216 lines
6.5 KiB
Plaintext
216 lines
6.5 KiB
Plaintext
#
|
|
# For a description of the syntax of this configuration file,
|
|
# see the file kconfig-language.txt in the NuttX tools repository.
|
|
#
|
|
|
|
menu "TCP/IP Networking"
|
|
|
|
config NET_TCP
|
|
bool "TCP/IP Networking"
|
|
default n
|
|
select NET_READAHEAD if !NET_TCP_NO_STACK
|
|
depends on SCHED_WORKQUEUE
|
|
---help---
|
|
Enable or disable TCP networking support.
|
|
|
|
config NET_TCP_NO_STACK
|
|
bool "Disable TCP/IP Stack"
|
|
default n
|
|
select NET_TCP
|
|
---help---
|
|
Build without TCP/IP stack even if TCP networking support enabled.
|
|
|
|
if NET_TCP && !NET_TCP_NO_STACK
|
|
|
|
config NET_TCP_DELAYED_ACK
|
|
bool "TCP/IP Delayed ACK"
|
|
default n
|
|
---help---
|
|
RFC 1122: A host that is receiving a stream of TCP data segments
|
|
can increase efficiency in both the Internet and the hosts
|
|
by sending fewer than one ACK (acknowledgment) segment per data
|
|
segment received; this is known as a "delayed ACK".
|
|
|
|
TCP should implement a delayed ACK, but an ACK should not be
|
|
excessively delayed; in particular, the delay MUST be less than
|
|
0.5 seconds, and in a stream of full-sized segments there should
|
|
be an ACK for at least every second segments.
|
|
|
|
config NET_TCP_KEEPALIVE
|
|
bool "TCP/IP Keep-alive support"
|
|
default n
|
|
select NET_TCPPROTO_OPTIONS
|
|
---help---
|
|
Enable support for the SO_KEEPALIVE socket option
|
|
|
|
config NET_TCPURGDATA
|
|
bool "Urgent data"
|
|
default n
|
|
---help---
|
|
Determines if support for TCP urgent data notification should be
|
|
compiled in. Urgent data (out-of-band data) is a rarely used TCP feature
|
|
that is very seldom would be required.
|
|
|
|
config NET_TCP_CONNS
|
|
int "Number of TCP/IP connections"
|
|
default 8
|
|
---help---
|
|
Maximum number of TCP/IP connections (all tasks)
|
|
|
|
config NET_TCP_NPOLLWAITERS
|
|
int "Number of TCP poll waiters"
|
|
default 1
|
|
|
|
config NET_TCP_RTO
|
|
int "RTO of TCP/IP connections"
|
|
default 3
|
|
---help---
|
|
RTO of TCP/IP connections (all tasks)
|
|
|
|
config NET_TCP_WAIT_TIMEOUT
|
|
int "TIME_WAIT Length of TCP/IP connections"
|
|
default 120
|
|
---help---
|
|
TIME_WAIT Length of TCP/IP connections (all tasks). In units
|
|
of seconds.
|
|
|
|
config NET_MAX_LISTENPORTS
|
|
int "Number of listening ports"
|
|
default 20
|
|
---help---
|
|
Maximum number of listening TCP/IP ports (all tasks). Default: 20
|
|
|
|
config NET_TCP_FAST_RETRANSMIT
|
|
bool "Enable the Fast Retransmit algorithm"
|
|
default y
|
|
---help---
|
|
RFC2001:
|
|
3. Fast Retransmit
|
|
Modifications to the congestion avoidance algorithm were proposed in
|
|
1990 [3]. Before describing the change, realize that TCP may
|
|
generate an immediate acknowledgment (a duplicate ACK) when an out-
|
|
of-order segment is received (Section 4.2.2.21 of [1], with a note
|
|
that one reason for doing so was for the experimental fast-
|
|
retransmit algorithm). This duplicate ACK should not be delayed.
|
|
The purpose of this duplicate ACK is to let the other end know that a
|
|
segment was received out of order, and to tell it what sequence
|
|
number is expected.
|
|
|
|
Since TCP does not know whether a duplicate ACK is caused by a lost
|
|
segment or just a reordering of segments, it waits for a small number
|
|
of duplicate ACKs to be received. It is assumed that if there is
|
|
just a reordering of the segments, there will be only one or two
|
|
duplicate ACKs before the reordered segment is processed, which will
|
|
then generate a new ACK. If three or more duplicate ACKs are
|
|
received in a row, it is a strong indication that a segment has been
|
|
lost. TCP then performs a retransmission of what appears to be the
|
|
missing segment, without waiting for a retransmission timer to
|
|
expire.
|
|
|
|
config NET_TCP_WINDOW_SCALE
|
|
bool "Enable TCP/IP Window Scale Option"
|
|
default n
|
|
---help---
|
|
RFC1323:
|
|
2. TCP WINDOW SCALE OPTION
|
|
The window scale extension expands the definition of the TCP
|
|
window to 32 bits and then uses a scale factor to carry this 32-
|
|
bit value in the 16-bit Window field of the TCP header (SEG.WND in
|
|
RFC-793).
|
|
|
|
if NET_TCP_WINDOW_SCALE
|
|
|
|
config NET_TCP_WINDOW_SCALE_FACTOR
|
|
int "TCP/IP Window Scale Factor"
|
|
default 0
|
|
---help---
|
|
This is the default value for window scale factor.
|
|
|
|
endif # NET_TCP_WINDOW_SCALE
|
|
|
|
config NET_TCP_NOTIFIER
|
|
bool "Support TCP notifications"
|
|
default n
|
|
depends on SCHED_WORKQUEUE
|
|
select WQUEUE_NOTIFIER
|
|
---help---
|
|
Enable building of TCP notifier logic that will execute a worker
|
|
function on the low priority work queue when read-ahead data
|
|
is available or when a TCP connection is lost. This is is a general
|
|
purpose notifier, but was developed specifically to support poll()
|
|
logic where the poll must wait for these events.
|
|
|
|
config NET_TCP_WRITE_BUFFERS
|
|
bool "Enable TCP/IP write buffering"
|
|
default n
|
|
select NET_WRITE_BUFFERS
|
|
---help---
|
|
Write buffers allows buffering of ongoing TCP/IP packets, providing
|
|
for higher performance, streamed output.
|
|
|
|
You might want to disable TCP/IP write buffering on a highly memory
|
|
memory constrained system where there are no performance issues.
|
|
|
|
if NET_TCP_WRITE_BUFFERS
|
|
|
|
config NET_TCP_NWRBCHAINS
|
|
int "Number of pre-allocated I/O buffer chain heads"
|
|
default 8
|
|
---help---
|
|
These tiny nodes are used as "containers" to support queuing of
|
|
TCP write buffers. This setting will limit the number of TCP write
|
|
operations that can be "in-flight" at any give time. So a good
|
|
choice for this value would be the same as the maximum number of
|
|
TCP connections.
|
|
|
|
config NET_TCP_WRBUFFER_DEBUG
|
|
bool "Force write buffer debug"
|
|
default n
|
|
depends on DEBUG_FEATURES
|
|
select IOB_DEBUG
|
|
---help---
|
|
This option will force debug output from TCP write buffer logic,
|
|
even without network debug output. This is not normally something
|
|
that would want to do but is convenient if you are debugging the
|
|
write buffer logic and do not want to get overloaded with other
|
|
network-related debug output.
|
|
|
|
config NET_TCP_WRBUFFER_DUMP
|
|
bool "Force write buffer dump"
|
|
default n
|
|
depends on DEBUG_NET || NET_TCP_WRBUFFER_DEBUG
|
|
select IOB_DEBUG
|
|
---help---
|
|
Dump the contents of the write buffers. You do not want to do this
|
|
unless you really want to analyze the write buffer transfers in
|
|
detail.
|
|
|
|
endif # NET_TCP_WRITE_BUFFERS
|
|
|
|
config NET_TCPBACKLOG
|
|
bool "TCP/IP backlog support"
|
|
default n
|
|
---help---
|
|
Incoming connections pend in a backlog until accept() is called.
|
|
The size of the backlog is selected when listen() is called.
|
|
|
|
if NET_TCPBACKLOG
|
|
|
|
config NET_TCPBACKLOG_CONNS
|
|
int "TCP backlog conns threshold"
|
|
default 8
|
|
---help---
|
|
Maximum number of TCP backlog connections (all tasks).
|
|
|
|
endif # NET_TCPBACKLOG
|
|
|
|
config NET_SENDFILE
|
|
bool "Optimized network sendfile()"
|
|
default n
|
|
---help---
|
|
Support larger, higher performance sendfile() for transferring
|
|
files out a TCP connection.
|
|
|
|
endif # NET_TCP && !NET_TCP_NO_STACK
|
|
endmenu # TCP/IP Networking
|