netdev - Re: [PATCH net-next 06/12] tools: bpftool: add JSON output for `bpftool prog dump xlated *` command

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Date:   Mon, 23 Oct 2017 22:32:20 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        netdev@...r.kernel.org
CC:     oss-drivers@...ronome.com, alexei.starovoitov@...il.com,
        Quentin Monnet <quentin.monnet@...ronome.com>
Subject: Re: [PATCH net-next 06/12] tools: bpftool: add JSON output for `bpftool
 prog dump xlated *` command

On 10/23/2017 06:24 PM, Jakub Kicinski wrote:
> From: Quentin Monnet <quentin.monnet@...ronome.com>
>
> Add a new printing function to dump translated eBPF instructions as
> JSON. As for plain output, opcodes are printed only on request (when
> `opcodes` is provided on the command line).
>
> The disassembled output is generated by the same code that is used by
> the kernel verifier.
>
> Example output:
>
>      $ bpftool --json --pretty prog dump xlated id 1
>      [{
>              "disasm": "(bf) r6 = r1"
>          },{
>              "disasm": "(61) r7 = *(u32 *)(r6 +16)"
>          },{
>              "disasm": "(95) exit"
>          }
>      ]
>
>      $ bpftool --json --pretty prog dump xlated id 1 opcodes
>      [{
>              "disasm": "(bf) r6 = r1",
>              "opcodes": {
>                  "code": "0xbf",
>                  "src_reg": "0x1",
>                  "dst_reg": "0x6",
>                  "off": ["0x00","0x00"
>                  ],
>                  "imm": ["0x00","0x00","0x00","0x00"
>                  ]
>              }
>          },{
>              "disasm": "(61) r7 = *(u32 *)(r6 +16)",
>              "opcodes": {
>                  "code": "0x61",
>                  "src_reg": "0x6",
>                  "dst_reg": "0x7",
>                  "off": ["0x10","0x00"
>                  ],
>                  "imm": ["0x00","0x00","0x00","0x00"
>                  ]
>              }
>          },{
>              "disasm": "(95) exit",
>              "opcodes": {
>                  "code": "0x95",
>                  "src_reg": "0x0",
>                  "dst_reg": "0x0",
>                  "off": ["0x00","0x00"
>                  ],
>                  "imm": ["0x00","0x00","0x00","0x00"
>                  ]
>              }
>          }
>      ]
>
> Signed-off-by: Quentin Monnet <quentin.monnet@...ronome.com>

Acked-by: Daniel Borkmann <daniel@...earbox.net>