net/tipc/port.h - kernel/msm - Gitiles

 /*
  * net/tipc/port.h: Include file for TIPC port code
  *
  * Copyright (c) 1994-2006, Ericsson AB
  * Copyright (c) 2004-2005, 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 "core.h"
 #include "ref.h"
 #include "net.h"
 #include "msg.h"
 #include "dbg.h"
 #include "node_subscr.h"

 /**
  * struct user_port - TIPC user port (used with native API)
  * @user_ref: id of user who created user port
  * @usr_handle: user-specified field
  * @ref: object reference to associated TIPC port
  * <various callback routines>
  * @uport_list: adjacent user ports in list of ports held by user
  */

 struct user_port {
 	u32 user_ref;
 	void *usr_handle;
 	u32 ref;
 	tipc_msg_err_event err_cb;
 	tipc_named_msg_err_event named_err_cb;
 	tipc_conn_shutdown_event conn_err_cb;
 	tipc_msg_event msg_cb;
 	tipc_named_msg_event named_msg_cb;
 	tipc_conn_msg_event conn_msg_cb;
 	tipc_continue_event continue_event_cb;
 	struct list_head uport_list;
 };

 /**
  * struct port - TIPC port structure
  * @publ: TIPC port info available to privileged users
  * @port_list: adjacent ports in TIPC's global list of ports
  * @dispatcher: ptr to routine which handles received messages
  * @wakeup: ptr to routine to call when port is no longer congested
  * @user_port: ptr to user port associated with port (if any)
  * @wait_list: adjacent ports in list of ports waiting on link congestion
  * @congested_link: ptr to congested link port is waiting on
  * @waiting_pkts:
  * @sent:
  * @acked:
  * @publications: list of publications for port
  * @pub_count: total # of publications port has made during its lifetime
  * @max_pkt: maximum packet size "hint" used when building messages sent by port
  * @probing_state:
  * @probing_interval:
  * @last_in_seqno:
  * @timer_ref:
  * @subscription: "node down" subscription used to terminate failed connections
  */

 struct port {
 	struct tipc_port publ;
 	struct list_head port_list;
 	u32 (*dispatcher)(struct tipc_port *, struct sk_buff *);
 	void (*wakeup)(struct tipc_port *);
 	struct user_port *user_port;
 	struct list_head wait_list;
 	struct link *congested_link;
 	u32 waiting_pkts;
 	u32 sent;
 	u32 acked;
 	struct list_head publications;
 	u32 pub_count;
 	u32 max_pkt;
 	u32 probing_state;
 	u32 probing_interval;
 	u32 last_in_seqno;
 	struct timer_list timer;
 	struct node_subscr subscription;
 };

 extern spinlock_t tipc_port_list_lock;
 struct port_list;

 int tipc_port_recv_sections(struct port *p_ptr, u32 num_sect,
 			    struct iovec const *msg_sect);
 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
 			      struct iovec const *msg_sect, u32 num_sect,
 			      int err);
 struct sk_buff *tipc_port_get_ports(void);
 struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space);
 void tipc_port_recv_proto_msg(struct sk_buff *buf);
 void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp);
 void tipc_port_reinit(void);

 /**
  * tipc_port_lock - lock port instance referred to and return its pointer
  */

 static inline struct port *tipc_port_lock(u32 ref)
 {
 	return (struct 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 port *p_ptr)
 {
 	spin_unlock_bh(p_ptr->publ.lock);
 }

 static inline struct port* tipc_port_deref(u32 ref)
 {
 	return (struct port *)tipc_ref_deref(ref);
 }

 static inline u32 tipc_peer_port(struct port *p_ptr)
 {
 	return msg_destport(&p_ptr->publ.phdr);
 }

 static inline u32 tipc_peer_node(struct port *p_ptr)
 {
 	return msg_destnode(&p_ptr->publ.phdr);
 }

 static inline int tipc_port_congested(struct port *p_ptr)
 {
 	return((p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2));
 }

 /**
  * tipc_port_recv_msg - receive message from lower layer and deliver to port user
  */

 static inline int tipc_port_recv_msg(struct sk_buff *buf)
 {
 	struct port *p_ptr;
 	struct tipc_msg *msg = buf_msg(buf);
 	u32 destport = msg_destport(msg);
 	u32 dsz = msg_data_sz(msg);
 	u32 err;

 	/* forward unresolved named message */
 	if (unlikely(!destport)) {
 		tipc_net_route_msg(buf);
 		return dsz;
 	}

 	/* validate destination & pass to port, otherwise reject message */
 	p_ptr = tipc_port_lock(destport);
 	if (likely(p_ptr)) {
 		if (likely(p_ptr->publ.connected)) {
 			if ((unlikely(msg_origport(msg) != tipc_peer_port(p_ptr))) ||
 			    (unlikely(msg_orignode(msg) != tipc_peer_node(p_ptr))) ||
 			    (unlikely(!msg_connected(msg)))) {
 				err = TIPC_ERR_NO_PORT;
 				tipc_port_unlock(p_ptr);
 				goto reject;
 			}
 		}
 		err = p_ptr->dispatcher(&p_ptr->publ, buf);
 		tipc_port_unlock(p_ptr);
 		if (likely(!err))
 			return dsz;
 	} else {
 		err = TIPC_ERR_NO_PORT;
 	}
 reject:
 	dbg("port->rejecting, err = %x..\n",err);
 	return tipc_reject_msg(buf, err);
 }

 #endif
	/*
	* net/tipc/port.h: Include file for TIPC port code
	*
	* Copyright (c) 1994-2006, Ericsson AB
	* Copyright (c) 2004-2005, 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 "core.h"
	#include "ref.h"
	#include "net.h"
	#include "msg.h"
	#include "dbg.h"
	#include "node_subscr.h"

	/**
	* struct user_port - TIPC user port (used with native API)
	* @user_ref: id of user who created user port
	* @usr_handle: user-specified field
	* @ref: object reference to associated TIPC port
	* <various callback routines>
	* @uport_list: adjacent user ports in list of ports held by user
	*/

	struct user_port {
	u32 user_ref;
	void *usr_handle;
	u32 ref;
	tipc_msg_err_event err_cb;
	tipc_named_msg_err_event named_err_cb;
	tipc_conn_shutdown_event conn_err_cb;
	tipc_msg_event msg_cb;
	tipc_named_msg_event named_msg_cb;
	tipc_conn_msg_event conn_msg_cb;
	tipc_continue_event continue_event_cb;
	struct list_head uport_list;
	};

	/**
	* struct port - TIPC port structure
	* @publ: TIPC port info available to privileged users
	* @port_list: adjacent ports in TIPC's global list of ports
	* @dispatcher: ptr to routine which handles received messages
	* @wakeup: ptr to routine to call when port is no longer congested
	* @user_port: ptr to user port associated with port (if any)
	* @wait_list: adjacent ports in list of ports waiting on link congestion
	* @congested_link: ptr to congested link port is waiting on
	* @waiting_pkts:
	* @sent:
	* @acked:
	* @publications: list of publications for port
	* @pub_count: total # of publications port has made during its lifetime
	* @max_pkt: maximum packet size "hint" used when building messages sent by port
	* @probing_state:
	* @probing_interval:
	* @last_in_seqno:
	* @timer_ref:
	* @subscription: "node down" subscription used to terminate failed connections
	*/

	struct port {
	struct tipc_port publ;
	struct list_head port_list;
	u32 (dispatcher)(struct tipc_port , struct sk_buff *);
	void (wakeup)(struct tipc_port );
	struct user_port *user_port;
	struct list_head wait_list;
	struct link *congested_link;
	u32 waiting_pkts;
	u32 sent;
	u32 acked;
	struct list_head publications;
	u32 pub_count;
	u32 max_pkt;
	u32 probing_state;
	u32 probing_interval;
	u32 last_in_seqno;
	struct timer_list timer;
	struct node_subscr subscription;
	};

	extern spinlock_t tipc_port_list_lock;
	struct port_list;

	int tipc_port_recv_sections(struct port *p_ptr, u32 num_sect,
	struct iovec const *msg_sect);
	int tipc_port_reject_sections(struct port p_ptr, struct tipc_msg hdr,
	struct iovec const *msg_sect, u32 num_sect,
	int err);
	struct sk_buff *tipc_port_get_ports(void);
	struct sk_buff port_show_stats(const void req_tlv_area, int req_tlv_space);
	void tipc_port_recv_proto_msg(struct sk_buff *buf);
	void tipc_port_recv_mcast(struct sk_buff buf, struct port_list dp);
	void tipc_port_reinit(void);

	/**
	* tipc_port_lock - lock port instance referred to and return its pointer
	*/

	static inline struct port *tipc_port_lock(u32 ref)
	{
	return (struct 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 port *p_ptr)
	{
	spin_unlock_bh(p_ptr->publ.lock);
	}

	static inline struct port* tipc_port_deref(u32 ref)
	{
	return (struct port *)tipc_ref_deref(ref);
	}

	static inline u32 tipc_peer_port(struct port *p_ptr)
	{
	return msg_destport(&p_ptr->publ.phdr);
	}

	static inline u32 tipc_peer_node(struct port *p_ptr)
	{
	return msg_destnode(&p_ptr->publ.phdr);
	}

	static inline int tipc_port_congested(struct port *p_ptr)
	{
	return((p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2));
	}

	/**
	* tipc_port_recv_msg - receive message from lower layer and deliver to port user
	*/

	static inline int tipc_port_recv_msg(struct sk_buff *buf)
	{
	struct port *p_ptr;
	struct tipc_msg *msg = buf_msg(buf);
	u32 destport = msg_destport(msg);
	u32 dsz = msg_data_sz(msg);
	u32 err;

	/* forward unresolved named message */
	if (unlikely(!destport)) {
	tipc_net_route_msg(buf);
	return dsz;
	}

	/* validate destination & pass to port, otherwise reject message */
	p_ptr = tipc_port_lock(destport);
	if (likely(p_ptr)) {
	if (likely(p_ptr->publ.connected)) {
	if ((unlikely(msg_origport(msg) != tipc_peer_port(p_ptr))) \|\|
	(unlikely(msg_orignode(msg) != tipc_peer_node(p_ptr))) \|\|
	(unlikely(!msg_connected(msg)))) {
	err = TIPC_ERR_NO_PORT;
	tipc_port_unlock(p_ptr);
	goto reject;
	}
	}
	err = p_ptr->dispatcher(&p_ptr->publ, buf);
	tipc_port_unlock(p_ptr);
	if (likely(!err))
	return dsz;
	} else {
	err = TIPC_ERR_NO_PORT;
	}
	reject:
	dbg("port->rejecting, err = %x..\n",err);
	return tipc_reject_msg(buf, err);
	}

	#endif