ng_ubt(4): Introduce net.bluetooth.usb_isoc_enable loader tunable to disable
isochronous transfers.

If users want to disable isochronous transfers, which cause high
frequency periodic interrupts fro

ng_ubt(4): Introduce net.bluetooth.usb_isoc_enable loader tunable to disable
isochronous transfers.

If users want to disable isochronous transfers, which cause high
frequency periodic interrupts from the USB host controller, then
net.bluetooth.usb_isoc_enable can be set to zero, either as a
sysctl(8) or as a loader.conf(5) tunable.

Differential Revision: https://reviews.freebsd.org/D33282
Submitted by: [email protected]
PR: 238235
Sponsored by: NVIDIA Networking

(cherry picked from commit 67cbbf19595da4565d3c8603030fdb8d33ed571e)
(cherry picked from commit 03f0393477db4c11f8dc4166fadc2628b2c15ae9)
(cherry picked from commit 8fa952937bbe44a0fdd17348adfbbfd44aef6004)

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ng_ubt: Avoid attaching to several newer Intel controllers

Like other Intel controllers, these require firmware to be loaded, and
generic ng_ubt attach causes them to lock up until a power cycle.
Ho

ng_ubt: Avoid attaching to several newer Intel controllers

Like other Intel controllers, these require firmware to be loaded, and
generic ng_ubt attach causes them to lock up until a power cycle.
However, their firmware interface for querying version info and loading
operational firmware is different from that implemented by ng_ubt_intel
and iwmbtfw, so they are not usable yet. Just disable attach for now to
avoid stalls during USB device enumeration.

PR: 260161
Sponsored by: The FreeBSD Foundation

(cherry picked from commit b25ba58adc04ca475df1e8125d2a16a07d68b49d)

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