Re: [RFC PATCH net 2/3] virtio-net: allow usage of vrings smaller than MAX_SKB_FRAGS + 2

[Alvaro Karsz]

> First up to 4k should not be a problem. Even jumbo frames e.g. 9k
> is highly likely to succeed. And a probe time which is often boot
> even 64k isn't a problem ...
> 
> Hmm. We could allocate large buffers at probe time. Reuse them and
> copy data over.
> 
> IOW reusing  GOOD_COPY_LEN flow for this case.  Not yet sure how I feel
> about this. OTOH it removes the need for the whole feature blocking
> approach, does it not?
> WDYT?
> 

It could work..

In order to remove completely the feature blocking approach, we'll need to let the control commands fail (as you mentioned in the other patch).
I'm not sure I like it, it means many warnings from virtnet..
And it means accepting features that we know for sure that are not going to work.