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 
16 struct smc_hashinfo {
17 	rwlock_t lock;
18 	struct hlist_head ht;
19 };
20 
21 int smc_hash_sk(struct sock *sk);
22 void smc_unhash_sk(struct sock *sk);
23 
24 /* SMCD/ISM device driver interface */
25 struct 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 struct smcd_event {
41 	u32 type;
42 	u32 code;
43 	u64 tok;
44 	u64 time;
45 	u64 info;
46 };
47 
48 struct smcd_dev;
49 
50 struct 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 
66 struct 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 };
78 
79 struct smcd_dev *smcd_alloc_dev(struct device *parent, const char *name,
80 				const struct smcd_ops *ops, int max_dmbs);
81 int smcd_register_dev(struct smcd_dev *smcd);
82 void smcd_unregister_dev(struct smcd_dev *smcd);
83 void smcd_free_dev(struct smcd_dev *smcd);
84 void smcd_handle_event(struct smcd_dev *dev, struct smcd_event *event);
85 void smcd_handle_irq(struct smcd_dev *dev, unsigned int bit);
86 #endif	/* _SMC_H */
87