[LARTC] question about filter priorities and "tc -d filter show" output

[jacob martinson <martinson.jacob@gmail.com>]

forgot the [LARTC] prefix in the subject...


On Thu, 27 Jan 2005 12:00:14 -0600, jacob martinson
<martinson.jacob@gmail.com> wrote:
> The interface is setup like this:
> # tc qdisc del dev eth0 root
> # tc qdisc add dev eth0 root handle 1: htb default 2
> # tc class add dev eth0 parent 1: classid 1:2 htb rate 20mbit ceil 20mbit
> 
> If I add a second class and a filter to send traffic to it like this:
> # tc class add dev eth0 parent 1: classid 1:130 htb rate 1Mbit ceil 1Mbit
> # tc filter add dev eth0 protocol ip parent 1:0 prio 130 u32 match ip dst \
> > 1.1.1.10 flowid 1:130
> 
> The output of "tc -d filter show dev eth0" makes sense to me and looks
> like this:
> filter parent 1: protocol ip pref 130 u32
> filter parent 1: protocol ip pref 130 u32 fh 800: ht divisor 1
> filter parent 1: protocol ip pref 130 u32 fh 800::800 order 2048 key
> ht 800 bkt 0 flowid 1:130
>   match 0101010a/ffffffff at 16
> 
> If I add a third class and a filter for it, things start looking weird to me:
> 
> # tc filter add dev eth0 protocol ip parent 1:0 prio 131 u32 match ip
> dst 1.1.1.11 \
> > flowid 1:131
> # tc class add dev eth0 parent 1: classid 1:132 htb rate 1Mbit ceil 1Mbit
> # tc -d filter show dev eth0
> filter parent 1: protocol ip pref 130 u32
> filter parent 1: protocol ip pref 130 u32 fh 801: ht divisor 1
> filter parent 1: protocol ip pref 130 u32 fh 801::800 order 2048 key
> ht 801 bkt 0 flowid 1:131
>   match 0101010b/ffffffff at 16
> filter parent 1: protocol ip pref 130 u32 fh 800: ht divisor 1
> filter parent 1: protocol ip pref 130 u32 fh 800::800 order 2048 key
> ht 800 bkt 0 flowid 1:130
>   match 0101010a/ffffffff at 16
> filter parent 1: protocol ip pref 131 u32
> filter parent 1: protocol ip pref 131 u32 fh 801: ht divisor 1
> filter parent 1: protocol ip pref 131 u32 fh 801::800 order 2048 key
> ht 801 bkt 0 flowid 1:131
>   match 0101010b/ffffffff at 16
> filter parent 1: protocol ip pref 131 u32 fh 800: ht divisor 1
> filter parent 1: protocol ip pref 131 u32 fh 800::800 order 2048 key
> ht 800 bkt 0 flowid 1:130
>   match 0101010a/ffffffff at 16
> 
> If N is the number of filters I have on the root qdisc, I get
> N-squared entries from the "show filter" command.
> 
> Can someone explain how this works or point me to documentation that
> explains it?  My system doesn't have a "tc-filters" manpage.
> 
> Thanks!
> 
> -Jacob
>
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