Remove residual blank line at start of Makefile

This is a residual of the $FreeBSD$ removal.

MFC After: 3 days (though I'll just run the command on the branches)
Sponsored by: Netflix

ctl: Support for NVMe commands

- Add support for queueing and executing NVMe admin and NVM commands
via ctl_run and ctl_queue. This requires fixing a few places that
were SCSI-specific to add N

ctl: Support for NVMe commands

- Add support for queueing and executing NVMe admin and NVM commands
via ctl_run and ctl_queue. This requires fixing a few places that
were SCSI-specific to add NVME logic.

- NVMe has much simpler command ordering requirements than SCSI. In
particular, the HBA is not required to enforce any specific ordering
for requests with overlapping LBAs. The host is required to manage
that ordering. However, fused commands (currently only COMPARE and
WRITE NVM commands can be fused) are required to be executed
atomically.

To support fused commands, make the second half of a fused command
block on the first half, and have commands submitted after a fused
command pair block on the second half.

- Add handlers and command tables for admin and NVM commands that
operate on individual namespaces and will be passed down from an
NVMe over Fabrics controller to a CTL LUN.

Reviewed by: ken, imp
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D44720

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ctl: Support NVMe requests in debug trace functions

Reviewed by: imp
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D44719

sys: Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

Fix some modules to export more used symbols

and remove non-present symbols that are now reported by kmod_syms.awk.

Reviewed by: emaste
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differ

Fix some modules to export more used symbols

and remove non-present symbols that are now reported by kmod_syms.awk.

Reviewed by: emaste
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D32878

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Split iscsi(4) ctl frontend off of ctl(4) as cfiscsi(4)

The goal of this work is to remove the explicit dependency for ctl(4)
on iscsi(4), so end-users without iscsi(4) support in the kernel can
use

Split iscsi(4) ctl frontend off of ctl(4) as cfiscsi(4)

The goal of this work is to remove the explicit dependency for ctl(4)
on iscsi(4), so end-users without iscsi(4) support in the kernel can
use ctl(4) for its other functions.

This allows those without iscsi(4) support built into the kernel to use
ctl(4) as a test mechanism. As a sidenote, this was possible around the
10.0-RELEASE period, but made impossible for end-users without iscsi(4)
between 10.0-RELEASE and 11.0-RELEASE.

Automatically load cfiscsi(4) from ctladm(8) and ctld(8) for backwards
compatibility with previously releases. The automatic loading feature is
compiled into the beforementioned tools if MK_ISCSI == yes when building
world.

Add a manpage for cfiscsi(4) and refer to it in ctl(4).

Differential Revision: D10099
MFC after: 2 months
Relnotes: yes
Reviewed by: mav, trasz
Sponsored by: Dell EMC Isilon

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sys/modules: normalize .CURDIR-relative paths to SRCTOP

This simplifies make output/logic

Tested with: `cd sys/modules; make ALL_MODULES=` on amd64
MFC after: 1 month
Sponsored by: Dell EMC Isilon

Merge from head

Sponsored by: Gandi.net

Merge from head

Sync up with head (up to r288341).

Finish merging from head, messed up in previous attempt

Merge ^/head r287527 through r287679.

Reimplement CTL High Availability.

CTL HA functionality was originally implemented by Copan many years ago,
but large part of the sources was never published. This change includes
clean room implem

Reimplement CTL High Availability.

CTL HA functionality was originally implemented by Copan many years ago,
but large part of the sources was never published. This change includes
clean room implementation of the missing code and fixes for many bugs.

This code supports dual-node HA with ALUA in four modes:
- Active/Unavailable without interlink between nodes;
- Active/Standby with second node handling only basic LUN discovery and
reservation, synchronizing with the first node through the interlink;
- Active/Active with both nodes processing commands and accessing the
backing storage, synchronizing with the first node through the interlink;
- Active/Active with second node working as proxy, transfering all
commands to the first node for execution through the interlink.

Unlike original Copan's implementation, depending on specific hardware,
this code uses simple custom TCP-based protocol for interlink. It has
no authentication, so it should never be enabled on public interfaces.

The code may still need some polishing, but generally it is functional.

Relnotes: yes
Sponsored by: iXsystems, Inc.

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Merge r286744-r287584 from head.

Merge from HEAD

Merge ^/head r286697 through r286857.

Move "ioctl" CAM frontend into separate file.

It has nothing to share with too huge ctl.c other then device descriptor,
but even that may be counted as design error that may be fixed later.
At some

Move "ioctl" CAM frontend into separate file.

It has nothing to share with too huge ctl.c other then device descriptor,
but even that may be counted as design error that may be fixed later.
At some point we may even want to have several ioctl ports.

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Drop "internal" CTL frontend.

Its idea was to be a simple initiator and execute several commands from
kernel level, but FreeBSD never had consumer for that functionality,
while its implementation po

Drop "internal" CTL frontend.

Its idea was to be a simple initiator and execute several commands from
kernel level, but FreeBSD never had consumer for that functionality,
while its implementation polluted many unrelated places..

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Merge sync of head

Merge from HEAD

Merge ^/head r277956 through r277974.

Add kobj interface between ICL and the rest of the iSCSI stack.
Review note - icl.c was moved to icl_soft.c.

MFC after: 1 month
Sponsored by: The FreeBSD Foundation

IFC @r269962

Submitted by: Anish Gupta (akgupt3@gmail.com)

Merge head from 7/28

Sync to HEAD@r269943.