* [PATCH v4 bpf-next 0/4] add btf dumping to bpftool
@ 2019-04-25 22:30 Andrii Nakryiko
2019-04-25 22:30 ` [PATCH v4 bpf-next 1/4] bpftool: add ability to dump BTF types Andrii Nakryiko
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: Andrii Nakryiko @ 2019-04-25 22:30 UTC (permalink / raw)
To: andrii.nakryiko, netdev, bpf
This patch set adds a new `bpftool btf dump` sub-command, which allows to dump
BTF contents (only types for now). Currently it only outputs low-level
content, almost 1:1 with binary BTF format, but follow up patches will add
ability to dump BTF types as a compilable C header file. JSON output is
supported as well.
Patch #1 adds `btf` sub-command, dumping BTF types in human-readable format.
It also implements reading .BTF data from ELF file.
Patch #2 adds minimal documentation with output format examples and different
ways to specify source of BTF data.
Patch #3 adds support for btf command in bash-completion/bpftool script.
Patch #4 fixes minor indentation issue in bash-completion script.
Output format is mostly following existing format of BPF verifier log, but
deviates from it in few places. More details are in commit message for patch
#1.
Example of output for all supported BTF kinds are in patch #2 as part of
documentation. Some field names are quite verbose and I'd rather shorten them,
if we don't feel like being very close to BPF verifier names is a necessity,
but in this patch I left them exactly the same as in verifier log.
v3->v4:
- reverse Christmas tree (Quentin)
- better docs (Quentin)
v2->v3:
- make map's key|value|kv|all suggestion more precise (Quentin)
- fix default case indentations (Quentin)
v1->v2:
- fix unnecessary trailing whitespaces in bpftool-btf.rst (Yonghong)
- add btf in main.c for a list of possible OBJECTs
- handle unknown keyword under `bpftool btf dump` (Yonghong)
Andrii Nakryiko (4):
bpftool: add ability to dump BTF types
bpftool/docs: add btf sub-command documentation
bpftool: add bash completions for btf command
bpftool: fix indendation in bash-completion/bpftool
.../bpf/bpftool/Documentation/bpftool-btf.rst | 222 +++++++
.../bpftool/Documentation/bpftool-cgroup.rst | 3 +-
.../bpftool/Documentation/bpftool-feature.rst | 3 +-
.../bpf/bpftool/Documentation/bpftool-map.rst | 3 +-
.../bpf/bpftool/Documentation/bpftool-net.rst | 3 +-
.../bpftool/Documentation/bpftool-perf.rst | 3 +-
.../bpftool/Documentation/bpftool-prog.rst | 3 +-
tools/bpf/bpftool/Documentation/bpftool.rst | 3 +-
tools/bpf/bpftool/bash-completion/bpftool | 68 +-
tools/bpf/bpftool/btf.c | 586 ++++++++++++++++++
tools/bpf/bpftool/main.c | 3 +-
tools/bpf/bpftool/main.h | 1 +
12 files changed, 882 insertions(+), 19 deletions(-)
create mode 100644 tools/bpf/bpftool/Documentation/bpftool-btf.rst
create mode 100644 tools/bpf/bpftool/btf.c
--
2.17.1
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH v4 bpf-next 1/4] bpftool: add ability to dump BTF types
2019-04-25 22:30 [PATCH v4 bpf-next 0/4] add btf dumping to bpftool Andrii Nakryiko
@ 2019-04-25 22:30 ` Andrii Nakryiko
2019-04-25 22:30 ` [PATCH v4 bpf-next 2/4] bpftool/docs: add btf sub-command documentation Andrii Nakryiko
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Andrii Nakryiko @ 2019-04-25 22:30 UTC (permalink / raw)
To: andrii.nakryiko, netdev, bpf
Add new `btf dump` sub-command to bpftool. It allows to dump
human-readable low-level BTF types representation of BTF types. BTF can
be retrieved from few different sources:
- from BTF object by ID;
- from PROG, if it has associated BTF;
- from MAP, if it has associated BTF data; it's possible to narrow
down types to either key type, value type, both, or all BTF types;
- from ELF file (.BTF section).
Output format mostly follows BPF verifier log format with few notable
exceptions:
- all the type/field/param/etc names are enclosed in single quotes to
allow easier grepping and to stand out a little bit more;
- FUNC_PROTO output follows STRUCT/UNION/ENUM format of having one
line per each argument; this is more uniform and allows easy
grepping, as opposed to succinct, but inconvenient format that BPF
verifier log is using.
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Yonghong Song <yhs@fb.com>
Cc: Martin KaFai Lau <kafai@fb.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
---
tools/bpf/bpftool/btf.c | 586 +++++++++++++++++++++++++++++++++++++++
tools/bpf/bpftool/main.c | 3 +-
tools/bpf/bpftool/main.h | 1 +
3 files changed, 589 insertions(+), 1 deletion(-)
create mode 100644 tools/bpf/bpftool/btf.c
diff --git a/tools/bpf/bpftool/btf.c b/tools/bpf/bpftool/btf.c
new file mode 100644
index 000000000000..58a2cd002a4b
--- /dev/null
+++ b/tools/bpf/bpftool/btf.c
@@ -0,0 +1,586 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/* Copyright (C) 2019 Facebook */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/err.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <gelf.h>
+#include <bpf.h>
+#include <linux/btf.h>
+
+#include "btf.h"
+#include "json_writer.h"
+#include "main.h"
+
+static const char * const btf_kind_str[NR_BTF_KINDS] = {
+ [BTF_KIND_UNKN] = "UNKNOWN",
+ [BTF_KIND_INT] = "INT",
+ [BTF_KIND_PTR] = "PTR",
+ [BTF_KIND_ARRAY] = "ARRAY",
+ [BTF_KIND_STRUCT] = "STRUCT",
+ [BTF_KIND_UNION] = "UNION",
+ [BTF_KIND_ENUM] = "ENUM",
+ [BTF_KIND_FWD] = "FWD",
+ [BTF_KIND_TYPEDEF] = "TYPEDEF",
+ [BTF_KIND_VOLATILE] = "VOLATILE",
+ [BTF_KIND_CONST] = "CONST",
+ [BTF_KIND_RESTRICT] = "RESTRICT",
+ [BTF_KIND_FUNC] = "FUNC",
+ [BTF_KIND_FUNC_PROTO] = "FUNC_PROTO",
+ [BTF_KIND_VAR] = "VAR",
+ [BTF_KIND_DATASEC] = "DATASEC",
+};
+
+static const char *btf_int_enc_str(__u8 encoding)
+{
+ switch (encoding) {
+ case 0:
+ return "(none)";
+ case BTF_INT_SIGNED:
+ return "SIGNED";
+ case BTF_INT_CHAR:
+ return "CHAR";
+ case BTF_INT_BOOL:
+ return "BOOL";
+ default:
+ return "UNKN";
+ }
+}
+
+static const char *btf_var_linkage_str(__u32 linkage)
+{
+ switch (linkage) {
+ case BTF_VAR_STATIC:
+ return "static";
+ case BTF_VAR_GLOBAL_ALLOCATED:
+ return "global-alloc";
+ default:
+ return "(unknown)";
+ }
+}
+
+static const char *btf_str(const struct btf *btf, __u32 off)
+{
+ if (!off)
+ return "(anon)";
+ return btf__name_by_offset(btf, off) ? : "(invalid)";
+}
+
+static int dump_btf_type(const struct btf *btf, __u32 id,
+ const struct btf_type *t)
+{
+ json_writer_t *w = json_wtr;
+ int kind, safe_kind;
+
+ kind = BTF_INFO_KIND(t->info);
+ safe_kind = kind <= BTF_KIND_MAX ? kind : BTF_KIND_UNKN;
+
+ if (json_output) {
+ jsonw_start_object(w);
+ jsonw_uint_field(w, "id", id);
+ jsonw_string_field(w, "kind", btf_kind_str[safe_kind]);
+ jsonw_string_field(w, "name", btf_str(btf, t->name_off));
+ } else {
+ printf("[%u] %s '%s'", id, btf_kind_str[safe_kind],
+ btf_str(btf, t->name_off));
+ }
+
+ switch (BTF_INFO_KIND(t->info)) {
+ case BTF_KIND_INT: {
+ __u32 v = *(__u32 *)(t + 1);
+ const char *enc;
+
+ enc = btf_int_enc_str(BTF_INT_ENCODING(v));
+
+ if (json_output) {
+ jsonw_uint_field(w, "size", t->size);
+ jsonw_uint_field(w, "bits_offset", BTF_INT_OFFSET(v));
+ jsonw_uint_field(w, "nr_bits", BTF_INT_BITS(v));
+ jsonw_string_field(w, "encoding", enc);
+ } else {
+ printf(" size=%u bits_offset=%u nr_bits=%u encoding=%s",
+ t->size, BTF_INT_OFFSET(v), BTF_INT_BITS(v),
+ enc);
+ }
+ break;
+ }
+ case BTF_KIND_PTR:
+ case BTF_KIND_CONST:
+ case BTF_KIND_VOLATILE:
+ case BTF_KIND_RESTRICT:
+ case BTF_KIND_TYPEDEF:
+ if (json_output)
+ jsonw_uint_field(w, "type_id", t->type);
+ else
+ printf(" type_id=%u", t->type);
+ break;
+ case BTF_KIND_ARRAY: {
+ const struct btf_array *arr = (const void *)(t + 1);
+
+ if (json_output) {
+ jsonw_uint_field(w, "type_id", arr->type);
+ jsonw_uint_field(w, "index_type_id", arr->index_type);
+ jsonw_uint_field(w, "nr_elems", arr->nelems);
+ } else {
+ printf(" type_id=%u index_type_id=%u nr_elems=%u",
+ arr->type, arr->index_type, arr->nelems);
+ }
+ break;
+ }
+ case BTF_KIND_STRUCT:
+ case BTF_KIND_UNION: {
+ const struct btf_member *m = (const void *)(t + 1);
+ __u16 vlen = BTF_INFO_VLEN(t->info);
+ int i;
+
+ if (json_output) {
+ jsonw_uint_field(w, "size", t->size);
+ jsonw_uint_field(w, "vlen", vlen);
+ jsonw_name(w, "members");
+ jsonw_start_array(w);
+ } else {
+ printf(" size=%u vlen=%u", t->size, vlen);
+ }
+ for (i = 0; i < vlen; i++, m++) {
+ const char *name = btf_str(btf, m->name_off);
+ __u32 bit_off, bit_sz;
+
+ if (BTF_INFO_KFLAG(t->info)) {
+ bit_off = BTF_MEMBER_BIT_OFFSET(m->offset);
+ bit_sz = BTF_MEMBER_BITFIELD_SIZE(m->offset);
+ } else {
+ bit_off = m->offset;
+ bit_sz = 0;
+ }
+
+ if (json_output) {
+ jsonw_start_object(w);
+ jsonw_string_field(w, "name", name);
+ jsonw_uint_field(w, "type_id", m->type);
+ jsonw_uint_field(w, "bits_offset", bit_off);
+ if (bit_sz) {
+ jsonw_uint_field(w, "bitfield_size",
+ bit_sz);
+ }
+ jsonw_end_object(w);
+ } else {
+ printf("\n\t'%s' type_id=%u bits_offset=%u",
+ name, m->type, bit_off);
+ if (bit_sz)
+ printf(" bitfield_size=%u", bit_sz);
+ }
+ }
+ if (json_output)
+ jsonw_end_array(w);
+ break;
+ }
+ case BTF_KIND_ENUM: {
+ const struct btf_enum *v = (const void *)(t + 1);
+ __u16 vlen = BTF_INFO_VLEN(t->info);
+ int i;
+
+ if (json_output) {
+ jsonw_uint_field(w, "size", t->size);
+ jsonw_uint_field(w, "vlen", vlen);
+ jsonw_name(w, "values");
+ jsonw_start_array(w);
+ } else {
+ printf(" size=%u vlen=%u", t->size, vlen);
+ }
+ for (i = 0; i < vlen; i++, v++) {
+ const char *name = btf_str(btf, v->name_off);
+
+ if (json_output) {
+ jsonw_start_object(w);
+ jsonw_string_field(w, "name", name);
+ jsonw_uint_field(w, "val", v->val);
+ jsonw_end_object(w);
+ } else {
+ printf("\n\t'%s' val=%u", name, v->val);
+ }
+ }
+ if (json_output)
+ jsonw_end_array(w);
+ break;
+ }
+ case BTF_KIND_FWD: {
+ const char *fwd_kind = BTF_INFO_KIND(t->info) ? "union"
+ : "struct";
+
+ if (json_output)
+ jsonw_string_field(w, "fwd_kind", fwd_kind);
+ else
+ printf(" fwd_kind=%s", fwd_kind);
+ break;
+ }
+ case BTF_KIND_FUNC:
+ if (json_output)
+ jsonw_uint_field(w, "type_id", t->type);
+ else
+ printf(" type_id=%u", t->type);
+ break;
+ case BTF_KIND_FUNC_PROTO: {
+ const struct btf_param *p = (const void *)(t + 1);
+ __u16 vlen = BTF_INFO_VLEN(t->info);
+ int i;
+
+ if (json_output) {
+ jsonw_uint_field(w, "ret_type_id", t->type);
+ jsonw_uint_field(w, "vlen", vlen);
+ jsonw_name(w, "params");
+ jsonw_start_array(w);
+ } else {
+ printf(" ret_type_id=%u vlen=%u", t->type, vlen);
+ }
+ for (i = 0; i < vlen; i++, p++) {
+ const char *name = btf_str(btf, p->name_off);
+
+ if (json_output) {
+ jsonw_start_object(w);
+ jsonw_string_field(w, "name", name);
+ jsonw_uint_field(w, "type_id", p->type);
+ jsonw_end_object(w);
+ } else {
+ printf("\n\t'%s' type_id=%u", name, p->type);
+ }
+ }
+ if (json_output)
+ jsonw_end_array(w);
+ break;
+ }
+ case BTF_KIND_VAR: {
+ const struct btf_var *v = (const void *)(t + 1);
+ const char *linkage;
+
+ linkage = btf_var_linkage_str(v->linkage);
+
+ if (json_output) {
+ jsonw_uint_field(w, "type_id", t->type);
+ jsonw_string_field(w, "linkage", linkage);
+ } else {
+ printf(" type_id=%u, linkage=%s", t->type, linkage);
+ }
+ break;
+ }
+ case BTF_KIND_DATASEC: {
+ const struct btf_var_secinfo *v = (const void *)(t+1);
+ __u16 vlen = BTF_INFO_VLEN(t->info);
+ int i;
+
+ if (json_output) {
+ jsonw_uint_field(w, "size", t->size);
+ jsonw_uint_field(w, "vlen", vlen);
+ jsonw_name(w, "vars");
+ jsonw_start_array(w);
+ } else {
+ printf(" size=%u vlen=%u", t->size, vlen);
+ }
+ for (i = 0; i < vlen; i++, v++) {
+ if (json_output) {
+ jsonw_start_object(w);
+ jsonw_uint_field(w, "type_id", v->type);
+ jsonw_uint_field(w, "offset", v->offset);
+ jsonw_uint_field(w, "size", v->size);
+ jsonw_end_object(w);
+ } else {
+ printf("\n\ttype_id=%u offset=%u size=%u",
+ v->type, v->offset, v->size);
+ }
+ }
+ if (json_output)
+ jsonw_end_array(w);
+ break;
+ }
+ default:
+ break;
+ }
+
+ if (json_output)
+ jsonw_end_object(json_wtr);
+ else
+ printf("\n");
+
+ return 0;
+}
+
+static int dump_btf_raw(const struct btf *btf,
+ __u32 *root_type_ids, int root_type_cnt)
+{
+ const struct btf_type *t;
+ int i;
+
+ if (json_output) {
+ jsonw_start_object(json_wtr);
+ jsonw_name(json_wtr, "types");
+ jsonw_start_array(json_wtr);
+ }
+
+ if (root_type_cnt) {
+ for (i = 0; i < root_type_cnt; i++) {
+ t = btf__type_by_id(btf, root_type_ids[i]);
+ dump_btf_type(btf, root_type_ids[i], t);
+ }
+ } else {
+ int cnt = btf__get_nr_types(btf);
+
+ for (i = 1; i <= cnt; i++) {
+ t = btf__type_by_id(btf, i);
+ dump_btf_type(btf, i, t);
+ }
+ }
+
+ if (json_output) {
+ jsonw_end_array(json_wtr);
+ jsonw_end_object(json_wtr);
+ }
+ return 0;
+}
+
+static bool check_btf_endianness(GElf_Ehdr *ehdr)
+{
+ static unsigned int const endian = 1;
+
+ switch (ehdr->e_ident[EI_DATA]) {
+ case ELFDATA2LSB:
+ return *(unsigned char const *)&endian == 1;
+ case ELFDATA2MSB:
+ return *(unsigned char const *)&endian == 0;
+ default:
+ return 0;
+ }
+}
+
+static int btf_load_from_elf(const char *path, struct btf **btf)
+{
+ int err = -1, fd = -1, idx = 0;
+ Elf_Data *btf_data = NULL;
+ Elf_Scn *scn = NULL;
+ Elf *elf = NULL;
+ GElf_Ehdr ehdr;
+
+ if (elf_version(EV_CURRENT) == EV_NONE) {
+ p_err("failed to init libelf for %s", path);
+ return -1;
+ }
+
+ fd = open(path, O_RDONLY);
+ if (fd < 0) {
+ p_err("failed to open %s: %s", path, strerror(errno));
+ return -1;
+ }
+
+ elf = elf_begin(fd, ELF_C_READ, NULL);
+ if (!elf) {
+ p_err("failed to open %s as ELF file", path);
+ goto done;
+ }
+ if (!gelf_getehdr(elf, &ehdr)) {
+ p_err("failed to get EHDR from %s", path);
+ goto done;
+ }
+ if (!check_btf_endianness(&ehdr)) {
+ p_err("non-native ELF endianness is not supported");
+ goto done;
+ }
+ if (!elf_rawdata(elf_getscn(elf, ehdr.e_shstrndx), NULL)) {
+ p_err("failed to get e_shstrndx from %s\n", path);
+ goto done;
+ }
+
+ while ((scn = elf_nextscn(elf, scn)) != NULL) {
+ GElf_Shdr sh;
+ char *name;
+
+ idx++;
+ if (gelf_getshdr(scn, &sh) != &sh) {
+ p_err("failed to get section(%d) header from %s",
+ idx, path);
+ goto done;
+ }
+ name = elf_strptr(elf, ehdr.e_shstrndx, sh.sh_name);
+ if (!name) {
+ p_err("failed to get section(%d) name from %s",
+ idx, path);
+ goto done;
+ }
+ if (strcmp(name, BTF_ELF_SEC) == 0) {
+ btf_data = elf_getdata(scn, 0);
+ if (!btf_data) {
+ p_err("failed to get section(%d, %s) data from %s",
+ idx, name, path);
+ goto done;
+ }
+ break;
+ }
+ }
+
+ if (!btf_data) {
+ p_err("%s ELF section not found in %s", BTF_ELF_SEC, path);
+ goto done;
+ }
+
+ *btf = btf__new(btf_data->d_buf, btf_data->d_size);
+ if (IS_ERR(*btf)) {
+ err = PTR_ERR(*btf);
+ *btf = NULL;
+ p_err("failed to load BTF data from %s: %s",
+ path, strerror(err));
+ goto done;
+ }
+
+ err = 0;
+done:
+ if (err) {
+ if (*btf) {
+ btf__free(*btf);
+ *btf = NULL;
+ }
+ }
+ if (elf)
+ elf_end(elf);
+ close(fd);
+ return err;
+}
+
+static int do_dump(int argc, char **argv)
+{
+ struct btf *btf = NULL;
+ __u32 root_type_ids[2];
+ int root_type_cnt = 0;
+ __u32 btf_id = -1;
+ const char *src;
+ int fd = -1;
+ int err;
+
+ if (!REQ_ARGS(2)) {
+ usage();
+ return -1;
+ }
+ src = GET_ARG();
+
+ if (is_prefix(src, "map")) {
+ struct bpf_map_info info = {};
+ __u32 len = sizeof(info);
+
+ if (!REQ_ARGS(2)) {
+ usage();
+ return -1;
+ }
+
+ fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
+ if (fd < 0)
+ return -1;
+
+ btf_id = info.btf_id;
+ if (argc && is_prefix(*argv, "key")) {
+ root_type_ids[root_type_cnt++] = info.btf_key_type_id;
+ NEXT_ARG();
+ } else if (argc && is_prefix(*argv, "value")) {
+ root_type_ids[root_type_cnt++] = info.btf_value_type_id;
+ NEXT_ARG();
+ } else if (argc && is_prefix(*argv, "all")) {
+ NEXT_ARG();
+ } else if (argc && is_prefix(*argv, "kv")) {
+ root_type_ids[root_type_cnt++] = info.btf_key_type_id;
+ root_type_ids[root_type_cnt++] = info.btf_value_type_id;
+ NEXT_ARG();
+ } else {
+ root_type_ids[root_type_cnt++] = info.btf_key_type_id;
+ root_type_ids[root_type_cnt++] = info.btf_value_type_id;
+ }
+ } else if (is_prefix(src, "prog")) {
+ struct bpf_prog_info info = {};
+ __u32 len = sizeof(info);
+
+ if (!REQ_ARGS(2)) {
+ usage();
+ return -1;
+ }
+
+ fd = prog_parse_fd(&argc, &argv);
+ if (fd < 0)
+ return -1;
+
+ err = bpf_obj_get_info_by_fd(fd, &info, &len);
+ if (err) {
+ p_err("can't get prog info: %s", strerror(errno));
+ goto done;
+ }
+
+ btf_id = info.btf_id;
+ } else if (is_prefix(src, "id")) {
+ char *endptr;
+
+ btf_id = strtoul(*argv, &endptr, 0);
+ if (*endptr) {
+ p_err("can't parse %s as ID", **argv);
+ return -1;
+ }
+ NEXT_ARG();
+ } else if (is_prefix(src, "file")) {
+ err = btf_load_from_elf(*argv, &btf);
+ if (err)
+ goto done;
+ NEXT_ARG();
+ } else {
+ err = -1;
+ p_err("unrecognized BTF source specifier: '%s'", src);
+ goto done;
+ }
+
+ if (!btf) {
+ err = btf__get_from_id(btf_id, &btf);
+ if (err) {
+ p_err("get btf by id (%u): %s", btf_id, strerror(err));
+ goto done;
+ }
+ if (!btf) {
+ err = ENOENT;
+ p_err("can't find btf with ID (%u)", btf_id);
+ goto done;
+ }
+ }
+
+ dump_btf_raw(btf, root_type_ids, root_type_cnt);
+
+done:
+ close(fd);
+ btf__free(btf);
+ return err;
+}
+
+static int do_help(int argc, char **argv)
+{
+ if (json_output) {
+ jsonw_null(json_wtr);
+ return 0;
+ }
+
+ fprintf(stderr,
+ "Usage: %s btf dump BTF_SRC\n"
+ " %s btf help\n"
+ "\n"
+ " BTF_SRC := { id BTF_ID | prog PROG | map MAP [{key | value | kv | all}] | file FILE }\n"
+ " " HELP_SPEC_MAP "\n"
+ " " HELP_SPEC_PROGRAM "\n"
+ " " HELP_SPEC_OPTIONS "\n"
+ "",
+ bin_name, bin_name);
+
+ return 0;
+}
+
+static const struct cmd cmds[] = {
+ { "help", do_help },
+ { "dump", do_dump },
+ { 0 }
+};
+
+int do_btf(int argc, char **argv)
+{
+ return cmd_select(cmds, argc, argv, do_help);
+}
diff --git a/tools/bpf/bpftool/main.c b/tools/bpf/bpftool/main.c
index a9d5e9e6a732..1ac1fc520e6a 100644
--- a/tools/bpf/bpftool/main.c
+++ b/tools/bpf/bpftool/main.c
@@ -56,7 +56,7 @@ static int do_help(int argc, char **argv)
" %s batch file FILE\n"
" %s version\n"
"\n"
- " OBJECT := { prog | map | cgroup | perf | net | feature }\n"
+ " OBJECT := { prog | map | cgroup | perf | net | feature | btf }\n"
" " HELP_SPEC_OPTIONS "\n"
"",
bin_name, bin_name, bin_name);
@@ -188,6 +188,7 @@ static const struct cmd cmds[] = {
{ "perf", do_perf },
{ "net", do_net },
{ "feature", do_feature },
+ { "btf", do_btf },
{ "version", do_version },
{ 0 }
};
diff --git a/tools/bpf/bpftool/main.h b/tools/bpf/bpftool/main.h
index 1ccc46169a19..3d63feb7f852 100644
--- a/tools/bpf/bpftool/main.h
+++ b/tools/bpf/bpftool/main.h
@@ -150,6 +150,7 @@ int do_perf(int argc, char **arg);
int do_net(int argc, char **arg);
int do_tracelog(int argc, char **arg);
int do_feature(int argc, char **argv);
+int do_btf(int argc, char **argv);
int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what);
int prog_parse_fd(int *argc, char ***argv);
--
2.17.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v4 bpf-next 2/4] bpftool/docs: add btf sub-command documentation
2019-04-25 22:30 [PATCH v4 bpf-next 0/4] add btf dumping to bpftool Andrii Nakryiko
2019-04-25 22:30 ` [PATCH v4 bpf-next 1/4] bpftool: add ability to dump BTF types Andrii Nakryiko
@ 2019-04-25 22:30 ` Andrii Nakryiko
2019-04-25 22:30 ` [PATCH v4 bpf-next 3/4] bpftool: add bash completions for btf command Andrii Nakryiko
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Andrii Nakryiko @ 2019-04-25 22:30 UTC (permalink / raw)
To: andrii.nakryiko, netdev, bpf
Document usage and sample output format for `btf dump` sub-command.
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Yonghong Song <yhs@fb.com>
Cc: Martin KaFai Lau <kafai@fb.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
---
.../bpf/bpftool/Documentation/bpftool-btf.rst | 222 ++++++++++++++++++
.../bpftool/Documentation/bpftool-cgroup.rst | 3 +-
.../bpftool/Documentation/bpftool-feature.rst | 3 +-
.../bpf/bpftool/Documentation/bpftool-map.rst | 3 +-
.../bpf/bpftool/Documentation/bpftool-net.rst | 3 +-
.../bpftool/Documentation/bpftool-perf.rst | 3 +-
.../bpftool/Documentation/bpftool-prog.rst | 3 +-
tools/bpf/bpftool/Documentation/bpftool.rst | 3 +-
8 files changed, 236 insertions(+), 7 deletions(-)
create mode 100644 tools/bpf/bpftool/Documentation/bpftool-btf.rst
diff --git a/tools/bpf/bpftool/Documentation/bpftool-btf.rst b/tools/bpf/bpftool/Documentation/bpftool-btf.rst
new file mode 100644
index 000000000000..2dbc1413fabd
--- /dev/null
+++ b/tools/bpf/bpftool/Documentation/bpftool-btf.rst
@@ -0,0 +1,222 @@
+================
+bpftool-btf
+================
+-------------------------------------------------------------------------------
+tool for inspection of BTF data
+-------------------------------------------------------------------------------
+
+:Manual section: 8
+
+SYNOPSIS
+========
+
+ **bpftool** [*OPTIONS*] **btf** *COMMAND*
+
+ *OPTIONS* := { { **-j** | **--json** } [{ **-p** | **--pretty** }] }
+
+ *COMMANDS* := { **dump** | **help** }
+
+BTF COMMANDS
+=============
+
+| **bpftool** **btf dump** *BTF_SRC*
+| **bpftool** **btf help**
+|
+| *BTF_SRC* := { **id** *BTF_ID* | **prog** *PROG* | **map** *MAP* [{**key** | **value** | **kv** | **all**}] | **file** *FILE* }
+| *MAP* := { **id** *MAP_ID* | **pinned** *FILE* }
+| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* }
+
+DESCRIPTION
+===========
+ **bpftool btf dump** *BTF_SRC*
+ Dump BTF entries from a given *BTF_SRC*.
+
+ When **id** is specified, BTF object with that ID will be
+ loaded and all its BTF types emitted.
+
+ When **map** is provided, it's expected that map has
+ associated BTF object with BTF types describing key and
+ value. It's possible to select whether to dump only BTF
+ type(s) associated with key (**key**), value (**value**),
+ both key and value (**kv**), or all BTF types present in
+ associated BTF object (**all**). If not specified, **kv**
+ is assumed.
+
+ When **prog** is provided, it's expected that program has
+ associated BTF object with BTF types.
+
+ When specifying *FILE*, an ELF file is expected, containing
+ .BTF section with well-defined BTF binary format data,
+ typically produced by clang or pahole.
+
+ **bpftool btf help**
+ Print short help message.
+
+OPTIONS
+=======
+ -h, --help
+ Print short generic help message (similar to **bpftool help**).
+
+ -V, --version
+ Print version number (similar to **bpftool version**).
+
+ -j, --json
+ Generate JSON output. For commands that cannot produce JSON, this
+ option has no effect.
+
+ -p, --pretty
+ Generate human-readable JSON output. Implies **-j**.
+
+EXAMPLES
+========
+**# bpftool btf dump id 1226**
+::
+
+ [1] PTR '(anon)' type_id=2
+ [2] STRUCT 'dummy_tracepoint_args' size=16 vlen=2
+ 'pad' type_id=3 bits_offset=0
+ 'sock' type_id=4 bits_offset=64
+ [3] INT 'long long unsigned int' size=8 bits_offset=0 nr_bits=64 encoding=(none)
+ [4] PTR '(anon)' type_id=5
+ [5] FWD 'sock' fwd_kind=union
+
+This gives an example of default output for all supported BTF kinds.
+
+**$ cat prog.c**
+::
+
+ struct fwd_struct;
+
+ enum my_enum {
+ VAL1 = 3,
+ VAL2 = 7,
+ };
+
+ typedef struct my_struct my_struct_t;
+
+ struct my_struct {
+ const unsigned int const_int_field;
+ int bitfield_field: 4;
+ char arr_field[16];
+ const struct fwd_struct *restrict fwd_field;
+ enum my_enum enum_field;
+ volatile my_struct_t *typedef_ptr_field;
+ };
+
+ union my_union {
+ int a;
+ struct my_struct b;
+ };
+
+ struct my_struct struct_global_var __attribute__((section("data_sec"))) = {
+ .bitfield_field = 3,
+ .enum_field = VAL1,
+ };
+ int global_var __attribute__((section("data_sec"))) = 7;
+
+ __attribute__((noinline))
+ int my_func(union my_union *arg1, int arg2)
+ {
+ static int static_var __attribute__((section("data_sec"))) = 123;
+ static_var++;
+ return static_var;
+ }
+
+**$ bpftool btf dump file prog.o**
+::
+
+ [1] PTR '(anon)' type_id=2
+ [2] UNION 'my_union' size=48 vlen=2
+ 'a' type_id=3 bits_offset=0
+ 'b' type_id=4 bits_offset=0
+ [3] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED
+ [4] STRUCT 'my_struct' size=48 vlen=6
+ 'const_int_field' type_id=5 bits_offset=0
+ 'bitfield_field' type_id=3 bits_offset=32 bitfield_size=4
+ 'arr_field' type_id=8 bits_offset=40
+ 'fwd_field' type_id=10 bits_offset=192
+ 'enum_field' type_id=14 bits_offset=256
+ 'typedef_ptr_field' type_id=15 bits_offset=320
+ [5] CONST '(anon)' type_id=6
+ [6] INT 'unsigned int' size=4 bits_offset=0 nr_bits=32 encoding=(none)
+ [7] INT 'char' size=1 bits_offset=0 nr_bits=8 encoding=SIGNED
+ [8] ARRAY '(anon)' type_id=7 index_type_id=9 nr_elems=16
+ [9] INT '__ARRAY_SIZE_TYPE__' size=4 bits_offset=0 nr_bits=32 encoding=(none)
+ [10] RESTRICT '(anon)' type_id=11
+ [11] PTR '(anon)' type_id=12
+ [12] CONST '(anon)' type_id=13
+ [13] FWD 'fwd_struct' fwd_kind=union
+ [14] ENUM 'my_enum' size=4 vlen=2
+ 'VAL1' val=3
+ 'VAL2' val=7
+ [15] PTR '(anon)' type_id=16
+ [16] VOLATILE '(anon)' type_id=17
+ [17] TYPEDEF 'my_struct_t' type_id=4
+ [18] FUNC_PROTO '(anon)' ret_type_id=3 vlen=2
+ 'arg1' type_id=1
+ 'arg2' type_id=3
+ [19] FUNC 'my_func' type_id=18
+ [20] VAR 'struct_global_var' type_id=4, linkage=global-alloc
+ [21] VAR 'global_var' type_id=3, linkage=global-alloc
+ [22] VAR 'my_func.static_var' type_id=3, linkage=static
+ [23] DATASEC 'data_sec' size=0 vlen=3
+ type_id=20 offset=0 size=48
+ type_id=21 offset=0 size=4
+ type_id=22 offset=52 size=4
+
+The following commands print BTF types associated with specified map's key,
+value, both key and value, and all BTF types, respectively. By default, both
+key and value types will be printed.
+
+**# bpftool btf dump map id 123 key**
+
+::
+
+ [39] TYPEDEF 'u32' type_id=37
+
+**# bpftool btf dump map id 123 value**
+
+::
+
+ [86] PTR '(anon)' type_id=87
+
+**# bpftool btf dump map id 123 kv**
+
+::
+
+ [39] TYPEDEF 'u32' type_id=37
+ [86] PTR '(anon)' type_id=87
+
+**# bpftool btf dump map id 123 all**
+
+::
+
+ [1] PTR '(anon)' type_id=0
+ .
+ .
+ .
+ [2866] ARRAY '(anon)' type_id=52 index_type_id=51 nr_elems=4
+
+All the standard ways to specify map or program are supported:
+
+**# bpftool btf dump map id 123**
+
+**# bpftool btf dump map pinned /sys/fs/bpf/map_name**
+
+**# bpftool btf dump prog id 456**
+
+**# bpftool btf dump prog tag b88e0a09b1d9759d**
+
+**# bpftool btf dump prog pinned /sys/fs/bpf/prog_name**
+
+SEE ALSO
+========
+ **bpf**\ (2),
+ **bpf-helpers**\ (7),
+ **bpftool**\ (8),
+ **bpftool-map**\ (8),
+ **bpftool-prog**\ (8),
+ **bpftool-cgroup**\ (8),
+ **bpftool-feature**\ (8),
+ **bpftool-net**\ (8),
+ **bpftool-perf**\ (8)
diff --git a/tools/bpf/bpftool/Documentation/bpftool-cgroup.rst b/tools/bpf/bpftool/Documentation/bpftool-cgroup.rst
index 89b6b10e2183..ac26876389c2 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-cgroup.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-cgroup.rst
@@ -145,4 +145,5 @@ SEE ALSO
**bpftool-map**\ (8),
**bpftool-feature**\ (8),
**bpftool-net**\ (8),
- **bpftool-perf**\ (8)
+ **bpftool-perf**\ (8),
+ **bpftool-btf**\ (8)
diff --git a/tools/bpf/bpftool/Documentation/bpftool-feature.rst b/tools/bpf/bpftool/Documentation/bpftool-feature.rst
index 10177343b7ce..14180e887082 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-feature.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-feature.rst
@@ -82,4 +82,5 @@ SEE ALSO
**bpftool-map**\ (8),
**bpftool-cgroup**\ (8),
**bpftool-net**\ (8),
- **bpftool-perf**\ (8)
+ **bpftool-perf**\ (8),
+ **bpftool-btf**\ (8)
diff --git a/tools/bpf/bpftool/Documentation/bpftool-map.rst b/tools/bpf/bpftool/Documentation/bpftool-map.rst
index 55ecf80ca03e..13ef27b39f20 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-map.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-map.rst
@@ -258,4 +258,5 @@ SEE ALSO
**bpftool-cgroup**\ (8),
**bpftool-feature**\ (8),
**bpftool-net**\ (8),
- **bpftool-perf**\ (8)
+ **bpftool-perf**\ (8),
+ **bpftool-btf**\ (8)
diff --git a/tools/bpf/bpftool/Documentation/bpftool-net.rst b/tools/bpf/bpftool/Documentation/bpftool-net.rst
index 6b692b428373..934580850f42 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-net.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-net.rst
@@ -143,4 +143,5 @@ SEE ALSO
**bpftool-map**\ (8),
**bpftool-cgroup**\ (8),
**bpftool-feature**\ (8),
- **bpftool-perf**\ (8)
+ **bpftool-perf**\ (8),
+ **bpftool-btf**\ (8)
diff --git a/tools/bpf/bpftool/Documentation/bpftool-perf.rst b/tools/bpf/bpftool/Documentation/bpftool-perf.rst
index 86154740fabb..0c7576523a21 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-perf.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-perf.rst
@@ -85,4 +85,5 @@ SEE ALSO
**bpftool-map**\ (8),
**bpftool-cgroup**\ (8),
**bpftool-feature**\ (8),
- **bpftool-net**\ (8)
+ **bpftool-net**\ (8),
+ **bpftool-btf**\ (8)
diff --git a/tools/bpf/bpftool/Documentation/bpftool-prog.rst b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
index 2f183ffd8351..e8118544d118 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-prog.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
@@ -271,4 +271,5 @@ SEE ALSO
**bpftool-cgroup**\ (8),
**bpftool-feature**\ (8),
**bpftool-net**\ (8),
- **bpftool-perf**\ (8)
+ **bpftool-perf**\ (8),
+ **bpftool-btf**\ (8)
diff --git a/tools/bpf/bpftool/Documentation/bpftool.rst b/tools/bpf/bpftool/Documentation/bpftool.rst
index deb2ca911ddf..3e562d7fd56f 100644
--- a/tools/bpf/bpftool/Documentation/bpftool.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool.rst
@@ -76,4 +76,5 @@ SEE ALSO
**bpftool-cgroup**\ (8),
**bpftool-feature**\ (8),
**bpftool-net**\ (8),
- **bpftool-perf**\ (8)
+ **bpftool-perf**\ (8),
+ **bpftool-btf**\ (8)
--
2.17.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v4 bpf-next 3/4] bpftool: add bash completions for btf command
2019-04-25 22:30 [PATCH v4 bpf-next 0/4] add btf dumping to bpftool Andrii Nakryiko
2019-04-25 22:30 ` [PATCH v4 bpf-next 1/4] bpftool: add ability to dump BTF types Andrii Nakryiko
2019-04-25 22:30 ` [PATCH v4 bpf-next 2/4] bpftool/docs: add btf sub-command documentation Andrii Nakryiko
@ 2019-04-25 22:30 ` Andrii Nakryiko
2019-04-25 22:30 ` [PATCH v4 bpf-next 4/4] bpftool: fix indendation in bash-completion/bpftool Andrii Nakryiko
2019-04-26 4:48 ` [PATCH v4 bpf-next 0/4] add btf dumping to bpftool Alexei Starovoitov
4 siblings, 0 replies; 6+ messages in thread
From: Andrii Nakryiko @ 2019-04-25 22:30 UTC (permalink / raw)
To: andrii.nakryiko, netdev, bpf
Add full support for btf command in bash-completion script.
Cc: Quentin Monnet <quentin.monnet@netronome.com>
Cc: Yonghong Song <yhs@fb.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
---
tools/bpf/bpftool/bash-completion/bpftool | 46 +++++++++++++++++++++++
1 file changed, 46 insertions(+)
diff --git a/tools/bpf/bpftool/bash-completion/bpftool b/tools/bpf/bpftool/bash-completion/bpftool
index 9f3ffe1e26ab..bca91d04ed35 100644
--- a/tools/bpf/bpftool/bash-completion/bpftool
+++ b/tools/bpf/bpftool/bash-completion/bpftool
@@ -217,6 +217,7 @@ _bpftool()
done
cur=${words[cword]}
prev=${words[cword - 1]}
+ pprev=${words[cword - 2]}
local object=${words[1]} command=${words[2]}
@@ -607,6 +608,51 @@ _bpftool()
;;
esac
;;
+ btf)
+ local PROG_TYPE='id pinned tag'
+ local MAP_TYPE='id pinned'
+ case $command in
+ dump)
+ case $prev in
+ $command)
+ COMPREPLY+=( $( compgen -W "id map prog file" -- \
+ "$cur" ) )
+ return 0
+ ;;
+ prog)
+ COMPREPLY=( $( compgen -W "$PROG_TYPE" -- "$cur" ) )
+ return 0
+ ;;
+ map)
+ COMPREPLY=( $( compgen -W "$MAP_TYPE" -- "$cur" ) )
+ return 0
+ ;;
+ id)
+ case $pprev in
+ prog)
+ _bpftool_get_prog_ids
+ ;;
+ map)
+ _bpftool_get_map_ids
+ ;;
+ esac
+ return 0
+ ;;
+ *)
+ if [[ $cword == 6 ]] && [[ ${words[3]} == "map" ]]; then
+ COMPREPLY+=( $( compgen -W 'key value kv all' -- \
+ "$cur" ) )
+ fi
+ return 0
+ ;;
+ esac
+ ;;
+ *)
+ [[ $prev == $object ]] && \
+ COMPREPLY=( $( compgen -W 'dump help' -- "$cur" ) )
+ ;;
+ esac
+ ;;
cgroup)
case $command in
show|list)
--
2.17.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v4 bpf-next 4/4] bpftool: fix indendation in bash-completion/bpftool
2019-04-25 22:30 [PATCH v4 bpf-next 0/4] add btf dumping to bpftool Andrii Nakryiko
` (2 preceding siblings ...)
2019-04-25 22:30 ` [PATCH v4 bpf-next 3/4] bpftool: add bash completions for btf command Andrii Nakryiko
@ 2019-04-25 22:30 ` Andrii Nakryiko
2019-04-26 4:48 ` [PATCH v4 bpf-next 0/4] add btf dumping to bpftool Alexei Starovoitov
4 siblings, 0 replies; 6+ messages in thread
From: Andrii Nakryiko @ 2019-04-25 22:30 UTC (permalink / raw)
To: andrii.nakryiko, netdev, bpf
Fix misaligned default case branch for `prog dump` sub-command.
Reported-by: Quentin Monnet <quentin.monnet@netronome.com>
Cc: Yonghong Song <yhs@fb.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
---
tools/bpf/bpftool/bash-completion/bpftool | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
diff --git a/tools/bpf/bpftool/bash-completion/bpftool b/tools/bpf/bpftool/bash-completion/bpftool
index bca91d04ed35..50e402a5a9c8 100644
--- a/tools/bpf/bpftool/bash-completion/bpftool
+++ b/tools/bpf/bpftool/bash-completion/bpftool
@@ -273,17 +273,17 @@ _bpftool()
"$cur" ) )
return 0
;;
- *)
- _bpftool_once_attr 'file'
- if _bpftool_search_list 'xlated'; then
- COMPREPLY+=( $( compgen -W 'opcodes visual linum' -- \
- "$cur" ) )
- else
- COMPREPLY+=( $( compgen -W 'opcodes linum' -- \
- "$cur" ) )
- fi
- return 0
- ;;
+ *)
+ _bpftool_once_attr 'file'
+ if _bpftool_search_list 'xlated'; then
+ COMPREPLY+=( $( compgen -W 'opcodes visual linum' -- \
+ "$cur" ) )
+ else
+ COMPREPLY+=( $( compgen -W 'opcodes linum' -- \
+ "$cur" ) )
+ fi
+ return 0
+ ;;
esac
;;
pin)
--
2.17.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v4 bpf-next 0/4] add btf dumping to bpftool
2019-04-25 22:30 [PATCH v4 bpf-next 0/4] add btf dumping to bpftool Andrii Nakryiko
` (3 preceding siblings ...)
2019-04-25 22:30 ` [PATCH v4 bpf-next 4/4] bpftool: fix indendation in bash-completion/bpftool Andrii Nakryiko
@ 2019-04-26 4:48 ` Alexei Starovoitov
4 siblings, 0 replies; 6+ messages in thread
From: Alexei Starovoitov @ 2019-04-26 4:48 UTC (permalink / raw)
To: Andrii Nakryiko; +Cc: Andrii Nakryiko, Network Development, bpf
On Thu, Apr 25, 2019 at 4:08 PM Andrii Nakryiko <andriin@fb.com> wrote:
>
> This patch set adds a new `bpftool btf dump` sub-command, which allows to dump
> BTF contents (only types for now). Currently it only outputs low-level
> content, almost 1:1 with binary BTF format, but follow up patches will add
> ability to dump BTF types as a compilable C header file. JSON output is
> supported as well.
>
> Patch #1 adds `btf` sub-command, dumping BTF types in human-readable format.
> It also implements reading .BTF data from ELF file.
> Patch #2 adds minimal documentation with output format examples and different
> ways to specify source of BTF data.
> Patch #3 adds support for btf command in bash-completion/bpftool script.
> Patch #4 fixes minor indentation issue in bash-completion script.
>
> Output format is mostly following existing format of BPF verifier log, but
> deviates from it in few places. More details are in commit message for patch
> #1.
>
> Example of output for all supported BTF kinds are in patch #2 as part of
> documentation. Some field names are quite verbose and I'd rather shorten them,
> if we don't feel like being very close to BPF verifier names is a necessity,
> but in this patch I left them exactly the same as in verifier log.
>
> v3->v4:
> - reverse Christmas tree (Quentin)
> - better docs (Quentin)
>
> v2->v3:
> - make map's key|value|kv|all suggestion more precise (Quentin)
> - fix default case indentations (Quentin)
>
> v1->v2:
> - fix unnecessary trailing whitespaces in bpftool-btf.rst (Yonghong)
> - add btf in main.c for a list of possible OBJECTs
> - handle unknown keyword under `bpftool btf dump` (Yonghong)
Applied. Thanks!
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2019-04-26 4:48 UTC | newest]
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2019-04-25 22:30 [PATCH v4 bpf-next 0/4] add btf dumping to bpftool Andrii Nakryiko
2019-04-25 22:30 ` [PATCH v4 bpf-next 1/4] bpftool: add ability to dump BTF types Andrii Nakryiko
2019-04-25 22:30 ` [PATCH v4 bpf-next 2/4] bpftool/docs: add btf sub-command documentation Andrii Nakryiko
2019-04-25 22:30 ` [PATCH v4 bpf-next 3/4] bpftool: add bash completions for btf command Andrii Nakryiko
2019-04-25 22:30 ` [PATCH v4 bpf-next 4/4] bpftool: fix indendation in bash-completion/bpftool Andrii Nakryiko
2019-04-26 4:48 ` [PATCH v4 bpf-next 0/4] add btf dumping to bpftool Alexei Starovoitov
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