Hi, Ali!
I was also try Direct through attach configuration but fail.
When I was enabled Intel VT-d on my X8DTN+-FLR then vSphere unable recognize MHQH19-XTC.
But another MHQH29B-XTR was always ok!
Big problem is windows vm with QDR HCA (via Intel vt-d) was always BSOD and reboot continuously forever.
QDR HCA's firmware was 2.9.100 or 2.9.1200 (if available)
vSphere 5.1 update 1
VM hardware 9
I was read all aspects about vRDMA last years.
I think vRDMA is best choice and you'll be co work VMware...:)
SRP is very powerful protocol but have many problem for
extreme solid storage.
iSER is better choice for virtualized environment.
I was test SMB 3.0 on my personal lab with Windows server 2012. Performance was good but not a SAN feature and not a standard. That's a very funny for me....:)
Anyway....
I was drop SRP, IPoIB, Direct path-through with Intel VT-D.
If there is a vRDMA experimental project...
Do you have official plan?
It means co work with VMware that add a new vRDMA feature in ESXi hypervisor.