[PATCHv2 6/7] block: add pi for nvme enhanced integrity

[Martin K. Petersen]

Keith,

This all looks pretty good to me. Only nit I have is:

> +static blk_status_t nvme_pi_type1_verify_crc(struct blk_integrity_iter *iter)
> +{
> +	return nvme_crc64_verify(iter, T10_PI_TYPE1_PROTECTION);
> +}
> +
> +static blk_status_t nvme_pi_type1_generate_crc(struct blk_integrity_iter *iter)
> +{
> +	return nvme_crc64_generate(iter, T10_PI_TYPE1_PROTECTION);
> +}

Since we will definitely need to support the CRC32C variants, the
nvme_pi_type1_ prefix is a bit too generic. Wish we had gone with Type 4
and 5 like I originally proposed in SCSI. Not a big fan of this "almost
exactly like T10 Type 1 except for all these differences" situation that
NVMe ended up with.

Anyway. So I think the NVMe-specific format helpers need to at the very
least capture that they are for the CRC64 case.

Other than that it looks OK.

-- 
Martin K. Petersen	Oracle Linux Engineering