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This commit adds an initial implemented of TCP delayed ACKs as specified in RFC 1122.

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Squashed commit of the following:

    net/tmp:  Rename the unacked field of the tcp connection structure to tx_unacked.  Too confusing with the implementation of delayed RX ACKs.

    net/tcp:  Initial implementation of TCP delayed ACKs.

    net/tcp:  Add delayed ACK configuration selection.  Rename tcp_ack() to tcp_synack().  It may or may not send a ACK.  It will always send SYN or SYN/ACK.
This commit is contained in:
Gregory Nutt
2019-12-08 13:13:51 -06:00
parent 594734e0ae
commit 66ef6d143a
12 changed files with 174 additions and 71 deletions
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14
net/tcp/tcp.h
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@@ -175,15 +175,19 @@ struct tcp_conn_s
uint8_t timer; /* The retransmission timer (units: half-seconds) */
uint8_t nrtx; /* The number of retransmissions for the last
* segment sent */
#ifdef CONFIG_NET_TCP_DELAYED_ACK
uint8_t rx_unackseg; /* Number of un-ACKed received segments */
uint8_t rx_acktimer; /* Time since last ACK sent (units: half-seconds) */
#endif
uint16_t lport; /* The local TCP port, in network byte order */
uint16_t rport; /* The remoteTCP port, in network byte order */
uint16_t mss; /* Current maximum segment size for the
* connection */
uint16_t winsize; /* Current window size of the connection */
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
uint32_t unacked; /* Number bytes sent but not yet ACKed */
uint32_t tx_unacked; /* Number bytes sent but not yet ACKed */
#else
uint16_t unacked; /* Number bytes sent but not yet ACKed */
uint16_t tx_unacked; /* Number bytes sent but not yet ACKed */
#endif
/* If the TCP socket is bound to a local address, then this is
@@ -941,7 +945,7 @@ ssize_t tcp_sendfile(FAR struct socket *psock, FAR struct file *infile,
void tcp_reset(FAR struct net_driver_s *dev);
/****************************************************************************
* Name: tcp_ack
* Name: tcp_synack
*
* Description:
* Send the SYN or SYNACK response.
@@ -959,8 +963,8 @@ void tcp_reset(FAR struct net_driver_s *dev);
*
****************************************************************************/
void tcp_ack(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn,
uint8_t ack);
void tcp_synack(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn,
uint8_t ack);
/****************************************************************************
* Name: tcp_appsend