drivers/crypto/virtio/virtio_crypto_common.h

   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/engine.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         struct crypto_engine *engine;
  42 };
  43
  44 struct virtio_crypto {
  45         struct virtio_device *vdev;
  46         struct virtqueue *ctrl_vq;
  47         struct data_queue *data_vq;
  48
  49         /* To protect the vq operations for the controlq */
  50         spinlock_t ctrl_lock;
  51
  52         /* Maximum of data queues supported by the device */
  53         u32 max_data_queues;
  54
  55         /* Number of queue currently used by the driver */
  56         u32 curr_queue;
  57
  58         /*
  59          * Specifies the services mask which the device support,
  60          * see VIRTIO_CRYPTO_SERVICE_*
  61          */
  62         u32 crypto_services;
  63
  64         /* Detailed algorithms mask */
  65         u32 cipher_algo_l;
  66         u32 cipher_algo_h;
  67         u32 hash_algo;
  68         u32 mac_algo_l;
  69         u32 mac_algo_h;
  70         u32 aead_algo;
  71
  72         /* Maximum length of cipher key */
  73         u32 max_cipher_key_len;
  74         /* Maximum length of authenticated key */
  75         u32 max_auth_key_len;
  76         /* Maximum size of per request */
  77         u64 max_size;
  78
  79         /* Control VQ buffers: protected by the ctrl_lock */
  80         struct virtio_crypto_op_ctrl_req ctrl;
  81         struct virtio_crypto_session_input input;
  82         struct virtio_crypto_inhdr ctrl_status;
  83
  84         unsigned long status;
  85         atomic_t ref_count;
  86         struct list_head list;
  87         struct module *owner;
  88         uint8_t dev_id;
  89
  90         /* Does the affinity hint is set for virtqueues? */
  91         bool affinity_hint_set;
  92 };
  93
  94 struct virtio_crypto_sym_session_info {
  95         /* Backend session id, which come from the host side */
  96         __u64 session_id;
  97 };
  98
  99 struct virtio_crypto_request;
 100 typedef void (*virtio_crypto_data_callback)
 101                 (struct virtio_crypto_request *vc_req, int len);
 102
 103 struct virtio_crypto_request {
 104         uint8_t status;
 105         struct virtio_crypto_op_data_req *req_data;
 106         struct scatterlist **sgs;
 107         struct data_queue *dataq;
 108         virtio_crypto_data_callback alg_cb;
 109 };
 110
 111 int virtcrypto_devmgr_add_dev(struct virtio_crypto *vcrypto_dev);
 112 struct list_head *virtcrypto_devmgr_get_head(void);
 113 void virtcrypto_devmgr_rm_dev(struct virtio_crypto *vcrypto_dev);
 114 struct virtio_crypto *virtcrypto_devmgr_get_first(void);
 115 int virtcrypto_dev_in_use(struct virtio_crypto *vcrypto_dev);
 116 int virtcrypto_dev_get(struct virtio_crypto *vcrypto_dev);
 117 void virtcrypto_dev_put(struct virtio_crypto *vcrypto_dev);
 118 int virtcrypto_dev_started(struct virtio_crypto *vcrypto_dev);
 119 bool virtcrypto_algo_is_supported(struct virtio_crypto *vcrypto_dev,
 120                                   uint32_t service,
 121                                   uint32_t algo);
 122 struct virtio_crypto *virtcrypto_get_dev_node(int node,
 123                                               uint32_t service,
 124                                               uint32_t algo);
 125 int virtcrypto_dev_start(struct virtio_crypto *vcrypto);
 126 void virtcrypto_dev_stop(struct virtio_crypto *vcrypto);
 127 int virtio_crypto_ablkcipher_crypt_req(
 128         struct crypto_engine *engine, void *vreq);
 129
 130 void
 131 virtcrypto_clear_request(struct virtio_crypto_request *vc_req);
 132
 133 static inline int virtio_crypto_get_current_node(void)
 134 {
 135         int cpu, node;
 136
 137         cpu = get_cpu();
 138         node = topology_physical_package_id(cpu);
 139         put_cpu();
 140
 141         return node;
 142 }
 143
 144 int virtio_crypto_algs_register(struct virtio_crypto *vcrypto);
 145 void virtio_crypto_algs_unregister(struct virtio_crypto *vcrypto);
 146
 147 #endif /* _VIRTIO_CRYPTO_COMMON_H */