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target_core_backend.h
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target_core_backend.h
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/* 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_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 */