NAME

vioscsi — virtio SCSI driver

DESCRIPTION

The vioscsi driver provides a virtual SCSI transport, allowing access to virtio(4D) based SCSI targets and logical units. The driver supports the following capabilities:

• Dynamic hot-plug (if supported by the host)
• Honors packet timeouts specified in scsi_pkt(9S)
• Reset of target or logical unit via scsi_reset(9F)
• Abort for individual commands via scsi_abort(9F)
• Command queueing (both tagged and untagged)
• Honors per logical unit queue depth from device
• Up to 255 targets, and 16384 logical units per PCI function

The vioscsi driver is based on iport(9), and uses a single iport per PCI function, with a unit-address of "iport0". Children of the iport use a unit-address with the format "target,lun", where both target and lun are presented as hexadecimal values.

NOTES

The vioscsi driver may be slightly less efficient than vioblk(4D), but it may support use as boot media, as well as attachments to SCSI pass-through devices, which may include devices such as tape drives via st(4D) and enclosures via ses(4D).

ARCHITECTURE

The vioscsi driver is only supported on x86.

FILES

/kernel/drv/amd64/vioscsi

x86 device driver.

SEE ALSO

sd(4D), ses(4D), st(4D), vioblk(4D), virtio(4D), iport(9), scsi_abort(9F), scsi_reset(9F), scsi_pkt(9S)

Virtual I/O Device (VIRTIO) Version 1.1, https://docs.oasis-open.org/virtio/virtio/v1.1/virtio-v1.1.html, April, 2019.