On 2025/01/10 19:23, Michael S. Tsirkin wrote:

On Fri, Jan 10, 2025 at 11:27:13AM +0800, Jason Wang wrote:

quoted

On Thu, Jan 9, 2025 at 2:59 PM Akihiko Odaki [off-list ref] wrote:

quoted

The specification says the device MUST set num_buffers to 1 if
VIRTIO_NET_F_MRG_RXBUF has not been negotiated.

Have we agreed on how to fix the spec or not?

As I replied in the spec patch, if we just remove this "MUST", it
looks like we are all fine?

Thanks

We should replace MUST with SHOULD but it is not all fine,
ignoring SHOULD is a quality of implementation issue.

Should we really replace it? It would mean that a driver conformant with 
the current specification may not be compatible with a device conformant 
with the future specification.

We are going to fix all implementations known to buggy (QEMU and Linux) 
anyway so I think it's just fine to leave that part of specification as is.