From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: Sai Aung Hlyan Htet <saiaunghlyanhtet2003@gmail.com>
Cc: bpf@vger.kernel.org, Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
John Fastabend <john.fastabend@gmail.com>,
netdev@vger.kernel.org, Jesper Dangaard Brouer <hawk@kernel.org>,
Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Subject: Re: [bpf-next,v3] bpf: cpumap: report queue_index to xdp_rxq_info
Date: Wed, 14 Jan 2026 12:38:56 +0100 [thread overview]
Message-ID: <87bjiw1l0v.fsf@toke.dk> (raw)
In-Reply-To: <CAGF5Uf48mRAuUZpTAGCGQtveDoDpF_1SKXFoBECqYzU4+dVwwg@mail.gmail.com>
Sai Aung Hlyan Htet <saiaunghlyanhtet2003@gmail.com> writes:
> Sorry. I did not know it as this is my first time contribution, and
> did not check it.
>
> What about introducing a structured metadata extension area between
> xdp_frame and BPF metadata in packet headroom?
>
> Below is the example memory layout:
> Current (after redirect):
> [xdp_frame 32B][BPF metadata][unused headroom][data]→
>
> Proposed:
> [xdp_frame 32B][kernel_metadata 48B][BPF metadata][unused headroom][data]→
>
> But, the problem that comes to my mind while thinking about this
> solution is that
> additional 48 bytes of headroom beyond the 32-byte xdp_frame would be consumed.
> WDYT?
Yeah, this has been discussed as well :)
See:
https://netdevconf.info/0x19/sessions/talk/traits-rich-packet-metadata.html
Which has since evolved a bit to these series:
https://lore.kernel.org/r/20260105-skb-meta-safeproof-netdevs-rx-only-v2-0-a21e679b5afa@cloudflare.com
https://lore.kernel.org/r/20260110-skb-meta-fixup-skb_metadata_set-calls-v1-0-1047878ed1b0@cloudflare.com
(Also, please don't top-post on the mailing lists)
-Toke
next prev parent reply other threads:[~2026-01-14 11:39 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-14 6:04 [bpf-next,v3] bpf: cpumap: report queue_index to xdp_rxq_info saiaunghlyanhtet
2026-01-14 10:53 ` Toke Høiland-Jørgensen
2026-01-14 11:27 ` Sai Aung Hlyan Htet
2026-01-14 11:38 ` Toke Høiland-Jørgensen [this message]
2026-01-14 12:01 ` Sai Aung Hlyan Htet
2026-01-14 12:33 ` Toke Høiland-Jørgensen
2026-01-14 13:11 ` Sai Aung Hlyan Htet
2026-01-14 13:30 ` Jesper Dangaard Brouer
2026-01-14 14:18 ` Sai Aung Hlyan Htet
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