port.h

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/*
 * net/tipc/port.h: Include file for TIPC port code
 *
 * Copyright (c) 1994-2007, Ericsson AB
 * Copyright (c) 2004-2007, 2010-2011, 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_FLOW_CONTROL_WIN 512

typedef void (*tipc_msg_err_event) (void *usr_handle, u32 portref,
        struct sk_buff **buf, unsigned char const *data,
        unsigned int size, int reason,
        struct tipc_portid const *attmpt_destid);

typedef void (*tipc_named_msg_err_event) (void *usr_handle, u32 portref,
        struct sk_buff **buf, unsigned char const *data,
        unsigned int size, int reason,
        struct tipc_name_seq const *attmpt_dest);

typedef void (*tipc_conn_shutdown_event) (void *usr_handle, u32 portref,
        struct sk_buff **buf, unsigned char const *data,
        unsigned int size, int reason);

typedef void (*tipc_msg_event) (void *usr_handle, u32 portref,
        struct sk_buff **buf, unsigned char const *data,
        unsigned int size, unsigned int importance,
        struct tipc_portid const *origin);

typedef void (*tipc_named_msg_event) (void *usr_handle, u32 portref,
        struct sk_buff **buf, unsigned char const *data,
        unsigned int size, unsigned int importance,
        struct tipc_portid const *orig,
        struct tipc_name_seq const *dest);

typedef void (*tipc_conn_msg_event) (void *usr_handle, u32 portref,
        struct sk_buff **buf, unsigned char const *data,
        unsigned int size);

typedef void (*tipc_continue_event) (void *usr_handle, u32 portref);

struct user_port {
    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 tipc_port {
    void *usr_handle;
    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;
    u32 (*dispatcher)(struct tipc_port *, struct sk_buff *);
    void (*wakeup)(struct tipc_port *);
    struct user_port *user_port;
    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
 */
struct tipc_port *tipc_createport_raw(void *usr_handle,
        u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
        void (*wakeup)(struct tipc_port *), const u32 importance);

int tipc_reject_msg(struct sk_buff *buf, u32 err);

int tipc_send_buf_fast(struct sk_buff *buf, u32 destnode);

void tipc_acknowledge(u32 port_ref, u32 ack);

int tipc_createport(void *usr_handle,
        unsigned int importance, tipc_msg_err_event error_cb,
        tipc_named_msg_err_event named_error_cb,
        tipc_conn_shutdown_event conn_error_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, u32 *portref);

int tipc_deleteport(u32 portref);

int tipc_portimportance(u32 portref, unsigned int *importance);
int tipc_set_portimportance(u32 portref, unsigned int importance);

int tipc_portunreliable(u32 portref, unsigned int *isunreliable);
int tipc_set_portunreliable(u32 portref, unsigned int isunreliable);

int tipc_portunreturnable(u32 portref, unsigned int *isunreturnable);
int tipc_set_portunreturnable(u32 portref, unsigned int isunreturnable);

int tipc_publish(u32 portref, unsigned int scope,
        struct tipc_name_seq const *name_seq);
int tipc_withdraw(u32 portref, unsigned int scope,
        struct tipc_name_seq const *name_seq);

int tipc_connect2port(u32 portref, struct tipc_portid const *port);

int tipc_disconnect(u32 portref);

int tipc_shutdown(u32 ref);


/*
 * The following routines require that the port be locked on entry
 */
int tipc_disconnect_port(struct tipc_port *tp_ptr);
int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg);

/*
 * TIPC messaging routines
 */
int tipc_port_recv_msg(struct sk_buff *buf);
int tipc_send(u32 portref, unsigned int num_sect, struct iovec const *msg_sect,
          unsigned int total_len);

int tipc_send2name(u32 portref, struct tipc_name const *name, u32 domain,
           unsigned int num_sect, struct iovec const *msg_sect,
           unsigned int total_len);

int tipc_send2port(u32 portref, struct tipc_portid const *dest,
           unsigned int num_sect, struct iovec const *msg_sect,
           unsigned int total_len);

int tipc_send_buf2port(u32 portref, struct tipc_portid const *dest,
        struct sk_buff *buf, unsigned int dsz);

int tipc_multicast(u32 portref, struct tipc_name_seq const *seq,
           unsigned int section_count, struct iovec const *msg,
           unsigned int total_len);

int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
                  struct iovec const *msg_sect, u32 num_sect,
                  unsigned int total_len, int err);
struct sk_buff *tipc_port_get_ports(void);
void tipc_port_recv_proto_msg(struct sk_buff *buf);
void tipc_port_recv_mcast(struct sk_buff *buf, struct tipc_port_list *dp);
void tipc_port_reinit(void);

static inline struct tipc_port *tipc_port_lock(u32 ref)
{
    return (struct tipc_port *)tipc_ref_lock(ref);
}

static inline void tipc_port_unlock(struct tipc_port *p_ptr)
{
    spin_unlock_bh(p_ptr->lock);
}

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

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

#endif