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