Date:	Tue, 22 Jan 2008 22:14:37 -0200
From:	Dzianis Kahanovich <mahatma@...u.unibel.by>
To:	hadi@...erus.ca
CC:	netdev@...r.kernel.org
Subject: Re: [PATCH 2.6.23+] ingress classify to [nf]mark

Too many pixels to smoke. Sorry.

May be so? ;)) (if undefined classid not overwrited by random value tc_classify)
Even "tc" say to classid=0 - "????"

--- 1/net/sched/sch_ingress.c	2008-01-12 17:27:05.000000000 +0200
+++ 2/net/sched/sch_ingress.c	2008-01-22 22:09:32.000000000 +0200
@@ -136,6 +136,9 @@
  	struct ingress_qdisc_data *p = PRIV(sch);
  	struct tcf_result res;
  	int result;
+#ifdef CONFIG_NET_SCH_INGRESS_TC2MARK
+	res.classid=0;
+#endif

  	D2PRINTK("ingress_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
  	result = tc_classify(skb, p->filter_list, &res);
@@ -169,6 +172,11 @@
  	sch->bstats.packets++;
  	sch->bstats.bytes += skb->len;
  #endif
+#ifdef CONFIG_NET_SCH_INGRESS_TC2MARK
+	if(res.classid)
+	    skb->mark = 
(skb->mark&(res.classid>>16))|(skb->tc_index=TC_H_MIN(res.classid));
+//	    skb->mark=res.classid; /* or just so */
+#endif

  	return result;
  }



jamal wrote:
> On Mon, 2008-14-01 at 20:20 -0200, Dzianis Kahanovich wrote:
>> jamal wrote:
> [..] 
> 
>>> Did that make sense?
>> After current "#endif" - may be.
> 
> I am afraid that would be counter to expected behavior. 
> Default is meant to apply when no value has been defined. Mark of 0 for
> example doesnt mean "default". Let me demonstrate with the ifdefs again
> with some arbitrary example:
> 
> -----------------
> #ifdef CONFIG_NET_CLS_ACT
> ..classify ...
>     .. action 1 sets mark to 0x11111
>     .. action 2 checks some state and conditionally let action 3 execute
>     .. action 3 sets mark to 0
> 
> if OK is returned set tc_index based on classid
> 
> #else // no actions compiled
> ..classify
> .... jamal suggests: set default mark and tc_index for ingress here
> #endif
> 
> // mahatma wants to set default for mark and tcindex here 
> // so it works for both actions and none-action code
> ------------------------
> 
> Lets look at the case of actions compiled in:
> I have defined my policies (in user space) so that the mark can be set
> to either 0 or 0x1111 depending on some runtime state. 
> Your default (kernel) code is now going to overide my policy - which is
> bad. Even in the case of OK being returned, it is wrong to set tc_index;
> unfortunately, we dont have an action that can set tc_index today; if we
> did, we would need to remove that setting.
> 
> You other intent was to set the value of mark based on the value of
> classid. You _can do that today already_ with no changes via a policy in
> user space. You suggested to do an ifdef so you wont have to type in the
> line which says how to mark, and i said that was a bad idea (we need
> less ifdefs not more). 
> 
> For the case of no actions compiled in:
> nothing can write into the values of either tcindex or mark after
> classification (on ingress), so it is ok to override. If you did this
> for egress as well, that would be wrong because it is expected that some
> qdiscs may set or utilize these metadatum.
> 
> I am not sure if it made more sense this time?
> 
>> What "result" are with:
>> 1) no filters?
>> 2) 1 filter only, with "action continue"?
> 
> Please refer to above verbosity and see if it all makes better sense.
> 
> cheers,
> jamal
> 
> 
> 
	

-- 
WBR,
Denis Kaganovich,  mahatma@...by  http://mahatma.bspu.unibel.by
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