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-rw-r--r--tools/lib/bpf/Makefile310
1 files changed, 181 insertions, 129 deletions
diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index 34d9c3619c96..168140f8e646 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -1,34 +1,29 @@
# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
# Most of this file is copied from tools/lib/traceevent/Makefile
-BPF_VERSION = 0
-BPF_PATCHLEVEL = 0
-BPF_EXTRAVERSION = 1
+RM ?= rm
+srctree := $(realpath $(srctree))
+
+VERSION_SCRIPT := libbpf.map
+LIBBPF_VERSION := $(shell \
+ grep -oE '^LIBBPF_([0-9.]+)' $(VERSION_SCRIPT) | \
+ sort -rV | head -n1 | cut -d'_' -f2)
+LIBBPF_MAJOR_VERSION := $(word 1,$(subst ., ,$(LIBBPF_VERSION)))
+LIBBPF_MINOR_VERSION := $(word 2,$(subst ., ,$(LIBBPF_VERSION)))
MAKEFLAGS += --no-print-directory
-ifeq ($(srctree),)
+# This will work when bpf is built in tools env. where srctree
+# isn't set and when invoked from selftests build, where srctree
+# is a ".". building_out_of_srctree is undefined for in srctree
+# builds
+ifndef building_out_of_srctree
srctree := $(patsubst %/,%,$(dir $(CURDIR)))
srctree := $(patsubst %/,%,$(dir $(srctree)))
srctree := $(patsubst %/,%,$(dir $(srctree)))
#$(info Determined 'srctree' to be $(srctree))
endif
-# Makefiles suck: This macro sets a default value of $(2) for the
-# variable named by $(1), unless the variable has been set by
-# environment or command line. This is necessary for CC and AR
-# because make sets default values, so the simpler ?= approach
-# won't work as expected.
-define allow-override
- $(if $(or $(findstring environment,$(origin $(1))),\
- $(findstring command line,$(origin $(1)))),,\
- $(eval $(1) = $(2)))
-endef
-
-# Allow setting CC and AR, or setting CROSS_COMPILE as a prefix.
-$(call allow-override,CC,$(CROSS_COMPILE)gcc)
-$(call allow-override,AR,$(CROSS_COMPILE)ar)
-
INSTALL = install
# Use DESTDIR for installing into a different root directory.
@@ -54,39 +49,13 @@ man_dir_SQ = '$(subst ','\'',$(man_dir))'
export man_dir man_dir_SQ INSTALL
export DESTDIR DESTDIR_SQ
-include ../../scripts/Makefile.include
+include $(srctree)/tools/scripts/Makefile.include
# copy a bit from Linux kbuild
-ifeq ("$(origin V)", "command line")
- VERBOSE = $(V)
-endif
-ifndef VERBOSE
- VERBOSE = 0
-endif
-
-FEATURE_USER = .libbpf
-FEATURE_TESTS = libelf libelf-mmap bpf reallocarray cxx
-FEATURE_DISPLAY = libelf bpf
-
-INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi
-FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
-
-check_feat := 1
-NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help
-ifdef MAKECMDGOALS
-ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
- check_feat := 0
-endif
-endif
-
-ifeq ($(check_feat),1)
-ifeq ($(FEATURES_DUMP),)
-include $(srctree)/tools/build/Makefile.feature
-else
-include $(FEATURES_DUMP)
-endif
-endif
+INCLUDES = -I$(or $(OUTPUT),.) \
+ -I$(srctree)/tools/include -I$(srctree)/tools/include/uapi \
+ -I$(srctree)/tools/arch/$(SRCARCH)/include
export prefix libdir src obj
@@ -94,44 +63,31 @@ export prefix libdir src obj
libdir_SQ = $(subst ','\'',$(libdir))
libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
-LIB_FILE = libbpf.a libbpf.so
-
-VERSION = $(BPF_VERSION)
-PATCHLEVEL = $(BPF_PATCHLEVEL)
-EXTRAVERSION = $(BPF_EXTRAVERSION)
-
OBJ = $@
N =
-LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
+LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION)
+LIB_FILE = libbpf.a libbpf.so*
+PC_FILE = libbpf.pc
# Set compile option CFLAGS
ifdef EXTRA_CFLAGS
CFLAGS := $(EXTRA_CFLAGS)
else
- CFLAGS := -g -Wall
-endif
-
-ifeq ($(feature-libelf-mmap), 1)
- override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
-endif
-
-ifeq ($(feature-reallocarray), 0)
- override CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
+ CFLAGS := -g -O2
endif
# Append required CFLAGS
-override CFLAGS += $(EXTRA_WARNINGS)
+override CFLAGS += -std=gnu89
+override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum
override CFLAGS += -Werror -Wall
-override CFLAGS += -fPIC
override CFLAGS += $(INCLUDES)
override CFLAGS += -fvisibility=hidden
+override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
+override CFLAGS += $(CLANG_CROSS_FLAGS)
-ifeq ($(VERBOSE),1)
- Q =
-else
- Q = @
-endif
+# flags specific for shared library
+SHLIB_FLAGS := -DSHARED -fPIC
# Disable command line variables (CFLAGS) override from top
# level Makefile (perf), otherwise build Makefile will get
@@ -140,110 +96,206 @@ MAKEOVERRIDES=
all:
+OUTPUT ?= ./
+OUTPUT := $(abspath $(OUTPUT))/
export srctree OUTPUT CC LD CFLAGS V
include $(srctree)/tools/build/Makefile.include
-BPF_IN := $(OUTPUT)libbpf-in.o
-LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
-VERSION_SCRIPT := libbpf.map
-
-GLOBAL_SYM_COUNT = $(shell readelf -s $(BPF_IN) | \
- awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {s++} END{print s}')
-VERSIONED_SYM_COUNT = $(shell readelf -s $(OUTPUT)libbpf.so | \
+SHARED_OBJDIR := $(OUTPUT)sharedobjs/
+STATIC_OBJDIR := $(OUTPUT)staticobjs/
+BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o
+BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o
+BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h
+BPF_GENERATED := $(BPF_HELPER_DEFS)
+
+LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET))
+LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
+PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE))
+
+TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags)
+
+GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN_SHARED) | \
+ cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
+ sed 's/\[.*\]//' | \
+ awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \
+ sort -u | wc -l)
+VERSIONED_SYM_COUNT = $(shell readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
+ sed 's/\[.*\]//' | \
+ awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \
grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
-CMD_TARGETS = $(LIB_FILE)
-
-CXX_TEST_TARGET = $(OUTPUT)test_libbpf
+CMD_TARGETS = $(LIB_TARGET) $(PC_FILE)
-ifeq ($(feature-cxx), 1)
- CMD_TARGETS += $(CXX_TEST_TARGET)
-endif
-
-TARGETS = $(CMD_TARGETS)
-
-all: fixdep all_cmd
+all: fixdep
+ $(Q)$(MAKE) all_cmd
all_cmd: $(CMD_TARGETS) check
-$(BPF_IN): force elfdep bpfdep
+$(SHARED_OBJDIR) $(STATIC_OBJDIR):
+ $(Q)mkdir -p $@
+
+$(BPF_IN_SHARED): force $(BPF_GENERATED) | $(SHARED_OBJDIR)
@(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
(diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
@(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
(diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf_common.h' differs from latest version at 'include/uapi/linux/bpf_common.h'" >&2 )) || true
- @(test -f ../../include/uapi/linux/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \
- (diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \
- echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true
- @(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \
- (diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \
- echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/if_link.h' differs from latest version at 'include/uapi/linux/if_link.h'" >&2 )) || true
- $(Q)$(MAKE) $(build)=libbpf
+ @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \
+ (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \
+ echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/if_xdp.h' differs from latest version at 'include/uapi/linux/if_xdp.h'" >&2 )) || true
+ $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(SHARED_OBJDIR) $(SHARED_OBJDIR)fixdep
+ $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)"
+
+$(BPF_IN_STATIC): force $(BPF_GENERATED) | $(STATIC_OBJDIR)
+ $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(STATIC_OBJDIR) $(STATIC_OBJDIR)fixdep
+ $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)
+
+$(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h
+ $(QUIET_GEN)$(srctree)/scripts/bpf_doc.py --header \
+ --file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS)
-$(OUTPUT)libbpf.so: $(BPF_IN)
- $(QUIET_LINK)$(CC) --shared -Wl,--version-script=$(VERSION_SCRIPT) \
- $^ -o $@
+$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
-$(OUTPUT)libbpf.a: $(BPF_IN)
- $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
+$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) $(VERSION_SCRIPT)
+ $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) \
+ --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
+ -Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -o $@
+ @ln -sf $(@F) $(OUTPUT)libbpf.so
+ @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION)
-$(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a
- $(QUIET_LINK)$(CXX) $^ -lelf -o $@
+$(OUTPUT)libbpf.a: $(BPF_IN_STATIC)
+ $(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ $^
-check: check_abi
+$(OUTPUT)libbpf.pc:
+ $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \
+ -e "s|@LIBDIR@|$(libdir_SQ)|" \
+ -e "s|@VERSION@|$(LIBBPF_VERSION)|" \
+ < libbpf.pc.template > $@
-check_abi: $(OUTPUT)libbpf.so
+check: check_abi check_version
+
+check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT)
@if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \
- echo "Warning: Num of global symbols in $(BPF_IN)" \
+ echo "Warning: Num of global symbols in $(BPF_IN_SHARED)" \
"($(GLOBAL_SYM_COUNT)) does NOT match with num of" \
"versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
"Please make sure all LIBBPF_API symbols are" \
"versioned in $(VERSION_SCRIPT)." >&2; \
+ readelf -s --wide $(BPF_IN_SHARED) | \
+ cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
+ sed 's/\[.*\]//' | \
+ awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \
+ sort -u > $(OUTPUT)libbpf_global_syms.tmp; \
+ readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
+ sed 's/\[.*\]//' | \
+ awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}'| \
+ grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \
+ sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \
+ diff -u $(OUTPUT)libbpf_global_syms.tmp \
+ $(OUTPUT)libbpf_versioned_syms.tmp; \
+ rm $(OUTPUT)libbpf_global_syms.tmp \
+ $(OUTPUT)libbpf_versioned_syms.tmp; \
exit 1; \
fi
+HDR_MAJ_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MAJOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
+HDR_MIN_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MINOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
+
+check_version: $(VERSION_SCRIPT) libbpf_version.h
+ @if [ "$(HDR_MAJ_VERSION)" != "$(LIBBPF_MAJOR_VERSION)" ]; then \
+ echo "Error: libbpf major version mismatch detected: " \
+ "'$(HDR_MAJ_VERSION)' != '$(LIBBPF_MAJOR_VERSION)'" >&2; \
+ exit 1; \
+ fi
+ @if [ "$(HDR_MIN_VERSION)" != "$(LIBBPF_MINOR_VERSION)" ]; then \
+ echo "Error: libbpf minor version mismatch detected: " \
+ "'$(HDR_MIN_VERSION)' != '$(LIBBPF_MINOR_VERSION)'" >&2; \
+ exit 1; \
+ fi
+
+define do_install_mkdir
+ if [ ! -d '$(DESTDIR_SQ)$1' ]; then \
+ $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
+ fi
+endef
+
define do_install
if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
fi; \
- $(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
+ $(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2'
endef
install_lib: all_cmd
- $(call QUIET_INSTALL, $(LIB_FILE)) \
- $(call do_install,$(LIB_FILE),$(libdir_SQ))
+ $(call QUIET_INSTALL, $(LIB_TARGET)) \
+ $(call do_install_mkdir,$(libdir_SQ)); \
+ cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)
-install_headers:
- $(call QUIET_INSTALL, headers) \
- $(call do_install,bpf.h,$(prefix)/include/bpf,644); \
- $(call do_install,libbpf.h,$(prefix)/include/bpf,644);
- $(call do_install,btf.h,$(prefix)/include/bpf,644);
+SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h \
+ bpf_helpers.h bpf_tracing.h bpf_endian.h bpf_core_read.h \
+ skel_internal.h libbpf_version.h usdt.bpf.h
+GEN_HDRS := $(BPF_GENERATED)
-install: install_lib
+INSTALL_PFX := $(DESTDIR)$(prefix)/include/bpf
+INSTALL_SRC_HDRS := $(addprefix $(INSTALL_PFX)/, $(SRC_HDRS))
+INSTALL_GEN_HDRS := $(addprefix $(INSTALL_PFX)/, $(notdir $(GEN_HDRS)))
-### Cleaning rules
+$(INSTALL_SRC_HDRS): $(INSTALL_PFX)/%.h: %.h
+ $(call QUIET_INSTALL, $@) \
+ $(call do_install,$<,$(prefix)/include/bpf,644)
-config-clean:
- $(call QUIET_CLEAN, config)
- $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
+$(INSTALL_GEN_HDRS): $(INSTALL_PFX)/%.h: $(OUTPUT)%.h
+ $(call QUIET_INSTALL, $@) \
+ $(call do_install,$<,$(prefix)/include/bpf,644)
-clean:
- $(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \
- *.o *~ *.a *.so .*.d .*.cmd LIBBPF-CFLAGS
- $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
+install_headers: $(BPF_GENERATED) $(INSTALL_SRC_HDRS) $(INSTALL_GEN_HDRS)
+ $(call QUIET_INSTALL, libbpf_headers)
+install_pkgconfig: $(PC_FILE)
+ $(call QUIET_INSTALL, $(PC_FILE)) \
+ $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644)
+install: install_lib install_pkgconfig install_headers
-PHONY += force elfdep bpfdep
+clean: fixdep-clean
+ $(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \
+ *~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_GENERATED) \
+ $(SHARED_OBJDIR) $(STATIC_OBJDIR) \
+ $(addprefix $(OUTPUT), \
+ *.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc)
+
+PHONY += force cscope tags check check_abi check_version
force:
-elfdep:
- @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi
+cscope:
+ ls *.c *.h > cscope.files
+ cscope -b -q -I $(srctree)/include -f cscope.out
-bpfdep:
- @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi
+tags:
+ $(RM) -f TAGS tags
+ ls *.c *.h | xargs $(TAGS_PROG) -a
# Declare the contents of the .PHONY variable as phony. We keep that
# information in a variable so we can use it in if_changed and friends.
.PHONY: $(PHONY)
+
+# Delete partially updated (corrupted) files on error
+.DELETE_ON_ERROR:
+
+help:
+ @echo 'libbpf common targets:'
+ @echo ' HINT: use "V=1" to enable verbose build'
+ @echo ' all - build libraries and pkgconfig'
+ @echo ' clean - remove all generated files'
+ @echo ' check - check ABI and version info'
+ @echo ''
+ @echo 'libbpf install targets:'
+ @echo ' HINT: use "prefix"(defaults to "/usr/local") or "DESTDIR" (defaults to "/")'
+ @echo ' to adjust target destination, e.g. "make prefix=/usr/local install"'
+ @echo ' install - build and install all headers, libraries and pkgconfig'
+ @echo ' install_headers - install only headers to include/bpf'
+ @echo ''
+ @echo 'libbpf make targets:'
+ @echo ' tags - use ctags to make tag information for source code browsing'
+ @echo ' cscope - use cscope to make interactive source code browsing database'
generated by cgit (git 2.34.1) at 2025-12-26 13:27:57 +0000