1 files changed, 102 insertions, 0 deletions
diff --git a/include/rdma/rdma_netlink.h b/include/rdma/rdma_netlink.h
new file mode 100644
index 000000000..36cdc17de
--- /dev/null
+++ b/include/rdma/rdma_netlink.h
@@ -0,0 +1,102 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _RDMA_NETLINK_H
+#define _RDMA_NETLINK_H
+
+
+#include <linux/netlink.h>
+#include <uapi/rdma/rdma_netlink.h>
+
+struct rdma_nl_cbs {
+	int (*doit)(struct sk_buff *skb, struct nlmsghdr *nlh,
+		    struct netlink_ext_ack *extack);
+	int (*dump)(struct sk_buff *skb, struct netlink_callback *nlcb);
+	u8 flags;
+};
+
+enum rdma_nl_flags {
+	/* Require CAP_NET_ADMIN */
+	RDMA_NL_ADMIN_PERM	= 1 << 0,
+};
+
+/* Define this module as providing netlink services for NETLINK_RDMA, with
+ * index _index.  Since the client indexes were setup in a uapi header as an
+ * enum and we do no want to change that, the user must supply the expanded
+ * constant as well and the compiler checks they are the same.
+ */
+#define MODULE_ALIAS_RDMA_NETLINK(_index, _val)                                \
+	static inline void __maybe_unused __chk_##_index(void)                 \
+	{                                                                      \
+		BUILD_BUG_ON(_index != _val);                                  \
+	}                                                                      \
+	MODULE_ALIAS("rdma-netlink-subsys-" __stringify(_val))
+
+/**
+ * Register client in RDMA netlink.
+ * @index: Index of the added client
+ * @cb_table: A table for op->callback
+ */
+void rdma_nl_register(unsigned int index,
+		      const struct rdma_nl_cbs cb_table[]);
+
+/**
+ * Remove a client from IB netlink.
+ * @index: Index of the removed IB client.
+ */
+void rdma_nl_unregister(unsigned int index);
+
+/**
+ * Put a new message in a supplied skb.
+ * @skb: The netlink skb.
+ * @nlh: Pointer to put the header of the new netlink message.
+ * @seq: The message sequence number.
+ * @len: The requested message length to allocate.
+ * @client: Calling IB netlink client.
+ * @op: message content op.
+ * Returns the allocated buffer on success and NULL on failure.
+ */
+void *ibnl_put_msg(struct sk_buff *skb, struct nlmsghdr **nlh, int seq,
+		   int len, int client, int op, int flags);
+/**
+ * Put a new attribute in a supplied skb.
+ * @skb: The netlink skb.
+ * @nlh: Header of the netlink message to append the attribute to.
+ * @len: The length of the attribute data.
+ * @data: The attribute data to put.
+ * @type: The attribute type.
+ * Returns the 0 and a negative error code on failure.
+ */
+int ibnl_put_attr(struct sk_buff *skb, struct nlmsghdr *nlh,
+		  int len, void *data, int type);
+
+/**
+ * Send the supplied skb to a specific userspace PID.
+ * @skb: The netlink skb
+ * @pid: Userspace netlink process ID
+ * Returns 0 on success or a negative error code.
+ */
+int rdma_nl_unicast(struct sk_buff *skb, u32 pid);
+
+/**
+ * Send, with wait/1 retry, the supplied skb to a specific userspace PID.
+ * @skb: The netlink skb
+ * @pid: Userspace netlink process ID
+ * Returns 0 on success or a negative error code.
+ */
+int rdma_nl_unicast_wait(struct sk_buff *skb, __u32 pid);
+
+/**
+ * Send the supplied skb to a netlink group.
+ * @skb: The netlink skb
+ * @group: Netlink group ID
+ * @flags: allocation flags
+ * Returns 0 on success or a negative error code.
+ */
+int rdma_nl_multicast(struct sk_buff *skb, unsigned int group, gfp_t flags);
+
+/**
+ * Check if there are any listeners to the netlink group
+ * @group: the netlink group ID
+ * Returns 0 on success or a negative for no listeners.
+ */
+int rdma_nl_chk_listeners(unsigned int group);
+#endif /* _RDMA_NETLINK_H */