RE: RE: [virtio-dev] RE: RE: RE: RE: [PATCH v16] virtio-net: support device stats

[Parav Pandit <parav@nvidia.com>]

> From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
> Sent: Tuesday, September 5, 2023 8:26 AM

> > Sure, it can avoid segmentation, but not at the cost of skipping mtu check.
> > For example, sender sends skb with gso with each segment of 9K, and receiver
> has mtu of 1500, same skb without segmentation is not good.
> > Because gso_size should be same as 1500 to match the mtu.
> 
> First, for me, I think the size of the each buffer specified by the desc is irrelated
> to the gso_size.
> 
> And the receiver can set the gso_size to match the MTU.
> 
> So the sender can send a gso packet with any segments, any gso_size.
> For the receiver, it receives a big packet, it copys to the driver with multple
> buffers, and sets the right gso_size.
> 
> Is that right?

Right.
By definition of GSO it is segmented.
Soi counters should be for the segmented.
And for special case of "Note", there should be separate counter to indicate GSO was requested_but_not_done.