net: airoha: Add airoha_ppe_dev struct definition

Introduce airoha_ppe_dev struct as container for PPE offload callbacks
consumed by the MT76 driver during flowtable offload for traffic
received by the wlan NIC and forwarded to the wired one.
Add airoha_ppe_setup_tc_block_cb routine to PPE offload ops for MT76
driver.
Rely on airoha_ppe_dev pointer in airoha_ppe_setup_tc_block_cb
signature.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20250823-airoha-en7581-wlan-rx-offload-v3-2-f78600ec3ed8@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/airoha/airoha_eth.c

@@ -2599,13 +2599,15 @@ static int airoha_dev_setup_tc_block_cb(enum tc_setup_type type,
 					void *type_data, void *cb_priv)
 {
 	struct net_device *dev = cb_priv;
+	struct airoha_gdm_port *port = netdev_priv(dev);
+	struct airoha_eth *eth = port->qdma->eth;
 
 	if (!tc_can_offload(dev))
 		return -EOPNOTSUPP;
 
 	switch (type) {
 	case TC_SETUP_CLSFLOWER:
-		return airoha_ppe_setup_tc_block_cb(dev, type_data);
+		return airoha_ppe_setup_tc_block_cb(&eth->ppe->dev, type_data);
 	case TC_SETUP_CLSMATCHALL:
 		return airoha_dev_tc_matchall(dev, type_data);
 	default:

drivers/net/ethernet/airoha/airoha_eth.h

@@ -13,6 +13,7 @@
 #include <linux/kernel.h>
 #include <linux/netdevice.h>
 #include <linux/reset.h>
+#include <linux/soc/airoha/airoha_offload.h>
 #include <net/dsa.h>
 
 #define AIROHA_MAX_NUM_GDM_PORTS	4
@@ -546,6 +547,7 @@ struct airoha_gdm_port {
 #define AIROHA_RXD4_FOE_ENTRY		GENMASK(15, 0)
 
 struct airoha_ppe {
+	struct airoha_ppe_dev dev;
 	struct airoha_eth *eth;
 
 	void *foe;
@@ -622,7 +624,7 @@ bool airoha_is_valid_gdm_port(struct airoha_eth *eth,
 
 void airoha_ppe_check_skb(struct airoha_ppe *ppe, struct sk_buff *skb,
 			  u16 hash);
-int airoha_ppe_setup_tc_block_cb(struct net_device *dev, void *type_data);
+int airoha_ppe_setup_tc_block_cb(struct airoha_ppe_dev *dev, void *type_data);
 int airoha_ppe_init(struct airoha_eth *eth);
 void airoha_ppe_deinit(struct airoha_eth *eth);
 void airoha_ppe_init_upd_mem(struct airoha_gdm_port *port);

drivers/net/ethernet/airoha/airoha_npu.c

@@ -11,7 +11,6 @@
 #include <linux/of_platform.h>
 #include <linux/of_reserved_mem.h>
 #include <linux/regmap.h>
-#include <linux/soc/airoha/airoha_offload.h>
 
 #include "airoha_eth.h"
 

drivers/net/ethernet/airoha/airoha_ppe.c

@@ -6,8 +6,9 @@
 
 #include <linux/ip.h>
 #include <linux/ipv6.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
 #include <linux/rhashtable.h>
-#include <linux/soc/airoha/airoha_offload.h>
 #include <net/ipv6.h>
 #include <net/pkt_cls.h>
 
@@ -1282,10 +1283,10 @@ error_npu_put:
 	return err;
 }
 
-int airoha_ppe_setup_tc_block_cb(struct net_device *dev, void *type_data)
+int airoha_ppe_setup_tc_block_cb(struct airoha_ppe_dev *dev, void *type_data)
 {
-	struct airoha_gdm_port *port = netdev_priv(dev);
-	struct airoha_eth *eth = port->qdma->eth;
+	struct airoha_ppe *ppe = dev->priv;
+	struct airoha_eth *eth = ppe->eth;
 	int err = 0;
 
 	mutex_lock(&flow_offload_mutex);
@@ -1338,6 +1339,61 @@ void airoha_ppe_init_upd_mem(struct airoha_gdm_port *port)
 		     PPE_UPDMEM_WR_MASK | PPE_UPDMEM_REQ_MASK);
 }
 
+struct airoha_ppe_dev *airoha_ppe_get_dev(struct device *dev)
+{
+	struct platform_device *pdev;
+	struct device_node *np;
+	struct airoha_eth *eth;
+
+	np = of_parse_phandle(dev->of_node, "airoha,eth", 0);
+	if (!np)
+		return ERR_PTR(-ENODEV);
+
+	pdev = of_find_device_by_node(np);
+	if (!pdev) {
+		dev_err(dev, "cannot find device node %s\n", np->name);
+		of_node_put(np);
+		return ERR_PTR(-ENODEV);
+	}
+	of_node_put(np);
+
+	if (!try_module_get(THIS_MODULE)) {
+		dev_err(dev, "failed to get the device driver module\n");
+		goto error_pdev_put;
+	}
+
+	eth = platform_get_drvdata(pdev);
+	if (!eth)
+		goto error_module_put;
+
+	if (!device_link_add(dev, &pdev->dev, DL_FLAG_AUTOREMOVE_SUPPLIER)) {
+		dev_err(&pdev->dev,
+			"failed to create device link to consumer %s\n",
+			dev_name(dev));
+		goto error_module_put;
+	}
+
+	return &eth->ppe->dev;
+
+error_module_put:
+	module_put(THIS_MODULE);
+error_pdev_put:
+	platform_device_put(pdev);
+
+	return ERR_PTR(-ENODEV);
+}
+EXPORT_SYMBOL_GPL(airoha_ppe_get_dev);
+
+void airoha_ppe_put_dev(struct airoha_ppe_dev *dev)
+{
+	struct airoha_ppe *ppe = dev->priv;
+	struct airoha_eth *eth = ppe->eth;
+
+	module_put(THIS_MODULE);
+	put_device(eth->dev);
+}
+EXPORT_SYMBOL_GPL(airoha_ppe_put_dev);
+
 int airoha_ppe_init(struct airoha_eth *eth)
 {
 	struct airoha_ppe *ppe;
@@ -1347,6 +1403,9 @@ int airoha_ppe_init(struct airoha_eth *eth)
 	if (!ppe)
 		return -ENOMEM;
 
+	ppe->dev.ops.setup_tc_block_cb = airoha_ppe_setup_tc_block_cb;
+	ppe->dev.priv = ppe;
+
 	foe_size = PPE_NUM_ENTRIES * sizeof(struct airoha_foe_entry);
 	ppe->foe = dmam_alloc_coherent(eth->dev, foe_size, &ppe->foe_dma,
 				       GFP_KERNEL);

include/linux/soc/airoha/airoha_offload.h

@@ -9,6 +9,41 @@
 #include <linux/spinlock.h>
 #include <linux/workqueue.h>
 
+struct airoha_ppe_dev {
+	struct {
+		int (*setup_tc_block_cb)(struct airoha_ppe_dev *dev,
+					 void *type_data);
+	} ops;
+
+	void *priv;
+};
+
+#if (IS_BUILTIN(CONFIG_NET_AIROHA) || IS_MODULE(CONFIG_NET_AIROHA))
+struct airoha_ppe_dev *airoha_ppe_get_dev(struct device *dev);
+void airoha_ppe_put_dev(struct airoha_ppe_dev *dev);
+
+static inline int airoha_ppe_dev_setup_tc_block_cb(struct airoha_ppe_dev *dev,
+						   void *type_data)
+{
+	return dev->ops.setup_tc_block_cb(dev, type_data);
+}
+#else
+static inline struct airoha_ppe_dev *airoha_ppe_get_dev(struct device *dev)
+{
+	return NULL;
+}
+
+static inline void airoha_ppe_put_dev(struct airoha_ppe_dev *dev)
+{
+}
+
+static inline int airoha_ppe_setup_tc_block_cb(struct airoha_ppe_dev *dev,
+					       void *type_data)
+{
+	return -EOPNOTSUPP;
+}
+#endif
+
 #define NPU_NUM_CORES		8
 #define NPU_NUM_IRQ		6
 #define NPU_RX0_DESC_NUM	512