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
  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
  42 struct virtio_crypto {
  43         struct virtio_device *vdev;
  44         struct virtqueue *ctrl_vq;
  45         struct data_queue *data_vq;
  46
  47         /* To protect the vq operations for the controlq */
  48         spinlock_t ctrl_lock;
  49
  50         /* Maximum of data queues supported by the device */
  51         u32 max_data_queues;
  52
  53         /* Number of queue currently used by the driver */
  54         u32 curr_queue;
  55
  56         /* Maximum length of cipher key */
  57         u32 max_cipher_key_len;
  58         /* Maximum length of authenticated key */
  59         u32 max_auth_key_len;
  60         /* Maximum size of per request */
  61         u64 max_size;
  62
  63         /* Control VQ buffers: protected by the ctrl_lock */
  64         struct virtio_crypto_op_ctrl_req ctrl;
  65         struct virtio_crypto_session_input input;
  66         struct virtio_crypto_inhdr ctrl_status;
  67
  68         unsigned long status;
  69         atomic_t ref_count;
  70         struct list_head list;
  71         struct module *owner;
  72         uint8_t dev_id;
  73
  74         /* Does the affinity hint is set for virtqueues? */
  75         bool affinity_hint_set;
  76 };
  77
  78 struct virtio_crypto_sym_session_info {
  79         /* Backend session id, which come from the host side */
  80         __u64 session_id;
  81 };
  82
  83 struct virtio_crypto_ablkcipher_ctx {
  84         struct virtio_crypto *vcrypto;
  85         struct crypto_tfm *tfm;
  86
  87         struct virtio_crypto_sym_session_info enc_sess_info;
  88         struct virtio_crypto_sym_session_info dec_sess_info;
  89 };
  90
  91 struct virtio_crypto_request {
  92         /* Cipher or aead */
  93         uint32_t type;
  94         uint8_t status;
  95         struct virtio_crypto_ablkcipher_ctx *ablkcipher_ctx;
  96         struct ablkcipher_request *ablkcipher_req;
  97         struct virtio_crypto_op_data_req *req_data;
  98         struct scatterlist **sgs;
  99         uint8_t *iv;
 100 };
 101
 102 int virtcrypto_devmgr_add_dev(struct virtio_crypto *vcrypto_dev);
 103 struct list_head *virtcrypto_devmgr_get_head(void);
 104 void virtcrypto_devmgr_rm_dev(struct virtio_crypto *vcrypto_dev);
 105 struct virtio_crypto *virtcrypto_devmgr_get_first(void);
 106 int virtcrypto_dev_in_use(struct virtio_crypto *vcrypto_dev);
 107 int virtcrypto_dev_get(struct virtio_crypto *vcrypto_dev);
 108 void virtcrypto_dev_put(struct virtio_crypto *vcrypto_dev);
 109 int virtcrypto_dev_started(struct virtio_crypto *vcrypto_dev);
 110 struct virtio_crypto *virtcrypto_get_dev_node(int node);
 111 int virtcrypto_dev_start(struct virtio_crypto *vcrypto);
 112 void virtcrypto_dev_stop(struct virtio_crypto *vcrypto);
 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 */