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From: Andrii Nakryiko <andrii@kernel.org>
To: <bpf@vger.kernel.org>, <ast@kernel.org>, <daniel@iogearbox.net>
Cc: <andrii@kernel.org>, <kernel-team@fb.com>
Subject: [PATCH bpf-next 2/7] libbpf: deprecate bpf_map__resize()
Date: Thu, 20 Jan 2022 16:41:10 -0800	[thread overview]
Message-ID: <20220121004115.3845888-3-andrii@kernel.org> (raw)
In-Reply-To: <20220121004115.3845888-1-andrii@kernel.org>

Deprecated bpf_map__resize() in favor of bpf_map__set_max_entries()
setter. In addition to having a surprising name (users often don't
realize that they need to use bpf_map__resize()), the name also implies
some magic way of resizing BPF map after it is created, which is clearly
not the case.

Another minor annoyance is that bpf_map__resize() disallows 0 value for
max_entries, which in some cases is totally acceptable (e.g., like for
BPF perf buf case to let libbpf auto-create one buffer per each
available CPU core).

  [0] https://github.com/libbpf/libbpf/issues/304

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
 tools/lib/bpf/libbpf.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index dbf37c0fa531..6f8e6b3cff84 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -716,6 +716,7 @@ LIBBPF_API int bpf_map__set_type(struct bpf_map *map, enum bpf_map_type type);
 /* get/set map size (max_entries) */
 LIBBPF_API __u32 bpf_map__max_entries(const struct bpf_map *map);
 LIBBPF_API int bpf_map__set_max_entries(struct bpf_map *map, __u32 max_entries);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_map__set_max_entries() instead")
 LIBBPF_API int bpf_map__resize(struct bpf_map *map, __u32 max_entries);
 /* get/set map flags */
 LIBBPF_API __u32 bpf_map__map_flags(const struct bpf_map *map);

  parent reply	other threads:[~2022-01-21  0:41 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-21  0:41 [PATCH bpf-next 0/7] libbpf: deprecate some setter and getter APIs Andrii Nakryiko
2022-01-21  0:41 ` [PATCH bpf-next 1/7] libbpf: hide and discourage inconsistently named getters Andrii Nakryiko
2022-01-21  0:41 ` Andrii Nakryiko [this message]
2022-01-21  0:43   ` [PATCH bpf-next 2/7] libbpf: deprecate bpf_map__resize() Andrii Nakryiko
2022-01-21  0:41 ` [PATCH bpf-next 3/7] libbpf: deprecate bpf_program__is_<type>() and bpf_program__set_<type>() APIs Andrii Nakryiko
2022-01-21  0:41 ` [PATCH bpf-next 4/7] bpftool: use preferred setters/getters instead of deprecated ones Andrii Nakryiko
2022-01-21  0:41 ` [PATCH bpf-next 5/7] selftests/bpf: use preferred setter/getter APIs " Andrii Nakryiko
2022-01-21  0:41 ` [PATCH bpf-next 6/7] samples/bpf: use preferred getters/setters " Andrii Nakryiko
2022-01-21  0:41 ` [PATCH bpf-next 7/7] perf: use generic bpf_program__set_type() to set BPF prog type Andrii Nakryiko

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