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1/*
2 * net/tipc/port.h: Include file for TIPC port code
3 *
4 * Copyright (c) 1994-2007, 2014, Ericsson AB
5 * Copyright (c) 2004-2007, 2010-2013, 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_CONNACK_INTV 256
46#define TIPC_FLOWCTRL_WIN (TIPC_CONNACK_INTV * 2)
47#define TIPC_CONN_OVERLOAD_LIMIT ((TIPC_FLOWCTRL_WIN * 2 + 1) * \
48 SKB_TRUESIZE(TIPC_MAX_USER_MSG_SIZE))
49
50/**
51 * struct tipc_port - TIPC port structure
52 * @lock: pointer to spinlock for controlling access to port
53 * @connected: non-zero if port is currently connected to a peer port
54 * @conn_type: TIPC type used when connection was established
55 * @conn_instance: TIPC instance used when connection was established
56 * @published: non-zero if port has one or more associated names
57 * @max_pkt: maximum packet size "hint" used when building messages sent by port
58 * @ref: unique reference to port in TIPC object registry
59 * @phdr: preformatted message header used when sending messages
60 * @port_list: adjacent ports in TIPC's global list of ports
61 * @wait_list: adjacent ports in list of ports waiting on link congestion
62 * @waiting_pkts:
63 * @publications: list of publications for port
64 * @pub_count: total # of publications port has made during its lifetime
65 * @probing_state:
66 * @probing_interval:
67 * @timer_ref:
68 * @subscription: "node down" subscription used to terminate failed connections
69 */
70struct tipc_port {
71 spinlock_t *lock;
72 int connected;
73 u32 conn_type;
74 u32 conn_instance;
75 int published;
76 u32 max_pkt;
77 u32 ref;
78 struct tipc_msg phdr;
79 struct list_head port_list;
80 struct list_head wait_list;
81 u32 waiting_pkts;
82 struct list_head publications;
83 u32 pub_count;
84 u32 probing_state;
85 u32 probing_interval;
86 struct timer_list timer;
87 struct tipc_node_subscr subscription;
88};
89
90extern spinlock_t tipc_port_list_lock;
91struct tipc_port_list;
92
93/*
94 * TIPC port manipulation routines
95 */
96u32 tipc_port_init(struct tipc_port *p_ptr,
97 const unsigned int importance);
98
99void tipc_acknowledge(u32 port_ref, u32 ack);
100
101void tipc_port_destroy(struct tipc_port *p_ptr);
102
103int tipc_publish(struct tipc_port *p_ptr, unsigned int scope,
104 struct tipc_name_seq const *name_seq);
105
106int tipc_withdraw(struct tipc_port *p_ptr, unsigned int scope,
107 struct tipc_name_seq const *name_seq);
108
109int tipc_port_connect(u32 portref, struct tipc_portid const *port);
110
111int tipc_port_disconnect(u32 portref);
112
113int tipc_port_shutdown(u32 ref);
114
115/*
116 * The following routines require that the port be locked on entry
117 */
118int __tipc_port_disconnect(struct tipc_port *tp_ptr);
119int __tipc_port_connect(u32 ref, struct tipc_port *p_ptr,
120 struct tipc_portid const *peer);
121int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg);
122
123struct sk_buff *tipc_port_get_ports(void);
124void tipc_port_reinit(void);
125
126/**
127 * tipc_port_lock - lock port instance referred to and return its pointer
128 */
129static inline struct tipc_port *tipc_port_lock(u32 ref)
130{
131 return (struct tipc_port *)tipc_ref_lock(ref);
132}
133
134/**
135 * tipc_port_unlock - unlock a port instance
136 *
137 * Can use pointer instead of tipc_ref_unlock() since port is already locked.
138 */
139static inline void tipc_port_unlock(struct tipc_port *p_ptr)
140{
141 spin_unlock_bh(p_ptr->lock);
142}
143
144static inline u32 tipc_port_peernode(struct tipc_port *p_ptr)
145{
146 return msg_destnode(&p_ptr->phdr);
147}
148
149static inline u32 tipc_port_peerport(struct tipc_port *p_ptr)
150{
151 return msg_destport(&p_ptr->phdr);
152}
153
154static inline bool tipc_port_unreliable(struct tipc_port *port)
155{
156 return msg_src_droppable(&port->phdr) != 0;
157}
158
159static inline void tipc_port_set_unreliable(struct tipc_port *port,
160 bool unreliable)
161{
162 msg_set_src_droppable(&port->phdr, unreliable ? 1 : 0);
163}
164
165static inline bool tipc_port_unreturnable(struct tipc_port *port)
166{
167 return msg_dest_droppable(&port->phdr) != 0;
168}
169
170static inline void tipc_port_set_unreturnable(struct tipc_port *port,
171 bool unreturnable)
172{
173 msg_set_dest_droppable(&port->phdr, unreturnable ? 1 : 0);
174}
175
176
177static inline int tipc_port_importance(struct tipc_port *port)
178{
179 return msg_importance(&port->phdr);
180}
181
182static inline int tipc_port_set_importance(struct tipc_port *port, int imp)
183{
184 if (imp > TIPC_CRITICAL_IMPORTANCE)
185 return -EINVAL;
186 msg_set_importance(&port->phdr, (u32)imp);
187 return 0;
188}
189
190#endif
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