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libbpf: enforce strict libbpf 1.0 behaviors

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Remove support for legacy features and behaviors that previously had to
be disabled by calling libbpf_set_strict_mode():
  - legacy BPF map definitions are not supported now;
  - RLIMIT_MEMLOCK auto-setting, if necessary, is always on (but see
    libbpf_set_memlock_rlim());
  - program name is used for program pinning (instead of section name);
  - cleaned up error returning logic;
  - entry BPF programs should have SEC() always.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20220627211527.2245459-15-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko
2022-06-27 14:15:26 -07:00
committed by Andrii Nakryiko
parent fcd1b668c6
commit 62e8af46d2
5 changed files with 36 additions and 260 deletions
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34
src/libbpf.h
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@@ -886,40 +886,6 @@ LIBBPF_API int bpf_map__lookup_and_delete_elem(const struct bpf_map *map,
LIBBPF_API int bpf_map__get_next_key(const struct bpf_map *map,
const void *cur_key, void *next_key, size_t key_sz);
/**
* @brief **libbpf_get_error()** extracts the error code from the passed
* pointer
* @param ptr pointer returned from libbpf API function
* @return error code; or 0 if no error occured
*
* Many libbpf API functions which return pointers have logic to encode error
* codes as pointers, and do not return NULL. Meaning **libbpf_get_error()**
* should be used on the return value from these functions immediately after
* calling the API function, with no intervening calls that could clobber the
* `errno` variable. Consult the individual functions documentation to verify
* if this logic applies should be used.
*
* For these API functions, if `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)`
* is enabled, NULL is returned on error instead.
*
* If ptr is NULL, then errno should be already set by the failing
* API, because libbpf never returns NULL on success and it now always
* sets errno on error.
*
* Example usage:
*
* struct perf_buffer *pb;
*
* pb = perf_buffer__new(bpf_map__fd(obj->maps.events), PERF_BUFFER_PAGES, &opts);
* err = libbpf_get_error(pb);
* if (err) {
* pb = NULL;
* fprintf(stderr, "failed to open perf buffer: %d\n", err);
* goto cleanup;
* }
*/
LIBBPF_API long libbpf_get_error(const void *ptr);
struct bpf_xdp_set_link_opts {
size_t sz;
int old_fd;