Merge branch 'tc-bind_class-hook'

Zhengchao Shao says:

====================
refactor duplicate codes in bind_class hook function

All the bind_class callback duplicate the same logic, so we can refactor
them. First, ensure n arg not empty before call bind_class hook function.
Then, add tc_cls_bind_class() helper. Last, use tc_cls_bind_class() in
filter.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/pkt_cls.h

@@ -210,6 +210,18 @@ tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r)
 	__tcf_unbind_filter(q, r);
 }
 
+static inline void tc_cls_bind_class(u32 classid, unsigned long cl,
+				     void *q, struct tcf_result *res,
+				     unsigned long base)
+{
+	if (res->classid == classid) {
+		if (cl)
+			__tcf_bind_filter(q, res, base);
+		else
+			__tcf_unbind_filter(q, res);
+	}
+}
+
 struct tcf_exts {
 #ifdef CONFIG_NET_CLS_ACT
 	__u32	type; /* for backward compat(TCA_OLD_COMPAT) */

net/sched/cls_basic.c

@@ -261,12 +261,7 @@ static void basic_bind_class(void *fh, u32 classid, unsigned long cl, void *q,
 {
 	struct basic_filter *f = fh;
 
-	if (f && f->res.classid == classid) {
-		if (cl)
-			__tcf_bind_filter(q, &f->res, base);
-		else
-			__tcf_unbind_filter(q, &f->res);
-	}
+	tc_cls_bind_class(classid, cl, q, &f->res, base);
 }
 
 static int basic_dump(struct net *net, struct tcf_proto *tp, void *fh,

net/sched/cls_bpf.c

@@ -635,12 +635,7 @@ static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl,
 {
 	struct cls_bpf_prog *prog = fh;
 
-	if (prog && prog->res.classid == classid) {
-		if (cl)
-			__tcf_bind_filter(q, &prog->res, base);
-		else
-			__tcf_unbind_filter(q, &prog->res);
-	}
+	tc_cls_bind_class(classid, cl, q, &prog->res, base);
 }
 
 static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg,

net/sched/cls_flower.c

@@ -3405,12 +3405,7 @@ static void fl_bind_class(void *fh, u32 classid, unsigned long cl, void *q,
 {
 	struct cls_fl_filter *f = fh;
 
-	if (f && f->res.classid == classid) {
-		if (cl)
-			__tcf_bind_filter(q, &f->res, base);
-		else
-			__tcf_unbind_filter(q, &f->res);
-	}
+	tc_cls_bind_class(classid, cl, q, &f->res, base);
 }
 
 static bool fl_delete_empty(struct tcf_proto *tp)

net/sched/cls_fw.c

@@ -416,12 +416,7 @@ static void fw_bind_class(void *fh, u32 classid, unsigned long cl, void *q,
 {
 	struct fw_filter *f = fh;
 
-	if (f && f->res.classid == classid) {
-		if (cl)
-			__tcf_bind_filter(q, &f->res, base);
-		else
-			__tcf_unbind_filter(q, &f->res);
-	}
+	tc_cls_bind_class(classid, cl, q, &f->res, base);
 }
 
 static struct tcf_proto_ops cls_fw_ops __read_mostly = {

net/sched/cls_matchall.c

@@ -394,12 +394,7 @@ static void mall_bind_class(void *fh, u32 classid, unsigned long cl, void *q,
 {
 	struct cls_mall_head *head = fh;
 
-	if (head && head->res.classid == classid) {
-		if (cl)
-			__tcf_bind_filter(q, &head->res, base);
-		else
-			__tcf_unbind_filter(q, &head->res);
-	}
+	tc_cls_bind_class(classid, cl, q, &head->res, base);
 }
 
 static struct tcf_proto_ops cls_mall_ops __read_mostly = {

net/sched/cls_route.c

@@ -649,12 +649,7 @@ static void route4_bind_class(void *fh, u32 classid, unsigned long cl, void *q,
 {
 	struct route4_filter *f = fh;
 
-	if (f && f->res.classid == classid) {
-		if (cl)
-			__tcf_bind_filter(q, &f->res, base);
-		else
-			__tcf_unbind_filter(q, &f->res);
-	}
+	tc_cls_bind_class(classid, cl, q, &f->res, base);
 }
 
 static struct tcf_proto_ops cls_route4_ops __read_mostly = {

net/sched/cls_rsvp.h

@@ -733,12 +733,7 @@ static void rsvp_bind_class(void *fh, u32 classid, unsigned long cl, void *q,
 {
 	struct rsvp_filter *f = fh;
 
-	if (f && f->res.classid == classid) {
-		if (cl)
-			__tcf_bind_filter(q, &f->res, base);
-		else
-			__tcf_unbind_filter(q, &f->res);
-	}
+	tc_cls_bind_class(classid, cl, q, &f->res, base);
 }
 
 static struct tcf_proto_ops RSVP_OPS __read_mostly = {

net/sched/cls_tcindex.c

@@ -691,12 +691,7 @@ static void tcindex_bind_class(void *fh, u32 classid, unsigned long cl,
 {
 	struct tcindex_filter_result *r = fh;
 
-	if (r && r->res.classid == classid) {
-		if (cl)
-			__tcf_bind_filter(q, &r->res, base);
-		else
-			__tcf_unbind_filter(q, &r->res);
-	}
+	tc_cls_bind_class(classid, cl, q, &r->res, base);
 }
 
 static struct tcf_proto_ops cls_tcindex_ops __read_mostly = {

net/sched/cls_u32.c

@@ -1250,12 +1250,7 @@ static void u32_bind_class(void *fh, u32 classid, unsigned long cl, void *q,
 {
 	struct tc_u_knode *n = fh;
 
-	if (n && n->res.classid == classid) {
-		if (cl)
-			__tcf_bind_filter(q, &n->res, base);
-		else
-			__tcf_unbind_filter(q, &n->res);
-	}
+	tc_cls_bind_class(classid, cl, q, &n->res, base);
 }
 
 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,

net/sched/sch_api.c

@@ -1915,7 +1915,7 @@ static int tcf_node_bind(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
 {
 	struct tcf_bind_args *a = (void *)arg;
 
-	if (tp->ops->bind_class) {
+	if (n && tp->ops->bind_class) {
 		struct Qdisc *q = tcf_block_q(tp->chain->block);
 
 		sch_tree_lock(q);