include/target/target_core_backend.h

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