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tools/bpftool: Generalize BPF skeleton support and generate vmlinux.h
Adapt Makefile to support BPF skeleton generation beyond single profiler.bpf.c case. Also add vmlinux.h generation and switch profiler.bpf.c to use it. clang-bpf-global-var feature is extended and renamed to clang-bpf-co-re to check for support of preserve_access_index attribute, which, together with BTF for global variables, is the minimum requirement for modern BPF programs. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Reviewed-by: Quentin Monnet <quentin@isovalent.com> Link: https://lore.kernel.org/bpf/20200619231703.738941-7-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
Alexei Starovoitov
parent
16e9b187ab
commit
05aca6da3b
3
tools/bpf/bpftool/.gitignore
vendored
3
tools/bpf/bpftool/.gitignore
vendored
@ -7,4 +7,5 @@ bpf-helpers.*
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FEATURE-DUMP.bpftool
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feature
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libbpf
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profiler.skel.h
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/*.skel.h
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/vmlinux.h
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@ -42,6 +42,7 @@ CFLAGS += -O2
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CFLAGS += -W -Wall -Wextra -Wno-unused-parameter -Wno-missing-field-initializers
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CFLAGS += $(filter-out -Wswitch-enum,$(EXTRA_WARNINGS))
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CFLAGS += -DPACKAGE='"bpftool"' -D__EXPORTED_HEADERS__ \
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-I$(if $(OUTPUT),$(OUTPUT),.) \
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-I$(srctree)/kernel/bpf/ \
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-I$(srctree)/tools/include \
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-I$(srctree)/tools/include/uapi \
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@ -61,9 +62,9 @@ CLANG ?= clang
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FEATURE_USER = .bpftool
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FEATURE_TESTS = libbfd disassembler-four-args reallocarray zlib libcap \
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clang-bpf-global-var
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clang-bpf-co-re
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FEATURE_DISPLAY = libbfd disassembler-four-args zlib libcap \
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clang-bpf-global-var
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clang-bpf-co-re
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check_feat := 1
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NON_CHECK_FEAT_TARGETS := clean uninstall doc doc-clean doc-install doc-uninstall
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@ -121,20 +122,38 @@ BPFTOOL_BOOTSTRAP := $(if $(OUTPUT),$(OUTPUT)bpftool-bootstrap,./bpftool-bootstr
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BOOTSTRAP_OBJS = $(addprefix $(OUTPUT),main.o common.o json_writer.o gen.o btf.o)
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OBJS = $(patsubst %.c,$(OUTPUT)%.o,$(SRCS)) $(OUTPUT)disasm.o
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ifneq ($(feature-clang-bpf-global-var),1)
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CFLAGS += -DBPFTOOL_WITHOUT_SKELETONS
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endif
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VMLINUX_BTF_PATHS := $(if $(O),$(O)/vmlinux) \
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$(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \
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../../../vmlinux \
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/sys/kernel/btf/vmlinux \
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/boot/vmlinux-$(shell uname -r)
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VMLINUX_BTF := $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
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skeleton/profiler.bpf.o: skeleton/profiler.bpf.c $(LIBBPF)
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ifneq ($(VMLINUX_BTF),)
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ifeq ($(feature-clang-bpf-co-re),1)
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BUILD_BPF_SKELS := 1
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$(OUTPUT)vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL_BOOTSTRAP)
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$(QUIET_GEN)$(BPFTOOL_BOOTSTRAP) btf dump file $< format c > $@
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$(OUTPUT)%.bpf.o: skeleton/%.bpf.c $(OUTPUT)vmlinux.h $(LIBBPF)
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$(QUIET_CLANG)$(CLANG) \
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-I$(if $(OUTPUT),$(OUTPUT),.) \
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-I$(srctree)/tools/include/uapi/ \
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-I$(LIBBPF_PATH) -I$(srctree)/tools/lib \
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-I$(LIBBPF_PATH) \
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-I$(srctree)/tools/lib \
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-g -O2 -target bpf -c $< -o $@
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profiler.skel.h: $(BPFTOOL_BOOTSTRAP) skeleton/profiler.bpf.o
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$(QUIET_GEN)$(BPFTOOL_BOOTSTRAP) gen skeleton skeleton/profiler.bpf.o > $@
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$(OUTPUT)%.skel.h: $(OUTPUT)%.bpf.o $(BPFTOOL_BOOTSTRAP)
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$(QUIET_GEN)$(BPFTOOL_BOOTSTRAP) gen skeleton $< > $@
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$(OUTPUT)prog.o: prog.c profiler.skel.h
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$(OUTPUT)prog.o: $(OUTPUT)profiler.skel.h
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endif
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endif
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CFLAGS += $(if BUILD_BPF_SKELS,,-DBPFTOOL_WITHOUT_SKELETONS)
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$(OUTPUT)disasm.o: $(srctree)/kernel/bpf/disasm.c
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$(QUIET_CC)$(CC) $(CFLAGS) -c -MMD -o $@ $<
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@ -153,7 +172,7 @@ $(OUTPUT)%.o: %.c
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clean: $(LIBBPF)-clean
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$(call QUIET_CLEAN, bpftool)
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$(Q)$(RM) -- $(OUTPUT)bpftool $(OUTPUT)*.o $(OUTPUT)*.d
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$(Q)$(RM) -- $(BPFTOOL_BOOTSTRAP) profiler.skel.h skeleton/profiler.bpf.o
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$(Q)$(RM) -- $(BPFTOOL_BOOTSTRAP) $(OUTPUT)*.skel.h $(OUTPUT)vmlinux.h
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$(Q)$(RM) -r -- $(OUTPUT)libbpf/
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$(call QUIET_CLEAN, core-gen)
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$(Q)$(RM) -- $(OUTPUT)FEATURE-DUMP.bpftool
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@ -188,6 +207,7 @@ FORCE:
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zdep:
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@if [ "$(feature-zlib)" != "1" ]; then echo "No zlib found"; exit 1 ; fi
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.SECONDARY:
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.PHONY: all FORCE clean install uninstall zdep
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.PHONY: doc doc-clean doc-install doc-uninstall
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.DEFAULT_GOAL := all
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@ -1,7 +1,6 @@
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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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// Copyright (c) 2020 Facebook
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#include "profiler.h"
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#include <linux/bpf.h>
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#include <vmlinux.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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@ -1,46 +0,0 @@
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/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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#ifndef __PROFILER_H
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#define __PROFILER_H
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/* useful typedefs from vmlinux.h */
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typedef signed char __s8;
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typedef unsigned char __u8;
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typedef short int __s16;
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typedef short unsigned int __u16;
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typedef int __s32;
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typedef unsigned int __u32;
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typedef long long int __s64;
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typedef long long unsigned int __u64;
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typedef __s8 s8;
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typedef __u8 u8;
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typedef __s16 s16;
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typedef __u16 u16;
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typedef __s32 s32;
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typedef __u32 u32;
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typedef __s64 s64;
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typedef __u64 u64;
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enum {
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false = 0,
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true = 1,
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};
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#ifdef __CHECKER__
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#define __bitwise__ __attribute__((bitwise))
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#else
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#define __bitwise__
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#endif
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typedef __u16 __bitwise__ __le16;
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typedef __u16 __bitwise__ __be16;
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typedef __u32 __bitwise__ __le32;
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typedef __u32 __bitwise__ __be32;
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typedef __u64 __bitwise__ __le64;
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typedef __u64 __bitwise__ __be64;
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typedef __u16 __bitwise__ __sum16;
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typedef __u32 __bitwise__ __wsum;
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#endif /* __PROFILER_H */
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@ -68,7 +68,7 @@ FILES= \
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test-llvm-version.bin \
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test-libaio.bin \
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test-libzstd.bin \
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test-clang-bpf-global-var.bin \
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test-clang-bpf-co-re.bin \
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test-file-handle.bin \
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test-libpfm4.bin
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@ -325,7 +325,7 @@ $(OUTPUT)test-libaio.bin:
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$(OUTPUT)test-libzstd.bin:
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$(BUILD) -lzstd
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$(OUTPUT)test-clang-bpf-global-var.bin:
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$(OUTPUT)test-clang-bpf-co-re.bin:
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$(CLANG) -S -g -target bpf -o - $(patsubst %.bin,%.c,$(@F)) | \
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grep BTF_KIND_VAR
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9
tools/build/feature/test-clang-bpf-co-re.c
Normal file
9
tools/build/feature/test-clang-bpf-co-re.c
Normal file
@ -0,0 +1,9 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2020 Facebook
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struct test {
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int a;
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int b;
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} __attribute__((preserve_access_index));
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volatile struct test global_value_for_test = {};
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@ -1,4 +0,0 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2020 Facebook
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volatile int global_value_for_test = 1;
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