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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         uint16_t                        is_tsih;
68         bool                            is_immediate_data;
69         size_t                          is_max_data_segment_length;
70         char                            is_target_alias[ISCSI_ALIAS_LEN];
71
72         TAILQ_HEAD(, iscsi_outstanding) is_outstanding;
73         STAILQ_HEAD(, icl_pdu)          is_postponed;
74
75         struct callout                  is_callout;
76         unsigned int                    is_timeout;
77
78         /*
79          * XXX: This could be rewritten using a single variable,
80          *      but somehow it results in uglier code. 
81          */
82         /*
83          * We're waiting for iscsid(8); after iscsid_timeout
84          * expires, kernel will wake up an iscsid(8) to handle
85          * the session.
86          */
87         bool                            is_waiting_for_iscsid;
88
89         /*
90          * Some iscsid(8) instance is handling the session;
91          * after login_timeout expires, kernel will wake up
92          * another iscsid(8) to handle the session.
93          */
94         bool                            is_login_phase;
95
96         /*
97          * We're in the process of removing the iSCSI session.
98          */
99         bool                            is_terminating;
100
101         /*
102          * We're waiting for the maintenance thread to do some
103          * reconnection tasks.
104          */
105         bool                            is_reconnecting;
106
107         bool                            is_connected;
108
109         struct cam_devq                 *is_devq;
110         struct cam_sim                  *is_sim;
111         struct cam_path                 *is_path;
112         struct cv                       is_maintenance_cv;
113         struct iscsi_softc              *is_softc;
114         unsigned int                    is_id;
115         struct iscsi_session_conf       is_conf;
116         bool                            is_simq_frozen;
117
118         char                            is_reason[ISCSI_REASON_LEN];
119
120 #ifdef ICL_KERNEL_PROXY
121         struct cv                       is_login_cv;;
122         struct icl_pdu                  *is_login_pdu;
123 #endif
124 };
125
126 struct iscsi_softc {
127         device_t                        sc_dev;
128         struct sx                       sc_lock;
129         struct cdev                     *sc_cdev;
130         TAILQ_HEAD(, iscsi_session)     sc_sessions;
131         struct cv                       sc_cv;
132         unsigned int                    sc_last_session_id;
133         eventhandler_tag                sc_shutdown_eh;
134 };
135
136 #endif /* !ISCSI_H */