sched: allow user space to create pfifo_fast qdiscs on virtual interfaces, allow pfifo_fast qdiscs to have filters and filter actions - useful for controlling packet classification into wme classes

SVN-Revision: 16791

1 files changed, 142 insertions, 0 deletions

diff --git a/target/linux/generic-2.6/patches-2.6.30/260-extend_pfifo_fast.patch b/target/linux/generic-2.6/patches-2.6.30/260-extend_pfifo_fast.patch
new file mode 100644
index 0000000..70718e7
--- /dev/null
+++ b/target/linux/generic-2.6/patches-2.6.30/260-extend_pfifo_fast.patch
@@ -0,0 +1,142 @@
+--- a/net/sched/sch_generic.c
++++ b/net/sched/sch_generic.c
+@@ -371,16 +371,50 @@ static const u8 prio2band[TC_PRIO_MAX+1]
+ 
+ #define PFIFO_FAST_BANDS 3
+ 
++struct pfifo_fast_sched_data {
++	struct tcf_proto *filter_list;
++	struct sk_buff_head list[PFIFO_FAST_BANDS];
++};
++
+ static inline struct sk_buff_head *prio2list(struct sk_buff *skb,
+ 					     struct Qdisc *qdisc)
+ {
+-	struct sk_buff_head *list = qdisc_priv(qdisc);
++	struct pfifo_fast_sched_data *q = qdisc_priv(qdisc);
++	struct sk_buff_head *list = q->list;
+ 	return list + prio2band[skb->priority & TC_PRIO_MAX];
+ }
+ 
++static int pfifo_fast_filter(struct sk_buff *skb, struct Qdisc* qdisc)
++{
++#ifdef CONFIG_NET_CLS_ACT
++	struct pfifo_fast_sched_data *q = qdisc_priv(qdisc);
++	int result = 0, ret = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
++	struct tcf_result res;
++
++	if (q->filter_list != NULL)
++		result = tc_classify(skb, q->filter_list, &res);
++	if (result >= 0) {
++		switch (result) {
++		case TC_ACT_STOLEN:
++		case TC_ACT_QUEUED:
++			ret = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
++		case TC_ACT_SHOT:
++			kfree_skb(skb);
++			return ret;
++		}
++	}
++#endif
++	return 0;
++}
++
+ static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc* qdisc)
+ {
+ 	struct sk_buff_head *list = prio2list(skb, qdisc);
++	int ret;
++
++	ret = pfifo_fast_filter(skb, qdisc);
++	if (ret)
++		return ret;
+ 
+ 	if (skb_queue_len(list) < qdisc_dev(qdisc)->tx_queue_len) {
+ 		qdisc->q.qlen++;
+@@ -392,8 +426,9 @@ static int pfifo_fast_enqueue(struct sk_
+ 
+ static struct sk_buff *pfifo_fast_dequeue(struct Qdisc* qdisc)
+ {
++	struct pfifo_fast_sched_data *q = qdisc_priv(qdisc);
++	struct sk_buff_head *list = q->list;
+ 	int prio;
+-	struct sk_buff_head *list = qdisc_priv(qdisc);
+ 
+ 	for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) {
+ 		if (!skb_queue_empty(list + prio)) {
+@@ -420,8 +455,9 @@ static struct sk_buff *pfifo_fast_peek(s
+ 
+ static void pfifo_fast_reset(struct Qdisc* qdisc)
+ {
++	struct pfifo_fast_sched_data *q = qdisc_priv(qdisc);
++	struct sk_buff_head *list = q->list;
+ 	int prio;
+-	struct sk_buff_head *list = qdisc_priv(qdisc);
+ 
+ 	for (prio = 0; prio < PFIFO_FAST_BANDS; prio++)
+ 		__qdisc_reset_queue(qdisc, list + prio);
+@@ -444,8 +480,9 @@ nla_put_failure:
+ 
+ static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt)
+ {
++	struct pfifo_fast_sched_data *q = qdisc_priv(qdisc);
++	struct sk_buff_head *list = q->list;
+ 	int prio;
+-	struct sk_buff_head *list = qdisc_priv(qdisc);
+ 
+ 	for (prio = 0; prio < PFIFO_FAST_BANDS; prio++)
+ 		skb_queue_head_init(list + prio);
+@@ -453,9 +490,36 @@ static int pfifo_fast_init(struct Qdisc 
+ 	return 0;
+ }
+ 
++static int pfifo_fast_change_class(struct Qdisc *qdisc, u32 classid, u32 parentid,
++			    struct nlattr **tca, unsigned long *arg)
++{
++	return -EOPNOTSUPP;
++}
++
++static unsigned long pfifo_fast_get(struct Qdisc *qdisc, u32 classid)
++{
++	return 0;
++}
++
++static struct tcf_proto **pfifo_fast_find_tcf(struct Qdisc *qdisc, unsigned long cl)
++{
++	struct pfifo_fast_sched_data *q = qdisc_priv(qdisc);
++
++	if (cl)
++		return NULL;
++	return &q->filter_list;
++}
++
++static const struct Qdisc_class_ops pfifo_fast_class_ops = {
++	.get		=	pfifo_fast_get,
++	.change		=	pfifo_fast_change_class,
++	.tcf_chain	=	pfifo_fast_find_tcf,
++};
++
+ static struct Qdisc_ops pfifo_fast_ops __read_mostly = {
+ 	.id		=	"pfifo_fast",
+-	.priv_size	=	PFIFO_FAST_BANDS * sizeof(struct sk_buff_head),
++	.cl_ops		=	&pfifo_fast_class_ops,
++	.priv_size	=	sizeof(struct pfifo_fast_sched_data),
+ 	.enqueue	=	pfifo_fast_enqueue,
+ 	.dequeue	=	pfifo_fast_dequeue,
+ 	.peek		=	pfifo_fast_peek,
+@@ -735,3 +799,16 @@ void dev_shutdown(struct net_device *dev
+ 	shutdown_scheduler_queue(dev, &dev->rx_queue, &noop_qdisc);
+ 	WARN_ON(timer_pending(&dev->watchdog_timer));
+ }
++
++static int __init sch_generic_init(void)
++{
++	return register_qdisc(&pfifo_fast_ops);
++}
++
++static void __exit sch_generic_exit(void)
++{
++	unregister_qdisc(&pfifo_fast_ops);
++}
++
++module_init(sch_generic_init)
++module_exit(sch_generic_exit)