Rework CTL frontend & backend options to use nv(3), allow creating multiple

ioctl frontend ports.

This revision introduces two changes to CTL:
- Changes the way options are passed to CTL_LUN_REQ and CTL_PORT_REQ ioctls.
  Removes ctl_be_arg structure and associated logic and replaces it with
  nv(3)-based logic for passing in and out arguments.
- Allows creating multiple ioctl frontend ports using either ctladm(8) or
  ctld(8).
  New frontend ports are represented by /dev/cam/ctl<pp>.<vp> nodes, eg /dev/cam/ctl5.3.
  Those device nodes respond only to CTL_IO ioctl.

New command-line options for ctladm:
# creates new ioctl frontend port with using free pp and vp=0
ctladm port -c
# creates new ioctl frontend port with pp=10 and vp=0
ctladm port -c -O pp=10
# creates new ioctl frontend port with pp=11 and vp=12
ctladm port -c -O pp=11 -O vp=12
# removes port with number 4 (it's a "targ_port" number, not pp number)
ctladm port -r -p 4

New syntax for ctl.conf:
target ... {
    port ioctl/<pp>
    ...
}

target ... {
    port ioctl/<pp>/<vp>
    ...

Note: Most of this work was made by jceel@, thank you.

Submitted by:	jceel
Reworked by:	myself
Reviewed by:	mav (earlier versions and recently during the rework)
Obtained from:  FreeNAS and TrueOS
Relnotes:	Yes
Sponsored by:	iXsystems Inc.
Differential Revision:	https://reviews.freebsd.org/D9299

1 files changed, 1 insertions, 1 deletions

diff --git a/usr.sbin/ctld/Makefile b/usr.sbin/ctld/Makefile
index 944b94d663c8..2d13099c7a9a 100644
--- a/usr.sbin/ctld/Makefile
+++ b/usr.sbin/ctld/Makefile
@@ -15,7 +15,7 @@ CFLAGS+=	-I${SRCTOP}/sys/dev/iscsi
 #CFLAGS+=	-DICL_KERNEL_PROXY
 MAN=		ctld.8 ctl.conf.5
 
-LIBADD=		bsdxml l md sbuf util ucl m
+LIBADD=		bsdxml l md sbuf util ucl m nv
 
 YFLAGS+=	-v
 CLEANFILES=	y.tab.c y.tab.h y.output