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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#include <linux/device.h>
15#include <linux/spinlock.h>
16#include <linux/types.h>
17#include <linux/wait.h>
18
19struct sock;
20
21#define SMC_MAX_PNETID_LEN 16 /* Max. length of PNET id */
22
23struct smc_hashinfo {
24 rwlock_t lock;
25 struct hlist_head ht;
26};
27
28int smc_hash_sk(struct sock *sk);
29void smc_unhash_sk(struct sock *sk);
30
31/* SMCD/ISM device driver interface */
32struct smcd_dmb {
33 u64 dmb_tok;
34 u64 rgid;
35 u32 dmb_len;
36 u32 sba_idx;
37 u32 vlan_valid;
38 u32 vlan_id;
39 void *cpu_addr;
40 dma_addr_t dma_addr;
41};
42
43#define ISM_EVENT_DMB 0
44#define ISM_EVENT_GID 1
45#define ISM_EVENT_SWR 2
46
47#define ISM_RESERVED_VLANID 0x1FFF
48
49#define ISM_ERROR 0xFFFF
50
51struct smcd_event {
52 u32 type;
53 u32 code;
54 u64 tok;
55 u64 time;
56 u64 info;
57};
58
59struct smcd_dev;
60
61struct smcd_ops {
62 int (*query_remote_gid)(struct smcd_dev *dev, u64 rgid, u32 vid_valid,
63 u32 vid);
64 int (*register_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb);
65 int (*unregister_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb);
66 int (*add_vlan_id)(struct smcd_dev *dev, u64 vlan_id);
67 int (*del_vlan_id)(struct smcd_dev *dev, u64 vlan_id);
68 int (*set_vlan_required)(struct smcd_dev *dev);
69 int (*reset_vlan_required)(struct smcd_dev *dev);
70 int (*signal_event)(struct smcd_dev *dev, u64 rgid, u32 trigger_irq,
71 u32 event_code, u64 info);
72 int (*move_data)(struct smcd_dev *dev, u64 dmb_tok, unsigned int idx,
73 bool sf, unsigned int offset, void *data,
74 unsigned int size);
75 u8* (*get_system_eid)(void);
76 u16 (*get_chid)(struct smcd_dev *dev);
77};
78
79struct smcd_dev {
80 const struct smcd_ops *ops;
81 struct device dev;
82 void *priv;
83 u64 local_gid;
84 struct list_head list;
85 spinlock_t lock;
86 struct smc_connection **conn;
87 struct list_head vlan;
88 struct workqueue_struct *event_wq;
89 u8 pnetid[SMC_MAX_PNETID_LEN];
90 bool pnetid_by_user;
91 struct list_head lgr_list;
92 spinlock_t lgr_lock;
93 atomic_t lgr_cnt;
94 wait_queue_head_t lgrs_deleted;
95 u8 going_away : 1;
96};
97
98struct smcd_dev *smcd_alloc_dev(struct device *parent, const char *name,
99 const struct smcd_ops *ops, int max_dmbs);
100int smcd_register_dev(struct smcd_dev *smcd);
101void smcd_unregister_dev(struct smcd_dev *smcd);
102void smcd_free_dev(struct smcd_dev *smcd);
103void smcd_handle_event(struct smcd_dev *dev, struct smcd_event *event);
104void smcd_handle_irq(struct smcd_dev *dev, unsigned int bit, u16 dmbemask);
105#endif /* _SMC_H */