path: root/net/devlink/region.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
 */

#include "devl_internal.h"

struct devlink_region {
	struct devlink *devlink;
	struct devlink_port *port;
	struct list_head list;
	union {
		const struct devlink_region_ops *ops;
		const struct devlink_port_region_ops *port_ops;
	};
	struct mutex snapshot_lock; /* protects snapshot_list,
				     * max_snapshots and cur_snapshots
				     * consistency.
				     */
	struct list_head snapshot_list;
	u32 max_snapshots;
	u32 cur_snapshots;
	u64 size;
};

struct devlink_snapshot {
	struct list_head list;
	struct devlink_region *region;
	u8 *data;
	u32 id;
};

static struct devlink_region *
devlink_region_get_by_name(struct devlink *devlink, const char *region_name)
{
	struct devlink_region *region;

	list_for_each_entry(region, &devlink->region_list, list)
		if (!strcmp(region->ops->name, region_name))
			return region;

	return NULL;
}

static struct devlink_region *
devlink_port_region_get_by_name(struct devlink_port *port,
				const char *region_name)
{
	struct devlink_region *region;

	list_for_each_entry(region, &port->region_list, list)
		if (!strcmp(region->ops->name, region_name))
			return region;

	return NULL;
}

static struct devlink_snapshot *
devlink_region_snapshot_get_by_id(struct devlink_region *region, u32 id)
{
	struct devlink_snapshot *snapshot;

	list_for_each_entry(snapshot, &region->snapshot_list, list)
		if (snapshot->id == id)
			return snapshot;

	return NULL;
}

static int devlink_nl_region_snapshot_id_put(struct sk_buff *msg,
					     struct devlink *devlink,
					     struct devlink_snapshot *snapshot)
{
	struct nlattr *snap_attr;
	int err;

	snap_attr = nla_nest_start_noflag(msg, DEVLINK_ATTR_REGION_SNAPSHOT);
	if (!snap_attr)
		return -EINVAL;

	err = nla_put_u32(msg, DEVLINK_ATTR_REGION_SNAPSHOT_ID, snapshot->id);
	if (err)
		goto nla_put_failure;

	nla_nest_end(msg, snap_attr);
	return 0;

nla_put_failure:
	nla_nest_cancel(msg, snap_attr);
	return err;
}

static int devlink_nl_region_snapshots_id_put(struct sk_buff *msg,
					      struct devlink *devlink,
					      struct devlink_region *region)
{
	struct devlink_snapshot *snapshot;
	struct nlattr *snapshots_attr;
	int err;

	snapshots_attr = nla_nest_start_noflag(msg,
					       DEVLINK_ATTR_REGION_SNAPSHOTS);
	if (!snapshots_attr)
		return -EINVAL;

	list_for_each_entry(snapshot, &region->snapshot_list, list) {
		err = devlink_nl_region_snapshot_id_put(msg, devlink, snapshot);
		if (err)
			goto nla_put_failure;
	}

	nla_nest_end(msg, snapshots_attr);
	return 0;

nla_put_failure:
	nla_nest_cancel(msg, snapshots_attr);
	return err;
}

static int devlink_nl_region_fill(struct sk_buff *msg, struct devlink *devlink,
				  enum devlink_command cmd, u32 portid,
				  u32 seq, int flags,
				  struct devlink_region *region)
{
	void *hdr;
	int