VSCSI(4) | Device Drivers Manual | VSCSI(4) |
vscsi
— virtual
SCSI controller
vscsi0 at root
#include <sys/types.h>
#include <sys/ioctl.h>
#include <scsi/scsi_all.h>
#include <dev/vscsivar.h>
The vscsi
device takes commands from the
kernel SCSI midlayer and makes them available to userland for handling.
Using this interface it is possible to implement virtual SCSI devices that
are usable by the kernel.
The following ioctl(2) commands are provided to allow userland to dequeue SCSI commands and reply to them:
VSCSI_I2T
struct vscsi_ioc_i2t *EAGAIN
.
When one or more SCSI commands are available to dequeue, select(2) will indicate the descriptor as ready to read.
struct vscsi_ioc_i2t { int tag; u_int target; u_int lun; struct scsi_generic cmd; size_t cmdlen; size_t datalen; int direction; #define VSCSI_DIR_NONE 0 #define VSCSI_DIR_READ 1 #define VSCSI_DIR_WRITE 2 };
VSCSI_DATA_READ
struct vscsi_ioc_data *VSCSI_DATA_WRITE
struct vscsi_ioc_data *struct vscsi_ioc_data { int tag; void * data; size_t datalen; };
VSCSI_T2I
struct vscsi_ioc_t2i *struct vscsi_ioc_t2i { int tag; int status; #define VSCSI_STAT_DONE 0 #define VSCSI_STAT_SENSE 1 #define VSCSI_STAT_RESET 2 #define VSCSI_STAT_ERR 3 struct scsi_sense_data sense; };
VSCSI_REQPROBE
struct vscsi_ioc_devevent *VSCSI_REQDETACH
struct vscsi_ioc_devevent *struct vscsi_ioc_devevent { u_int target; u_int lun; };
The vscsi
driver first appeared in
OpenBSD 4.5.
David Gwynne <dlg@openbsd.org>.
September 12, 2017 | OpenBSD-6.2 |