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/if_arp.h>      /* For ARPHRD_xxx */
  35 #include <linux/module.h>
  36 #include <net/rtnetlink.h>
  37 #include "ipoib.h"
  38
  39 static const struct nla_policy ipoib_policy[IFLA_IPOIB_MAX + 1] = {
  40         [IFLA_IPOIB_PKEY]       = { .type = NLA_U16 },
  41         [IFLA_IPOIB_MODE]       = { .type = NLA_U16 },
  42         [IFLA_IPOIB_UMCAST]     = { .type = NLA_U16 },
  43 };
  44
  45 static int ipoib_fill_info(struct sk_buff *skb, const struct net_device *dev)
  46 {
  47         struct ipoib_dev_priv *priv = ipoib_priv(dev);
  48         u16 val;
  49
  50         if (nla_put_u16(skb, IFLA_IPOIB_PKEY, priv->pkey))
  51                 goto nla_put_failure;
  52
  53         val = test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
  54         if (nla_put_u16(skb, IFLA_IPOIB_MODE, val))
  55                 goto nla_put_failure;
  56
  57         val = test_bit(IPOIB_FLAG_UMCAST, &priv->flags);
  58         if (nla_put_u16(skb, IFLA_IPOIB_UMCAST, val))
  59                 goto nla_put_failure;
  60
  61         return 0;
  62
  63 nla_put_failure:
  64         return -EMSGSIZE;
  65 }
  66
  67 static int ipoib_changelink(struct net_device *dev, struct nlattr *tb[],
  68                             struct nlattr *data[],
  69                             struct netlink_ext_ack *extack)
  70 {
  71         u16 mode, umcast;
  72         int ret = 0;
  73
  74         if (data[IFLA_IPOIB_MODE]) {
  75                 mode  = nla_get_u16(data[IFLA_IPOIB_MODE]);
  76                 if (mode == IPOIB_MODE_DATAGRAM)
  77                         ret = ipoib_set_mode(dev, "datagram\n");
  78                 else if (mode == IPOIB_MODE_CONNECTED)
  79                         ret = ipoib_set_mode(dev, "connected\n");
  80                 else
  81                         ret = -EINVAL;
  82
  83                 if (ret < 0)
  84                         goto out_err;
  85         }
  86
  87         if (data[IFLA_IPOIB_UMCAST]) {
  88                 umcast = nla_get_u16(data[IFLA_IPOIB_UMCAST]);
  89                 ipoib_set_umcast(dev, umcast);
  90         }
  91
  92 out_err:
  93         return ret;
  94 }
  95
  96 static int ipoib_new_child_link(struct net *src_net, struct net_device *dev,
  97                                 struct nlattr *tb[], struct nlattr *data[],
  98                                 struct netlink_ext_ack *extack)
  99 {
 100         struct net_device *pdev;
 101         struct ipoib_dev_priv *ppriv;
 102         u16 child_pkey;
 103         int err;
 104
 105         if (!tb[IFLA_LINK])
 106                 return -EINVAL;
 107
 108         pdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 109         if (!pdev || pdev->type != ARPHRD_INFINIBAND)
 110                 return -ENODEV;
 111
 112         ppriv = ipoib_priv(pdev);
 113
 114         if (test_bit(IPOIB_FLAG_SUBINTERFACE, &ppriv->flags)) {
 115                 ipoib_warn(ppriv, "child creation disallowed for child devices\n");
 116                 return -EINVAL;
 117         }
 118
 119         if (!data || !data[IFLA_IPOIB_PKEY]) {
 120                 ipoib_dbg(ppriv, "no pkey specified, using parent pkey\n");
 121                 child_pkey  = ppriv->pkey;
 122         } else
 123                 child_pkey  = nla_get_u16(data[IFLA_IPOIB_PKEY]);
 124
 125         if (child_pkey == 0 || child_pkey == 0x8000)
 126                 return -EINVAL;
 127
 128         /*
 129          * Set the full membership bit, so that we join the right
 130          * broadcast group, etc.
 131          */
 132         child_pkey |= 0x8000;
 133
 134         err = __ipoib_vlan_add(ppriv, ipoib_priv(dev),
 135                                child_pkey, IPOIB_RTNL_CHILD);
 136
 137         if (!err && data)
 138                 err = ipoib_changelink(dev, tb, data, extack);
 139         return err;
 140 }
 141
 142 static void ipoib_unregister_child_dev(struct net_device *dev, struct list_head *head)
 143 {
 144         struct ipoib_dev_priv *priv, *ppriv;
 145
 146         priv = ipoib_priv(dev);
 147         ppriv = ipoib_priv(priv->parent);
 148
 149         down_write(&ppriv->vlan_rwsem);
 150         unregister_netdevice_queue(dev, head);
 151         list_del(&priv->list);
 152         up_write(&ppriv->vlan_rwsem);
 153 }
 154
 155 static size_t ipoib_get_size(const struct net_device *dev)
 156 {
 157         return nla_total_size(2) +      /* IFLA_IPOIB_PKEY   */
 158                 nla_total_size(2) +     /* IFLA_IPOIB_MODE   */
 159                 nla_total_size(2);      /* IFLA_IPOIB_UMCAST */
 160 }
 161
 162 static struct rtnl_link_ops ipoib_link_ops __read_mostly = {
 163         .kind           = "ipoib",
 164         .maxtype        = IFLA_IPOIB_MAX,
 165         .policy         = ipoib_policy,
 166         .priv_size      = sizeof(struct ipoib_dev_priv),
 167         .setup          = ipoib_setup_common,
 168         .newlink        = ipoib_new_child_link,
 169         .changelink     = ipoib_changelink,
 170         .dellink        = ipoib_unregister_child_dev,
 171         .get_size       = ipoib_get_size,
 172         .fill_info      = ipoib_fill_info,
 173 };
 174
 175 int __init ipoib_netlink_init(void)
 176 {
 177         return rtnl_link_register(&ipoib_link_ops);
 178 }
 179
 180 void __exit ipoib_netlink_fini(void)
 181 {
 182         rtnl_link_unregister(&ipoib_link_ops);
 183 }
 184
 185 MODULE_ALIAS_RTNL_LINK("ipoib");