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
  14 #include <linux/netpoll.h>
  15 #include <net/sch_generic.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 };
  28
  29 struct team;
  30
  31 struct team_port {
  32         struct net_device *dev;
  33         struct hlist_node hlist; /* node in enabled ports hash list */
  34         struct list_head list; /* node in ordinary list */
  35         struct team *team;
  36         int index; /* index of enabled port. If disabled, it's set to -1 */
  37
  38         bool linkup; /* either state.linkup or user.linkup */
  39
  40         struct {
  41                 bool linkup;
  42                 u32 speed;
  43                 u8 duplex;
  44         } state;
  45
  46         /* Values set by userspace */
  47         struct {
  48                 bool linkup;
  49                 bool linkup_enabled;
  50         } user;
  51
  52         /* Custom gennetlink interface related flags */
  53         bool changed;
  54         bool removed;
  55
  56         /*
  57          * A place for storing original values of the device before it
  58          * become a port.
  59          */
  60         struct {
  61                 unsigned char dev_addr[MAX_ADDR_LEN];
  62                 unsigned int mtu;
  63         } orig;
  64
  65 #ifdef CONFIG_NET_POLL_CONTROLLER
  66         struct netpoll *np;
  67 #endif
  68
  69         s32 priority; /* lower number ~ higher priority */
  70         u16 queue_id;
  71         struct list_head qom_list; /* node in queue override mapping list */
  72         struct rcu_head rcu;
  73         long mode_priv[0];
  74 };
  75
  76 static inline bool team_port_enabled(struct team_port *port)
  77 {
  78         return port->index != -1;
  79 }
  80
  81 static inline bool team_port_txable(struct team_port *port)
  82 {
  83         return port->linkup && team_port_enabled(port);
  84 }
  85
  86 #ifdef CONFIG_NET_POLL_CONTROLLER
  87 static inline void team_netpoll_send_skb(struct team_port *port,
  88                                          struct sk_buff *skb)
  89 {
  90         struct netpoll *np = port->np;
  91
  92         if (np)
  93                 netpoll_send_skb(np, skb);
  94 }
  95 #else
  96 static inline void team_netpoll_send_skb(struct team_port *port,
  97                                          struct sk_buff *skb)
  98 {
  99 }
 100 #endif
 101
 102 struct team_mode_ops {
 103         int (*init)(struct team *team);
 104         void (*exit)(struct team *team);
 105         rx_handler_result_t (*receive)(struct team *team,
 106                                        struct team_port *port,
 107                                        struct sk_buff *skb);
 108         bool (*transmit)(struct team *team, struct sk_buff *skb);
 109         int (*port_enter)(struct team *team, struct team_port *port);
 110         void (*port_leave)(struct team *team, struct team_port *port);
 111         void (*port_change_dev_addr)(struct team *team, struct team_port *port);
 112         void (*port_enabled)(struct team *team, struct team_port *port);
 113         void (*port_disabled)(struct team *team, struct team_port *port);
 114 };
 115
 116 extern int team_modeop_port_enter(struct team *team, struct team_port *port);
 117 extern void team_modeop_port_change_dev_addr(struct team *team,
 118                                              struct team_port *port);
 119
 120 enum team_option_type {
 121         TEAM_OPTION_TYPE_U32,
 122         TEAM_OPTION_TYPE_STRING,
 123         TEAM_OPTION_TYPE_BINARY,
 124         TEAM_OPTION_TYPE_BOOL,
 125         TEAM_OPTION_TYPE_S32,
 126 };
 127
 128 struct team_option_inst_info {
 129         u32 array_index;
 130         struct team_port *port; /* != NULL if per-port */
 131 };
 132
 133 struct team_gsetter_ctx {
 134         union {
 135                 u32 u32_val;
 136                 const char *str_val;
 137                 struct {
 138                         const void *ptr;
 139                         u32 len;
 140                 } bin_val;
 141                 bool bool_val;
 142                 s32 s32_val;
 143         } data;
 144         struct team_option_inst_info *info;
 145 };
 146
 147 struct team_option {
 148         struct list_head list;
 149         const char *name;
 150         bool per_port;
 151         unsigned int array_size; /* != 0 means the option is array */
 152         enum team_option_type type;
 153         int (*init)(struct team *team, struct team_option_inst_info *info);
 154         int (*getter)(struct team *team, struct team_gsetter_ctx *ctx);
 155         int (*setter)(struct team *team, struct team_gsetter_ctx *ctx);
 156 };
 157
 158 extern void team_option_inst_set_change(struct team_option_inst_info *opt_inst_info);
 159 extern void team_options_change_check(struct team *team);
 160
 161 struct team_mode {
 162         const char *kind;
 163         struct module *owner;
 164         size_t priv_size;
 165         size_t port_priv_size;
 166         const struct team_mode_ops *ops;
 167 };
 168
 169 #define TEAM_PORT_HASHBITS 4
 170 #define TEAM_PORT_HASHENTRIES (1 << TEAM_PORT_HASHBITS)
 171
 172 #define TEAM_MODE_PRIV_LONGS 4
 173 #define TEAM_MODE_PRIV_SIZE (sizeof(long) * TEAM_MODE_PRIV_LONGS)
 174
 175 struct team {
 176         struct net_device *dev; /* associated netdevice */
 177         struct team_pcpu_stats __percpu *pcpu_stats;
 178
 179         struct mutex lock; /* used for overall locking, e.g. port lists write */
 180
 181         /*
 182          * List of enabled ports and their count
 183          */
 184         int en_port_count;
 185         struct hlist_head en_port_hlist[TEAM_PORT_HASHENTRIES];
 186
 187         struct list_head port_list; /* list of all ports */
 188
 189         struct list_head option_list;
 190         struct list_head option_inst_list; /* list of option instances */
 191
 192         const struct team_mode *mode;
 193         struct team_mode_ops ops;
 194         bool user_carrier_enabled;
 195         bool queue_override_enabled;
 196         struct list_head *qom_lists; /* array of queue override mapping lists */
 197         long mode_priv[TEAM_MODE_PRIV_LONGS];
 198 };
 199
 200 static inline int team_dev_queue_xmit(struct team *team, struct team_port *port,
 201                                       struct sk_buff *skb)
 202 {
 203         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 204                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 205         skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
 206
 207         skb->dev = port->dev;
 208         if (unlikely(netpoll_tx_running(team->dev))) {
 209                 team_netpoll_send_skb(port, skb);
 210                 return 0;
 211         }
 212         return dev_queue_xmit(skb);
 213 }
 214
 215 static inline struct hlist_head *team_port_index_hash(struct team *team,
 216                                                       int port_index)
 217 {
 218         return &team->en_port_hlist[port_index & (TEAM_PORT_HASHENTRIES - 1)];
 219 }
 220
 221 static inline struct team_port *team_get_port_by_index(struct team *team,
 222                                                        int port_index)
 223 {
 224         struct team_port *port;
 225         struct hlist_head *head = team_port_index_hash(team, port_index);
 226
 227         hlist_for_each_entry(port, head, hlist)
 228                 if (port->index == port_index)
 229                         return port;
 230         return NULL;
 231 }
 232
 233 static inline int team_num_to_port_index(struct team *team, int num)
 234 {
 235         int en_port_count = ACCESS_ONCE(team->en_port_count);
 236
 237         if (unlikely(!en_port_count))
 238                 return 0;
 239         return num % en_port_count;
 240 }
 241
 242 static inline struct team_port *team_get_port_by_index_rcu(struct team *team,
 243                                                            int port_index)
 244 {
 245         struct team_port *port;
 246         struct hlist_head *head = team_port_index_hash(team, port_index);
 247
 248         hlist_for_each_entry_rcu(port, head, hlist)
 249                 if (port->index == port_index)
 250                         return port;
 251         return NULL;
 252 }
 253
 254 static inline struct team_port *
 255 team_get_first_port_txable_rcu(struct team *team, struct team_port *port)
 256 {
 257         struct team_port *cur;
 258
 259         if (likely(team_port_txable(port)))
 260                 return port;
 261         cur = port;
 262         list_for_each_entry_continue_rcu(cur, &team->port_list, list)
 263                 if (team_port_txable(cur))
 264                         return cur;
 265         list_for_each_entry_rcu(cur, &team->port_list, list) {
 266                 if (cur == port)
 267                         break;
 268                 if (team_port_txable(cur))
 269                         return cur;
 270         }
 271         return NULL;
 272 }
 273
 274 extern int team_options_register(struct team *team,
 275                                  const struct team_option *option,
 276                                  size_t option_count);
 277 extern void team_options_unregister(struct team *team,
 278                                     const struct team_option *option,
 279                                     size_t option_count);
 280 extern int team_mode_register(const struct team_mode *mode);
 281 extern void team_mode_unregister(const struct team_mode *mode);
 282
 283 #define TEAM_DEFAULT_NUM_TX_QUEUES 16
 284 #define TEAM_DEFAULT_NUM_RX_QUEUES 16
 285
 286 #endif /* _LINUX_IF_TEAM_H_ */