flow_offload: move tc indirect block to flow offload

move tc indirect block to flow_offload and rename
it to flow indirect block.The nf_tables can use the
indr block architecture.

Signed-off-by: wenxu <wenxu@ucloud.cn>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 240 insertions, 215 deletions

diff --git a/net/core/flow_offload.c b/net/core/flow_offload.c
index d63b970784dc..4cc18e462d50 100644
--- a/net/core/flow_offload.c
+++ b/net/core/flow_offload.c
@@ -2,6 +2,7 @@
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <net/flow_offload.h>
+#include <linux/rtnetlink.h>
 
 struct flow_rule *flow_rule_alloc(unsigned int num_actions)
 {
@@ -280,3 +281,217 @@ int flow_block_cb_setup_simple(struct flow_block_offload *f,
 	}
 }
 EXPORT_SYMBOL(flow_block_cb_setup_simple);
+
+static struct rhashtable indr_setup_block_ht;
+
+struct flow_indr_block_cb {
+	struct list_head list;
+	void *cb_priv;
+	flow_indr_block_bind_cb_t *cb;
+	void *cb_ident;
+};
+
+struct flow_indr_block_dev {
+	struct rhash_head ht_node;
+	struct net_device *dev;
+	unsigned int refcnt;
+	flow_indr_block_ing_cmd_t  *block_ing_cmd_cb;
+	struct list_head cb_list;
+};
+
+static const struct rhashtable_params flow_indr_setup_block_ht_params = {
+	.key_offset	= offsetof(struct flow_indr_block_dev, dev),
+	.head_offset	= offsetof(struct flow_indr_block_dev, ht_node),
+	.key_len	= sizeof(struct net_device *),
+};
+
+static struct flow_indr_block_dev *
+flow_indr_block_dev_lookup(struct net_device *dev)
+{
+	return rhashtable_lookup_fast(&indr_setup_block_ht, &dev,
+				      flow_indr_setup_block_ht_params);
+}
+
+static struct flow_indr_block_dev *
+flow_indr_block_dev_get(struct net_device *dev)
+{
+	struct flow_indr_block_dev *indr_dev;
+
+	indr_dev = flow_indr_block_dev_lookup(dev);
+	if (indr_dev)
+		goto inc_ref;
+
+	indr_dev = kzalloc(sizeof(*indr_dev), GFP_KERNEL);
+	if (!indr_dev)
+		return NULL;
+
+	INIT_LIST_HEAD(&indr_dev->cb_list);
+	indr_dev->dev = dev;
+	if (rhashtable_insert_fast(&indr_setup_block_ht, &indr_dev->ht_node,
+				   flow_indr_setup_block_ht_params)) {
+		kfree(indr_dev);
+		return NULL;
+	}
+
+inc_ref:
+	indr_dev->refcnt++;
+	return indr_dev;
+}
+
+static void flow_indr_block_dev_put(struct flow_indr_block_dev *indr_dev)
+{
+	if (--indr_dev->refcnt)
+		return;
+
+	rhashtable_remove_fast(&indr_setup_block_ht, &indr_dev->ht_node,
+			       flow_indr_setup_block_ht_params);
+	kfree(indr_dev);
+}
+
+static struct flow_indr_block_cb *
+flow_indr_block_cb_lookup(struct flow_indr_block_dev *indr_dev,
+			  flow_indr_block_bind_cb_t *cb, void *cb_ident)
+{
+	struct flow_indr_block_cb *indr_block_cb;
+
+	list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list)
+		if (indr_block_cb->cb == cb &&
+		    indr_block_cb->cb_ident == cb_ident)
+			return indr_block_cb;
+	return NULL;
+}
+
+static struct flow_indr_block_cb *
+flow_indr_block_cb_add(struct flow_indr_block_dev *indr_dev, void *cb_priv,
+		       flow_indr_block_bind_cb_t *cb, void *cb_ident)
+{
+	struct flow_indr_block_cb *indr_block_cb;
+
+	indr_block_cb = flow_indr_block_cb_lookup(indr_dev, cb, cb_ident);
+	if (indr_block_cb)
+		return ERR_PTR(-EEXIST);
+
+	indr_block_cb = kzalloc(sizeof(*indr_block_cb), GFP_KERNEL);
+	if (!indr_block_cb)
+		return ERR_PTR(-ENOMEM);
+
+	indr_block_cb->cb_priv = cb_priv;
+	indr_block_cb->cb = cb;
+	indr_block_cb->cb_ident = cb_ident;
+	list_add(&indr_block_cb->list, &indr_dev->cb_list);
+
+	return indr_block_cb;
+}
+
+static void flow_indr_block_cb_del(struct flow_indr_block_cb *indr_block_cb)
+{
+	list_del(&indr_block_cb->list);
+	kfree(indr_block_cb);
+}
+
+int __flow_indr_block_cb_register(struct net_device *dev, void *cb_priv,
+				  flow_indr_block_bind_cb_t *cb,
+				  void *cb_ident)
+{
+	struct flow_indr_block_cb *indr_block_cb;
+	struct flow_indr_block_dev *indr_dev;
+	int err;
+
+	indr_dev = flow_indr_block_dev_get(dev);
+	if (!indr_dev)
+		return -ENOMEM;
+
+	indr_block_cb = flow_indr_block_cb_add(indr_dev, cb_priv, cb, cb_ident);
+	err = PTR_ERR_OR_ZERO(indr_block_cb);
+	if (err)
+		goto err_dev_put;
+
+	if (indr_dev->block_ing_cmd_cb)
+		indr_dev->block_ing_cmd_cb(dev, indr_block_cb->cb,
+					   indr_block_cb->cb_priv,
+					   FLOW_BLOCK_BIND);
+
+	return 0;
+
+err_dev_put:
+	flow_indr_block_dev_put(indr_dev);
+	return err;
+}
+EXPORT_SYMBOL_GPL(__flow_indr_block_cb_register);
+
+int flow_indr_block_cb_register(struct net_device *dev, void *cb_priv,
+				flow_indr_block_bind_cb_t *cb,
+				void *cb_ident)
+{
+	int err;
+
+	rtnl_lock();
+	err = __flow_indr_block_cb_register(dev, cb_priv, cb, cb_ident);
+	rtnl_unlock();
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(flow_indr_block_cb_register);
+
+void __flow_indr_block_cb_unregister(struct net_device *dev,
+				     flow_indr_block_bind_cb_t *cb,
+				     void *cb_ident)
+{
+	struct flow_indr_block_cb *indr_block_cb;
+	struct flow_indr_block_dev *indr_dev;
+
+	indr_dev = flow_indr_block_dev_lookup(dev);
+	if (!indr_dev)
+		return;
+
+	indr_block_cb = flow_indr_block_cb_lookup(indr_dev, cb, cb_ident);
+	if (!indr_block_cb)
+		return;
+
+	if (indr_dev->block_ing_cmd_cb)
+		indr_dev->block_ing_cmd_cb(dev, indr_block_cb->cb,
+					   indr_block_cb->cb_priv,
+					   FLOW_BLOCK_UNBIND);
+
+	flow_indr_block_cb_del(indr_block_cb);
+	flow_indr_block_dev_put(indr_dev);
+}
+EXPORT_SYMBOL_GPL(__flow_indr_block_cb_unregister);
+
+void flow_indr_block_cb_unregister(struct net_device *dev,
+				   flow_indr_block_bind_cb_t *cb,
+				   void *cb_ident)
+{
+	rtnl_lock();
+	__flow_indr_block_cb_unregister(dev, cb, cb_ident);
+	rtnl_unlock();
+}
+EXPORT_SYMBOL_GPL(flow_indr_block_cb_unregister);
+
+void flow_indr_block_call(struct net_device *dev,
+			  flow_indr_block_ing_cmd_t cb,
+			  struct flow_block_offload *bo,
+			  enum flow_block_command command)
+{
+	struct flow_indr_block_cb *indr_block_cb;
+	struct flow_indr_block_dev *indr_dev;
+
+	indr_dev = flow_indr_block_dev_lookup(dev);
+	if (!indr_dev)
+		return;
+
+	indr_dev->block_ing_cmd_cb = command == FLOW_BLOCK_BIND
+				     ? cb : NULL;
+
+	list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list)
+		indr_block_cb->cb(dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK,
+				  bo);
+}
+EXPORT_SYMBOL_GPL(flow_indr_block_call);
+
+static int __init init_flow_indr_rhashtable(void)
+{
+	return rhashtable_init(&indr_setup_block_ht,
+			       &flow_indr_setup_block_ht_params);
+}
+subsys_initcall(init_flow_indr_rhashtable);
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 7c34fc6851c3..0b0dde26783d 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -37,6 +37,7 @@
 #include <net/tc_act/tc_skbedit.h>
 #include <net/tc_act/tc_ct.h>
 #include <net/tc_act/tc_mpls.h>
+#include <net/flow_offload.h>
 
 extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
 
@@ -545,139 +546,12 @@ static void tcf_chain_flush(struct tcf_chain *chain, bool rtnl_held)
 	}
 }
 
-static struct tcf_block *tc_dev_ingress_block(struct net_device *dev)
-{
-	const struct Qdisc_class_ops *cops;
-	struct Qdisc *qdisc;
-
-	if (!dev_ingress_queue(dev))
-		return NULL;
-
-	qdisc = dev_ingress_queue(dev)->qdisc_sleeping;
-	if (!qdisc)
-		return NULL;
-
-	cops = qdisc->ops->cl_ops;
-	if (!cops)
-		return NULL;
-
-	if (!cops->tcf_block)
-		return NULL;
-
-	return cops->tcf_block(qdisc, TC_H_MIN_INGRESS, NULL);
-}
-
-static struct rhashtable indr_setup_block_ht;
-
-struct tc_indr_block_dev {
-	struct rhash_head ht_node;
-	struct net_device *dev;
-	unsigned int refcnt;
-	struct list_head cb_list;
-};
-
-struct tc_indr_block_cb {
-	struct list_head list;
-	void *cb_priv;
-	tc_indr_block_bind_cb_t *cb;
-	void *cb_ident;
-};
-
-static const struct rhashtable_params tc_indr_setup_block_ht_params = {
-	.key_offset	= offsetof(struct tc_indr_block_dev, dev),
-	.head_offset	= offsetof(struct tc_indr_block_dev, ht_node),
-	.key_len	= sizeof(struct net_device *),
-};
-
-static struct tc_indr_block_dev *
-tc_indr_block_dev_lookup(struct net_device *dev)
-{
-	return rhashtable_lookup_fast(&indr_setup_block_ht, &dev,
-				      tc_indr_setup_block_ht_params);
-}
-
-static struct tc_indr_block_dev *tc_indr_block_dev_get(struct net_device *dev)
-{
-	struct tc_indr_block_dev *indr_dev;
-
-	indr_dev = tc_indr_block_dev_lookup(dev);
-	if (indr_dev)
-		goto inc_ref;
-
-	indr_dev = kzalloc(sizeof(*indr_dev), GFP_KERNEL);
-	if (!indr_dev)
-		return NULL;
-
-	INIT_LIST_HEAD(&indr_dev->cb_list);
-	indr_dev->dev = dev;
-	if (rhashtable_insert_fast(&indr_setup_block_ht, &indr_dev->ht_node,
-				   tc_indr_setup_block_ht_params)) {
-		kfree(indr_dev);
-		return NULL;
-	}
-
-inc_ref:
-	indr_dev->refcnt++;
-	return indr_dev;
-}
-
-static void tc_indr_block_dev_put(struct tc_indr_block_dev *indr_dev)
-{
-	if (--indr_dev->refcnt)
-		return;
-
-	rhashtable_remove_fast(&indr_setup_block_ht, &indr_dev->ht_node,
-			       tc_indr_setup_block_ht_params);
-	kfree(indr_dev);
-}
-
-static struct tc_indr_block_cb *
-tc_indr_block_cb_lookup(struct tc_indr_block_dev *indr_dev,
-			tc_indr_block_bind_cb_t *cb, void *cb_ident)
-{
-	struct tc_indr_block_cb *indr_block_cb;
-
-	list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list)
-		if (indr_block_cb->cb == cb &&
-		    indr_block_cb->cb_ident == cb_ident)
-			return indr_block_cb;
-	return NULL;
-}
-
-static struct tc_indr_block_cb *
-tc_indr_block_cb_add(struct tc_indr_block_dev *indr_dev, void *cb_priv,
-		     tc_indr_block_bind_cb_t *cb, void *cb_ident)
-{
-	struct tc_indr_block_cb *indr_block_cb;
-
-	indr_block_cb = tc_indr_block_cb_lookup(indr_dev, cb, cb_ident);
-	if (indr_block_cb)
-		return ERR_PTR(-EEXIST);
-
-	indr_block_cb = kzalloc(sizeof(*indr_block_cb), GFP_KERNEL);
-	if (!indr_block_cb)
-		return ERR_PTR(-ENOMEM);
-
-	indr_block_cb->cb_priv = cb_priv;
-	indr_block_cb->cb = cb;
-	indr_block_cb->cb_ident = cb_ident;
-	list_add(&indr_block_cb->list, &indr_dev->cb_list);
-
-	return indr_block_cb;
-}
-
-static void tc_indr_block_cb_del(struct tc_indr_block_cb *indr_block_cb)
-{
-	list_del(&indr_block_cb->list);
-	kfree(indr_block_cb);
-}
-
 static int tcf_block_setup(struct tcf_block *block,
 			   struct flow_block_offload *bo);
 
 static void tc_indr_block_ing_cmd(struct net_device *dev,
 				  struct tcf_block *block,
-				  tc_indr_block_bind_cb_t *cb,
+				  flow_indr_block_bind_cb_t *cb,
 				  void *cb_priv,
 				  enum flow_block_command command)
 {
@@ -699,97 +573,40 @@ static void tc_indr_block_ing_cmd(struct net_device *dev,
 	tcf_block_setup(block, &bo);
 }
 
-int __tc_indr_block_cb_register(struct net_device *dev, void *cb_priv,
-				tc_indr_block_bind_cb_t *cb, void *cb_ident)
-{
-	struct tc_indr_block_cb *indr_block_cb;
-	struct tc_indr_block_dev *indr_dev;
-	struct tcf_block *block;
-	int err;
-
-	indr_dev = tc_indr_block_dev_get(dev);
-	if (!indr_dev)
-		return -ENOMEM;
-
-	indr_block_cb = tc_indr_block_cb_add(indr_dev, cb_priv, cb, cb_ident);
-	err = PTR_ERR_OR_ZERO(indr_block_cb);
-	if (err)
-		goto err_dev_put;
-
-	block = tc_dev_ingress_block(dev);
-	tc_indr_block_ing_cmd(dev, block, indr_block_cb->cb,
-			      indr_block_cb->cb_priv, FLOW_BLOCK_BIND);
-	return 0;
-
-err_dev_put:
-	tc_indr_block_dev_put(indr_dev);
-	return err;
-}
-EXPORT_SYMBOL_GPL(__tc_indr_block_cb_register);
-
-int tc_indr_block_cb_register(struct net_device *dev, void *cb_priv,
-			      tc_indr_block_bind_cb_t *cb, void *cb_ident)
+static struct tcf_block *tc_dev_ingress_block(struct net_device *dev)
 {
-	int err;
-
-	rtnl_lock();
-	err = __tc_indr_block_cb_register(dev, cb_priv, cb, cb_ident);
-	rtnl_unlock();
-
-	return err;
-}
-EXPORT_SYMBOL_GPL(tc_indr_block_cb_register);
+	const struct Qdisc_class_ops *cops;
+	struct Qdisc *qdisc;
 
-void __tc_indr_block_cb_unregister(struct net_device *dev,
-				   tc_indr_block_bind_cb_t *cb, void *cb_ident)
-{
-	struct tc_indr_block_cb *indr_block_cb;
-	struct tc_indr_block_dev *indr_dev;
-	struct tcf_block *block;
+	if (!dev_ingress_queue(dev))
+		return NULL;
 
-	indr_dev = tc_indr_block_dev_lookup(dev);
-	if (!indr_dev)
-		return;
+	qdisc = dev_ingress_queue(dev)->qdisc_sleeping;
+	if (!qdisc)
+		return NULL;
 
-	indr_block_cb = tc_indr_block_cb_lookup(indr_dev, cb, cb_ident);
-	if (!indr_block_cb)
-		return;
+	cops = qdisc->ops->cl_ops;
+	if (!cops)
+		return NULL;
 
-	/* Send unbind message if required to free any block cbs. */
-	block = tc_dev_ingress_block(dev);
-	tc_indr_block_ing_cmd(dev, block, indr_block_cb->cb,
-			      indr_block_cb->cb_priv, FLOW_BLOCK_UNBIND);
-	tc_indr_block_cb_del(indr_block_cb);
-	tc_indr_block_dev_put(indr_dev);
-}
-EXPORT_SYMBOL_GPL(__tc_indr_block_cb_unregister);
+	if (!cops->tcf_block)
+		return NULL;
 
-void tc_indr_block_cb_unregister(struct net_device *dev,
-				 tc_indr_block_bind_cb_t *cb, void *cb_ident)
-{
-	rtnl_lock();
-	__tc_indr_block_cb_unregister(dev, cb, cb_ident);
-	rtnl_unlock();
+	return cops->tcf_block(qdisc, TC_H_MIN_INGRESS, NULL);
 }
-EXPORT_SYMBOL_GPL(tc_indr_block_cb_unregister);
 
-static void flow_indr_block_call(struct net_device *dev,
-				 struct flow_block_offload *bo,
-				 enum flow_block_command command)
+static void tc_indr_block_get_and_ing_cmd(struct net_device *dev,
+					  flow_indr_block_bind_cb_t *cb,
+					  void *cb_priv,
+					  enum flow_block_command command)
 {
-	struct tc_indr_block_cb *indr_block_cb;
-	struct tc_indr_block_dev *indr_dev;
-
-	indr_dev = tc_indr_block_dev_lookup(dev);
-	if (!indr_dev)
-		return;
+	struct tcf_block *block = tc_dev_ingress_block(dev);
 
-	list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list)
-		indr_block_cb->cb(dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK,
-				  bo);
+	tc_indr_block_ing_cmd(dev, block, cb, cb_priv, command);
 }
 
-static void tc_indr_block_call(struct tcf_block *block, struct net_device *dev,
+static void tc_indr_block_call(struct tcf_block *block,
+			       struct net_device *dev,
 			       struct tcf_block_ext_info *ei,
 			       enum flow_block_command command,
 			       struct netlink_ext_ack *extack)
@@ -804,7 +621,7 @@ static void tc_indr_block_call(struct tcf_block *block, struct net_device *dev,
 	};
 	INIT_LIST_HEAD(&bo.cb_list);
 
-	flow_indr_block_call(dev, &bo, command);
+	flow_indr_block_call(dev, tc_indr_block_get_and_ing_cmd, &bo, command);
 	tcf_block_setup(block, &bo);
 }
 
@@ -3378,11 +3195,6 @@ static int __init tc_filter_init(void)
 	if (err)
 		goto err_register_pernet_subsys;
 
-	err = rhashtable_init(&indr_setup_block_ht,
-			      &tc_indr_setup_block_ht_params);
-	if (err)
-		goto err_rhash_setup_block_ht;
-
 	rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL,
 		      RTNL_FLAG_DOIT_UNLOCKED);
 	rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL,
@@ -3396,8 +3208,6 @@ static int __init tc_filter_init(void)
 
 	return 0;
 
-err_rhash_setup_block_ht:
-	unregister_pernet_subsys(&tcf_net_ops);
 err_register_pernet_subsys:
 	destroy_workqueue(tc_filter_wq);
 	return err;