[PATCH net-next 13/20] net: ethernet: qualcomm: Export PPE function set_maxframe

[Luo Jie]

set_maxframe is called when the MTU of interface is configured, which
limits the size of packet passed through PPE.

Signed-off-by: Luo Jie <quic_luoj at quicinc.com>
---
 drivers/net/ethernet/qualcomm/ppe/ppe.c | 41 +++++++++++++++++++++++++
 include/linux/soc/qcom/ppe.h            | 12 ++++++++
 2 files changed, 53 insertions(+)

diff --git a/drivers/net/ethernet/qualcomm/ppe/ppe.c b/drivers/net/ethernet/qualcomm/ppe/ppe.c
index 746ef42fea5d..d0e0fa9d5609 100644
--- a/drivers/net/ethernet/qualcomm/ppe/ppe.c
+++ b/drivers/net/ethernet/qualcomm/ppe/ppe.c
@@ -12,6 +12,7 @@
 #include <linux/of.h>
 #include <linux/regmap.h>
 #include <linux/platform_device.h>
+#include <linux/if_ether.h>
 #include <linux/soc/qcom/ppe.h>
 #include "ppe.h"
 #include "ppe_regs.h"
@@ -293,6 +294,45 @@ struct ppe_device *ppe_dev_get(struct platform_device *pdev)
 }
 EXPORT_SYMBOL_GPL(ppe_dev_get);
 
+struct ppe_device_ops *ppe_ops_get(struct platform_device *pdev)
+{
+	struct ppe_device *ppe_dev = platform_get_drvdata(pdev);
+
+	if (!ppe_dev)
+		return NULL;
+
+	return ppe_dev->ppe_ops;
+}
+EXPORT_SYMBOL_GPL(ppe_ops_get);
+
+static int ppe_port_maxframe_set(struct ppe_device *ppe_dev,
+				 int port, int maxframe_size)
+{
+	union ppe_mru_mtu_ctrl_cfg_u mru_mtu_cfg;
+
+	/* The max frame size should be MTU added by ETH_HLEN in PPE */
+	maxframe_size += ETH_HLEN;
+
+	if (port < PPE_MC_MTU_CTRL_TBL_NUM)
+		ppe_mask(ppe_dev, PPE_MC_MTU_CTRL_TBL + PPE_MC_MTU_CTRL_TBL_INC * port,
+			 PPE_MC_MTU_CTRL_TBL_MTU,
+			 FIELD_PREP(PPE_MC_MTU_CTRL_TBL_MTU, maxframe_size));
+
+	memset(&mru_mtu_cfg, 0, sizeof(mru_mtu_cfg));
+	ppe_read_tbl(ppe_dev, PPE_MRU_MTU_CTRL_TBL + PPE_MRU_MTU_CTRL_TBL_INC * port,
+		     mru_mtu_cfg.val, sizeof(mru_mtu_cfg.val));
+
+	mru_mtu_cfg.bf.mru = maxframe_size;
+	mru_mtu_cfg.bf.mtu = maxframe_size;
+
+	return ppe_write_tbl(ppe_dev, PPE_MRU_MTU_CTRL_TBL + PPE_MRU_MTU_CTRL_TBL_INC * port,
+			     mru_mtu_cfg.val, sizeof(mru_mtu_cfg.val));
+}
+
+static struct ppe_device_ops qcom_ppe_ops = {
+	.set_maxframe = ppe_port_maxframe_set,
+};
+
 static const struct regmap_range ppe_readable_ranges[] = {
 	regmap_reg_range(0x0, 0x1FF), /* GLB */
 	regmap_reg_range(0x400, 0x5FF), /* LPI CSR */
@@ -1286,6 +1326,7 @@ static int qcom_ppe_probe(struct platform_device *pdev)
 				     ret,
 				     "ppe device hw init failed\n");
 
+	ppe_dev->ppe_ops = &qcom_ppe_ops;
 	ppe_dev->is_ppe_probed = true;
 	return 0;
 }
diff --git a/include/linux/soc/qcom/ppe.h b/include/linux/soc/qcom/ppe.h
index 90566a8841b4..70ee192d9ef0 100644
--- a/include/linux/soc/qcom/ppe.h
+++ b/include/linux/soc/qcom/ppe.h
@@ -16,13 +16,25 @@
 struct ppe_device {
 	struct device *dev;
 	struct regmap *regmap;
+	struct ppe_device_ops *ppe_ops;
 	bool is_ppe_probed;
 	void *ppe_priv;
 };
 
+/* PPE operations, which is used by the external driver like Ethernet
+ * DMA driver to configure PPE.
+ */
+struct ppe_device_ops {
+	int	(*set_maxframe)(struct ppe_device *ppe_dev, int port,
+				int maxframe_size);
+};
+
 /* Function used to check PPE platform dirver is registered correctly or not. */
 bool ppe_is_probed(struct platform_device *pdev);
 
 /* Function used to get the PPE device */
 struct ppe_device *ppe_dev_get(struct platform_device *pdev);
+
+/* Function used to get the operations of PPE device */
+struct ppe_device_ops *ppe_ops_get(struct platform_device *pdev);
 #endif
-- 
2.42.0