1 #ifndef TARGET_CORE_FABRIC_H 2 #define TARGET_CORE_FABRIC_H 3 4 struct target_core_fabric_ops { 5 struct module *module; 6 const char *name; 7 size_t node_acl_size; 8 /* 9 * Limits number of scatterlist entries per SCF_SCSI_DATA_CDB payload. 10 * Setting this value tells target-core to enforce this limit, and 11 * report as INQUIRY EVPD=b0 MAXIMUM TRANSFER LENGTH. 12 * 13 * target-core will currently reset se_cmd->data_length to this 14 * maximum size, and set UNDERFLOW residual count if length exceeds 15 * this limit. 16 * 17 * XXX: Not all initiator hosts honor this block-limit EVPD 18 * XXX: Currently assumes single PAGE_SIZE per scatterlist entry 19 */ 20 u32 max_data_sg_nents; 21 char *(*get_fabric_name)(void); 22 char *(*tpg_get_wwn)(struct se_portal_group *); 23 u16 (*tpg_get_tag)(struct se_portal_group *); 24 u32 (*tpg_get_default_depth)(struct se_portal_group *); 25 int (*tpg_check_demo_mode)(struct se_portal_group *); 26 int (*tpg_check_demo_mode_cache)(struct se_portal_group *); 27 int (*tpg_check_demo_mode_write_protect)(struct se_portal_group *); 28 int (*tpg_check_prod_mode_write_protect)(struct se_portal_group *); 29 /* 30 * Optionally used by fabrics to allow demo-mode login, but not 31 * expose any TPG LUNs, and return 'not connected' in standard 32 * inquiry response 33 */ 34 int (*tpg_check_demo_mode_login_only)(struct se_portal_group *); 35 /* 36 * Optionally used as a configfs tunable to determine when 37 * target-core should signal the PROTECT=1 feature bit for 38 * backends that don't support T10-PI, so that either fabric 39 * HW offload or target-core emulation performs the associated 40 * WRITE_STRIP and READ_INSERT operations. 41 */ 42 int (*tpg_check_prot_fabric_only)(struct se_portal_group *); 43 u32 (*tpg_get_inst_index)(struct se_portal_group *); 44 /* 45 * Optional to release struct se_cmd and fabric dependent allocated 46 * I/O descriptor in transport_cmd_check_stop(). 47 * 48 * Returning 1 will signal a descriptor has been released. 49 * Returning 0 will signal a descriptor has not been released. 50 */ 51 int (*check_stop_free)(struct se_cmd *); 52 void (*release_cmd)(struct se_cmd *); 53 void (*close_session)(struct se_session *); 54 u32 (*sess_get_index)(struct se_session *); 55 /* 56 * Used only for SCSI fabrics that contain multi-value TransportIDs 57 * (like iSCSI). All other SCSI fabrics should set this to NULL. 58 */ 59 u32 (*sess_get_initiator_sid)(struct se_session *, 60 unsigned char *, u32); 61 int (*write_pending)(struct se_cmd *); 62 int (*write_pending_status)(struct se_cmd *); 63 void (*set_default_node_attributes)(struct se_node_acl *); 64 int (*get_cmd_state)(struct se_cmd *); 65 int (*queue_data_in)(struct se_cmd *); 66 int (*queue_status)(struct se_cmd *); 67 void (*queue_tm_rsp)(struct se_cmd *); 68 void (*aborted_task)(struct se_cmd *); 69 /* 70 * fabric module calls for target_core_fabric_configfs.c 71 */ 72 struct se_wwn *(*fabric_make_wwn)(struct target_fabric_configfs *, 73 struct config_group *, const char *); 74 void (*fabric_drop_wwn)(struct se_wwn *); 75 void (*add_wwn_groups)(struct se_wwn *); 76 struct se_portal_group *(*fabric_make_tpg)(struct se_wwn *, 77 struct config_group *, const char *); 78 void (*fabric_drop_tpg)(struct se_portal_group *); 79 int (*fabric_post_link)(struct se_portal_group *, 80 struct se_lun *); 81 void (*fabric_pre_unlink)(struct se_portal_group *, 82 struct se_lun *); 83 struct se_tpg_np *(*fabric_make_np)(struct se_portal_group *, 84 struct config_group *, const char *); 85 void (*fabric_drop_np)(struct se_tpg_np *); 86 int (*fabric_init_nodeacl)(struct se_node_acl *, const char *); 87 88 struct configfs_attribute **tfc_discovery_attrs; 89 struct configfs_attribute **tfc_wwn_attrs; 90 struct configfs_attribute **tfc_tpg_base_attrs; 91 struct configfs_attribute **tfc_tpg_np_base_attrs; 92 struct configfs_attribute **tfc_tpg_attrib_attrs; 93 struct configfs_attribute **tfc_tpg_auth_attrs; 94 struct configfs_attribute **tfc_tpg_param_attrs; 95 struct configfs_attribute **tfc_tpg_nacl_base_attrs; 96 struct configfs_attribute **tfc_tpg_nacl_attrib_attrs; 97 struct configfs_attribute **tfc_tpg_nacl_auth_attrs; 98 struct configfs_attribute **tfc_tpg_nacl_param_attrs; 99 }; 100 101 int target_register_template(const struct target_core_fabric_ops *fo); 102 void target_unregister_template(const struct target_core_fabric_ops *fo); 103 104 int target_depend_item(struct config_item *item); 105 void target_undepend_item(struct config_item *item); 106 107 struct se_session *target_alloc_session(struct se_portal_group *, 108 unsigned int, unsigned int, enum target_prot_op prot_op, 109 const char *, void *, 110 int (*callback)(struct se_portal_group *, 111 struct se_session *, void *)); 112 113 struct se_session *transport_init_session(enum target_prot_op); 114 int transport_alloc_session_tags(struct se_session *, unsigned int, 115 unsigned int); 116 struct se_session *transport_init_session_tags(unsigned int, unsigned int, 117 enum target_prot_op); 118 void __transport_register_session(struct se_portal_group *, 119 struct se_node_acl *, struct se_session *, void *); 120 void transport_register_session(struct se_portal_group *, 121 struct se_node_acl *, struct se_session *, void *); 122 ssize_t target_show_dynamic_sessions(struct se_portal_group *, char *); 123 void transport_free_session(struct se_session *); 124 void target_put_nacl(struct se_node_acl *); 125 void transport_deregister_session_configfs(struct se_session *); 126 void transport_deregister_session(struct se_session *); 127 128 129 void transport_init_se_cmd(struct se_cmd *, 130 const struct target_core_fabric_ops *, 131 struct se_session *, u32, int, int, unsigned char *); 132 sense_reason_t transport_lookup_cmd_lun(struct se_cmd *, u64); 133 sense_reason_t target_setup_cmd_from_cdb(struct se_cmd *, unsigned char *); 134 int target_submit_cmd_map_sgls(struct se_cmd *, struct se_session *, 135 unsigned char *, unsigned char *, u64, u32, int, int, int, 136 struct scatterlist *, u32, struct scatterlist *, u32, 137 struct scatterlist *, u32); 138 int target_submit_cmd(struct se_cmd *, struct se_session *, unsigned char *, 139 unsigned char *, u64, u32, int, int, int); 140 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, 141 unsigned char *sense, u64 unpacked_lun, 142 void *fabric_tmr_ptr, unsigned char tm_type, 143 gfp_t, u64, int); 144 int transport_handle_cdb_direct(struct se_cmd *); 145 sense_reason_t transport_generic_new_cmd(struct se_cmd *); 146 147 void target_execute_cmd(struct se_cmd *cmd); 148 149 int transport_generic_free_cmd(struct se_cmd *, int); 150 151 bool transport_wait_for_tasks(struct se_cmd *); 152 int transport_check_aborted_status(struct se_cmd *, int); 153 int transport_send_check_condition_and_sense(struct se_cmd *, 154 sense_reason_t, int); 155 int target_get_sess_cmd(struct se_cmd *, bool); 156 int target_put_sess_cmd(struct se_cmd *); 157 void target_sess_cmd_list_set_waiting(struct se_session *); 158 void target_wait_for_sess_cmds(struct se_session *); 159 160 int core_alua_check_nonop_delay(struct se_cmd *); 161 162 int core_tmr_alloc_req(struct se_cmd *, void *, u8, gfp_t); 163 void core_tmr_release_req(struct se_tmr_req *); 164 int transport_generic_handle_tmr(struct se_cmd *); 165 void transport_generic_request_failure(struct se_cmd *, sense_reason_t); 166 void __target_execute_cmd(struct se_cmd *); 167 int transport_lookup_tmr_lun(struct se_cmd *, u64); 168 void core_allocate_nexus_loss_ua(struct se_node_acl *acl); 169 170 struct se_node_acl *core_tpg_get_initiator_node_acl(struct se_portal_group *tpg, 171 unsigned char *); 172 bool target_tpg_has_node_acl(struct se_portal_group *tpg, 173 const char *); 174 struct se_node_acl *core_tpg_check_initiator_node_acl(struct se_portal_group *, 175 unsigned char *); 176 int core_tpg_set_initiator_node_queue_depth(struct se_node_acl *, u32); 177 int core_tpg_set_initiator_node_tag(struct se_portal_group *, 178 struct se_node_acl *, const char *); 179 int core_tpg_register(struct se_wwn *, struct se_portal_group *, int); 180 int core_tpg_deregister(struct se_portal_group *); 181 182 int target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, 183 u32 length, bool zero_page, bool chainable); 184 void target_free_sgl(struct scatterlist *sgl, int nents); 185 186 /* 187 * The LIO target core uses DMA_TO_DEVICE to mean that data is going 188 * to the target (eg handling a WRITE) and DMA_FROM_DEVICE to mean 189 * that data is coming from the target (eg handling a READ). However, 190 * this is just the opposite of what we have to tell the DMA mapping 191 * layer -- eg when handling a READ, the HBA will have to DMA the data 192 * out of memory so it can send it to the initiator, which means we 193 * need to use DMA_TO_DEVICE when we map the data. 194 */ 195 static inline enum dma_data_direction 196 target_reverse_dma_direction(struct se_cmd *se_cmd) 197 { 198 if (se_cmd->se_cmd_flags & SCF_BIDI) 199 return DMA_BIDIRECTIONAL; 200 201 switch (se_cmd->data_direction) { 202 case DMA_TO_DEVICE: 203 return DMA_FROM_DEVICE; 204 case DMA_FROM_DEVICE: 205 return DMA_TO_DEVICE; 206 case DMA_NONE: 207 default: 208 return DMA_NONE; 209 } 210 } 211 212 #endif /* TARGET_CORE_FABRICH */ 213