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1a59d1b8 | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
7996a778 MC |
2 | /* |
3 | * iSCSI lib definitions | |
4 | * | |
5 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
6 | * Copyright (C) 2004 - 2006 Mike Christie | |
7 | * Copyright (C) 2004 - 2005 Dmitry Yusupov | |
8 | * Copyright (C) 2004 - 2005 Alex Aizman | |
7996a778 MC |
9 | */ |
10 | #ifndef LIBISCSI_H | |
11 | #define LIBISCSI_H | |
12 | ||
13 | #include <linux/types.h> | |
40753caa | 14 | #include <linux/wait.h> |
7996a778 | 15 | #include <linux/mutex.h> |
f6a57033 AV |
16 | #include <linux/timer.h> |
17 | #include <linux/workqueue.h> | |
45465487 | 18 | #include <linux/kfifo.h> |
6dc618cd | 19 | #include <linux/refcount.h> |
7996a778 MC |
20 | #include <scsi/iscsi_proto.h> |
21 | #include <scsi/iscsi_if.h> | |
262ef636 | 22 | #include <scsi/scsi_transport_iscsi.h> |
7996a778 MC |
23 | |
24 | struct scsi_transport_template; | |
a4804cd6 | 25 | struct scsi_host_template; |
7996a778 MC |
26 | struct scsi_device; |
27 | struct Scsi_Host; | |
6b5d6c44 | 28 | struct scsi_target; |
7996a778 MC |
29 | struct scsi_cmnd; |
30 | struct socket; | |
31 | struct iscsi_transport; | |
32 | struct iscsi_cls_session; | |
33 | struct iscsi_cls_conn; | |
34 | struct iscsi_session; | |
35 | struct iscsi_nopin; | |
a4804cd6 | 36 | struct device; |
7996a778 | 37 | |
1548271e | 38 | #define ISCSI_DEF_XMIT_CMDS_MAX 128 /* must be power of 2 */ |
3cf7b233 | 39 | #define ISCSI_MGMT_CMDS_MAX 15 |
7996a778 | 40 | |
e28f3d5b | 41 | #define ISCSI_DEF_CMD_PER_LUN 32 |
7996a778 MC |
42 | |
43 | /* Task Mgmt states */ | |
843c0a8a MC |
44 | enum { |
45 | TMF_INITIAL, | |
46 | TMF_QUEUED, | |
47 | TMF_SUCCESS, | |
48 | TMF_FAILED, | |
49 | TMF_TIMEDOUT, | |
50 | TMF_NOT_FOUND, | |
51 | }; | |
7996a778 | 52 | |
f8525eb4 AC |
53 | #define ISID_SIZE 6 |
54 | ||
7996a778 MC |
55 | /* Connection suspend "bit" */ |
56 | #define ISCSI_SUSPEND_BIT 1 | |
57 | ||
262ef636 | 58 | #define ISCSI_ITT_MASK 0x1fff |
3cf7b233 MC |
59 | #define ISCSI_TOTAL_CMDS_MAX 4096 |
60 | /* this must be a power of two greater than ISCSI_MGMT_CMDS_MAX */ | |
61 | #define ISCSI_TOTAL_CMDS_MIN 16 | |
7996a778 | 62 | #define ISCSI_AGE_SHIFT 28 |
262ef636 | 63 | #define ISCSI_AGE_MASK 0xf |
7996a778 | 64 | |
22236961 MC |
65 | #define ISCSI_ADDRESS_BUF_LEN 64 |
66 | ||
da32dd68 | 67 | enum { |
004d6530 BH |
68 | /* this is the maximum possible storage for AHSs */ |
69 | ISCSI_MAX_AHS_SIZE = sizeof(struct iscsi_ecdb_ahdr) + | |
70 | sizeof(struct iscsi_rlength_ahdr), | |
da32dd68 OK |
71 | ISCSI_DIGEST_SIZE = sizeof(__u32), |
72 | }; | |
73 | ||
7996a778 | 74 | |
b6c395ed | 75 | enum { |
3bbaaad9 | 76 | ISCSI_TASK_FREE, |
b6c395ed MC |
77 | ISCSI_TASK_COMPLETED, |
78 | ISCSI_TASK_PENDING, | |
79 | ISCSI_TASK_RUNNING, | |
b3cd5050 MC |
80 | ISCSI_TASK_ABRT_TMF, /* aborted due to TMF */ |
81 | ISCSI_TASK_ABRT_SESS_RECOV, /* aborted due to session recovery */ | |
f41d4721 | 82 | ISCSI_TASK_REQUEUE_SCSIQ, /* qcmd requeueing to scsi-ml */ |
b6c395ed MC |
83 | }; |
84 | ||
577577da MC |
85 | struct iscsi_r2t_info { |
86 | __be32 ttt; /* copied from R2T */ | |
87 | __be32 exp_statsn; /* copied from R2T */ | |
88 | uint32_t data_length; /* copied from R2T */ | |
89 | uint32_t data_offset; /* copied from R2T */ | |
90 | int data_count; /* DATA-Out payload progress */ | |
91 | int datasn; | |
92 | /* LLDs should set/update these values */ | |
93 | int sent; /* R2T sequence progress */ | |
94 | }; | |
95 | ||
9c19a7d0 | 96 | struct iscsi_task { |
7996a778 | 97 | /* |
004d6530 BH |
98 | * Because LLDs allocate their hdr differently, this is a pointer |
99 | * and length to that storage. It must be setup at session | |
100 | * creation time. | |
7996a778 | 101 | */ |
577577da | 102 | struct iscsi_hdr *hdr; |
004d6530 BH |
103 | unsigned short hdr_max; |
104 | unsigned short hdr_len; /* accumulated size of hdr used */ | |
577577da MC |
105 | /* copied values in case we need to send tmfs */ |
106 | itt_t hdr_itt; | |
107 | __be32 cmdsn; | |
516f43a2 | 108 | struct scsi_lun lun; |
577577da | 109 | |
7996a778 | 110 | int itt; /* this ITT */ |
7996a778 | 111 | |
857ae0bd | 112 | unsigned imm_count; /* imm-data (bytes) */ |
ffd0436e | 113 | /* offset in unsolicited stream (bytes); */ |
577577da | 114 | struct iscsi_r2t_info unsol_r2t; |
3e5c28ad | 115 | char *data; /* mgmt payload */ |
577577da | 116 | unsigned data_count; |
7996a778 | 117 | struct scsi_cmnd *sc; /* associated SCSI cmd*/ |
7996a778 | 118 | struct iscsi_conn *conn; /* used connection */ |
7996a778 | 119 | |
d355e57d MC |
120 | /* data processing tracking */ |
121 | unsigned long last_xfer; | |
122 | unsigned long last_timeout; | |
123 | bool have_checked_conn; | |
55e51eda SG |
124 | |
125 | /* T10 protection information */ | |
126 | bool protected; | |
127 | ||
b6c395ed MC |
128 | /* state set/tested under session->lock */ |
129 | int state; | |
6dc618cd | 130 | refcount_t refcount; |
7996a778 MC |
131 | struct list_head running; /* running cmd list */ |
132 | void *dd_data; /* driver/transport data */ | |
133 | }; | |
134 | ||
577577da MC |
135 | static inline int iscsi_task_has_unsol_data(struct iscsi_task *task) |
136 | { | |
137 | return task->unsol_r2t.data_length > task->unsol_r2t.sent; | |
138 | } | |
139 | ||
9c19a7d0 | 140 | static inline void* iscsi_next_hdr(struct iscsi_task *task) |
004d6530 | 141 | { |
9c19a7d0 | 142 | return (void*)task->hdr + task->hdr_len; |
004d6530 BH |
143 | } |
144 | ||
6eabafbe MC |
145 | /* Connection's states */ |
146 | enum { | |
147 | ISCSI_CONN_INITIAL_STAGE, | |
148 | ISCSI_CONN_STARTED, | |
149 | ISCSI_CONN_STOPPED, | |
150 | ISCSI_CONN_CLEANUP_WAIT, | |
151 | }; | |
152 | ||
7996a778 MC |
153 | struct iscsi_conn { |
154 | struct iscsi_cls_conn *cls_conn; /* ptr to class connection */ | |
155 | void *dd_data; /* iscsi_transport data */ | |
156 | struct iscsi_session *session; /* parent session */ | |
7996a778 MC |
157 | /* |
158 | * conn_stop() flag: stop to recover, stop to terminate | |
159 | */ | |
160 | int stop_stage; | |
f6d5180c MC |
161 | struct timer_list transport_timer; |
162 | unsigned long last_recv; | |
163 | unsigned long last_ping; | |
164 | int ping_timeout; | |
165 | int recv_timeout; | |
9c19a7d0 | 166 | struct iscsi_task *ping_task; |
7996a778 MC |
167 | |
168 | /* iSCSI connection-wide sequencing */ | |
169 | uint32_t exp_statsn; | |
f8525eb4 | 170 | uint32_t statsn; |
7996a778 MC |
171 | |
172 | /* control data */ | |
173 | int id; /* CID */ | |
7996a778 | 174 | int c_stage; /* connection state */ |
c8dc1e52 MC |
175 | /* |
176 | * Preallocated buffer for pdus that have data but do not | |
177 | * originate from scsi-ml. We never have two pdus using the | |
178 | * buffer at the same time. It is only allocated to | |
179 | * the default max recv size because the pdus we support | |
180 | * should always fit in this buffer | |
181 | */ | |
182 | char *data; | |
9c19a7d0 MC |
183 | struct iscsi_task *login_task; /* mtask used for login/text */ |
184 | struct iscsi_task *task; /* xmit task in progress */ | |
7996a778 MC |
185 | |
186 | /* xmit */ | |
6f8830f5 | 187 | spinlock_t taskqueuelock; /* protects the next three lists */ |
843c0a8a | 188 | struct list_head mgmtqueue; /* mgmt (control) xmit queue */ |
3bbaaad9 | 189 | struct list_head cmdqueue; /* data-path cmd queue */ |
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; | |
7996a778 | 211 | |
f8525eb4 AC |
212 | unsigned max_segment_size; |
213 | unsigned tcp_xmit_wsf; | |
214 | unsigned tcp_recv_wsf; | |
215 | uint16_t keepalive_tmo; | |
216 | uint16_t local_port; | |
217 | uint8_t tcp_timestamp_stat; | |
218 | uint8_t tcp_nagle_disable; | |
219 | uint8_t tcp_wsf_disable; | |
220 | uint8_t tcp_timer_scale; | |
221 | uint8_t tcp_timestamp_en; | |
222 | uint8_t fragment_disable; | |
223 | uint8_t ipv4_tos; | |
224 | uint8_t ipv6_traffic_class; | |
225 | uint8_t ipv6_flow_label; | |
226 | uint8_t is_fw_assigned_ipv6; | |
ae56ff40 | 227 | char *local_ipaddr; |
f8525eb4 | 228 | |
7996a778 MC |
229 | /* MIB-statistics */ |
230 | uint64_t txdata_octets; | |
231 | uint64_t rxdata_octets; | |
232 | uint32_t scsicmd_pdus_cnt; | |
233 | uint32_t dataout_pdus_cnt; | |
234 | uint32_t scsirsp_pdus_cnt; | |
235 | uint32_t datain_pdus_cnt; | |
236 | uint32_t r2t_pdus_cnt; | |
237 | uint32_t tmfcmd_pdus_cnt; | |
238 | int32_t tmfrsp_pdus_cnt; | |
239 | ||
240 | /* custom statistics */ | |
241 | uint32_t eh_abort_cnt; | |
87528227 | 242 | uint32_t fmr_unalign_cnt; |
7996a778 MC |
243 | }; |
244 | ||
6320377f | 245 | struct iscsi_pool { |
45465487 | 246 | struct kfifo queue; /* FIFO Queue */ |
7996a778 MC |
247 | void **pool; /* Pool of elements */ |
248 | int max; /* Max number of elements */ | |
249 | }; | |
250 | ||
6eabafbe MC |
251 | /* Session's states */ |
252 | enum { | |
253 | ISCSI_STATE_FREE = 1, | |
254 | ISCSI_STATE_LOGGED_IN, | |
255 | ISCSI_STATE_FAILED, | |
256 | ISCSI_STATE_TERMINATE, | |
257 | ISCSI_STATE_IN_RECOVERY, | |
258 | ISCSI_STATE_RECOVERY_FAILED, | |
259 | ISCSI_STATE_LOGGING_OUT, | |
260 | }; | |
261 | ||
7996a778 | 262 | struct iscsi_session { |
75613521 | 263 | struct iscsi_cls_session *cls_session; |
6724add1 MC |
264 | /* |
265 | * Syncs up the scsi eh thread with the iscsi eh thread when sending | |
266 | * task management functions. This must be taken before the session | |
267 | * and recv lock. | |
268 | */ | |
269 | struct mutex eh_mutex; | |
270 | ||
7996a778 MC |
271 | /* iSCSI session-wide sequencing */ |
272 | uint32_t cmdsn; | |
273 | uint32_t exp_cmdsn; | |
274 | uint32_t max_cmdsn; | |
275 | ||
e0726407 MC |
276 | /* This tracks the reqs queued into the initiator */ |
277 | uint32_t queued_cmdsn; | |
278 | ||
7996a778 | 279 | /* configuration */ |
f6d5180c MC |
280 | int abort_timeout; |
281 | int lu_reset_timeout; | |
3fe5ae8b | 282 | int tgt_reset_timeout; |
7996a778 | 283 | int initial_r2t_en; |
1304be5f | 284 | unsigned short max_r2t; |
7996a778 | 285 | int imm_data_en; |
857ae0bd MC |
286 | unsigned first_burst; |
287 | unsigned max_burst; | |
7996a778 MC |
288 | int time2wait; |
289 | int time2retain; | |
290 | int pdu_inorder_en; | |
291 | int dataseq_inorder_en; | |
292 | int erl; | |
843c0a8a | 293 | int fast_abort; |
a54a52ca | 294 | int tpgt; |
b2c64167 MC |
295 | char *username; |
296 | char *username_in; | |
297 | char *password; | |
298 | char *password_in; | |
a54a52ca | 299 | char *targetname; |
3c5c4801 | 300 | char *targetalias; |
88dfd340 MC |
301 | char *ifacename; |
302 | char *initiatorname; | |
3b9373e9 EW |
303 | char *boot_root; |
304 | char *boot_nic; | |
305 | char *boot_target; | |
f8525eb4 AC |
306 | char *portal_type; |
307 | char *discovery_parent_type; | |
308 | uint16_t discovery_parent_idx; | |
309 | uint16_t def_taskmgmt_tmo; | |
310 | uint16_t tsid; | |
311 | uint8_t auto_snd_tgt_disable; | |
312 | uint8_t discovery_sess; | |
313 | uint8_t chap_auth_en; | |
314 | uint8_t discovery_logout_en; | |
315 | uint8_t bidi_chap_en; | |
316 | uint8_t discovery_auth_optional; | |
317 | uint8_t isid[ISID_SIZE]; | |
3b9373e9 | 318 | |
7996a778 MC |
319 | /* control data */ |
320 | struct iscsi_transport *tt; | |
321 | struct Scsi_Host *host; | |
322 | struct iscsi_conn *leadconn; /* leading connection */ | |
659743b0 SP |
323 | /* Between the forward and the backward locks exists a strict locking |
324 | * hierarchy. The mutual exclusion zone protected by the forward lock | |
325 | * can enclose the mutual exclusion zone protected by the backward lock | |
326 | * but not vice versa. | |
327 | */ | |
328 | spinlock_t frwd_lock; /* protects session state, * | |
329 | * cmdsn, queued_cmdsn * | |
7996a778 | 330 | * session resources: * |
659743b0 SP |
331 | * - cmdpool kfifo_out , * |
332 | * - mgmtpool, */ | |
333 | spinlock_t back_lock; /* protects cmdsn_exp * | |
334 | * cmdsn_max, * | |
335 | * cmdpool kfifo_in */ | |
7996a778 | 336 | int state; /* session state */ |
7996a778 MC |
337 | int age; /* counts session re-opens */ |
338 | ||
3e5c28ad | 339 | int scsi_cmds_max; /* max scsi commands */ |
7996a778 | 340 | int cmds_max; /* size of cmds array */ |
9c19a7d0 | 341 | struct iscsi_task **cmds; /* Original Cmds arr */ |
6320377f | 342 | struct iscsi_pool cmdpool; /* PDU's pool */ |
b8b9e1b8 | 343 | void *dd_data; /* LLD private data */ |
7996a778 MC |
344 | }; |
345 | ||
e5bd7b54 MC |
346 | enum { |
347 | ISCSI_HOST_SETUP, | |
348 | ISCSI_HOST_REMOVED, | |
349 | }; | |
350 | ||
75613521 MC |
351 | struct iscsi_host { |
352 | char *initiatorname; | |
353 | /* hw address or netdev iscsi connection is bound to */ | |
354 | char *hwaddress; | |
355 | char *netdev; | |
e5bd7b54 MC |
356 | |
357 | wait_queue_head_t session_removal_wq; | |
358 | /* protects sessions and state */ | |
359 | spinlock_t lock; | |
360 | int num_sessions; | |
361 | int state; | |
32ae763e MC |
362 | |
363 | struct workqueue_struct *workq; | |
364 | char workq_name[20]; | |
75613521 MC |
365 | }; |
366 | ||
7996a778 MC |
367 | /* |
368 | * scsi host template | |
369 | */ | |
7996a778 | 370 | extern int iscsi_eh_abort(struct scsi_cmnd *sc); |
309ce156 JK |
371 | extern int iscsi_eh_recover_target(struct scsi_cmnd *sc); |
372 | extern int iscsi_eh_session_reset(struct scsi_cmnd *sc); | |
843c0a8a | 373 | extern int iscsi_eh_device_reset(struct scsi_cmnd *sc); |
f41d4721 | 374 | extern int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc); |
b6a05c82 | 375 | extern enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc); |
0801c242 | 376 | |
0801c242 MC |
377 | /* |
378 | * iSCSI host helpers. | |
379 | */ | |
5d91e209 MC |
380 | #define iscsi_host_priv(_shost) \ |
381 | (shost_priv(_shost) + sizeof(struct iscsi_host)) | |
382 | ||
0801c242 MC |
383 | extern int iscsi_host_set_param(struct Scsi_Host *shost, |
384 | enum iscsi_host_param param, char *buf, | |
385 | int buflen); | |
386 | extern int iscsi_host_get_param(struct Scsi_Host *shost, | |
387 | enum iscsi_host_param param, char *buf); | |
a4804cd6 MC |
388 | extern int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev); |
389 | extern struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
4d108350 | 390 | int dd_data_size, |
32ae763e | 391 | bool xmit_can_sleep); |
a4804cd6 MC |
392 | extern void iscsi_host_remove(struct Scsi_Host *shost); |
393 | extern void iscsi_host_free(struct Scsi_Host *shost); | |
6b5d6c44 | 394 | extern int iscsi_target_alloc(struct scsi_target *starget); |
7996a778 MC |
395 | |
396 | /* | |
397 | * session management | |
398 | */ | |
399 | extern struct iscsi_cls_session * | |
75613521 | 400 | iscsi_session_setup(struct iscsi_transport *, struct Scsi_Host *shost, |
b8b9e1b8 | 401 | uint16_t, int, int, uint32_t, unsigned int); |
7996a778 | 402 | extern void iscsi_session_teardown(struct iscsi_cls_session *); |
7996a778 | 403 | extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *); |
a54a52ca MC |
404 | extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn, |
405 | enum iscsi_param param, char *buf, int buflen); | |
406 | extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
407 | enum iscsi_param param, char *buf); | |
7996a778 | 408 | |
322d739d | 409 | #define iscsi_session_printk(prefix, _sess, fmt, a...) \ |
75613521 | 410 | iscsi_cls_session_printk(prefix, _sess->cls_session, fmt, ##a) |
322d739d | 411 | |
7996a778 MC |
412 | /* |
413 | * connection management | |
414 | */ | |
415 | extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *, | |
5d91e209 | 416 | int, uint32_t); |
7996a778 MC |
417 | extern void iscsi_conn_teardown(struct iscsi_cls_conn *); |
418 | extern int iscsi_conn_start(struct iscsi_cls_conn *); | |
419 | extern void iscsi_conn_stop(struct iscsi_cls_conn *, int); | |
420 | extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *, | |
421 | int); | |
422 | extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err); | |
40a06e75 | 423 | extern void iscsi_session_failure(struct iscsi_session *session, |
e5bd7b54 | 424 | enum iscsi_err err); |
a54a52ca MC |
425 | extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, |
426 | enum iscsi_param param, char *buf); | |
00f3708e MC |
427 | extern int iscsi_conn_get_addr_param(struct sockaddr_storage *addr, |
428 | enum iscsi_param param, char *buf); | |
5af3e91d | 429 | extern void iscsi_suspend_tx(struct iscsi_conn *conn); |
661134ad | 430 | extern void iscsi_suspend_queue(struct iscsi_conn *conn); |
32ae763e | 431 | extern void iscsi_conn_queue_work(struct iscsi_conn *conn); |
7996a778 | 432 | |
322d739d | 433 | #define iscsi_conn_printk(prefix, _c, fmt, a...) \ |
5af3e91d MC |
434 | iscsi_cls_conn_printk(prefix, ((struct iscsi_conn *)_c)->cls_conn, \ |
435 | fmt, ##a) | |
322d739d | 436 | |
7996a778 MC |
437 | /* |
438 | * pdu and task processing | |
439 | */ | |
77a23c21 | 440 | extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *); |
577577da MC |
441 | extern void iscsi_prep_data_out_pdu(struct iscsi_task *task, |
442 | struct iscsi_r2t_info *r2t, | |
443 | struct iscsi_data *hdr); | |
7996a778 MC |
444 | extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *, |
445 | char *, uint32_t); | |
446 | extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *, | |
447 | char *, int); | |
913e5bf4 MC |
448 | extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *, |
449 | char *, int); | |
0af967f5 | 450 | extern int iscsi_verify_itt(struct iscsi_conn *, itt_t); |
9c19a7d0 | 451 | extern struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *, itt_t); |
8f9256ce | 452 | extern struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *, itt_t); |
9c19a7d0 MC |
453 | extern void iscsi_requeue_task(struct iscsi_task *task); |
454 | extern void iscsi_put_task(struct iscsi_task *task); | |
8eea2f55 | 455 | extern void __iscsi_put_task(struct iscsi_task *task); |
913e5bf4 | 456 | extern void __iscsi_get_task(struct iscsi_task *task); |
4c0ba5d2 MC |
457 | extern void iscsi_complete_scsi_task(struct iscsi_task *task, |
458 | uint32_t exp_cmdsn, uint32_t max_cmdsn); | |
7996a778 MC |
459 | |
460 | /* | |
461 | * generic helpers | |
462 | */ | |
6320377f OK |
463 | extern void iscsi_pool_free(struct iscsi_pool *); |
464 | extern int iscsi_pool_init(struct iscsi_pool *, int, void ***, int); | |
adaf6990 | 465 | extern int iscsi_switch_str_param(char **, char *); |
7996a778 | 466 | |
004d6530 BH |
467 | /* |
468 | * inline functions to deal with padding. | |
469 | */ | |
470 | static inline unsigned int | |
471 | iscsi_padded(unsigned int len) | |
472 | { | |
473 | return (len + ISCSI_PAD_LEN - 1) & ~(ISCSI_PAD_LEN - 1); | |
474 | } | |
475 | ||
476 | static inline unsigned int | |
477 | iscsi_padding(unsigned int len) | |
478 | { | |
479 | len &= (ISCSI_PAD_LEN - 1); | |
480 | if (len) | |
481 | len = ISCSI_PAD_LEN - len; | |
482 | return len; | |
483 | } | |
484 | ||
7996a778 | 485 | #endif |