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
  47 typedef 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
  52 typedef 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
  57 typedef 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
  61 typedef 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
  66 typedef 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
  72 typedef void (*tipc_conn_msg_event) (void *usr_handle, u32 portref,
  73                 struct sk_buff **buf, unsigned char const *data,
  74                 unsigned int size);
  75
  76 typedef 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  * <various callback routines>
  83  */
  84
  85 struct 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  */
 125 struct 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
 153 extern spinlock_t tipc_port_list_lock;
 154 struct port_list;
 155
 156 /*
 157  * TIPC port manipulation routines
 158  */
 159 struct 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
 163 int tipc_reject_msg(struct sk_buff *buf, u32 err);
 164
 165 int tipc_send_buf_fast(struct sk_buff *buf, u32 destnode);
 166
 167 void tipc_acknowledge(u32 port_ref, u32 ack);
 168
 169 int 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
 177 int tipc_deleteport(u32 portref);
 178
 179 int tipc_portimportance(u32 portref, unsigned int *importance);
 180 int tipc_set_portimportance(u32 portref, unsigned int importance);
 181
 182 int tipc_portunreliable(u32 portref, unsigned int *isunreliable);
 183 int tipc_set_portunreliable(u32 portref, unsigned int isunreliable);
 184
 185 int tipc_portunreturnable(u32 portref, unsigned int *isunreturnable);
 186 int tipc_set_portunreturnable(u32 portref, unsigned int isunreturnable);
 187
 188 int tipc_publish(u32 portref, unsigned int scope,
 189                 struct tipc_name_seq const *name_seq);
 190 int tipc_withdraw(u32 portref, unsigned int scope,
 191                 struct tipc_name_seq const *name_seq);
 192
 193 int tipc_connect2port(u32 portref, struct tipc_portid const *port);
 194
 195 int tipc_disconnect(u32 portref);
 196
 197 int tipc_shutdown(u32 ref);
 198
 199
 200 /*
 201  * The following routines require that the port be locked on entry
 202  */
 203 int tipc_disconnect_port(struct tipc_port *tp_ptr);
 204
 205 /*
 206  * TIPC messaging routines
 207  */
 208 int tipc_send(u32 portref, unsigned int num_sect, struct iovec const *msg_sect,
 209               unsigned int total_len);
 210
 211 int tipc_send2name(u32 portref, struct tipc_name const *name, u32 domain,
 212                    unsigned int num_sect, struct iovec const *msg_sect,
 213                    unsigned int total_len);
 214
 215 int tipc_send2port(u32 portref, struct tipc_portid const *dest,
 216                    unsigned int num_sect, struct iovec const *msg_sect,
 217                    unsigned int total_len);
 218
 219 int tipc_send_buf2port(u32 portref, struct tipc_portid const *dest,
 220                 struct sk_buff *buf, unsigned int dsz);
 221
 222 int tipc_multicast(u32 portref, struct tipc_name_seq const *seq,
 223                    unsigned int section_count, struct iovec const *msg,
 224                    unsigned int total_len);
 225
 226 int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
 227                               struct iovec const *msg_sect, u32 num_sect,
 228                               unsigned int total_len, int err);
 229 struct sk_buff *tipc_port_get_ports(void);
 230 void tipc_port_recv_proto_msg(struct sk_buff *buf);
 231 void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp);
 232 void tipc_port_reinit(void);
 233
 234 /**
 235  * tipc_port_lock - lock port instance referred to and return its pointer
 236  */
 237
 238 static inline struct tipc_port *tipc_port_lock(u32 ref)
 239 {
 240         return (struct tipc_port *)tipc_ref_lock(ref);
 241 }
 242
 243 /**
 244  * tipc_port_unlock - unlock a port instance
 245  *
 246  * Can use pointer instead of tipc_ref_unlock() since port is already locked.
 247  */
 248
 249 static inline void tipc_port_unlock(struct tipc_port *p_ptr)
 250 {
 251         spin_unlock_bh(p_ptr->lock);
 252 }
 253
 254 static inline struct tipc_port *tipc_port_deref(u32 ref)
 255 {
 256         return (struct tipc_port *)tipc_ref_deref(ref);
 257 }
 258
 259 static inline u32 tipc_peer_port(struct tipc_port *p_ptr)
 260 {
 261         return msg_destport(&p_ptr->phdr);
 262 }
 263
 264 static inline u32 tipc_peer_node(struct tipc_port *p_ptr)
 265 {
 266         return msg_destnode(&p_ptr->phdr);
 267 }
 268
 269 static inline int tipc_port_congested(struct tipc_port *p_ptr)
 270 {
 271         return (p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2);
 272 }
 273
 274 /**
 275  * tipc_port_recv_msg - receive message from lower layer and deliver to port user
 276  */
 277
 278 static inline int tipc_port_recv_msg(struct sk_buff *buf)
 279 {
 280         struct tipc_port *p_ptr;
 281         struct tipc_msg *msg = buf_msg(buf);
 282         u32 destport = msg_destport(msg);
 283         u32 dsz = msg_data_sz(msg);
 284         u32 err;
 285
 286         /* forward unresolved named message */
 287         if (unlikely(!destport)) {
 288                 tipc_net_route_msg(buf);
 289                 return dsz;
 290         }
 291
 292         /* validate destination & pass to port, otherwise reject message */
 293         p_ptr = tipc_port_lock(destport);
 294         if (likely(p_ptr)) {
 295                 if (likely(p_ptr->connected)) {
 296                         if ((unlikely(msg_origport(msg) != tipc_peer_port(p_ptr))) ||
 297                             (unlikely(msg_orignode(msg) != tipc_peer_node(p_ptr))) ||
 298                             (unlikely(!msg_connected(msg)))) {
 299                                 err = TIPC_ERR_NO_PORT;
 300                                 tipc_port_unlock(p_ptr);
 301                                 goto reject;
 302                         }
 303                 }
 304                 err = p_ptr->dispatcher(p_ptr, buf);
 305                 tipc_port_unlock(p_ptr);
 306                 if (likely(!err))
 307                         return dsz;
 308         } else {
 309                 err = TIPC_ERR_NO_PORT;
 310         }
 311 reject:
 312         return tipc_reject_msg(buf, err);
 313 }
 314
 315 #endif