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1/*
2 * iSCSI lib definitions
3 *
4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2004 - 2006 Mike Christie
6 * Copyright (C) 2004 - 2005 Dmitry Yusupov
7 * Copyright (C) 2004 - 2005 Alex Aizman
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 */
23#ifndef LIBISCSI_H
24#define LIBISCSI_H
25
26#include <linux/types.h>
27#include <linux/mutex.h>
28#include <scsi/iscsi_proto.h>
29#include <scsi/iscsi_if.h>
30
31struct scsi_transport_template;
32struct scsi_device;
33struct Scsi_Host;
34struct scsi_cmnd;
35struct socket;
36struct iscsi_transport;
37struct iscsi_cls_session;
38struct iscsi_cls_conn;
39struct iscsi_session;
40struct iscsi_nopin;
41
42/* #define DEBUG_SCSI */
43#ifdef DEBUG_SCSI
44#define debug_scsi(fmt...) printk(KERN_INFO "iscsi: " fmt)
45#else
46#define debug_scsi(fmt...)
47#endif
48
49#define ISCSI_XMIT_CMDS_MAX 128 /* must be power of 2 */
50#define ISCSI_MGMT_CMDS_MAX 32 /* must be power of 2 */
51#define ISCSI_CONN_MAX 1
52
53#define ISCSI_MGMT_ITT_OFFSET 0xa00
54
55#define ISCSI_DEF_CMD_PER_LUN 32
56#define ISCSI_MAX_CMD_PER_LUN 128
57
58/* Task Mgmt states */
59#define TMABORT_INITIAL 0x0
60#define TMABORT_SUCCESS 0x1
61#define TMABORT_FAILED 0x2
62#define TMABORT_TIMEDOUT 0x3
63#define TMABORT_NOT_FOUND 0x4
64
65/* Connection suspend "bit" */
66#define ISCSI_SUSPEND_BIT 1
67
68#define ISCSI_ITT_MASK (0xfff)
69#define ISCSI_CID_SHIFT 12
70#define ISCSI_CID_MASK (0xffff << ISCSI_CID_SHIFT)
71#define ISCSI_AGE_SHIFT 28
72#define ISCSI_AGE_MASK (0xf << ISCSI_AGE_SHIFT)
73
74struct iscsi_mgmt_task {
75 /*
76 * Becuae LLDs allocate their hdr differently, this is a pointer to
77 * that storage. It must be setup at session creation time.
78 */
79 struct iscsi_hdr *hdr;
80 char *data; /* mgmt payload */
81 int data_count; /* counts data to be sent */
82 uint32_t itt; /* this ITT */
83 void *dd_data; /* driver/transport data */
84 struct list_head running;
85};
86
87enum {
88 ISCSI_TASK_COMPLETED,
89 ISCSI_TASK_PENDING,
90 ISCSI_TASK_RUNNING,
91};
92
93struct iscsi_cmd_task {
94 /*
95 * Becuae LLDs allocate their hdr differently, this is a pointer to
96 * that storage. It must be setup at session creation time.
97 */
98 struct iscsi_cmd *hdr;
99 int itt; /* this ITT */
100 int datasn; /* DataSN */
101
102 uint32_t unsol_datasn;
103 int imm_count; /* imm-data (bytes) */
104 int unsol_count; /* unsolicited (bytes)*/
105 /* offset in unsolicited stream (bytes); */
106 int unsol_offset;
107 int data_count; /* remaining Data-Out */
108 struct scsi_cmnd *sc; /* associated SCSI cmd*/
109 int total_length;
110 struct iscsi_conn *conn; /* used connection */
111 struct iscsi_mgmt_task *mtask; /* tmf mtask in progr */
112
113 /* state set/tested under session->lock */
114 int state;
115 atomic_t refcount;
116 struct list_head running; /* running cmd list */
117 void *dd_data; /* driver/transport data */
118};
119
120struct iscsi_conn {
121 struct iscsi_cls_conn *cls_conn; /* ptr to class connection */
122 void *dd_data; /* iscsi_transport data */
123 struct iscsi_session *session; /* parent session */
124 /*
125 * LLDs should set this lock. It protects the transport recv
126 * code
127 */
128 rwlock_t *recv_lock;
129 /*
130 * conn_stop() flag: stop to recover, stop to terminate
131 */
132 int stop_stage;
133
134 /* iSCSI connection-wide sequencing */
135 uint32_t exp_statsn;
136
137 /* control data */
138 int id; /* CID */
139 struct list_head item; /* maintains list of conns */
140 int c_stage; /* connection state */
141 /*
142 * Preallocated buffer for pdus that have data but do not
143 * originate from scsi-ml. We never have two pdus using the
144 * buffer at the same time. It is only allocated to
145 * the default max recv size because the pdus we support
146 * should always fit in this buffer
147 */
148 char *data;
149 struct iscsi_mgmt_task *login_mtask; /* mtask used for login/text */
150 struct iscsi_mgmt_task *mtask; /* xmit mtask in progress */
151 struct iscsi_cmd_task *ctask; /* xmit ctask in progress */
152
153 /* xmit */
154 struct kfifo *immqueue; /* immediate xmit queue */
155 struct kfifo *mgmtqueue; /* mgmt (control) xmit queue */
156 struct list_head mgmt_run_list; /* list of control tasks */
157 struct list_head xmitqueue; /* data-path cmd queue */
158 struct list_head run_list; /* list of cmds in progress */
159 struct work_struct xmitwork; /* per-conn. xmit workqueue */
160 /*
161 * serializes connection xmit, access to kfifos:
162 * xmitqueue, immqueue, mgmtqueue
163 */
164 struct mutex xmitmutex;
165
166 unsigned long suspend_tx; /* suspend Tx */
167 unsigned long suspend_rx; /* suspend Rx */
168
169 /* abort */
170 wait_queue_head_t ehwait; /* used in eh_abort() */
171 struct iscsi_tm tmhdr;
172 struct timer_list tmabort_timer;
173 int tmabort_state; /* see TMABORT_INITIAL, etc.*/
174
175 /* negotiated params */
176 int max_recv_dlength; /* initiator_max_recv_dsl*/
177 int max_xmit_dlength; /* target_max_recv_dsl */
178 int hdrdgst_en;
179 int datadgst_en;
180 int ifmarker_en;
181 int ofmarker_en;
182 /* values userspace uses to id a conn */
183 int persistent_port;
184 char *persistent_address;
185
186 /* MIB-statistics */
187 uint64_t txdata_octets;
188 uint64_t rxdata_octets;
189 uint32_t scsicmd_pdus_cnt;
190 uint32_t dataout_pdus_cnt;
191 uint32_t scsirsp_pdus_cnt;
192 uint32_t datain_pdus_cnt;
193 uint32_t r2t_pdus_cnt;
194 uint32_t tmfcmd_pdus_cnt;
195 int32_t tmfrsp_pdus_cnt;
196
197 /* custom statistics */
198 uint32_t eh_abort_cnt;
199};
200
201struct iscsi_queue {
202 struct kfifo *queue; /* FIFO Queue */
203 void **pool; /* Pool of elements */
204 int max; /* Max number of elements */
205};
206
207struct iscsi_session {
208 /* iSCSI session-wide sequencing */
209 uint32_t cmdsn;
210 uint32_t exp_cmdsn;
211 uint32_t max_cmdsn;
212
213 /* configuration */
214 int initial_r2t_en;
215 int max_r2t;
216 int imm_data_en;
217 int first_burst;
218 int max_burst;
219 int time2wait;
220 int time2retain;
221 int pdu_inorder_en;
222 int dataseq_inorder_en;
223 int erl;
224 int tpgt;
225 char *targetname;
226
227 /* control data */
228 struct iscsi_transport *tt;
229 struct Scsi_Host *host;
230 struct iscsi_conn *leadconn; /* leading connection */
231 spinlock_t lock; /* protects session state, *
232 * sequence numbers, *
233 * session resources: *
234 * - cmdpool, *
235 * - mgmtpool, *
236 * - r2tpool */
237 int state; /* session state */
238 struct list_head item;
239 int age; /* counts session re-opens */
240
241 struct list_head connections; /* list of connections */
242 int cmds_max; /* size of cmds array */
243 struct iscsi_cmd_task **cmds; /* Original Cmds arr */
244 struct iscsi_queue cmdpool; /* PDU's pool */
245 int mgmtpool_max; /* size of mgmt array */
246 struct iscsi_mgmt_task **mgmt_cmds; /* Original mgmt arr */
247 struct iscsi_queue mgmtpool; /* Mgmt PDU's pool */
248};
249
250/*
251 * scsi host template
252 */
253extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth);
254extern int iscsi_eh_abort(struct scsi_cmnd *sc);
255extern int iscsi_eh_host_reset(struct scsi_cmnd *sc);
256extern int iscsi_queuecommand(struct scsi_cmnd *sc,
257 void (*done)(struct scsi_cmnd *));
258
259/*
260 * session management
261 */
262extern struct iscsi_cls_session *
263iscsi_session_setup(struct iscsi_transport *, struct scsi_transport_template *,
264 int, int, uint32_t, uint32_t *);
265extern void iscsi_session_teardown(struct iscsi_cls_session *);
266extern struct iscsi_session *class_to_transport_session(struct iscsi_cls_session *);
267extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
268extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
269 enum iscsi_param param, char *buf, int buflen);
270extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
271 enum iscsi_param param, char *buf);
272
273#define session_to_cls(_sess) \
274 hostdata_session(_sess->host->hostdata)
275
276/*
277 * connection management
278 */
279extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *,
280 uint32_t);
281extern void iscsi_conn_teardown(struct iscsi_cls_conn *);
282extern int iscsi_conn_start(struct iscsi_cls_conn *);
283extern void iscsi_conn_stop(struct iscsi_cls_conn *, int);
284extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *,
285 int);
286extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err);
287extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
288 enum iscsi_param param, char *buf);
289
290/*
291 * pdu and task processing
292 */
293extern int iscsi_check_assign_cmdsn(struct iscsi_session *,
294 struct iscsi_nopin *);
295extern void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *,
296 struct iscsi_data *hdr);
297extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *,
298 char *, uint32_t);
299extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
300 char *, int);
301extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
302 char *, int);
303extern int iscsi_verify_itt(struct iscsi_conn *, struct iscsi_hdr *,
304 uint32_t *);
305
306/*
307 * generic helpers
308 */
309extern void iscsi_pool_free(struct iscsi_queue *, void **);
310extern int iscsi_pool_init(struct iscsi_queue *, int, void ***, int);
311
312#endif