[PATCH bpf-next] bpf, docs: Clarify which legacy packet instructions existed

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As discussed in mailing list discussion at
https://mailarchive.ietf.org/arch/msg/bpf/5LnnKm093cGpOmDI9TnLQLBXyys/
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@xxxxxxxxx>
---
 Documentation/bpf/standardization/instruction-set.rst | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/bpf/standardization/instruction-set.rst b/Documentation/bpf/standardization/instruction-set.rst
index af43227b6..cf08337bf 100644
--- a/Documentation/bpf/standardization/instruction-set.rst
+++ b/Documentation/bpf/standardization/instruction-set.rst
@@ -635,7 +635,9 @@ 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.
-- 
2.40.1





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