xref: /openbmc/linux/net/dsa/netlink.c (revision 5917bfe6)
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 
dsa_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)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 
dsa_get_size(const struct net_device * dev)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 
dsa_fill_info(struct sk_buff * skb,const struct net_device * dev)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 };
65