net: rcu-ify tcf_proto

rcu'ify tcf_proto this allows calling tc_classify() without holding
any locks. Updaters are protected by RTNL.

This patch prepares the core net_sched infrastracture for running
the classifier/action chains without holding the qdisc lock however
it does nothing to ensure cls_xxx and act_xxx types also work without
locking. Additional patches are required to address the fall out.
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/sch_generic.h

@@ -143,7 +143,7 @@ struct Qdisc_class_ops {
 	void			(*walk)(struct Qdisc *, struct qdisc_walker * arg);
 
 	/* Filter manipulation */
-	struct tcf_proto **	(*tcf_chain)(struct Qdisc *, unsigned long);
+	struct tcf_proto __rcu ** (*tcf_chain)(struct Qdisc *, unsigned long);
 	unsigned long		(*bind_tcf)(struct Qdisc *, unsigned long,
 					u32 classid);
 	void			(*unbind_tcf)(struct Qdisc *, unsigned long);
@@ -212,8 +212,8 @@ struct tcf_proto_ops {
 
 struct tcf_proto {
 	/* Fast access part */
-	struct tcf_proto	*next;
-	void			*root;
+	struct tcf_proto __rcu	*next;
+	void __rcu		*root;
 	int			(*classify)(struct sk_buff *,
 					    const struct tcf_proto *,
 					    struct tcf_result *);
@@ -225,6 +225,7 @@ struct tcf_proto {
 	struct Qdisc		*q;
 	void			*data;
 	const struct tcf_proto_ops	*ops;
+	struct rcu_head		rcu;
 };
 
 struct qdisc_skb_cb {
@@ -378,7 +379,7 @@ struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
 			       const struct qdisc_size_table *stab);
 void tcf_destroy(struct tcf_proto *tp);
-void tcf_destroy_chain(struct tcf_proto **fl);
+void tcf_destroy_chain(struct tcf_proto __rcu **fl);
 
 /* Reset all TX qdiscs greater then index of a device.  */
 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)

net/sched/cls_api.c

@@ -117,7 +117,6 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
 {
 	struct net *net = sock_net(skb->sk);
 	struct nlattr *tca[TCA_MAX + 1];
-	spinlock_t *root_lock;
 	struct tcmsg *t;
 	u32 protocol;
 	u32 prio;
@@ -125,7 +124,8 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
 	u32 parent;
 	struct net_device *dev;
 	struct Qdisc  *q;
-	struct tcf_proto **back, **chain;
+	struct tcf_proto __rcu **back;
+	struct tcf_proto __rcu **chain;
 	struct tcf_proto *tp;
 	const struct tcf_proto_ops *tp_ops;
 	const struct Qdisc_class_ops *cops;
@@ -197,7 +197,9 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
 		goto errout;
 
 	/* Check the chain for existence of proto-tcf with this priority */
-	for (back = chain; (tp = *back) != NULL; back = &tp->next) {
+	for (back = chain;
+	     (tp = rtnl_dereference(*back)) != NULL;
+	     back = &tp->next) {
 		if (tp->prio >= prio) {
 			if (tp->prio == prio) {
 				if (!nprio ||
@@ -209,8 +211,6 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
 		}
 	}
 
-	root_lock = qdisc_root_sleeping_lock(q);
-
 	if (tp == NULL) {
 		/* Proto-tcf does not exist, create new one */
 
@@ -259,7 +259,8 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
 		}
 		tp->ops = tp_ops;
 		tp->protocol = protocol;
-		tp->prio = nprio ? : TC_H_MAJ(tcf_auto_prio(*back));
+		tp->prio = nprio ? :
+			       TC_H_MAJ(tcf_auto_prio(rtnl_dereference(*back)));
 		tp->q = q;
 		tp->classify = tp_ops->classify;
 		tp->classid = parent;
@@ -280,9 +281,9 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
 
 	if (fh == 0) {
 		if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) {
-			spin_lock_bh(root_lock);
-			*back = tp->next;
-			spin_unlock_bh(root_lock);
+			struct tcf_proto *next = rtnl_dereference(tp->next);
+
+			RCU_INIT_POINTER(*back, next);
 
 			tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER);
 			tcf_destroy(tp);
@@ -322,10 +323,8 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
 			      n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE);
 	if (err == 0) {
 		if (tp_created) {
-			spin_lock_bh(root_lock);
-			tp->next = *back;
-			*back = tp;
-			spin_unlock_bh(root_lock);
+			RCU_INIT_POINTER(tp->next, rtnl_dereference(*back));
+			rcu_assign_pointer(*back, tp);
 		}
 		tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER);
 	} else {
@@ -420,7 +419,7 @@ static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
 	int s_t;
 	struct net_device *dev;
 	struct Qdisc *q;
-	struct tcf_proto *tp, **chain;
+	struct tcf_proto *tp, __rcu **chain;
 	struct tcmsg *tcm = nlmsg_data(cb->nlh);
 	unsigned long cl = 0;
 	const struct Qdisc_class_ops *cops;
@@ -454,7 +453,8 @@ static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
 
 	s_t = cb->args[0];
 
-	for (tp = *chain, t = 0; tp; tp = tp->next, t++) {
+	for (tp = rtnl_dereference(*chain), t = 0;
+	     tp; tp = rtnl_dereference(tp->next), t++) {
 		if (t < s_t)
 			continue;
 		if (TC_H_MAJ(tcm->tcm_info) &&

net/sched/sch_api.c

@@ -1781,7 +1781,7 @@ int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
 	__be16 protocol = skb->protocol;
 	int err;
 
-	for (; tp; tp = tp->next) {
+	for (; tp; tp = rcu_dereference_bh(tp->next)) {
 		if (tp->protocol != protocol &&
 		    tp->protocol != htons(ETH_P_ALL))
 			continue;
@@ -1833,15 +1833,15 @@ void tcf_destroy(struct tcf_proto *tp)
 {
 	tp->ops->destroy(tp);
 	module_put(tp->ops->owner);
-	kfree(tp);
+	kfree_rcu(tp, rcu);
 }
 
-void tcf_destroy_chain(struct tcf_proto **fl)
+void tcf_destroy_chain(struct tcf_proto __rcu **fl)
 {
 	struct tcf_proto *tp;
 
-	while ((tp = *fl) != NULL) {
-		*fl = tp->next;
+	while ((tp = rtnl_dereference(*fl)) != NULL) {
+		RCU_INIT_POINTER(*fl, tp->next);
 		tcf_destroy(tp);
 	}
 }

net/sched/sch_atm.c

@@ -41,7 +41,7 @@
 
 struct atm_flow_data {
 	struct Qdisc		*q;	/* FIFO, TBF, etc. */
-	struct tcf_proto	*filter_list;
+	struct tcf_proto __rcu	*filter_list;
 	struct atm_vcc		*vcc;	/* VCC; NULL if VCC is closed */
 	void			(*old_pop)(struct atm_vcc *vcc,
 					   struct sk_buff *skb); /* chaining */
@@ -273,7 +273,7 @@ static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
 		error = -ENOBUFS;
 		goto err_out;
 	}
-	flow->filter_list = NULL;
+	RCU_INIT_POINTER(flow->filter_list, NULL);
 	flow->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid);
 	if (!flow->q)
 		flow->q = &noop_qdisc;
@@ -311,7 +311,7 @@ static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
 	pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
 	if (list_empty(&flow->list))
 		return -EINVAL;
-	if (flow->filter_list || flow == &p->link)
+	if (rcu_access_pointer(flow->filter_list) || flow == &p->link)
 		return -EBUSY;
 	/*
 	 * Reference count must be 2: one for "keepalive" (set at class
@@ -345,7 +345,8 @@ static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
 	}
 }
 
-static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl)
+static struct tcf_proto __rcu **atm_tc_find_tcf(struct Qdisc *sch,
+						unsigned long cl)
 {
 	struct atm_qdisc_data *p = qdisc_priv(sch);
 	struct atm_flow_data *flow = (struct atm_flow_data *)cl;
@@ -369,11 +370,12 @@ static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 	flow = NULL;
 	if (TC_H_MAJ(skb->priority) != sch->handle ||
 	    !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) {
+		struct tcf_proto *fl;
+
 		list_for_each_entry(flow, &p->flows, list) {
-			if (flow->filter_list) {
-				result = tc_classify_compat(skb,
-							    flow->filter_list,
-							    &res);
+			fl = rcu_dereference_bh(flow->filter_list);
+			if (fl) {
+				result = tc_classify_compat(skb, fl, &res);
 				if (result < 0)
 					continue;
 				flow = (struct atm_flow_data *)res.class;
@@ -544,7 +546,7 @@ static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
 	if (!p->link.q)
 		p->link.q = &noop_qdisc;
 	pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
-	p->link.filter_list = NULL;
+	RCU_INIT_POINTER(p->link.filter_list, NULL);
 	p->link.vcc = NULL;
 	p->link.sock = NULL;
 	p->link.classid = sch->handle;

net/sched/sch_cbq.c

@@ -133,7 +133,7 @@ struct cbq_class {
 	struct gnet_stats_rate_est64 rate_est;
 	struct tc_cbq_xstats	xstats;
 
-	struct tcf_proto	*filter_list;
+	struct tcf_proto __rcu	*filter_list;
 
 	int			refcnt;
 	int			filters;
@@ -221,6 +221,7 @@ cbq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
 	struct cbq_class **defmap;
 	struct cbq_class *cl = NULL;
 	u32 prio = skb->priority;
+	struct tcf_proto *fl;
 	struct tcf_result res;
 
 	/*
@@ -235,11 +236,12 @@ cbq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
 		int result = 0;
 		defmap = head->defaults;
 
+		fl = rcu_dereference_bh(head->filter_list);
 		/*
 		 * Step 2+n. Apply classifier.
 		 */
-		if (!head->filter_list ||
-		    (result = tc_classify_compat(skb, head->filter_list, &res)) < 0)
+		result = tc_classify_compat(skb, fl, &res);
+		if (!fl || result < 0)
 			goto fallback;
 
 		cl = (void *)res.class;
@@ -1954,7 +1956,8 @@ static int cbq_delete(struct Qdisc *sch, unsigned long arg)
 	return 0;
 }
 
-static struct tcf_proto **cbq_find_tcf(struct Qdisc *sch, unsigned long arg)
+static struct tcf_proto __rcu **cbq_find_tcf(struct Qdisc *sch,
+					     unsigned long arg)
 {
 	struct cbq_sched_data *q = qdisc_priv(sch);
 	struct cbq_class *cl = (struct cbq_class *)arg;

net/sched/sch_choke.c

@@ -57,7 +57,7 @@ struct choke_sched_data {
 
 /* Variables */
 	struct red_vars  vars;
-	struct tcf_proto *filter_list;
+	struct tcf_proto __rcu *filter_list;
 	struct {
 		u32	prob_drop;	/* Early probability drops */
 		u32	prob_mark;	/* Early probability marks */
@@ -193,9 +193,11 @@ static bool choke_classify(struct sk_buff *skb,
 {
 	struct choke_sched_data *q = qdisc_priv(sch);
 	struct tcf_result res;
+	struct tcf_proto *fl;
 	int result;
 
-	result = tc_classify(skb, q->filter_list, &res);
+	fl = rcu_dereference_bh(q->filter_list);
+	result = tc_classify(skb, fl, &res);
 	if (result >= 0) {
 #ifdef CONFIG_NET_CLS_ACT
 		switch (result) {
@@ -249,7 +251,7 @@ static bool choke_match_random(const struct choke_sched_data *q,
 		return false;
 
 	oskb = choke_peek_random(q, pidx);
-	if (q->filter_list)
+	if (rcu_access_pointer(q->filter_list))
 		return choke_get_classid(nskb) == choke_get_classid(oskb);
 
 	return choke_match_flow(oskb, nskb);
@@ -257,11 +259,11 @@ static bool choke_match_random(const struct choke_sched_data *q,
 
 static int choke_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 {
+	int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
 	struct choke_sched_data *q = qdisc_priv(sch);
 	const struct red_parms *p = &q->parms;
-	int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
 
-	if (q->filter_list) {
+	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 */
@@ -554,7 +556,8 @@ static unsigned long choke_bind(struct Qdisc *sch, unsigned long parent,
 	return 0;
 }
 
-static struct tcf_proto **choke_find_tcf(struct Qdisc *sch, unsigned long cl)
+static struct tcf_proto __rcu **choke_find_tcf(struct Qdisc *sch,
+					       unsigned long cl)
 {
 	struct choke_sched_data *q = qdisc_priv(sch);
 

net/sched/sch_drr.c

@@ -35,7 +35,7 @@ struct drr_class {
 
 struct drr_sched {
 	struct list_head		active;
-	struct tcf_proto		*filter_list;
+	struct tcf_proto __rcu		*filter_list;
 	struct Qdisc_class_hash		clhash;
 };
 
@@ -184,7 +184,8 @@ static void drr_put_class(struct Qdisc *sch, unsigned long arg)
 		drr_destroy_class(sch, cl);
 }
 
-static struct tcf_proto **drr_tcf_chain(struct Qdisc *sch, unsigned long cl)
+static struct tcf_proto __rcu **drr_tcf_chain(struct Qdisc *sch,
+					      unsigned long cl)
 {
 	struct drr_sched *q = qdisc_priv(sch);
 
@@ -319,6 +320,7 @@ static struct drr_class *drr_classify(struct sk_buff *skb, struct Qdisc *sch,
 	struct drr_sched *q = qdisc_priv(sch);
 	struct drr_class *cl;
 	struct tcf_result res;
+	struct tcf_proto *fl;
 	int result;
 
 	if (TC_H_MAJ(skb->priority ^ sch->handle) == 0) {
@@ -328,7 +330,8 @@ static struct drr_class *drr_classify(struct sk_buff *skb, struct Qdisc *sch,
 	}
 
 	*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
-	result = tc_classify(skb, q->filter_list, &res);
+	fl = rcu_dereference_bh(q->filter_list);
+	result = tc_classify(skb, fl, &res);
 	if (result >= 0) {
 #ifdef CONFIG_NET_CLS_ACT
 		switch (result) {

net/sched/sch_dsmark.c

@@ -37,7 +37,7 @@
 
 struct dsmark_qdisc_data {
 	struct Qdisc		*q;
-	struct tcf_proto	*filter_list;
+	struct tcf_proto __rcu	*filter_list;
 	u8			*mask;	/* "owns" the array */
 	u8			*value;
 	u16			indices;
@@ -186,7 +186,7 @@ static void dsmark_walk(struct Qdisc *sch, struct qdisc_walker *walker)
 	}
 }
 
-static inline struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,
+static inline struct tcf_proto __rcu **dsmark_find_tcf(struct Qdisc *sch,
 						       unsigned long cl)
 {
 	struct dsmark_qdisc_data *p = qdisc_priv(sch);
@@ -229,7 +229,8 @@ static int dsmark_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 		skb->tc_index = TC_H_MIN(skb->priority);
 	else {
 		struct tcf_result res;
-		int result = tc_classify(skb, p->filter_list, &res);
+		struct tcf_proto *fl = rcu_dereference_bh(p->filter_list);
+		int result = tc_classify(skb, fl, &res);
 
 		pr_debug("result %d class 0x%04x\n", result, res.classid);
 

net/sched/sch_fq_codel.c

@@ -52,7 +52,7 @@ struct fq_codel_flow {
 }; /* please try to keep this structure <= 64 bytes */
 
 struct fq_codel_sched_data {
-	struct tcf_proto *filter_list;	/* optional external classifier */
+	struct tcf_proto __rcu *filter_list; /* optional external classifier */
 	struct fq_codel_flow *flows;	/* Flows table [flows_cnt] */
 	u32		*backlogs;	/* backlog table [flows_cnt] */
 	u32		flows_cnt;	/* number of flows */
@@ -85,6 +85,7 @@ static unsigned int fq_codel_classify(struct sk_buff *skb, struct Qdisc *sch,
 				      int *qerr)
 {
 	struct fq_codel_sched_data *q = qdisc_priv(sch);
+	struct tcf_proto *filter;
 	struct tcf_result res;
 	int result;
 
@@ -93,11 +94,12 @@ static unsigned int fq_codel_classify(struct sk_buff *skb, struct Qdisc *sch,
 	    TC_H_MIN(skb->priority) <= q->flows_cnt)
 		return TC_H_MIN(skb->priority);
 
-	if (!q->filter_list)
+	filter = rcu_dereference(q->filter_list);
+	if (!filter)
 		return fq_codel_hash(q, skb) + 1;
 
 	*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
-	result = tc_classify(skb, q->filter_list, &res);
+	result = tc_classify(skb, filter, &res);
 	if (result >= 0) {
 #ifdef CONFIG_NET_CLS_ACT
 		switch (result) {
@@ -496,7 +498,8 @@ static void fq_codel_put(struct Qdisc *q, unsigned long cl)
 {
 }
 
-static struct tcf_proto **fq_codel_find_tcf(struct Qdisc *sch, unsigned long cl)
+static struct tcf_proto __rcu **fq_codel_find_tcf(struct Qdisc *sch,
+						  unsigned long cl)
 {
 	struct fq_codel_sched_data *q = qdisc_priv(sch);
 

net/sched/sch_hfsc.c

@@ -116,7 +116,7 @@ struct hfsc_class {
 	struct gnet_stats_queue qstats;
 	struct gnet_stats_rate_est64 rate_est;
 	unsigned int	level;		/* class level in hierarchy */
-	struct tcf_proto *filter_list;	/* filter list */
+	struct tcf_proto __rcu *filter_list; /* filter list */
 	unsigned int	filter_cnt;	/* filter count */
 
 	struct hfsc_sched *sched;	/* scheduler data */
@@ -1161,7 +1161,7 @@ hfsc_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
 
 	*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
 	head = &q->root;
-	tcf = q->root.filter_list;
+	tcf = rcu_dereference_bh(q->root.filter_list);
 	while (tcf && (result = tc_classify(skb, tcf, &res)) >= 0) {
 #ifdef CONFIG_NET_CLS_ACT
 		switch (result) {
@@ -1185,7 +1185,7 @@ hfsc_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
 			return cl; /* hit leaf class */
 
 		/* apply inner filter chain */
-		tcf = cl->filter_list;
+		tcf = rcu_dereference_bh(cl->filter_list);
 		head = cl;
 	}
 
@@ -1285,7 +1285,7 @@ hfsc_unbind_tcf(struct Qdisc *sch, unsigned long arg)
 	cl->filter_cnt--;
 }
 
-static struct tcf_proto **
+static struct tcf_proto __rcu **
 hfsc_tcf_chain(struct Qdisc *sch, unsigned long arg)
 {
 	struct hfsc_sched *q = qdisc_priv(sch);

net/sched/sch_htb.c

@@ -103,7 +103,7 @@ struct htb_class {
 	u32			prio;		/* these two are used only by leaves... */
 	int			quantum;	/* but stored for parent-to-leaf return */
 
-	struct tcf_proto	*filter_list;	/* class attached filters */
+	struct tcf_proto __rcu	*filter_list;	/* class attached filters */
 	int			filter_cnt;
 	int			refcnt;		/* usage count of this class */
 
@@ -153,7 +153,7 @@ struct htb_sched {
 	int			rate2quantum;	/* quant = rate / rate2quantum */
 
 	/* filters for qdisc itself */
-	struct tcf_proto	*filter_list;
+	struct tcf_proto __rcu	*filter_list;
 
 #define HTB_WARN_TOOMANYEVENTS	0x1
 	unsigned int		warned;	/* only one warning */
@@ -223,9 +223,9 @@ static struct htb_class *htb_classify(struct sk_buff *skb, struct Qdisc *sch,
 		if (cl->level == 0)
 			return cl;
 		/* Start with inner filter chain if a non-leaf class is selected */
-		tcf = cl->filter_list;
+		tcf = rcu_dereference_bh(cl->filter_list);
 	} else {
-		tcf = q->filter_list;
+		tcf = rcu_dereference_bh(q->filter_list);
 	}
 
 	*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
@@ -251,7 +251,7 @@ static struct htb_class *htb_classify(struct sk_buff *skb, struct Qdisc *sch,
 			return cl;	/* we hit leaf; return it */
 
 		/* we have got inner class; apply inner filter chain */
-		tcf = cl->filter_list;
+		tcf = rcu_dereference_bh(cl->filter_list);
 	}
 	/* classification failed; try to use default class */
 	cl = htb_find(TC_H_MAKE(TC_H_MAJ(sch->handle), q->defcls), sch);
@@ -1519,11 +1519,12 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
 	return err;
 }
 
-static struct tcf_proto **htb_find_tcf(struct Qdisc *sch, unsigned long arg)
+static struct tcf_proto __rcu **htb_find_tcf(struct Qdisc *sch,
+					     unsigned long arg)
 {
 	struct htb_sched *q = qdisc_priv(sch);
 	struct htb_class *cl = (struct htb_class *)arg;
-	struct tcf_proto **fl = cl ? &cl->filter_list : &q->filter_list;
+	struct tcf_proto __rcu **fl = cl ? &cl->filter_list : &q->filter_list;
 
 	return fl;
 }

net/sched/sch_ingress.c

@@ -17,7 +17,7 @@
 
 
 struct ingress_qdisc_data {
-	struct tcf_proto	*filter_list;
+	struct tcf_proto __rcu	*filter_list;
 };
 
 /* ------------------------- Class/flow operations ------------------------- */
@@ -46,7 +46,8 @@ static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker)
 {
 }
 
-static struct tcf_proto **ingress_find_tcf(struct Qdisc *sch, unsigned long cl)
+static struct tcf_proto __rcu **ingress_find_tcf(struct Qdisc *sch,
+						 unsigned long cl)
 {
 	struct ingress_qdisc_data *p = qdisc_priv(sch);
 
@@ -59,9 +60,10 @@ 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, p->filter_list, &res);
+	result = tc_classify(skb, fl, &res);
 
 	qdisc_bstats_update(sch, skb);
 	switch (result) {

net/sched/sch_multiq.c

@@ -31,7 +31,7 @@ struct multiq_sched_data {
 	u16 bands;
 	u16 max_bands;
 	u16 curband;
-	struct tcf_proto *filter_list;
+	struct tcf_proto __rcu *filter_list;
 	struct Qdisc **queues;
 };
 
@@ -42,10 +42,11 @@ multiq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
 	struct multiq_sched_data *q = qdisc_priv(sch);
 	u32 band;
 	struct tcf_result res;
+	struct tcf_proto *fl = rcu_dereference_bh(q->filter_list);
 	int err;
 
 	*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
-	err = tc_classify(skb, q->filter_list, &res);
+	err = tc_classify(skb, fl, &res);
 #ifdef CONFIG_NET_CLS_ACT
 	switch (err) {
 	case TC_ACT_STOLEN:
@@ -388,7 +389,8 @@ static void multiq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
 	}
 }
 
-static struct tcf_proto **multiq_find_tcf(struct Qdisc *sch, unsigned long cl)
+static struct tcf_proto __rcu **multiq_find_tcf(struct Qdisc *sch,
+						unsigned long cl)
 {
 	struct multiq_sched_data *q = qdisc_priv(sch);
 

net/sched/sch_prio.c

@@ -24,7 +24,7 @@
 
 struct prio_sched_data {
 	int bands;
-	struct tcf_proto *filter_list;
+	struct tcf_proto __rcu *filter_list;
 	u8  prio2band[TC_PRIO_MAX+1];
 	struct Qdisc *queues[TCQ_PRIO_BANDS];
 };
@@ -36,11 +36,13 @@ prio_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
 	struct prio_sched_data *q = qdisc_priv(sch);
 	u32 band = skb->priority;
 	struct tcf_result res;
+	struct tcf_proto *fl;
 	int err;
 
 	*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
 	if (TC_H_MAJ(skb->priority) != sch->handle) {
-		err = tc_classify(skb, q->filter_list, &res);
+		fl = rcu_dereference_bh(q->filter_list);
+		err = tc_classify(skb, fl, &res);
 #ifdef CONFIG_NET_CLS_ACT
 		switch (err) {
 		case TC_ACT_STOLEN:
@@ -50,7 +52,7 @@ prio_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
 			return NULL;
 		}
 #endif
-		if (!q->filter_list || err < 0) {
+		if (!fl || err < 0) {
 			if (TC_H_MAJ(band))
 				band = 0;
 			return q->queues[q->prio2band[band & TC_PRIO_MAX]];
@@ -351,7 +353,8 @@ static void prio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
 	}
 }
 
-static struct tcf_proto **prio_find_tcf(struct Qdisc *sch, unsigned long cl)
+static struct tcf_proto __rcu **prio_find_tcf(struct Qdisc *sch,
+					      unsigned long cl)
 {
 	struct prio_sched_data *q = qdisc_priv(sch);
 

net/sched/sch_qfq.c

@@ -181,7 +181,7 @@ struct qfq_group {
 };
 
 struct qfq_sched {
-	struct tcf_proto *filter_list;
+	struct tcf_proto __rcu *filter_list;
 	struct Qdisc_class_hash clhash;
 
 	u64			oldV, V;	/* Precise virtual times. */
@@ -576,7 +576,8 @@ static void qfq_put_class(struct Qdisc *sch, unsigned long arg)
 		qfq_destroy_class(sch, cl);
 }
 
-static struct tcf_proto **qfq_tcf_chain(struct Qdisc *sch, unsigned long cl)
+static struct tcf_proto __rcu **qfq_tcf_chain(struct Qdisc *sch,
+					      unsigned long cl)
 {
 	struct qfq_sched *q = qdisc_priv(sch);
 
@@ -704,6 +705,7 @@ static struct qfq_class *qfq_classify(struct sk_buff *skb, struct Qdisc *sch,
 	struct qfq_sched *q = qdisc_priv(sch);
 	struct qfq_class *cl;
 	struct tcf_result res;
+	struct tcf_proto *fl;
 	int result;
 
 	if (TC_H_MAJ(skb->priority ^ sch->handle) == 0) {
@@ -714,7 +716,8 @@ static struct qfq_class *qfq_classify(struct sk_buff *skb, struct Qdisc *sch,
 	}
 
 	*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
-	result = tc_classify(skb, q->filter_list, &res);
+	fl = rcu_dereference_bh(q->filter_list);
+	result = tc_classify(skb, fl, &res);
 	if (result >= 0) {
 #ifdef CONFIG_NET_CLS_ACT
 		switch (result) {

net/sched/sch_sfb.c

@@ -55,7 +55,7 @@ struct sfb_bins {
 
 struct sfb_sched_data {
 	struct Qdisc	*qdisc;
-	struct tcf_proto *filter_list;
+	struct tcf_proto __rcu *filter_list;
 	unsigned long	rehash_interval;
 	unsigned long	warmup_time;	/* double buffering warmup time in jiffies */
 	u32		max;
@@ -253,13 +253,13 @@ static bool sfb_rate_limit(struct sk_buff *skb, struct sfb_sched_data *q)
 	return false;
 }
 
-static bool sfb_classify(struct sk_buff *skb, struct sfb_sched_data *q,
+static bool sfb_classify(struct sk_buff *skb, struct tcf_proto *fl,
 			 int *qerr, u32 *salt)
 {
 	struct tcf_result res;
 	int result;
 
-	result = tc_classify(skb, q->filter_list, &res);
+	result = tc_classify(skb, fl, &res);
 	if (result >= 0) {
 #ifdef CONFIG_NET_CLS_ACT
 		switch (result) {
@@ -281,6 +281,7 @@ static int sfb_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 
 	struct sfb_sched_data *q = qdisc_priv(sch);
 	struct Qdisc *child = q->qdisc;
+	struct tcf_proto *fl;
 	int i;
 	u32 p_min = ~0;
 	u32 minqlen = ~0;
@@ -306,9 +307,10 @@ static int sfb_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 		}
 	}
 
-	if (q->filter_list) {
+	fl = rcu_dereference_bh(q->filter_list);
+	if (fl) {
 		/* If using external classifiers, get result and record it. */
-		if (!sfb_classify(skb, q, &ret, &salt))
+		if (!sfb_classify(skb, fl, &ret, &salt))
 			goto other_drop;
 		keys.src = salt;
 		keys.dst = 0;
@@ -660,7 +662,8 @@ static void sfb_walk(struct Qdisc *sch, struct qdisc_walker *walker)
 	}
 }
 
-static struct tcf_proto **sfb_find_tcf(struct Qdisc *sch, unsigned long cl)
+static struct tcf_proto __rcu **sfb_find_tcf(struct Qdisc *sch,
+					     unsigned long cl)
 {
 	struct sfb_sched_data *q = qdisc_priv(sch);
 

net/sched/sch_sfq.c

@@ -125,7 +125,7 @@ struct sfq_sched_data {
 	u8		cur_depth;	/* depth of longest slot */
 	u8		flags;
 	unsigned short  scaled_quantum; /* SFQ_ALLOT_SIZE(quantum) */
-	struct tcf_proto *filter_list;
+	struct tcf_proto __rcu *filter_list;
 	sfq_index	*ht;		/* Hash table ('divisor' slots) */
 	struct sfq_slot	*slots;		/* Flows table ('maxflows' entries) */
 
@@ -187,6 +187,7 @@ static unsigned int sfq_classify(struct sk_buff *skb, struct Qdisc *sch,
 {
 	struct sfq_sched_data *q = qdisc_priv(sch);
 	struct tcf_result res;
+	struct tcf_proto *fl;
 	int result;
 
 	if (TC_H_MAJ(skb->priority) == sch->handle &&
@@ -194,13 +195,14 @@ static unsigned int sfq_classify(struct sk_buff *skb, struct Qdisc *sch,
 	    TC_H_MIN(skb->priority) <= q->divisor)
 		return TC_H_MIN(skb->priority);
 
-	if (!q->filter_list) {
+	fl = rcu_dereference_bh(q->filter_list);
+	if (!fl) {
 		skb_flow_dissect(skb, &sfq_skb_cb(skb)->keys);
 		return sfq_hash(q, skb) + 1;
 	}
 
 	*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
-	result = tc_classify(skb, q->filter_list, &res);
+	result = tc_classify(skb, fl, &res);
 	if (result >= 0) {
 #ifdef CONFIG_NET_CLS_ACT
 		switch (result) {
@@ -836,7 +838,8 @@ static void sfq_put(struct Qdisc *q, unsigned long cl)
 {
 }
 
-static struct tcf_proto **sfq_find_tcf(struct Qdisc *sch, unsigned long cl)
+static struct tcf_proto __rcu **sfq_find_tcf(struct Qdisc *sch,
+					     unsigned long cl)
 {
 	struct sfq_sched_data *q = qdisc_priv(sch);