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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
9struct 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
106int target_register_template(const struct target_core_fabric_ops *fo);
107void target_unregister_template(const struct target_core_fabric_ops *fo);
108
109int target_depend_item(struct config_item *item);
110void target_undepend_item(struct config_item *item);
111
112struct 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
118struct se_session *transport_init_session(enum target_prot_op);
119int transport_alloc_session_tags(struct se_session *, unsigned int,
120 unsigned int);
121struct se_session *transport_init_session_tags(unsigned int, unsigned int,
122 enum target_prot_op);
123void __transport_register_session(struct se_portal_group *,
124 struct se_node_acl *, struct se_session *, void *);
125void transport_register_session(struct se_portal_group *,
126 struct se_node_acl *, struct se_session *, void *);
127ssize_t target_show_dynamic_sessions(struct se_portal_group *, char *);
128void transport_free_session(struct se_session *);
129void target_put_nacl(struct se_node_acl *);
130void transport_deregister_session_configfs(struct se_session *);
131void transport_deregister_session(struct se_session *);
132
133
134void transport_init_se_cmd(struct se_cmd *,
135 const struct target_core_fabric_ops *,
136 struct se_session *, u32, int, int, unsigned char *);
137sense_reason_t transport_lookup_cmd_lun(struct se_cmd *, u64);
138sense_reason_t target_setup_cmd_from_cdb(struct se_cmd *, unsigned char *);
139int 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);
143int target_submit_cmd(struct se_cmd *, struct se_session *, unsigned char *,
144 unsigned char *, u64, u32, int, int, int);
145int 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);
149int transport_handle_cdb_direct(struct se_cmd *);
150sense_reason_t transport_generic_new_cmd(struct se_cmd *);
151
152void target_execute_cmd(struct se_cmd *cmd);
153
154int transport_generic_free_cmd(struct se_cmd *, int);
155
156bool transport_wait_for_tasks(struct se_cmd *);
157int transport_check_aborted_status(struct se_cmd *, int);
158int transport_send_check_condition_and_sense(struct se_cmd *,
159 sense_reason_t, int);
160int target_get_sess_cmd(struct se_cmd *, bool);
161int target_put_sess_cmd(struct se_cmd *);
162void target_sess_cmd_list_set_waiting(struct se_session *);
163void target_wait_for_sess_cmds(struct se_session *);
164void target_show_cmd(const char *pfx, struct se_cmd *cmd);
165
166int core_alua_check_nonop_delay(struct se_cmd *);
167
168int core_tmr_alloc_req(struct se_cmd *, void *, u8, gfp_t);
169void core_tmr_release_req(struct se_tmr_req *);
170int transport_generic_handle_tmr(struct se_cmd *);
171void transport_generic_request_failure(struct se_cmd *, sense_reason_t);
172int transport_lookup_tmr_lun(struct se_cmd *, u64);
173void core_allocate_nexus_loss_ua(struct se_node_acl *acl);
174
175struct se_node_acl *core_tpg_get_initiator_node_acl(struct se_portal_group *tpg,
176 unsigned char *);
177bool target_tpg_has_node_acl(struct se_portal_group *tpg,
178 const char *);
179struct se_node_acl *core_tpg_check_initiator_node_acl(struct se_portal_group *,
180 unsigned char *);
181int core_tpg_set_initiator_node_queue_depth(struct se_node_acl *, u32);
182int core_tpg_set_initiator_node_tag(struct se_portal_group *,
183 struct se_node_acl *, const char *);
184int core_tpg_register(struct se_wwn *, struct se_portal_group *, int);
185int core_tpg_deregister(struct se_portal_group *);
186
187int target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents,
188 u32 length, bool zero_page, bool chainable);
189void 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 */
200static inline enum dma_data_direction
201target_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 */
1#ifndef TARGET_CORE_FABRIC_H
2#define TARGET_CORE_FABRIC_H
3
4struct target_core_fabric_ops {
5 struct configfs_subsystem *tf_subsys;
6 char *(*get_fabric_name)(void);
7 u8 (*get_fabric_proto_ident)(struct se_portal_group *);
8 char *(*tpg_get_wwn)(struct se_portal_group *);
9 u16 (*tpg_get_tag)(struct se_portal_group *);
10 u32 (*tpg_get_default_depth)(struct se_portal_group *);
11 u32 (*tpg_get_pr_transport_id)(struct se_portal_group *,
12 struct se_node_acl *,
13 struct t10_pr_registration *, int *,
14 unsigned char *);
15 u32 (*tpg_get_pr_transport_id_len)(struct se_portal_group *,
16 struct se_node_acl *,
17 struct t10_pr_registration *, int *);
18 char *(*tpg_parse_pr_out_transport_id)(struct se_portal_group *,
19 const char *, u32 *, char **);
20 int (*tpg_check_demo_mode)(struct se_portal_group *);
21 int (*tpg_check_demo_mode_cache)(struct se_portal_group *);
22 int (*tpg_check_demo_mode_write_protect)(struct se_portal_group *);
23 int (*tpg_check_prod_mode_write_protect)(struct se_portal_group *);
24 /*
25 * Optionally used by fabrics to allow demo-mode login, but not
26 * expose any TPG LUNs, and return 'not connected' in standard
27 * inquiry response
28 */
29 int (*tpg_check_demo_mode_login_only)(struct se_portal_group *);
30 struct se_node_acl *(*tpg_alloc_fabric_acl)(
31 struct se_portal_group *);
32 void (*tpg_release_fabric_acl)(struct se_portal_group *,
33 struct se_node_acl *);
34 u32 (*tpg_get_inst_index)(struct se_portal_group *);
35 /*
36 * Optional to release struct se_cmd and fabric dependent allocated
37 * I/O descriptor in transport_cmd_check_stop().
38 *
39 * Returning 1 will signal a descriptor has been released.
40 * Returning 0 will signal a descriptor has not been released.
41 */
42 int (*check_stop_free)(struct se_cmd *);
43 void (*release_cmd)(struct se_cmd *);
44 void (*put_session)(struct se_session *);
45 /*
46 * Called with spin_lock_bh(struct se_portal_group->session_lock held.
47 */
48 int (*shutdown_session)(struct se_session *);
49 void (*close_session)(struct se_session *);
50 u32 (*sess_get_index)(struct se_session *);
51 /*
52 * Used only for SCSI fabrics that contain multi-value TransportIDs
53 * (like iSCSI). All other SCSI fabrics should set this to NULL.
54 */
55 u32 (*sess_get_initiator_sid)(struct se_session *,
56 unsigned char *, u32);
57 int (*write_pending)(struct se_cmd *);
58 int (*write_pending_status)(struct se_cmd *);
59 void (*set_default_node_attributes)(struct se_node_acl *);
60 u32 (*get_task_tag)(struct se_cmd *);
61 int (*get_cmd_state)(struct se_cmd *);
62 int (*queue_data_in)(struct se_cmd *);
63 int (*queue_status)(struct se_cmd *);
64 void (*queue_tm_rsp)(struct se_cmd *);
65 void (*aborted_task)(struct se_cmd *);
66 /*
67 * fabric module calls for target_core_fabric_configfs.c
68 */
69 struct se_wwn *(*fabric_make_wwn)(struct target_fabric_configfs *,
70 struct config_group *, const char *);
71 void (*fabric_drop_wwn)(struct se_wwn *);
72 struct se_portal_group *(*fabric_make_tpg)(struct se_wwn *,
73 struct config_group *, const char *);
74 void (*fabric_drop_tpg)(struct se_portal_group *);
75 int (*fabric_post_link)(struct se_portal_group *,
76 struct se_lun *);
77 void (*fabric_pre_unlink)(struct se_portal_group *,
78 struct se_lun *);
79 struct se_tpg_np *(*fabric_make_np)(struct se_portal_group *,
80 struct config_group *, const char *);
81 void (*fabric_drop_np)(struct se_tpg_np *);
82 struct se_node_acl *(*fabric_make_nodeacl)(struct se_portal_group *,
83 struct config_group *, const char *);
84 void (*fabric_drop_nodeacl)(struct se_node_acl *);
85};
86
87struct se_session *transport_init_session(enum target_prot_op);
88int transport_alloc_session_tags(struct se_session *, unsigned int,
89 unsigned int);
90struct se_session *transport_init_session_tags(unsigned int, unsigned int,
91 enum target_prot_op);
92void __transport_register_session(struct se_portal_group *,
93 struct se_node_acl *, struct se_session *, void *);
94void transport_register_session(struct se_portal_group *,
95 struct se_node_acl *, struct se_session *, void *);
96void target_get_session(struct se_session *);
97void target_put_session(struct se_session *);
98void transport_free_session(struct se_session *);
99void target_put_nacl(struct se_node_acl *);
100void transport_deregister_session_configfs(struct se_session *);
101void transport_deregister_session(struct se_session *);
102
103
104void transport_init_se_cmd(struct se_cmd *, struct target_core_fabric_ops *,
105 struct se_session *, u32, int, int, unsigned char *);
106sense_reason_t transport_lookup_cmd_lun(struct se_cmd *, u32);
107sense_reason_t target_setup_cmd_from_cdb(struct se_cmd *, unsigned char *);
108int target_submit_cmd_map_sgls(struct se_cmd *, struct se_session *,
109 unsigned char *, unsigned char *, u32, u32, int, int, int,
110 struct scatterlist *, u32, struct scatterlist *, u32,
111 struct scatterlist *, u32);
112int target_submit_cmd(struct se_cmd *, struct se_session *, unsigned char *,
113 unsigned char *, u32, u32, int, int, int);
114int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
115 unsigned char *sense, u32 unpacked_lun,
116 void *fabric_tmr_ptr, unsigned char tm_type,
117 gfp_t, unsigned int, int);
118int transport_handle_cdb_direct(struct se_cmd *);
119sense_reason_t transport_generic_new_cmd(struct se_cmd *);
120
121void target_execute_cmd(struct se_cmd *cmd);
122
123int transport_generic_free_cmd(struct se_cmd *, int);
124
125bool transport_wait_for_tasks(struct se_cmd *);
126int transport_check_aborted_status(struct se_cmd *, int);
127int transport_send_check_condition_and_sense(struct se_cmd *,
128 sense_reason_t, int);
129int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
130int target_put_sess_cmd(struct se_session *, struct se_cmd *);
131void target_sess_cmd_list_set_waiting(struct se_session *);
132void target_wait_for_sess_cmds(struct se_session *);
133
134int core_alua_check_nonop_delay(struct se_cmd *);
135
136int core_tmr_alloc_req(struct se_cmd *, void *, u8, gfp_t);
137void core_tmr_release_req(struct se_tmr_req *);
138int transport_generic_handle_tmr(struct se_cmd *);
139void transport_generic_request_failure(struct se_cmd *, sense_reason_t);
140void __target_execute_cmd(struct se_cmd *);
141int transport_lookup_tmr_lun(struct se_cmd *, u32);
142
143struct se_node_acl *core_tpg_get_initiator_node_acl(struct se_portal_group *tpg,
144 unsigned char *);
145struct se_node_acl *core_tpg_check_initiator_node_acl(struct se_portal_group *,
146 unsigned char *);
147void core_tpg_clear_object_luns(struct se_portal_group *);
148struct se_node_acl *core_tpg_add_initiator_node_acl(struct se_portal_group *,
149 struct se_node_acl *, const char *, u32);
150int core_tpg_del_initiator_node_acl(struct se_portal_group *,
151 struct se_node_acl *, int);
152int core_tpg_set_initiator_node_queue_depth(struct se_portal_group *,
153 unsigned char *, u32, int);
154int core_tpg_set_initiator_node_tag(struct se_portal_group *,
155 struct se_node_acl *, const char *);
156int core_tpg_register(struct target_core_fabric_ops *, struct se_wwn *,
157 struct se_portal_group *, void *, int);
158int core_tpg_deregister(struct se_portal_group *);
159
160/* SAS helpers */
161u8 sas_get_fabric_proto_ident(struct se_portal_group *);
162u32 sas_get_pr_transport_id(struct se_portal_group *, struct se_node_acl *,
163 struct t10_pr_registration *, int *, unsigned char *);
164u32 sas_get_pr_transport_id_len(struct se_portal_group *, struct se_node_acl *,
165 struct t10_pr_registration *, int *);
166char *sas_parse_pr_out_transport_id(struct se_portal_group *, const char *,
167 u32 *, char **);
168
169/* FC helpers */
170u8 fc_get_fabric_proto_ident(struct se_portal_group *);
171u32 fc_get_pr_transport_id(struct se_portal_group *, struct se_node_acl *,
172 struct t10_pr_registration *, int *, unsigned char *);
173u32 fc_get_pr_transport_id_len(struct se_portal_group *, struct se_node_acl *,
174 struct t10_pr_registration *, int *);
175char *fc_parse_pr_out_transport_id(struct se_portal_group *, const char *,
176 u32 *, char **);
177
178/* iSCSI helpers */
179u8 iscsi_get_fabric_proto_ident(struct se_portal_group *);
180u32 iscsi_get_pr_transport_id(struct se_portal_group *, struct se_node_acl *,
181 struct t10_pr_registration *, int *, unsigned char *);
182u32 iscsi_get_pr_transport_id_len(struct se_portal_group *, struct se_node_acl *,
183 struct t10_pr_registration *, int *);
184char *iscsi_parse_pr_out_transport_id(struct se_portal_group *, const char *,
185 u32 *, char **);
186
187/*
188 * The LIO target core uses DMA_TO_DEVICE to mean that data is going
189 * to the target (eg handling a WRITE) and DMA_FROM_DEVICE to mean
190 * that data is coming from the target (eg handling a READ). However,
191 * this is just the opposite of what we have to tell the DMA mapping
192 * layer -- eg when handling a READ, the HBA will have to DMA the data
193 * out of memory so it can send it to the initiator, which means we
194 * need to use DMA_TO_DEVICE when we map the data.
195 */
196static inline enum dma_data_direction
197target_reverse_dma_direction(struct se_cmd *se_cmd)
198{
199 if (se_cmd->se_cmd_flags & SCF_BIDI)
200 return DMA_BIDIRECTIONAL;
201
202 switch (se_cmd->data_direction) {
203 case DMA_TO_DEVICE:
204 return DMA_FROM_DEVICE;
205 case DMA_FROM_DEVICE:
206 return DMA_TO_DEVICE;
207 case DMA_NONE:
208 default:
209 return DMA_NONE;
210 }
211}
212
213#endif /* TARGET_CORE_FABRICH */