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Date:   Mon, 2 Dec 2019 10:45:39 +0800
From:   Jason Wang <>
To:     David Ahern <>,
        Prashant Bhole <>,
        "David S . Miller" <>,
        "Michael S . Tsirkin" <>
Cc:     Alexei Starovoitov <>,
        Daniel Borkmann <>,
        Jakub Kicinski <>,
        Jesper Dangaard Brouer <>,
        John Fastabend <>,
        Martin KaFai Lau <>,
        Song Liu <>, Yonghong Song <>,
        Andrii Nakryiko <>,,,
Subject: Re: [RFC net-next 08/18] tun: run offloaded XDP program in Tx path

On 2019/12/2 上午12:39, David Ahern wrote:
> On 11/26/19 4:07 AM, Prashant Bhole wrote:
>> run offloaded XDP program as soon as packet is removed from the ptr
>> ring. Since this is XDP in Tx path, the traditional handling of
>> XDP actions XDP_TX/REDIRECT isn't valid. For this reason we call
>> do_xdp_generic_core instead of do_xdp_generic. do_xdp_generic_core
>> just runs the program and leaves the action handling to us.
> What happens if an offloaded program returns XDP_REDIRECT?
> Below you just drop the packet which is going to be a bad user
> experience. A better user experience is to detect XDP return codes a
> program uses, catch those that are not supported for this use case and
> fail the install of the program.

Yes, this could be done in the guest.


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