include/target/target_core_fabric.h

   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         char *(*get_fabric_name)(void);
   9         char *(*tpg_get_wwn)(struct se_portal_group *);
  10         u16 (*tpg_get_tag)(struct se_portal_group *);
  11         u32 (*tpg_get_default_depth)(struct se_portal_group *);
  12         u32 (*tpg_get_pr_transport_id)(struct se_portal_group *,
  13                                 struct se_node_acl *,
  14                                 struct t10_pr_registration *, int *,
  15                                 unsigned char *);
  16         u32 (*tpg_get_pr_transport_id_len)(struct se_portal_group *,
  17                                 struct se_node_acl *,
  18                                 struct t10_pr_registration *, int *);
  19         char *(*tpg_parse_pr_out_transport_id)(struct se_portal_group *,
  20                                 const char *, u32 *, char **);
  21         int (*tpg_check_demo_mode)(struct se_portal_group *);
  22         int (*tpg_check_demo_mode_cache)(struct se_portal_group *);
  23         int (*tpg_check_demo_mode_write_protect)(struct se_portal_group *);
  24         int (*tpg_check_prod_mode_write_protect)(struct se_portal_group *);
  25         /*
  26          * Optionally used by fabrics to allow demo-mode login, but not
  27          * expose any TPG LUNs, and return 'not connected' in standard
  28          * inquiry response
  29          */
  30         int (*tpg_check_demo_mode_login_only)(struct se_portal_group *);
  31         /*
  32          * Optionally used as a configfs tunable to determine when
  33          * target-core should signal the PROTECT=1 feature bit for
  34          * backends that don't support T10-PI, so that either fabric
  35          * HW offload or target-core emulation performs the associated
  36          * WRITE_STRIP and READ_INSERT operations.
  37          */
  38         int (*tpg_check_prot_fabric_only)(struct se_portal_group *);
  39         u32 (*tpg_get_inst_index)(struct se_portal_group *);
  40         /*
  41          * Optional to release struct se_cmd and fabric dependent allocated
  42          * I/O descriptor in transport_cmd_check_stop().
  43          *
  44          * Returning 1 will signal a descriptor has been released.
  45          * Returning 0 will signal a descriptor has not been released.
  46          */
  47         int (*check_stop_free)(struct se_cmd *);
  48         void (*release_cmd)(struct se_cmd *);
  49         void (*put_session)(struct se_session *);
  50         /*
  51          * Called with spin_lock_bh(struct se_portal_group->session_lock held.
  52          */
  53         int (*shutdown_session)(struct se_session *);
  54         void (*close_session)(struct se_session *);
  55         u32 (*sess_get_index)(struct se_session *);
  56         /*
  57          * Used only for SCSI fabrics that contain multi-value TransportIDs
  58          * (like iSCSI).  All other SCSI fabrics should set this to NULL.
  59          */
  60         u32 (*sess_get_initiator_sid)(struct se_session *,
  61                                       unsigned char *, u32);
  62         int (*write_pending)(struct se_cmd *);
  63         int (*write_pending_status)(struct se_cmd *);
  64         void (*set_default_node_attributes)(struct se_node_acl *);
  65         u32 (*get_task_tag)(struct se_cmd *);
  66         int (*get_cmd_state)(struct se_cmd *);
  67         int (*queue_data_in)(struct se_cmd *);
  68         int (*queue_status)(struct se_cmd *);
  69         void (*queue_tm_rsp)(struct se_cmd *);
  70         void (*aborted_task)(struct se_cmd *);
  71         /*
  72          * fabric module calls for target_core_fabric_configfs.c
  73          */
  74         struct se_wwn *(*fabric_make_wwn)(struct target_fabric_configfs *,
  75                                 struct config_group *, const char *);
  76         void (*fabric_drop_wwn)(struct se_wwn *);
  77         struct se_portal_group *(*fabric_make_tpg)(struct se_wwn *,
  78                                 struct config_group *, const char *);
  79         void (*fabric_drop_tpg)(struct se_portal_group *);
  80         int (*fabric_post_link)(struct se_portal_group *,
  81                                 struct se_lun *);
  82         void (*fabric_pre_unlink)(struct se_portal_group *,
  83                                 struct se_lun *);
  84         struct se_tpg_np *(*fabric_make_np)(struct se_portal_group *,
  85                                 struct config_group *, const char *);
  86         void (*fabric_drop_np)(struct se_tpg_np *);
  87         int (*fabric_init_nodeacl)(struct se_node_acl *, const char *);
  88         void (*fabric_cleanup_nodeacl)(struct se_node_acl *);
  89
  90         struct configfs_attribute **tfc_discovery_attrs;
  91         struct configfs_attribute **tfc_wwn_attrs;
  92         struct configfs_attribute **tfc_tpg_base_attrs;
  93         struct configfs_attribute **tfc_tpg_np_base_attrs;
  94         struct configfs_attribute **tfc_tpg_attrib_attrs;
  95         struct configfs_attribute **tfc_tpg_auth_attrs;
  96         struct configfs_attribute **tfc_tpg_param_attrs;
  97         struct configfs_attribute **tfc_tpg_nacl_base_attrs;
  98         struct configfs_attribute **tfc_tpg_nacl_attrib_attrs;
  99         struct configfs_attribute **tfc_tpg_nacl_auth_attrs;
 100         struct configfs_attribute **tfc_tpg_nacl_param_attrs;
 101 };
 102
 103 int target_register_template(const struct target_core_fabric_ops *fo);
 104 void target_unregister_template(const struct target_core_fabric_ops *fo);
 105
 106 int target_depend_item(struct config_item *item);
 107 void target_undepend_item(struct config_item *item);
 108
 109 struct se_session *transport_init_session(enum target_prot_op);
 110 int transport_alloc_session_tags(struct se_session *, unsigned int,
 111                 unsigned int);
 112 struct se_session *transport_init_session_tags(unsigned int, unsigned int,
 113                 enum target_prot_op);
 114 void    __transport_register_session(struct se_portal_group *,
 115                 struct se_node_acl *, struct se_session *, void *);
 116 void    transport_register_session(struct se_portal_group *,
 117                 struct se_node_acl *, struct se_session *, void *);
 118 void    target_get_session(struct se_session *);
 119 void    target_put_session(struct se_session *);
 120 ssize_t target_show_dynamic_sessions(struct se_portal_group *, char *);
 121 void    transport_free_session(struct se_session *);
 122 void    target_put_nacl(struct se_node_acl *);
 123 void    transport_deregister_session_configfs(struct se_session *);
 124 void    transport_deregister_session(struct se_session *);
 125
 126
 127 void    transport_init_se_cmd(struct se_cmd *,
 128                 const struct target_core_fabric_ops *,
 129                 struct se_session *, u32, int, int, unsigned char *);
 130 sense_reason_t transport_lookup_cmd_lun(struct se_cmd *, u32);
 131 sense_reason_t target_setup_cmd_from_cdb(struct se_cmd *, unsigned char *);
 132 int     target_submit_cmd_map_sgls(struct se_cmd *, struct se_session *,
 133                 unsigned char *, unsigned char *, u32, u32, int, int, int,
 134                 struct scatterlist *, u32, struct scatterlist *, u32,
 135                 struct scatterlist *, u32);
 136 int     target_submit_cmd(struct se_cmd *, struct se_session *, unsigned char *,
 137                 unsigned char *, u32, u32, int, int, int);
 138 int     target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
 139                 unsigned char *sense, u32 unpacked_lun,
 140                 void *fabric_tmr_ptr, unsigned char tm_type,
 141                 gfp_t, unsigned int, int);
 142 int     transport_handle_cdb_direct(struct se_cmd *);
 143 sense_reason_t  transport_generic_new_cmd(struct se_cmd *);
 144
 145 void    target_execute_cmd(struct se_cmd *cmd);
 146
 147 int     transport_generic_free_cmd(struct se_cmd *, int);
 148
 149 bool    transport_wait_for_tasks(struct se_cmd *);
 150 int     transport_check_aborted_status(struct se_cmd *, int);
 151 int     transport_send_check_condition_and_sense(struct se_cmd *,
 152                 sense_reason_t, int);
 153 int     target_get_sess_cmd(struct se_cmd *, bool);
 154 int     target_put_sess_cmd(struct se_cmd *);
 155 void    target_sess_cmd_list_set_waiting(struct se_session *);
 156 void    target_wait_for_sess_cmds(struct se_session *);
 157
 158 int     core_alua_check_nonop_delay(struct se_cmd *);
 159
 160 int     core_tmr_alloc_req(struct se_cmd *, void *, u8, gfp_t);
 161 void    core_tmr_release_req(struct se_tmr_req *);
 162 int     transport_generic_handle_tmr(struct se_cmd *);
 163 void    transport_generic_request_failure(struct se_cmd *, sense_reason_t);
 164 void    __target_execute_cmd(struct se_cmd *);
 165 int     transport_lookup_tmr_lun(struct se_cmd *, u32);
 166
 167 struct se_node_acl *core_tpg_get_initiator_node_acl(struct se_portal_group *tpg,
 168                 unsigned char *);
 169 struct se_node_acl *core_tpg_check_initiator_node_acl(struct se_portal_group *,
 170                 unsigned char *);
 171 void    core_tpg_clear_object_luns(struct se_portal_group *);
 172 int     core_tpg_set_initiator_node_queue_depth(struct se_portal_group *,
 173                 unsigned char *, u32, int);
 174 int     core_tpg_set_initiator_node_tag(struct se_portal_group *,
 175                 struct se_node_acl *, const char *);
 176 int     core_tpg_register(const struct target_core_fabric_ops *,
 177                 struct se_wwn *, struct se_portal_group *, int);
 178 int     core_tpg_deregister(struct se_portal_group *);
 179
 180 /* SAS helpers */
 181 u32     sas_get_pr_transport_id(struct se_portal_group *, struct se_node_acl *,
 182                 struct t10_pr_registration *, int *, unsigned char *);
 183 u32     sas_get_pr_transport_id_len(struct se_portal_group *, struct se_node_acl *,
 184                 struct t10_pr_registration *, int *);
 185 char    *sas_parse_pr_out_transport_id(struct se_portal_group *, const char *,
 186                 u32 *, char **);
 187
 188 /* FC helpers */
 189 u32     fc_get_pr_transport_id(struct se_portal_group *, struct se_node_acl *,
 190                 struct t10_pr_registration *, int *, unsigned char *);
 191 u32     fc_get_pr_transport_id_len(struct se_portal_group *, struct se_node_acl *,
 192                 struct t10_pr_registration *, int *);
 193 char    *fc_parse_pr_out_transport_id(struct se_portal_group *, const char *,
 194                 u32 *, char **);
 195
 196 /* iSCSI helpers */
 197 u32     iscsi_get_pr_transport_id(struct se_portal_group *, struct se_node_acl *,
 198                 struct t10_pr_registration *, int *, unsigned char *);
 199 u32     iscsi_get_pr_transport_id_len(struct se_portal_group *, struct se_node_acl *,
 200                 struct t10_pr_registration *, int *);
 201 char    *iscsi_parse_pr_out_transport_id(struct se_portal_group *, const char *,
 202                 u32 *, char **);
 203
 204 /*
 205  * The LIO target core uses DMA_TO_DEVICE to mean that data is going
 206  * to the target (eg handling a WRITE) and DMA_FROM_DEVICE to mean
 207  * that data is coming from the target (eg handling a READ).  However,
 208  * this is just the opposite of what we have to tell the DMA mapping
 209  * layer -- eg when handling a READ, the HBA will have to DMA the data
 210  * out of memory so it can send it to the initiator, which means we
 211  * need to use DMA_TO_DEVICE when we map the data.
 212  */
 213 static inline enum dma_data_direction
 214 target_reverse_dma_direction(struct se_cmd *se_cmd)
 215 {
 216         if (se_cmd->se_cmd_flags & SCF_BIDI)
 217                 return DMA_BIDIRECTIONAL;
 218
 219         switch (se_cmd->data_direction) {
 220         case DMA_TO_DEVICE:
 221                 return DMA_FROM_DEVICE;
 222         case DMA_FROM_DEVICE:
 223                 return DMA_TO_DEVICE;
 224         case DMA_NONE:
 225         default:
 226                 return DMA_NONE;
 227         }
 228 }
 229
 230 #endif /* TARGET_CORE_FABRICH */