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
pampd_make_remote(int remotenode,size_t size,unsigned char cksum)38 static 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
pampd_remote_node(void * pampd)55 static 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
pampd_remote_size(void * pampd)62 static 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
pampd_remote_cksum(void * pampd)69 static 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
pampd_is_remote(void * pampd)76 static 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
pampd_is_intransit(void * pampd)83 static 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 */
pampd_mark_intransit(void * pampd)91 static 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
pampd_mask_intransit_and_remote(void * marked_pampd)100 static 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
109 extern int ramster_remote_async_get(struct tmem_xhandle *,
110 bool, int, size_t, uint8_t, void *extra);
111 extern int ramster_remote_put(struct tmem_xhandle *, char *, size_t,
112 bool, int *);
113 extern int ramster_remote_flush(struct tmem_xhandle *, int);
114 extern int ramster_remote_flush_object(struct tmem_xhandle *, int);
115 extern int r2net_register_handlers(void);
116 extern int r2net_remote_target_node_set(int);
117
118 #endif /* _TMEM_H */
119