b1c2ce11d4
Non-ancient ip (iproute2-5.15.0, libbpf 0.7.0) refuses to load the sample with maps because we don't generate BTF: libbpf: BTF is required, but is missing or corrupted. ERROR: opening BPF object file failed Enable BTF by adding -g to clang flags. With that done neither of the programs load: libbpf: prog 'func': error relocating .BTF.ext function info: -22 libbpf: prog 'func': failed to relocate calls: -22 libbpf: failed to load object 'ksft-net-drv/net/sample_ret0.bpf.o' Andrii explains that this is because we don't specify section names for the code. Add the section names, too. Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Stanislav Fomichev <sdf@google.com> Acked-by: Martin KaFai Lau <martin.lau@kernel.org> Link: https://lore.kernel.org/r/20240409031549.3531084-4-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
34 lines
677 B
C
34 lines
677 B
C
/* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__type(key, __u32);
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__type(value, long);
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__uint(max_entries, 2);
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} htab SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__type(key, __u32);
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__type(value, long);
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__uint(max_entries, 2);
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} array SEC(".maps");
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/* Sample program which should always load for testing control paths. */
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SEC("xdp") int func()
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{
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__u64 key64 = 0;
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__u32 key = 0;
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long *value;
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value = bpf_map_lookup_elem(&htab, &key);
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if (!value)
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return 1;
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value = bpf_map_lookup_elem(&array, &key64);
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if (!value)
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return 1;
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return 0;
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}
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