drivers/crypto/virtio/virtio_crypto_common.h

   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 <crypto/aead.h>
  14 #include <crypto/aes.h>
  15 #include <crypto/engine.h>
  16
  17
  18 /* Internal representation of a data virtqueue */
  19 struct data_queue {
  20         /* Virtqueue associated with this send _queue */
  21         struct virtqueue *vq;
  22
  23         /* To protect the vq operations for the dataq */
  24         spinlock_t lock;
  25
  26         /* Name of the tx queue: dataq.$index */
  27         char name[32];
  28
  29         struct crypto_engine *engine;
  30 };
  31
  32 struct virtio_crypto {
  33         struct virtio_device *vdev;
  34         struct virtqueue *ctrl_vq;
  35         struct data_queue *data_vq;
  36
  37         /* To protect the vq operations for the controlq */
  38         spinlock_t ctrl_lock;
  39
  40         /* Maximum of data queues supported by the device */
  41         u32 max_data_queues;
  42
  43         /* Number of queue currently used by the driver */
  44         u32 curr_queue;
  45
  46         /*
  47          * Specifies the services mask which the device support,
  48          * see VIRTIO_CRYPTO_SERVICE_*
  49          */
  50         u32 crypto_services;
  51
  52         /* Detailed algorithms mask */
  53         u32 cipher_algo_l;
  54         u32 cipher_algo_h;
  55         u32 hash_algo;
  56         u32 mac_algo_l;
  57         u32 mac_algo_h;
  58         u32 aead_algo;
  59
  60         /* Maximum length of cipher key */
  61         u32 max_cipher_key_len;
  62         /* Maximum length of authenticated key */
  63         u32 max_auth_key_len;
  64         /* Maximum size of per request */
  65         u64 max_size;
  66
  67         /* Control VQ buffers: protected by the ctrl_lock */
  68         struct virtio_crypto_op_ctrl_req ctrl;
  69         struct virtio_crypto_session_input input;
  70         struct virtio_crypto_inhdr ctrl_status;
  71
  72         unsigned long status;
  73         atomic_t ref_count;
  74         struct list_head list;
  75         struct module *owner;
  76         uint8_t dev_id;
  77
  78         /* Does the affinity hint is set for virtqueues? */
  79         bool affinity_hint_set;
  80 };
  81
  82 struct virtio_crypto_sym_session_info {
  83         /* Backend session id, which come from the host side */
  84         __u64 session_id;
  85 };
  86
  87 struct virtio_crypto_request;
  88 typedef void (*virtio_crypto_data_callback)
  89                 (struct virtio_crypto_request *vc_req, int len);
  90
  91 struct virtio_crypto_request {
  92         uint8_t status;
  93         struct virtio_crypto_op_data_req *req_data;
  94         struct scatterlist **sgs;
  95         struct data_queue *dataq;
  96         virtio_crypto_data_callback alg_cb;
  97 };
  98
  99 int virtcrypto_devmgr_add_dev(struct virtio_crypto *vcrypto_dev);
 100 struct list_head *virtcrypto_devmgr_get_head(void);
 101 void virtcrypto_devmgr_rm_dev(struct virtio_crypto *vcrypto_dev);
 102 struct virtio_crypto *virtcrypto_devmgr_get_first(void);
 103 int virtcrypto_dev_in_use(struct virtio_crypto *vcrypto_dev);
 104 int virtcrypto_dev_get(struct virtio_crypto *vcrypto_dev);
 105 void virtcrypto_dev_put(struct virtio_crypto *vcrypto_dev);
 106 int virtcrypto_dev_started(struct virtio_crypto *vcrypto_dev);
 107 bool virtcrypto_algo_is_supported(struct virtio_crypto *vcrypto_dev,
 108                                   uint32_t service,
 109                                   uint32_t algo);
 110 struct virtio_crypto *virtcrypto_get_dev_node(int node,
 111                                               uint32_t service,
 112                                               uint32_t algo);
 113 int virtcrypto_dev_start(struct virtio_crypto *vcrypto);
 114 void virtcrypto_dev_stop(struct virtio_crypto *vcrypto);
 115 int virtio_crypto_skcipher_crypt_req(
 116         struct crypto_engine *engine, void *vreq);
 117
 118 void
 119 virtcrypto_clear_request(struct virtio_crypto_request *vc_req);
 120
 121 static inline int virtio_crypto_get_current_node(void)
 122 {
 123         int cpu, node;
 124
 125         cpu = get_cpu();
 126         node = topology_physical_package_id(cpu);
 127         put_cpu();
 128
 129         return node;
 130 }
 131
 132 int virtio_crypto_algs_register(struct virtio_crypto *vcrypto);
 133 void virtio_crypto_algs_unregister(struct virtio_crypto *vcrypto);
 134
 135 #endif /* _VIRTIO_CRYPTO_COMMON_H */