2 * net/tipc/port.h: Include file for TIPC port code
4 * Copyright (c) 1994-2007, Ericsson AB
5 * Copyright (c) 2004-2007, Wind River Systems
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9 * modification, are permitted provided that the following conditions are met:
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17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
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45 #include "node_subscr.h"
47 #define TIPC_FLOW_CONTROL_WIN 512
49 typedef void (*tipc_msg_err_event) (void *usr_handle, u32 portref,
50 struct sk_buff **buf, unsigned char const *data,
51 unsigned int size, int reason,
52 struct tipc_portid const *attmpt_destid);
54 typedef void (*tipc_named_msg_err_event) (void *usr_handle, u32 portref,
55 struct sk_buff **buf, unsigned char const *data,
56 unsigned int size, int reason,
57 struct tipc_name_seq const *attmpt_dest);
59 typedef void (*tipc_conn_shutdown_event) (void *usr_handle, u32 portref,
60 struct sk_buff **buf, unsigned char const *data,
61 unsigned int size, int reason);
63 typedef void (*tipc_msg_event) (void *usr_handle, u32 portref,
64 struct sk_buff **buf, unsigned char const *data,
65 unsigned int size, unsigned int importance,
66 struct tipc_portid const *origin);
68 typedef void (*tipc_named_msg_event) (void *usr_handle, u32 portref,
69 struct sk_buff **buf, unsigned char const *data,
70 unsigned int size, unsigned int importance,
71 struct tipc_portid const *orig,
72 struct tipc_name_seq const *dest);
74 typedef void (*tipc_conn_msg_event) (void *usr_handle, u32 portref,
75 struct sk_buff **buf, unsigned char const *data,
78 typedef void (*tipc_continue_event) (void *usr_handle, u32 portref);
81 * struct user_port - TIPC user port (used with native API)
82 * @user_ref: id of user who created user port
83 * @usr_handle: user-specified field
84 * @ref: object reference to associated TIPC port
85 * <various callback routines>
86 * @uport_list: adjacent user ports in list of ports held by user
93 tipc_msg_err_event err_cb;
94 tipc_named_msg_err_event named_err_cb;
95 tipc_conn_shutdown_event conn_err_cb;
96 tipc_msg_event msg_cb;
97 tipc_named_msg_event named_msg_cb;
98 tipc_conn_msg_event conn_msg_cb;
99 tipc_continue_event continue_event_cb;
100 struct list_head uport_list;
104 * struct tipc_port - TIPC port info available to socket API
105 * @usr_handle: pointer to additional user-defined information about port
106 * @lock: pointer to spinlock for controlling access to port
107 * @connected: non-zero if port is currently connected to a peer port
108 * @conn_type: TIPC type used when connection was established
109 * @conn_instance: TIPC instance used when connection was established
110 * @conn_unacked: number of unacknowledged messages received from peer port
111 * @published: non-zero if port has one or more associated names
112 * @congested: non-zero if cannot send because of link or port congestion
113 * @max_pkt: maximum packet size "hint" used when building messages sent by port
114 * @ref: unique reference to port in TIPC object registry
115 * @phdr: preformatted message header used when sending messages
128 struct tipc_msg phdr;
132 * struct port - TIPC port structure
133 * @publ: TIPC port info available to privileged users
134 * @port_list: adjacent ports in TIPC's global list of ports
135 * @dispatcher: ptr to routine which handles received messages
136 * @wakeup: ptr to routine to call when port is no longer congested
137 * @user_port: ptr to user port associated with port (if any)
138 * @wait_list: adjacent ports in list of ports waiting on link congestion
142 * @publications: list of publications for port
143 * @pub_count: total # of publications port has made during its lifetime
148 * @subscription: "node down" subscription used to terminate failed connections
152 struct tipc_port publ;
153 struct list_head port_list;
154 u32 (*dispatcher)(struct tipc_port *, struct sk_buff *);
155 void (*wakeup)(struct tipc_port *);
156 struct user_port *user_port;
157 struct list_head wait_list;
161 struct list_head publications;
164 u32 probing_interval;
166 struct timer_list timer;
167 struct tipc_node_subscr subscription;
170 extern spinlock_t tipc_port_list_lock;
174 * TIPC port manipulation routines
176 struct tipc_port *tipc_createport_raw(void *usr_handle,
177 u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
178 void (*wakeup)(struct tipc_port *), const u32 importance);
180 int tipc_reject_msg(struct sk_buff *buf, u32 err);
182 int tipc_send_buf_fast(struct sk_buff *buf, u32 destnode);
184 void tipc_acknowledge(u32 port_ref, u32 ack);
186 int tipc_createport(unsigned int tipc_user, void *usr_handle,
187 unsigned int importance, tipc_msg_err_event error_cb,
188 tipc_named_msg_err_event named_error_cb,
189 tipc_conn_shutdown_event conn_error_cb, tipc_msg_event msg_cb,
190 tipc_named_msg_event named_msg_cb,
191 tipc_conn_msg_event conn_msg_cb,
192 tipc_continue_event continue_event_cb, u32 *portref);
194 int tipc_deleteport(u32 portref);
196 int tipc_ownidentity(u32 portref, struct tipc_portid *port);
198 int tipc_portimportance(u32 portref, unsigned int *importance);
199 int tipc_set_portimportance(u32 portref, unsigned int importance);
201 int tipc_portunreliable(u32 portref, unsigned int *isunreliable);
202 int tipc_set_portunreliable(u32 portref, unsigned int isunreliable);
204 int tipc_portunreturnable(u32 portref, unsigned int *isunreturnable);
205 int tipc_set_portunreturnable(u32 portref, unsigned int isunreturnable);
207 int tipc_publish(u32 portref, unsigned int scope,
208 struct tipc_name_seq const *name_seq);
209 int tipc_withdraw(u32 portref, unsigned int scope,
210 struct tipc_name_seq const *name_seq);
212 int tipc_connect2port(u32 portref, struct tipc_portid const *port);
214 int tipc_disconnect(u32 portref);
216 int tipc_shutdown(u32 ref);
220 * The following routines require that the port be locked on entry
222 int tipc_disconnect_port(struct tipc_port *tp_ptr);
225 * TIPC messaging routines
227 #define TIPC_PORT_IMPORTANCE 100 /* send using current port setting */
229 int tipc_send(u32 portref, unsigned int num_sect, struct iovec const *msg_sect);
231 int tipc_send2name(u32 portref, struct tipc_name const *name, u32 domain,
232 unsigned int num_sect, struct iovec const *msg_sect);
234 int tipc_send2port(u32 portref, struct tipc_portid const *dest,
235 unsigned int num_sect, struct iovec const *msg_sect);
237 int tipc_send_buf2port(u32 portref, struct tipc_portid const *dest,
238 struct sk_buff *buf, unsigned int dsz);
240 int tipc_multicast(u32 portref, struct tipc_name_seq const *seq, u32 domain,
241 unsigned int section_count, struct iovec const *msg);
243 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
244 struct iovec const *msg_sect, u32 num_sect,
246 struct sk_buff *tipc_port_get_ports(void);
247 struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space);
248 void tipc_port_recv_proto_msg(struct sk_buff *buf);
249 void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp);
250 void tipc_port_reinit(void);
253 * tipc_port_lock - lock port instance referred to and return its pointer
256 static inline struct port *tipc_port_lock(u32 ref)
258 return (struct port *)tipc_ref_lock(ref);
262 * tipc_port_unlock - unlock a port instance
264 * Can use pointer instead of tipc_ref_unlock() since port is already locked.
267 static inline void tipc_port_unlock(struct port *p_ptr)
269 spin_unlock_bh(p_ptr->publ.lock);
272 static inline struct port* tipc_port_deref(u32 ref)
274 return (struct port *)tipc_ref_deref(ref);
277 static inline u32 tipc_peer_port(struct port *p_ptr)
279 return msg_destport(&p_ptr->publ.phdr);
282 static inline u32 tipc_peer_node(struct port *p_ptr)
284 return msg_destnode(&p_ptr->publ.phdr);
287 static inline int tipc_port_congested(struct port *p_ptr)
289 return (p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2);
293 * tipc_port_recv_msg - receive message from lower layer and deliver to port user
296 static inline int tipc_port_recv_msg(struct sk_buff *buf)
299 struct tipc_msg *msg = buf_msg(buf);
300 u32 destport = msg_destport(msg);
301 u32 dsz = msg_data_sz(msg);
304 /* forward unresolved named message */
305 if (unlikely(!destport)) {
306 tipc_net_route_msg(buf);
310 /* validate destination & pass to port, otherwise reject message */
311 p_ptr = tipc_port_lock(destport);
313 if (likely(p_ptr->publ.connected)) {
314 if ((unlikely(msg_origport(msg) != tipc_peer_port(p_ptr))) ||
315 (unlikely(msg_orignode(msg) != tipc_peer_node(p_ptr))) ||
316 (unlikely(!msg_connected(msg)))) {
317 err = TIPC_ERR_NO_PORT;
318 tipc_port_unlock(p_ptr);
322 err = p_ptr->dispatcher(&p_ptr->publ, buf);
323 tipc_port_unlock(p_ptr);
327 err = TIPC_ERR_NO_PORT;
330 dbg("port->rejecting, err = %x..\n",err);
331 return tipc_reject_msg(buf, err);