On 1/9/18 7:40 AM, Ido Schimmel wrote: > The use of hash-threshold instead of modulo-N makes it trivial to add > support for non-equal-cost multipath. > > Instead of dividing the multipath hash function's output space equally > between the nexthops, each nexthop is assigned a region size which is > proportional to its weight. > > Signed-off-by: Ido Schimmel <ido...@mellanox.com> > --- > include/net/ip6_fib.h | 1 + > net/ipv6/route.c | 11 +++++++---- > 2 files changed, 8 insertions(+), 4 deletions(-) > > diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h > index 97cd05d87780..34ec321d6a03 100644 > --- a/include/net/ip6_fib.h > +++ b/include/net/ip6_fib.h > @@ -171,6 +171,7 @@ struct rt6_info { > u32 rt6i_metric; > u32 rt6i_pmtu; > /* more non-fragment space at head required */ > + int rt6i_nh_weight; > unsigned short rt6i_nfheader_len; > u8 rt6i_protocol; > u8 exception_bucket_flushed:1,
Since dst is cacheline aligned there is a hole after rt6i_nh_flags. In patch 1 you put rt6i_nh_upper_bound in that hole. Putting the weight there too keeps those variables together as well as using the open space.