Release 4.7 drivers/scsi/libfc/fc_npiv.c
/*
* Copyright(c) 2009 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
* Maintained at www.Open-FCoE.org
*/
/*
* NPIV VN_Port helper functions for libfc
*/
#include <scsi/libfc.h>
#include <linux/export.h>
/**
* libfc_vport_create() - Create a new NPIV vport instance
* @vport: fc_vport structure from scsi_transport_fc
* @privsize: driver private data size to allocate along with the Scsi_Host
*/
struct fc_lport *libfc_vport_create(struct fc_vport *vport, int privsize)
{
struct Scsi_Host *shost = vport_to_shost(vport);
struct fc_lport *n_port = shost_priv(shost);
struct fc_lport *vn_port;
vn_port = libfc_host_alloc(shost->hostt, privsize);
if (!vn_port)
return vn_port;
vn_port->vport = vport;
vport->dd_data = vn_port;
mutex_lock(&n_port->lp_mutex);
list_add_tail(&vn_port->list, &n_port->vports);
mutex_unlock(&n_port->lp_mutex);
return vn_port;
}
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EXPORT_SYMBOL(libfc_vport_create);
/**
* fc_vport_id_lookup() - find NPIV lport that matches a given fabric ID
* @n_port: Top level N_Port which may have multiple NPIV VN_Ports
* @port_id: Fabric ID to find a match for
*
* Returns: matching lport pointer or NULL if there is no match
*/
struct fc_lport *fc_vport_id_lookup(struct fc_lport *n_port, u32 port_id)
{
struct fc_lport *lport = NULL;
struct fc_lport *vn_port;
if (n_port->port_id == port_id)
return n_port;
if (port_id == FC_FID_FLOGI)
return n_port; /* for point-to-point */
mutex_lock(&n_port->lp_mutex);
list_for_each_entry(vn_port, &n_port->vports, list) {
if (vn_port->port_id == port_id) {
lport = vn_port;
break;
}
}
mutex_unlock(&n_port->lp_mutex);
return lport;
}
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EXPORT_SYMBOL(fc_vport_id_lookup);
/*
* When setting the link state of vports during an lport state change, it's
* necessary to hold the lp_mutex of both the N_Port and the VN_Port.
* This tells the lockdep engine to treat the nested locking of the VN_Port
* as a different lock class.
*/
enum libfc_lport_mutex_class {
LPORT_MUTEX_NORMAL = 0,
LPORT_MUTEX_VN_PORT = 1,
};
/**
* __fc_vport_setlink() - update link and status on a VN_Port
* @n_port: parent N_Port
* @vn_port: VN_Port to update
*
* Locking: must be called with both the N_Port and VN_Port lp_mutex held
*/
static void __fc_vport_setlink(struct fc_lport *n_port,
struct fc_lport *vn_port)
{
struct fc_vport *vport = vn_port->vport;
if (vn_port->state == LPORT_ST_DISABLED)
return;
if (n_port->state == LPORT_ST_READY) {
if (n_port->npiv_enabled) {
fc_vport_set_state(vport, FC_VPORT_INITIALIZING);
__fc_linkup(vn_port);
} else {
fc_vport_set_state(vport, FC_VPORT_NO_FABRIC_SUPP);
__fc_linkdown(vn_port);
}
} else {
fc_vport_set_state(vport, FC_VPORT_LINKDOWN);
__fc_linkdown(vn_port);
}
}
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/**
* fc_vport_setlink() - update link and status on a VN_Port
* @vn_port: virtual port to update
*/
void fc_vport_setlink(struct fc_lport *vn_port)
{
struct fc_vport *vport = vn_port->vport;
struct Scsi_Host *shost = vport_to_shost(vport);
struct fc_lport *n_port = shost_priv(shost);
mutex_lock(&n_port->lp_mutex);
mutex_lock_nested(&vn_port->lp_mutex, LPORT_MUTEX_VN_PORT);
__fc_vport_setlink(n_port, vn_port);
mutex_unlock(&vn_port->lp_mutex);
mutex_unlock(&n_port->lp_mutex);
}
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EXPORT_SYMBOL(fc_vport_setlink);
/**
* fc_vports_linkchange() - change the link state of all vports
* @n_port: Parent N_Port that has changed state
*
* Locking: called with the n_port lp_mutex held
*/
void fc_vports_linkchange(struct fc_lport *n_port)
{
struct fc_lport *vn_port;
list_for_each_entry(vn_port, &n_port->vports, list) {
mutex_lock_nested(&vn_port->lp_mutex, LPORT_MUTEX_VN_PORT);
__fc_vport_setlink(n_port, vn_port);
mutex_unlock(&vn_port->lp_mutex);
}
}
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