I wrote a simple patches for userland and kernel parts of u32 classifier:
iproute/tc/f_u32.c
linux/net/sched/cls_u32.c
Now I can use filter table with 16384 entries. It's enough for O(1) operation,
but still not enough for using last two octets of IP address as a hash key.
Divisors 32768 and 65536 are not allowed due to insufficient kernel buffer
memory.
Command
# tc filter add dev eth1 parent 1:0 prio 5 handle 2: protocol ip \
u32 divisor 65536
gives "RTNETLINK answers: No buffer space available" instead of "Invalid divisor".
The question is "How to increase the size of the kernel buffer space?".
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