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net/Kconfig: IP forwarding no long depends on only IPv6. Also update Kconfig comments.

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This commit is contained in:
Gregory Nutt 2017-07-05 16:35:14 -06:00
parent b297066eb9
commit 24e9647156
1 changed files with 7 additions and 12 deletions
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19
net/Kconfig
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@ -288,24 +288,18 @@ source "net/sixlowpan/Kconfig"
config NET_IPFORWARD config NET_IPFORWARD
bool "Enable L2 forwarding" bool "Enable L2 forwarding"
default n default n
depends on NET_IPv6
---help--- ---help---
Enable forwarding of IPv6 packets. Packets received with IPv6 Enable forwarding of packets. Packets received with IP addresses
addresses which are not supported by this platform will be forwarded that are not supported by this platform will be forwarded to the
to the appropriate network device. Routing table support may be appropriate network device. Routing table support may be required.
required.
NOTE: L2 forwarding only supported for IPv6. There is no technical
reason why IPv4 forwarding has not been implemented, it just has
not yet been done.
config NET_IPFORWARD_NSTRUCT config NET_IPFORWARD_NSTRUCT
int "Number of pre-allocated forwarding structures" int "Number of pre-allocated forwarding structures"
default 4 default 4
depends on NET_IPFORWARD && CONFIG_NETDEV_MULTINIC depends on NET_IPFORWARD && CONFIG_NETDEV_MULTINIC
---help--- ---help---
When packets are forward from on device to another, a structure must When packets are forwarded from on device to another, a structure
be allocated to hold the state of forwarding across several must be allocated to hold the state of forwarding across several
asynchronous events. Those structures are pre-allocated for asynchronous events. Those structures are pre-allocated for
minimal, deterministic performance and to prevent hogging of memory minimal, deterministic performance and to prevent hogging of memory
(of course, that means that this value must be carefully selected (of course, that means that this value must be carefully selected
@ -314,7 +308,8 @@ config NET_IPFORWARD_NSTRUCT
NOTE: This setting effectively puts a maximum on the number of NOTE: This setting effectively puts a maximum on the number of
packets that may be waiting to be forwarded from one network device packets that may be waiting to be forwarded from one network device
to another. to another. CONFIG_IOB_NBUFFERS also limits the forward because the
payload of the packet (up to the MSS) is retain in IOBs.
endmenu # Internet Protocol Selection endmenu # Internet Protocol Selection