bhyve: introduce cancel interface for usb device

[aokblast]

Summary

When disabling a port, xHCI should allow the backend a chance to cancel
all active transfers before deallocating memory. To support this, we
introduce an interface in UE that lets the backend register a
cancellation callback.

Additionally, this commit allows the backend to populate the tr_softc
field when setting up a transfer in ue_data, enabling context-specific
handling for transfer cancellation and cleanup.

Sponsored By: The FreeBSD Foundation

[aokblast]

Minor fixes

[markj]

You don't need to call ue_cancel in pci_xhci_cmd_reset_ep()?

[aokblast]

Add missing ue_cancel

[aokblast]

usr.sbin/bhyve/pci_xhci.c

1201

The rest ep only stop the xfer. However, the parameter of ue_reset pass a whole device instead of a xfer.

1201

Sorry, only clear the stall bit instead of stop whole transfer.

[markj]

usr.sbin/bhyve/pci_xhci.c

1205

We definitely don't need to be able to return an error from ue_cancel?

[aokblast]

Use int

[aokblast]

Formatting

[markj]

usr.sbin/bhyve/pci_xhci.c

738

Or print a warning if it fails.

1203

[aokblast]

Use (void)

[aokblast]

Destroy mutex

[aokblast]

No clear in reset

[markj]

usr.sbin/bhyve/pci_xhci.c

704

If you move the mutex_destroy to pci_xhci_disable_ep() (which also handles freeing the xfer), you can use this subroutine in pci_xhci_reset_slot() as well.

1206