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