freebsd-dev/sys/cam/ctl/ctl_frontend.c
Kenneth D. Merry bf8f8f340e Change the SCSI INQUIRY peripheral qualifier that CTL reports for LUNs
that don't exist.

Anecdotal evidence indicates that it is better to return 011b (bad LUN)
than 001b (LUN offline).  However, this change also gives the user a
sysctl/tunable, kern.cam.ctl.inquiry_pq_no_lun, to override the change
and return to the previous behavior.  (The previous behavior was to
return 001b, or LUN offline.)

ctl.c:		Change the default inquiry peripheral qualifier to 011b,
		and add a sysctl and tunable to allow the user to change
		it back to 001b if needed.

		Don't insert a Copan copyright statement in the inquiry
		data.  The copyright statements on the files are
		sufficient.

ctl_private.h:	Add sysctl variable context to the CTL softc.

ctl_cmd_table.c,
ctl_frontend_internal.c,
ctl_frontend.c,
ctl_backend.c,
ctl_error.c:	Include sys/sysctl.h.

MFC after:	3 days
2012-04-06 22:23:13 +00:00

189 lines
5.3 KiB
C

/*-
* Copyright (c) 2003 Silicon Graphics International Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_frontend.c#4 $
*/
/*
* CAM Target Layer front end interface code
*
* Author: Ken Merry <ken@FreeBSD.org>
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/types.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/condvar.h>
#include <sys/endian.h>
#include <sys/queue.h>
#include <sys/sysctl.h>
#include <cam/scsi/scsi_all.h>
#include <cam/scsi/scsi_da.h>
#include <cam/ctl/ctl_io.h>
#include <cam/ctl/ctl.h>
#include <cam/ctl/ctl_frontend.h>
#include <cam/ctl/ctl_frontend_internal.h>
#include <cam/ctl/ctl_backend.h>
/* XXX KDM move defines from ctl_ioctl.h to somewhere else */
#include <cam/ctl/ctl_ioctl.h>
#include <cam/ctl/ctl_ha.h>
#include <cam/ctl/ctl_private.h>
#include <cam/ctl/ctl_debug.h>
extern struct ctl_softc *control_softc;
int
ctl_frontend_register(struct ctl_frontend *fe, int master_shelf)
{
struct ctl_io_pool *pool;
int port_num;
int retval;
retval = 0;
KASSERT(control_softc != NULL, ("CTL is not initialized"));
mtx_lock(&control_softc->ctl_lock);
port_num = ctl_ffz(&control_softc->ctl_port_mask, CTL_MAX_PORTS);
if ((port_num == -1)
|| (ctl_set_mask(&control_softc->ctl_port_mask, port_num) == -1)) {
fe->targ_port = -1;
mtx_unlock(&control_softc->ctl_lock);
return (1);
}
control_softc->num_frontends++;
mtx_unlock(&control_softc->ctl_lock);
/*
* We add 20 to whatever the caller requests, so he doesn't get
* burned by queueing things back to the pending sense queue. In
* theory, there should probably only be one outstanding item, at
* most, on the pending sense queue for a LUN. We'll clear the
* pending sense queue on the next command, whether or not it is
* a REQUEST SENSE.
*/
retval = ctl_pool_create(control_softc,
(fe->port_type != CTL_PORT_IOCTL) ?
CTL_POOL_FETD : CTL_POOL_IOCTL,
fe->num_requested_ctl_io + 20, &pool);
if (retval != 0) {
fe->targ_port = -1;
mtx_lock(&control_softc->ctl_lock);
ctl_clear_mask(&control_softc->ctl_port_mask, port_num);
mtx_unlock(&control_softc->ctl_lock);
return (retval);
}
mtx_lock(&control_softc->ctl_lock);
/* For now assume master shelf */
//fe->targ_port = port_num;
fe->targ_port = port_num + (master_shelf!=0 ? 0 : CTL_MAX_PORTS);
fe->max_initiators = CTL_MAX_INIT_PER_PORT;
STAILQ_INSERT_TAIL(&control_softc->fe_list, fe, links);
ctl_pool_acquire(pool);
control_softc->ctl_ports[port_num] = fe;
mtx_unlock(&control_softc->ctl_lock);
fe->ctl_pool_ref = pool;
return (retval);
}
int
ctl_frontend_deregister(struct ctl_frontend *fe)
{
struct ctl_io_pool *pool;
int port_num;
int retval;
retval = 0;
pool = (struct ctl_io_pool *)fe->ctl_pool_ref;
if (fe->targ_port == -1) {
retval = 1;
goto bailout;
}
mtx_lock(&control_softc->ctl_lock);
ctl_pool_invalidate(pool);
ctl_pool_release(pool);
STAILQ_REMOVE(&control_softc->fe_list, fe, ctl_frontend, links);
control_softc->num_frontends--;
port_num = (fe->targ_port < CTL_MAX_PORTS) ? fe->targ_port :
fe->targ_port - CTL_MAX_PORTS;
ctl_clear_mask(&control_softc->ctl_port_mask, port_num);
control_softc->ctl_ports[port_num] = NULL;
mtx_unlock(&control_softc->ctl_lock);
bailout:
return (retval);
}
void
ctl_frontend_set_wwns(struct ctl_frontend *fe, int wwnn_valid, uint64_t wwnn,
int wwpn_valid, uint64_t wwpn)
{
if (wwnn_valid)
fe->wwnn = wwnn;
if (wwpn_valid)
fe->wwpn = wwpn;
}
void
ctl_frontend_online(struct ctl_frontend *fe)
{
fe->port_online(fe->onoff_arg);
/* XXX KDM need a lock here? */
fe->status |= CTL_PORT_STATUS_ONLINE;
}
void
ctl_frontend_offline(struct ctl_frontend *fe)
{
fe->port_offline(fe->onoff_arg);
/* XXX KDM need a lock here? */
fe->status &= ~CTL_PORT_STATUS_ONLINE;
}
/*
* vim: ts=8
*/