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Diffstat (limited to 'include/rdma/rdma_netlink.h')
| -rw-r--r-- | include/rdma/rdma_netlink.h | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/include/rdma/rdma_netlink.h b/include/rdma/rdma_netlink.h new file mode 100644 index 0000000000..c2a79aeee1 --- /dev/null +++ b/include/rdma/rdma_netlink.h @@ -0,0 +1,125 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef _RDMA_NETLINK_H +#define _RDMA_NETLINK_H + +#include <linux/netlink.h> +#include <uapi/rdma/rdma_netlink.h> + +enum { + RDMA_NLDEV_ATTR_EMPTY_STRING = 1, + RDMA_NLDEV_ATTR_ENTRY_STRLEN = 16, + RDMA_NLDEV_ATTR_CHARDEV_TYPE_SIZE = 32, +}; + +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. + * @net: Net namespace in which to send the skb + * @skb: The netlink skb + * @pid: Userspace netlink process ID + * Returns 0 on success or a negative error code. + */ +int rdma_nl_unicast(struct net *net, struct sk_buff *skb, u32 pid); + +/** + * Send, with wait/1 retry, the supplied skb to a specific userspace PID. + * @net: Net namespace in which to send the skb + * @skb: The netlink skb + * @pid: Userspace netlink process ID + * Returns 0 on success or a negative error code. + */ +int rdma_nl_unicast_wait(struct net *net, struct sk_buff *skb, __u32 pid); + +/** + * Send the supplied skb to a netlink group. + * @net: Net namespace in which to send the skb + * @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 net *net, 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 true on success or false if no listeners. + */ +bool rdma_nl_chk_listeners(unsigned int group); + +struct rdma_link_ops { + struct list_head list; + const char *type; + int (*newlink)(const char *ibdev_name, struct net_device *ndev); +}; + +void rdma_link_register(struct rdma_link_ops *ops); +void rdma_link_unregister(struct rdma_link_ops *ops); + +#define MODULE_ALIAS_RDMA_LINK(type) MODULE_ALIAS("rdma-link-" type) +#define MODULE_ALIAS_RDMA_CLIENT(type) MODULE_ALIAS("rdma-client-" type) + +#endif /* _RDMA_NETLINK_H */ |