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/*
* node_device_util.c: helper functions for the node device driver
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include "internal.h"
#include "node_device_util.h"
#include "virlog.h"
#include "virscsihost.h"
#include "virvhba.h"
#include "viralloc.h"
#include "virutil.h"
#define VIR_FROM_THIS VIR_FROM_NODEDEV
VIR_LOG_INIT("node_device.node_device_util");
/* virNodeDeviceGetParentName
* @conn: Connection pointer
* @nodedev_name: Node device to lookup
*
* Lookup the node device by name and return the parent name
*
* Returns parent name on success, caller is responsible for freeing;
* otherwise, returns NULL on failure
*/
char *
virNodeDeviceGetParentName(virConnectPtr conn,
const char *nodedev_name)
{
virNodeDevicePtr device = NULL;
char *parent;
if (!(device = virNodeDeviceLookupByName(conn, nodedev_name))) {
virReportError(VIR_ERR_XML_ERROR,
_("Cannot find '%1$s' in node device database"),
nodedev_name);
return NULL;
}
parent = g_strdup(virNodeDeviceGetParent(device));
virObjectUnref(device);
return parent;
}
/**
* @fchost: Pointer to vHBA adapter
*
* Create a vHBA for Storage. This code accomplishes this via searching
* through the sysfs for scsi_host/fc_host in order to first ensure some
* vHBA doesn't already exist for the requested wwnn/wwpn (e.g. an unmanaged
* vHBA) and to search for the parent vport capable scsi_host by name,
* wwnn/wwpn, or fabric_wwn (if provided). If no parent is provided, then
* a vport capable scsi_host will be selected.
*
* Returns vHBA name on success, NULL on failure with an error message set
*/
char *
virNodeDeviceCreateVport(virStorageAdapterFCHost *fchost)
{
unsigned int parent_host;
char *name = NULL;
g_autofree char *parent_hoststr = NULL;
bool skip_capable_check = false;
VIR_DEBUG("parent='%s', wwnn='%s' wwpn='%s'",
NULLSTR(fchost->parent), fchost->wwnn, fchost->wwpn);
if (fchost->parent) {
parent_hoststr = g_strdup(fchost->parent);
} else if (fchost->parent_wwnn && fchost->parent_wwpn) {
if (!(parent_hoststr = virVHBAGetHostByWWN(NULL, fchost->parent_wwnn,
fchost->parent_wwpn))) {
virReportError(VIR_ERR_XML_ERROR, "%s",
_("cannot find parent using provided wwnn/wwpn"));
return NULL;
}
} else if (fchost->parent_fabric_wwn) {
if (!(parent_hoststr =
virVHBAGetHostByFabricWWN(NULL, fchost->parent_fabric_wwn))) {
virReportError(VIR_ERR_XML_ERROR, "%s",
_("cannot find parent using provided fabric_wwn"));
return NULL;
}
} else {
if (!(parent_hoststr = virVHBAFindVportHost(NULL))) {
virReportError(VIR_ERR_XML_ERROR, "%s",
_("'parent' for vHBA not specified, and "
"cannot find one on this host"));
return NULL;
}
skip_capable_check = true;
}
if (virSCSIHostGetNumber(parent_hoststr, &parent_host) < 0)
return NULL;
/* NOTE:
* We do not save the parent_hoststr in fchost->parent since
* we could be writing out the 'def' to the saved XML config.
* If we wrote out the name in the XML, then future starts would
* always use the same parent rather than finding the "best available"
* parent. Besides we have a way to determine the parent based on
* the 'name' field.
*/
if (!skip_capable_check && !virVHBAPathExists(NULL, parent_host)) {
virReportError(VIR_ERR_XML_ERROR,
_("parent '%1$s' specified for vHBA does not exist"),
parent_hoststr);
return NULL;
}
if (virVHBAManageVport(parent_host, fchost->wwpn, fchost->wwnn,
VPORT_CREATE) < 0)
return NULL;
/* Let's ensure the device was created */
virWaitForDevices();
if (!(name = virVHBAGetHostByWWN(NULL, fchost->wwnn, fchost->wwpn))) {
ignore_value(virVHBAManageVport(parent_host, fchost->wwpn, fchost->wwnn,
VPORT_DELETE));
return NULL;
}
return name;
}
/**
* @conn: Connection pointer
* @fchost: Pointer to vHBA adapter
*
* As long as the vHBA is being managed, search for the scsi_host via the
* provided wwnn/wwpn and then find the corresponding parent scsi_host in
* order to send the delete request.
*
* Returns 0 on success, -1 on failure
*/
int
virNodeDeviceDeleteVport(virConnectPtr conn,
virStorageAdapterFCHost *fchost)
{
g_autofree char *name = NULL;
g_autofree char *scsi_host_name = NULL;
unsigned int parent_host;
g_autofree char *vhba_parent = NULL;
VIR_DEBUG("conn=%p parent='%s', managed='%d' wwnn='%s' wwpn='%s'",
conn, NULLSTR(fchost->parent), fchost->managed,
fchost->wwnn, fchost->wwpn);
/* If we're not managing the deletion of the vHBA, then just return */
if (fchost->managed != VIR_TRISTATE_BOOL_YES)
return 0;
/* Find our vHBA by searching the fc_host sysfs tree for our wwnn/wwpn */
if (!(name = virVHBAGetHostByWWN(NULL, fchost->wwnn, fchost->wwpn))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to find fc_host for wwnn='%1$s' and wwpn='%2$s'"),
fchost->wwnn, fchost->wwpn);
return -1;
}
scsi_host_name = g_strdup_printf("scsi_%s", name);
/* If at startup time we provided a parent, then use that to
* get the parent_host value; otherwise, we have to determine
* the parent scsi_host which we did not save at startup time
*/
if (fchost->parent) {
/* Someone provided a parent string at startup time that
* was the same as the scsi_host - meaning we have a pool
* backed to an HBA, so there won't be a vHBA to delete */
if (STREQ(scsi_host_name, fchost->parent)) {
return 0;
}
if (virSCSIHostGetNumber(fchost->parent, &parent_host) < 0)
return -1;
} else {
if (!(vhba_parent = virNodeDeviceGetParentName(conn, scsi_host_name)))
return -1;
/* If the parent is not a scsi_host, then this is a pool backed
* directly to an HBA and there's no vHBA to remove - so we're done */
if (!STRPREFIX(vhba_parent, "scsi_host")) {
return 0;
}
if (virSCSIHostGetNumber(vhba_parent, &parent_host) < 0)
return -1;
}
if (virVHBAManageVport(parent_host, fchost->wwpn, fchost->wwnn,
VPORT_DELETE) < 0)
return -1;
return 0;
}
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