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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 6/6] libbpf: Add getter for program size
Date: Thu, 07 Nov 2019 17:52:24 +0100	[thread overview]
Message-ID: <157314554482.693412.362818059218610123.stgit@toke.dk> (raw)
In-Reply-To: <157314553801.693412.15522462897300280861.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.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
---
 tools/lib/bpf/libbpf.c   |    5 +++++
 tools/lib/bpf/libbpf.h   |    1 +
 tools/lib/bpf/libbpf.map |    1 +
 3 files changed, 7 insertions(+)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 582c0fd16697..facd5e1a3a0b 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -4790,6 +4790,11 @@ 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..10875dc68ec8 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -213,6 +213,7 @@ 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);
+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);
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 45f229af2766..f37d949917d2 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -202,5 +202,6 @@ LIBBPF_0.0.6 {
 		bpf_program__get_type;
 		bpf_program__is_tracing;
 		bpf_program__set_tracing;
+		bpf_program__size;
 		bpf_get_link_xdp_info;
 } LIBBPF_0.0.5;


  parent reply	other threads:[~2019-11-07 16:52 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-07 16:52 [PATCH bpf-next 0/6] libbpf: Fix pinning and error message bugs and add new getters Toke Høiland-Jørgensen
2019-11-07 16:52 ` [PATCH bpf-next 1/6] libbpf: Unpin auto-pinned maps if loading fails Toke Høiland-Jørgensen
2019-11-08 19:27   ` Song Liu
2019-11-07 16:52 ` [PATCH bpf-next 2/6] selftests/bpf: Add tests for automatic map unpinning on load failure Toke Høiland-Jørgensen
2019-11-08 19:33   ` Song Liu
2019-11-08 20:00     ` Toke Høiland-Jørgensen
2019-11-07 16:52 ` [PATCH bpf-next 3/6] libbpf: Propagate EPERM to caller on program load Toke Høiland-Jørgensen
2019-11-08 19:36   ` Song Liu
2019-11-07 16:52 ` [PATCH bpf-next 4/6] libbpf: Use pr_warn() when printing netlink errors Toke Høiland-Jørgensen
2019-11-08 19:37   ` Song Liu
2019-11-07 16:52 ` [PATCH bpf-next 5/6] libbpf: Add bpf_get_link_xdp_info() function to get more XDP information Toke Høiland-Jørgensen
2019-11-08 19:52   ` Song Liu
2019-11-08 20:04     ` Toke Høiland-Jørgensen
2019-11-07 16:52 ` Toke Høiland-Jørgensen [this message]
2019-11-08 19:55   ` [PATCH bpf-next 6/6] libbpf: Add getter for program size Song Liu

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