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1 /*-
2  * Copyright (c) 2012 The FreeBSD Foundation
3  * All rights reserved.
4  *
5  * This software was developed by Edward Tomasz Napierala under sponsorship
6  * from the FreeBSD Foundation.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  * $FreeBSD$
30  */
31
32 #ifndef ISCSI_H
33 #define ISCSI_H
34
35 struct iscsi_softc;
36 struct icl_conn;
37
38 #define ISCSI_NAME_LEN          224     /* 223 bytes, by RFC 3720, + '\0' */
39 #define ISCSI_ADDR_LEN          47      /* INET6_ADDRSTRLEN + '\0' */
40 #define ISCSI_SECRET_LEN        17      /* 16 + '\0' */
41
42 struct iscsi_outstanding {
43         TAILQ_ENTRY(iscsi_outstanding)  io_next;
44         union ccb                       *io_ccb;
45         size_t                          io_received;
46         uint32_t                        io_initiator_task_tag;
47         uint32_t                        io_datasn;
48 };
49
50 struct iscsi_session {
51         TAILQ_ENTRY(iscsi_session)      is_next;
52
53         struct icl_conn                 *is_conn;
54         struct mtx                      is_lock;
55
56         uint32_t                        is_statsn;
57         uint32_t                        is_cmdsn;
58         uint32_t                        is_expcmdsn;
59         uint32_t                        is_maxcmdsn;
60         uint32_t                        is_initiator_task_tag;
61         int                             is_header_digest;
62         int                             is_data_digest;
63         int                             is_initial_r2t;
64         size_t                          is_max_burst_length;
65         size_t                          is_first_burst_length;
66         uint8_t                         is_isid[6];
67         bool                            is_immediate_data;
68         size_t                          is_max_data_segment_length;
69         char                            is_target_alias[ISCSI_ALIAS_LEN];
70
71         TAILQ_HEAD(, iscsi_outstanding) is_outstanding;
72         TAILQ_HEAD(, icl_pdu)           is_postponed;
73
74         struct callout                  is_callout;
75         unsigned int                    is_timeout;
76
77         /*
78          * XXX: This could be rewritten using a single variable,
79          *      but somehow it results in uglier code. 
80          */
81         /*
82          * We're waiting for iscsid(8); after iscsid_timeout
83          * expires, kernel will wake up an iscsid(8) to handle
84          * the session.
85          */
86         bool                            is_waiting_for_iscsid;
87
88         /*
89          * Some iscsid(8) instance is handling the session;
90          * after login_timeout expires, kernel will wake up
91          * another iscsid(8) to handle the session.
92          */
93         bool                            is_login_phase;
94
95         /*
96          * We're in the process of removing the iSCSI session.
97          */
98         bool                            is_terminating;
99
100         /*
101          * We're waiting for the maintenance thread to do some
102          * reconnection tasks.
103          */
104         bool                            is_reconnecting;
105
106         bool                            is_connected;
107
108         struct cam_devq                 *is_devq;
109         struct cam_sim                  *is_sim;
110         struct cam_path                 *is_path;
111         struct cv                       is_maintenance_cv;
112         struct iscsi_softc              *is_softc;
113         unsigned int                    is_id;
114         struct iscsi_session_conf       is_conf;
115         bool                            is_simq_frozen;
116
117         char                            is_reason[ISCSI_REASON_LEN];
118
119 #ifdef ICL_KERNEL_PROXY
120         struct cv                       is_login_cv;;
121         struct icl_pdu                  *is_login_pdu;
122 #endif
123 };
124
125 struct iscsi_softc {
126         device_t                        sc_dev;
127         struct sx                       sc_lock;
128         struct cdev                     *sc_cdev;
129         TAILQ_HEAD(, iscsi_session)     sc_sessions;
130         struct cv                       sc_cv;
131         unsigned int                    sc_last_session_id;
132         eventhandler_tag                sc_shutdown_eh;
133 };
134
135 #endif /* !ISCSI_H */