[PATCH v4 bpf-next 04/14] bpf: Resolve BTF IDs in vmlinux image
From: Jiri Olsa <jolsa@kernel.org>
Date: 2020-06-25 22:13:39
Also in:
bpf
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [networking] (tcx & tc bpf, sock_addr), bpf [security & lsm] (security audit and enforcement using bpf), bpf [tracing], kernel build + files below scripts/ (unless maintained elsewhere), networking [general], the rest, tracing · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Martin KaFai Lau, KP Singh, Matt Bobrowski, Song Liu, Nathan Chancellor, Nicolas Schier, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Steven Rostedt, Masami Hiramatsu
Using BTF_ID_LIST macro to define lists for several helpers using BTF arguments. And running resolve_btfids on vmlinux elf object during linking, so the .BTF_ids section gets the IDs resolved. Signed-off-by: Jiri Olsa <jolsa@kernel.org> --- Makefile | 3 ++- kernel/trace/bpf_trace.c | 9 +++++++-- net/core/filter.c | 9 +++++++-- scripts/link-vmlinux.sh | 6 ++++++ 4 files changed, 22 insertions(+), 5 deletions(-)
diff --git a/Makefile b/Makefile
index 8db4fd8097e0..def58d4f9ed7 100644
--- a/Makefile
+++ b/Makefile@@ -448,6 +448,7 @@ OBJSIZE = $(CROSS_COMPILE)size STRIP = $(CROSS_COMPILE)strip endif PAHOLE = pahole +RESOLVE_BTFIDS = $(srctree)/tools/bpf/resolve_btfids/resolve_btfids LEX = flex YACC = bison AWK = awk
@@ -510,7 +511,7 @@ GCC_PLUGINS_CFLAGS := CLANG_FLAGS := export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC -export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL +export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 5d59dda5f661..b124d468688c 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c@@ -13,6 +13,7 @@ #include <linux/kprobes.h> #include <linux/syscalls.h> #include <linux/error-injection.h> +#include <linux/btf_ids.h> #include <asm/tlb.h>
@@ -704,7 +705,9 @@ BPF_CALL_5(bpf_seq_printf, struct seq_file *, m, char *, fmt, u32, fmt_size, return err; } -static int bpf_seq_printf_btf_ids[5]; +BTF_ID_LIST(bpf_seq_printf_btf_ids) +BTF_ID(struct, seq_file) + static const struct bpf_func_proto bpf_seq_printf_proto = { .func = bpf_seq_printf, .gpl_only = true,
@@ -722,7 +725,9 @@ BPF_CALL_3(bpf_seq_write, struct seq_file *, m, const void *, data, u32, len) return seq_write(m, data, len) ? -EOVERFLOW : 0; } -static int bpf_seq_write_btf_ids[5]; +BTF_ID_LIST(bpf_seq_write_btf_ids) +BTF_ID(struct, seq_file) + static const struct bpf_func_proto bpf_seq_write_proto = { .func = bpf_seq_write, .gpl_only = true,
diff --git a/net/core/filter.c b/net/core/filter.c
index c796e141ea8e..2f0dc67454cc 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c@@ -75,6 +75,7 @@ #include <net/ipv6_stubs.h> #include <net/bpf_sk_storage.h> #include <net/transp_v6.h> +#include <linux/btf_ids.h> /** * sk_filter_trim_cap - run a packet through a socket filter
@@ -3779,7 +3780,9 @@ static const struct bpf_func_proto bpf_skb_event_output_proto = { .arg5_type = ARG_CONST_SIZE_OR_ZERO, }; -static int bpf_skb_output_btf_ids[5]; +BTF_ID_LIST(bpf_skb_output_btf_ids) +BTF_ID(struct, sk_buff) + const struct bpf_func_proto bpf_skb_output_proto = { .func = bpf_skb_event_output, .gpl_only = true,
@@ -4173,7 +4176,9 @@ static const struct bpf_func_proto bpf_xdp_event_output_proto = { .arg5_type = ARG_CONST_SIZE_OR_ZERO, }; -static int bpf_xdp_output_btf_ids[5]; +BTF_ID_LIST(bpf_xdp_output_btf_ids) +BTF_ID(struct, xdp_buff) + const struct bpf_func_proto bpf_xdp_output_proto = { .func = bpf_xdp_event_output, .gpl_only = true,
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 92dd745906f4..e26f02dbedee 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh@@ -336,6 +336,12 @@ fi vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o} +# fill in BTF IDs +if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then +info BTFIDS vmlinux +${RESOLVE_BTFIDS} vmlinux +fi + if [ -n "${CONFIG_BUILDTIME_TABLE_SORT}" ]; then info SORTTAB vmlinux if ! sorttable vmlinux; then
--
2.25.4