[Stgt-devel] Question for pass-through target design

Vladislav Bolkhovitin vst
Mon May 7 16:26:47 CEST 2007


I'm not familiar at all with SRP and VSCSI (never tried them or seen the
hardware), so I could easily confuse them, but I think I should point
you at
http://lists.openfabrics.org/pipermail/iwg/2007-March/000378.html. This
is SCSI RDMA Protocol (SRP) Target driver for Linux. It works over SCST,
so it should support pass-through.


Robert Jennings wrote:
> It looks like the pass-through target support is currently broken, at
> least as I've checked for ibmvstgt, but I think it's a general problem.
> I wanted to check my assumptions and get ideas.
> The code isn't allocating any memory to pass along to the sg code to store
> the result of a read or data for a write.  Currently, dxferp for sg_io_hdr
> or dout_xferp/din_xferp for sg_io_v4 are assigned to the value of uaddr,
> which is set to 0 in kern_queue_cmd.  With the pointer set to NULL,
> the pass-through target isn't going to function.  Even if we had memory
> allocated, there isn't a means of getting data to be written via sg down
> this code path.
> What ideas are there as to how the data will get to user-space so that
> we can use sg?
> Regards,
> Robert Jennings
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