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 O2CLUSTER_TCP_H
28#define O2CLUSTER_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 o2net_msg
41{
42	__be16 magic;
43	__be16 data_len;
44	__be16 msg_type;
45	__be16 pad1;
46	__be32 sys_status;
47	__be32 status;
48	__be32 key;
49	__be32 msg_num;
50	__u8  buf[0];
51};
52
53typedef int (o2net_msg_handler_func)(struct o2net_msg *msg, u32 len, void *data,
54				     void **ret_data);
55typedef void (o2net_post_msg_handler_func)(int status, void *data,
56					   void *ret_data);
57
58#define O2NET_MAX_PAYLOAD_BYTES  (4096 - sizeof(struct o2net_msg))
59
60/* same as hb delay, we're waiting for another node to recognize our hb */
61#define O2NET_RECONNECT_DELAY_MS_DEFAULT	2000
62
63#define O2NET_KEEPALIVE_DELAY_MS_DEFAULT	2000
64#define O2NET_IDLE_TIMEOUT_MS_DEFAULT		30000
65
66#define O2NET_TCP_USER_TIMEOUT			0x7fffffff
67
68/* TODO: figure this out.... */
69static inline int o2net_link_down(int err, struct socket *sock)
70{
71	if (sock) {
72		if (sock->sk->sk_state != TCP_ESTABLISHED &&
73	    	    sock->sk->sk_state != TCP_CLOSE_WAIT)
74			return 1;
75	}
76
77	if (err >= 0)
78		return 0;
79	switch (err) {
80		/* ????????????????????????? */
81		case -ERESTARTSYS:
82		case -EBADF:
83		/* When the server has died, an ICMP port unreachable
84		 * message prompts ECONNREFUSED. */
85		case -ECONNREFUSED:
86		case -ENOTCONN:
87		case -ECONNRESET:
88		case -EPIPE:
89			return 1;
90	}
91	return 0;
92}
93
94enum {
95	O2NET_DRIVER_UNINITED,
96	O2NET_DRIVER_READY,
97};
98
99int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
100		       u8 target_node, int *status);
101int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *vec,
102			   size_t veclen, u8 target_node, int *status);
103
104int o2net_register_handler(u32 msg_type, u32 key, u32 max_len,
105			   o2net_msg_handler_func *func, void *data,
106			   o2net_post_msg_handler_func *post_func,
107			   struct list_head *unreg_list);
108void o2net_unregister_handler_list(struct list_head *list);
109
110void o2net_fill_node_map(unsigned long *map, unsigned bytes);
111
112struct o2nm_node;
113int o2net_register_hb_callbacks(void);
114void o2net_unregister_hb_callbacks(void);
115int o2net_start_listening(struct o2nm_node *node);
116void o2net_stop_listening(struct o2nm_node *node);
117void o2net_disconnect_node(struct o2nm_node *node);
118int o2net_num_connected_peers(void);
119
120int o2net_init(void);
121void o2net_exit(void);
122
123struct o2net_send_tracking;
124struct o2net_sock_container;
125
126#ifdef CONFIG_DEBUG_FS
127int o2net_debugfs_init(void);
128void o2net_debugfs_exit(void);
129void o2net_debug_add_nst(struct o2net_send_tracking *nst);
130void o2net_debug_del_nst(struct o2net_send_tracking *nst);
131void o2net_debug_add_sc(struct o2net_sock_container *sc);
132void o2net_debug_del_sc(struct o2net_sock_container *sc);
133#else
134static inline int o2net_debugfs_init(void)
135{
136	return 0;
137}
138static inline void o2net_debugfs_exit(void)
139{
140}
141static inline void o2net_debug_add_nst(struct o2net_send_tracking *nst)
142{
143}
144static inline void o2net_debug_del_nst(struct o2net_send_tracking *nst)
145{
146}
147static inline void o2net_debug_add_sc(struct o2net_sock_container *sc)
148{
149}
150static inline void o2net_debug_del_sc(struct o2net_sock_container *sc)
151{
152}
153#endif	/* CONFIG_DEBUG_FS */
154
155#endif /* O2CLUSTER_TCP_H */
156