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, 2010-2011, 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 #define CONN_OVERLOAD_LIMIT     ((TIPC_FLOW_CONTROL_WIN * 2 + 1) * \
  47                                 SKB_TRUESIZE(TIPC_MAX_USER_MSG_SIZE))
  48
  49 typedef void (*tipc_msg_err_event) (void *usr_handle, u32 portref,
  50                 struct sk_buff **buf, unsigned char const *data,
  51                 unsigned int size, int reason,
  52                 struct tipc_portid const *attmpt_destid);
  53
  54 typedef void (*tipc_named_msg_err_event) (void *usr_handle, u32 portref,
  55                 struct sk_buff **buf, unsigned char const *data,
  56                 unsigned int size, int reason,
  57                 struct tipc_name_seq const *attmpt_dest);
  58
  59 typedef void (*tipc_conn_shutdown_event) (void *usr_handle, u32 portref,
  60                 struct sk_buff **buf, unsigned char const *data,
  61                 unsigned int size, int reason);
  62
  63 typedef void (*tipc_msg_event) (void *usr_handle, u32 portref,
  64                 struct sk_buff **buf, unsigned char const *data,
  65                 unsigned int size, unsigned int importance,
  66                 struct tipc_portid const *origin);
  67
  68 typedef void (*tipc_named_msg_event) (void *usr_handle, u32 portref,
  69                 struct sk_buff **buf, unsigned char const *data,
  70                 unsigned int size, unsigned int importance,
  71                 struct tipc_portid const *orig,
  72                 struct tipc_name_seq const *dest);
  73
  74 typedef void (*tipc_conn_msg_event) (void *usr_handle, u32 portref,
  75                 struct sk_buff **buf, unsigned char const *data,
  76                 unsigned int size);
  77
  78 typedef void (*tipc_continue_event) (void *usr_handle, u32 portref);
  79
  80 /**
  81  * struct user_port - TIPC user port (used with native API)
  82  * @usr_handle: user-specified field
  83  * @ref: object reference to associated TIPC port
  84  *
  85  * <various callback routines>
  86  */
  87 struct user_port {
  88         void *usr_handle;
  89         u32 ref;
  90         tipc_msg_err_event err_cb;
  91         tipc_named_msg_err_event named_err_cb;
  92         tipc_conn_shutdown_event conn_err_cb;
  93         tipc_msg_event msg_cb;
  94         tipc_named_msg_event named_msg_cb;
  95         tipc_conn_msg_event conn_msg_cb;
  96         tipc_continue_event continue_event_cb;
  97 };
  98
  99 /**
 100  * struct tipc_port - TIPC port structure
 101  * @usr_handle: pointer to additional user-defined information about port
 102  * @lock: pointer to spinlock for controlling access to port
 103  * @connected: non-zero if port is currently connected to a peer port
 104  * @conn_type: TIPC type used when connection was established
 105  * @conn_instance: TIPC instance used when connection was established
 106  * @conn_unacked: number of unacknowledged messages received from peer port
 107  * @published: non-zero if port has one or more associated names
 108  * @congested: non-zero if cannot send because of link or port congestion
 109  * @max_pkt: maximum packet size "hint" used when building messages sent by port
 110  * @ref: unique reference to port in TIPC object registry
 111  * @phdr: preformatted message header used when sending messages
 112  * @port_list: adjacent ports in TIPC's global list of ports
 113  * @dispatcher: ptr to routine which handles received messages
 114  * @wakeup: ptr to routine to call when port is no longer congested
 115  * @user_port: ptr to user port associated with port (if any)
 116  * @wait_list: adjacent ports in list of ports waiting on link congestion
 117  * @waiting_pkts:
 118  * @sent: # of non-empty messages sent by port
 119  * @acked: # of non-empty message acknowledgements from connected port's peer
 120  * @publications: list of publications for port
 121  * @pub_count: total # of publications port has made during its lifetime
 122  * @probing_state:
 123  * @probing_interval:
 124  * @timer_ref:
 125  * @subscription: "node down" subscription used to terminate failed connections
 126  */
 127 struct tipc_port {
 128         void *usr_handle;
 129         spinlock_t *lock;
 130         int connected;
 131         u32 conn_type;
 132         u32 conn_instance;
 133         u32 conn_unacked;
 134         int published;
 135         u32 congested;
 136         u32 max_pkt;
 137         u32 ref;
 138         struct tipc_msg phdr;
 139         struct list_head port_list;
 140         u32 (*dispatcher)(struct tipc_port *, struct sk_buff *);
 141         void (*wakeup)(struct tipc_port *);
 142         struct user_port *user_port;
 143         struct list_head wait_list;
 144         u32 waiting_pkts;
 145         u32 sent;
 146         u32 acked;
 147         struct list_head publications;
 148         u32 pub_count;
 149         u32 probing_state;
 150         u32 probing_interval;
 151         struct timer_list timer;
 152         struct tipc_node_subscr subscription;
 153 };
 154
 155 extern spinlock_t tipc_port_list_lock;
 156 struct tipc_port_list;
 157
 158 /*
 159  * TIPC port manipulation routines
 160  */
 161 struct tipc_port *tipc_createport_raw(void *usr_handle,
 162                 u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
 163                 void (*wakeup)(struct tipc_port *), const u32 importance);
 164
 165 int tipc_reject_msg(struct sk_buff *buf, u32 err);
 166
 167 int tipc_send_buf_fast(struct sk_buff *buf, u32 destnode);
 168
 169 void tipc_acknowledge(u32 port_ref, u32 ack);
 170
 171 int tipc_createport(void *usr_handle,
 172                 unsigned int importance, tipc_msg_err_event error_cb,
 173                 tipc_named_msg_err_event named_error_cb,
 174                 tipc_conn_shutdown_event conn_error_cb, tipc_msg_event msg_cb,
 175                 tipc_named_msg_event named_msg_cb,
 176                 tipc_conn_msg_event conn_msg_cb,
 177                 tipc_continue_event continue_event_cb, u32 *portref);
 178
 179 int tipc_deleteport(u32 portref);
 180
 181 int tipc_portimportance(u32 portref, unsigned int *importance);
 182 int tipc_set_portimportance(u32 portref, unsigned int importance);
 183
 184 int tipc_portunreliable(u32 portref, unsigned int *isunreliable);
 185 int tipc_set_portunreliable(u32 portref, unsigned int isunreliable);
 186
 187 int tipc_portunreturnable(u32 portref, unsigned int *isunreturnable);
 188 int tipc_set_portunreturnable(u32 portref, unsigned int isunreturnable);
 189
 190 int tipc_publish(u32 portref, unsigned int scope,
 191                 struct tipc_name_seq const *name_seq);
 192 int tipc_withdraw(u32 portref, unsigned int scope,
 193                 struct tipc_name_seq const *name_seq);
 194
 195 int tipc_connect(u32 portref, struct tipc_portid const *port);
 196
 197 int tipc_disconnect(u32 portref);
 198
 199 int tipc_shutdown(u32 ref);
 200
 201
 202 /*
 203  * The following routines require that the port be locked on entry
 204  */
 205 int __tipc_disconnect(struct tipc_port *tp_ptr);
 206 int __tipc_connect(u32 ref, struct tipc_port *p_ptr,
 207                    struct tipc_portid const *peer);
 208 int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg);
 209
 210 /*
 211  * TIPC messaging routines
 212  */
 213 int tipc_port_recv_msg(struct sk_buff *buf);
 214 int tipc_send(u32 portref, unsigned int num_sect, struct iovec const *msg_sect,
 215               unsigned int total_len);
 216
 217 int tipc_send2name(u32 portref, struct tipc_name const *name, u32 domain,
 218                    unsigned int num_sect, struct iovec const *msg_sect,
 219                    unsigned int total_len);
 220
 221 int tipc_send2port(u32 portref, struct tipc_portid const *dest,
 222                    unsigned int num_sect, struct iovec const *msg_sect,
 223                    unsigned int total_len);
 224
 225 int tipc_send_buf2port(u32 portref, struct tipc_portid const *dest,
 226                 struct sk_buff *buf, unsigned int dsz);
 227
 228 int tipc_multicast(u32 portref, struct tipc_name_seq const *seq,
 229                    unsigned int section_count, struct iovec const *msg,
 230                    unsigned int total_len);
 231
 232 int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
 233                               struct iovec const *msg_sect, u32 num_sect,
 234                               unsigned int total_len, int err);
 235 struct sk_buff *tipc_port_get_ports(void);
 236 void tipc_port_recv_proto_msg(struct sk_buff *buf);
 237 void tipc_port_recv_mcast(struct sk_buff *buf, struct tipc_port_list *dp);
 238 void tipc_port_reinit(void);
 239
 240 /**
 241  * tipc_port_lock - lock port instance referred to and return its pointer
 242  */
 243 static inline struct tipc_port *tipc_port_lock(u32 ref)
 244 {
 245         return (struct tipc_port *)tipc_ref_lock(ref);
 246 }
 247
 248 /**
 249  * tipc_port_unlock - unlock a port instance
 250  *
 251  * Can use pointer instead of tipc_ref_unlock() since port is already locked.
 252  */
 253 static inline void tipc_port_unlock(struct tipc_port *p_ptr)
 254 {
 255         spin_unlock_bh(p_ptr->lock);
 256 }
 257
 258 static inline struct tipc_port *tipc_port_deref(u32 ref)
 259 {
 260         return (struct tipc_port *)tipc_ref_deref(ref);
 261 }
 262
 263 static inline int tipc_port_congested(struct tipc_port *p_ptr)
 264 {
 265         return (p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2);
 266 }
 267
 268 #endif