1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef _RDMA_NETLINK_H
4#define _RDMA_NETLINK_H
5
6#include <linux/netlink.h>
7#include <uapi/rdma/rdma_netlink.h>
8
9struct ib_device;
10
11enum {
12 RDMA_NLDEV_ATTR_EMPTY_STRING = 1,
13 RDMA_NLDEV_ATTR_ENTRY_STRLEN = 16,
14 RDMA_NLDEV_ATTR_CHARDEV_TYPE_SIZE = 32,
15};
16
17struct rdma_nl_cbs {
18 int (*doit)(struct sk_buff *skb, struct nlmsghdr *nlh,
19 struct netlink_ext_ack *extack);
20 int (*dump)(struct sk_buff *skb, struct netlink_callback *nlcb);
21 u8 flags;
22};
23
24enum rdma_nl_flags {
25 /* Require CAP_NET_ADMIN */
26 RDMA_NL_ADMIN_PERM = 1 << 0,
27};
28
29/* Define this module as providing netlink services for NETLINK_RDMA, with
30 * index _index. Since the client indexes were setup in a uapi header as an
31 * enum and we do no want to change that, the user must supply the expanded
32 * constant as well and the compiler checks they are the same.
33 */
34#define MODULE_ALIAS_RDMA_NETLINK(_index, _val) \
35 static inline void __maybe_unused __chk_##_index(void) \
36 { \
37 BUILD_BUG_ON(_index != _val); \
38 } \
39 MODULE_ALIAS("rdma-netlink-subsys-" __stringify(_val))
40
41/**
42 * Register client in RDMA netlink.
43 * @index: Index of the added client
44 * @cb_table: A table for op->callback
45 */
46void rdma_nl_register(unsigned int index,
47 const struct rdma_nl_cbs cb_table[]);
48
49/**
50 * Remove a client from IB netlink.
51 * @index: Index of the removed IB client.
52 */
53void rdma_nl_unregister(unsigned int index);
54
55/**
56 * Put a new message in a supplied skb.
57 * @skb: The netlink skb.
58 * @nlh: Pointer to put the header of the new netlink message.
59 * @seq: The message sequence number.
60 * @len: The requested message length to allocate.
61 * @client: Calling IB netlink client.
62 * @op: message content op.
63 * Returns the allocated buffer on success and NULL on failure.
64 */
65void *ibnl_put_msg(struct sk_buff *skb, struct nlmsghdr **nlh, int seq,
66 int len, int client, int op, int flags);
67/**
68 * Put a new attribute in a supplied skb.
69 * @skb: The netlink skb.
70 * @nlh: Header of the netlink message to append the attribute to.
71 * @len: The length of the attribute data.
72 * @data: The attribute data to put.
73 * @type: The attribute type.
74 * Returns the 0 and a negative error code on failure.
75 */
76int ibnl_put_attr(struct sk_buff *skb, struct nlmsghdr *nlh,
77 int len, void *data, int type);
78
79/**
80 * Send the supplied skb to a specific userspace PID.
81 * @net: Net namespace in which to send the skb
82 * @skb: The netlink skb
83 * @pid: Userspace netlink process ID
84 * Returns 0 on success or a negative error code.
85 */
86int rdma_nl_unicast(struct net *net, struct sk_buff *skb, u32 pid);
87
88/**
89 * Send, with wait/1 retry, the supplied skb to a specific userspace PID.
90 * @net: Net namespace in which to send the skb
91 * @skb: The netlink skb
92 * @pid: Userspace netlink process ID
93 * Returns 0 on success or a negative error code.
94 */
95int rdma_nl_unicast_wait(struct net *net, struct sk_buff *skb, __u32 pid);
96
97/**
98 * Send the supplied skb to a netlink group.
99 * @net: Net namespace in which to send the skb
100 * @skb: The netlink skb
101 * @group: Netlink group ID
102 * @flags: allocation flags
103 * Returns 0 on success or a negative error code.
104 */
105int rdma_nl_multicast(struct net *net, struct sk_buff *skb,
106 unsigned int group, gfp_t flags);
107
108/**
109 * Check if there are any listeners to the netlink group
110 * @group: the netlink group ID
111 * Returns true on success or false if no listeners.
112 */
113bool rdma_nl_chk_listeners(unsigned int group);
114
115/**
116 * Prepare and send an event message
117 * @ib: the IB device which triggered the event
118 * @port_num: the port number which triggered the event - 0 if unused
119 * @type: the event type
120 * Returns 0 on success or a negative error code
121 */
122int rdma_nl_notify_event(struct ib_device *ib, u32 port_num,
123 enum rdma_nl_notify_event_type type);
124
125struct rdma_link_ops {
126 struct list_head list;
127 const char *type;
128 int (*newlink)(const char *ibdev_name, struct net_device *ndev);
129};
130
131void rdma_link_register(struct rdma_link_ops *ops);
132void rdma_link_unregister(struct rdma_link_ops *ops);
133
134#define MODULE_ALIAS_RDMA_LINK(type) MODULE_ALIAS("rdma-link-" type)
135#define MODULE_ALIAS_RDMA_CLIENT(type) MODULE_ALIAS("rdma-client-" type)
136
137#endif /* _RDMA_NETLINK_H */
138