aa12cea2cc
Although groff_mdoc(7) gives another impression, this is the ordering most widely used and also required by mdocml/mandoc. Reviewed by: ru Approved by: philip, ed (mentors)
569 lines
17 KiB
Groff
569 lines
17 KiB
Groff
.\"
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.\" Copyright (c) 1998 Kenneth D. Merry.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.\" This man page borrows heavily from the old scsi(3) man page, which had
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.\" the following copyright:
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.\"
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.\" Copyright (c) 1994 HD Associates (hd@world.std.com)
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
|
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.\" 2. Redistributions in binary form must reproduce the above copyright
|
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.\" notice, this list of conditions and the following disclaimer in the
|
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by HD Associates
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.\" 4. Neither the name of the HD Associates nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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.\" SUCH DAMAGE.
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.\"
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.\"
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.Dd October 13, 1998
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.Dt CAM_CDBPARSE 3
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.Os
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.Sh NAME
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.Nm csio_build ,
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.Nm csio_build_visit ,
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.Nm csio_decode ,
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.Nm csio_decode_visit ,
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.Nm buff_decode ,
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.Nm buff_decode_visit ,
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.Nm csio_encode ,
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.Nm csio_encode_visit ,
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.Nm buff_encode_visit
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.Nd CAM user library SCSI buffer parsing routines
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.Sh LIBRARY
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.Lb libcam
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.Sh SYNOPSIS
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|
.In stdio.h
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.In camlib.h
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|
.Ft int
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|
.Fo csio_build
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|
.Fa "struct ccb_scsiio *csio"
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|
.Fa "u_int8_t *data_ptr"
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.Fa "u_int32_t dxfer_len"
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.Fa "u_int32_t flags"
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.Fa "int retry_count"
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|
.Fa "int timeout"
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.Fa "const char *cmd_spec"
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|
.Fa "..."
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|
.Fc
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|
.Ft int
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|
.Fo csio_build_visit
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|
.Fa "struct ccb_scsiio *csio"
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.Fa "u_int8_t *data_ptr"
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.Fa "u_int32_t dxfer_len"
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.Fa "u_int32_t flags"
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.Fa "int retry_count"
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.Fa "int timeout"
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.Fa "const char *cmd_spec"
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.Fa "int (*arg_get)(void *hook, char *field_name)"
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.Fa "void *gethook"
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.Fc
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.Ft int
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.Fo csio_decode
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.Fa "struct ccb_scsiio *csio"
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.Fa "const char *fmt"
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.Fa "..."
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.Fc
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.Ft int
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.Fo csio_decode_visit
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.Fa "struct ccb_scsiio *csio"
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.Fa "const char *fmt"
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.Fa "void (*arg_put)(void *hook"
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|
.Fa "int letter"
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.Fa "void *val"
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.Fa "int count"
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.Fa "char *name)"
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.Fa "void *puthook"
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.Fc
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.Ft int
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.Fo buff_decode
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.Fa "u_int8_t *buff"
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.Fa "size_t len"
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.Fa "const char *fmt"
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.Fa "..."
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.Fc
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.Ft int
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.Fo buff_decode_visit
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.Fa "u_int8_t *buff"
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.Fa "size_t len"
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.Fa "const char *fmt"
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.Fa "void (*arg_put)(void *, int, void *, int, char *)"
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.Fa "void *puthook"
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.Fc
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.Ft int
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.Fo csio_encode
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.Fa "struct ccb_scsiio *csio"
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.Fa "const char *fmt"
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.Fa "..."
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.Fc
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.Ft int
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.Fo csio_encode_visit
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.Fa "struct ccb_scsiio *csio"
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.Fa "const char *fmt"
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.Fa "int (*arg_get)(void *hook, char *field_name)"
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.Fa "void *gethook"
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.Fc
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.Ft int
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.Fo buff_encode_visit
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.Fa "u_int8_t *buff"
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.Fa "size_t len"
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.Fa "const char *fmt"
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.Fa "int (*arg_get)(void *hook, char *field_name)"
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.Fa "void *gethook"
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.Fc
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.Sh DESCRIPTION
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The CAM buffer/CDB encoding and decoding routines provide a relatively easy
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|
migration path for userland
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.Tn SCSI
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|
applications written with the similarly-named
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.Va scsireq_ Ns *
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|
functions from the old
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.Fx
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.Tn SCSI
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layer.
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|
.Pp
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|
These functions may be used in new applications, but users may find it
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easier to use the various SCSI CCB building functions included with the
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.Xr cam 3
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library.
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(e.g.\&
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.Fn cam_fill_csio ,
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.Fn scsi_start_stop ,
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and
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.Fn scsi_read_write )
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.Pp
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.Fn csio_build
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builds up a
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.Va ccb_scsiio
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structure based on the information provided in
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the variable argument list.
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It gracefully handles a NULL
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.Fa data_ptr
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argument passed to it.
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.Pp
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.Fa dxfer_len
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|
is the length of the data phase; the data transfer direction is
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determined by the
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.Fa flags
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argument.
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.Pp
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.Fa data_ptr
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|
is the data buffer used during the
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.Tn SCSI
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|
data phase.
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|
If no data is to be
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|
transferred for the
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|
.Tn SCSI
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|
command in question, this should be set to NULL.
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|
If there is data to
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transfer for the command, this buffer must be at least
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.Fa dxfer_len
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long.
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|
.Pp
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.Fa flags
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are the flags defined in
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.In cam/cam_ccb.h :
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.Bd -literal
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/* Common CCB header */
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/* CAM CCB flags */
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typedef enum {
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CAM_CDB_POINTER = 0x00000001,/* The CDB field is a pointer */
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CAM_QUEUE_ENABLE = 0x00000002,/* SIM queue actions are enabled */
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CAM_CDB_LINKED = 0x00000004,/* CCB contains a linked CDB */
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CAM_SCATTER_VALID = 0x00000010,/* Scatter/gather list is valid */
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CAM_DIS_AUTOSENSE = 0x00000020,/* Disable autosense feature */
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CAM_DIR_RESV = 0x00000000,/* Data direction (00:reserved) */
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CAM_DIR_IN = 0x00000040,/* Data direction (01:DATA IN) */
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CAM_DIR_OUT = 0x00000080,/* Data direction (10:DATA OUT) */
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CAM_DIR_NONE = 0x000000C0,/* Data direction (11:no data) */
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CAM_DIR_MASK = 0x000000C0,/* Data direction Mask */
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CAM_SOFT_RST_OP = 0x00000100,/* Use Soft reset alternative */
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CAM_ENG_SYNC = 0x00000200,/* Flush resid bytes on complete */
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CAM_DEV_QFRZDIS = 0x00000400,/* Disable DEV Q freezing */
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CAM_DEV_QFREEZE = 0x00000800,/* Freeze DEV Q on execution */
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CAM_HIGH_POWER = 0x00001000,/* Command takes a lot of power */
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CAM_SENSE_PTR = 0x00002000,/* Sense data is a pointer */
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CAM_SENSE_PHYS = 0x00004000,/* Sense pointer is physical addr*/
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CAM_TAG_ACTION_VALID = 0x00008000,/* Use the tag action in this ccb*/
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CAM_PASS_ERR_RECOVER = 0x00010000,/* Pass driver does err. recovery*/
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CAM_DIS_DISCONNECT = 0x00020000,/* Disable disconnect */
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CAM_SG_LIST_PHYS = 0x00040000,/* SG list has physical addrs. */
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CAM_MSG_BUF_PHYS = 0x00080000,/* Message buffer ptr is physical*/
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CAM_SNS_BUF_PHYS = 0x00100000,/* Autosense data ptr is physical*/
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CAM_DATA_PHYS = 0x00200000,/* SG/Buffer data ptrs are phys. */
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CAM_CDB_PHYS = 0x00400000,/* CDB pointer is physical */
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CAM_ENG_SGLIST = 0x00800000,/* SG list is for the HBA engine */
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/* Phase cognizant mode flags */
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CAM_DIS_AUTOSRP = 0x01000000,/* Disable autosave/restore ptrs */
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CAM_DIS_AUTODISC = 0x02000000,/* Disable auto disconnect */
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CAM_TGT_CCB_AVAIL = 0x04000000,/* Target CCB available */
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CAM_TGT_PHASE_MODE = 0x08000000,/* The SIM runs in phase mode */
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CAM_MSGB_VALID = 0x20000000,/* Message buffer valid */
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|
CAM_STATUS_VALID = 0x40000000,/* Status buffer valid */
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CAM_DATAB_VALID = 0x80000000,/* Data buffer valid */
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|
|
|
/* Host target Mode flags */
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CAM_TERM_IO = 0x20000000,/* Terminate I/O Message sup. */
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|
CAM_DISCONNECT = 0x40000000,/* Disconnects are mandatory */
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CAM_SEND_STATUS = 0x80000000,/* Send status after data phase */
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} ccb_flags;
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.Ed
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.Pp
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|
Multiple flags should be ORed together.
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Any of the CCB flags may be used,
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although it is worth noting several important ones here:
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.Pp
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.Bl -tag -width CAM_PASS_ERR_RECOVER
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.It Dv CAM_DIR_IN
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|
This indicates that the operation in question is a read operation.
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|
i.e.,
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data is being read from the
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.Tn SCSI
|
|
device to the user-supplied buffer.
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|
.It Dv CAM_DIR_OUT
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|
This indicates that the operation is a write operation.
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|
i.e., data is being
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written from the user-supplied buffer to the device.
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.It Dv CAM_DIR_NONE
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|
This indicates that there is no data to be transferred for this command.
|
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.It Dv CAM_DEV_QFRZDIS
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|
This flag disables device queue freezing as an error recovery mechanism.
|
|
.It Dv CAM_PASS_ERR_RECOVER
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|
This flag tells the
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|
.Xr pass 4
|
|
driver to enable error recovery.
|
|
The default is to not perform error
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|
recovery, which means that the retry count will not be honored without this
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|
flag, among other things.
|
|
.It Dv CAM_DATA_PHYS
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|
This indicates that the address contained in
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.Fa data_ptr
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|
is a physical address, not a virtual address.
|
|
.El
|
|
.Pp
|
|
The
|
|
.Fa retry_count
|
|
tells the kernel how many times to retry the command in question.
|
|
The
|
|
retry count is ignored unless the
|
|
.Xr pass 4
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|
driver is told to enable error recovery via the
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.Dv CAM_PASS_ERR_RECOVER
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flag.
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.Pp
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The
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.Fa timeout
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tells the kernel how long to wait for the given command to complete.
|
|
If
|
|
the timeout expires and the command has not completed, the CCB will be
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returned from the kernel with an appropriate error status.
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|
.Pp
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.Fa cmd_spec
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|
is a CDB format specifier used to build up the SCSI CDB.
|
|
This text string is made up of a list of field specifiers.
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|
Field
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specifiers specify the value for each CDB field (including indicating
|
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that the value be taken from the next argument in the
|
|
variable argument list), the width
|
|
of the field in bits or bytes, and an optional name.
|
|
White space is
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|
ignored, and the pound sign ('#') introduces a comment that ends at the
|
|
end of the current line.
|
|
.Pp
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|
The optional name is the first part of a field specifier and
|
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is in curly braces.
|
|
The text in curly braces in this example are
|
|
the names:
|
|
.Dl "{PS} v:b1 {Reserved} 0:b1 {Page Code} v:b6 # Mode select page"
|
|
.Pp
|
|
This field specifier has two one bit fields and one six bit field.
|
|
The second one bit field is the constant value 0 and the first
|
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one bit field and the six bit field are taken from the variable
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argument list.
|
|
Multi byte fields are swapped into the SCSI byte order in the
|
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CDB and white space is ignored.
|
|
.Pp
|
|
When the field is a hex value or the letter v, (e.g.,
|
|
.Fa "1A"
|
|
or
|
|
.Fa "v" )
|
|
then a single byte value
|
|
is copied to the next unused byte of the CDB.
|
|
When the letter
|
|
.Fa v
|
|
is used the next integer argument is taken from the variable argument list
|
|
and that value used.
|
|
.Pp
|
|
A constant hex value followed by a field width specifier or the letter
|
|
.Fa v
|
|
followed by a field width specifier (e.g.,
|
|
.Fa 3:4 ,
|
|
.Fa 3:b4 ,
|
|
.Fa 3:i3 ,
|
|
.Fa v:i3 )
|
|
specifies a field of a given bit or byte width.
|
|
Either the constant value or (for the V specifier) the next integer value from
|
|
the variable argument list is copied to the next unused
|
|
bits or bytes of the CDB.
|
|
.Pp
|
|
A decimal number or the letter
|
|
.Fa b
|
|
followed by a decimal number field width indicates a bit field of that width.
|
|
The bit fields are packed as tightly as possible beginning with the
|
|
high bit (so that it reads the same as the SCSI spec), and a new byte of
|
|
the CDB is started whenever a byte fills completely or when an
|
|
.Fa i
|
|
field is encountered.
|
|
.Pp
|
|
A field width specifier consisting of the letter
|
|
.Fa i
|
|
followed by either
|
|
1, 2, 3 or 4 indicates a 1, 2, 3 or 4 byte integral value that must
|
|
be swapped into SCSI byte order (MSB first).
|
|
.Pp
|
|
For the
|
|
.Fa v
|
|
field specifier the next integer argument is taken from the variable argument
|
|
list and that value is used swapped into SCSI byte order.
|
|
.Pp
|
|
.Fn csio_build_visit
|
|
operates similarly to
|
|
.Fn csio_build ,
|
|
except that the values to substitute for variable arguments in
|
|
.Fa cmd_spec
|
|
are retrieved via the
|
|
.Fn arg_get
|
|
function passed in to
|
|
.Fn csio_build_visit
|
|
instead of via
|
|
.Xr stdarg 3 .
|
|
The
|
|
.Fn arg_get
|
|
function takes two arguments:
|
|
.Bl -tag -width field_name
|
|
.It Fa gethook
|
|
is passed into the
|
|
.Fn arg_get
|
|
function at each invocation.
|
|
This enables the
|
|
.Fn arg_get
|
|
function to keep some state in between calls without using global or static
|
|
variables.
|
|
.It Fa field_name
|
|
is the field name supplied in
|
|
.Fa fmt ,
|
|
if any.
|
|
.El
|
|
.Pp
|
|
.Fn csio_decode
|
|
is used to decode information from the data in phase of the SCSI
|
|
transfer.
|
|
.Pp
|
|
The decoding is similar to
|
|
the command specifier processing of
|
|
.Fn csio_build
|
|
except that the data is extracted from the data pointed to by
|
|
.Fa csio->data_ptr .
|
|
The stdarg list should be pointers to integers instead of integer
|
|
values.
|
|
A seek field type and a suppression modifier are added.
|
|
The
|
|
.Fa *
|
|
suppression modifier (e.g.,
|
|
.Fa *i3
|
|
or
|
|
.Fa *b4 )
|
|
suppresses assignment from the field and can be used to skip
|
|
over bytes or bits in the data, without having to copy
|
|
them to a dummy variable in the arg list.
|
|
.Pp
|
|
The seek field type
|
|
.Fa s
|
|
permits you to skip over data.
|
|
This seeks to an absolute position
|
|
.Pq Fa s3
|
|
or a relative position
|
|
.Pq Fa s+3
|
|
in the data, based on whether or not the presence of the '+' sign.
|
|
The seek value can be specified as
|
|
.Fa v
|
|
and the next integer value from the argument list will be
|
|
used as the seek value.
|
|
.Pp
|
|
.Fn csio_decode_visit
|
|
operates like
|
|
.Fn csio_decode
|
|
except that instead of placing the decoded contents of the buffer in
|
|
variadic arguments, the decoded buffer contents are returned to the user
|
|
via the
|
|
.Fn arg_put
|
|
function that is passed in.
|
|
The
|
|
.Fn arg_put
|
|
function takes several arguments:
|
|
.Bl -tag -width letter
|
|
.It Fa hook
|
|
The "hook" is a mechanism to allow the
|
|
.Fn arg_put
|
|
function to save state in between calls.
|
|
.It Fa letter
|
|
is the letter describing the format of the argument being passed into the
|
|
function.
|
|
.It Fa val
|
|
is a void pointer to the value being passed into the function.
|
|
.It Fa count
|
|
is the size of the value being passed into the
|
|
.Fn arg_put
|
|
function.
|
|
The argument format determines the unit of measure.
|
|
.It Fa name
|
|
This is a text description of the field, if one was provided in the
|
|
.Fa fmt .
|
|
.El
|
|
.Pp
|
|
.Fn buff_decode
|
|
decodes an arbitrary data buffer using the method
|
|
described above for
|
|
.Fn csio_decode .
|
|
.Pp
|
|
.Fn buff_decode_visit
|
|
decodes an arbitrary data buffer using the method described above for
|
|
.Fn csio_decode_visit .
|
|
.Pp
|
|
.Fn csio_encode
|
|
encodes the
|
|
.Fa data_ptr
|
|
portion (not the CDB!) of a
|
|
.Va ccb_scsiio
|
|
structure, using the method described above for
|
|
.Fn csio_build .
|
|
.Pp
|
|
.Fn csio_encode_visit
|
|
encodes the
|
|
.Fa data_ptr
|
|
portion (not the CDB!) of a
|
|
.Va ccb_scsiio
|
|
structure, using the method described above for
|
|
.Fn csio_build_visit .
|
|
.Pp
|
|
.Fn buff_encode_visit
|
|
encodes an arbitrary data pointer, using the method described
|
|
above for
|
|
.Fn csio_build_visit .
|
|
.Sh RETURN VALUES
|
|
.Fn csio_build ,
|
|
.Fn csio_build_visit ,
|
|
.Fn csio_encode ,
|
|
.Fn csio_encode_visit ,
|
|
and
|
|
.Fn buff_encode_visit
|
|
return the number of fields processed.
|
|
.Pp
|
|
.Fn csio_decode ,
|
|
.Fn csio_decode_visit ,
|
|
.Fn buff_decode ,
|
|
and
|
|
.Fn buff_decode_visit
|
|
return the number of assignments performed.
|
|
.Sh SEE ALSO
|
|
.Xr cam 3 ,
|
|
.Xr pass 4 ,
|
|
.Xr camcontrol 8
|
|
.Sh HISTORY
|
|
The CAM versions of these functions are based upon similar functions
|
|
implemented for the old
|
|
.Fx
|
|
.Tn SCSI
|
|
layer.
|
|
The encoding/decoding functions in the old
|
|
.Tn SCSI
|
|
code were written by Peter Dufault.
|
|
.Pp
|
|
Many systems have comparable interfaces to permit a user to construct a
|
|
SCSI command in user space.
|
|
.Pp
|
|
The old
|
|
.Va scsireq
|
|
data structure was almost identical to the SGI /dev/scsi data
|
|
structure.
|
|
If anyone knows the name of the authors it should
|
|
go here; Peter Dufault first read about it in a 1989 Sun Expert magazine.
|
|
.Pp
|
|
The new CCB data structures are derived from the CAM-2 and CAM-3
|
|
specifications.
|
|
.Pp
|
|
.An Peter Dufault
|
|
implemented a clone of SGI's interface in
|
|
.Bx 386
|
|
that
|
|
led to the original
|
|
.Fx
|
|
.Tn SCSI
|
|
library and the related kernel ioctl.
|
|
If anyone needs that for compatibility contact dufault@hda.com.
|
|
.Sh AUTHORS
|
|
Kenneth Merry implemented the CAM versions of these encoding and decoding
|
|
functions.
|
|
This current work is based upon earlier work by Peter Dufault.
|
|
.Sh BUGS
|
|
There should probably be a function that encodes both the CDB and the data
|
|
buffer portions of a
|
|
.Tn SCSI
|
|
CCB.
|
|
I discovered this while implementing the arbitrary command execution
|
|
code in
|
|
.Xr camcontrol 8 ,
|
|
but I have not yet had time to implement such a function.
|
|
.Pp
|
|
Some of the CCB flag descriptions really do not belong here.
|
|
Rather they
|
|
belong in a generic CCB man page.
|
|
Since that man page has not yet been
|
|
written, the shorter descriptions here will have to suffice.
|