netdev - [PATCH 3/6] bpf, docs: Document the opcode classes

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Date:   Mon,  3 Jan 2022 19:35:53 +0100
From:   Christoph Hellwig <hch@....de>
To:     Jonathan Corbet <corbet@....net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Cc:     Martin KaFai Lau <kafai@...com>, Song Liu <songliubraving@...com>,
        Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, linux-doc@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH 3/6] bpf, docs: Document the opcode classes

Add a description for each opcode class.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 Documentation/bpf/instruction-set.rst | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/Documentation/bpf/instruction-set.rst b/Documentation/bpf/instruction-set.rst
index 03bf3c6c55771..2987cbb07f7f6 100644
--- a/Documentation/bpf/instruction-set.rst
+++ b/Documentation/bpf/instruction-set.rst
@@ -38,18 +38,18 @@ Instruction classes
 
 The three LSB bits of the 'opcode' field store the instruction class:
 
-  ========= =====
-  class     value
-  ========= =====
-  BPF_LD    0x00
-  BPF_LDX   0x01
-  BPF_ST    0x02
-  BPF_STX   0x03
-  BPF_ALU   0x04
-  BPF_JMP   0x05
-  BPF_JMP32 0x06
-  BPF_ALU64 0x07
-  ========= =====
+  =========  =====  ===============================
+  class      value  description
+  =========  =====  ===============================
+  BPF_LD     0x00   non-standard load operations
+  BPF_LDX    0x01   load into register operations
+  BPF_ST     0x02   store from immediate operations
+  BPF_STX    0x03   store from register operations
+  BPF_ALU    0x04   32-bit arithmetic operations
+  BPF_JMP    0x05   64-bit jump operations
+  BPF_JMP32  0x06   32-bit jump operations
+  BPF_ALU64  0x07   64-bit arithmetic operations
+  =========  =====  ===============================
 
 Arithmetic and jump instructions
 ================================
-- 
2.30.2