net: sched: propagate extack to cls->destroy callbacks

Propagate extack to cls->destroy callbacks when called from
non-error paths.  On error paths pass NULL to avoid overwriting
the failure message.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/sch_generic.h

@@ -233,7 +233,8 @@ struct tcf_proto_ops {
 					    const struct tcf_proto *,
 					    struct tcf_result *);
 	int			(*init)(struct tcf_proto*);
-	void			(*destroy)(struct tcf_proto*);
+	void			(*destroy)(struct tcf_proto *tp,
+					   struct netlink_ext_ack *extack);
 
 	void*			(*get)(struct tcf_proto*, u32 handle);
 	int			(*change)(struct net *net, struct sk_buff *,

net/sched/cls_api.c

@@ -172,9 +172,10 @@ static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
 	return ERR_PTR(err);
 }
 
-static void tcf_proto_destroy(struct tcf_proto *tp)
+static void tcf_proto_destroy(struct tcf_proto *tp,
+			      struct netlink_ext_ack *extack)
 {
-	tp->ops->destroy(tp);
+	tp->ops->destroy(tp, extack);
 	module_put(tp->ops->owner);
 	kfree_rcu(tp, rcu);
 }
@@ -223,7 +224,7 @@ static void tcf_chain_flush(struct tcf_chain *chain)
 	tcf_chain_head_change(chain, NULL);
 	while (tp) {
 		RCU_INIT_POINTER(chain->filter_chain, tp->next);
-		tcf_proto_destroy(tp);
+		tcf_proto_destroy(tp, NULL);
 		tp = rtnl_dereference(chain->filter_chain);
 		tcf_chain_put(chain);
 	}
@@ -1182,7 +1183,7 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
 			tcf_chain_tp_remove(chain, &chain_info, tp);
 			tfilter_notify(net, skb, n, tp, block, q, parent, fh,
 				       RTM_DELTFILTER, false);
-			tcf_proto_destroy(tp);
+			tcf_proto_destroy(tp, extack);
 			err = 0;
 			goto errout;
 		}
@@ -1200,7 +1201,7 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
 		case RTM_NEWTFILTER:
 			if (n->nlmsg_flags & NLM_F_EXCL) {
 				if (tp_created)
-					tcf_proto_destroy(tp);
+					tcf_proto_destroy(tp, NULL);
 				NL_SET_ERR_MSG(extack, "Filter already exists");
 				err = -EEXIST;
 				goto errout;
@@ -1214,7 +1215,7 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
 				goto errout;
 			if (last) {
 				tcf_chain_tp_remove(chain, &chain_info, tp);
-				tcf_proto_destroy(tp);
+				tcf_proto_destroy(tp, extack);
 			}
 			goto errout;
 		case RTM_GETTFILTER:
@@ -1240,7 +1241,7 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
 			       RTM_NEWTFILTER, false);
 	} else {
 		if (tp_created)
-			tcf_proto_destroy(tp);
+			tcf_proto_destroy(tp, NULL);
 	}
 
 errout:

net/sched/cls_basic.c

@@ -112,7 +112,7 @@ static void basic_delete_filter(struct rcu_head *head)
 	tcf_queue_work(&f->work);
 }
 
-static void basic_destroy(struct tcf_proto *tp)
+static void basic_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
 {
 	struct basic_head *head = rtnl_dereference(tp->root);
 	struct basic_filter *f, *n;

net/sched/cls_bpf.c

@@ -314,7 +314,8 @@ static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last,
 	return 0;
 }
 
-static void cls_bpf_destroy(struct tcf_proto *tp)
+static void cls_bpf_destroy(struct tcf_proto *tp,
+			    struct netlink_ext_ack *extack)
 {
 	struct cls_bpf_head *head = rtnl_dereference(tp->root);
 	struct cls_bpf_prog *prog, *tmp;

net/sched/cls_cgroup.c

@@ -143,7 +143,8 @@ static int cls_cgroup_change(struct net *net, struct sk_buff *in_skb,
 	return err;
 }
 
-static void cls_cgroup_destroy(struct tcf_proto *tp)
+static void cls_cgroup_destroy(struct tcf_proto *tp,
+			       struct netlink_ext_ack *extack)
 {
 	struct cls_cgroup_head *head = rtnl_dereference(tp->root);
 

net/sched/cls_flow.c

@@ -600,7 +600,7 @@ static int flow_init(struct tcf_proto *tp)
 	return 0;
 }
 
-static void flow_destroy(struct tcf_proto *tp)
+static void flow_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
 {
 	struct flow_head *head = rtnl_dereference(tp->root);
 	struct flow_filter *f, *next;

net/sched/cls_flower.c

@@ -315,7 +315,7 @@ static void fl_destroy_rcu(struct rcu_head *rcu)
 	schedule_work(&head->work);
 }
 
-static void fl_destroy(struct tcf_proto *tp)
+static void fl_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
 {
 	struct cls_fl_head *head = rtnl_dereference(tp->root);
 	struct cls_fl_filter *f, *next;

net/sched/cls_fw.c

@@ -149,7 +149,7 @@ static void fw_delete_filter(struct rcu_head *head)
 	tcf_queue_work(&f->work);
 }
 
-static void fw_destroy(struct tcf_proto *tp)
+static void fw_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
 {
 	struct fw_head *head = rtnl_dereference(tp->root);
 	struct fw_filter *f;

net/sched/cls_matchall.c

@@ -114,7 +114,7 @@ static int mall_replace_hw_filter(struct tcf_proto *tp,
 	return 0;
 }
 
-static void mall_destroy(struct tcf_proto *tp)
+static void mall_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
 {
 	struct cls_mall_head *head = rtnl_dereference(tp->root);
 

net/sched/cls_route.c

@@ -281,7 +281,7 @@ static void route4_delete_filter(struct rcu_head *head)
 	tcf_queue_work(&f->work);
 }
 
-static void route4_destroy(struct tcf_proto *tp)
+static void route4_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
 {
 	struct route4_head *head = rtnl_dereference(tp->root);
 	int h1, h2;

net/sched/cls_rsvp.h

@@ -322,7 +322,7 @@ static void rsvp_delete_filter(struct tcf_proto *tp, struct rsvp_filter *f)
 		__rsvp_delete_filter(f);
 }
 
-static void rsvp_destroy(struct tcf_proto *tp)
+static void rsvp_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
 {
 	struct rsvp_head *data = rtnl_dereference(tp->root);
 	int h1, h2;

net/sched/cls_tcindex.c

@@ -581,7 +581,8 @@ static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker)
 	}
 }
 
-static void tcindex_destroy(struct tcf_proto *tp)
+static void tcindex_destroy(struct tcf_proto *tp,
+			    struct netlink_ext_ack *extack)
 {
 	struct tcindex_data *p = rtnl_dereference(tp->root);
 	struct tcf_walker walker;

net/sched/cls_u32.c

@@ -638,7 +638,7 @@ static bool ht_empty(struct tc_u_hnode *ht)
 	return true;
 }
 
-static void u32_destroy(struct tcf_proto *tp)
+static void u32_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
 {
 	struct tc_u_common *tp_c = tp->data;
 	struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);