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tcp_output: faster return when nothing is to send (pcb->unsent == NULL)

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This commit is contained in:
goldsimon 2017-06-29 08:47:26 +02:00
parent 48e55b1e5d
commit 5bddbdd914
1 changed files with 20 additions and 20 deletions
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40
src/core/tcp_out.c
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@ -1048,26 +1048,6 @@ tcp_output(struct tcp_pcb *pcb)
return tcp_send_empty_ack(pcb);
}
/* useg should point to last segment on unacked queue */
useg = pcb->unacked;
if (useg != NULL) {
for (; useg->next != NULL; useg = useg->next);
}
netif = tcp_route(pcb, &pcb->local_ip, &pcb->remote_ip);
if (netif == NULL) {
return ERR_RTE;
}
/* If we don't have a local IP address, we get one from netif */
if (ip_addr_isany(&pcb->local_ip)) {
const ip_addr_t *local_ip = ip_netif_get_local_ip(netif, &pcb->remote_ip);
if (local_ip == NULL) {
return ERR_RTE;
}
ip_addr_copy(pcb->local_ip, *local_ip);
}
#if TCP_OUTPUT_DEBUG
if (seg == NULL) {
LWIP_DEBUGF(TCP_OUTPUT_DEBUG, ("tcp_output: nothing to send (%p)\n",
@ -1095,6 +1075,26 @@ tcp_output(struct tcp_pcb *pcb)
goto output_done;
}
/* useg should point to last segment on unacked queue */
useg = pcb->unacked;
if (useg != NULL) {
for (; useg->next != NULL; useg = useg->next);
}
netif = tcp_route(pcb, &pcb->local_ip, &pcb->remote_ip);
if (netif == NULL) {
return ERR_RTE;
}
/* If we don't have a local IP address, we get one from netif */
if (ip_addr_isany(&pcb->local_ip)) {
const ip_addr_t *local_ip = ip_netif_get_local_ip(netif, &pcb->remote_ip);
if (local_ip == NULL) {
return ERR_RTE;
}
ip_addr_copy(pcb->local_ip, *local_ip);
}
/* Check if we need to start the persistent timer when the next unsent segment
* does not fit within the remaining send window and RTO timer is not running (we
* have no in-flight data). A traditional approach would fill the remaining window