/*-
 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
 *
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <sys/cdefs.h>
#include <linux/module.h>

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/seq_file.h>

#include <asm/uaccess.h>

#include "ipoib.h"

static ssize_t show_parent(struct device *d, struct device_attribute *attr,
                           char *buf)
{
        if_t dev = to_net_dev(d);
        struct ipoib_dev_priv *priv = dev->if_softc;

        return sprintf(buf, "%s\n", priv->parent->name);
}
static DEVICE_ATTR(parent, S_IRUGO, show_parent, NULL);

int ipoib_vlan_add(if_t pdev, unsigned short pkey)
{
        struct ipoib_dev_priv *ppriv, *priv;
        char intf_name[IFNAMSIZ];
        int result;

        if (!capable(CAP_NET_ADMIN))
                return -EPERM;

        ppriv = pdev->if_softc;

        rtnl_lock();
        mutex_lock(&ppriv->vlan_mutex);

        /*
         * First ensure this isn't a duplicate. We check the parent device and
         * then all of the child interfaces to make sure the Pkey doesn't match.
         */
        if (ppriv->pkey == pkey) {
                result = -ENOTUNIQ;
                priv = NULL;
                goto err;
        }

        list_for_each_entry(priv, &ppriv->child_intfs, list) {
                if (priv->pkey == pkey) {
                        result = -ENOTUNIQ;
                        priv = NULL;
                        goto err;
                }
        }

        snprintf(intf_name, sizeof intf_name, "%s.%04x",
                 ppriv->dev->name, pkey);
        priv = ipoib_intf_alloc(intf_name, ppriv->ca);
        if (!priv) {
                result = -ENOMEM;
                goto err;
        }

        priv->max_ib_mtu = ppriv->max_ib_mtu;
        /* MTU will be reset when mcast join happens */
        priv->dev->mtu   = IPOIB_UD_MTU(priv->max_ib_mtu);
        priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
        set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);

        result = ipoib_set_dev_features(priv, ppriv->ca);
        if (result)
                goto err;

        priv->pkey = pkey;

        memcpy(if_getlladdr(priv->dev), ppriv->dev->dev_addr, INFINIBAND_ALEN);
        priv->broadcastaddr[8] = pkey >> 8;
        priv->broadcastaddr[9] = pkey & 0xff;

        result = ipoib_dev_init(priv->dev, ppriv->ca, ppriv->port);
        if (result < 0) {
                ipoib_warn(ppriv, "failed to initialize subinterface: "
                           "device %s, port %d",
                           ppriv->ca->name, ppriv->port);
                goto err;
        }

        result = register_netdevice(priv->dev);
        if (result) {
                ipoib_warn(priv, "failed to initialize; error %i", result);
                goto register_failed;
        }

        priv->parent = ppriv->dev;

        ipoib_create_debug_files(priv->dev);

        if (ipoib_cm_add_mode_attr(priv->dev))
                goto sysfs_failed;
        if (ipoib_add_pkey_attr(priv->dev))
                goto sysfs_failed;
        if (ipoib_add_umcast_attr(priv->dev))
                goto sysfs_failed;

        if (device_create_file(&priv->dev->dev, &dev_attr_parent))
                goto sysfs_failed;

        list_add_tail(&priv->list, &ppriv->child_intfs);

        mutex_unlock(&ppriv->vlan_mutex);
        rtnl_unlock();

        return 0;

sysfs_failed:
        ipoib_delete_debug_files(priv->dev);
        unregister_netdevice(priv->dev);

register_failed:
        ipoib_dev_cleanup(priv->dev);

err:
        mutex_unlock(&ppriv->vlan_mutex);
        rtnl_unlock();
        if (priv)
                free_netdev(priv->dev);

        return result;
}

int ipoib_vlan_delete(if_t pdev, unsigned short pkey)
{
        struct ipoib_dev_priv *ppriv, *priv, *tpriv;
        if_t dev = NULL;

        if (!capable(CAP_NET_ADMIN))
                return -EPERM;

        ppriv = pdev->if_softc;

        rtnl_lock();
        mutex_lock(&ppriv->vlan_mutex);
        list_for_each_entry_safe(priv, tpriv, &ppriv->child_intfs, list) {
                if (priv->pkey == pkey) {
                        unregister_netdevice(priv->dev);
                        ipoib_dev_cleanup(priv->dev);
                        list_del(&priv->list);
                        dev = priv->dev;
                        break;
                }
        }
        mutex_unlock(&ppriv->vlan_mutex);
        rtnl_unlock();

        if (dev) {
                free_netdev(dev);
                return 0;
        }

        return -ENODEV;
}