// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
 * Copyright (c) 2018, Mellanox Technologies inc.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "rdma_core.h"
#include "uverbs.h"
#include <rdma/uverbs_std_types.h>

static int uverbs_free_counters(struct ib_uobject *uobject,
                                enum rdma_remove_reason why,
                                struct uverbs_attr_bundle *attrs)
{
        struct ib_counters *counters = uobject->object;
        int ret;

        if (atomic_read(&counters->usecnt))
                return -EBUSY;

        ret = counters->device->ops.destroy_counters(counters);
        if (ret)
                return ret;
        kfree(counters);
        return 0;
}

static int UVERBS_HANDLER(UVERBS_METHOD_COUNTERS_CREATE)(
        struct uverbs_attr_bundle *attrs)
{
        struct ib_uobject *uobj = uverbs_attr_get_uobject(
                attrs, UVERBS_ATTR_CREATE_COUNTERS_HANDLE);
        struct ib_device *ib_dev = attrs->context->device;
        struct ib_counters *counters;
        int ret;

        /*
         * This check should be removed once the infrastructure
         * have the ability to remove methods from parse tree once
         * such condition is met.
         */
        if (!ib_dev->ops.create_counters)
                return -EOPNOTSUPP;

        counters = rdma_zalloc_drv_obj(ib_dev, ib_counters);
        if (!counters)
                return -ENOMEM;

        counters->device = ib_dev;
        counters->uobject = uobj;
        uobj->object = counters;
        atomic_set(&counters->usecnt, 0);

        ret = ib_dev->ops.create_counters(counters, attrs);
        if (ret)
                kfree(counters);

        return ret;
}

static int UVERBS_HANDLER(UVERBS_METHOD_COUNTERS_READ)(
        struct uverbs_attr_bundle *attrs)
{
        struct ib_counters_read_attr read_attr = {};
        const struct uverbs_attr *uattr;
        struct ib_counters *counters =
                uverbs_attr_get_obj(attrs, UVERBS_ATTR_READ_COUNTERS_HANDLE);
        int ret;

        if (!counters->device->ops.read_counters)
                return -EOPNOTSUPP;

        if (!atomic_read(&counters->usecnt))
                return -EINVAL;

        ret = uverbs_get_flags32(&read_attr.flags, attrs,
                                 UVERBS_ATTR_READ_COUNTERS_FLAGS,
                                 IB_UVERBS_READ_COUNTERS_PREFER_CACHED);
        if (ret)
                return ret;

        uattr = uverbs_attr_get(attrs, UVERBS_ATTR_READ_COUNTERS_BUFF);
        if (IS_ERR(uattr))
                return PTR_ERR(uattr);
        read_attr.ncounters = uattr->ptr_attr.len / sizeof(u64);
        read_attr.counters_buff = uverbs_zalloc(
                attrs, array_size(read_attr.ncounters, sizeof(u64)));
        if (IS_ERR(read_attr.counters_buff))
                return PTR_ERR(read_attr.counters_buff);

        ret = counters->device->ops.read_counters(counters, &read_attr, attrs);
        if (ret)
                return ret;

        return uverbs_copy_to(attrs, UVERBS_ATTR_READ_COUNTERS_BUFF,
                              read_attr.counters_buff,
                              read_attr.ncounters * sizeof(u64));
}

DECLARE_UVERBS_NAMED_METHOD(
        UVERBS_METHOD_COUNTERS_CREATE,
        UVERBS_ATTR_IDR(UVERBS_ATTR_CREATE_COUNTERS_HANDLE,
                        UVERBS_OBJECT_COUNTERS,
                        UVERBS_ACCESS_NEW,
                        UA_MANDATORY));

DECLARE_UVERBS_NAMED_METHOD_DESTROY(
        UVERBS_METHOD_COUNTERS_DESTROY,
        UVERBS_ATTR_IDR(UVERBS_ATTR_DESTROY_COUNTERS_HANDLE,
                        UVERBS_OBJECT_COUNTERS,
                        UVERBS_ACCESS_DESTROY,
                        UA_MANDATORY));

DECLARE_UVERBS_NAMED_METHOD(
        UVERBS_METHOD_COUNTERS_READ,
        UVERBS_ATTR_IDR(UVERBS_ATTR_READ_COUNTERS_HANDLE,
                        UVERBS_OBJECT_COUNTERS,
                        UVERBS_ACCESS_READ,
                        UA_MANDATORY),
        UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_READ_COUNTERS_BUFF,
                            UVERBS_ATTR_MIN_SIZE(0),
                            UA_MANDATORY),
        UVERBS_ATTR_FLAGS_IN(UVERBS_ATTR_READ_COUNTERS_FLAGS,
                             enum ib_uverbs_read_counters_flags));

DECLARE_UVERBS_NAMED_OBJECT(UVERBS_OBJECT_COUNTERS,
                            UVERBS_TYPE_ALLOC_IDR(uverbs_free_counters),
                            &UVERBS_METHOD(UVERBS_METHOD_COUNTERS_CREATE),
                            &UVERBS_METHOD(UVERBS_METHOD_COUNTERS_DESTROY),
                            &UVERBS_METHOD(UVERBS_METHOD_COUNTERS_READ));

const struct uapi_definition uverbs_def_obj_counters[] = {
        UAPI_DEF_CHAIN_OBJ_TREE_NAMED(UVERBS_OBJECT_COUNTERS,
                                      UAPI_DEF_OBJ_NEEDS_FN(destroy_counters)),
        {}
};