1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* Copyright (c) 2016 Mellanox Technologies. All rights reserved. 3 * Copyright (c) 2016 Jiri Pirko <[email protected]> 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 struct devlink_rel; 21 22 #define DEVLINK_REGISTERED XA_MARK_1 23 24 #define DEVLINK_RELOAD_STATS_ARRAY_SIZE \ 25 (__DEVLINK_RELOAD_LIMIT_MAX * __DEVLINK_RELOAD_ACTION_MAX) 26 27 struct devlink_dev_stats { 28 u32 reload_stats[DEVLINK_RELOAD_STATS_ARRAY_SIZE]; 29 u32 remote_reload_stats[DEVLINK_RELOAD_STATS_ARRAY_SIZE]; 30 }; 31 32 struct devlink { 33 u32 index; 34 struct xarray ports; 35 struct list_head rate_list; 36 struct list_head sb_list; 37 struct list_head dpipe_table_list; 38 struct list_head resource_list; 39 struct xarray params; 40 struct list_head region_list; 41 struct list_head reporter_list; 42 struct devlink_dpipe_headers *dpipe_headers; 43 struct list_head trap_list; 44 struct list_head trap_group_list; 45 struct list_head trap_policer_list; 46 struct list_head linecard_list; 47 const struct devlink_ops *ops; 48 struct xarray snapshot_ids; 49 struct devlink_dev_stats stats; 50 struct device *dev; 51 possible_net_t _net; 52 /* Serializes access to devlink instance specific objects such as 53 * port, sb, dpipe, resource, params, region, traps and more. 54 */ 55 struct mutex lock; 56 struct lock_class_key lock_key; 57 u8 reload_failed:1; 58 refcount_t refcount; 59 struct rcu_work rwork; 60 struct devlink_rel *rel; 61 struct xarray nested_rels; 62 char priv[] __aligned(NETDEV_ALIGN); 63 }; 64 65 extern struct xarray devlinks; 66 extern struct genl_family devlink_nl_family; 67 68 /* devlink instances are open to the access from the user space after 69 * devlink_register() call. Such logical barrier allows us to have certain 70 * expectations related to locking. 71 * 72 * Before *_register() - we are in initialization stage and no parallel 73 * access possible to the devlink instance. All drivers perform that phase 74 * by implicitly holding device_lock. 75 * 76 * After *_register() - users and driver can access devlink instance at 77 * the same time. 78 */ 79 #define ASSERT_DEVLINK_REGISTERED(d) \ 80 WARN_ON_ONCE(!xa_get_mark(&devlinks, (d)->index, DEVLINK_REGISTERED)) 81 #define ASSERT_DEVLINK_NOT_REGISTERED(d) \ 82 WARN_ON_ONCE(xa_get_mark(&devlinks, (d)->index, DEVLINK_REGISTERED)) 83 84 /* Iterate over devlink pointers which were possible to get reference to. 85 * devlink_put() needs to be called for each iterated devlink pointer 86 * in loop body in order to release the reference. 87 */ 88 #define devlinks_xa_for_each_registered_get(net, index, devlink) \ 89 for (index = 0; (devlink = devlinks_xa_find_get(net, &index)); index++) 90 91 struct devlink *devlinks_xa_find_get(struct net *net, unsigned long *indexp); 92 93 static inline bool devl_is_registered(struct devlink *devlink) 94 { 95 devl_assert_locked(devlink); 96 return xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED); 97 } 98 99 typedef void devlink_rel_notify_cb_t(struct devlink *devlink, u32 obj_index); 100 typedef void devlink_rel_cleanup_cb_t(struct devlink *devlink, u32 obj_index, 101 u32 rel_index); 102 103 void devlink_rel_nested_in_clear(u32 rel_index); 104 int devlink_rel_nested_in_add(u32 *rel_index, u32 devlink_index, 105 u32 obj_index, devlink_rel_notify_cb_t *notify_cb, 106 devlink_rel_cleanup_cb_t *cleanup_cb, 107 struct devlink *devlink); 108 void devlink_rel_nested_in_notify(struct devlink *devlink); 109 int devlink_rel_devlink_handle_put(struct sk_buff *msg, struct devlink *devlink, 110 u32 rel_index, int attrtype, 111 bool *msg_updated); 112 113 /* Netlink */ 114 enum devlink_multicast_groups { 115 DEVLINK_MCGRP_CONFIG, 116 }; 117 118 /* state held across netlink dumps */ 119 struct devlink_nl_dump_state { 120 unsigned long instance; 121 int idx; 122 union { 123 /* DEVLINK_CMD_REGION_READ */ 124 struct { 125 u64 start_offset; 126 }; 127 /* DEVLINK_CMD_HEALTH_REPORTER_DUMP_GET */ 128 struct { 129 u64 dump_ts; 130 }; 131 }; 132 }; 133 134 typedef int devlink_nl_dump_one_func_t(struct sk_buff *msg, 135 struct devlink *devlink, 136 struct netlink_callback *cb, 137 int flags); 138 139 struct devlink * 140 devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs); 141 142 int devlink_nl_dumpit(struct sk_buff *msg, struct netlink_callback *cb, 143 devlink_nl_dump_one_func_t *dump_one); 144 145 static inline struct devlink_nl_dump_state * 146 devlink_dump_state(struct netlink_callback *cb) 147 { 148 NL_ASSERT_DUMP_CTX_FITS(struct devlink_nl_dump_state); 149 150 return (struct devlink_nl_dump_state *)cb->ctx; 151 } 152 153 static inline int 154 devlink_nl_put_handle(struct sk_buff *msg, struct devlink *devlink) 155 { 156 if (nla_put_string(msg, DEVLINK_ATTR_BUS_NAME, devlink->dev->bus->name)) 157 return -EMSGSIZE; 158 if (nla_put_string(msg, DEVLINK_ATTR_DEV_NAME, dev_name(devlink->dev))) 159 return -EMSGSIZE; 160 return 0; 161 } 162 163 int devlink_nl_put_nested_handle(struct sk_buff *msg, struct net *net, 164 struct devlink *devlink, int attrtype); 165 int devlink_nl_msg_reply_and_new(struct sk_buff **msg, struct genl_info *info); 166 167 /* Notify */ 168 void devlink_notify_register(struct devlink *devlink); 169 void devlink_notify_unregister(struct devlink *devlink); 170 void devlink_ports_notify_register(struct devlink *devlink); 171 void devlink_ports_notify_unregister(struct devlink *devlink); 172 void devlink_params_notify_register(struct devlink *devlink); 173 void devlink_params_notify_unregister(struct devlink *devlink); 174 void devlink_regions_notify_register(struct devlink *devlink); 175 void devlink_regions_notify_unregister(struct devlink *devlink); 176 void devlink_trap_policers_notify_register(struct devlink *devlink); 177 void devlink_trap_policers_notify_unregister(struct devlink *devlink); 178 void devlink_trap_groups_notify_register(struct devlink *devlink); 179 void devlink_trap_groups_notify_unregister(struct devlink *devlink); 180 void devlink_traps_notify_register(struct devlink *devlink); 181 void devlink_traps_notify_unregister(struct devlink *devlink); 182 void devlink_rates_notify_register(struct devlink *devlink); 183 void devlink_rates_notify_unregister(struct devlink *devlink); 184 void devlink_linecards_notify_register(struct devlink *devlink); 185 void devlink_linecards_notify_unregister(struct devlink *devlink); 186 187 /* Ports */ 188 #define ASSERT_DEVLINK_PORT_INITIALIZED(devlink_port) \ 189 WARN_ON_ONCE(!(devlink_port)->initialized) 190 191 struct devlink_port *devlink_port_get_by_index(struct devlink *devlink, 192 unsigned int port_index); 193 int devlink_port_netdevice_event(struct notifier_block *nb, 194 unsigned long event, void *ptr); 195 struct devlink_port * 196 devlink_port_get_from_info(struct devlink *devlink, struct genl_info *info); 197 struct devlink_port *devlink_port_get_from_attrs(struct devlink *devlink, 198 struct nlattr **attrs); 199 200 /* Reload */ 201 bool devlink_reload_actions_valid(const struct devlink_ops *ops); 202 int devlink_reload(struct devlink *devlink, struct net *dest_net, 203 enum devlink_reload_action action, 204 enum devlink_reload_limit limit, 205 u32 *actions_performed, struct netlink_ext_ack *extack); 206 207 static inline bool devlink_reload_supported(const struct devlink_ops *ops) 208 { 209 return ops->reload_down && ops->reload_up; 210 } 211 212 /* Params */ 213 void devlink_params_driverinit_load_new(struct devlink *devlink); 214 215 /* Resources */ 216 struct devlink_resource; 217 int devlink_resources_validate(struct devlink *devlink, 218 struct devlink_resource *resource, 219 struct genl_info *info); 220 221 /* Rates */ 222 int devlink_rate_nodes_check(struct devlink *devlink, u16 mode, 223 struct netlink_ext_ack *extack); 224 225 /* Linecards */ 226 unsigned int devlink_linecard_index(struct devlink_linecard *linecard); 227