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 list_head param_list; 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_gen_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_dump(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 /* gen cmds */ 143 extern const struct devlink_gen_cmd devl_gen_inst; 144 extern const struct devlink_gen_cmd devl_gen_port; 145 extern const struct devlink_gen_cmd devl_gen_sb; 146 extern const struct devlink_gen_cmd devl_gen_sb_pool; 147 extern const struct devlink_gen_cmd devl_gen_sb_port_pool; 148 extern const struct devlink_gen_cmd devl_gen_sb_tc_pool_bind; 149 extern const struct devlink_gen_cmd devl_gen_selftests; 150 extern const struct devlink_gen_cmd devl_gen_param; 151 extern const struct devlink_gen_cmd devl_gen_region; 152 extern const struct devlink_gen_cmd devl_gen_info; 153 extern const struct devlink_gen_cmd devl_gen_health_reporter; 154 extern const struct devlink_gen_cmd devl_gen_trap; 155 extern const struct devlink_gen_cmd devl_gen_trap_group; 156 extern const struct devlink_gen_cmd devl_gen_trap_policer; 157 extern const struct devlink_gen_cmd devl_gen_linecard; 158 159 /* Ports */ 160 int devlink_port_netdevice_event(struct notifier_block *nb, 161 unsigned long event, void *ptr); 162 163 struct devlink_port * 164 devlink_port_get_from_info(struct devlink *devlink, struct genl_info *info); 165 166 /* Reload */ 167 bool devlink_reload_actions_valid(const struct devlink_ops *ops); 168 int devlink_reload(struct devlink *devlink, struct net *dest_net, 169 enum devlink_reload_action action, 170 enum devlink_reload_limit limit, 171 u32 *actions_performed, struct netlink_ext_ack *extack); 172 173 static inline bool devlink_reload_supported(const struct devlink_ops *ops) 174 { 175 return ops->reload_down && ops->reload_up; 176 } 177 178 /* Line cards */ 179 struct devlink_linecard; 180 181 struct devlink_linecard * 182 devlink_linecard_get_from_info(struct devlink *devlink, struct genl_info *info); 183 184 /* Rates */ 185 extern const struct devlink_gen_cmd devl_gen_rate_get; 186 187 struct devlink_rate * 188 devlink_rate_get_from_info(struct devlink *devlink, struct genl_info *info); 189 struct devlink_rate * 190 devlink_rate_node_get_from_info(struct devlink *devlink, 191 struct genl_info *info); 192