nvmet-rdma: add metadata/T10-PI support
For capable HCAs (e.g. ConnectX-5/ConnectX-6) this will allow end-to-end protection information passthrough and validation for NVMe over RDMA transport. Metadata support was implemented over the new RDMA signature verbs API. Signed-off-by:Israel Rukshin <israelr@mellanox.com> Signed-off-by:
Max Gurtovoy <maxg@mellanox.com> Signed-off-by:
Christoph Hellwig <hch@lst.de>
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