xref: /illumos-gate/usr/src/uts/common/io/comstar/port/iscsit/iscsit_isns.h (revision 4558d122136f151d62acbbc02ddb42df89a5ef66)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
23  */
24 #ifndef _ISNS_CLIENT_H_
25 #define	_ISNS_CLIENT_H_
26 
27 #include "iscsit.h"
28 
29 /*
30  * List of iSNS servers with which we register.
31  */
32 
33 typedef struct {
34 	int			svr_retry_count;
35 	struct sockaddr_storage	svr_sa;
36 	clock_t			svr_last_msg;
37 	list_node_t		svr_ln;
38 	uint32_t		svr_registered:1,
39 				svr_reset_needed:1,
40 				svr_delete_needed:1,
41 				svr_targets_changed:1,
42 				svr_monitor_hold:1;
43 	uint32_t		svr_last_target_index;
44 	uint32_t		svr_esi_interval;
45 	avl_tree_t		svr_target_list;
46 } iscsit_isns_svr_t;
47 
48 /*
49  * Type of registration to perform (deregister, register, update)
50  */
51 typedef enum {
52 	ISNS_DEREGISTER_TARGET = 0,
53 	ISNS_DEREGISTER_ALL,
54 	ISNS_REGISTER_TARGET,
55 	ISNS_REGISTER_ALL,
56 	ISNS_MODIFY_TARGET
57 } isns_reg_type_t;
58 
59 /*
60  * This structure is used to keep state with regard to the RX threads used
61  * for ESI.
62  */
63 
64 
65 typedef struct {
66 	kthread_t			*esi_thread;
67 	kt_did_t			esi_thread_did;
68 	ksocket_t			esi_so;
69 	kmutex_t			esi_mutex;
70 	kcondvar_t			esi_cv;
71 	uint16_t			esi_port;
72 	boolean_t			esi_enabled;
73 	boolean_t			esi_valid;
74 	boolean_t			esi_thread_running;
75 } isns_esi_tinfo_t;
76 
77 
78 /*
79  * Portal list - both default portals from idm_get_ipaddr and portals
80  * defined in target port groups.
81  */
82 
83 typedef struct isns_portal_s {
84 	struct sockaddr_storage		portal_addr;
85 	avl_node_t			portal_node;
86 	timespec_t			portal_esi_timestamp;
87 	iscsit_portal_t			*portal_iscsit;	/* if in TPG */
88 	boolean_t			portal_default; /* if in default */
89 } isns_portal_t;
90 
91 
92 typedef struct isns_tpgt_addr_s {
93 	list_node_t		portal_ln;
94 	struct sockaddr_storage	portal_addr;
95 } isns_tpgt_addr_t;
96 
97 typedef struct isns_tpgt_s {
98 	list_node_t		ti_tpgt_ln;
99 	uint16_t		ti_tpgt_tag;
100 	list_t			ti_portal_list;
101 } isns_tpgt_t;
102 
103 typedef struct isns_target_info_s {
104 	idm_refcnt_t		ti_refcnt;
105 	char			ti_tgt_name[MAX_ISCSI_NODENAMELEN];
106 	char			ti_tgt_alias[MAX_ISCSI_NODENAMELEN];
107 	list_t			ti_tpgt_list;
108 } isns_target_info_t;
109 
110 /* Contents of isns_target_list and svr->svr_target_list */
111 typedef struct isns_target_s {
112 	iscsit_tgt_t		*target;
113 	avl_node_t		target_node;
114 	boolean_t		target_registered;
115 	boolean_t		target_update_needed;
116 	boolean_t		target_delete_needed;
117 	isns_target_info_t	*target_info;
118 } isns_target_t;
119 
120 /*
121  * If no ESI request is received within this number of intervals, we'll
122  * try to re-register with the server.
123  */
124 #define	MAX_ESI_INTERVALS			3
125 
126 /*
127  * Interval to ask the server to send us ESI probes, in seconds.
128  */
129 #define	ISNS_DEFAULT_ESI_INTERVAL		20
130 
131 /*
132  * Registration Period (when not using ESI), in seconds. (15 min)
133  */
134 #define	ISNS_DEFAULT_REGISTRATION_PERIOD	900
135 
136 /*
137  * Initial delay before sending first DevAttrReg message.
138  */
139 #define	ISNS_INITIAL_DELAY			5
140 
141 it_cfg_status_t
142 isnst_config_merge(it_config_t *cfg);
143 
144 int iscsit_isns_init(iscsit_hostinfo_t *hostinfo);
145 void iscsit_isns_fini();
146 int iscsit_isns_register(iscsit_tgt_t *target);
147 int iscsit_isns_deregister(iscsit_tgt_t *target);
148 void iscsit_isns_target_update(iscsit_tgt_t *target);
149 void iscsit_isns_portal_online(iscsit_portal_t *portal);
150 void iscsit_isns_portal_offline(iscsit_portal_t *portal);
151 
152 #endif /* _ISNS_CLIENT_H_ */
153