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authorAndrii Nakryiko <andrii@kernel.org>2021-12-17 20:12:02 +0300
committerDaniel Borkmann <daniel@iogearbox.net>2021-12-18 01:11:13 +0300
commite967a20a8fabc6442a78e2e2059e63a4bb6aed08 (patch)
treeef89034eabd0e8f601c31630c2b3048353a7d1ce /tools/bpf
parent5a8ea82f9d25e88e502d1c3a1a9ba639f69a63c0 (diff)
downloadlinux-e967a20a8fabc6442a78e2e2059e63a4bb6aed08.tar.xz
bpftool: Reimplement large insn size limit feature probing
Reimplement bpf_probe_large_insn_limit() in bpftool, as that libbpf API is scheduled for deprecation in v0.8. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Dave Marchevsky <davemarchevsky@fb.com> Link: https://lore.kernel.org/bpf/20211217171202.3352835-4-andrii@kernel.org
Diffstat (limited to 'tools/bpf')
-rw-r--r--tools/bpf/bpftool/feature.c26
1 files changed, 23 insertions, 3 deletions
diff --git a/tools/bpf/bpftool/feature.c b/tools/bpf/bpftool/feature.c
index 5397077d0d9e..6719b9282eca 100644
--- a/tools/bpf/bpftool/feature.c
+++ b/tools/bpf/bpftool/feature.c
@@ -642,12 +642,32 @@ probe_helpers_for_progtype(enum bpf_prog_type prog_type, bool supported_type,
printf("\n");
}
-static void
-probe_large_insn_limit(const char *define_prefix, __u32 ifindex)
+/*
+ * Probe for availability of kernel commit (5.3):
+ *
+ * c04c0d2b968a ("bpf: increase complexity limit and maximum program size")
+ */
+static void probe_large_insn_limit(const char *define_prefix, __u32 ifindex)
{
+ LIBBPF_OPTS(bpf_prog_load_opts, opts,
+ .prog_ifindex = ifindex,
+ );
+ struct bpf_insn insns[BPF_MAXINSNS + 1];
bool res;
+ int i, fd;
+
+ for (i = 0; i < BPF_MAXINSNS; i++)
+ insns[i] = BPF_MOV64_IMM(BPF_REG_0, 1);
+ insns[BPF_MAXINSNS] = BPF_EXIT_INSN();
+
+ errno = 0;
+ fd = bpf_prog_load(BPF_PROG_TYPE_SCHED_CLS, NULL, "GPL",
+ insns, ARRAY_SIZE(insns), &opts);
+ res = fd >= 0 || (errno != E2BIG && errno != EINVAL);
+
+ if (fd >= 0)
+ close(fd);
- res = bpf_probe_large_insn_limit(ifindex);
print_bool_feature("have_large_insn_limit",
"Large program size limit",
"LARGE_INSN_LIMIT",