[ofa-general] Zero byte rdma read causes REM_OP_ERROR

[Rajouri Jammu]

I suspect that's the problem as I'm simply setting sge.length to rdma read
size. Thanks for catching it!


On Jan 28, 2008 5:14 AM, Jack Morgenstein <jackm at dev.mellanox.co.il> wrote:

> On Sunday 27 January 2008 15:06, Dotan Barak wrote:
> > Rajouri Jammu wrote:
> > > I'm using rdma_cm and I don't set the qp_access_flags explicitly.
> > >
> > > I presume they are set correctly since non-zero length rdma reads
> > > complete successfully. I have also verified the data.
> > >
> > > the only place I set the privileges is when registering the memory
> > > region and I have them set at
> > > IBV_ACCESS_LOCAL_WRITE, _REMOTE_READ and _REMOTE_WRITE
>
> To send perform a zero-byte RDMA-read/write, you should assemble a WQE
> with
> no scatter/gather entries (see IBSPEC 1.2, volume 1, section 11.4.1.1,
> table 94 -- Work Request Modifier Matrix, footnote b).  A s/g entry with
> its length
> field = 0 is interpreted as requesting 2 gigabytes.
>
> Is this the problem?
>
> - Jack
>
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