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Linux/include/linux/if_team.h

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  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 };
 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         bool port_mtu_change_allowed;
198         struct {
199                 unsigned int count;
200                 unsigned int interval; /* in ms */
201                 atomic_t count_pending;
202                 struct delayed_work dw;
203         } notify_peers;
204         struct {
205                 unsigned int count;
206                 unsigned int interval; /* in ms */
207                 atomic_t count_pending;
208                 struct delayed_work dw;
209         } mcast_rejoin;
210         long mode_priv[TEAM_MODE_PRIV_LONGS];
211 };
212 
213 static inline int team_dev_queue_xmit(struct team *team, struct team_port *port,
214                                       struct sk_buff *skb)
215 {
216         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
217                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
218         skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
219 
220         skb->dev = port->dev;
221         if (unlikely(netpoll_tx_running(team->dev))) {
222                 team_netpoll_send_skb(port, skb);
223                 return 0;
224         }
225         return dev_queue_xmit(skb);
226 }
227 
228 static inline struct hlist_head *team_port_index_hash(struct team *team,
229                                                       int port_index)
230 {
231         return &team->en_port_hlist[port_index & (TEAM_PORT_HASHENTRIES - 1)];
232 }
233 
234 static inline struct team_port *team_get_port_by_index(struct team *team,
235                                                        int port_index)
236 {
237         struct team_port *port;
238         struct hlist_head *head = team_port_index_hash(team, port_index);
239 
240         hlist_for_each_entry(port, head, hlist)
241                 if (port->index == port_index)
242                         return port;
243         return NULL;
244 }
245 
246 static inline int team_num_to_port_index(struct team *team, int num)
247 {
248         int en_port_count = ACCESS_ONCE(team->en_port_count);
249 
250         if (unlikely(!en_port_count))
251                 return 0;
252         return num % en_port_count;
253 }
254 
255 static inline struct team_port *team_get_port_by_index_rcu(struct team *team,
256                                                            int port_index)
257 {
258         struct team_port *port;
259         struct hlist_head *head = team_port_index_hash(team, port_index);
260 
261         hlist_for_each_entry_rcu(port, head, hlist)
262                 if (port->index == port_index)
263                         return port;
264         return NULL;
265 }
266 
267 static inline struct team_port *
268 team_get_first_port_txable_rcu(struct team *team, struct team_port *port)
269 {
270         struct team_port *cur;
271 
272         if (likely(team_port_txable(port)))
273                 return port;
274         cur = port;
275         list_for_each_entry_continue_rcu(cur, &team->port_list, list)
276                 if (team_port_txable(cur))
277                         return cur;
278         list_for_each_entry_rcu(cur, &team->port_list, list) {
279                 if (cur == port)
280                         break;
281                 if (team_port_txable(cur))
282                         return cur;
283         }
284         return NULL;
285 }
286 
287 extern int team_options_register(struct team *team,
288                                  const struct team_option *option,
289                                  size_t option_count);
290 extern void team_options_unregister(struct team *team,
291                                     const struct team_option *option,
292                                     size_t option_count);
293 extern int team_mode_register(const struct team_mode *mode);
294 extern void team_mode_unregister(const struct team_mode *mode);
295 
296 #define TEAM_DEFAULT_NUM_TX_QUEUES 16
297 #define TEAM_DEFAULT_NUM_RX_QUEUES 16
298 
299 #endif /* _LINUX_IF_TEAM_H_ */
300 

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