Hardware supports multipath selection using the standard L4 5-tuple instead of just L3 and the flow label. In addition, some network operators prefer IPv6 path selection to use the 5-tuple. To that end, add support to IPv6 for multipath hash policy similar to bf4e0a3db97eb ("net: ipv4: add support for ECMP hash policy choice"). The default is still L3 which covers source and destination addresses along with flow label and IPv6 protocol.
A separate sysctl is added for IPv6, allowing IPv4 and IPv6 to use different algorithms if desired. The first 2 patches modify the IPv4 variant so that at the end of the patch set the ipv4 and ipv6 implementations are direct parallels. Patch 3 refactors the existing rt6_multipath_hash in preparation for adding the policy option. Patch 4 renames the existing netevent to have IPv4 in the name so ipv4 changes can be distinguished from IPv6 if the netevent handler cares. Patch 5 adds the L4 hash support. Patch 6 adds the hook for the netevent to the spectrum driver to update the ASIC. Patch 7 removes no longer used code. David Ahern (7): net/ipv4: Pass net to fib_multipath_hash instead of fib_info net: Align ip_multipath_l3_keys and ip6_multipath_l3_keys net/ipv6: Make rt6_multipath_hash similar to fib_multipath_hash net: Rename NETEVENT_MULTIPATH_HASH_UPDATE net/ipv6: Add support for path selection using hash of 5-tuple mlxsw: spectrum_router: Add support for ipv6 hash policy update net: Remove unused get_hash_from_flow functions Documentation/networking/ip-sysctl.txt | 7 +++ .../net/ethernet/mellanox/mlxsw/spectrum_router.c | 13 ++++- include/net/flow.h | 15 ----- include/net/ip6_route.h | 3 +- include/net/ip_fib.h | 2 +- include/net/netevent.h | 3 +- include/net/netns/ipv6.h | 1 + net/core/flow_dissector.c | 16 ------ net/ipv4/fib_semantics.c | 2 +- net/ipv4/route.c | 25 +++++---- net/ipv4/sysctl_net_ipv4.c | 2 +- net/ipv6/icmp.c | 2 +- net/ipv6/route.c | 64 ++++++++++++++++++---- net/ipv6/sysctl_net_ipv6.c | 26 +++++++++ 14 files changed, 118 insertions(+), 63 deletions(-) -- 2.11.0