1/*
  2 * include/net/devlink.h - Network physical device Netlink interface
  3 * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
  4 * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU General Public License as published by
  8 * the Free Software Foundation; either version 2 of the License, or
  9 * (at your option) any later version.
 10 */
 11#ifndef _NET_DEVLINK_H_
 12#define _NET_DEVLINK_H_
 13
 14#include <linux/device.h>
 15#include <linux/slab.h>
 16#include <linux/gfp.h>
 17#include <linux/list.h>
 18#include <linux/netdevice.h>
 19#include <net/net_namespace.h>
 20#include <uapi/linux/devlink.h>
 21
 22struct devlink_ops;
 23
 24struct devlink {
 25	struct list_head list;
 26	struct list_head port_list;
 27	const struct devlink_ops *ops;
 28	struct device *dev;
 29	possible_net_t _net;
 30	char priv[0] __aligned(NETDEV_ALIGN);
 31};
 32
 33struct devlink_port {
 34	struct list_head list;
 35	struct devlink *devlink;
 36	unsigned index;
 37	bool registered;
 38	enum devlink_port_type type;
 39	enum devlink_port_type desired_type;
 40	void *type_dev;
 41	bool split;
 42	u32 split_group;
 43};
 44
 45struct devlink_ops {
 46	size_t priv_size;
 47	int (*port_type_set)(struct devlink_port *devlink_port,
 48			     enum devlink_port_type port_type);
 49	int (*port_split)(struct devlink *devlink, unsigned int port_index,
 50			  unsigned int count);
 51	int (*port_unsplit)(struct devlink *devlink, unsigned int port_index);
 52};
 53
 54static inline void *devlink_priv(struct devlink *devlink)
 55{
 56	BUG_ON(!devlink);
 57	return &devlink->priv;
 58}
 59
 60static inline struct devlink *priv_to_devlink(void *priv)
 61{
 62	BUG_ON(!priv);
 63	return container_of(priv, struct devlink, priv);
 64}
 65
 66struct ib_device;
 67
 68#if IS_ENABLED(CONFIG_NET_DEVLINK)
 69
 70struct devlink *devlink_alloc(const struct devlink_ops *ops, size_t priv_size);
 71int devlink_register(struct devlink *devlink, struct device *dev);
 72void devlink_unregister(struct devlink *devlink);
 73void devlink_free(struct devlink *devlink);
 74int devlink_port_register(struct devlink *devlink,
 75			  struct devlink_port *devlink_port,
 76			  unsigned int port_index);
 77void devlink_port_unregister(struct devlink_port *devlink_port);
 78void devlink_port_type_eth_set(struct devlink_port *devlink_port,
 79			       struct net_device *netdev);
 80void devlink_port_type_ib_set(struct devlink_port *devlink_port,
 81			      struct ib_device *ibdev);
 82void devlink_port_type_clear(struct devlink_port *devlink_port);
 83void devlink_port_split_set(struct devlink_port *devlink_port,
 84			    u32 split_group);
 85
 86#else
 87
 88static inline struct devlink *devlink_alloc(const struct devlink_ops *ops,
 89					    size_t priv_size)
 90{
 91	return kzalloc(sizeof(struct devlink) + priv_size, GFP_KERNEL);
 92}
 93
 94static inline int devlink_register(struct devlink *devlink, struct device *dev)
 95{
 96	return 0;
 97}
 98
 99static inline void devlink_unregister(struct devlink *devlink)
100{
101}
102
103static inline void devlink_free(struct devlink *devlink)
104{
105	kfree(devlink);
106}
107
108static inline int devlink_port_register(struct devlink *devlink,
109					struct devlink_port *devlink_port,
110					unsigned int port_index)
111{
112	return 0;
113}
114
115static inline void devlink_port_unregister(struct devlink_port *devlink_port)
116{
117}
118
119static inline void devlink_port_type_eth_set(struct devlink_port *devlink_port,
120					     struct net_device *netdev)
121{
122}
123
124static inline void devlink_port_type_ib_set(struct devlink_port *devlink_port,
125					    struct ib_device *ibdev)
126{
127}
128
129static inline void devlink_port_type_clear(struct devlink_port *devlink_port)
130{
131}
132
133static inline void devlink_port_split_set(struct devlink_port *devlink_port,
134					  u32 split_group)
135{
136}
137
138#endif
139
140#endif /* _NET_DEVLINK_H_ */