252 lines
10 KiB
C
252 lines
10 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef TARGET_CORE_FABRIC_H
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#define TARGET_CORE_FABRIC_H
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#include <linux/configfs.h>
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#include <linux/types.h>
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#include <target/target_core_base.h>
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struct target_core_fabric_ops {
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struct module *module;
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/*
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* XXX: Special case for iscsi/iSCSI...
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* If non-null, fabric_alias is used for matching target/$fabric
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* ConfigFS paths. If null, fabric_name is used for this (see below).
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*/
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const char *fabric_alias;
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/*
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* fabric_name is used for matching target/$fabric ConfigFS paths
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* without a fabric_alias (see above). It's also used for the ALUA state
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* path and is stored on disk with PR state.
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*/
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const char *fabric_name;
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size_t node_acl_size;
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/*
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* Limits number of scatterlist entries per SCF_SCSI_DATA_CDB payload.
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* Setting this value tells target-core to enforce this limit, and
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* report as INQUIRY EVPD=b0 MAXIMUM TRANSFER LENGTH.
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*
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* target-core will currently reset se_cmd->data_length to this
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* maximum size, and set UNDERFLOW residual count if length exceeds
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* this limit.
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*
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* XXX: Not all initiator hosts honor this block-limit EVPD
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* XXX: Currently assumes single PAGE_SIZE per scatterlist entry
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*/
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u32 max_data_sg_nents;
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char *(*tpg_get_wwn)(struct se_portal_group *);
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u16 (*tpg_get_tag)(struct se_portal_group *);
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u32 (*tpg_get_default_depth)(struct se_portal_group *);
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int (*tpg_check_demo_mode)(struct se_portal_group *);
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int (*tpg_check_demo_mode_cache)(struct se_portal_group *);
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int (*tpg_check_demo_mode_write_protect)(struct se_portal_group *);
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int (*tpg_check_prod_mode_write_protect)(struct se_portal_group *);
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/*
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* Optionally used by fabrics to allow demo-mode login, but not
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* expose any TPG LUNs, and return 'not connected' in standard
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* inquiry response
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*/
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int (*tpg_check_demo_mode_login_only)(struct se_portal_group *);
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/*
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* Optionally used as a configfs tunable to determine when
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* target-core should signal the PROTECT=1 feature bit for
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* backends that don't support T10-PI, so that either fabric
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* HW offload or target-core emulation performs the associated
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* WRITE_STRIP and READ_INSERT operations.
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*/
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int (*tpg_check_prot_fabric_only)(struct se_portal_group *);
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u32 (*tpg_get_inst_index)(struct se_portal_group *);
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/*
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* Optional to release struct se_cmd and fabric dependent allocated
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* I/O descriptor after command execution has finished.
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*
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* Returning 1 will signal a descriptor has been released.
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* Returning 0 will signal a descriptor has not been released.
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*/
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int (*check_stop_free)(struct se_cmd *);
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void (*release_cmd)(struct se_cmd *);
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void (*close_session)(struct se_session *);
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u32 (*sess_get_index)(struct se_session *);
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/*
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* Used only for SCSI fabrics that contain multi-value TransportIDs
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* (like iSCSI). All other SCSI fabrics should set this to NULL.
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*/
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u32 (*sess_get_initiator_sid)(struct se_session *,
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unsigned char *, u32);
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int (*write_pending)(struct se_cmd *);
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void (*set_default_node_attributes)(struct se_node_acl *);
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int (*get_cmd_state)(struct se_cmd *);
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int (*queue_data_in)(struct se_cmd *);
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int (*queue_status)(struct se_cmd *);
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void (*queue_tm_rsp)(struct se_cmd *);
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void (*aborted_task)(struct se_cmd *);
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/*
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* fabric module calls for target_core_fabric_configfs.c
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*/
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struct se_wwn *(*fabric_make_wwn)(struct target_fabric_configfs *,
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struct config_group *, const char *);
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void (*fabric_drop_wwn)(struct se_wwn *);
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void (*add_wwn_groups)(struct se_wwn *);
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struct se_portal_group *(*fabric_make_tpg)(struct se_wwn *,
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const char *);
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int (*fabric_enable_tpg)(struct se_portal_group *se_tpg, bool enable);
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void (*fabric_drop_tpg)(struct se_portal_group *);
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int (*fabric_post_link)(struct se_portal_group *,
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struct se_lun *);
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void (*fabric_pre_unlink)(struct se_portal_group *,
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struct se_lun *);
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struct se_tpg_np *(*fabric_make_np)(struct se_portal_group *,
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struct config_group *, const char *);
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void (*fabric_drop_np)(struct se_tpg_np *);
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int (*fabric_init_nodeacl)(struct se_node_acl *, const char *);
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struct configfs_attribute **tfc_discovery_attrs;
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struct configfs_attribute **tfc_wwn_attrs;
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struct configfs_attribute **tfc_tpg_base_attrs;
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struct configfs_attribute **tfc_tpg_np_base_attrs;
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struct configfs_attribute **tfc_tpg_attrib_attrs;
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struct configfs_attribute **tfc_tpg_auth_attrs;
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struct configfs_attribute **tfc_tpg_param_attrs;
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struct configfs_attribute **tfc_tpg_nacl_base_attrs;
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struct configfs_attribute **tfc_tpg_nacl_attrib_attrs;
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struct configfs_attribute **tfc_tpg_nacl_auth_attrs;
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struct configfs_attribute **tfc_tpg_nacl_param_attrs;
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/*
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* Set this member variable to true if the SCSI transport protocol
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* (e.g. iSCSI) requires that the Data-Out buffer is transferred in
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* its entirety before a command is aborted.
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*/
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bool write_pending_must_be_called;
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};
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int target_register_template(const struct target_core_fabric_ops *fo);
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void target_unregister_template(const struct target_core_fabric_ops *fo);
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int target_depend_item(struct config_item *item);
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void target_undepend_item(struct config_item *item);
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struct se_session *target_setup_session(struct se_portal_group *,
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unsigned int, unsigned int, enum target_prot_op prot_op,
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const char *, void *,
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int (*callback)(struct se_portal_group *,
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struct se_session *, void *));
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void target_remove_session(struct se_session *);
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void target_stop_cmd_counter(struct target_cmd_counter *cmd_cnt);
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void target_wait_for_cmds(struct target_cmd_counter *cmd_cnt);
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struct target_cmd_counter *target_alloc_cmd_counter(void);
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void target_free_cmd_counter(struct target_cmd_counter *cmd_cnt);
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void transport_init_session(struct se_session *se_sess);
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struct se_session *transport_alloc_session(enum target_prot_op);
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int transport_alloc_session_tags(struct se_session *, unsigned int,
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unsigned int);
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void __transport_register_session(struct se_portal_group *,
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struct se_node_acl *, struct se_session *, void *);
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void transport_register_session(struct se_portal_group *,
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struct se_node_acl *, struct se_session *, void *);
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ssize_t target_show_dynamic_sessions(struct se_portal_group *, char *);
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void transport_free_session(struct se_session *);
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void target_spc2_release(struct se_node_acl *nacl);
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void target_put_nacl(struct se_node_acl *);
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void transport_deregister_session_configfs(struct se_session *);
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void transport_deregister_session(struct se_session *);
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void __target_init_cmd(struct se_cmd *cmd,
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const struct target_core_fabric_ops *tfo,
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struct se_session *sess, u32 data_length, int data_direction,
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int task_attr, unsigned char *sense_buffer, u64 unpacked_lun,
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struct target_cmd_counter *cmd_cnt);
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int target_init_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
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unsigned char *sense, u64 unpacked_lun, u32 data_length,
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int task_attr, int data_dir, int flags);
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int target_submit_prep(struct se_cmd *se_cmd, unsigned char *cdb,
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struct scatterlist *sgl, u32 sgl_count,
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struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
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struct scatterlist *sgl_prot, u32 sgl_prot_count, gfp_t gfp);
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void target_submit(struct se_cmd *se_cmd);
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sense_reason_t transport_lookup_cmd_lun(struct se_cmd *);
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sense_reason_t target_cmd_init_cdb(struct se_cmd *se_cmd, unsigned char *cdb,
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gfp_t gfp);
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sense_reason_t target_cmd_parse_cdb(struct se_cmd *);
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void target_submit_cmd(struct se_cmd *, struct se_session *, unsigned char *,
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unsigned char *, u64, u32, int, int, int);
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void target_queue_submission(struct se_cmd *se_cmd);
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int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
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unsigned char *sense, u64 unpacked_lun,
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void *fabric_tmr_ptr, unsigned char tm_type,
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gfp_t, u64, int);
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int transport_handle_cdb_direct(struct se_cmd *);
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sense_reason_t transport_generic_new_cmd(struct se_cmd *);
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void target_put_cmd_and_wait(struct se_cmd *cmd);
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void target_execute_cmd(struct se_cmd *cmd);
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int transport_generic_free_cmd(struct se_cmd *, int);
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bool transport_wait_for_tasks(struct se_cmd *);
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int transport_send_check_condition_and_sense(struct se_cmd *,
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sense_reason_t, int);
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int target_send_busy(struct se_cmd *cmd);
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int target_get_sess_cmd(struct se_cmd *, bool);
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int target_put_sess_cmd(struct se_cmd *);
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void target_stop_session(struct se_session *se_sess);
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void target_wait_for_sess_cmds(struct se_session *);
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void target_show_cmd(const char *pfx, struct se_cmd *cmd);
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int core_alua_check_nonop_delay(struct se_cmd *);
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int core_tmr_alloc_req(struct se_cmd *, void *, u8, gfp_t);
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void core_tmr_release_req(struct se_tmr_req *);
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int transport_generic_handle_tmr(struct se_cmd *);
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void transport_generic_request_failure(struct se_cmd *, sense_reason_t);
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int transport_lookup_tmr_lun(struct se_cmd *);
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void core_allocate_nexus_loss_ua(struct se_node_acl *acl);
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struct se_node_acl *core_tpg_get_initiator_node_acl(struct se_portal_group *tpg,
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unsigned char *);
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bool target_tpg_has_node_acl(struct se_portal_group *tpg,
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const char *);
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struct se_node_acl *core_tpg_check_initiator_node_acl(struct se_portal_group *,
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unsigned char *);
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int core_tpg_set_initiator_node_queue_depth(struct se_node_acl *, u32);
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int core_tpg_set_initiator_node_tag(struct se_portal_group *,
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struct se_node_acl *, const char *);
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int core_tpg_register(struct se_wwn *, struct se_portal_group *, int);
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int core_tpg_deregister(struct se_portal_group *);
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int target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents,
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u32 length, bool zero_page, bool chainable);
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void target_free_sgl(struct scatterlist *sgl, int nents);
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/*
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* The LIO target core uses DMA_TO_DEVICE to mean that data is going
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* to the target (eg handling a WRITE) and DMA_FROM_DEVICE to mean
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* that data is coming from the target (eg handling a READ). However,
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* this is just the opposite of what we have to tell the DMA mapping
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* layer -- eg when handling a READ, the HBA will have to DMA the data
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* out of memory so it can send it to the initiator, which means we
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* need to use DMA_TO_DEVICE when we map the data.
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*/
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static inline enum dma_data_direction
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target_reverse_dma_direction(struct se_cmd *se_cmd)
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{
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if (se_cmd->se_cmd_flags & SCF_BIDI)
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return DMA_BIDIRECTIONAL;
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switch (se_cmd->data_direction) {
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case DMA_TO_DEVICE:
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return DMA_FROM_DEVICE;
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case DMA_FROM_DEVICE:
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return DMA_TO_DEVICE;
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case DMA_NONE:
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default:
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return DMA_NONE;
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}
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}
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#endif /* TARGET_CORE_FABRICH */
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