net/dsa/netlink.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright 2022 NXP
   3  */
   4 #include <linux/netdevice.h>
   5 #include <net/rtnetlink.h>
   6
   7 #include "netlink.h"
   8 #include "slave.h"
   9
  10 static const struct nla_policy dsa_policy[IFLA_DSA_MAX + 1] = {
  11         [IFLA_DSA_MASTER]       = { .type = NLA_U32 },
  12 };
  13
  14 static int dsa_changelink(struct net_device *dev, struct nlattr *tb[],
  15                           struct nlattr *data[],
  16                           struct netlink_ext_ack *extack)
  17 {
  18         int err;
  19
  20         if (!data)
  21                 return 0;
  22
  23         if (data[IFLA_DSA_MASTER]) {
  24                 u32 ifindex = nla_get_u32(data[IFLA_DSA_MASTER]);
  25                 struct net_device *master;
  26
  27                 master = __dev_get_by_index(dev_net(dev), ifindex);
  28                 if (!master)
  29                         return -EINVAL;
  30
  31                 err = dsa_slave_change_master(dev, master, extack);
  32                 if (err)
  33                         return err;
  34         }
  35
  36         return 0;
  37 }
  38
  39 static size_t dsa_get_size(const struct net_device *dev)
  40 {
  41         return nla_total_size(sizeof(u32)) +    /* IFLA_DSA_MASTER  */
  42                0;
  43 }
  44
  45 static int dsa_fill_info(struct sk_buff *skb, const struct net_device *dev)
  46 {
  47         struct net_device *master = dsa_slave_to_master(dev);
  48
  49         if (nla_put_u32(skb, IFLA_DSA_MASTER, master->ifindex))
  50                 return -EMSGSIZE;
  51
  52         return 0;
  53 }
  54
  55 struct rtnl_link_ops dsa_link_ops __read_mostly = {
  56         .kind                   = "dsa",
  57         .priv_size              = sizeof(struct dsa_port),
  58         .maxtype                = IFLA_DSA_MAX,
  59         .policy                 = dsa_policy,
  60         .changelink             = dsa_changelink,
  61         .get_size               = dsa_get_size,
  62         .fill_info              = dsa_fill_info,
  63         .netns_refund           = true,
  64 };