xref: /openbmc/linux/fs/ocfs2/cluster/tcp_internal.h (revision fa60ce2c)
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * Copyright (C) 2005 Oracle.  All rights reserved.
4  */
5 
6 #ifndef O2CLUSTER_TCP_INTERNAL_H
7 #define O2CLUSTER_TCP_INTERNAL_H
8 
9 #define O2NET_MSG_MAGIC           ((u16)0xfa55)
10 #define O2NET_MSG_STATUS_MAGIC    ((u16)0xfa56)
11 #define O2NET_MSG_KEEP_REQ_MAGIC  ((u16)0xfa57)
12 #define O2NET_MSG_KEEP_RESP_MAGIC ((u16)0xfa58)
13 
14 /* we're delaying our quorum decision so that heartbeat will have timed
15  * out truly dead nodes by the time we come around to making decisions
16  * on their number */
17 #define O2NET_QUORUM_DELAY_MS	((o2hb_dead_threshold + 2) * O2HB_REGION_TIMEOUT_MS)
18 
19 /*
20  * This version number represents quite a lot, unfortunately.  It not
21  * only represents the raw network message protocol on the wire but also
22  * locking semantics of the file system using the protocol.  It should
23  * be somewhere else, I'm sure, but right now it isn't.
24  *
25  * With version 11, we separate out the filesystem locking portion.  The
26  * filesystem now has a major.minor version it negotiates.  Version 11
27  * introduces this negotiation to the o2dlm protocol, and as such the
28  * version here in tcp_internal.h should not need to be bumped for
29  * filesystem locking changes.
30  *
31  * New in version 11
32  * 	- Negotiation of filesystem locking in the dlm join.
33  *
34  * New in version 10:
35  * 	- Meta/data locks combined
36  *
37  * New in version 9:
38  * 	- All votes removed
39  *
40  * New in version 8:
41  * 	- Replace delete inode votes with a cluster lock
42  *
43  * New in version 7:
44  * 	- DLM join domain includes the live nodemap
45  *
46  * New in version 6:
47  * 	- DLM lockres remote refcount fixes.
48  *
49  * New in version 5:
50  * 	- Network timeout checking protocol
51  *
52  * New in version 4:
53  * 	- Remove i_generation from lock names for better stat performance.
54  *
55  * New in version 3:
56  * 	- Replace dentry votes with a cluster lock
57  *
58  * New in version 2:
59  * 	- full 64 bit i_size in the metadata lock lvbs
60  * 	- introduction of "rw" lock and pushing meta/data locking down
61  */
62 #define O2NET_PROTOCOL_VERSION 11ULL
63 struct o2net_handshake {
64 	__be64	protocol_version;
65 	__be64	connector_id;
66 	__be32  o2hb_heartbeat_timeout_ms;
67 	__be32  o2net_idle_timeout_ms;
68 	__be32  o2net_keepalive_delay_ms;
69 	__be32  o2net_reconnect_delay_ms;
70 };
71 
72 struct o2net_node {
73 	/* this is never called from int/bh */
74 	spinlock_t			nn_lock;
75 
76 	/* set the moment an sc is allocated and a connect is started */
77 	struct o2net_sock_container	*nn_sc;
78 	/* _valid is only set after the handshake passes and tx can happen */
79 	unsigned			nn_sc_valid:1;
80 	/* if this is set tx just returns it */
81 	int				nn_persistent_error;
82 	/* It is only set to 1 after the idle time out. */
83 	atomic_t			nn_timeout;
84 
85 	/* threads waiting for an sc to arrive wait on the wq for generation
86 	 * to increase.  it is increased when a connecting socket succeeds
87 	 * or fails or when an accepted socket is attached. */
88 	wait_queue_head_t		nn_sc_wq;
89 
90 	struct idr			nn_status_idr;
91 	struct list_head		nn_status_list;
92 
93 	/* connects are attempted from when heartbeat comes up until either hb
94 	 * goes down, the node is unconfigured, or a connect succeeds.
95 	 * connect_work is queued from set_nn_state both from hb up and from
96 	 * itself if a connect attempt fails and so can be self-arming.
97 	 * shutdown is careful to first mark the nn such that no connects will
98 	 * be attempted before canceling delayed connect work and flushing the
99 	 * queue. */
100 	struct delayed_work		nn_connect_work;
101 	unsigned long			nn_last_connect_attempt;
102 
103 	/* this is queued as nodes come up and is canceled when a connection is
104 	 * established.  this expiring gives up on the node and errors out
105 	 * transmits */
106 	struct delayed_work		nn_connect_expired;
107 
108 	/* after we give up on a socket we wait a while before deciding
109 	 * that it is still heartbeating and that we should do some
110 	 * quorum work */
111 	struct delayed_work		nn_still_up;
112 };
113 
114 struct o2net_sock_container {
115 	struct kref		sc_kref;
116 	/* the next two are valid for the life time of the sc */
117 	struct socket		*sc_sock;
118 	struct o2nm_node	*sc_node;
119 
120 	/* all of these sc work structs hold refs on the sc while they are
121 	 * queued.  they should not be able to ref a freed sc.  the teardown
122 	 * race is with o2net_wq destruction in o2net_stop_listening() */
123 
124 	/* rx and connect work are generated from socket callbacks.  sc
125 	 * shutdown removes the callbacks and then flushes the work queue */
126 	struct work_struct	sc_rx_work;
127 	struct work_struct	sc_connect_work;
128 	/* shutdown work is triggered in two ways.  the simple way is
129 	 * for a code path calls ensure_shutdown which gets a lock, removes
130 	 * the sc from the nn, and queues the work.  in this case the
131 	 * work is single-shot.  the work is also queued from a sock
132 	 * callback, though, and in this case the work will find the sc
133 	 * still on the nn and will call ensure_shutdown itself.. this
134 	 * ends up triggering the shutdown work again, though nothing
135 	 * will be done in that second iteration.  so work queue teardown
136 	 * has to be careful to remove the sc from the nn before waiting
137 	 * on the work queue so that the shutdown work doesn't remove the
138 	 * sc and rearm itself.
139 	 */
140 	struct work_struct	sc_shutdown_work;
141 
142 	struct timer_list	sc_idle_timeout;
143 	struct delayed_work	sc_keepalive_work;
144 
145 	unsigned		sc_handshake_ok:1;
146 
147 	struct page 		*sc_page;
148 	size_t			sc_page_off;
149 
150 	/* original handlers for the sockets */
151 	void			(*sc_state_change)(struct sock *sk);
152 	void			(*sc_data_ready)(struct sock *sk);
153 
154 	u32			sc_msg_key;
155 	u16			sc_msg_type;
156 
157 #ifdef CONFIG_DEBUG_FS
158 	struct list_head        sc_net_debug_item;
159 	ktime_t			sc_tv_timer;
160 	ktime_t			sc_tv_data_ready;
161 	ktime_t			sc_tv_advance_start;
162 	ktime_t			sc_tv_advance_stop;
163 	ktime_t			sc_tv_func_start;
164 	ktime_t			sc_tv_func_stop;
165 #endif
166 #ifdef CONFIG_OCFS2_FS_STATS
167 	ktime_t			sc_tv_acquiry_total;
168 	ktime_t			sc_tv_send_total;
169 	ktime_t			sc_tv_status_total;
170 	u32			sc_send_count;
171 	u32			sc_recv_count;
172 	ktime_t			sc_tv_process_total;
173 #endif
174 	struct mutex		sc_send_lock;
175 };
176 
177 struct o2net_msg_handler {
178 	struct rb_node		nh_node;
179 	u32			nh_max_len;
180 	u32			nh_msg_type;
181 	u32			nh_key;
182 	o2net_msg_handler_func	*nh_func;
183 	void			*nh_func_data;
184 	o2net_post_msg_handler_func
185 				*nh_post_func;
186 	struct kref		nh_kref;
187 	struct list_head	nh_unregister_item;
188 };
189 
190 enum o2net_system_error {
191 	O2NET_ERR_NONE = 0,
192 	O2NET_ERR_NO_HNDLR,
193 	O2NET_ERR_OVERFLOW,
194 	O2NET_ERR_DIED,
195 	O2NET_ERR_MAX
196 };
197 
198 struct o2net_status_wait {
199 	enum o2net_system_error	ns_sys_status;
200 	s32			ns_status;
201 	int			ns_id;
202 	wait_queue_head_t	ns_wq;
203 	struct list_head	ns_node_item;
204 };
205 
206 #ifdef CONFIG_DEBUG_FS
207 /* just for state dumps */
208 struct o2net_send_tracking {
209 	struct list_head		st_net_debug_item;
210 	struct task_struct		*st_task;
211 	struct o2net_sock_container	*st_sc;
212 	u32				st_id;
213 	u32				st_msg_type;
214 	u32				st_msg_key;
215 	u8				st_node;
216 	ktime_t				st_sock_time;
217 	ktime_t				st_send_time;
218 	ktime_t				st_status_time;
219 };
220 #else
221 struct o2net_send_tracking {
222 	u32	dummy;
223 };
224 #endif	/* CONFIG_DEBUG_FS */
225 
226 #endif /* O2CLUSTER_TCP_INTERNAL_H */
227