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Commit 2519a602 authored by WANG Cong's avatar WANG Cong Committed by David S. Miller
Browse files

net_sched: optimize tcf_match_indev() 



tcf_match_indev() is called in fast path, it is not wise to
search for a netdev by ifindex and then compare by its name,
just compare the ifindex.

Also, dev->name could be changed by user-space, therefore
the match would be always fail, but dev->ifindex could
be consistent.

BTW, this will also save some bytes from the core struct of u32.

Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: default avatarJamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 832d1d5b

include/net/pkt_cls.h

+15 −15
Original line number Diff line number Diff line
@@ -338,27 +338,27 @@ static inline int tcf_valid_offset(const struct sk_buff *skb, 
#include <net/net_namespace.h>



static inline int

tcf_change_indev(struct tcf_proto *tp, char *indev, struct nlattr *indev_tlv)

tcf_change_indev(struct net *net, struct nlattr *indev_tlv)

{

	char indev[IFNAMSIZ];

	struct net_device *dev;



	if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ)

		return -EINVAL;

	return 0;

	dev = __dev_get_by_name(net, indev);

	if (!dev)

		return -ENODEV;

	return dev->ifindex;

}



static inline int

tcf_match_indev(struct sk_buff *skb, char *indev)

static inline bool

tcf_match_indev(struct sk_buff *skb, int ifindex)

{

	struct net_device *dev;



	if (indev[0]) {

	if (!ifindex)

		return true;

	if  (!skb->skb_iif)

			return 0;

		dev = __dev_get_by_index(dev_net(skb->dev), skb->skb_iif);

		if (!dev || strcmp(indev, dev->name))

			return 0;

	}



	return 1;

		return false;

	return ifindex == skb->skb_iif;

}

#endif /* CONFIG_NET_CLS_IND */

net/sched/cls_fw.c

+12 −7
Original line number Diff line number Diff line
@@ -41,7 +41,7 @@ struct fw_filter { 
	u32			id;

	struct tcf_result	res;

#ifdef CONFIG_NET_CLS_IND

	char			indev[IFNAMSIZ];

	int			ifindex;

#endif /* CONFIG_NET_CLS_IND */

	struct tcf_exts		exts;

};
@@ -86,7 +86,7 @@ static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp, 
			if (f->id == id) {

				*res = f->res;

#ifdef CONFIG_NET_CLS_IND

				if (!tcf_match_indev(skb, f->indev))

				if (!tcf_match_indev(skb, f->ifindex))

					continue;

#endif /* CONFIG_NET_CLS_IND */

				r = tcf_exts_exec(skb, &f->exts, res);
@@ -207,9 +207,11 @@ fw_change_attrs(struct net *net, struct tcf_proto *tp, struct fw_filter *f, 


#ifdef CONFIG_NET_CLS_IND

	if (tb[TCA_FW_INDEV]) {

		err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV]);

		if (err < 0)

		int ret;

		ret = tcf_change_indev(net, tb[TCA_FW_INDEV]);

		if (ret < 0)

			goto errout;

		f->ifindex = ret;

	}

#endif /* CONFIG_NET_CLS_IND */
@@ -348,9 +350,12 @@ static int fw_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, 
	    nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))

		goto nla_put_failure;

#ifdef CONFIG_NET_CLS_IND

	if (strlen(f->indev) &&

	    nla_put_string(skb, TCA_FW_INDEV, f->indev))

	if (f->ifindex) {

		struct net_device *dev;

		dev = __dev_get_by_index(net, f->ifindex);

		if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))

			goto nla_put_failure;

	}

#endif /* CONFIG_NET_CLS_IND */

	if (head->mask != 0xFFFFFFFF &&

	    nla_put_u32(skb, TCA_FW_MASK, head->mask))

net/sched/cls_u32.c

+12 −7
Original line number Diff line number Diff line
@@ -48,7 +48,7 @@ struct tc_u_knode { 
	struct tc_u_hnode	*ht_up;

	struct tcf_exts		exts;

#ifdef CONFIG_NET_CLS_IND

	char                     indev[IFNAMSIZ];

	int			ifindex;

#endif

	u8			fshift;

	struct tcf_result	res;
@@ -152,7 +152,7 @@ static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct 


				*res = n->res;

#ifdef CONFIG_NET_CLS_IND

				if (!tcf_match_indev(skb, n->indev)) {

				if (!tcf_match_indev(skb, n->ifindex)) {

					n = n->next;

					goto next_knode;

				}
@@ -527,9 +527,11 @@ static int u32_set_parms(struct net *net, struct tcf_proto *tp, 


#ifdef CONFIG_NET_CLS_IND

	if (tb[TCA_U32_INDEV]) {

		err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]);

		if (err < 0)

		int ret;

		ret = tcf_change_indev(net, tb[TCA_U32_INDEV]);

		if (ret < 0)

			goto errout;

		n->ifindex = ret;

	}

#endif

	tcf_exts_change(tp, &n->exts, &e);
@@ -760,9 +762,12 @@ static int u32_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, 
			goto nla_put_failure;



#ifdef CONFIG_NET_CLS_IND

		if (strlen(n->indev) &&

		    nla_put_string(skb, TCA_U32_INDEV, n->indev))

		if (n->ifindex) {

			struct net_device *dev;

			dev = __dev_get_by_index(net, n->ifindex);

			if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))

				goto nla_put_failure;

		}

#endif

#ifdef CONFIG_CLS_U32_PERF

		if (nla_put(skb, TCA_U32_PCNT,