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 bool team_port_enabled(struct team_port *port)
  78 {
  79         return port->index != -1;
  80 }
  81
  82 static inline bool team_port_txable(struct team_port *port)
  83 {
  84         return port->linkup && team_port_enabled(port);
  85 }
  86
  87 #ifdef CONFIG_NET_POLL_CONTROLLER
  88 static inline void team_netpoll_send_skb(struct team_port *port,
  89                                          struct sk_buff *skb)
  90 {
  91         struct netpoll *np = port->np;
  92
  93         if (np)
  94                 netpoll_send_skb(np, skb);
  95 }
  96 #else
  97 static inline void team_netpoll_send_skb(struct team_port *port,
  98                                          struct sk_buff *skb)
  99 {
 100 }
 101 #endif
 102
 103 struct team_mode_ops {
 104         int (*init)(struct team *team);
 105         void (*exit)(struct team *team);
 106         rx_handler_result_t (*receive)(struct team *team,
 107                                        struct team_port *port,
 108                                        struct sk_buff *skb);
 109         bool (*transmit)(struct team *team, struct sk_buff *skb);
 110         int (*port_enter)(struct team *team, struct team_port *port);
 111         void (*port_leave)(struct team *team, struct team_port *port);
 112         void (*port_change_dev_addr)(struct team *team, struct team_port *port);
 113         void (*port_enabled)(struct team *team, struct team_port *port);
 114         void (*port_disabled)(struct team *team, struct team_port *port);
 115 };
 116
 117 extern int team_modeop_port_enter(struct team *team, struct team_port *port);
 118 extern void team_modeop_port_change_dev_addr(struct team *team,
 119                                              struct team_port *port);
 120
 121 enum team_option_type {
 122         TEAM_OPTION_TYPE_U32,
 123         TEAM_OPTION_TYPE_STRING,
 124         TEAM_OPTION_TYPE_BINARY,
 125         TEAM_OPTION_TYPE_BOOL,
 126         TEAM_OPTION_TYPE_S32,
 127 };
 128
 129 struct team_option_inst_info {
 130         u32 array_index;
 131         struct team_port *port; /* != NULL if per-port */
 132 };
 133
 134 struct team_gsetter_ctx {
 135         union {
 136                 u32 u32_val;
 137                 const char *str_val;
 138                 struct {
 139                         const void *ptr;
 140                         u32 len;
 141                 } bin_val;
 142                 bool bool_val;
 143                 s32 s32_val;
 144         } data;
 145         struct team_option_inst_info *info;
 146 };
 147
 148 struct team_option {
 149         struct list_head list;
 150         const char *name;
 151         bool per_port;
 152         unsigned int array_size; /* != 0 means the option is array */
 153         enum team_option_type type;
 154         int (*init)(struct team *team, struct team_option_inst_info *info);
 155         int (*getter)(struct team *team, struct team_gsetter_ctx *ctx);
 156         int (*setter)(struct team *team, struct team_gsetter_ctx *ctx);
 157 };
 158
 159 extern void team_option_inst_set_change(struct team_option_inst_info *opt_inst_info);
 160 extern void team_options_change_check(struct team *team);
 161
 162 struct team_mode {
 163         const char *kind;
 164         struct module *owner;
 165         size_t priv_size;
 166         size_t port_priv_size;
 167         const struct team_mode_ops *ops;
 168         enum netdev_lag_tx_type lag_tx_type;
 169 };
 170
 171 #define TEAM_PORT_HASHBITS 4
 172 #define TEAM_PORT_HASHENTRIES (1 << TEAM_PORT_HASHBITS)
 173
 174 #define TEAM_MODE_PRIV_LONGS 4
 175 #define TEAM_MODE_PRIV_SIZE (sizeof(long) * TEAM_MODE_PRIV_LONGS)
 176
 177 struct team {
 178         struct net_device *dev; /* associated netdevice */
 179         struct team_pcpu_stats __percpu *pcpu_stats;
 180
 181         struct mutex lock; /* used for overall locking, e.g. port lists write */
 182
 183         /*
 184          * List of enabled ports and their count
 185          */
 186         int en_port_count;
 187         struct hlist_head en_port_hlist[TEAM_PORT_HASHENTRIES];
 188
 189         struct list_head port_list; /* list of all ports */
 190
 191         struct list_head option_list;
 192         struct list_head option_inst_list; /* list of option instances */
 193
 194         const struct team_mode *mode;
 195         struct team_mode_ops ops;
 196         bool user_carrier_enabled;
 197         bool queue_override_enabled;
 198         struct list_head *qom_lists; /* array of queue override mapping lists */
 199         bool port_mtu_change_allowed;
 200         struct {
 201                 unsigned int count;
 202                 unsigned int interval; /* in ms */
 203                 atomic_t count_pending;
 204                 struct delayed_work dw;
 205         } notify_peers;
 206         struct {
 207                 unsigned int count;
 208                 unsigned int interval; /* in ms */
 209                 atomic_t count_pending;
 210                 struct delayed_work dw;
 211         } mcast_rejoin;
 212         long mode_priv[TEAM_MODE_PRIV_LONGS];
 213 };
 214
 215 static inline int team_dev_queue_xmit(struct team *team, struct team_port *port,
 216                                       struct sk_buff *skb)
 217 {
 218         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 219                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 220         skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
 221
 222         skb->dev = port->dev;
 223         if (unlikely(netpoll_tx_running(team->dev))) {
 224                 team_netpoll_send_skb(port, skb);
 225                 return 0;
 226         }
 227         return dev_queue_xmit(skb);
 228 }
 229
 230 static inline struct hlist_head *team_port_index_hash(struct team *team,
 231                                                       int port_index)
 232 {
 233         return &team->en_port_hlist[port_index & (TEAM_PORT_HASHENTRIES - 1)];
 234 }
 235
 236 static inline struct team_port *team_get_port_by_index(struct team *team,
 237                                                        int port_index)
 238 {
 239         struct team_port *port;
 240         struct hlist_head *head = team_port_index_hash(team, port_index);
 241
 242         hlist_for_each_entry(port, head, hlist)
 243                 if (port->index == port_index)
 244                         return port;
 245         return NULL;
 246 }
 247
 248 static inline int team_num_to_port_index(struct team *team, int num)
 249 {
 250         int en_port_count = ACCESS_ONCE(team->en_port_count);
 251
 252         if (unlikely(!en_port_count))
 253                 return 0;
 254         return num % en_port_count;
 255 }
 256
 257 static inline struct team_port *team_get_port_by_index_rcu(struct team *team,
 258                                                            int port_index)
 259 {
 260         struct team_port *port;
 261         struct hlist_head *head = team_port_index_hash(team, port_index);
 262
 263         hlist_for_each_entry_rcu(port, head, hlist)
 264                 if (port->index == port_index)
 265                         return port;
 266         return NULL;
 267 }
 268
 269 static inline struct team_port *
 270 team_get_first_port_txable_rcu(struct team *team, struct team_port *port)
 271 {
 272         struct team_port *cur;
 273
 274         if (likely(team_port_txable(port)))
 275                 return port;
 276         cur = port;
 277         list_for_each_entry_continue_rcu(cur, &team->port_list, list)
 278                 if (team_port_txable(cur))
 279                         return cur;
 280         list_for_each_entry_rcu(cur, &team->port_list, list) {
 281                 if (cur == port)
 282                         break;
 283                 if (team_port_txable(cur))
 284                         return cur;
 285         }
 286         return NULL;
 287 }
 288
 289 extern int team_options_register(struct team *team,
 290                                  const struct team_option *option,
 291                                  size_t option_count);
 292 extern void team_options_unregister(struct team *team,
 293                                     const struct team_option *option,
 294                                     size_t option_count);
 295 extern int team_mode_register(const struct team_mode *mode);
 296 extern void team_mode_unregister(const struct team_mode *mode);
 297
 298 #define TEAM_DEFAULT_NUM_TX_QUEUES 16
 299 #define TEAM_DEFAULT_NUM_RX_QUEUES 16
 300
 301 #endif /* _LINUX_IF_TEAM_H_ */