[0/2,v3] dm-crypt support for per-sector NVMe metadata

Message

Mikulas Patocka May 23, 2024, 4:53 p.m. UTC

Hi

Here I'm resending the dm-crypt support for per-sector NVMe metadata. I 
made some changes to the first patch as suggested by Jens Axboe.

The first patch fixes a bug when splitting a bio with attached metadata.
The second patch enables dm-crypt to use NVMe metadata for authenticated 
encryption. dm-crypt can run directly on NVMe without using dm-integrity.

These patches increase write throughput twice, because there is no write 
to the dm-integrity journal.

An example how to use it (so far, there is no support in the userspace
cryptsetup tool):

# nvme format /dev/nvme1 -n 1 -lbaf=4
# dmsetup create cr --table '0 1048576 crypt
capi:authenc(hmac(sha256),cbc(aes))-essiv:sha256
01b11af6b55f76424fd53fb66667c301466b2eeaf0f39fd36d26e7fc4f52ade2de4228e996f5ae2fe817ce178e77079d28e4baaebffbcd3e16ae4f36ef217298
0 /dev/nvme1n1 0 2 integrity:32:aead sector_size:4096'

Mikulas