summaryrefslogtreecommitdiff
path: root/net/devlink/devl_internal.h
blob: 183dbe3807ab32188add215b2f7bfc9e17e6fbb5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
/* 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 <linux/etherdevice.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/notifier.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#include <linux/xarray.h>
#include <net/devlink.h>
#include <net/net_namespace.h>
#include <net/rtnetlink.h>
#include <rdma/ib_verbs.h>

#include "netlink_gen.h"

struct devlink_rel;

#define DEVLINK_REGISTERED XA_MARK_1

#define DEVLINK_RELOAD_STATS_ARRAY_SIZE \
	(__DEVLINK_RELOAD_LIMIT_MAX * __DEVLINK_RELOAD_ACTION_MAX)

struct devlink_dev_stats {
	u32 reload_stats[DEVLINK_RELOAD_STATS_ARRAY_SIZE];
	u32 remote_reload_stats[DEVLINK_RELOAD_STATS_ARRAY_SIZE];
};

struct devlink {
	u32 index;
	struct xarray ports;
	struct list_head rate_list;
	struct list_head sb_list;
	struct list_head dpipe_table_list;
	struct list_head resource_list;
	struct xarray params;
	struct list_head region_list;
	struct list_head reporter_list;
	struct devlink_dpipe_headers *dpipe_headers;
	struct list_head trap_list;
	struct list_head trap_group_list;
	struct list_head trap_policer_list;
	struct list_head linecard_list;
	const struct devlink_ops *ops;
	struct xarray snapshot_ids;
	struct devlink_dev_stats stats;
	struct device *dev;
	possible_net_t _net;
	/* Serializes access to devlink instance specific objects such as
	 * port, sb, dpipe, resource, params, region, traps and more.
	 */
	struct mutex lock;
	struct lock_class_key lock_key;
	u8 reload_failed:1;
	refcount_t refcount;
	struct rcu_work rwork;
	struct devlink_rel *rel;
	struct xarray nested_rels;
	char priv[] __aligned(NETDEV_ALIGN);
};

extern struct xarray devlinks;
extern struct genl_family devlink_nl_family;

/* devlink instances are open to the access from the user space after
 * devlink_register() call. Such logical barrier allows us to have certain
 * expectations related to locking.
 *
 * Before *_register() - we are in initialization stage and no parallel
 * access possible to the devlink instance. All drivers perform that phase
 * by implicitly holding device_lock.
 *
 * After *_register() - users and driver can access devlink instance at
 * the same time.
 */
#define ASSERT_DEVLINK_REGISTERED(d)                                           \
	WARN_ON_ONCE(!xa_get_mark(&devlinks, (d)->index, DEVLINK_REGISTERED))
#define ASSERT_DEVLINK_NOT_REGISTERED(d)                                       \
	WARN_ON_ONCE(xa_get_mark(&devlinks, (d)->index, DEVLINK_REGISTERED))

/* Iterate over devlink pointers which were possible to get reference to.
 * devlink_put() needs to be called for each iterated devlink pointer
 * in loop body in order to release the reference.
 */
#define devlinks_xa_for_each_registered_get(net, index, devlink)	\
	for (index = 0; (devlink = devlinks_xa_find_get(net, &index)); index++)

struct devlink *devlinks_xa_find_get(struct net *net, unsigned long *indexp);

static inline bool devl_is_registered(struct devlink *devlink)
{
	devl_assert_locked(devlink);
	return xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED);
}

typedef void devlink_rel_notify_cb_t(struct devlink *devlink, u32 obj_index);
typedef void devlink_rel_cleanup_cb_t(struct devlink *devlink, u32 obj_index,
				      u32 rel_index);

void devlink_rel_nested_in_clear(u32 rel_index);
int devlink_rel_nested_in_add(u32 *rel_index, u32 devlink_index,
			      u32 obj_index, devlink_rel_notify_cb_t *notify_cb,
			      devlink_rel_cleanup_cb_t *cleanup_cb,
			      struct devlink *devlink);
void devlink_rel_nested_in_notify(struct devlink *devlink);
int devlink_rel_devlink_handle_put(struct sk_buff *msg, struct devlink *devlink,
				   u32 rel_index, int attrtype,
				   bool *msg_updated);

/* Netlink */
#define DEVLINK_NL_FLAG_NEED_PORT		BIT(0)
#define DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT	BIT(1)

enum devlink_multicast_groups {
	DEVLINK_MCGRP_CONFIG,
};

/* state held across netlink dumps */
struct devlink_nl_dump_state {
	unsigned long instance;
	int idx;
	union {
		/* DEVLINK_CMD_REGION_READ */
		struct {
			u64 start_offset;
		};
		/* DEVLINK_CMD_HEALTH_REPORTER_DUMP_GET */
		struct {
			u64 dump_ts;
		};
	};
};

typedef int devlink_nl_dump_one_func_t(struct sk_buff *msg,
				       struct devlink *devlink,
				       struct netlink_callback *cb,
				       int flags);

struct devlink *
devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs);

int devlink_nl_dumpit(struct sk_buff *msg, struct netlink_callback *cb,
		      devlink_nl_dump_one_func_t *dump_one);

static inline struct devlink_nl_dump_state *
devlink_dump_state(struct netlink_callback *cb)
{
	NL_ASSERT_DUMP_CTX_FITS(struct devlink_nl_dump_state);

	return (struct devlink_nl_dump_state *)cb->ctx;
}

static inline int
devlink_nl_put_handle(struct sk_buff *msg, struct devlink *devlink)
{
	if (nla_put_string(msg, DEVLINK_ATTR_BUS_NAME, devlink->dev->bus->name))
		return -EMSGSIZE;
	if (nla_put_string(msg, DEVLINK_ATTR_DEV_NAME, dev_name(devlink->dev)))
		return -EMSGSIZE;
	return 0;
}

int devlink_nl_put_nested_handle(struct sk_buff *msg, struct net *net,
				 struct devlink *devlink, int attrtype);
int devlink_nl_msg_reply_and_new(struct sk_buff **msg, struct genl_info *info);

/* Notify */
void devlink_notify_register(struct devlink *devlink);
void devlink_notify_unregister(struct devlink *devlink);
void devlink_ports_notify_register(struct devlink *devlink);
void devlink_ports_notify_unregister(struct devlink *devlink);
void devlink_params_notify_register(struct devlink *devlink);
void devlink_params_notify_unregister(struct devlink *devlink);
void devlink_regions_notify_register(struct devlink *devlink);
void devlink_regions_notify_unregister(struct devlink *devlink);
void devlink_trap_policers_notify_register(struct devlink *devlink);
void devlink_trap_policers_notify_unregister(struct devlink *devlink);
void devlink_trap_groups_notify_register(struct devlink *devlink);
void devlink_trap_groups_notify_unregister(struct devlink *devlink);
void devlink_traps_notify_register(struct devlink *devlink);
void devlink_traps_notify_unregister(struct devlink *devlink);
void devlink_rates_notify_register(struct devlink *devlink);
void devlink_rates_notify_unregister(struct devlink *devlink);
void devlink_linecards_notify_register(struct devlink *devlink);
void devlink_linecards_notify_unregister(struct devlink *devlink);

/* Ports */
#define ASSERT_DEVLINK_PORT_INITIALIZED(devlink_port)				\
	WARN_ON_ONCE(!(devlink_port)->initialized)

struct devlink_port *devlink_port_get_by_index(struct devlink *devlink,
					       unsigned int port_index);
int devlink_port_netdevice_event(struct notifier_block *nb,
				 unsigned long event, void *ptr);
struct devlink_port *
devlink_port_get_from_info(struct devlink *devlink, struct genl_info *info);
struct devlink_port *devlink_port_get_from_attrs(struct devlink *devlink,
						 struct nlattr **attrs);

/* Reload */
bool devlink_reload_actions_valid(const struct devlink_ops *ops);
int devlink_reload(struct devlink *devlink, struct net *dest_net,
		   enum devlink_reload_action action,
		   enum devlink_reload_limit limit,
		   u32 *actions_performed, struct netlink_ext_ack *extack);

static inline bool devlink_reload_supported(const struct devlink_ops *ops)
{
	return ops->reload_down && ops->reload_up;
}

/* Params */
void devlink_params_driverinit_load_new(struct devlink *devlink);

/* Resources */
struct devlink_resource;
int devlink_resources_validate(struct devlink *devlink,
			       struct devlink_resource *resource,
			       struct genl_info *info);

/* Rates */
int devlink_rate_nodes_check(struct devlink *devlink, u16 mode,
			     struct netlink_ext_ack *extack);

/* Linecards */
unsigned int devlink_linecard_index(struct devlink_linecard *linecard);