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 #include "netlink_gen.h" 16 17 #define DEVLINK_REGISTERED XA_MARK_1 18 19 #define DEVLINK_RELOAD_STATS_ARRAY_SIZE \ 20 (__DEVLINK_RELOAD_LIMIT_MAX * __DEVLINK_RELOAD_ACTION_MAX) 21 22 struct devlink_dev_stats { 23 u32 reload_stats[DEVLINK_RELOAD_STATS_ARRAY_SIZE]; 24 u32 remote_reload_stats[DEVLINK_RELOAD_STATS_ARRAY_SIZE]; 25 }; 26 27 struct devlink { 28 u32 index; 29 struct xarray ports; 30 struct list_head rate_list; 31 struct list_head sb_list; 32 struct list_head dpipe_table_list; 33 struct list_head resource_list; 34 struct xarray params; 35 struct list_head region_list; 36 struct list_head reporter_list; 37 struct devlink_dpipe_headers *dpipe_headers; 38 struct list_head trap_list; 39 struct list_head trap_group_list; 40 struct list_head trap_policer_list; 41 struct list_head linecard_list; 42 const struct devlink_ops *ops; 43 struct xarray snapshot_ids; 44 struct devlink_dev_stats stats; 45 struct device *dev; 46 possible_net_t _net; 47 /* Serializes access to devlink instance specific objects such as 48 * port, sb, dpipe, resource, params, region, traps and more. 49 */ 50 struct mutex lock; 51 struct lock_class_key lock_key; 52 u8 reload_failed:1; 53 refcount_t refcount; 54 struct rcu_work rwork; 55 char priv[] __aligned(NETDEV_ALIGN); 56 }; 57 58 extern struct xarray devlinks; 59 extern struct genl_family devlink_nl_family; 60 61 /* devlink instances are open to the access from the user space after 62 * devlink_register() call. Such logical barrier allows us to have certain 63 * expectations related to locking. 64 * 65 * Before *_register() - we are in initialization stage and no parallel 66 * access possible to the devlink instance. All drivers perform that phase 67 * by implicitly holding device_lock. 68 * 69 * After *_register() - users and driver can access devlink instance at 70 * the same time. 71 */ 72 #define ASSERT_DEVLINK_REGISTERED(d) \ 73 WARN_ON_ONCE(!xa_get_mark(&devlinks, (d)->index, DEVLINK_REGISTERED)) 74 #define ASSERT_DEVLINK_NOT_REGISTERED(d) \ 75 WARN_ON_ONCE(xa_get_mark(&devlinks, (d)->index, DEVLINK_REGISTERED)) 76 77 /* Iterate over devlink pointers which were possible to get reference to. 78 * devlink_put() needs to be called for each iterated devlink pointer 79 * in loop body in order to release the reference. 80 */ 81 #define devlinks_xa_for_each_registered_get(net, index, devlink) \ 82 for (index = 0; (devlink = devlinks_xa_find_get(net, &index)); index++) 83 84 struct devlink *devlinks_xa_find_get(struct net *net, unsigned long *indexp); 85 86 static inline bool devl_is_registered(struct devlink *devlink) 87 { 88 devl_assert_locked(devlink); 89 return xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED); 90 } 91 92 /* Netlink */ 93 #define DEVLINK_NL_FLAG_NEED_PORT BIT(0) 94 #define DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT BIT(1) 95 #define DEVLINK_NL_FLAG_NEED_RATE BIT(2) 96 #define DEVLINK_NL_FLAG_NEED_RATE_NODE BIT(3) 97 #define DEVLINK_NL_FLAG_NEED_LINECARD BIT(4) 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); 122 123 struct devlink_cmd { 124 devlink_nl_dump_one_func_t *dump_one; 125 }; 126 127 extern const struct genl_small_ops devlink_nl_small_ops[54]; 128 129 struct devlink * 130 devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs); 131 132 void devlink_notify_unregister(struct devlink *devlink); 133 void devlink_notify_register(struct devlink *devlink); 134 135 int devlink_nl_dumpit(struct sk_buff *msg, struct netlink_callback *cb, 136 devlink_nl_dump_one_func_t *dump_one); 137 int devlink_nl_instance_iter_dumpit(struct sk_buff *msg, struct netlink_callback *cb); 138 139 static inline struct devlink_nl_dump_state * 140 devlink_dump_state(struct netlink_callback *cb) 141 { 142 NL_ASSERT_DUMP_CTX_FITS(struct devlink_nl_dump_state); 143 144 return (struct devlink_nl_dump_state *)cb->ctx; 145 } 146 147 static inline int 148 devlink_nl_put_handle(struct sk_buff *msg, struct devlink *devlink) 149 { 150 if (nla_put_string(msg, DEVLINK_ATTR_BUS_NAME, devlink->dev->bus->name)) 151 return -EMSGSIZE; 152 if (nla_put_string(msg, DEVLINK_ATTR_DEV_NAME, dev_name(devlink->dev))) 153 return -EMSGSIZE; 154 return 0; 155 } 156 157 /* Commands */ 158 extern const struct devlink_cmd devl_cmd_port_get; 159 extern const struct devlink_cmd devl_cmd_sb_get; 160 extern const struct devlink_cmd devl_cmd_sb_pool_get; 161 extern const struct devlink_cmd devl_cmd_sb_port_pool_get; 162 extern const struct devlink_cmd devl_cmd_sb_tc_pool_bind_get; 163 extern const struct devlink_cmd devl_cmd_param_get; 164 extern const struct devlink_cmd devl_cmd_region_get; 165 extern const struct devlink_cmd devl_cmd_health_reporter_get; 166 extern const struct devlink_cmd devl_cmd_trap_get; 167 extern const struct devlink_cmd devl_cmd_trap_group_get; 168 extern const struct devlink_cmd devl_cmd_trap_policer_get; 169 extern const struct devlink_cmd devl_cmd_rate_get; 170 extern const struct devlink_cmd devl_cmd_linecard_get; 171 extern const struct devlink_cmd devl_cmd_selftests_get; 172 173 /* Notify */ 174 void devlink_notify(struct devlink *devlink, enum devlink_command cmd); 175 176 /* Ports */ 177 int devlink_port_netdevice_event(struct notifier_block *nb, 178 unsigned long event, void *ptr); 179 180 struct devlink_port * 181 devlink_port_get_from_info(struct devlink *devlink, struct genl_info *info); 182 struct devlink_port *devlink_port_get_from_attrs(struct devlink *devlink, 183 struct nlattr **attrs); 184 185 /* Reload */ 186 bool devlink_reload_actions_valid(const struct devlink_ops *ops); 187 int devlink_reload(struct devlink *devlink, struct net *dest_net, 188 enum devlink_reload_action action, 189 enum devlink_reload_limit limit, 190 u32 *actions_performed, struct netlink_ext_ack *extack); 191 192 static inline bool devlink_reload_supported(const struct devlink_ops *ops) 193 { 194 return ops->reload_down && ops->reload_up; 195 } 196 197 /* Params */ 198 void devlink_params_driverinit_load_new(struct devlink *devlink); 199 200 /* Resources */ 201 struct devlink_resource; 202 int devlink_resources_validate(struct devlink *devlink, 203 struct devlink_resource *resource, 204 struct genl_info *info); 205 206 /* Line cards */ 207 struct devlink_linecard; 208 209 struct devlink_linecard * 210 devlink_linecard_get_from_info(struct devlink *devlink, struct genl_info *info); 211 212 /* Rates */ 213 int devlink_rate_nodes_check(struct devlink *devlink, u16 mode, 214 struct netlink_ext_ack *extack); 215 struct devlink_rate * 216 devlink_rate_get_from_info(struct devlink *devlink, struct genl_info *info); 217 struct devlink_rate * 218 devlink_rate_node_get_from_info(struct devlink *devlink, 219 struct genl_info *info); 220 /* Devlink nl cmds */ 221 int devlink_nl_cmd_reload(struct sk_buff *skb, struct genl_info *info); 222 int devlink_nl_cmd_eswitch_get_doit(struct sk_buff *skb, struct genl_info *info); 223 int devlink_nl_cmd_eswitch_set_doit(struct sk_buff *skb, struct genl_info *info); 224 int devlink_nl_cmd_flash_update(struct sk_buff *skb, struct genl_info *info); 225 int devlink_nl_cmd_selftests_get_doit(struct sk_buff *skb, struct genl_info *info); 226 int devlink_nl_cmd_selftests_run(struct sk_buff *skb, struct genl_info *info); 227 int devlink_nl_cmd_health_reporter_get_doit(struct sk_buff *skb, 228 struct genl_info *info); 229 int devlink_nl_cmd_health_reporter_set_doit(struct sk_buff *skb, 230 struct genl_info *info); 231 int devlink_nl_cmd_health_reporter_recover_doit(struct sk_buff *skb, 232 struct genl_info *info); 233 int devlink_nl_cmd_health_reporter_diagnose_doit(struct sk_buff *skb, 234 struct genl_info *info); 235 int devlink_nl_cmd_health_reporter_dump_get_dumpit(struct sk_buff *skb, 236 struct netlink_callback *cb); 237 int devlink_nl_cmd_health_reporter_dump_clear_doit(struct sk_buff *skb, 238 struct genl_info *info); 239 int devlink_nl_cmd_health_reporter_test_doit(struct sk_buff *skb, 240 struct genl_info *info); 241