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Message-ID: <CAH+k93H5ddp7cMBGtyn9DNPvv1MymGCsShJ1-3tezLPUnxt6vw@mail.gmail.com>
Date: Wed, 26 Jun 2019 15:48:35 +0100
From: Matt Hart <matthew.hart@...aro.org>
To: Andrii Nakryiko <andriin@...com>, linux-perf-users@...r.kernel.org
Cc: andrii.nakryiko@...il.com, ast@...com, daniel@...earbox.net,
netdev@...r.kernel.org, bpf@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH v2 bpf-next 04/11] libbpf: refactor map initialization
Hi all,
I noticed perf fails to build for armv7 on linux next, due to this
compile error:
$ make -C tools/perf ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-
CC libbpf_probes.o
In file included from libbpf.c:27:
libbpf.c: In function ‘bpf_object__add_map’:
/home/matt/git/linux-next/tools/include/linux/kernel.h:45:17: error:
comparison of distinct pointer types lacks a cast [-Werror]
(void) (&_max1 == &_max2); \
^~
libbpf.c:776:12: note: in expansion of macro ‘max’
new_cap = max(4ul, obj->maps_cap * 3 / 2);
^~~
So I bisected it and came down to this patch.
Commit bf82927125dd25003d76ed5541da704df21de57a
Full verbose bisect script https://hastebin.com/odoyujofav.coffeescript
Is this a case that perf code needs updating to match the change, or
is the change broken?
On Tue, 25 Jun 2019 at 16:53, Andrii Nakryiko <andriin@...com> wrote:
>
> User and global data maps initialization has gotten pretty complicated
> and unnecessarily convoluted. This patch splits out the logic for global
> data map and user-defined map initialization. It also removes the
> restriction of pre-calculating how many maps will be initialized,
> instead allowing to keep adding new maps as they are discovered, which
> will be used later for BTF-defined map definitions.
>
> Signed-off-by: Andrii Nakryiko <andriin@...com>
> ---
> tools/lib/bpf/libbpf.c | 247 ++++++++++++++++++++++-------------------
> 1 file changed, 133 insertions(+), 114 deletions(-)
>
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 7ee44d8877c5..88609dca4f7d 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -234,6 +234,7 @@ struct bpf_object {
> size_t nr_programs;
> struct bpf_map *maps;
> size_t nr_maps;
> + size_t maps_cap;
> struct bpf_secdata sections;
>
> bool loaded;
> @@ -763,21 +764,51 @@ int bpf_object__variable_offset(const struct bpf_object *obj, const char *name,
> return -ENOENT;
> }
>
> -static bool bpf_object__has_maps(const struct bpf_object *obj)
> +static struct bpf_map *bpf_object__add_map(struct bpf_object *obj)
> {
> - return obj->efile.maps_shndx >= 0 ||
> - obj->efile.data_shndx >= 0 ||
> - obj->efile.rodata_shndx >= 0 ||
> - obj->efile.bss_shndx >= 0;
> + struct bpf_map *new_maps;
> + size_t new_cap;
> + int i;
> +
> + if (obj->nr_maps < obj->maps_cap)
> + return &obj->maps[obj->nr_maps++];
> +
> + new_cap = max(4ul, obj->maps_cap * 3 / 2);
> + new_maps = realloc(obj->maps, new_cap * sizeof(*obj->maps));
> + if (!new_maps) {
> + pr_warning("alloc maps for object failed\n");
> + return ERR_PTR(-ENOMEM);
> + }
> +
> + obj->maps_cap = new_cap;
> + obj->maps = new_maps;
> +
> + /* zero out new maps */
> + memset(obj->maps + obj->nr_maps, 0,
> + (obj->maps_cap - obj->nr_maps) * sizeof(*obj->maps));
> + /*
> + * fill all fd with -1 so won't close incorrect fd (fd=0 is stdin)
> + * when failure (zclose won't close negative fd)).
> + */
> + for (i = obj->nr_maps; i < obj->maps_cap; i++) {
> + obj->maps[i].fd = -1;
> + obj->maps[i].inner_map_fd = -1;
> + }
> +
> + return &obj->maps[obj->nr_maps++];
> }
>
> static int
> -bpf_object__init_internal_map(struct bpf_object *obj, struct bpf_map *map,
> - enum libbpf_map_type type, Elf_Data *data,
> - void **data_buff)
> +bpf_object__init_internal_map(struct bpf_object *obj, enum libbpf_map_type type,
> + Elf_Data *data, void **data_buff)
> {
> - struct bpf_map_def *def = &map->def;
> char map_name[BPF_OBJ_NAME_LEN];
> + struct bpf_map_def *def;
> + struct bpf_map *map;
> +
> + map = bpf_object__add_map(obj);
> + if (IS_ERR(map))
> + return PTR_ERR(map);
>
> map->libbpf_type = type;
> map->offset = ~(typeof(map->offset))0;
> @@ -789,6 +820,7 @@ bpf_object__init_internal_map(struct bpf_object *obj, struct bpf_map *map,
> return -ENOMEM;
> }
>
> + def = &map->def;
> def->type = BPF_MAP_TYPE_ARRAY;
> def->key_size = sizeof(int);
> def->value_size = data->d_size;
> @@ -808,29 +840,58 @@ bpf_object__init_internal_map(struct bpf_object *obj, struct bpf_map *map,
> return 0;
> }
>
> -static int bpf_object__init_maps(struct bpf_object *obj, int flags)
> +static int bpf_object__init_global_data_maps(struct bpf_object *obj)
> +{
> + int err;
> +
> + if (!obj->caps.global_data)
> + return 0;
> + /*
> + * Populate obj->maps with libbpf internal maps.
> + */
> + if (obj->efile.data_shndx >= 0) {
> + err = bpf_object__init_internal_map(obj, LIBBPF_MAP_DATA,
> + obj->efile.data,
> + &obj->sections.data);
> + if (err)
> + return err;
> + }
> + if (obj->efile.rodata_shndx >= 0) {
> + err = bpf_object__init_internal_map(obj, LIBBPF_MAP_RODATA,
> + obj->efile.rodata,
> + &obj->sections.rodata);
> + if (err)
> + return err;
> + }
> + if (obj->efile.bss_shndx >= 0) {
> + err = bpf_object__init_internal_map(obj, LIBBPF_MAP_BSS,
> + obj->efile.bss, NULL);
> + if (err)
> + return err;
> + }
> + return 0;
> +}
> +
> +static int bpf_object__init_user_maps(struct bpf_object *obj, bool strict)
> {
> - int i, map_idx, map_def_sz = 0, nr_syms, nr_maps = 0, nr_maps_glob = 0;
> - bool strict = !(flags & MAPS_RELAX_COMPAT);
> Elf_Data *symbols = obj->efile.symbols;
> + int i, map_def_sz = 0, nr_maps = 0, nr_syms;
> Elf_Data *data = NULL;
> - int ret = 0;
> + Elf_Scn *scn;
> +
> + if (obj->efile.maps_shndx < 0)
> + return 0;
>
> if (!symbols)
> return -EINVAL;
> - nr_syms = symbols->d_size / sizeof(GElf_Sym);
> -
> - if (obj->efile.maps_shndx >= 0) {
> - Elf_Scn *scn = elf_getscn(obj->efile.elf,
> - obj->efile.maps_shndx);
>
> - if (scn)
> - data = elf_getdata(scn, NULL);
> - if (!scn || !data) {
> - pr_warning("failed to get Elf_Data from map section %d\n",
> - obj->efile.maps_shndx);
> - return -EINVAL;
> - }
> + scn = elf_getscn(obj->efile.elf, obj->efile.maps_shndx);
> + if (scn)
> + data = elf_getdata(scn, NULL);
> + if (!scn || !data) {
> + pr_warning("failed to get Elf_Data from map section %d\n",
> + obj->efile.maps_shndx);
> + return -EINVAL;
> }
>
> /*
> @@ -840,16 +901,8 @@ static int bpf_object__init_maps(struct bpf_object *obj, int flags)
> *
> * TODO: Detect array of map and report error.
> */
> - if (obj->caps.global_data) {
> - if (obj->efile.data_shndx >= 0)
> - nr_maps_glob++;
> - if (obj->efile.rodata_shndx >= 0)
> - nr_maps_glob++;
> - if (obj->efile.bss_shndx >= 0)
> - nr_maps_glob++;
> - }
> -
> - for (i = 0; data && i < nr_syms; i++) {
> + nr_syms = symbols->d_size / sizeof(GElf_Sym);
> + for (i = 0; i < nr_syms; i++) {
> GElf_Sym sym;
>
> if (!gelf_getsym(symbols, i, &sym))
> @@ -858,79 +911,56 @@ static int bpf_object__init_maps(struct bpf_object *obj, int flags)
> continue;
> nr_maps++;
> }
> -
> - if (!nr_maps && !nr_maps_glob)
> - return 0;
> -
> /* Assume equally sized map definitions */
> - if (data) {
> - pr_debug("maps in %s: %d maps in %zd bytes\n", obj->path,
> - nr_maps, data->d_size);
> -
> - map_def_sz = data->d_size / nr_maps;
> - if (!data->d_size || (data->d_size % nr_maps) != 0) {
> - pr_warning("unable to determine map definition size "
> - "section %s, %d maps in %zd bytes\n",
> - obj->path, nr_maps, data->d_size);
> - return -EINVAL;
> - }
> - }
> -
> - nr_maps += nr_maps_glob;
> - obj->maps = calloc(nr_maps, sizeof(obj->maps[0]));
> - if (!obj->maps) {
> - pr_warning("alloc maps for object failed\n");
> - return -ENOMEM;
> - }
> - obj->nr_maps = nr_maps;
> -
> - for (i = 0; i < nr_maps; i++) {
> - /*
> - * fill all fd with -1 so won't close incorrect
> - * fd (fd=0 is stdin) when failure (zclose won't close
> - * negative fd)).
> - */
> - obj->maps[i].fd = -1;
> - obj->maps[i].inner_map_fd = -1;
> + pr_debug("maps in %s: %d maps in %zd bytes\n",
> + obj->path, nr_maps, data->d_size);
> +
> + map_def_sz = data->d_size / nr_maps;
> + if (!data->d_size || (data->d_size % nr_maps) != 0) {
> + pr_warning("unable to determine map definition size "
> + "section %s, %d maps in %zd bytes\n",
> + obj->path, nr_maps, data->d_size);
> + return -EINVAL;
> }
>
> - /*
> - * Fill obj->maps using data in "maps" section.
> - */
> - for (i = 0, map_idx = 0; data && i < nr_syms; i++) {
> + /* Fill obj->maps using data in "maps" section. */
> + for (i = 0; i < nr_syms; i++) {
> GElf_Sym sym;
> const char *map_name;
> struct bpf_map_def *def;
> + struct bpf_map *map;
>
> if (!gelf_getsym(symbols, i, &sym))
> continue;
> if (sym.st_shndx != obj->efile.maps_shndx)
> continue;
>
> - map_name = elf_strptr(obj->efile.elf,
> - obj->efile.strtabidx,
> + map = bpf_object__add_map(obj);
> + if (IS_ERR(map))
> + return PTR_ERR(map);
> +
> + map_name = elf_strptr(obj->efile.elf, obj->efile.strtabidx,
> sym.st_name);
> if (!map_name) {
> pr_warning("failed to get map #%d name sym string for obj %s\n",
> - map_idx, obj->path);
> + i, obj->path);
> return -LIBBPF_ERRNO__FORMAT;
> }
>
> - obj->maps[map_idx].libbpf_type = LIBBPF_MAP_UNSPEC;
> - obj->maps[map_idx].offset = sym.st_value;
> + map->libbpf_type = LIBBPF_MAP_UNSPEC;
> + map->offset = sym.st_value;
> if (sym.st_value + map_def_sz > data->d_size) {
> pr_warning("corrupted maps section in %s: last map \"%s\" too small\n",
> obj->path, map_name);
> return -EINVAL;
> }
>
> - obj->maps[map_idx].name = strdup(map_name);
> - if (!obj->maps[map_idx].name) {
> + map->name = strdup(map_name);
> + if (!map->name) {
> pr_warning("failed to alloc map name\n");
> return -ENOMEM;
> }
> - pr_debug("map %d is \"%s\"\n", map_idx,
> - obj->maps[map_idx].name);
> + pr_debug("map %d is \"%s\"\n", i, map->name);
> def = (struct bpf_map_def *)(data->d_buf + sym.st_value);
> /*
> * If the definition of the map in the object file fits in
> @@ -939,7 +969,7 @@ static int bpf_object__init_maps(struct bpf_object *obj, int flags)
> * calloc above.
> */
> if (map_def_sz <= sizeof(struct bpf_map_def)) {
> - memcpy(&obj->maps[map_idx].def, def, map_def_sz);
> + memcpy(&map->def, def, map_def_sz);
> } else {
> /*
> * Here the map structure being read is bigger than what
> @@ -959,37 +989,30 @@ static int bpf_object__init_maps(struct bpf_object *obj, int flags)
> return -EINVAL;
> }
> }
> - memcpy(&obj->maps[map_idx].def, def,
> - sizeof(struct bpf_map_def));
> + memcpy(&map->def, def, sizeof(struct bpf_map_def));
> }
> - map_idx++;
> }
> + return 0;
> +}
>
> - if (!obj->caps.global_data)
> - goto finalize;
> +static int bpf_object__init_maps(struct bpf_object *obj, int flags)
> +{
> + bool strict = !(flags & MAPS_RELAX_COMPAT);
> + int err;
>
> - /*
> - * Populate rest of obj->maps with libbpf internal maps.
> - */
> - if (obj->efile.data_shndx >= 0)
> - ret = bpf_object__init_internal_map(obj, &obj->maps[map_idx++],
> - LIBBPF_MAP_DATA,
> - obj->efile.data,
> - &obj->sections.data);
> - if (!ret && obj->efile.rodata_shndx >= 0)
> - ret = bpf_object__init_internal_map(obj, &obj->maps[map_idx++],
> - LIBBPF_MAP_RODATA,
> - obj->efile.rodata,
> - &obj->sections.rodata);
> - if (!ret && obj->efile.bss_shndx >= 0)
> - ret = bpf_object__init_internal_map(obj, &obj->maps[map_idx++],
> - LIBBPF_MAP_BSS,
> - obj->efile.bss, NULL);
> -finalize:
> - if (!ret)
> + err = bpf_object__init_user_maps(obj, strict);
> + if (err)
> + return err;
> +
> + err = bpf_object__init_global_data_maps(obj);
> + if (err)
> + return err;
> +
> + if (obj->nr_maps) {
> qsort(obj->maps, obj->nr_maps, sizeof(obj->maps[0]),
> compare_bpf_map);
> - return ret;
> + }
> + return 0;
> }
>
> static bool section_have_execinstr(struct bpf_object *obj, int idx)
> @@ -1262,14 +1285,10 @@ static int bpf_object__elf_collect(struct bpf_object *obj, int flags)
> return -LIBBPF_ERRNO__FORMAT;
> }
> err = bpf_object__load_btf(obj, btf_data, btf_ext_data);
> - if (err)
> - return err;
> - if (bpf_object__has_maps(obj)) {
> + if (!err)
> err = bpf_object__init_maps(obj, flags);
> - if (err)
> - return err;
> - }
> - err = bpf_object__init_prog_names(obj);
> + if (!err)
> + err = bpf_object__init_prog_names(obj);
> return err;
> }
>
> --
> 2.17.1
>
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