7f7caf6aa7
In addition to block size (already implemented), passing through alignment offset, logical-to-phys block exponent, I/O granularity and optimal I/O length will allow initiators to properly handle layout on LUNs with 4K block sizes. Tested with various weird values via scsi_debug module. One thing to look at with this patch is the new block limits values -- instead of granularity 1 optimal 8192, Lio will now be returning whatever the block device says, which may affect performance. Signed-off-by: Andy Grover <agrover@redhat.com> Acked-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
90 lines
3.3 KiB
C
90 lines
3.3 KiB
C
#ifndef TARGET_CORE_BACKEND_H
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#define TARGET_CORE_BACKEND_H
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#define TRANSPORT_PLUGIN_PHBA_PDEV 1
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#define TRANSPORT_PLUGIN_VHBA_PDEV 2
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#define TRANSPORT_PLUGIN_VHBA_VDEV 3
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struct se_subsystem_api {
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struct list_head sub_api_list;
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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_type;
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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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};
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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_write_same_unmap)(struct se_cmd *cmd);
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sense_reason_t (*execute_unmap)(struct se_cmd *cmd);
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};
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int transport_subsystem_register(struct se_subsystem_api *);
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void transport_subsystem_release(struct se_subsystem_api *);
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void target_complete_cmd(struct se_cmd *, u8);
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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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sense_reason_t sbc_execute_unmap(struct se_cmd *cmd,
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sense_reason_t (*do_unmap_fn)(struct se_cmd *cmd, void *priv,
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sector_t lba, sector_t nolb),
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void *priv);
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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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/* 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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int target_alloc_sgl(struct scatterlist **, unsigned int *, u32, bool);
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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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void array_free(void *array, int n);
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#endif /* TARGET_CORE_BACKEND_H */
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