net/tipc/port.h

   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  */
  70 struct 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
  90 extern spinlock_t tipc_port_list_lock;
  91 struct tipc_port_list;
  92
  93 /*
  94  * TIPC port manipulation routines
  95  */
  96 u32 tipc_port_init(struct tipc_port *p_ptr,
  97                    const unsigned int importance);
  98
  99 void tipc_acknowledge(u32 port_ref, u32 ack);
 100
 101 void tipc_port_destroy(struct tipc_port *p_ptr);
 102
 103 int tipc_publish(struct tipc_port *p_ptr, unsigned int scope,
 104                  struct tipc_name_seq const *name_seq);
 105
 106 int tipc_withdraw(struct tipc_port *p_ptr, unsigned int scope,
 107                   struct tipc_name_seq const *name_seq);
 108
 109 int tipc_port_connect(u32 portref, struct tipc_portid const *port);
 110
 111 int tipc_port_disconnect(u32 portref);
 112
 113 int tipc_port_shutdown(u32 ref);
 114
 115 /*
 116  * The following routines require that the port be locked on entry
 117  */
 118 int __tipc_port_disconnect(struct tipc_port *tp_ptr);
 119 int __tipc_port_connect(u32 ref, struct tipc_port *p_ptr,
 120                    struct tipc_portid const *peer);
 121 int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg);
 122
 123 struct sk_buff *tipc_port_get_ports(void);
 124 void tipc_port_reinit(void);
 125
 126 /**
 127  * tipc_port_lock - lock port instance referred to and return its pointer
 128  */
 129 static 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  */
 139 static inline void tipc_port_unlock(struct tipc_port *p_ptr)
 140 {
 141         spin_unlock_bh(p_ptr->lock);
 142 }
 143
 144 static inline u32 tipc_port_peernode(struct tipc_port *p_ptr)
 145 {
 146         return msg_destnode(&p_ptr->phdr);
 147 }
 148
 149 static inline u32 tipc_port_peerport(struct tipc_port *p_ptr)
 150 {
 151         return msg_destport(&p_ptr->phdr);
 152 }
 153
 154 static inline  bool tipc_port_unreliable(struct tipc_port *port)
 155 {
 156         return msg_src_droppable(&port->phdr) != 0;
 157 }
 158
 159 static 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
 165 static inline bool tipc_port_unreturnable(struct tipc_port *port)
 166 {
 167         return msg_dest_droppable(&port->phdr) != 0;
 168 }
 169
 170 static 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
 177 static inline int tipc_port_importance(struct tipc_port *port)
 178 {
 179         return msg_importance(&port->phdr);
 180 }
 181
 182 static 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 }
 188
 189 #endif