[PATCH 1/1] nvme: introduce nvme_transport_sgl_desc structure

[Sagi Grimberg]

>> Currently the tcp and fc transports use nvme_sgl_desc structure to
>> describe transport data blocks. Replace it with a new structure that
>> describes the Transport SGL Data Block according to the NVMe
>> specification.
> 
> What is the point?

I think its ok to be more aligned to the spec, and have the transport
sgl represented in the code. Don't see any harm in that.

> Note that we should probably still clear the reserved space anyway.

Definitely we should clear it.