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The SRP target driver will need to allocate and chain it's own SGLs soon. For this export target_alloc_sgl, and add a new argument to it so that it can allocate an additional chain entry that doesn't point to a page. Also export transport_free_sgl after renaming it to target_free_sgl to free these SGLs again. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
101 lines
3.9 KiB
C
101 lines
3.9 KiB
C
#ifndef TARGET_CORE_BACKEND_H
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#define TARGET_CORE_BACKEND_H
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#define TRANSPORT_FLAG_PASSTHROUGH 1
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struct target_backend_ops {
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char name[16];
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char inquiry_prod[16];
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char inquiry_rev[4];
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struct module *owner;
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u8 transport_flags;
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int (*attach_hba)(struct se_hba *, u32);
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void (*detach_hba)(struct se_hba *);
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int (*pmode_enable_hba)(struct se_hba *, unsigned long);
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struct se_device *(*alloc_device)(struct se_hba *, const char *);
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int (*configure_device)(struct se_device *);
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void (*free_device)(struct se_device *device);
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ssize_t (*set_configfs_dev_params)(struct se_device *,
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const char *, ssize_t);
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ssize_t (*show_configfs_dev_params)(struct se_device *, char *);
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void (*transport_complete)(struct se_cmd *cmd,
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struct scatterlist *,
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unsigned char *);
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sense_reason_t (*parse_cdb)(struct se_cmd *cmd);
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u32 (*get_device_type)(struct se_device *);
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sector_t (*get_blocks)(struct se_device *);
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sector_t (*get_alignment_offset_lbas)(struct se_device *);
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/* lbppbe = logical blocks per physical block exponent. see SBC-3 */
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unsigned int (*get_lbppbe)(struct se_device *);
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unsigned int (*get_io_min)(struct se_device *);
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unsigned int (*get_io_opt)(struct se_device *);
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unsigned char *(*get_sense_buffer)(struct se_cmd *);
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bool (*get_write_cache)(struct se_device *);
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int (*init_prot)(struct se_device *);
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int (*format_prot)(struct se_device *);
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void (*free_prot)(struct se_device *);
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struct configfs_attribute **tb_dev_attrib_attrs;
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};
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struct sbc_ops {
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sense_reason_t (*execute_rw)(struct se_cmd *cmd, struct scatterlist *,
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u32, enum dma_data_direction);
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sense_reason_t (*execute_sync_cache)(struct se_cmd *cmd);
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sense_reason_t (*execute_write_same)(struct se_cmd *cmd);
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sense_reason_t (*execute_unmap)(struct se_cmd *cmd,
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sector_t lba, sector_t nolb);
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};
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int transport_backend_register(const struct target_backend_ops *);
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void target_backend_unregister(const struct target_backend_ops *);
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void target_complete_cmd(struct se_cmd *, u8);
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void target_complete_cmd_with_length(struct se_cmd *, u8, int);
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sense_reason_t spc_parse_cdb(struct se_cmd *cmd, unsigned int *size);
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sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd);
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sense_reason_t spc_emulate_inquiry_std(struct se_cmd *, unsigned char *);
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sense_reason_t spc_emulate_evpd_83(struct se_cmd *, unsigned char *);
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sense_reason_t sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops);
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u32 sbc_get_device_rev(struct se_device *dev);
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u32 sbc_get_device_type(struct se_device *dev);
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sector_t sbc_get_write_same_sectors(struct se_cmd *cmd);
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void sbc_dif_generate(struct se_cmd *);
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sense_reason_t sbc_dif_verify(struct se_cmd *, sector_t, unsigned int,
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unsigned int, struct scatterlist *, int);
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void sbc_dif_copy_prot(struct se_cmd *, unsigned int, bool,
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struct scatterlist *, int);
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void transport_set_vpd_proto_id(struct t10_vpd *, unsigned char *);
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int transport_set_vpd_assoc(struct t10_vpd *, unsigned char *);
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int transport_set_vpd_ident_type(struct t10_vpd *, unsigned char *);
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int transport_set_vpd_ident(struct t10_vpd *, unsigned char *);
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extern struct configfs_attribute *sbc_attrib_attrs[];
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extern struct configfs_attribute *passthrough_attrib_attrs[];
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/* core helpers also used by command snooping in pscsi */
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void *transport_kmap_data_sg(struct se_cmd *);
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void transport_kunmap_data_sg(struct se_cmd *);
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/* core helpers also used by xcopy during internal command setup */
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sense_reason_t transport_generic_map_mem_to_cmd(struct se_cmd *,
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struct scatterlist *, u32, struct scatterlist *, u32);
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bool target_lun_is_rdonly(struct se_cmd *);
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sense_reason_t passthrough_parse_cdb(struct se_cmd *cmd,
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sense_reason_t (*exec_cmd)(struct se_cmd *cmd));
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bool target_sense_desc_format(struct se_device *dev);
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sector_t target_to_linux_sector(struct se_device *dev, sector_t lb);
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bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
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struct request_queue *q, int block_size);
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#endif /* TARGET_CORE_BACKEND_H */
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