403 lines
11 KiB
Plaintext
403 lines
11 KiB
Plaintext
#
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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config ARCH_HAVE_NET
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bool
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default n
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config ARCH_HAVE_PHY
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bool
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default n
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config ARCH_PHY_INTERRUPT
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bool
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default n
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config ARCH_HAVE_NETDEV_STATISTICS
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bool
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default n
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config NET_WRITE_BUFFERS
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bool
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default n
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select MM_IOB
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config NET_READAHEAD
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bool
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default n
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select MM_IOB
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config NET_MCASTGROUP
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bool
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default n
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config NET
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bool "Networking support"
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default n
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select ARCH_HAVE_NET
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---help---
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Enable or disable all network features
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if NET
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config NET_PROMISCUOUS
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bool "Promiscuous mode"
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default n
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---help---
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Force the Ethernet driver to operate in promiscuous mode (if supported
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by the Ethernet driver).
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menu "Driver buffer configuration"
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config NET_ETH_PKTSIZE
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int "Ethernet packet buffer size"
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default 1294 if NET_IPv6
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default 590 if !NET_IPv6
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range 1294 1518 if NET_IPv6
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range 590 1518 if !NET_IPv6
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depends on NET_ETHERNET
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---help---
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Packet buffer size. This size includes the TCP/UDP payload plus the
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size of TCP/UDP header, the IP header, and the Ethernet header.
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This value is related to the MTU (Maximum Transmission Unit), except
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that it includes the size of the link layer header; the payload is
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the MSS (Maximum Segment Size).
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IPv4 hosts are required to be able to handle an MSS of at least
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536 octets, resulting in a minimum buffer size of 536+20+20+14 =
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590.
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IPv6 hosts are required to be able to handle an MSS of 1220 octets,
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resulting in a minimum buffer size of 1220+20+40+14 = 1294
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To get an MTU of 1500, for example, you would need packet buffer of
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size 1514.
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config NET_SLIP_PKTSIZE
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int "SLIP packet buffer size"
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default 296
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depends on NET_SLIP
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range 296 1518
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---help---
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Provides the size of the SLIP packet buffers. This size includes
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the TCP/UDP payload plus the size of TCP/UDP header and the IP header.
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This value is related to the MTU (Maximum Transmission Unit), except
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that it includes the size of the link layer header; the payload is
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the MSS (Maximum Segment Size). SLIP has no link layer header so for
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SLIP the MTU is the same as the PKTSIZE.
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SLIP is required to support at least 256+20+20 = 296. Values other than
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296 are not recommended.
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The Linux slip module hard-codes its MTU size to 296 (40 bytes for
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the IP+TCP headers plus 256 bytes of data). So you might as well
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set CONFIG_NET_SLIP_PKTSIZE to 296 as well.
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There may be an issue with this setting, however. I see that Linux
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uses a MTU of 296 and window of 256, but actually only sends 168
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bytes of data: 40 + 128. I believe that is to allow for the 2x
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worst cast packet expansion. Ideally we would like to advertise the
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256 MSS, but restrict transfers to 128 bytes (possibly by modifying
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the MSS value in the TCP connection structure).
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config NET_GUARDSIZE
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int "Driver I/O guard size"
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default 2
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---help---
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Network drivers often receive packets with garbage at the end and
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are longer than the size of packet in the TCP header. The following
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"fudge" factor increases the size of the I/O buffering by a small
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amount to allocate slightly oversize packets. After receipt, the
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packet size will be chopped down to the size indicated in the TCP
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header.
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endmenu # Driver buffer configuration
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menu "Link layer support"
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config NET_ETHERNET
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bool "Ethernet support"
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default y
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---help---
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If NET_SLIP is not selected, then Ethernet will be used (there is
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no need to define anything special in the configuration file to use
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Ethernet -- it is the default).
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config NET_LOOPBACK
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bool "Local loopback"
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select ARCH_HAVE_NETDEV_STATISTICS
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default n
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---help---
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Add support for the local network loopback device, lo.
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config NET_LOOPBACK_PKTSIZE
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int "Loopback packet buffer size"
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default 0
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depends on NET_LOOPBACK
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range 0 65535
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---help---
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The loopback driver packet buffer should be quite large. The larger
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the loopback packet buffer, the better will be TCP performance of
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the loopback transfers. The Linux loopback device historically used
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packet buffers of size 16Kb, but that was increased in recent Linux
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versions to 64Kb. Those sizes may be excessive for resource
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constrained MCUs, however.
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The network enforces a lower limit that is the maximum packet size
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of all enabled link layer protocols. The default value of
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CONFIG_NET_LOOPBACK_PKTSIZE is zero, meaning that this maximum
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packet size will be used by loopback driver.
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menuconfig NET_MBIM
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bool "MBIM modem support"
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depends on USBHOST_CDCMBIM
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default n
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menuconfig NET_SLIP
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bool "SLIP support"
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select ARCH_HAVE_NETDEV_STATISTICS
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default n
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---help---
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Enables building of the SLIP driver. SLIP requires
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at least one IP protocol selected.
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SLIP supports point-to-point IP communications over a serial port.
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The default link layer for network layer is Ethernet. If NET_SLIP
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is defined in the NuttX configuration file, then SLIP will be
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supported. The basic differences between the SLIP and Ethernet
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configurations is that when SLIP is selected:
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* The link level header (that comes before the IP header) is omitted.
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* All MAC address processing is suppressed.
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* ARP is disabled.
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If NET_SLIP is not selected, then Ethernet will be used (there is
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no need to define anything special in the configuration file to use
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Ethernet -- it is the default).
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if NET_SLIP
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config SLIP_NINTERFACES
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int "Number of SLIP interfaces"
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default 1
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---help---
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Selects the number of physical SLIP
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interfaces to support.
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Default: 1
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config SLIP_STACKSIZE
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int "SLIP stack size"
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default DEFAULT_TASK_STACKSIZE
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---help---
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Select the stack size of the SLIP RX and TX tasks.
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config SLIP_DEFPRIO
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int "SLIP priority"
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default 128
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---help---
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The priority of the SLIP RX and TX tasks. Default: 128
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endif # NET_SLIP
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menuconfig NET_TUN
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bool "TUN Virtual Network Device support"
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default n
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select ARCH_HAVE_NETDEV_STATISTICS
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if NET_TUN
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config TUN_NINTERFACES
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int "Number of TUN interfaces"
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default 1
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range 1 8
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---help---
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Selects the number of TUN
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interfaces to support.
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Default: 1
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config NET_TUN_PKTSIZE
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int "TUN packet buffer size"
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default 296
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range 296 1518
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---help---
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Provides the size of the TUN packet buffers. This size includes
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the TCP/UDP payload plus the size of TCP/UDP header and the IP header.
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This value is related to the MTU (Maximum Transmission Unit), except
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that it includes the size of the link layer header; the payload is
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the MSS (Maximum Segment Size). TUN has no link layer header so for
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TUN the MTU is the same as the PKTSIZE.
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endif # NET_TUN
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config NETDEV_LATEINIT
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bool "Late driver initialization"
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default n
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---help---
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Normally, networking initialization occur in the later phase of the
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boot process in the function up_initialize() when it calls the
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driver initialization function, up_netinitialize(). This
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initialization occurs after a sufficient about of the OS has been
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initialized so that driver registration can be performed, but
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before the completion of OS initialization and before the first
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application is started.
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In a few situations, however, you may want to suppress this early
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network driver initialization. As examples:
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- If you are using SLIP or PPPD, then there will be no network
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driver to be initialized,
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- Certain multi-network configurations where a simple call to
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up_netinitialize() may be insufficient, and
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- Situations where there are other board-level hardware
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dependencies so that the hardware is not in an appropriate
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state for up_netinitialize() to be called.
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Examples of this latter situation includes such things as network
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drivers that required some setup via an I2C I/O expander, or network
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drivers that depend on USB, SPI, I2C, PCI, serial, or other
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interfaces that may not be ready when up_netinitialize() is normally
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called.
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endmenu # Link layer support
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source "net/netdev/Kconfig"
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menu "Internet Protocol Selection"
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config NET_IPv4
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bool "IPv4"
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default y
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---help---
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Build in support for IPv4.
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config NET_IPv4_REASSEMBLY
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bool "IPv4 reassembly"
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default n
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depends on NET_IPv4 && EXPERIMENTAL && NET_ETHERNET
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---help---
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Enable support for IP packet reassembly of fragmented IP packets.
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This features requires an additional amount of RAM to hold a single
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reassembly buffer. The reassembly buffer is of the same size as the
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MTU of the selected device.
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REVISIT: There are multiple issues with the current implementation:
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1. IPv4 reassembly in its current form is untested (and, hence,
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depends on CONFIG_EXPERIMENTAL).
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2. Currently this feature can only work with Ethernet due to internal
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definitions that depend on Ethernet configuration settings (and,
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hence, depends on CONFIG_NET_ETHERNET).
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3. Since there is only a single reassembly buffer, IPv4 reassembly
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cannot be used in a context where multiple network devices may be
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concurrently re-assemblying packets.
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if NET_IPv4_REASSEMBLY
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config NET_IPv4_REASS_MAXAGE
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int "IP fragment timeout"
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default 200
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---help---
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The maximum time an IP fragment should wait in the reassembly buffer
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before it is dropped. Units are deci-seconds, the range of the timer
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is 8-bits. Default: 20 seconds.
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endif # NET_IPv4_REASSEMBLY
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config NET_IPv6
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bool "IPv6"
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default n
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---help---
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Build in support for IPv6.
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source "net/neighbor/Kconfig"
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menuconfig NET_6LOWPAN
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bool "6LoWPAN support"
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default n
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select NETDEV_IOCTL
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select NET_HAVE_STAR
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depends on NET_IPv6
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---help---
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Enable support for Low power Wireless Personal Area Networking (6LoWPAN)
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for IEEE 802.15.4 or other packet radios.
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source "net/sixlowpan/Kconfig"
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source "net/ipforward/Kconfig"
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endmenu # Internet Protocol Selection
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source "net/socket/Kconfig"
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source "net/inet/Kconfig"
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source "net/pkt/Kconfig"
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source "net/local/Kconfig"
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source "net/can/Kconfig"
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source "net/netlink/Kconfig"
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source "net/tcp/Kconfig"
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source "net/udp/Kconfig"
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source "net/bluetooth/Kconfig"
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source "net/ieee802154/Kconfig"
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source "net/icmp/Kconfig"
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source "net/icmpv6/Kconfig"
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source "net/mld/Kconfig"
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source "net/igmp/Kconfig"
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source "net/arp/Kconfig"
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source "net/procfs/Kconfig"
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source "net/usrsock/Kconfig"
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source "net/utils/Kconfig"
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config NET_STATISTICS
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bool "Collect network statistics"
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default n
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---help---
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Network layer statistics on or off
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config NET_HAVE_STAR
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bool
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default n
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---help---
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Automatically enabled if at least one selected L2 protocol supports
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a STAR topology. In order to support the star topology, the L2
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protocol must support relaying all packets to a well-known hub node.
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menu "Network Topologies"
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config NET_STAR
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bool "Enable star topology"
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default n
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depends on NET_HAVE_STAR && NET_IPv6
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---help---
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Enable support for a star network topology.
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NOTE: Currently only supported by 6LoWPAN.
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NOTE: L2 forwarding only supported for IPv6.
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choice
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prompt "Node role"
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depends on NET_STAR
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default NET_STARPOINT
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---help---
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Specifies the role of this not in the star configuration.
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config NET_STARPOINT
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bool "Point node in star"
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---help---
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The node is a "point" in the star configuration and must send all
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packets to the star hub node.
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config NET_STARHUB
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bool "Hub node of star"
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select NET_IPFORWARD
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---help---
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This is the "hub" node in the star configurations. It will receive
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packets packets from all "point" nodes and perform L2 forwarding of
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the packets that are not destined for this node.
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endchoice # Node role
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endmenu # Network Topologies
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source "net/route/Kconfig"
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endif # NET
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