netdev - Re: [PATCH] net: tun: fix tun_xdp_one() for IFF

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Message-ID: <649c2d72-68f9-d0a6-10ed-51c45d0dd6be@redhat.com>
Date:   Tue, 22 Jun 2021 12:34:35 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     David Woodhouse <dwmw2@...radead.org>,
        netdev <netdev@...r.kernel.org>
Cc:     Eugenio Pérez <eperezma@...hat.com>
Subject: Re: [PATCH] net: tun: fix tun_xdp_one() for IFF_TUN mode


在 2021/6/21 下午10:50, David Woodhouse 写道:
> On Mon, 2021-06-21 at 11:52 +0100, David Woodhouse wrote:
>> Firstly, I don't think I can set IFF_VNET_HDR on the tun device after
>> opening it. So my model of "open the tun device, then *see* if we can
>> use vhost to accelerate it" doesn't work.
>>
>> I tried setting VHOST_NET_F_VIRTIO_NET_HDR in the vhost features
>> instead, but that gives me a weird failure mode where it drops around
>> half the incoming packets, and I haven't yet worked out why.
> FWIW that problem also goes away if I set TUNSNDBUF and avoid the XDP
> data path.


That looks a workaround.

Thanks