MFC r325517, r325554

r325517:
ctl: Make max_luns and max_ports tunable variables instead of hardcoded
defines.

Reviewed by: trasz (earlier version), bapt (earlier version), bcr (manpages)
Sponsored by: Gandi.net
Differential Revision: https://reviews.freebsd.org/D12836

r325554:
ctl(4): Insert a new line after a sentence-ending full stop.

Reported by: bjk
Sponsored by: Gandi.net
X-MFC-With: r325517

MFC r314659,r314676:

r314659:

usr.sbin: normalize paths using SRCTOP-relative paths or :H when possible

This simplifies make logic/output

r314676:

Fix build after r314656

Some of the changes I introduced to use .ALLSRC were correct in spirit,
but incorrect in reality -- in particular, ../Makefile.inc hadn't been
pulled in via bsd.init.mk (via bsd.lib.mk, bsd.prog.mk), so the value
of .ALLSRC (evaluated immediately) was empty. .include bsd.init.mk
explicitly so we can be certain that the values used as dependencies in
the targets are defined when the target recipe has been evaluated.

Reminder: thou shalt separate out separate functional changes before
committing them.

(YUGE) Pointyhat to: ngie
In collaboration with: bdrewery

MFC r315561:
r315561 (by trasz):

Bring back the "i". The point is to make it easy to find via "apropos
iscsi", along with all the other relevant components.

MFC r313959:

Add USB Mass Storage CTL frontend. This makes it possible
for USB OTG-capable hardware to implement device side of USB
Mass Storage, ie pretend it's a flash drive. It's configured
in the same way as other CTL frontends, using ctladm(8)
or ctld(8). Differently from usfs(4), all the configuration
can be done without rebuilding the kernel.

Testing and review is welcome. Right now I'm still moving,
and I don't have access to my test environment, so I'm somewhat
reluctant to making larger changes to this code; on the other
hand I don't want to let it sit on Phab until my testing setup
is back, because I want to get it into 11.1-RELEASE.

Relnotes: yes
Sponsored by: The FreeBSD Foundation

MFC r315087, r315146:
Improve ctl(4) description, including frontends and backends.

MFC r313854, r313963: Change the way MaxCmdSN is used.

Before this change MaxCmdSN was reported as CmdSN + delta, that made it
limit number of requests in transmission from the initiator to target,
that was pretty useless. After this change MaxCmdSN limits number of
requests queued to CTL, i.e. maximal queue depth for the initiator.
The default limit is 256 outstanding requests per initiator at a time.

This code uses existing cs_outstanding_ctl_pdus counter to track queue
depth. It's semantics doen't perfectly match, but close enough to not
add another counter. Just don't set the maxtags below 2.

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

Add to CTL initial support for CDROMs and removable devices.

Relnotes: yes

CTL documentation update, mostly for HA.

Fix mandoc warnings/errors.

MFC after: 1 week

Document kern.cam.ctl.debug sysctl.

MFC after: 1 week

Expand sysctl descriptions in iscsi(4) and ctl(4).

MFC after: 1 week
Sponsored by: The FreeBSD Foundation

Make ctl(4) appear in "man -k iscsi" results.

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation

Expand sysctls descriptions for iscsi(4) and ctl(4).

Differential Revision: https://reviews.freebsd.org/D2876
Reviewed by: wblock@
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation

Start documenting ctl(4) sysctls.

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation

Add a hint that "device ctl" kind of depends on "device iscsi".

It actually doesn't - "device ctl" automatically pulls in ICL, which
would normally be a part of iscsi.ko. However, doing it that way makes
iscsi.ko unloadable, and building ctl.ko without iscsi.ko (using
MODULES_OVERRIDE) results in ctl.ko that is unloadable, due to missing
symbols that would be resolved to iscsi.ko. And since the symbols
are named "icl_whatever", it's not obvious that it's iscsi.ko that's
required.

If there is a better way - let me know.

MFC after: 1 month
Sponsored by: The FreeBSD Foundation

Mention VAAI and ODX in ctl(4).

Reviewed by: mav@
MFC after: 1 month
Sponsored by: The FreeBSD Foundation

use .Mt to mark up email addresses consistently (final part)

PR: 191174
Submitted by: Franco Fichtner <franco at lastsummer.de>

Bring in the new iSCSI target and initiator.

Reviewed by: ken (parts)
Approved by: re (delphij)
Sponsored by: FreeBSD Foundation

Fix dates in manual pages modified in 249009.

Make it possible to build CTL as a module.

Reviewed by: ken
Sponsored by: FreeBSD Foundation