drivers/infiniband/ulp/ipoib/ipoib_netlink.c

   1 /*
   2  * Copyright (c) 2012 Mellanox Technologies. -  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/netdevice.h>
  34 #include <linux/module.h>
  35 #include <net/rtnetlink.h>
  36 #include "ipoib.h"
  37
  38 static const struct nla_policy ipoib_policy[IFLA_IPOIB_MAX + 1] = {
  39         [IFLA_IPOIB_PKEY]       = { .type = NLA_U16 },
  40         [IFLA_IPOIB_MODE]       = { .type = NLA_U16 },
  41         [IFLA_IPOIB_UMCAST]     = { .type = NLA_U16 },
  42 };
  43
  44 static int ipoib_fill_info(struct sk_buff *skb, const struct net_device *dev)
  45 {
  46         struct ipoib_dev_priv *priv = netdev_priv(dev);
  47         u16 val;
  48
  49         if (nla_put_u16(skb, IFLA_IPOIB_PKEY, priv->pkey))
  50                 goto nla_put_failure;
  51
  52         val = test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
  53         if (nla_put_u16(skb, IFLA_IPOIB_MODE, val))
  54                 goto nla_put_failure;
  55
  56         val = test_bit(IPOIB_FLAG_UMCAST, &priv->flags);
  57         if (nla_put_u16(skb, IFLA_IPOIB_UMCAST, val))
  58                 goto nla_put_failure;
  59
  60         return 0;
  61
  62 nla_put_failure:
  63         return -EMSGSIZE;
  64 }
  65
  66 static int ipoib_changelink(struct net_device *dev,
  67                             struct nlattr *tb[], struct nlattr *data[])
  68 {
  69         u16 mode, umcast;
  70         int ret = 0;
  71
  72         if (data[IFLA_IPOIB_MODE]) {
  73                 mode  = nla_get_u16(data[IFLA_IPOIB_MODE]);
  74                 if (mode == IPOIB_MODE_DATAGRAM)
  75                         ret = ipoib_set_mode(dev, "datagram\n");
  76                 else if (mode == IPOIB_MODE_CONNECTED)
  77                         ret = ipoib_set_mode(dev, "connected\n");
  78                 else
  79                         ret = -EINVAL;
  80
  81                 if (ret < 0)
  82                         goto out_err;
  83         }
  84
  85         if (data[IFLA_IPOIB_UMCAST]) {
  86                 umcast = nla_get_u16(data[IFLA_IPOIB_UMCAST]);
  87                 ipoib_set_umcast(dev, umcast);
  88         }
  89
  90 out_err:
  91         return ret;
  92 }
  93
  94 static int ipoib_new_child_link(struct net *src_net, struct net_device *dev,
  95                                struct nlattr *tb[], struct nlattr *data[])
  96 {
  97         struct net_device *pdev;
  98         struct ipoib_dev_priv *ppriv;
  99         u16 child_pkey;
 100         int err;
 101
 102         if (!tb[IFLA_LINK])
 103                 return -EINVAL;
 104
 105         pdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 106         if (!pdev)
 107                 return -ENODEV;
 108
 109         ppriv = netdev_priv(pdev);
 110
 111         if (test_bit(IPOIB_FLAG_SUBINTERFACE, &ppriv->flags)) {
 112                 ipoib_warn(ppriv, "child creation disallowed for child devices\n");
 113                 return -EINVAL;
 114         }
 115
 116         if (!data || !data[IFLA_IPOIB_PKEY]) {
 117                 ipoib_dbg(ppriv, "no pkey specified, using parent pkey\n");
 118                 child_pkey  = ppriv->pkey;
 119         } else
 120                 child_pkey  = nla_get_u16(data[IFLA_IPOIB_PKEY]);
 121
 122         if (child_pkey == 0 || child_pkey == 0x8000)
 123                 return -EINVAL;
 124
 125         /*
 126          * Set the full membership bit, so that we join the right
 127          * broadcast group, etc.
 128          */
 129         child_pkey |= 0x8000;
 130
 131         err = __ipoib_vlan_add(ppriv, netdev_priv(dev), child_pkey, IPOIB_RTNL_CHILD);
 132
 133         if (!err && data)
 134                 err = ipoib_changelink(dev, tb, data);
 135         return err;
 136 }
 137
 138 static void ipoib_unregister_child_dev(struct net_device *dev, struct list_head *head)
 139 {
 140         struct ipoib_dev_priv *priv, *ppriv;
 141
 142         priv = netdev_priv(dev);
 143         ppriv = netdev_priv(priv->parent);
 144
 145         mutex_lock(&ppriv->vlan_mutex);
 146         unregister_netdevice_queue(dev, head);
 147         list_del(&priv->list);
 148         mutex_unlock(&ppriv->vlan_mutex);
 149 }
 150
 151 static size_t ipoib_get_size(const struct net_device *dev)
 152 {
 153         return nla_total_size(2) +      /* IFLA_IPOIB_PKEY   */
 154                 nla_total_size(2) +     /* IFLA_IPOIB_MODE   */
 155                 nla_total_size(2);      /* IFLA_IPOIB_UMCAST */
 156 }
 157
 158 static struct rtnl_link_ops ipoib_link_ops __read_mostly = {
 159         .kind           = "ipoib",
 160         .maxtype        = IFLA_IPOIB_MAX,
 161         .policy         = ipoib_policy,
 162         .priv_size      = sizeof(struct ipoib_dev_priv),
 163         .setup          = ipoib_setup,
 164         .newlink        = ipoib_new_child_link,
 165         .changelink     = ipoib_changelink,
 166         .dellink        = ipoib_unregister_child_dev,
 167         .get_size       = ipoib_get_size,
 168         .fill_info      = ipoib_fill_info,
 169 };
 170
 171 int __init ipoib_netlink_init(void)
 172 {
 173         return rtnl_link_register(&ipoib_link_ops);
 174 }
 175
 176 void __exit ipoib_netlink_fini(void)
 177 {
 178         rtnl_link_unregister(&ipoib_link_ops);
 179 }
 180
 181 MODULE_ALIAS_RTNL_LINK("ipoib");