[Qemu-devel] [RFC 08/10] cryptodev: extract one util function

["Longpeng(Mike)" <longpeng2@huawei.com>]

From: Gonglei <arei.gonglei@huawei.com>

So that the new function can be used by both seesion creation
and the following stateless crypto operation.

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>
---
 backends/cryptodev-builtin.c | 100 +++++++++++++++++++++++++------------------
 1 file changed, 58 insertions(+), 42 deletions(-)

diff --git a/backends/cryptodev-builtin.c b/backends/cryptodev-builtin.c
index 6df23b9..ba6d15c 100644
--- a/backends/cryptodev-builtin.c
+++ b/backends/cryptodev-builtin.c
@@ -152,73 +152,56 @@ err:
    return -1;
 }
 
-static int cryptodev_builtin_create_cipher_session(
-                    CryptoDevBackendBuiltin *builtin,
+static int
+cryptodev_builtin_get_cipher_alg_mode(
                     CryptoDevBackendSymSessionInfo *sess_info,
+                    int *algo, int *mode,
                     Error **errp)
 {
-    int algo;
-    int mode;
-    QCryptoCipher *cipher;
-    int index;
-    CryptoDevBackendBuiltinSession *sess;
-
-    if (sess_info->op_type != VIRTIO_CRYPTO_SYM_OP_CIPHER) {
-        error_setg(errp, "Unsupported optype :%u", sess_info->op_type);
-        return -1;
-    }
-
-    index = cryptodev_builtin_get_unused_session_index(builtin);
-    if (index < 0) {
-        error_setg(errp, "Total number of sessions created exceeds %u",
-                  MAX_NUM_SESSIONS);
-        return -1;
-    }
-
     switch (sess_info->cipher_alg) {
     case VIRTIO_CRYPTO_CIPHER_AES_ECB:
-        mode = QCRYPTO_CIPHER_MODE_ECB;
-        algo = cryptodev_builtin_get_aes_algo(sess_info->key_len,
-                                                    mode, errp);
-        if (algo < 0)  {
+        *mode = QCRYPTO_CIPHER_MODE_ECB;
+        *algo = cryptodev_builtin_get_aes_algo(sess_info->key_len,
+                                               *mode, errp);
+        if (*algo < 0)  {
             return -1;
         }
         break;
     case VIRTIO_CRYPTO_CIPHER_AES_CBC:
-        mode = QCRYPTO_CIPHER_MODE_CBC;
-        algo = cryptodev_builtin_get_aes_algo(sess_info->key_len,
-                                                    mode, errp);
-        if (algo < 0)  {
+        *mode = QCRYPTO_CIPHER_MODE_CBC;
+        *algo = cryptodev_builtin_get_aes_algo(sess_info->key_len,
+                                               *mode, errp);
+        if (*algo < 0)  {
             return -1;
         }
         break;
     case VIRTIO_CRYPTO_CIPHER_AES_CTR:
-        mode = QCRYPTO_CIPHER_MODE_CTR;
-        algo = cryptodev_builtin_get_aes_algo(sess_info->key_len,
-                                                    mode, errp);
-        if (algo < 0)  {
+        *mode = QCRYPTO_CIPHER_MODE_CTR;
+        *algo = cryptodev_builtin_get_aes_algo(sess_info->key_len,
+                                              *mode, errp);
+        if (*algo < 0)  {
             return -1;
         }
         break;
     case VIRTIO_CRYPTO_CIPHER_AES_XTS:
-        mode = QCRYPTO_CIPHER_MODE_XTS;
-        algo = cryptodev_builtin_get_aes_algo(sess_info->key_len,
-                                                    mode, errp);
-        if (algo < 0)  {
+        *mode = QCRYPTO_CIPHER_MODE_XTS;
+        *algo = cryptodev_builtin_get_aes_algo(sess_info->key_len,
+                                               *mode, errp);
+        if (*algo < 0)  {
             return -1;
         }
         break;
     case VIRTIO_CRYPTO_CIPHER_3DES_ECB:
-        mode = QCRYPTO_CIPHER_MODE_ECB;
-        algo = QCRYPTO_CIPHER_ALG_3DES;
+        *mode = QCRYPTO_CIPHER_MODE_ECB;
+        *algo = QCRYPTO_CIPHER_ALG_3DES;
         break;
     case VIRTIO_CRYPTO_CIPHER_3DES_CBC:
-        mode = QCRYPTO_CIPHER_MODE_CBC;
-        algo = QCRYPTO_CIPHER_ALG_3DES;
+        *mode = QCRYPTO_CIPHER_MODE_CBC;
+        *algo = QCRYPTO_CIPHER_ALG_3DES;
         break;
     case VIRTIO_CRYPTO_CIPHER_3DES_CTR:
-        mode = QCRYPTO_CIPHER_MODE_CTR;
-        algo = QCRYPTO_CIPHER_ALG_3DES;
+        *mode = QCRYPTO_CIPHER_MODE_CTR;
+        *algo = QCRYPTO_CIPHER_ALG_3DES;
         break;
     default:
         error_setg(errp, "Unsupported cipher alg :%u",
@@ -226,6 +209,39 @@ static int cryptodev_builtin_create_cipher_session(
         return -1;
     }
 
+    return 0;
+}
+
+static int cryptodev_builtin_create_cipher_session(
+                    CryptoDevBackendBuiltin *builtin,
+                    CryptoDevBackendSymSessionInfo *sess_info,
+                    Error **errp)
+{
+    int algo;
+    int mode;
+    QCryptoCipher *cipher;
+    int index;
+    CryptoDevBackendBuiltinSession *sess;
+    int ret;
+
+    if (sess_info->op_type != VIRTIO_CRYPTO_SYM_OP_CIPHER) {
+        error_setg(errp, "Unsupported optype :%u", sess_info->op_type);
+        return -1;
+    }
+
+    index = cryptodev_builtin_get_unused_session_index(builtin);
+    if (index < 0) {
+        error_setg(errp, "Total number of sessions created exceeds %u",
+                  MAX_NUM_SESSIONS);
+        return -1;
+    }
+
+    ret = cryptodev_builtin_get_cipher_alg_mode(sess_info,
+                                                &algo, &mode, errp);
+    if (ret < 0) {
+        return -1;
+    }
+
     cipher = qcrypto_cipher_new(algo, mode,
                                sess_info->cipher_key,
                                sess_info->key_len,
-- 
1.8.3.1