crypto: qce - use AES fallback for small requests

Process small blocks using the fallback cipher, as a workaround for an
observed failure (DMA-related, apparently) when computing the GCM ghash
key.  This brings a speed gain as well, since it avoids the latency of
using the hardware engine to process small blocks.

Using software for all 16-byte requests would be enough to make GCM
work, but to increase performance, a larger threshold would be better.
Measuring the performance of supported ciphers with openssl speed,
software matches hardware at around 768-1024 bytes.

Considering the 256-bit ciphers, software is 2-3 times faster than qce
at 256-bytes, 30% faster at 512, and about even at 768-bytes.  With
128-bit keys, the break-even point would be around 1024-bytes.

This adds the 'aes_sw_max_len' parameter, to set the largest request
length processed by the software fallback.  Its default is being set to
512 bytes, a little lower than the break-even point, to balance the cost
in CPU usage.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index c2767ed54dfe928cb9f5faff35eb2ca5234cf339..052d3ff7fb20df1042abec1291a4c8a01531d817 100644 (file)
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -685,6 +685,29 @@ choice
 
 endchoice
 
+config CRYPTO_DEV_QCE_SW_MAX_LEN
+       int "Default maximum request size to use software for AES"
+       depends on CRYPTO_DEV_QCE && CRYPTO_DEV_QCE_SKCIPHER
+       default 512
+       help
+         This sets the default maximum request size to perform AES requests
+         using software instead of the crypto engine.  It can be changed by
+         setting the aes_sw_max_len parameter.
+
+         Small blocks are processed faster in software than hardware.
+         Considering the 256-bit ciphers, software is 2-3 times faster than
+         qce at 256-bytes, 30% faster at 512, and about even at 768-bytes.
+         With 128-bit keys, the break-even point would be around 1024-bytes.
+
+         The default is set a little lower, to 512 bytes, to balance the
+         cost in CPU usage.  The minimum recommended setting is 16-bytes
+         (1 AES block), since AES-GCM will fail if you set it lower.
+         Setting this to zero will send all requests to the hardware.
+
+         Note that 192-bit keys are not supported by the hardware and are
+         always processed by the software fallback, and all DES requests
+         are done by the hardware.
+
 config CRYPTO_DEV_QCOM_RNG
        tristate "Qualcomm Random Number Generator Driver"
        depends on ARCH_QCOM || COMPILE_TEST

diff --git a/drivers/crypto/qce/skcipher.c b/drivers/crypto/qce/skcipher.c
index 63ae75809cb705558b284a905cdddacf16c75613..fc7c940b5a43ee68cab58c2551df084b577dcc63 100644 (file)
--- a/drivers/crypto/qce/skcipher.c
+++ b/drivers/crypto/qce/skcipher.c
@@ -5,6 +5,7 @@
 
 #include <linux/device.h>
 #include <linux/interrupt.h>
+#include <linux/moduleparam.h>
 #include <linux/types.h>
 #include <crypto/aes.h>
 #include <crypto/internal/des.h>
@@ -12,6 +13,13 @@
 
 #include "cipher.h"
 
+static unsigned int aes_sw_max_len = CONFIG_CRYPTO_DEV_QCE_SW_MAX_LEN;
+module_param(aes_sw_max_len, uint, 0644);
+MODULE_PARM_DESC(aes_sw_max_len,
+                "Only use hardware for AES requests larger than this "
+                "[0=always use hardware; anything <16 breaks AES-GCM; default="
+                __stringify(CONFIG_CRYPTO_DEV_QCE_SOFT_THRESHOLD)"]");
+
 static LIST_HEAD(skcipher_algs);
 
 static void qce_skcipher_done(void *data)
@@ -166,15 +174,10 @@ static int qce_skcipher_setkey(struct crypto_skcipher *ablk, const u8 *key,
        switch (IS_XTS(flags) ? keylen >> 1 : keylen) {
        case AES_KEYSIZE_128:
        case AES_KEYSIZE_256:
+               memcpy(ctx->enc_key, key, keylen);
                break;
-       default:
-               goto fallback;
        }
 
-       ctx->enc_keylen = keylen;
-       memcpy(ctx->enc_key, key, keylen);
-       return 0;
-fallback:
        ret = crypto_sync_skcipher_setkey(ctx->fallback, key, keylen);
        if (!ret)
                ctx->enc_keylen = keylen;
@@ -224,8 +227,9 @@ static int qce_skcipher_crypt(struct skcipher_request *req, int encrypt)
        rctx->flags |= encrypt ? QCE_ENCRYPT : QCE_DECRYPT;
        keylen = IS_XTS(rctx->flags) ? ctx->enc_keylen >> 1 : ctx->enc_keylen;
 
-       if (IS_AES(rctx->flags) && keylen != AES_KEYSIZE_128 &&
-           keylen != AES_KEYSIZE_256) {
+       if (IS_AES(rctx->flags) &&
+           ((keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_256) ||
+            req->cryptlen <= aes_sw_max_len)) {
                SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);
 
                skcipher_request_set_sync_tfm(subreq, ctx->fallback);