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[src/trunk]: src/sys/crypto/aes/arch/x86 VIA AES: Batch AES-XTS computation i...



details:   https://anonhg.NetBSD.org/src/rev/4461fa99797a
branches:  trunk
changeset: 935313:4461fa99797a
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Mon Jun 29 23:41:35 2020 +0000

description:
VIA AES: Batch AES-XTS computation into eight blocks at a time.

Experimental -- performance improvement is not clearly worth the
complexity.

diffstat:

 sys/crypto/aes/arch/x86/aes_via.c |  118 ++++++++++++++++++++++++++-----------
 1 files changed, 82 insertions(+), 36 deletions(-)

diffs (284 lines):

diff -r 3f1fe23aef5f -r 4461fa99797a sys/crypto/aes/arch/x86/aes_via.c
--- a/sys/crypto/aes/arch/x86/aes_via.c Mon Jun 29 23:40:28 2020 +0000
+++ b/sys/crypto/aes/arch/x86/aes_via.c Mon Jun 29 23:41:35 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: aes_via.c,v 1.1 2020/06/29 23:39:30 riastradh Exp $    */
+/*     $NetBSD: aes_via.c,v 1.2 2020/06/29 23:41:35 riastradh Exp $    */
 
 /*-
  * Copyright (c) 2020 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(1, "$NetBSD: aes_via.c,v 1.1 2020/06/29 23:39:30 riastradh Exp $");
+__KERNEL_RCSID(1, "$NetBSD: aes_via.c,v 1.2 2020/06/29 23:41:35 riastradh Exp $");
 
 #include <sys/types.h>
 #include <sys/evcnt.h>
@@ -119,8 +119,8 @@
 }
 
 static inline void
-aesvia_enc1(const struct aesenc *enc, const uint8_t in[static 16],
-    uint8_t out[static 16], uint32_t cw0)
+aesvia_encN(const struct aesenc *enc, const uint8_t in[static 16],
+    uint8_t out[static 16], size_t nblocks, uint32_t cw0)
 {
        const uint32_t cw[4] __aligned(16) = {
                [0] = (cw0
@@ -128,7 +128,6 @@
                    | C3_CRYPT_CWLO_ENCRYPT
                    | C3_CRYPT_CWLO_NORMAL),
        };
-       size_t nblocks = 1;
 
        KASSERT(((uintptr_t)enc & 0xf) == 0);
        KASSERT(((uintptr_t)in & 0xf) == 0);
@@ -141,8 +140,8 @@
 }
 
 static inline void
-aesvia_dec1(const struct aesdec *dec, const uint8_t in[static 16],
-    uint8_t out[static 16], uint32_t cw0)
+aesvia_decN(const struct aesdec *dec, const uint8_t in[static 16],
+    uint8_t out[static 16], size_t nblocks, uint32_t cw0)
 {
        const uint32_t cw[4] __aligned(16) = {
                [0] = (cw0
@@ -150,7 +149,6 @@
                    | C3_CRYPT_CWLO_DECRYPT
                    | C3_CRYPT_CWLO_NORMAL),
        };
-       size_t nblocks = 1;
 
        KASSERT(((uintptr_t)dec & 0xf) == 0);
        KASSERT(((uintptr_t)in & 0xf) == 0);
@@ -180,7 +178,7 @@
        if ((((uintptr_t)in | (uintptr_t)out) & 0xf) == 0 &&
            ((uintptr_t)in & 0xff0) != 0xff0) {
                enc_aligned_evcnt.ev_count++;
-               aesvia_enc1(enc, in, out, cw0);
+               aesvia_encN(enc, in, out, 1, cw0);
        } else {
                enc_unaligned_evcnt.ev_count++;
                /*
@@ -194,7 +192,7 @@
                uint8_t outbuf[16] __aligned(16);
 
                memcpy(inbuf, in, 16);
-               aesvia_enc1(enc, inbuf, outbuf, cw0);
+               aesvia_encN(enc, inbuf, outbuf, 1, cw0);
                memcpy(out, outbuf, 16);
 
                explicit_memset(inbuf, 0, sizeof inbuf);
@@ -221,7 +219,7 @@
        if ((((uintptr_t)in | (uintptr_t)out) & 0xf) == 0 &&
            ((uintptr_t)in & 0xff0) != 0xff0) {
                dec_aligned_evcnt.ev_count++;
-               aesvia_dec1(dec, in, out, cw0);
+               aesvia_decN(dec, in, out, 1, cw0);
        } else {
                dec_unaligned_evcnt.ev_count++;
                /*
@@ -235,7 +233,7 @@
                uint8_t outbuf[16] __aligned(16);
 
                memcpy(inbuf, in, 16);
-               aesvia_dec1(dec, inbuf, outbuf, cw0);
+               aesvia_decN(dec, inbuf, outbuf, 1, cw0);
                memcpy(out, outbuf, 16);
 
                explicit_memset(inbuf, 0, sizeof inbuf);
@@ -245,7 +243,7 @@
 }
 
 static inline void
-aesvia_cbc_enc1(const struct aesenc *enc, const uint8_t in[static 16],
+aesvia_cbc_encN(const struct aesenc *enc, const uint8_t in[static 16],
     uint8_t out[static 16], size_t nblocks, uint8_t **ivp, uint32_t cw0)
 {
        const uint32_t cw[4] __aligned(16) = {
@@ -274,7 +272,7 @@
 }
 
 static inline void
-aesvia_cbc_dec1(const struct aesdec *dec, const uint8_t in[static 16],
+aesvia_cbc_decN(const struct aesdec *dec, const uint8_t in[static 16],
     uint8_t out[static 16], size_t nblocks, uint8_t iv[static 16],
     uint32_t cw0)
 {
@@ -340,7 +338,7 @@
        if ((((uintptr_t)in | (uintptr_t)out | (uintptr_t)iv) & 0xf) == 0) {
                cbcenc_aligned_evcnt.ev_count++;
                uint8_t *ivp = iv;
-               aesvia_cbc_enc1(enc, in, out, nbytes/16, &ivp, cw0);
+               aesvia_cbc_encN(enc, in, out, nbytes/16, &ivp, cw0);
                memcpy(iv, ivp, 16);
        } else {
                cbcenc_unaligned_evcnt.ev_count++;
@@ -351,7 +349,7 @@
                for (; nbytes; nbytes -= 16, in += 16, out += 16) {
                        memcpy(tmp, in, 16);
                        xor128(tmp, tmp, cv);
-                       aesvia_enc1(enc, tmp, cv, cw0);
+                       aesvia_encN(enc, tmp, cv, 1, cw0);
                        memcpy(out, cv, 16);
                }
                memcpy(iv, cv, 16);
@@ -381,7 +379,7 @@
        aesvia_reload_keys();
        if ((((uintptr_t)in | (uintptr_t)out | (uintptr_t)iv) & 0xf) == 0) {
                cbcdec_aligned_evcnt.ev_count++;
-               aesvia_cbc_dec1(dec, in, out, nbytes/16, iv, cw0);
+               aesvia_cbc_decN(dec, in, out, nbytes/16, iv, cw0);
        } else {
                cbcdec_unaligned_evcnt.ev_count++;
                uint8_t iv0[16] __aligned(16);
@@ -393,7 +391,7 @@
                memcpy(iv, cv, 16);
 
                for (;;) {
-                       aesvia_dec1(dec, cv, tmp, cw0);
+                       aesvia_decN(dec, cv, tmp, 1, cw0);
                        if ((nbytes -= 16) == 0)
                                break;
                        memcpy(cv, in + nbytes - 16, 16);
@@ -480,6 +478,7 @@
        if ((((uintptr_t)in | (uintptr_t)out) & 0xf) == 0) {
                xtsenc_aligned_evcnt.ev_count++;
                unsigned lastblock = 0;
+               uint32_t buf[8*4] __aligned(16);
 
                /*
                 * Make sure the last block is not the last block of a
@@ -491,20 +490,43 @@
                lastblock = 16*(((uintptr_t)(out + nbytes) & 0xfff) == 0);
                nbytes -= lastblock;
 
-               for (; nbytes; nbytes -= 16, in += 16, out += 16) {
-                       xor128(out, in, t);
-                       aesvia_enc1(enc, out, out, cw0);
-                       xor128(out, out, t);
-                       aesvia_xts_update(&t[0], &t[1], &t[2], &t[3]);
+               /*
+                * Handle an odd number of initial blocks so we can
+                * process the rest in eight-block (128-byte) chunks.
+                */
+               if (nbytes % 128) {
+                       unsigned nbytes128 = nbytes % 128;
+
+                       nbytes -= nbytes128;
+                       for (; nbytes128; nbytes128 -= 16, in += 16, out += 16)
+                       {
+                               xor128(out, in, t);
+                               aesvia_encN(enc, out, out, 1, cw0);
+                               xor128(out, out, t);
+                               aesvia_xts_update(&t[0], &t[1], &t[2], &t[3]);
+                       }
+               }
+
+               /* Process eight blocks at a time.  */
+               for (; nbytes; nbytes -= 128, in += 128, out += 128) {
+                       unsigned i;
+                       for (i = 0; i < 8; i++) {
+                               memcpy(buf + 4*i, t, 16);
+                               xor128(out + 4*i, in + 4*i, t);
+                               aesvia_xts_update(&t[0], &t[1], &t[2], &t[3]);
+                       }
+                       aesvia_encN(enc, out, out, 8, cw0);
+                       for (i = 0; i < 8; i++)
+                               xor128(out + 4*i, in + 4*i, buf + 4*i);
                }
 
                /* Handle the last block of a page, if necessary.  */
                if (lastblock) {
-                       uint8_t buf[16] __aligned(16);
                        xor128(buf, in, t);
-                       aesvia_enc1(enc, buf, out, cw0);
-                       explicit_memset(buf, 0, sizeof buf);
+                       aesvia_encN(enc, (const void *)buf, out, 1, cw0);
                }
+
+               explicit_memset(buf, 0, sizeof buf);
        } else {
                xtsenc_unaligned_evcnt.ev_count++;
                uint8_t buf[16] __aligned(16);
@@ -512,7 +534,7 @@
                for (; nbytes; nbytes -= 16, in += 16, out += 16) {
                        memcpy(buf, in, 16);
                        xor128(buf, buf, t);
-                       aesvia_enc1(enc, buf, buf, cw0);
+                       aesvia_encN(enc, buf, buf, 1, cw0);
                        xor128(buf, buf, t);
                        memcpy(out, buf, 16);
                        aesvia_xts_update(&t[0], &t[1], &t[2], &t[3]);
@@ -550,6 +572,7 @@
        if ((((uintptr_t)in | (uintptr_t)out) & 0xf) == 0) {
                xtsdec_aligned_evcnt.ev_count++;
                unsigned lastblock = 0;
+               uint32_t buf[8*4] __aligned(16);
 
                /*
                 * Make sure the last block is not the last block of a
@@ -561,20 +584,43 @@
                lastblock = 16*(((uintptr_t)(out + nbytes) & 0xfff) == 0);
                nbytes -= lastblock;
 
-               for (; nbytes; nbytes -= 16, in += 16, out += 16) {
-                       xor128(out, in, t);
-                       aesvia_dec1(dec, out, out, cw0);
-                       xor128(out, out, t);
-                       aesvia_xts_update(&t[0], &t[1], &t[2], &t[3]);
+               /*
+                * Handle an odd number of initial blocks so we can
+                * process the rest in eight-block (128-byte) chunks.
+                */
+               if (nbytes % 128) {
+                       unsigned nbytes128 = nbytes % 128;
+
+                       nbytes -= nbytes128;
+                       for (; nbytes128; nbytes128 -= 16, in += 16, out += 16)
+                       {
+                               xor128(out, in, t);
+                               aesvia_decN(dec, out, out, 1, cw0);
+                               xor128(out, out, t);
+                               aesvia_xts_update(&t[0], &t[1], &t[2], &t[3]);
+                       }
+               }
+
+               /* Process eight blocks at a time.  */
+               for (; nbytes; nbytes -= 128, in += 128, out += 128) {
+                       unsigned i;
+                       for (i = 0; i < 8; i++) {
+                               memcpy(buf + 4*i, t, 16);
+                               xor128(out + 4*i, in + 4*i, t);
+                               aesvia_xts_update(&t[0], &t[1], &t[2], &t[3]);
+                       }
+                       aesvia_decN(dec, out, out, 8, cw0);
+                       for (i = 0; i < 8; i++)
+                               xor128(out + 4*i, in + 4*i, buf + 4*i);
                }
 
                /* Handle the last block of a page, if necessary.  */
                if (lastblock) {
-                       uint8_t buf[16] __aligned(16);
                        xor128(buf, in, t);
-                       aesvia_dec1(dec, buf, out, cw0);
-                       explicit_memset(buf, 0, sizeof buf);
+                       aesvia_decN(dec, (const void *)buf, out, 1, cw0);
                }
+
+               explicit_memset(buf, 0, sizeof buf);
        } else {
                xtsdec_unaligned_evcnt.ev_count++;
                uint8_t buf[16] __aligned(16);
@@ -582,7 +628,7 @@
                for (; nbytes; nbytes -= 16, in += 16, out += 16) {
                        memcpy(buf, in, 16);
                        xor128(buf, buf, t);
-                       aesvia_dec1(dec, buf, buf, cw0);
+                       aesvia_decN(dec, buf, buf, 1, cw0);
                        xor128(buf, buf, t);
                        memcpy(out, buf, 16);
                        aesvia_xts_update(&t[0], &t[1], &t[2], &t[3]);



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