92168f4c01
Before iSCSI implementation CTL had no knowledge about frontend drivers, it had only frontends, which really were ports (alike to LUNs, if comparing to backends). But iSCSI added there ioctl() method, which does not belong to frontend as a port, but belongs to a frontend driver.
235 lines
6.3 KiB
C
235 lines
6.3 KiB
C
/*-
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* Copyright (c) 2003 Silicon Graphics International Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*
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* $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_frontend.c#4 $
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*/
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/*
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* CAM Target Layer front end interface code
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*
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* Author: Ken Merry <ken@FreeBSD.org>
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/types.h>
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#include <sys/malloc.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/condvar.h>
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#include <sys/endian.h>
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#include <sys/queue.h>
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#include <sys/sysctl.h>
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#include <cam/scsi/scsi_all.h>
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#include <cam/scsi/scsi_da.h>
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#include <cam/ctl/ctl_io.h>
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#include <cam/ctl/ctl.h>
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#include <cam/ctl/ctl_frontend.h>
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#include <cam/ctl/ctl_frontend_internal.h>
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#include <cam/ctl/ctl_backend.h>
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/* XXX KDM move defines from ctl_ioctl.h to somewhere else */
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#include <cam/ctl/ctl_ioctl.h>
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#include <cam/ctl/ctl_ha.h>
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#include <cam/ctl/ctl_private.h>
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#include <cam/ctl/ctl_debug.h>
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extern struct ctl_softc *control_softc;
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int
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ctl_frontend_register(struct ctl_frontend *fe)
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{
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struct ctl_frontend *fe_tmp;
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KASSERT(control_softc != NULL, ("CTL is not initialized"));
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/*
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* Sanity check, make sure this isn't a duplicate registration.
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*/
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mtx_lock(&control_softc->ctl_lock);
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STAILQ_FOREACH(fe_tmp, &control_softc->fe_list, links) {
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if (strcmp(fe_tmp->name, fe->name) == 0) {
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mtx_unlock(&control_softc->ctl_lock);
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return (-1);
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}
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}
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mtx_unlock(&control_softc->ctl_lock);
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STAILQ_INIT(&fe->port_list);
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/*
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* Call the frontend's initialization routine.
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*/
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if (fe->init != NULL)
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fe->init();
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mtx_lock(&control_softc->ctl_lock);
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control_softc->num_frontends++;
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STAILQ_INSERT_TAIL(&control_softc->fe_list, fe, links);
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mtx_unlock(&control_softc->ctl_lock);
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return (0);
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}
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int
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ctl_frontend_deregister(struct ctl_frontend *fe)
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{
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if (!STAILQ_EMPTY(&fe->port_list))
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return (-1);
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mtx_lock(&control_softc->ctl_lock);
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STAILQ_REMOVE(&control_softc->fe_list, fe, ctl_frontend, links);
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control_softc->num_frontends--;
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mtx_unlock(&control_softc->ctl_lock);
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/*
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* Call the frontend's shutdown routine.
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*/
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if (fe->shutdown != NULL)
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fe->shutdown();
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return (0);
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}
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int
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ctl_port_register(struct ctl_port *port, int master_shelf)
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{
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struct ctl_io_pool *pool;
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int port_num;
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int retval;
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retval = 0;
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KASSERT(control_softc != NULL, ("CTL is not initialized"));
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mtx_lock(&control_softc->ctl_lock);
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port_num = ctl_ffz(&control_softc->ctl_port_mask, CTL_MAX_PORTS);
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if ((port_num == -1)
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|| (ctl_set_mask(&control_softc->ctl_port_mask, port_num) == -1)) {
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port->targ_port = -1;
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mtx_unlock(&control_softc->ctl_lock);
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return (1);
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}
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control_softc->num_ports++;
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mtx_unlock(&control_softc->ctl_lock);
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/*
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* We add 20 to whatever the caller requests, so he doesn't get
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* burned by queueing things back to the pending sense queue. In
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* theory, there should probably only be one outstanding item, at
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* most, on the pending sense queue for a LUN. We'll clear the
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* pending sense queue on the next command, whether or not it is
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* a REQUEST SENSE.
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*/
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retval = ctl_pool_create(control_softc, CTL_POOL_FETD,
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port->num_requested_ctl_io + 20, &pool);
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if (retval != 0) {
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port->targ_port = -1;
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mtx_lock(&control_softc->ctl_lock);
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ctl_clear_mask(&control_softc->ctl_port_mask, port_num);
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mtx_unlock(&control_softc->ctl_lock);
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return (retval);
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}
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port->ctl_pool_ref = pool;
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mtx_lock(&control_softc->ctl_lock);
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port->targ_port = port_num + (master_shelf != 0 ? 0 : CTL_MAX_PORTS);
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port->max_initiators = CTL_MAX_INIT_PER_PORT;
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STAILQ_INSERT_TAIL(&port->frontend->port_list, port, links);
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STAILQ_INSERT_TAIL(&control_softc->port_list, port, links);
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control_softc->ctl_ports[port_num] = port;
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mtx_unlock(&control_softc->ctl_lock);
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return (retval);
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}
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int
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ctl_port_deregister(struct ctl_port *port)
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{
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struct ctl_io_pool *pool;
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int port_num;
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int retval;
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retval = 0;
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pool = (struct ctl_io_pool *)port->ctl_pool_ref;
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if (port->targ_port == -1) {
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retval = 1;
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goto bailout;
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}
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mtx_lock(&control_softc->ctl_lock);
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STAILQ_REMOVE(&control_softc->port_list, port, ctl_port, links);
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STAILQ_REMOVE(&port->frontend->port_list, port, ctl_port, fe_links);
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control_softc->num_ports--;
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port_num = (port->targ_port < CTL_MAX_PORTS) ? port->targ_port :
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port->targ_port - CTL_MAX_PORTS;
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ctl_clear_mask(&control_softc->ctl_port_mask, port_num);
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control_softc->ctl_ports[port_num] = NULL;
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mtx_unlock(&control_softc->ctl_lock);
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ctl_pool_free(pool);
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bailout:
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return (retval);
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}
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void
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ctl_port_set_wwns(struct ctl_port *port, int wwnn_valid, uint64_t wwnn,
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int wwpn_valid, uint64_t wwpn)
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{
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if (wwnn_valid)
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port->wwnn = wwnn;
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if (wwpn_valid)
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port->wwpn = wwpn;
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}
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void
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ctl_port_online(struct ctl_port *port)
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{
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port->port_online(port->onoff_arg);
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/* XXX KDM need a lock here? */
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port->status |= CTL_PORT_STATUS_ONLINE;
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}
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void
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ctl_port_offline(struct ctl_port *port)
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{
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port->port_offline(port->onoff_arg);
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/* XXX KDM need a lock here? */
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port->status &= ~CTL_PORT_STATUS_ONLINE;
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}
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/*
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* vim: ts=8
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*/
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