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tools/bpf: Support new uapi for map element bpf iterator

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Previous commit adjusted kernel uapi for map
element bpf iterator. This patch adjusted libbpf API
due to uapi change. bpftool and bpf_iter selftests
are also changed accordingly.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20200805055058.1457623-1-yhs@fb.com
This commit is contained in:
Yonghong Song 2020-08-04 22:50:58 -07:00 committed by Alexei Starovoitov
parent 5e7b30205c
commit 74fc097de3
7 changed files with 58 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
tools/bpf/bpftool/iter.c
View File

@ -11,6 +11,7 @@
static int do_pin(int argc, char **argv)
{
DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, iter_opts);
union bpf_iter_link_info linfo;
const char *objfile, *path;
struct bpf_program *prog;
struct bpf_object *obj;
@ -36,6 +37,11 @@ static int do_pin(int argc, char **argv)
map_fd = map_parse_fd(&argc, &argv);
if (map_fd < 0)
return -1;
memset(&linfo, 0, sizeof(linfo));
linfo.map.map_fd = map_fd;
iter_opts.link_info = &linfo;
iter_opts.link_info_len = sizeof(linfo);
}
}
@ -57,9 +63,6 @@ static int do_pin(int argc, char **argv)
goto close_obj;
}
if (map_fd >= 0)
iter_opts.map_fd = map_fd;
link = bpf_program__attach_iter(prog, &iter_opts);
if (IS_ERR(link)) {
err = PTR_ERR(link);

15
tools/include/uapi/linux/bpf.h
View File

@ -81,6 +81,12 @@ struct bpf_cgroup_storage_key {
__u32 attach_type; /* program attach type */
};
union bpf_iter_link_info {
struct {
__u32 map_fd;
} map;
};
/* BPF syscall commands, see bpf(2) man-page for details. */
enum bpf_cmd {
BPF_MAP_CREATE,
@ -249,13 +255,6 @@ enum bpf_link_type {
MAX_BPF_LINK_TYPE,
};
enum bpf_iter_link_info {
BPF_ITER_LINK_UNSPEC = 0,
BPF_ITER_LINK_MAP_FD = 1,
MAX_BPF_ITER_LINK_INFO,
};
/* cgroup-bpf attach flags used in BPF_PROG_ATTACH command
*
* NONE(default): No further bpf programs allowed in the subtree.
@ -623,6 +622,8 @@ union bpf_attr {
};
__u32 attach_type; /* attach type */
__u32 flags; /* extra flags */
__aligned_u64 iter_info; /* extra bpf_iter_link_info */
__u32 iter_info_len; /* iter_info length */
} link_create;
struct { /* struct used by BPF_LINK_UPDATE command */

3
tools/lib/bpf/bpf.c
View File

@ -599,6 +599,9 @@ int bpf_link_create(int prog_fd, int target_fd,
attr.link_create.target_fd = target_fd;
attr.link_create.attach_type = attach_type;
attr.link_create.flags = OPTS_GET(opts, flags, 0);
attr.link_create.iter_info =
ptr_to_u64(OPTS_GET(opts, iter_info, (void *)0));
attr.link_create.iter_info_len = OPTS_GET(opts, iter_info_len, 0);
return sys_bpf(BPF_LINK_CREATE, &attr, sizeof(attr));
}

5
tools/lib/bpf/bpf.h
View File

@ -168,11 +168,14 @@ LIBBPF_API int bpf_prog_detach(int attachable_fd, enum bpf_attach_type type);
LIBBPF_API int bpf_prog_detach2(int prog_fd, int attachable_fd,
enum bpf_attach_type type);
union bpf_iter_link_info; /* defined in up-to-date linux/bpf.h */
struct bpf_link_create_opts {
size_t sz; /* size of this struct for forward/backward compatibility */
__u32 flags;
union bpf_iter_link_info *iter_info;
__u32 iter_info_len;
};
#define bpf_link_create_opts__last_field flags
#define bpf_link_create_opts__last_field iter_info_len
LIBBPF_API int bpf_link_create(int prog_fd, int target_fd,
enum bpf_attach_type attach_type,

6
tools/lib/bpf/libbpf.c
View File

@ -8306,10 +8306,8 @@ bpf_program__attach_iter(struct bpf_program *prog,
if (!OPTS_VALID(opts, bpf_iter_attach_opts))
return ERR_PTR(-EINVAL);
if (OPTS_HAS(opts, map_fd)) {
target_fd = opts->map_fd;
link_create_opts.flags = BPF_ITER_LINK_MAP_FD;
}
link_create_opts.iter_info = OPTS_GET(opts, link_info, (void *)0);
link_create_opts.iter_info_len = OPTS_GET(opts, link_info_len, 0);
prog_fd = bpf_program__fd(prog);
if (prog_fd < 0) {

5
tools/lib/bpf/libbpf.h
View File

@ -267,9 +267,10 @@ LIBBPF_API struct bpf_link *bpf_map__attach_struct_ops(struct bpf_map *map);
struct bpf_iter_attach_opts {
size_t sz; /* size of this struct for forward/backward compatibility */
__u32 map_fd;
union bpf_iter_link_info *link_info;
__u32 link_info_len;
};
#define bpf_iter_attach_opts__last_field map_fd
#define bpf_iter_attach_opts__last_field link_info_len
LIBBPF_API struct bpf_link *
bpf_program__attach_iter(struct bpf_program *prog,

40
tools/testing/selftests/bpf/prog_tests/bpf_iter.c
View File

@ -468,6 +468,7 @@ static void test_bpf_hash_map(void)
DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts);
struct bpf_iter_bpf_hash_map *skel;
int err, i, len, map_fd, iter_fd;
union bpf_iter_link_info linfo;
__u64 val, expected_val = 0;
struct bpf_link *link;
struct key_t {
@ -490,13 +491,16 @@ static void test_bpf_hash_map(void)
goto out;
/* iterator with hashmap2 and hashmap3 should fail */
opts.map_fd = bpf_map__fd(skel->maps.hashmap2);
memset(&linfo, 0, sizeof(linfo));
linfo.map.map_fd = bpf_map__fd(skel->maps.hashmap2);
opts.link_info = &linfo;
opts.link_info_len = sizeof(linfo);
link = bpf_program__attach_iter(skel->progs.dump_bpf_hash_map, &opts);
if (CHECK(!IS_ERR(link), "attach_iter",
"attach_iter for hashmap2 unexpected succeeded\n"))
goto out;
opts.map_fd = bpf_map__fd(skel->maps.hashmap3);
linfo.map.map_fd = bpf_map__fd(skel->maps.hashmap3);
link = bpf_program__attach_iter(skel->progs.dump_bpf_hash_map, &opts);
if (CHECK(!IS_ERR(link), "attach_iter",
"attach_iter for hashmap3 unexpected succeeded\n"))
@ -519,7 +523,7 @@ static void test_bpf_hash_map(void)
goto out;
}
opts.map_fd = map_fd;
linfo.map.map_fd = map_fd;
link = bpf_program__attach_iter(skel->progs.dump_bpf_hash_map, &opts);
if (CHECK(IS_ERR(link), "attach_iter", "attach_iter failed\n"))
goto out;
@ -562,6 +566,7 @@ static void test_bpf_percpu_hash_map(void)
DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts);
struct bpf_iter_bpf_percpu_hash_map *skel;
int err, i, j, len, map_fd, iter_fd;
union bpf_iter_link_info linfo;
__u32 expected_val = 0;
struct bpf_link *link;
struct key_t {
@ -606,7 +611,10 @@ static void test_bpf_percpu_hash_map(void)
goto out;
}
opts.map_fd = map_fd;
memset(&linfo, 0, sizeof(linfo));
linfo.map.map_fd = map_fd;
opts.link_info = &linfo;
opts.link_info_len = sizeof(linfo);
link = bpf_program__attach_iter(skel->progs.dump_bpf_percpu_hash_map, &opts);
if (CHECK(IS_ERR(link), "attach_iter", "attach_iter failed\n"))
goto out;
@ -649,6 +657,7 @@ static void test_bpf_array_map(void)
DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts);
__u32 expected_key = 0, res_first_key;
struct bpf_iter_bpf_array_map *skel;
union bpf_iter_link_info linfo;
int err, i, map_fd, iter_fd;
struct bpf_link *link;
char buf[64] = {};
@ -673,7 +682,10 @@ static void test_bpf_array_map(void)
goto out;
}
opts.map_fd = map_fd;
memset(&linfo, 0, sizeof(linfo));
linfo.map.map_fd = map_fd;
opts.link_info = &linfo;
opts.link_info_len = sizeof(linfo);
link = bpf_program__attach_iter(skel->progs.dump_bpf_array_map, &opts);
if (CHECK(IS_ERR(link), "attach_iter", "attach_iter failed\n"))
goto out;
@ -730,6 +742,7 @@ static void test_bpf_percpu_array_map(void)
DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts);
struct bpf_iter_bpf_percpu_array_map *skel;
__u32 expected_key = 0, expected_val = 0;
union bpf_iter_link_info linfo;
int err, i, j, map_fd, iter_fd;
struct bpf_link *link;
char buf[64];
@ -765,7 +778,10 @@ static void test_bpf_percpu_array_map(void)
goto out;
}
opts.map_fd = map_fd;
memset(&linfo, 0, sizeof(linfo));
linfo.map.map_fd = map_fd;
opts.link_info = &linfo;
opts.link_info_len = sizeof(linfo);
link = bpf_program__attach_iter(skel->progs.dump_bpf_percpu_array_map, &opts);
if (CHECK(IS_ERR(link), "attach_iter", "attach_iter failed\n"))
goto out;
@ -803,6 +819,7 @@ static void test_bpf_sk_storage_map(void)
DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts);
int err, i, len, map_fd, iter_fd, num_sockets;
struct bpf_iter_bpf_sk_storage_map *skel;
union bpf_iter_link_info linfo;
int sock_fd[3] = {-1, -1, -1};
__u32 val, expected_val = 0;
struct bpf_link *link;
@ -829,7 +846,10 @@ static void test_bpf_sk_storage_map(void)
goto out;
}
opts.map_fd = map_fd;
memset(&linfo, 0, sizeof(linfo));
linfo.map.map_fd = map_fd;
opts.link_info = &linfo;
opts.link_info_len = sizeof(linfo);
link = bpf_program__attach_iter(skel->progs.dump_bpf_sk_storage_map, &opts);
if (CHECK(IS_ERR(link), "attach_iter", "attach_iter failed\n"))
goto out;
@ -871,6 +891,7 @@ static void test_rdonly_buf_out_of_bound(void)
{
DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts);
struct bpf_iter_test_kern5 *skel;
union bpf_iter_link_info linfo;
struct bpf_link *link;
skel = bpf_iter_test_kern5__open_and_load();
@ -878,7 +899,10 @@ static void test_rdonly_buf_out_of_bound(void)
"skeleton open_and_load failed\n"))
return;
opts.map_fd = bpf_map__fd(skel->maps.hashmap1);
memset(&linfo, 0, sizeof(linfo));
linfo.map.map_fd = bpf_map__fd(skel->maps.hashmap1);
opts.link_info = &linfo;
opts.link_info_len = sizeof(linfo);
link = bpf_program__attach_iter(skel->progs.dump_bpf_hash_map, &opts);
if (CHECK(!IS_ERR(link), "attach_iter", "unexpected success\n"))
bpf_link__destroy(link);