# # For a description of the syntax of this configuration file, # see the file kconfig-language.txt in the NuttX tools repository. # config ARCH_HAVE_NET bool default n config ARCH_HAVE_PHY bool default n config ARCH_PHY_INTERRUPT bool default n config ARCH_PHY_POLLED bool default n config ARCH_HAVE_NETDEV_STATISTICS bool default n config NET_WRITE_BUFFERS bool default n select MM_IOB config NET_READAHEAD bool default n select MM_IOB config NET_MCASTGROUP bool default n config NET bool "Networking support" default n select ARCH_HAVE_NET ---help--- Enable or disable all network features if NET config NET_PROMISCUOUS bool "Promiscuous mode" default n ---help--- Force the Ethernet driver to operate in promiscuous mode (if supported by the Ethernet driver). menu "Driver buffer configuration" config NET_ETH_PKTSIZE int "Ethernet packet buffer size" default 1294 if NET_IPv6 default 590 if !NET_IPv6 range 1294 1518 if NET_IPv6 range 590 1518 if !NET_IPv6 depends on NET_ETHERNET ---help--- Packet buffer size. This size includes the TCP/UDP payload plus the size of TCP/UDP header, the IP header, and the Ethernet header. This value is related to the MTU (Maximum Transmission Unit), except that it includes the size of the link layer header; the payload is the MSS (Maximum Segment Size). IPv4 hosts are required to be able to handle an MSS of at least 536 octets, resulting in a minimum buffer size of 536+20+20+14 = 590. IPv6 hosts are required to be able to handle an MSS of 1220 octets, resulting in a minimum buffer size of 1220+20+40+14 = 1294 To get an MTU of 1500, for example, you would need packet buffer of size 1514. config NET_SLIP_PKTSIZE int "SLIP packet buffer size" default 296 depends on NET_SLIP range 296 1518 ---help--- Provides the size of the SLIP packet buffers. This size includes the TCP/UDP payload plus the size of TCP/UDP header and the IP header. This value is related to the MTU (Maximum Transmission Unit), except that it includes the size of the link layer header; the payload is the MSS (Maximum Segment Size). SLIP has no link layer header so for SLIP the MTU is the same as the PKTSIZE. SLIP is required to support at least 256+20+20 = 296. Values other than 296 are not recommended. The Linux slip module hard-codes its MTU size to 296 (40 bytes for the IP+TCP headers plus 256 bytes of data). So you might as well set CONFIG_NET_SLIP_PKTSIZE to 296 as well. There may be an issue with this setting, however. I see that Linux uses a MTU of 296 and window of 256, but actually only sends 168 bytes of data: 40 + 128. I believe that is to allow for the 2x worst cast packet expansion. Ideally we would like to advertise the 256 MSS, but restrict transfers to 128 bytes (possibly by modifying the MSS value in the TCP connection structure). config NET_GUARDSIZE int "Driver I/O guard size" default 2 ---help--- Network drivers often receive packets with garbage at the end and are longer than the size of packet in the TCP header. The following "fudge" factor increases the size of the I/O buffering by a small amount to allocate slightly oversize packets. After receipt, the packet size will be chopped down to the size indicated in the TCP header. config NET_LL_GUARDSIZE int "Data Link Layer(L2) Guard size of Network buffer(IOB)" default 16 if NET_CAN && NET_TIMESTAMP default 14 if NET_ETHERNET default 0 ---help--- This is reserved l2 buffer header size of network buffer to isolate the L2/L3 (MAC/IP) data on Network layer, which will be beneficial to L3 network layer protocol transparent transmission and forwarding config NET_RECV_BUFSIZE int "Net Default Receive buffer size" default 0 ---help--- This is the default value for receive buffer size. config NET_MAX_RECV_BUFSIZE int "Net Max Receive buffer size" depends on NET_RECV_BUFSIZE > 0 default 0 ---help--- Limit the max value for receive buffer size to avoid overconsumption. Zero means no limit. config NET_SEND_BUFSIZE int "Net Default Send buffer size" depends on NET_TCP_WRITE_BUFFERS || NET_UDP_WRITE_BUFFERS default 0 ---help--- This is the default value for send buffer size. config NET_MAX_SEND_BUFSIZE int "Net Max Send buffer size" depends on NET_SEND_BUFSIZE > 0 default 0 ---help--- Limit the max value for send buffer size to avoid overconsumption. Zero means no limit. endmenu # Driver buffer configuration menu "Link layer support" config NET_ETHERNET bool "Ethernet support" default y ---help--- If NET_SLIP is not selected, then Ethernet will be used (there is no need to define anything special in the configuration file to use Ethernet -- it is the default). config NET_CELLULAR bool "Cellular Link support" default n ---help--- Add support for the cellular network device. Unlike Ethernet, cellular network transmit pure IP packets. config NET_LOOPBACK bool "Local loopback" select ARCH_HAVE_NETDEV_STATISTICS default n ---help--- Add support for the local network loopback device, lo. config NET_LOOPBACK_PKTSIZE int "Loopback packet buffer size" default 0 depends on NET_LOOPBACK range 0 65535 ---help--- 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 enforces a lower limit that is the maximum packet size of all enabled link layer protocols. The default value of CONFIG_NET_LOOPBACK_PKTSIZE is zero, meaning that this maximum packet size will be used by loopback driver. menuconfig NET_MBIM bool "MBIM modem support" depends on USBHOST_CDCMBIM default n menuconfig NET_SLIP bool "SLIP support" select ARCH_HAVE_NETDEV_STATISTICS depends on NET_IPv4 default n ---help--- Enables building of the SLIP driver. SLIP requires at least one IP protocol selected. SLIP supports point-to-point IP communications over a serial port. The default link layer for network layer is Ethernet. If NET_SLIP is defined in the NuttX configuration file, then SLIP will be supported. The basic differences between the SLIP and Ethernet configurations is that when SLIP is selected: * The link level header (that comes before the IP header) is omitted. * All MAC address processing is suppressed. * ARP is disabled. If NET_SLIP is not selected, then Ethernet will be used (there is no need to define anything special in the configuration file to use Ethernet -- it is the default). if NET_SLIP config NET_SLIP_NINTERFACES int "Number of SLIP interfaces" default 1 ---help--- Selects the number of physical SLIP interfaces to support. Default: 1 endif # NET_SLIP menuconfig NET_TUN bool "TUN Virtual Network Device support" default n depends on ALLOW_BSD_COMPONENTS select ARCH_HAVE_NETDEV_STATISTICS if NET_TUN config TUN_NINTERFACES int "Number of TUN interfaces" default 1 range 1 8 ---help--- Selects the number of TUN interfaces to support. Default: 1 config NET_TUN_PKTSIZE int "TUN packet buffer size" default 296 range 296 1518 ---help--- Provides the size of the TUN packet buffers. This size includes the TCP/UDP payload plus the size of TCP/UDP header and the IP header. This value is related to the MTU (Maximum Transmission Unit), except that it includes the size of the link layer header; the payload is the MSS (Maximum Segment Size). TUN has no link layer header so for TUN the MTU is the same as the PKTSIZE. endif # NET_TUN config NETDEV_LATEINIT bool "Late driver initialization" default n ---help--- Normally, networking initialization occur in the later phase of the boot process in the function up_initialize() when it calls the driver initialization function, xxx_netinitialize(). This initialization occurs after a sufficient amount of the OS has been initialized so that driver registration can be performed, but before the completion of OS initialization and before the first application is started. In a few situations, however, you may want to suppress this early network driver initialization. As examples: - If you are using SLIP or PPPD, then there will be no network driver to be initialized, - Certain multi-network configurations where a simple call to xxx_netinitialize() may be insufficient, and - Situations where there are other board-level hardware dependencies so that the hardware is not in an appropriate state for xxx_netinitialize() to be called. Examples of this latter situation include such things as network drivers that required some setup via an I2C I/O expander, or network drivers that depend on USB, SPI, I2C, PCI, serial, or other interfaces that may not be ready when xxx_netinitialize() is normally called. endmenu # Link layer support source "net/netdev/Kconfig" menu "Internet Protocol Selection" config NET_IPv4 bool "IPv4" default y ---help--- Build in support for IPv4. config NET_IPv6 bool "IPv6" default n ---help--- Build in support for IPv6. source "net/neighbor/Kconfig" menuconfig NET_6LOWPAN bool "6LoWPAN support" default n select NETDEV_IOCTL select NET_HAVE_STAR depends on NET_IPv6 ---help--- Enable support for Low power Wireless Personal Area Networking (6LoWPAN) for IEEE 802.15.4 or other packet radios. source "net/sixlowpan/Kconfig" source "net/ipforward/Kconfig" source "net/nat/Kconfig" source "net/netfilter/Kconfig" source "net/ipfrag/Kconfig" endmenu # Internet Protocol Selection source "net/socket/Kconfig" source "net/inet/Kconfig" source "net/pkt/Kconfig" source "net/local/Kconfig" source "net/rpmsg/Kconfig" source "net/can/Kconfig" source "net/netlink/Kconfig" source "net/tcp/Kconfig" source "net/udp/Kconfig" source "net/bluetooth/Kconfig" source "net/ieee802154/Kconfig" source "net/icmp/Kconfig" source "net/icmpv6/Kconfig" source "net/mld/Kconfig" source "net/igmp/Kconfig" source "net/arp/Kconfig" source "net/procfs/Kconfig" source "net/usrsock/Kconfig" source "net/utils/Kconfig" config NET_STATISTICS bool "Collect network statistics" default n ---help--- Network layer statistics on or off config NET_HAVE_STAR bool default n ---help--- Automatically enabled if at least one selected L2 protocol supports a STAR topology. In order to support the star topology, the L2 protocol must support relaying all packets to a well-known hub node. menu "Network Topologies" config NET_STAR bool "Enable star topology" default n depends on NET_HAVE_STAR && NET_IPv6 ---help--- Enable support for a star network topology. NOTE: Currently only supported by 6LoWPAN. NOTE: L2 forwarding only supported for IPv6. choice prompt "Node role" depends on NET_STAR default NET_STARPOINT ---help--- Specifies the role of this not in the star configuration. config NET_STARPOINT bool "Point node in star" ---help--- The node is a "point" in the star configuration and must send all packets to the star hub node. config NET_STARHUB bool "Hub node of star" select NET_IPFORWARD ---help--- This is the "hub" node in the star configurations. It will receive packets packets from all "point" nodes and perform L2 forwarding of the packets that are not destined for this node. endchoice # Node role endmenu # Network Topologies source "net/route/Kconfig" endif # NET