include/target/target_core_fabric.h

   1 #ifndef TARGET_CORE_FABRIC_H
   2 #define TARGET_CORE_FABRIC_H
   3
   4 #include <linux/configfs.h>
   5 #include <linux/types.h>
   6 #include <target/target_core_base.h>
   7
   8 struct target_core_fabric_ops {
   9         struct module *module;
  10         const char *name;
  11         size_t node_acl_size;
  12         /*
  13          * Limits number of scatterlist entries per SCF_SCSI_DATA_CDB payload.
  14          * Setting this value tells target-core to enforce this limit, and
  15          * report as INQUIRY EVPD=b0 MAXIMUM TRANSFER LENGTH.
  16          *
  17          * target-core will currently reset se_cmd->data_length to this
  18          * maximum size, and set UNDERFLOW residual count if length exceeds
  19          * this limit.
  20          *
  21          * XXX: Not all initiator hosts honor this block-limit EVPD
  22          * XXX: Currently assumes single PAGE_SIZE per scatterlist entry
  23          */
  24         u32 max_data_sg_nents;
  25         char *(*get_fabric_name)(void);
  26         char *(*tpg_get_wwn)(struct se_portal_group *);
  27         u16 (*tpg_get_tag)(struct se_portal_group *);
  28         u32 (*tpg_get_default_depth)(struct se_portal_group *);
  29         int (*tpg_check_demo_mode)(struct se_portal_group *);
  30         int (*tpg_check_demo_mode_cache)(struct se_portal_group *);
  31         int (*tpg_check_demo_mode_write_protect)(struct se_portal_group *);
  32         int (*tpg_check_prod_mode_write_protect)(struct se_portal_group *);
  33         /*
  34          * Optionally used by fabrics to allow demo-mode login, but not
  35          * expose any TPG LUNs, and return 'not connected' in standard
  36          * inquiry response
  37          */
  38         int (*tpg_check_demo_mode_login_only)(struct se_portal_group *);
  39         /*
  40          * Optionally used as a configfs tunable to determine when
  41          * target-core should signal the PROTECT=1 feature bit for
  42          * backends that don't support T10-PI, so that either fabric
  43          * HW offload or target-core emulation performs the associated
  44          * WRITE_STRIP and READ_INSERT operations.
  45          */
  46         int (*tpg_check_prot_fabric_only)(struct se_portal_group *);
  47         u32 (*tpg_get_inst_index)(struct se_portal_group *);
  48         /*
  49          * Optional to release struct se_cmd and fabric dependent allocated
  50          * I/O descriptor in transport_cmd_check_stop().
  51          *
  52          * Returning 1 will signal a descriptor has been released.
  53          * Returning 0 will signal a descriptor has not been released.
  54          */
  55         int (*check_stop_free)(struct se_cmd *);
  56         void (*release_cmd)(struct se_cmd *);
  57         void (*close_session)(struct se_session *);
  58         u32 (*sess_get_index)(struct se_session *);
  59         /*
  60          * Used only for SCSI fabrics that contain multi-value TransportIDs
  61          * (like iSCSI).  All other SCSI fabrics should set this to NULL.
  62          */
  63         u32 (*sess_get_initiator_sid)(struct se_session *,
  64                                       unsigned char *, u32);
  65         int (*write_pending)(struct se_cmd *);
  66         int (*write_pending_status)(struct se_cmd *);
  67         void (*set_default_node_attributes)(struct se_node_acl *);
  68         int (*get_cmd_state)(struct se_cmd *);
  69         int (*queue_data_in)(struct se_cmd *);
  70         int (*queue_status)(struct se_cmd *);
  71         void (*queue_tm_rsp)(struct se_cmd *);
  72         void (*aborted_task)(struct se_cmd *);
  73         /*
  74          * fabric module calls for target_core_fabric_configfs.c
  75          */
  76         struct se_wwn *(*fabric_make_wwn)(struct target_fabric_configfs *,
  77                                 struct config_group *, const char *);
  78         void (*fabric_drop_wwn)(struct se_wwn *);
  79         void (*add_wwn_groups)(struct se_wwn *);
  80         struct se_portal_group *(*fabric_make_tpg)(struct se_wwn *,
  81                                 struct config_group *, const char *);
  82         void (*fabric_drop_tpg)(struct se_portal_group *);
  83         int (*fabric_post_link)(struct se_portal_group *,
  84                                 struct se_lun *);
  85         void (*fabric_pre_unlink)(struct se_portal_group *,
  86                                 struct se_lun *);
  87         struct se_tpg_np *(*fabric_make_np)(struct se_portal_group *,
  88                                 struct config_group *, const char *);
  89         void (*fabric_drop_np)(struct se_tpg_np *);
  90         int (*fabric_init_nodeacl)(struct se_node_acl *, const char *);
  91
  92         struct configfs_attribute **tfc_discovery_attrs;
  93         struct configfs_attribute **tfc_wwn_attrs;
  94         struct configfs_attribute **tfc_tpg_base_attrs;
  95         struct configfs_attribute **tfc_tpg_np_base_attrs;
  96         struct configfs_attribute **tfc_tpg_attrib_attrs;
  97         struct configfs_attribute **tfc_tpg_auth_attrs;
  98         struct configfs_attribute **tfc_tpg_param_attrs;
  99         struct configfs_attribute **tfc_tpg_nacl_base_attrs;
 100         struct configfs_attribute **tfc_tpg_nacl_attrib_attrs;
 101         struct configfs_attribute **tfc_tpg_nacl_auth_attrs;
 102         struct configfs_attribute **tfc_tpg_nacl_param_attrs;
 103 };
 104
 105 int target_register_template(const struct target_core_fabric_ops *fo);
 106 void target_unregister_template(const struct target_core_fabric_ops *fo);
 107
 108 int target_depend_item(struct config_item *item);
 109 void target_undepend_item(struct config_item *item);
 110
 111 struct se_session *target_alloc_session(struct se_portal_group *,
 112                 unsigned int, unsigned int, enum target_prot_op prot_op,
 113                 const char *, void *,
 114                 int (*callback)(struct se_portal_group *,
 115                                 struct se_session *, void *));
 116
 117 struct se_session *transport_init_session(enum target_prot_op);
 118 int transport_alloc_session_tags(struct se_session *, unsigned int,
 119                 unsigned int);
 120 struct se_session *transport_init_session_tags(unsigned int, unsigned int,
 121                 enum target_prot_op);
 122 void    __transport_register_session(struct se_portal_group *,
 123                 struct se_node_acl *, struct se_session *, void *);
 124 void    transport_register_session(struct se_portal_group *,
 125                 struct se_node_acl *, struct se_session *, void *);
 126 ssize_t target_show_dynamic_sessions(struct se_portal_group *, char *);
 127 void    transport_free_session(struct se_session *);
 128 void    target_put_nacl(struct se_node_acl *);
 129 void    transport_deregister_session_configfs(struct se_session *);
 130 void    transport_deregister_session(struct se_session *);
 131
 132
 133 void    transport_init_se_cmd(struct se_cmd *,
 134                 const struct target_core_fabric_ops *,
 135                 struct se_session *, u32, int, int, unsigned char *);
 136 sense_reason_t transport_lookup_cmd_lun(struct se_cmd *, u64);
 137 sense_reason_t target_setup_cmd_from_cdb(struct se_cmd *, unsigned char *);
 138 int     target_submit_cmd_map_sgls(struct se_cmd *, struct se_session *,
 139                 unsigned char *, unsigned char *, u64, u32, int, int, int,
 140                 struct scatterlist *, u32, struct scatterlist *, u32,
 141                 struct scatterlist *, u32);
 142 int     target_submit_cmd(struct se_cmd *, struct se_session *, unsigned char *,
 143                 unsigned char *, u64, u32, int, int, int);
 144 int     target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
 145                 unsigned char *sense, u64 unpacked_lun,
 146                 void *fabric_tmr_ptr, unsigned char tm_type,
 147                 gfp_t, u64, int);
 148 int     transport_handle_cdb_direct(struct se_cmd *);
 149 sense_reason_t  transport_generic_new_cmd(struct se_cmd *);
 150
 151 void    target_execute_cmd(struct se_cmd *cmd);
 152
 153 int     transport_generic_free_cmd(struct se_cmd *, int);
 154
 155 bool    transport_wait_for_tasks(struct se_cmd *);
 156 int     transport_check_aborted_status(struct se_cmd *, int);
 157 int     transport_send_check_condition_and_sense(struct se_cmd *,
 158                 sense_reason_t, int);
 159 int     target_get_sess_cmd(struct se_cmd *, bool);
 160 int     target_put_sess_cmd(struct se_cmd *);
 161 void    target_sess_cmd_list_set_waiting(struct se_session *);
 162 void    target_wait_for_sess_cmds(struct se_session *);
 163
 164 int     core_alua_check_nonop_delay(struct se_cmd *);
 165
 166 int     core_tmr_alloc_req(struct se_cmd *, void *, u8, gfp_t);
 167 void    core_tmr_release_req(struct se_tmr_req *);
 168 int     transport_generic_handle_tmr(struct se_cmd *);
 169 void    transport_generic_request_failure(struct se_cmd *, sense_reason_t);
 170 int     transport_lookup_tmr_lun(struct se_cmd *, u64);
 171 void    core_allocate_nexus_loss_ua(struct se_node_acl *acl);
 172
 173 struct se_node_acl *core_tpg_get_initiator_node_acl(struct se_portal_group *tpg,
 174                 unsigned char *);
 175 bool    target_tpg_has_node_acl(struct se_portal_group *tpg,
 176                 const char *);
 177 struct se_node_acl *core_tpg_check_initiator_node_acl(struct se_portal_group *,
 178                 unsigned char *);
 179 int     core_tpg_set_initiator_node_queue_depth(struct se_node_acl *, u32);
 180 int     core_tpg_set_initiator_node_tag(struct se_portal_group *,
 181                 struct se_node_acl *, const char *);
 182 int     core_tpg_register(struct se_wwn *, struct se_portal_group *, int);
 183 int     core_tpg_deregister(struct se_portal_group *);
 184
 185 int     target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents,
 186                 u32 length, bool zero_page, bool chainable);
 187 void    target_free_sgl(struct scatterlist *sgl, int nents);
 188
 189 /*
 190  * The LIO target core uses DMA_TO_DEVICE to mean that data is going
 191  * to the target (eg handling a WRITE) and DMA_FROM_DEVICE to mean
 192  * that data is coming from the target (eg handling a READ).  However,
 193  * this is just the opposite of what we have to tell the DMA mapping
 194  * layer -- eg when handling a READ, the HBA will have to DMA the data
 195  * out of memory so it can send it to the initiator, which means we
 196  * need to use DMA_TO_DEVICE when we map the data.
 197  */
 198 static inline enum dma_data_direction
 199 target_reverse_dma_direction(struct se_cmd *se_cmd)
 200 {
 201         if (se_cmd->se_cmd_flags & SCF_BIDI)
 202                 return DMA_BIDIRECTIONAL;
 203
 204         switch (se_cmd->data_direction) {
 205         case DMA_TO_DEVICE:
 206                 return DMA_FROM_DEVICE;
 207         case DMA_FROM_DEVICE:
 208                 return DMA_TO_DEVICE;
 209         case DMA_NONE:
 210         default:
 211                 return DMA_NONE;
 212         }
 213 }
 214
 215 #endif /* TARGET_CORE_FABRICH */