ipoib_netlink.c

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/*
 * Copyright (c) 2012 Mellanox Technologies. -  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/netdevice.h>
#include <linux/module.h>
#include <net/rtnetlink.h>
#include "ipoib.h"

static const struct nla_policy ipoib_policy[IFLA_IPOIB_MAX + 1] = {
    [IFLA_IPOIB_PKEY]   = { .type = NLA_U16 },
    [IFLA_IPOIB_MODE]   = { .type = NLA_U16 },
    [IFLA_IPOIB_UMCAST] = { .type = NLA_U16 },
};

static int ipoib_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
    struct ipoib_dev_priv *priv = netdev_priv(dev);
    u16 val;

    if (nla_put_u16(skb, IFLA_IPOIB_PKEY, priv->pkey))
        goto nla_put_failure;

    val = test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
    if (nla_put_u16(skb, IFLA_IPOIB_MODE, val))
        goto nla_put_failure;

    val = test_bit(IPOIB_FLAG_UMCAST, &priv->flags);
    if (nla_put_u16(skb, IFLA_IPOIB_UMCAST, val))
        goto nla_put_failure;

    return 0;

nla_put_failure:
    return -EMSGSIZE;
}

static int ipoib_changelink(struct net_device *dev,
                struct nlattr *tb[], struct nlattr *data[])
{
    u16 mode, umcast;
    int ret = 0;

    if (data[IFLA_IPOIB_MODE]) {
        mode  = nla_get_u16(data[IFLA_IPOIB_MODE]);
        if (mode == IPOIB_MODE_DATAGRAM)
            ret = ipoib_set_mode(dev, "datagram\n");
        else if (mode == IPOIB_MODE_CONNECTED)
            ret = ipoib_set_mode(dev, "connected\n");
        else
            ret = -EINVAL;

        if (ret < 0)
            goto out_err;
    }

    if (data[IFLA_IPOIB_UMCAST]) {
        umcast = nla_get_u16(data[IFLA_IPOIB_UMCAST]);
        ipoib_set_umcast(dev, umcast);
    }

out_err:
    return ret;
}

static int ipoib_new_child_link(struct net *src_net, struct net_device *dev,
                   struct nlattr *tb[], struct nlattr *data[])
{
    struct net_device *pdev;
    struct ipoib_dev_priv *ppriv;
    u16 child_pkey;
    int err;

    if (!tb[IFLA_LINK])
        return -EINVAL;

    pdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
    if (!pdev)
        return -ENODEV;

    ppriv = netdev_priv(pdev);

    if (test_bit(IPOIB_FLAG_SUBINTERFACE, &ppriv->flags)) {
        ipoib_warn(ppriv, "child creation disallowed for child devices\n");
        return -EINVAL;
    }

    if (!data || !data[IFLA_IPOIB_PKEY]) {
        ipoib_dbg(ppriv, "no pkey specified, using parent pkey\n");
        child_pkey  = ppriv->pkey;
    } else
        child_pkey  = nla_get_u16(data[IFLA_IPOIB_PKEY]);

    err = __ipoib_vlan_add(ppriv, netdev_priv(dev), child_pkey, IPOIB_RTNL_CHILD);

    if (!err && data)
        err = ipoib_changelink(dev, tb, data);
    return err;
}

static void ipoib_unregister_child_dev(struct net_device *dev, struct list_head *head)
{
    struct ipoib_dev_priv *priv, *ppriv;

    priv = netdev_priv(dev);
    ppriv = netdev_priv(priv->parent);

    mutex_lock(&ppriv->vlan_mutex);
    unregister_netdevice_queue(dev, head);
    list_del(&priv->list);
    mutex_unlock(&ppriv->vlan_mutex);
}

static size_t ipoib_get_size(const struct net_device *dev)
{
    return nla_total_size(2) +  /* IFLA_IPOIB_PKEY   */
        nla_total_size(2) + /* IFLA_IPOIB_MODE   */
        nla_total_size(2);  /* IFLA_IPOIB_UMCAST */
}

static struct rtnl_link_ops ipoib_link_ops __read_mostly = {
    .kind       = "ipoib",
    .maxtype    = IFLA_IPOIB_MAX,
    .policy     = ipoib_policy,
    .priv_size  = sizeof(struct ipoib_dev_priv),
    .setup      = ipoib_setup,
    .newlink    = ipoib_new_child_link,
    .changelink = ipoib_changelink,
    .dellink    = ipoib_unregister_child_dev,
    .get_size   = ipoib_get_size,
    .fill_info  = ipoib_fill_info,
};

int __init ipoib_netlink_init(void)
{
    return rtnl_link_register(&ipoib_link_ops);
}

void __exit ipoib_netlink_fini(void)
{
    rtnl_link_unregister(&ipoib_link_ops);
}

MODULE_ALIAS_RTNL_LINK("ipoib");