[PATCH 2/6] crypto: sha512-mb - Enable SHA512 multibuffer support

[megha . dey]

From: Megha Dey <megha.dey@xxxxxxxxxxxxxxx>

Add the config CRYPTO_SHA512_MB which will enable the computation
using the SHA512 multi-buffer algorithm.

Signed-off-by: Megha Dey <megha.dey@xxxxxxxxxxxxxxx>
Reviewed-by: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Reviewed-by: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
---
 crypto/Kconfig | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 3c763d8..02fce62 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -694,6 +694,22 @@ config CRYPTO_SHA256_MB
 	  lanes remain unfilled, a flush operation will be initiated to
 	  process the crypto jobs, adding a slight latency.
 
+config CRYPTO_SHA512_MB
+        tristate "SHA512 digest algorithm (x86_64 Multi-Buffer, Experimental)"
+        depends on X86 && 64BIT
+        select CRYPTO_SHA512
+        select CRYPTO_HASH
+        select CRYPTO_MCRYPTD
+        help
+          SHA-512 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
-- 
1.9.1