netdev - Re: [PATCH v15 bpf-next 00/18] mvneta: introduce XDP multi-buffer support

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Date:   Sat, 09 Oct 2021 15:00:51 +0200
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        lorenzo.bianconi@...hat.com, davem@...emloft.net, ast@...nel.org,
        daniel@...earbox.net, shayagr@...zon.com, john.fastabend@...il.com,
        dsahern@...nel.org, brouer@...hat.com, echaudro@...hat.com,
        jasowang@...hat.com, alexander.duyck@...il.com, saeed@...nel.org,
        maciej.fijalkowski@...el.com, magnus.karlsson@...el.com,
        tirthendu.sarkar@...el.com
Subject: Re: [PATCH v15 bpf-next 00/18] mvneta: introduce XDP multi-buffer
 support

Jakub Kicinski <kuba@...nel.org> writes:

> On Fri,  8 Oct 2021 14:49:38 +0200 Lorenzo Bianconi wrote:
>> Changes since v14:
>> - intrudce bpf_xdp_pointer utility routine and
>>   bpf_xdp_load_bytes/bpf_xdp_store_bytes helpers
>> - drop bpf_xdp_adjust_data helper
>> - drop xdp_frags_truesize in skb_shared_info
>> - explode bpf_xdp_mb_adjust_tail in bpf_xdp_mb_increase_tail and
>>   bpf_xdp_mb_shrink_tail
>
> I thought the conclusion of the discussion regarding backward
> compatibility was that we should require different program type
> or other explicit opt in. Did I misinterpret?

No, you're right. I think we settled on using the 'flags' field instead
of program type, but either way this should be part of the initial patch
set.

-Toke