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faef26fa44
For those locations where we use an immediate tail call map index use the newly added bpf_tail_call_static() helper. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Martin KaFai Lau <kafai@fb.com> Link: https://lore.kernel.org/bpf/3cfb2b799a62d22c6e7ae5897c23940bdcc24cbc.1601477936.git.daniel@iogearbox.net
61 lines
1.1 KiB
C
61 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include "bpf_legacy.h"
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struct {
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__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
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__uint(max_entries, 2);
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__uint(key_size, sizeof(__u32));
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__uint(value_size, sizeof(__u32));
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} jmp_table SEC(".maps");
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__noinline
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int subprog_tail2(struct __sk_buff *skb)
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{
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volatile char arr[64] = {};
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if (load_word(skb, 0) || load_half(skb, 0))
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bpf_tail_call_static(skb, &jmp_table, 10);
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else
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bpf_tail_call_static(skb, &jmp_table, 1);
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return skb->len;
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}
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static __noinline
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int subprog_tail(struct __sk_buff *skb)
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{
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volatile char arr[64] = {};
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bpf_tail_call_static(skb, &jmp_table, 0);
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return skb->len * 2;
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}
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SEC("classifier/0")
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int bpf_func_0(struct __sk_buff *skb)
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{
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volatile char arr[128] = {};
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return subprog_tail2(skb);
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}
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SEC("classifier/1")
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int bpf_func_1(struct __sk_buff *skb)
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{
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volatile char arr[128] = {};
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return skb->len * 3;
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}
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SEC("classifier")
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int entry(struct __sk_buff *skb)
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{
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volatile char arr[128] = {};
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return subprog_tail(skb);
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}
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char __license[] SEC("license") = "GPL";
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int _version SEC("version") = 1;
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