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tcp_output: faster return when nothing is to send (pcb->unsent == NULL)
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@ -1048,26 +1048,6 @@ tcp_output(struct tcp_pcb *pcb)
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return tcp_send_empty_ack(pcb);
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return tcp_send_empty_ack(pcb);
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}
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}
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/* useg should point to last segment on unacked queue */
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useg = pcb->unacked;
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if (useg != NULL) {
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for (; useg->next != NULL; useg = useg->next);
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}
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netif = tcp_route(pcb, &pcb->local_ip, &pcb->remote_ip);
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if (netif == NULL) {
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return ERR_RTE;
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}
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/* If we don't have a local IP address, we get one from netif */
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if (ip_addr_isany(&pcb->local_ip)) {
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const ip_addr_t *local_ip = ip_netif_get_local_ip(netif, &pcb->remote_ip);
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if (local_ip == NULL) {
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return ERR_RTE;
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}
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ip_addr_copy(pcb->local_ip, *local_ip);
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}
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#if TCP_OUTPUT_DEBUG
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#if TCP_OUTPUT_DEBUG
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if (seg == NULL) {
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if (seg == NULL) {
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LWIP_DEBUGF(TCP_OUTPUT_DEBUG, ("tcp_output: nothing to send (%p)\n",
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LWIP_DEBUGF(TCP_OUTPUT_DEBUG, ("tcp_output: nothing to send (%p)\n",
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@ -1095,6 +1075,26 @@ tcp_output(struct tcp_pcb *pcb)
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goto output_done;
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goto output_done;
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}
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}
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/* useg should point to last segment on unacked queue */
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useg = pcb->unacked;
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if (useg != NULL) {
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for (; useg->next != NULL; useg = useg->next);
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}
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netif = tcp_route(pcb, &pcb->local_ip, &pcb->remote_ip);
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if (netif == NULL) {
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return ERR_RTE;
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}
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/* If we don't have a local IP address, we get one from netif */
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if (ip_addr_isany(&pcb->local_ip)) {
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const ip_addr_t *local_ip = ip_netif_get_local_ip(netif, &pcb->remote_ip);
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if (local_ip == NULL) {
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return ERR_RTE;
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}
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ip_addr_copy(pcb->local_ip, *local_ip);
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}
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/* Check if we need to start the persistent timer when the next unsent segment
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/* Check if we need to start the persistent timer when the next unsent segment
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* does not fit within the remaining send window and RTO timer is not running (we
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* does not fit within the remaining send window and RTO timer is not running (we
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* have no in-flight data). A traditional approach would fill the remaining window
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* have no in-flight data). A traditional approach would fill the remaining window
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