From 5952fde10c35ecfefb0c3e61536170798d4a51c9 Mon Sep 17 00:00:00 2001
From: Jiri Pirko <jiri@mellanox.com>
Date: Thu, 23 Mar 2017 17:02:16 +0100
Subject: [PATCH] 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>
---
net/sched/sch_choke.c | 51 -------------------------------------------
1 file changed, 51 deletions(-)
diff --git a/net/sched/sch_choke.c b/net/sched/sch_choke.c
index 3b86a97bc67c3..03ce895d7ff51 100644
--- 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.
@@ -187,40 +181,6 @@ static bool choke_match_flow(struct sk_buff *skb1,
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;
-}
-
/*
* Select a packet at random from queue
* HACK: since queue can have holes from previous deletion; retry several
@@ -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);
}
--
2.30.2