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 #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 */
101
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