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| author | Dave Thaler <dthaler1968@googlemail.com> | 2024-02-21 09:54:19 -0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2024-02-22 09:11:49 -0800 |
| commit | 89ee838130f470afcd02b30ca868f236a3f3b1d2 (patch) | |
| tree | 601d5b8af76dcb769c9a5331cf35231d458422d3 /Documentation/bpf | |
| parent | c1bb68f6b2f6be5297c5fbad5caebf67d0dd3034 (diff) | |
| download | linux-89ee838130f470afcd02b30ca868f236a3f3b1d2.tar.gz linux-89ee838130f470afcd02b30ca868f236a3f3b1d2.tar.bz2 linux-89ee838130f470afcd02b30ca868f236a3f3b1d2.zip | |
bpf, docs: specify which BPF_ABS and BPF_IND fields were zero
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>
Diffstat (limited to 'Documentation/bpf')
| -rw-r--r-- | Documentation/bpf/standardization/instruction-set.rst | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/Documentation/bpf/standardization/instruction-set.rst b/Documentation/bpf/standardization/instruction-set.rst index 45cffe94c752..f3269d6dd5e0 100644 --- a/Documentation/bpf/standardization/instruction-set.rst +++ b/Documentation/bpf/standardization/instruction-set.rst @@ -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. |