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bpf, docs: Clarify which legacy packet instructions existed

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As discussed on the BPF IETF mailing list (see link), this patch updates
the "Legacy BPF Packet access instructions" section to clarify which
instructions are deprecated (vs which were never defined and so are not
deprecated).

Signed-off-by: Dave Thaler <dthaler1968@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Acked-by: David Vernet <void@manifault.com>
Link: https://mailarchive.ietf.org/arch/msg/bpf/5LnnKm093cGpOmDI9TnLQLBXyys
Link: https://lore.kernel.org/bpf/20240131033759.3634-1-dthaler1968@gmail.com
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Dave Thaler 2024-01-30 19:37:59 -08:00 committed by Daniel Borkmann
parent 8263b3382d
commit 088a464ed5
1 changed files with 3 additions and 1 deletions
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Documentation/bpf/standardization/instruction-set.rst
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@ -630,7 +630,9 @@ Legacy BPF Packet access instructions
-------------------------------------
BPF previously introduced special instructions for access to packet data that were
carried over from classic BPF. However, these instructions are
carried over from classic BPF. These instructions used an instruction
class of BPF_LD, a size modifier of BPF_W, BPF_H, or BPF_B, and a
mode modifier of BPF_ABS or BPF_IND. However, these instructions are
deprecated and should no longer be used. All legacy packet access
instructions belong to the "legacy" conformance group instead of the "basic"
conformance group.