static inline void recvfrom_newtcpdata(FAR struct uip_driver_s *dev,
FAR struct recvfrom_s *pstate)
{
/* Take as much data from the packet as we can */
size_t recvlen = recvfrom_newdata(dev, pstate);
/* If there is more data left in the packet that we could not buffer, than
* add it to the read-ahead buffers.
*/
if (recvlen < dev->d_len)
{
#if CONFIG_NET_NTCP_READAHEAD_BUFFERS > 0
FAR struct uip_conn *conn = (FAR struct uip_conn *)pstate->rf_sock->s_conn;
FAR uint8_t *buffer = (FAR uint8_t *)dev->d_appdata + recvlen;
uint16_t buflen = dev->d_len - recvlen;
#ifdef CONFIG_DEBUG_NET
uint16_t nsaved;
nsaved = uip_datahandler(conn, buffer, buflen);
#else
(void)uip_datahandler(conn, buffer, buflen);
#endif
/* There are complicated buffering issues that are not addressed fully
* here. For example, what if up_datahandler() cannot buffer the
* remainder of the packet? In that case, the data will be dropped but
* still ACKed. Therefore it would not be resent.
*
* This is probably not an issue here because we only get here if the
* read-ahead buffers are empty and there would have to be something
* serioulsy wrong with the configuration not to be able to buffer a
* partial packet in this context.
*/
#ifdef CONFIG_DEBUG_NET
if (nsaved < buflen)
{
ndbg("ERROR: packet data not saved (%d bytes)\n", buflen - nsaved);
}
#endif
#else
ndbg("ERROR: packet data lost (%d bytes)\n", dev->d_len - recvlen);
#endif
}
/* Indicate no data in the buffer */
dev->d_len = 0;
}
static inline uint16_t
uip_dataevent(FAR struct uip_driver_s *dev, FAR struct uip_conn *conn,
uint16_t flags)
{
uint16_t ret;
/* Assume that we will ACK the data. The data will be ACKed if it is
* placed in the read-ahead buffer -OR- if it zero length
*/
ret = (flags & ~UIP_NEWDATA) | UIP_SNDACK;
/* Is there new data? With non-zero length? (Certain connection events
* can have zero-length with UIP_NEWDATA set just to cause an ACK).
*/
if (dev->d_len > 0)
{
#ifdef CONFIG_NET_TCP_READAHEAD
uint8_t *buffer = dev->d_appdata;
int buflen = dev->d_len;
uint16_t recvlen;
#endif
nllvdbg("No listener on connection\n");
#ifdef CONFIG_NET_TCP_READAHEAD
/* Save as much data as possible in the read-ahead buffers */
recvlen = uip_datahandler(conn, buffer, buflen);
/* There are several complicated buffering issues that are not addressed
* properly here. For example, what if we cannot buffer the entire
* packet? In that case, some data will be accepted but not ACKed.
* Therefore it will be resent and duplicated. Fixing this could be tricky.
*/
if (recvlen < buflen)
#endif
{
/* There is no handler to receive new data and there are no free
* read-ahead buffers to retain the data -- drop the packet.
*/
nllvdbg("Dropped %d bytes\n", dev->d_len);
#ifdef CONFIG_NET_STATISTICS
uip_stat.tcp.syndrop++;
uip_stat.tcp.drop++;
#endif
/* Clear the UIP_SNDACK bit so that no ACK will be sent */
ret &= ~UIP_SNDACK;
}
}
/* In any event, the new data has now been handled */
dev->d_len = 0;
return ret;
}
