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chao.an c2b0006dcd net/tcp: implement the fast retransmit 
RFC2001: TCP Slow Start, Congestion Avoidance, Fast Retransmit,
         and Fast Recovery Algorithms

...

3.  Fast Retransmit
  Modifications to the congestion avoidance algorithm were proposed in
  1990 [3].  Before describing the change, realize that TCP may
  generate an immediate acknowledgment (a duplicate ACK) when an out-
  of-order segment is received (Section 4.2.2.21 of [1], with a note
  that one reason for doing so was for the experimental fast-
  retransmit algorithm).  This duplicate ACK should not be delayed.
  The purpose of this duplicate ACK is to let the other end know that a
  segment was received out of order, and to tell it what sequence
  number is expected.

  Since TCP does not know whether a duplicate ACK is caused by a lost
  segment or just a reordering of segments, it waits for a small number
  of duplicate ACKs to be received.  It is assumed that if there is
  just a reordering of the segments, there will be only one or two
  duplicate ACKs before the reordered segment is processed, which will
  then generate a new ACK.  If three or more duplicate ACKs are
  received in a row, it is a strong indication that a segment has been
  lost.  TCP then performs a retransmission of what appears to be the
  missing segment, without waiting for a retransmission timer to
  expire.

Change-Id: Ie2cbcecab507c3d831f74390a6a85e0c5c8e0652
Signed-off-by: chao.an <anchao@xiaomi.com>
2020-12-01 11:36:10 -06:00
..
arp
Run nxstyle all .c and .h files modified by PR.
2020-05-17 14:01:00 -03:00
bluetooth
net/bluetooth/bluetooth_sendto.c: Fix a syslog format
2020-11-23 05:00:10 -08:00
can
style/Kconfig: remove unnecessary trailing whitespace
2020-11-28 12:20:30 +01:00
devif
net/devif/devif_callback.c: remove harmful debug check
2020-10-26 14:19:01 -03:00
icmp
net/icmp: add sanity check to avoid wild data length
2020-11-27 06:45:16 -08:00
icmpv6
net/icmp: add sanity check to avoid wild data length
2020-11-27 06:45:16 -08:00
ieee802154
net/ieee802154/ieee802154_sendto.c: Fix a syslog format
2020-11-24 22:31:33 -08:00
igmp
net/igmp/igmp_poll.c: Fix syslog formats
2020-11-23 05:00:10 -08:00
inet
Fix nxstyle warning
2020-08-22 17:37:21 -06:00
ipforward
Fix typos in comments and documentation.
2020-03-16 20:01:11 -06:00
local
net/local/local_sockif.c: Fix a syslog format error
2020-11-20 22:22:53 -08:00
mld
Sources and Docs: Fix typos and nxstyle issues
2020-10-02 04:54:52 +02:00
neighbor
net/neighbor/neighbor_ethernet_out.c: fix build error without ICMPv6
2020-11-27 10:27:45 -06:00
netdev
style/Kconfig: remove unnecessary trailing whitespace
2020-11-28 12:20:30 +01:00
netlink
net: Add SocketCAN support
2020-06-15 08:07:19 -06:00
pkt
net: Add SocketCAN support
2020-06-15 08:07:19 -06:00
procfs
net/procfs/netdev_statistics.c: Fix a printf format warning
2020-11-16 08:29:00 -08:00
route
Check return from nxsem_wait_initialize()
2020-03-29 20:11:10 +01:00
sixlowpan
net/tcp: fallback to unthrottle pool to avoid deadlock
2020-11-28 00:03:47 -06:00
socket
style/Kconfig: remove unnecessary trailing whitespace
2020-11-28 12:20:30 +01:00
tcp
net/tcp: implement the fast retransmit
2020-12-01 11:36:10 -06:00
udp
net/udp/udp_sendto_buffered.c: Fix a syslog format
2020-11-24 22:31:33 -08:00
usrsock
net/usrsock/usrsock_dev.c: Fix syslog formats
2020-11-27 05:18:57 -06:00
utils
Fix nxstyle warning
2020-10-20 01:45:06 -07:00
Kconfig
net:Add ARCH_PHY_POLLED option
2020-10-01 15:28:51 +08:00
Makefile
style/Makefile: remove unnecessary trailing whitespace
2020-11-28 12:20:30 +01:00
net_initialize.c
net: Add SocketCAN support
2020-06-15 08:07:19 -06:00
README.txt
net/loopback: Move g_lo_* global variable to libc/net/
2020-03-30 09:47:28 -06:00

README.txt 

README
======

Directory Structure
===================

  nuttx/
   |
   `- net/
       |
       +- arp        - Address resolution protocol (IPv4)
       +- bluetooth  - PF_BLUETOOTH socket interface
       +- devif      - Stack/device interface layer
       +- icmp       - Internet Control Message Protocol (IPv4)
       +- icmpv6     - Internet Control Message Protocol (IPv6)
       +- ieee802154 - PF_IEEE802154 socket interface
       +- inet       - PF_INET/PF_INET6 socket interface
       +- ipforward  - IP forwarding logic
       +- local      - Unix domain (local) sockets
       +- mld        - Multicast Listener Discovery (MLD)
       +- neighbor   - Neighbor Discovery Protocol (IPv6)
       +- netdev     - Socket network device interface
       +- netlink    - Netlink IPC socket interface
       +- pkt        - "Raw" packet socket support
       +- sixlowpan  - 6LoWPAN implementation
       +- socket     - BSD socket interface
       +- route      - Routing table support
       +- tcp        - Transmission Control Protocol
       +- udp        - User Datagram Protocol
       +- usrsock    - User socket API for user-space networking stack
       `- utils      - Miscellaneous utility functions

    +-------------------------------------------------------------------++------------------------+
    |                     Application layer                             || usrsock daemon         |
    +-------------------------------------------------------------------++------------------------+
    +-------------------------------------------------------------------++----------------+ +-----+
    |                   Socket layer (socket/)                          || /dev/usrsock   | |     |
    +-------------------------------------------------------------------++----------------+ |     |
    +------------++--------------------------------------------------++-------------------+ |     |
    |  Network   || Protocol stacks (arp, ipv6, icmp, pkt, tcp, udp) || usrsock/          | |     |
    |   Device   |+--------------------------------------------------++-------------------+ |     |
    | Interface  |+------------------------------------++---------------------------------+ |     |
    | (netdev/)  ||  Network Device Interface (devif/) || Utilities                       | |     |
    +------------++------------------------------------++---------------------------------+ |     |
    +----------------------------------------------------------------+                      |     |
    |                    Network Device Drivers                      |                      | HAL |
    +----------------------------------------------------------------+                      +-----+
    +----------------------------------------------------------------+ +--------------------------+
    |                    Networking Hardware                         | |  Hardware TCP/IP Stack   |
    +----------------------------------------------------------------+ +--------------------------+