include/linux/if_team.h

   1 /*
   2  * include/linux/if_team.h - Network team device driver header
   3  * Copyright (c) 2011 Jiri Pirko <jpirko@redhat.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10 #ifndef _LINUX_IF_TEAM_H_
  11 #define _LINUX_IF_TEAM_H_
  12
  13 #include <linux/netpoll.h>
  14 #include <net/sch_generic.h>
  15 #include <linux/types.h>
  16 #include <uapi/linux/if_team.h>
  17
  18 struct team_pcpu_stats {
  19         u64                     rx_packets;
  20         u64                     rx_bytes;
  21         u64                     rx_multicast;
  22         u64                     tx_packets;
  23         u64                     tx_bytes;
  24         struct u64_stats_sync   syncp;
  25         u32                     rx_dropped;
  26         u32                     tx_dropped;
  27         u32                     rx_nohandler;
  28 };
  29
  30 struct team;
  31
  32 struct team_port {
  33         struct net_device *dev;
  34         struct hlist_node hlist; /* node in enabled ports hash list */
  35         struct list_head list; /* node in ordinary list */
  36         struct team *team;
  37         int index; /* index of enabled port. If disabled, it's set to -1 */
  38
  39         bool linkup; /* either state.linkup or user.linkup */
  40
  41         struct {
  42                 bool linkup;
  43                 u32 speed;
  44                 u8 duplex;
  45         } state;
  46
  47         /* Values set by userspace */
  48         struct {
  49                 bool linkup;
  50                 bool linkup_enabled;
  51         } user;
  52
  53         /* Custom gennetlink interface related flags */
  54         bool changed;
  55         bool removed;
  56
  57         /*
  58          * A place for storing original values of the device before it
  59          * become a port.
  60          */
  61         struct {
  62                 unsigned char dev_addr[MAX_ADDR_LEN];
  63                 unsigned int mtu;
  64         } orig;
  65
  66 #ifdef CONFIG_NET_POLL_CONTROLLER
  67         struct netpoll *np;
  68 #endif
  69
  70         s32 priority; /* lower number ~ higher priority */
  71         u16 queue_id;
  72         struct list_head qom_list; /* node in queue override mapping list */
  73         struct rcu_head rcu;
  74         long mode_priv[0];
  75 };
  76
  77 static inline struct team_port *team_port_get_rcu(const struct net_device *dev)
  78 {
  79         return rcu_dereference(dev->rx_handler_data);
  80 }
  81
  82 static inline bool team_port_enabled(struct team_port *port)
  83 {
  84         return port->index != -1;
  85 }
  86
  87 static inline bool team_port_txable(struct team_port *port)
  88 {
  89         return port->linkup && team_port_enabled(port);
  90 }
  91
  92 static inline bool team_port_dev_txable(const struct net_device *port_dev)
  93 {
  94         struct team_port *port;
  95         bool txable;
  96
  97         rcu_read_lock();
  98         port = team_port_get_rcu(port_dev);
  99         txable = port ? team_port_txable(port) : false;
 100         rcu_read_unlock();
 101
 102         return txable;
 103 }
 104
 105 #ifdef CONFIG_NET_POLL_CONTROLLER
 106 static inline void team_netpoll_send_skb(struct team_port *port,
 107                                          struct sk_buff *skb)
 108 {
 109         struct netpoll *np = port->np;
 110
 111         if (np)
 112                 netpoll_send_skb(np, skb);
 113 }
 114 #else
 115 static inline void team_netpoll_send_skb(struct team_port *port,
 116                                          struct sk_buff *skb)
 117 {
 118 }
 119 #endif
 120
 121 struct team_mode_ops {
 122         int (*init)(struct team *team);
 123         void (*exit)(struct team *team);
 124         rx_handler_result_t (*receive)(struct team *team,
 125                                        struct team_port *port,
 126                                        struct sk_buff *skb);
 127         bool (*transmit)(struct team *team, struct sk_buff *skb);
 128         int (*port_enter)(struct team *team, struct team_port *port);
 129         void (*port_leave)(struct team *team, struct team_port *port);
 130         void (*port_change_dev_addr)(struct team *team, struct team_port *port);
 131         void (*port_enabled)(struct team *team, struct team_port *port);
 132         void (*port_disabled)(struct team *team, struct team_port *port);
 133 };
 134
 135 extern int team_modeop_port_enter(struct team *team, struct team_port *port);
 136 extern void team_modeop_port_change_dev_addr(struct team *team,
 137                                              struct team_port *port);
 138
 139 enum team_option_type {
 140         TEAM_OPTION_TYPE_U32,
 141         TEAM_OPTION_TYPE_STRING,
 142         TEAM_OPTION_TYPE_BINARY,
 143         TEAM_OPTION_TYPE_BOOL,
 144         TEAM_OPTION_TYPE_S32,
 145 };
 146
 147 struct team_option_inst_info {
 148         u32 array_index;
 149         struct team_port *port; /* != NULL if per-port */
 150 };
 151
 152 struct team_gsetter_ctx {
 153         union {
 154                 u32 u32_val;
 155                 const char *str_val;
 156                 struct {
 157                         const void *ptr;
 158                         u32 len;
 159                 } bin_val;
 160                 bool bool_val;
 161                 s32 s32_val;
 162         } data;
 163         struct team_option_inst_info *info;
 164 };
 165
 166 struct team_option {
 167         struct list_head list;
 168         const char *name;
 169         bool per_port;
 170         unsigned int array_size; /* != 0 means the option is array */
 171         enum team_option_type type;
 172         int (*init)(struct team *team, struct team_option_inst_info *info);
 173         int (*getter)(struct team *team, struct team_gsetter_ctx *ctx);
 174         int (*setter)(struct team *team, struct team_gsetter_ctx *ctx);
 175 };
 176
 177 extern void team_option_inst_set_change(struct team_option_inst_info *opt_inst_info);
 178 extern void team_options_change_check(struct team *team);
 179
 180 struct team_mode {
 181         const char *kind;
 182         struct module *owner;
 183         size_t priv_size;
 184         size_t port_priv_size;
 185         const struct team_mode_ops *ops;
 186         enum netdev_lag_tx_type lag_tx_type;
 187 };
 188
 189 #define TEAM_PORT_HASHBITS 4
 190 #define TEAM_PORT_HASHENTRIES (1 << TEAM_PORT_HASHBITS)
 191
 192 #define TEAM_MODE_PRIV_LONGS 4
 193 #define TEAM_MODE_PRIV_SIZE (sizeof(long) * TEAM_MODE_PRIV_LONGS)
 194
 195 struct team {
 196         struct net_device *dev; /* associated netdevice */
 197         struct team_pcpu_stats __percpu *pcpu_stats;
 198
 199         struct mutex lock; /* used for overall locking, e.g. port lists write */
 200
 201         /*
 202          * List of enabled ports and their count
 203          */
 204         int en_port_count;
 205         struct hlist_head en_port_hlist[TEAM_PORT_HASHENTRIES];
 206
 207         struct list_head port_list; /* list of all ports */
 208
 209         struct list_head option_list;
 210         struct list_head option_inst_list; /* list of option instances */
 211
 212         const struct team_mode *mode;
 213         struct team_mode_ops ops;
 214         bool user_carrier_enabled;
 215         bool queue_override_enabled;
 216         struct list_head *qom_lists; /* array of queue override mapping lists */
 217         bool port_mtu_change_allowed;
 218         struct {
 219                 unsigned int count;
 220                 unsigned int interval; /* in ms */
 221                 atomic_t count_pending;
 222                 struct delayed_work dw;
 223         } notify_peers;
 224         struct {
 225                 unsigned int count;
 226                 unsigned int interval; /* in ms */
 227                 atomic_t count_pending;
 228                 struct delayed_work dw;
 229         } mcast_rejoin;
 230         long mode_priv[TEAM_MODE_PRIV_LONGS];
 231 };
 232
 233 static inline int team_dev_queue_xmit(struct team *team, struct team_port *port,
 234                                       struct sk_buff *skb)
 235 {
 236         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 237                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 238         skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
 239
 240         skb->dev = port->dev;
 241         if (unlikely(netpoll_tx_running(team->dev))) {
 242                 team_netpoll_send_skb(port, skb);
 243                 return 0;
 244         }
 245         return dev_queue_xmit(skb);
 246 }
 247
 248 static inline struct hlist_head *team_port_index_hash(struct team *team,
 249                                                       int port_index)
 250 {
 251         return &team->en_port_hlist[port_index & (TEAM_PORT_HASHENTRIES - 1)];
 252 }
 253
 254 static inline struct team_port *team_get_port_by_index(struct team *team,
 255                                                        int port_index)
 256 {
 257         struct team_port *port;
 258         struct hlist_head *head = team_port_index_hash(team, port_index);
 259
 260         hlist_for_each_entry(port, head, hlist)
 261                 if (port->index == port_index)
 262                         return port;
 263         return NULL;
 264 }
 265
 266 static inline int team_num_to_port_index(struct team *team, unsigned int num)
 267 {
 268         int en_port_count = READ_ONCE(team->en_port_count);
 269
 270         if (unlikely(!en_port_count))
 271                 return 0;
 272         return num % en_port_count;
 273 }
 274
 275 static inline struct team_port *team_get_port_by_index_rcu(struct team *team,
 276                                                            int port_index)
 277 {
 278         struct team_port *port;
 279         struct hlist_head *head = team_port_index_hash(team, port_index);
 280
 281         hlist_for_each_entry_rcu(port, head, hlist)
 282                 if (port->index == port_index)
 283                         return port;
 284         return NULL;
 285 }
 286
 287 static inline struct team_port *
 288 team_get_first_port_txable_rcu(struct team *team, struct team_port *port)
 289 {
 290         struct team_port *cur;
 291
 292         if (likely(team_port_txable(port)))
 293                 return port;
 294         cur = port;
 295         list_for_each_entry_continue_rcu(cur, &team->port_list, list)
 296                 if (team_port_txable(cur))
 297                         return cur;
 298         list_for_each_entry_rcu(cur, &team->port_list, list) {
 299                 if (cur == port)
 300                         break;
 301                 if (team_port_txable(cur))
 302                         return cur;
 303         }
 304         return NULL;
 305 }
 306
 307 extern int team_options_register(struct team *team,
 308                                  const struct team_option *option,
 309                                  size_t option_count);
 310 extern void team_options_unregister(struct team *team,
 311                                     const struct team_option *option,
 312                                     size_t option_count);
 313 extern int team_mode_register(const struct team_mode *mode);
 314 extern void team_mode_unregister(const struct team_mode *mode);
 315
 316 #define TEAM_DEFAULT_NUM_TX_QUEUES 16
 317 #define TEAM_DEFAULT_NUM_RX_QUEUES 16
 318
 319 #define MODULE_ALIAS_TEAM_MODE(kind) MODULE_ALIAS("team-mode-" kind)
 320
 321 #endif /* _LINUX_IF_TEAM_H_ */