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Date: Fri, 26 Jun 2020 14:09:53 -0700
From: Yonghong Song <yhs@...com>
To: Jiri Olsa <jolsa@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>
CC: <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
Song Liu <songliubraving@...com>,
Martin KaFai Lau <kafai@...com>,
David Miller <davem@...hat.com>,
John Fastabend <john.fastabend@...il.com>,
Wenbo Zhang <ethercflow@...il.com>,
KP Singh <kpsingh@...omium.org>,
Andrii Nakryiko <andriin@...com>,
Brendan Gregg <bgregg@...flix.com>,
Florent Revest <revest@...omium.org>,
Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v4 bpf-next 01/14] bpf: Add resolve_btfids tool to resolve
BTF IDs in ELF object
On 6/25/20 3:12 PM, Jiri Olsa wrote:
> The resolve_btfids tool scans elf object for .BTF_ids section
> and resolves its symbols with BTF ID values.
>
> It will be used to during linking time to resolve arrays of BTF
> ID values used in verifier, so these IDs do not need to be
> resolved in runtime.
>
> The expected layout of .BTF_ids section is described in btfid.c
> header. Related kernel changes are coming in following changes.
>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
> tools/bpf/resolve_btfids/Build | 26 ++
> tools/bpf/resolve_btfids/Makefile | 76 ++++
> tools/bpf/resolve_btfids/main.c | 716 ++++++++++++++++++++++++++++++
> 3 files changed, 818 insertions(+)
> create mode 100644 tools/bpf/resolve_btfids/Build
> create mode 100644 tools/bpf/resolve_btfids/Makefile
> create mode 100644 tools/bpf/resolve_btfids/main.c
>
> diff --git a/tools/bpf/resolve_btfids/Build b/tools/bpf/resolve_btfids/Build
> new file mode 100644
> index 000000000000..c7318cc55341
> --- /dev/null
> +++ b/tools/bpf/resolve_btfids/Build
> @@ -0,0 +1,26 @@
> +resolve_btfids-y += main.o
> +resolve_btfids-y += rbtree.o
> +resolve_btfids-y += zalloc.o
> +resolve_btfids-y += string.o
> +resolve_btfids-y += ctype.o
> +resolve_btfids-y += str_error_r.o
> +
> +$(OUTPUT)rbtree.o: ../../lib/rbtree.c FORCE
> + $(call rule_mkdir)
> + $(call if_changed_dep,cc_o_c)
> +
> +$(OUTPUT)zalloc.o: ../../lib/zalloc.c FORCE
> + $(call rule_mkdir)
> + $(call if_changed_dep,cc_o_c)
> +
> +$(OUTPUT)string.o: ../../lib/string.c FORCE
> + $(call rule_mkdir)
> + $(call if_changed_dep,cc_o_c)
> +
> +$(OUTPUT)ctype.o: ../../lib/ctype.c FORCE
> + $(call rule_mkdir)
> + $(call if_changed_dep,cc_o_c)
> +
> +$(OUTPUT)str_error_r.o: ../../lib/str_error_r.c FORCE
> + $(call rule_mkdir)
> + $(call if_changed_dep,cc_o_c)
> diff --git a/tools/bpf/resolve_btfids/Makefile b/tools/bpf/resolve_btfids/Makefile
> new file mode 100644
> index 000000000000..f6502ff26573
> --- /dev/null
> +++ b/tools/bpf/resolve_btfids/Makefile
> @@ -0,0 +1,76 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +
> +ifeq ($(srctree),)
> +srctree := $(patsubst %/,%,$(dir $(CURDIR)))
> +srctree := $(patsubst %/,%,$(dir $(srctree)))
> +srctree := $(patsubst %/,%,$(dir $(srctree)))
> +endif
> +
> +ifeq ($(V),1)
> + Q =
> + msg =
> +else
> + Q = @
> + msg = @printf ' %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";
> + MAKEFLAGS=--no-print-directory
> +endif
> +
> +OUTPUT := $(srctree)/tools/bpf/resolve_btfids/
> +
> +LIBBPF_SRC := $(srctree)/tools/lib/bpf/
> +SUBCMD_SRC := $(srctree)/tools/lib/subcmd/
> +
> +BPFOBJ := $(OUTPUT)/libbpf.a
> +SUBCMDOBJ := $(OUTPUT)/libsubcmd.a
> +
> +BINARY := $(OUTPUT)/resolve_btfids
> +BINARY_IN := $(BINARY)-in.o
> +
> +all: $(BINARY)
> +
> +$(OUTPUT):
> + $(call msg,MKDIR,,$@)
> + $(Q)mkdir -p $(OUTPUT)
> +
> +$(SUBCMDOBJ): fixdep FORCE
> + $(Q)$(MAKE) -C $(SUBCMD_SRC) OUTPUT=$(OUTPUT)
> +
> +$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(OUTPUT)
> + $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) OUTPUT=$(abspath $(dir $@))/ $(abspath $@)
> +
> +CFLAGS := -g \
> + -I$(srctree)/tools/include \
> + -I$(srctree)/tools/include/uapi \
> + -I$(LIBBPF_SRC) \
> + -I$(SUBCMD_SRC)
> +
> +LIBS = -lelf -lz
> +
> +export srctree OUTPUT CFLAGS Q
> +include $(srctree)/tools/build/Makefile.include
> +
> +$(BINARY_IN): fixdep FORCE
> + $(Q)$(MAKE) $(build)=resolve_btfids
> +
> +$(BINARY): $(BPFOBJ) $(SUBCMDOBJ) $(BINARY_IN)
> + $(call msg,LINK,$@)
> + $(Q)$(CC) $(BINARY_IN) $(LDFLAGS) -o $@ $(BPFOBJ) $(SUBCMDOBJ) $(LIBS)
> +
> +libsubcmd-clean:
> + $(Q)$(MAKE) -C $(SUBCMD_SRC) OUTPUT=$(OUTPUT) clean
> +
> +libbpf-clean:
> + $(Q)$(MAKE) -C $(LIBBPF_SRC) OUTPUT=$(OUTPUT) clean
> +
> +clean: libsubcmd-clean libbpf-clean fixdep-clean
> + $(call msg,CLEAN,$(BINARY))
> + $(Q)$(RM) -f $(BINARY); \
> + find $(if $(OUTPUT),$(OUTPUT),.) -name \*.o -or -name \*.o.cmd -or -name \*.o.d | xargs $(RM)
> +
> +tags:
> + $(call msg,GEN,,tags)
> + $(Q)ctags -R . $(LIBBPF_SRC) $(SUBCMD_SRC)
> +
> +FORCE:
> +
> +.PHONY: all FORCE clean tags
After applying the whole patch set to my bpf-next tree locally, I cannot
build:
-bash-4.4$ make -j100 && make vmlinux
GEN Makefile
DESCEND objtool
DESCEND bpf/resolve_btfids
make[4]: *** No rule to make target
`/data/users/yhs/work/net-next/tools/bpf/resolve_btfids/fixdep'. Stop.
make[3]: *** [fixdep] Error 2
make[2]: *** [bpf/resolve_btfids] Error 2
make[1]: *** [tools/bpf/resolve_btfids] Error 2
make[1]: *** Waiting for unfinished jobs....
make[1]: *** wait: No child processes. Stop.
make: *** [__sub-make] Error 2
-bash-4.4$
Any clue what is the possible issue here?
> diff --git a/tools/bpf/resolve_btfids/main.c b/tools/bpf/resolve_btfids/main.c
> new file mode 100644
> index 000000000000..d758e2bdbc9d
> --- /dev/null
> +++ b/tools/bpf/resolve_btfids/main.c
> @@ -0,0 +1,716 @@
> +// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
> +
> +/*
> + * resolve_btfids scans Elf object for .BTF_ids section and resolves
[...]
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