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Commit 3bb45001 authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'handle_ing_lightweight' 



Daniel Borkmann says:

====================
handle_ing update

These are a couple of cleanups to make ingress a bit more lightweight.
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 986ccfdb d2788d34

include/linux/netdevice.h

+4 −0
Original line number Diff line number Diff line
@@ -1655,7 +1655,11 @@ struct net_device { 
	rx_handler_func_t __rcu	*rx_handler;

	void __rcu		*rx_handler_data;



#if CONFIG_NET_CLS_ACT

	struct tcf_proto __rcu  *ingress_cl_list;

#endif

	struct netdev_queue __rcu *ingress_queue;



	unsigned char		broadcast[MAX_ADDR_LEN];

#ifdef CONFIG_RFS_ACCEL

	struct cpu_rmap		*rx_cpu_rmap;

net/core/dev.c

+20 −28
Original line number Diff line number Diff line
@@ -3521,49 +3521,41 @@ EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); 
#endif



#ifdef CONFIG_NET_CLS_ACT

/* TODO: Maybe we should just force sch_ingress to be compiled in

 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions

 * a compare and 2 stores extra right now if we dont have it on

 * but have CONFIG_NET_CLS_ACT

 * NOTE: This doesn't stop any functionality; if you dont have

 * the ingress scheduler, you just can't add policies on ingress.

 *

 */

static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)

{

	int result = TC_ACT_OK;

	struct Qdisc *q;



	skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);



	q = rcu_dereference(rxq->qdisc);

	if (q != &noop_qdisc) {

		if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))

			result = qdisc_enqueue_root(skb, q);

	}



	return result;

}



static inline struct sk_buff *handle_ing(struct sk_buff *skb,

					 struct packet_type **pt_prev,

					 int *ret, struct net_device *orig_dev)

{

	struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);

	struct tcf_proto *cl = rcu_dereference_bh(skb->dev->ingress_cl_list);

	struct tcf_result cl_res;



	if (!rxq || rcu_access_pointer(rxq->qdisc) == &noop_qdisc)

	/* If there's at least one ingress present somewhere (so

	 * we get here via enabled static key), remaining devices

	 * that are not configured with an ingress qdisc will bail

	 * out here.

	 */

	if (!cl)

		return skb;



	if (*pt_prev) {

		*ret = deliver_skb(skb, *pt_prev, orig_dev);

		*pt_prev = NULL;

	}



	switch (ing_filter(skb, rxq)) {

	qdisc_bstats_update_cpu(cl->q, skb);

	skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);



	switch (tc_classify(skb, cl, &cl_res)) {

	case TC_ACT_OK:

	case TC_ACT_RECLASSIFY:

		skb->tc_index = TC_H_MIN(cl_res.classid);

		break;

	case TC_ACT_SHOT:

		qdisc_qstats_drop_cpu(cl->q);

	case TC_ACT_STOLEN:

	case TC_ACT_QUEUED:

		kfree_skb(skb);

		return NULL;

	default:

		break;

	}



	return skb;

net/sched/sch_ingress.c

+9 −49
Original line number Diff line number Diff line
@@ -12,16 +12,10 @@ 
#include <linux/list.h>

#include <linux/skbuff.h>

#include <linux/rtnetlink.h>



#include <net/netlink.h>

#include <net/pkt_sched.h>





struct ingress_qdisc_data {

	struct tcf_proto __rcu	*filter_list;

};



/* ------------------------- Class/flow operations ------------------------- */



static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)

{

	return NULL;
@@ -49,45 +43,11 @@ static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker) 
static struct tcf_proto __rcu **ingress_find_tcf(struct Qdisc *sch,

						 unsigned long cl)

{

	struct ingress_qdisc_data *p = qdisc_priv(sch);



	return &p->filter_list;

}



/* --------------------------- Qdisc operations ---------------------------- */



static int ingress_enqueue(struct sk_buff *skb, struct Qdisc *sch)

{

	struct ingress_qdisc_data *p = qdisc_priv(sch);

	struct tcf_result res;

	struct tcf_proto *fl = rcu_dereference_bh(p->filter_list);

	int result;



	result = tc_classify(skb, fl, &res);



	qdisc_bstats_update_cpu(sch, skb);

	switch (result) {

	case TC_ACT_SHOT:

		result = TC_ACT_SHOT;

		qdisc_qstats_drop_cpu(sch);

		break;

	case TC_ACT_STOLEN:

	case TC_ACT_QUEUED:

		result = TC_ACT_STOLEN;

		break;

	case TC_ACT_RECLASSIFY:

	case TC_ACT_OK:

		skb->tc_index = TC_H_MIN(res.classid);

	default:

		result = TC_ACT_OK;

		break;

	}

	struct net_device *dev = qdisc_dev(sch);



	return result;

	return &dev->ingress_cl_list;

}



/* ------------------------------------------------------------- */



static int ingress_init(struct Qdisc *sch, struct nlattr *opt)

{

	net_inc_ingress_queue();
@@ -98,9 +58,9 @@ static int ingress_init(struct Qdisc *sch, struct nlattr *opt) 


static void ingress_destroy(struct Qdisc *sch)

{

	struct ingress_qdisc_data *p = qdisc_priv(sch);

	struct net_device *dev = qdisc_dev(sch);



	tcf_destroy_chain(&p->filter_list);

	tcf_destroy_chain(&dev->ingress_cl_list);

	net_dec_ingress_queue();

}
@@ -111,6 +71,7 @@ static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb) 
	nest = nla_nest_start(skb, TCA_OPTIONS);

	if (nest == NULL)

		goto nla_put_failure;



	return nla_nest_end(skb, nest);



nla_put_failure:
@@ -131,8 +92,6 @@ static const struct Qdisc_class_ops ingress_class_ops = { 
static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {

	.cl_ops		=	&ingress_class_ops,

	.id		=	"ingress",

	.priv_size	=	sizeof(struct ingress_qdisc_data),

	.enqueue	=	ingress_enqueue,

	.init		=	ingress_init,

	.destroy	=	ingress_destroy,

	.dump		=	ingress_dump,
@@ -149,6 +108,7 @@ static void __exit ingress_module_exit(void) 
	unregister_qdisc(&ingress_qdisc_ops);

}



module_init(ingress_module_init)

module_exit(ingress_module_exit)

module_init(ingress_module_init);

module_exit(ingress_module_exit);



MODULE_LICENSE("GPL");