[PATCH 17/17] nvme-rdma: Add T10-PI support

[sagi@grimberg.me (Sagi Grimberg)]

>> 3. ret = ib_mr_setup_pi(struct ib_mr *mr, struct blk_integrity *bi)
>> ??? *although this might not be able to converge scsi and nvme in one
>> ???? shot so we might have each ulp do its own thing here..
> 
> In the first patchset each ULP will fill in the sig_attrs by itself.
> We can add this incrementaly.

OK... I would like to have a lib in place that maps better to
block integrity semantics.

>> 4. ret = ib_post_send(qp, pi_wr)
>> ??? where ib_pi_wr looks exactly like ib_reg_wr but has the opcode
>> ??? dissection for the provider to do all internal stuff.
> 
> did you mean similar to IB_WR_REG_SIG_MR (and not IB_WR_REG_MR) ?
> This IB_WR_REG_PI_MR will need to create internal WR typed IB_WR_REG_MR 
> for the internal mr.

We could even simply use IB_WR_REG_MR, and if the MR has PI set
(previously ib_map_mr_sg_pi was called).

>> 5. ret = ib_check_pi_status(mr)
>>
>> Try to hide all the multiple mr madness...
> 
> I'll create internal mlx5_ib_mr pi_mr for mr typed IB_MR_TYPE_PI.

Cool..