crypto: sha-mb - multibuffer crypto infrastructure

This patch introduces the multi-buffer crypto daemon which is responsible
for submitting crypto jobs in a work queue to the responsible multi-buffer
crypto algorithm.  The idea of the multi-buffer algorihtm is to put
data streams from multiple jobs in a wide (AVX2) register and then
take advantage of SIMD instructions to do crypto computation on several
buffers simultaneously.

The multi-buffer crypto daemon is also responsbile for flushing the
remaining buffers to complete the computation if no new buffers arrive
for a while.

Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 30 insertions, 0 deletions

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 00b5906f57b7..86dc81f80bc5 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -158,6 +158,20 @@ config CRYPTO_CRYPTD
           converts an arbitrary synchronous software crypto algorithm
           into an asynchronous algorithm that executes in a kernel thread.
 
+config CRYPTO_MCRYPTD
+        tristate "Software async multi-buffer crypto daemon"
+        select CRYPTO_BLKCIPHER
+        select CRYPTO_HASH
+        select CRYPTO_MANAGER
+        select CRYPTO_WORKQUEUE
+        help
+          This is a generic software asynchronous crypto daemon that
+          provides the kernel thread to assist multi-buffer crypto
+          algorithms for submitting jobs and flushing jobs in multi-buffer
+          crypto algorithms.  Multi-buffer crypto algorithms are executed
+          in the context of this kernel thread and drivers can post
+          their crypto request asyncrhously and process by this daemon.
+
 config CRYPTO_AUTHENC
         tristate "Authenc support"
         select CRYPTO_AEAD
@@ -559,6 +573,22 @@ config CRYPTO_SHA1_PPC
           This is the powerpc hardware accelerated implementation of the
           SHA-1 secure hash standard (FIPS 180-1/DFIPS 180-2).
 
+config CRYPTO_SHA1_MB
+        tristate "SHA1 digest algorithm (x86_64 Multi-Buffer, Experimental)"
+        depends on X86 && 64BIT
+        select CRYPTO_SHA1
+        select CRYPTO_HASH
+        select CRYPTO_MCRYPTD
+        help
+          SHA-1 secure hash standard (FIPS 180-1/DFIPS 180-2) implemented
+          using multi-buffer technique.  This algorithm computes on
+          multiple data lanes concurrently with SIMD instructions for
+          better throughput.  It should not be enabled by default but
+          used when there is significant amount of work to keep the keep
+          the data lanes filled to get performance benefit.  If the data
+          lanes remain unfilled, a flush operation will be initiated to
+          process the crypto jobs, adding a slight latency.
+
 config CRYPTO_SHA256
         tristate "SHA224 and SHA256 digest algorithm"
         select CRYPTO_HASH