1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Shared Memory Communications over RDMA (SMC-R) and RoCE
 4 *
 5 *  Definitions for IB environment
 6 *
 7 *  Copyright IBM Corp. 2016
 8 *
 9 *  Author(s):  Ursula Braun <Ursula Braun@linux.vnet.ibm.com>
10 */
11
12#ifndef _SMC_IB_H
13#define _SMC_IB_H
14
15#include <linux/interrupt.h>
16#include <linux/if_ether.h>
17#include <rdma/ib_verbs.h>
18
19#define SMC_MAX_PORTS			2	/* Max # of ports */
20#define SMC_GID_SIZE			sizeof(union ib_gid)
21
22#define SMC_IB_MAX_SEND_SGE		2
23
24struct smc_ib_devices {			/* list of smc ib devices definition */
25	struct list_head	list;
26	spinlock_t		lock;	/* protects list of smc ib devices */
27};
28
29extern struct smc_ib_devices	smc_ib_devices; /* list of smc ib devices */
30
31struct smc_ib_device {				/* ib-device infos for smc */
32	struct list_head	list;
33	struct ib_device	*ibdev;
34	struct ib_port_attr	pattr[SMC_MAX_PORTS];	/* ib dev. port attrs */
35	struct ib_event_handler	event_handler;	/* global ib_event handler */
36	struct ib_cq		*roce_cq_send;	/* send completion queue */
37	struct ib_cq		*roce_cq_recv;	/* recv completion queue */
38	struct tasklet_struct	send_tasklet;	/* called by send cq handler */
39	struct tasklet_struct	recv_tasklet;	/* called by recv cq handler */
40	char			mac[SMC_MAX_PORTS][ETH_ALEN];
41						/* mac address per port*/
42	union ib_gid		gid[SMC_MAX_PORTS]; /* gid per port */
43	u8			initialized : 1; /* ib dev CQ, evthdl done */
44	struct work_struct	port_event_work;
45	unsigned long		port_event_mask;
46};
47
48struct smc_buf_desc;
49struct smc_link;
50
51int smc_ib_register_client(void) __init;
52void smc_ib_unregister_client(void);
53bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport);
54int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport);
55int smc_ib_buf_map_sg(struct smc_ib_device *smcibdev,
56		      struct smc_buf_desc *buf_slot,
57		      enum dma_data_direction data_direction);
58void smc_ib_buf_unmap_sg(struct smc_ib_device *smcibdev,
59			 struct smc_buf_desc *buf_slot,
60			 enum dma_data_direction data_direction);
61void smc_ib_dealloc_protection_domain(struct smc_link *lnk);
62int smc_ib_create_protection_domain(struct smc_link *lnk);
63void smc_ib_destroy_queue_pair(struct smc_link *lnk);
64int smc_ib_create_queue_pair(struct smc_link *lnk);
65int smc_ib_ready_link(struct smc_link *lnk);
66int smc_ib_modify_qp_rts(struct smc_link *lnk);
67int smc_ib_modify_qp_reset(struct smc_link *lnk);
68long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev);
69int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags,
70			     struct smc_buf_desc *buf_slot);
71void smc_ib_put_memory_region(struct ib_mr *mr);
72void smc_ib_sync_sg_for_cpu(struct smc_ib_device *smcibdev,
73			    struct smc_buf_desc *buf_slot,
74			    enum dma_data_direction data_direction);
75void smc_ib_sync_sg_for_device(struct smc_ib_device *smcibdev,
76			       struct smc_buf_desc *buf_slot,
77			       enum dma_data_direction data_direction);
78#endif