LoongArch: BPF: Add timed may_goto implementation

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Implement arch_bpf_timed_may_goto() support and advertise it through
bpf_jit_supports_timed_may_goto() so the verifier lowers may_goto into
the timed variant: instead of a fixed iteration counter, the loop is
bounded by a wall-clock timeout maintained in a per-loop stack slot.

arch_bpf_timed_may_goto() uses a custom calling convention: the verifier
passes the count/timestamp stack offset in BPF_REG_AX and expects the
updated count back in the same register. The JIT call path therefore can
skip the usual 'BPF_REG_0 = C return value' move for this helper.

Acked-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Tested-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: George Guo <guodongtai@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

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George Guo 2026-08-17 22:07:40 +08:00 • committed by Huacai Chen

parent 1db6d003e9

commit 3fbf3534c2

3 changed files with 60 additions and 2 deletions

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2

arch/loongarch/net/Makefile

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13

arch/loongarch/net/bpf_jit.c

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47

arch/loongarch/net/bpf_timed_may_goto.S

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