netdev - Re: [PATCH v21 bpf-next 18/23] libbpf: Add SEC name for xdp

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Date:   Fri, 14 Jan 2022 17:50:23 +0100
From:   Jesper Dangaard Brouer <jbrouer@...hat.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     brouer@...hat.com, Jesper Dangaard Brouer <jbrouer@...hat.com>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Lorenzo Bianconi <lorenzo.bianconi@...hat.com>,
        Zvi Effron <zeffron@...tgames.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Shay Agroskin <shayagr@...zon.com>,
        john fastabend <john.fastabend@...il.com>,
        David Ahern <dsahern@...nel.org>,
        Eelco Chaudron <echaudro@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Saeed Mahameed <saeed@...nel.org>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        tirthendu.sarkar@...el.com
Subject: Re: [PATCH v21 bpf-next 18/23] libbpf: Add SEC name for xdp_mb
 programs



On 14/01/2022 03.09, Alexei Starovoitov wrote:
> On Thu, Jan 13, 2022 at 3:58 PM Lorenzo Bianconi <lorenzo@...nel.org> wrote:
>>>
>>> Btw "xdp_cpumap" should be cleaned up.
>>> xdp_cpumap is an attach type. It's not prog type.
>>> Probably it should be "xdp/cpumap" to align with "cgroup/bind[46]" ?
>>
>> so for xdp "mb" or xdp "frags" it will be xdp/cpumap.mb (xdp/devmap.mb) or
>> xdp/cpumap.frags (xdp/devmap.frags), right?
> 
> xdp.frags/cpumap
> xdp.frags/devmap
> 
> The current de-facto standard for SEC("") in libbpf:
> prog_type.prog_flags/attach_place

Ups, did we make a mistake with SEC("xdp_devmap/")

and can we correct without breaking existing programs?

> "attach_place" is either function_name for fentry/, tp/, lsm/, etc.
> or attach_type/hook/target for cgroup/bind4, cgroup_skb/egress.
> 
> lsm.s/socket_bind -> prog_type = LSM, flags = SLEEPABLE
> lsm/socket_bind -> prog_type = LSM, non sleepable.
>