netdev - Re: [PATCH v14 bpf-next 00/18] mvneta: introduce XDP multi-buffer support

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Message-ID: <YV2TSyQWBQWtQEEw@lore-desk>
Date:   Wed, 6 Oct 2021 14:15:07 +0200
From:   Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
To:     Eelco Chaudron <echaudro@...hat.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Lorenz Bauer <lmb@...udflare.com>, bpf <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, shayagr@...zon.com,
        John Fastabend <john.fastabend@...il.com>,
        David Ahern <dsahern@...nel.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Saeed Mahameed <saeed@...nel.org>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        tirthendu.sarkar@...el.com
Subject: Re: [PATCH v14 bpf-next 00/18] mvneta: introduce XDP multi-buffer
 support

> 
> 
> On 6 Oct 2021, at 11:32, Lorenzo Bianconi wrote:
> 
> >> On Fri, 1 Oct 2021 11:03:58 +0200 Lorenzo Bianconi wrote:
> >>> Can you please check if the code above is aligned to current requirements or if
> >>> it is missing something?
> >>> If this code it is fine, I guess we have two option here:
> >>> - integrate the commits above in xdp multi-buff series (posting v15) and work on
> >>>   the verfier code in parallel (if xdp_mb_pointer helper is not required from day0)
> >>> - integrate verfier changes in xdp multi-buff series, drop bpf_xdp_load_bytes
> >>>   helper (probably we will still need bpf_xdp_store_bytes) and introduce
> >>>   bpf_xdp_pointer as new ebpf helper.
> >>
> >> It wasn't clear to me that we wanted bpf_xdp_load_bytes() to exist.
> >> But FWIW no preference here.
> >>
> >
> > ack, same here. Any other opinion about it?
> 
> I was under the impression getting a pointer might be enough. But playing with the bpf ring buffers for a bit, it still might be handy to extract some data to be sent to userspace. So I would not mind keeping it.
> 

ok, so it seems we have a use-case for bpf_xdp_load_bytes(). If everybody
agree, I will post v15 with them included and we then we can work in parallel
for a bpf_xdp_pointer ebpf helper.

Regards,
Lorenzo


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