fc_npiv.c

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/*
 * 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>

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;
}
EXPORT_SYMBOL(libfc_vport_create);

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;
}
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,
};

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);
    }
}

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);
}
EXPORT_SYMBOL(fc_vport_setlink);

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);
    }
}