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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>
Stefani Seibold45465482009-12-21 14:37:26 -080031#include <linux/kfifo.h>
Mike Christie7996a772006-04-06 21:13:41 -050032#include <scsi/iscsi_proto.h>
33#include <scsi/iscsi_if.h>
Mike Christie262ef632008-12-02 00:32:13 -060034#include <scsi/scsi_transport_iscsi.h>
Mike Christie7996a772006-04-06 21:13:41 -050035
36struct scsi_transport_template;
Mike Christiea4804cd2008-05-21 15:54:00 -050037struct scsi_host_template;
Mike Christie7996a772006-04-06 21:13:41 -050038struct scsi_device;
39struct Scsi_Host;
Mike Christie6b5d6c42009-04-21 15:32:32 -050040struct scsi_target;
Mike Christie7996a772006-04-06 21:13:41 -050041struct scsi_cmnd;
42struct socket;
43struct iscsi_transport;
44struct iscsi_cls_session;
45struct iscsi_cls_conn;
46struct iscsi_session;
47struct iscsi_nopin;
Mike Christiea4804cd2008-05-21 15:54:00 -050048struct device;
Mike Christie7996a772006-04-06 21:13:41 -050049
Mike Christie15482712007-05-30 12:57:19 -050050#define ISCSI_DEF_XMIT_CMDS_MAX 128 /* must be power of 2 */
Mike Christie3cf7b232008-05-21 15:54:17 -050051#define ISCSI_MGMT_CMDS_MAX 15
Mike Christie7996a772006-04-06 21:13:41 -050052
Mike Christiee28f3d52009-03-05 14:46:01 -060053#define ISCSI_DEF_CMD_PER_LUN 32
Mike Christie7996a772006-04-06 21:13:41 -050054
55/* Task Mgmt states */
Mike Christie843c0a82007-12-13 12:43:20 -060056enum {
57 TMF_INITIAL,
58 TMF_QUEUED,
59 TMF_SUCCESS,
60 TMF_FAILED,
61 TMF_TIMEDOUT,
62 TMF_NOT_FOUND,
63};
Mike Christie7996a772006-04-06 21:13:41 -050064
65/* Connection suspend "bit" */
66#define ISCSI_SUSPEND_BIT 1
67
Mike Christie262ef632008-12-02 00:32:13 -060068#define ISCSI_ITT_MASK 0x1fff
Mike Christie3cf7b232008-05-21 15:54:17 -050069#define ISCSI_TOTAL_CMDS_MAX 4096
70/* this must be a power of two greater than ISCSI_MGMT_CMDS_MAX */
71#define ISCSI_TOTAL_CMDS_MIN 16
Mike Christie7996a772006-04-06 21:13:41 -050072#define ISCSI_AGE_SHIFT 28
Mike Christie262ef632008-12-02 00:32:13 -060073#define ISCSI_AGE_MASK 0xf
Mike Christie7996a772006-04-06 21:13:41 -050074
Mike Christie22236962007-05-30 12:57:24 -050075#define ISCSI_ADDRESS_BUF_LEN 64
76
Olaf Kirchda32dd62007-12-13 12:43:21 -060077enum {
Boaz Harrosh004d6532007-12-13 12:43:23 -060078 /* this is the maximum possible storage for AHSs */
79 ISCSI_MAX_AHS_SIZE = sizeof(struct iscsi_ecdb_ahdr) +
80 sizeof(struct iscsi_rlength_ahdr),
Olaf Kirchda32dd62007-12-13 12:43:21 -060081 ISCSI_DIGEST_SIZE = sizeof(__u32),
82};
83
Mike Christie7996a772006-04-06 21:13:41 -050084
Mike Christieb6c395e2006-07-24 15:47:15 -050085enum {
Mike Christie3bbaaad2009-05-13 17:57:46 -050086 ISCSI_TASK_FREE,
Mike Christieb6c395e2006-07-24 15:47:15 -050087 ISCSI_TASK_COMPLETED,
88 ISCSI_TASK_PENDING,
89 ISCSI_TASK_RUNNING,
Mike Christieb3cd5052009-05-13 17:57:49 -050090 ISCSI_TASK_ABRT_TMF, /* aborted due to TMF */
91 ISCSI_TASK_ABRT_SESS_RECOV, /* aborted due to session recovery */
Mike Christieb6c395e2006-07-24 15:47:15 -050092};
93
Mike Christie577577d2008-12-02 00:32:05 -060094struct iscsi_r2t_info {
95 __be32 ttt; /* copied from R2T */
96 __be32 exp_statsn; /* copied from R2T */
97 uint32_t data_length; /* copied from R2T */
98 uint32_t data_offset; /* copied from R2T */
99 int data_count; /* DATA-Out payload progress */
100 int datasn;
101 /* LLDs should set/update these values */
102 int sent; /* R2T sequence progress */
103};
104
Mike Christie9c19a7d2008-05-21 15:54:09 -0500105struct iscsi_task {
Mike Christie7996a772006-04-06 21:13:41 -0500106 /*
Boaz Harrosh004d6532007-12-13 12:43:23 -0600107 * Because LLDs allocate their hdr differently, this is a pointer
108 * and length to that storage. It must be setup at session
109 * creation time.
Mike Christie7996a772006-04-06 21:13:41 -0500110 */
Mike Christie577577d2008-12-02 00:32:05 -0600111 struct iscsi_hdr *hdr;
Boaz Harrosh004d6532007-12-13 12:43:23 -0600112 unsigned short hdr_max;
113 unsigned short hdr_len; /* accumulated size of hdr used */
Mike Christie577577d2008-12-02 00:32:05 -0600114 /* copied values in case we need to send tmfs */
115 itt_t hdr_itt;
116 __be32 cmdsn;
117 uint8_t lun[8];
118
Mike Christie7996a772006-04-06 21:13:41 -0500119 int itt; /* this ITT */
Mike Christie7996a772006-04-06 21:13:41 -0500120
Mike Christie857ae0b2007-05-30 12:57:15 -0500121 unsigned imm_count; /* imm-data (bytes) */
Mike Christieffd04362006-08-31 18:09:24 -0400122 /* offset in unsolicited stream (bytes); */
Mike Christie577577d2008-12-02 00:32:05 -0600123 struct iscsi_r2t_info unsol_r2t;
Mike Christie3e5c28a2008-05-21 15:54:06 -0500124 char *data; /* mgmt payload */
Mike Christie577577d2008-12-02 00:32:05 -0600125 unsigned data_count;
Mike Christie7996a772006-04-06 21:13:41 -0500126 struct scsi_cmnd *sc; /* associated SCSI cmd*/
Mike Christie7996a772006-04-06 21:13:41 -0500127 struct iscsi_conn *conn; /* used connection */
Mike Christie7996a772006-04-06 21:13:41 -0500128
Mike Christied355e572009-06-15 22:11:08 -0500129 /* data processing tracking */
130 unsigned long last_xfer;
131 unsigned long last_timeout;
132 bool have_checked_conn;
Mike Christieb6c395e2006-07-24 15:47:15 -0500133 /* state set/tested under session->lock */
134 int state;
Mike Christie60ecebf2006-08-31 18:09:25 -0400135 atomic_t refcount;
Mike Christie7996a772006-04-06 21:13:41 -0500136 struct list_head running; /* running cmd list */
137 void *dd_data; /* driver/transport data */
138};
139
Mike Christie577577d2008-12-02 00:32:05 -0600140static inline int iscsi_task_has_unsol_data(struct iscsi_task *task)
141{
142 return task->unsol_r2t.data_length > task->unsol_r2t.sent;
143}
144
Mike Christie9c19a7d2008-05-21 15:54:09 -0500145static inline void* iscsi_next_hdr(struct iscsi_task *task)
Boaz Harrosh004d6532007-12-13 12:43:23 -0600146{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500147 return (void*)task->hdr + task->hdr_len;
Boaz Harrosh004d6532007-12-13 12:43:23 -0600148}
149
Mike Christie6eabafb2008-01-31 13:36:43 -0600150/* Connection's states */
151enum {
152 ISCSI_CONN_INITIAL_STAGE,
153 ISCSI_CONN_STARTED,
154 ISCSI_CONN_STOPPED,
155 ISCSI_CONN_CLEANUP_WAIT,
156};
157
Mike Christie7996a772006-04-06 21:13:41 -0500158struct iscsi_conn {
159 struct iscsi_cls_conn *cls_conn; /* ptr to class connection */
160 void *dd_data; /* iscsi_transport data */
161 struct iscsi_session *session; /* parent session */
162 /*
Mike Christie7996a772006-04-06 21:13:41 -0500163 * conn_stop() flag: stop to recover, stop to terminate
164 */
165 int stop_stage;
Mike Christief6d51802007-12-13 12:43:30 -0600166 struct timer_list transport_timer;
167 unsigned long last_recv;
168 unsigned long last_ping;
169 int ping_timeout;
170 int recv_timeout;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500171 struct iscsi_task *ping_task;
Mike Christie7996a772006-04-06 21:13:41 -0500172
173 /* iSCSI connection-wide sequencing */
174 uint32_t exp_statsn;
175
176 /* control data */
177 int id; /* CID */
Mike Christie7996a772006-04-06 21:13:41 -0500178 int c_stage; /* connection state */
Mike Christiec8dc1e52006-07-24 15:47:39 -0500179 /*
180 * Preallocated buffer for pdus that have data but do not
181 * originate from scsi-ml. We never have two pdus using the
182 * buffer at the same time. It is only allocated to
183 * the default max recv size because the pdus we support
184 * should always fit in this buffer
185 */
186 char *data;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500187 struct iscsi_task *login_task; /* mtask used for login/text */
188 struct iscsi_task *task; /* xmit task in progress */
Mike Christie7996a772006-04-06 21:13:41 -0500189
190 /* xmit */
Mike Christie843c0a82007-12-13 12:43:20 -0600191 struct list_head mgmtqueue; /* mgmt (control) xmit queue */
Mike Christie3bbaaad2009-05-13 17:57:46 -0500192 struct list_head cmdqueue; /* data-path cmd queue */
Mike Christie843c0a82007-12-13 12:43:20 -0600193 struct list_head requeue; /* tasks needing another run */
Mike Christie7996a772006-04-06 21:13:41 -0500194 struct work_struct xmitwork; /* per-conn. xmit workqueue */
Mike Christie7996a772006-04-06 21:13:41 -0500195 unsigned long suspend_tx; /* suspend Tx */
196 unsigned long suspend_rx; /* suspend Rx */
197
198 /* abort */
199 wait_queue_head_t ehwait; /* used in eh_abort() */
200 struct iscsi_tm tmhdr;
Mike Christie843c0a82007-12-13 12:43:20 -0600201 struct timer_list tmf_timer;
202 int tmf_state; /* see TMF_INITIAL, etc.*/
Mike Christie7996a772006-04-06 21:13:41 -0500203
204 /* negotiated params */
Mike Christie857ae0b2007-05-30 12:57:15 -0500205 unsigned max_recv_dlength; /* initiator_max_recv_dsl*/
206 unsigned max_xmit_dlength; /* target_max_recv_dsl */
Mike Christie7996a772006-04-06 21:13:41 -0500207 int hdrdgst_en;
208 int datadgst_en;
Mike Christiea54a52c2006-06-28 12:00:23 -0500209 int ifmarker_en;
210 int ofmarker_en;
211 /* values userspace uses to id a conn */
212 int persistent_port;
213 char *persistent_address;
Mike Christie22236962007-05-30 12:57:24 -0500214 /* remote portal currently connected to */
215 int portal_port;
216 char portal_address[ISCSI_ADDRESS_BUF_LEN];
Mike Christie7996a772006-04-06 21:13:41 -0500217
218 /* MIB-statistics */
219 uint64_t txdata_octets;
220 uint64_t rxdata_octets;
221 uint32_t scsicmd_pdus_cnt;
222 uint32_t dataout_pdus_cnt;
223 uint32_t scsirsp_pdus_cnt;
224 uint32_t datain_pdus_cnt;
225 uint32_t r2t_pdus_cnt;
226 uint32_t tmfcmd_pdus_cnt;
227 int32_t tmfrsp_pdus_cnt;
228
229 /* custom statistics */
230 uint32_t eh_abort_cnt;
Eli Dorfman87528222008-04-29 13:46:52 -0700231 uint32_t fmr_unalign_cnt;
Mike Christie7996a772006-04-06 21:13:41 -0500232};
233
Olaf Kirch63203772007-12-13 12:43:25 -0600234struct iscsi_pool {
Stefani Seibold45465482009-12-21 14:37:26 -0800235 struct kfifo queue; /* FIFO Queue */
Mike Christie7996a772006-04-06 21:13:41 -0500236 void **pool; /* Pool of elements */
237 int max; /* Max number of elements */
238};
239
Mike Christie6eabafb2008-01-31 13:36:43 -0600240/* Session's states */
241enum {
242 ISCSI_STATE_FREE = 1,
243 ISCSI_STATE_LOGGED_IN,
244 ISCSI_STATE_FAILED,
245 ISCSI_STATE_TERMINATE,
246 ISCSI_STATE_IN_RECOVERY,
247 ISCSI_STATE_RECOVERY_FAILED,
248 ISCSI_STATE_LOGGING_OUT,
249};
250
Mike Christie7996a772006-04-06 21:13:41 -0500251struct iscsi_session {
Mike Christie75613522008-05-21 15:53:59 -0500252 struct iscsi_cls_session *cls_session;
Mike Christie6724add2007-08-15 01:38:30 -0500253 /*
254 * Syncs up the scsi eh thread with the iscsi eh thread when sending
255 * task management functions. This must be taken before the session
256 * and recv lock.
257 */
258 struct mutex eh_mutex;
259
Mike Christie7996a772006-04-06 21:13:41 -0500260 /* iSCSI session-wide sequencing */
261 uint32_t cmdsn;
262 uint32_t exp_cmdsn;
263 uint32_t max_cmdsn;
264
Mike Christiee0726402007-07-26 12:46:48 -0500265 /* This tracks the reqs queued into the initiator */
266 uint32_t queued_cmdsn;
267
Mike Christie7996a772006-04-06 21:13:41 -0500268 /* configuration */
Mike Christief6d51802007-12-13 12:43:30 -0600269 int abort_timeout;
270 int lu_reset_timeout;
Mike Christie3fe5ae82009-11-11 16:34:33 -0600271 int tgt_reset_timeout;
Mike Christie7996a772006-04-06 21:13:41 -0500272 int initial_r2t_en;
Mike Christie857ae0b2007-05-30 12:57:15 -0500273 unsigned max_r2t;
Mike Christie7996a772006-04-06 21:13:41 -0500274 int imm_data_en;
Mike Christie857ae0b2007-05-30 12:57:15 -0500275 unsigned first_burst;
276 unsigned max_burst;
Mike Christie7996a772006-04-06 21:13:41 -0500277 int time2wait;
278 int time2retain;
279 int pdu_inorder_en;
280 int dataseq_inorder_en;
281 int erl;
Mike Christie843c0a82007-12-13 12:43:20 -0600282 int fast_abort;
Mike Christiea54a52c2006-06-28 12:00:23 -0500283 int tpgt;
Mike Christieb2c64162007-05-30 12:57:16 -0500284 char *username;
285 char *username_in;
286 char *password;
287 char *password_in;
Mike Christiea54a52c2006-06-28 12:00:23 -0500288 char *targetname;
Mike Christie88dfd342008-05-21 15:54:16 -0500289 char *ifacename;
290 char *initiatorname;
Mike Christie7996a772006-04-06 21:13:41 -0500291 /* control data */
292 struct iscsi_transport *tt;
293 struct Scsi_Host *host;
294 struct iscsi_conn *leadconn; /* leading connection */
295 spinlock_t lock; /* protects session state, *
296 * sequence numbers, *
297 * session resources: *
298 * - cmdpool, *
299 * - mgmtpool, *
300 * - r2tpool */
301 int state; /* session state */
Mike Christie7996a772006-04-06 21:13:41 -0500302 int age; /* counts session re-opens */
303
Mike Christie3e5c28a2008-05-21 15:54:06 -0500304 int scsi_cmds_max; /* max scsi commands */
Mike Christie7996a772006-04-06 21:13:41 -0500305 int cmds_max; /* size of cmds array */
Mike Christie9c19a7d2008-05-21 15:54:09 -0500306 struct iscsi_task **cmds; /* Original Cmds arr */
Olaf Kirch63203772007-12-13 12:43:25 -0600307 struct iscsi_pool cmdpool; /* PDU's pool */
Jayamohan Kallickalb8b9e1b82009-09-22 08:21:22 +0530308 void *dd_data; /* LLD private data */
Mike Christie7996a772006-04-06 21:13:41 -0500309};
310
Mike Christiee5bd7b52008-09-24 11:46:10 -0500311enum {
312 ISCSI_HOST_SETUP,
313 ISCSI_HOST_REMOVED,
314};
315
Mike Christie75613522008-05-21 15:53:59 -0500316struct iscsi_host {
317 char *initiatorname;
318 /* hw address or netdev iscsi connection is bound to */
319 char *hwaddress;
320 char *netdev;
321 /* local address */
322 int local_port;
323 char local_address[ISCSI_ADDRESS_BUF_LEN];
Mike Christiee5bd7b52008-09-24 11:46:10 -0500324
325 wait_queue_head_t session_removal_wq;
326 /* protects sessions and state */
327 spinlock_t lock;
328 int num_sessions;
329 int state;
Mike Christie32ae7632009-03-05 14:46:03 -0600330
331 struct workqueue_struct *workq;
332 char workq_name[20];
Mike Christie75613522008-05-21 15:53:59 -0500333};
334
Mike Christie7996a772006-04-06 21:13:41 -0500335/*
336 * scsi host template
337 */
Mike Christiee881a172009-10-15 17:46:39 -0700338extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth,
339 int reason);
Mike Christie7996a772006-04-06 21:13:41 -0500340extern int iscsi_eh_abort(struct scsi_cmnd *sc);
Jayamohan Kallickal309ce152010-02-20 08:02:10 +0530341extern int iscsi_eh_recover_target(struct scsi_cmnd *sc);
342extern int iscsi_eh_session_reset(struct scsi_cmnd *sc);
Mike Christie843c0a82007-12-13 12:43:20 -0600343extern int iscsi_eh_device_reset(struct scsi_cmnd *sc);
Mike Christie7996a772006-04-06 21:13:41 -0500344extern int iscsi_queuecommand(struct scsi_cmnd *sc,
345 void (*done)(struct scsi_cmnd *));
346
Mike Christie0801c242007-05-30 12:57:12 -0500347/*
348 * iSCSI host helpers.
349 */
Mike Christie5d91e202008-05-21 15:54:01 -0500350#define iscsi_host_priv(_shost) \
351 (shost_priv(_shost) + sizeof(struct iscsi_host))
352
Mike Christie0801c242007-05-30 12:57:12 -0500353extern int iscsi_host_set_param(struct Scsi_Host *shost,
354 enum iscsi_host_param param, char *buf,
355 int buflen);
356extern int iscsi_host_get_param(struct Scsi_Host *shost,
357 enum iscsi_host_param param, char *buf);
Mike Christiea4804cd2008-05-21 15:54:00 -0500358extern int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev);
359extern struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
Mike Christie4d108352009-03-05 14:46:04 -0600360 int dd_data_size,
Mike Christie32ae7632009-03-05 14:46:03 -0600361 bool xmit_can_sleep);
Mike Christiea4804cd2008-05-21 15:54:00 -0500362extern void iscsi_host_remove(struct Scsi_Host *shost);
363extern void iscsi_host_free(struct Scsi_Host *shost);
Mike Christie6b5d6c42009-04-21 15:32:32 -0500364extern int iscsi_target_alloc(struct scsi_target *starget);
Mike Christie0801c242007-05-30 12:57:12 -0500365
Mike Christie7996a772006-04-06 21:13:41 -0500366/*
367 * session management
368 */
369extern struct iscsi_cls_session *
Mike Christie75613522008-05-21 15:53:59 -0500370iscsi_session_setup(struct iscsi_transport *, struct Scsi_Host *shost,
Jayamohan Kallickalb8b9e1b82009-09-22 08:21:22 +0530371 uint16_t, int, int, uint32_t, unsigned int);
Mike Christie7996a772006-04-06 21:13:41 -0500372extern void iscsi_session_teardown(struct iscsi_cls_session *);
Mike Christie7996a772006-04-06 21:13:41 -0500373extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
Mike Christiea54a52c2006-06-28 12:00:23 -0500374extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
375 enum iscsi_param param, char *buf, int buflen);
376extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
377 enum iscsi_param param, char *buf);
Mike Christie7996a772006-04-06 21:13:41 -0500378
Mike Christie322d7392008-01-31 13:36:52 -0600379#define iscsi_session_printk(prefix, _sess, fmt, a...) \
Mike Christie75613522008-05-21 15:53:59 -0500380 iscsi_cls_session_printk(prefix, _sess->cls_session, fmt, ##a)
Mike Christie322d7392008-01-31 13:36:52 -0600381
Mike Christie7996a772006-04-06 21:13:41 -0500382/*
383 * connection management
384 */
385extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *,
Mike Christie5d91e202008-05-21 15:54:01 -0500386 int, uint32_t);
Mike Christie7996a772006-04-06 21:13:41 -0500387extern void iscsi_conn_teardown(struct iscsi_cls_conn *);
388extern int iscsi_conn_start(struct iscsi_cls_conn *);
389extern void iscsi_conn_stop(struct iscsi_cls_conn *, int);
390extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *,
391 int);
392extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err);
Mike Christie40a06e72009-03-05 14:46:05 -0600393extern void iscsi_session_failure(struct iscsi_session *session,
Mike Christiee5bd7b52008-09-24 11:46:10 -0500394 enum iscsi_err err);
Mike Christiea54a52c2006-06-28 12:00:23 -0500395extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
396 enum iscsi_param param, char *buf);
Mike Christie5af3e912008-05-21 15:54:02 -0500397extern void iscsi_suspend_tx(struct iscsi_conn *conn);
Mike Christie661134a2009-09-05 07:35:33 +0530398extern void iscsi_suspend_queue(struct iscsi_conn *conn);
Mike Christie32ae7632009-03-05 14:46:03 -0600399extern void iscsi_conn_queue_work(struct iscsi_conn *conn);
Mike Christie7996a772006-04-06 21:13:41 -0500400
Mike Christie322d7392008-01-31 13:36:52 -0600401#define iscsi_conn_printk(prefix, _c, fmt, a...) \
Mike Christie5af3e912008-05-21 15:54:02 -0500402 iscsi_cls_conn_printk(prefix, ((struct iscsi_conn *)_c)->cls_conn, \
403 fmt, ##a)
Mike Christie322d7392008-01-31 13:36:52 -0600404
Mike Christie7996a772006-04-06 21:13:41 -0500405/*
406 * pdu and task processing
407 */
Mike Christie77a23c22007-05-30 12:57:18 -0500408extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *);
Mike Christie577577d2008-12-02 00:32:05 -0600409extern void iscsi_prep_data_out_pdu(struct iscsi_task *task,
410 struct iscsi_r2t_info *r2t,
411 struct iscsi_data *hdr);
Mike Christie7996a772006-04-06 21:13:41 -0500412extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *,
413 char *, uint32_t);
414extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
415 char *, int);
Mike Christie913e5bf2008-05-21 15:54:18 -0500416extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
417 char *, int);
Mike Christie0af967f2008-05-21 15:54:04 -0500418extern int iscsi_verify_itt(struct iscsi_conn *, itt_t);
Mike Christie9c19a7d2008-05-21 15:54:09 -0500419extern struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *, itt_t);
Mike Christie8f9256c2009-05-13 17:57:41 -0500420extern struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *, itt_t);
Mike Christie9c19a7d2008-05-21 15:54:09 -0500421extern void iscsi_requeue_task(struct iscsi_task *task);
422extern void iscsi_put_task(struct iscsi_task *task);
Mike Christie913e5bf2008-05-21 15:54:18 -0500423extern void __iscsi_get_task(struct iscsi_task *task);
Mike Christie4c0ba5d2009-09-05 07:34:23 +0530424extern void iscsi_complete_scsi_task(struct iscsi_task *task,
425 uint32_t exp_cmdsn, uint32_t max_cmdsn);
Mike Christie7996a772006-04-06 21:13:41 -0500426
427/*
428 * generic helpers
429 */
Olaf Kirch63203772007-12-13 12:43:25 -0600430extern void iscsi_pool_free(struct iscsi_pool *);
431extern int iscsi_pool_init(struct iscsi_pool *, int, void ***, int);
Mike Christie7996a772006-04-06 21:13:41 -0500432
Boaz Harrosh004d6532007-12-13 12:43:23 -0600433/*
434 * inline functions to deal with padding.
435 */
436static inline unsigned int
437iscsi_padded(unsigned int len)
438{
439 return (len + ISCSI_PAD_LEN - 1) & ~(ISCSI_PAD_LEN - 1);
440}
441
442static inline unsigned int
443iscsi_padding(unsigned int len)
444{
445 len &= (ISCSI_PAD_LEN - 1);
446 if (len)
447 len = ISCSI_PAD_LEN - len;
448 return len;
449}
450
Mike Christie7996a772006-04-06 21:13:41 -0500451#endif