1 files changed, 157 insertions, 0 deletions
diff --git a/arch/x86/crypto/nh-avx2-x86_64.S b/arch/x86/crypto/nh-avx2-x86_64.S
new file mode 100644
index 000000000000..f7946ea1b704
--- /dev/null
+++ b/arch/x86/crypto/nh-avx2-x86_64.S
@@ -0,0 +1,157 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * NH - ε-almost-universal hash function, x86_64 AVX2 accelerated
+ *
+ * Copyright 2018 Google LLC
+ *
+ * Author: Eric Biggers <ebiggers@google.com>
+ */
+
+#include <linux/linkage.h>
+
+#define		PASS0_SUMS	%ymm0
+#define		PASS1_SUMS	%ymm1
+#define		PASS2_SUMS	%ymm2
+#define		PASS3_SUMS	%ymm3
+#define		K0		%ymm4
+#define		K0_XMM		%xmm4
+#define		K1		%ymm5
+#define		K1_XMM		%xmm5
+#define		K2		%ymm6
+#define		K2_XMM		%xmm6
+#define		K3		%ymm7
+#define		K3_XMM		%xmm7
+#define		T0		%ymm8
+#define		T1		%ymm9
+#define		T2		%ymm10
+#define		T2_XMM		%xmm10
+#define		T3		%ymm11
+#define		T3_XMM		%xmm11
+#define		T4		%ymm12
+#define		T5		%ymm13
+#define		T6		%ymm14
+#define		T7		%ymm15
+#define		KEY		%rdi
+#define		MESSAGE		%rsi
+#define		MESSAGE_LEN	%rdx
+#define		HASH		%rcx
+
+.macro _nh_2xstride	k0, k1, k2, k3
+
+	// Add message words to key words
+	vpaddd		\k0, T3, T0
+	vpaddd		\k1, T3, T1
+	vpaddd		\k2, T3, T2
+	vpaddd		\k3, T3, T3
+
+	// Multiply 32x32 => 64 and accumulate
+	vpshufd		$0x10, T0, T4
+	vpshufd		$0x32, T0, T0
+	vpshufd		$0x10, T1, T5
+	vpshufd		$0x32, T1, T1
+	vpshufd		$0x10, T2, T6
+	vpshufd		$0x32, T2, T2
+	vpshufd		$0x10, T3, T7
+	vpshufd		$0x32, T3, T3
+	vpmuludq	T4, T0, T0
+	vpmuludq	T5, T1, T1
+	vpmuludq	T6, T2, T2
+	vpmuludq	T7, T3, T3
+	vpaddq		T0, PASS0_SUMS, PASS0_SUMS
+	vpaddq		T1, PASS1_SUMS, PASS1_SUMS
+	vpaddq		T2, PASS2_SUMS, PASS2_SUMS
+	vpaddq		T3, PASS3_SUMS, PASS3_SUMS
+.endm
+
+/*
+ * void nh_avx2(const u32 *key, const u8 *message, size_t message_len,
+ *		u8 hash[NH_HASH_BYTES])
+ *
+ * It's guaranteed that message_len % 16 == 0.
+ */
+ENTRY(nh_avx2)
+
+	vmovdqu		0x00(KEY), K0
+	vmovdqu		0x10(KEY), K1
+	add		$0x20, KEY
+	vpxor		PASS0_SUMS, PASS0_SUMS, PASS0_SUMS
+	vpxor		PASS1_SUMS, PASS1_SUMS, PASS1_SUMS
+	vpxor		PASS2_SUMS, PASS2_SUMS, PASS2_SUMS
+	vpxor		PASS3_SUMS, PASS3_SUMS, PASS3_SUMS
+
+	sub		$0x40, MESSAGE_LEN
+	jl		.Lloop4_done
+.Lloop4:
+	vmovdqu		(MESSAGE), T3
+	vmovdqu		0x00(KEY), K2
+	vmovdqu		0x10(KEY), K3
+	_nh_2xstride	K0, K1, K2, K3
+
+	vmovdqu		0x20(MESSAGE), T3
+	vmovdqu		0x20(KEY), K0
+	vmovdqu		0x30(KEY), K1
+	_nh_2xstride	K2, K3, K0, K1
+
+	add		$0x40, MESSAGE
+	add		$0x40, KEY
+	sub		$0x40, MESSAGE_LEN
+	jge		.Lloop4
+
+.Lloop4_done:
+	and		$0x3f, MESSAGE_LEN
+	jz		.Ldone
+
+	cmp		$0x20, MESSAGE_LEN
+	jl		.Llast
+
+	// 2 or 3 strides remain; do 2 more.
+	vmovdqu		(MESSAGE), T3
+	vmovdqu		0x00(KEY), K2
+	vmovdqu		0x10(KEY), K3
+	_nh_2xstride	K0, K1, K2, K3
+	add		$0x20, MESSAGE
+	add		$0x20, KEY
+	sub		$0x20, MESSAGE_LEN
+	jz		.Ldone
+	vmovdqa		K2, K0
+	vmovdqa		K3, K1
+.Llast:
+	// Last stride.  Zero the high 128 bits of the message and keys so they
+	// don't affect the result when processing them like 2 strides.
+	vmovdqu		(MESSAGE), T3_XMM
+	vmovdqa		K0_XMM, K0_XMM
+	vmovdqa		K1_XMM, K1_XMM
+	vmovdqu		0x00(KEY), K2_XMM
+	vmovdqu		0x10(KEY), K3_XMM
+	_nh_2xstride	K0, K1, K2, K3
+
+.Ldone:
+	// Sum the accumulators for each pass, then store the sums to 'hash'
+
+	// PASS0_SUMS is (0A 0B 0C 0D)
+	// PASS1_SUMS is (1A 1B 1C 1D)
+	// PASS2_SUMS is (2A 2B 2C 2D)
+	// PASS3_SUMS is (3A 3B 3C 3D)
+	// We need the horizontal sums:
+	//     (0A + 0B + 0C + 0D,
+	//	1A + 1B + 1C + 1D,
+	//	2A + 2B + 2C + 2D,
+	//	3A + 3B + 3C + 3D)
+	//
+
+	vpunpcklqdq	PASS1_SUMS, PASS0_SUMS, T0	// T0 = (0A 1A 0C 1C)
+	vpunpckhqdq	PASS1_SUMS, PASS0_SUMS, T1	// T1 = (0B 1B 0D 1D)
+	vpunpcklqdq	PASS3_SUMS, PASS2_SUMS, T2	// T2 = (2A 3A 2C 3C)
+	vpunpckhqdq	PASS3_SUMS, PASS2_SUMS, T3	// T3 = (2B 3B 2D 3D)
+
+	vinserti128	$0x1, T2_XMM, T0, T4		// T4 = (0A 1A 2A 3A)
+	vinserti128	$0x1, T3_XMM, T1, T5		// T5 = (0B 1B 2B 3B)
+	vperm2i128	$0x31, T2, T0, T0		// T0 = (0C 1C 2C 3C)
+	vperm2i128	$0x31, T3, T1, T1		// T1 = (0D 1D 2D 3D)
+
+	vpaddq		T5, T4, T4
+	vpaddq		T1, T0, T0
+	vpaddq		T4, T0, T0
+	vmovdqu		T0, (HASH)
+	ret
+ENDPROC(nh_avx2)