3c0b49448a
Historically, the loopback driver used the largest packet size of all enabled link layer protocols. This permitted packets to be forward via the loopbak device with no major loss of performance. However, in experimenting with configurations where no other link layer protocols were enabled, this means the loopback packet size was set to the smallest possible size, to the SLIP minimum of 296 bytes. This resulted in terrible loopback performance.
This commit adds an option to increase the loopback packet size with the option CONFIG_NET_LOOPBACK_PACKETSIZE.
The loopback driver packet buffer should be quite large. The larger the loopback packet buffer, the better will be TCP performance of the loopback transfers. The Linux loopback device historically used packet buffers of size 16Kb, but that was increased in recent Linux versions to 64Kb. Those sizes may be excessive for resource constrained MCUs, however.
The network still enforces the lower limit that is the maximum packet size of all enabled link layer protocols. But this new option permits the loopback packet size to be increased from that.
* net/Kconfig: Adds CONFIG_NET_LOOPBACK_PKTSIZE option
* include/nuttx/net/netconfig.h: Assures that the packet size that is used is at least as large as the largest packet size of other link layer protocols.
* drivers/net/loopback.c: Use that larger packet size.
* boards/sim/sim/sim/configs/tcploop/defconfig: Set the loopback packet size to 1500
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|---|---|---|
| .. | ||
| arp | ||
| bluetooth | ||
| devif | ||
| icmp | ||
| icmpv6 | ||
| ieee802154 | ||
| igmp | ||
| inet | ||
| ipforward | ||
| local | ||
| loopback | ||
| mld | ||
| neighbor | ||
| netdev | ||
| netlink | ||
| pkt | ||
| procfs | ||
| route | ||
| sixlowpan | ||
| socket | ||
| tcp | ||
| udp | ||
| usrsock | ||
| utils | ||
| .gitignore | ||
| Kconfig | ||
| Makefile | ||
| net_initialize.c | ||
| 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
+- loopback - Local loopback
+- 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 |
+----------------------------------------------------------------+ +--------------------------+