1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 *  Shared Memory Communications over RDMA (SMC-R) and RoCE
 4 *
 5 *  Definitions for the SMC module (socket related)
 6 *
 7 *  Copyright IBM Corp. 2016
 8 *
 9 *  Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
10 */
11#ifndef _SMC_H
12#define _SMC_H
13
14#define SMC_MAX_PNETID_LEN	16	/* Max. length of PNET id */
15
16struct smc_hashinfo {
17	rwlock_t lock;
18	struct hlist_head ht;
19};
20
21int smc_hash_sk(struct sock *sk);
22void smc_unhash_sk(struct sock *sk);
23
24/* SMCD/ISM device driver interface */
25struct smcd_dmb {
26	u64 dmb_tok;
27	u64 rgid;
28	u32 dmb_len;
29	u32 sba_idx;
30	u32 vlan_valid;
31	u32 vlan_id;
32	void *cpu_addr;
33	dma_addr_t dma_addr;
34};
35
36#define ISM_EVENT_DMB	0
37#define ISM_EVENT_GID	1
38#define ISM_EVENT_SWR	2
39
40struct smcd_event {
41	u32 type;
42	u32 code;
43	u64 tok;
44	u64 time;
45	u64 info;
46};
47
48struct smcd_dev;
49
50struct smcd_ops {
51	int (*query_remote_gid)(struct smcd_dev *dev, u64 rgid, u32 vid_valid,
52				u32 vid);
53	int (*register_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb);
54	int (*unregister_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb);
55	int (*add_vlan_id)(struct smcd_dev *dev, u64 vlan_id);
56	int (*del_vlan_id)(struct smcd_dev *dev, u64 vlan_id);
57	int (*set_vlan_required)(struct smcd_dev *dev);
58	int (*reset_vlan_required)(struct smcd_dev *dev);
59	int (*signal_event)(struct smcd_dev *dev, u64 rgid, u32 trigger_irq,
60			    u32 event_code, u64 info);
61	int (*move_data)(struct smcd_dev *dev, u64 dmb_tok, unsigned int idx,
62			 bool sf, unsigned int offset, void *data,
63			 unsigned int size);
64};
65
66struct smcd_dev {
67	const struct smcd_ops *ops;
68	struct device dev;
69	void *priv;
70	u64 local_gid;
71	struct list_head list;
72	spinlock_t lock;
73	struct smc_connection **conn;
74	struct list_head vlan;
75	struct workqueue_struct *event_wq;
76	u8 pnetid[SMC_MAX_PNETID_LEN];
77	bool pnetid_by_user;
78};
79
80struct smcd_dev *smcd_alloc_dev(struct device *parent, const char *name,
81				const struct smcd_ops *ops, int max_dmbs);
82int smcd_register_dev(struct smcd_dev *smcd);
83void smcd_unregister_dev(struct smcd_dev *smcd);
84void smcd_free_dev(struct smcd_dev *smcd);
85void smcd_handle_event(struct smcd_dev *dev, struct smcd_event *event);
86void smcd_handle_irq(struct smcd_dev *dev, unsigned int bit);
87#endif	/* _SMC_H */