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namespace.pl

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  • port.h 6.68 KiB
    /*
     * net/tipc/port.h: Include file for TIPC port code
     *
     * Copyright (c) 1994-2007, 2014, Ericsson AB
     * Copyright (c) 2004-2007, 2010-2013, Wind River Systems
     * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions are met:
     *
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the names of the copyright holders nor the names of its
     *    contributors may be used to endorse or promote products derived from
     *    this software without specific prior written permission.
     *
     * Alternatively, this software may be distributed under the terms of the
     * GNU General Public License ("GPL") version 2 as published by the Free
     * Software Foundation.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
     * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
     * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    #ifndef _TIPC_PORT_H
    #define _TIPC_PORT_H
    
    #include "ref.h"
    #include "net.h"
    #include "msg.h"
    #include "node_subscr.h"
    
    #define TIPC_CONNACK_INTV         256
    #define TIPC_FLOWCTRL_WIN        (TIPC_CONNACK_INTV * 2)
    #define TIPC_CONN_OVERLOAD_LIMIT ((TIPC_FLOWCTRL_WIN * 2 + 1) * \
    				  SKB_TRUESIZE(TIPC_MAX_USER_MSG_SIZE))
    
    /**
     * struct tipc_port - TIPC port structure
     * @lock: pointer to spinlock for controlling access to port
     * @connected: non-zero if port is currently connected to a peer port
     * @conn_type: TIPC type used when connection was established
     * @conn_instance: TIPC instance used when connection was established
     * @conn_unacked: number of unacknowledged messages received from peer port
     * @published: non-zero if port has one or more associated names
     * @congested: non-zero if cannot send because of link or port congestion
     * @max_pkt: maximum packet size "hint" used when building messages sent by port
     * @ref: unique reference to port in TIPC object registry
     * @phdr: preformatted message header used when sending messages
     * @port_list: adjacent ports in TIPC's global list of ports
     * @wait_list: adjacent ports in list of ports waiting on link congestion
     * @waiting_pkts:
     * @sent: # of non-empty messages sent by port
     * @acked: # of non-empty message acknowledgements from connected port's peer
     * @publications: list of publications for port
     * @pub_count: total # of publications port has made during its lifetime
     * @probing_state:
     * @probing_interval:
     * @timer_ref:
     * @subscription: "node down" subscription used to terminate failed connections
     */
    struct tipc_port {
    	spinlock_t *lock;
    	int connected;
    	u32 conn_type;
    	u32 conn_instance;
    	u32 conn_unacked;
    	int published;
    	u32 congested;
    	u32 max_pkt;
    	u32 ref;
    	struct tipc_msg phdr;
    	struct list_head port_list;
    	struct list_head wait_list;
    	u32 waiting_pkts;
    	u32 sent;
    	u32 acked;
    	struct list_head publications;
    	u32 pub_count;
    	u32 probing_state;
    	u32 probing_interval;
    	struct timer_list timer;
    	struct tipc_node_subscr subscription;
    };
    
    extern spinlock_t tipc_port_list_lock;
    struct tipc_port_list;
    
    /*
     * TIPC port manipulation routines
     */
    u32 tipc_port_init(struct tipc_port *p_ptr,
    		   const unsigned int importance);
    
    void tipc_acknowledge(u32 port_ref, u32 ack);
    
    void tipc_port_destroy(struct tipc_port *p_ptr);
    
    int tipc_publish(struct tipc_port *p_ptr, unsigned int scope,
    		 struct tipc_name_seq const *name_seq);
    
    int tipc_withdraw(struct tipc_port *p_ptr, unsigned int scope,
    		  struct tipc_name_seq const *name_seq);
    
    int tipc_port_connect(u32 portref, struct tipc_portid const *port);
    
    int tipc_port_disconnect(u32 portref);
    
    int tipc_port_shutdown(u32 ref);
    
    void tipc_port_wakeup(struct tipc_port *port);
    
    /*
     * The following routines require that the port be locked on entry
     */
    int __tipc_port_disconnect(struct tipc_port *tp_ptr);
    int __tipc_port_connect(u32 ref, struct tipc_port *p_ptr,
    		   struct tipc_portid const *peer);
    int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg);
    
    /*
     * TIPC messaging routines
     */
    
    int tipc_port_mcast_xmit(struct tipc_port *port,
    			 struct tipc_name_seq const *seq,
    			 struct iovec const *msg,
    			 unsigned int len);
    
    struct sk_buff *tipc_port_get_ports(void);
    void tipc_port_proto_rcv(struct tipc_port *port, struct sk_buff *buf);
    void tipc_port_mcast_rcv(struct sk_buff *buf, struct tipc_port_list *dp);
    void tipc_port_reinit(void);
    
    /**
     * tipc_port_lock - lock port instance referred to and return its pointer
     */
    static inline struct tipc_port *tipc_port_lock(u32 ref)
    {
    	return (struct tipc_port *)tipc_ref_lock(ref);
    }
    
    /**
     * tipc_port_unlock - unlock a port instance
     *
     * Can use pointer instead of tipc_ref_unlock() since port is already locked.
     */
    static inline void tipc_port_unlock(struct tipc_port *p_ptr)
    {
    	spin_unlock_bh(p_ptr->lock);
    }
    
    static inline int tipc_port_congested(struct tipc_port *p_ptr)
    {
    	return ((p_ptr->sent - p_ptr->acked) >= TIPC_FLOWCTRL_WIN);
    }
    
    
    static inline u32 tipc_port_peernode(struct tipc_port *p_ptr)
    {
    	return msg_destnode(&p_ptr->phdr);
    }
    
    static inline u32 tipc_port_peerport(struct tipc_port *p_ptr)
    {
    	return msg_destport(&p_ptr->phdr);
    }
    
    static inline  bool tipc_port_unreliable(struct tipc_port *port)
    {
    	return msg_src_droppable(&port->phdr) != 0;
    }
    
    static inline void tipc_port_set_unreliable(struct tipc_port *port,
    					    bool unreliable)
    {
    	msg_set_src_droppable(&port->phdr, unreliable ? 1 : 0);
    }
    
    static inline bool tipc_port_unreturnable(struct tipc_port *port)
    {
    	return msg_dest_droppable(&port->phdr) != 0;
    }
    
    static inline void tipc_port_set_unreturnable(struct tipc_port *port,
    					     bool unreturnable)
    {
    	msg_set_dest_droppable(&port->phdr, unreturnable ? 1 : 0);
    }
    
    
    static inline int tipc_port_importance(struct tipc_port *port)
    {
    	return msg_importance(&port->phdr);
    }
    
    static inline void tipc_port_set_importance(struct tipc_port *port, int imp)
    {
    	msg_set_importance(&port->phdr, (u32)imp);
    }
    
    #endif