1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 *  Shared Memory Communications Direct over loopback-ism device.
 4 *
 5 *  SMC-D loopback-ism device structure definitions.
 6 *
 7 *  Copyright (c) 2024, Alibaba Inc.
 8 *
 9 *  Author: Wen Gu <guwen@linux.alibaba.com>
10 *          Tony Lu <tonylu@linux.alibaba.com>
11 *
12 */
13
14#ifndef _SMC_LOOPBACK_H
15#define _SMC_LOOPBACK_H
16
17#include <linux/device.h>
18#include <net/smc.h>
19
20#if IS_ENABLED(CONFIG_SMC_LO)
21#define SMC_LO_MAX_DMBS		5000
22#define SMC_LO_DMBS_HASH_BITS	12
23#define SMC_LO_RESERVED_CHID	0xFFFF
24
25struct smc_lo_dmb_node {
26	struct hlist_node list;
27	u64 token;
28	u32 len;
29	u32 sba_idx;
30	void *cpu_addr;
31	dma_addr_t dma_addr;
32	refcount_t refcnt;
33};
34
35struct smc_lo_dev {
36	struct smcd_dev *smcd;
37	struct device dev;
38	u16 chid;
39	struct smcd_gid local_gid;
40	atomic_t dmb_cnt;
41	rwlock_t dmb_ht_lock;
42	DECLARE_BITMAP(sba_idx_mask, SMC_LO_MAX_DMBS);
43	DECLARE_HASHTABLE(dmb_ht, SMC_LO_DMBS_HASH_BITS);
44	wait_queue_head_t ldev_release;
45};
46
47int smc_loopback_init(void);
48void smc_loopback_exit(void);
49#else
50static inline int smc_loopback_init(void)
51{
52	return 0;
53}
54
55static inline void smc_loopback_exit(void)
56{
57}
58#endif
59
60#endif /* _SMC_LOOPBACK_H */