linux/net/tipc/port.h
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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
  47typedef 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
  52typedef 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
  57typedef 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
  61typedef 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
  66typedef 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
  72typedef void (*tipc_conn_msg_event) (void *usr_handle, u32 portref,
  73                struct sk_buff **buf, unsigned char const *data,
  74                unsigned int size);
  75
  76typedef 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 *
  83 * <various callback routines>
  84 */
  85struct 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 */
 125struct 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
 153extern spinlock_t tipc_port_list_lock;
 154struct tipc_port_list;
 155
 156/*
 157 * TIPC port manipulation routines
 158 */
 159struct 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
 163int tipc_reject_msg(struct sk_buff *buf, u32 err);
 164
 165int tipc_send_buf_fast(struct sk_buff *buf, u32 destnode);
 166
 167void tipc_acknowledge(u32 port_ref, u32 ack);
 168
 169int 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
 177int tipc_deleteport(u32 portref);
 178
 179int tipc_portimportance(u32 portref, unsigned int *importance);
 180int tipc_set_portimportance(u32 portref, unsigned int importance);
 181
 182int tipc_portunreliable(u32 portref, unsigned int *isunreliable);
 183int tipc_set_portunreliable(u32 portref, unsigned int isunreliable);
 184
 185int tipc_portunreturnable(u32 portref, unsigned int *isunreturnable);
 186int tipc_set_portunreturnable(u32 portref, unsigned int isunreturnable);
 187
 188int tipc_publish(u32 portref, unsigned int scope,
 189                struct tipc_name_seq const *name_seq);
 190int tipc_withdraw(u32 portref, unsigned int scope,
 191                struct tipc_name_seq const *name_seq);
 192
 193int tipc_connect2port(u32 portref, struct tipc_portid const *port);
 194
 195int tipc_disconnect(u32 portref);
 196
 197int tipc_shutdown(u32 ref);
 198
 199
 200/*
 201 * The following routines require that the port be locked on entry
 202 */
 203int tipc_disconnect_port(struct tipc_port *tp_ptr);
 204int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg);
 205
 206/*
 207 * TIPC messaging routines
 208 */
 209int tipc_port_recv_msg(struct sk_buff *buf);
 210int tipc_send(u32 portref, unsigned int num_sect, struct iovec const *msg_sect,
 211              unsigned int total_len);
 212
 213int tipc_send2name(u32 portref, struct tipc_name const *name, u32 domain,
 214                   unsigned int num_sect, struct iovec const *msg_sect,
 215                   unsigned int total_len);
 216
 217int tipc_send2port(u32 portref, struct tipc_portid const *dest,
 218                   unsigned int num_sect, struct iovec const *msg_sect,
 219                   unsigned int total_len);
 220
 221int tipc_send_buf2port(u32 portref, struct tipc_portid const *dest,
 222                struct sk_buff *buf, unsigned int dsz);
 223
 224int tipc_multicast(u32 portref, struct tipc_name_seq const *seq,
 225                   unsigned int section_count, struct iovec const *msg,
 226                   unsigned int total_len);
 227
 228int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
 229                              struct iovec const *msg_sect, u32 num_sect,
 230                              unsigned int total_len, int err);
 231struct sk_buff *tipc_port_get_ports(void);
 232void tipc_port_recv_proto_msg(struct sk_buff *buf);
 233void tipc_port_recv_mcast(struct sk_buff *buf, struct tipc_port_list *dp);
 234void tipc_port_reinit(void);
 235
 236/**
 237 * tipc_port_lock - lock port instance referred to and return its pointer
 238 */
 239static 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 */
 249static inline void tipc_port_unlock(struct tipc_port *p_ptr)
 250{
 251        spin_unlock_bh(p_ptr->lock);
 252}
 253
 254static inline struct tipc_port *tipc_port_deref(u32 ref)
 255{
 256        return (struct tipc_port *)tipc_ref_deref(ref);
 257}
 258
 259static inline int tipc_port_congested(struct tipc_port *p_ptr)
 260{
 261        return (p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2);
 262}
 263
 264#endif
 265
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