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

[Heng Qi <hengqi@linux.alibaba.com>]

在 2023/9/4 下午6:26, Parav Pandit 写道:
>> From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
>> Sent: Monday, September 4, 2023 2:23 PM
>
>>> "The device MUST NOT pass received packets that exceed mtu (plus low
>>> level ethernet header length) size with gso_type NONE or ECN after
>> VIRTIO_NET_F_MTU has been successfully negotiated."
>>
>> NO.
>>
>> If the mtu is 1500, we can pass 64k packets to the driver with gso_type (not
>> NONE).
> Any supporting citation to spec for above comment?

I think it can be referred here:
"The converse features are also available: a driver can save the virtual 
device some work by negotiating these features. Note: For example, a 
network packet transported between two guests on the same system might 
not need checksumming at all, nor segmentation, if both guests are 
amenable."

>
> Each packet must be 1500 for the mtu normative above.
> gso_size to <= mtu (ingoring the hdr math for simplicity for now).
> whole GSO completion can be for 64K to be reported in used_elem.len.
>
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