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1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * Copyright (C) 2005 Oracle. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public
17 * License along with this program; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 021110-1307, USA.
20 */
21
22#ifndef O2CLUSTER_TCP_INTERNAL_H
23#define O2CLUSTER_TCP_INTERNAL_H
24
25#define O2NET_MSG_MAGIC ((u16)0xfa55)
26#define O2NET_MSG_STATUS_MAGIC ((u16)0xfa56)
27#define O2NET_MSG_KEEP_REQ_MAGIC ((u16)0xfa57)
28#define O2NET_MSG_KEEP_RESP_MAGIC ((u16)0xfa58)
29
30/* same as hb delay, we're waiting for another node to recognize our hb */
31#define O2NET_RECONNECT_DELAY_MS O2HB_REGION_TIMEOUT_MS
32
33/* we're delaying our quorum decision so that heartbeat will have timed
34 * out truly dead nodes by the time we come around to making decisions
35 * on their number */
36#define O2NET_QUORUM_DELAY_MS ((o2hb_dead_threshold + 2) * O2HB_REGION_TIMEOUT_MS)
37
38#define O2NET_KEEPALIVE_DELAY_SECS 5
39#define O2NET_IDLE_TIMEOUT_SECS 10
40
41/*
42 * This version number represents quite a lot, unfortunately. It not
43 * only represents the raw network message protocol on the wire but also
44 * locking semantics of the file system using the protocol. It should
45 * be somewhere else, I'm sure, but right now it isn't.
46 *
47 * New in version 2:
48 * - full 64 bit i_size in the metadata lock lvbs
49 * - introduction of "rw" lock and pushing meta/data locking down
50 */
51#define O2NET_PROTOCOL_VERSION 2ULL
52struct o2net_handshake {
53 __be64 protocol_version;
54 __be64 connector_id;
55};
56
57struct o2net_node {
58 /* this is never called from int/bh */
59 spinlock_t nn_lock;
60
61 /* set the moment an sc is allocated and a connect is started */
62 struct o2net_sock_container *nn_sc;
63 /* _valid is only set after the handshake passes and tx can happen */
64 unsigned nn_sc_valid:1;
65 /* if this is set tx just returns it */
66 int nn_persistent_error;
67
68 /* threads waiting for an sc to arrive wait on the wq for generation
69 * to increase. it is increased when a connecting socket succeeds
70 * or fails or when an accepted socket is attached. */
71 wait_queue_head_t nn_sc_wq;
72
73 struct idr nn_status_idr;
74 struct list_head nn_status_list;
75
76 /* connects are attempted from when heartbeat comes up until either hb
77 * goes down, the node is unconfigured, no connect attempts succeed
78 * before O2NET_CONN_IDLE_DELAY, or a connect succeeds. connect_work
79 * is queued from set_nn_state both from hb up and from itself if a
80 * connect attempt fails and so can be self-arming. shutdown is
81 * careful to first mark the nn such that no connects will be attempted
82 * before canceling delayed connect work and flushing the queue. */
83 struct work_struct nn_connect_work;
84 unsigned long nn_last_connect_attempt;
85
86 /* this is queued as nodes come up and is canceled when a connection is
87 * established. this expiring gives up on the node and errors out
88 * transmits */
89 struct work_struct nn_connect_expired;
90
91 /* after we give up on a socket we wait a while before deciding
92 * that it is still heartbeating and that we should do some
93 * quorum work */
94 struct work_struct nn_still_up;
95};
96
97struct o2net_sock_container {
98 struct kref sc_kref;
99 /* the next two are vaild for the life time of the sc */
100 struct socket *sc_sock;
101 struct o2nm_node *sc_node;
102
103 /* all of these sc work structs hold refs on the sc while they are
104 * queued. they should not be able to ref a freed sc. the teardown
105 * race is with o2net_wq destruction in o2net_stop_listening() */
106
107 /* rx and connect work are generated from socket callbacks. sc
108 * shutdown removes the callbacks and then flushes the work queue */
109 struct work_struct sc_rx_work;
110 struct work_struct sc_connect_work;
111 /* shutdown work is triggered in two ways. the simple way is
112 * for a code path calls ensure_shutdown which gets a lock, removes
113 * the sc from the nn, and queues the work. in this case the
114 * work is single-shot. the work is also queued from a sock
115 * callback, though, and in this case the work will find the sc
116 * still on the nn and will call ensure_shutdown itself.. this
117 * ends up triggering the shutdown work again, though nothing
118 * will be done in that second iteration. so work queue teardown
119 * has to be careful to remove the sc from the nn before waiting
120 * on the work queue so that the shutdown work doesn't remove the
121 * sc and rearm itself.
122 */
123 struct work_struct sc_shutdown_work;
124
125 struct timer_list sc_idle_timeout;
126 struct work_struct sc_keepalive_work;
127
128 unsigned sc_handshake_ok:1;
129
130 struct page *sc_page;
131 size_t sc_page_off;
132
133 /* original handlers for the sockets */
134 void (*sc_state_change)(struct sock *sk);
135 void (*sc_data_ready)(struct sock *sk, int bytes);
136
137 struct timeval sc_tv_timer;
138 struct timeval sc_tv_data_ready;
139 struct timeval sc_tv_advance_start;
140 struct timeval sc_tv_advance_stop;
141 struct timeval sc_tv_func_start;
142 struct timeval sc_tv_func_stop;
143 u32 sc_msg_key;
144 u16 sc_msg_type;
145};
146
147struct o2net_msg_handler {
148 struct rb_node nh_node;
149 u32 nh_max_len;
150 u32 nh_msg_type;
151 u32 nh_key;
152 o2net_msg_handler_func *nh_func;
153 o2net_msg_handler_func *nh_func_data;
154 struct kref nh_kref;
155 struct list_head nh_unregister_item;
156};
157
158enum o2net_system_error {
159 O2NET_ERR_NONE = 0,
160 O2NET_ERR_NO_HNDLR,
161 O2NET_ERR_OVERFLOW,
162 O2NET_ERR_DIED,
163 O2NET_ERR_MAX
164};
165
166struct o2net_status_wait {
167 enum o2net_system_error ns_sys_status;
168 s32 ns_status;
169 int ns_id;
170 wait_queue_head_t ns_wq;
171 struct list_head ns_node_item;
172};
173
174#endif /* O2CLUSTER_TCP_INTERNAL_H */
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