bpf: Update the struct_ops of a bpf_link.

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By improving the BPF_LINK_UPDATE command of bpf(), it should allow you
to conveniently switch between different struct_ops on a single
bpf_link. This would enable smoother transitions from one struct_ops
to another.

The struct_ops maps passing along with BPF_LINK_UPDATE should have the
BPF_F_LINK flag.

Signed-off-by: Kui-Feng Lee <kuifeng@meta.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20230323032405.3735486-6-kuifeng@meta.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>

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This commit is contained in:

Kui-Feng Lee 2023-03-22 20:24:02 -07:00 • committed by Martin KaFai Lau

parent 8d1608d709

commit aef56f2e91

6 changed files with 122 additions and 11 deletions

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3

include/linux/bpf.h

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13

include/uapi/linux/bpf.h

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48

kernel/bpf/bpf_struct_ops.c

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34

kernel/bpf/syscall.c

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6

net/ipv4/bpf_tcp_ca.c

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13

tools/include/uapi/linux/bpf.h

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