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This patch adds a function to check if listeners for a netlink multicast group are present. It also adds a function to receive netlink response messages. Signed-off-by: Kaike Wan <kaike.wan@intel.com> Signed-off-by: John Fleck <john.fleck@intel.com> Signed-off-by: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
#ifndef _RDMA_NETLINK_H
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#define _RDMA_NETLINK_H
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#include <linux/netlink.h>
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#include <uapi/rdma/rdma_netlink.h>
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struct ibnl_client_cbs {
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int (*dump)(struct sk_buff *skb, struct netlink_callback *nlcb);
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struct module *module;
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};
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int ibnl_init(void);
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void ibnl_cleanup(void);
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/**
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* Add a a client to the list of IB netlink exporters.
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* @index: Index of the added client
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* @nops: Number of supported ops by the added client.
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* @cb_table: A table for op->callback
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*
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* Returns 0 on success or a negative error code.
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*/
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int ibnl_add_client(int index, int nops,
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const struct ibnl_client_cbs cb_table[]);
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/**
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* Remove a client from IB netlink.
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* @index: Index of the removed IB client.
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*
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* Returns 0 on success or a negative error code.
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*/
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int ibnl_remove_client(int index);
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/**
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* Put a new message in a supplied skb.
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* @skb: The netlink skb.
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* @nlh: Pointer to put the header of the new netlink message.
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* @seq: The message sequence number.
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* @len: The requested message length to allocate.
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* @client: Calling IB netlink client.
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* @op: message content op.
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* Returns the allocated buffer on success and NULL on failure.
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*/
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void *ibnl_put_msg(struct sk_buff *skb, struct nlmsghdr **nlh, int seq,
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int len, int client, int op, int flags);
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/**
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* Put a new attribute in a supplied skb.
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* @skb: The netlink skb.
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* @nlh: Header of the netlink message to append the attribute to.
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* @len: The length of the attribute data.
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* @data: The attribute data to put.
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* @type: The attribute type.
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* Returns the 0 and a negative error code on failure.
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*/
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int ibnl_put_attr(struct sk_buff *skb, struct nlmsghdr *nlh,
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int len, void *data, int type);
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/**
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* Send the supplied skb to a specific userspace PID.
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* @skb: The netlink skb
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* @nlh: Header of the netlink message to send
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* @pid: Userspace netlink process ID
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* Returns 0 on success or a negative error code.
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*/
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int ibnl_unicast(struct sk_buff *skb, struct nlmsghdr *nlh,
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__u32 pid);
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/**
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* Send the supplied skb to a netlink group.
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* @skb: The netlink skb
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* @nlh: Header of the netlink message to send
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* @group: Netlink group ID
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* @flags: allocation flags
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* Returns 0 on success or a negative error code.
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*/
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int ibnl_multicast(struct sk_buff *skb, struct nlmsghdr *nlh,
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unsigned int group, gfp_t flags);
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/**
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* Check if there are any listeners to the netlink group
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* @group: the netlink group ID
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* Returns 0 on success or a negative for no listeners.
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*/
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int ibnl_chk_listeners(unsigned int group);
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#endif /* _RDMA_NETLINK_H */
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