xref: /openbmc/linux/net/devlink/devl_internal.h (revision 2a598d0b)
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* Copyright (c) 2016 Mellanox Technologies. All rights reserved.
3  * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
4  */
5 
6 #include <linux/mutex.h>
7 #include <linux/netdevice.h>
8 #include <linux/notifier.h>
9 #include <linux/types.h>
10 #include <linux/workqueue.h>
11 #include <linux/xarray.h>
12 #include <net/devlink.h>
13 #include <net/net_namespace.h>
14 
15 #define DEVLINK_REGISTERED XA_MARK_1
16 
17 #define DEVLINK_RELOAD_STATS_ARRAY_SIZE \
18 	(__DEVLINK_RELOAD_LIMIT_MAX * __DEVLINK_RELOAD_ACTION_MAX)
19 
20 struct devlink_dev_stats {
21 	u32 reload_stats[DEVLINK_RELOAD_STATS_ARRAY_SIZE];
22 	u32 remote_reload_stats[DEVLINK_RELOAD_STATS_ARRAY_SIZE];
23 };
24 
25 struct devlink {
26 	u32 index;
27 	struct xarray ports;
28 	struct list_head rate_list;
29 	struct list_head sb_list;
30 	struct list_head dpipe_table_list;
31 	struct list_head resource_list;
32 	struct xarray params;
33 	struct list_head region_list;
34 	struct list_head reporter_list;
35 	struct devlink_dpipe_headers *dpipe_headers;
36 	struct list_head trap_list;
37 	struct list_head trap_group_list;
38 	struct list_head trap_policer_list;
39 	struct list_head linecard_list;
40 	const struct devlink_ops *ops;
41 	struct xarray snapshot_ids;
42 	struct devlink_dev_stats stats;
43 	struct device *dev;
44 	possible_net_t _net;
45 	/* Serializes access to devlink instance specific objects such as
46 	 * port, sb, dpipe, resource, params, region, traps and more.
47 	 */
48 	struct mutex lock;
49 	struct lock_class_key lock_key;
50 	u8 reload_failed:1;
51 	refcount_t refcount;
52 	struct rcu_work rwork;
53 	char priv[] __aligned(NETDEV_ALIGN);
54 };
55 
56 extern struct xarray devlinks;
57 extern struct genl_family devlink_nl_family;
58 
59 /* devlink instances are open to the access from the user space after
60  * devlink_register() call. Such logical barrier allows us to have certain
61  * expectations related to locking.
62  *
63  * Before *_register() - we are in initialization stage and no parallel
64  * access possible to the devlink instance. All drivers perform that phase
65  * by implicitly holding device_lock.
66  *
67  * After *_register() - users and driver can access devlink instance at
68  * the same time.
69  */
70 #define ASSERT_DEVLINK_REGISTERED(d)                                           \
71 	WARN_ON_ONCE(!xa_get_mark(&devlinks, (d)->index, DEVLINK_REGISTERED))
72 #define ASSERT_DEVLINK_NOT_REGISTERED(d)                                       \
73 	WARN_ON_ONCE(xa_get_mark(&devlinks, (d)->index, DEVLINK_REGISTERED))
74 
75 /* Iterate over devlink pointers which were possible to get reference to.
76  * devlink_put() needs to be called for each iterated devlink pointer
77  * in loop body in order to release the reference.
78  */
79 #define devlinks_xa_for_each_registered_get(net, index, devlink)	\
80 	for (index = 0; (devlink = devlinks_xa_find_get(net, &index)); index++)
81 
82 struct devlink *devlinks_xa_find_get(struct net *net, unsigned long *indexp);
83 
84 static inline bool devl_is_registered(struct devlink *devlink)
85 {
86 	devl_assert_locked(devlink);
87 	return xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED);
88 }
89 
90 /* Netlink */
91 #define DEVLINK_NL_FLAG_NEED_PORT		BIT(0)
92 #define DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT	BIT(1)
93 #define DEVLINK_NL_FLAG_NEED_RATE		BIT(2)
94 #define DEVLINK_NL_FLAG_NEED_RATE_NODE		BIT(3)
95 #define DEVLINK_NL_FLAG_NEED_LINECARD		BIT(4)
96 
97 enum devlink_multicast_groups {
98 	DEVLINK_MCGRP_CONFIG,
99 };
100 
101 /* state held across netlink dumps */
102 struct devlink_nl_dump_state {
103 	unsigned long instance;
104 	int idx;
105 	union {
106 		/* DEVLINK_CMD_REGION_READ */
107 		struct {
108 			u64 start_offset;
109 		};
110 		/* DEVLINK_CMD_HEALTH_REPORTER_DUMP_GET */
111 		struct {
112 			u64 dump_ts;
113 		};
114 	};
115 };
116 
117 struct devlink_cmd {
118 	int (*dump_one)(struct sk_buff *msg, struct devlink *devlink,
119 			struct netlink_callback *cb);
120 };
121 
122 extern const struct genl_small_ops devlink_nl_ops[56];
123 
124 struct devlink *
125 devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs);
126 
127 void devlink_notify_unregister(struct devlink *devlink);
128 void devlink_notify_register(struct devlink *devlink);
129 
130 int devlink_nl_instance_iter_dumpit(struct sk_buff *msg,
131 				    struct netlink_callback *cb);
132 
133 static inline struct devlink_nl_dump_state *
134 devlink_dump_state(struct netlink_callback *cb)
135 {
136 	NL_ASSERT_DUMP_CTX_FITS(struct devlink_nl_dump_state);
137 
138 	return (struct devlink_nl_dump_state *)cb->ctx;
139 }
140 
141 static inline int
142 devlink_nl_put_handle(struct sk_buff *msg, struct devlink *devlink)
143 {
144 	if (nla_put_string(msg, DEVLINK_ATTR_BUS_NAME, devlink->dev->bus->name))
145 		return -EMSGSIZE;
146 	if (nla_put_string(msg, DEVLINK_ATTR_DEV_NAME, dev_name(devlink->dev)))
147 		return -EMSGSIZE;
148 	return 0;
149 }
150 
151 /* Commands */
152 extern const struct devlink_cmd devl_cmd_get;
153 extern const struct devlink_cmd devl_cmd_port_get;
154 extern const struct devlink_cmd devl_cmd_sb_get;
155 extern const struct devlink_cmd devl_cmd_sb_pool_get;
156 extern const struct devlink_cmd devl_cmd_sb_port_pool_get;
157 extern const struct devlink_cmd devl_cmd_sb_tc_pool_bind_get;
158 extern const struct devlink_cmd devl_cmd_param_get;
159 extern const struct devlink_cmd devl_cmd_region_get;
160 extern const struct devlink_cmd devl_cmd_info_get;
161 extern const struct devlink_cmd devl_cmd_health_reporter_get;
162 extern const struct devlink_cmd devl_cmd_trap_get;
163 extern const struct devlink_cmd devl_cmd_trap_group_get;
164 extern const struct devlink_cmd devl_cmd_trap_policer_get;
165 extern const struct devlink_cmd devl_cmd_rate_get;
166 extern const struct devlink_cmd devl_cmd_linecard_get;
167 extern const struct devlink_cmd devl_cmd_selftests_get;
168 
169 /* Notify */
170 void devlink_notify(struct devlink *devlink, enum devlink_command cmd);
171 
172 /* Ports */
173 int devlink_port_netdevice_event(struct notifier_block *nb,
174 				 unsigned long event, void *ptr);
175 
176 struct devlink_port *
177 devlink_port_get_from_info(struct devlink *devlink, struct genl_info *info);
178 struct devlink_port *devlink_port_get_from_attrs(struct devlink *devlink,
179 						 struct nlattr **attrs);
180 
181 /* Reload */
182 bool devlink_reload_actions_valid(const struct devlink_ops *ops);
183 int devlink_reload(struct devlink *devlink, struct net *dest_net,
184 		   enum devlink_reload_action action,
185 		   enum devlink_reload_limit limit,
186 		   u32 *actions_performed, struct netlink_ext_ack *extack);
187 
188 static inline bool devlink_reload_supported(const struct devlink_ops *ops)
189 {
190 	return ops->reload_down && ops->reload_up;
191 }
192 
193 /* Params */
194 void devlink_params_driverinit_load_new(struct devlink *devlink);
195 
196 /* Resources */
197 struct devlink_resource;
198 int devlink_resources_validate(struct devlink *devlink,
199 			       struct devlink_resource *resource,
200 			       struct genl_info *info);
201 
202 /* Line cards */
203 struct devlink_linecard;
204 
205 struct devlink_linecard *
206 devlink_linecard_get_from_info(struct devlink *devlink, struct genl_info *info);
207 
208 /* Rates */
209 int devlink_rate_nodes_check(struct devlink *devlink, u16 mode,
210 			     struct netlink_ext_ack *extack);
211 struct devlink_rate *
212 devlink_rate_get_from_info(struct devlink *devlink, struct genl_info *info);
213 struct devlink_rate *
214 devlink_rate_node_get_from_info(struct devlink *devlink,
215 				struct genl_info *info);
216 /* Devlink nl cmds */
217 int devlink_nl_cmd_get_doit(struct sk_buff *skb, struct genl_info *info);
218 int devlink_nl_cmd_reload(struct sk_buff *skb, struct genl_info *info);
219 int devlink_nl_cmd_eswitch_get_doit(struct sk_buff *skb, struct genl_info *info);
220 int devlink_nl_cmd_eswitch_set_doit(struct sk_buff *skb, struct genl_info *info);
221 int devlink_nl_cmd_info_get_doit(struct sk_buff *skb, struct genl_info *info);
222 int devlink_nl_cmd_flash_update(struct sk_buff *skb, struct genl_info *info);
223 int devlink_nl_cmd_selftests_get_doit(struct sk_buff *skb, struct genl_info *info);
224 int devlink_nl_cmd_selftests_run(struct sk_buff *skb, struct genl_info *info);
225 int devlink_nl_cmd_health_reporter_get_doit(struct sk_buff *skb,
226 					    struct genl_info *info);
227 int devlink_nl_cmd_health_reporter_set_doit(struct sk_buff *skb,
228 					    struct genl_info *info);
229 int devlink_nl_cmd_health_reporter_recover_doit(struct sk_buff *skb,
230 						struct genl_info *info);
231 int devlink_nl_cmd_health_reporter_diagnose_doit(struct sk_buff *skb,
232 						 struct genl_info *info);
233 int devlink_nl_cmd_health_reporter_dump_get_dumpit(struct sk_buff *skb,
234 						   struct netlink_callback *cb);
235 int devlink_nl_cmd_health_reporter_dump_clear_doit(struct sk_buff *skb,
236 						   struct genl_info *info);
237 int devlink_nl_cmd_health_reporter_test_doit(struct sk_buff *skb,
238 					     struct genl_info *info);
239