Use parallel LRW and XTS encryption facilities to better utilize AES-NI
hardware pipelines and gain extra performance.
Tcrypt benchmark results (async), old vs new ratios:
Intel Core i5-2450M CPU (fam: 6, model: 42, step: 7)
aes:128bit
lrw:256bit xts:256bit
size lrw-enc lrw-dec xts-dec xts-dec
16B 0.99x 1.00x 1.22x 1.19x
64B 1.38x 1.50x 1.58x 1.61x
256B 2.04x 2.02x 2.27x 2.29x
1024B 2.56x 2.54x 2.89x 2.92x
8192B 2.85x 2.99x 3.40x 3.23x
aes:192bit
lrw:320bit xts:384bit
size lrw-enc lrw-dec xts-dec xts-dec
16B 1.08x 1.08x 1.16x 1.17x
64B 1.48x 1.54x 1.59x 1.65x
256B 2.18x 2.17x 2.29x 2.28x
1024B 2.67x 2.67x 2.87x 3.05x
8192B 2.93x 2.84x 3.28x 3.33x
aes:256bit
lrw:348bit xts:512bit
size lrw-enc lrw-dec xts-dec xts-dec
16B 1.07x 1.07x 1.18x 1.19x
64B 1.56x 1.56x 1.70x 1.71x
256B 2.22x 2.24x 2.46x 2.46x
1024B 2.76x 2.77x 3.13x 3.05x
8192B 2.99x 3.05x 3.40x 3.30x
Cc: Huang Ying <ying.huang@xxxxxxxxx>
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@xxxxxxxx>
---
arch/x86/crypto/aesni-intel_glue.c | 253 +++++++++++++++++++++++++++++++-----
crypto/Kconfig | 2
2 files changed, 220 insertions(+), 35 deletions(-)
diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c
index 648347a..7c04d0d 100644
--- a/arch/x86/crypto/aesni-intel_glue.c
+++ b/arch/x86/crypto/aesni-intel_glue.c
@@ -28,6 +28,9 @@
#include <crypto/aes.h>
#include <crypto/cryptd.h>
#include <crypto/ctr.h>
+#include <crypto/b128ops.h>
+#include <crypto/lrw.h>
+#include <crypto/xts.h>
#include <asm/cpu_device_id.h>
#include <asm/i387.h>
#include <asm/crypto/aes.h>
@@ -41,18 +44,10 @@
#define HAS_CTR
#endif
-#if defined(CONFIG_CRYPTO_LRW) || defined(CONFIG_CRYPTO_LRW_MODULE)
-#define HAS_LRW
-#endif
-
#if defined(CONFIG_CRYPTO_PCBC) || defined(CONFIG_CRYPTO_PCBC_MODULE)
#define HAS_PCBC
#endif
-#if defined(CONFIG_CRYPTO_XTS) || defined(CONFIG_CRYPTO_XTS_MODULE)
-#define HAS_XTS
-#endif
-
/* This data is stored at the end of the crypto_tfm struct.
* It's a type of per "session" data storage location.
* This needs to be 16 byte aligned.
@@ -79,6 +74,16 @@ struct aesni_hash_subkey_req_data {
#define AES_BLOCK_MASK (~(AES_BLOCK_SIZE-1))
#define RFC4106_HASH_SUBKEY_SIZE 16
+struct aesni_lrw_ctx {
+ struct lrw_table_ctx lrw_table;
+ u8 raw_aes_ctx[sizeof(struct crypto_aes_ctx) + AESNI_ALIGN - 1];
+};
+
+struct aesni_xts_ctx {
+ u8 raw_tweak_ctx[sizeof(struct crypto_aes_ctx) + AESNI_ALIGN - 1];
+ u8 raw_crypt_ctx[sizeof(struct crypto_aes_ctx) + AESNI_ALIGN - 1];
+};
+
asmlinkage int aesni_set_key(struct crypto_aes_ctx *ctx, const u8 *in_key,
unsigned int key_len);
asmlinkage void aesni_enc(struct crypto_aes_ctx *ctx, u8 *out,
@@ -398,13 +403,6 @@ static int ablk_rfc3686_ctr_init(struct crypto_tfm *tfm)
#endif
#endif
-#ifdef HAS_LRW
-static int ablk_lrw_init(struct crypto_tfm *tfm)
-{
- return ablk_init_common(tfm, "fpu(lrw(__driver-aes-aesni))");
-}
-#endif
-
#ifdef HAS_PCBC
static int ablk_pcbc_init(struct crypto_tfm *tfm)
{
@@ -412,12 +410,160 @@ static int ablk_pcbc_init(struct crypto_tfm *tfm)
}
#endif
-#ifdef HAS_XTS
-static int ablk_xts_init(struct crypto_tfm *tfm)
+static void lrw_xts_encrypt_callback(void *ctx, u8 *blks, unsigned int nbytes)
{
- return ablk_init_common(tfm, "fpu(xts(__driver-aes-aesni))");
+ aesni_ecb_enc(ctx, blks, blks, nbytes);
+}
+
+static void lrw_xts_decrypt_callback(void *ctx, u8 *blks, unsigned int nbytes)
+{
+ aesni_ecb_dec(ctx, blks, blks, nbytes);
+}
+
+static int lrw_aesni_setkey(struct crypto_tfm *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct aesni_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
+ int err;
+
+ err = aes_set_key_common(tfm, ctx->raw_aes_ctx, key,
+ keylen - AES_BLOCK_SIZE);
+ if (err)
+ return err;
+
+ return lrw_init_table(&ctx->lrw_table, key + keylen - AES_BLOCK_SIZE);
+}
+
+static void lrw_aesni_exit_tfm(struct crypto_tfm *tfm)
+{
+ struct aesni_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ lrw_free_table(&ctx->lrw_table);
+}
+
+static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+ struct scatterlist *src, unsigned int nbytes)
+{
+ struct aesni_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+ be128 buf[8];
+ struct lrw_crypt_req req = {
+ .tbuf = buf,
+ .tbuflen = sizeof(buf),
+
+ .table_ctx = &ctx->lrw_table,
+ .crypt_ctx = aes_ctx(ctx->raw_aes_ctx),
+ .crypt_fn = lrw_xts_encrypt_callback,
+ };
+ int ret;
+
+ desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
+
+ kernel_fpu_begin();
+ ret = lrw_crypt(desc, dst, src, nbytes, &req);
+ kernel_fpu_end();
+
+ return ret;
+}
+
+static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+ struct scatterlist *src, unsigned int nbytes)
+{
+ struct aesni_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+ be128 buf[8];
+ struct lrw_crypt_req req = {
+ .tbuf = buf,
+ .tbuflen = sizeof(buf),
+
+ .table_ctx = &ctx->lrw_table,
+ .crypt_ctx = aes_ctx(ctx->raw_aes_ctx),
+ .crypt_fn = lrw_xts_decrypt_callback,
+ };
+ int ret;
+
+ desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
+
+ kernel_fpu_begin();
+ ret = lrw_crypt(desc, dst, src, nbytes, &req);
+ kernel_fpu_end();
+
+ return ret;
+}
+
+static int xts_aesni_setkey(struct crypto_tfm *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct aesni_xts_ctx *ctx = crypto_tfm_ctx(tfm);
+ u32 *flags = &tfm->crt_flags;
+ int err;
+
+ /* key consists of keys of equal size concatenated, therefore
+ * the length must be even
+ */
+ if (keylen % 2) {
+ *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
+ return -EINVAL;
+ }
+
+ /* first half of xts-key is for crypt */
+ err = aes_set_key_common(tfm, ctx->raw_crypt_ctx, key, keylen / 2);
+ if (err)
+ return err;
+
+ /* second half of xts-key is for tweak */
+ return aes_set_key_common(tfm, ctx->raw_tweak_ctx, key + keylen / 2,
+ keylen / 2);
+}
+
+
+static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+ struct scatterlist *src, unsigned int nbytes)
+{
+ struct aesni_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+ be128 buf[8];
+ struct xts_crypt_req req = {
+ .tbuf = buf,
+ .tbuflen = sizeof(buf),
+
+ .tweak_ctx = aes_ctx(ctx->raw_tweak_ctx),
+ .tweak_fn = XTS_TWEAK_CAST(aesni_enc),
+ .crypt_ctx = aes_ctx(ctx->raw_crypt_ctx),
+ .crypt_fn = lrw_xts_encrypt_callback,
+ };
+ int ret;
+
+ desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
+
+ kernel_fpu_begin();
+ ret = xts_crypt(desc, dst, src, nbytes, &req);
+ kernel_fpu_end();
+
+ return ret;
+}
+
+static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+ struct scatterlist *src, unsigned int nbytes)
+{
+ struct aesni_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+ be128 buf[8];
+ struct xts_crypt_req req = {
+ .tbuf = buf,
+ .tbuflen = sizeof(buf),
+
+ .tweak_ctx = aes_ctx(ctx->raw_tweak_ctx),
+ .tweak_fn = XTS_TWEAK_CAST(aesni_enc),
+ .crypt_ctx = aes_ctx(ctx->raw_crypt_ctx),
+ .crypt_fn = lrw_xts_decrypt_callback,
+ };
+ int ret;
+
+ desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
+
+ kernel_fpu_begin();
+ ret = xts_crypt(desc, dst, src, nbytes, &req);
+ kernel_fpu_end();
+
+ return ret;
}
-#endif
#ifdef CONFIG_X86_64
static int rfc4106_init(struct crypto_tfm *tfm)
@@ -1035,10 +1181,10 @@ static struct crypto_alg aesni_algs[] = { {
},
#endif
#endif
-#ifdef HAS_LRW
+#ifdef HAS_PCBC
}, {
- .cra_name = "lrw(aes)",
- .cra_driver_name = "lrw-aes-aesni",
+ .cra_name = "pcbc(aes)",
+ .cra_driver_name = "pcbc-aes-aesni",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = AES_BLOCK_SIZE,
@@ -1046,12 +1192,12 @@ static struct crypto_alg aesni_algs[] = { {
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
- .cra_init = ablk_lrw_init,
+ .cra_init = ablk_pcbc_init,
.cra_exit = ablk_exit,
.cra_u = {
.ablkcipher = {
- .min_keysize = AES_MIN_KEY_SIZE + AES_BLOCK_SIZE,
- .max_keysize = AES_MAX_KEY_SIZE + AES_BLOCK_SIZE,
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = ablk_set_key,
.encrypt = ablk_encrypt,
@@ -1059,10 +1205,50 @@ static struct crypto_alg aesni_algs[] = { {
},
},
#endif
-#ifdef HAS_PCBC
}, {
- .cra_name = "pcbc(aes)",
- .cra_driver_name = "pcbc-aes-aesni",
+ .cra_name = "__lrw-aes-aesni",
+ .cra_driver_name = "__driver-lrw-aes-aesni",
+ .cra_priority = 0,
+ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct aesni_lrw_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_blkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_exit = lrw_aesni_exit_tfm,
+ .cra_u = {
+ .blkcipher = {
+ .min_keysize = AES_MIN_KEY_SIZE + AES_BLOCK_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE + AES_BLOCK_SIZE,
+ .ivsize = AES_BLOCK_SIZE,
+ .setkey = lrw_aesni_setkey,
+ .encrypt = lrw_encrypt,
+ .decrypt = lrw_decrypt,
+ },
+ },
+}, {
+ .cra_name = "__xts-aes-aesni",
+ .cra_driver_name = "__driver-xts-aes-aesni",
+ .cra_priority = 0,
+ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct aesni_xts_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_blkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_u = {
+ .blkcipher = {
+ .min_keysize = 2 * AES_MIN_KEY_SIZE,
+ .max_keysize = 2 * AES_MAX_KEY_SIZE,
+ .ivsize = AES_BLOCK_SIZE,
+ .setkey = xts_aesni_setkey,
+ .encrypt = xts_encrypt,
+ .decrypt = xts_decrypt,
+ },
+ },
+}, {
+ .cra_name = "lrw(aes)",
+ .cra_driver_name = "lrw-aes-aesni",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = AES_BLOCK_SIZE,
@@ -1070,20 +1256,18 @@ static struct crypto_alg aesni_algs[] = { {
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
- .cra_init = ablk_pcbc_init,
+ .cra_init = ablk_init,
.cra_exit = ablk_exit,
.cra_u = {
.ablkcipher = {
- .min_keysize = AES_MIN_KEY_SIZE,
- .max_keysize = AES_MAX_KEY_SIZE,
+ .min_keysize = AES_MIN_KEY_SIZE + AES_BLOCK_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE + AES_BLOCK_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = ablk_set_key,
.encrypt = ablk_encrypt,
.decrypt = ablk_decrypt,
},
},
-#endif
-#ifdef HAS_XTS
}, {
.cra_name = "xts(aes)",
.cra_driver_name = "xts-aes-aesni",
@@ -1094,7 +1278,7 @@ static struct crypto_alg aesni_algs[] = { {
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
- .cra_init = ablk_xts_init,
+ .cra_init = ablk_init,
.cra_exit = ablk_exit,
.cra_u = {
.ablkcipher = {
@@ -1106,7 +1290,6 @@ static struct crypto_alg aesni_algs[] = { {
.decrypt = ablk_decrypt,
},
},
-#endif
} };
diff --git a/crypto/Kconfig b/crypto/Kconfig
index a323805..e376d70 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -564,6 +564,8 @@ config CRYPTO_AES_NI_INTEL
select CRYPTO_CRYPTD
select CRYPTO_ABLK_HELPER_X86
select CRYPTO_ALGAPI
+ select CRYPTO_LRW
+ select CRYPTO_XTS
help
Use Intel AES-NI instructions for AES algorithm.
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