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Linux/include/scsi/libiscsi.h

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  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>
 27 #include <linux/wait.h>
 28 #include <linux/mutex.h>
 29 #include <linux/timer.h>
 30 #include <linux/workqueue.h>
 31 #include <linux/kfifo.h>
 32 #include <scsi/iscsi_proto.h>
 33 #include <scsi/iscsi_if.h>
 34 #include <scsi/scsi_transport_iscsi.h>
 35 
 36 struct scsi_transport_template;
 37 struct scsi_host_template;
 38 struct scsi_device;
 39 struct Scsi_Host;
 40 struct scsi_target;
 41 struct scsi_cmnd;
 42 struct socket;
 43 struct iscsi_transport;
 44 struct iscsi_cls_session;
 45 struct iscsi_cls_conn;
 46 struct iscsi_session;
 47 struct iscsi_nopin;
 48 struct device;
 49 
 50 #define ISCSI_DEF_XMIT_CMDS_MAX 128     /* must be power of 2 */
 51 #define ISCSI_MGMT_CMDS_MAX     15
 52 
 53 #define ISCSI_DEF_CMD_PER_LUN   32
 54 
 55 /* Task Mgmt states */
 56 enum {
 57         TMF_INITIAL,
 58         TMF_QUEUED,
 59         TMF_SUCCESS,
 60         TMF_FAILED,
 61         TMF_TIMEDOUT,
 62         TMF_NOT_FOUND,
 63 };
 64 
 65 /* Connection suspend "bit" */
 66 #define ISCSI_SUSPEND_BIT               1
 67 
 68 #define ISCSI_ITT_MASK                  0x1fff
 69 #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
 72 #define ISCSI_AGE_SHIFT                 28
 73 #define ISCSI_AGE_MASK                  0xf
 74 
 75 #define ISCSI_ADDRESS_BUF_LEN           64
 76 
 77 enum {
 78         /* this is the maximum possible storage for AHSs */
 79         ISCSI_MAX_AHS_SIZE = sizeof(struct iscsi_ecdb_ahdr) +
 80                                 sizeof(struct iscsi_rlength_ahdr),
 81         ISCSI_DIGEST_SIZE = sizeof(__u32),
 82 };
 83 
 84 
 85 enum {
 86         ISCSI_TASK_FREE,
 87         ISCSI_TASK_COMPLETED,
 88         ISCSI_TASK_PENDING,
 89         ISCSI_TASK_RUNNING,
 90         ISCSI_TASK_ABRT_TMF,            /* aborted due to TMF */
 91         ISCSI_TASK_ABRT_SESS_RECOV,     /* aborted due to session recovery */
 92         ISCSI_TASK_REQUEUE_SCSIQ,       /* qcmd requeueing to scsi-ml */
 93 };
 94 
 95 struct iscsi_r2t_info {
 96         __be32                  ttt;            /* copied from R2T */
 97         __be32                  exp_statsn;     /* copied from R2T */
 98         uint32_t                data_length;    /* copied from R2T */
 99         uint32_t                data_offset;    /* copied from R2T */
100         int                     data_count;     /* DATA-Out payload progress */
101         int                     datasn;
102         /* LLDs should set/update these values */
103         int                     sent;           /* R2T sequence progress */
104 };
105 
106 struct iscsi_task {
107         /*
108          * Because LLDs allocate their hdr differently, this is a pointer
109          * and length to that storage. It must be setup at session
110          * creation time.
111          */
112         struct iscsi_hdr        *hdr;
113         unsigned short          hdr_max;
114         unsigned short          hdr_len;        /* accumulated size of hdr used */
115         /* copied values in case we need to send tmfs */
116         itt_t                   hdr_itt;
117         __be32                  cmdsn;
118         struct scsi_lun         lun;
119 
120         int                     itt;            /* this ITT */
121 
122         unsigned                imm_count;      /* imm-data (bytes)   */
123         /* offset in unsolicited stream (bytes); */
124         struct iscsi_r2t_info   unsol_r2t;
125         char                    *data;          /* mgmt payload */
126         unsigned                data_count;
127         struct scsi_cmnd        *sc;            /* associated SCSI cmd*/
128         struct iscsi_conn       *conn;          /* used connection    */
129 
130         /* data processing tracking */
131         unsigned long           last_xfer;
132         unsigned long           last_timeout;
133         bool                    have_checked_conn;
134         /* state set/tested under session->lock */
135         int                     state;
136         atomic_t                refcount;
137         struct list_head        running;        /* running cmd list */
138         void                    *dd_data;       /* driver/transport data */
139 };
140 
141 static inline int iscsi_task_has_unsol_data(struct iscsi_task *task)
142 {
143         return task->unsol_r2t.data_length > task->unsol_r2t.sent;
144 }
145 
146 static inline void* iscsi_next_hdr(struct iscsi_task *task)
147 {
148         return (void*)task->hdr + task->hdr_len;
149 }
150 
151 /* Connection's states */
152 enum {
153         ISCSI_CONN_INITIAL_STAGE,
154         ISCSI_CONN_STARTED,
155         ISCSI_CONN_STOPPED,
156         ISCSI_CONN_CLEANUP_WAIT,
157 };
158 
159 struct iscsi_conn {
160         struct iscsi_cls_conn   *cls_conn;      /* ptr to class connection */
161         void                    *dd_data;       /* iscsi_transport data */
162         struct iscsi_session    *session;       /* parent session */
163         /*
164          * conn_stop() flag: stop to recover, stop to terminate
165          */
166         int                     stop_stage;
167         struct timer_list       transport_timer;
168         unsigned long           last_recv;
169         unsigned long           last_ping;
170         int                     ping_timeout;
171         int                     recv_timeout;
172         struct iscsi_task       *ping_task;
173 
174         /* iSCSI connection-wide sequencing */
175         uint32_t                exp_statsn;
176 
177         /* control data */
178         int                     id;             /* CID */
179         int                     c_stage;        /* connection state */
180         /*
181          * Preallocated buffer for pdus that have data but do not
182          * originate from scsi-ml. We never have two pdus using the
183          * buffer at the same time. It is only allocated to
184          * the default max recv size because the pdus we support
185          * should always fit in this buffer
186          */
187         char                    *data;
188         struct iscsi_task       *login_task;    /* mtask used for login/text */
189         struct iscsi_task       *task;          /* xmit task in progress */
190 
191         /* xmit */
192         struct list_head        mgmtqueue;      /* mgmt (control) xmit queue */
193         struct list_head        cmdqueue;       /* data-path cmd queue */
194         struct list_head        requeue;        /* tasks needing another run */
195         struct work_struct      xmitwork;       /* per-conn. xmit workqueue */
196         unsigned long           suspend_tx;     /* suspend Tx */
197         unsigned long           suspend_rx;     /* suspend Rx */
198 
199         /* abort */
200         wait_queue_head_t       ehwait;         /* used in eh_abort() */
201         struct iscsi_tm         tmhdr;
202         struct timer_list       tmf_timer;
203         int                     tmf_state;      /* see TMF_INITIAL, etc.*/
204 
205         /* negotiated params */
206         unsigned                max_recv_dlength; /* initiator_max_recv_dsl*/
207         unsigned                max_xmit_dlength; /* target_max_recv_dsl */
208         int                     hdrdgst_en;
209         int                     datadgst_en;
210         int                     ifmarker_en;
211         int                     ofmarker_en;
212         /* values userspace uses to id a conn */
213         int                     persistent_port;
214         char                    *persistent_address;
215 
216         /* MIB-statistics */
217         uint64_t                txdata_octets;
218         uint64_t                rxdata_octets;
219         uint32_t                scsicmd_pdus_cnt;
220         uint32_t                dataout_pdus_cnt;
221         uint32_t                scsirsp_pdus_cnt;
222         uint32_t                datain_pdus_cnt;
223         uint32_t                r2t_pdus_cnt;
224         uint32_t                tmfcmd_pdus_cnt;
225         int32_t                 tmfrsp_pdus_cnt;
226 
227         /* custom statistics */
228         uint32_t                eh_abort_cnt;
229         uint32_t                fmr_unalign_cnt;
230 };
231 
232 struct iscsi_pool {
233         struct kfifo            queue;          /* FIFO Queue */
234         void                    **pool;         /* Pool of elements */
235         int                     max;            /* Max number of elements */
236 };
237 
238 /* Session's states */
239 enum {
240         ISCSI_STATE_FREE = 1,
241         ISCSI_STATE_LOGGED_IN,
242         ISCSI_STATE_FAILED,
243         ISCSI_STATE_TERMINATE,
244         ISCSI_STATE_IN_RECOVERY,
245         ISCSI_STATE_RECOVERY_FAILED,
246         ISCSI_STATE_LOGGING_OUT,
247 };
248 
249 struct iscsi_session {
250         struct iscsi_cls_session *cls_session;
251         /*
252          * Syncs up the scsi eh thread with the iscsi eh thread when sending
253          * task management functions. This must be taken before the session
254          * and recv lock.
255          */
256         struct mutex            eh_mutex;
257 
258         /* iSCSI session-wide sequencing */
259         uint32_t                cmdsn;
260         uint32_t                exp_cmdsn;
261         uint32_t                max_cmdsn;
262 
263         /* This tracks the reqs queued into the initiator */
264         uint32_t                queued_cmdsn;
265 
266         /* configuration */
267         int                     abort_timeout;
268         int                     lu_reset_timeout;
269         int                     tgt_reset_timeout;
270         int                     initial_r2t_en;
271         unsigned short          max_r2t;
272         int                     imm_data_en;
273         unsigned                first_burst;
274         unsigned                max_burst;
275         int                     time2wait;
276         int                     time2retain;
277         int                     pdu_inorder_en;
278         int                     dataseq_inorder_en;
279         int                     erl;
280         int                     fast_abort;
281         int                     tpgt;
282         char                    *username;
283         char                    *username_in;
284         char                    *password;
285         char                    *password_in;
286         char                    *targetname;
287         char                    *targetalias;
288         char                    *ifacename;
289         char                    *initiatorname;
290         /* control data */
291         struct iscsi_transport  *tt;
292         struct Scsi_Host        *host;
293         struct iscsi_conn       *leadconn;      /* leading connection */
294         spinlock_t              lock;           /* protects session state, *
295                                                  * sequence numbers,       *
296                                                  * session resources:      *
297                                                  * - cmdpool,              *
298                                                  * - mgmtpool,             *
299                                                  * - r2tpool               */
300         int                     state;          /* session state           */
301         int                     age;            /* counts session re-opens */
302 
303         int                     scsi_cmds_max;  /* max scsi commands */
304         int                     cmds_max;       /* size of cmds array */
305         struct iscsi_task       **cmds;         /* Original Cmds arr */
306         struct iscsi_pool       cmdpool;        /* PDU's pool */
307         void                    *dd_data;       /* LLD private data */
308 };
309 
310 enum {
311         ISCSI_HOST_SETUP,
312         ISCSI_HOST_REMOVED,
313 };
314 
315 struct iscsi_host {
316         char                    *initiatorname;
317         /* hw address or netdev iscsi connection is bound to */
318         char                    *hwaddress;
319         char                    *netdev;
320 
321         wait_queue_head_t       session_removal_wq;
322         /* protects sessions and state */
323         spinlock_t              lock;
324         int                     num_sessions;
325         int                     state;
326 
327         struct workqueue_struct *workq;
328         char                    workq_name[20];
329 };
330 
331 /*
332  * scsi host template
333  */
334 extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth,
335                                     int reason);
336 extern int iscsi_eh_abort(struct scsi_cmnd *sc);
337 extern int iscsi_eh_recover_target(struct scsi_cmnd *sc);
338 extern int iscsi_eh_session_reset(struct scsi_cmnd *sc);
339 extern int iscsi_eh_device_reset(struct scsi_cmnd *sc);
340 extern int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc);
341 
342 /*
343  * iSCSI host helpers.
344  */
345 #define iscsi_host_priv(_shost) \
346         (shost_priv(_shost) + sizeof(struct iscsi_host))
347 
348 extern int iscsi_host_set_param(struct Scsi_Host *shost,
349                                 enum iscsi_host_param param, char *buf,
350                                 int buflen);
351 extern int iscsi_host_get_param(struct Scsi_Host *shost,
352                                 enum iscsi_host_param param, char *buf);
353 extern int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev);
354 extern struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
355                                           int dd_data_size,
356                                           bool xmit_can_sleep);
357 extern void iscsi_host_remove(struct Scsi_Host *shost);
358 extern void iscsi_host_free(struct Scsi_Host *shost);
359 extern int iscsi_target_alloc(struct scsi_target *starget);
360 
361 /*
362  * session management
363  */
364 extern struct iscsi_cls_session *
365 iscsi_session_setup(struct iscsi_transport *, struct Scsi_Host *shost,
366                     uint16_t, int, int, uint32_t, unsigned int);
367 extern void iscsi_session_teardown(struct iscsi_cls_session *);
368 extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
369 extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
370                            enum iscsi_param param, char *buf, int buflen);
371 extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
372                                    enum iscsi_param param, char *buf);
373 
374 #define iscsi_session_printk(prefix, _sess, fmt, a...)  \
375         iscsi_cls_session_printk(prefix, _sess->cls_session, fmt, ##a)
376 
377 /*
378  * connection management
379  */
380 extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *,
381                                                int, uint32_t);
382 extern void iscsi_conn_teardown(struct iscsi_cls_conn *);
383 extern int iscsi_conn_start(struct iscsi_cls_conn *);
384 extern void iscsi_conn_stop(struct iscsi_cls_conn *, int);
385 extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *,
386                            int);
387 extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err);
388 extern void iscsi_session_failure(struct iscsi_session *session,
389                                   enum iscsi_err err);
390 extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
391                                 enum iscsi_param param, char *buf);
392 extern int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
393                                      enum iscsi_param param, char *buf);
394 extern void iscsi_suspend_tx(struct iscsi_conn *conn);
395 extern void iscsi_suspend_queue(struct iscsi_conn *conn);
396 extern void iscsi_conn_queue_work(struct iscsi_conn *conn);
397 
398 #define iscsi_conn_printk(prefix, _c, fmt, a...) \
399         iscsi_cls_conn_printk(prefix, ((struct iscsi_conn *)_c)->cls_conn, \
400                               fmt, ##a)
401 
402 /*
403  * pdu and task processing
404  */
405 extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *);
406 extern void iscsi_prep_data_out_pdu(struct iscsi_task *task,
407                                     struct iscsi_r2t_info *r2t,
408                                     struct iscsi_data *hdr);
409 extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *,
410                                 char *, uint32_t);
411 extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
412                               char *, int);
413 extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
414                                 char *, int);
415 extern int iscsi_verify_itt(struct iscsi_conn *, itt_t);
416 extern struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *, itt_t);
417 extern struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *, itt_t);
418 extern void iscsi_requeue_task(struct iscsi_task *task);
419 extern void iscsi_put_task(struct iscsi_task *task);
420 extern void __iscsi_put_task(struct iscsi_task *task);
421 extern void __iscsi_get_task(struct iscsi_task *task);
422 extern void iscsi_complete_scsi_task(struct iscsi_task *task,
423                                      uint32_t exp_cmdsn, uint32_t max_cmdsn);
424 
425 /*
426  * generic helpers
427  */
428 extern void iscsi_pool_free(struct iscsi_pool *);
429 extern int iscsi_pool_init(struct iscsi_pool *, int, void ***, int);
430 
431 /*
432  * inline functions to deal with padding.
433  */
434 static inline unsigned int
435 iscsi_padded(unsigned int len)
436 {
437         return (len + ISCSI_PAD_LEN - 1) & ~(ISCSI_PAD_LEN - 1);
438 }
439 
440 static inline unsigned int
441 iscsi_padding(unsigned int len)
442 {
443         len &= (ISCSI_PAD_LEN - 1);
444         if (len)
445                 len = ISCSI_PAD_LEN - len;
446         return len;
447 }
448 
449 #endif
450 

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