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Linux/include/linux/if_team.h

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  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 /*
  3  * include/linux/if_team.h - Network team device driver header
  4  * Copyright (c) 2011 Jiri Pirko <jpirko@redhat.com>
  5  */
  6 #ifndef _LINUX_IF_TEAM_H_
  7 #define _LINUX_IF_TEAM_H_
  8 
  9 #include <linux/netpoll.h>
 10 #include <net/sch_generic.h>
 11 #include <linux/types.h>
 12 #include <uapi/linux/if_team.h>
 13 
 14 struct team_pcpu_stats {
 15         u64                     rx_packets;
 16         u64                     rx_bytes;
 17         u64                     rx_multicast;
 18         u64                     tx_packets;
 19         u64                     tx_bytes;
 20         struct u64_stats_sync   syncp;
 21         u32                     rx_dropped;
 22         u32                     tx_dropped;
 23         u32                     rx_nohandler;
 24 };
 25 
 26 struct team;
 27 
 28 struct team_port {
 29         struct net_device *dev;
 30         struct hlist_node hlist; /* node in enabled ports hash list */
 31         struct list_head list; /* node in ordinary list */
 32         struct team *team;
 33         int index; /* index of enabled port. If disabled, it's set to -1 */
 34 
 35         bool linkup; /* either state.linkup or user.linkup */
 36 
 37         struct {
 38                 bool linkup;
 39                 u32 speed;
 40                 u8 duplex;
 41         } state;
 42 
 43         /* Values set by userspace */
 44         struct {
 45                 bool linkup;
 46                 bool linkup_enabled;
 47         } user;
 48 
 49         /* Custom gennetlink interface related flags */
 50         bool changed;
 51         bool removed;
 52 
 53         /*
 54          * A place for storing original values of the device before it
 55          * become a port.
 56          */
 57         struct {
 58                 unsigned char dev_addr[MAX_ADDR_LEN];
 59                 unsigned int mtu;
 60         } orig;
 61 
 62 #ifdef CONFIG_NET_POLL_CONTROLLER
 63         struct netpoll *np;
 64 #endif
 65 
 66         s32 priority; /* lower number ~ higher priority */
 67         u16 queue_id;
 68         struct list_head qom_list; /* node in queue override mapping list */
 69         struct rcu_head rcu;
 70         long mode_priv[0];
 71 };
 72 
 73 static inline struct team_port *team_port_get_rcu(const struct net_device *dev)
 74 {
 75         return rcu_dereference(dev->rx_handler_data);
 76 }
 77 
 78 static inline bool team_port_enabled(struct team_port *port)
 79 {
 80         return port->index != -1;
 81 }
 82 
 83 static inline bool team_port_txable(struct team_port *port)
 84 {
 85         return port->linkup && team_port_enabled(port);
 86 }
 87 
 88 static inline bool team_port_dev_txable(const struct net_device *port_dev)
 89 {
 90         struct team_port *port;
 91         bool txable;
 92 
 93         rcu_read_lock();
 94         port = team_port_get_rcu(port_dev);
 95         txable = port ? team_port_txable(port) : false;
 96         rcu_read_unlock();
 97 
 98         return txable;
 99 }
100 
101 #ifdef CONFIG_NET_POLL_CONTROLLER
102 static inline void team_netpoll_send_skb(struct team_port *port,
103                                          struct sk_buff *skb)
104 {
105         struct netpoll *np = port->np;
106 
107         if (np)
108                 netpoll_send_skb(np, skb);
109 }
110 #else
111 static inline void team_netpoll_send_skb(struct team_port *port,
112                                          struct sk_buff *skb)
113 {
114 }
115 #endif
116 
117 struct team_mode_ops {
118         int (*init)(struct team *team);
119         void (*exit)(struct team *team);
120         rx_handler_result_t (*receive)(struct team *team,
121                                        struct team_port *port,
122                                        struct sk_buff *skb);
123         bool (*transmit)(struct team *team, struct sk_buff *skb);
124         int (*port_enter)(struct team *team, struct team_port *port);
125         void (*port_leave)(struct team *team, struct team_port *port);
126         void (*port_change_dev_addr)(struct team *team, struct team_port *port);
127         void (*port_enabled)(struct team *team, struct team_port *port);
128         void (*port_disabled)(struct team *team, struct team_port *port);
129 };
130 
131 extern int team_modeop_port_enter(struct team *team, struct team_port *port);
132 extern void team_modeop_port_change_dev_addr(struct team *team,
133                                              struct team_port *port);
134 
135 enum team_option_type {
136         TEAM_OPTION_TYPE_U32,
137         TEAM_OPTION_TYPE_STRING,
138         TEAM_OPTION_TYPE_BINARY,
139         TEAM_OPTION_TYPE_BOOL,
140         TEAM_OPTION_TYPE_S32,
141 };
142 
143 struct team_option_inst_info {
144         u32 array_index;
145         struct team_port *port; /* != NULL if per-port */
146 };
147 
148 struct team_gsetter_ctx {
149         union {
150                 u32 u32_val;
151                 const char *str_val;
152                 struct {
153                         const void *ptr;
154                         u32 len;
155                 } bin_val;
156                 bool bool_val;
157                 s32 s32_val;
158         } data;
159         struct team_option_inst_info *info;
160 };
161 
162 struct team_option {
163         struct list_head list;
164         const char *name;
165         bool per_port;
166         unsigned int array_size; /* != 0 means the option is array */
167         enum team_option_type type;
168         int (*init)(struct team *team, struct team_option_inst_info *info);
169         int (*getter)(struct team *team, struct team_gsetter_ctx *ctx);
170         int (*setter)(struct team *team, struct team_gsetter_ctx *ctx);
171 };
172 
173 extern void team_option_inst_set_change(struct team_option_inst_info *opt_inst_info);
174 extern void team_options_change_check(struct team *team);
175 
176 struct team_mode {
177         const char *kind;
178         struct module *owner;
179         size_t priv_size;
180         size_t port_priv_size;
181         const struct team_mode_ops *ops;
182         enum netdev_lag_tx_type lag_tx_type;
183 };
184 
185 #define TEAM_PORT_HASHBITS 4
186 #define TEAM_PORT_HASHENTRIES (1 << TEAM_PORT_HASHBITS)
187 
188 #define TEAM_MODE_PRIV_LONGS 4
189 #define TEAM_MODE_PRIV_SIZE (sizeof(long) * TEAM_MODE_PRIV_LONGS)
190 
191 struct team {
192         struct net_device *dev; /* associated netdevice */
193         struct team_pcpu_stats __percpu *pcpu_stats;
194 
195         struct mutex lock; /* used for overall locking, e.g. port lists write */
196 
197         /*
198          * List of enabled ports and their count
199          */
200         int en_port_count;
201         struct hlist_head en_port_hlist[TEAM_PORT_HASHENTRIES];
202 
203         struct list_head port_list; /* list of all ports */
204 
205         struct list_head option_list;
206         struct list_head option_inst_list; /* list of option instances */
207 
208         const struct team_mode *mode;
209         struct team_mode_ops ops;
210         bool user_carrier_enabled;
211         bool queue_override_enabled;
212         struct list_head *qom_lists; /* array of queue override mapping lists */
213         bool port_mtu_change_allowed;
214         struct {
215                 unsigned int count;
216                 unsigned int interval; /* in ms */
217                 atomic_t count_pending;
218                 struct delayed_work dw;
219         } notify_peers;
220         struct {
221                 unsigned int count;
222                 unsigned int interval; /* in ms */
223                 atomic_t count_pending;
224                 struct delayed_work dw;
225         } mcast_rejoin;
226         long mode_priv[TEAM_MODE_PRIV_LONGS];
227 };
228 
229 static inline int team_dev_queue_xmit(struct team *team, struct team_port *port,
230                                       struct sk_buff *skb)
231 {
232         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
233                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
234         skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
235 
236         skb->dev = port->dev;
237         if (unlikely(netpoll_tx_running(team->dev))) {
238                 team_netpoll_send_skb(port, skb);
239                 return 0;
240         }
241         return dev_queue_xmit(skb);
242 }
243 
244 static inline struct hlist_head *team_port_index_hash(struct team *team,
245                                                       int port_index)
246 {
247         return &team->en_port_hlist[port_index & (TEAM_PORT_HASHENTRIES - 1)];
248 }
249 
250 static inline struct team_port *team_get_port_by_index(struct team *team,
251                                                        int port_index)
252 {
253         struct team_port *port;
254         struct hlist_head *head = team_port_index_hash(team, port_index);
255 
256         hlist_for_each_entry(port, head, hlist)
257                 if (port->index == port_index)
258                         return port;
259         return NULL;
260 }
261 
262 static inline int team_num_to_port_index(struct team *team, unsigned int num)
263 {
264         int en_port_count = READ_ONCE(team->en_port_count);
265 
266         if (unlikely(!en_port_count))
267                 return 0;
268         return num % en_port_count;
269 }
270 
271 static inline struct team_port *team_get_port_by_index_rcu(struct team *team,
272                                                            int port_index)
273 {
274         struct team_port *port;
275         struct hlist_head *head = team_port_index_hash(team, port_index);
276 
277         hlist_for_each_entry_rcu(port, head, hlist)
278                 if (port->index == port_index)
279                         return port;
280         return NULL;
281 }
282 
283 static inline struct team_port *
284 team_get_first_port_txable_rcu(struct team *team, struct team_port *port)
285 {
286         struct team_port *cur;
287 
288         if (likely(team_port_txable(port)))
289                 return port;
290         cur = port;
291         list_for_each_entry_continue_rcu(cur, &team->port_list, list)
292                 if (team_port_txable(cur))
293                         return cur;
294         list_for_each_entry_rcu(cur, &team->port_list, list) {
295                 if (cur == port)
296                         break;
297                 if (team_port_txable(cur))
298                         return cur;
299         }
300         return NULL;
301 }
302 
303 extern int team_options_register(struct team *team,
304                                  const struct team_option *option,
305                                  size_t option_count);
306 extern void team_options_unregister(struct team *team,
307                                     const struct team_option *option,
308                                     size_t option_count);
309 extern int team_mode_register(const struct team_mode *mode);
310 extern void team_mode_unregister(const struct team_mode *mode);
311 
312 #define TEAM_DEFAULT_NUM_TX_QUEUES 16
313 #define TEAM_DEFAULT_NUM_RX_QUEUES 16
314 
315 #define MODULE_ALIAS_TEAM_MODE(kind) MODULE_ALIAS("team-mode-" kind)
316 
317 #endif /* _LINUX_IF_TEAM_H_ */
318 

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