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