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 <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 */