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/device.h>
   7 #include <linux/etherdevice.h>
   8 #include <linux/mutex.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/notifier.h>
  11 #include <linux/types.h>
  12 #include <linux/workqueue.h>
  13 #include <linux/xarray.h>
  14 #include <net/devlink.h>
  15 #include <net/net_namespace.h>
  16 #include <net/rtnetlink.h>
  17 #include <rdma/ib_verbs.h>
  18
  19 #include "netlink_gen.h"
  20
  21 struct devlink_rel;
  22
  23 #define DEVLINK_REGISTERED XA_MARK_1
  24
  25 #define DEVLINK_RELOAD_STATS_ARRAY_SIZE \
  26         (__DEVLINK_RELOAD_LIMIT_MAX * __DEVLINK_RELOAD_ACTION_MAX)
  27
  28 struct devlink_dev_stats {
  29         u32 reload_stats[DEVLINK_RELOAD_STATS_ARRAY_SIZE];
  30         u32 remote_reload_stats[DEVLINK_RELOAD_STATS_ARRAY_SIZE];
  31 };
  32
  33 struct devlink {
  34         u32 index;
  35         struct xarray ports;
  36         struct list_head rate_list;
  37         struct list_head sb_list;
  38         struct list_head dpipe_table_list;
  39         struct list_head resource_list;
  40         struct xarray params;
  41         struct list_head region_list;
  42         struct list_head reporter_list;
  43         struct devlink_dpipe_headers *dpipe_headers;
  44         struct list_head trap_list;
  45         struct list_head trap_group_list;
  46         struct list_head trap_policer_list;
  47         struct list_head linecard_list;
  48         const struct devlink_ops *ops;
  49         struct xarray snapshot_ids;
  50         struct devlink_dev_stats stats;
  51         struct device *dev;
  52         possible_net_t _net;
  53         /* Serializes access to devlink instance specific objects such as
  54          * port, sb, dpipe, resource, params, region, traps and more.
  55          */
  56         struct mutex lock;
  57         struct lock_class_key lock_key;
  58         u8 reload_failed:1;
  59         refcount_t refcount;
  60         struct rcu_work rwork;
  61         struct devlink_rel *rel;
  62         struct xarray nested_rels;
  63         char priv[] __aligned(NETDEV_ALIGN);
  64 };
  65
  66 extern struct xarray devlinks;
  67 extern struct genl_family devlink_nl_family;
  68
  69 /* devlink instances are open to the access from the user space after
  70  * devlink_register() call. Such logical barrier allows us to have certain
  71  * expectations related to locking.
  72  *
  73  * Before *_register() - we are in initialization stage and no parallel
  74  * access possible to the devlink instance. All drivers perform that phase
  75  * by implicitly holding device_lock.
  76  *
  77  * After *_register() - users and driver can access devlink instance at
  78  * the same time.
  79  */
  80 #define ASSERT_DEVLINK_REGISTERED(d)                                           \
  81         WARN_ON_ONCE(!xa_get_mark(&devlinks, (d)->index, DEVLINK_REGISTERED))
  82 #define ASSERT_DEVLINK_NOT_REGISTERED(d)                                       \
  83         WARN_ON_ONCE(xa_get_mark(&devlinks, (d)->index, DEVLINK_REGISTERED))
  84
  85 /* Iterate over devlink pointers which were possible to get reference to.
  86  * devlink_put() needs to be called for each iterated devlink pointer
  87  * in loop body in order to release the reference.
  88  */
  89 #define devlinks_xa_for_each_registered_get(net, index, devlink)        \
  90         for (index = 0; (devlink = devlinks_xa_find_get(net, &index)); index++)
  91
  92 struct devlink *devlinks_xa_find_get(struct net *net, unsigned long *indexp);
  93
  94 static inline bool __devl_is_registered(struct devlink *devlink)
  95 {
  96         return xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED);
  97 }
  98
  99 static inline bool devl_is_registered(struct devlink *devlink)
 100 {
 101         devl_assert_locked(devlink);
 102         return __devl_is_registered(devlink);
 103 }
 104
 105 static inline void devl_dev_lock(struct devlink *devlink, bool dev_lock)
 106 {
 107         if (dev_lock)
 108                 device_lock(devlink->dev);
 109         devl_lock(devlink);
 110 }
 111
 112 static inline void devl_dev_unlock(struct devlink *devlink, bool dev_lock)
 113 {
 114         devl_unlock(devlink);
 115         if (dev_lock)
 116                 device_unlock(devlink->dev);
 117 }
 118
 119 typedef void devlink_rel_notify_cb_t(struct devlink *devlink, u32 obj_index);
 120 typedef void devlink_rel_cleanup_cb_t(struct devlink *devlink, u32 obj_index,
 121                                       u32 rel_index);
 122
 123 void devlink_rel_nested_in_clear(u32 rel_index);
 124 int devlink_rel_nested_in_add(u32 *rel_index, u32 devlink_index,
 125                               u32 obj_index, devlink_rel_notify_cb_t *notify_cb,
 126                               devlink_rel_cleanup_cb_t *cleanup_cb,
 127                               struct devlink *devlink);
 128 void devlink_rel_nested_in_notify(struct devlink *devlink);
 129 int devlink_rel_devlink_handle_put(struct sk_buff *msg, struct devlink *devlink,
 130                                    u32 rel_index, int attrtype,
 131                                    bool *msg_updated);
 132
 133 /* Netlink */
 134 enum devlink_multicast_groups {
 135         DEVLINK_MCGRP_CONFIG,
 136 };
 137
 138 /* state held across netlink dumps */
 139 struct devlink_nl_dump_state {
 140         unsigned long instance;
 141         int idx;
 142         union {
 143                 /* DEVLINK_CMD_REGION_READ */
 144                 struct {
 145                         u64 start_offset;
 146                 };
 147                 /* DEVLINK_CMD_HEALTH_REPORTER_DUMP_GET */
 148                 struct {
 149                         u64 dump_ts;
 150                 };
 151         };
 152 };
 153
 154 typedef int devlink_nl_dump_one_func_t(struct sk_buff *msg,
 155                                        struct devlink *devlink,
 156                                        struct netlink_callback *cb,
 157                                        int flags);
 158
 159 struct devlink *
 160 devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs,
 161                             bool dev_lock);
 162
 163 int devlink_nl_dumpit(struct sk_buff *msg, struct netlink_callback *cb,
 164                       devlink_nl_dump_one_func_t *dump_one);
 165
 166 static inline struct devlink_nl_dump_state *
 167 devlink_dump_state(struct netlink_callback *cb)
 168 {
 169         NL_ASSERT_CTX_FITS(struct devlink_nl_dump_state);
 170
 171         return (struct devlink_nl_dump_state *)cb->ctx;
 172 }
 173
 174 static inline int
 175 devlink_nl_put_handle(struct sk_buff *msg, struct devlink *devlink)
 176 {
 177         if (nla_put_string(msg, DEVLINK_ATTR_BUS_NAME, devlink->dev->bus->name))
 178                 return -EMSGSIZE;
 179         if (nla_put_string(msg, DEVLINK_ATTR_DEV_NAME, dev_name(devlink->dev)))
 180                 return -EMSGSIZE;
 181         return 0;
 182 }
 183
 184 static inline int devlink_nl_put_u64(struct sk_buff *msg, int attrtype, u64 val)
 185 {
 186         return nla_put_u64_64bit(msg, attrtype, val, DEVLINK_ATTR_PAD);
 187 }
 188
 189 int devlink_nl_put_nested_handle(struct sk_buff *msg, struct net *net,
 190                                  struct devlink *devlink, int attrtype);
 191 int devlink_nl_msg_reply_and_new(struct sk_buff **msg, struct genl_info *info);
 192
 193 static inline bool devlink_nl_notify_need(struct devlink *devlink)
 194 {
 195         return genl_has_listeners(&devlink_nl_family, devlink_net(devlink),
 196                                   DEVLINK_MCGRP_CONFIG);
 197 }
 198
 199 struct devlink_obj_desc {
 200         struct rcu_head rcu;
 201         const char *bus_name;
 202         const char *dev_name;
 203         unsigned int port_index;
 204         bool port_index_valid;
 205         long data[];
 206 };
 207
 208 static inline void devlink_nl_obj_desc_init(struct devlink_obj_desc *desc,
 209                                             struct devlink *devlink)
 210 {
 211         memset(desc, 0, sizeof(*desc));
 212         desc->bus_name = devlink->dev->bus->name;
 213         desc->dev_name = dev_name(devlink->dev);
 214 }
 215
 216 static inline void devlink_nl_obj_desc_port_set(struct devlink_obj_desc *desc,
 217                                                 struct devlink_port *devlink_port)
 218 {
 219         desc->port_index = devlink_port->index;
 220         desc->port_index_valid = true;
 221 }
 222
 223 int devlink_nl_notify_filter(struct sock *dsk, struct sk_buff *skb, void *data);
 224
 225 static inline void devlink_nl_notify_send_desc(struct devlink *devlink,
 226                                                struct sk_buff *msg,
 227                                                struct devlink_obj_desc *desc)
 228 {
 229         genlmsg_multicast_netns_filtered(&devlink_nl_family,
 230                                          devlink_net(devlink),
 231                                          msg, 0, DEVLINK_MCGRP_CONFIG,
 232                                          GFP_KERNEL,
 233                                          devlink_nl_notify_filter, desc);
 234 }
 235
 236 static inline void devlink_nl_notify_send(struct devlink *devlink,
 237                                           struct sk_buff *msg)
 238 {
 239         struct devlink_obj_desc desc;
 240
 241         devlink_nl_obj_desc_init(&desc, devlink);
 242         devlink_nl_notify_send_desc(devlink, msg, &desc);
 243 }
 244
 245 /* Notify */
 246 void devlink_notify_register(struct devlink *devlink);
 247 void devlink_notify_unregister(struct devlink *devlink);
 248 void devlink_ports_notify_register(struct devlink *devlink);
 249 void devlink_ports_notify_unregister(struct devlink *devlink);
 250 void devlink_params_notify_register(struct devlink *devlink);
 251 void devlink_params_notify_unregister(struct devlink *devlink);
 252 void devlink_regions_notify_register(struct devlink *devlink);
 253 void devlink_regions_notify_unregister(struct devlink *devlink);
 254 void devlink_trap_policers_notify_register(struct devlink *devlink);
 255 void devlink_trap_policers_notify_unregister(struct devlink *devlink);
 256 void devlink_trap_groups_notify_register(struct devlink *devlink);
 257 void devlink_trap_groups_notify_unregister(struct devlink *devlink);
 258 void devlink_traps_notify_register(struct devlink *devlink);
 259 void devlink_traps_notify_unregister(struct devlink *devlink);
 260 void devlink_rates_notify_register(struct devlink *devlink);
 261 void devlink_rates_notify_unregister(struct devlink *devlink);
 262 void devlink_linecards_notify_register(struct devlink *devlink);
 263 void devlink_linecards_notify_unregister(struct devlink *devlink);
 264
 265 /* Ports */
 266 #define ASSERT_DEVLINK_PORT_INITIALIZED(devlink_port)                           \
 267         WARN_ON_ONCE(!(devlink_port)->initialized)
 268
 269 struct devlink_port *devlink_port_get_by_index(struct devlink *devlink,
 270                                                unsigned int port_index);
 271 int devlink_port_netdevice_event(struct notifier_block *nb,
 272                                  unsigned long event, void *ptr);
 273 struct devlink_port *
 274 devlink_port_get_from_info(struct devlink *devlink, struct genl_info *info);
 275 struct devlink_port *devlink_port_get_from_attrs(struct devlink *devlink,
 276                                                  struct nlattr **attrs);
 277
 278 /* Reload */
 279 bool devlink_reload_actions_valid(const struct devlink_ops *ops);
 280 int devlink_reload(struct devlink *devlink, struct net *dest_net,
 281                    enum devlink_reload_action action,
 282                    enum devlink_reload_limit limit,
 283                    u32 *actions_performed, struct netlink_ext_ack *extack);
 284
 285 static inline bool devlink_reload_supported(const struct devlink_ops *ops)
 286 {
 287         return ops->reload_down && ops->reload_up;
 288 }
 289
 290 /* Params */
 291 void devlink_params_driverinit_load_new(struct devlink *devlink);
 292
 293 /* Resources */
 294 struct devlink_resource;
 295 int devlink_resources_validate(struct devlink *devlink,
 296                                struct devlink_resource *resource,
 297                                struct genl_info *info);
 298
 299 /* Rates */
 300 int devlink_rate_nodes_check(struct devlink *devlink, u16 mode,
 301                              struct netlink_ext_ack *extack);
 302
 303 /* Linecards */
 304 unsigned int devlink_linecard_index(struct devlink_linecard *linecard);