[LU-1201] Lustre crypto hash cleanup

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.3.0
• Assignee: WC Triage
• Reporter: Alexander Boyko

Description

Lustre use crypto hashes algo in two ways: PTLRPC (ptlrpc/sec_bulk.c), OST(ost/ost_handler.c)/OSC (osc/osc_request.c).
OST,OSC use crc32, crc32c, adler for checksumming (compute_checksum() function)
PTLRPC uses crc32, adler, md5, sha1-512 ( kernel crypto api for all, excluding crc32 adler)
All subsystems go through bulk pages and update checksum.
To resolve conflicts with different implementation of checksumming, a new crypto hash interface is needed at libcfs. It should use kernel crypto api for hash calculation for kernel modules, and lustre implementation for user mode. Previus checksum calculation should be changed to the new libcfs crypto hash api. And adding new hash algo would be a simple task.

Issue Links

• is related to: LU-744 Single client's performance degradation on 2.1