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 */