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Date:   Thu, 25 Feb 2021 01:46:26 +0100
From:   Daniel Borkmann <>
To:     Alexander Lobakin <>,
        Magnus Karlsson <>
Cc:     "Michael S. Tsirkin" <>,
        Jason Wang <>,
        "David S. Miller" <>,
        Jakub Kicinski <>,
        Jonathan Lemon <>,
        Alexei Starovoitov <>,
        Björn Töpel <>,
        Jesper Dangaard Brouer <>,
        John Fastabend <>,
        Andrii Nakryiko <>,
        Martin KaFai Lau <>,
        Song Liu <>, Yonghong Song <>,
        KP Singh <>, Paolo Abeni <>,
        Eric Dumazet <>,
        Xuan Zhuo <>,
        Dust Li <>,,,,
Subject: Re: [PATCH v8 bpf-next 0/5] xsk: build skb by page (aka generic
 zerocopy xmit)

On 2/18/21 9:49 PM, Alexander Lobakin wrote:
> This series introduces XSK generic zerocopy xmit by adding XSK umem
> pages as skb frags instead of copying data to linear space.
> The only requirement for this for drivers is to be able to xmit skbs
> with skb_headlen(skb) == 0, i.e. all data including hard headers
> starts from frag 0.
> To indicate whether a particular driver supports this, a new netdev
> priv flag, IFF_TX_SKB_NO_LINEAR, is added (and declared in virtio_net
> as it's already capable of doing it). So consider implementing this
> in your drivers to greatly speed-up generic XSK xmit.

Applied, thanks!

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