linux-kernel - RE: [PATCH bpf-next 1/4] bpf: Add new macro BPF_ALU32 and BPF

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Date:   Wed, 1 Feb 2023 14:59:52 +0000
From:   Dave Thaler <dthaler@...rosoft.com>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
CC:     "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bpf@...f.org" <bpf@...f.org>
Subject: RE: [PATCH bpf-next 1/4] bpf: Add new macro BPF_ALU32 and BPF_JMP64

Forwarding this to the bpf@...f.org list for visibility, since the instruction-set.rst
change would affect the Internet Draft proposed for cross-platform standardization.

> -----Original Message-----
> From: Tiezhu Yang <yangtiezhu@...ngson.cn>
> Sent: Wednesday, February 1, 2023 4:37 AM
> To: Alexei Starovoitov <ast@...nel.org>; Daniel Borkmann
> <daniel@...earbox.net>; Andrii Nakryiko <andrii@...nel.org>
> Cc: bpf@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [PATCH bpf-next 1/4] bpf: Add new macro BPF_ALU32 and
> BPF_JMP64
> 
> In the current code, BPF_ALU means BPF_ALU32, but BPF_JMP means
> BPF_JMP64, it is a little confusing at the first glance, add new macro
> BPF_ALU32 and BPF_JMP64, then we can replace the ambiguos macro
> BPF_ALU and BPF_JMP with new macro BPF_ALU32 and BPF_JMP64 step by
> step, BPF_ALU and BPF_JMP can be removed from the uapi header file in
> some day.
> 
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
> ---
>  include/uapi/linux/bpf.h       | 2 ++
>  tools/include/uapi/linux/bpf.h | 2 ++
>  2 files changed, 4 insertions(+)
> 
> diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index
> ba0f0cf..a118c43 100644
> --- a/include/uapi/linux/bpf.h
> +++ b/include/uapi/linux/bpf.h
> @@ -15,6 +15,8 @@
> 
>  /* instruction classes */
>  #define BPF_JMP32	0x06	/* jmp mode in word width */
> +#define BPF_JMP64	0x05	/* jmp mode in double word width */
> +#define BPF_ALU32	0x04	/* alu mode in word width */
>  #define BPF_ALU64	0x07	/* alu mode in double word width */
> 
>  /* ld/ldx fields */
> diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
> index 7f024ac..014b449 100644
> --- a/tools/include/uapi/linux/bpf.h
> +++ b/tools/include/uapi/linux/bpf.h
> @@ -15,6 +15,8 @@
> 
>  /* instruction classes */
>  #define BPF_JMP32	0x06	/* jmp mode in word width */
> +#define BPF_JMP64	0x05	/* jmp mode in double word width */
> +#define BPF_ALU32	0x04	/* alu mode in word width */
>  #define BPF_ALU64	0x07	/* alu mode in double word width */
> 
>  /* ld/ldx fields */
> --
> 2.1.0