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Date:	Tue,  2 Oct 2012 18:02:46 +0200
From:	Nicolas Dichtel <>
Subject: [PATCH net-next v6 0/1] Add support of ECMPv6

Here is a proposal to add the support of ECMPv6. The previous patch
from Vincent against iproute2 can be used, but a little other patch is needed
too, see

If the kernel patch is approved, I can submit formally the patch for

Here is an example of a command to add an ECMP route:
$ ip -6 route add 3ffe:304:124:2306::/64 \
	nexthop via fe80::230:1bff:feb4:e05c dev eth0 \
	nexthop via fe80::230:1bff:feb4:dd4f dev eth0

But note that this command is a shortcut and previous patches are not
mandatory to set ECMP routes. The following commands can be used too:
$ ip -6 route add 3ffe:304:124:2306::/64 via fe80::230:1bff:feb4:dd4f dev
$ ip -6 route append 3ffe:304:124:2306::/64 via fe80::230:1bff:feb4:e05c dev

Here is an example of a dump:
$ ip -6 route | grep 3ffe:304:124:2306::/64
3ffe:304:124:2306::/64 via fe80::230:1bff:feb4:dd4f dev eth0  metric 1024
3ffe:304:124:2306::/64 via fe80::230:1bff:feb4:e05c dev eth0  metric 1024

v6: be more verbose in commitlog
    add some helpers in ip6_fib.h to avoid to have too many ifdef block in the
    invert fc_mp_len and fc_mp in struct fib6_config to avoid a hole on 64bits

v5: to minimize the patch and ease its integration, remove roundrobin and random
    algorithms for route selection. It will be possible to add new algorithms
    through rt6_info_hashfn() when the basic support of ECMP is integrated.

v4: remove compilation options to choose multipath algorithm for next hop
    selection. Now the choice can be done at run time via

v3: rebase after updating net-next

    use flowlabel in the hash function
    add reference to RFC
    fix a small identation issue
    remove "If unsure, say N." from the help of CONFIG_IPV6_MULTIPATH

Comments are welcome.


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