1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
#include <gran/grid/node3d.h>
struct reg {
struct packet pkt;
bool busy;
};
struct node3d {
struct component component;
uint8_t x, y, z;
uint64_t timestamp;
struct component *n, *s, *w, *e, *u, *d, *l;
struct reg n_in, s_in, w_in, e_in, u_in, d_in, l_in;
};
static stat reg_receive(struct reg *r, struct packet pkt)
{
if (r->busy)
return EBUSY;
r->pkt = pkt;
r->busy = true;
return OK;
}
/* LX = node.x > pkt.x, etc */
enum match {
LX = (1 << 0),
LY = (1 << 1),
LZ = (1 << 2),
GX = (1 << 3),
GY = (1 << 4),
GZ = (1 << 5),
NX = (1 << 6),
NY = (1 << 7),
NZ = (1 << 8),
};
static void maybe_route_reg(struct node3d *node3d, struct reg *reg, enum match m, uint64_t *oldest, struct packet **pkt, bool **busy)
{
if (!reg->busy)
return;
uint8_t x, y, z;
addr_grid3d(reg->pkt.to, &x, &y, &z, NULL);
if ((m & LX) && x < node3d->x)
return;
if ((m & LY) && y < node3d->y)
return;
if ((m & LZ) && z < node3d->z)
return;
if ((m & GX) && x > node3d->x)
return;
if ((m & GY) && y > node3d->y)
return;
if ((m & GZ) && z > node3d->z)
return;
if ((m & NX) && x == node3d->x)
return;
if ((m & NY) && y == node3d->y)
return;
if ((m & NZ) && z == node3d->z)
return;
if (reg->pkt.timestamp < *oldest) {
*oldest = reg->pkt.timestamp;
*busy = ®->busy;
*pkt = ®->pkt;
}
}
static stat route(struct node3d *node3d, struct component *next, enum match m)
{
uint64_t oldest = -1; struct packet *pkt = NULL; bool *busy = NULL;
maybe_route_reg(node3d, &node3d->l_in, m, &oldest, &pkt, &busy);
maybe_route_reg(node3d, &node3d->n_in, m, &oldest, &pkt, &busy);
maybe_route_reg(node3d, &node3d->s_in, m, &oldest, &pkt, &busy);
maybe_route_reg(node3d, &node3d->e_in, m, &oldest, &pkt, &busy);
maybe_route_reg(node3d, &node3d->w_in, m, &oldest, &pkt, &busy);
maybe_route_reg(node3d, &node3d->u_in, m, &oldest, &pkt, &busy);
maybe_route_reg(node3d, &node3d->d_in, m, &oldest, &pkt, &busy);
/* no suitable match */
if (pkt == NULL)
return OK;
assert(busy);
if (!next) {
abort(); /* for now, eventually should probably return to sender */
return OK;
}
stat ret = SEND(node3d, next, *pkt);
if (ret == EBUSY)
return OK;
*busy = false;
return OK;
}
static stat node3d_clock(struct node3d *node3d)
{
node3d->timestamp++;
stat ret = OK;
if ((ret = route(node3d, node3d->e, LX | NX)))
return ret;
if ((ret = route(node3d, node3d->w, GX | NX)))
return ret;
if ((ret = route(node3d, node3d->n, LX | GX | LY | NY)))
return ret;
if ((ret = route(node3d, node3d->s, LX | GX | GY | NY)))
return ret;
if ((ret = route(node3d, node3d->u, LX | GX | LY | GY | LZ | NZ)))
return ret;
if ((ret = route(node3d, node3d->d, LX | GX | LY | GY | GZ | NZ)))
return ret;
if ((ret = route(node3d, node3d->l, LX | LY | LZ | GX | GY | GZ)))
return ret;
return OK;
}
static stat node3d_receive(struct node3d *node3d, struct component *from, struct packet pkt)
{
if (from == node3d->l) {
/* add time when packet entered network */
pkt.timestamp = node3d->timestamp;
return reg_receive(&node3d->l_in, pkt);
}
if (from == node3d->n)
return reg_receive(&node3d->n_in, pkt);
if (from == node3d->s)
return reg_receive(&node3d->s_in, pkt);
if (from == node3d->w)
return reg_receive(&node3d->w_in, pkt);
if (from == node3d->e)
return reg_receive(&node3d->e_in, pkt);
if (from == node3d->u)
return reg_receive(&node3d->u_in, pkt);
if (from == node3d->d)
return reg_receive(&node3d->d_in, pkt);
abort();
return OK;
}
struct component *create_grid_node3d(uint8_t x, uint8_t y, uint8_t z)
{
struct node3d *node = calloc(1, sizeof(struct node3d));
if (!node)
return NULL;
node->component.receive = (receive_callback)node3d_receive;
node->component.clock = (clock_callback)node3d_clock;
node->x = x;
node->y = y;
node->z = z;
return (struct component *)node;
}
stat grid_node3d_connect(struct component *node,
struct component *n,
struct component *s,
struct component *w,
struct component *e,
struct component *u,
struct component *d,
struct component *l)
{
struct node3d *node3d = (struct node3d *)node;
node3d->n = n;
node3d->s = s;
node3d->w = w;
node3d->e = e;
node3d->u = u;
node3d->d = d;
node3d->l = l;
return OK;
}
|
