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7996a778 MC |
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> | |
40753caa | 27 | #include <linux/wait.h> |
7996a778 | 28 | #include <linux/mutex.h> |
f6a57033 AV |
29 | #include <linux/timer.h> |
30 | #include <linux/workqueue.h> | |
7996a778 MC |
31 | #include <scsi/iscsi_proto.h> |
32 | #include <scsi/iscsi_if.h> | |
33 | ||
34 | struct scsi_transport_template; | |
a4804cd6 | 35 | struct scsi_host_template; |
7996a778 MC |
36 | struct scsi_device; |
37 | struct Scsi_Host; | |
38 | struct scsi_cmnd; | |
39 | struct socket; | |
40 | struct iscsi_transport; | |
41 | struct iscsi_cls_session; | |
42 | struct iscsi_cls_conn; | |
43 | struct iscsi_session; | |
44 | struct iscsi_nopin; | |
a4804cd6 | 45 | struct device; |
7996a778 MC |
46 | |
47 | /* #define DEBUG_SCSI */ | |
48 | #ifdef DEBUG_SCSI | |
be2df72e | 49 | #define debug_scsi(fmt...) printk(KERN_INFO "iscsi: " fmt) |
7996a778 MC |
50 | #else |
51 | #define debug_scsi(fmt...) | |
52 | #endif | |
53 | ||
1548271e MC |
54 | #define ISCSI_DEF_XMIT_CMDS_MAX 128 /* must be power of 2 */ |
55 | #define ISCSI_MGMT_CMDS_MAX 16 /* must be power of 2 */ | |
7996a778 MC |
56 | |
57 | #define ISCSI_MGMT_ITT_OFFSET 0xa00 | |
58 | ||
59 | #define ISCSI_DEF_CMD_PER_LUN 32 | |
60 | #define ISCSI_MAX_CMD_PER_LUN 128 | |
61 | ||
62 | /* Task Mgmt states */ | |
843c0a8a MC |
63 | enum { |
64 | TMF_INITIAL, | |
65 | TMF_QUEUED, | |
66 | TMF_SUCCESS, | |
67 | TMF_FAILED, | |
68 | TMF_TIMEDOUT, | |
69 | TMF_NOT_FOUND, | |
70 | }; | |
7996a778 MC |
71 | |
72 | /* Connection suspend "bit" */ | |
73 | #define ISCSI_SUSPEND_BIT 1 | |
74 | ||
75 | #define ISCSI_ITT_MASK (0xfff) | |
7996a778 MC |
76 | #define ISCSI_AGE_SHIFT 28 |
77 | #define ISCSI_AGE_MASK (0xf << ISCSI_AGE_SHIFT) | |
78 | ||
22236961 MC |
79 | #define ISCSI_ADDRESS_BUF_LEN 64 |
80 | ||
da32dd68 | 81 | enum { |
004d6530 BH |
82 | /* this is the maximum possible storage for AHSs */ |
83 | ISCSI_MAX_AHS_SIZE = sizeof(struct iscsi_ecdb_ahdr) + | |
84 | sizeof(struct iscsi_rlength_ahdr), | |
da32dd68 OK |
85 | ISCSI_DIGEST_SIZE = sizeof(__u32), |
86 | }; | |
87 | ||
7996a778 MC |
88 | struct iscsi_mgmt_task { |
89 | /* | |
90 | * Becuae LLDs allocate their hdr differently, this is a pointer to | |
91 | * that storage. It must be setup at session creation time. | |
92 | */ | |
93 | struct iscsi_hdr *hdr; | |
94 | char *data; /* mgmt payload */ | |
857ae0bd | 95 | unsigned data_count; /* counts data to be sent */ |
7996a778 MC |
96 | uint32_t itt; /* this ITT */ |
97 | void *dd_data; /* driver/transport data */ | |
98 | struct list_head running; | |
99 | }; | |
100 | ||
b6c395ed MC |
101 | enum { |
102 | ISCSI_TASK_COMPLETED, | |
103 | ISCSI_TASK_PENDING, | |
104 | ISCSI_TASK_RUNNING, | |
105 | }; | |
106 | ||
7996a778 MC |
107 | struct iscsi_cmd_task { |
108 | /* | |
004d6530 BH |
109 | * Because LLDs allocate their hdr differently, this is a pointer |
110 | * and length to that storage. It must be setup at session | |
111 | * creation time. | |
7996a778 MC |
112 | */ |
113 | struct iscsi_cmd *hdr; | |
004d6530 BH |
114 | unsigned short hdr_max; |
115 | unsigned short hdr_len; /* accumulated size of hdr used */ | |
7996a778 | 116 | int itt; /* this ITT */ |
7996a778 MC |
117 | |
118 | uint32_t unsol_datasn; | |
857ae0bd MC |
119 | unsigned imm_count; /* imm-data (bytes) */ |
120 | unsigned unsol_count; /* unsolicited (bytes)*/ | |
ffd0436e | 121 | /* offset in unsolicited stream (bytes); */ |
857ae0bd MC |
122 | unsigned unsol_offset; |
123 | unsigned data_count; /* remaining Data-Out */ | |
7996a778 | 124 | struct scsi_cmnd *sc; /* associated SCSI cmd*/ |
7996a778 | 125 | struct iscsi_conn *conn; /* used connection */ |
7996a778 | 126 | |
b6c395ed MC |
127 | /* state set/tested under session->lock */ |
128 | int state; | |
60ecebf5 | 129 | atomic_t refcount; |
7996a778 MC |
130 | struct list_head running; /* running cmd list */ |
131 | void *dd_data; /* driver/transport data */ | |
132 | }; | |
133 | ||
004d6530 BH |
134 | static inline void* iscsi_next_hdr(struct iscsi_cmd_task *ctask) |
135 | { | |
136 | return (void*)ctask->hdr + ctask->hdr_len; | |
137 | } | |
138 | ||
6eabafbe MC |
139 | /* Connection's states */ |
140 | enum { | |
141 | ISCSI_CONN_INITIAL_STAGE, | |
142 | ISCSI_CONN_STARTED, | |
143 | ISCSI_CONN_STOPPED, | |
144 | ISCSI_CONN_CLEANUP_WAIT, | |
145 | }; | |
146 | ||
7996a778 MC |
147 | struct iscsi_conn { |
148 | struct iscsi_cls_conn *cls_conn; /* ptr to class connection */ | |
149 | void *dd_data; /* iscsi_transport data */ | |
150 | struct iscsi_session *session; /* parent session */ | |
151 | /* | |
152 | * LLDs should set this lock. It protects the transport recv | |
153 | * code | |
154 | */ | |
155 | rwlock_t *recv_lock; | |
156 | /* | |
157 | * conn_stop() flag: stop to recover, stop to terminate | |
158 | */ | |
159 | int stop_stage; | |
f6d5180c MC |
160 | struct timer_list transport_timer; |
161 | unsigned long last_recv; | |
162 | unsigned long last_ping; | |
163 | int ping_timeout; | |
164 | int recv_timeout; | |
165 | struct iscsi_mgmt_task *ping_mtask; | |
7996a778 MC |
166 | |
167 | /* iSCSI connection-wide sequencing */ | |
168 | uint32_t exp_statsn; | |
169 | ||
170 | /* control data */ | |
171 | int id; /* CID */ | |
7996a778 | 172 | int c_stage; /* connection state */ |
c8dc1e52 MC |
173 | /* |
174 | * Preallocated buffer for pdus that have data but do not | |
175 | * originate from scsi-ml. We never have two pdus using the | |
176 | * buffer at the same time. It is only allocated to | |
177 | * the default max recv size because the pdus we support | |
178 | * should always fit in this buffer | |
179 | */ | |
180 | char *data; | |
7996a778 MC |
181 | struct iscsi_mgmt_task *login_mtask; /* mtask used for login/text */ |
182 | struct iscsi_mgmt_task *mtask; /* xmit mtask in progress */ | |
183 | struct iscsi_cmd_task *ctask; /* xmit ctask in progress */ | |
184 | ||
185 | /* xmit */ | |
843c0a8a | 186 | struct list_head mgmtqueue; /* mgmt (control) xmit queue */ |
7996a778 | 187 | struct list_head mgmt_run_list; /* list of control tasks */ |
b6c395ed | 188 | struct list_head xmitqueue; /* data-path cmd queue */ |
7996a778 | 189 | struct list_head run_list; /* list of cmds in progress */ |
843c0a8a | 190 | struct list_head requeue; /* tasks needing another run */ |
7996a778 | 191 | struct work_struct xmitwork; /* per-conn. xmit workqueue */ |
7996a778 MC |
192 | unsigned long suspend_tx; /* suspend Tx */ |
193 | unsigned long suspend_rx; /* suspend Rx */ | |
194 | ||
195 | /* abort */ | |
196 | wait_queue_head_t ehwait; /* used in eh_abort() */ | |
197 | struct iscsi_tm tmhdr; | |
843c0a8a MC |
198 | struct timer_list tmf_timer; |
199 | int tmf_state; /* see TMF_INITIAL, etc.*/ | |
7996a778 MC |
200 | |
201 | /* negotiated params */ | |
857ae0bd MC |
202 | unsigned max_recv_dlength; /* initiator_max_recv_dsl*/ |
203 | unsigned max_xmit_dlength; /* target_max_recv_dsl */ | |
7996a778 MC |
204 | int hdrdgst_en; |
205 | int datadgst_en; | |
a54a52ca MC |
206 | int ifmarker_en; |
207 | int ofmarker_en; | |
208 | /* values userspace uses to id a conn */ | |
209 | int persistent_port; | |
210 | char *persistent_address; | |
22236961 MC |
211 | /* remote portal currently connected to */ |
212 | int portal_port; | |
213 | char portal_address[ISCSI_ADDRESS_BUF_LEN]; | |
7996a778 MC |
214 | |
215 | /* MIB-statistics */ | |
216 | uint64_t txdata_octets; | |
217 | uint64_t rxdata_octets; | |
218 | uint32_t scsicmd_pdus_cnt; | |
219 | uint32_t dataout_pdus_cnt; | |
220 | uint32_t scsirsp_pdus_cnt; | |
221 | uint32_t datain_pdus_cnt; | |
222 | uint32_t r2t_pdus_cnt; | |
223 | uint32_t tmfcmd_pdus_cnt; | |
224 | int32_t tmfrsp_pdus_cnt; | |
225 | ||
226 | /* custom statistics */ | |
227 | uint32_t eh_abort_cnt; | |
87528227 | 228 | uint32_t fmr_unalign_cnt; |
7996a778 MC |
229 | }; |
230 | ||
6320377f | 231 | struct iscsi_pool { |
7996a778 MC |
232 | struct kfifo *queue; /* FIFO Queue */ |
233 | void **pool; /* Pool of elements */ | |
234 | int max; /* Max number of elements */ | |
235 | }; | |
236 | ||
6eabafbe MC |
237 | /* Session's states */ |
238 | enum { | |
239 | ISCSI_STATE_FREE = 1, | |
240 | ISCSI_STATE_LOGGED_IN, | |
241 | ISCSI_STATE_FAILED, | |
242 | ISCSI_STATE_TERMINATE, | |
243 | ISCSI_STATE_IN_RECOVERY, | |
244 | ISCSI_STATE_RECOVERY_FAILED, | |
245 | ISCSI_STATE_LOGGING_OUT, | |
246 | }; | |
247 | ||
7996a778 | 248 | struct iscsi_session { |
75613521 | 249 | struct iscsi_cls_session *cls_session; |
6724add1 MC |
250 | /* |
251 | * Syncs up the scsi eh thread with the iscsi eh thread when sending | |
252 | * task management functions. This must be taken before the session | |
253 | * and recv lock. | |
254 | */ | |
255 | struct mutex eh_mutex; | |
256 | ||
7996a778 MC |
257 | /* iSCSI session-wide sequencing */ |
258 | uint32_t cmdsn; | |
259 | uint32_t exp_cmdsn; | |
260 | uint32_t max_cmdsn; | |
261 | ||
e0726407 MC |
262 | /* This tracks the reqs queued into the initiator */ |
263 | uint32_t queued_cmdsn; | |
264 | ||
7996a778 | 265 | /* configuration */ |
f6d5180c MC |
266 | int abort_timeout; |
267 | int lu_reset_timeout; | |
7996a778 | 268 | int initial_r2t_en; |
857ae0bd | 269 | unsigned max_r2t; |
7996a778 | 270 | int imm_data_en; |
857ae0bd MC |
271 | unsigned first_burst; |
272 | unsigned max_burst; | |
7996a778 MC |
273 | int time2wait; |
274 | int time2retain; | |
275 | int pdu_inorder_en; | |
276 | int dataseq_inorder_en; | |
277 | int erl; | |
843c0a8a | 278 | int fast_abort; |
a54a52ca | 279 | int tpgt; |
b2c64167 MC |
280 | char *username; |
281 | char *username_in; | |
282 | char *password; | |
283 | char *password_in; | |
a54a52ca | 284 | char *targetname; |
7996a778 MC |
285 | /* control data */ |
286 | struct iscsi_transport *tt; | |
287 | struct Scsi_Host *host; | |
288 | struct iscsi_conn *leadconn; /* leading connection */ | |
289 | spinlock_t lock; /* protects session state, * | |
290 | * sequence numbers, * | |
291 | * session resources: * | |
292 | * - cmdpool, * | |
293 | * - mgmtpool, * | |
294 | * - r2tpool */ | |
295 | int state; /* session state */ | |
7996a778 MC |
296 | int age; /* counts session re-opens */ |
297 | ||
7996a778 MC |
298 | int cmds_max; /* size of cmds array */ |
299 | struct iscsi_cmd_task **cmds; /* Original Cmds arr */ | |
6320377f | 300 | struct iscsi_pool cmdpool; /* PDU's pool */ |
7996a778 MC |
301 | int mgmtpool_max; /* size of mgmt array */ |
302 | struct iscsi_mgmt_task **mgmt_cmds; /* Original mgmt arr */ | |
6320377f | 303 | struct iscsi_pool mgmtpool; /* Mgmt PDU's pool */ |
7996a778 MC |
304 | }; |
305 | ||
75613521 MC |
306 | struct iscsi_host { |
307 | char *initiatorname; | |
308 | /* hw address or netdev iscsi connection is bound to */ | |
309 | char *hwaddress; | |
310 | char *netdev; | |
311 | /* local address */ | |
312 | int local_port; | |
313 | char local_address[ISCSI_ADDRESS_BUF_LEN]; | |
314 | }; | |
315 | ||
7996a778 MC |
316 | /* |
317 | * scsi host template | |
318 | */ | |
319 | extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth); | |
320 | extern int iscsi_eh_abort(struct scsi_cmnd *sc); | |
321 | extern int iscsi_eh_host_reset(struct scsi_cmnd *sc); | |
843c0a8a | 322 | extern int iscsi_eh_device_reset(struct scsi_cmnd *sc); |
7996a778 MC |
323 | extern int iscsi_queuecommand(struct scsi_cmnd *sc, |
324 | void (*done)(struct scsi_cmnd *)); | |
0801c242 | 325 | |
0801c242 MC |
326 | /* |
327 | * iSCSI host helpers. | |
328 | */ | |
5d91e209 MC |
329 | #define iscsi_host_priv(_shost) \ |
330 | (shost_priv(_shost) + sizeof(struct iscsi_host)) | |
331 | ||
0801c242 MC |
332 | extern int iscsi_host_set_param(struct Scsi_Host *shost, |
333 | enum iscsi_host_param param, char *buf, | |
334 | int buflen); | |
335 | extern int iscsi_host_get_param(struct Scsi_Host *shost, | |
336 | enum iscsi_host_param param, char *buf); | |
a4804cd6 MC |
337 | extern int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev); |
338 | extern struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
339 | int dd_data_size, uint16_t qdepth); | |
340 | extern void iscsi_host_remove(struct Scsi_Host *shost); | |
341 | extern void iscsi_host_free(struct Scsi_Host *shost); | |
7996a778 MC |
342 | |
343 | /* | |
344 | * session management | |
345 | */ | |
346 | extern struct iscsi_cls_session * | |
75613521 MC |
347 | iscsi_session_setup(struct iscsi_transport *, struct Scsi_Host *shost, |
348 | uint16_t, int, int, uint32_t); | |
7996a778 | 349 | extern void iscsi_session_teardown(struct iscsi_cls_session *); |
7996a778 | 350 | extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *); |
a54a52ca MC |
351 | extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn, |
352 | enum iscsi_param param, char *buf, int buflen); | |
353 | extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
354 | enum iscsi_param param, char *buf); | |
7996a778 | 355 | |
322d739d | 356 | #define iscsi_session_printk(prefix, _sess, fmt, a...) \ |
75613521 | 357 | iscsi_cls_session_printk(prefix, _sess->cls_session, fmt, ##a) |
322d739d | 358 | |
7996a778 MC |
359 | /* |
360 | * connection management | |
361 | */ | |
362 | extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *, | |
5d91e209 | 363 | int, uint32_t); |
7996a778 MC |
364 | extern void iscsi_conn_teardown(struct iscsi_cls_conn *); |
365 | extern int iscsi_conn_start(struct iscsi_cls_conn *); | |
366 | extern void iscsi_conn_stop(struct iscsi_cls_conn *, int); | |
367 | extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *, | |
368 | int); | |
369 | extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err); | |
a54a52ca MC |
370 | extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, |
371 | enum iscsi_param param, char *buf); | |
5af3e91d | 372 | extern void iscsi_suspend_tx(struct iscsi_conn *conn); |
7996a778 | 373 | |
322d739d | 374 | #define iscsi_conn_printk(prefix, _c, fmt, a...) \ |
5af3e91d MC |
375 | iscsi_cls_conn_printk(prefix, ((struct iscsi_conn *)_c)->cls_conn, \ |
376 | fmt, ##a) | |
322d739d | 377 | |
7996a778 MC |
378 | /* |
379 | * pdu and task processing | |
380 | */ | |
77a23c21 | 381 | extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *); |
7996a778 | 382 | extern void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *, |
ffd0436e | 383 | struct iscsi_data *hdr); |
7996a778 MC |
384 | extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *, |
385 | char *, uint32_t); | |
386 | extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *, | |
387 | char *, int); | |
0af967f5 MC |
388 | extern int iscsi_verify_itt(struct iscsi_conn *, itt_t); |
389 | extern struct iscsi_cmd_task *iscsi_itt_to_ctask(struct iscsi_conn *, itt_t); | |
843c0a8a | 390 | extern void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask); |
b3a7ea8d MC |
391 | extern void iscsi_free_mgmt_task(struct iscsi_conn *conn, |
392 | struct iscsi_mgmt_task *mtask); | |
7996a778 MC |
393 | |
394 | /* | |
395 | * generic helpers | |
396 | */ | |
6320377f OK |
397 | extern void iscsi_pool_free(struct iscsi_pool *); |
398 | extern int iscsi_pool_init(struct iscsi_pool *, int, void ***, int); | |
7996a778 | 399 | |
004d6530 BH |
400 | /* |
401 | * inline functions to deal with padding. | |
402 | */ | |
403 | static inline unsigned int | |
404 | iscsi_padded(unsigned int len) | |
405 | { | |
406 | return (len + ISCSI_PAD_LEN - 1) & ~(ISCSI_PAD_LEN - 1); | |
407 | } | |
408 | ||
409 | static inline unsigned int | |
410 | iscsi_padding(unsigned int len) | |
411 | { | |
412 | len &= (ISCSI_PAD_LEN - 1); | |
413 | if (len) | |
414 | len = ISCSI_PAD_LEN - len; | |
415 | return len; | |
416 | } | |
417 | ||
7996a778 | 418 | #endif |