xref: /openbmc/linux/include/net/smc.h (revision a34a9f1a)
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