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bpf, docs: Add note about type convention

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Add explanation about use of "u64", "u32", etc. as
the type convention used in BPF documentation.

Signed-off-by: Dave Thaler <dthaler@microsoft.com>
Acked-by: David Vernet <void@manifault.com>
Link: https://lore.kernel.org/r/20230127014706.1005-1-dthaler1968@googlemail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Dave Thaler 2023-01-27 01:47:06 +00:00 committed by Alexei Starovoitov
parent 27b53b7364
commit d00d5b82f0
1 changed files with 7 additions and 0 deletions
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7
Documentation/bpf/instruction-set.rst
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@ -7,6 +7,11 @@ eBPF Instruction Set Specification, v1.0
This document specifies version 1.0 of the eBPF instruction set.
Documentation conventions
=========================
For brevity, this document uses the type notion "u64", "u32", etc.
to mean an unsigned integer whose width is the specified number of bits.
Registers and calling convention
================================
@ -164,6 +169,8 @@ the destination register is unchanged whereas for ``BPF_ALU`` the upper
dst = (u32) ((u32) dst + (u32) src)
where '(u32)' indicates that the upper 32 bits are zeroed.
``BPF_ADD | BPF_X | BPF_ALU64`` means::
dst = dst + src