/**
* This function should be called by the application when it has
* processed the data. The purpose is to advertise a larger window
* when the data has been processed.
*
* @param pcb the tcp_pcb for which data is read
* @param len the amount of bytes that have been read by the application
*/
void
tcp_recved(struct tcp_pcb *pcb, u16_t len)
{
int wnd_inflation;
LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
len <= 0xffff - pcb->rcv_wnd );
pcb->rcv_wnd += len;
if (pcb->rcv_wnd > TCP_WND) {
pcb->rcv_wnd = TCP_WND;
}
wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
/* If the change in the right edge of window is significant (default
* watermark is TCP_WND/4), then send an explicit update now.
* Otherwise wait for a packet to be sent in the normal course of
* events (or more window to be available later) */
if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
tcp_ack_now(pcb);
tcp_output(pcb);
}
LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
}
/**
* This function should be called by the application when it has
* processed the data. The purpose is to advertise a larger window
* when the data has been processed.
*
* @param pcb the tcp_pcb for which data is read
* @param len the amount of bytes that have been read by the application
*/
void tcp_recved(TCP_PCB *pcb, uint16 len)
{
int wnd_inflation;
pcb->rcv_wnd += len;
if (pcb->rcv_wnd > TCP_WND)
{
pcb->rcv_wnd = TCP_WND;
}
wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
/* If the change in the right edge of window is significant (default
* watermark is TCP_WND/2), then send an explicit update now.
* Otherwise wait for a packet to be sent in the normal course of
* events (or more window to be available later) */
if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD)//tell receive window changed...
{
//printf("tcp_recved:");
tcp_ack_now(pcb);
}
return;
}