LXR linux/drivers/staging/zcache/ramster/tcp.h

   1/* -*- mode: c; c-basic-offset: 8; -*-
   2 * vim: noexpandtab sw=8 ts=8 sts=0:
   3 *
   4 * tcp.h
   5 *
   6 * Function prototypes
   7 *
   8 * Copyright (C) 2004 Oracle.  All rights reserved.
   9 *
  10 * This program is free software; you can redistribute it and/or
  11 * modify it under the terms of the GNU General Public
  12 * License as published by the Free Software Foundation; either
  13 * version 2 of the License, or (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18 * General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public
  21 * License along with this program; if not, write to the
  22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 * Boston, MA 021110-1307, USA.
  24 *
  25 */
  26
  27#ifndef R2CLUSTER_TCP_H
  28#define R2CLUSTER_TCP_H
  29
  30#include <linux/socket.h>
  31#ifdef __KERNEL__
  32#include <net/sock.h>
  33#include <linux/tcp.h>
  34#else
  35#include <sys/socket.h>
  36#endif
  37#include <linux/inet.h>
  38#include <linux/in.h>
  39
  40struct r2net_msg {
  41        __be16 magic;
  42        __be16 data_len;
  43        __be16 msg_type;
  44        __be16 pad1;
  45        __be32 sys_status;
  46        __be32 status;
  47        __be32 key;
  48        __be32 msg_num;
  49        __u8  buf[0];
  50};
  51
  52typedef int (r2net_msg_handler_func)(struct r2net_msg *msg, u32 len, void *data,
  53                                     void **ret_data);
  54typedef void (r2net_post_msg_handler_func)(int status, void *data,
  55                                           void *ret_data);
  56
  57#define R2NET_MAX_PAYLOAD_BYTES  (4096 - sizeof(struct r2net_msg))
  58
  59/* same as hb delay, we're waiting for another node to recognize our hb */
  60#define R2NET_RECONNECT_DELAY_MS_DEFAULT        2000
  61
  62#define R2NET_KEEPALIVE_DELAY_MS_DEFAULT        2000
  63#define R2NET_IDLE_TIMEOUT_MS_DEFAULT           30000
  64
  65
  66/* TODO: figure this out.... */
  67static inline int r2net_link_down(int err, struct socket *sock)
  68{
  69        if (sock) {
  70                if (sock->sk->sk_state != TCP_ESTABLISHED &&
  71                        sock->sk->sk_state != TCP_CLOSE_WAIT)
  72                        return 1;
  73        }
  74
  75        if (err >= 0)
  76                return 0;
  77        switch (err) {
  78
  79        /* ????????????????????????? */
  80        case -ERESTARTSYS:
  81        case -EBADF:
  82        /* When the server has died, an ICMP port unreachable
  83         * message prompts ECONNREFUSED. */
  84        case -ECONNREFUSED:
  85        case -ENOTCONN:
  86        case -ECONNRESET:
  87        case -EPIPE:
  88                return 1;
  89
  90        }
  91        return 0;
  92}
  93
  94enum {
  95        R2NET_DRIVER_UNINITED,
  96        R2NET_DRIVER_READY,
  97};
  98
  99int r2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
 100                       u8 target_node, int *status);
 101int r2net_send_message_vec(u32 msg_type, u32 key, struct kvec *vec,
 102                           size_t veclen, u8 target_node, int *status);
 103
 104int r2net_register_handler(u32 msg_type, u32 key, u32 max_len,
 105                           r2net_msg_handler_func *func, void *data,
 106                           r2net_post_msg_handler_func *post_func,
 107                           struct list_head *unreg_list);
 108void r2net_unregister_handler_list(struct list_head *list);
 109
 110void r2net_fill_node_map(unsigned long *map, unsigned bytes);
 111
 112void r2net_force_data_magic(struct r2net_msg *, u16, u32);
 113void r2net_hb_node_up_manual(int);
 114struct r2net_node *r2net_nn_from_num(u8);
 115
 116struct r2nm_node;
 117int r2net_register_hb_callbacks(void);
 118void r2net_unregister_hb_callbacks(void);
 119int r2net_start_listening(struct r2nm_node *node);
 120void r2net_stop_listening(struct r2nm_node *node);
 121void r2net_disconnect_node(struct r2nm_node *node);
 122int r2net_num_connected_peers(void);
 123
 124int r2net_init(void);
 125void r2net_exit(void);
 126
 127struct r2net_send_tracking;
 128struct r2net_sock_container;
 129
 130#if 0
 131int r2net_debugfs_init(void);
 132void r2net_debugfs_exit(void);
 133void r2net_debug_add_nst(struct r2net_send_tracking *nst);
 134void r2net_debug_del_nst(struct r2net_send_tracking *nst);
 135void r2net_debug_add_sc(struct r2net_sock_container *sc);
 136void r2net_debug_del_sc(struct r2net_sock_container *sc);
 137#else
 138static inline int r2net_debugfs_init(void)
 139{
 140        return 0;
 141}
 142static inline void r2net_debugfs_exit(void)
 143{
 144}
 145static inline void r2net_debug_add_nst(struct r2net_send_tracking *nst)
 146{
 147}
 148static inline void r2net_debug_del_nst(struct r2net_send_tracking *nst)
 149{
 150}
 151static inline void r2net_debug_add_sc(struct r2net_sock_container *sc)
 152{
 153}
 154static inline void r2net_debug_del_sc(struct r2net_sock_container *sc)
 155{
 156}
 157#endif  /* CONFIG_DEBUG_FS */
 158
 159#endif /* R2CLUSTER_TCP_H */
 160