include/target/target_core_fabric.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef TARGET_CORE_FABRIC_H
   3 #define TARGET_CORE_FABRIC_H
   4
   5 #include <linux/configfs.h>
   6 #include <linux/types.h>
   7 #include <target/target_core_base.h>
   8
   9 struct target_core_fabric_ops {
  10         struct module *module;
  11         const char *name;
  12         size_t node_acl_size;
  13         /*
  14          * Limits number of scatterlist entries per SCF_SCSI_DATA_CDB payload.
  15          * Setting this value tells target-core to enforce this limit, and
  16          * report as INQUIRY EVPD=b0 MAXIMUM TRANSFER LENGTH.
  17          *
  18          * target-core will currently reset se_cmd->data_length to this
  19          * maximum size, and set UNDERFLOW residual count if length exceeds
  20          * this limit.
  21          *
  22          * XXX: Not all initiator hosts honor this block-limit EVPD
  23          * XXX: Currently assumes single PAGE_SIZE per scatterlist entry
  24          */
  25         u32 max_data_sg_nents;
  26         char *(*get_fabric_name)(void);
  27         char *(*tpg_get_wwn)(struct se_portal_group *);
  28         u16 (*tpg_get_tag)(struct se_portal_group *);
  29         u32 (*tpg_get_default_depth)(struct se_portal_group *);
  30         int (*tpg_check_demo_mode)(struct se_portal_group *);
  31         int (*tpg_check_demo_mode_cache)(struct se_portal_group *);
  32         int (*tpg_check_demo_mode_write_protect)(struct se_portal_group *);
  33         int (*tpg_check_prod_mode_write_protect)(struct se_portal_group *);
  34         /*
  35          * Optionally used by fabrics to allow demo-mode login, but not
  36          * expose any TPG LUNs, and return 'not connected' in standard
  37          * inquiry response
  38          */
  39         int (*tpg_check_demo_mode_login_only)(struct se_portal_group *);
  40         /*
  41          * Optionally used as a configfs tunable to determine when
  42          * target-core should signal the PROTECT=1 feature bit for
  43          * backends that don't support T10-PI, so that either fabric
  44          * HW offload or target-core emulation performs the associated
  45          * WRITE_STRIP and READ_INSERT operations.
  46          */
  47         int (*tpg_check_prot_fabric_only)(struct se_portal_group *);
  48         u32 (*tpg_get_inst_index)(struct se_portal_group *);
  49         /*
  50          * Optional to release struct se_cmd and fabric dependent allocated
  51          * I/O descriptor after command execution has finished.
  52          *
  53          * Returning 1 will signal a descriptor has been released.
  54          * Returning 0 will signal a descriptor has not been released.
  55          */
  56         int (*check_stop_free)(struct se_cmd *);
  57         void (*release_cmd)(struct se_cmd *);
  58         void (*close_session)(struct se_session *);
  59         u32 (*sess_get_index)(struct se_session *);
  60         /*
  61          * Used only for SCSI fabrics that contain multi-value TransportIDs
  62          * (like iSCSI).  All other SCSI fabrics should set this to NULL.
  63          */
  64         u32 (*sess_get_initiator_sid)(struct se_session *,
  65                                       unsigned char *, u32);
  66         int (*write_pending)(struct se_cmd *);
  67         int (*write_pending_status)(struct se_cmd *);
  68         void (*set_default_node_attributes)(struct se_node_acl *);
  69         int (*get_cmd_state)(struct se_cmd *);
  70         int (*queue_data_in)(struct se_cmd *);
  71         int (*queue_status)(struct se_cmd *);
  72         void (*queue_tm_rsp)(struct se_cmd *);
  73         void (*aborted_task)(struct se_cmd *);
  74         /*
  75          * fabric module calls for target_core_fabric_configfs.c
  76          */
  77         struct se_wwn *(*fabric_make_wwn)(struct target_fabric_configfs *,
  78                                 struct config_group *, const char *);
  79         void (*fabric_drop_wwn)(struct se_wwn *);
  80         void (*add_wwn_groups)(struct se_wwn *);
  81         struct se_portal_group *(*fabric_make_tpg)(struct se_wwn *,
  82                                 struct config_group *, const char *);
  83         void (*fabric_drop_tpg)(struct se_portal_group *);
  84         int (*fabric_post_link)(struct se_portal_group *,
  85                                 struct se_lun *);
  86         void (*fabric_pre_unlink)(struct se_portal_group *,
  87                                 struct se_lun *);
  88         struct se_tpg_np *(*fabric_make_np)(struct se_portal_group *,
  89                                 struct config_group *, const char *);
  90         void (*fabric_drop_np)(struct se_tpg_np *);
  91         int (*fabric_init_nodeacl)(struct se_node_acl *, const char *);
  92
  93         struct configfs_attribute **tfc_discovery_attrs;
  94         struct configfs_attribute **tfc_wwn_attrs;
  95         struct configfs_attribute **tfc_tpg_base_attrs;
  96         struct configfs_attribute **tfc_tpg_np_base_attrs;
  97         struct configfs_attribute **tfc_tpg_attrib_attrs;
  98         struct configfs_attribute **tfc_tpg_auth_attrs;
  99         struct configfs_attribute **tfc_tpg_param_attrs;
 100         struct configfs_attribute **tfc_tpg_nacl_base_attrs;
 101         struct configfs_attribute **tfc_tpg_nacl_attrib_attrs;
 102         struct configfs_attribute **tfc_tpg_nacl_auth_attrs;
 103         struct configfs_attribute **tfc_tpg_nacl_param_attrs;
 104 };
 105
 106 int target_register_template(const struct target_core_fabric_ops *fo);
 107 void target_unregister_template(const struct target_core_fabric_ops *fo);
 108
 109 int target_depend_item(struct config_item *item);
 110 void target_undepend_item(struct config_item *item);
 111
 112 struct se_session *target_alloc_session(struct se_portal_group *,
 113                 unsigned int, unsigned int, enum target_prot_op prot_op,
 114                 const char *, void *,
 115                 int (*callback)(struct se_portal_group *,
 116                                 struct se_session *, void *));
 117
 118 struct se_session *transport_init_session(enum target_prot_op);
 119 int transport_alloc_session_tags(struct se_session *, unsigned int,
 120                 unsigned int);
 121 struct se_session *transport_init_session_tags(unsigned int, unsigned int,
 122                 enum target_prot_op);
 123 void    __transport_register_session(struct se_portal_group *,
 124                 struct se_node_acl *, struct se_session *, void *);
 125 void    transport_register_session(struct se_portal_group *,
 126                 struct se_node_acl *, struct se_session *, void *);
 127 ssize_t target_show_dynamic_sessions(struct se_portal_group *, char *);
 128 void    transport_free_session(struct se_session *);
 129 void    target_put_nacl(struct se_node_acl *);
 130 void    transport_deregister_session_configfs(struct se_session *);
 131 void    transport_deregister_session(struct se_session *);
 132
 133
 134 void    transport_init_se_cmd(struct se_cmd *,
 135                 const struct target_core_fabric_ops *,
 136                 struct se_session *, u32, int, int, unsigned char *);
 137 sense_reason_t transport_lookup_cmd_lun(struct se_cmd *, u64);
 138 sense_reason_t target_setup_cmd_from_cdb(struct se_cmd *, unsigned char *);
 139 int     target_submit_cmd_map_sgls(struct se_cmd *, struct se_session *,
 140                 unsigned char *, unsigned char *, u64, u32, int, int, int,
 141                 struct scatterlist *, u32, struct scatterlist *, u32,
 142                 struct scatterlist *, u32);
 143 int     target_submit_cmd(struct se_cmd *, struct se_session *, unsigned char *,
 144                 unsigned char *, u64, u32, int, int, int);
 145 int     target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
 146                 unsigned char *sense, u64 unpacked_lun,
 147                 void *fabric_tmr_ptr, unsigned char tm_type,
 148                 gfp_t, u64, int);
 149 int     transport_handle_cdb_direct(struct se_cmd *);
 150 sense_reason_t  transport_generic_new_cmd(struct se_cmd *);
 151
 152 void    target_execute_cmd(struct se_cmd *cmd);
 153
 154 int     transport_generic_free_cmd(struct se_cmd *, int);
 155
 156 bool    transport_wait_for_tasks(struct se_cmd *);
 157 int     transport_check_aborted_status(struct se_cmd *, int);
 158 int     transport_send_check_condition_and_sense(struct se_cmd *,
 159                 sense_reason_t, int);
 160 int     target_get_sess_cmd(struct se_cmd *, bool);
 161 int     target_put_sess_cmd(struct se_cmd *);
 162 void    target_sess_cmd_list_set_waiting(struct se_session *);
 163 void    target_wait_for_sess_cmds(struct se_session *);
 164 void    target_show_cmd(const char *pfx, struct se_cmd *cmd);
 165
 166 int     core_alua_check_nonop_delay(struct se_cmd *);
 167
 168 int     core_tmr_alloc_req(struct se_cmd *, void *, u8, gfp_t);
 169 void    core_tmr_release_req(struct se_tmr_req *);
 170 int     transport_generic_handle_tmr(struct se_cmd *);
 171 void    transport_generic_request_failure(struct se_cmd *, sense_reason_t);
 172 int     transport_lookup_tmr_lun(struct se_cmd *, u64);
 173 void    core_allocate_nexus_loss_ua(struct se_node_acl *acl);
 174
 175 struct se_node_acl *core_tpg_get_initiator_node_acl(struct se_portal_group *tpg,
 176                 unsigned char *);
 177 bool    target_tpg_has_node_acl(struct se_portal_group *tpg,
 178                 const char *);
 179 struct se_node_acl *core_tpg_check_initiator_node_acl(struct se_portal_group *,
 180                 unsigned char *);
 181 int     core_tpg_set_initiator_node_queue_depth(struct se_node_acl *, u32);
 182 int     core_tpg_set_initiator_node_tag(struct se_portal_group *,
 183                 struct se_node_acl *, const char *);
 184 int     core_tpg_register(struct se_wwn *, struct se_portal_group *, int);
 185 int     core_tpg_deregister(struct se_portal_group *);
 186
 187 int     target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents,
 188                 u32 length, bool zero_page, bool chainable);
 189 void    target_free_sgl(struct scatterlist *sgl, int nents);
 190
 191 /*
 192  * The LIO target core uses DMA_TO_DEVICE to mean that data is going
 193  * to the target (eg handling a WRITE) and DMA_FROM_DEVICE to mean
 194  * that data is coming from the target (eg handling a READ).  However,
 195  * this is just the opposite of what we have to tell the DMA mapping
 196  * layer -- eg when handling a READ, the HBA will have to DMA the data
 197  * out of memory so it can send it to the initiator, which means we
 198  * need to use DMA_TO_DEVICE when we map the data.
 199  */
 200 static inline enum dma_data_direction
 201 target_reverse_dma_direction(struct se_cmd *se_cmd)
 202 {
 203         if (se_cmd->se_cmd_flags & SCF_BIDI)
 204                 return DMA_BIDIRECTIONAL;
 205
 206         switch (se_cmd->data_direction) {
 207         case DMA_TO_DEVICE:
 208                 return DMA_FROM_DEVICE;
 209         case DMA_FROM_DEVICE:
 210                 return DMA_TO_DEVICE;
 211         case DMA_NONE:
 212         default:
 213                 return DMA_NONE;
 214         }
 215 }
 216
 217 #endif /* TARGET_CORE_FABRICH */