ec3eff57e0
Up until now, Zephyr has patched Kconfig to use the last 'default' with
a satisfied condition, instead of the first one. I'm not sure why the
patch was added (it predates Kconfiglib), but I suspect it's related to
Kconfig.defconfig files.
There are at least three problems with the patch:
1. It's inconsistent with how Kconfig works in other projects, which
might confuse newcomers.
2. Due to oversights, earlier 'range' properties are still preferred,
as well as earlier 'default' properties on choices.
In addition to being inconsistent, this makes it impossible to
override 'range' properties and choice 'default' properties if the
base definition of the symbol/choice already has 'range'/'default'
properties.
I've seen errors caused by the inconsistency, and I suspect there
are more.
3. A fork of Kconfiglib that adds the patch needs to be maintained.
Get rid of the patch and go back to standard Kconfig behavior, as
follows:
1. Include the Kconfig.defconfig files first instead of last in
Kconfig.zephyr.
2. Include boards/Kconfig and arch/<arch>/Kconfig first instead of
last in arch/Kconfig.
3. Include arch/<arch>/soc/*/Kconfig first instead of last in
arch/<arch>/Kconfig.
4. Swap a few other 'source's to preserve behavior for some scattered
symbols with multiple definitions.
Swap 'source's in some no-op cases too, where it might match the
intent.
5. Reverse the defaults on symbol definitions that have more than one
default.
Skip defaults that are mutually exclusive, e.g. where each default
has an 'if <some board>' condition. They are already safe.
6. Remove the prefer-later-defaults patch from Kconfiglib.
Testing was done with a Python script that lists all Kconfig
symbols/choices with multiple defaults, along with a whitelist of fixed
symbols. The script also verifies that there are no "unreachable"
defaults hidden by defaults without conditions
As an additional test, zephyr/.config was generated before and after the
change for several samples and checked to be identical (after sorting).
This commit includes some default-related cleanups as well:
- Simplify some symbol definitions, e.g. where a default has 'if FOO'
when the symbol already has 'depends on FOO'.
- Remove some redundant 'default ""' for string symbols. This is the
implicit default.
Piggyback fixes for swapped ranges on BT_L2CAP_RX_MTU and
BT_L2CAP_TX_MTU (caused by confusing inconsistency).
Piggyback some fixes for style nits too, e.g. unindented help texts.
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
475 lines
14 KiB
Text
475 lines
14 KiB
Text
# Kconfig - IP stack config
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#
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# Copyright (c) 2016 Intel Corporation.
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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menu "IP stack"
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# Hidden option
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config NET_RAW_MODE
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bool
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help
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This is a very specific option used to built only the very minimal
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part of the net stack in order to get network drivers working without
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any net stack above: core, L2 etc... Basically this will build only
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net_pkt part. It is currently used only by IEEE 802.15.4 drivers,
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though any type of net drivers could use it.
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if !NET_RAW_MODE
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config NET_INIT_PRIO
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int
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default 90
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help
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Network initialization priority level. This number tells how
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early in the boot the network stack is initialized.
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source "subsys/net/ip/Kconfig.debug"
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source "subsys/net/ip/Kconfig.ipv6"
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source "subsys/net/ip/Kconfig.ipv4"
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config NET_SHELL
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bool "Enable network shell utilities"
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select CONSOLE_SHELL
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help
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Activate shell module that provides network commands like
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ping to the console.
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config NET_TC_TX_COUNT
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int "How many Tx traffic classes to have for each network device"
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default 1
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range 1 8
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help
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Define how many Tx traffic classes (queues) the system should have
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when sending a network packet. The network packet priority can then
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be mapped to this traffic class so that higher prioritized packets
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can be processed before lower prioritized ones. Each queue is handled
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by a separate thread which will need RAM for stack space.
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Only increase the value from 1 if you really need this feature.
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The default value is 1 which means that all the network traffic is
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handled equally. In this implementation, the higher traffic class
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value corresponds to lower thread priority.
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config NET_TC_RX_COUNT
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int "How many Rx traffic classes to have for each network device"
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default 1
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range 1 8
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help
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Define how many Rx traffic classes (queues) the system should have
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when receiving a network packet. The network packet priority can then
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be mapped to this traffic class so that higher prioritized packets
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can be processed before lower prioritized ones. Each queue is handled
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by a separate thread which will need RAM for stack space.
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Only increase the value from 1 if you really need this feature.
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The default value is 1 which means that all the network traffic is
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handled equally. In this implementation, the higher traffic class
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value corresponds to lower thread priority.
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choice
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prompt "Priority to traffic class mapping"
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help
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Select mapping to use to map network packet priorities to traffic
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classes.
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config NET_TC_MAPPING_STRICT
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bool "Strict priority mapping"
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help
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This is the recommended default priority to traffic class mapping.
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Use it for implementations that do not support the credit-based
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shaper transmission selection algorithm.
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See 802.1Q, chapter 8.6.6 for more information.
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config NET_TC_MAPPING_SR_CLASS_A_AND_B
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bool "SR class A and class B mapping"
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depends on NET_TC_TX_COUNT >= 2
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depends on NET_TC_RX_COUNT >= 2
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help
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This is the recommended priority to traffic class mapping for a
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system that supports SR (Stream Reservation) class A and SR class B.
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See 802.1Q, chapter 34.5 for more information.
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config NET_TC_MAPPING_SR_CLASS_B_ONLY
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bool "SR class B only mapping"
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depends on NET_TC_TX_COUNT >= 2
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depends on NET_TC_RX_COUNT >= 2
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help
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This is the recommended priority to traffic class mapping for a
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system that supports SR (Stream Reservation) class B only.
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See 802.1Q, chapter 34.5 for more information.
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endchoice
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config NET_TX_DEFAULT_PRIORITY
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int "Default network packet priority if none have been set"
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default 1
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range 0 7
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help
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What is the default network packet priority if user has not specified
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one. The value 0 means lowest priority and 7 is the highest.
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config NET_IP_ADDR_CHECK
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bool "Check IP address validity before sending IP packet"
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default y
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help
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Check that either the source or destination address is
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correct before sending either IPv4 or IPv6 network packet.
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config NET_MAX_ROUTERS
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int "How many routers are supported"
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default 2 if NET_IPV4 && NET_IPV6
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default 1 if NET_IPV4 && !NET_IPV6
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default 1 if !NET_IPV4 && NET_IPV6
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range 1 254
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help
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The value depends on your network needs.
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# Normally the route support is enabled by RPL or similar technology
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# that needs to use the routing infrastructure.
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config NET_ROUTE
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bool
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depends on NET_IPV6_NBR_CACHE
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default y if NET_IPV6_NBR_CACHE
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config NET_ROUTING
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bool "IP routing between interfaces"
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depends on NET_ROUTE
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help
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Allow IPv6 routing between different network interfaces and
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technologies.
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config NET_MAX_ROUTES
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int "Max number of routing entries stored."
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default NET_IPV6_MAX_NEIGHBORS
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depends on NET_ROUTE
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help
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This determines how many entries can be stored in routing table.
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config NET_MAX_NEXTHOPS
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int "Max number of next hop entries stored."
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default NET_MAX_ROUTES
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depends on NET_ROUTE
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help
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This determines how many entries can be stored in nexthop table.
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config NET_ROUTE_MCAST
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bool
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depends on NET_ROUTE
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config NET_MAX_MCAST_ROUTES
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int "Max number of multicast routing entries stored."
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default 1
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depends on NET_ROUTE_MCAST
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help
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This determines how many entries can be stored in multicast
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routing table.
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config NET_TCP
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bool "Enable TCP"
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help
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The value depends on your network needs.
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config NET_TCP_CHECKSUM
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bool "Check TCP checksum"
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default y
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depends on NET_TCP
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help
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Enables TCP handler to check TCP checksum. If the checksum is invalid,
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then the packet is discarded.
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config NET_DEBUG_TCP
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bool "Debug TCP"
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depends on NET_TCP && NET_LOG
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help
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Enables TCP handler output debug messages
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config NET_TCP_BACKLOG_SIZE
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int "Number of simultaneous incoming TCP connections"
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depends on NET_TCP
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default 1
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range 1 128
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help
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The number of simultaneous TCP connection attempts, i.e. outstanding
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TCP connections waiting for initial ACK.
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config NET_TCP_TIME_WAIT_DELAY
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int "How long to wait in TIME_WAIT state (in milliseconds)"
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depends on NET_TCP
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default 250
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help
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To avoid a (low-probability) issue when delayed packets from
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previous connection get delivered to next connection reusing
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the same local/remote ports, RFC 793 (TCP) suggests to keep
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an old, closed connection in a special "TIME_WAIT" state for
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the duration of 2*MSL (Maximum Segment Lifetime). The RFC
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suggests to use MSL of 2 minutes, but notes "This is an
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engineering choice, and may be changed if experience indicates
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it is desirable to do so." For low-resource systems, having
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large MSL may lead to quick resource exhaustion (and related
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DoS attacks). At the same time, the issue of packet misdelivery
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is largely alleviated in the modern TCP stacks by using random,
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non-repeating port numbers and initial sequence numbers. Due
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to this, Zephyr uses much lower value of 250ms by default.
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Value of 0 disables TIME_WAIT state completely.
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config NET_TCP_ACK_TIMEOUT
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int "How long to wait for ACK (in milliseconds)"
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depends on NET_TCP
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default 1000
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range 1 2147483647
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help
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This value affects the timeout when waiting ACK to arrive in
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various TCP states. The value is in milliseconds. Note that
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having a very low value here could prevent connectivity.
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config NET_TCP_INIT_RETRANSMISSION_TIMEOUT
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int "Initial value of Retransmission Timeout (RTO) (in milliseconds)"
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depends on NET_TCP
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default 200
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range 100 60000
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help
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This value affects the timeout between initial retransmission
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of TCP data packets. The value is in milliseconds.
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config NET_TCP_RETRY_COUNT
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int "Maximum number of TCP segment retransmissions"
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depends on NET_TCP
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default 9
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help
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The following formula can be used to determine the time (in ms)
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that a segment will be be buffered awaiting retransmission:
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n=NET_TCP_RETRY_COUNT
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Sum((1<<n) * NET_TCP_INIT_RETRANSMISSION_TIMEOUT)
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n=0
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With the default value of 9, the IP stack will try to
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retransmit for up to 1:42 minutes. This is as close as possible
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to the minimum value recommended by RFC1122 (1:40 minutes).
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Only 5 bits are dedicated for the retransmission count, so accepted
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values are in the 0-31 range. It's highly recommended to not go
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below 9, though.
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Should a retransmission timeout occur, the receive callback is
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called with -ECONNRESET error code and the context is dereferenced.
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config NET_UDP
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bool "Enable UDP"
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default y
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help
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The value depends on your network needs.
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config NET_UDP_CHECKSUM
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bool "Check UDP checksum"
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default y
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depends on NET_UDP
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help
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Enables UDP handler to check UDP checksum. If the checksum is invalid,
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then the packet is discarded.
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config NET_DEBUG_UDP
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bool "Debug UDP"
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depends on NET_UDP && NET_LOG
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help
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Enables UDP handler output debug messages
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config NET_MAX_CONN
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int "How many network connections are supported"
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depends on NET_UDP || NET_TCP
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default 8 if NET_IPV6 && NET_IPV4
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default 4
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help
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The value depends on your network needs. The value
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should include both UDP and TCP connections.
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config NET_CONN_CACHE
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bool "Cache network connections"
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depends on NET_UDP || NET_TCP
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help
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Caching takes slight more memory but will speedup connection
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handling of UDP and TCP connections.
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config NET_MAX_CONTEXTS
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int "Number of network contexts to allocate"
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default 6
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help
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Each network context is used to describe a network 5-tuple that
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is used when listening or sending network traffic. This is very
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similar as one could call a network socket in some other systems.
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config NET_CONTEXT_NET_PKT_POOL
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bool "Enable net_buf TX pool / context"
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default y if NET_TCP && NET_6LO
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help
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If enabled, then it is possible to fine-tune network packet pool
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for each context when sending network data. If this setting is
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enabled, then you should define the context pools in your application
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using NET_PKT_TX_POOL_DEFINE() and NET_PKT_DATA_POOL_DEFINE()
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macros and tie these pools to desired context using the
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net_context_setup_pools() function.
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config NET_CONTEXT_SYNC_RECV
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bool "Support synchronous functionality in net_context_recv() API"
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default y
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help
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You can disable sync support to save some memory if you are calling
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net_context_recv() in async way only when timeout is set to 0.
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config NET_CONTEXT_CHECK
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bool "Check options when calling various net_context functions"
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default y
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help
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If you know that the options passed to net_context...() functions
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are ok, then you can disable the checks to save some memory.
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config NET_CONTEXT_PRIORITY
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bool "Add priority support to net_context"
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help
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It is possible to prioritize network traffic. This requires
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also traffic class support to work as expected.
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config NET_TEST
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bool "Network Testing"
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help
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Used for self-contained networking tests that do not require a
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network device.
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config NET_SLIP_TAP
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bool "TAP SLIP driver"
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select SLIP
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select UART_PIPE
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select UART_INTERRUPT_DRIVEN
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select SLIP_TAP
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default y if (QEMU_TARGET && !NET_TEST && !NET_L2_BT)
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help
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SLIP TAP support is necessary when testing with QEMU. The host
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needs to have tunslip6 with TAP support running in order to
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communicate via the SLIP driver. See net-tools project at
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https://github.com/zephyrproject-rtos/net-tools for more details.
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config NET_TRICKLE
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bool "Enable Trickle library"
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help
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Normally this is enabled automatically if needed,
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so say 'n' if unsure.
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config NET_DEBUG_TRICKLE
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bool "Debug Trickle algorithm"
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depends on NET_TRICKLE && NET_LOG
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help
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Enables Trickle library output debug messages
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endif # NET_RAW_MODE
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config NET_PKT_RX_COUNT
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int "How many packet receives can be pending at the same time"
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default 14 if NET_L2_ETHERNET
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default 4
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help
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Each RX buffer will occupy smallish amount of memory.
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See include/net/net_pkt.h and the sizeof(struct net_pkt)
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config NET_PKT_TX_COUNT
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int "How many packet sends can be pending at the same time"
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default 14 if NET_L2_ETHERNET
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default 4
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help
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Each TX buffer will occupy smallish amount of memory.
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See include/net/net_pkt.h and the sizeof(struct net_pkt)
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config NET_BUF_RX_COUNT
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int "How many network buffers are allocated for receiving data"
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default 36 if NET_L2_ETHERNET
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default 16
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help
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Each data buffer will occupy CONFIG_NET_BUF_DATA_SIZE + smallish
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header (sizeof(struct net_buf)) amount of data.
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config NET_BUF_TX_COUNT
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int "How many network buffers are allocated for sending data"
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default 36 if NET_L2_ETHERNET
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default 16
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help
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Each data buffer will occupy CONFIG_NET_BUF_DATA_SIZE + smallish
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header (sizeof(struct net_buf)) amount of data.
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config NET_BUF_DATA_SIZE
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int "Size of each network data fragment"
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default 125 if NET_L2_IEEE802154
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default 128
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help
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This value tells what is the size of the data fragment that is
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received from the network.
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Example: For IEEE 802.15.4, the network packet is 127 bytes long,
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which leaves in worst case 81 bytes for user data (MTU).
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In order to be able to receive at least full IPv6 packet which
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has a size of 1280 bytes, the one should allocate 16 fragments here.
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choice
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prompt "Default Network Interface"
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default NET_DEFAULT_IF_FIRST
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help
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If system has multiple interfaces enabled, then user shall be able
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to choose default interface. Otherwise first interface will be the
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default interface.
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config NET_DEFAULT_IF_FIRST
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bool "First available interface"
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config NET_DEFAULT_IF_ETHERNET
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bool "Ethernet"
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depends on NET_L2_ETHERNET
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config NET_DEFAULT_IF_BLUETOOTH
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bool "Bluetooth"
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depends on NET_L2_BT
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config NET_DEFAULT_IF_IEEE802154
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bool "IEEE 802.15.4"
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depends on NET_L2_IEEE802154
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config NET_DEFAULT_IF_OFFLOAD
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bool "Offloaded interface"
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depends on NET_OFFLOAD
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config NET_DEFAULT_IF_DUMMY
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bool "Dummy testing interface"
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depends on NET_L2_DUMMY
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endchoice
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config NET_PKT_TIMESTAMP
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bool "Enable network packet timestamp support"
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help
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Enable network packet timestamp support. This is needed for
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example in gPTP which needs to know how long it takes to send
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a network packet.
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config NET_PKT_TIMESTAMP_STACK_SIZE
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int "Timestamp thread stack size"
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default 1024
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depends on NET_PKT_TIMESTAMP
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help
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Set the timestamp thread stack size in bytes. The timestamp
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thread waits for timestamped TX frames and calls registered
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callbacks.
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config NET_PROMISCUOUS_MODE
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bool "Enable promiscuous mode support [EXPERIMENTAL]"
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select NET_MGMT
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select NET_MGMT_EVENT
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select NET_L2_ETHERNET_MGMT if NET_L2_ETHERNET
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help
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Enable promiscuous mode support. This only works if the network
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device driver supports promiscuous mode. The user application
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also needs to read the promiscuous mode data.
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source "subsys/net/ip/Kconfig.stack"
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source "subsys/net/ip/Kconfig.mgmt"
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source "subsys/net/ip/Kconfig.rpl"
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source "subsys/net/ip/Kconfig.stats"
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endmenu
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