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TOMOYO Linux Cross Reference
Linux/include/scsi/scsi_transport_iscsi.h

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  1 /*
  2  * iSCSI transport class definitions
  3  *
  4  * Copyright (C) IBM Corporation, 2004
  5  * Copyright (C) Mike Christie, 2004 - 2006
  6  * Copyright (C) Dmitry Yusupov, 2004 - 2005
  7  * Copyright (C) Alex Aizman, 2004 - 2005
  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 SCSI_TRANSPORT_ISCSI_H
 24 #define SCSI_TRANSPORT_ISCSI_H
 25 
 26 #include <linux/device.h>
 27 #include <linux/list.h>
 28 #include <linux/mutex.h>
 29 #include <scsi/iscsi_if.h>
 30 
 31 struct scsi_transport_template;
 32 struct iscsi_transport;
 33 struct iscsi_endpoint;
 34 struct Scsi_Host;
 35 struct scsi_cmnd;
 36 struct iscsi_cls_conn;
 37 struct iscsi_conn;
 38 struct iscsi_task;
 39 struct sockaddr;
 40 struct iscsi_iface;
 41 struct bsg_job;
 42 struct iscsi_bus_flash_session;
 43 struct iscsi_bus_flash_conn;
 44 
 45 /**
 46  * struct iscsi_transport - iSCSI Transport template
 47  *
 48  * @name:               transport name
 49  * @caps:               iSCSI Data-Path capabilities
 50  * @create_session:     create new iSCSI session object
 51  * @destroy_session:    destroy existing iSCSI session object
 52  * @create_conn:        create new iSCSI connection
 53  * @bind_conn:          associate this connection with existing iSCSI session
 54  *                      and specified transport descriptor
 55  * @destroy_conn:       destroy inactive iSCSI connection
 56  * @set_param:          set iSCSI parameter. Return 0 on success, -ENODATA
 57  *                      when param is not supported, and a -Exx value on other
 58  *                      error.
 59  * @get_param           get iSCSI parameter. Must return number of bytes
 60  *                      copied to buffer on success, -ENODATA when param
 61  *                      is not supported, and a -Exx value on other error
 62  * @start_conn:         set connection to be operational
 63  * @stop_conn:          suspend/recover/terminate connection
 64  * @send_pdu:           send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text.
 65  * @session_recovery_timedout: notify LLD a block during recovery timed out
 66  * @init_task:          Initialize a iscsi_task and any internal structs.
 67  *                      When offloading the data path, this is called from
 68  *                      queuecommand with the session lock, or from the
 69  *                      iscsi_conn_send_pdu context with the session lock.
 70  *                      When not offloading the data path, this is called
 71  *                      from the scsi work queue without the session lock.
 72  * @xmit_task           Requests LLD to transfer cmd task. Returns 0 or the
 73  *                      the number of bytes transferred on success, and -Exyz
 74  *                      value on error. When offloading the data path, this
 75  *                      is called from queuecommand with the session lock, or
 76  *                      from the iscsi_conn_send_pdu context with the session
 77  *                      lock. When not offloading the data path, this is called
 78  *                      from the scsi work queue without the session lock.
 79  * @cleanup_task:       requests LLD to fail task. Called with session lock
 80  *                      and after the connection has been suspended and
 81  *                      terminated during recovery. If called
 82  *                      from abort task then connection is not suspended
 83  *                      or terminated but sk_callback_lock is held
 84  *
 85  * Template API provided by iSCSI Transport
 86  */
 87 struct iscsi_transport {
 88         struct module *owner;
 89         char *name;
 90         unsigned int caps;
 91 
 92         struct iscsi_cls_session *(*create_session) (struct iscsi_endpoint *ep,
 93                                         uint16_t cmds_max, uint16_t qdepth,
 94                                         uint32_t sn);
 95         void (*destroy_session) (struct iscsi_cls_session *session);
 96         struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess,
 97                                 uint32_t cid);
 98         int (*bind_conn) (struct iscsi_cls_session *session,
 99                           struct iscsi_cls_conn *cls_conn,
100                           uint64_t transport_eph, int is_leading);
101         int (*start_conn) (struct iscsi_cls_conn *conn);
102         void (*stop_conn) (struct iscsi_cls_conn *conn, int flag);
103         void (*destroy_conn) (struct iscsi_cls_conn *conn);
104         int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param,
105                           char *buf, int buflen);
106         int (*get_ep_param) (struct iscsi_endpoint *ep, enum iscsi_param param,
107                              char *buf);
108         int (*get_conn_param) (struct iscsi_cls_conn *conn,
109                                enum iscsi_param param, char *buf);
110         int (*get_session_param) (struct iscsi_cls_session *session,
111                                   enum iscsi_param param, char *buf);
112         int (*get_host_param) (struct Scsi_Host *shost,
113                                 enum iscsi_host_param param, char *buf);
114         int (*set_host_param) (struct Scsi_Host *shost,
115                                enum iscsi_host_param param, char *buf,
116                                int buflen);
117         int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
118                          char *data, uint32_t data_size);
119         void (*get_stats) (struct iscsi_cls_conn *conn,
120                            struct iscsi_stats *stats);
121 
122         int (*init_task) (struct iscsi_task *task);
123         int (*xmit_task) (struct iscsi_task *task);
124         void (*cleanup_task) (struct iscsi_task *task);
125 
126         int (*alloc_pdu) (struct iscsi_task *task, uint8_t opcode);
127         int (*xmit_pdu) (struct iscsi_task *task);
128         int (*init_pdu) (struct iscsi_task *task, unsigned int offset,
129                          unsigned int count);
130         void (*parse_pdu_itt) (struct iscsi_conn *conn, itt_t itt,
131                                int *index, int *age);
132 
133         void (*session_recovery_timedout) (struct iscsi_cls_session *session);
134         struct iscsi_endpoint *(*ep_connect) (struct Scsi_Host *shost,
135                                               struct sockaddr *dst_addr,
136                                               int non_blocking);
137         int (*ep_poll) (struct iscsi_endpoint *ep, int timeout_ms);
138         void (*ep_disconnect) (struct iscsi_endpoint *ep);
139         int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type,
140                           uint32_t enable, struct sockaddr *dst_addr);
141         int (*set_path) (struct Scsi_Host *shost, struct iscsi_path *params);
142         int (*set_iface_param) (struct Scsi_Host *shost, void *data,
143                                 uint32_t len);
144         int (*get_iface_param) (struct iscsi_iface *iface,
145                                 enum iscsi_param_type param_type,
146                                 int param, char *buf);
147         umode_t (*attr_is_visible)(int param_type, int param);
148         int (*bsg_request)(struct bsg_job *job);
149         int (*send_ping) (struct Scsi_Host *shost, uint32_t iface_num,
150                           uint32_t iface_type, uint32_t payload_size,
151                           uint32_t pid, struct sockaddr *dst_addr);
152         int (*get_chap) (struct Scsi_Host *shost, uint16_t chap_tbl_idx,
153                          uint32_t *num_entries, char *buf);
154         int (*delete_chap) (struct Scsi_Host *shost, uint16_t chap_tbl_idx);
155         int (*set_chap) (struct Scsi_Host *shost, void *data, int len);
156         int (*get_flashnode_param) (struct iscsi_bus_flash_session *fnode_sess,
157                                     int param, char *buf);
158         int (*set_flashnode_param) (struct iscsi_bus_flash_session *fnode_sess,
159                                     struct iscsi_bus_flash_conn *fnode_conn,
160                                     void *data, int len);
161         int (*new_flashnode) (struct Scsi_Host *shost, const char *buf,
162                               int len);
163         int (*del_flashnode) (struct iscsi_bus_flash_session *fnode_sess);
164         int (*login_flashnode) (struct iscsi_bus_flash_session *fnode_sess,
165                                 struct iscsi_bus_flash_conn *fnode_conn);
166         int (*logout_flashnode) (struct iscsi_bus_flash_session *fnode_sess,
167                                  struct iscsi_bus_flash_conn *fnode_conn);
168         int (*logout_flashnode_sid) (struct iscsi_cls_session *cls_sess);
169         int (*get_host_stats) (struct Scsi_Host *shost, char *buf, int len);
170         u8 (*check_protection)(struct iscsi_task *task, sector_t *sector);
171 };
172 
173 /*
174  * transport registration upcalls
175  */
176 extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt);
177 extern int iscsi_unregister_transport(struct iscsi_transport *tt);
178 
179 /*
180  * control plane upcalls
181  */
182 extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn,
183                                    enum iscsi_err error);
184 extern void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
185                                    enum iscsi_conn_state state);
186 extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
187                           char *data, uint32_t data_size);
188 
189 extern int iscsi_offload_mesg(struct Scsi_Host *shost,
190                               struct iscsi_transport *transport, uint32_t type,
191                               char *data, uint16_t data_size);
192 
193 extern void iscsi_post_host_event(uint32_t host_no,
194                                   struct iscsi_transport *transport,
195                                   enum iscsi_host_event_code code,
196                                   uint32_t data_size,
197                                   uint8_t *data);
198 
199 extern void iscsi_ping_comp_event(uint32_t host_no,
200                                   struct iscsi_transport *transport,
201                                   uint32_t status, uint32_t pid,
202                                   uint32_t data_size, uint8_t *data);
203 
204 struct iscsi_cls_conn {
205         struct list_head conn_list;     /* item in connlist */
206         void *dd_data;                  /* LLD private data */
207         struct iscsi_transport *transport;
208         uint32_t cid;                   /* connection id */
209         struct mutex ep_mutex;
210         struct iscsi_endpoint *ep;
211 
212         struct device dev;              /* sysfs transport/container device */
213 };
214 
215 #define iscsi_dev_to_conn(_dev) \
216         container_of(_dev, struct iscsi_cls_conn, dev)
217 
218 #define transport_class_to_conn(_cdev) \
219         iscsi_dev_to_conn(_cdev->parent)
220 
221 #define iscsi_conn_to_session(_conn) \
222         iscsi_dev_to_session(_conn->dev.parent)
223 
224 /* iscsi class session state */
225 enum {
226         ISCSI_SESSION_LOGGED_IN,
227         ISCSI_SESSION_FAILED,
228         ISCSI_SESSION_FREE,
229 };
230 
231 #define ISCSI_MAX_TARGET -1
232 
233 struct iscsi_cls_session {
234         struct list_head sess_list;             /* item in session_list */
235         struct iscsi_transport *transport;
236         spinlock_t lock;
237         struct work_struct block_work;
238         struct work_struct unblock_work;
239         struct work_struct scan_work;
240         struct work_struct unbind_work;
241 
242         /* recovery fields */
243         int recovery_tmo;
244         bool recovery_tmo_sysfs_override;
245         struct delayed_work recovery_work;
246 
247         unsigned int target_id;
248         bool ida_used;
249 
250         /*
251          * pid of userspace process that created session or -1 if
252          * created by the kernel.
253          */
254         pid_t creator;
255         int state;
256         int sid;                                /* session id */
257         void *dd_data;                          /* LLD private data */
258         struct device dev;      /* sysfs transport/container device */
259 };
260 
261 #define iscsi_dev_to_session(_dev) \
262         container_of(_dev, struct iscsi_cls_session, dev)
263 
264 #define transport_class_to_session(_cdev) \
265         iscsi_dev_to_session(_cdev->parent)
266 
267 #define iscsi_session_to_shost(_session) \
268         dev_to_shost(_session->dev.parent)
269 
270 #define starget_to_session(_stgt) \
271         iscsi_dev_to_session(_stgt->dev.parent)
272 
273 struct iscsi_cls_host {
274         atomic_t nr_scans;
275         struct mutex mutex;
276         struct request_queue *bsg_q;
277         uint32_t port_speed;
278         uint32_t port_state;
279 };
280 
281 #define iscsi_job_to_shost(_job) \
282         dev_to_shost(_job->dev)
283 
284 extern void iscsi_host_for_each_session(struct Scsi_Host *shost,
285                                 void (*fn)(struct iscsi_cls_session *));
286 
287 struct iscsi_endpoint {
288         void *dd_data;                  /* LLD private data */
289         struct device dev;
290         uint64_t id;
291         struct iscsi_cls_conn *conn;
292 };
293 
294 struct iscsi_iface {
295         struct device dev;
296         struct iscsi_transport *transport;
297         uint32_t iface_type;    /* IPv4 or IPv6 */
298         uint32_t iface_num;     /* iface number, 0 - n */
299         void *dd_data;          /* LLD private data */
300 };
301 
302 #define iscsi_dev_to_iface(_dev) \
303         container_of(_dev, struct iscsi_iface, dev)
304 
305 #define iscsi_iface_to_shost(_iface) \
306         dev_to_shost(_iface->dev.parent)
307 
308 
309 struct iscsi_bus_flash_conn {
310         struct list_head conn_list;     /* item in connlist */
311         void *dd_data;                  /* LLD private data */
312         struct iscsi_transport *transport;
313         struct device dev;              /* sysfs transport/container device */
314         /* iscsi connection parameters */
315         uint32_t                exp_statsn;
316         uint32_t                statsn;
317         unsigned                max_recv_dlength; /* initiator_max_recv_dsl*/
318         unsigned                max_xmit_dlength; /* target_max_recv_dsl */
319         unsigned                max_segment_size;
320         unsigned                tcp_xmit_wsf;
321         unsigned                tcp_recv_wsf;
322         int                     hdrdgst_en;
323         int                     datadgst_en;
324         int                     port;
325         char                    *ipaddress;
326         char                    *link_local_ipv6_addr;
327         char                    *redirect_ipaddr;
328         uint16_t                keepalive_timeout;
329         uint16_t                local_port;
330         uint8_t                 snack_req_en;
331         /* tcp timestamp negotiation status */
332         uint8_t                 tcp_timestamp_stat;
333         uint8_t                 tcp_nagle_disable;
334         /* tcp window scale factor */
335         uint8_t                 tcp_wsf_disable;
336         uint8_t                 tcp_timer_scale;
337         uint8_t                 tcp_timestamp_en;
338         uint8_t                 ipv4_tos;
339         uint8_t                 ipv6_traffic_class;
340         uint8_t                 ipv6_flow_label;
341         uint8_t                 fragment_disable;
342         /* Link local IPv6 address is assigned by firmware or driver */
343         uint8_t                 is_fw_assigned_ipv6;
344 };
345 
346 #define iscsi_dev_to_flash_conn(_dev) \
347         container_of(_dev, struct iscsi_bus_flash_conn, dev)
348 
349 #define iscsi_flash_conn_to_flash_session(_conn) \
350         iscsi_dev_to_flash_session(_conn->dev.parent)
351 
352 #define ISID_SIZE 6
353 
354 struct iscsi_bus_flash_session {
355         struct list_head sess_list;             /* item in session_list */
356         struct iscsi_transport *transport;
357         unsigned int target_id;
358         int flash_state;        /* persistent or non-persistent */
359         void *dd_data;                          /* LLD private data */
360         struct device dev;      /* sysfs transport/container device */
361         /* iscsi session parameters */
362         unsigned                first_burst;
363         unsigned                max_burst;
364         unsigned short          max_r2t;
365         int                     default_taskmgmt_timeout;
366         int                     initial_r2t_en;
367         int                     imm_data_en;
368         int                     time2wait;
369         int                     time2retain;
370         int                     pdu_inorder_en;
371         int                     dataseq_inorder_en;
372         int                     erl;
373         int                     tpgt;
374         char                    *username;
375         char                    *username_in;
376         char                    *password;
377         char                    *password_in;
378         char                    *targetname;
379         char                    *targetalias;
380         char                    *portal_type;
381         uint16_t                tsid;
382         uint16_t                chap_in_idx;
383         uint16_t                chap_out_idx;
384         /* index of iSCSI discovery session if the entry is
385          * discovered by iSCSI discovery session
386          */
387         uint16_t                discovery_parent_idx;
388         /* indicates if discovery was done through iSNS discovery service
389          * or through sendTarget */
390         uint16_t                discovery_parent_type;
391         /* Firmware auto sendtarget discovery disable */
392         uint8_t                 auto_snd_tgt_disable;
393         uint8_t                 discovery_sess;
394         /* indicates if this flashnode entry is enabled or disabled */
395         uint8_t                 entry_state;
396         uint8_t                 chap_auth_en;
397         /* enables firmware to auto logout the discovery session on discovery
398          * completion
399          */
400         uint8_t                 discovery_logout_en;
401         uint8_t                 bidi_chap_en;
402         /* makes authentication for discovery session optional */
403         uint8_t                 discovery_auth_optional;
404         uint8_t                 isid[ISID_SIZE];
405         uint8_t                 is_boot_target;
406 };
407 
408 #define iscsi_dev_to_flash_session(_dev) \
409         container_of(_dev, struct iscsi_bus_flash_session, dev)
410 
411 #define iscsi_flash_session_to_shost(_session) \
412         dev_to_shost(_session->dev.parent)
413 
414 /*
415  * session and connection functions that can be used by HW iSCSI LLDs
416  */
417 #define iscsi_cls_session_printk(prefix, _cls_session, fmt, a...) \
418         dev_printk(prefix, &(_cls_session)->dev, fmt, ##a)
419 
420 #define iscsi_cls_conn_printk(prefix, _cls_conn, fmt, a...) \
421         dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a)
422 
423 extern int iscsi_session_chkready(struct iscsi_cls_session *session);
424 extern int iscsi_is_session_online(struct iscsi_cls_session *session);
425 extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost,
426                                 struct iscsi_transport *transport, int dd_size);
427 extern int iscsi_add_session(struct iscsi_cls_session *session,
428                              unsigned int target_id);
429 extern int iscsi_session_event(struct iscsi_cls_session *session,
430                                enum iscsi_uevent_e event);
431 extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost,
432                                                 struct iscsi_transport *t,
433                                                 int dd_size,
434                                                 unsigned int target_id);
435 extern void iscsi_remove_session(struct iscsi_cls_session *session);
436 extern void iscsi_free_session(struct iscsi_cls_session *session);
437 extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess,
438                                                 int dd_size, uint32_t cid);
439 extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
440 extern void iscsi_unblock_session(struct iscsi_cls_session *session);
441 extern void iscsi_block_session(struct iscsi_cls_session *session);
442 extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time);
443 extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size);
444 extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep);
445 extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle);
446 extern int iscsi_block_scsi_eh(struct scsi_cmnd *cmd);
447 extern struct iscsi_iface *iscsi_create_iface(struct Scsi_Host *shost,
448                                               struct iscsi_transport *t,
449                                               uint32_t iface_type,
450                                               uint32_t iface_num, int dd_size);
451 extern void iscsi_destroy_iface(struct iscsi_iface *iface);
452 extern struct iscsi_iface *iscsi_lookup_iface(int handle);
453 extern char *iscsi_get_port_speed_name(struct Scsi_Host *shost);
454 extern char *iscsi_get_port_state_name(struct Scsi_Host *shost);
455 extern int iscsi_is_session_dev(const struct device *dev);
456 
457 extern char *iscsi_get_discovery_parent_name(int parent_type);
458 extern struct device *
459 iscsi_find_flashnode(struct Scsi_Host *shost, void *data,
460                      int (*fn)(struct device *dev, void *data));
461 
462 extern struct iscsi_bus_flash_session *
463 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
464                             struct iscsi_transport *transport, int dd_size);
465 
466 extern struct iscsi_bus_flash_conn *
467 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
468                             struct iscsi_bus_flash_session *fnode_sess,
469                             struct iscsi_transport *transport, int dd_size);
470 
471 extern void
472 iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess);
473 
474 extern void iscsi_destroy_all_flashnode(struct Scsi_Host *shost);
475 extern int iscsi_flashnode_bus_match(struct device *dev,
476                                      struct device_driver *drv);
477 extern struct device *
478 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
479                           int (*fn)(struct device *dev, void *data));
480 extern struct device *
481 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess);
482 
483 extern char *
484 iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state);
485 extern char *iscsi_get_router_state_name(enum iscsi_router_state router_state);
486 #endif
487 

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