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ICP: gcm-avx: Support architectures lacking the MOVBE instruction

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There are a couple of x86_64 architectures which support all needed
features to make the accelerated GCM implementation work but the
MOVBE instruction. Those are mainly Intel Sandy- and Ivy-Bridge
and AMD Bulldozer, Piledriver, and Steamroller.

By using MOVBE only if available and replacing it with a MOV
followed by a BSWAP if not, those architectures now benefit from
the new GCM routines and performance is considerably better
compared to the original implementation.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Adam D. Moss <c@yotes.com>
Signed-off-by: Attila Fülöp <attila@fueloep.org>
Followup #9749 
Closes #10029
This commit is contained in:
Attila Fülöp
2020-03-17 18:24:38 +01:00
committed by GitHub
parent a57d3d45d6
commit 5b3b79559c
3 changed files with 389 additions and 18 deletions
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module/icp/include/modes/modes.h
+2 -1
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@@ -40,8 +40,9 @@ extern "C" {
* anyhow.
*/
#if defined(__x86_64__) && defined(HAVE_AVX) && \
defined(HAVE_AES) && defined(HAVE_PCLMULQDQ) && defined(HAVE_MOVBE)
defined(HAVE_AES) && defined(HAVE_PCLMULQDQ)
#define CAN_USE_GCM_ASM
extern boolean_t gcm_avx_can_use_movbe;
#endif
#define ECB_MODE 0x00000002