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
40#define ISM_ERROR	0xFFFF
41
42struct smcd_event {
43	u32 type;
44	u32 code;
45	u64 tok;
46	u64 time;
47	u64 info;
48};
49
50struct smcd_dev;
51
52struct smcd_ops {
53	int (*query_remote_gid)(struct smcd_dev *dev, u64 rgid, u32 vid_valid,
54				u32 vid);
55	int (*register_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb);
56	int (*unregister_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb);
57	int (*add_vlan_id)(struct smcd_dev *dev, u64 vlan_id);
58	int (*del_vlan_id)(struct smcd_dev *dev, u64 vlan_id);
59	int (*set_vlan_required)(struct smcd_dev *dev);
60	int (*reset_vlan_required)(struct smcd_dev *dev);
61	int (*signal_event)(struct smcd_dev *dev, u64 rgid, u32 trigger_irq,
62			    u32 event_code, u64 info);
63	int (*move_data)(struct smcd_dev *dev, u64 dmb_tok, unsigned int idx,
64			 bool sf, unsigned int offset, void *data,
65			 unsigned int size);
66};
67
68struct smcd_dev {
69	const struct smcd_ops *ops;
70	struct device dev;
71	void *priv;
72	u64 local_gid;
73	struct list_head list;
74	spinlock_t lock;
75	struct smc_connection **conn;
76	struct list_head vlan;
77	struct workqueue_struct *event_wq;
78	u8 pnetid[SMC_MAX_PNETID_LEN];
79	bool pnetid_by_user;
80	struct list_head lgr_list;
81	spinlock_t lgr_lock;
82	atomic_t lgr_cnt;
83	wait_queue_head_t lgrs_deleted;
84	u8 going_away : 1;
85};
86
87struct smcd_dev *smcd_alloc_dev(struct device *parent, const char *name,
88				const struct smcd_ops *ops, int max_dmbs);
89int smcd_register_dev(struct smcd_dev *smcd);
90void smcd_unregister_dev(struct smcd_dev *smcd);
91void smcd_free_dev(struct smcd_dev *smcd);
92void smcd_handle_event(struct smcd_dev *dev, struct smcd_event *event);
93void smcd_handle_irq(struct smcd_dev *dev, unsigned int bit);
94#endif	/* _SMC_H */