net/tipc/port.h

   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, 2010-2013, 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_FLOW_CONTROL_WIN 512
  46 #define CONN_OVERLOAD_LIMIT     ((TIPC_FLOW_CONTROL_WIN * 2 + 1) * \
  47                                 SKB_TRUESIZE(TIPC_MAX_USER_MSG_SIZE))
  48
  49 /**
  50  * struct tipc_port - TIPC port structure
  51  * @sk: pointer to socket handle
  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  * @conn_unacked: number of unacknowledged messages received from peer port
  57  * @published: non-zero if port has one or more associated names
  58  * @congested: non-zero if cannot send because of link or port congestion
  59  * @max_pkt: maximum packet size "hint" used when building messages sent by port
  60  * @ref: unique reference to port in TIPC object registry
  61  * @phdr: preformatted message header used when sending messages
  62  * @port_list: adjacent ports in TIPC's global list of ports
  63  * @dispatcher: ptr to routine which handles received messages
  64  * @wakeup: ptr to routine to call when port is no longer congested
  65  * @wait_list: adjacent ports in list of ports waiting on link congestion
  66  * @waiting_pkts:
  67  * @sent: # of non-empty messages sent by port
  68  * @acked: # of non-empty message acknowledgements from connected port's peer
  69  * @publications: list of publications for port
  70  * @pub_count: total # of publications port has made during its lifetime
  71  * @probing_state:
  72  * @probing_interval:
  73  * @timer_ref:
  74  * @subscription: "node down" subscription used to terminate failed connections
  75  */
  76 struct tipc_port {
  77         struct sock *sk;
  78         spinlock_t *lock;
  79         int connected;
  80         u32 conn_type;
  81         u32 conn_instance;
  82         u32 conn_unacked;
  83         int published;
  84         u32 congested;
  85         u32 max_pkt;
  86         u32 ref;
  87         struct tipc_msg phdr;
  88         struct list_head port_list;
  89         u32 (*dispatcher)(struct tipc_port *, struct sk_buff *);
  90         void (*wakeup)(struct tipc_port *);
  91         struct list_head wait_list;
  92         u32 waiting_pkts;
  93         u32 sent;
  94         u32 acked;
  95         struct list_head publications;
  96         u32 pub_count;
  97         u32 probing_state;
  98         u32 probing_interval;
  99         struct timer_list timer;
 100         struct tipc_node_subscr subscription;
 101 };
 102
 103 extern spinlock_t tipc_port_list_lock;
 104 struct tipc_port_list;
 105
 106 /*
 107  * TIPC port manipulation routines
 108  */
 109 struct tipc_port *tipc_createport(struct sock *sk,
 110                                   u32 (*dispatcher)(struct tipc_port *,
 111                                   struct sk_buff *),
 112                                   void (*wakeup)(struct tipc_port *),
 113                                   const u32 importance);
 114
 115 int tipc_reject_msg(struct sk_buff *buf, u32 err);
 116
 117 void tipc_acknowledge(u32 port_ref, u32 ack);
 118
 119 int tipc_deleteport(u32 portref);
 120
 121 int tipc_portimportance(u32 portref, unsigned int *importance);
 122 int tipc_set_portimportance(u32 portref, unsigned int importance);
 123
 124 int tipc_portunreliable(u32 portref, unsigned int *isunreliable);
 125 int tipc_set_portunreliable(u32 portref, unsigned int isunreliable);
 126
 127 int tipc_portunreturnable(u32 portref, unsigned int *isunreturnable);
 128 int tipc_set_portunreturnable(u32 portref, unsigned int isunreturnable);
 129
 130 int tipc_publish(u32 portref, unsigned int scope,
 131                  struct tipc_name_seq const *name_seq);
 132 int tipc_withdraw(u32 portref, unsigned int scope,
 133                   struct tipc_name_seq const *name_seq);
 134
 135 int tipc_connect(u32 portref, struct tipc_portid const *port);
 136
 137 int tipc_disconnect(u32 portref);
 138
 139 int tipc_shutdown(u32 ref);
 140
 141
 142 /*
 143  * The following routines require that the port be locked on entry
 144  */
 145 int __tipc_disconnect(struct tipc_port *tp_ptr);
 146 int __tipc_connect(u32 ref, struct tipc_port *p_ptr,
 147                    struct tipc_portid const *peer);
 148 int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg);
 149
 150 /*
 151  * TIPC messaging routines
 152  */
 153 int tipc_port_recv_msg(struct sk_buff *buf);
 154 int tipc_send(u32 portref, unsigned int num_sect, struct iovec const *msg_sect,
 155               unsigned int total_len);
 156
 157 int tipc_send2name(u32 portref, struct tipc_name const *name, u32 domain,
 158                    unsigned int num_sect, struct iovec const *msg_sect,
 159                    unsigned int total_len);
 160
 161 int tipc_send2port(u32 portref, struct tipc_portid const *dest,
 162                    unsigned int num_sect, struct iovec const *msg_sect,
 163                    unsigned int total_len);
 164
 165 int tipc_multicast(u32 portref, struct tipc_name_seq const *seq,
 166                    unsigned int section_count, struct iovec const *msg,
 167                    unsigned int total_len);
 168
 169 int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
 170                               struct iovec const *msg_sect, u32 num_sect,
 171                               unsigned int total_len, int err);
 172 struct sk_buff *tipc_port_get_ports(void);
 173 void tipc_port_recv_proto_msg(struct sk_buff *buf);
 174 void tipc_port_recv_mcast(struct sk_buff *buf, struct tipc_port_list *dp);
 175 void tipc_port_reinit(void);
 176
 177 /**
 178  * tipc_port_lock - lock port instance referred to and return its pointer
 179  */
 180 static inline struct tipc_port *tipc_port_lock(u32 ref)
 181 {
 182         return (struct tipc_port *)tipc_ref_lock(ref);
 183 }
 184
 185 /**
 186  * tipc_port_unlock - unlock a port instance
 187  *
 188  * Can use pointer instead of tipc_ref_unlock() since port is already locked.
 189  */
 190 static inline void tipc_port_unlock(struct tipc_port *p_ptr)
 191 {
 192         spin_unlock_bh(p_ptr->lock);
 193 }
 194
 195 static inline struct tipc_port *tipc_port_deref(u32 ref)
 196 {
 197         return (struct tipc_port *)tipc_ref_deref(ref);
 198 }
 199
 200 static inline int tipc_port_congested(struct tipc_port *p_ptr)
 201 {
 202         return (p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2);
 203 }
 204
 205 #endif