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Date: Mon, 23 Jul 2018 11:41:44 -0700
From: Martin KaFai Lau <kafai@...com>
To: Yonghong Song <yhs@...com>
CC: <netdev@...r.kernel.org>, Alexei Starovoitov <ast@...com>,
Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>
Subject: Re: [PATCH v2 bpf 2/3] bpf: Replace [u]int32_t and [u]int64_t in
libbpf
On Mon, Jul 23, 2018 at 11:04:34AM -0700, Yonghong Song wrote:
>
>
> On 7/21/18 11:20 AM, Martin KaFai Lau wrote:
> > This patch replaces [u]int32_t and [u]int64_t usage with
> > __[su]32 and __[su]64. The same change goes for [u]int16_t
> > and [u]int8_t.
> >
> > Fixes: 8a138aed4a80 ("bpf: btf: Add BTF support to libbpf")
> > Signed-off-by: Martin KaFai Lau <kafai@...com>
> > ---
> > tools/lib/bpf/btf.c | 28 +++++++++++++---------------
> > tools/lib/bpf/btf.h | 8 ++++----
> > tools/lib/bpf/libbpf.c | 12 ++++++------
> > tools/lib/bpf/libbpf.h | 4 ++--
> > 4 files changed, 25 insertions(+), 27 deletions(-)
> >
> > diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
> > index 8c54a4b6f187..ce77b5b57912 100644
> > --- a/tools/lib/bpf/btf.c
> > +++ b/tools/lib/bpf/btf.c
> > @@ -2,7 +2,6 @@
> > /* Copyright (c) 2018 Facebook */
> > #include <stdlib.h>
> > -#include <stdint.h>
> > #include <string.h>
> > #include <unistd.h>
> > #include <errno.h>
> > @@ -27,13 +26,13 @@ struct btf {
> > struct btf_type **types;
> > const char *strings;
> > void *nohdr_data;
> > - uint32_t nr_types;
> > - uint32_t types_size;
> > - uint32_t data_size;
> > + __u32 nr_types;
> > + __u32 types_size;
> > + __u32 data_size;
> > int fd;
> > };
> > -static const char *btf_name_by_offset(const struct btf *btf, uint32_t offset)
> > +static const char *btf_name_by_offset(const struct btf *btf, __u32 offset)
> > {
> > if (offset < btf->hdr->str_len)
> > return &btf->strings[offset];
> > @@ -151,7 +150,7 @@ static int btf_parse_type_sec(struct btf *btf, btf_print_fn_t err_log)
> > while (next_type < end_type) {
> > struct btf_type *t = next_type;
> > - uint16_t vlen = BTF_INFO_VLEN(t->info);
> > + __u16 vlen = BTF_INFO_VLEN(t->info);
> > int err;
> > next_type += sizeof(*t);
> > @@ -191,7 +190,7 @@ static int btf_parse_type_sec(struct btf *btf, btf_print_fn_t err_log)
> > }
> > static const struct btf_type *btf_type_by_id(const struct btf *btf,
> > - uint32_t type_id)
> > + __u32 type_id)
> > {
> > if (type_id > btf->nr_types)
> > return NULL;
> > @@ -226,12 +225,12 @@ static int64_t btf_type_size(const struct btf_type *t)
>
> Missing this one:
> static int64_t btf_type_size(const struct btf_type *t)
>
> There are a couple of instances of using u32 instead of __u32, better to use
> __u32 everywhere in the same file:
> u32 expand_by, new_size;
> u32 meta_left;
Thanks for pointing them out. Will make the changes.
>
>
> > #define MAX_RESOLVE_DEPTH 32
> > -int64_t btf__resolve_size(const struct btf *btf, uint32_t type_id)
> > +__s64 btf__resolve_size(const struct btf *btf, __u32 type_id)
> > {
> > const struct btf_array *array;
> > const struct btf_type *t;
> > - uint32_t nelems = 1;
> > - int64_t size = -1;
> > + __u32 nelems = 1;
> > + __s64 size = -1;
> > int i;
> > t = btf_type_by_id(btf, type_id);
> > @@ -271,9 +270,9 @@ int64_t btf__resolve_size(const struct btf *btf, uint32_t type_id)
> > return nelems * size;
> > }
> > -int32_t btf__find_by_name(const struct btf *btf, const char *type_name)
> > +__s32 btf__find_by_name(const struct btf *btf, const char *type_name)
> > {
> > - uint32_t i;
> > + __u32 i;
> > if (!strcmp(type_name, "void"))
> > return 0;
> > @@ -302,10 +301,9 @@ void btf__free(struct btf *btf)
> > free(btf);
> > }
> > -struct btf *btf__new(uint8_t *data, uint32_t size,
> > - btf_print_fn_t err_log)
> > +struct btf *btf__new(__u8 *data, __u32 size, btf_print_fn_t err_log)
> > {
> > - uint32_t log_buf_size = 0;
> > + __u32 log_buf_size = 0;
> > char *log_buf = NULL;
> > struct btf *btf;
> > int err;
> > diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h
> > index 74bb344035bb..ed3a84370ccc 100644
> > --- a/tools/lib/bpf/btf.h
> > +++ b/tools/lib/bpf/btf.h
> > @@ -4,7 +4,7 @@
> > #ifndef __BPF_BTF_H
> > #define __BPF_BTF_H
> > -#include <stdint.h>
> > +#include <linux/types.h>
> > #define BTF_ELF_SEC ".BTF"
> > @@ -14,9 +14,9 @@ typedef int (*btf_print_fn_t)(const char *, ...)
> > __attribute__((format(printf, 1, 2)));
> > void btf__free(struct btf *btf);
> > -struct btf *btf__new(uint8_t *data, uint32_t size, btf_print_fn_t err_log);
> > -int32_t btf__find_by_name(const struct btf *btf, const char *type_name);
> > -int64_t btf__resolve_size(const struct btf *btf, uint32_t type_id);
> > +struct btf *btf__new(__u8 *data, __u32 size, btf_print_fn_t err_log);
> > +__s32 btf__find_by_name(const struct btf *btf, const char *type_name);
> > +__s64 btf__resolve_size(const struct btf *btf, __u32 type_id);
> > int btf__fd(const struct btf *btf);
> > #endif
> > diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> > index a1e96b5de5ff..6deb4fe4fffe 100644
> > --- a/tools/lib/bpf/libbpf.c
> > +++ b/tools/lib/bpf/libbpf.c
> > @@ -216,8 +216,8 @@ struct bpf_map {
> > size_t offset;
> > int map_ifindex;
> > struct bpf_map_def def;
> > - uint32_t btf_key_type_id;
> > - uint32_t btf_value_type_id;
> > + __u32 btf_key_type_id;
> > + __u32 btf_value_type_id;
> > void *priv;
> > bpf_map_clear_priv_t clear_priv;
> > };
> > @@ -1016,8 +1016,8 @@ static int bpf_map_find_btf_info(struct bpf_map *map, const struct btf *btf)
> > {
> > struct bpf_map_def *def = &map->def;
> > const size_t max_name = 256;
> > - int64_t key_size, value_size;
> > - int32_t key_id, value_id;
> > + __s64 key_size, value_size;
> > + __s32 key_id, value_id;
> > char name[max_name];
> > /* Find key type by name from BTF */
> > @@ -2089,12 +2089,12 @@ const char *bpf_map__name(struct bpf_map *map)
> > return map ? map->name : NULL;
> > }
> > -uint32_t bpf_map__btf_key_type_id(const struct bpf_map *map)
> > +__u32 bpf_map__btf_key_type_id(const struct bpf_map *map)
> > {
> > return map ? map->btf_key_type_id : 0;
> > }
> > -uint32_t bpf_map__btf_value_type_id(const struct bpf_map *map)
> > +__u32 bpf_map__btf_value_type_id(const struct bpf_map *map)
> > {
> > return map ? map->btf_value_type_id : 0;
> > }
> > diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
> > index 09976531aa74..b33ae02f7d0e 100644
> > --- a/tools/lib/bpf/libbpf.h
> > +++ b/tools/lib/bpf/libbpf.h
> > @@ -244,8 +244,8 @@ bpf_map__next(struct bpf_map *map, struct bpf_object *obj);
> > int bpf_map__fd(struct bpf_map *map);
> > const struct bpf_map_def *bpf_map__def(struct bpf_map *map);
> > const char *bpf_map__name(struct bpf_map *map);
> > -uint32_t bpf_map__btf_key_type_id(const struct bpf_map *map);
> > -uint32_t bpf_map__btf_value_type_id(const struct bpf_map *map);
> > +__u32 bpf_map__btf_key_type_id(const struct bpf_map *map);
> > +__u32 bpf_map__btf_value_type_id(const struct bpf_map *map);
> > typedef void (*bpf_map_clear_priv_t)(struct bpf_map *, void *);
> > int bpf_map__set_priv(struct bpf_map *map, void *priv,
> >
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