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

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef TARGET_CORE_BACKEND_H
  3 #define TARGET_CORE_BACKEND_H
  4 
  5 #include <linux/types.h>
  6 #include <asm/unaligned.h>
  7 #include <target/target_core_base.h>
  8 
  9 #define TRANSPORT_FLAG_PASSTHROUGH              0x1
 10 /*
 11  * ALUA commands, state checks and setup operations are handled by the
 12  * backend module.
 13  */
 14 #define TRANSPORT_FLAG_PASSTHROUGH_ALUA         0x2
 15 #define TRANSPORT_FLAG_PASSTHROUGH_PGR          0x4
 16 
 17 struct request_queue;
 18 struct scatterlist;
 19 
 20 struct target_backend_ops {
 21         char name[16];
 22         char inquiry_prod[16];
 23         char inquiry_rev[4];
 24         struct module *owner;
 25 
 26         u8 transport_flags_default;
 27         u8 transport_flags_changeable;
 28 
 29         int (*attach_hba)(struct se_hba *, u32);
 30         void (*detach_hba)(struct se_hba *);
 31         int (*pmode_enable_hba)(struct se_hba *, unsigned long);
 32 
 33         struct se_device *(*alloc_device)(struct se_hba *, const char *);
 34         int (*configure_device)(struct se_device *);
 35         void (*destroy_device)(struct se_device *);
 36         void (*free_device)(struct se_device *device);
 37 
 38         ssize_t (*set_configfs_dev_params)(struct se_device *,
 39                                            const char *, ssize_t);
 40         ssize_t (*show_configfs_dev_params)(struct se_device *, char *);
 41 
 42         sense_reason_t (*parse_cdb)(struct se_cmd *cmd);
 43         void (*tmr_notify)(struct se_device *se_dev, enum tcm_tmreq_table,
 44                            struct list_head *aborted_cmds);
 45         u32 (*get_device_type)(struct se_device *);
 46         sector_t (*get_blocks)(struct se_device *);
 47         sector_t (*get_alignment_offset_lbas)(struct se_device *);
 48         /* lbppbe = logical blocks per physical block exponent. see SBC-3 */
 49         unsigned int (*get_lbppbe)(struct se_device *);
 50         unsigned int (*get_io_min)(struct se_device *);
 51         unsigned int (*get_io_opt)(struct se_device *);
 52         unsigned char *(*get_sense_buffer)(struct se_cmd *);
 53         bool (*get_write_cache)(struct se_device *);
 54         int (*init_prot)(struct se_device *);
 55         int (*format_prot)(struct se_device *);
 56         void (*free_prot)(struct se_device *);
 57 
 58         struct configfs_attribute **tb_dev_attrib_attrs;
 59         struct configfs_attribute **tb_dev_action_attrs;
 60 };
 61 
 62 struct sbc_ops {
 63         sense_reason_t (*execute_rw)(struct se_cmd *cmd, struct scatterlist *,
 64                                      u32, enum dma_data_direction);
 65         sense_reason_t (*execute_sync_cache)(struct se_cmd *cmd);
 66         sense_reason_t (*execute_write_same)(struct se_cmd *cmd);
 67         sense_reason_t (*execute_unmap)(struct se_cmd *cmd,
 68                                 sector_t lba, sector_t nolb);
 69 };
 70 
 71 int     transport_backend_register(const struct target_backend_ops *);
 72 void    target_backend_unregister(const struct target_backend_ops *);
 73 
 74 void    target_complete_cmd(struct se_cmd *, u8);
 75 void    target_set_cmd_data_length(struct se_cmd *, int);
 76 void    target_complete_cmd_with_length(struct se_cmd *, u8, int);
 77 
 78 void    transport_copy_sense_to_cmd(struct se_cmd *, unsigned char *);
 79 
 80 sense_reason_t  spc_parse_cdb(struct se_cmd *cmd, unsigned int *size);
 81 sense_reason_t  spc_emulate_report_luns(struct se_cmd *cmd);
 82 sense_reason_t  spc_emulate_inquiry_std(struct se_cmd *, unsigned char *);
 83 sense_reason_t  spc_emulate_evpd_83(struct se_cmd *, unsigned char *);
 84 
 85 sense_reason_t  sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops);
 86 u32     sbc_get_device_rev(struct se_device *dev);
 87 u32     sbc_get_device_type(struct se_device *dev);
 88 sector_t        sbc_get_write_same_sectors(struct se_cmd *cmd);
 89 void    sbc_dif_generate(struct se_cmd *);
 90 sense_reason_t  sbc_dif_verify(struct se_cmd *, sector_t, unsigned int,
 91                                      unsigned int, struct scatterlist *, int);
 92 void sbc_dif_copy_prot(struct se_cmd *, unsigned int, bool,
 93                        struct scatterlist *, int);
 94 void    transport_set_vpd_proto_id(struct t10_vpd *, unsigned char *);
 95 int     transport_set_vpd_assoc(struct t10_vpd *, unsigned char *);
 96 int     transport_set_vpd_ident_type(struct t10_vpd *, unsigned char *);
 97 int     transport_set_vpd_ident(struct t10_vpd *, unsigned char *);
 98 
 99 extern struct configfs_attribute *sbc_attrib_attrs[];
100 extern struct configfs_attribute *passthrough_attrib_attrs[];
101 extern struct configfs_attribute *passthrough_pr_attrib_attrs[];
102 
103 /* core helpers also used by command snooping in pscsi */
104 void    *transport_kmap_data_sg(struct se_cmd *);
105 void    transport_kunmap_data_sg(struct se_cmd *);
106 /* core helpers also used by xcopy during internal command setup */
107 sense_reason_t  transport_generic_map_mem_to_cmd(struct se_cmd *,
108                 struct scatterlist *, u32, struct scatterlist *, u32);
109 
110 bool    target_lun_is_rdonly(struct se_cmd *);
111 sense_reason_t passthrough_parse_cdb(struct se_cmd *cmd,
112         sense_reason_t (*exec_cmd)(struct se_cmd *cmd));
113 
114 bool target_sense_desc_format(struct se_device *dev);
115 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb);
116 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
117                                        struct request_queue *q);
118 
119 static inline bool target_dev_configured(struct se_device *se_dev)
120 {
121         return !!(se_dev->dev_flags & DF_CONFIGURED);
122 }
123 
124 #endif /* TARGET_CORE_BACKEND_H */
125 

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