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bpf, docs: specify which BPF_ABS and BPF_IND fields were zero

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Specifying which fields were unused allows IANA to only list as deprecated
instructions that were actually used, leaving the rest as unassigned and
possibly available for future use for something else.

Signed-off-by: Dave Thaler <dthaler1968@gmail.com>
Acked-by: David Vernet <void@manifault.com>
Link: https://lore.kernel.org/r/20240221175419.16843-1-dthaler1968@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Dave Thaler 2024-02-21 09:54:19 -08:00 committed by Alexei Starovoitov
parent c1bb68f6b2
commit 89ee838130
1 changed files with 4 additions and 3 deletions
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7
Documentation/bpf/standardization/instruction-set.rst
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@ -658,6 +658,7 @@ Legacy BPF Packet access instructions
BPF previously introduced special instructions for access to packet data that were
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.
mode modifier of BPF_ABS or BPF_IND. The 'dst_reg' and 'offset' fields were
set to zero, and 'src_reg' was set to zero for BPF_ABS. However, these
instructions are deprecated and should no longer be used. All legacy packet
access instructions belong to the "legacy" conformance group.