196 lines
6.0 KiB
Plaintext
196 lines
6.0 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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menu "TCP/IP Networking"
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config NET_TCP
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bool "TCP/IP Networking"
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default n
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---help---
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Enable or disable TCP networking support.
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config NET_TCP_NO_STACK
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bool "Disable TCP/IP Stack"
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default n
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select NET_TCP
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---help---
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Build without TCP/IP stack even if TCP networking support enabled.
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if NET_TCP && !NET_TCP_NO_STACK
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config NET_TCPURGDATA
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bool "Urgent data"
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default n
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---help---
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Determines if support for TCP urgent data notification should be
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compiled in. Urgent data (out-of-band data) is a rarely used TCP feature
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that is very seldom would be required.
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config NET_TCP_REASSEMBLY
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bool "TCP reassembly"
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default n
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depends on EXPERIMENTAL
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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 the
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reassembly buffer and the reassembly code size is approximately 700
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bytes. The reassembly buffer is of the same size as the d_buf buffer
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(configured by CONFIG_NET_xxx_MTU).
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Note: IP packet reassembly is not heavily tested (and, hence,
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EXPERIMENTAL).
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if NET_TCP_REASSEMBLY
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config NET_TCP_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_TCP_REASSEMBLY
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config NET_TCP_CONNS
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int "Number of TCP/IP connections"
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default 8
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---help---
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Maximum number of TCP/IP connections (all tasks)
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config NET_MAX_LISTENPORTS
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int "Number of listening ports"
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default 20
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---help---
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Maximum number of listening TCP/IP ports (all tasks). Default: 20
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config NET_TCP_READAHEAD
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bool "Enable TCP/IP read-ahead buffering"
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default y
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select MM_IOB
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---help---
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Read-ahead buffers allows buffering of TCP/IP packets when there is no
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receive in place to catch the TCP packet. In that case, the packet
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will be retained in the NuttX read-ahead buffers.
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You might want to disable TCP/IP read-ahead buffering on a highly
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memory constrained system that does not have any TCP/IP packet rate
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issues. But, if disabled, there will probably be more packet
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retransmissions or even packet loss.
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Make sure that you check the setting in the I/O Buffering menu.
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These settings are critical to the reasonable operation of read-
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ahead buffering.
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if NET_TCP_READAHEAD
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endif # NET_TCP_READAHEAD
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config NET_TCP_WRITE_BUFFERS
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bool "Enable TCP/IP write buffering"
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default n
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select MM_IOB
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---help---
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Write buffers allows buffering of ongoing TCP/IP packets, providing
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for higher performance, streamed output.
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You might want to disable TCP/IP write buffering on a highly memory
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memory constrained system where there are no performance issues.
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if NET_TCP_WRITE_BUFFERS
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config NET_TCP_NWRBCHAINS
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int "Number of pre-allocated I/O buffer chain heads"
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default 8
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---help---
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These tiny nodes are used as "containers" to support queueing of
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TCP write buffers. This setting will limit the number of TCP write
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operations that can be "in-flight" at any give time. So a good
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choice for this value would be the same as the maximum number of
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TCP connections.
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config NET_TCP_WRBUFFER_DEBUG
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bool "Force write buffer debug"
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default n
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depends on DEBUG_FEATURES
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select IOB_DEBUG
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---help---
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This option will force debug output from TCP write buffer logic,
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even without network debug output. This is not normally something
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that would want to do but is convenient if you are debugging the
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write buffer logic and do not want to get overloaded with other
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network-related debug output.
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config NET_TCP_WRBUFFER_DUMP
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bool "Force write buffer dump"
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default n
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depends on DEBUG_NET || NET_TCP_WRBUFFER_DEBUG
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select IOB_DEBUG
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---help---
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Dump the contents of the write buffers. You do not want to do this
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unless you really want to analyze the write buffer transfers in
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detail.
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endif # NET_TCP_WRITE_BUFFERS
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config NET_TCP_RECVDELAY
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int "TCP Rx delay"
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default 0
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---help---
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If NET_TCP_READAHEAD_BUFFERS is undefined, then there will be no buffering
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of TCP/IP packets: Any TCP/IP packet received will be ACKed, but its contents
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will be dropped in the bit-bucket.
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One low-performance option is delay for a short period of time after a
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TCP/IP packet is received to see if another comes right behind it. Then
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the packet data from both can be combined. This option only makes since
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if performance is not an issue and you need to handle short bursts of
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small, back-to-back packets. The delay is in units of deciseconds.
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config NET_TCPBACKLOG
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bool "TCP/IP backlog support"
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default n
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---help---
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Incoming connections pend in a backlog until accept() is called.
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The size of the backlog is selected when listen() is called.
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config NET_TCP_SPLIT
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bool "Enable packet splitting"
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default n
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depends on !NET_TCP_WRITE_BUFFERS
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---help---
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send() will not return until the transfer has been ACKed by the
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recipient. But under RFC 1122, the host need not ACK each packet
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immediately; the host may wait for 500 MS before ACKing. This
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combination can cause very slow performance with small transfers are
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made to an RFC 1122 client. However, the RFC 1122 must ACK at least
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every second (odd) packet.
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This option enables logic to trick the RFC 1122 host be exploiting
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this last RFC 1122 requirement: If an odd number of packets were to
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be sent, then send() will split the last even packet to guarantee
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that an even number of packets will be sent and the RFC 1122 host
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will ACK the final packet immediately.
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if NET_TCP_SPLIT
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config NET_TCP_SPLIT_SIZE
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int "Split size threshold"
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default 40
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---help---
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Packets of this size or smaller than this will not be split.
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endif # NET_TCP_SPLIT
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config NET_SENDFILE
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bool "Optimized network sendfile()"
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default n
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---help---
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Support larger, higher performance sendfile() for transferring
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files out a TCP connection.
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endif # NET_TCP && !NET_TCP_NO_STACK
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endmenu # TCP/IP Networking
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