Commit 89ee8381 authored by Dave Thaler's avatar Dave Thaler Committed by Alexei Starovoitov
Browse files

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: default avatarDave Thaler <dthaler1968@gmail.com>
Acked-by: default avatarDavid Vernet <void@manifault.com>
Link: https://lore.kernel.org/r/20240221175419.16843-1-dthaler1968@gmail.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent c1bb68f6

Documentation/bpf/standardization/instruction-set.rst

+4 −3
Original line number Diff line number Diff line
@@ -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.