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