blob: 196525cd402f6a86d09d208557f03217dd9bc08a [file] [log] [blame]
Mike Christie7996a772006-04-06 21:13:41 -05001/*
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>
Mike Christie40753ca2008-05-21 15:53:56 -050027#include <linux/wait.h>
Mike Christie7996a772006-04-06 21:13:41 -050028#include <linux/mutex.h>
Al Virof6a57032006-10-18 01:47:25 -040029#include <linux/timer.h>
30#include <linux/workqueue.h>
Mike Christie7996a772006-04-06 21:13:41 -050031#include <scsi/iscsi_proto.h>
32#include <scsi/iscsi_if.h>
Mike Christie262ef632008-12-02 00:32:13 -060033#include <scsi/scsi_transport_iscsi.h>
Mike Christie7996a772006-04-06 21:13:41 -050034
35struct scsi_transport_template;
Mike Christiea4804cd2008-05-21 15:54:00 -050036struct scsi_host_template;
Mike Christie7996a772006-04-06 21:13:41 -050037struct scsi_device;
38struct Scsi_Host;
Mike Christie6b5d6c42009-04-21 15:32:32 -050039struct scsi_target;
Mike Christie7996a772006-04-06 21:13:41 -050040struct scsi_cmnd;
41struct socket;
42struct iscsi_transport;
43struct iscsi_cls_session;
44struct iscsi_cls_conn;
45struct iscsi_session;
46struct iscsi_nopin;
Mike Christiea4804cd2008-05-21 15:54:00 -050047struct device;
Mike Christie7996a772006-04-06 21:13:41 -050048
Mike Christie15482712007-05-30 12:57:19 -050049#define ISCSI_DEF_XMIT_CMDS_MAX 128 /* must be power of 2 */
Mike Christie3cf7b232008-05-21 15:54:17 -050050#define ISCSI_MGMT_CMDS_MAX 15
Mike Christie7996a772006-04-06 21:13:41 -050051
Mike Christiee28f3d52009-03-05 14:46:01 -060052#define ISCSI_DEF_CMD_PER_LUN 32
Mike Christie7996a772006-04-06 21:13:41 -050053
54/* Task Mgmt states */
Mike Christie843c0a82007-12-13 12:43:20 -060055enum {
56 TMF_INITIAL,
57 TMF_QUEUED,
58 TMF_SUCCESS,
59 TMF_FAILED,
60 TMF_TIMEDOUT,
61 TMF_NOT_FOUND,
62};
Mike Christie7996a772006-04-06 21:13:41 -050063
64/* Connection suspend "bit" */
65#define ISCSI_SUSPEND_BIT 1
66
Mike Christie262ef632008-12-02 00:32:13 -060067#define ISCSI_ITT_MASK 0x1fff
Mike Christie3cf7b232008-05-21 15:54:17 -050068#define ISCSI_TOTAL_CMDS_MAX 4096
69/* this must be a power of two greater than ISCSI_MGMT_CMDS_MAX */
70#define ISCSI_TOTAL_CMDS_MIN 16
Mike Christie7996a772006-04-06 21:13:41 -050071#define ISCSI_AGE_SHIFT 28
Mike Christie262ef632008-12-02 00:32:13 -060072#define ISCSI_AGE_MASK 0xf
Mike Christie7996a772006-04-06 21:13:41 -050073
Mike Christie22236962007-05-30 12:57:24 -050074#define ISCSI_ADDRESS_BUF_LEN 64
75
Olaf Kirchda32dd62007-12-13 12:43:21 -060076enum {
Boaz Harrosh004d6532007-12-13 12:43:23 -060077 /* this is the maximum possible storage for AHSs */
78 ISCSI_MAX_AHS_SIZE = sizeof(struct iscsi_ecdb_ahdr) +
79 sizeof(struct iscsi_rlength_ahdr),
Olaf Kirchda32dd62007-12-13 12:43:21 -060080 ISCSI_DIGEST_SIZE = sizeof(__u32),
81};
82
Mike Christie7996a772006-04-06 21:13:41 -050083
Mike Christieb6c395ed2006-07-24 15:47:15 -050084enum {
Mike Christie3bbaaad2009-05-13 17:57:46 -050085 ISCSI_TASK_FREE,
Mike Christieb6c395ed2006-07-24 15:47:15 -050086 ISCSI_TASK_COMPLETED,
87 ISCSI_TASK_PENDING,
88 ISCSI_TASK_RUNNING,
Mike Christieb3cd5052009-05-13 17:57:49 -050089 ISCSI_TASK_ABRT_TMF, /* aborted due to TMF */
90 ISCSI_TASK_ABRT_SESS_RECOV, /* aborted due to session recovery */
Mike Christieb6c395ed2006-07-24 15:47:15 -050091};
92
Mike Christie577577d2008-12-02 00:32:05 -060093struct iscsi_r2t_info {
94 __be32 ttt; /* copied from R2T */
95 __be32 exp_statsn; /* copied from R2T */
96 uint32_t data_length; /* copied from R2T */
97 uint32_t data_offset; /* copied from R2T */
98 int data_count; /* DATA-Out payload progress */
99 int datasn;
100 /* LLDs should set/update these values */
101 int sent; /* R2T sequence progress */
102};
103
Mike Christie9c19a7d2008-05-21 15:54:09 -0500104struct iscsi_task {
Mike Christie7996a772006-04-06 21:13:41 -0500105 /*
Boaz Harrosh004d6532007-12-13 12:43:23 -0600106 * Because LLDs allocate their hdr differently, this is a pointer
107 * and length to that storage. It must be setup at session
108 * creation time.
Mike Christie7996a772006-04-06 21:13:41 -0500109 */
Mike Christie577577d2008-12-02 00:32:05 -0600110 struct iscsi_hdr *hdr;
Boaz Harrosh004d6532007-12-13 12:43:23 -0600111 unsigned short hdr_max;
112 unsigned short hdr_len; /* accumulated size of hdr used */
Mike Christie577577d2008-12-02 00:32:05 -0600113 /* copied values in case we need to send tmfs */
114 itt_t hdr_itt;
115 __be32 cmdsn;
116 uint8_t lun[8];
117
Mike Christie7996a772006-04-06 21:13:41 -0500118 int itt; /* this ITT */
Mike Christie7996a772006-04-06 21:13:41 -0500119
Mike Christie857ae0b2007-05-30 12:57:15 -0500120 unsigned imm_count; /* imm-data (bytes) */
Mike Christieffd04362006-08-31 18:09:24 -0400121 /* offset in unsolicited stream (bytes); */
Mike Christie577577d2008-12-02 00:32:05 -0600122 struct iscsi_r2t_info unsol_r2t;
Mike Christie3e5c28a2008-05-21 15:54:06 -0500123 char *data; /* mgmt payload */
Mike Christie577577d2008-12-02 00:32:05 -0600124 unsigned data_count;
Mike Christie7996a772006-04-06 21:13:41 -0500125 struct scsi_cmnd *sc; /* associated SCSI cmd*/
Mike Christie7996a772006-04-06 21:13:41 -0500126 struct iscsi_conn *conn; /* used connection */
Mike Christie7996a772006-04-06 21:13:41 -0500127
Mike Christieb6c395ed2006-07-24 15:47:15 -0500128 /* state set/tested under session->lock */
129 int state;
Mike Christie60ecebf2006-08-31 18:09:25 -0400130 atomic_t refcount;
Mike Christie7996a772006-04-06 21:13:41 -0500131 struct list_head running; /* running cmd list */
132 void *dd_data; /* driver/transport data */
133};
134
Mike Christie577577d2008-12-02 00:32:05 -0600135static 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
Mike Christie9c19a7d2008-05-21 15:54:09 -0500140static inline void* iscsi_next_hdr(struct iscsi_task *task)
Boaz Harrosh004d6532007-12-13 12:43:23 -0600141{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500142 return (void*)task->hdr + task->hdr_len;
Boaz Harrosh004d6532007-12-13 12:43:23 -0600143}
144
Mike Christie6eabafb2008-01-31 13:36:43 -0600145/* Connection's states */
146enum {
147 ISCSI_CONN_INITIAL_STAGE,
148 ISCSI_CONN_STARTED,
149 ISCSI_CONN_STOPPED,
150 ISCSI_CONN_CLEANUP_WAIT,
151};
152
Mike Christie7996a772006-04-06 21:13:41 -0500153struct 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 */
157 /*
Mike Christie7996a772006-04-06 21:13:41 -0500158 * conn_stop() flag: stop to recover, stop to terminate
159 */
160 int stop_stage;
Mike Christief6d5180c72007-12-13 12:43:30 -0600161 struct timer_list transport_timer;
162 unsigned long last_recv;
163 unsigned long last_ping;
164 int ping_timeout;
165 int recv_timeout;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500166 struct iscsi_task *ping_task;
Mike Christie7996a772006-04-06 21:13:41 -0500167
168 /* iSCSI connection-wide sequencing */
169 uint32_t exp_statsn;
170
171 /* control data */
172 int id; /* CID */
Mike Christie7996a772006-04-06 21:13:41 -0500173 int c_stage; /* connection state */
Mike Christiec8dc1e52006-07-24 15:47:39 -0500174 /*
175 * Preallocated buffer for pdus that have data but do not
176 * originate from scsi-ml. We never have two pdus using the
177 * buffer at the same time. It is only allocated to
178 * the default max recv size because the pdus we support
179 * should always fit in this buffer
180 */
181 char *data;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500182 struct iscsi_task *login_task; /* mtask used for login/text */
183 struct iscsi_task *task; /* xmit task in progress */
Mike Christie7996a772006-04-06 21:13:41 -0500184
185 /* xmit */
Mike Christie843c0a82007-12-13 12:43:20 -0600186 struct list_head mgmtqueue; /* mgmt (control) xmit queue */
Mike Christie3bbaaad2009-05-13 17:57:46 -0500187 struct list_head cmdqueue; /* data-path cmd queue */
Mike Christie843c0a82007-12-13 12:43:20 -0600188 struct list_head requeue; /* tasks needing another run */
Mike Christie7996a772006-04-06 21:13:41 -0500189 struct work_struct xmitwork; /* per-conn. xmit workqueue */
Mike Christie7996a772006-04-06 21:13:41 -0500190 unsigned long suspend_tx; /* suspend Tx */
191 unsigned long suspend_rx; /* suspend Rx */
192
193 /* abort */
194 wait_queue_head_t ehwait; /* used in eh_abort() */
195 struct iscsi_tm tmhdr;
Mike Christie843c0a82007-12-13 12:43:20 -0600196 struct timer_list tmf_timer;
197 int tmf_state; /* see TMF_INITIAL, etc.*/
Mike Christie7996a772006-04-06 21:13:41 -0500198
199 /* negotiated params */
Mike Christie857ae0b2007-05-30 12:57:15 -0500200 unsigned max_recv_dlength; /* initiator_max_recv_dsl*/
201 unsigned max_xmit_dlength; /* target_max_recv_dsl */
Mike Christie7996a772006-04-06 21:13:41 -0500202 int hdrdgst_en;
203 int datadgst_en;
Mike Christiea54a52c2006-06-28 12:00:23 -0500204 int ifmarker_en;
205 int ofmarker_en;
206 /* values userspace uses to id a conn */
207 int persistent_port;
208 char *persistent_address;
Mike Christie22236962007-05-30 12:57:24 -0500209 /* remote portal currently connected to */
210 int portal_port;
211 char portal_address[ISCSI_ADDRESS_BUF_LEN];
Mike Christie7996a772006-04-06 21:13:41 -0500212
213 /* MIB-statistics */
214 uint64_t txdata_octets;
215 uint64_t rxdata_octets;
216 uint32_t scsicmd_pdus_cnt;
217 uint32_t dataout_pdus_cnt;
218 uint32_t scsirsp_pdus_cnt;
219 uint32_t datain_pdus_cnt;
220 uint32_t r2t_pdus_cnt;
221 uint32_t tmfcmd_pdus_cnt;
222 int32_t tmfrsp_pdus_cnt;
223
224 /* custom statistics */
225 uint32_t eh_abort_cnt;
Eli Dorfman87528222008-04-29 13:46:52 -0700226 uint32_t fmr_unalign_cnt;
Mike Christie7996a772006-04-06 21:13:41 -0500227};
228
Olaf Kirch63203772007-12-13 12:43:25 -0600229struct iscsi_pool {
Mike Christie7996a772006-04-06 21:13:41 -0500230 struct kfifo *queue; /* FIFO Queue */
231 void **pool; /* Pool of elements */
232 int max; /* Max number of elements */
233};
234
Mike Christie6eabafb2008-01-31 13:36:43 -0600235/* Session's states */
236enum {
237 ISCSI_STATE_FREE = 1,
238 ISCSI_STATE_LOGGED_IN,
239 ISCSI_STATE_FAILED,
240 ISCSI_STATE_TERMINATE,
241 ISCSI_STATE_IN_RECOVERY,
242 ISCSI_STATE_RECOVERY_FAILED,
243 ISCSI_STATE_LOGGING_OUT,
244};
245
Mike Christie7996a772006-04-06 21:13:41 -0500246struct iscsi_session {
Mike Christie75613522008-05-21 15:53:59 -0500247 struct iscsi_cls_session *cls_session;
Mike Christie6724add2007-08-15 01:38:30 -0500248 /*
249 * Syncs up the scsi eh thread with the iscsi eh thread when sending
250 * task management functions. This must be taken before the session
251 * and recv lock.
252 */
253 struct mutex eh_mutex;
254
Mike Christie7996a772006-04-06 21:13:41 -0500255 /* iSCSI session-wide sequencing */
256 uint32_t cmdsn;
257 uint32_t exp_cmdsn;
258 uint32_t max_cmdsn;
259
Mike Christiee0726402007-07-26 12:46:48 -0500260 /* This tracks the reqs queued into the initiator */
261 uint32_t queued_cmdsn;
262
Mike Christie7996a772006-04-06 21:13:41 -0500263 /* configuration */
Mike Christief6d5180c72007-12-13 12:43:30 -0600264 int abort_timeout;
265 int lu_reset_timeout;
Mike Christie7996a772006-04-06 21:13:41 -0500266 int initial_r2t_en;
Mike Christie857ae0b2007-05-30 12:57:15 -0500267 unsigned max_r2t;
Mike Christie7996a772006-04-06 21:13:41 -0500268 int imm_data_en;
Mike Christie857ae0b2007-05-30 12:57:15 -0500269 unsigned first_burst;
270 unsigned max_burst;
Mike Christie7996a772006-04-06 21:13:41 -0500271 int time2wait;
272 int time2retain;
273 int pdu_inorder_en;
274 int dataseq_inorder_en;
275 int erl;
Mike Christie843c0a82007-12-13 12:43:20 -0600276 int fast_abort;
Mike Christiea54a52c2006-06-28 12:00:23 -0500277 int tpgt;
Mike Christieb2c64162007-05-30 12:57:16 -0500278 char *username;
279 char *username_in;
280 char *password;
281 char *password_in;
Mike Christiea54a52c2006-06-28 12:00:23 -0500282 char *targetname;
Mike Christie88dfd342008-05-21 15:54:16 -0500283 char *ifacename;
284 char *initiatorname;
Mike Christie7996a772006-04-06 21:13:41 -0500285 /* 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 */
Mike Christie7996a772006-04-06 21:13:41 -0500296 int age; /* counts session re-opens */
297
Mike Christie3e5c28a2008-05-21 15:54:06 -0500298 int scsi_cmds_max; /* max scsi commands */
Mike Christie7996a772006-04-06 21:13:41 -0500299 int cmds_max; /* size of cmds array */
Mike Christie9c19a7d2008-05-21 15:54:09 -0500300 struct iscsi_task **cmds; /* Original Cmds arr */
Olaf Kirch63203772007-12-13 12:43:25 -0600301 struct iscsi_pool cmdpool; /* PDU's pool */
Mike Christie7996a772006-04-06 21:13:41 -0500302};
303
Mike Christiee5bd7b542008-09-24 11:46:10 -0500304enum {
305 ISCSI_HOST_SETUP,
306 ISCSI_HOST_REMOVED,
307};
308
Mike Christie75613522008-05-21 15:53:59 -0500309struct iscsi_host {
310 char *initiatorname;
311 /* hw address or netdev iscsi connection is bound to */
312 char *hwaddress;
313 char *netdev;
314 /* local address */
315 int local_port;
316 char local_address[ISCSI_ADDRESS_BUF_LEN];
Mike Christiee5bd7b542008-09-24 11:46:10 -0500317
318 wait_queue_head_t session_removal_wq;
319 /* protects sessions and state */
320 spinlock_t lock;
321 int num_sessions;
322 int state;
Mike Christie32ae7632009-03-05 14:46:03 -0600323
324 struct workqueue_struct *workq;
325 char workq_name[20];
Mike Christie75613522008-05-21 15:53:59 -0500326};
327
Mike Christie7996a772006-04-06 21:13:41 -0500328/*
329 * scsi host template
330 */
331extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth);
332extern int iscsi_eh_abort(struct scsi_cmnd *sc);
Mike Christie8e124522008-09-24 11:46:12 -0500333extern int iscsi_eh_target_reset(struct scsi_cmnd *sc);
Mike Christie843c0a82007-12-13 12:43:20 -0600334extern int iscsi_eh_device_reset(struct scsi_cmnd *sc);
Mike Christie7996a772006-04-06 21:13:41 -0500335extern int iscsi_queuecommand(struct scsi_cmnd *sc,
336 void (*done)(struct scsi_cmnd *));
337
Mike Christie0801c242007-05-30 12:57:12 -0500338/*
339 * iSCSI host helpers.
340 */
Mike Christie5d91e202008-05-21 15:54:01 -0500341#define iscsi_host_priv(_shost) \
342 (shost_priv(_shost) + sizeof(struct iscsi_host))
343
Mike Christie0801c242007-05-30 12:57:12 -0500344extern int iscsi_host_set_param(struct Scsi_Host *shost,
345 enum iscsi_host_param param, char *buf,
346 int buflen);
347extern int iscsi_host_get_param(struct Scsi_Host *shost,
348 enum iscsi_host_param param, char *buf);
Mike Christiea4804cd2008-05-21 15:54:00 -0500349extern int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev);
350extern struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
Mike Christie4d108352009-03-05 14:46:04 -0600351 int dd_data_size,
Mike Christie32ae7632009-03-05 14:46:03 -0600352 bool xmit_can_sleep);
Mike Christiea4804cd2008-05-21 15:54:00 -0500353extern void iscsi_host_remove(struct Scsi_Host *shost);
354extern void iscsi_host_free(struct Scsi_Host *shost);
Mike Christie6b5d6c42009-04-21 15:32:32 -0500355extern int iscsi_target_alloc(struct scsi_target *starget);
Mike Christie0801c242007-05-30 12:57:12 -0500356
Mike Christie7996a772006-04-06 21:13:41 -0500357/*
358 * session management
359 */
360extern struct iscsi_cls_session *
Mike Christie75613522008-05-21 15:53:59 -0500361iscsi_session_setup(struct iscsi_transport *, struct Scsi_Host *shost,
Mike Christie79706342008-05-21 15:54:12 -0500362 uint16_t, int, uint32_t, unsigned int);
Mike Christie7996a772006-04-06 21:13:41 -0500363extern void iscsi_session_teardown(struct iscsi_cls_session *);
Mike Christie7996a772006-04-06 21:13:41 -0500364extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
Mike Christiea54a52c2006-06-28 12:00:23 -0500365extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
366 enum iscsi_param param, char *buf, int buflen);
367extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
368 enum iscsi_param param, char *buf);
Mike Christie7996a772006-04-06 21:13:41 -0500369
Mike Christie322d7392008-01-31 13:36:52 -0600370#define iscsi_session_printk(prefix, _sess, fmt, a...) \
Mike Christie75613522008-05-21 15:53:59 -0500371 iscsi_cls_session_printk(prefix, _sess->cls_session, fmt, ##a)
Mike Christie322d7392008-01-31 13:36:52 -0600372
Mike Christie7996a772006-04-06 21:13:41 -0500373/*
374 * connection management
375 */
376extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *,
Mike Christie5d91e202008-05-21 15:54:01 -0500377 int, uint32_t);
Mike Christie7996a772006-04-06 21:13:41 -0500378extern void iscsi_conn_teardown(struct iscsi_cls_conn *);
379extern int iscsi_conn_start(struct iscsi_cls_conn *);
380extern void iscsi_conn_stop(struct iscsi_cls_conn *, int);
381extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *,
382 int);
383extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err);
Mike Christie40a06e72009-03-05 14:46:05 -0600384extern void iscsi_session_failure(struct iscsi_session *session,
Mike Christiee5bd7b542008-09-24 11:46:10 -0500385 enum iscsi_err err);
Mike Christiea54a52c2006-06-28 12:00:23 -0500386extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
387 enum iscsi_param param, char *buf);
Mike Christie5af3e912008-05-21 15:54:02 -0500388extern void iscsi_suspend_tx(struct iscsi_conn *conn);
Mike Christie32ae7632009-03-05 14:46:03 -0600389extern void iscsi_conn_queue_work(struct iscsi_conn *conn);
Mike Christie7996a772006-04-06 21:13:41 -0500390
Mike Christie322d7392008-01-31 13:36:52 -0600391#define iscsi_conn_printk(prefix, _c, fmt, a...) \
Mike Christie5af3e912008-05-21 15:54:02 -0500392 iscsi_cls_conn_printk(prefix, ((struct iscsi_conn *)_c)->cls_conn, \
393 fmt, ##a)
Mike Christie322d7392008-01-31 13:36:52 -0600394
Mike Christie7996a772006-04-06 21:13:41 -0500395/*
396 * pdu and task processing
397 */
Mike Christie77a23c22007-05-30 12:57:18 -0500398extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *);
Mike Christie577577d2008-12-02 00:32:05 -0600399extern void iscsi_prep_data_out_pdu(struct iscsi_task *task,
400 struct iscsi_r2t_info *r2t,
401 struct iscsi_data *hdr);
Mike Christie7996a772006-04-06 21:13:41 -0500402extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *,
403 char *, uint32_t);
404extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
405 char *, int);
Mike Christie913e5bf2008-05-21 15:54:18 -0500406extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
407 char *, int);
Mike Christie0af967f2008-05-21 15:54:04 -0500408extern int iscsi_verify_itt(struct iscsi_conn *, itt_t);
Mike Christie9c19a7d2008-05-21 15:54:09 -0500409extern struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *, itt_t);
Mike Christie8f9256c2009-05-13 17:57:41 -0500410extern struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *, itt_t);
Mike Christie9c19a7d2008-05-21 15:54:09 -0500411extern void iscsi_requeue_task(struct iscsi_task *task);
412extern void iscsi_put_task(struct iscsi_task *task);
Mike Christie913e5bf2008-05-21 15:54:18 -0500413extern void __iscsi_get_task(struct iscsi_task *task);
Mike Christie7996a772006-04-06 21:13:41 -0500414
415/*
416 * generic helpers
417 */
Olaf Kirch63203772007-12-13 12:43:25 -0600418extern void iscsi_pool_free(struct iscsi_pool *);
419extern int iscsi_pool_init(struct iscsi_pool *, int, void ***, int);
Mike Christie7996a772006-04-06 21:13:41 -0500420
Boaz Harrosh004d6532007-12-13 12:43:23 -0600421/*
422 * inline functions to deal with padding.
423 */
424static inline unsigned int
425iscsi_padded(unsigned int len)
426{
427 return (len + ISCSI_PAD_LEN - 1) & ~(ISCSI_PAD_LEN - 1);
428}
429
430static inline unsigned int
431iscsi_padding(unsigned int len)
432{
433 len &= (ISCSI_PAD_LEN - 1);
434 if (len)
435 len = ISCSI_PAD_LEN - len;
436 return len;
437}
438
Mike Christie7996a772006-04-06 21:13:41 -0500439#endif