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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         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, unsigned int num)
249 {
250         int en_port_count = READ_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 #define MODULE_ALIAS_TEAM_MODE(kind) MODULE_ALIAS("team-mode-" kind)
302 
303 #endif /* _LINUX_IF_TEAM_H_ */
304 

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