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 <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sched/sch_choke.c b/net/sched/sch_choke.c
index 3b86a97..03ce895 100644 (file)
--- a/net/sched/sch_choke.c
+++ b/net/sched/sch_choke.c
@@ -58,7 +58,6 @@ struct choke_sched_data {
 
 /* Variables */
        struct red_vars  vars;
-       struct tcf_proto __rcu *filter_list;
        struct {
                u32     prob_drop;      /* Early probability drops */
                u32     prob_mark;      /* Early probability marks */
@@ -152,11 +151,6 @@ static inline void choke_set_classid(struct sk_buff *skb, u16 classid)
        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.
@@ -188,40 +182,6 @@ static bool choke_match_flow(struct sk_buff *skb1,
 }
 
 /*
- * 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;
-}
-
-/*
  * Select a packet at random from queue
  * HACK: since queue can have holes from previous deletion; retry several
  *   times to find a random skb but then just give up and return the head
@@ -257,9 +217,6 @@ static bool choke_match_random(const struct choke_sched_data *q,
                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);
 }
 
@@ -270,12 +227,6 @@ static int choke_enqueue(struct sk_buff *skb, struct Qdisc *sch,
        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) */
        q->vars.qavg = red_calc_qavg(p, &q->vars, sch->q.qlen);
@@ -340,7 +291,6 @@ congestion_drop:
        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);
@@ -538,7 +488,6 @@ static void choke_destroy(struct Qdisc *sch)
 {
        struct choke_sched_data *q = qdisc_priv(sch);
 
-       tcf_destroy_chain(&q->filter_list);
        choke_free(q->tab);
 }