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1 | /* | |
2 | * net/tipc/port.h: Include file for TIPC port code | |
3 | * | |
4 | * Copyright (c) 1994-2007, Ericsson AB | |
5 | * Copyright (c) 2004-2007, 2010-2011, Wind River Systems | |
6 | * All rights reserved. | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions are met: | |
10 | * | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the names of the copyright holders nor the names of its | |
17 | * contributors may be used to endorse or promote products derived from | |
18 | * this software without specific prior written permission. | |
19 | * | |
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. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
34 | * POSSIBILITY OF SUCH DAMAGE. | |
35 | */ | |
36 | ||
37 | #ifndef _TIPC_PORT_H | |
38 | #define _TIPC_PORT_H | |
39 | ||
40 | #include "ref.h" | |
41 | #include "net.h" | |
42 | #include "msg.h" | |
43 | #include "node_subscr.h" | |
44 | ||
45 | #define TIPC_FLOW_CONTROL_WIN 512 | |
46 | ||
47 | typedef void (*tipc_msg_err_event) (void *usr_handle, u32 portref, | |
48 | struct sk_buff **buf, unsigned char const *data, | |
49 | unsigned int size, int reason, | |
50 | struct tipc_portid const *attmpt_destid); | |
51 | ||
52 | typedef void (*tipc_named_msg_err_event) (void *usr_handle, u32 portref, | |
53 | struct sk_buff **buf, unsigned char const *data, | |
54 | unsigned int size, int reason, | |
55 | struct tipc_name_seq const *attmpt_dest); | |
56 | ||
57 | typedef void (*tipc_conn_shutdown_event) (void *usr_handle, u32 portref, | |
58 | struct sk_buff **buf, unsigned char const *data, | |
59 | unsigned int size, int reason); | |
60 | ||
61 | typedef void (*tipc_msg_event) (void *usr_handle, u32 portref, | |
62 | struct sk_buff **buf, unsigned char const *data, | |
63 | unsigned int size, unsigned int importance, | |
64 | struct tipc_portid const *origin); | |
65 | ||
66 | typedef void (*tipc_named_msg_event) (void *usr_handle, u32 portref, | |
67 | struct sk_buff **buf, unsigned char const *data, | |
68 | unsigned int size, unsigned int importance, | |
69 | struct tipc_portid const *orig, | |
70 | struct tipc_name_seq const *dest); | |
71 | ||
72 | typedef void (*tipc_conn_msg_event) (void *usr_handle, u32 portref, | |
73 | struct sk_buff **buf, unsigned char const *data, | |
74 | unsigned int size); | |
75 | ||
76 | typedef void (*tipc_continue_event) (void *usr_handle, u32 portref); | |
77 | ||
78 | /** | |
79 | * struct user_port - TIPC user port (used with native API) | |
80 | * @usr_handle: user-specified field | |
81 | * @ref: object reference to associated TIPC port | |
82 | * <various callback routines> | |
83 | */ | |
84 | ||
85 | struct user_port { | |
86 | void *usr_handle; | |
87 | u32 ref; | |
88 | tipc_msg_err_event err_cb; | |
89 | tipc_named_msg_err_event named_err_cb; | |
90 | tipc_conn_shutdown_event conn_err_cb; | |
91 | tipc_msg_event msg_cb; | |
92 | tipc_named_msg_event named_msg_cb; | |
93 | tipc_conn_msg_event conn_msg_cb; | |
94 | tipc_continue_event continue_event_cb; | |
95 | }; | |
96 | ||
97 | /** | |
98 | * struct tipc_port - TIPC port structure | |
99 | * @usr_handle: pointer to additional user-defined information about port | |
100 | * @lock: pointer to spinlock for controlling access to port | |
101 | * @connected: non-zero if port is currently connected to a peer port | |
102 | * @conn_type: TIPC type used when connection was established | |
103 | * @conn_instance: TIPC instance used when connection was established | |
104 | * @conn_unacked: number of unacknowledged messages received from peer port | |
105 | * @published: non-zero if port has one or more associated names | |
106 | * @congested: non-zero if cannot send because of link or port congestion | |
107 | * @max_pkt: maximum packet size "hint" used when building messages sent by port | |
108 | * @ref: unique reference to port in TIPC object registry | |
109 | * @phdr: preformatted message header used when sending messages | |
110 | * @port_list: adjacent ports in TIPC's global list of ports | |
111 | * @dispatcher: ptr to routine which handles received messages | |
112 | * @wakeup: ptr to routine to call when port is no longer congested | |
113 | * @user_port: ptr to user port associated with port (if any) | |
114 | * @wait_list: adjacent ports in list of ports waiting on link congestion | |
115 | * @waiting_pkts: | |
116 | * @sent: # of non-empty messages sent by port | |
117 | * @acked: # of non-empty message acknowledgements from connected port's peer | |
118 | * @publications: list of publications for port | |
119 | * @pub_count: total # of publications port has made during its lifetime | |
120 | * @probing_state: | |
121 | * @probing_interval: | |
122 | * @timer_ref: | |
123 | * @subscription: "node down" subscription used to terminate failed connections | |
124 | */ | |
125 | struct tipc_port { | |
126 | void *usr_handle; | |
127 | spinlock_t *lock; | |
128 | int connected; | |
129 | u32 conn_type; | |
130 | u32 conn_instance; | |
131 | u32 conn_unacked; | |
132 | int published; | |
133 | u32 congested; | |
134 | u32 max_pkt; | |
135 | u32 ref; | |
136 | struct tipc_msg phdr; | |
137 | struct list_head port_list; | |
138 | u32 (*dispatcher)(struct tipc_port *, struct sk_buff *); | |
139 | void (*wakeup)(struct tipc_port *); | |
140 | struct user_port *user_port; | |
141 | struct list_head wait_list; | |
142 | u32 waiting_pkts; | |
143 | u32 sent; | |
144 | u32 acked; | |
145 | struct list_head publications; | |
146 | u32 pub_count; | |
147 | u32 probing_state; | |
148 | u32 probing_interval; | |
149 | struct timer_list timer; | |
150 | struct tipc_node_subscr subscription; | |
151 | }; | |
152 | ||
153 | extern spinlock_t tipc_port_list_lock; | |
154 | struct tipc_port_list; | |
155 | ||
156 | /* | |
157 | * TIPC port manipulation routines | |
158 | */ | |
159 | struct tipc_port *tipc_createport_raw(void *usr_handle, | |
160 | u32 (*dispatcher)(struct tipc_port *, struct sk_buff *), | |
161 | void (*wakeup)(struct tipc_port *), const u32 importance); | |
162 | ||
163 | int tipc_reject_msg(struct sk_buff *buf, u32 err); | |
164 | ||
165 | int tipc_send_buf_fast(struct sk_buff *buf, u32 destnode); | |
166 | ||
167 | void tipc_acknowledge(u32 port_ref, u32 ack); | |
168 | ||
169 | int tipc_createport(void *usr_handle, | |
170 | unsigned int importance, tipc_msg_err_event error_cb, | |
171 | tipc_named_msg_err_event named_error_cb, | |
172 | tipc_conn_shutdown_event conn_error_cb, tipc_msg_event msg_cb, | |
173 | tipc_named_msg_event named_msg_cb, | |
174 | tipc_conn_msg_event conn_msg_cb, | |
175 | tipc_continue_event continue_event_cb, u32 *portref); | |
176 | ||
177 | int tipc_deleteport(u32 portref); | |
178 | ||
179 | int tipc_portimportance(u32 portref, unsigned int *importance); | |
180 | int tipc_set_portimportance(u32 portref, unsigned int importance); | |
181 | ||
182 | int tipc_portunreliable(u32 portref, unsigned int *isunreliable); | |
183 | int tipc_set_portunreliable(u32 portref, unsigned int isunreliable); | |
184 | ||
185 | int tipc_portunreturnable(u32 portref, unsigned int *isunreturnable); | |
186 | int tipc_set_portunreturnable(u32 portref, unsigned int isunreturnable); | |
187 | ||
188 | int tipc_publish(u32 portref, unsigned int scope, | |
189 | struct tipc_name_seq const *name_seq); | |
190 | int tipc_withdraw(u32 portref, unsigned int scope, | |
191 | struct tipc_name_seq const *name_seq); | |
192 | ||
193 | int tipc_connect2port(u32 portref, struct tipc_portid const *port); | |
194 | ||
195 | int tipc_disconnect(u32 portref); | |
196 | ||
197 | int tipc_shutdown(u32 ref); | |
198 | ||
199 | ||
200 | /* | |
201 | * The following routines require that the port be locked on entry | |
202 | */ | |
203 | int tipc_disconnect_port(struct tipc_port *tp_ptr); | |
204 | ||
205 | /* | |
206 | * TIPC messaging routines | |
207 | */ | |
208 | int tipc_port_recv_msg(struct sk_buff *buf); | |
209 | int tipc_send(u32 portref, unsigned int num_sect, struct iovec const *msg_sect, | |
210 | unsigned int total_len); | |
211 | ||
212 | int tipc_send2name(u32 portref, struct tipc_name const *name, u32 domain, | |
213 | unsigned int num_sect, struct iovec const *msg_sect, | |
214 | unsigned int total_len); | |
215 | ||
216 | int tipc_send2port(u32 portref, struct tipc_portid const *dest, | |
217 | unsigned int num_sect, struct iovec const *msg_sect, | |
218 | unsigned int total_len); | |
219 | ||
220 | int tipc_send_buf2port(u32 portref, struct tipc_portid const *dest, | |
221 | struct sk_buff *buf, unsigned int dsz); | |
222 | ||
223 | int tipc_multicast(u32 portref, struct tipc_name_seq const *seq, | |
224 | unsigned int section_count, struct iovec const *msg, | |
225 | unsigned int total_len); | |
226 | ||
227 | int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr, | |
228 | struct iovec const *msg_sect, u32 num_sect, | |
229 | unsigned int total_len, int err); | |
230 | struct sk_buff *tipc_port_get_ports(void); | |
231 | void tipc_port_recv_proto_msg(struct sk_buff *buf); | |
232 | void tipc_port_recv_mcast(struct sk_buff *buf, struct tipc_port_list *dp); | |
233 | void tipc_port_reinit(void); | |
234 | ||
235 | /** | |
236 | * tipc_port_lock - lock port instance referred to and return its pointer | |
237 | */ | |
238 | ||
239 | static inline struct tipc_port *tipc_port_lock(u32 ref) | |
240 | { | |
241 | return (struct tipc_port *)tipc_ref_lock(ref); | |
242 | } | |
243 | ||
244 | /** | |
245 | * tipc_port_unlock - unlock a port instance | |
246 | * | |
247 | * Can use pointer instead of tipc_ref_unlock() since port is already locked. | |
248 | */ | |
249 | ||
250 | static inline void tipc_port_unlock(struct tipc_port *p_ptr) | |
251 | { | |
252 | spin_unlock_bh(p_ptr->lock); | |
253 | } | |
254 | ||
255 | static inline struct tipc_port *tipc_port_deref(u32 ref) | |
256 | { | |
257 | return (struct tipc_port *)tipc_ref_deref(ref); | |
258 | } | |
259 | ||
260 | static inline int tipc_port_congested(struct tipc_port *p_ptr) | |
261 | { | |
262 | return (p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2); | |
263 | } | |
264 | ||
265 | #endif |