net/devlink/devl_internal.h

   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 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 #define DEVLINK_NL_FLAG_NEED_PORT               BIT(0)
 115 #define DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT    BIT(1)
 116
 117 enum devlink_multicast_groups {
 118         DEVLINK_MCGRP_CONFIG,
 119 };
 120
 121 /* state held across netlink dumps */
 122 struct devlink_nl_dump_state {
 123         unsigned long instance;
 124         int idx;
 125         union {
 126                 /* DEVLINK_CMD_REGION_READ */
 127                 struct {
 128                         u64 start_offset;
 129                 };
 130                 /* DEVLINK_CMD_HEALTH_REPORTER_DUMP_GET */
 131                 struct {
 132                         u64 dump_ts;
 133                 };
 134         };
 135 };
 136
 137 typedef int devlink_nl_dump_one_func_t(struct sk_buff *msg,
 138                                        struct devlink *devlink,
 139                                        struct netlink_callback *cb,
 140                                        int flags);
 141
 142 struct devlink *
 143 devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs);
 144
 145 int devlink_nl_dumpit(struct sk_buff *msg, struct netlink_callback *cb,
 146                       devlink_nl_dump_one_func_t *dump_one);
 147
 148 static inline struct devlink_nl_dump_state *
 149 devlink_dump_state(struct netlink_callback *cb)
 150 {
 151         NL_ASSERT_DUMP_CTX_FITS(struct devlink_nl_dump_state);
 152
 153         return (struct devlink_nl_dump_state *)cb->ctx;
 154 }
 155
 156 static inline int
 157 devlink_nl_put_handle(struct sk_buff *msg, struct devlink *devlink)
 158 {
 159         if (nla_put_string(msg, DEVLINK_ATTR_BUS_NAME, devlink->dev->bus->name))
 160                 return -EMSGSIZE;
 161         if (nla_put_string(msg, DEVLINK_ATTR_DEV_NAME, dev_name(devlink->dev)))
 162                 return -EMSGSIZE;
 163         return 0;
 164 }
 165
 166 int devlink_nl_put_nested_handle(struct sk_buff *msg, struct net *net,
 167                                  struct devlink *devlink, int attrtype);
 168 int devlink_nl_msg_reply_and_new(struct sk_buff **msg, struct genl_info *info);
 169
 170 /* Notify */
 171 void devlink_notify_register(struct devlink *devlink);
 172 void devlink_notify_unregister(struct devlink *devlink);
 173 void devlink_ports_notify_register(struct devlink *devlink);
 174 void devlink_ports_notify_unregister(struct devlink *devlink);
 175 void devlink_params_notify_register(struct devlink *devlink);
 176 void devlink_params_notify_unregister(struct devlink *devlink);
 177 void devlink_regions_notify_register(struct devlink *devlink);
 178 void devlink_regions_notify_unregister(struct devlink *devlink);
 179 void devlink_trap_policers_notify_register(struct devlink *devlink);
 180 void devlink_trap_policers_notify_unregister(struct devlink *devlink);
 181 void devlink_trap_groups_notify_register(struct devlink *devlink);
 182 void devlink_trap_groups_notify_unregister(struct devlink *devlink);
 183 void devlink_traps_notify_register(struct devlink *devlink);
 184 void devlink_traps_notify_unregister(struct devlink *devlink);
 185 void devlink_rates_notify_register(struct devlink *devlink);
 186 void devlink_rates_notify_unregister(struct devlink *devlink);
 187 void devlink_linecards_notify_register(struct devlink *devlink);
 188 void devlink_linecards_notify_unregister(struct devlink *devlink);
 189
 190 /* Ports */
 191 #define ASSERT_DEVLINK_PORT_INITIALIZED(devlink_port)                           \
 192         WARN_ON_ONCE(!(devlink_port)->initialized)
 193
 194 struct devlink_port *devlink_port_get_by_index(struct devlink *devlink,
 195                                                unsigned int port_index);
 196 int devlink_port_netdevice_event(struct notifier_block *nb,
 197                                  unsigned long event, void *ptr);
 198 struct devlink_port *
 199 devlink_port_get_from_info(struct devlink *devlink, struct genl_info *info);
 200 struct devlink_port *devlink_port_get_from_attrs(struct devlink *devlink,
 201                                                  struct nlattr **attrs);
 202
 203 /* Reload */
 204 bool devlink_reload_actions_valid(const struct devlink_ops *ops);
 205 int devlink_reload(struct devlink *devlink, struct net *dest_net,
 206                    enum devlink_reload_action action,
 207                    enum devlink_reload_limit limit,
 208                    u32 *actions_performed, struct netlink_ext_ack *extack);
 209
 210 static inline bool devlink_reload_supported(const struct devlink_ops *ops)
 211 {
 212         return ops->reload_down && ops->reload_up;
 213 }
 214
 215 /* Params */
 216 void devlink_params_driverinit_load_new(struct devlink *devlink);
 217
 218 /* Resources */
 219 struct devlink_resource;
 220 int devlink_resources_validate(struct devlink *devlink,
 221                                struct devlink_resource *resource,
 222                                struct genl_info *info);
 223
 224 /* Rates */
 225 int devlink_rate_nodes_check(struct devlink *devlink, u16 mode,
 226                              struct netlink_ext_ack *extack);
 227
 228 /* Linecards */
 229 unsigned int devlink_linecard_index(struct devlink_linecard *linecard);