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Improved multihop/mesh route discovery.

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Packetbuffer is now saved before route discovery and resent when a
route is found.

This solves the following problems:
- First packet sent to a certain node is corrupted.
- Packet to be forwarded that triggers route discovery is lost.
This commit is contained in:
Niko Pollner 2011-08-30 13:31:26 +02:00 committed by nvt
parent 7397e86f9c
commit 84105f4e47
3 changed files with 28 additions and 16 deletions
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26
core/net/rime/mesh.c
View file

@ -94,7 +94,15 @@ data_packet_forward(struct multihop_conn *multihop,
rt = route_lookup(dest);
if(rt == NULL) {
if(c->queued_data != NULL) {
queuebuf_free(c->queued_data);
}
PRINTF("data_packet_forward: queueing data, sending rreq\n");
c->queued_data = queuebuf_new_from_packetbuf();
rimeaddr_copy(&c->queued_data_dest, dest);
route_discovery_discover(&c->route_discovery_conn, dest, PACKET_TIMEOUT);
return NULL;
} else {
route_refresh(rt);
@ -106,15 +114,21 @@ data_packet_forward(struct multihop_conn *multihop,
static void
found_route(struct route_discovery_conn *rdc, const rimeaddr_t *dest)
{
struct route_entry *rt;
struct mesh_conn *c = (struct mesh_conn *)
((char *)rdc - offsetof(struct mesh_conn, route_discovery_conn));
PRINTF("found_route\n");
if(c->queued_data != NULL &&
rimeaddr_cmp(dest, &c->queued_data_dest)) {
queuebuf_to_packetbuf(c->queued_data);
queuebuf_free(c->queued_data);
c->queued_data = NULL;
if(multihop_send(&c->multihop, dest)) {
rt = route_lookup(dest);
if (rt != NULL) {
multihop_resend(&c->multihop, &rt->nexthop);
c->cb->sent(c);
} else {
c->cb->timedout(c);
@ -175,15 +189,7 @@ mesh_send(struct mesh_conn *c, const rimeaddr_t *to)
could_send = multihop_send(&c->multihop, to);
if(!could_send) {
if(c->queued_data != NULL) {
queuebuf_free(c->queued_data);
}
PRINTF("mesh_send: queueing data, sending rreq\n");
c->queued_data = queuebuf_new_from_packetbuf();
rimeaddr_copy(&c->queued_data_dest, to);
route_discovery_discover(&c->route_discovery_conn, to,
PACKET_TIMEOUT);
PRINTF("mesh_send: could not send\n");
return 0;
}
c->cb->sent(c);

17
core/net/rime/multihop.c
View file

@ -94,11 +94,10 @@ data_packet_received(struct unicast_conn *uc, const rimeaddr_t *from)
} else {
nexthop = NULL;
if(c->cb->forward) {
nexthop = c->cb->forward(c, &sender, &receiver,
from, packetbuf_attr(PACKETBUF_ATTR_HOPS));
packetbuf_set_attr(PACKETBUF_ATTR_HOPS,
packetbuf_attr(PACKETBUF_ATTR_HOPS) + 1);
nexthop = c->cb->forward(c, &sender, &receiver,
from, packetbuf_attr(PACKETBUF_ATTR_HOPS) - 1);
}
if(nexthop) {
PRINTF("forwarding to %d.%d\n", nexthop->u8[0], nexthop->u8[1]);
@ -133,6 +132,9 @@ multihop_send(struct multihop_conn *c, const rimeaddr_t *to)
return 0;
}
packetbuf_compact();
packetbuf_set_addr(PACKETBUF_ADDR_ERECEIVER, to);
packetbuf_set_addr(PACKETBUF_ADDR_ESENDER, &rimeaddr_node_addr);
packetbuf_set_attr(PACKETBUF_ATTR_HOPS, 1);
nexthop = c->cb->forward(c, &rimeaddr_node_addr, to, NULL, 0);
if(nexthop == NULL) {
@ -141,12 +143,15 @@ multihop_send(struct multihop_conn *c, const rimeaddr_t *to)
} else {
PRINTF("multihop_send: sending data towards %d.%d\n",
nexthop->u8[0], nexthop->u8[1]);
packetbuf_set_addr(PACKETBUF_ADDR_ERECEIVER, to);
packetbuf_set_addr(PACKETBUF_ADDR_ESENDER, &rimeaddr_node_addr);
packetbuf_set_attr(PACKETBUF_ATTR_HOPS, 1);
unicast_send(&c->c, nexthop);
return 1;
}
}
/*---------------------------------------------------------------------------*/
void
multihop_resend(const struct multihop_conn *const c, const rimeaddr_t *const nexthop)
{
unicast_send(&c->c, nexthop);
}
/*---------------------------------------------------------------------------*/
/** @} */

1
core/net/rime/multihop.h
View file

@ -104,6 +104,7 @@ void multihop_open(struct multihop_conn *c, uint16_t channel,
const struct multihop_callbacks *u);
void multihop_close(struct multihop_conn *c);
int multihop_send(struct multihop_conn *c, const rimeaddr_t *to);
void multihop_resend(const struct multihop_conn *const c, const rimeaddr_t *const nexthop);
#endif /* __MULTIHOP_H__ */
/** @} */