net: prestera: acl: extract matchall logic into a separate file

This commit adds more clarity to handling of TC_CLSMATCHALL_REPLACE and
TC_CLSMATCHALL_DESTROY events by calling newly added *_mall_*() handlers
instead of directly calling SPAN API.

This also extracts matchall rules management out of SPAN API since SPAN
is a hardware module which is used to implement 'matchall egress mirred'
action only.

Signed-off-by: Taras Chornyi <tchornyi@marvell.com>
Signed-off-by: Serhiy Boiko <serhiy.boiko@plvision.eu>
Signed-off-by: Maksym Glubokiy <maksym.glubokiy@plvision.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/prestera/Makefile

@@ -4,6 +4,6 @@ prestera-objs		:= prestera_main.o prestera_hw.o prestera_dsa.o \
 			   prestera_rxtx.o prestera_devlink.o prestera_ethtool.o \
 			   prestera_switchdev.o prestera_acl.o prestera_flow.o \
 			   prestera_flower.o prestera_span.o prestera_counter.o \
-			   prestera_router.o prestera_router_hw.o
+			   prestera_router.o prestera_router_hw.o prestera_matchall.o
 
 obj-$(CONFIG_PRESTERA_PCI)	+= prestera_pci.o

drivers/net/ethernet/marvell/prestera/prestera_flow.c

@@ -7,8 +7,9 @@
 #include "prestera.h"
 #include "prestera_acl.h"
 #include "prestera_flow.h"
-#include "prestera_span.h"
 #include "prestera_flower.h"
+#include "prestera_matchall.h"
+#include "prestera_span.h"
 
 static LIST_HEAD(prestera_block_cb_list);
 
@@ -17,9 +18,9 @@ static int prestera_flow_block_mall_cb(struct prestera_flow_block *block,
 {
 	switch (f->command) {
 	case TC_CLSMATCHALL_REPLACE:
-		return prestera_span_replace(block, f);
+		return prestera_mall_replace(block, f);
 	case TC_CLSMATCHALL_DESTROY:
-		prestera_span_destroy(block);
+		prestera_mall_destroy(block);
 		return 0;
 	default:
 		return -EOPNOTSUPP;
@@ -263,7 +264,7 @@ static void prestera_setup_flow_block_unbind(struct prestera_port *port,
 
 	block = flow_block_cb_priv(block_cb);
 
-	prestera_span_destroy(block);
+	prestera_mall_destroy(block);
 
 	err = prestera_flow_block_unbind(block, port);
 	if (err)

drivers/net/ethernet/marvell/prestera/prestera_matchall.c

@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/* Copyright (c) 2019-2022 Marvell International Ltd. All rights reserved */
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+
+#include "prestera.h"
+#include "prestera_hw.h"
+#include "prestera_flow.h"
+#include "prestera_flower.h"
+#include "prestera_matchall.h"
+#include "prestera_span.h"
+
+int prestera_mall_replace(struct prestera_flow_block *block,
+			  struct tc_cls_matchall_offload *f)
+{
+	struct prestera_flow_block_binding *binding;
+	__be16 protocol = f->common.protocol;
+	struct flow_action_entry *act;
+	struct prestera_port *port;
+	int err;
+
+	if (!flow_offload_has_one_action(&f->rule->action)) {
+		NL_SET_ERR_MSG(f->common.extack,
+			       "Only singular actions are supported");
+		return -EOPNOTSUPP;
+	}
+
+	act = &f->rule->action.entries[0];
+
+	if (!prestera_netdev_check(act->dev)) {
+		NL_SET_ERR_MSG(f->common.extack,
+			       "Only Marvell Prestera port is supported");
+		return -EINVAL;
+	}
+	if (!tc_cls_can_offload_and_chain0(act->dev, &f->common))
+		return -EOPNOTSUPP;
+	if (act->id != FLOW_ACTION_MIRRED)
+		return -EOPNOTSUPP;
+	if (protocol != htons(ETH_P_ALL))
+		return -EOPNOTSUPP;
+
+	port = netdev_priv(act->dev);
+
+	list_for_each_entry(binding, &block->binding_list, list) {
+		err = prestera_span_rule_add(binding, port);
+		if (err)
+			goto rollback;
+	}
+
+	return 0;
+
+rollback:
+	list_for_each_entry_continue_reverse(binding,
+					     &block->binding_list, list)
+		prestera_span_rule_del(binding);
+	return err;
+}
+
+void prestera_mall_destroy(struct prestera_flow_block *block)
+{
+	struct prestera_flow_block_binding *binding;
+
+	list_for_each_entry(binding, &block->binding_list, list)
+		prestera_span_rule_del(binding);
+}

drivers/net/ethernet/marvell/prestera/prestera_matchall.h

@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
+/* Copyright (c) 2022 Marvell International Ltd. All rights reserved. */
+
+#ifndef _PRESTERA_MATCHALL_H_
+#define _PRESTERA_MATCHALL_H_
+
+#include <net/pkt_cls.h>
+
+struct prestera_flow_block;
+
+int prestera_mall_replace(struct prestera_flow_block *block,
+			  struct tc_cls_matchall_offload *f);
+void prestera_mall_destroy(struct prestera_flow_block *block);
+
+#endif /* _PRESTERA_MATCHALL_H_ */

drivers/net/ethernet/marvell/prestera/prestera_span.c

@@ -120,8 +120,8 @@ static int prestera_span_put(struct prestera_switch *sw, u8 span_id)
 	return 0;
 }
 
-static int prestera_span_rule_add(struct prestera_flow_block_binding *binding,
+int prestera_span_rule_add(struct prestera_flow_block_binding *binding,
-				  struct prestera_port *to_port)
+			   struct prestera_port *to_port)
 {
 	struct prestera_switch *sw = binding->port->sw;
 	u8 span_id;
@@ -145,7 +145,7 @@ static int prestera_span_rule_add(struct prestera_flow_block_binding *binding,
 	return 0;
 }
 
-static int prestera_span_rule_del(struct prestera_flow_block_binding *binding)
+int prestera_span_rule_del(struct prestera_flow_block_binding *binding)
 {
 	int err;
 
@@ -161,60 +161,6 @@ static int prestera_span_rule_del(struct prestera_flow_block_binding *binding)
 	return 0;
 }
 
-int prestera_span_replace(struct prestera_flow_block *block,
-			  struct tc_cls_matchall_offload *f)
-{
-	struct prestera_flow_block_binding *binding;
-	__be16 protocol = f->common.protocol;
-	struct flow_action_entry *act;
-	struct prestera_port *port;
-	int err;
-
-	if (!flow_offload_has_one_action(&f->rule->action)) {
-		NL_SET_ERR_MSG(f->common.extack,
-			       "Only singular actions are supported");
-		return -EOPNOTSUPP;
-	}
-
-	act = &f->rule->action.entries[0];
-
-	if (!prestera_netdev_check(act->dev)) {
-		NL_SET_ERR_MSG(f->common.extack,
-			       "Only Marvell Prestera port is supported");
-		return -EINVAL;
-	}
-	if (!tc_cls_can_offload_and_chain0(act->dev, &f->common))
-		return -EOPNOTSUPP;
-	if (act->id != FLOW_ACTION_MIRRED)
-		return -EOPNOTSUPP;
-	if (protocol != htons(ETH_P_ALL))
-		return -EOPNOTSUPP;
-
-	port = netdev_priv(act->dev);
-
-	list_for_each_entry(binding, &block->binding_list, list) {
-		err = prestera_span_rule_add(binding, port);
-		if (err)
-			goto rollback;
-	}
-
-	return 0;
-
-rollback:
-	list_for_each_entry_continue_reverse(binding,
-					     &block->binding_list, list)
-		prestera_span_rule_del(binding);
-	return err;
-}
-
-void prestera_span_destroy(struct prestera_flow_block *block)
-{
-	struct prestera_flow_block_binding *binding;
-
-	list_for_each_entry(binding, &block->binding_list, list)
-		prestera_span_rule_del(binding);
-}
-
 int prestera_span_init(struct prestera_switch *sw)
 {
 	struct prestera_span *span;

drivers/net/ethernet/marvell/prestera/prestera_span.h

@@ -8,13 +8,15 @@
 
 #define PRESTERA_SPAN_INVALID_ID -1
 
+struct prestera_port;
 struct prestera_switch;
-struct prestera_flow_block;
+struct prestera_flow_block_binding;
 
 int prestera_span_init(struct prestera_switch *sw);
 void prestera_span_fini(struct prestera_switch *sw);
-int prestera_span_replace(struct prestera_flow_block *block,
+
-			  struct tc_cls_matchall_offload *f);
+int prestera_span_rule_add(struct prestera_flow_block_binding *binding,
-void prestera_span_destroy(struct prestera_flow_block *block);
+			   struct prestera_port *to_port);
+int prestera_span_rule_del(struct prestera_flow_block_binding *binding);
 
 #endif /* _PRESTERA_SPAN_H_ */