1 /* Common header for Virtio crypto device.
2  *
3  * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, see <http://www.gnu.org/licenses/>.
17  */
18 
19 #ifndef _VIRTIO_CRYPTO_COMMON_H
20 #define _VIRTIO_CRYPTO_COMMON_H
21 
22 #include <linux/virtio.h>
23 #include <linux/crypto.h>
24 #include <linux/spinlock.h>
25 #include <crypto/aead.h>
26 #include <crypto/aes.h>
27 #include <crypto/authenc.h>
28 
29 
30 /* Internal representation of a data virtqueue */
31 struct data_queue {
32 	/* Virtqueue associated with this send _queue */
33 	struct virtqueue *vq;
34 
35 	/* To protect the vq operations for the dataq */
36 	spinlock_t lock;
37 
38 	/* Name of the tx queue: dataq.$index */
39 	char name[32];
40 };
41 
42 struct virtio_crypto {
43 	struct virtio_device *vdev;
44 	struct virtqueue *ctrl_vq;
45 	struct data_queue *data_vq;
46 
47 	/* To protect the vq operations for the controlq */
48 	spinlock_t ctrl_lock;
49 
50 	/* Maximum of data queues supported by the device */
51 	u32 max_data_queues;
52 
53 	/* Number of queue currently used by the driver */
54 	u32 curr_queue;
55 
56 	/* Maximum length of cipher key */
57 	u32 max_cipher_key_len;
58 	/* Maximum length of authenticated key */
59 	u32 max_auth_key_len;
60 	/* Maximum size of per request */
61 	u64 max_size;
62 
63 	/* Control VQ buffers: protected by the ctrl_lock */
64 	struct virtio_crypto_op_ctrl_req ctrl;
65 	struct virtio_crypto_session_input input;
66 	struct virtio_crypto_inhdr ctrl_status;
67 
68 	unsigned long status;
69 	atomic_t ref_count;
70 	struct list_head list;
71 	struct module *owner;
72 	uint8_t dev_id;
73 
74 	/* Does the affinity hint is set for virtqueues? */
75 	bool affinity_hint_set;
76 };
77 
78 struct virtio_crypto_sym_session_info {
79 	/* Backend session id, which come from the host side */
80 	__u64 session_id;
81 };
82 
83 struct virtio_crypto_ablkcipher_ctx {
84 	struct virtio_crypto *vcrypto;
85 	struct crypto_tfm *tfm;
86 
87 	struct virtio_crypto_sym_session_info enc_sess_info;
88 	struct virtio_crypto_sym_session_info dec_sess_info;
89 };
90 
91 struct virtio_crypto_request {
92 	/* Cipher or aead */
93 	uint32_t type;
94 	uint8_t status;
95 	struct virtio_crypto_ablkcipher_ctx *ablkcipher_ctx;
96 	struct ablkcipher_request *ablkcipher_req;
97 	struct virtio_crypto_op_data_req *req_data;
98 	struct scatterlist **sgs;
99 	uint8_t *iv;
100 };
101 
102 int virtcrypto_devmgr_add_dev(struct virtio_crypto *vcrypto_dev);
103 struct list_head *virtcrypto_devmgr_get_head(void);
104 void virtcrypto_devmgr_rm_dev(struct virtio_crypto *vcrypto_dev);
105 struct virtio_crypto *virtcrypto_devmgr_get_first(void);
106 int virtcrypto_dev_in_use(struct virtio_crypto *vcrypto_dev);
107 int virtcrypto_dev_get(struct virtio_crypto *vcrypto_dev);
108 void virtcrypto_dev_put(struct virtio_crypto *vcrypto_dev);
109 int virtcrypto_dev_started(struct virtio_crypto *vcrypto_dev);
110 struct virtio_crypto *virtcrypto_get_dev_node(int node);
111 int virtcrypto_dev_start(struct virtio_crypto *vcrypto);
112 void virtcrypto_dev_stop(struct virtio_crypto *vcrypto);
113 
114 static inline int virtio_crypto_get_current_node(void)
115 {
116 	int cpu, node;
117 
118 	cpu = get_cpu();
119 	node = topology_physical_package_id(cpu);
120 	put_cpu();
121 
122 	return node;
123 }
124 
125 int virtio_crypto_algs_register(void);
126 void virtio_crypto_algs_unregister(void);
127 
128 #endif /* _VIRTIO_CRYPTO_COMMON_H */
129