1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* Common header for Virtio crypto device.
3  *
4  * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
5  */
6 
7 #ifndef _VIRTIO_CRYPTO_COMMON_H
8 #define _VIRTIO_CRYPTO_COMMON_H
9 
10 #include <linux/virtio.h>
11 #include <linux/crypto.h>
12 #include <linux/spinlock.h>
13 #include <linux/interrupt.h>
14 #include <crypto/aead.h>
15 #include <crypto/aes.h>
16 #include <crypto/engine.h>
17 #include <uapi/linux/virtio_crypto.h>
18 
19 
20 /* Internal representation of a data virtqueue */
21 struct data_queue {
22 	/* Virtqueue associated with this send _queue */
23 	struct virtqueue *vq;
24 
25 	/* To protect the vq operations for the dataq */
26 	spinlock_t lock;
27 
28 	/* Name of the tx queue: dataq.$index */
29 	char name[32];
30 
31 	struct crypto_engine *engine;
32 	struct tasklet_struct done_task;
33 };
34 
35 struct virtio_crypto {
36 	struct virtio_device *vdev;
37 	struct virtqueue *ctrl_vq;
38 	struct data_queue *data_vq;
39 
40 	/* Work struct for config space updates */
41 	struct work_struct config_work;
42 
43 	/* To protect the vq operations for the controlq */
44 	spinlock_t ctrl_lock;
45 
46 	/* Maximum of data queues supported by the device */
47 	u32 max_data_queues;
48 
49 	/* Number of queue currently used by the driver */
50 	u32 curr_queue;
51 
52 	/*
53 	 * Specifies the services mask which the device support,
54 	 * see VIRTIO_CRYPTO_SERVICE_*
55 	 */
56 	u32 crypto_services;
57 
58 	/* Detailed algorithms mask */
59 	u32 cipher_algo_l;
60 	u32 cipher_algo_h;
61 	u32 hash_algo;
62 	u32 mac_algo_l;
63 	u32 mac_algo_h;
64 	u32 aead_algo;
65 	u32 akcipher_algo;
66 
67 	/* Maximum length of cipher key */
68 	u32 max_cipher_key_len;
69 	/* Maximum length of authenticated key */
70 	u32 max_auth_key_len;
71 	/* Maximum size of per request */
72 	u64 max_size;
73 
74 	unsigned long status;
75 	atomic_t ref_count;
76 	struct list_head list;
77 	struct module *owner;
78 	uint8_t dev_id;
79 
80 	/* Does the affinity hint is set for virtqueues? */
81 	bool affinity_hint_set;
82 };
83 
84 struct virtio_crypto_sym_session_info {
85 	/* Backend session id, which come from the host side */
86 	__u64 session_id;
87 };
88 
89 /*
90  * Note: there are padding fields in request, clear them to zero before
91  *       sending to host to avoid to divulge any information.
92  * Ex, virtio_crypto_ctrl_request::ctrl::u::destroy_session::padding[48]
93  */
94 struct virtio_crypto_ctrl_request {
95 	struct virtio_crypto_op_ctrl_req ctrl;
96 	struct virtio_crypto_session_input input;
97 	struct virtio_crypto_inhdr ctrl_status;
98 	struct completion compl;
99 };
100 
101 struct virtio_crypto_request;
102 typedef void (*virtio_crypto_data_callback)
103 		(struct virtio_crypto_request *vc_req, int len);
104 
105 struct virtio_crypto_request {
106 	uint8_t status;
107 	struct virtio_crypto_op_data_req *req_data;
108 	struct scatterlist **sgs;
109 	struct data_queue *dataq;
110 	virtio_crypto_data_callback alg_cb;
111 };
112 
113 int virtcrypto_devmgr_add_dev(struct virtio_crypto *vcrypto_dev);
114 struct list_head *virtcrypto_devmgr_get_head(void);
115 void virtcrypto_devmgr_rm_dev(struct virtio_crypto *vcrypto_dev);
116 struct virtio_crypto *virtcrypto_devmgr_get_first(void);
117 int virtcrypto_dev_in_use(struct virtio_crypto *vcrypto_dev);
118 int virtcrypto_dev_get(struct virtio_crypto *vcrypto_dev);
119 void virtcrypto_dev_put(struct virtio_crypto *vcrypto_dev);
120 int virtcrypto_dev_started(struct virtio_crypto *vcrypto_dev);
121 bool virtcrypto_algo_is_supported(struct virtio_crypto *vcrypto_dev,
122 				  uint32_t service,
123 				  uint32_t algo);
124 struct virtio_crypto *virtcrypto_get_dev_node(int node,
125 					      uint32_t service,
126 					      uint32_t algo);
127 int virtcrypto_dev_start(struct virtio_crypto *vcrypto);
128 void virtcrypto_dev_stop(struct virtio_crypto *vcrypto);
129 int virtio_crypto_skcipher_crypt_req(
130 	struct crypto_engine *engine, void *vreq);
131 
132 void
133 virtcrypto_clear_request(struct virtio_crypto_request *vc_req);
134 
135 static inline int virtio_crypto_get_current_node(void)
136 {
137 	int cpu, node;
138 
139 	cpu = get_cpu();
140 	node = topology_physical_package_id(cpu);
141 	put_cpu();
142 
143 	return node;
144 }
145 
146 int virtio_crypto_skcipher_algs_register(struct virtio_crypto *vcrypto);
147 void virtio_crypto_skcipher_algs_unregister(struct virtio_crypto *vcrypto);
148 int virtio_crypto_akcipher_algs_register(struct virtio_crypto *vcrypto);
149 void virtio_crypto_akcipher_algs_unregister(struct virtio_crypto *vcrypto);
150 int virtio_crypto_ctrl_vq_request(struct virtio_crypto *vcrypto, struct scatterlist *sgs[],
151 				  unsigned int out_sgs, unsigned int in_sgs,
152 				  struct virtio_crypto_ctrl_request *vc_ctrl_req);
153 
154 #endif /* _VIRTIO_CRYPTO_COMMON_H */
155