[ewg] Mellanox target workaround in SRP

[David Dillow]

On Mon, 2011-01-10 at 11:58 -0800, Vu Pham wrote:
> David Dillow wrote:
> > either. The SRP FMR mapping code is careful to mask the SG address with
> > the FMR page mask, so we should never ask the HCA to map a page with the
> > first_byte_offset != 0. Instead, we tell the target to request an IO
> > virtual address appropriately offset into the first page of the FMR.
> > 
> > Or perhaps I misunderstood you, and it's the non-zero first byte offset
> > in the RDMA command on the wire that is the issue, and not the FMR setup
> > in the initiator? And it only affects FMR-mapped memory, not the
> > kernel's MR?
> 
> It's not the kernel's MR.
> 
> I suspect that the corruption happen with *only* Mellanox FMR + MPT
> setup without fbo and target doing RDMA with offset vaddr.
> 
> I need to ask internal hw/fw guys and confirm if it's true.

Have you had any response from the HW/FW guys?

-- 
Dave Dillow
National Center for Computational Science
Oak Ridge National Laboratory
(865) 241-6602 office