netdev - Re: [PATCH bpf-next v3 1/3] xsk: Support UMEM chunk_size > PAGE

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Message-ID: <87sfdckgaa.fsf@toke.dk>
Date:   Thu, 06 Apr 2023 20:38:05 +0200
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Kal Conley <kal.conley@...tris.com>,
        Björn Töpel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>
Cc:     Kal Conley <kal.conley@...tris.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 1/3] xsk: Support UMEM chunk_size > PAGE_SIZE

Kal Conley <kal.conley@...tris.com> writes:

> Add core AF_XDP support for chunk sizes larger than PAGE_SIZE. This
> enables sending/receiving jumbo ethernet frames up to the theoretical
> maxiumum of 64 KiB. For chunk sizes > PAGE_SIZE, the UMEM is required
> to consist of HugeTLB VMAs (and be hugepage aligned). Initially, only
> SKB mode is usable pending future driver work.

Hmm, interesting. So how does this interact with XDP multibuf?

-Toke