[ofw] RE: ipoib connected mode implementation details for consideration.

[Alex Estrin]

Hi Tzachi,

> 
> >    -Connected Mode is forced to stay disabled if LSO is enabled 
> >    ( not sure how to make it work together since LSO is 
> tied to UD ). 
> 
> I'm not sure that I understand your problem here:
> An LSO packet is simply a big packet that the hw should send using
> smaller packets.
> 
> Assuming that you have a cm connection between the two endpoints, is
> there any reason not to send this packets using CM?
>
> One possibale reason that I can see is checksum: For LSO 
> packets windows
> will not calculate the regular checksum but rather do some calculation
> of the pseudo header checksum. But I guess that this is part of the
> problems that we have with checksum and connected mode in any case.

Yes, the major reason is Send IP and TCP ChkSums offloaded to UD only.

Thanks,
Alex. 

> Thanks
> Tzachi
>