\0\0\x85\0\0\0\x7e\0\0\0\x61\x71\0\ +\0\0\0\0\0\x7b\x1a\xe8\xff\0\0\0\0\xb7\x01\0\0\x04\0\0\0\xbf\x72\0\0\0\0\0\0\ +\x0f\x12\0\0\0\0\0\0\x7b\x2a\xf0\xff\0\0\0\0\x61\x71\x14\0\0\0\0\0\x7b\x1a\xf8\ +\xff\0\0\0\0\xbf\xa4\0\0\0\0\0\0\x07\x04\0\0\xe8\xff\xff\xff\xbf\x61\0\0\0\0\0\ +\0\x18\x02\0\0\x23\0\0\0\0\0\0\0\0\0\0\0\xb7\x03\0\0\x0e\0\0\0\xb7\x05\0\0\x18\ 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