On 2020/5/6 下午5:46, Michael S. Tsirkin wrote:

quoted

quoted

There
are a lot of unanswered questions on how this will be implemented.
Thus, I cannot layout how we are going to leverage this info yet, but
your patch are killing this info, which IHMO is going in the wrong
direction.

I can copy vnet header ahead of data_hard_start, does it work for you?

Thanks

That's likely to be somewhat expensive.

Any better approach? Note that it's not the issue that is introduced in 
this patch. Anyhow the header adjustment may just overwrite the vnet 
header even without this patch.

Thanks