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Re: [RFC net-next 08/18] tun: run offloaded XDP program in Tx path

From: Jason Wang
Subject: Re: [RFC net-next 08/18] tun: run offloaded XDP program in Tx path
Date: Mon, 2 Dec 2019 10:56:00 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0

On 2019/12/2 上午5:54, David Miller wrote:
From: "Michael S. Tsirkin" <address@hidden>
Date: Sun, 1 Dec 2019 16:40:22 -0500

Right. But it is helpful to expose the supported functionality
to guest in some way, if nothing else then so that
guests can be moved between different hosts.

Also, we need a way to report this kind of event to guest
so it's possible to figure out what went wrong.
On the contrary, this is why it is of utmost importance that all
XDP implementations support the full suite of XDP facilities from
the very beginning.

This is why we keep giving people a hard time when they add support
only for some of the XDP return values and semantics.  Users will get
killed by this, and it makes XDP a poor technology to use because
behavior is not consistent across device types.

That's not acceptable and I'll push back on anything that continues
this trend.

If you can't HW offload it, kick it to software.

We can try to work out a solution for XDP_REDIRECT.


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