Re: [Qemu-devel] jumbo frames: needing some help

[Martin Rauh <martin.rauh@uni-ulm.de>]

Anthony Liguori wrote:
> martin.rauh@uni-ulm.de wrote:
>> Hello, everyone!
>>
>> Sorry for the inconvenience, but as a part of my diploma thesis, I am 
>> creating a virtual NIC for QEMU, in order to support a new cluster OS 
>> of the university. (Saving the overhead caused by emulating real 
>> hardware, it is not emulating an existing NIC.) Anyway, now it seems 
>> to be working correctly, except for handling jumbo frames, which I 
>> have to make available.
> 
> You would have to post your patch.  We seem to be able to handle jumbo 
> frames nicely with virtio-net.
> 
> BTW, are you aware of virtio-net?  It has all of the properties that you 
> are describing and it already exists for Linux and Windows.
> 
No, I didn't know about virtio-net. Presumably it would be better to 
support this virtio-net in our OS, but I think there's not enough time 
left to develop a new driver now. I will recommend this for further 
proceeding, thank you for this hint!

http://home.vrweb.de/mrauh/testnic.c
Here is the source file of my virtual NIC, which I modelled on then 
NE2000.c, but it is probably not very nice to read. I used 
qemu_send_packet for sending and registered my testnic_receive function 
via qemu_new_vlan_client. Do you agree in principle to this approach, in 
terms of proceeding jumbo frames?

Thanks!

Martin Rauh.