linux-kernel - Re: [PATCH bpf-next v1 2/8] bpf: Propagate BPF_PSEUDO_BTF

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Message-ID: <496a2a25-ad43-2f87-033b-3b462011ad08@fb.com>
Date:   Thu, 20 Aug 2020 09:44:50 -0700
From:   Yonghong Song <yhs@...com>
To:     Hao Luo <haoluo@...gle.com>, <netdev@...r.kernel.org>,
        <bpf@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-kselftest@...r.kernel.org>
CC:     Shuah Khan <shuah@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andriin@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Quentin Monnet <quentin@...valent.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, Andrey Ignatov <rdna@...com>,
        Jakub Sitnicki <jakub@...udflare.com>
Subject: Re: [PATCH bpf-next v1 2/8] bpf: Propagate BPF_PSEUDO_BTF_ID to uapi
 headers in /tools



On 8/19/20 3:40 PM, Hao Luo wrote:
> Propagate BPF_PSEUDO_BTF_ID from include/linux/uapi/bpf.h to
> tools/include/linux/uapi/bpf.h.

This can be folded into the previous patch.

> 
> Signed-off-by: Hao Luo <haoluo@...gle.com>
> ---
>   tools/include/uapi/linux/bpf.h | 38 ++++++++++++++++++++++++++--------
>   1 file changed, 29 insertions(+), 9 deletions(-)
> 
> diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
> index 0480f893facd..468376f2910b 100644
> --- a/tools/include/uapi/linux/bpf.h
> +++ b/tools/include/uapi/linux/bpf.h
> @@ -346,18 +346,38 @@ enum bpf_link_type {
>   #define BPF_F_TEST_STATE_FREQ	(1U << 3)
>   
>   /* When BPF ldimm64's insn[0].src_reg != 0 then this can have
> - * two extensions:
> - *
> - * insn[0].src_reg:  BPF_PSEUDO_MAP_FD   BPF_PSEUDO_MAP_VALUE
> - * insn[0].imm:      map fd              map fd
> - * insn[1].imm:      0                   offset into value
> - * insn[0].off:      0                   0
> - * insn[1].off:      0                   0
> - * ldimm64 rewrite:  address of map      address of map[0]+offset
> - * verifier type:    CONST_PTR_TO_MAP    PTR_TO_MAP_VALUE
> + * the following extensions:
> + *
> + * insn[0].src_reg:  BPF_PSEUDO_MAP_FD
> + * insn[0].imm:      map fd
> + * insn[1].imm:      0
> + * insn[0].off:      0
> + * insn[1].off:      0
> + * ldimm64 rewrite:  address of map
> + * verifier type:    CONST_PTR_TO_MAP
>    */
>   #define BPF_PSEUDO_MAP_FD	1
> +/*
> + * insn[0].src_reg:  BPF_PSEUDO_MAP_VALUE
> + * insn[0].imm:      map fd
> + * insn[1].imm:      offset into value
> + * insn[0].off:      0
> + * insn[1].off:      0
> + * ldimm64 rewrite:  address of map[0]+offset
> + * verifier type:    PTR_TO_MAP_VALUE
> + */
>   #define BPF_PSEUDO_MAP_VALUE	2
> +/*
> + * insn[0].src_reg:  BPF_PSEUDO_BTF_ID
> + * insn[0].imm:      kernel btd id of VAR
> + * insn[1].imm:      0
> + * insn[0].off:      0
> + * insn[1].off:      0
> + * ldimm64 rewrite:  address of the kernel variable
> + * verifier type:    PTR_TO_BTF_ID or PTR_TO_MEM, depending on whether the var
> + *                   is struct/union.
> + */
> +#define BPF_PSEUDO_BTF_ID	3
>   
>   /* when bpf_call->src_reg == BPF_PSEUDO_CALL, bpf_call->imm == pc-relative
>    * offset to another bpf function
>