[LARTC] TC Hashing Filters

[Catalin BOIE]

On Tue, 13 Jul 2004, Adam Towarnyckyj wrote:

> First off, no need to be rude. I read the documentation; I just missed
> the number limit.
> Second, I know it's in hex and that's what I'm using.
> Third, the script is rather large. I didn't want to post even a snippet
> because it is so big. But, if that's what you require in order to give
> me some advice, then here it is:

Show me the command that fails.

>
> Action("$tc qdisc del dev $dev root");
> Action("$tc qdisc add dev $dev root handle 1:0 cbq bandwidth 200mbit
> avpkt 1000");
>
> # Create 'transit class', tc hash tables, and hash filter
>
> Action("$tc class add dev $dev parent 1: classid 1:2 cbq bandwidth
> 200Mbit rate 200MBit allot 1514 weight 2Mbit prio 8 maxburst 20 avpkt
> 1000");
> Action("$tc filter add dev $dev parent 1: handle 2: protocol ip u32
> divisor 256");
> Action("$tc filter add dev $dev protocol ip parent 1: u32 match ip dst
> 0.0.0.0/0 hashkey mask 0x000000ff at 16 link 2:");
>
> # Create classes for rate groups
>
> @RATES = SelectSQL("SELECT dsrate FROM dsrate");
> my $classid = 3;
> foreach $dsrate (@RATES) {
>        $ds = $$dsrate{dsrate};
>        if ($ds == "0" || $ds == "1") {
>                next;
>        }
>        Action("$tc class add dev eth1 parent 1: classid 1:$classid cbq
> bandwidth 200Mbit rate $$dsrate{dsrate}Kbit allot 1514 prio 5 maxburst
> 20 avpkt 1000 bounded");
>        $rates{$ds} = $classid;
>        $classid++;
> }
>
> # Get our list of accounts
>
> @MODEMS = SelectSQL("SELECT mid, dsrate FROM modems");
>
> $z = 0;
> # Figure out account IPs and put 'em in!
> foreach $modem (@MODEMS) {
>        if ($$modem{dsrate} == "0" || $$modem{dsrate} == "1") {
>                next;
>        }
>        my @COMPUTERS = SelectSQL("SELECT ipid FROM computers WHERE
> mid='$$modem{mid}'");
>        foreach $computer (@COMPUTERS) {
>                my $ip = SelectSingleSQL("SELECT ipaddr FROM ips WHERE
> ipid='$$computer{ipid}'");
>                @octets = split(/\./,$ip);
>                $table = $octets[3];
>                $table = sprintf("%X", $table);
>                $classid = $rates{$$modem{dsrate}};
>                Action("$tc filter add dev $dev protocol ip parent 1:
> u32 ht 2:$table: match ip dst $ip flowid 1:$classid");
>                $z++;
>                print "$z\n";
>        }
> }
>
> "Action" is a sub that performs a system action and reports errors to
> another sub.
> "SelectSQL" is a sub that performs a sql query to our database.
>
> COMMENT: Why is it whenever anyone new posts a question to a list even
> after reading through the documentation, someone always has to jump down
> his throat instead of being helpful and kind? This is a mailing list
> which was created so people can ask questions and get a helpful response
> from a community. I have been nothing but nice to everyone here and I am
> really grateful for all the help that has been provided so far. Instead
> of barking at people, simply stating that you require a snippet of code
> and providing an answer would be much more helpful and wouldn't cause
> people like me to bark back which is surely going to cause an argument
> between us.
>
> Thanks again!
> Adam Towarnyckyj
>
>
> -----Original Message-----
> From: gypsy [mailto:gypsy@iswest.com]
> Sent: Monday, July 12, 2004 6:24 PM
> To: adamt@commspeed.net; LARTC
> Subject: Re: [LARTC] TC Hashing Filters
>
> Adam Towarnyckyj wrote:
>>
>> Hey all,
>>         So I got the script to run and populate everything. I watch as
>> the script uses the tc commands to add filters for each IP into their
>> appropriate tables. After 2045 entries, it starts to give me a "File
>> Exists" error. I've done extensive testing on the script and
> everything
>
> COMMENT: Why is it that everyone who has a bad script does not post
> (even a snip of) it?
>
> The limit is 65536.
>
> If you don't get the significance of that, it means the numbers are hex
> and you're trying to make 'em be decimal.  Go read docum.org.
>
>
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>

---
Catalin(ux aka Dino) BOIE
catab at deuroconsult.ro
http://kernel.umbrella.ro/