crypto: qat - allow xts requests not multiple of block

Allow AES-XTS requests that are not multiple of the block size.
If a request is smaller than the block size, return -EINVAL.

This fixes the following issue reported by the crypto testmgr self-test:

  alg: skcipher: qat_aes_xts encryption failed on test vector "random: len=116 klen=64"; expected_error=0, actual_error=-22, cfg="random: inplace may_sleep use_finup src_divs=[<reimport>45.85%@+4077, <flush>54.15%@alignmask+18]"

Fixes: 96ee111a ("crypto: qat - return error for block...")
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/qat/qat_common/qat_algs.c

@@ -11,6 +11,7 @@
 #include <crypto/hmac.h>
 #include <crypto/algapi.h>
 #include <crypto/authenc.h>
+#include <crypto/xts.h>
 #include <linux/dma-mapping.h>
 #include "adf_accel_devices.h"
 #include "adf_transport.h"
@@ -1058,6 +1059,14 @@ static int qat_alg_skcipher_blk_encrypt(struct skcipher_request *req)
 	return qat_alg_skcipher_encrypt(req);
 }
 
+static int qat_alg_skcipher_xts_encrypt(struct skcipher_request *req)
+{
+	if (req->cryptlen < XTS_BLOCK_SIZE)
+		return -EINVAL;
+
+	return qat_alg_skcipher_encrypt(req);
+}
+
 static int qat_alg_skcipher_decrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *stfm = crypto_skcipher_reqtfm(req);
@@ -1117,6 +1126,15 @@ static int qat_alg_skcipher_blk_decrypt(struct skcipher_request *req)
 
 	return qat_alg_skcipher_decrypt(req);
 }
+
+static int qat_alg_skcipher_xts_decrypt(struct skcipher_request *req)
+{
+	if (req->cryptlen < XTS_BLOCK_SIZE)
+		return -EINVAL;
+
+	return qat_alg_skcipher_decrypt(req);
+}
+
 static int qat_alg_aead_init(struct crypto_aead *tfm,
 			     enum icp_qat_hw_auth_algo hash,
 			     const char *hash_name)
@@ -1310,8 +1328,8 @@ static struct skcipher_alg qat_skciphers[] = { {
 	.init = qat_alg_skcipher_init_tfm,
 	.exit = qat_alg_skcipher_exit_tfm,
 	.setkey = qat_alg_skcipher_xts_setkey,
-	.decrypt = qat_alg_skcipher_blk_decrypt,
-	.encrypt = qat_alg_skcipher_blk_encrypt,
+	.decrypt = qat_alg_skcipher_xts_decrypt,
+	.encrypt = qat_alg_skcipher_xts_encrypt,
 	.min_keysize = 2 * AES_MIN_KEY_SIZE,
 	.max_keysize = 2 * AES_MAX_KEY_SIZE,
 	.ivsize = AES_BLOCK_SIZE,