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/* Common header for Virtio crypto device.
*
* Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _VIRTIO_CRYPTO_COMMON_H
#define _VIRTIO_CRYPTO_COMMON_H
#include <linux/virtio.h>
#include <linux/crypto.h>
#include <linux/spinlock.h>
#include <crypto/aead.h>
#include <crypto/aes.h>
#include <crypto/authenc.h>
#include <crypto/engine.h>
/* Internal representation of a data virtqueue */
struct data_queue {
/* Virtqueue associated with this send _queue */
struct virtqueue *vq;
/* To protect the vq operations for the dataq */
spinlock_t lock;
/* Name of the tx queue: dataq.$index */
char name[32];
struct crypto_engine *engine;
};
struct virtio_crypto {
struct virtio_device *vdev;
struct virtqueue *ctrl_vq;
struct data_queue *data_vq;
/* To protect the vq operations for the controlq */
spinlock_t ctrl_lock;
/* Maximum of data queues supported by the device */
u32 max_data_queues;
/* Number of queue currently used by the driver */
u32 curr_queue;
/* Maximum length of cipher key */
u32 max_cipher_key_len;
/* Maximum length of authenticated key */
u32 max_auth_key_len;
/* Maximum size of per request */
u64 max_size;
/* Control VQ buffers: protected by the ctrl_lock */
struct virtio_crypto_op_ctrl_req ctrl;
struct virtio_crypto_session_input input;
struct virtio_crypto_inhdr ctrl_status;
unsigned long status;
atomic_t ref_count;
struct list_head list;
struct module *owner;
uint8_t dev_id;
/* Does the affinity hint is set for virtqueues? */
bool affinity_hint_set;
};
struct virtio_crypto_sym_session_info {
/* Backend session id, which come from the host side */
__u64 session_id;
};
struct virtio_crypto_ablkcipher_ctx {
struct virtio_crypto *vcrypto;
struct crypto_tfm *tfm;
struct virtio_crypto_sym_session_info enc_sess_info;
struct virtio_crypto_sym_session_info dec_sess_info;
};
struct virtio_crypto_request {
/* Cipher or aead */
uint32_t type;
uint8_t status;
struct virtio_crypto_ablkcipher_ctx *ablkcipher_ctx;
struct ablkcipher_request *ablkcipher_req;
struct virtio_crypto_op_data_req *req_data;
struct scatterlist **sgs;
uint8_t *iv;
/* Encryption? */
bool encrypt;
struct data_queue *dataq;
};
int virtcrypto_devmgr_add_dev(struct virtio_crypto *vcrypto_dev);
struct list_head *virtcrypto_devmgr_get_head(void);
void virtcrypto_devmgr_rm_dev(struct virtio_crypto *vcrypto_dev);
struct virtio_crypto *virtcrypto_devmgr_get_first(void);
int virtcrypto_dev_in_use(struct virtio_crypto *vcrypto_dev);
int virtcrypto_dev_get(struct virtio_crypto *vcrypto_dev);
void virtcrypto_dev_put(struct virtio_crypto *vcrypto_dev);
int virtcrypto_dev_started(struct virtio_crypto *vcrypto_dev);
struct virtio_crypto *virtcrypto_get_dev_node(int node);
int virtcrypto_dev_start(struct virtio_crypto *vcrypto);
void virtcrypto_dev_stop(struct virtio_crypto *vcrypto);
int virtio_crypto_ablkcipher_crypt_req(
struct crypto_engine *engine,
struct ablkcipher_request *req);
void virtio_crypto_ablkcipher_finalize_req(
struct virtio_crypto_request *vc_req,
struct ablkcipher_request *req,
int err);
void
virtcrypto_clear_request(struct virtio_crypto_request *vc_req);
static inline int virtio_crypto_get_current_node(void)
{
int cpu, node;
cpu = get_cpu();
node = topology_physical_package_id(cpu);
put_cpu();
return node;
}
int virtio_crypto_algs_register(void);
void virtio_crypto_algs_unregister(void);
#endif /* _VIRTIO_CRYPTO_COMMON_H */
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