ipoib_vlan.c

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/*
 * 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 <linux/module.h>

#include <linux/init.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)
{
    struct net_device *dev = to_net_dev(d);
    struct ipoib_dev_priv *priv = netdev_priv(dev);

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

int __ipoib_vlan_add(struct ipoib_dev_priv *ppriv, struct ipoib_dev_priv *priv,
             u16 pkey, int type)
{
    int result;

    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(priv->dev->dev_addr, ppriv->dev->dev_addr, INFINIBAND_ALEN);
    priv->dev->broadcast[8] = pkey >> 8;
    priv->dev->broadcast[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);

    /* RTNL childs don't need proprietary sysfs entries */
    if (type == IPOIB_LEGACY_CHILD) {
        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;
    }

    priv->child_type  = type;
    priv->dev->iflink = ppriv->dev->ifindex;
    list_add_tail(&priv->list, &ppriv->child_intfs);

    return 0;

sysfs_failed:
    result = -ENOMEM;
    ipoib_delete_debug_files(priv->dev);
    unregister_netdevice(priv->dev);

register_failed:
    ipoib_dev_cleanup(priv->dev);

err:
    return result;
}

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

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

    ppriv = netdev_priv(pdev);

    snprintf(intf_name, sizeof intf_name, "%s.%04x",
         ppriv->dev->name, pkey);
    priv = ipoib_intf_alloc(intf_name);
    if (!priv)
        return -ENOMEM;

    if (!rtnl_trylock())
        return restart_syscall();

    mutex_lock(&ppriv->vlan_mutex);

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

    list_for_each_entry(tpriv, &ppriv->child_intfs, list) {
        if (tpriv->pkey == pkey &&
            tpriv->child_type == IPOIB_LEGACY_CHILD) {
            result = -ENOTUNIQ;
            goto out;
        }
    }

    result = __ipoib_vlan_add(ppriv, priv, pkey, IPOIB_LEGACY_CHILD);

out:
    mutex_unlock(&ppriv->vlan_mutex);

    if (result)
        free_netdev(priv->dev);

    rtnl_unlock();

    return result;
}

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

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

    ppriv = netdev_priv(pdev);

    if (!rtnl_trylock())
        return restart_syscall();
    mutex_lock(&ppriv->vlan_mutex);
    list_for_each_entry_safe(priv, tpriv, &ppriv->child_intfs, list) {
        if (priv->pkey == pkey &&
            priv->child_type == IPOIB_LEGACY_CHILD) {
            unregister_netdevice(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;
}