tsnep: Add TSN endpoint Ethernet MAC driver

The TSN endpoint Ethernet MAC is a FPGA based network device for
real-time communication.

It is integrated as Ethernet controller with ethtool and PTP support.
For real-time communcation TC_SETUP_QDISC_TAPRIO is supported.

Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/Kconfig

@@ -73,6 +73,7 @@ config DNET
 source "drivers/net/ethernet/dec/Kconfig"
 source "drivers/net/ethernet/dlink/Kconfig"
 source "drivers/net/ethernet/emulex/Kconfig"
+source "drivers/net/ethernet/engleder/Kconfig"
 source "drivers/net/ethernet/ezchip/Kconfig"
 source "drivers/net/ethernet/faraday/Kconfig"
 source "drivers/net/ethernet/freescale/Kconfig"

drivers/net/ethernet/Makefile

@@ -36,6 +36,7 @@ obj-$(CONFIG_DNET) += dnet.o
 obj-$(CONFIG_NET_VENDOR_DEC) += dec/
 obj-$(CONFIG_NET_VENDOR_DLINK) += dlink/
 obj-$(CONFIG_NET_VENDOR_EMULEX) += emulex/
+obj-$(CONFIG_NET_VENDOR_ENGLEDER) += engleder/
 obj-$(CONFIG_NET_VENDOR_EZCHIP) += ezchip/
 obj-$(CONFIG_NET_VENDOR_FARADAY) += faraday/
 obj-$(CONFIG_NET_VENDOR_FREESCALE) += freescale/

drivers/net/ethernet/engleder/Kconfig

@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Engleder network device configuration
+#
+
+config NET_VENDOR_ENGLEDER
+	bool "Engleder devices"
+	default y
+	help
+	  If you have a network (Ethernet) card belonging to this class, say Y.
+
+	  Note that the answer to this question doesn't directly affect the
+	  kernel: saying N will just cause the configurator to skip all
+	  the questions about Engleder devices. If you say Y, you will be asked
+	  for your specific card in the following questions.
+
+if NET_VENDOR_ENGLEDER
+
+config TSNEP
+	tristate "TSN endpoint support"
+	depends on PTP_1588_CLOCK_OPTIONAL
+	select PHYLIB
+	help
+	  Support for the Engleder TSN endpoint Ethernet MAC IP Core.
+
+	  To compile this driver as a module, choose M here. The module will be
+	  called tsnep.
+
+config TSNEP_SELFTESTS
+	bool "TSN endpoint self test support"
+	default n
+	depends on TSNEP
+	help
+	  This enables self test support within the TSN endpoint driver.
+
+	  If unsure, say N.
+
+endif # NET_VENDOR_ENGLEDER

drivers/net/ethernet/engleder/Makefile

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the Engleder Ethernet drivers
+#
+
+obj-$(CONFIG_TSNEP) += tsnep.o
+
+tsnep-objs := tsnep_main.o tsnep_ethtool.o tsnep_ptp.o tsnep_tc.o \
+	      $(tsnep-y)
+tsnep-$(CONFIG_TSNEP_SELFTESTS) += tsnep_selftests.o

drivers/net/ethernet/engleder/tsnep.h

@@ -0,0 +1,190 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */
+
+#ifndef _TSNEP_H
+#define _TSNEP_H
+
+#include "tsnep_hw.h"
+
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/etherdevice.h>
+#include <linux/phy.h>
+#include <linux/ethtool.h>
+#include <linux/net_tstamp.h>
+#include <linux/ptp_clock_kernel.h>
+#include <linux/miscdevice.h>
+
+#define TSNEP "tsnep"
+
+#define TSNEP_RING_SIZE 256
+#define TSNEP_RING_ENTRIES_PER_PAGE (PAGE_SIZE / TSNEP_DESC_SIZE)
+#define TSNEP_RING_PAGE_COUNT (TSNEP_RING_SIZE / TSNEP_RING_ENTRIES_PER_PAGE)
+
+#define TSNEP_QUEUES 1
+
+struct tsnep_gcl {
+	void __iomem *addr;
+
+	u64 base_time;
+	u64 cycle_time;
+	u64 cycle_time_extension;
+
+	struct tsnep_gcl_operation operation[TSNEP_GCL_COUNT];
+	int count;
+
+	u64 change_limit;
+
+	u64 start_time;
+	bool change;
+};
+
+struct tsnep_tx_entry {
+	struct tsnep_tx_desc *desc;
+	struct tsnep_tx_desc_wb *desc_wb;
+	dma_addr_t desc_dma;
+	bool owner_user_flag;
+
+	u32 properties;
+
+	struct sk_buff *skb;
+	size_t len;
+	DEFINE_DMA_UNMAP_ADDR(dma);
+};
+
+struct tsnep_tx {
+	struct tsnep_adapter *adapter;
+	void __iomem *addr;
+
+	void *page[TSNEP_RING_PAGE_COUNT];
+	dma_addr_t page_dma[TSNEP_RING_PAGE_COUNT];
+
+	/* TX ring lock */
+	spinlock_t lock;
+	struct tsnep_tx_entry entry[TSNEP_RING_SIZE];
+	int write;
+	int read;
+	u32 owner_counter;
+	int increment_owner_counter;
+
+	u32 packets;
+	u32 bytes;
+	u32 dropped;
+};
+
+struct tsnep_rx_entry {
+	struct tsnep_rx_desc *desc;
+	struct tsnep_rx_desc_wb *desc_wb;
+	dma_addr_t desc_dma;
+
+	u32 properties;
+
+	struct sk_buff *skb;
+	size_t len;
+	DEFINE_DMA_UNMAP_ADDR(dma);
+};
+
+struct tsnep_rx {
+	struct tsnep_adapter *adapter;
+	void __iomem *addr;
+
+	void *page[TSNEP_RING_PAGE_COUNT];
+	dma_addr_t page_dma[TSNEP_RING_PAGE_COUNT];
+
+	struct tsnep_rx_entry entry[TSNEP_RING_SIZE];
+	int read;
+	u32 owner_counter;
+	int increment_owner_counter;
+
+	u32 packets;
+	u32 bytes;
+	u32 dropped;
+	u32 multicast;
+};
+
+struct tsnep_queue {
+	struct tsnep_adapter *adapter;
+
+	struct tsnep_tx *tx;
+	struct tsnep_rx *rx;
+
+	struct napi_struct napi;
+
+	u32 irq_mask;
+};
+
+struct tsnep_adapter {
+	struct net_device *netdev;
+	u8 mac_address[ETH_ALEN];
+	struct mii_bus *mdiobus;
+	bool suppress_preamble;
+	phy_interface_t phy_mode;
+	struct phy_device *phydev;
+	int msg_enable;
+
+	struct platform_device *pdev;
+	struct device *dmadev;
+	void __iomem *addr;
+	unsigned long size;
+	int irq;
+
+	bool gate_control;
+	/* gate control lock */
+	struct mutex gate_control_lock;
+	bool gate_control_active;
+	struct tsnep_gcl gcl[2];
+	int next_gcl;
+
+	struct hwtstamp_config hwtstamp_config;
+	struct ptp_clock *ptp_clock;
+	struct ptp_clock_info ptp_clock_info;
+	/* ptp clock lock */
+	spinlock_t ptp_lock;
+
+	int num_tx_queues;
+	struct tsnep_tx tx[TSNEP_MAX_QUEUES];
+	int num_rx_queues;
+	struct tsnep_rx rx[TSNEP_MAX_QUEUES];
+
+	int num_queues;
+	struct tsnep_queue queue[TSNEP_MAX_QUEUES];
+};
+
+extern const struct ethtool_ops tsnep_ethtool_ops;
+
+int tsnep_ptp_init(struct tsnep_adapter *adapter);
+void tsnep_ptp_cleanup(struct tsnep_adapter *adapter);
+int tsnep_ptp_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd);
+
+int tsnep_tc_init(struct tsnep_adapter *adapter);
+void tsnep_tc_cleanup(struct tsnep_adapter *adapter);
+int tsnep_tc_setup(struct net_device *netdev, enum tc_setup_type type,
+		   void *type_data);
+
+#if IS_ENABLED(CONFIG_TSNEP_SELFTESTS)
+int tsnep_ethtool_get_test_count(void);
+void tsnep_ethtool_get_test_strings(u8 *data);
+void tsnep_ethtool_self_test(struct net_device *netdev,
+			     struct ethtool_test *eth_test, u64 *data);
+#else
+static inline int tsnep_ethtool_get_test_count(void)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline void tsnep_ethtool_get_test_strings(u8 *data)
+{
+	/* not enabled */
+}
+
+static inline void tsnep_ethtool_self_test(struct net_device *dev,
+					   struct ethtool_test *eth_test,
+					   u64 *data)
+{
+	/* not enabled */
+}
+#endif /* CONFIG_TSNEP_SELFTESTS */
+
+void tsnep_get_system_time(struct tsnep_adapter *adapter, u64 *time);
+
+#endif /* _TSNEP_H */