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#include <gran/torus3d/node.h>
struct reg {
struct packet pkt;
bool busy;
};
struct port {
struct reg r[2];
};
struct torus3d_node {
struct component component;
uint8_t x, y, z /*, w for 4D but that might be a bit overkill*/;
struct component *x_next, *y_next, *z_next,
*x_prev, *y_prev, *z_prev,
*child;
struct port port_x, port_y, port_z;
struct reg x_in, y_in, z_in, child_in;
bool prio;
};
static stat port_receive(struct torus3d_node *torus3d, struct port *port, struct reg *reg)
{
if (!reg->busy)
return OK;
/* source */
uint8_t sx, sy, sz;
addr_torus3d(reg->pkt.from, &sx, &sy, &sz, NULL);
/* dst */
uint8_t dx, dy, dz;
addr_torus3d(reg->pkt.to, &dx, &dy, &dz, NULL);
/* Dally/spiral routing though I'm a bit unsure if this works for 2D/3D
* toruses (1D seems to work, 2D not so much atm) */
int chan = is_set(®->pkt, PACKET_DONE);
if (port->r[chan].busy)
return OK;
printf("(%d, %d, %d) to (%d, %d, %d) via (%d, %d, %d) c %d\n",
sx, sy, sz,
dx, dy, dz,
torus3d->x, torus3d->y, torus3d->z,
chan);
port->r[chan].pkt = reg->pkt;
port->r[chan].busy = true;
reg->busy = false;
return OK;
}
static stat reg_receive(struct reg *r, struct packet pkt)
{
if (r->busy)
return EBUSY;
r->pkt = pkt;
r->busy = true;
return OK;
}
enum match {
MX = (1 << 0),
MY = (1 << 1),
MZ = (1 << 2),
NX = (1 << 3),
NY = (1 << 4),
NZ = (1 << 5),
};
static void maybe_route_reg(struct torus3d_node *torus3d, struct reg *reg, enum match m, uint64_t *oldest, struct packet **pkt, bool **busy)
{
if (!reg->busy)
return;
uint8_t x, y, z;
addr_torus3d(reg->pkt.to, &x, &y, &z, NULL);
if ((m & MX) && x != torus3d->x)
return;
if ((m & MY) && y != torus3d->y)
return;
if ((m & MZ) && z != torus3d->z)
return;
if ((m & NX) && x == torus3d->x)
return;
if ((m & NY) && y == torus3d->y)
return;
if ((m & NZ) && z == torus3d->z)
return;
if (reg->pkt.timestamp < *oldest) {
*oldest = reg->pkt.timestamp;
*busy = ®->busy;
*pkt = ®->pkt;
}
}
static stat route(struct torus3d_node *torus3d, struct component *next, enum match m)
{
bool prio = torus3d->prio;
uint64_t oldest = -1; struct packet *pkt = NULL; bool *busy = NULL;
/* prioritise current priority port */
maybe_route_reg(torus3d, &torus3d->port_x.r[prio], m, &oldest, &pkt, &busy);
maybe_route_reg(torus3d, &torus3d->port_y.r[prio], m, &oldest, &pkt, &busy);
maybe_route_reg(torus3d, &torus3d->port_z.r[prio], m, &oldest, &pkt, &busy);
/* if no suitable match found, check other ports as well */
if (pkt == NULL) {
maybe_route_reg(torus3d, &torus3d->port_x.r[!prio], m, &oldest, &pkt, &busy);
maybe_route_reg(torus3d, &torus3d->port_y.r[!prio], m, &oldest, &pkt, &busy);
maybe_route_reg(torus3d, &torus3d->port_z.r[!prio], m, &oldest, &pkt, &busy);
}
maybe_route_reg(torus3d, &torus3d->child_in, m, &oldest, &pkt, &busy);
/* no suitable match */
if (pkt == NULL)
return OK;
assert(busy);
stat ret = SEND(torus3d, next, *pkt);
if (ret == EBUSY)
return OK;
*busy = false;
return OK;
}
static stat torus3d_clock(struct torus3d_node *torus3d)
{
torus3d->prio = !torus3d->prio;
stat ret = OK;
if ((ret = port_receive(torus3d, &torus3d->port_x, &torus3d->x_in)))
return ret;
if ((ret = port_receive(torus3d, &torus3d->port_y, &torus3d->y_in)))
return ret;
if ((ret = port_receive(torus3d, &torus3d->port_z, &torus3d->z_in)))
return ret;
if ((ret = route(torus3d, torus3d->x_next, NX)))
return ret;
if ((ret = route(torus3d, torus3d->y_next, NY | MX)))
return ret;
if ((ret = route(torus3d, torus3d->z_next, NZ | MX | MY)))
return ret;
if ((ret = route(torus3d, torus3d->child, MX | MY | MZ)))
return ret;
return OK;
}
static stat torus3d_receive(struct torus3d_node *torus3d, struct component *from, struct packet pkt)
{
if (from == torus3d->child)
return reg_receive(&torus3d->child_in, pkt);
if (from == torus3d->x_prev)
return reg_receive(&torus3d->x_in, pkt);
if (from == torus3d->y_prev)
return reg_receive(&torus3d->y_in, pkt);
if (from == torus3d->z_prev)
return reg_receive(&torus3d->z_in, pkt);
abort();
return OK;
}
struct component *create_torus3d_node(uint8_t x, uint8_t y, uint8_t z)
{
struct torus3d_node *node = calloc(1, sizeof(struct torus3d_node));
if (!node)
return NULL;
node->component.receive = (receive_callback)torus3d_receive;
node->component.clock = (clock_callback)torus3d_clock;
node->x = x;
node->y = y;
node->z = z;
return (struct component *)node;
}
stat torus3d_node_connect(struct component *node,
struct component *x_in,
struct component *y_in,
struct component *z_in,
struct component *child,
struct component *x_out,
struct component *y_out,
struct component *z_out)
{
struct torus3d_node *n = (struct torus3d_node *)node;
n->x_prev = x_in;
n->y_prev = y_in;
n->z_prev = z_in;
n->child = child;
n->x_next = x_out;
n->y_next = y_out;
n->z_next = z_out;
return OK;
}
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