[ofa-general] OFED-1.3beta IPoIB testing questions

[Shirley Ma]

I just touch tested ofed-1.3 beta IPoIB. And found there was a kernel 
parameter hw_csum being added in IPoIB. I have several questions here:
1. Why not using ethtool to set up these HW_CSUM flags?
2. I haven't looked at the detailed code yet, is that possible with this 
flag, TCP/IP will not do CSUM for HCA which has no TCP/IP offload support? 
If so, then these packets should be limited to be IB network. Routing to 
ethernet network, the packets would be dropped. If not, I tested IPoIB-UD, 
why I saw 30% improvement with hw_csum set in none connectX mthca SDR 
environment?
3. I saw switching between IPoIB-cm and IPoIB-ud corrupted interface IP 
address (unicast address, subnet mask, broadcast address. Anybody saw the 
same problem?

Thanks
Shirley