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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 | #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; const char *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 *(*get_fabric_name)(void); 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 *); int (*write_pending_status)(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 *, struct config_group *, 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; }; 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_alloc_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 *)); struct se_session *transport_init_session(enum target_prot_op); int transport_alloc_session_tags(struct se_session *, unsigned int, unsigned int); struct se_session *transport_init_session_tags(unsigned int, unsigned int, enum target_prot_op); 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_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_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_check_aborted_status(struct se_cmd *, int); int transport_send_check_condition_and_sense(struct se_cmd *, sense_reason_t, int); 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 *); 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 */ |