On Mon, 24 Nov 2003 09:52:30 +0530
"Venkatesh. K" <venkatesh@xxxxxxxxxxxxxx> wrote:
> Hi,
>
> I want to use 3rd octet in the ip address for creating hashng filters?
>
> How do I do it?
Hi,
what about this (two level hashing with the 3rd and the 4th octet):
FILTER_ADD="/sbin/tc filter add dev imq0 parent 1:0 protocol ip"
# 1st level - 3rd octet (mask 0x0000ff00)
$FILTER_ADD handle 2: u32 divisor 256
$FILTER_ADD u32 ht 800:: match ip dst 0/0 \
hashkey mask 0x0000ff00 at 16 link 2:
# 2nd level - 4th octet (mask 0x000000ff)
for i in $(seq 0 255); do
n=$(printf "%x" $i)
$FILTER_ADD handle $n: u32 divisor 256
$FILTER_ADD u32 ht 2:$n match ip dst 0/0 \
hashkey mask 0x000000ff at 16 link $n:
done
# hexa 10.11.12.13 -> c:d
hexa()
{
local IFS='.'
set $1
printf "%x:%x" $3 $4
}
# example: put 10.11.12.13 into the class 1:42
ip=10.11.12.13
$FILTER_ADD u32 ht $(hexa $ip) match ip dst $ip flowid 1:42
Something like that is working for me for about half a year. If you need "match ip src", use "at 12" instead of "at 16".
HTH
--
Martin Volf
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