crypto: aes-ni - Add support for more modes

Because kernel_fpu_begin() and kernel_fpu_end() operations are too
slow, the performance gain of general mode implementation + aes-aesni
is almost all compensated.

The AES-NI support for more modes are implemented as follow:

- Add a new AES algorithm implementation named __aes-aesni without
  kernel_fpu_begin/end()

- Use fpu(<mode>(AES)) to provide kenrel_fpu_begin/end() invoking

- Add <mode>(AES) ablkcipher, which uses cryptd(fpu(<mode>(AES))) to
  defer cryption to cryptd context in soft_irq context.

Now the ctr, lrw, pcbc and xts support are added.

Performance testing based on dm-crypt shows that cryption time can be
reduced to 50% of general mode implementation + aes-aesni implementation.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 266 insertions, 1 deletions

diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c
index 02af0af65497..4e663398f77f 100644
--- a/arch/x86/crypto/aesni-intel_glue.c
+++ b/arch/x86/crypto/aesni-intel_glue.c
@@ -21,6 +21,22 @@
 #include <asm/i387.h>
 #include <asm/aes.h>
 
+#if defined(CONFIG_CRYPTO_CTR) || defined(CONFIG_CRYPTO_CTR_MODULE)
+#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
+
 struct async_aes_ctx {
         struct cryptd_ablkcipher *cryptd_tfm;
 };
@@ -137,6 +153,41 @@ static struct crypto_alg aesni_alg = {
         }
 };
 
+static void __aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+        struct crypto_aes_ctx *ctx = aes_ctx(crypto_tfm_ctx(tfm));
+
+        aesni_enc(ctx, dst, src);
+}
+
+static void __aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+        struct crypto_aes_ctx *ctx = aes_ctx(crypto_tfm_ctx(tfm));
+
+        aesni_dec(ctx, dst, src);
+}
+
+static struct crypto_alg __aesni_alg = {
+        .cra_name               = "__aes-aesni",
+        .cra_driver_name        = "__driver-aes-aesni",
+        .cra_priority           = 0,
+        .cra_flags              = CRYPTO_ALG_TYPE_CIPHER,
+        .cra_blocksize          = AES_BLOCK_SIZE,
+        .cra_ctxsize            = sizeof(struct crypto_aes_ctx)+AESNI_ALIGN-1,
+        .cra_alignmask          = 0,
+        .cra_module             = THIS_MODULE,
+        .cra_list               = LIST_HEAD_INIT(__aesni_alg.cra_list),
+        .cra_u  = {
+                .cipher = {
+                        .cia_min_keysize        = AES_MIN_KEY_SIZE,
+                        .cia_max_keysize        = AES_MAX_KEY_SIZE,
+                        .cia_setkey             = aes_set_key,
+                        .cia_encrypt            = __aes_encrypt,
+                        .cia_decrypt            = __aes_decrypt
+                }
+        }
+};
+
 static int ecb_encrypt(struct blkcipher_desc *desc,
                        struct scatterlist *dst, struct scatterlist *src,
                        unsigned int nbytes)
@@ -277,8 +328,16 @@ static int ablk_set_key(struct crypto_ablkcipher *tfm, const u8 *key,
                         unsigned int key_len)
 {
         struct async_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
+        struct crypto_ablkcipher *child = &ctx->cryptd_tfm->base;
+        int err;
 
-        return crypto_ablkcipher_setkey(&ctx->cryptd_tfm->base, key, key_len);
+        crypto_ablkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
+        crypto_ablkcipher_set_flags(child, crypto_ablkcipher_get_flags(tfm)
+                                    & CRYPTO_TFM_REQ_MASK);
+        err = crypto_ablkcipher_setkey(child, key, key_len);
+        crypto_ablkcipher_set_flags(tfm, crypto_ablkcipher_get_flags(child)
+                                    & CRYPTO_TFM_RES_MASK);
+        return err;
 }
 
 static int ablk_encrypt(struct ablkcipher_request *req)
@@ -411,6 +470,163 @@ static struct crypto_alg ablk_cbc_alg = {
         },
 };
 
+#ifdef HAS_CTR
+static int ablk_ctr_init(struct crypto_tfm *tfm)
+{
+        struct cryptd_ablkcipher *cryptd_tfm;
+
+        cryptd_tfm = cryptd_alloc_ablkcipher("fpu(ctr(__driver-aes-aesni))",
+                                             0, 0);
+        if (IS_ERR(cryptd_tfm))
+                return PTR_ERR(cryptd_tfm);
+        ablk_init_common(tfm, cryptd_tfm);
+        return 0;
+}
+
+static struct crypto_alg ablk_ctr_alg = {
+        .cra_name               = "ctr(aes)",
+        .cra_driver_name        = "ctr-aes-aesni",
+        .cra_priority           = 400,
+        .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
+        .cra_blocksize          = 1,
+        .cra_ctxsize            = sizeof(struct async_aes_ctx),
+        .cra_alignmask          = 0,
+        .cra_type               = &crypto_ablkcipher_type,
+        .cra_module             = THIS_MODULE,
+        .cra_list               = LIST_HEAD_INIT(ablk_ctr_alg.cra_list),
+        .cra_init               = ablk_ctr_init,
+        .cra_exit               = ablk_exit,
+        .cra_u = {
+                .ablkcipher = {
+                        .min_keysize    = AES_MIN_KEY_SIZE,
+                        .max_keysize    = AES_MAX_KEY_SIZE,
+                        .ivsize         = AES_BLOCK_SIZE,
+                        .setkey         = ablk_set_key,
+                        .encrypt        = ablk_encrypt,
+                        .decrypt        = ablk_decrypt,
+                        .geniv          = "chainiv",
+                },
+        },
+};
+#endif
+
+#ifdef HAS_LRW
+static int ablk_lrw_init(struct crypto_tfm *tfm)
+{
+        struct cryptd_ablkcipher *cryptd_tfm;
+
+        cryptd_tfm = cryptd_alloc_ablkcipher("fpu(lrw(__driver-aes-aesni))",
+                                             0, 0);
+        if (IS_ERR(cryptd_tfm))
+                return PTR_ERR(cryptd_tfm);
+        ablk_init_common(tfm, cryptd_tfm);
+        return 0;
+}
+
+static struct crypto_alg ablk_lrw_alg = {
+        .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,
+        .cra_ctxsize            = sizeof(struct async_aes_ctx),
+        .cra_alignmask          = 0,
+        .cra_type               = &crypto_ablkcipher_type,
+        .cra_module             = THIS_MODULE,
+        .cra_list               = LIST_HEAD_INIT(ablk_lrw_alg.cra_list),
+        .cra_init               = ablk_lrw_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,
+                        .ivsize         = AES_BLOCK_SIZE,
+                        .setkey         = ablk_set_key,
+                        .encrypt        = ablk_encrypt,
+                        .decrypt        = ablk_decrypt,
+                },
+        },
+};
+#endif
+
+#ifdef HAS_PCBC
+static int ablk_pcbc_init(struct crypto_tfm *tfm)
+{
+        struct cryptd_ablkcipher *cryptd_tfm;
+
+        cryptd_tfm = cryptd_alloc_ablkcipher("fpu(pcbc(__driver-aes-aesni))",
+                                             0, 0);
+        if (IS_ERR(cryptd_tfm))
+                return PTR_ERR(cryptd_tfm);
+        ablk_init_common(tfm, cryptd_tfm);
+        return 0;
+}
+
+static struct crypto_alg ablk_pcbc_alg = {
+        .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,
+        .cra_ctxsize            = sizeof(struct async_aes_ctx),
+        .cra_alignmask          = 0,
+        .cra_type               = &crypto_ablkcipher_type,
+        .cra_module             = THIS_MODULE,
+        .cra_list               = LIST_HEAD_INIT(ablk_pcbc_alg.cra_list),
+        .cra_init               = ablk_pcbc_init,
+        .cra_exit               = ablk_exit,
+        .cra_u = {
+                .ablkcipher = {
+                        .min_keysize    = AES_MIN_KEY_SIZE,
+                        .max_keysize    = AES_MAX_KEY_SIZE,
+                        .ivsize         = AES_BLOCK_SIZE,
+                        .setkey         = ablk_set_key,
+                        .encrypt        = ablk_encrypt,
+                        .decrypt        = ablk_decrypt,
+                },
+        },
+};
+#endif
+
+#ifdef HAS_XTS
+static int ablk_xts_init(struct crypto_tfm *tfm)
+{
+        struct cryptd_ablkcipher *cryptd_tfm;
+
+        cryptd_tfm = cryptd_alloc_ablkcipher("fpu(xts(__driver-aes-aesni))",
+                                             0, 0);
+        if (IS_ERR(cryptd_tfm))
+                return PTR_ERR(cryptd_tfm);
+        ablk_init_common(tfm, cryptd_tfm);
+        return 0;
+}
+
+static struct crypto_alg ablk_xts_alg = {
+        .cra_name               = "xts(aes)",
+        .cra_driver_name        = "xts-aes-aesni",
+        .cra_priority           = 400,
+        .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
+        .cra_blocksize          = AES_BLOCK_SIZE,
+        .cra_ctxsize            = sizeof(struct async_aes_ctx),
+        .cra_alignmask          = 0,
+        .cra_type               = &crypto_ablkcipher_type,
+        .cra_module             = THIS_MODULE,
+        .cra_list               = LIST_HEAD_INIT(ablk_xts_alg.cra_list),
+        .cra_init               = ablk_xts_init,
+        .cra_exit               = ablk_exit,
+        .cra_u = {
+                .ablkcipher = {
+                        .min_keysize    = 2 * AES_MIN_KEY_SIZE,
+                        .max_keysize    = 2 * AES_MAX_KEY_SIZE,
+                        .ivsize         = AES_BLOCK_SIZE,
+                        .setkey         = ablk_set_key,
+                        .encrypt        = ablk_encrypt,
+                        .decrypt        = ablk_decrypt,
+                },
+        },
+};
+#endif
+
 static int __init aesni_init(void)
 {
         int err;
@@ -421,6 +637,8 @@ static int __init aesni_init(void)
         }
         if ((err = crypto_register_alg(&aesni_alg)))
                 goto aes_err;
+        if ((err = crypto_register_alg(&__aesni_alg)))
+                goto __aes_err;
         if ((err = crypto_register_alg(&blk_ecb_alg)))
                 goto blk_ecb_err;
         if ((err = crypto_register_alg(&blk_cbc_alg)))
@@ -429,9 +647,41 @@ static int __init aesni_init(void)
                 goto ablk_ecb_err;
         if ((err = crypto_register_alg(&ablk_cbc_alg)))
                 goto ablk_cbc_err;
+#ifdef HAS_CTR
+        if ((err = crypto_register_alg(&ablk_ctr_alg)))
+                goto ablk_ctr_err;
+#endif
+#ifdef HAS_LRW
+        if ((err = crypto_register_alg(&ablk_lrw_alg)))
+                goto ablk_lrw_err;
+#endif
+#ifdef HAS_PCBC
+        if ((err = crypto_register_alg(&ablk_pcbc_alg)))
+                goto ablk_pcbc_err;
+#endif
+#ifdef HAS_XTS
+        if ((err = crypto_register_alg(&ablk_xts_alg)))
+                goto ablk_xts_err;
+#endif
 
         return err;
 
+#ifdef HAS_XTS
+ablk_xts_err:
+#endif
+#ifdef HAS_PCBC
+        crypto_unregister_alg(&ablk_pcbc_alg);
+ablk_pcbc_err:
+#endif
+#ifdef HAS_LRW
+        crypto_unregister_alg(&ablk_lrw_alg);
+ablk_lrw_err:
+#endif
+#ifdef HAS_CTR
+        crypto_unregister_alg(&ablk_ctr_alg);
+ablk_ctr_err:
+#endif
+        crypto_unregister_alg(&ablk_cbc_alg);
 ablk_cbc_err:
         crypto_unregister_alg(&ablk_ecb_alg);
 ablk_ecb_err:
@@ -439,6 +689,8 @@ ablk_ecb_err:
 blk_cbc_err:
         crypto_unregister_alg(&blk_ecb_alg);
 blk_ecb_err:
+        crypto_unregister_alg(&__aesni_alg);
+__aes_err:
         crypto_unregister_alg(&aesni_alg);
 aes_err:
         return err;
@@ -446,10 +698,23 @@ aes_err:
 
 static void __exit aesni_exit(void)
 {
+#ifdef HAS_XTS
+        crypto_unregister_alg(&ablk_xts_alg);
+#endif
+#ifdef HAS_PCBC
+        crypto_unregister_alg(&ablk_pcbc_alg);
+#endif
+#ifdef HAS_LRW
+        crypto_unregister_alg(&ablk_lrw_alg);
+#endif
+#ifdef HAS_CTR
+        crypto_unregister_alg(&ablk_ctr_alg);
+#endif
         crypto_unregister_alg(&ablk_cbc_alg);
         crypto_unregister_alg(&ablk_ecb_alg);
         crypto_unregister_alg(&blk_cbc_alg);
         crypto_unregister_alg(&blk_ecb_alg);
+        crypto_unregister_alg(&__aesni_alg);
         crypto_unregister_alg(&aesni_alg);
 }