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Date: Wed, 30 May 2007 11:40:56 +0200 (MEST)
From: Patrick McHardy <kaber@...sh.net>
To: netdev@...r.kernel.org
Cc: Patrick McHardy <kaber@...sh.net>, hadi@...erus.ca
Subject: [RFC NET_SCHED 01/02]: sch_sfq: add support for external classifiers
[NET_SCHED]: sch_sfq: add support for external classifiers
Add support for external classifiers to allow using different flow hash
functions similar to ESFQ. As long as no classifier is attached the
built-in hash is used as before.
Signed-off-by: Patrick McHardy <kaber@...sh.net>
---
commit 666e402224e5ca36af0b5a07d424b9c092bce91e
tree f0e020de640693ba9601cc2e4b82daba7bf03689
parent c420bc9f09a0926b708c3edb27eacba434a4f4ba
author Patrick McHardy <kaber@...sh.net> Wed, 30 May 2007 11:21:05 +0200
committer Patrick McHardy <kaber@...sh.net> Wed, 30 May 2007 11:21:05 +0200
net/sched/sch_sfq.c | 98 +++++++++++++++++++++++++++++++++++++++++++++++++--
1 files changed, 94 insertions(+), 4 deletions(-)
diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c
index 96dfdf7..42cd4fc 100644
--- a/net/sched/sch_sfq.c
+++ b/net/sched/sch_sfq.c
@@ -108,6 +108,7 @@ struct sfq_sched_data
int limit;
/* Variables */
+ struct tcf_proto *filter_list;
struct timer_list perturb_timer;
int perturbation;
sfq_index tail; /* Index of current slot in round */
@@ -172,6 +173,42 @@ static unsigned sfq_hash(struct sfq_sched_data *q, struct sk_buff *skb)
return sfq_fold_hash(q, h, h2);
}
+static unsigned int sfq_classify(struct sk_buff *skb, struct Qdisc *sch,
+ int *qerr)
+{
+ struct sfq_sched_data *q = qdisc_priv(sch);
+ struct tcf_result res;
+ int result;
+
+ if (TC_H_MAJ(skb->priority) == sch->handle &&
+ TC_H_MIN(skb->priority) > 0 &&
+ TC_H_MIN(skb->priority) <= SFQ_HASH_DIVISOR)
+ return TC_H_MIN(skb->priority);
+
+ if (!q->filter_list)
+ return sfq_hash(q, skb) + 1;
+
+ *qerr = NET_XMIT_BYPASS;
+ result = tc_classify(skb, q->filter_list, &res);
+ if (result >= 0) {
+#ifdef CONFIG_NET_CLS_ACT
+ switch (result) {
+ case TC_ACT_STOLEN:
+ case TC_ACT_QUEUED:
+ *qerr = NET_XMIT_SUCCESS;
+ case TC_ACT_SHOT:
+ return 0;
+ }
+#elif defined(CONFIG_NET_CLS_POLICE)
+ if (result == TC_POLICE_SHOT)
+ return 0;
+#endif
+ if (TC_H_MIN(res.classid) <= SFQ_HASH_DIVISOR)
+ return TC_H_MIN(res.classid);
+ }
+ return 0;
+}
+
static inline void sfq_link(struct sfq_sched_data *q, sfq_index x)
{
sfq_index p, n;
@@ -262,8 +299,18 @@ static int
sfq_enqueue(struct sk_buff *skb, struct Qdisc* sch)
{
struct sfq_sched_data *q = qdisc_priv(sch);
- unsigned hash = sfq_hash(q, skb);
+ unsigned int hash;
sfq_index x;
+ int ret;
+
+ hash = sfq_classify(skb, sch, &ret);
+ if (hash == 0) {
+ if (ret == NET_XMIT_BYPASS)
+ sch->qstats.drops++;
+ kfree_skb(skb);
+ return ret;
+ }
+ hash--;
x = q->ht[hash];
if (x == SFQ_DEPTH) {
@@ -298,8 +345,18 @@ static int
sfq_requeue(struct sk_buff *skb, struct Qdisc* sch)
{
struct sfq_sched_data *q = qdisc_priv(sch);
- unsigned hash = sfq_hash(q, skb);
+ unsigned int hash;
sfq_index x;
+ int ret;
+
+ hash = sfq_classify(skb, sch, &ret);
+ if (hash == 0) {
+ if (ret == NET_XMIT_BYPASS)
+ sch->qstats.drops++;
+ kfree_skb(skb);
+ return ret;
+ }
+ hash--;
x = q->ht[hash];
if (x == SFQ_DEPTH) {
@@ -456,6 +513,8 @@ static int sfq_init(struct Qdisc *sch, struct rtattr *opt)
static void sfq_destroy(struct Qdisc *sch)
{
struct sfq_sched_data *q = qdisc_priv(sch);
+
+ tcf_destroy_chain(q->filter_list);
del_timer(&q->perturb_timer);
}
@@ -481,9 +540,40 @@ rtattr_failure:
return -1;
}
+static int sfq_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
+ struct rtattr **tca, unsigned long *arg)
+{
+ return -ENOSYS;
+}
+
+static unsigned long sfq_get(struct Qdisc *sch, u32 classid)
+{
+ return 0;
+}
+
+static struct tcf_proto **sfq_find_tcf(struct Qdisc *sch, unsigned long cl)
+{
+ struct sfq_sched_data *q = qdisc_priv(sch);
+
+ if (cl)
+ return NULL;
+ return &q->filter_list;
+}
+
+static void sfq_walk(struct Qdisc *sch, struct qdisc_walker *walker)
+{
+ return;
+}
+
+static struct Qdisc_class_ops sfq_class_ops = {
+ .get = sfq_get,
+ .change = sfq_change_class,
+ .tcf_chain = sfq_find_tcf,
+ .walk = sfq_walk,
+};
+
static struct Qdisc_ops sfq_qdisc_ops = {
- .next = NULL,
- .cl_ops = NULL,
+ .cl_ops = &sfq_class_ops,
.id = "sfq",
.priv_size = sizeof(struct sfq_sched_data),
.enqueue = sfq_enqueue,
-
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