xref: /openbmc/linux/net/dsa/netlink.c (revision bfa87ac8)
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  };
64