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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 <[email protected]>
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 #include "linux/ism.h"
19
20 struct sock;
21
22 #define SMC_MAX_PNETID_LEN      16      /* Max. length of PNET id */
23
24 struct smc_hashinfo {
25         rwlock_t lock;
26         struct hlist_head ht;
27 };
28
29 /* SMCD/ISM device driver interface */
30 struct smcd_dmb {
31         u64 dmb_tok;
32         u64 rgid;
33         u32 dmb_len;
34         u32 sba_idx;
35         u32 vlan_valid;
36         u32 vlan_id;
37         void *cpu_addr;
38         dma_addr_t dma_addr;
39 };
40
41 #define ISM_EVENT_DMB   0
42 #define ISM_EVENT_GID   1
43 #define ISM_EVENT_SWR   2
44
45 #define ISM_RESERVED_VLANID     0x1FFF
46
47 #define ISM_ERROR       0xFFFF
48
49 struct smcd_dev;
50
51 struct smcd_gid {
52         u64     gid;
53         u64     gid_ext;
54 };
55
56 struct smcd_ops {
57         int (*query_remote_gid)(struct smcd_dev *dev, struct smcd_gid *rgid,
58                                 u32 vid_valid, u32 vid);
59         int (*register_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb,
60                             void *client);
61         int (*unregister_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb);
62         int (*move_data)(struct smcd_dev *dev, u64 dmb_tok, unsigned int idx,
63                          bool sf, unsigned int offset, void *data,
64                          unsigned int size);
65         int (*supports_v2)(void);
66         void (*get_local_gid)(struct smcd_dev *dev, struct smcd_gid *gid);
67         u16 (*get_chid)(struct smcd_dev *dev);
68         struct device* (*get_dev)(struct smcd_dev *dev);
69
70         /* optional operations */
71         int (*add_vlan_id)(struct smcd_dev *dev, u64 vlan_id);
72         int (*del_vlan_id)(struct smcd_dev *dev, u64 vlan_id);
73         int (*set_vlan_required)(struct smcd_dev *dev);
74         int (*reset_vlan_required)(struct smcd_dev *dev);
75         int (*signal_event)(struct smcd_dev *dev, struct smcd_gid *rgid,
76                             u32 trigger_irq, u32 event_code, u64 info);
77         int (*support_dmb_nocopy)(struct smcd_dev *dev);
78         int (*attach_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb);
79         int (*detach_dmb)(struct smcd_dev *dev, u64 token);
80 };
81
82 struct smcd_dev {
83         const struct smcd_ops *ops;
84         void *priv;
85         void *client;
86         struct list_head list;
87         spinlock_t lock;
88         struct smc_connection **conn;
89         struct list_head vlan;
90         struct workqueue_struct *event_wq;
91         u8 pnetid[SMC_MAX_PNETID_LEN];
92         bool pnetid_by_user;
93         struct list_head lgr_list;
94         spinlock_t lgr_lock;
95         atomic_t lgr_cnt;
96         wait_queue_head_t lgrs_deleted;
97         u8 going_away : 1;
98 };
99
100 #endif  /* _SMC_H */
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