net: sparx5: add bookkeeping code for matchall rules

In preparation for new tc matchall rules, we add a bit of bookkeeping
code to keep track of them. The rules are identified by the cookie
passed from the tc stack.

Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Reviewed-by: Steen Hegelund <Steen.Hegelund@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Danielmachon

drivers/net/ethernet/microchip/sparx5/sparx5_main.c

@@ -899,6 +899,9 @@ static int mchp_sparx5_probe(struct platform_device *pdev)
 		dev_err(sparx5->dev, "PTP failed\n");
 		goto cleanup_ports;
 	}
+
+	INIT_LIST_HEAD(&sparx5->mall_entries);
+
 	goto cleanup_config;
 
 cleanup_ports:

drivers/net/ethernet/microchip/sparx5/sparx5_main.h

@@ -18,6 +18,7 @@
 #include <linux/ptp_clock_kernel.h>
 #include <linux/hrtimer.h>
 #include <linux/debugfs.h>
+#include <net/flow_offload.h>
 
 #include "sparx5_main_regs.h"
 
@@ -227,6 +228,14 @@ struct sparx5_mdb_entry {
 	u16 pgid_idx;
 };
 
+struct sparx5_mall_entry {
+	struct list_head list;
+	struct sparx5_port *port;
+	unsigned long cookie;
+	enum flow_action_id type;
+	bool ingress;
+};
+
 #define SPARX5_PTP_TIMEOUT		msecs_to_jiffies(10)
 #define SPARX5_SKB_CB(skb) \
 	((struct sparx5_skb_cb *)((skb)->cb))
@@ -295,6 +304,7 @@ struct sparx5 {
 	struct vcap_control *vcap_ctrl;
 	/* PGID allocation map */
 	u8 pgid_map[PGID_TABLE_SIZE];
+	struct list_head mall_entries;
 	/* Common root for debugfs */
 	struct dentry *debugfs_root;
 };

drivers/net/ethernet/microchip/sparx5/sparx5_tc_matchall.c

@@ -11,11 +11,37 @@
 #include "sparx5_main.h"
 #include "sparx5_vcap_impl.h"
 
+static struct sparx5_mall_entry *
+sparx5_tc_matchall_entry_find(struct list_head *entries, unsigned long cookie)
+{
+	struct sparx5_mall_entry *entry;
+
+	list_for_each_entry(entry, entries, list) {
+		if (entry->cookie == cookie)
+			return entry;
+	}
+
+	return NULL;
+}
+
+static void sparx5_tc_matchall_parse_action(struct sparx5_port *port,
+					    struct sparx5_mall_entry *entry,
+					    struct flow_action_entry *action,
+					    bool ingress,
+					    unsigned long cookie)
+{
+	entry->port = port;
+	entry->type = action->id;
+	entry->ingress = ingress;
+	entry->cookie = cookie;
+}
+
 static int sparx5_tc_matchall_replace(struct net_device *ndev,
 				      struct tc_cls_matchall_offload *tmo,
 				      bool ingress)
 {
 	struct sparx5_port *port = netdev_priv(ndev);
+	struct sparx5_mall_entry *mall_entry;
 	struct flow_action_entry *action;
 	struct sparx5 *sparx5;
 	int err;
@@ -27,6 +53,16 @@ static int sparx5_tc_matchall_replace(struct net_device *ndev,
 	}
 	action = &tmo->rule->action.entries[0];
 
+	mall_entry = kzalloc(sizeof(*mall_entry), GFP_KERNEL);
+	if (!mall_entry)
+		return -ENOMEM;
+
+	sparx5_tc_matchall_parse_action(port,
+					mall_entry,
+					action,
+					ingress,
+					tmo->cookie);
+
 	sparx5 = port->sparx5;
 	switch (action->id) {
 	case FLOW_ACTION_GOTO:
@@ -59,6 +95,9 @@ static int sparx5_tc_matchall_replace(struct net_device *ndev,
 		NL_SET_ERR_MSG_MOD(tmo->common.extack, "Unsupported action");
 		return -EOPNOTSUPP;
 	}
+
+	list_add_tail(&mall_entry->list, &sparx5->mall_entries);
+
 	return 0;
 }
 
@@ -67,19 +106,26 @@ static int sparx5_tc_matchall_destroy(struct net_device *ndev,
 				      bool ingress)
 {
 	struct sparx5_port *port = netdev_priv(ndev);
-	struct sparx5 *sparx5;
+	struct sparx5 *sparx5 = port->sparx5;
+	struct sparx5_mall_entry *entry;
 	int err;
 
-	sparx5 = port->sparx5;
-	if (!tmo->rule && tmo->cookie) {
+	entry = sparx5_tc_matchall_entry_find(&sparx5->mall_entries,
+					      tmo->cookie);
+	if (!entry)
+		return -ENOENT;
+
+	if (entry->type == FLOW_ACTION_GOTO) {
 		err = vcap_enable_lookups(sparx5->vcap_ctrl, ndev,
 					  0, 0, tmo->cookie, false);
-		if (err)
-			return err;
-		return 0;
+	} else {
+		NL_SET_ERR_MSG_MOD(tmo->common.extack, "Unsupported action");
+		err = -EOPNOTSUPP;
 	}
-	NL_SET_ERR_MSG_MOD(tmo->common.extack, "Unsupported action");
-	return -EOPNOTSUPP;
+
+	list_del(&entry->list);
+
+	return err;
 }
 
 int sparx5_tc_matchall(struct net_device *ndev,