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Handle retransmits inside the connection module

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Thomas Kolb 2024-11-02 20:20:39 +01:00
parent ec3244a61f
commit 97a23701d0
2 changed files with 27 additions and 1 deletions
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19
impl/src/layer2/connection.c
View file

@ -7,6 +7,7 @@
#include "layer2/ham64.h"
#include "layer2/packet_queue.h"
#include "results.h"
#include "utils.h"
#define SEQ_NR_MASK 0xF
@ -367,7 +368,9 @@ void connection_handle_ack(connection_ctx_t *ctx, uint8_t acked_seq, bool do_ack
packets_available = packet_queue_get_used_space(&ctx->packet_queue);
LOG(LVL_DEBUG, "handling ack for seq_nr %u, removing %zu packets, %zu packets remaining.", acked_seq, packets_to_remove, packets_available);
LOG(LVL_DEBUG, "handling ack for seq_nr %u, removed %zu packets, %zu packets remaining.", acked_seq, packets_to_remove, packets_available);
ctx->retransmit_time = get_hires_time() + HRTIME_MS(RETRANSMIT_TIMEOUT_MS);
if(do_ack && packets_available == 0) {
// no packets left in queue, but an acknowledgement must be
@ -387,3 +390,17 @@ bool connection_can_transmit(const connection_ctx_t *ctx)
return (packet_queue_get_used_space(&ctx->packet_queue) != 0)
&& (packet_queue_get(&ctx->packet_queue, ctx->next_packet_index) != NULL);
}
result_t connection_maintain(connection_ctx_t *ctx)
{
uint64_t now = get_hires_time();
if(ctx->retransmit_time != 0 && now >= ctx->retransmit_time) {
LOG(LVL_INFO, "Retransmit triggered.");
ctx->retransmit_time = 0;
connection_restart_tx(ctx);
}
return OK;
}

9
impl/src/layer2/connection.h
View file

@ -42,6 +42,9 @@ typedef struct connection_ctx_s {
size_t next_packet_index; //!< Index in the packet queue of the next packet to transmit.
uint8_t next_seq_nr; //!< Sequence number to tag the next transmitted packet with.
uint64_t retransmit_time; //!< Time when a retransmit shall be triggered.
uint64_t last_rx_time; //!< Time when a packet was last received and decoded.
} connection_ctx_t;
@ -129,4 +132,10 @@ void connection_handle_ack(connection_ctx_t *ctx, uint8_t acked_seq, bool do_ack
*/
bool connection_can_transmit(const connection_ctx_t *ctx);
/*!\brief Handle internal maintenance tasks.
*
* This should be called periodically to handle timeouts and retransmissions.
*/
result_t connection_maintain(connection_ctx_t *ctx);
#endif // CONNECTION_H