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From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <ast@kernel.org>,
	Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
	Yonghong Song <yhs@fb.com>,
	Jesper Dangaard Brouer <brouer@redhat.com>,
	Andrii Nakryiko <andrii.nakryiko@gmail.com>,
	David Miller <davem@davemloft.net>,
	netdev@vger.kernel.org, bpf@vger.kernel.org
Subject: [PATCH bpf-next v4 6/6] libbpf: Add getter for program size
Date: Sat, 09 Nov 2019 21:37:32 +0100	[thread overview]
Message-ID: <157333185272.88376.10996937115395724683.stgit@toke.dk> (raw)
In-Reply-To: <157333184619.88376.13377736576285554047.stgit@toke.dk>

From: Toke Høiland-Jørgensen <toke@redhat.com>

This adds a new getter for the BPF program size (in bytes). This is useful
for a caller that is trying to predict how much memory will be locked by
loading a BPF object into the kernel.

Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
 tools/lib/bpf/libbpf.c   |    5 +++++
 tools/lib/bpf/libbpf.h   |    3 +++
 tools/lib/bpf/libbpf.map |    1 +
 3 files changed, 9 insertions(+)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 094f5c64611a..70fec4a565af 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -4782,6 +4782,11 @@ int bpf_program__fd(const struct bpf_program *prog)
 	return bpf_program__nth_fd(prog, 0);
+size_t bpf_program__size(const struct bpf_program *prog)
+	return prog->insns_cnt * sizeof(struct bpf_insn);
 int bpf_program__set_prep(struct bpf_program *prog, int nr_instances,
 			  bpf_program_prep_t prep)
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index f0947cc949d2..5aa27caad6c2 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -214,6 +214,9 @@ LIBBPF_API void bpf_program__set_ifindex(struct bpf_program *prog,
 LIBBPF_API const char *bpf_program__title(const struct bpf_program *prog,
 					  bool needs_copy);
+/* returns program size in bytes */
+LIBBPF_API size_t bpf_program__size(const struct bpf_program *prog);
 LIBBPF_API int bpf_program__load(struct bpf_program *prog, char *license,
 				 __u32 kern_version);
 LIBBPF_API int bpf_program__fd(const struct bpf_program *prog);
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index d1a782a3a58d..9f39ee06b2d4 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -203,4 +203,5 @@ LIBBPF_0.0.6 {
+		bpf_program__size;
 } LIBBPF_0.0.5;

  parent reply	other threads:[~2019-11-09 20:37 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-09 20:37 [PATCH bpf-next v4 0/6] libbpf: Fix pinning and error message bugs and add new getters Toke Høiland-Jørgensen
2019-11-09 20:37 ` [PATCH bpf-next v4 1/6] libbpf: Unpin auto-pinned maps if loading fails Toke Høiland-Jørgensen
2019-11-09 20:37 ` [PATCH bpf-next v4 2/6] selftests/bpf: Add tests for automatic map unpinning on load failure Toke Høiland-Jørgensen
2019-11-09 20:37 ` [PATCH bpf-next v4 3/6] libbpf: Propagate EPERM to caller on program load Toke Høiland-Jørgensen
2019-11-09 20:37 ` [PATCH bpf-next v4 4/6] libbpf: Use pr_warn() when printing netlink errors Toke Høiland-Jørgensen
2019-11-09 20:37 ` [PATCH bpf-next v4 5/6] libbpf: Add bpf_get_link_xdp_info() function to get more XDP information Toke Høiland-Jørgensen
2019-11-10  6:32   ` Andrii Nakryiko
2019-11-09 20:37 ` Toke Høiland-Jørgensen [this message]
2019-11-11  3:29 ` [PATCH bpf-next v4 0/6] libbpf: Fix pinning and error message bugs and add new getters Alexei Starovoitov

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