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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 Christieb6c395e2006-07-24 15:47:15 -050084enum {
Mike Christie3bbaaad2009-05-13 17:57:46 -050085 ISCSI_TASK_FREE,
Mike Christieb6c395e2006-07-24 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 Christieb6c395e2006-07-24 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 Christied355e572009-06-15 22:11:08 -0500128 /* data processing tracking */
129 unsigned long last_xfer;
130 unsigned long last_timeout;
131 bool have_checked_conn;
Mike Christieb6c395e2006-07-24 15:47:15 -0500132 /* state set/tested under session->lock */
133 int state;
Mike Christie60ecebf2006-08-31 18:09:25 -0400134 atomic_t refcount;
Mike Christie7996a772006-04-06 21:13:41 -0500135 struct list_head running; /* running cmd list */
136 void *dd_data; /* driver/transport data */
137};
138
Mike Christie577577d2008-12-02 00:32:05 -0600139static inline int iscsi_task_has_unsol_data(struct iscsi_task *task)
140{
141 return task->unsol_r2t.data_length > task->unsol_r2t.sent;
142}
143
Mike Christie9c19a7d2008-05-21 15:54:09 -0500144static inline void* iscsi_next_hdr(struct iscsi_task *task)
Boaz Harrosh004d6532007-12-13 12:43:23 -0600145{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500146 return (void*)task->hdr + task->hdr_len;
Boaz Harrosh004d6532007-12-13 12:43:23 -0600147}
148
Mike Christie6eabafb2008-01-31 13:36:43 -0600149/* Connection's states */
150enum {
151 ISCSI_CONN_INITIAL_STAGE,
152 ISCSI_CONN_STARTED,
153 ISCSI_CONN_STOPPED,
154 ISCSI_CONN_CLEANUP_WAIT,
155};
156
Mike Christie7996a772006-04-06 21:13:41 -0500157struct iscsi_conn {
158 struct iscsi_cls_conn *cls_conn; /* ptr to class connection */
159 void *dd_data; /* iscsi_transport data */
160 struct iscsi_session *session; /* parent session */
161 /*
Mike Christie7996a772006-04-06 21:13:41 -0500162 * conn_stop() flag: stop to recover, stop to terminate
163 */
164 int stop_stage;
Mike Christief6d51802007-12-13 12:43:30 -0600165 struct timer_list transport_timer;
166 unsigned long last_recv;
167 unsigned long last_ping;
168 int ping_timeout;
169 int recv_timeout;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500170 struct iscsi_task *ping_task;
Mike Christie7996a772006-04-06 21:13:41 -0500171
172 /* iSCSI connection-wide sequencing */
173 uint32_t exp_statsn;
174
175 /* control data */
176 int id; /* CID */
Mike Christie7996a772006-04-06 21:13:41 -0500177 int c_stage; /* connection state */
Mike Christiec8dc1e52006-07-24 15:47:39 -0500178 /*
179 * Preallocated buffer for pdus that have data but do not
180 * originate from scsi-ml. We never have two pdus using the
181 * buffer at the same time. It is only allocated to
182 * the default max recv size because the pdus we support
183 * should always fit in this buffer
184 */
185 char *data;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500186 struct iscsi_task *login_task; /* mtask used for login/text */
187 struct iscsi_task *task; /* xmit task in progress */
Mike Christie7996a772006-04-06 21:13:41 -0500188
189 /* xmit */
Mike Christie843c0a82007-12-13 12:43:20 -0600190 struct list_head mgmtqueue; /* mgmt (control) xmit queue */
Mike Christie3bbaaad2009-05-13 17:57:46 -0500191 struct list_head cmdqueue; /* data-path cmd queue */
Mike Christie843c0a82007-12-13 12:43:20 -0600192 struct list_head requeue; /* tasks needing another run */
Mike Christie7996a772006-04-06 21:13:41 -0500193 struct work_struct xmitwork; /* per-conn. xmit workqueue */
Mike Christie7996a772006-04-06 21:13:41 -0500194 unsigned long suspend_tx; /* suspend Tx */
195 unsigned long suspend_rx; /* suspend Rx */
196
197 /* abort */
198 wait_queue_head_t ehwait; /* used in eh_abort() */
199 struct iscsi_tm tmhdr;
Mike Christie843c0a82007-12-13 12:43:20 -0600200 struct timer_list tmf_timer;
201 int tmf_state; /* see TMF_INITIAL, etc.*/
Mike Christie7996a772006-04-06 21:13:41 -0500202
203 /* negotiated params */
Mike Christie857ae0b2007-05-30 12:57:15 -0500204 unsigned max_recv_dlength; /* initiator_max_recv_dsl*/
205 unsigned max_xmit_dlength; /* target_max_recv_dsl */
Mike Christie7996a772006-04-06 21:13:41 -0500206 int hdrdgst_en;
207 int datadgst_en;
Mike Christiea54a52c2006-06-28 12:00:23 -0500208 int ifmarker_en;
209 int ofmarker_en;
210 /* values userspace uses to id a conn */
211 int persistent_port;
212 char *persistent_address;
Mike Christie22236962007-05-30 12:57:24 -0500213 /* remote portal currently connected to */
214 int portal_port;
215 char portal_address[ISCSI_ADDRESS_BUF_LEN];
Mike Christie7996a772006-04-06 21:13:41 -0500216
217 /* MIB-statistics */
218 uint64_t txdata_octets;
219 uint64_t rxdata_octets;
220 uint32_t scsicmd_pdus_cnt;
221 uint32_t dataout_pdus_cnt;
222 uint32_t scsirsp_pdus_cnt;
223 uint32_t datain_pdus_cnt;
224 uint32_t r2t_pdus_cnt;
225 uint32_t tmfcmd_pdus_cnt;
226 int32_t tmfrsp_pdus_cnt;
227
228 /* custom statistics */
229 uint32_t eh_abort_cnt;
Eli Dorfman87528222008-04-29 13:46:52 -0700230 uint32_t fmr_unalign_cnt;
Mike Christie7996a772006-04-06 21:13:41 -0500231};
232
Olaf Kirch63203772007-12-13 12:43:25 -0600233struct iscsi_pool {
Mike Christie7996a772006-04-06 21:13:41 -0500234 struct kfifo *queue; /* FIFO Queue */
235 void **pool; /* Pool of elements */
236 int max; /* Max number of elements */
237};
238
Mike Christie6eabafb2008-01-31 13:36:43 -0600239/* Session's states */
240enum {
241 ISCSI_STATE_FREE = 1,
242 ISCSI_STATE_LOGGED_IN,
243 ISCSI_STATE_FAILED,
244 ISCSI_STATE_TERMINATE,
245 ISCSI_STATE_IN_RECOVERY,
246 ISCSI_STATE_RECOVERY_FAILED,
247 ISCSI_STATE_LOGGING_OUT,
248};
249
Mike Christie7996a772006-04-06 21:13:41 -0500250struct iscsi_session {
Mike Christie75613522008-05-21 15:53:59 -0500251 struct iscsi_cls_session *cls_session;
Mike Christie6724add2007-08-15 01:38:30 -0500252 /*
253 * Syncs up the scsi eh thread with the iscsi eh thread when sending
254 * task management functions. This must be taken before the session
255 * and recv lock.
256 */
257 struct mutex eh_mutex;
258
Mike Christie7996a772006-04-06 21:13:41 -0500259 /* iSCSI session-wide sequencing */
260 uint32_t cmdsn;
261 uint32_t exp_cmdsn;
262 uint32_t max_cmdsn;
263
Mike Christiee0726402007-07-26 12:46:48 -0500264 /* This tracks the reqs queued into the initiator */
265 uint32_t queued_cmdsn;
266
Mike Christie7996a772006-04-06 21:13:41 -0500267 /* configuration */
Mike Christief6d51802007-12-13 12:43:30 -0600268 int abort_timeout;
269 int lu_reset_timeout;
Mike Christie7996a772006-04-06 21:13:41 -0500270 int initial_r2t_en;
Mike Christie857ae0b2007-05-30 12:57:15 -0500271 unsigned max_r2t;
Mike Christie7996a772006-04-06 21:13:41 -0500272 int imm_data_en;
Mike Christie857ae0b2007-05-30 12:57:15 -0500273 unsigned first_burst;
274 unsigned max_burst;
Mike Christie7996a772006-04-06 21:13:41 -0500275 int time2wait;
276 int time2retain;
277 int pdu_inorder_en;
278 int dataseq_inorder_en;
279 int erl;
Mike Christie843c0a82007-12-13 12:43:20 -0600280 int fast_abort;
Mike Christiea54a52c2006-06-28 12:00:23 -0500281 int tpgt;
Mike Christieb2c64162007-05-30 12:57:16 -0500282 char *username;
283 char *username_in;
284 char *password;
285 char *password_in;
Mike Christiea54a52c2006-06-28 12:00:23 -0500286 char *targetname;
Mike Christie88dfd342008-05-21 15:54:16 -0500287 char *ifacename;
288 char *initiatorname;
Mike Christie7996a772006-04-06 21:13:41 -0500289 /* control data */
290 struct iscsi_transport *tt;
291 struct Scsi_Host *host;
292 struct iscsi_conn *leadconn; /* leading connection */
293 spinlock_t lock; /* protects session state, *
294 * sequence numbers, *
295 * session resources: *
296 * - cmdpool, *
297 * - mgmtpool, *
298 * - r2tpool */
299 int state; /* session state */
Mike Christie7996a772006-04-06 21:13:41 -0500300 int age; /* counts session re-opens */
301
Mike Christie3e5c28a2008-05-21 15:54:06 -0500302 int scsi_cmds_max; /* max scsi commands */
Mike Christie7996a772006-04-06 21:13:41 -0500303 int cmds_max; /* size of cmds array */
Mike Christie9c19a7d2008-05-21 15:54:09 -0500304 struct iscsi_task **cmds; /* Original Cmds arr */
Olaf Kirch63203772007-12-13 12:43:25 -0600305 struct iscsi_pool cmdpool; /* PDU's pool */
Mike Christie7996a772006-04-06 21:13:41 -0500306};
307
Mike Christiee5bd7b52008-09-24 11:46:10 -0500308enum {
309 ISCSI_HOST_SETUP,
310 ISCSI_HOST_REMOVED,
311};
312
Mike Christie75613522008-05-21 15:53:59 -0500313struct iscsi_host {
314 char *initiatorname;
315 /* hw address or netdev iscsi connection is bound to */
316 char *hwaddress;
317 char *netdev;
318 /* local address */
319 int local_port;
320 char local_address[ISCSI_ADDRESS_BUF_LEN];
Mike Christiee5bd7b52008-09-24 11:46:10 -0500321
322 wait_queue_head_t session_removal_wq;
323 /* protects sessions and state */
324 spinlock_t lock;
325 int num_sessions;
326 int state;
Mike Christie32ae7632009-03-05 14:46:03 -0600327
328 struct workqueue_struct *workq;
329 char workq_name[20];
Mike Christie75613522008-05-21 15:53:59 -0500330};
331
Mike Christie7996a772006-04-06 21:13:41 -0500332/*
333 * scsi host template
334 */
335extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth);
336extern int iscsi_eh_abort(struct scsi_cmnd *sc);
Mike Christie8e124522008-09-24 11:46:12 -0500337extern int iscsi_eh_target_reset(struct scsi_cmnd *sc);
Mike Christie843c0a82007-12-13 12:43:20 -0600338extern int iscsi_eh_device_reset(struct scsi_cmnd *sc);
Mike Christie7996a772006-04-06 21:13:41 -0500339extern int iscsi_queuecommand(struct scsi_cmnd *sc,
340 void (*done)(struct scsi_cmnd *));
341
Mike Christie0801c242007-05-30 12:57:12 -0500342/*
343 * iSCSI host helpers.
344 */
Mike Christie5d91e202008-05-21 15:54:01 -0500345#define iscsi_host_priv(_shost) \
346 (shost_priv(_shost) + sizeof(struct iscsi_host))
347
Mike Christie0801c242007-05-30 12:57:12 -0500348extern int iscsi_host_set_param(struct Scsi_Host *shost,
349 enum iscsi_host_param param, char *buf,
350 int buflen);
351extern int iscsi_host_get_param(struct Scsi_Host *shost,
352 enum iscsi_host_param param, char *buf);
Mike Christiea4804cd2008-05-21 15:54:00 -0500353extern int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev);
354extern struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
Mike Christie4d108352009-03-05 14:46:04 -0600355 int dd_data_size,
Mike Christie32ae7632009-03-05 14:46:03 -0600356 bool xmit_can_sleep);
Mike Christiea4804cd2008-05-21 15:54:00 -0500357extern void iscsi_host_remove(struct Scsi_Host *shost);
358extern void iscsi_host_free(struct Scsi_Host *shost);
Mike Christie6b5d6c42009-04-21 15:32:32 -0500359extern int iscsi_target_alloc(struct scsi_target *starget);
Mike Christie0801c242007-05-30 12:57:12 -0500360
Mike Christie7996a772006-04-06 21:13:41 -0500361/*
362 * session management
363 */
364extern struct iscsi_cls_session *
Mike Christie75613522008-05-21 15:53:59 -0500365iscsi_session_setup(struct iscsi_transport *, struct Scsi_Host *shost,
Mike Christie79706342008-05-21 15:54:12 -0500366 uint16_t, int, uint32_t, unsigned int);
Mike Christie7996a772006-04-06 21:13:41 -0500367extern void iscsi_session_teardown(struct iscsi_cls_session *);
Mike Christie7996a772006-04-06 21:13:41 -0500368extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
Mike Christiea54a52c2006-06-28 12:00:23 -0500369extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
370 enum iscsi_param param, char *buf, int buflen);
371extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
372 enum iscsi_param param, char *buf);
Mike Christie7996a772006-04-06 21:13:41 -0500373
Mike Christie322d7392008-01-31 13:36:52 -0600374#define iscsi_session_printk(prefix, _sess, fmt, a...) \
Mike Christie75613522008-05-21 15:53:59 -0500375 iscsi_cls_session_printk(prefix, _sess->cls_session, fmt, ##a)
Mike Christie322d7392008-01-31 13:36:52 -0600376
Mike Christie7996a772006-04-06 21:13:41 -0500377/*
378 * connection management
379 */
380extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *,
Mike Christie5d91e202008-05-21 15:54:01 -0500381 int, uint32_t);
Mike Christie7996a772006-04-06 21:13:41 -0500382extern void iscsi_conn_teardown(struct iscsi_cls_conn *);
383extern int iscsi_conn_start(struct iscsi_cls_conn *);
384extern void iscsi_conn_stop(struct iscsi_cls_conn *, int);
385extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *,
386 int);
387extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err);
Mike Christie40a06e72009-03-05 14:46:05 -0600388extern void iscsi_session_failure(struct iscsi_session *session,
Mike Christiee5bd7b52008-09-24 11:46:10 -0500389 enum iscsi_err err);
Mike Christiea54a52c2006-06-28 12:00:23 -0500390extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
391 enum iscsi_param param, char *buf);
Mike Christie5af3e912008-05-21 15:54:02 -0500392extern void iscsi_suspend_tx(struct iscsi_conn *conn);
Mike Christie661134a2009-09-05 07:35:33 +0530393extern void iscsi_suspend_queue(struct iscsi_conn *conn);
Mike Christie32ae7632009-03-05 14:46:03 -0600394extern void iscsi_conn_queue_work(struct iscsi_conn *conn);
Mike Christie7996a772006-04-06 21:13:41 -0500395
Mike Christie322d7392008-01-31 13:36:52 -0600396#define iscsi_conn_printk(prefix, _c, fmt, a...) \
Mike Christie5af3e912008-05-21 15:54:02 -0500397 iscsi_cls_conn_printk(prefix, ((struct iscsi_conn *)_c)->cls_conn, \
398 fmt, ##a)
Mike Christie322d7392008-01-31 13:36:52 -0600399
Mike Christie7996a772006-04-06 21:13:41 -0500400/*
401 * pdu and task processing
402 */
Mike Christie77a23c22007-05-30 12:57:18 -0500403extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *);
Mike Christie577577d2008-12-02 00:32:05 -0600404extern void iscsi_prep_data_out_pdu(struct iscsi_task *task,
405 struct iscsi_r2t_info *r2t,
406 struct iscsi_data *hdr);
Mike Christie7996a772006-04-06 21:13:41 -0500407extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *,
408 char *, uint32_t);
409extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
410 char *, int);
Mike Christie913e5bf2008-05-21 15:54:18 -0500411extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
412 char *, int);
Mike Christie0af967f2008-05-21 15:54:04 -0500413extern int iscsi_verify_itt(struct iscsi_conn *, itt_t);
Mike Christie9c19a7d2008-05-21 15:54:09 -0500414extern struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *, itt_t);
Mike Christie8f9256c2009-05-13 17:57:41 -0500415extern struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *, itt_t);
Mike Christie9c19a7d2008-05-21 15:54:09 -0500416extern void iscsi_requeue_task(struct iscsi_task *task);
417extern void iscsi_put_task(struct iscsi_task *task);
Mike Christie913e5bf2008-05-21 15:54:18 -0500418extern void __iscsi_get_task(struct iscsi_task *task);
Mike Christie4c0ba5d2009-09-05 07:34:23 +0530419extern void iscsi_complete_scsi_task(struct iscsi_task *task,
420 uint32_t exp_cmdsn, uint32_t max_cmdsn);
Mike Christie7996a772006-04-06 21:13:41 -0500421
422/*
423 * generic helpers
424 */
Olaf Kirch63203772007-12-13 12:43:25 -0600425extern void iscsi_pool_free(struct iscsi_pool *);
426extern int iscsi_pool_init(struct iscsi_pool *, int, void ***, int);
Mike Christie7996a772006-04-06 21:13:41 -0500427
Boaz Harrosh004d6532007-12-13 12:43:23 -0600428/*
429 * inline functions to deal with padding.
430 */
431static inline unsigned int
432iscsi_padded(unsigned int len)
433{
434 return (len + ISCSI_PAD_LEN - 1) & ~(ISCSI_PAD_LEN - 1);
435}
436
437static inline unsigned int
438iscsi_padding(unsigned int len)
439{
440 len &= (ISCSI_PAD_LEN - 1);
441 if (len)
442 len = ISCSI_PAD_LEN - len;
443 return len;
444}
445
Mike Christie7996a772006-04-06 21:13:41 -0500446#endif