sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

mlx5en(4): Use hard-coded 4K page size for RQ/SQ/CQ.

The page size specified for RQ, SQ and CQ is always in units of 4KBytes.
Make sure we subtract MLX5_ADAPTER_PAGE_SHIFT, 12, instead of PAGE_SHIFT
which may vary. This fixes support for using the mlx5en driver on systems
having non-4K page size.

Linux commit:
68cdf5d6e91068c98d6091b193dc7a5ab7dcf5eb

MFC after: 1 week
Sponsored by: NVIDIA Networking

mlx5en: Add missing refcount decrement on link-down.

MFC after: 1 week
Sponsored by: NVIDIA Networking

mlx5/mlx5en: Add SQ remap support

Add support to map an SQ to a specific schedule queue using a
special WQE as performance enhancement.

SQ remap operation is handled by a privileged internal queue, IQ,
and the mapping is enabled from one rate to another.

The transition from paced to non-paced should however always go
through FW.

MFC after: 1 week
Sponsored by: NVIDIA Networking

mlx5en: Implement support for internal queues, IQ.

Internal send queues are regular sendqueues which are reserved for WQE commands
towards the hardware and firmware. These queues typically carry resync
information for ongoing TLS RX connections and when changing schedule queues
for rate limited connections.

The internal queue, IQ, code is more or less a stripped down copy
of the existing SQ managing code with exception of:

1) An optional single segment memory buffer which can be read or
written as a whole by the hardware, may be provided.
2) An optional completion callback for all transmit operations, may
be provided.
3) Does not support mbufs.

MFC after: 1 week
Sponsored by: NVIDIA Networking