/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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#ifndef BSG_H

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#define BSG_H

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#include <linux/types.h>

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#define BSG_PROTOCOL_SCSI 0

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#define BSG_SUB_PROTOCOL_SCSI_CMD 0

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#define BSG_SUB_PROTOCOL_SCSI_TMF 1

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#define BSG_SUB_PROTOCOL_SCSI_TRANSPORT 2

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/*

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* For flag constants below:

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* sg.h sg_io_hdr also has bits defined for it's flags member. These

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* two flag values (0x10 and 0x20) have the same meaning in sg.h . For

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* bsg the BSG_FLAG_Q_AT_HEAD flag is ignored since it is the deafult.

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*/

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#define BSG_FLAG_Q_AT_TAIL 0x10 /* default is Q_AT_HEAD */

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#define BSG_FLAG_Q_AT_HEAD 0x20

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struct sg_io_v4 {

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__s32 guard; /* [i] 'Q' to differentiate from v3 */

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__u32 protocol; /* [i] 0 -> SCSI , .... */

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__u32 subprotocol; /* [i] 0 -> SCSI command, 1 -> SCSI task

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management function, .... */

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__u32 request_len; /* [i] in bytes */

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__u64 request; /* [i], [*i] {SCSI: cdb} */

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__u64 request_tag; /* [i] {SCSI: task tag (only if flagged)} */

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__u32 request_attr; /* [i] {SCSI: task attribute} */

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__u32 request_priority; /* [i] {SCSI: task priority} */

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__u32 request_extra; /* [i] {spare, for padding} */

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__u32 max_response_len; /* [i] in bytes */

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__u64 response; /* [i], [*o] {SCSI: (auto)sense data} */

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/* "dout_": data out (to device); "din_": data in (from device) */

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__u32 dout_iovec_count; /* [i] 0 -> "flat" dout transfer else

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dout_xfer points to array of iovec */

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__u32 dout_xfer_len; /* [i] bytes to be transferred to device */

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__u32 din_iovec_count; /* [i] 0 -> "flat" din transfer */

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__u32 din_xfer_len; /* [i] bytes to be transferred from device */

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__u64 dout_xferp; /* [i], [*i] */

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__u64 din_xferp; /* [i], [*o] */

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__u32 timeout; /* [i] units: millisecond */

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__u32 flags; /* [i] bit mask */

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__u64 usr_ptr; /* [i->o] unused internally */

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__u32 spare_in; /* [i] */

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__u32 driver_status; /* [o] 0 -> ok */

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__u32 transport_status; /* [o] 0 -> ok */

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__u32 device_status; /* [o] {SCSI: command completion status} */

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__u32 retry_delay; /* [o] {SCSI: status auxiliary information} */

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__u32 info; /* [o] additional information */

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__u32 duration; /* [o] time to complete, in milliseconds */

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__u32 response_len; /* [o] bytes of response actually written */

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__s32 din_resid; /* [o] din_xfer_len - actual_din_xfer_len */

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__s32 dout_resid; /* [o] dout_xfer_len - actual_dout_xfer_len */

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__u64 generated_tag; /* [o] {SCSI: transport generated task tag} */

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__u32 spare_out; /* [o] */

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__u32 padding;

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};

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#endif /* BSG_H */

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