tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * ramster.h
3 *
4 * Peer-to-peer transcendent memory
5 *
6 * Copyright (c) 2009-2012, Dan Magenheimer, Oracle Corp.
7 */
8
9#ifndef _RAMSTER_H_
10#define _RAMSTER_H_
11
12/*
13 * format of remote pampd:
14 * bit 0 == intransit
15 * bit 1 == is_remote... if this bit is set, then
16 * bit 2-9 == remotenode
17 * bit 10-22 == size
18 * bit 23-30 == cksum
19 */
20#define FAKE_PAMPD_INTRANSIT_BITS 1
21#define FAKE_PAMPD_ISREMOTE_BITS 1
22#define FAKE_PAMPD_REMOTENODE_BITS 8
23#define FAKE_PAMPD_REMOTESIZE_BITS 13
24#define FAKE_PAMPD_CHECKSUM_BITS 8
25
26#define FAKE_PAMPD_INTRANSIT_SHIFT 0
27#define FAKE_PAMPD_ISREMOTE_SHIFT (FAKE_PAMPD_INTRANSIT_SHIFT + \
28 FAKE_PAMPD_INTRANSIT_BITS)
29#define FAKE_PAMPD_REMOTENODE_SHIFT (FAKE_PAMPD_ISREMOTE_SHIFT + \
30 FAKE_PAMPD_ISREMOTE_BITS)
31#define FAKE_PAMPD_REMOTESIZE_SHIFT (FAKE_PAMPD_REMOTENODE_SHIFT + \
32 FAKE_PAMPD_REMOTENODE_BITS)
33#define FAKE_PAMPD_CHECKSUM_SHIFT (FAKE_PAMPD_REMOTESIZE_SHIFT + \
34 FAKE_PAMPD_REMOTESIZE_BITS)
35
36#define FAKE_PAMPD_MASK(x) ((1UL << (x)) - 1)
37
38static inline void *pampd_make_remote(int remotenode, size_t size,
39 unsigned char cksum)
40{
41 unsigned long fake_pampd = 0;
42 fake_pampd |= 1UL << FAKE_PAMPD_ISREMOTE_SHIFT;
43 fake_pampd |= ((unsigned long)remotenode &
44 FAKE_PAMPD_MASK(FAKE_PAMPD_REMOTENODE_BITS)) <<
45 FAKE_PAMPD_REMOTENODE_SHIFT;
46 fake_pampd |= ((unsigned long)size &
47 FAKE_PAMPD_MASK(FAKE_PAMPD_REMOTESIZE_BITS)) <<
48 FAKE_PAMPD_REMOTESIZE_SHIFT;
49 fake_pampd |= ((unsigned long)cksum &
50 FAKE_PAMPD_MASK(FAKE_PAMPD_CHECKSUM_BITS)) <<
51 FAKE_PAMPD_CHECKSUM_SHIFT;
52 return (void *)fake_pampd;
53}
54
55static inline unsigned int pampd_remote_node(void *pampd)
56{
57 unsigned long fake_pampd = (unsigned long)pampd;
58 return (fake_pampd >> FAKE_PAMPD_REMOTENODE_SHIFT) &
59 FAKE_PAMPD_MASK(FAKE_PAMPD_REMOTENODE_BITS);
60}
61
62static inline unsigned int pampd_remote_size(void *pampd)
63{
64 unsigned long fake_pampd = (unsigned long)pampd;
65 return (fake_pampd >> FAKE_PAMPD_REMOTESIZE_SHIFT) &
66 FAKE_PAMPD_MASK(FAKE_PAMPD_REMOTESIZE_BITS);
67}
68
69static inline unsigned char pampd_remote_cksum(void *pampd)
70{
71 unsigned long fake_pampd = (unsigned long)pampd;
72 return (fake_pampd >> FAKE_PAMPD_CHECKSUM_SHIFT) &
73 FAKE_PAMPD_MASK(FAKE_PAMPD_CHECKSUM_BITS);
74}
75
76static inline bool pampd_is_remote(void *pampd)
77{
78 unsigned long fake_pampd = (unsigned long)pampd;
79 return (fake_pampd >> FAKE_PAMPD_ISREMOTE_SHIFT) &
80 FAKE_PAMPD_MASK(FAKE_PAMPD_ISREMOTE_BITS);
81}
82
83static inline bool pampd_is_intransit(void *pampd)
84{
85 unsigned long fake_pampd = (unsigned long)pampd;
86 return (fake_pampd >> FAKE_PAMPD_INTRANSIT_SHIFT) &
87 FAKE_PAMPD_MASK(FAKE_PAMPD_INTRANSIT_BITS);
88}
89
90/* note that it is a BUG for intransit to be set without isremote also set */
91static inline void *pampd_mark_intransit(void *pampd)
92{
93 unsigned long fake_pampd = (unsigned long)pampd;
94
95 fake_pampd |= 1UL << FAKE_PAMPD_ISREMOTE_SHIFT;
96 fake_pampd |= 1UL << FAKE_PAMPD_INTRANSIT_SHIFT;
97 return (void *)fake_pampd;
98}
99
100static inline void *pampd_mask_intransit_and_remote(void *marked_pampd)
101{
102 unsigned long pampd = (unsigned long)marked_pampd;
103
104 pampd &= ~(1UL << FAKE_PAMPD_INTRANSIT_SHIFT);
105 pampd &= ~(1UL << FAKE_PAMPD_ISREMOTE_SHIFT);
106 return (void *)pampd;
107}
108
109extern int ramster_remote_async_get(struct tmem_xhandle *,
110 bool, int, size_t, uint8_t, void *extra);
111extern int ramster_remote_put(struct tmem_xhandle *, char *, size_t,
112 bool, int *);
113extern int ramster_remote_flush(struct tmem_xhandle *, int);
114extern int ramster_remote_flush_object(struct tmem_xhandle *, int);
115extern int r2net_register_handlers(void);
116extern int r2net_remote_target_node_set(int);
117
118#endif /* _TMEM_H */