From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: davem@davemloft.net
Cc: daniel@iogearbox.net, torvalds@linux-foundation.org,
netdev@vger.kernel.org, bpf@vger.kernel.org, kernel-team@fb.com
Subject: [PATCH v2 bpf-next 3/4] bpf: Add BPF program and map iterators as built-in BPF programs.
Date: Thu, 16 Jul 2020 21:40:30 -0700 [thread overview]
Message-ID: <20200717044031.56412-4-alexei.starovoitov@gmail.com> (raw)
In-Reply-To: <20200717044031.56412-1-alexei.starovoitov@gmail.com>
From: Alexei Starovoitov <ast@kernel.org>
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 pages attached
5 dump_bpf_map 1 bpf_iter_bpf_map
6 dump_bpf_prog 1 bpf_iter_bpf_prog
$ cat /sys/fs/bpf/maps.debug
id name pages
3 iterator.rodata 2
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.
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
---
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 | 82 ++++
kernel/bpf/preload/iterators/iterators.skel.h | 360 ++++++++++++++++++
5 files changed, 505 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..81f7d4376ef9
--- /dev/null
+++ b/kernel/bpf/preload/iterators/iterators.bpf.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020 Facebook */
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+struct seq_file;
+struct bpf_iter_meta {
+ struct seq_file *seq;
+ __u64 session_id;
+ __u64 seq_num;
+} __attribute__((preserve_access_index));
+
+struct bpf_map_memory {
+ __u32 pages;
+} __attribute__((preserve_access_index));
+
+struct bpf_map {
+ __u32 id;
+ struct bpf_map_memory memory;
+ char name[16];
+} __attribute__((preserve_access_index));
+
+struct bpf_iter__bpf_map {
+ struct bpf_iter_meta *meta;
+ struct bpf_map *map;
+} __attribute__((preserve_access_index));
+
+struct bpf_prog_aux {
+ __u32 id;
+ char name[16];
+ const char *attach_func_name;
+ struct bpf_prog *linked_prog;
+} __attribute__((preserve_access_index));
+
+struct bpf_prog {
+ struct bpf_prog_aux *aux;
+ __u16 pages;
+} __attribute__((preserve_access_index));
+
+struct bpf_iter__bpf_prog {
+ struct bpf_iter_meta *meta;
+ struct bpf_prog *prog;
+} __attribute__((preserve_access_index));
+
+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 pages\n");
+
+ BPF_SEQ_PRINTF(seq, "%4u %-16s%6d\n", map->id, map->name, map->memory.pages);
+ 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 pages attached\n");
+
+ BPF_SEQ_PRINTF(seq, "%4u %-16s%6d %s %s\n", aux->id, aux->name, prog->pages,
+ 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..6b9aefd682ea
--- /dev/null
+++ b/kernel/bpf/preload/iterators/iterators.skel.h
@@ -0,0 +1,360 @@
+/* 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 <stdlib.h>
+#include <bpf/libbpf.h>
+
+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[29];
+ char dump_bpf_map____fmt_1[14];
+ char dump_bpf_prog____fmt[38];
+ char dump_bpf_prog____fmt_2[20];
+ } *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 = 5768;
+ s->data = (void *)"\
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+\x6f\0\0\0\x80\0\0\0\0\0\0\0\0\0\0\0\0\xb8\x11\0\0\0\0\0\0\x07\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x91\0\0\0\x03\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\xbf\x11\0\0\0\0\0\0\x03\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
+
+ return 0;
+err:
+ bpf_object__destroy_skeleton(s);
+ return -1;
+}
+
+#endif /* __ITERATORS_BPF_SKEL_H__ */
--
2.23.0
next prev parent reply other threads:[~2020-07-17 4:40 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-17 4:40 [PATCH v2 bpf-next 0/4] bpf: Populate bpffs with map and prog iterators Alexei Starovoitov
2020-07-17 4:40 ` [PATCH v2 bpf-next 1/4] bpf: Add bpf_prog iterator Alexei Starovoitov
2020-07-17 4:40 ` [PATCH v2 bpf-next 2/4] bpf: Factor out bpf_link_get_by_id() helper Alexei Starovoitov
2020-07-17 4:40 ` Alexei Starovoitov [this message]
2020-07-17 4:40 ` [PATCH v2 bpf-next 4/4] bpf: Add kernel module with user mode driver that populates bpffs Alexei Starovoitov
2020-07-19 23:56 ` kernel test robot
2020-07-19 23:56 ` kernel test robot
2020-07-22 22:16 ` Daniel Borkmann
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