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/etherdevice.h>
7 #include <linux/mutex.h>
8 #include <linux/netdevice.h>
9 #include <linux/notifier.h>
10 #include <linux/types.h>
11 #include <linux/workqueue.h>
12 #include <linux/xarray.h>
13 #include <net/devlink.h>
14 #include <net/net_namespace.h>
15 #include <net/rtnetlink.h>
16 #include <rdma/ib_verbs.h>
17
18 #include "netlink_gen.h"
19
20 #define DEVLINK_REGISTERED XA_MARK_1
21
22 #define DEVLINK_RELOAD_STATS_ARRAY_SIZE \
23 (__DEVLINK_RELOAD_LIMIT_MAX * __DEVLINK_RELOAD_ACTION_MAX)
24
25 struct devlink_dev_stats {
26 u32 reload_stats[DEVLINK_RELOAD_STATS_ARRAY_SIZE];
27 u32 remote_reload_stats[DEVLINK_RELOAD_STATS_ARRAY_SIZE];
28 };
29
30 struct devlink {
31 u32 index;
32 struct xarray ports;
33 struct list_head rate_list;
34 struct list_head sb_list;
35 struct list_head dpipe_table_list;
36 struct list_head resource_list;
37 struct xarray params;
38 struct list_head region_list;
39 struct list_head reporter_list;
40 struct devlink_dpipe_headers *dpipe_headers;
41 struct list_head trap_list;
42 struct list_head trap_group_list;
43 struct list_head trap_policer_list;
44 struct list_head linecard_list;
45 const struct devlink_ops *ops;
46 struct xarray snapshot_ids;
47 struct devlink_dev_stats stats;
48 struct device *dev;
49 possible_net_t _net;
50 /* Serializes access to devlink instance specific objects such as
51 * port, sb, dpipe, resource, params, region, traps and more.
52 */
53 struct mutex lock;
54 struct lock_class_key lock_key;
55 u8 reload_failed:1;
56 refcount_t refcount;
57 struct rcu_work rwork;
58 char priv[] __aligned(NETDEV_ALIGN);
59 };
60
61 extern struct xarray devlinks;
62 extern struct genl_family devlink_nl_family;
63
64 /* devlink instances are open to the access from the user space after
65 * devlink_register() call. Such logical barrier allows us to have certain
66 * expectations related to locking.
67 *
68 * Before *_register() - we are in initialization stage and no parallel
69 * access possible to the devlink instance. All drivers perform that phase
70 * by implicitly holding device_lock.
71 *
72 * After *_register() - users and driver can access devlink instance at
73 * the same time.
74 */
75 #define ASSERT_DEVLINK_REGISTERED(d) \
76 WARN_ON_ONCE(!xa_get_mark(&devlinks, (d)->index, DEVLINK_REGISTERED))
77 #define ASSERT_DEVLINK_NOT_REGISTERED(d) \
78 WARN_ON_ONCE(xa_get_mark(&devlinks, (d)->index, DEVLINK_REGISTERED))
79
80 /* Iterate over devlink pointers which were possible to get reference to.
81 * devlink_put() needs to be called for each iterated devlink pointer
82 * in loop body in order to release the reference.
83 */
84 #define devlinks_xa_for_each_registered_get(net, index, devlink) \
85 for (index = 0; (devlink = devlinks_xa_find_get(net, &index)); index++)
86
87 struct devlink *devlinks_xa_find_get(struct net *net, unsigned long *indexp);
88
devl_is_registered(struct devlink * devlink)89 static inline bool devl_is_registered(struct devlink *devlink)
90 {
91 devl_assert_locked(devlink);
92 return xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED);
93 }
94
95 /* Netlink */
96 #define DEVLINK_NL_FLAG_NEED_PORT BIT(0)
97 #define DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT BIT(1)
98
99 enum devlink_multicast_groups {
100 DEVLINK_MCGRP_CONFIG,
101 };
102
103 /* state held across netlink dumps */
104 struct devlink_nl_dump_state {
105 unsigned long instance;
106 int idx;
107 union {
108 /* DEVLINK_CMD_REGION_READ */
109 struct {
110 u64 start_offset;
111 };
112 /* DEVLINK_CMD_HEALTH_REPORTER_DUMP_GET */
113 struct {
114 u64 dump_ts;
115 };
116 };
117 };
118
119 typedef int devlink_nl_dump_one_func_t(struct sk_buff *msg,
120 struct devlink *devlink,
121 struct netlink_callback *cb,
122 int flags);
123
124 struct devlink *
125 devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs);
126
127 int devlink_nl_dumpit(struct sk_buff *msg, struct netlink_callback *cb,
128 devlink_nl_dump_one_func_t *dump_one);
129
130 static inline struct devlink_nl_dump_state *
devlink_dump_state(struct netlink_callback * cb)131 devlink_dump_state(struct netlink_callback *cb)
132 {
133 NL_ASSERT_DUMP_CTX_FITS(struct devlink_nl_dump_state);
134
135 return (struct devlink_nl_dump_state *)cb->ctx;
136 }
137
138 static inline int
devlink_nl_put_handle(struct sk_buff * msg,struct devlink * devlink)139 devlink_nl_put_handle(struct sk_buff *msg, struct devlink *devlink)
140 {
141 if (nla_put_string(msg, DEVLINK_ATTR_BUS_NAME, devlink->dev->bus->name))
142 return -EMSGSIZE;
143 if (nla_put_string(msg, DEVLINK_ATTR_DEV_NAME, dev_name(devlink->dev)))
144 return -EMSGSIZE;
145 return 0;
146 }
147
148 int devlink_nl_msg_reply_and_new(struct sk_buff **msg, struct genl_info *info);
149
150 /* Notify */
151 void devlink_notify_register(struct devlink *devlink);
152 void devlink_notify_unregister(struct devlink *devlink);
153 void devlink_ports_notify_register(struct devlink *devlink);
154 void devlink_ports_notify_unregister(struct devlink *devlink);
155 void devlink_params_notify_register(struct devlink *devlink);
156 void devlink_params_notify_unregister(struct devlink *devlink);
157 void devlink_regions_notify_register(struct devlink *devlink);
158 void devlink_regions_notify_unregister(struct devlink *devlink);
159 void devlink_trap_policers_notify_register(struct devlink *devlink);
160 void devlink_trap_policers_notify_unregister(struct devlink *devlink);
161 void devlink_trap_groups_notify_register(struct devlink *devlink);
162 void devlink_trap_groups_notify_unregister(struct devlink *devlink);
163 void devlink_traps_notify_register(struct devlink *devlink);
164 void devlink_traps_notify_unregister(struct devlink *devlink);
165 void devlink_rates_notify_register(struct devlink *devlink);
166 void devlink_rates_notify_unregister(struct devlink *devlink);
167 void devlink_linecards_notify_register(struct devlink *devlink);
168 void devlink_linecards_notify_unregister(struct devlink *devlink);
169
170 /* Ports */
171 #define ASSERT_DEVLINK_PORT_INITIALIZED(devlink_port) \
172 WARN_ON_ONCE(!(devlink_port)->initialized)
173
174 struct devlink_port *devlink_port_get_by_index(struct devlink *devlink,
175 unsigned int port_index);
176 int devlink_port_netdevice_event(struct notifier_block *nb,
177 unsigned long event, void *ptr);
178 struct devlink_port *
179 devlink_port_get_from_info(struct devlink *devlink, struct genl_info *info);
180 struct devlink_port *devlink_port_get_from_attrs(struct devlink *devlink,
181 struct nlattr **attrs);
182
183 /* Reload */
184 bool devlink_reload_actions_valid(const struct devlink_ops *ops);
185 int devlink_reload(struct devlink *devlink, struct net *dest_net,
186 enum devlink_reload_action action,
187 enum devlink_reload_limit limit,
188 u32 *actions_performed, struct netlink_ext_ack *extack);
189
devlink_reload_supported(const struct devlink_ops * ops)190 static inline bool devlink_reload_supported(const struct devlink_ops *ops)
191 {
192 return ops->reload_down && ops->reload_up;
193 }
194
195 /* Params */
196 void devlink_params_driverinit_load_new(struct devlink *devlink);
197
198 /* Resources */
199 struct devlink_resource;
200 int devlink_resources_validate(struct devlink *devlink,
201 struct devlink_resource *resource,
202 struct genl_info *info);
203
204 /* Rates */
205 int devlink_rate_nodes_check(struct devlink *devlink, u16 mode,
206 struct netlink_ext_ack *extack);
207
208 /* Linecards */
209 struct devlink_linecard {
210 struct list_head list;
211 struct devlink *devlink;
212 unsigned int index;
213 const struct devlink_linecard_ops *ops;
214 void *priv;
215 enum devlink_linecard_state state;
216 struct mutex state_lock; /* Protects state */
217 const char *type;
218 struct devlink_linecard_type *types;
219 unsigned int types_count;
220 struct devlink *nested_devlink;
221 };
222
223 /* Devlink nl cmds */
224 int devlink_nl_cmd_reload(struct sk_buff *skb, struct genl_info *info);
225 int devlink_nl_cmd_eswitch_get_doit(struct sk_buff *skb, struct genl_info *info);
226 int devlink_nl_cmd_eswitch_set_doit(struct sk_buff *skb, struct genl_info *info);
227 int devlink_nl_cmd_flash_update(struct sk_buff *skb, struct genl_info *info);
228 int devlink_nl_cmd_selftests_run(struct sk_buff *skb, struct genl_info *info);
229 int devlink_nl_cmd_port_set_doit(struct sk_buff *skb, struct genl_info *info);
230 int devlink_nl_cmd_port_split_doit(struct sk_buff *skb, struct genl_info *info);
231 int devlink_nl_cmd_port_unsplit_doit(struct sk_buff *skb,
232 struct genl_info *info);
233 int devlink_nl_cmd_port_new_doit(struct sk_buff *skb, struct genl_info *info);
234 int devlink_nl_cmd_port_del_doit(struct sk_buff *skb, struct genl_info *info);
235 int devlink_nl_cmd_sb_pool_set_doit(struct sk_buff *skb, struct genl_info *info);
236 int devlink_nl_cmd_sb_port_pool_set_doit(struct sk_buff *skb,
237 struct genl_info *info);
238 int devlink_nl_cmd_sb_tc_pool_bind_set_doit(struct sk_buff *skb,
239 struct genl_info *info);
240 int devlink_nl_cmd_sb_occ_snapshot_doit(struct sk_buff *skb,
241 struct genl_info *info);
242 int devlink_nl_cmd_sb_occ_max_clear_doit(struct sk_buff *skb,
243 struct genl_info *info);
244 int devlink_nl_cmd_dpipe_table_get(struct sk_buff *skb, struct genl_info *info);
245 int devlink_nl_cmd_dpipe_entries_get(struct sk_buff *skb,
246 struct genl_info *info);
247 int devlink_nl_cmd_dpipe_headers_get(struct sk_buff *skb,
248 struct genl_info *info);
249 int devlink_nl_cmd_dpipe_table_counters_set(struct sk_buff *skb,
250 struct genl_info *info);
251 int devlink_nl_cmd_resource_set(struct sk_buff *skb, struct genl_info *info);
252 int devlink_nl_cmd_resource_dump(struct sk_buff *skb, struct genl_info *info);
253 int devlink_nl_cmd_param_set_doit(struct sk_buff *skb, struct genl_info *info);
254 int devlink_nl_cmd_port_param_get_dumpit(struct sk_buff *msg,
255 struct netlink_callback *cb);
256 int devlink_nl_cmd_port_param_get_doit(struct sk_buff *skb,
257 struct genl_info *info);
258 int devlink_nl_cmd_port_param_set_doit(struct sk_buff *skb,
259 struct genl_info *info);
260 int devlink_nl_cmd_region_new(struct sk_buff *skb, struct genl_info *info);
261 int devlink_nl_cmd_region_del(struct sk_buff *skb, struct genl_info *info);
262 int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
263 struct netlink_callback *cb);
264 int devlink_nl_cmd_health_reporter_set_doit(struct sk_buff *skb,
265 struct genl_info *info);
266 int devlink_nl_cmd_health_reporter_recover_doit(struct sk_buff *skb,
267 struct genl_info *info);
268 int devlink_nl_cmd_health_reporter_diagnose_doit(struct sk_buff *skb,
269 struct genl_info *info);
270 int devlink_nl_cmd_health_reporter_dump_get_dumpit(struct sk_buff *skb,
271 struct netlink_callback *cb);
272 int devlink_nl_cmd_health_reporter_dump_clear_doit(struct sk_buff *skb,
273 struct genl_info *info);
274 int devlink_nl_cmd_health_reporter_test_doit(struct sk_buff *skb,
275 struct genl_info *info);
276 int devlink_nl_cmd_trap_set_doit(struct sk_buff *skb, struct genl_info *info);
277 int devlink_nl_cmd_trap_group_set_doit(struct sk_buff *skb,
278 struct genl_info *info);
279 int devlink_nl_cmd_trap_policer_set_doit(struct sk_buff *skb,
280 struct genl_info *info);
281 int devlink_nl_cmd_rate_set_doit(struct sk_buff *skb, struct genl_info *info);
282 int devlink_nl_cmd_rate_new_doit(struct sk_buff *skb, struct genl_info *info);
283 int devlink_nl_cmd_rate_del_doit(struct sk_buff *skb, struct genl_info *info);
284 int devlink_nl_cmd_linecard_set_doit(struct sk_buff *skb,
285 struct genl_info *info);
286