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TOMOYO Linux Cross Reference
Linux/include/target/target_core_fabric.h

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  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 after command execution has finished.
 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 void    target_show_cmd(const char *pfx, struct se_cmd *cmd);
164 
165 int     core_alua_check_nonop_delay(struct se_cmd *);
166 
167 int     core_tmr_alloc_req(struct se_cmd *, void *, u8, gfp_t);
168 void    core_tmr_release_req(struct se_tmr_req *);
169 int     transport_generic_handle_tmr(struct se_cmd *);
170 void    transport_generic_request_failure(struct se_cmd *, sense_reason_t);
171 int     transport_lookup_tmr_lun(struct se_cmd *, u64);
172 void    core_allocate_nexus_loss_ua(struct se_node_acl *acl);
173 
174 struct se_node_acl *core_tpg_get_initiator_node_acl(struct se_portal_group *tpg,
175                 unsigned char *);
176 bool    target_tpg_has_node_acl(struct se_portal_group *tpg,
177                 const char *);
178 struct se_node_acl *core_tpg_check_initiator_node_acl(struct se_portal_group *,
179                 unsigned char *);
180 int     core_tpg_set_initiator_node_queue_depth(struct se_node_acl *, u32);
181 int     core_tpg_set_initiator_node_tag(struct se_portal_group *,
182                 struct se_node_acl *, const char *);
183 int     core_tpg_register(struct se_wwn *, struct se_portal_group *, int);
184 int     core_tpg_deregister(struct se_portal_group *);
185 
186 int     target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents,
187                 u32 length, bool zero_page, bool chainable);
188 void    target_free_sgl(struct scatterlist *sgl, int nents);
189 
190 /*
191  * The LIO target core uses DMA_TO_DEVICE to mean that data is going
192  * to the target (eg handling a WRITE) and DMA_FROM_DEVICE to mean
193  * that data is coming from the target (eg handling a READ).  However,
194  * this is just the opposite of what we have to tell the DMA mapping
195  * layer -- eg when handling a READ, the HBA will have to DMA the data
196  * out of memory so it can send it to the initiator, which means we
197  * need to use DMA_TO_DEVICE when we map the data.
198  */
199 static inline enum dma_data_direction
200 target_reverse_dma_direction(struct se_cmd *se_cmd)
201 {
202         if (se_cmd->se_cmd_flags & SCF_BIDI)
203                 return DMA_BIDIRECTIONAL;
204 
205         switch (se_cmd->data_direction) {
206         case DMA_TO_DEVICE:
207                 return DMA_FROM_DEVICE;
208         case DMA_FROM_DEVICE:
209                 return DMA_TO_DEVICE;
210         case DMA_NONE:
211         default:
212                 return DMA_NONE;
213         }
214 }
215 
216 #endif /* TARGET_CORE_FABRICH */
217 

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