mctp.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * MCTP per-net structures
 4 */
 5
 6#ifndef __NETNS_MCTP_H__
 7#define __NETNS_MCTP_H__
 8
 9#include <linux/hash.h>
10#include <linux/hashtable.h>
11#include <linux/mutex.h>
12#include <linux/types.h>
13
14#define MCTP_BINDS_BITS 7
15
16struct netns_mctp {
17	/* Only updated under RTNL, entries freed via RCU */
18	struct list_head routes;
19
20	/* Bound sockets: hash table of sockets, keyed by
21	 * (type, src_eid, dest_eid).
22	 * Specific src_eid/dest_eid entries also have an entry for
23	 * MCTP_ADDR_ANY. This list is updated from non-atomic contexts
24	 * (under bind_lock), and read (under rcu) in packet rx.
25	 */
26	struct mutex bind_lock;
27	DECLARE_HASHTABLE(binds, MCTP_BINDS_BITS);
28
29	/* tag allocations. This list is read and updated from atomic contexts,
30	 * but elements are free()ed after a RCU grace-period
31	 */
32	spinlock_t keys_lock;
33	struct hlist_head keys;
34
35	/* MCTP network */
36	unsigned int default_net;
37
38	/* neighbour table */
39	struct mutex neigh_lock;
40	struct list_head neighbours;
41};
42
43static inline u32 mctp_bind_hash(u8 type, u8 local_addr, u8 peer_addr)
44{
45	return hash_32(type | (u32)local_addr << 8 | (u32)peer_addr << 16,
46		       MCTP_BINDS_BITS);
47}
48
49#endif /* __NETNS_MCTP_H__ */