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         /* Maximum length of cipher key */
  59         u32 max_cipher_key_len;
  60         /* Maximum length of authenticated key */
  61         u32 max_auth_key_len;
  62         /* Maximum size of per request */
  63         u64 max_size;
  64
  65         /* Control VQ buffers: protected by the ctrl_lock */
  66         struct virtio_crypto_op_ctrl_req ctrl;
  67         struct virtio_crypto_session_input input;
  68         struct virtio_crypto_inhdr ctrl_status;
  69
  70         unsigned long status;
  71         atomic_t ref_count;
  72         struct list_head list;
  73         struct module *owner;
  74         uint8_t dev_id;
  75
  76         /* Does the affinity hint is set for virtqueues? */
  77         bool affinity_hint_set;
  78 };
  79
  80 struct virtio_crypto_sym_session_info {
  81         /* Backend session id, which come from the host side */
  82         __u64 session_id;
  83 };
  84
  85 struct virtio_crypto_request;
  86 typedef void (*virtio_crypto_data_callback)
  87                 (struct virtio_crypto_request *vc_req, int len);
  88
  89 struct virtio_crypto_request {
  90         uint8_t status;
  91         struct virtio_crypto_op_data_req *req_data;
  92         struct scatterlist **sgs;
  93         struct data_queue *dataq;
  94         virtio_crypto_data_callback alg_cb;
  95 };
  96
  97 int virtcrypto_devmgr_add_dev(struct virtio_crypto *vcrypto_dev);
  98 struct list_head *virtcrypto_devmgr_get_head(void);
  99 void virtcrypto_devmgr_rm_dev(struct virtio_crypto *vcrypto_dev);
 100 struct virtio_crypto *virtcrypto_devmgr_get_first(void);
 101 int virtcrypto_dev_in_use(struct virtio_crypto *vcrypto_dev);
 102 int virtcrypto_dev_get(struct virtio_crypto *vcrypto_dev);
 103 void virtcrypto_dev_put(struct virtio_crypto *vcrypto_dev);
 104 int virtcrypto_dev_started(struct virtio_crypto *vcrypto_dev);
 105 struct virtio_crypto *virtcrypto_get_dev_node(int node);
 106 int virtcrypto_dev_start(struct virtio_crypto *vcrypto);
 107 void virtcrypto_dev_stop(struct virtio_crypto *vcrypto);
 108 int virtio_crypto_ablkcipher_crypt_req(
 109         struct crypto_engine *engine, void *vreq);
 110
 111 void
 112 virtcrypto_clear_request(struct virtio_crypto_request *vc_req);
 113
 114 static inline int virtio_crypto_get_current_node(void)
 115 {
 116         int cpu, node;
 117
 118         cpu = get_cpu();
 119         node = topology_physical_package_id(cpu);
 120         put_cpu();
 121
 122         return node;
 123 }
 124
 125 int virtio_crypto_algs_register(void);
 126 void virtio_crypto_algs_unregister(void);
 127
 128 #endif /* _VIRTIO_CRYPTO_COMMON_H */