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Zhe Weng 075eb6a6d2 net/udp: Change conn->readahead to I/O buffer chain 
When using IOB queue to store readahead data, we use one IOB for each
UDP packet. Then if the packets are very small, like 10Bytes per packet,
we'll use ~1600 IOBs just for 16KB recv buffer size, which is wasteful
and dangerous. So change conn->readahead to a single IOB chain like TCP.

Benefits:
- Using memory and IOBs more efficiently (small packets are common in
  UDP)

Side effects:
- UDP recv buffer size may count the overhead
- A little bit drop in performance (<1%, more seek & copy)

Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
2023-07-18 10:51:45 +08:00
..
arp
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
bluetooth
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
can
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
devif
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
icmp
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
icmpv6
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
ieee802154
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
igmp
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
inet
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
ipforward
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
ipfrag
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
local
net/local: remove client from server.lc_waiters when client close
2023-07-17 09:01:36 +02:00
mld
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
nat
net/nat: Fix compiler warning
2023-07-12 19:29:14 +08:00
neighbor
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
netdev
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
netfilter
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
netlink
netlink: add some definition
2023-07-08 11:12:41 -03:00
pkt
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
procfs
net/udp: Change conn->readahead to I/O buffer chain
2023-07-18 10:51:45 +08:00
route
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
rpmsg
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
sixlowpan
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
socket
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
tcp
net/udp: Change conn->readahead to I/O buffer chain
2023-07-18 10:51:45 +08:00
udp
net/udp: Change conn->readahead to I/O buffer chain
2023-07-18 10:51:45 +08:00
usrsock
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
utils
net: Rename tcp_dataconcat to net_iob_concat
2023-07-18 10:51:45 +08:00
CMakeLists.txt
build: add initial cmake build system
2023-07-08 13:50:48 +08:00
Kconfig
net: Limit max value for Send/Recv bufsize
2023-07-05 13:57:08 +08:00
Makefile
Support fragmentation and reassembly
2023-01-17 14:01:37 +08:00
net_initialize.c
…
README.txt
Support fragmentation and reassembly
2023-01-17 14:01:37 +08:00

README.txt 

README
======

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

  nuttx/
   |
   `- net/
       |
       +- arp        - Address resolution protocol (IPv4)
       +- bluetooth  - PF_BLUETOOTH socket interface
       +- devif      - Stack/device interface layer
       +- ipfrag     - Fragmentation and reassembly
       +- 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   |
    +----------------------------------------------------------------+ +--------------------------+