Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
authored by
Andrii Nakryiko
and committed by
Daniel Borkmann
e967a20a
5a8ea82f
+23
-3
+23
-3
tools/bpf/bpftool/feature.c
+23
-3
tools/bpf/bpftool/feature.c
···
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printf("\n");
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}
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-
static void
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probe_large_insn_limit(const char *define_prefix, __u32 ifindex)
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/*
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* Probe for availability of kernel commit (5.3):
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*
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* c04c0d2b968a ("bpf: increase complexity limit and maximum program size")
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*/
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static void probe_large_insn_limit(const char *define_prefix, __u32 ifindex)
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{
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LIBBPF_OPTS(bpf_prog_load_opts, opts,
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.prog_ifindex = ifindex,
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);
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struct bpf_insn insns[BPF_MAXINSNS + 1];
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bool res;
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int i, fd;
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res = bpf_probe_large_insn_limit(ifindex);
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for (i = 0; i < BPF_MAXINSNS; i++)
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insns[i] = BPF_MOV64_IMM(BPF_REG_0, 1);
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insns[BPF_MAXINSNS] = BPF_EXIT_INSN();
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errno = 0;
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fd = bpf_prog_load(BPF_PROG_TYPE_SCHED_CLS, NULL, "GPL",
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insns, ARRAY_SIZE(insns), &opts);
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res = fd >= 0 || (errno != E2BIG && errno != EINVAL);
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if (fd >= 0)
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close(fd);
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print_bool_feature("have_large_insn_limit",
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"Large program size limit",
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"LARGE_INSN_LIMIT",