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60 lines
2.3 KiB
Text
60 lines
2.3 KiB
Text
#
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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 NET_IPFORWARD
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bool "Enable L2 forwarding"
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default n
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---help---
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Enable forwarding of packets. Packets received with IP addresses
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that are not supported by this platform will be forwarded to the
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appropriate network device. Routing table support may be required.
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config NET_IPFORWARD_BROADCAST
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bool "Forward broadcast/multicast packets"
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default n
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depends on NET_IPFORWARD
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---help---
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If selected, broadcast packets received on one network device will
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be forwarded though other network devices.
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config NET_IPFORWARD_NSTRUCT
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int "Number of pre-allocated forwarding structures"
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default 4
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depends on NET_IPFORWARD
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---help---
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When packets are forwarded from on device to another, a structure
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must be allocated to hold the state of forwarding across several
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asynchronous events. Those structures are pre-allocated for
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minimal, deterministic performance and to prevent hogging of memory
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(of course, that means that this value must be carefully selected
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for your application). This setting defines the number of such pre-
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allocated structures.
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NOTE: This setting effectively puts a maximum on the number of
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packets that may be waiting to be forwarded from one network device
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to another. CONFIG_IOB_NBUFFERS also limits the forward because the
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payload of the packet (up to the MSS) is retain in IOBs.
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WARNING: DO NOT set this setting to a value greater than or equal to
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CONFIG_IOB_NBUFFERS, otherwise it may consume all the IOB and let
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netdev fail to work.
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config NET_IPFORWARD_ALLOC_STRUCT
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int "Dynamic forwarding structures allocation"
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default 1
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---help---
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When set to 0 all dynamic allocations are disabled
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When set to 1 a new forwarding structure will be allocated every
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time, and it will be free'd when no longer needed.
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Setting this to 2 or more will allocate the forwarding structures
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in batches (with batch size equal to this config). When a I/O buffer
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chain head is no longer needed, it will be returned to the free
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forwarding structures pool, and it will never be deallocated!
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Note: maximum number of allocated forwarding structures is limited
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to CONFIG_IOB_NBUFFERS - CONFIG_IOB_THROTTLE to avoid consuming all
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the IOBs.
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