linux-kernel - [PATCH 0/4] Optimize dm-verity using 2-way interleaved SHA-256 hashing

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Message-ID: <20251014211657.113603-1-ebiggers@kernel.org>
Date: Tue, 14 Oct 2025 14:16:53 -0700
From: Eric Biggers <ebiggers@...nel.org>
To: dm-devel@...ts.linux.dev,
	Alasdair Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...nel.org>,
	Mikulas Patocka <mpatocka@...hat.com>
Cc: linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Eric Biggers <ebiggers@...nel.org>
Subject: [PATCH 0/4] Optimize dm-verity using 2-way interleaved SHA-256 hashing

This series makes dm-verity take advantage of the 2-way interleaved
SHA-256 hashing code that was added in 6.18.  fsverity already does
this; this brings the same optimization to dm-verity.  This increases
SHA-256 hashing throughput by up to 98% on x86_64 and 70% on arm64.

To make this possible, this series makes dm-verity use the SHA-256
library when the hash algorithm is SHA-256 (which it usually is).  That
actually provides a ~2% performance improvement by itself, in addition
to the larger improvement from interleaved hashing on x86_64 and arm64.

As usual, I verified that 'verity-compat-test' still passes.

This series is targeting linux-dm/for-next.

Eric Biggers (4):
  dm-verity: remove log message with shash driver name
  dm-verity: use SHA-256 library for SHA-256
  dm-verity: reduce scope of real and wanted digests
  dm-verity: use 2-way interleaved SHA-256 hashing when supported

 drivers/md/Kconfig            |   1 +
 drivers/md/dm-verity-fec.c    |  21 ++--
 drivers/md/dm-verity-fec.h    |   5 +-
 drivers/md/dm-verity-target.c | 203 +++++++++++++++++++++++++---------
 drivers/md/dm-verity.h        |  52 +++++----
 5 files changed, 196 insertions(+), 86 deletions(-)

base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787
-- 
2.51.0