/*
 * QEMU Crypto Device Implementation
 *
 * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
 *
 * Authors:
 *    Gonglei <arei.gonglei@huawei.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "qemu/osdep.h"
#include "sysemu/cryptodev.h"
#include "qapi/error.h"
#include "qapi/visitor.h"
#include "qemu/config-file.h"
#include "qom/object_interfaces.h"
#include "hw/virtio/virtio-crypto.h"


static QTAILQ_HEAD(, CryptoDevBackendClient) crypto_clients;


CryptoDevBackendClient *
cryptodev_backend_new_client(const char *model,
                                    const char *name)
{
    CryptoDevBackendClient *cc;

    cc = g_new0(CryptoDevBackendClient, 1);
    cc->model = g_strdup(model);
    if (name) {
        cc->name = g_strdup(name);
    }

    QTAILQ_INSERT_TAIL(&crypto_clients, cc, next);

    return cc;
}

void cryptodev_backend_free_client(
                  CryptoDevBackendClient *cc)
{
    QTAILQ_REMOVE(&crypto_clients, cc, next);
    g_free(cc->name);
    g_free(cc->model);
    g_free(cc->info_str);
    g_free(cc);
}

void cryptodev_backend_cleanup(
             CryptoDevBackend *backend,
             Error **errp)
{
    CryptoDevBackendClass *bc =
                  CRYPTODEV_BACKEND_GET_CLASS(backend);

    if (bc->cleanup) {
        bc->cleanup(backend, errp);
    }
}

int64_t cryptodev_backend_create_session(
           CryptoDevBackend *backend,
           CryptoDevBackendSessionInfo *sess_info,
           uint32_t queue_index, Error **errp)
{
    CryptoDevBackendClass *bc =
                      CRYPTODEV_BACKEND_GET_CLASS(backend);

    if (bc->create_session) {
        return bc->create_session(backend, sess_info, queue_index, errp);
    }

    return -1;
}

int cryptodev_backend_close_session(
           CryptoDevBackend *backend,
           uint64_t session_id,
           uint32_t queue_index, Error **errp)
{
    CryptoDevBackendClass *bc =
                      CRYPTODEV_BACKEND_GET_CLASS(backend);

    if (bc->close_session) {
        return bc->close_session(backend, session_id, queue_index, errp);
    }

    return -1;
}

static int cryptodev_backend_operation(
                 CryptoDevBackend *backend,
                 CryptoDevBackendOpInfo *op_info,
                 uint32_t queue_index, Error **errp)
{
    CryptoDevBackendClass *bc =
                      CRYPTODEV_BACKEND_GET_CLASS(backend);

    if (bc->do_op) {
        return bc->do_op(backend, op_info, queue_index, errp);
    }

    return -VIRTIO_CRYPTO_ERR;
}

int cryptodev_backend_crypto_operation(
                 CryptoDevBackend *backend,
                 void *opaque,
                 uint32_t queue_index, Error **errp)
{
    VirtIOCryptoReq *req = opaque;
    CryptoDevBackendOpInfo *op_info = &req->op_info;
    enum CryptoDevBackendAlgType algtype = req->flags;

    if ((algtype != CRYPTODEV_BACKEND_ALG_SYM)
        && (algtype != CRYPTODEV_BACKEND_ALG_ASYM)) {
        error_setg(errp, "Unsupported cryptodev alg type: %" PRIu32 "",
                   algtype);

        return -VIRTIO_CRYPTO_NOTSUPP;
    }

    return cryptodev_backend_operation(backend, op_info, queue_index, errp);
}

static void
cryptodev_backend_get_queues(Object *obj, Visitor *v, const char *name,
                             void *opaque, Error **errp)
{
    CryptoDevBackend *backend = CRYPTODEV_BACKEND(obj);
    uint32_t value = backend->conf.peers.queues;

    visit_type_uint32(v, name, &value, errp);
}

static void
cryptodev_backend_set_queues(Object *obj, Visitor *v, const char *name,
                             void *opaque, Error **errp)
{
    CryptoDevBackend *backend = CRYPTODEV_BACKEND(obj);
    uint32_t value;

    if (!visit_type_uint32(v, name, &value, errp)) {
        return;
    }
    if (!value) {
        error_setg(errp, "Property '%s.%s' doesn't take value '%" PRIu32 "'",
                   object_get_typename(obj), name, value);
        return;
    }
    backend->conf.peers.queues = value;
}

static void
cryptodev_backend_complete(UserCreatable *uc, Error **errp)
{
    CryptoDevBackend *backend = CRYPTODEV_BACKEND(uc);
    CryptoDevBackendClass *bc = CRYPTODEV_BACKEND_GET_CLASS(uc);

    if (bc->init) {
        bc->init(backend, errp);
    }
}

void cryptodev_backend_set_used(CryptoDevBackend *backend, bool used)
{
    backend->is_used = used;
}

bool cryptodev_backend_is_used(CryptoDevBackend *backend)
{
    return backend->is_used;
}

void cryptodev_backend_set_ready(CryptoDevBackend *backend, bool ready)
{
    backend->ready = ready;
}

bool cryptodev_backend_is_ready(CryptoDevBackend *backend)
{
    return backend->ready;
}

static bool
cryptodev_backend_can_be_deleted(UserCreatable *uc)
{
    return !cryptodev_backend_is_used(CRYPTODEV_BACKEND(uc));
}

static void cryptodev_backend_instance_init(Object *obj)
{
    /* Initialize devices' queues property to 1 */
    object_property_set_int(obj, "queues", 1, NULL);
}

static void cryptodev_backend_finalize(Object *obj)
{
    CryptoDevBackend *backend = CRYPTODEV_BACKEND(obj);

    cryptodev_backend_cleanup(backend, NULL);
}

static void
cryptodev_backend_class_init(ObjectClass *oc, void *data)
{
    UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);

    ucc->complete = cryptodev_backend_complete;
    ucc->can_be_deleted = cryptodev_backend_can_be_deleted;

    QTAILQ_INIT(&crypto_clients);
    object_class_property_add(oc, "queues", "uint32",
                              cryptodev_backend_get_queues,
                              cryptodev_backend_set_queues,
                              NULL, NULL);
}

static const TypeInfo cryptodev_backend_info = {
    .name = TYPE_CRYPTODEV_BACKEND,
    .parent = TYPE_OBJECT,
    .instance_size = sizeof(CryptoDevBackend),
    .instance_init = cryptodev_backend_instance_init,
    .instance_finalize = cryptodev_backend_finalize,
    .class_size = sizeof(CryptoDevBackendClass),
    .class_init = cryptodev_backend_class_init,
    .interfaces = (InterfaceInfo[]) {
        { TYPE_USER_CREATABLE },
        { }
    }
};

static void
cryptodev_backend_register_types(void)
{
    type_register_static(&cryptodev_backend_info);
}

type_init(cryptodev_backend_register_types);