1 #ifndef TARGET_CORE_BACKEND_H 2 #define TARGET_CORE_BACKEND_H 3 4 #include <linux/types.h> 5 #include <asm/unaligned.h> 6 #include <target/target_core_base.h> 7 8 #define TRANSPORT_FLAG_PASSTHROUGH 0x1 9 /* 10 * ALUA commands, state checks and setup operations are handled by the 11 * backend module. 12 */ 13 #define TRANSPORT_FLAG_PASSTHROUGH_ALUA 0x2 14 #define TRANSPORT_FLAG_PASSTHROUGH_PGR 0x4 15 16 struct request_queue; 17 struct scatterlist; 18 19 struct target_backend_ops { 20 char name[16]; 21 char inquiry_prod[16]; 22 char inquiry_rev[4]; 23 struct module *owner; 24 25 u8 transport_flags; 26 27 int (*attach_hba)(struct se_hba *, u32); 28 void (*detach_hba)(struct se_hba *); 29 int (*pmode_enable_hba)(struct se_hba *, unsigned long); 30 31 struct se_device *(*alloc_device)(struct se_hba *, const char *); 32 int (*configure_device)(struct se_device *); 33 void (*destroy_device)(struct se_device *); 34 void (*free_device)(struct se_device *device); 35 36 ssize_t (*set_configfs_dev_params)(struct se_device *, 37 const char *, ssize_t); 38 ssize_t (*show_configfs_dev_params)(struct se_device *, char *); 39 40 sense_reason_t (*parse_cdb)(struct se_cmd *cmd); 41 u32 (*get_device_type)(struct se_device *); 42 sector_t (*get_blocks)(struct se_device *); 43 sector_t (*get_alignment_offset_lbas)(struct se_device *); 44 /* lbppbe = logical blocks per physical block exponent. see SBC-3 */ 45 unsigned int (*get_lbppbe)(struct se_device *); 46 unsigned int (*get_io_min)(struct se_device *); 47 unsigned int (*get_io_opt)(struct se_device *); 48 unsigned char *(*get_sense_buffer)(struct se_cmd *); 49 bool (*get_write_cache)(struct se_device *); 50 int (*init_prot)(struct se_device *); 51 int (*format_prot)(struct se_device *); 52 void (*free_prot)(struct se_device *); 53 54 struct configfs_attribute **tb_dev_attrib_attrs; 55 }; 56 57 struct sbc_ops { 58 sense_reason_t (*execute_rw)(struct se_cmd *cmd, struct scatterlist *, 59 u32, enum dma_data_direction); 60 sense_reason_t (*execute_sync_cache)(struct se_cmd *cmd); 61 sense_reason_t (*execute_write_same)(struct se_cmd *cmd); 62 sense_reason_t (*execute_unmap)(struct se_cmd *cmd, 63 sector_t lba, sector_t nolb); 64 }; 65 66 int transport_backend_register(const struct target_backend_ops *); 67 void target_backend_unregister(const struct target_backend_ops *); 68 69 void target_complete_cmd(struct se_cmd *, u8); 70 void target_complete_cmd_with_length(struct se_cmd *, u8, int); 71 72 void transport_copy_sense_to_cmd(struct se_cmd *, unsigned char *); 73 74 sense_reason_t spc_parse_cdb(struct se_cmd *cmd, unsigned int *size); 75 sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd); 76 sense_reason_t spc_emulate_inquiry_std(struct se_cmd *, unsigned char *); 77 sense_reason_t spc_emulate_evpd_83(struct se_cmd *, unsigned char *); 78 79 sense_reason_t sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops); 80 u32 sbc_get_device_rev(struct se_device *dev); 81 u32 sbc_get_device_type(struct se_device *dev); 82 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd); 83 void sbc_dif_generate(struct se_cmd *); 84 sense_reason_t sbc_dif_verify(struct se_cmd *, sector_t, unsigned int, 85 unsigned int, struct scatterlist *, int); 86 void sbc_dif_copy_prot(struct se_cmd *, unsigned int, bool, 87 struct scatterlist *, int); 88 void transport_set_vpd_proto_id(struct t10_vpd *, unsigned char *); 89 int transport_set_vpd_assoc(struct t10_vpd *, unsigned char *); 90 int transport_set_vpd_ident_type(struct t10_vpd *, unsigned char *); 91 int transport_set_vpd_ident(struct t10_vpd *, unsigned char *); 92 93 extern struct configfs_attribute *sbc_attrib_attrs[]; 94 extern struct configfs_attribute *passthrough_attrib_attrs[]; 95 96 /* core helpers also used by command snooping in pscsi */ 97 void *transport_kmap_data_sg(struct se_cmd *); 98 void transport_kunmap_data_sg(struct se_cmd *); 99 /* core helpers also used by xcopy during internal command setup */ 100 sense_reason_t transport_generic_map_mem_to_cmd(struct se_cmd *, 101 struct scatterlist *, u32, struct scatterlist *, u32); 102 103 bool target_lun_is_rdonly(struct se_cmd *); 104 sense_reason_t passthrough_parse_cdb(struct se_cmd *cmd, 105 sense_reason_t (*exec_cmd)(struct se_cmd *cmd)); 106 107 struct se_device *target_find_device(int id, bool do_depend); 108 109 bool target_sense_desc_format(struct se_device *dev); 110 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb); 111 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib, 112 struct request_queue *q); 113 114 115 /* Only use get_unaligned_be24() if reading p - 1 is allowed. */ 116 static inline uint32_t get_unaligned_be24(const uint8_t *const p) 117 { 118 return get_unaligned_be32(p - 1) & 0xffffffU; 119 } 120 121 #endif /* TARGET_CORE_BACKEND_H */ 122