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         void (*unbind_conn) (struct iscsi_cls_conn *conn, bool is_active);
  86         int (*bind_conn) (struct iscsi_cls_session *session,
  87                           struct iscsi_cls_conn *cls_conn,
  88                           uint64_t transport_eph, int is_leading);
  89         int (*start_conn) (struct iscsi_cls_conn *conn);
  90         void (*stop_conn) (struct iscsi_cls_conn *conn, int flag);
  91         void (*destroy_conn) (struct iscsi_cls_conn *conn);
  92         int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param,
  93                           char *buf, int buflen);
  94         int (*get_ep_param) (struct iscsi_endpoint *ep, enum iscsi_param param,
  95                              char *buf);
  96         int (*get_conn_param) (struct iscsi_cls_conn *conn,
  97                                enum iscsi_param param, char *buf);
  98         int (*get_session_param) (struct iscsi_cls_session *session,
  99                                   enum iscsi_param param, char *buf);
 100         int (*get_host_param) (struct Scsi_Host *shost,
 101                                 enum iscsi_host_param param, char *buf);
 102         int (*set_host_param) (struct Scsi_Host *shost,
 103                                enum iscsi_host_param param, char *buf,
 104                                int buflen);
 105         int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
 106                          char *data, uint32_t data_size);
 107         void (*get_stats) (struct iscsi_cls_conn *conn,
 108                            struct iscsi_stats *stats);
 109
 110         int (*init_task) (struct iscsi_task *task);
 111         int (*xmit_task) (struct iscsi_task *task);
 112         void (*cleanup_task) (struct iscsi_task *task);
 113
 114         int (*alloc_pdu) (struct iscsi_task *task, uint8_t opcode);
 115         int (*xmit_pdu) (struct iscsi_task *task);
 116         int (*init_pdu) (struct iscsi_task *task, unsigned int offset,
 117                          unsigned int count);
 118         void (*parse_pdu_itt) (struct iscsi_conn *conn, itt_t itt,
 119                                int *index, int *age);
 120
 121         void (*session_recovery_timedout) (struct iscsi_cls_session *session);
 122         struct iscsi_endpoint *(*ep_connect) (struct Scsi_Host *shost,
 123                                               struct sockaddr *dst_addr,
 124                                               int non_blocking);
 125         int (*ep_poll) (struct iscsi_endpoint *ep, int timeout_ms);
 126         void (*ep_disconnect) (struct iscsi_endpoint *ep);
 127         int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type,
 128                           uint32_t enable, struct sockaddr *dst_addr);
 129         int (*set_path) (struct Scsi_Host *shost, struct iscsi_path *params);
 130         int (*set_iface_param) (struct Scsi_Host *shost, void *data,
 131                                 uint32_t len);
 132         int (*get_iface_param) (struct iscsi_iface *iface,
 133                                 enum iscsi_param_type param_type,
 134                                 int param, char *buf);
 135         umode_t (*attr_is_visible)(int param_type, int param);
 136         int (*bsg_request)(struct bsg_job *job);
 137         int (*send_ping) (struct Scsi_Host *shost, uint32_t iface_num,
 138                           uint32_t iface_type, uint32_t payload_size,
 139                           uint32_t pid, struct sockaddr *dst_addr);
 140         int (*get_chap) (struct Scsi_Host *shost, uint16_t chap_tbl_idx,
 141                          uint32_t *num_entries, char *buf);
 142         int (*delete_chap) (struct Scsi_Host *shost, uint16_t chap_tbl_idx);
 143         int (*set_chap) (struct Scsi_Host *shost, void *data, int len);
 144         int (*get_flashnode_param) (struct iscsi_bus_flash_session *fnode_sess,
 145                                     int param, char *buf);
 146         int (*set_flashnode_param) (struct iscsi_bus_flash_session *fnode_sess,
 147                                     struct iscsi_bus_flash_conn *fnode_conn,
 148                                     void *data, int len);
 149         int (*new_flashnode) (struct Scsi_Host *shost, const char *buf,
 150                               int len);
 151         int (*del_flashnode) (struct iscsi_bus_flash_session *fnode_sess);
 152         int (*login_flashnode) (struct iscsi_bus_flash_session *fnode_sess,
 153                                 struct iscsi_bus_flash_conn *fnode_conn);
 154         int (*logout_flashnode) (struct iscsi_bus_flash_session *fnode_sess,
 155                                  struct iscsi_bus_flash_conn *fnode_conn);
 156         int (*logout_flashnode_sid) (struct iscsi_cls_session *cls_sess);
 157         int (*get_host_stats) (struct Scsi_Host *shost, char *buf, int len);
 158         u8 (*check_protection)(struct iscsi_task *task, sector_t *sector);
 159 };
 160
 161 /*
 162  * transport registration upcalls
 163  */
 164 extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt);
 165 extern int iscsi_unregister_transport(struct iscsi_transport *tt);
 166
 167 /*
 168  * control plane upcalls
 169  */
 170 extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn,
 171                                    enum iscsi_err error);
 172 extern void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
 173                                    enum iscsi_conn_state state);
 174 extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
 175                           char *data, uint32_t data_size);
 176
 177 extern int iscsi_offload_mesg(struct Scsi_Host *shost,
 178                               struct iscsi_transport *transport, uint32_t type,
 179                               char *data, uint16_t data_size);
 180
 181 extern void iscsi_post_host_event(uint32_t host_no,
 182                                   struct iscsi_transport *transport,
 183                                   enum iscsi_host_event_code code,
 184                                   uint32_t data_size,
 185                                   uint8_t *data);
 186
 187 extern void iscsi_ping_comp_event(uint32_t host_no,
 188                                   struct iscsi_transport *transport,
 189                                   uint32_t status, uint32_t pid,
 190                                   uint32_t data_size, uint8_t *data);
 191
 192 /* iscsi class connection state */
 193 enum iscsi_connection_state {
 194         ISCSI_CONN_UP = 0,
 195         ISCSI_CONN_DOWN,
 196         ISCSI_CONN_FAILED,
 197         ISCSI_CONN_BOUND,
 198 };
 199
 200 #define ISCSI_CLS_CONN_BIT_CLEANUP      1
 201
 202 struct iscsi_cls_conn {
 203         struct list_head conn_list;     /* item in connlist */
 204         void *dd_data;                  /* LLD private data */
 205         struct iscsi_transport *transport;
 206         uint32_t cid;                   /* connection id */
 207         /*
 208          * This protects the conn startup and binding/unbinding of the ep to
 209          * the conn. Unbinding includes ep_disconnect and stop_conn.
 210          */
 211         struct mutex ep_mutex;
 212         struct iscsi_endpoint *ep;
 213
 214         /* Used when accessing flags and queueing work. */
 215         spinlock_t lock;
 216         unsigned long flags;
 217         struct work_struct cleanup_work;
 218
 219         struct device dev;              /* sysfs transport/container device */
 220         enum iscsi_connection_state state;
 221 };
 222
 223 #define iscsi_dev_to_conn(_dev) \
 224         container_of(_dev, struct iscsi_cls_conn, dev)
 225
 226 #define transport_class_to_conn(_cdev) \
 227         iscsi_dev_to_conn(_cdev->parent)
 228
 229 #define iscsi_conn_to_session(_conn) \
 230         iscsi_dev_to_session(_conn->dev.parent)
 231
 232 /* iscsi class session state */
 233 enum {
 234         ISCSI_SESSION_LOGGED_IN,
 235         ISCSI_SESSION_FAILED,
 236         ISCSI_SESSION_FREE,
 237 };
 238
 239 #define ISCSI_MAX_TARGET -1
 240
 241 struct iscsi_cls_session {
 242         struct list_head sess_list;             /* item in session_list */
 243         struct iscsi_transport *transport;
 244         spinlock_t lock;
 245         struct work_struct block_work;
 246         struct work_struct unblock_work;
 247         struct work_struct scan_work;
 248         struct work_struct unbind_work;
 249         struct work_struct destroy_work;
 250
 251         /* recovery fields */
 252         int recovery_tmo;
 253         bool recovery_tmo_sysfs_override;
 254         struct delayed_work recovery_work;
 255
 256         unsigned int target_id;
 257         bool ida_used;
 258
 259         /*
 260          * pid of userspace process that created session or -1 if
 261          * created by the kernel.
 262          */
 263         pid_t creator;
 264         int state;
 265         int sid;                                /* session id */
 266         void *dd_data;                          /* LLD private data */
 267         struct device dev;      /* sysfs transport/container device */
 268 };
 269
 270 #define iscsi_dev_to_session(_dev) \
 271         container_of(_dev, struct iscsi_cls_session, dev)
 272
 273 #define transport_class_to_session(_cdev) \
 274         iscsi_dev_to_session(_cdev->parent)
 275
 276 #define iscsi_session_to_shost(_session) \
 277         dev_to_shost(_session->dev.parent)
 278
 279 #define starget_to_session(_stgt) \
 280         iscsi_dev_to_session(_stgt->dev.parent)
 281
 282 struct iscsi_cls_host {
 283         atomic_t nr_scans;
 284         struct mutex mutex;
 285         struct request_queue *bsg_q;
 286         uint32_t port_speed;
 287         uint32_t port_state;
 288 };
 289
 290 #define iscsi_job_to_shost(_job) \
 291         dev_to_shost(_job->dev)
 292
 293 extern void iscsi_host_for_each_session(struct Scsi_Host *shost,
 294                                 void (*fn)(struct iscsi_cls_session *));
 295
 296 struct iscsi_endpoint {
 297         void *dd_data;                  /* LLD private data */
 298         struct device dev;
 299         uint64_t id;
 300         struct iscsi_cls_conn *conn;
 301 };
 302
 303 struct iscsi_iface {
 304         struct device dev;
 305         struct iscsi_transport *transport;
 306         uint32_t iface_type;    /* IPv4 or IPv6 */
 307         uint32_t iface_num;     /* iface number, 0 - n */
 308         void *dd_data;          /* LLD private data */
 309 };
 310
 311 #define iscsi_dev_to_iface(_dev) \
 312         container_of(_dev, struct iscsi_iface, dev)
 313
 314 #define iscsi_iface_to_shost(_iface) \
 315         dev_to_shost(_iface->dev.parent)
 316
 317
 318 struct iscsi_bus_flash_conn {
 319         struct list_head conn_list;     /* item in connlist */
 320         void *dd_data;                  /* LLD private data */
 321         struct iscsi_transport *transport;
 322         struct device dev;              /* sysfs transport/container device */
 323         /* iscsi connection parameters */
 324         uint32_t                exp_statsn;
 325         uint32_t                statsn;
 326         unsigned                max_recv_dlength; /* initiator_max_recv_dsl*/
 327         unsigned                max_xmit_dlength; /* target_max_recv_dsl */
 328         unsigned                max_segment_size;
 329         unsigned                tcp_xmit_wsf;
 330         unsigned                tcp_recv_wsf;
 331         int                     hdrdgst_en;
 332         int                     datadgst_en;
 333         int                     port;
 334         char                    *ipaddress;
 335         char                    *link_local_ipv6_addr;
 336         char                    *redirect_ipaddr;
 337         uint16_t                keepalive_timeout;
 338         uint16_t                local_port;
 339         uint8_t                 snack_req_en;
 340         /* tcp timestamp negotiation status */
 341         uint8_t                 tcp_timestamp_stat;
 342         uint8_t                 tcp_nagle_disable;
 343         /* tcp window scale factor */
 344         uint8_t                 tcp_wsf_disable;
 345         uint8_t                 tcp_timer_scale;
 346         uint8_t                 tcp_timestamp_en;
 347         uint8_t                 ipv4_tos;
 348         uint8_t                 ipv6_traffic_class;
 349         uint8_t                 ipv6_flow_label;
 350         uint8_t                 fragment_disable;
 351         /* Link local IPv6 address is assigned by firmware or driver */
 352         uint8_t                 is_fw_assigned_ipv6;
 353 };
 354
 355 #define iscsi_dev_to_flash_conn(_dev) \
 356         container_of(_dev, struct iscsi_bus_flash_conn, dev)
 357
 358 #define iscsi_flash_conn_to_flash_session(_conn) \
 359         iscsi_dev_to_flash_session(_conn->dev.parent)
 360
 361 #define ISID_SIZE 6
 362
 363 struct iscsi_bus_flash_session {
 364         struct list_head sess_list;             /* item in session_list */
 365         struct iscsi_transport *transport;
 366         unsigned int target_id;
 367         int flash_state;        /* persistent or non-persistent */
 368         void *dd_data;                          /* LLD private data */
 369         struct device dev;      /* sysfs transport/container device */
 370         /* iscsi session parameters */
 371         unsigned                first_burst;
 372         unsigned                max_burst;
 373         unsigned short          max_r2t;
 374         int                     default_taskmgmt_timeout;
 375         int                     initial_r2t_en;
 376         int                     imm_data_en;
 377         int                     time2wait;
 378         int                     time2retain;
 379         int                     pdu_inorder_en;
 380         int                     dataseq_inorder_en;
 381         int                     erl;
 382         int                     tpgt;
 383         char                    *username;
 384         char                    *username_in;
 385         char                    *password;
 386         char                    *password_in;
 387         char                    *targetname;
 388         char                    *targetalias;
 389         char                    *portal_type;
 390         uint16_t                tsid;
 391         uint16_t                chap_in_idx;
 392         uint16_t                chap_out_idx;
 393         /* index of iSCSI discovery session if the entry is
 394          * discovered by iSCSI discovery session
 395          */
 396         uint16_t                discovery_parent_idx;
 397         /* indicates if discovery was done through iSNS discovery service
 398          * or through sendTarget */
 399         uint16_t                discovery_parent_type;
 400         /* Firmware auto sendtarget discovery disable */
 401         uint8_t                 auto_snd_tgt_disable;
 402         uint8_t                 discovery_sess;
 403         /* indicates if this flashnode entry is enabled or disabled */
 404         uint8_t                 entry_state;
 405         uint8_t                 chap_auth_en;
 406         /* enables firmware to auto logout the discovery session on discovery
 407          * completion
 408          */
 409         uint8_t                 discovery_logout_en;
 410         uint8_t                 bidi_chap_en;
 411         /* makes authentication for discovery session optional */
 412         uint8_t                 discovery_auth_optional;
 413         uint8_t                 isid[ISID_SIZE];
 414         uint8_t                 is_boot_target;
 415 };
 416
 417 #define iscsi_dev_to_flash_session(_dev) \
 418         container_of(_dev, struct iscsi_bus_flash_session, dev)
 419
 420 #define iscsi_flash_session_to_shost(_session) \
 421         dev_to_shost(_session->dev.parent)
 422
 423 /*
 424  * session and connection functions that can be used by HW iSCSI LLDs
 425  */
 426 #define iscsi_cls_session_printk(prefix, _cls_session, fmt, a...) \
 427         dev_printk(prefix, &(_cls_session)->dev, fmt, ##a)
 428
 429 #define iscsi_cls_conn_printk(prefix, _cls_conn, fmt, a...) \
 430         dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a)
 431
 432 extern int iscsi_session_chkready(struct iscsi_cls_session *session);
 433 extern int iscsi_is_session_online(struct iscsi_cls_session *session);
 434 extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost,
 435                                 struct iscsi_transport *transport, int dd_size);
 436 extern int iscsi_add_session(struct iscsi_cls_session *session,
 437                              unsigned int target_id);
 438 extern int iscsi_session_event(struct iscsi_cls_session *session,
 439                                enum iscsi_uevent_e event);
 440 extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost,
 441                                                 struct iscsi_transport *t,
 442                                                 int dd_size,
 443                                                 unsigned int target_id);
 444 extern void iscsi_remove_session(struct iscsi_cls_session *session);
 445 extern void iscsi_free_session(struct iscsi_cls_session *session);
 446 extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess,
 447                                                 int dd_size, uint32_t cid);
 448 extern void iscsi_put_conn(struct iscsi_cls_conn *conn);
 449 extern void iscsi_get_conn(struct iscsi_cls_conn *conn);
 450 extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
 451 extern void iscsi_unblock_session(struct iscsi_cls_session *session);
 452 extern void iscsi_block_session(struct iscsi_cls_session *session);
 453 extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time);
 454 extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size);
 455 extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep);
 456 extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle);
 457 extern void iscsi_put_endpoint(struct iscsi_endpoint *ep);
 458 extern int iscsi_block_scsi_eh(struct scsi_cmnd *cmd);
 459 extern struct iscsi_iface *iscsi_create_iface(struct Scsi_Host *shost,
 460                                               struct iscsi_transport *t,
 461                                               uint32_t iface_type,
 462                                               uint32_t iface_num, int dd_size);
 463 extern void iscsi_destroy_iface(struct iscsi_iface *iface);
 464 extern struct iscsi_iface *iscsi_lookup_iface(int handle);
 465 extern char *iscsi_get_port_speed_name(struct Scsi_Host *shost);
 466 extern char *iscsi_get_port_state_name(struct Scsi_Host *shost);
 467 extern int iscsi_is_session_dev(const struct device *dev);
 468
 469 extern char *iscsi_get_discovery_parent_name(int parent_type);
 470 extern struct device *
 471 iscsi_find_flashnode(struct Scsi_Host *shost, void *data,
 472                      int (*fn)(struct device *dev, void *data));
 473
 474 extern struct iscsi_bus_flash_session *
 475 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
 476                             struct iscsi_transport *transport, int dd_size);
 477
 478 extern struct iscsi_bus_flash_conn *
 479 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
 480                             struct iscsi_bus_flash_session *fnode_sess,
 481                             struct iscsi_transport *transport, int dd_size);
 482
 483 extern void
 484 iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess);
 485
 486 extern void iscsi_destroy_all_flashnode(struct Scsi_Host *shost);
 487 extern int iscsi_flashnode_bus_match(struct device *dev,
 488                                      struct device_driver *drv);
 489 extern struct device *
 490 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
 491                           int (*fn)(struct device *dev, void *data));
 492 extern struct device *
 493 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess);
 494
 495 extern char *
 496 iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state);
 497 extern char *iscsi_get_router_state_name(enum iscsi_router_state router_state);
 498 #endif