316 lines
10 KiB
C
316 lines
10 KiB
C
/*
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* net/tipc/port.h: Include file for TIPC port code
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*
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* Copyright (c) 1994-2007, Ericsson AB
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* Copyright (c) 2004-2007, 2010-2011, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _TIPC_PORT_H
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#define _TIPC_PORT_H
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#include "ref.h"
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#include "net.h"
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#include "msg.h"
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#include "node_subscr.h"
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#define TIPC_FLOW_CONTROL_WIN 512
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typedef void (*tipc_msg_err_event) (void *usr_handle, u32 portref,
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struct sk_buff **buf, unsigned char const *data,
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unsigned int size, int reason,
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struct tipc_portid const *attmpt_destid);
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typedef void (*tipc_named_msg_err_event) (void *usr_handle, u32 portref,
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struct sk_buff **buf, unsigned char const *data,
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unsigned int size, int reason,
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struct tipc_name_seq const *attmpt_dest);
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typedef void (*tipc_conn_shutdown_event) (void *usr_handle, u32 portref,
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struct sk_buff **buf, unsigned char const *data,
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unsigned int size, int reason);
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typedef void (*tipc_msg_event) (void *usr_handle, u32 portref,
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struct sk_buff **buf, unsigned char const *data,
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unsigned int size, unsigned int importance,
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struct tipc_portid const *origin);
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typedef void (*tipc_named_msg_event) (void *usr_handle, u32 portref,
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struct sk_buff **buf, unsigned char const *data,
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unsigned int size, unsigned int importance,
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struct tipc_portid const *orig,
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struct tipc_name_seq const *dest);
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typedef void (*tipc_conn_msg_event) (void *usr_handle, u32 portref,
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struct sk_buff **buf, unsigned char const *data,
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unsigned int size);
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typedef void (*tipc_continue_event) (void *usr_handle, u32 portref);
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/**
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* struct user_port - TIPC user port (used with native API)
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* @usr_handle: user-specified field
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* @ref: object reference to associated TIPC port
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* <various callback routines>
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*/
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struct user_port {
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void *usr_handle;
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u32 ref;
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tipc_msg_err_event err_cb;
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tipc_named_msg_err_event named_err_cb;
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tipc_conn_shutdown_event conn_err_cb;
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tipc_msg_event msg_cb;
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tipc_named_msg_event named_msg_cb;
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tipc_conn_msg_event conn_msg_cb;
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tipc_continue_event continue_event_cb;
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};
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/**
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* struct tipc_port - TIPC port structure
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* @usr_handle: pointer to additional user-defined information about port
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* @lock: pointer to spinlock for controlling access to port
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* @connected: non-zero if port is currently connected to a peer port
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* @conn_type: TIPC type used when connection was established
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* @conn_instance: TIPC instance used when connection was established
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* @conn_unacked: number of unacknowledged messages received from peer port
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* @published: non-zero if port has one or more associated names
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* @congested: non-zero if cannot send because of link or port congestion
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* @max_pkt: maximum packet size "hint" used when building messages sent by port
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* @ref: unique reference to port in TIPC object registry
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* @phdr: preformatted message header used when sending messages
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* @port_list: adjacent ports in TIPC's global list of ports
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* @dispatcher: ptr to routine which handles received messages
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* @wakeup: ptr to routine to call when port is no longer congested
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* @user_port: ptr to user port associated with port (if any)
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* @wait_list: adjacent ports in list of ports waiting on link congestion
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* @waiting_pkts:
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* @sent: # of non-empty messages sent by port
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* @acked: # of non-empty message acknowledgements from connected port's peer
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* @publications: list of publications for port
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* @pub_count: total # of publications port has made during its lifetime
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* @probing_state:
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* @probing_interval:
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* @timer_ref:
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* @subscription: "node down" subscription used to terminate failed connections
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*/
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struct tipc_port {
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void *usr_handle;
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spinlock_t *lock;
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int connected;
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u32 conn_type;
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u32 conn_instance;
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u32 conn_unacked;
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int published;
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u32 congested;
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u32 max_pkt;
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u32 ref;
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struct tipc_msg phdr;
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struct list_head port_list;
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u32 (*dispatcher)(struct tipc_port *, struct sk_buff *);
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void (*wakeup)(struct tipc_port *);
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struct user_port *user_port;
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struct list_head wait_list;
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u32 waiting_pkts;
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u32 sent;
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u32 acked;
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struct list_head publications;
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u32 pub_count;
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u32 probing_state;
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u32 probing_interval;
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struct timer_list timer;
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struct tipc_node_subscr subscription;
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};
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extern spinlock_t tipc_port_list_lock;
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struct port_list;
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/*
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* TIPC port manipulation routines
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*/
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struct tipc_port *tipc_createport_raw(void *usr_handle,
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u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
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void (*wakeup)(struct tipc_port *), const u32 importance);
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int tipc_reject_msg(struct sk_buff *buf, u32 err);
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int tipc_send_buf_fast(struct sk_buff *buf, u32 destnode);
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void tipc_acknowledge(u32 port_ref, u32 ack);
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int tipc_createport(void *usr_handle,
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unsigned int importance, tipc_msg_err_event error_cb,
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tipc_named_msg_err_event named_error_cb,
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tipc_conn_shutdown_event conn_error_cb, tipc_msg_event msg_cb,
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tipc_named_msg_event named_msg_cb,
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tipc_conn_msg_event conn_msg_cb,
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tipc_continue_event continue_event_cb, u32 *portref);
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int tipc_deleteport(u32 portref);
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int tipc_portimportance(u32 portref, unsigned int *importance);
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int tipc_set_portimportance(u32 portref, unsigned int importance);
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int tipc_portunreliable(u32 portref, unsigned int *isunreliable);
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int tipc_set_portunreliable(u32 portref, unsigned int isunreliable);
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int tipc_portunreturnable(u32 portref, unsigned int *isunreturnable);
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int tipc_set_portunreturnable(u32 portref, unsigned int isunreturnable);
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int tipc_publish(u32 portref, unsigned int scope,
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struct tipc_name_seq const *name_seq);
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int tipc_withdraw(u32 portref, unsigned int scope,
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struct tipc_name_seq const *name_seq);
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int tipc_connect2port(u32 portref, struct tipc_portid const *port);
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int tipc_disconnect(u32 portref);
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int tipc_shutdown(u32 ref);
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/*
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* The following routines require that the port be locked on entry
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*/
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int tipc_disconnect_port(struct tipc_port *tp_ptr);
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/*
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* TIPC messaging routines
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*/
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int tipc_send(u32 portref, unsigned int num_sect, struct iovec const *msg_sect,
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unsigned int total_len);
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int tipc_send2name(u32 portref, struct tipc_name const *name, u32 domain,
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unsigned int num_sect, struct iovec const *msg_sect,
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unsigned int total_len);
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int tipc_send2port(u32 portref, struct tipc_portid const *dest,
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unsigned int num_sect, struct iovec const *msg_sect,
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unsigned int total_len);
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int tipc_send_buf2port(u32 portref, struct tipc_portid const *dest,
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struct sk_buff *buf, unsigned int dsz);
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int tipc_multicast(u32 portref, struct tipc_name_seq const *seq,
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unsigned int section_count, struct iovec const *msg,
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unsigned int total_len);
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int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
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struct iovec const *msg_sect, u32 num_sect,
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unsigned int total_len, int err);
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struct sk_buff *tipc_port_get_ports(void);
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void tipc_port_recv_proto_msg(struct sk_buff *buf);
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void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp);
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void tipc_port_reinit(void);
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/**
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* tipc_port_lock - lock port instance referred to and return its pointer
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*/
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static inline struct tipc_port *tipc_port_lock(u32 ref)
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{
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return (struct tipc_port *)tipc_ref_lock(ref);
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}
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/**
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* tipc_port_unlock - unlock a port instance
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*
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* Can use pointer instead of tipc_ref_unlock() since port is already locked.
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*/
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static inline void tipc_port_unlock(struct tipc_port *p_ptr)
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{
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spin_unlock_bh(p_ptr->lock);
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}
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static inline struct tipc_port *tipc_port_deref(u32 ref)
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{
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return (struct tipc_port *)tipc_ref_deref(ref);
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}
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static inline u32 tipc_peer_port(struct tipc_port *p_ptr)
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{
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return msg_destport(&p_ptr->phdr);
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}
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static inline u32 tipc_peer_node(struct tipc_port *p_ptr)
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{
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return msg_destnode(&p_ptr->phdr);
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}
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static inline int tipc_port_congested(struct tipc_port *p_ptr)
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{
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return (p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2);
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}
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/**
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* tipc_port_recv_msg - receive message from lower layer and deliver to port user
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*/
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static inline int tipc_port_recv_msg(struct sk_buff *buf)
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{
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struct tipc_port *p_ptr;
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struct tipc_msg *msg = buf_msg(buf);
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u32 destport = msg_destport(msg);
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u32 dsz = msg_data_sz(msg);
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u32 err;
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/* forward unresolved named message */
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if (unlikely(!destport)) {
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tipc_net_route_msg(buf);
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return dsz;
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}
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/* validate destination & pass to port, otherwise reject message */
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p_ptr = tipc_port_lock(destport);
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if (likely(p_ptr)) {
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if (likely(p_ptr->connected)) {
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if ((unlikely(msg_origport(msg) != tipc_peer_port(p_ptr))) ||
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(unlikely(msg_orignode(msg) != tipc_peer_node(p_ptr))) ||
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(unlikely(!msg_connected(msg)))) {
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err = TIPC_ERR_NO_PORT;
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tipc_port_unlock(p_ptr);
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goto reject;
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}
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}
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err = p_ptr->dispatcher(p_ptr, buf);
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tipc_port_unlock(p_ptr);
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if (likely(!err))
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return dsz;
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} else {
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err = TIPC_ERR_NO_PORT;
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}
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reject:
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return tipc_reject_msg(buf, err);
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}
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#endif
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