xref: /openbmc/linux/include/net/smc.h (revision f947568e)
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 int smc_hash_sk(struct sock *sk);
30 void smc_unhash_sk(struct sock *sk);
31 
32 /* SMCD/ISM device driver interface */
33 struct smcd_dmb {
34 	u64 dmb_tok;
35 	u64 rgid;
36 	u32 dmb_len;
37 	u32 sba_idx;
38 	u32 vlan_valid;
39 	u32 vlan_id;
40 	void *cpu_addr;
41 	dma_addr_t dma_addr;
42 };
43 
44 #define ISM_EVENT_DMB	0
45 #define ISM_EVENT_GID	1
46 #define ISM_EVENT_SWR	2
47 
48 #define ISM_RESERVED_VLANID	0x1FFF
49 
50 #define ISM_ERROR	0xFFFF
51 
52 struct smcd_dev;
53 struct ism_client;
54 
55 struct smcd_ops {
56 	int (*query_remote_gid)(struct smcd_dev *dev, u64 rgid, u32 vid_valid,
57 				u32 vid);
58 	int (*register_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb,
59 			    struct ism_client *client);
60 	int (*unregister_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb);
61 	int (*add_vlan_id)(struct smcd_dev *dev, u64 vlan_id);
62 	int (*del_vlan_id)(struct smcd_dev *dev, u64 vlan_id);
63 	int (*set_vlan_required)(struct smcd_dev *dev);
64 	int (*reset_vlan_required)(struct smcd_dev *dev);
65 	int (*signal_event)(struct smcd_dev *dev, u64 rgid, u32 trigger_irq,
66 			    u32 event_code, u64 info);
67 	int (*move_data)(struct smcd_dev *dev, u64 dmb_tok, unsigned int idx,
68 			 bool sf, unsigned int offset, void *data,
69 			 unsigned int size);
70 	int (*supports_v2)(void);
71 	u8* (*get_system_eid)(void);
72 	u64 (*get_local_gid)(struct smcd_dev *dev);
73 	u16 (*get_chid)(struct smcd_dev *dev);
74 	struct device* (*get_dev)(struct smcd_dev *dev);
75 };
76 
77 struct smcd_dev {
78 	const struct smcd_ops *ops;
79 	void *priv;
80 	struct list_head list;
81 	spinlock_t lock;
82 	struct smc_connection **conn;
83 	struct list_head vlan;
84 	struct workqueue_struct *event_wq;
85 	u8 pnetid[SMC_MAX_PNETID_LEN];
86 	bool pnetid_by_user;
87 	struct list_head lgr_list;
88 	spinlock_t lgr_lock;
89 	atomic_t lgr_cnt;
90 	wait_queue_head_t lgrs_deleted;
91 	u8 going_away : 1;
92 };
93 
94 #endif	/* _SMC_H */
95