Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Bind CQ interrupts and tasks to separate CPUs in VNIC

Delegate interrupts and completion tasks on separate CPUs
for each VNIC.

Reviewed by: wma
Obtained from: Semihalf
Sponsored by: Cavium
Differential Revision: https://reviews.freebsd.org/D6229

Improve TX path of the VNIC driver

- Avoid memory leak when nicvf_tx_mbuf_locked() fails
- Introduce nicvf_xmit_locked() routine that uses drbr_peek(),
drbr_advance() or drbr_putback() for a specific ifnet.
This gives more clear and efficient design as well as
prevents from dropping mbufs that where not sent due to temporary
lack of descriptors.
- Add missing ETHER_BPF_MTAP() hook

Pointed out by: yongari
Reviewed by: wma
Obtained from: Semihalf
Sponsored by: Cavium
Differential Revision: https://reviews.freebsd.org/D5534

Introduce HW TSO support for VNIC

This feature was added in Pass2.0.
Significantly improves VNIC's TCP performance on Tx.

Reviewed by: wma
Obtained from: Semihalf
Sponsored by: Cavium
Differential Revision: https://reviews.freebsd.org/D5424

Enable CQ count threshold interrupt on VNIC Pass2.0

On Pass2.0 can trigger interrupt on both timer and CQ count.

Reviewed by: wma
Obtained from: Semihalf
Sponsored by: Cavium
Differential Revision: https://reviews.freebsd.org/D5423

Improve VNIC performance on Tx path by immediate packet transmission

Don't postpone Tx if the Tx lock can be acquired now.
This gives 3x better performance on egress.

Reviewed by: wma
Obtained from: Semihalf
Sponsored by: Cavium
Differential Revision: https://reviews.freebsd.org/D5325

Enable LRO support for VNIC driver

Support for software LRO when enabled in the capabilities

Reviewed by: wma
Obtained from: Semihalf
Sponsored by: Cavium
Differential Revision: https://reviews.freebsd.org/D5321

Introduce initial support for Cavium's ThunderX networking interface

- The driver consists of three main componens: PF, VF, BGX
- Requires appropriate entries in DTS and MDIO driver
- Supports only FDT configuration
- Multiple Tx queues and single Rx queue supported
- No RSS, HW checksum and TSO support
- No more than 8 queues per-IF (only one Queue Set per IF)
- HW statistics enabled
- Works in all available MAC modes (1,10,20,40G)
- Style converted to BSD according to style(9)
- The code brings lmac_if interface used by the BGX driver to
update its logical MACs state.

Obtained from: Semihalf
Sponsored by: The FreeBSD Foundation

Raw import of ThunderX VNIC networking driver components

This import brings following components of the Linux driver:
- Thunder BGX (programmable MAC)
- Physical Function driver
- Virtual Function driver
- Headers

Revision: 1.0
Obtained from: Cavium
License information: Cavium provided these files under BSD license