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 /*
12 * XXX: Special case for iscsi/iSCSI...
13 * If non-null, fabric_alias is used for matching target/$fabric
14 * ConfigFS paths. If null, fabric_name is used for this (see below).
15 */
16 const char *fabric_alias;
17 /*
18 * fabric_name is used for matching target/$fabric ConfigFS paths
19 * without a fabric_alias (see above). It's also used for the ALUA state
20 * path and is stored on disk with PR state.
21 */
22 const char *fabric_name;
23 size_t node_acl_size;
24 /*
25 * Limits number of scatterlist entries per SCF_SCSI_DATA_CDB payload.
26 * Setting this value tells target-core to enforce this limit, and
27 * report as INQUIRY EVPD=b0 MAXIMUM TRANSFER LENGTH.
28 *
29 * target-core will currently reset se_cmd->data_length to this
30 * maximum size, and set UNDERFLOW residual count if length exceeds
31 * this limit.
32 *
33 * XXX: Not all initiator hosts honor this block-limit EVPD
34 * XXX: Currently assumes single PAGE_SIZE per scatterlist entry
35 */
36 u32 max_data_sg_nents;
37 char *(*tpg_get_wwn)(struct se_portal_group *);
38 u16 (*tpg_get_tag)(struct se_portal_group *);
39 u32 (*tpg_get_default_depth)(struct se_portal_group *);
40 int (*tpg_check_demo_mode)(struct se_portal_group *);
41 int (*tpg_check_demo_mode_cache)(struct se_portal_group *);
42 int (*tpg_check_demo_mode_write_protect)(struct se_portal_group *);
43 int (*tpg_check_prod_mode_write_protect)(struct se_portal_group *);
44 /*
45 * Optionally used by fabrics to allow demo-mode login, but not
46 * expose any TPG LUNs, and return 'not connected' in standard
47 * inquiry response
48 */
49 int (*tpg_check_demo_mode_login_only)(struct se_portal_group *);
50 /*
51 * Optionally used as a configfs tunable to determine when
52 * target-core should signal the PROTECT=1 feature bit for
53 * backends that don't support T10-PI, so that either fabric
54 * HW offload or target-core emulation performs the associated
55 * WRITE_STRIP and READ_INSERT operations.
56 */
57 int (*tpg_check_prot_fabric_only)(struct se_portal_group *);
58 u32 (*tpg_get_inst_index)(struct se_portal_group *);
59 /*
60 * Optional to release struct se_cmd and fabric dependent allocated
61 * I/O descriptor after command execution has finished.
62 *
63 * Returning 1 will signal a descriptor has been released.
64 * Returning 0 will signal a descriptor has not been released.
65 */
66 int (*check_stop_free)(struct se_cmd *);
67 void (*release_cmd)(struct se_cmd *);
68 void (*close_session)(struct se_session *);
69 u32 (*sess_get_index)(struct se_session *);
70 /*
71 * Used only for SCSI fabrics that contain multi-value TransportIDs
72 * (like iSCSI). All other SCSI fabrics should set this to NULL.
73 */
74 u32 (*sess_get_initiator_sid)(struct se_session *,
75 unsigned char *, u32);
76 int (*write_pending)(struct se_cmd *);
77 void (*set_default_node_attributes)(struct se_node_acl *);
78 int (*get_cmd_state)(struct se_cmd *);
79 int (*queue_data_in)(struct se_cmd *);
80 int (*queue_status)(struct se_cmd *);
81 void (*queue_tm_rsp)(struct se_cmd *);
82 void (*aborted_task)(struct se_cmd *);
83 /*
84 * fabric module calls for target_core_fabric_configfs.c
85 */
86 struct se_wwn *(*fabric_make_wwn)(struct target_fabric_configfs *,
87 struct config_group *, const char *);
88 void (*fabric_drop_wwn)(struct se_wwn *);
89 void (*add_wwn_groups)(struct se_wwn *);
90 struct se_portal_group *(*fabric_make_tpg)(struct se_wwn *,
91 const char *);
92 void (*fabric_drop_tpg)(struct se_portal_group *);
93 int (*fabric_post_link)(struct se_portal_group *,
94 struct se_lun *);
95 void (*fabric_pre_unlink)(struct se_portal_group *,
96 struct se_lun *);
97 struct se_tpg_np *(*fabric_make_np)(struct se_portal_group *,
98 struct config_group *, const char *);
99 void (*fabric_drop_np)(struct se_tpg_np *);
100 int (*fabric_init_nodeacl)(struct se_node_acl *, const char *);
101
102 struct configfs_attribute **tfc_discovery_attrs;
103 struct configfs_attribute **tfc_wwn_attrs;
104 struct configfs_attribute **tfc_tpg_base_attrs;
105 struct configfs_attribute **tfc_tpg_np_base_attrs;
106 struct configfs_attribute **tfc_tpg_attrib_attrs;
107 struct configfs_attribute **tfc_tpg_auth_attrs;
108 struct configfs_attribute **tfc_tpg_param_attrs;
109 struct configfs_attribute **tfc_tpg_nacl_base_attrs;
110 struct configfs_attribute **tfc_tpg_nacl_attrib_attrs;
111 struct configfs_attribute **tfc_tpg_nacl_auth_attrs;
112 struct configfs_attribute **tfc_tpg_nacl_param_attrs;
113
114 /*
115 * Set this member variable to true if the SCSI transport protocol
116 * (e.g. iSCSI) requires that the Data-Out buffer is transferred in
117 * its entirety before a command is aborted.
118 */
119 bool write_pending_must_be_called;
120 };
121
122 int target_register_template(const struct target_core_fabric_ops *fo);
123 void target_unregister_template(const struct target_core_fabric_ops *fo);
124
125 int target_depend_item(struct config_item *item);
126 void target_undepend_item(struct config_item *item);
127
128 struct se_session *target_setup_session(struct se_portal_group *,
129 unsigned int, unsigned int, enum target_prot_op prot_op,
130 const char *, void *,
131 int (*callback)(struct se_portal_group *,
132 struct se_session *, void *));
133 void target_remove_session(struct se_session *);
134
135 int transport_init_session(struct se_session *se_sess);
136 struct se_session *transport_alloc_session(enum target_prot_op);
137 int transport_alloc_session_tags(struct se_session *, unsigned int,
138 unsigned int);
139 void __transport_register_session(struct se_portal_group *,
140 struct se_node_acl *, struct se_session *, void *);
141 void transport_register_session(struct se_portal_group *,
142 struct se_node_acl *, struct se_session *, void *);
143 ssize_t target_show_dynamic_sessions(struct se_portal_group *, char *);
144 void transport_free_session(struct se_session *);
145 void target_spc2_release(struct se_node_acl *nacl);
146 void target_put_nacl(struct se_node_acl *);
147 void transport_deregister_session_configfs(struct se_session *);
148 void transport_deregister_session(struct se_session *);
149
150
151 void transport_init_se_cmd(struct se_cmd *,
152 const struct target_core_fabric_ops *,
153 struct se_session *, u32, int, int, unsigned char *);
154 sense_reason_t transport_lookup_cmd_lun(struct se_cmd *, u64);
155 sense_reason_t target_setup_cmd_from_cdb(struct se_cmd *, unsigned char *);
156 int target_submit_cmd_map_sgls(struct se_cmd *, struct se_session *,
157 unsigned char *, unsigned char *, u64, u32, int, int, int,
158 struct scatterlist *, u32, struct scatterlist *, u32,
159 struct scatterlist *, u32);
160 int target_submit_cmd(struct se_cmd *, struct se_session *, unsigned char *,
161 unsigned char *, u64, u32, int, int, int);
162 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
163 unsigned char *sense, u64 unpacked_lun,
164 void *fabric_tmr_ptr, unsigned char tm_type,
165 gfp_t, u64, int);
166 int transport_handle_cdb_direct(struct se_cmd *);
167 sense_reason_t transport_generic_new_cmd(struct se_cmd *);
168
169 void target_put_cmd_and_wait(struct se_cmd *cmd);
170 void target_execute_cmd(struct se_cmd *cmd);
171
172 int transport_generic_free_cmd(struct se_cmd *, int);
173
174 bool transport_wait_for_tasks(struct se_cmd *);
175 int transport_send_check_condition_and_sense(struct se_cmd *,
176 sense_reason_t, int);
177 int target_send_busy(struct se_cmd *cmd);
178 int target_get_sess_cmd(struct se_cmd *, bool);
179 int target_put_sess_cmd(struct se_cmd *);
180 void target_sess_cmd_list_set_waiting(struct se_session *);
181 void target_wait_for_sess_cmds(struct se_session *);
182 void target_show_cmd(const char *pfx, struct se_cmd *cmd);
183
184 int core_alua_check_nonop_delay(struct se_cmd *);
185
186 int core_tmr_alloc_req(struct se_cmd *, void *, u8, gfp_t);
187 void core_tmr_release_req(struct se_tmr_req *);
188 int transport_generic_handle_tmr(struct se_cmd *);
189 void transport_generic_request_failure(struct se_cmd *, sense_reason_t);
190 int transport_lookup_tmr_lun(struct se_cmd *, u64);
191 void core_allocate_nexus_loss_ua(struct se_node_acl *acl);
192
193 struct se_node_acl *core_tpg_get_initiator_node_acl(struct se_portal_group *tpg,
194 unsigned char *);
195 bool target_tpg_has_node_acl(struct se_portal_group *tpg,
196 const char *);
197 struct se_node_acl *core_tpg_check_initiator_node_acl(struct se_portal_group *,
198 unsigned char *);
199 int core_tpg_set_initiator_node_queue_depth(struct se_node_acl *, u32);
200 int core_tpg_set_initiator_node_tag(struct se_portal_group *,
201 struct se_node_acl *, const char *);
202 int core_tpg_register(struct se_wwn *, struct se_portal_group *, int);
203 int core_tpg_deregister(struct se_portal_group *);
204
205 int target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents,
206 u32 length, bool zero_page, bool chainable);
207 void target_free_sgl(struct scatterlist *sgl, int nents);
208
209 /*
210 * The LIO target core uses DMA_TO_DEVICE to mean that data is going
211 * to the target (eg handling a WRITE) and DMA_FROM_DEVICE to mean
212 * that data is coming from the target (eg handling a READ). However,
213 * this is just the opposite of what we have to tell the DMA mapping
214 * layer -- eg when handling a READ, the HBA will have to DMA the data
215 * out of memory so it can send it to the initiator, which means we
216 * need to use DMA_TO_DEVICE when we map the data.
217 */
218 static inline enum dma_data_direction
target_reverse_dma_direction(struct se_cmd * se_cmd)219 target_reverse_dma_direction(struct se_cmd *se_cmd)
220 {
221 if (se_cmd->se_cmd_flags & SCF_BIDI)
222 return DMA_BIDIRECTIONAL;
223
224 switch (se_cmd->data_direction) {
225 case DMA_TO_DEVICE:
226 return DMA_FROM_DEVICE;
227 case DMA_FROM_DEVICE:
228 return DMA_TO_DEVICE;
229 case DMA_NONE:
230 default:
231 return DMA_NONE;
232 }
233 }
234
235 #endif /* TARGET_CORE_FABRICH */
236
