net: sched: choke: remove dead filter classify code

sch_choke is classless qdisc so it does not define cl_ops. Therefore
filter_list cannot be ever changed, being NULL all the time.
Reason is this check in tc_ctl_tfilter:

/* Is it classful? */
cops = q->ops->cl_ops;
if (!cops)
return -EINVAL;

So remove this dead code.

Signed-off-by: Jiri Pirko <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/sched/sch_choke.c

···
 
 /* Variables */
 	struct red_vars  vars;
-	struct tcf_proto __rcu *filter_list;
 	struct {
 		u32	prob_drop;	/* Early probability drops */
 		u32	prob_mark;	/* Early probability marks */
···
 	choke_skb_cb(skb)->classid = classid;
 }
 
-static u16 choke_get_classid(const struct sk_buff *skb)
-{
-	return choke_skb_cb(skb)->classid;
-}
-
 /*
  * Compare flow of two packets
  *  Returns true only if source and destination address and port match.
···
 	return !memcmp(&choke_skb_cb(skb1)->keys,
 		       &choke_skb_cb(skb2)->keys,
 		       sizeof(choke_skb_cb(skb1)->keys));
-}
-
-/*
- * Classify flow using either:
- *  1. pre-existing classification result in skb
- *  2. fast internal classification
- *  3. use TC filter based classification
- */
-static bool choke_classify(struct sk_buff *skb,
-			   struct Qdisc *sch, int *qerr)
-
-{
-	struct choke_sched_data *q = qdisc_priv(sch);
-	struct tcf_result res;
-	struct tcf_proto *fl;
-	int result;
-
-	fl = rcu_dereference_bh(q->filter_list);
-	result = tc_classify(skb, fl, &res, false);
-	if (result >= 0) {
-#ifdef CONFIG_NET_CLS_ACT
-		switch (result) {
-		case TC_ACT_STOLEN:
-		case TC_ACT_QUEUED:
-			*qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
-		case TC_ACT_SHOT:
-			return false;
-		}
-#endif
-		choke_set_classid(skb, TC_H_MIN(res.classid));
-		return true;
-	}
-
-	return false;
 }
 
 /*
···
 		return false;
 
 	oskb = choke_peek_random(q, pidx);
-	if (rcu_access_pointer(q->filter_list))
-		return choke_get_classid(nskb) == choke_get_classid(oskb);
-
 	return choke_match_flow(oskb, nskb);
 }
 
···
 	int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
 	struct choke_sched_data *q = qdisc_priv(sch);
 	const struct red_parms *p = &q->parms;
-
-	if (rcu_access_pointer(q->filter_list)) {
-		/* If using external classifiers, get result and record it. */
-		if (!choke_classify(skb, sch, &ret))
-			goto other_drop;	/* Packet was eaten by filter */
-	}
 
 	choke_skb_cb(skb)->keys_valid = 0;
 	/* Compute average queue usage (see RED) */
···
 	qdisc_drop(skb, sch, to_free);
 	return NET_XMIT_CN;
 
-other_drop:
 	if (ret & __NET_XMIT_BYPASS)
 		qdisc_qstats_drop(sch);
 	__qdisc_drop(skb, to_free);
···
 {
 	struct choke_sched_data *q = qdisc_priv(sch);
 
-	tcf_destroy_chain(&q->filter_list);
 	choke_free(q->tab);
 }