diff options
Diffstat (limited to 'include/target/target_core_backend.h')
| -rw-r--r-- | include/target/target_core_backend.h | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/include/target/target_core_backend.h b/include/target/target_core_backend.h new file mode 100644 index 000000000..0deeff9b4 --- /dev/null +++ b/include/target/target_core_backend.h @@ -0,0 +1,126 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef TARGET_CORE_BACKEND_H +#define TARGET_CORE_BACKEND_H + +#include <linux/types.h> +#include <asm/unaligned.h> +#include <target/target_core_base.h> + +#define TRANSPORT_FLAG_PASSTHROUGH 0x1 +/* + * ALUA commands, state checks and setup operations are handled by the + * backend module. + */ +#define TRANSPORT_FLAG_PASSTHROUGH_ALUA 0x2 +#define TRANSPORT_FLAG_PASSTHROUGH_PGR 0x4 + +struct request_queue; +struct scatterlist; + +struct target_backend_ops { + char name[16]; + char inquiry_prod[16]; + char inquiry_rev[4]; + struct module *owner; + + u8 transport_flags; + + int (*attach_hba)(struct se_hba *, u32); + void (*detach_hba)(struct se_hba *); + int (*pmode_enable_hba)(struct se_hba *, unsigned long); + + struct se_device *(*alloc_device)(struct se_hba *, const char *); + int (*configure_device)(struct se_device *); + void (*destroy_device)(struct se_device *); + void (*free_device)(struct se_device *device); + + ssize_t (*set_configfs_dev_params)(struct se_device *, + const char *, ssize_t); + ssize_t (*show_configfs_dev_params)(struct se_device *, char *); + + sense_reason_t (*parse_cdb)(struct se_cmd *cmd); + u32 (*get_device_type)(struct se_device *); + sector_t (*get_blocks)(struct se_device *); + sector_t (*get_alignment_offset_lbas)(struct se_device *); + /* lbppbe = logical blocks per physical block exponent. see SBC-3 */ + unsigned int (*get_lbppbe)(struct se_device *); + unsigned int (*get_io_min)(struct se_device *); + unsigned int (*get_io_opt)(struct se_device *); + unsigned char *(*get_sense_buffer)(struct se_cmd *); + bool (*get_write_cache)(struct se_device *); + int (*init_prot)(struct se_device *); + int (*format_prot)(struct se_device *); + void (*free_prot)(struct se_device *); + + struct configfs_attribute **tb_dev_attrib_attrs; + struct configfs_attribute **tb_dev_action_attrs; +}; + +struct sbc_ops { + sense_reason_t (*execute_rw)(struct se_cmd *cmd, struct scatterlist *, + u32, enum dma_data_direction); + sense_reason_t (*execute_sync_cache)(struct se_cmd *cmd); + sense_reason_t (*execute_write_same)(struct se_cmd *cmd); + sense_reason_t (*execute_unmap)(struct se_cmd *cmd, + sector_t lba, sector_t nolb); +}; + +int transport_backend_register(const struct target_backend_ops *); +void target_backend_unregister(const struct target_backend_ops *); + +void target_complete_cmd(struct se_cmd *, u8); +void target_set_cmd_data_length(struct se_cmd *, int); +void target_complete_cmd_with_length(struct se_cmd *, u8, int); + +void transport_copy_sense_to_cmd(struct se_cmd *, unsigned char *); + +sense_reason_t spc_parse_cdb(struct se_cmd *cmd, unsigned int *size); +sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd); +sense_reason_t spc_emulate_inquiry_std(struct se_cmd *, unsigned char *); +sense_reason_t spc_emulate_evpd_83(struct se_cmd *, unsigned char *); + +sense_reason_t sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops); +u32 sbc_get_device_rev(struct se_device *dev); +u32 sbc_get_device_type(struct se_device *dev); +sector_t sbc_get_write_same_sectors(struct se_cmd *cmd); +void sbc_dif_generate(struct se_cmd *); +sense_reason_t sbc_dif_verify(struct se_cmd *, sector_t, unsigned int, + unsigned int, struct scatterlist *, int); +void sbc_dif_copy_prot(struct se_cmd *, unsigned int, bool, + struct scatterlist *, int); +void transport_set_vpd_proto_id(struct t10_vpd *, unsigned char *); +int transport_set_vpd_assoc(struct t10_vpd *, unsigned char *); +int transport_set_vpd_ident_type(struct t10_vpd *, unsigned char *); +int transport_set_vpd_ident(struct t10_vpd *, unsigned char *); + +extern struct configfs_attribute *sbc_attrib_attrs[]; +extern struct configfs_attribute *passthrough_attrib_attrs[]; + +/* core helpers also used by command snooping in pscsi */ +void *transport_kmap_data_sg(struct se_cmd *); +void transport_kunmap_data_sg(struct se_cmd *); +/* core helpers also used by xcopy during internal command setup */ +sense_reason_t transport_generic_map_mem_to_cmd(struct se_cmd *, + struct scatterlist *, u32, struct scatterlist *, u32); + +bool target_lun_is_rdonly(struct se_cmd *); +sense_reason_t passthrough_parse_cdb(struct se_cmd *cmd, + sense_reason_t (*exec_cmd)(struct se_cmd *cmd)); + +bool target_sense_desc_format(struct se_device *dev); +sector_t target_to_linux_sector(struct se_device *dev, sector_t lb); +bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib, + struct request_queue *q); + +static inline bool target_dev_configured(struct se_device *se_dev) +{ + return !!(se_dev->dev_flags & DF_CONFIGURED); +} + +/* Only use get_unaligned_be24() if reading p - 1 is allowed. */ +static inline uint32_t get_unaligned_be24(const uint8_t *const p) +{ + return get_unaligned_be32(p - 1) & 0xffffffU; +} + +#endif /* TARGET_CORE_BACKEND_H */ |