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 struct notifier_block netdevice_nb; 54 char priv[] __aligned(NETDEV_ALIGN); 55 }; 56 57 extern struct xarray devlinks; 58 extern struct genl_family devlink_nl_family; 59 60 /* devlink instances are open to the access from the user space after 61 * devlink_register() call. Such logical barrier allows us to have certain 62 * expectations related to locking. 63 * 64 * Before *_register() - we are in initialization stage and no parallel 65 * access possible to the devlink instance. All drivers perform that phase 66 * by implicitly holding device_lock. 67 * 68 * After *_register() - users and driver can access devlink instance at 69 * the same time. 70 */ 71 #define ASSERT_DEVLINK_REGISTERED(d) \ 72 WARN_ON_ONCE(!xa_get_mark(&devlinks, (d)->index, DEVLINK_REGISTERED)) 73 #define ASSERT_DEVLINK_NOT_REGISTERED(d) \ 74 WARN_ON_ONCE(xa_get_mark(&devlinks, (d)->index, DEVLINK_REGISTERED)) 75 76 /* Iterate over devlink pointers which were possible to get reference to. 77 * devlink_put() needs to be called for each iterated devlink pointer 78 * in loop body in order to release the reference. 79 */ 80 #define devlinks_xa_for_each_registered_get(net, index, devlink) \ 81 for (index = 0; (devlink = devlinks_xa_find_get(net, &index)); index++) 82 83 struct devlink *devlinks_xa_find_get(struct net *net, unsigned long *indexp); 84 85 static inline bool devl_is_registered(struct devlink *devlink) 86 { 87 devl_assert_locked(devlink); 88 return xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED); 89 } 90 91 /* Netlink */ 92 #define DEVLINK_NL_FLAG_NEED_PORT BIT(0) 93 #define DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT BIT(1) 94 #define DEVLINK_NL_FLAG_NEED_RATE BIT(2) 95 #define DEVLINK_NL_FLAG_NEED_RATE_NODE BIT(3) 96 #define DEVLINK_NL_FLAG_NEED_LINECARD BIT(4) 97 98 enum devlink_multicast_groups { 99 DEVLINK_MCGRP_CONFIG, 100 }; 101 102 /* state held across netlink dumps */ 103 struct devlink_nl_dump_state { 104 unsigned long instance; 105 int idx; 106 union { 107 /* DEVLINK_CMD_REGION_READ */ 108 struct { 109 u64 start_offset; 110 }; 111 /* DEVLINK_CMD_HEALTH_REPORTER_DUMP_GET */ 112 struct { 113 u64 dump_ts; 114 }; 115 }; 116 }; 117 118 struct devlink_cmd { 119 int (*dump_one)(struct sk_buff *msg, struct devlink *devlink, 120 struct netlink_callback *cb); 121 }; 122 123 extern const struct genl_small_ops devlink_nl_ops[56]; 124 125 struct devlink * 126 devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs); 127 128 void devlink_notify_unregister(struct devlink *devlink); 129 void devlink_notify_register(struct devlink *devlink); 130 131 int devlink_nl_instance_iter_dumpit(struct sk_buff *msg, 132 struct netlink_callback *cb); 133 134 static inline struct devlink_nl_dump_state * 135 devlink_dump_state(struct netlink_callback *cb) 136 { 137 NL_ASSERT_DUMP_CTX_FITS(struct devlink_nl_dump_state); 138 139 return (struct devlink_nl_dump_state *)cb->ctx; 140 } 141 142 static inline int 143 devlink_nl_put_handle(struct sk_buff *msg, struct devlink *devlink) 144 { 145 if (nla_put_string(msg, DEVLINK_ATTR_BUS_NAME, devlink->dev->bus->name)) 146 return -EMSGSIZE; 147 if (nla_put_string(msg, DEVLINK_ATTR_DEV_NAME, dev_name(devlink->dev))) 148 return -EMSGSIZE; 149 return 0; 150 } 151 152 /* Commands */ 153 extern const struct devlink_cmd devl_cmd_get; 154 extern const struct devlink_cmd devl_cmd_port_get; 155 extern const struct devlink_cmd devl_cmd_sb_get; 156 extern const struct devlink_cmd devl_cmd_sb_pool_get; 157 extern const struct devlink_cmd devl_cmd_sb_port_pool_get; 158 extern const struct devlink_cmd devl_cmd_sb_tc_pool_bind_get; 159 extern const struct devlink_cmd devl_cmd_param_get; 160 extern const struct devlink_cmd devl_cmd_region_get; 161 extern const struct devlink_cmd devl_cmd_info_get; 162 extern const struct devlink_cmd devl_cmd_health_reporter_get; 163 extern const struct devlink_cmd devl_cmd_trap_get; 164 extern const struct devlink_cmd devl_cmd_trap_group_get; 165 extern const struct devlink_cmd devl_cmd_trap_policer_get; 166 extern const struct devlink_cmd devl_cmd_rate_get; 167 extern const struct devlink_cmd devl_cmd_linecard_get; 168 extern const struct devlink_cmd devl_cmd_selftests_get; 169 170 /* Notify */ 171 void devlink_notify(struct devlink *devlink, enum devlink_command cmd); 172 173 /* Ports */ 174 int devlink_port_netdevice_event(struct notifier_block *nb, 175 unsigned long event, void *ptr); 176 177 struct devlink_port * 178 devlink_port_get_from_info(struct devlink *devlink, struct genl_info *info); 179 struct devlink_port *devlink_port_get_from_attrs(struct devlink *devlink, 180 struct nlattr **attrs); 181 182 /* Reload */ 183 bool devlink_reload_actions_valid(const struct devlink_ops *ops); 184 int devlink_reload(struct devlink *devlink, struct net *dest_net, 185 enum devlink_reload_action action, 186 enum devlink_reload_limit limit, 187 u32 *actions_performed, struct netlink_ext_ack *extack); 188 189 static inline bool devlink_reload_supported(const struct devlink_ops *ops) 190 { 191 return ops->reload_down && ops->reload_up; 192 } 193 194 /* Params */ 195 void devlink_params_driverinit_load_new(struct devlink *devlink); 196 197 /* Resources */ 198 struct devlink_resource; 199 int devlink_resources_validate(struct devlink *devlink, 200 struct devlink_resource *resource, 201 struct genl_info *info); 202 203 /* Line cards */ 204 struct devlink_linecard; 205 206 struct devlink_linecard * 207 devlink_linecard_get_from_info(struct devlink *devlink, struct genl_info *info); 208 209 /* Rates */ 210 int devlink_rate_nodes_check(struct devlink *devlink, u16 mode, 211 struct netlink_ext_ack *extack); 212 struct devlink_rate * 213 devlink_rate_get_from_info(struct devlink *devlink, struct genl_info *info); 214 struct devlink_rate * 215 devlink_rate_node_get_from_info(struct devlink *devlink, 216 struct genl_info *info); 217 /* Devlink nl cmds */ 218 int devlink_nl_cmd_get_doit(struct sk_buff *skb, struct genl_info *info); 219 int devlink_nl_cmd_reload(struct sk_buff *skb, struct genl_info *info); 220 int devlink_nl_cmd_eswitch_get_doit(struct sk_buff *skb, struct genl_info *info); 221 int devlink_nl_cmd_eswitch_set_doit(struct sk_buff *skb, struct genl_info *info); 222 int devlink_nl_cmd_info_get_doit(struct sk_buff *skb, struct genl_info *info); 223 int devlink_nl_cmd_flash_update(struct sk_buff *skb, struct genl_info *info); 224 int devlink_nl_cmd_selftests_get_doit(struct sk_buff *skb, struct genl_info *info); 225 int devlink_nl_cmd_selftests_run(struct sk_buff *skb, struct genl_info *info); 226 int devlink_nl_cmd_health_reporter_get_doit(struct sk_buff *skb, 227 struct genl_info *info); 228 int devlink_nl_cmd_health_reporter_set_doit(struct sk_buff *skb, 229 struct genl_info *info); 230 int devlink_nl_cmd_health_reporter_recover_doit(struct sk_buff *skb, 231 struct genl_info *info); 232 int devlink_nl_cmd_health_reporter_diagnose_doit(struct sk_buff *skb, 233 struct genl_info *info); 234 int devlink_nl_cmd_health_reporter_dump_get_dumpit(struct sk_buff *skb, 235 struct netlink_callback *cb); 236 int devlink_nl_cmd_health_reporter_dump_clear_doit(struct sk_buff *skb, 237 struct genl_info *info); 238 int devlink_nl_cmd_health_reporter_test_doit(struct sk_buff *skb, 239 struct genl_info *info); 240