include/scsi/scsi_transport_iscsi.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * iSCSI transport class definitions
   4  *
   5  * Copyright (C) IBM Corporation, 2004
   6  * Copyright (C) Mike Christie, 2004 - 2006
   7  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   8  * Copyright (C) Alex Aizman, 2004 - 2005
   9  */
  10 #ifndef SCSI_TRANSPORT_ISCSI_H
  11 #define SCSI_TRANSPORT_ISCSI_H
  12
  13 #include <linux/device.h>
  14 #include <linux/list.h>
  15 #include <linux/mutex.h>
  16 #include <scsi/iscsi_if.h>
  17
  18 struct scsi_transport_template;
  19 struct iscsi_transport;
  20 struct iscsi_endpoint;
  21 struct Scsi_Host;
  22 struct scsi_cmnd;
  23 struct iscsi_cls_conn;
  24 struct iscsi_conn;
  25 struct iscsi_task;
  26 struct sockaddr;
  27 struct iscsi_iface;
  28 struct bsg_job;
  29 struct iscsi_bus_flash_session;
  30 struct iscsi_bus_flash_conn;
  31
  32 /**
  33  * struct iscsi_transport - iSCSI Transport template
  34  *
  35  * @name:               transport name
  36  * @caps:               iSCSI Data-Path capabilities
  37  * @create_session:     create new iSCSI session object
  38  * @destroy_session:    destroy existing iSCSI session object
  39  * @create_conn:        create new iSCSI connection
  40  * @bind_conn:          associate this connection with existing iSCSI session
  41  *                      and specified transport descriptor
  42  * @destroy_conn:       destroy inactive iSCSI connection
  43  * @set_param:          set iSCSI parameter. Return 0 on success, -ENODATA
  44  *                      when param is not supported, and a -Exx value on other
  45  *                      error.
  46  * @get_param           get iSCSI parameter. Must return number of bytes
  47  *                      copied to buffer on success, -ENODATA when param
  48  *                      is not supported, and a -Exx value on other error
  49  * @start_conn:         set connection to be operational
  50  * @stop_conn:          suspend/recover/terminate connection
  51  * @send_pdu:           send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text.
  52  * @session_recovery_timedout: notify LLD a block during recovery timed out
  53  * @init_task:          Initialize a iscsi_task and any internal structs.
  54  *                      When offloading the data path, this is called from
  55  *                      queuecommand with the session lock, or from the
  56  *                      iscsi_conn_send_pdu context with the session lock.
  57  *                      When not offloading the data path, this is called
  58  *                      from the scsi work queue without the session lock.
  59  * @xmit_task           Requests LLD to transfer cmd task. Returns 0 or the
  60  *                      number of bytes transferred on success, and -Exyz
  61  *                      value on error. When offloading the data path, this
  62  *                      is called from queuecommand with the session lock, or
  63  *                      from the iscsi_conn_send_pdu context with the session
  64  *                      lock. When not offloading the data path, this is called
  65  *                      from the scsi work queue without the session lock.
  66  * @cleanup_task:       requests LLD to fail task. Called with session lock
  67  *                      and after the connection has been suspended and
  68  *                      terminated during recovery. If called
  69  *                      from abort task then connection is not suspended
  70  *                      or terminated but sk_callback_lock is held
  71  *
  72  * Template API provided by iSCSI Transport
  73  */
  74 struct iscsi_transport {
  75         struct module *owner;
  76         char *name;
  77         unsigned int caps;
  78
  79         struct iscsi_cls_session *(*create_session) (struct iscsi_endpoint *ep,
  80                                         uint16_t cmds_max, uint16_t qdepth,
  81                                         uint32_t sn);
  82         void (*destroy_session) (struct iscsi_cls_session *session);
  83         struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess,
  84                                 uint32_t cid);
  85         int (*bind_conn) (struct iscsi_cls_session *session,
  86                           struct iscsi_cls_conn *cls_conn,
  87                           uint64_t transport_eph, int is_leading);
  88         int (*start_conn) (struct iscsi_cls_conn *conn);
  89         void (*stop_conn) (struct iscsi_cls_conn *conn, int flag);
  90         void (*destroy_conn) (struct iscsi_cls_conn *conn);
  91         int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param,
  92                           char *buf, int buflen);
  93         int (*get_ep_param) (struct iscsi_endpoint *ep, enum iscsi_param param,
  94                              char *buf);
  95         int (*get_conn_param) (struct iscsi_cls_conn *conn,
  96                                enum iscsi_param param, char *buf);
  97         int (*get_session_param) (struct iscsi_cls_session *session,
  98                                   enum iscsi_param param, char *buf);
  99         int (*get_host_param) (struct Scsi_Host *shost,
 100                                 enum iscsi_host_param param, char *buf);
 101         int (*set_host_param) (struct Scsi_Host *shost,
 102                                enum iscsi_host_param param, char *buf,
 103                                int buflen);
 104         int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
 105                          char *data, uint32_t data_size);
 106         void (*get_stats) (struct iscsi_cls_conn *conn,
 107                            struct iscsi_stats *stats);
 108
 109         int (*init_task) (struct iscsi_task *task);
 110         int (*xmit_task) (struct iscsi_task *task);
 111         void (*cleanup_task) (struct iscsi_task *task);
 112
 113         int (*alloc_pdu) (struct iscsi_task *task, uint8_t opcode);
 114         int (*xmit_pdu) (struct iscsi_task *task);
 115         int (*init_pdu) (struct iscsi_task *task, unsigned int offset,
 116                          unsigned int count);
 117         void (*parse_pdu_itt) (struct iscsi_conn *conn, itt_t itt,
 118                                int *index, int *age);
 119
 120         void (*session_recovery_timedout) (struct iscsi_cls_session *session);
 121         struct iscsi_endpoint *(*ep_connect) (struct Scsi_Host *shost,
 122                                               struct sockaddr *dst_addr,
 123                                               int non_blocking);
 124         int (*ep_poll) (struct iscsi_endpoint *ep, int timeout_ms);
 125         void (*ep_disconnect) (struct iscsi_endpoint *ep);
 126         int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type,
 127                           uint32_t enable, struct sockaddr *dst_addr);
 128         int (*set_path) (struct Scsi_Host *shost, struct iscsi_path *params);
 129         int (*set_iface_param) (struct Scsi_Host *shost, void *data,
 130                                 uint32_t len);
 131         int (*get_iface_param) (struct iscsi_iface *iface,
 132                                 enum iscsi_param_type param_type,
 133                                 int param, char *buf);
 134         umode_t (*attr_is_visible)(int param_type, int param);
 135         int (*bsg_request)(struct bsg_job *job);
 136         int (*send_ping) (struct Scsi_Host *shost, uint32_t iface_num,
 137                           uint32_t iface_type, uint32_t payload_size,
 138                           uint32_t pid, struct sockaddr *dst_addr);
 139         int (*get_chap) (struct Scsi_Host *shost, uint16_t chap_tbl_idx,
 140                          uint32_t *num_entries, char *buf);
 141         int (*delete_chap) (struct Scsi_Host *shost, uint16_t chap_tbl_idx);
 142         int (*set_chap) (struct Scsi_Host *shost, void *data, int len);
 143         int (*get_flashnode_param) (struct iscsi_bus_flash_session *fnode_sess,
 144                                     int param, char *buf);
 145         int (*set_flashnode_param) (struct iscsi_bus_flash_session *fnode_sess,
 146                                     struct iscsi_bus_flash_conn *fnode_conn,
 147                                     void *data, int len);
 148         int (*new_flashnode) (struct Scsi_Host *shost, const char *buf,
 149                               int len);
 150         int (*del_flashnode) (struct iscsi_bus_flash_session *fnode_sess);
 151         int (*login_flashnode) (struct iscsi_bus_flash_session *fnode_sess,
 152                                 struct iscsi_bus_flash_conn *fnode_conn);
 153         int (*logout_flashnode) (struct iscsi_bus_flash_session *fnode_sess,
 154                                  struct iscsi_bus_flash_conn *fnode_conn);
 155         int (*logout_flashnode_sid) (struct iscsi_cls_session *cls_sess);
 156         int (*get_host_stats) (struct Scsi_Host *shost, char *buf, int len);
 157         u8 (*check_protection)(struct iscsi_task *task, sector_t *sector);
 158 };
 159
 160 /*
 161  * transport registration upcalls
 162  */
 163 extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt);
 164 extern int iscsi_unregister_transport(struct iscsi_transport *tt);
 165
 166 /*
 167  * control plane upcalls
 168  */
 169 extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn,
 170                                    enum iscsi_err error);
 171 extern void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
 172                                    enum iscsi_conn_state state);
 173 extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
 174                           char *data, uint32_t data_size);
 175
 176 extern int iscsi_offload_mesg(struct Scsi_Host *shost,
 177                               struct iscsi_transport *transport, uint32_t type,
 178                               char *data, uint16_t data_size);
 179
 180 extern void iscsi_post_host_event(uint32_t host_no,
 181                                   struct iscsi_transport *transport,
 182                                   enum iscsi_host_event_code code,
 183                                   uint32_t data_size,
 184                                   uint8_t *data);
 185
 186 extern void iscsi_ping_comp_event(uint32_t host_no,
 187                                   struct iscsi_transport *transport,
 188                                   uint32_t status, uint32_t pid,
 189                                   uint32_t data_size, uint8_t *data);
 190
 191 /* iscsi class connection state */
 192 enum iscsi_connection_state {
 193         ISCSI_CONN_UP = 0,
 194         ISCSI_CONN_DOWN,
 195         ISCSI_CONN_FAILED,
 196 };
 197
 198 struct iscsi_cls_conn {
 199         struct list_head conn_list;     /* item in connlist */
 200         struct list_head conn_list_err; /* item in connlist_err */
 201         void *dd_data;                  /* LLD private data */
 202         struct iscsi_transport *transport;
 203         uint32_t cid;                   /* connection id */
 204         struct mutex ep_mutex;
 205         struct iscsi_endpoint *ep;
 206
 207         struct device dev;              /* sysfs transport/container device */
 208         enum iscsi_connection_state state;
 209 };
 210
 211 #define iscsi_dev_to_conn(_dev) \
 212         container_of(_dev, struct iscsi_cls_conn, dev)
 213
 214 #define transport_class_to_conn(_cdev) \
 215         iscsi_dev_to_conn(_cdev->parent)
 216
 217 #define iscsi_conn_to_session(_conn) \
 218         iscsi_dev_to_session(_conn->dev.parent)
 219
 220 /* iscsi class session state */
 221 enum {
 222         ISCSI_SESSION_LOGGED_IN,
 223         ISCSI_SESSION_FAILED,
 224         ISCSI_SESSION_FREE,
 225 };
 226
 227 #define ISCSI_MAX_TARGET -1
 228
 229 struct iscsi_cls_session {
 230         struct list_head sess_list;             /* item in session_list */
 231         struct iscsi_transport *transport;
 232         spinlock_t lock;
 233         struct work_struct block_work;
 234         struct work_struct unblock_work;
 235         struct work_struct scan_work;
 236         struct work_struct unbind_work;
 237         struct work_struct destroy_work;
 238
 239         /* recovery fields */
 240         int recovery_tmo;
 241         bool recovery_tmo_sysfs_override;
 242         struct delayed_work recovery_work;
 243
 244         unsigned int target_id;
 245         bool ida_used;
 246
 247         /*
 248          * pid of userspace process that created session or -1 if
 249          * created by the kernel.
 250          */
 251         pid_t creator;
 252         int state;
 253         int sid;                                /* session id */
 254         void *dd_data;                          /* LLD private data */
 255         struct device dev;      /* sysfs transport/container device */
 256 };
 257
 258 #define iscsi_dev_to_session(_dev) \
 259         container_of(_dev, struct iscsi_cls_session, dev)
 260
 261 #define transport_class_to_session(_cdev) \
 262         iscsi_dev_to_session(_cdev->parent)
 263
 264 #define iscsi_session_to_shost(_session) \
 265         dev_to_shost(_session->dev.parent)
 266
 267 #define starget_to_session(_stgt) \
 268         iscsi_dev_to_session(_stgt->dev.parent)
 269
 270 struct iscsi_cls_host {
 271         atomic_t nr_scans;
 272         struct mutex mutex;
 273         struct request_queue *bsg_q;
 274         uint32_t port_speed;
 275         uint32_t port_state;
 276 };
 277
 278 #define iscsi_job_to_shost(_job) \
 279         dev_to_shost(_job->dev)
 280
 281 extern void iscsi_host_for_each_session(struct Scsi_Host *shost,
 282                                 void (*fn)(struct iscsi_cls_session *));
 283
 284 struct iscsi_endpoint {
 285         void *dd_data;                  /* LLD private data */
 286         struct device dev;
 287         uint64_t id;
 288         struct iscsi_cls_conn *conn;
 289 };
 290
 291 struct iscsi_iface {
 292         struct device dev;
 293         struct iscsi_transport *transport;
 294         uint32_t iface_type;    /* IPv4 or IPv6 */
 295         uint32_t iface_num;     /* iface number, 0 - n */
 296         void *dd_data;          /* LLD private data */
 297 };
 298
 299 #define iscsi_dev_to_iface(_dev) \
 300         container_of(_dev, struct iscsi_iface, dev)
 301
 302 #define iscsi_iface_to_shost(_iface) \
 303         dev_to_shost(_iface->dev.parent)
 304
 305
 306 struct iscsi_bus_flash_conn {
 307         struct list_head conn_list;     /* item in connlist */
 308         void *dd_data;                  /* LLD private data */
 309         struct iscsi_transport *transport;
 310         struct device dev;              /* sysfs transport/container device */
 311         /* iscsi connection parameters */
 312         uint32_t                exp_statsn;
 313         uint32_t                statsn;
 314         unsigned                max_recv_dlength; /* initiator_max_recv_dsl*/
 315         unsigned                max_xmit_dlength; /* target_max_recv_dsl */
 316         unsigned                max_segment_size;
 317         unsigned                tcp_xmit_wsf;
 318         unsigned                tcp_recv_wsf;
 319         int                     hdrdgst_en;
 320         int                     datadgst_en;
 321         int                     port;
 322         char                    *ipaddress;
 323         char                    *link_local_ipv6_addr;
 324         char                    *redirect_ipaddr;
 325         uint16_t                keepalive_timeout;
 326         uint16_t                local_port;
 327         uint8_t                 snack_req_en;
 328         /* tcp timestamp negotiation status */
 329         uint8_t                 tcp_timestamp_stat;
 330         uint8_t                 tcp_nagle_disable;
 331         /* tcp window scale factor */
 332         uint8_t                 tcp_wsf_disable;
 333         uint8_t                 tcp_timer_scale;
 334         uint8_t                 tcp_timestamp_en;
 335         uint8_t                 ipv4_tos;
 336         uint8_t                 ipv6_traffic_class;
 337         uint8_t                 ipv6_flow_label;
 338         uint8_t                 fragment_disable;
 339         /* Link local IPv6 address is assigned by firmware or driver */
 340         uint8_t                 is_fw_assigned_ipv6;
 341 };
 342
 343 #define iscsi_dev_to_flash_conn(_dev) \
 344         container_of(_dev, struct iscsi_bus_flash_conn, dev)
 345
 346 #define iscsi_flash_conn_to_flash_session(_conn) \
 347         iscsi_dev_to_flash_session(_conn->dev.parent)
 348
 349 #define ISID_SIZE 6
 350
 351 struct iscsi_bus_flash_session {
 352         struct list_head sess_list;             /* item in session_list */
 353         struct iscsi_transport *transport;
 354         unsigned int target_id;
 355         int flash_state;        /* persistent or non-persistent */
 356         void *dd_data;                          /* LLD private data */
 357         struct device dev;      /* sysfs transport/container device */
 358         /* iscsi session parameters */
 359         unsigned                first_burst;
 360         unsigned                max_burst;
 361         unsigned short          max_r2t;
 362         int                     default_taskmgmt_timeout;
 363         int                     initial_r2t_en;
 364         int                     imm_data_en;
 365         int                     time2wait;
 366         int                     time2retain;
 367         int                     pdu_inorder_en;
 368         int                     dataseq_inorder_en;
 369         int                     erl;
 370         int                     tpgt;
 371         char                    *username;
 372         char                    *username_in;
 373         char                    *password;
 374         char                    *password_in;
 375         char                    *targetname;
 376         char                    *targetalias;
 377         char                    *portal_type;
 378         uint16_t                tsid;
 379         uint16_t                chap_in_idx;
 380         uint16_t                chap_out_idx;
 381         /* index of iSCSI discovery session if the entry is
 382          * discovered by iSCSI discovery session
 383          */
 384         uint16_t                discovery_parent_idx;
 385         /* indicates if discovery was done through iSNS discovery service
 386          * or through sendTarget */
 387         uint16_t                discovery_parent_type;
 388         /* Firmware auto sendtarget discovery disable */
 389         uint8_t                 auto_snd_tgt_disable;
 390         uint8_t                 discovery_sess;
 391         /* indicates if this flashnode entry is enabled or disabled */
 392         uint8_t                 entry_state;
 393         uint8_t                 chap_auth_en;
 394         /* enables firmware to auto logout the discovery session on discovery
 395          * completion
 396          */
 397         uint8_t                 discovery_logout_en;
 398         uint8_t                 bidi_chap_en;
 399         /* makes authentication for discovery session optional */
 400         uint8_t                 discovery_auth_optional;
 401         uint8_t                 isid[ISID_SIZE];
 402         uint8_t                 is_boot_target;
 403 };
 404
 405 #define iscsi_dev_to_flash_session(_dev) \
 406         container_of(_dev, struct iscsi_bus_flash_session, dev)
 407
 408 #define iscsi_flash_session_to_shost(_session) \
 409         dev_to_shost(_session->dev.parent)
 410
 411 /*
 412  * session and connection functions that can be used by HW iSCSI LLDs
 413  */
 414 #define iscsi_cls_session_printk(prefix, _cls_session, fmt, a...) \
 415         dev_printk(prefix, &(_cls_session)->dev, fmt, ##a)
 416
 417 #define iscsi_cls_conn_printk(prefix, _cls_conn, fmt, a...) \
 418         dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a)
 419
 420 extern int iscsi_session_chkready(struct iscsi_cls_session *session);
 421 extern int iscsi_is_session_online(struct iscsi_cls_session *session);
 422 extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost,
 423                                 struct iscsi_transport *transport, int dd_size);
 424 extern int iscsi_add_session(struct iscsi_cls_session *session,
 425                              unsigned int target_id);
 426 extern int iscsi_session_event(struct iscsi_cls_session *session,
 427                                enum iscsi_uevent_e event);
 428 extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost,
 429                                                 struct iscsi_transport *t,
 430                                                 int dd_size,
 431                                                 unsigned int target_id);
 432 extern void iscsi_remove_session(struct iscsi_cls_session *session);
 433 extern void iscsi_free_session(struct iscsi_cls_session *session);
 434 extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess,
 435                                                 int dd_size, uint32_t cid);
 436 extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
 437 extern void iscsi_unblock_session(struct iscsi_cls_session *session);
 438 extern void iscsi_block_session(struct iscsi_cls_session *session);
 439 extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time);
 440 extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size);
 441 extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep);
 442 extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle);
 443 extern int iscsi_block_scsi_eh(struct scsi_cmnd *cmd);
 444 extern struct iscsi_iface *iscsi_create_iface(struct Scsi_Host *shost,
 445                                               struct iscsi_transport *t,
 446                                               uint32_t iface_type,
 447                                               uint32_t iface_num, int dd_size);
 448 extern void iscsi_destroy_iface(struct iscsi_iface *iface);
 449 extern struct iscsi_iface *iscsi_lookup_iface(int handle);
 450 extern char *iscsi_get_port_speed_name(struct Scsi_Host *shost);
 451 extern char *iscsi_get_port_state_name(struct Scsi_Host *shost);
 452 extern int iscsi_is_session_dev(const struct device *dev);
 453
 454 extern char *iscsi_get_discovery_parent_name(int parent_type);
 455 extern struct device *
 456 iscsi_find_flashnode(struct Scsi_Host *shost, void *data,
 457                      int (*fn)(struct device *dev, void *data));
 458
 459 extern struct iscsi_bus_flash_session *
 460 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
 461                             struct iscsi_transport *transport, int dd_size);
 462
 463 extern struct iscsi_bus_flash_conn *
 464 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
 465                             struct iscsi_bus_flash_session *fnode_sess,
 466                             struct iscsi_transport *transport, int dd_size);
 467
 468 extern void
 469 iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess);
 470
 471 extern void iscsi_destroy_all_flashnode(struct Scsi_Host *shost);
 472 extern int iscsi_flashnode_bus_match(struct device *dev,
 473                                      struct device_driver *drv);
 474 extern struct device *
 475 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
 476                           int (*fn)(struct device *dev, void *data));
 477 extern struct device *
 478 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess);
 479
 480 extern char *
 481 iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state);
 482 extern char *iscsi_get_router_state_name(enum iscsi_router_state router_state);
 483 #endif