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Enable ROUTE_MPATH support in GENERIC kernels.

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Ability to load-balance traffic over multiple path is a must-have thing for routers.
It may be used by the servers to balance outgoing traffic over multiple default gateways.

The previous implementation, RADIX_MPATH stayed in the shadow for too long.
It was not well maintained, which lead us to a vicious circle - people were using
 non-contiguous mask or firewalls to achieve similar goals. As a result, some routing
 daemons implementation still don't have multipath support enabled for FreeBSD.

Turning on ROUTE_MPATH by default would fix it. It will allow to reduce networking
 feature gap to other operating systems. Linux and OpenBSD enabled similar support
 at least 5 years ago.

ROUTE_MPATH does not consume memory unless actually used. It enables around ~1k LOC.

It does not bring any behaviour changes for userland.
Additionally, feature is (temporarily) turned off by the net.route.multipath sysctl
 defaulting to 0.

Differential Revision:	https://reviews.freebsd.org/D27428
This commit is contained in:
Alexander V. Chernikov 2020-12-14 22:23:08 +00:00
parent 3696db923f
commit d5fe384b4d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=368648
5 changed files with 5 additions and 0 deletions
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1
sys/amd64/conf/GENERIC
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@ -31,6 +31,7 @@ options VIMAGE # Subsystem virtualization, e.g. VNET
options INET # InterNETworking
options INET6 # IPv6 communications protocols
options IPSEC_SUPPORT # Allow kldload of ipsec and tcpmd5
options ROUTE_MPATH # Multipath routing support
options TCP_OFFLOAD # TCP offload
options TCP_BLACKBOX # Enhanced TCP event logging
options TCP_HHOOK # hhook(9) framework for TCP

1
sys/arm64/conf/GENERIC
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@ -30,6 +30,7 @@ options PREEMPTION # Enable kernel thread preemption
options VIMAGE # Subsystem virtualization, e.g. VNET
options INET # InterNETworking
options INET6 # IPv6 communications protocols
options ROUTE_MPATH # Multipath routing support
options IPSEC_SUPPORT # Allow kldload of ipsec and tcpmd5
options TCP_HHOOK # hhook(9) framework for TCP
options TCP_OFFLOAD # TCP offload

1
sys/i386/conf/GENERIC
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@ -32,6 +32,7 @@ options VIMAGE # Subsystem virtualization, e.g. VNET
options INET # InterNETworking
options INET6 # IPv6 communications protocols
options IPSEC_SUPPORT # Allow kldload of ipsec and tcpmd5
options ROUTE_MPATH # Multipath routing support
options TCP_HHOOK # hhook(9) framework for TCP
options TCP_OFFLOAD # TCP offload
options SCTP_SUPPORT # Allow kldload of SCTP

1
sys/powerpc/conf/GENERIC64
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@ -42,6 +42,7 @@ options VIMAGE # Subsystem virtualization, e.g. VNET
options INET #InterNETworking
options INET6 #IPv6 communications protocols
options IPSEC_SUPPORT # Allow kldload of ipsec and tcpmd5
options ROUTE_MPATH # Multipath routing support
options TCP_OFFLOAD # TCP offload
options TCP_BLACKBOX # Enhanced TCP event logging
options TCP_HHOOK # hhook(9) framework for TCP

1
sys/riscv/conf/GENERIC
View File

@ -31,6 +31,7 @@ options INET # InterNETworking
options INET6 # IPv6 communications protocols
options TCP_HHOOK # hhook(9) framework for TCP
options IPSEC_SUPPORT # Allow kldload of ipsec and tcpmd5
options ROUTE_MPATH # Multipath routing support
options TCP_OFFLOAD # TCP offload
options SCTP_SUPPORT # Allow kldload of SCTP
options FFS # Berkeley Fast Filesystem