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
25 struct 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
35 struct 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
47 int smc_loopback_init(void);
48 void smc_loopback_exit(void);
49 #else
50 static inline int smc_loopback_init(void)
51 {
52 return 0;
53 }
54
55 static inline void smc_loopback_exit(void)
56 {
57 }
58 #endif
59
60 #endif /* _SMC_LOOPBACK_H */
61
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