[PATCH net-next v14 00/13] Add Realtek automotive PCIe driver

[PATCH net-next v14 00/13] Add Realtek automotive PCIe driver

[Justin Lai]

This series includes adding realtek automotive ethernet driver 
and adding rtase ethernet driver entry in MAINTAINERS file.

This ethernet device driver for the PCIe interface of 
Realtek Automotive Ethernet Switch,applicable to 
RTL9054, RTL9068, RTL9072, RTL9075, RTL9068, RTL9071.

v1 -> v2:
- Remove redundent debug message.
- Modify coding rule.
- Remove other function codes not related to netdev.

v2 -> v3:
- Remove SR-IOV function - We will add the SR-IOV function together when
uploading the vf driver in the future.
- Remove other unnecessary code and macro.

v3 -> v4:
- Remove function prototype - Our driver does not use recursion, so we
have reordered the code and removed the function prototypes.
- Define macro precisely - Improve macro code readability to make the
source code cleaner.

v4 -> v5:
- Modify ethtool function - Remove some unnecessary code.
- Don't use inline function - Let the compiler decide.

v5 -> v6:
- Some old macro definitions have been removed and replaced with the
lastest usage.
- Replace s32 with int to ensure consistency.
- Clearly point out the objects of the service and remove unnecessary
struct.

v6 -> v7:
- Split this driver into multiple patches.
- Reorganize this driver code and remove redundant code to make this
driver more concise.

v7 -> v8:
- Add the function to calculate time mitigation and the function to 
calculate packet number mitigation. Users can use these two functions 
to calculate the reg value that needs to be set for the mitigation value
they want to set.
- This device is usually used in automotive embedded systems. The page
pool api will use more memory in receiving packets and requires more 
verification, so we currently do not plan to use it in this patch.

v8 -> v9:
- Declare functions that are not extern as static functions and increase
the size of the character array named name in the rtase_int_vector struct
to correct the build warning noticed by the kernel test robot.

v9 -> v10:
- Currently we change to use the page pool api. However, when we allocate
more than one page to an rx buffer, it will cause system errors
in some cases. Therefore, we set the rx buffer to fixed size with 3776
(PAGE_SIZE - SKB_DATA_ALIGN(sizeof(skb_shared_info) )), and the maximum 
value of mtu is set to 3754(rx buffer size - VLAN_ETH_HLEN - ETH_FCS_LEN).
- When ndo_tx_timeout is called, it will dump some device information,
which can be used for debugging.
- When the mtu is greater than 1500, the device supports checksums
but not TSO.
- Fix compiler warnning.

v10 -> v11:
- Added error handling of rtase_init_ring().
- Modify the error related to asymmetric pause in rtase_get_settings.
- Fix compiler error.

v11 -> v12:
- Use pm_sleep_ptr and related macros.
- Remove multicast filter limit.
- Remove VLAN support and CBS offload functions. 
- Remove redundent code.
- Fix compiler warnning.

v12 -> v13:
- Fixed the compiler warning of unuse rtase_suspend() and rtase_resume()
when there is no define CONFIG_PM_SLEEP.

v13 -> v14:
- Remove unuse include.
- call eth_hw_addr_random() to generate random MAC and set device flag 
- use pci_enable_msix_exact() instead of pci_enable_msix_range() 
- If dev->dma_mask is non-NULL, dma_set_mask_and_coherent with a 64-bit
mask will never fail, so remove the part that determines the 32-bit mask.
- set dev->pcpu_stat_type before register_netdev() and core will allocate
stats 
- call NAPI instance at the right location

Justin Lai (13):
  rtase: Add pci table supported in this module
  rtase: Implement the .ndo_open function
  rtase: Implement the rtase_down function
  rtase: Implement the interrupt routine and rtase_poll
  rtase: Implement hardware configuration function
  rtase: Implement .ndo_start_xmit function
  rtase: Implement a function to receive packets
  rtase: Implement net_device_ops
  rtase: Implement pci_driver suspend and resume function
  rtase: Implement ethtool function
  rtase: Add a Makefile in the rtase folder
  realtek: Update the Makefile and Kconfig in the realtek folder
  MAINTAINERS: Add the rtase ethernet driver entry

 MAINTAINERS                                   |    7 +
 drivers/net/ethernet/realtek/Kconfig          |   17 +
 drivers/net/ethernet/realtek/Makefile         |    1 +
 drivers/net/ethernet/realtek/rtase/Makefile   |   10 +
 drivers/net/ethernet/realtek/rtase/rtase.h    |  335 +++
 .../net/ethernet/realtek/rtase/rtase_main.c   | 2372 +++++++++++++++++
 6 files changed, 2742 insertions(+)
 create mode 100644 drivers/net/ethernet/realtek/rtase/Makefile
 create mode 100644 drivers/net/ethernet/realtek/rtase/rtase.h
 create mode 100644 drivers/net/ethernet/realtek/rtase/rtase_main.c

-- 
2.34.1

[PATCH net-next v14 01/13] rtase: Add pci table supported in this module

[Justin Lai]

Add pci table supported in this module, and implement pci_driver function
to initialize this driver, remove this driver, or shutdown this driver.

Signed-off-by: Justin Lai <justinlai0215@realtek.com>
---
 drivers/net/ethernet/realtek/rtase/rtase.h    | 335 ++++++++++
 .../net/ethernet/realtek/rtase/rtase_main.c   | 617 ++++++++++++++++++
 2 files changed, 952 insertions(+)
 create mode 100644 drivers/net/ethernet/realtek/rtase/rtase.h
 create mode 100644 drivers/net/ethernet/realtek/rtase/rtase_main.c

diff --git a/drivers/net/ethernet/realtek/rtase/rtase.h b/drivers/net/ethernet/realtek/rtase/rtase.h
new file mode 100644
index 000000000000..f1671b4d99d5
--- /dev/null
+++ b/drivers/net/ethernet/realtek/rtase/rtase.h
@@ -0,0 +1,335 @@
+/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
+/*
+ *  rtase is the Linux device driver released for Realtek Automotive Switch
+ *  controllers with PCI-Express interface.
+ *
+ *  Copyright(c) 2023 Realtek Semiconductor Corp.
+ */
+
+#ifndef _RTASE_H_
+#define _RTASE_H_
+
+/* the low 32 bit address of receive buffer must be 8-byte alignment. */
+#define RTK_RX_ALIGN 8
+
+#define HW_VER_MASK 0x7C800000
+
+#define RX_DMA_BURST_256       4
+#define TX_DMA_BURST_UNLIMITED 7
+#define RX_BUF_SIZE            (PAGE_SIZE - \
+				SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
+#define MAX_JUMBO_SIZE         (RX_BUF_SIZE - VLAN_ETH_HLEN - ETH_FCS_LEN)
+
+/* 3 means InterFrameGap = the shortest one */
+#define INTERFRAMEGAP 0x03
+
+#define RTASE_REGS_SIZE     256
+#define RTASE_PCI_REGS_SIZE 0x100
+
+#define MULTICAST_FILTER_MASK  GENMASK(30, 26)
+#define MULTICAST_FILTER_LIMIT 32
+
+#define RTASE_VLAN_FILTER_ENTRY_NUM 32
+#define RTASE_NUM_TX_QUEUE 8
+#define RTASE_NUM_RX_QUEUE 4
+
+#define RTASE_TXQ_CTRL      1
+#define RTASE_FUNC_TXQ_NUM  1
+#define RTASE_FUNC_RXQ_NUM  1
+#define RTASE_INTERRUPT_NUM 1
+
+#define MITI_TIME_COUNT_MASK     GENMASK(3, 0)
+#define MITI_TIME_UNIT_MASK      GENMASK(7, 4)
+#define MITI_DEFAULT_TIME        128
+#define MITI_MAX_TIME            491520
+#define MITI_PKT_NUM_COUNT_MASK  GENMASK(11, 8)
+#define MITI_PKT_NUM_UNIT_MASK   GENMASK(13, 12)
+#define MITI_DEFAULT_PKT_NUM     64
+#define MITI_MAX_PKT_NUM_IDX     3
+#define MITI_MAX_PKT_NUM_UNIT    16
+#define MITI_MAX_PKT_NUM         240
+#define MITI_COUNT_BIT_NUM       4
+
+#define RTASE_NUM_MSIX 4
+
+#define RTASE_DWORD_MOD 16
+
+/*****************************************************************************/
+enum rtase_registers {
+	RTASE_MAC0   = 0x0000,
+	RTASE_MAC4   = 0x0004,
+	RTASE_MAR0   = 0x0008,
+	RTASE_MAR1   = 0x000C,
+	RTASE_DTCCR0 = 0x0010,
+	RTASE_DTCCR4 = 0x0014,
+#define COUNTER_RESET BIT(0)
+#define COUNTER_DUMP  BIT(3)
+
+	RTASE_FCR    = 0x0018,
+#define FCR_RXQ_MASK    GENMASK(5, 4)
+#define FCR_VLAN_FTR_EN BIT(1)
+
+	RTASE_LBK_CTRL = 0x001A,
+#define LBK_ATLD BIT(1)
+#define LBK_CLR  BIT(0)
+
+	RTASE_TX_DESC_ADDR0   = 0x0020,
+	RTASE_TX_DESC_ADDR4   = 0x0024,
+	RTASE_TX_DESC_COMMAND = 0x0028,
+#define TX_DESC_CMD_CS BIT(15)
+#define TX_DESC_CMD_WE BIT(14)
+
+	RTASE_BOOT_CTL  = 0x6004,
+	RTASE_CLKSW_SET = 0x6018,
+
+	RTASE_CHIP_CMD = 0x0037,
+#define STOP_REQ      BIT(7)
+#define STOP_REQ_DONE BIT(6)
+#define RE            BIT(3)
+#define TE            BIT(2)
+
+	RTASE_IMR0 = 0x0038,
+	RTASE_ISR0 = 0x003C,
+#define TOK7 BIT(30)
+#define TOK6 BIT(28)
+#define TOK5 BIT(26)
+#define TOK4 BIT(24)
+#define FOVW BIT(6)
+#define RDU  BIT(4)
+#define TOK  BIT(2)
+#define ROK  BIT(0)
+
+	RTASE_IMR1 = 0x0800,
+	RTASE_ISR1 = 0x0802,
+#define Q_TOK BIT(4)
+#define Q_RDU BIT(1)
+#define Q_ROK BIT(0)
+
+	RTASE_EPHY_ISR = 0x6014,
+	RTASE_EPHY_IMR = 0x6016,
+
+	RTASE_TX_CONFIG_0 = 0x0040,
+#define TX_INTER_FRAME_GAP_MASK GENMASK(25, 24)
+	/* DMA burst value (0-7) is shift this many bits */
+#define TX_DMA_MASK             GENMASK(10, 8)
+
+	RTASE_RX_CONFIG_0 = 0x0044,
+#define RX_SINGLE_FETCH  BIT(14)
+#define RX_SINGLE_TAG    BIT(13)
+#define RX_MX_DMA_MASK   GENMASK(10, 8)
+#define ACPT_FLOW        BIT(7)
+#define ACCEPT_ERR       BIT(5)
+#define ACCEPT_RUNT      BIT(4)
+#define ACCEPT_BROADCAST BIT(3)
+#define ACCEPT_MULTICAST BIT(2)
+#define ACCEPT_MYPHYS    BIT(1)
+#define ACCEPT_ALLPHYS   BIT(0)
+#define ACCEPT_MASK      (ACPT_FLOW | ACCEPT_ERR | ACCEPT_RUNT | \
+			  ACCEPT_BROADCAST | ACCEPT_MULTICAST | \
+			  ACCEPT_MYPHYS | ACCEPT_ALLPHYS)
+
+	RTASE_RX_CONFIG_1 = 0x0046,
+#define RX_MAX_FETCH_DESC_MASK  GENMASK(15, 11)
+#define RX_NEW_DESC_FORMAT_EN   BIT(8)
+#define OUTER_VLAN_DETAG_EN     BIT(7)
+#define INNER_VLAN_DETAG_EN     BIT(6)
+#define PCIE_NEW_FLOW           BIT(2)
+#define PCIE_RELOAD_En          BIT(0)
+
+	RTASE_EEM = 0x0050,
+#define EEM_UNLOCK 0xC0
+
+	RTASE_TDFNR  = 0x0057,
+	RTASE_TPPOLL = 0x0090,
+	RTASE_PDR    = 0x00B0,
+	RTASE_FIFOR  = 0x00D3,
+#define TX_FIFO_EMPTY BIT(5)
+#define RX_FIFO_EMPTY BIT(4)
+
+	RTASE_PCPR = 0x00D8,
+#define PCPR_VLAN_FTR_EN BIT(6)
+
+	RTASE_RMS       = 0x00DA,
+	RTASE_CPLUS_CMD = 0x00E0,
+#define FORCE_RXFLOW_EN BIT(11)
+#define FORCE_TXFLOW_EN BIT(10)
+#define RX_CHKSUM       BIT(5)
+
+	RTASE_Q0_RX_DESC_ADDR0 = 0x00E4,
+	RTASE_Q0_RX_DESC_ADDR4 = 0x00E8,
+	RTASE_Q1_RX_DESC_ADDR0 = 0x4000,
+	RTASE_Q1_RX_DESC_ADDR4 = 0x4004,
+	RTASE_MTPS             = 0x00EC,
+#define TAG_NUM_SEL_MASK  GENMASK(10, 8)
+
+	RTASE_MISC = 0x00F2,
+#define RX_DV_GATE_EN BIT(3)
+
+	RTASE_TFUN_CTRL = 0x0400,
+#define TX_NEW_DESC_FORMAT_EN BIT(0)
+
+	RTASE_TX_CONFIG_1 = 0x203E,
+#define TC_MODE_MASK  GENMASK(11, 10)
+
+	RTASE_TOKSEL      = 0x2046,
+	RTASE_RFIFONFULL  = 0x4406,
+	RTASE_INT_MITI_TX = 0x0A00,
+	RTASE_INT_MITI_RX = 0x0A80,
+
+	RTASE_VLAN_ENTRY_MEM_0 = 0x7234,
+	RTASE_VLAN_ENTRY_0     = 0xAC80,
+};
+
+enum desc_status_bit {
+	DESC_OWN = BIT(31), /* Descriptor is owned by NIC */
+	RING_END = BIT(30), /* End of descriptor ring */
+};
+
+enum sw_flag_content {
+	SWF_MSI_ENABLED  = BIT(1),
+	SWF_MSIX_ENABLED = BIT(2),
+};
+
+#define RSVD_MASK 0x3FFFC000
+
+struct tx_desc {
+	__le32 opts1;
+	__le32 opts2;
+	__le64 addr;
+	__le32 opts3;
+	__le32 reserved1;
+	__le32 reserved2;
+	__le32 reserved3;
+} __packed;
+
+/*------ offset 0 of tx descriptor ------*/
+#define TX_FIRST_FRAG BIT(29) /* Tx First segment of a packet */
+#define TX_LAST_FRAG  BIT(28) /* Tx Final segment of a packet */
+#define GIANT_SEND_V4 BIT(26) /* TCP Giant Send Offload V4 (GSOv4) */
+#define GIANT_SEND_V6 BIT(25) /* TCP Giant Send Offload V6 (GSOv6) */
+#define TX_VLAN_TAG   BIT(17) /* Add VLAN tag */
+
+/*------ offset 4 of tx descriptor ------*/
+#define TX_UDPCS_C BIT(31) /* Calculate UDP/IP checksum */
+#define TX_TCPCS_C BIT(30) /* Calculate TCP/IP checksum */
+#define TX_IPCS_C  BIT(29) /* Calculate IP checksum */
+#define TX_IPV6F_C BIT(28) /* Indicate it is an IPv6 packet */
+
+union rx_desc {
+	struct {
+		__le64 header_buf_addr;
+		__le32 reserved1;
+		__le32 opts_header_len;
+		__le64 addr;
+		__le32 reserved2;
+		__le32 opts1;
+	} __packed desc_cmd;
+
+	struct {
+		__le32 reserved1;
+		__le32 reserved2;
+		__le32 rss;
+		__le32 opts4;
+		__le32 reserved3;
+		__le32 opts3;
+		__le32 opts2;
+		__le32 opts1;
+	} __packed desc_status;
+} __packed;
+
+/*------ offset 28 of rx descriptor ------*/
+#define RX_FIRST_FRAG    BIT(25) /* Rx First segment of a packet */
+#define RX_LAST_FRAG     BIT(24) /* Rx Final segment of a packet */
+#define RX_RES           BIT(20)
+#define RX_RUNT          BIT(19)
+#define RX_RWT           BIT(18)
+#define RX_CRC           BIT(16)
+#define RX_V6F           BIT(31)
+#define RX_V4F           BIT(30)
+#define RX_UDPT          BIT(29)
+#define RX_TCPT          BIT(28)
+#define RX_IPF           BIT(26) /* IP checksum failed */
+#define RX_UDPF          BIT(25) /* UDP/IP checksum failed */
+#define RX_TCPF          BIT(24) /* TCP/IP checksum failed */
+#define RX_LBK_FIFO_FULL BIT(17) /* Loopback FIFO Full */
+#define RX_VLAN_TAG      BIT(16) /* VLAN tag available */
+
+#define NUM_DESC                1024
+#define RTASE_TX_RING_DESC_SIZE (NUM_DESC * sizeof(struct tx_desc))
+#define RTASE_RX_RING_DESC_SIZE (NUM_DESC * sizeof(union rx_desc))
+#define VLAN_ENTRY_CAREBIT      0xF0000000
+#define VLAN_TAG_MASK           GENMASK(15, 0)
+#define RX_PKT_SIZE_MASK        GENMASK(13, 0)
+
+#define IVEC_NAME_SIZE (IFNAMSIZ + 10)
+
+struct rtase_int_vector {
+	struct rtase_private *tp;
+	unsigned int irq;
+	u8 status;
+	char name[IVEC_NAME_SIZE];
+	u16 index;
+	u16 imr_addr;
+	u16 isr_addr;
+	u32 imr;
+	struct list_head ring_list;
+	struct napi_struct napi;
+	int (*poll)(struct napi_struct *napi, int budget);
+};
+
+struct rtase_ring {
+	struct rtase_int_vector *ivec;
+	void *desc;
+	dma_addr_t phy_addr;
+	u32 cur_idx;
+	u32 dirty_idx;
+	u16 index;
+
+	struct sk_buff *skbuff[NUM_DESC];
+	union {
+		u32 len[NUM_DESC];
+		dma_addr_t data_phy_addr[NUM_DESC];
+	} mis;
+
+	struct list_head ring_entry;
+	int (*ring_handler)(struct rtase_ring *ring, int budget);
+};
+
+struct rtase_private {
+	void __iomem *mmio_addr;
+	u32 sw_flag;
+
+	struct pci_dev *pdev;
+	struct net_device *dev;
+	u32 rx_buf_sz;
+
+	struct page_pool *page_pool;
+	struct rtase_ring tx_ring[RTASE_NUM_TX_QUEUE];
+	struct rtase_ring rx_ring[RTASE_NUM_RX_QUEUE];
+	struct rtase_counters *tally_vaddr;
+	dma_addr_t tally_paddr;
+
+	u32 vlan_filter_ctrl;
+	u16 vlan_filter_vid[RTASE_VLAN_FILTER_ENTRY_NUM];
+
+	struct msix_entry msix_entry[RTASE_NUM_MSIX];
+	struct rtase_int_vector int_vector[RTASE_NUM_MSIX];
+
+	u16 tx_queue_ctrl;
+	u16 func_tx_queue_num;
+	u16 func_rx_queue_num;
+	u16 int_nums;
+	u16 tx_int_mit;
+	u16 rx_int_mit;
+};
+
+#define LSO_64K 64000
+
+#define NIC_MAX_PHYS_BUF_COUNT_LSO2 (16 * 4)
+
+#define TCPHO_MASK GENMASK(24, 18)
+
+#define MSS_MAX  0x07FF /* MSS value */
+#define MSS_MASK GENMASK(28, 18)
+
+#endif /* _RTASE_H_ */
diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c
new file mode 100644
index 000000000000..9fcc95575105
--- /dev/null
+++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
@@ -0,0 +1,617 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/*
+ *  rtase is the Linux device driver released for Realtek Automotive Switch
+ *  controllers with PCI-Express interface.
+ *
+ *  Copyright(c) 2023 Realtek Semiconductor Corp.
+ *
+ *  Below is a simplified block diagram of the chip and its relevant interfaces.
+ *
+ *               *************************
+ *               *                       *
+ *               *  CPU network device   *
+ *               *                       *
+ *               *   +-------------+     *
+ *               *   |  PCIE Host  |     *
+ *               ***********++************
+ *                          ||
+ *                         PCIE
+ *                          ||
+ *      ********************++**********************
+ *      *            | PCIE Endpoint |             *
+ *      *            +---------------+             *
+ *      *                | GMAC |                  *
+ *      *                +--++--+  Realtek         *
+ *      *                   ||     RTL90xx Series  *
+ *      *                   ||                     *
+ *      *     +-------------++----------------+    *
+ *      *     |           | MAC |             |    *
+ *      *     |           +-----+             |    *
+ *      *     |                               |    *
+ *      *     |     Ethernet Switch Core      |    *
+ *      *     |                               |    *
+ *      *     |   +-----+           +-----+   |    *
+ *      *     |   | MAC |...........| MAC |   |    *
+ *      *     +---+-----+-----------+-----+---+    *
+ *      *         | PHY |...........| PHY |        *
+ *      *         +--++-+           +--++-+        *
+ *      *************||****************||***********
+ *
+ *  The block of the Realtek RTL90xx series is our entire chip architecture,
+ *  the GMAC is connected to the switch core, and there is no PHY in between.
+ *  In addition, this driver is mainly used to control GMAC, but does not
+ *  control the switch core, so it is not the same as DSA.
+ */
+
+#include <linux/crc32.h>
+#include <linux/dma-mapping.h>
+#include <linux/etherdevice.h>
+#include <linux/if_vlan.h>
+#include <linux/in.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/mdio.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/pci.h>
+#include <linux/pm_runtime.h>
+#include <linux/prefetch.h>
+#include <linux/rtnetlink.h>
+#include <linux/tcp.h>
+#include <asm/irq.h>
+#include <net/ip6_checksum.h>
+#include <net/page_pool/helpers.h>
+#include <net/pkt_cls.h>
+
+#include "rtase.h"
+
+#define RTK_OPTS1_DEBUG_VALUE 0x0BADBEEF
+#define RTK_MAGIC_NUMBER      0x0BADBADBADBADBAD
+
+static const struct pci_device_id rtase_pci_tbl[] = {
+	{PCI_VDEVICE(REALTEK, 0x906A)},
+	{}
+};
+
+MODULE_DEVICE_TABLE(pci, rtase_pci_tbl);
+
+MODULE_AUTHOR("Realtek ARD Software Team");
+MODULE_DESCRIPTION("Network Driver for the PCIe interface of Realtek Automotive Ethernet Switch");
+MODULE_LICENSE("Dual BSD/GPL");
+
+struct rtase_counters {
+	__le64 tx_packets;
+	__le64 rx_packets;
+	__le64 tx_errors;
+	__le32 rx_errors;
+	__le16 rx_missed;
+	__le16 align_errors;
+	__le32 tx_one_collision;
+	__le32 tx_multi_collision;
+	__le64 rx_unicast;
+	__le64 rx_broadcast;
+	__le32 rx_multicast;
+	__le16 tx_aborted;
+	__le16 tx_underun;
+} __packed;
+
+static void rtase_w8(const struct rtase_private *tp, u16 reg, u8 val8)
+{
+	writeb(val8, tp->mmio_addr + reg);
+}
+
+static void rtase_w16(const struct rtase_private *tp, u16 reg, u16 val16)
+{
+	writew(val16, tp->mmio_addr + reg);
+}
+
+static void rtase_w32(const struct rtase_private *tp, u16 reg, u32 val32)
+{
+	writel(val32, tp->mmio_addr + reg);
+}
+
+static u8 rtase_r8(const struct rtase_private *tp, u16 reg)
+{
+	return readb(tp->mmio_addr + reg);
+}
+
+static u16 rtase_r16(const struct rtase_private *tp, u16 reg)
+{
+	return readw(tp->mmio_addr + reg);
+}
+
+static u32 rtase_r32(const struct rtase_private *tp, u16 reg)
+{
+	return readl(tp->mmio_addr + reg);
+}
+
+static void rtase_tally_counter_clear(const struct rtase_private *tp)
+{
+	u32 cmd = lower_32_bits(tp->tally_paddr);
+
+	rtase_w32(tp, RTASE_DTCCR4, upper_32_bits(tp->tally_paddr));
+	rtase_w32(tp, RTASE_DTCCR0, cmd | COUNTER_RESET);
+}
+
+static void rtase_enable_eem_write(const struct rtase_private *tp)
+{
+	u8 val;
+
+	val = rtase_r8(tp, RTASE_EEM);
+	rtase_w8(tp, RTASE_EEM, val | EEM_UNLOCK);
+}
+
+static void rtase_disable_eem_write(const struct rtase_private *tp)
+{
+	u8 val;
+
+	val = rtase_r8(tp, RTASE_EEM);
+	rtase_w8(tp, RTASE_EEM, val & ~EEM_UNLOCK);
+}
+
+static void rtase_rar_set(const struct rtase_private *tp, const u8 *addr)
+{
+	u32 rar_low, rar_high;
+
+	rar_low = (u32)addr[0] | ((u32)addr[1] << 8) |
+		  ((u32)addr[2] << 16) | ((u32)addr[3] << 24);
+
+	rar_high = (u32)addr[4] | ((u32)addr[5] << 8);
+
+	rtase_enable_eem_write(tp);
+	rtase_w32(tp, RTASE_MAC0, rar_low);
+	rtase_w32(tp, RTASE_MAC4, rar_high);
+	rtase_disable_eem_write(tp);
+	rtase_w16(tp, RTASE_LBK_CTRL, LBK_ATLD | LBK_CLR);
+}
+
+static void rtase_get_mac_address(struct net_device *dev)
+{
+	struct rtase_private *tp = netdev_priv(dev);
+	u8 mac_addr[ETH_ALEN] __aligned(2) = {};
+	u32 i;
+
+	for (i = 0; i < ETH_ALEN; i++)
+		mac_addr[i] = rtase_r8(tp, RTASE_MAC0 + i);
+
+	if (!is_valid_ether_addr(mac_addr)) {
+		eth_hw_addr_random(dev);
+		netdev_warn(dev, "Random ether addr %pM\n", dev->dev_addr);
+	} else {
+		eth_hw_addr_set(dev, mac_addr);
+		ether_addr_copy(dev->perm_addr, dev->dev_addr);
+	}
+
+	rtase_rar_set(tp, dev->dev_addr);
+}
+
+static void rtase_reset_interrupt(struct pci_dev *pdev,
+				  const struct rtase_private *tp)
+{
+	if (tp->sw_flag & SWF_MSIX_ENABLED)
+		pci_disable_msix(pdev);
+	else
+		pci_disable_msi(pdev);
+}
+
+static int rtase_alloc_msix(struct pci_dev *pdev, struct rtase_private *tp)
+{
+	int ret;
+	u16 i;
+
+	memset(tp->msix_entry, 0x0, RTASE_NUM_MSIX * sizeof(struct msix_entry));
+
+	for (i = 0; i < RTASE_NUM_MSIX; i++)
+		tp->msix_entry[i].entry = i;
+
+	ret = pci_enable_msix_exact(pdev, tp->msix_entry, tp->int_nums);
+
+	if (!ret) {
+		for (i = 0; i < tp->int_nums; i++) {
+			tp->int_vector[i].irq = pci_irq_vector(pdev, i);
+			tp->int_vector[i].status = 1;
+		}
+	}
+
+	return ret;
+}
+
+static int rtase_alloc_interrupt(struct pci_dev *pdev,
+				 struct rtase_private *tp)
+{
+	int ret;
+
+	ret = rtase_alloc_msix(pdev, tp);
+	if (ret) {
+		ret = pci_enable_msi(pdev);
+		if (ret)
+			dev_err(&pdev->dev,
+				"unable to alloc interrupt.(MSI)\n");
+		else
+			tp->sw_flag |= SWF_MSI_ENABLED;
+	} else {
+		tp->sw_flag |= SWF_MSIX_ENABLED;
+	}
+
+	return ret;
+}
+
+static void rtase_init_hardware(const struct rtase_private *tp)
+{
+	u16 i;
+
+	for (i = 0; i < RTASE_VLAN_FILTER_ENTRY_NUM; i++)
+		rtase_w32(tp, RTASE_VLAN_ENTRY_0 + i * 4, 0);
+}
+
+static void rtase_init_int_vector(struct rtase_private *tp)
+{
+	u16 i;
+
+	/* interrupt vector 0 */
+	tp->int_vector[0].tp = tp;
+	tp->int_vector[0].index = 0;
+	tp->int_vector[0].imr_addr = RTASE_IMR0;
+	tp->int_vector[0].isr_addr = RTASE_ISR0;
+	tp->int_vector[0].imr = ROK | RDU | TOK | TOK4 | TOK5 | TOK6 | TOK7;
+	tp->int_vector[0].poll = rtase_poll;
+
+	memset(tp->int_vector[0].name, 0x0, sizeof(tp->int_vector[0].name));
+	INIT_LIST_HEAD(&tp->int_vector[0].ring_list);
+
+	netif_napi_add(tp->dev, &tp->int_vector[0].napi,
+		       tp->int_vector[0].poll);
+
+	/* interrupt vector 1 ~ 3 */
+	for (i = 1; i < tp->int_nums; i++) {
+		tp->int_vector[i].tp = tp;
+		tp->int_vector[i].index = i;
+		tp->int_vector[i].imr_addr = RTASE_IMR1 + (i - 1) * 4;
+		tp->int_vector[i].isr_addr = RTASE_ISR1 + (i - 1) * 4;
+		tp->int_vector[i].imr = Q_ROK | Q_RDU | Q_TOK;
+		tp->int_vector[i].poll = rtase_poll;
+
+		memset(tp->int_vector[i].name, 0x0, sizeof(tp->int_vector[0].name));
+		INIT_LIST_HEAD(&tp->int_vector[i].ring_list);
+
+		netif_napi_add(tp->dev, &tp->int_vector[i].napi,
+			       tp->int_vector[i].poll);
+	}
+}
+
+static u16 rtase_calc_time_mitigation(u32 time_us)
+{
+	u8 msb, time_count, time_unit;
+	u16 int_miti;
+
+	time_us = min_t(int, time_us, MITI_MAX_TIME);
+
+	msb = fls(time_us);
+	if (msb >= MITI_COUNT_BIT_NUM) {
+		time_unit = msb - MITI_COUNT_BIT_NUM;
+		time_count = time_us >> (msb - MITI_COUNT_BIT_NUM);
+	} else {
+		time_unit = 0;
+		time_count = time_us;
+	}
+
+	int_miti = u16_encode_bits(time_count, MITI_TIME_COUNT_MASK) |
+		   u16_encode_bits(time_unit, MITI_TIME_UNIT_MASK);
+
+	return int_miti;
+}
+
+static u16 rtase_calc_packet_num_mitigation(u16 pkt_num)
+{
+	u8 msb, pkt_num_count, pkt_num_unit;
+	u16 int_miti;
+
+	pkt_num = min_t(int, pkt_num, MITI_MAX_PKT_NUM);
+
+	if (pkt_num > 60) {
+		pkt_num_unit = MITI_MAX_PKT_NUM_IDX;
+		pkt_num_count = pkt_num / MITI_MAX_PKT_NUM_UNIT;
+	} else {
+		msb = fls(pkt_num);
+		if (msb >= MITI_COUNT_BIT_NUM) {
+			pkt_num_unit = msb - MITI_COUNT_BIT_NUM;
+			pkt_num_count = pkt_num >> (msb - MITI_COUNT_BIT_NUM);
+		} else {
+			pkt_num_unit = 0;
+			pkt_num_count = pkt_num;
+		}
+	}
+
+	int_miti = u16_encode_bits(pkt_num_count, MITI_PKT_NUM_COUNT_MASK) |
+		   u16_encode_bits(pkt_num_unit, MITI_PKT_NUM_UNIT_MASK);
+
+	return int_miti;
+}
+
+static void rtase_init_software_variable(struct pci_dev *pdev,
+					 struct rtase_private *tp)
+{
+	u16 int_miti;
+
+	tp->tx_queue_ctrl = RTASE_TXQ_CTRL;
+	tp->func_tx_queue_num = RTASE_FUNC_TXQ_NUM;
+	tp->func_rx_queue_num = RTASE_FUNC_RXQ_NUM;
+	tp->int_nums = RTASE_INTERRUPT_NUM;
+
+	int_miti = rtase_calc_time_mitigation(MITI_DEFAULT_TIME) |
+		   rtase_calc_packet_num_mitigation(MITI_DEFAULT_PKT_NUM);
+	tp->tx_int_mit = int_miti;
+	tp->rx_int_mit = int_miti;
+
+	tp->sw_flag = 0;
+
+	rtase_init_int_vector(tp);
+
+	/* MTU range: 60 - hw-specific max */
+	tp->dev->min_mtu = ETH_ZLEN;
+	tp->dev->max_mtu = MAX_JUMBO_SIZE;
+}
+
+static bool rtase_check_mac_version_valid(struct rtase_private *tp)
+{
+	u32 hw_ver = rtase_r32(tp, RTASE_TX_CONFIG_0) & HW_VER_MASK;
+	bool known_ver = false;
+
+	switch (hw_ver) {
+	case 0x00800000:
+	case 0x04000000:
+	case 0x04800000:
+		known_ver = true;
+		break;
+	}
+
+	return known_ver;
+}
+
+static int rtase_init_board(struct pci_dev *pdev, struct net_device **dev_out,
+			    void __iomem **ioaddr_out)
+{
+	struct net_device *dev;
+	void __iomem *ioaddr;
+	int ret = -ENOMEM;
+
+	/* dev zeroed in alloc_etherdev */
+	dev = alloc_etherdev_mq(sizeof(struct rtase_private),
+				RTASE_FUNC_TXQ_NUM);
+	if (!dev)
+		goto err_out;
+
+	SET_NETDEV_DEV(dev, &pdev->dev);
+
+	ret = pci_enable_device(pdev);
+	if (ret < 0)
+		goto err_out_free_dev;
+
+	/* make sure PCI base addr 1 is MMIO */
+	if (!(pci_resource_flags(pdev, 2) & IORESOURCE_MEM)) {
+		ret = -ENODEV;
+		goto err_out_disable;
+	}
+
+	/* check for weird/broken PCI region reporting */
+	if (pci_resource_len(pdev, 2) < RTASE_REGS_SIZE) {
+		ret = -ENODEV;
+		goto err_out_disable;
+	}
+
+	ret = pci_request_regions(pdev, KBUILD_MODNAME);
+	if (ret < 0)
+		goto err_out_disable;
+
+	if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) {
+		dev_err(&pdev->dev, "no usable dma addressing method\n");
+		goto err_out_free_res;
+	}
+
+	pci_set_master(pdev);
+
+	/* ioremap MMIO region */
+	ioaddr = ioremap(pci_resource_start(pdev, 2),
+			 pci_resource_len(pdev, 2));
+	if (!ioaddr) {
+		ret = -EIO;
+		goto err_out_free_res;
+	}
+
+	*ioaddr_out = ioaddr;
+	*dev_out = dev;
+
+	return ret;
+
+err_out_free_res:
+	pci_release_regions(pdev);
+
+err_out_disable:
+	pci_disable_device(pdev);
+
+err_out_free_dev:
+	free_netdev(dev);
+
+err_out:
+	*ioaddr_out = NULL;
+	*dev_out = NULL;
+
+	return ret;
+}
+
+static void rtase_release_board(struct pci_dev *pdev, struct net_device *dev,
+				void __iomem *ioaddr)
+{
+	const struct rtase_private *tp = netdev_priv(dev);
+
+	rtase_rar_set(tp, tp->dev->perm_addr);
+	iounmap(ioaddr);
+
+	if ((tp->sw_flag & SWF_MSIX_ENABLED))
+		pci_disable_msix(pdev);
+	else
+		pci_disable_msi(pdev);
+
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+	free_netdev(dev);
+}
+
+static int rtase_init_one(struct pci_dev *pdev,
+			  const struct pci_device_id *ent)
+{
+	struct net_device *dev = NULL;
+	struct rtase_int_vector *ivec;
+	void __iomem *ioaddr = NULL;
+	struct rtase_private *tp;
+	int ret, i;
+
+	if (!pdev->is_physfn && pdev->is_virtfn) {
+		dev_err(&pdev->dev, "This module does not support a virtual function.");
+		return -EINVAL;
+	}
+
+	dev_dbg(&pdev->dev, "Automotive Switch Ethernet driver loaded\n");
+
+	ret = rtase_init_board(pdev, &dev, &ioaddr);
+	if (ret != 0)
+		return ret;
+
+	tp = netdev_priv(dev);
+	tp->mmio_addr = ioaddr;
+	tp->dev = dev;
+	tp->pdev = pdev;
+
+	/* identify chip attached to board */
+	if (!rtase_check_mac_version_valid(tp)) {
+		return dev_err_probe(&pdev->dev, -ENODEV,
+				     "unknown chip version, contact rtase maintainers (see MAINTAINERS file)\n");
+	}
+
+	rtase_init_software_variable(pdev, tp);
+	rtase_init_hardware(tp);
+
+	ret = rtase_alloc_interrupt(pdev, tp);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to alloc MSIX/MSI\n");
+		goto err_out_1;
+	}
+
+	rtase_init_netdev_ops(dev);
+
+	dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
+
+	dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
+
+	dev->features |= NETIF_F_IP_CSUM;
+	dev->features |= NETIF_F_HIGHDMA;
+	dev->features |= NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_TSO;
+	dev->features |= NETIF_F_IPV6_CSUM | NETIF_F_TSO6;
+	dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO |
+			   NETIF_F_RXCSUM | NETIF_F_HW_VLAN_CTAG_TX |
+			   NETIF_F_HW_VLAN_CTAG_RX;
+	dev->hw_features |= NETIF_F_RXALL;
+	dev->hw_features |= NETIF_F_RXFCS;
+	dev->hw_features |= NETIF_F_IPV6_CSUM | NETIF_F_TSO6;
+	dev->vlan_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO |
+			     NETIF_F_HIGHDMA;
+	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
+	netif_set_tso_max_size(dev, LSO_64K);
+	netif_set_tso_max_segs(dev, NIC_MAX_PHYS_BUF_COUNT_LSO2);
+
+	rtase_get_mac_address(dev);
+
+	tp->tally_vaddr = dma_alloc_coherent(&pdev->dev,
+					     sizeof(*tp->tally_vaddr),
+					     &tp->tally_paddr,
+					     GFP_KERNEL);
+	if (!tp->tally_vaddr) {
+		ret = -ENOMEM;
+		goto err_out;
+	}
+
+	rtase_tally_counter_clear(tp);
+
+	pci_set_drvdata(pdev, dev);
+
+	netif_carrier_off(dev);
+
+	ret = register_netdev(dev);
+	if (ret != 0)
+		goto err_out;
+
+	netdev_dbg(dev, "%pM, IRQ %d\n", dev->dev_addr, dev->irq);
+
+	return 0;
+
+err_out:
+	if (tp->tally_vaddr) {
+		dma_free_coherent(&pdev->dev,
+				  sizeof(*tp->tally_vaddr),
+				  tp->tally_vaddr,
+				  tp->tally_paddr);
+
+		tp->tally_vaddr = NULL;
+	}
+
+err_out_1:
+	for (i = 0; i < tp->int_nums; i++) {
+		ivec = &tp->int_vector[i];
+		netif_napi_del(&ivec->napi);
+	}
+
+	rtase_release_board(pdev, dev, ioaddr);
+
+	return ret;
+}
+
+static void rtase_remove_one(struct pci_dev *pdev)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+	struct rtase_private *tp = netdev_priv(dev);
+	struct rtase_int_vector *ivec;
+	u32 i;
+
+	for (i = 0; i < tp->int_nums; i++) {
+		ivec = &tp->int_vector[i];
+		netif_napi_del(&ivec->napi);
+	}
+
+	unregister_netdev(dev);
+	rtase_reset_interrupt(pdev, tp);
+	if (tp->tally_vaddr) {
+		dma_free_coherent(&pdev->dev,
+				  sizeof(*tp->tally_vaddr),
+				  tp->tally_vaddr,
+				  tp->tally_paddr);
+		tp->tally_vaddr = NULL;
+	}
+
+	rtase_release_board(pdev, dev, tp->mmio_addr);
+	pci_set_drvdata(pdev, NULL);
+}
+
+static void rtase_shutdown(struct pci_dev *pdev)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+	const struct rtase_private *tp = netdev_priv(dev);
+
+	if (netif_running(dev))
+		rtase_close(dev);
+
+	rtase_reset_interrupt(pdev, tp);
+}
+
+static struct pci_driver rtase_pci_driver = {
+	.name = KBUILD_MODNAME,
+	.id_table = rtase_pci_tbl,
+	.probe = rtase_init_one,
+	.remove = rtase_remove_one,
+	.shutdown = rtase_shutdown,
+};
+
+module_pci_driver(rtase_pci_driver);
-- 
2.34.1

[PATCH net-next v14 02/13] rtase: Implement the .ndo_open function

[Justin Lai]

Implement the .ndo_open function to set default hardware settings
and initialize the descriptor ring and interrupts. Among them,
when requesting irq, because the first group of interrupts needs to
process more events, the overall structure will be different from
other groups of interrupts, so it needs to be processed separately.

Signed-off-by: Justin Lai <justinlai0215@realtek.com>
---
 .../net/ethernet/realtek/rtase/rtase_main.c   | 421 ++++++++++++++++++
 1 file changed, 421 insertions(+)

diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c
index 9fcc95575105..78a21a9877c4 100644
--- a/drivers/net/ethernet/realtek/rtase/rtase_main.c
+++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
@@ -129,6 +129,291 @@ static u32 rtase_r32(const struct rtase_private *tp, u16 reg)
 	return readl(tp->mmio_addr + reg);
 }
 
+static void rtase_set_rxbufsize(struct rtase_private *tp)
+{
+	tp->rx_buf_sz = RX_BUF_SIZE;
+}
+
+static int rtase_alloc_desc(struct rtase_private *tp)
+{
+	struct pci_dev *pdev = tp->pdev;
+	u32 i;
+
+	/* rx and tx descriptors needs 256 bytes alignment.
+	 * dma_alloc_coherent provides more.
+	 */
+	for (i = 0; i < tp->func_tx_queue_num; i++) {
+		tp->tx_ring[i].desc = dma_alloc_coherent(&pdev->dev,
+							 RTASE_TX_RING_DESC_SIZE,
+							 &tp->tx_ring[i].phy_addr,
+							 GFP_KERNEL);
+		if (!tp->tx_ring[i].desc)
+			return -ENOMEM;
+	}
+
+	for (i = 0; i < tp->func_rx_queue_num; i++) {
+		tp->rx_ring[i].desc =
+			dma_alloc_coherent(&pdev->dev, RTASE_RX_RING_DESC_SIZE,
+					   &tp->rx_ring[i].phy_addr,
+					   GFP_KERNEL);
+		if (!tp->rx_ring[i].desc)
+			return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static void rtase_free_desc(struct rtase_private *tp)
+{
+	struct pci_dev *pdev = tp->pdev;
+	u32 i;
+
+	for (i = 0; i < tp->func_tx_queue_num; i++) {
+		if (!tp->tx_ring[i].desc)
+			continue;
+
+		dma_free_coherent(&pdev->dev, RTASE_TX_RING_DESC_SIZE,
+				  tp->tx_ring[i].desc,
+				  tp->tx_ring[i].phy_addr);
+		tp->tx_ring[i].desc = NULL;
+	}
+
+	for (i = 0; i < tp->func_rx_queue_num; i++) {
+		if (!tp->rx_ring[i].desc)
+			continue;
+
+		dma_free_coherent(&pdev->dev, RTASE_RX_RING_DESC_SIZE,
+				  tp->rx_ring[i].desc,
+				  tp->rx_ring[i].phy_addr);
+		tp->rx_ring[i].desc = NULL;
+	}
+}
+
+static void rtase_mark_to_asic(union rx_desc *desc, u32 rx_buf_sz)
+{
+	u32 eor = le32_to_cpu(desc->desc_cmd.opts1) & RING_END;
+
+	desc->desc_status.opts2 = 0;
+	/* force memory writes to complete before releasing descriptor */
+	dma_wmb();
+	WRITE_ONCE(desc->desc_cmd.opts1,
+		   cpu_to_le32(DESC_OWN | eor | rx_buf_sz));
+}
+
+static void rtase_tx_desc_init(struct rtase_private *tp, u16 idx)
+{
+	struct rtase_ring *ring = &tp->tx_ring[idx];
+	struct tx_desc *desc;
+	u32 i;
+
+	memset(ring->desc, 0x0, RTASE_TX_RING_DESC_SIZE);
+	memset(ring->skbuff, 0x0, sizeof(ring->skbuff));
+	ring->cur_idx = 0;
+	ring->dirty_idx = 0;
+	ring->index = idx;
+
+	for (i = 0; i < NUM_DESC; i++) {
+		ring->mis.len[i] = 0;
+		if ((NUM_DESC - 1) == i) {
+			desc = ring->desc + sizeof(struct tx_desc) * i;
+			desc->opts1 = cpu_to_le32(RING_END);
+		}
+	}
+
+	ring->ring_handler = tx_handler;
+	if (idx < 4) {
+		ring->ivec = &tp->int_vector[idx];
+		list_add_tail(&ring->ring_entry,
+			      &tp->int_vector[idx].ring_list);
+	} else {
+		ring->ivec = &tp->int_vector[0];
+		list_add_tail(&ring->ring_entry, &tp->int_vector[0].ring_list);
+	}
+}
+
+static void rtase_map_to_asic(union rx_desc *desc, dma_addr_t mapping,
+			      u32 rx_buf_sz)
+{
+	desc->desc_cmd.addr = cpu_to_le64(mapping);
+	/* make sure the physical address has been updated */
+	wmb();
+	rtase_mark_to_asic(desc, rx_buf_sz);
+}
+
+static void rtase_make_unusable_by_asic(union rx_desc *desc)
+{
+	desc->desc_cmd.addr = cpu_to_le64(RTK_MAGIC_NUMBER);
+	desc->desc_cmd.opts1 &= ~cpu_to_le32(DESC_OWN | RSVD_MASK);
+}
+
+static int rtase_alloc_rx_skb(const struct rtase_ring *ring,
+			      struct sk_buff **p_sk_buff, union rx_desc *desc,
+			      dma_addr_t *rx_phy_addr, u8 in_intr)
+{
+	struct rtase_int_vector *ivec = ring->ivec;
+	const struct rtase_private *tp = ivec->tp;
+	struct sk_buff *skb = NULL;
+	dma_addr_t mapping;
+	struct page *page;
+	void *buf_addr;
+	int ret = 0;
+
+	page = page_pool_dev_alloc_pages(tp->page_pool);
+	if (!page) {
+		netdev_err(tp->dev, "failed to alloc page\n");
+		goto err_out;
+	}
+
+	buf_addr = page_address(page);
+	mapping = page_pool_get_dma_addr(page);
+
+	skb = build_skb(buf_addr, PAGE_SIZE);
+	if (!skb) {
+		page_pool_put_full_page(tp->page_pool, page, true);
+		netdev_err(tp->dev, "failed to build skb\n");
+		goto err_out;
+	}
+
+	*p_sk_buff = skb;
+	*rx_phy_addr = mapping;
+	rtase_map_to_asic(desc, mapping, tp->rx_buf_sz);
+
+	return ret;
+
+err_out:
+	if (skb)
+		dev_kfree_skb(skb);
+
+	ret = -ENOMEM;
+	rtase_make_unusable_by_asic(desc);
+
+	return ret;
+}
+
+static u32 rtase_rx_ring_fill(struct rtase_ring *ring, u32 ring_start,
+			      u32 ring_end, u8 in_intr)
+{
+	union rx_desc *desc_base = ring->desc;
+	u32 cur;
+
+	for (cur = ring_start; ring_end - cur > 0; cur++) {
+		u32 i = cur % NUM_DESC;
+		union rx_desc *desc = desc_base + i;
+		int ret;
+
+		if (ring->skbuff[i])
+			continue;
+
+		ret = rtase_alloc_rx_skb(ring, &ring->skbuff[i], desc,
+					 &ring->mis.data_phy_addr[i],
+					 in_intr);
+		if (ret)
+			break;
+	}
+
+	return cur - ring_start;
+}
+
+static void rtase_mark_as_last_descriptor(union rx_desc *desc)
+{
+	desc->desc_cmd.opts1 |= cpu_to_le32(RING_END);
+}
+
+static void rtase_rx_ring_clear(struct rtase_ring *ring)
+{
+	union rx_desc *desc;
+	u32 i;
+
+	for (i = 0; i < NUM_DESC; i++) {
+		desc = ring->desc + sizeof(union rx_desc) * i;
+
+		if (!ring->skbuff[i])
+			continue;
+
+		dev_kfree_skb(ring->skbuff[i]);
+
+		ring->skbuff[i] = NULL;
+
+		rtase_make_unusable_by_asic(desc);
+	}
+}
+
+static void rtase_rx_desc_init(struct rtase_private *tp, u16 idx)
+{
+	struct rtase_ring *ring = &tp->rx_ring[idx];
+	u16 i;
+
+	memset(ring->desc, 0x0, RTASE_RX_RING_DESC_SIZE);
+	memset(ring->skbuff, 0x0, sizeof(ring->skbuff));
+	ring->cur_idx = 0;
+	ring->dirty_idx = 0;
+	ring->index = idx;
+
+	for (i = 0; i < NUM_DESC; i++)
+		ring->mis.data_phy_addr[i] = 0;
+
+	ring->ring_handler = rx_handler;
+	ring->ivec = &tp->int_vector[idx];
+	list_add_tail(&ring->ring_entry, &tp->int_vector[idx].ring_list);
+}
+
+static void rtase_rx_clear(struct rtase_private *tp)
+{
+	u32 i;
+
+	for (i = 0; i < tp->func_rx_queue_num; i++)
+		rtase_rx_ring_clear(&tp->rx_ring[i]);
+
+	page_pool_destroy(tp->page_pool);
+	tp->page_pool = NULL;
+}
+
+static int rtase_init_ring(const struct net_device *dev)
+{
+	struct rtase_private *tp = netdev_priv(dev);
+	struct page_pool_params pp_params = {
+		.flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV,
+		.order = 0,
+		.pool_size = NUM_DESC * tp->func_rx_queue_num,
+		.nid = dev_to_node(&tp->pdev->dev),
+		.dev = &tp->pdev->dev,
+		.dma_dir = DMA_FROM_DEVICE,
+		.max_len = PAGE_SIZE,
+		.offset = 0,
+	};
+	struct page_pool *page_pool;
+	u32 num;
+	u16 i;
+
+	page_pool = page_pool_create(&pp_params);
+	if (IS_ERR(page_pool)) {
+		netdev_err(tp->dev, "failed to create page pool\n");
+		return -ENOMEM;
+	}
+
+	tp->page_pool = page_pool;
+
+	for (i = 0; i < tp->func_tx_queue_num; i++)
+		rtase_tx_desc_init(tp, i);
+
+	for (i = 0; i < tp->func_rx_queue_num; i++) {
+		rtase_rx_desc_init(tp, i);
+		num = rtase_rx_ring_fill(&tp->rx_ring[i], 0, NUM_DESC, 0);
+		if (num != NUM_DESC)
+			goto err_out;
+
+		rtase_mark_as_last_descriptor(tp->rx_ring[i].desc +
+					      sizeof(union rx_desc) *
+					      (NUM_DESC - 1));
+	}
+
+	return 0;
+
+err_out:
+	rtase_rx_clear(tp);
+	return -ENOMEM;
+}
+
 static void rtase_tally_counter_clear(const struct rtase_private *tp)
 {
 	u32 cmd = lower_32_bits(tp->tally_paddr);
@@ -137,6 +422,132 @@ static void rtase_tally_counter_clear(const struct rtase_private *tp)
 	rtase_w32(tp, RTASE_DTCCR0, cmd | COUNTER_RESET);
 }
 
+static void rtase_nic_enable(const struct net_device *dev)
+{
+	const struct rtase_private *tp = netdev_priv(dev);
+	u16 rcr = rtase_r16(tp, RTASE_RX_CONFIG_1);
+	u8 val;
+
+	rtase_w16(tp, RTASE_RX_CONFIG_1, rcr & ~PCIE_RELOAD_En);
+	rtase_w16(tp, RTASE_RX_CONFIG_1, rcr | PCIE_RELOAD_En);
+
+	val = rtase_r8(tp, RTASE_CHIP_CMD);
+	rtase_w8(tp, RTASE_CHIP_CMD, val | TE | RE);
+
+	val = rtase_r8(tp, RTASE_MISC);
+	rtase_w8(tp, RTASE_MISC, val & ~RX_DV_GATE_EN);
+}
+
+static void rtase_enable_hw_interrupt(const struct rtase_private *tp)
+{
+	const struct rtase_int_vector *ivec = &tp->int_vector[0];
+	u32 i;
+
+	rtase_w32(tp, ivec->imr_addr, ivec->imr);
+
+	for (i = 1; i < tp->int_nums; i++) {
+		ivec = &tp->int_vector[i];
+		rtase_w16(tp, ivec->imr_addr, ivec->imr);
+	}
+}
+
+static void rtase_hw_start(const struct net_device *dev)
+{
+	const struct rtase_private *tp = netdev_priv(dev);
+
+	rtase_nic_enable(dev);
+	rtase_enable_hw_interrupt(tp);
+}
+
+static int rtase_open(struct net_device *dev)
+{
+	struct rtase_private *tp = netdev_priv(dev);
+	struct rtase_int_vector *ivec = &tp->int_vector[0];
+	const struct pci_dev *pdev = tp->pdev;
+	int ret;
+	u16 i;
+
+	rtase_set_rxbufsize(tp);
+
+	ret = rtase_alloc_desc(tp);
+	if (ret)
+		goto err_free_all_allocated_mem;
+
+	ret = rtase_init_ring(dev);
+	if (ret)
+		goto err_free_all_allocated_mem;
+
+	rtase_hw_config(dev);
+
+	if (tp->sw_flag & SWF_MSIX_ENABLED) {
+		ret = request_irq(ivec->irq, rtase_interrupt, 0,
+				  dev->name, ivec);
+
+		/* request other interrupts to handle multiqueue */
+		for (i = 1; i < tp->int_nums; i++) {
+			if (ret)
+				continue;
+
+			ivec = &tp->int_vector[i];
+			if (ivec->status != 1)
+				continue;
+
+			snprintf(ivec->name, sizeof(ivec->name), "%s_int%i", tp->dev->name, i);
+			ret = request_irq(ivec->irq, rtase_q_interrupt, 0,
+					  ivec->name, ivec);
+		}
+	} else if (tp->sw_flag & SWF_MSI_ENABLED) {
+		ret = request_irq(pdev->irq, rtase_interrupt, 0, dev->name,
+				  ivec);
+	} else {
+		ret = request_irq(pdev->irq, rtase_interrupt, IRQF_SHARED,
+				  dev->name, ivec);
+	}
+
+	if (ret != 0) {
+		netdev_err(dev, "can't request MSIX interrupt. Error: %d\n", ret);
+		goto err_free_all_allocated_mem;
+	}
+
+	rtase_hw_start(dev);
+
+	for (i = 0; i < tp->int_nums; i++) {
+		ivec = &tp->int_vector[i];
+		napi_enable(&ivec->napi);
+	}
+
+	netif_carrier_on(dev);
+	netif_wake_queue(dev);
+
+	return 0;
+
+err_free_all_allocated_mem:
+	rtase_free_desc(tp);
+
+	return ret;
+}
+
+static int rtase_close(struct net_device *dev)
+{
+	struct rtase_private *tp = netdev_priv(dev);
+	const struct pci_dev *pdev = tp->pdev;
+	u32 i;
+
+	rtase_down(dev);
+
+	if (tp->sw_flag & SWF_MSIX_ENABLED) {
+		for (i = 0; i < tp->int_nums; i++)
+			free_irq(tp->int_vector[i].irq, &tp->int_vector[i]);
+
+	} else {
+		free_irq(pdev->irq, &tp->int_vector[0]);
+	}
+
+	rtase_free_desc(tp);
+
+	return 0;
+}
+
 static void rtase_enable_eem_write(const struct rtase_private *tp)
 {
 	u8 val;
@@ -169,6 +580,11 @@ static void rtase_rar_set(const struct rtase_private *tp, const u8 *addr)
 	rtase_w16(tp, RTASE_LBK_CTRL, LBK_ATLD | LBK_CLR);
 }
 
+static const struct net_device_ops rtase_netdev_ops = {
+	.ndo_open = rtase_open,
+	.ndo_stop = rtase_close,
+};
+
 static void rtase_get_mac_address(struct net_device *dev)
 {
 	struct rtase_private *tp = netdev_priv(dev);
@@ -189,6 +605,11 @@ static void rtase_get_mac_address(struct net_device *dev)
 	rtase_rar_set(tp, dev->dev_addr);
 }
 
+static void rtase_init_netdev_ops(struct net_device *dev)
+{
+	dev->netdev_ops = &rtase_netdev_ops;
+}
+
 static void rtase_reset_interrupt(struct pci_dev *pdev,
 				  const struct rtase_private *tp)
 {
-- 
2.34.1

[PATCH net-next v14 03/13] rtase: Implement the rtase_down function

[Justin Lai]

Implement the rtase_down function to disable hardware setting
and interrupt and clear descriptor ring.

Signed-off-by: Justin Lai <justinlai0215@realtek.com>
---
 .../net/ethernet/realtek/rtase/rtase_main.c   | 149 ++++++++++++++++++
 1 file changed, 149 insertions(+)

diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c
index 78a21a9877c4..a4fe0e0ca721 100644
--- a/drivers/net/ethernet/realtek/rtase/rtase_main.c
+++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
@@ -189,6 +189,57 @@ static void rtase_free_desc(struct rtase_private *tp)
 	}
 }
 
+static void rtase_unmap_tx_skb(struct pci_dev *pdev, u32 len,
+			       struct tx_desc *desc)
+{
+	dma_unmap_single(&pdev->dev, le64_to_cpu(desc->addr), len,
+			 DMA_TO_DEVICE);
+	desc->opts1 = cpu_to_le32(RTK_OPTS1_DEBUG_VALUE);
+	desc->opts2 = 0x00;
+	desc->addr = cpu_to_le64(RTK_MAGIC_NUMBER);
+}
+
+static void rtase_tx_clear_range(struct rtase_ring *ring, u32 start, u32 n)
+{
+	const struct rtase_private *tp = ring->ivec->tp;
+	struct tx_desc *desc_base = ring->desc;
+	struct net_device *dev = tp->dev;
+	u32 i;
+
+	for (i = 0; i < n; i++) {
+		u32 entry = (start + i) % NUM_DESC;
+		struct tx_desc *desc = desc_base + entry;
+		u32 len = ring->mis.len[entry];
+		struct sk_buff *skb;
+
+		if (len == 0)
+			continue;
+
+		rtase_unmap_tx_skb(tp->pdev, len, desc);
+		ring->mis.len[entry] = 0;
+		skb = ring->skbuff[entry];
+		if (!skb)
+			continue;
+
+		dev->stats.tx_dropped++;
+		dev_kfree_skb_any(skb);
+		ring->skbuff[entry] = NULL;
+	}
+}
+
+static void rtase_tx_clear(struct rtase_private *tp)
+{
+	struct rtase_ring *ring;
+	u16 i;
+
+	for (i = 0; i < tp->func_tx_queue_num; i++) {
+		ring = &tp->tx_ring[i];
+		rtase_tx_clear_range(ring, ring->dirty_idx, NUM_DESC);
+		ring->cur_idx = 0;
+		ring->dirty_idx = 0;
+	}
+}
+
 static void rtase_mark_to_asic(union rx_desc *desc, u32 rx_buf_sz)
 {
 	u32 eor = le32_to_cpu(desc->desc_cmd.opts1) & RING_END;
@@ -422,6 +473,77 @@ static void rtase_tally_counter_clear(const struct rtase_private *tp)
 	rtase_w32(tp, RTASE_DTCCR0, cmd | COUNTER_RESET);
 }
 
+static void rtase_irq_dis_and_clear(const struct rtase_private *tp)
+{
+	const struct rtase_int_vector *ivec = &tp->int_vector[0];
+	u32 val1;
+	u16 val2;
+	u8 i;
+
+	rtase_w32(tp, ivec->imr_addr, 0);
+	val1 = rtase_r32(tp, ivec->isr_addr);
+	rtase_w32(tp, ivec->isr_addr, val1);
+
+	for (i = 1; i < tp->int_nums; i++) {
+		ivec = &tp->int_vector[i];
+		rtase_w16(tp, ivec->imr_addr, 0);
+		val2 = rtase_r16(tp, ivec->isr_addr);
+		rtase_w16(tp, ivec->isr_addr, val2);
+	}
+}
+
+static void rtase_poll_timeout(const struct rtase_private *tp, u32 cond,
+			       u32 sleep_us, u64 timeout_us, u16 reg)
+{
+	int err;
+	u8 val;
+
+	err = read_poll_timeout(rtase_r8, val, val & cond, sleep_us, timeout_us,
+				false, tp, reg);
+
+	if (err == -ETIMEDOUT)
+		netdev_err(tp->dev, "poll reg 0x00%x timeout\n", reg);
+}
+
+static void rtase_nic_reset(const struct net_device *dev)
+{
+	const struct rtase_private *tp = netdev_priv(dev);
+	u16 rx_config;
+	u8 val;
+
+	rx_config = rtase_r16(tp, RTASE_RX_CONFIG_0);
+	rtase_w16(tp, RTASE_RX_CONFIG_0, rx_config & ~ACCEPT_MASK);
+
+	val = rtase_r8(tp, RTASE_MISC);
+	rtase_w8(tp, RTASE_MISC, val | RX_DV_GATE_EN);
+
+	val = rtase_r8(tp, RTASE_CHIP_CMD);
+	rtase_w8(tp, RTASE_CHIP_CMD, val | STOP_REQ);
+	mdelay(2);
+
+	rtase_poll_timeout(tp, STOP_REQ_DONE, 100, 150000, RTASE_CHIP_CMD);
+
+	rtase_poll_timeout(tp, TX_FIFO_EMPTY, 100, 100000, RTASE_FIFOR);
+
+	rtase_poll_timeout(tp, RX_FIFO_EMPTY, 100, 100000, RTASE_FIFOR);
+
+	val = rtase_r8(tp, RTASE_CHIP_CMD);
+	rtase_w8(tp, RTASE_CHIP_CMD, val & ~(TE | RE));
+	val = rtase_r8(tp, RTASE_CHIP_CMD);
+	rtase_w8(tp, RTASE_CHIP_CMD, val & ~STOP_REQ);
+
+	rtase_w16(tp, RTASE_RX_CONFIG_0, rx_config);
+}
+
+static void rtase_hw_reset(const struct net_device *dev)
+{
+	const struct rtase_private *tp = netdev_priv(dev);
+
+	rtase_irq_dis_and_clear(tp);
+
+	rtase_nic_reset(dev);
+}
+
 static void rtase_nic_enable(const struct net_device *dev)
 {
 	const struct rtase_private *tp = netdev_priv(dev);
@@ -527,6 +649,33 @@ static int rtase_open(struct net_device *dev)
 	return ret;
 }
 
+static void rtase_down(struct net_device *dev)
+{
+	struct rtase_private *tp = netdev_priv(dev);
+	struct rtase_int_vector *ivec;
+	u32 i;
+
+	netif_stop_queue(dev);
+
+	/* give a racing hard_start_xmit a few cycles to complete */
+	synchronize_rcu();
+
+	netif_carrier_off(dev);
+
+	for (i = 0; i < tp->int_nums; i++) {
+		ivec = &tp->int_vector[i];
+		synchronize_irq(ivec->irq);
+		/* wait for any pending NAPI task to complete */
+		napi_disable(&ivec->napi);
+	}
+
+	rtase_hw_reset(dev);
+
+	rtase_tx_clear(tp);
+
+	rtase_rx_clear(tp);
+}
+
 static int rtase_close(struct net_device *dev)
 {
 	struct rtase_private *tp = netdev_priv(dev);
-- 
2.34.1

[PATCH net-next v14 04/13] rtase: Implement the interrupt routine and rtase_poll

[Justin Lai]

1. Implement rtase_interrupt to handle txQ0/rxQ0, txQ4~txQ7 interrupts,
and implement rtase_q_interrupt to handle txQ1/rxQ1, txQ2/rxQ2 and
txQ3/rxQ3 interrupts.
2. Implement rtase_poll to call ring_handler to process the tx or
rx packet of each ring. If the returned value is budget,it means that
there is still work of a certain ring that has not yet been completed.

Signed-off-by: Justin Lai <justinlai0215@realtek.com>
---
 .../net/ethernet/realtek/rtase/rtase_main.c   | 89 +++++++++++++++++++
 1 file changed, 89 insertions(+)

diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c
index a4fe0e0ca721..75488ff17c63 100644
--- a/drivers/net/ethernet/realtek/rtase/rtase_main.c
+++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
@@ -581,6 +581,76 @@ static void rtase_hw_start(const struct net_device *dev)
 	rtase_enable_hw_interrupt(tp);
 }
 
+/*  the interrupt handler does RXQ0 and TXQ0, TXQ4~7 interrutp status
+ */
+static irqreturn_t rtase_interrupt(int irq, void *dev_instance)
+{
+	const struct rtase_private *tp;
+	struct rtase_int_vector *ivec;
+	u32 status;
+
+	ivec = dev_instance;
+	tp = ivec->tp;
+	status = rtase_r32(tp, ivec->isr_addr);
+
+	rtase_w32(tp, ivec->imr_addr, 0x0);
+	rtase_w32(tp, ivec->isr_addr, status & ~FOVW);
+
+	if (napi_schedule_prep(&ivec->napi))
+		__napi_schedule(&ivec->napi);
+
+	return IRQ_HANDLED;
+}
+
+/*  the interrupt handler does RXQ1&TXQ1 or RXQ2&TXQ2 or RXQ3&TXQ3 interrupt
+ *  status according to interrupt vector
+ */
+static irqreturn_t rtase_q_interrupt(int irq, void *dev_instance)
+{
+	const struct rtase_private *tp;
+	struct rtase_int_vector *ivec;
+	u16 status;
+
+	ivec = dev_instance;
+	tp = ivec->tp;
+	status = rtase_r16(tp, ivec->isr_addr);
+
+	rtase_w16(tp, ivec->imr_addr, 0x0);
+	rtase_w16(tp, ivec->isr_addr, status);
+
+	if (napi_schedule_prep(&ivec->napi))
+		__napi_schedule(&ivec->napi);
+
+	return IRQ_HANDLED;
+}
+
+static int rtase_poll(struct napi_struct *napi, int budget)
+{
+	const struct rtase_int_vector *ivec;
+	const struct rtase_private *tp;
+	struct rtase_ring *ring;
+	int total_workdone = 0;
+
+	ivec = container_of(napi, struct rtase_int_vector, napi);
+	tp = ivec->tp;
+
+	list_for_each_entry(ring, &ivec->ring_list, ring_entry) {
+		total_workdone += ring->ring_handler(ring, budget);
+	}
+
+	if (total_workdone >= budget)
+		return budget;
+
+	if (napi_complete_done(napi, total_workdone)) {
+		if (!ivec->index)
+			rtase_w32(tp, ivec->imr_addr, ivec->imr);
+		else
+			rtase_w16(tp, ivec->imr_addr, ivec->imr);
+	}
+
+	return total_workdone;
+}
+
 static int rtase_open(struct net_device *dev)
 {
 	struct rtase_private *tp = netdev_priv(dev);
@@ -729,9 +799,28 @@ static void rtase_rar_set(const struct rtase_private *tp, const u8 *addr)
 	rtase_w16(tp, RTASE_LBK_CTRL, LBK_ATLD | LBK_CLR);
 }
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/* Polling 'interrupt' - used by things like netconsole to send skbs
+ * without having to re-enable interrupts. It's not called while
+ * the interrupt routine is executing.
+ */
+static void rtase_netpoll(struct net_device *dev)
+{
+	const struct rtase_private *tp = netdev_priv(dev);
+	const struct pci_dev *pdev = tp->pdev;
+
+	disable_irq(pdev->irq);
+	rtase_interrupt(pdev->irq, dev);
+	enable_irq(pdev->irq);
+}
+#endif
+
 static const struct net_device_ops rtase_netdev_ops = {
 	.ndo_open = rtase_open,
 	.ndo_stop = rtase_close,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller = rtase_netpoll,
+#endif
 };
 
 static void rtase_get_mac_address(struct net_device *dev)
-- 
2.34.1

[PATCH net-next v14 05/13] rtase: Implement hardware configuration function

[Justin Lai]

Implement rtase_hw_config to set default hardware settings, including
setting interrupt mitigation, tx/rx DMA burst, interframe gap time,
rx packet filter, near fifo threshold and fill descriptor ring and
tally counter address, and enable flow control. When filling the
rx descriptor ring, the first group of queues needs to be processed
separately because the positions of the first group of queues are not
regular with other subsequent groups. The other queues are all newly
added features, but we want to retain the original design. So they were
not put together.

Signed-off-by: Justin Lai <justinlai0215@realtek.com>
---
 .../net/ethernet/realtek/rtase/rtase_main.c   | 228 ++++++++++++++++++
 1 file changed, 228 insertions(+)

diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c
index 75488ff17c63..f6edb0f0a323 100644
--- a/drivers/net/ethernet/realtek/rtase/rtase_main.c
+++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
@@ -465,6 +465,23 @@ static int rtase_init_ring(const struct net_device *dev)
 	return -ENOMEM;
 }
 
+static void rtase_interrupt_mitigation(const struct rtase_private *tp)
+{
+	u32 i;
+
+	for (i = 0; i < tp->func_tx_queue_num; i++)
+		rtase_w16(tp, RTASE_INT_MITI_TX + i * 2, tp->tx_int_mit);
+
+	for (i = 0; i < tp->func_rx_queue_num; i++)
+		rtase_w16(tp, RTASE_INT_MITI_RX + i * 2, tp->rx_int_mit);
+}
+
+static void rtase_tally_counter_addr_fill(const struct rtase_private *tp)
+{
+	rtase_w32(tp, RTASE_DTCCR4, upper_32_bits(tp->tally_paddr));
+	rtase_w32(tp, RTASE_DTCCR0, lower_32_bits(tp->tally_paddr));
+}
+
 static void rtase_tally_counter_clear(const struct rtase_private *tp)
 {
 	u32 cmd = lower_32_bits(tp->tally_paddr);
@@ -473,6 +490,113 @@ static void rtase_tally_counter_clear(const struct rtase_private *tp)
 	rtase_w32(tp, RTASE_DTCCR0, cmd | COUNTER_RESET);
 }
 
+static void rtase_desc_addr_fill(const struct rtase_private *tp)
+{
+	const struct rtase_ring *ring;
+	u16 i, cmd, val;
+	int err;
+
+	for (i = 0; i < tp->func_tx_queue_num; i++) {
+		ring = &tp->tx_ring[i];
+
+		rtase_w32(tp, RTASE_TX_DESC_ADDR0,
+			  lower_32_bits(ring->phy_addr));
+		rtase_w32(tp, RTASE_TX_DESC_ADDR4,
+			  upper_32_bits(ring->phy_addr));
+
+		cmd = i | TX_DESC_CMD_WE | TX_DESC_CMD_CS;
+		rtase_w16(tp, RTASE_TX_DESC_COMMAND, cmd);
+
+		err = read_poll_timeout(rtase_r16, val, !(val & TX_DESC_CMD_CS),
+					10, 1000, false, tp, RTASE_TX_DESC_COMMAND);
+
+		if (err == -ETIMEDOUT)
+			netdev_err(tp->dev, "error occurred in fill tx descriptor\n");
+	}
+
+	for (i = 0; i < tp->func_rx_queue_num; i++) {
+		ring = &tp->rx_ring[i];
+
+		if (i == 0) {
+			rtase_w32(tp, RTASE_Q0_RX_DESC_ADDR0,
+				  lower_32_bits(ring->phy_addr));
+			rtase_w32(tp, RTASE_Q0_RX_DESC_ADDR4,
+				  upper_32_bits(ring->phy_addr));
+		} else {
+			rtase_w32(tp, (RTASE_Q1_RX_DESC_ADDR0 + ((i - 1) * 8)),
+				  lower_32_bits(ring->phy_addr));
+			rtase_w32(tp, (RTASE_Q1_RX_DESC_ADDR4 + ((i - 1) * 8)),
+				  upper_32_bits(ring->phy_addr));
+		}
+	}
+}
+
+static void rtase_hw_set_features(const struct net_device *dev,
+				  netdev_features_t features)
+{
+	const struct rtase_private *tp = netdev_priv(dev);
+	u16 rx_config, val;
+
+	rx_config = rtase_r16(tp, RTASE_RX_CONFIG_0);
+	if (features & NETIF_F_RXALL)
+		rx_config |= (ACCEPT_ERR | ACCEPT_RUNT);
+	else
+		rx_config &= ~(ACCEPT_ERR | ACCEPT_RUNT);
+
+	rtase_w16(tp, RTASE_RX_CONFIG_0, rx_config);
+
+	val = rtase_r16(tp, RTASE_CPLUS_CMD);
+	if (features & NETIF_F_RXCSUM)
+		rtase_w16(tp, RTASE_CPLUS_CMD, val | RX_CHKSUM);
+	else
+		rtase_w16(tp, RTASE_CPLUS_CMD, val & ~RX_CHKSUM);
+
+	rx_config = rtase_r16(tp, RTASE_RX_CONFIG_1);
+	if (dev->features & NETIF_F_HW_VLAN_CTAG_RX)
+		rx_config |= (INNER_VLAN_DETAG_EN | OUTER_VLAN_DETAG_EN);
+	else
+		rx_config &= ~(INNER_VLAN_DETAG_EN | OUTER_VLAN_DETAG_EN);
+
+	rtase_w16(tp, RTASE_RX_CONFIG_1, rx_config);
+}
+
+static void rtase_hw_set_rx_packet_filter(struct net_device *dev)
+{
+	u32 mc_filter[2] = { 0xFFFFFFFF, 0xFFFFFFFF };
+	struct rtase_private *tp = netdev_priv(dev);
+	u16 rx_mode;
+
+	rx_mode = rtase_r16(tp, RTASE_RX_CONFIG_0) & ~ACCEPT_MASK;
+	rx_mode |= ACCEPT_BROADCAST | ACCEPT_MYPHYS;
+
+	if (dev->flags & IFF_PROMISC) {
+		rx_mode |= ACCEPT_MULTICAST | ACCEPT_ALLPHYS;
+	} else if (dev->flags & IFF_ALLMULTI) {
+		rx_mode |= ACCEPT_MULTICAST;
+	} else {
+		struct netdev_hw_addr *hw_addr;
+
+		mc_filter[0] = 0;
+		mc_filter[1] = 0;
+
+		netdev_for_each_mc_addr(hw_addr, dev) {
+			u32 bit_nr = eth_hw_addr_crc(hw_addr);
+			u32 idx = u32_get_bits(bit_nr, BIT(31));
+			u32 bit = u32_get_bits(bit_nr, MULTICAST_FILTER_MASK);
+
+			mc_filter[idx] |= BIT(bit);
+			rx_mode |= ACCEPT_MULTICAST;
+		}
+	}
+
+	if (dev->features & NETIF_F_RXALL)
+		rx_mode |= ACCEPT_ERR | ACCEPT_RUNT;
+
+	rtase_w32(tp, RTASE_MAR0, swab32(mc_filter[1]));
+	rtase_w32(tp, RTASE_MAR1, swab32(mc_filter[0]));
+	rtase_w16(tp, RTASE_RX_CONFIG_0, rx_mode);
+}
+
 static void rtase_irq_dis_and_clear(const struct rtase_private *tp)
 {
 	const struct rtase_int_vector *ivec = &tp->int_vector[0];
@@ -544,6 +668,110 @@ static void rtase_hw_reset(const struct net_device *dev)
 	rtase_nic_reset(dev);
 }
 
+static void rtase_set_rx_queue(const struct rtase_private *tp)
+{
+	u16 reg_data;
+
+	reg_data = rtase_r16(tp, RTASE_FCR);
+	switch (tp->func_rx_queue_num) {
+	case 1:
+		u16p_replace_bits(&reg_data, 0x1, FCR_RXQ_MASK);
+		break;
+	case 2:
+		u16p_replace_bits(&reg_data, 0x2, FCR_RXQ_MASK);
+		break;
+	case 4:
+		u16p_replace_bits(&reg_data, 0x3, FCR_RXQ_MASK);
+		break;
+	}
+	rtase_w16(tp, RTASE_FCR, reg_data);
+}
+
+static void rtase_set_tx_queue(const struct rtase_private *tp)
+{
+	u16 reg_data;
+
+	reg_data = rtase_r16(tp, RTASE_TX_CONFIG_1);
+	switch (tp->tx_queue_ctrl) {
+	case 1:
+		u16p_replace_bits(&reg_data, 0x0, TC_MODE_MASK);
+		break;
+	case 2:
+		u16p_replace_bits(&reg_data, 0x1, TC_MODE_MASK);
+		break;
+	case 3:
+	case 4:
+		u16p_replace_bits(&reg_data, 0x2, TC_MODE_MASK);
+		break;
+	default:
+		u16p_replace_bits(&reg_data, 0x3, TC_MODE_MASK);
+		break;
+	}
+	rtase_w16(tp, RTASE_TX_CONFIG_1, reg_data);
+}
+
+static void rtase_hw_config(struct net_device *dev)
+{
+	const struct rtase_private *tp = netdev_priv(dev);
+	u32 reg_data32;
+	u16 reg_data16;
+
+	rtase_hw_reset(dev);
+
+	/* set rx dma burst */
+	reg_data16 = rtase_r16(tp, RTASE_RX_CONFIG_0);
+	reg_data16 &= ~(RX_SINGLE_TAG | RX_SINGLE_FETCH);
+	u16p_replace_bits(&reg_data16, RX_DMA_BURST_256, RX_MX_DMA_MASK);
+	rtase_w16(tp, RTASE_RX_CONFIG_0, reg_data16);
+
+	/* new rx descritpor */
+	reg_data16 = rtase_r16(tp, RTASE_RX_CONFIG_1);
+	reg_data16 |= RX_NEW_DESC_FORMAT_EN | PCIE_NEW_FLOW;
+	u16p_replace_bits(&reg_data16, 0xF, RX_MAX_FETCH_DESC_MASK);
+	rtase_w16(tp, RTASE_RX_CONFIG_1, reg_data16);
+
+	rtase_set_rx_queue(tp);
+
+	rtase_interrupt_mitigation(tp);
+
+	/* set tx dma burst size and interframe gap time */
+	reg_data32 = rtase_r32(tp, RTASE_TX_CONFIG_0);
+	u32p_replace_bits(&reg_data32, TX_DMA_BURST_UNLIMITED, TX_DMA_MASK);
+	u32p_replace_bits(&reg_data32, INTERFRAMEGAP, TX_INTER_FRAME_GAP_MASK);
+	rtase_w32(tp, RTASE_TX_CONFIG_0, reg_data32);
+
+	/* new tx descriptor */
+	reg_data16 = rtase_r16(tp, RTASE_TFUN_CTRL);
+	rtase_w16(tp, RTASE_TFUN_CTRL, reg_data16 | TX_NEW_DESC_FORMAT_EN);
+
+	/* tx fetch desc number */
+	rtase_w8(tp, RTASE_TDFNR, 0x10);
+
+	/* tag num select */
+	reg_data16 = rtase_r16(tp, RTASE_MTPS);
+	u16p_replace_bits(&reg_data16, 0x4, TAG_NUM_SEL_MASK);
+	rtase_w16(tp, RTASE_MTPS, reg_data16);
+
+	rtase_set_tx_queue(tp);
+
+	rtase_w16(tp, RTASE_TOKSEL, 0x5555);
+
+	rtase_tally_counter_addr_fill(tp);
+	rtase_desc_addr_fill(tp);
+	rtase_hw_set_features(dev, dev->features);
+
+	/* enable flow control */
+	reg_data16 = rtase_r16(tp, RTASE_CPLUS_CMD);
+	reg_data16 |= (FORCE_TXFLOW_EN | FORCE_RXFLOW_EN);
+	rtase_w16(tp, RTASE_CPLUS_CMD, reg_data16);
+	/* set near fifo threshold - rx missed issue. */
+	rtase_w16(tp, RTASE_RFIFONFULL, 0x190);
+
+	rtase_w16(tp, RTASE_RMS, tp->rx_buf_sz);
+
+	rtase_hw_set_rx_packet_filter(dev);
+}
+
 static void rtase_nic_enable(const struct net_device *dev)
 {
 	const struct rtase_private *tp = netdev_priv(dev);
-- 
2.34.1

[PATCH net-next v14 06/13] rtase: Implement .ndo_start_xmit function

[Justin Lai]

Implement .ndo_start_xmit function to fill the information of the packet
to be transmitted into the tx descriptor, and then the hardware will
transmit the packet using the information in the tx descriptor.
In addition, we also implemented the tx_handler function to enable the
tx descriptor to be reused.

Signed-off-by: Justin Lai <justinlai0215@realtek.com>
---
 .../net/ethernet/realtek/rtase/rtase_main.c   | 286 ++++++++++++++++++
 1 file changed, 286 insertions(+)

diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c
index f6edb0f0a323..eee792ea4760 100644
--- a/drivers/net/ethernet/realtek/rtase/rtase_main.c
+++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
@@ -251,6 +251,68 @@ static void rtase_mark_to_asic(union rx_desc *desc, u32 rx_buf_sz)
 		   cpu_to_le32(DESC_OWN | eor | rx_buf_sz));
 }
 
+static bool rtase_tx_avail(struct rtase_ring *ring)
+{
+	u32 avail_num = READ_ONCE(ring->dirty_idx) + NUM_DESC -
+			READ_ONCE(ring->cur_idx);
+
+	return avail_num > MAX_SKB_FRAGS;
+}
+
+static int tx_handler(struct rtase_ring *ring, int budget)
+{
+	const struct rtase_private *tp = ring->ivec->tp;
+	struct net_device *dev = tp->dev;
+	int workdone = 0;
+	u32 dirty_tx;
+	u32 tx_left;
+
+	dirty_tx = ring->dirty_idx;
+	tx_left = READ_ONCE(ring->cur_idx) - dirty_tx;
+
+	while (tx_left > 0) {
+		u32 entry = dirty_tx % NUM_DESC;
+		struct tx_desc *desc = ring->desc +
+				       sizeof(struct tx_desc) * entry;
+		u32 len = ring->mis.len[entry];
+		u32 status;
+
+		status = le32_to_cpu(desc->opts1);
+
+		if (status & DESC_OWN)
+			break;
+
+		rtase_unmap_tx_skb(tp->pdev, len, desc);
+		ring->mis.len[entry] = 0;
+		if (ring->skbuff[entry]) {
+			dev_consume_skb_any(ring->skbuff[entry]);
+			ring->skbuff[entry] = NULL;
+		}
+
+		dev->stats.tx_bytes += len;
+		dev->stats.tx_packets++;
+		dirty_tx++;
+		tx_left--;
+		workdone++;
+
+		if (workdone == budget)
+			break;
+	}
+
+	if (ring->dirty_idx != dirty_tx) {
+		WRITE_ONCE(ring->dirty_idx, dirty_tx);
+
+		if (__netif_subqueue_stopped(dev, ring->index) &&
+		    rtase_tx_avail(ring))
+			netif_start_subqueue(dev, ring->index);
+
+		if (ring->cur_idx != dirty_tx)
+			rtase_w8(tp, RTASE_TPPOLL, BIT(ring->index));
+	}
+
+	return workdone;
+}
+
 static void rtase_tx_desc_init(struct rtase_private *tp, u16 idx)
 {
 	struct rtase_ring *ring = &tp->tx_ring[idx];
@@ -995,6 +1057,229 @@ static int rtase_close(struct net_device *dev)
 	return 0;
 }
 
+static u32 rtase_tx_vlan_tag(const struct rtase_private *tp,
+			     const struct sk_buff *skb)
+{
+	return (skb_vlan_tag_present(skb)) ?
+		(TX_VLAN_TAG | swab16(skb_vlan_tag_get(skb))) : 0x00;
+}
+
+static u32 rtase_tx_csum(struct sk_buff *skb, const struct net_device *dev)
+{
+	u32 csum_cmd = 0;
+	u8 ip_protocol;
+
+	switch (vlan_get_protocol(skb)) {
+	case htons(ETH_P_IP):
+		csum_cmd = TX_IPCS_C;
+		ip_protocol = ip_hdr(skb)->protocol;
+		break;
+
+	case htons(ETH_P_IPV6):
+		csum_cmd = TX_IPV6F_C;
+		ip_protocol = ipv6_hdr(skb)->nexthdr;
+		break;
+
+	default:
+		ip_protocol = IPPROTO_RAW;
+		break;
+	}
+
+	if (ip_protocol == IPPROTO_TCP)
+		csum_cmd |= TX_TCPCS_C;
+	else if (ip_protocol == IPPROTO_UDP)
+		csum_cmd |= TX_UDPCS_C;
+	else
+		WARN_ON_ONCE(1);
+
+	csum_cmd |= u32_encode_bits(skb_transport_offset(skb), TCPHO_MASK);
+
+	return csum_cmd;
+}
+
+static int rtase_xmit_frags(struct rtase_ring *ring, struct sk_buff *skb,
+			    u32 opts1, u32 opts2)
+{
+	const struct skb_shared_info *info = skb_shinfo(skb);
+	const struct rtase_private *tp = ring->ivec->tp;
+	const u8 nr_frags = info->nr_frags;
+	struct tx_desc *txd = NULL;
+	u32 cur_frag, entry;
+
+	entry = ring->cur_idx;
+	for (cur_frag = 0; cur_frag < nr_frags; cur_frag++) {
+		const skb_frag_t *frag = &info->frags[cur_frag];
+		dma_addr_t mapping;
+		u32 status, len;
+		void *addr;
+
+		entry = (entry + 1) % NUM_DESC;
+
+		txd = ring->desc + sizeof(struct tx_desc) * entry;
+		len = skb_frag_size(frag);
+		addr = skb_frag_address(frag);
+		mapping = dma_map_single(&tp->pdev->dev, addr, len,
+					 DMA_TO_DEVICE);
+
+		if (unlikely(dma_mapping_error(&tp->pdev->dev, mapping))) {
+			if (unlikely(net_ratelimit()))
+				netdev_err(tp->dev,
+					   "Failed to map TX fragments DMA!\n");
+
+			goto err_out;
+		}
+
+		if (((entry + 1) % NUM_DESC) == 0)
+			status = (opts1 | len | RING_END);
+		else
+			status = opts1 | len;
+
+		if (cur_frag == (nr_frags - 1)) {
+			ring->skbuff[entry] = skb;
+			status |= TX_LAST_FRAG;
+		}
+
+		ring->mis.len[entry] = len;
+		txd->addr = cpu_to_le64(mapping);
+		txd->opts2 = cpu_to_le32(opts2);
+
+		/* make sure the operating fields have been updated */
+		wmb();
+		txd->opts1 = cpu_to_le32(status);
+	}
+
+	return cur_frag;
+
+err_out:
+	rtase_tx_clear_range(ring, ring->cur_idx + 1, cur_frag);
+	return -EIO;
+}
+
+static netdev_tx_t rtase_start_xmit(struct sk_buff *skb,
+				    struct net_device *dev)
+{
+	struct skb_shared_info *shinfo = skb_shinfo(skb);
+	struct rtase_private *tp = netdev_priv(dev);
+	u32 q_idx, entry, len, opts1, opts2;
+	u32 mss = shinfo->gso_size;
+	struct rtase_ring *ring;
+	struct tx_desc *txd;
+	dma_addr_t mapping;
+	bool stop_queue;
+	int frags;
+
+	/* multiqueues */
+	q_idx = skb_get_queue_mapping(skb);
+	ring = &tp->tx_ring[q_idx];
+
+	if (unlikely(!rtase_tx_avail(ring))) {
+		if (net_ratelimit())
+			netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
+		goto err_stop;
+	}
+
+	entry = ring->cur_idx % NUM_DESC;
+	txd = ring->desc + sizeof(struct tx_desc) * entry;
+
+	opts1 = DESC_OWN;
+	opts2 = rtase_tx_vlan_tag(tp, skb);
+
+	/* tcp segmentation offload (or tcp large send) */
+	if (mss) {
+		if (shinfo->gso_type & SKB_GSO_TCPV4) {
+			opts1 |= GIANT_SEND_V4;
+		} else if (shinfo->gso_type & SKB_GSO_TCPV6) {
+			if (skb_cow_head(skb, 0))
+				goto err_dma_0;
+
+			tcp_v6_gso_csum_prep(skb);
+			opts1 |= GIANT_SEND_V6;
+		} else {
+			WARN_ON_ONCE(1);
+		}
+
+		opts1 |= u32_encode_bits(skb_transport_offset(skb), TCPHO_MASK);
+		opts2 |= u32_encode_bits(mss, MSS_MASK);
+	} else if (skb->ip_summed == CHECKSUM_PARTIAL) {
+		opts2 |= rtase_tx_csum(skb, dev);
+	}
+
+	frags = rtase_xmit_frags(ring, skb, opts1, opts2);
+	if (unlikely(frags < 0))
+		goto err_dma_0;
+
+	if (frags) {
+		len = skb_headlen(skb);
+		opts1 |= TX_FIRST_FRAG;
+	} else {
+		len = skb->len;
+		ring->skbuff[entry] = skb;
+		opts1 |= TX_FIRST_FRAG | TX_LAST_FRAG;
+	}
+
+	if (((entry + 1) % NUM_DESC) == 0)
+		opts1 |= (len | RING_END);
+	else
+		opts1 |= len;
+
+	mapping = dma_map_single(&tp->pdev->dev, skb->data, len,
+				 DMA_TO_DEVICE);
+
+	if (unlikely(dma_mapping_error(&tp->pdev->dev, mapping))) {
+		if (unlikely(net_ratelimit()))
+			netdev_err(dev, "Failed to map TX DMA!\n");
+
+		goto err_dma_1;
+	}
+
+	ring->mis.len[entry] = len;
+	txd->addr = cpu_to_le64(mapping);
+	txd->opts2 = cpu_to_le32(opts2);
+	txd->opts1 = cpu_to_le32(opts1 & ~DESC_OWN);
+
+	/* make sure the operating fields have been updated */
+	wmb();
+
+	txd->opts1 = cpu_to_le32(opts1);
+
+	skb_tx_timestamp(skb);
+
+	/* tx needs to see descriptor changes before updated cur_idx */
+	smp_wmb();
+
+	WRITE_ONCE(ring->cur_idx, ring->cur_idx + frags + 1);
+
+	stop_queue = !rtase_tx_avail(ring);
+	if (unlikely(stop_queue))
+		netif_stop_subqueue(dev, q_idx);
+
+	/* set polling bit */
+	rtase_w8(tp, RTASE_TPPOLL, BIT(ring->index));
+
+	if (unlikely(stop_queue)) {
+		/* make sure cur_idx and dirty_idx have been updated */
+		smp_rmb();
+		if (rtase_tx_avail(ring))
+			netif_start_subqueue(dev, q_idx);
+	}
+
+	return NETDEV_TX_OK;
+
+err_dma_1:
+	ring->skbuff[entry] = NULL;
+	rtase_tx_clear_range(ring, ring->cur_idx + 1, frags);
+
+err_dma_0:
+	dev->stats.tx_dropped++;
+	dev_kfree_skb_any(skb);
+	return NETDEV_TX_OK;
+
+err_stop:
+	netif_stop_queue(dev);
+	dev->stats.tx_dropped++;
+	return NETDEV_TX_BUSY;
+}
+
 static void rtase_enable_eem_write(const struct rtase_private *tp)
 {
 	u8 val;
@@ -1046,6 +1331,7 @@ static void rtase_netpoll(struct net_device *dev)
 static const struct net_device_ops rtase_netdev_ops = {
 	.ndo_open = rtase_open,
 	.ndo_stop = rtase_close,
+	.ndo_start_xmit = rtase_start_xmit,
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_poll_controller = rtase_netpoll,
 #endif
-- 
2.34.1

[PATCH net-next v14 07/13] rtase: Implement a function to receive packets

[Justin Lai]

Implement rx_handler to read the information of the rx descriptor,
thereby checking the packet accordingly and storing the packet
in the socket buffer to complete the reception of the packet.

Signed-off-by: Justin Lai <justinlai0215@realtek.com>
---
 .../net/ethernet/realtek/rtase/rtase_main.c   | 148 ++++++++++++++++++
 1 file changed, 148 insertions(+)

diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c
index eee792ea4760..83a119389110 100644
--- a/drivers/net/ethernet/realtek/rtase/rtase_main.c
+++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
@@ -451,6 +451,154 @@ static void rtase_rx_ring_clear(struct rtase_ring *ring)
 	}
 }
 
+static int rtase_fragmented_frame(u32 status)
+{
+	return (status & (RX_FIRST_FRAG | RX_LAST_FRAG)) !=
+		(RX_FIRST_FRAG | RX_LAST_FRAG);
+}
+
+static void rtase_rx_csum(const struct rtase_private *tp, struct sk_buff *skb,
+			  const union rx_desc *desc)
+{
+	u32 opts2 = le32_to_cpu(desc->desc_status.opts2);
+
+	/* rx csum offload */
+	if (((opts2 & RX_V4F) && !(opts2 & RX_IPF)) || (opts2 & RX_V6F)) {
+		if (((opts2 & RX_TCPT) && !(opts2 & RX_TCPF)) ||
+		    ((opts2 & RX_UDPT) && !(opts2 & RX_UDPF))) {
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+		} else {
+			skb->ip_summed = CHECKSUM_NONE;
+		}
+	} else {
+		skb->ip_summed = CHECKSUM_NONE;
+	}
+}
+
+static void rtase_rx_vlan_skb(union rx_desc *desc, struct sk_buff *skb)
+{
+	u32 opts2 = le32_to_cpu(desc->desc_status.opts2);
+
+	if (!(opts2 & RX_VLAN_TAG))
+		return;
+
+	__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), swab16(opts2 & VLAN_TAG_MASK));
+}
+
+static void rtase_rx_skb(const struct rtase_ring *ring, struct sk_buff *skb)
+{
+	struct rtase_int_vector *ivec = ring->ivec;
+
+	napi_gro_receive(&ivec->napi, skb);
+}
+
+static int rx_handler(struct rtase_ring *ring, int budget)
+{
+	const struct rtase_private *tp = ring->ivec->tp;
+	u32 pkt_size, cur_rx, delta, entry, status;
+	union rx_desc *desc_base = ring->desc;
+	struct net_device *dev = tp->dev;
+	struct sk_buff *skb;
+	union rx_desc *desc;
+	int workdone = 0;
+
+	if (!ring->desc)
+		return workdone;
+
+	cur_rx = ring->cur_idx;
+	entry = cur_rx % NUM_DESC;
+	desc = &desc_base[entry];
+
+	do {
+		/* make sure discriptor has been updated */
+		rmb();
+		status = le32_to_cpu(desc->desc_status.opts1);
+
+		if (status & DESC_OWN)
+			break;
+
+		if (unlikely(status & RX_RES)) {
+			if (net_ratelimit())
+				netdev_warn(dev, "Rx ERROR. status = %08x\n",
+					    status);
+
+			dev->stats.rx_errors++;
+
+			if (status & (RX_RWT | RX_RUNT))
+				dev->stats.rx_length_errors++;
+
+			if (status & RX_CRC)
+				dev->stats.rx_crc_errors++;
+
+			if (dev->features & NETIF_F_RXALL)
+				goto process_pkt;
+
+			rtase_mark_to_asic(desc, tp->rx_buf_sz);
+			goto skip_process_pkt;
+		}
+
+process_pkt:
+		pkt_size = status & RX_PKT_SIZE_MASK;
+		if (likely(!(dev->features & NETIF_F_RXFCS)))
+			pkt_size -= ETH_FCS_LEN;
+
+		/* the driver does not support incoming fragmented
+		 * frames. they are seen as a symptom of over-mtu
+		 * sized frames
+		 */
+		if (unlikely(rtase_fragmented_frame(status))) {
+			dev->stats.rx_dropped++;
+			dev->stats.rx_length_errors++;
+			rtase_mark_to_asic(desc, tp->rx_buf_sz);
+			continue;
+		}
+
+		skb = ring->skbuff[entry];
+		dma_sync_single_for_cpu(&tp->pdev->dev,
+					ring->mis.data_phy_addr[entry],
+					tp->rx_buf_sz, DMA_FROM_DEVICE);
+
+		ring->skbuff[entry] = NULL;
+
+		if (dev->features & NETIF_F_RXCSUM)
+			rtase_rx_csum(tp, skb, desc);
+
+		skb->dev = dev;
+		skb_put(skb, pkt_size);
+		skb_mark_for_recycle(skb);
+		skb->protocol = eth_type_trans(skb, dev);
+
+		if (skb->pkt_type == PACKET_MULTICAST)
+			dev->stats.multicast++;
+
+		rtase_rx_vlan_skb(desc, skb);
+		rtase_rx_skb(ring, skb);
+
+		dev->stats.rx_bytes += pkt_size;
+		dev->stats.rx_packets++;
+
+skip_process_pkt:
+		workdone++;
+		cur_rx++;
+		entry = cur_rx % NUM_DESC;
+		desc = ring->desc + sizeof(union rx_desc) * entry;
+		prefetch(desc);
+	} while (workdone != budget);
+
+	ring->cur_idx = cur_rx;
+	delta = rtase_rx_ring_fill(ring, ring->dirty_idx, ring->cur_idx, 1);
+
+	if (!delta && workdone)
+		netdev_info(dev, "no Rx buffer allocated\n");
+
+	ring->dirty_idx += delta;
+
+	if ((ring->dirty_idx + NUM_DESC) == ring->cur_idx)
+		netdev_emerg(dev, "Rx buffers exhausted\n");
+
+	return workdone;
+}
+
 static void rtase_rx_desc_init(struct rtase_private *tp, u16 idx)
 {
 	struct rtase_ring *ring = &tp->rx_ring[idx];
-- 
2.34.1

[PATCH net-next v14 08/13] rtase: Implement net_device_ops

[Justin Lai]

1. Implement .ndo_set_rx_mode so that the device can change address
list filtering.
2. Implement .ndo_set_mac_address so that mac address can be changed.
3. Implement .ndo_change_mtu so that mtu can be changed.
4. Implement .ndo_tx_timeout to perform related processing when the
transmitter does not make any progress.
5. Implement .ndo_get_stats64 to provide statistics that are called
when the user wants to get network device usage.
6. Implement .ndo_vlan_rx_add_vid to register VLAN ID when the device
supports VLAN filtering.
7. Implement .ndo_vlan_rx_kill_vid to unregister VLAN ID when the device
supports VLAN filtering.
8. Implement the .ndo_setup_tc to enable setting any "tc" scheduler,
classifier or action on dev.
9. Implement .ndo_fix_features enables adjusting requested feature flags
based on device-specific constraints.
10. Implement .ndo_set_features enables updating device configuration to
new features.

Signed-off-by: Justin Lai <justinlai0215@realtek.com>
---
 .../net/ethernet/realtek/rtase/rtase_main.c   | 237 ++++++++++++++++++
 1 file changed, 237 insertions(+)

diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c
index 83a119389110..98e714d4874a 100644
--- a/drivers/net/ethernet/realtek/rtase/rtase_main.c
+++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
@@ -1428,6 +1428,11 @@ static netdev_tx_t rtase_start_xmit(struct sk_buff *skb,
 	return NETDEV_TX_BUSY;
 }
 
+static void rtase_set_rx_mode(struct net_device *dev)
+{
+	rtase_hw_set_rx_packet_filter(dev);
+}
+
 static void rtase_enable_eem_write(const struct rtase_private *tp)
 {
 	u8 val;
@@ -1460,6 +1465,203 @@ static void rtase_rar_set(const struct rtase_private *tp, const u8 *addr)
 	rtase_w16(tp, RTASE_LBK_CTRL, LBK_ATLD | LBK_CLR);
 }
 
+static int rtase_set_mac_address(struct net_device *dev, void *p)
+{
+	struct rtase_private *tp = netdev_priv(dev);
+	int ret;
+
+	ret = eth_mac_addr(dev, p);
+	if (ret)
+		return ret;
+
+	rtase_rar_set(tp, dev->dev_addr);
+
+	return 0;
+}
+
+static int rtase_change_mtu(struct net_device *dev, int new_mtu)
+{
+	dev->mtu = new_mtu;
+
+	netdev_update_features(dev);
+
+	return 0;
+}
+
+static void rtase_wait_for_quiescence(const struct net_device *dev)
+{
+	struct rtase_private *tp = netdev_priv(dev);
+	struct rtase_int_vector *ivec;
+	u32 i;
+
+	for (i = 0; i < tp->int_nums; i++) {
+		ivec = &tp->int_vector[i];
+		synchronize_irq(ivec->irq);
+		/* wait for any pending NAPI task to complete */
+		napi_disable(&ivec->napi);
+	}
+
+	rtase_irq_dis_and_clear(tp);
+
+	for (i = 0; i < tp->int_nums; i++) {
+		ivec = &tp->int_vector[i];
+		napi_enable(&ivec->napi);
+	}
+}
+
+static void rtase_sw_reset(struct net_device *dev)
+{
+	struct rtase_private *tp = netdev_priv(dev);
+	int ret;
+
+	netif_stop_queue(dev);
+	netif_carrier_off(dev);
+	rtase_hw_reset(dev);
+
+	/* let's wait a bit while any (async) irq lands on */
+	rtase_wait_for_quiescence(dev);
+	rtase_tx_clear(tp);
+	rtase_rx_clear(tp);
+
+	ret = rtase_init_ring(dev);
+	if (ret) {
+		netdev_err(dev, "unable to init ring\n");
+		rtase_free_desc(tp);
+		return;
+	}
+
+	rtase_hw_config(dev);
+	/* always link, so start to transmit & receive */
+	rtase_hw_start(dev);
+
+	netif_carrier_on(dev);
+	netif_wake_queue(dev);
+}
+
+static void rtase_dump_tally_counter(const struct rtase_private *tp)
+{
+	dma_addr_t paddr = tp->tally_paddr;
+	u32 cmd = lower_32_bits(paddr);
+	u32 val;
+	int err;
+
+	rtase_w32(tp, RTASE_DTCCR4, upper_32_bits(paddr));
+	rtase_w32(tp, RTASE_DTCCR0, cmd);
+	rtase_w32(tp, RTASE_DTCCR0, cmd | COUNTER_DUMP);
+
+	err = read_poll_timeout(rtase_r32, val, !(val & COUNTER_DUMP), 10, 250,
+				false, tp, RTASE_DTCCR0);
+
+	if (err == -ETIMEDOUT)
+		netdev_err(tp->dev, "error occurred in dump tally counter\n");
+}
+
+static void rtase_dump_state(const struct net_device *dev)
+{
+	const struct rtase_private *tp = netdev_priv(dev);
+	int max_reg_size = RTASE_PCI_REGS_SIZE;
+	const struct rtase_counters *counters;
+	const struct rtase_ring *ring;
+	u32 dword_rd;
+	int n = 0;
+
+	ring = &tp->tx_ring[0];
+	netdev_err(dev, "Tx descriptor info:\n");
+	netdev_err(dev, "Tx curIdx = 0x%x\n", ring->cur_idx);
+	netdev_err(dev, "Tx dirtyIdx = 0x%x\n", ring->dirty_idx);
+	netdev_err(dev, "Tx phyAddr = %pad\n", &ring->phy_addr);
+
+	ring = &tp->rx_ring[0];
+	netdev_err(dev, "Rx descriptor info:\n");
+	netdev_err(dev, "Rx curIdx = 0x%x\n", ring->cur_idx);
+	netdev_err(dev, "Rx dirtyIdx = 0x%x\n", ring->dirty_idx);
+	netdev_err(dev, "Rx phyAddr = %pad\n", &ring->phy_addr);
+
+	netdev_err(dev, "Device Registers:\n");
+	netdev_err(dev, "Chip Command = 0x%02x\n", rtase_r8(tp, RTASE_CHIP_CMD));
+	netdev_err(dev, "IMR = %08x\n", rtase_r32(tp, RTASE_IMR0));
+	netdev_err(dev, "ISR = %08x\n", rtase_r32(tp, RTASE_ISR0));
+	netdev_err(dev, "Boot Ctrl Reg(0xE004) = %04x\n",
+		   rtase_r16(tp, RTASE_BOOT_CTL));
+	netdev_err(dev, "EPHY ISR(0xE014) = %04x\n",
+		   rtase_r16(tp, RTASE_EPHY_ISR));
+	netdev_err(dev, "EPHY IMR(0xE016) = %04x\n",
+		   rtase_r16(tp, RTASE_EPHY_IMR));
+	netdev_err(dev, "CLKSW SET REG(0xE018) = %04x\n",
+		   rtase_r16(tp, RTASE_CLKSW_SET));
+
+	netdev_err(dev, "Dump PCI Registers:\n");
+
+	while (n < max_reg_size) {
+		if ((n % RTASE_DWORD_MOD) == 0)
+			netdev_err(tp->dev, "0x%03x:\n", n);
+
+		pci_read_config_dword(tp->pdev, n, &dword_rd);
+		netdev_err(tp->dev, "%08x\n", dword_rd);
+		n += 4;
+	}
+
+	netdev_err(dev, "Dump tally counter:\n");
+	counters = tp->tally_vaddr;
+	rtase_dump_tally_counter(tp);
+
+	netdev_err(dev, "tx_packets %lld\n",
+		   le64_to_cpu(counters->tx_packets));
+	netdev_err(dev, "rx_packets %lld\n",
+		   le64_to_cpu(counters->rx_packets));
+	netdev_err(dev, "tx_errors %lld\n",
+		   le64_to_cpu(counters->tx_errors));
+	netdev_err(dev, "rx_errors %d\n",
+		   le32_to_cpu(counters->rx_errors));
+	netdev_err(dev, "rx_missed %d\n",
+		   le16_to_cpu(counters->rx_missed));
+	netdev_err(dev, "align_errors %d\n",
+		   le16_to_cpu(counters->align_errors));
+	netdev_err(dev, "tx_one_collision %d\n",
+		   le32_to_cpu(counters->tx_one_collision));
+	netdev_err(dev, "tx_multi_collision %d\n",
+		   le32_to_cpu(counters->tx_multi_collision));
+	netdev_err(dev, "rx_unicast %lld\n",
+		   le64_to_cpu(counters->rx_unicast));
+	netdev_err(dev, "rx_broadcast %lld\n",
+		   le64_to_cpu(counters->rx_broadcast));
+	netdev_err(dev, "rx_multicast %d\n",
+		   le32_to_cpu(counters->rx_multicast));
+	netdev_err(dev, "tx_aborted %d\n",
+		   le16_to_cpu(counters->tx_aborted));
+	netdev_err(dev, "tx_underun %d\n",
+		   le16_to_cpu(counters->tx_underun));
+}
+
+static void rtase_tx_timeout(struct net_device *dev, unsigned int txqueue)
+{
+	rtase_dump_state(dev);
+	rtase_sw_reset(dev);
+}
+
+static void rtase_get_stats64(struct net_device *dev,
+			      struct rtnl_link_stats64 *stats)
+{
+	const struct rtase_private *tp = netdev_priv(dev);
+	const struct rtase_counters *counters = tp->tally_vaddr;
+
+	if (!counters)
+		return;
+
+	netdev_stats_to_stats64(stats, &dev->stats);
+	dev_fetch_sw_netstats(stats, dev->tstats);
+
+	/* fetch additional counter values missing in stats collected by driver
+	 * from tally counter
+	 */
+	rtase_dump_tally_counter(tp);
+
+	stats->tx_errors = le64_to_cpu(counters->tx_errors);
+	stats->collisions = le32_to_cpu(counters->tx_multi_collision);
+	stats->tx_aborted_errors = le16_to_cpu(counters->tx_aborted);
+	stats->rx_missed_errors = le16_to_cpu(counters->rx_missed);
+}
+
 #ifdef CONFIG_NET_POLL_CONTROLLER
 /* Polling 'interrupt' - used by things like netconsole to send skbs
  * without having to re-enable interrupts. It's not called while
@@ -1476,13 +1678,48 @@ static void rtase_netpoll(struct net_device *dev)
 }
 #endif
 
+static netdev_features_t rtase_fix_features(struct net_device *dev,
+					    netdev_features_t features)
+{
+	netdev_features_t features_fix = features;
+
+	if (dev->mtu > MSS_MAX)
+		features_fix &= ~NETIF_F_ALL_TSO;
+
+	if (dev->mtu > ETH_DATA_LEN)
+		features_fix &= ~NETIF_F_ALL_TSO;
+
+	return features_fix;
+}
+
+static int rtase_set_features(struct net_device *dev,
+			      netdev_features_t features)
+{
+	netdev_features_t features_set = features;
+
+	features_set &= NETIF_F_RXALL | NETIF_F_RXCSUM |
+			NETIF_F_HW_VLAN_CTAG_RX;
+
+	if (features_set ^ dev->features)
+		rtase_hw_set_features(dev, features_set);
+
+	return 0;
+}
+
 static const struct net_device_ops rtase_netdev_ops = {
 	.ndo_open = rtase_open,
 	.ndo_stop = rtase_close,
 	.ndo_start_xmit = rtase_start_xmit,
+	.ndo_set_rx_mode = rtase_set_rx_mode,
+	.ndo_set_mac_address = rtase_set_mac_address,
+	.ndo_change_mtu = rtase_change_mtu,
+	.ndo_tx_timeout = rtase_tx_timeout,
+	.ndo_get_stats64 = rtase_get_stats64,
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_poll_controller = rtase_netpoll,
 #endif
+	.ndo_fix_features = rtase_fix_features,
+	.ndo_set_features = rtase_set_features,
 };
 
 static void rtase_get_mac_address(struct net_device *dev)
-- 
2.34.1

[PATCH net-next v14 09/13] rtase: Implement pci_driver suspend and resume function

[Justin Lai]

Implement the pci_driver suspend function to enable the device
to sleep, and implement the resume function to enable the device
to resume operation.

Signed-off-by: Justin Lai <justinlai0215@realtek.com>
---
 .../net/ethernet/realtek/rtase/rtase_main.c   | 53 +++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c
index 98e714d4874a..1f71ed89e043 100644
--- a/drivers/net/ethernet/realtek/rtase/rtase_main.c
+++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
@@ -2164,12 +2164,65 @@ static void rtase_shutdown(struct pci_dev *pdev)
 	rtase_reset_interrupt(pdev, tp);
 }
 
+static int rtase_suspend(struct device *device)
+{
+	struct net_device *dev = dev_get_drvdata(device);
+
+	if (netif_running(dev)) {
+		netif_stop_queue(dev);
+		netif_device_detach(dev);
+		rtase_hw_reset(dev);
+	}
+
+	return 0;
+}
+
+static int rtase_resume(struct device *device)
+{
+	struct net_device *dev = dev_get_drvdata(device);
+	struct rtase_private *tp = netdev_priv(dev);
+	int ret;
+
+	/* restore last modified mac address */
+	rtase_rar_set(tp, dev->dev_addr);
+
+	if (!netif_running(dev))
+		goto out;
+
+	rtase_wait_for_quiescence(dev);
+
+	rtase_tx_clear(tp);
+	rtase_rx_clear(tp);
+
+	ret = rtase_init_ring(dev);
+	if (ret) {
+		netdev_err(dev, "unable to init ring\n");
+		rtase_free_desc(tp);
+		return -ENOMEM;
+	}
+
+	rtase_hw_config(dev);
+	/* always link, so start to transmit & receive */
+	rtase_hw_start(dev);
+
+	netif_wake_queue(dev);
+	netif_device_attach(dev);
+out:
+
+	return 0;
+}
+
+static const struct dev_pm_ops rtase_pm_ops = {
+	SYSTEM_SLEEP_PM_OPS(rtase_suspend, rtase_resume)
+};
+
 static struct pci_driver rtase_pci_driver = {
 	.name = KBUILD_MODNAME,
 	.id_table = rtase_pci_tbl,
 	.probe = rtase_init_one,
 	.remove = rtase_remove_one,
 	.shutdown = rtase_shutdown,
+	.driver.pm = pm_ptr(&rtase_pm_ops),
 };
 
 module_pci_driver(rtase_pci_driver);
-- 
2.34.1

[PATCH net-next v14 10/13] rtase: Implement ethtool function

[Justin Lai]

Implement the ethtool function to support users to obtain network card
information, including obtaining various device settings, Report whether
physical link is up, Report pause parameters, Set pause parameters,
Return a set of strings that describe the requested objects, Get number
of strings that @get_strings will write, Return extended statistics
about the device.

Signed-off-by: Justin Lai <justinlai0215@realtek.com>
---
 .../net/ethernet/realtek/rtase/rtase_main.c   | 144 ++++++++++++++++++
 1 file changed, 144 insertions(+)

diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c
index 1f71ed89e043..c3a9a1e65ac3 100644
--- a/drivers/net/ethernet/realtek/rtase/rtase_main.c
+++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
@@ -1742,9 +1742,153 @@ static void rtase_get_mac_address(struct net_device *dev)
 	rtase_rar_set(tp, dev->dev_addr);
 }
 
+static void rtase_get_drvinfo(struct net_device *dev,
+			      struct ethtool_drvinfo *drvinfo)
+{
+	const struct rtase_private *tp = netdev_priv(dev);
+
+	strscpy(drvinfo->driver, KBUILD_MODNAME, 32);
+	strscpy(drvinfo->bus_info, pci_name(tp->pdev), 32);
+}
+
+static int rtase_get_settings(struct net_device *dev,
+			      struct ethtool_link_ksettings *cmd)
+{
+	u32 supported = SUPPORTED_MII | SUPPORTED_Pause | SUPPORTED_Asym_Pause;
+
+	ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
+						supported);
+	cmd->base.speed = SPEED_5000;
+	cmd->base.duplex = DUPLEX_FULL;
+	cmd->base.port = PORT_MII;
+	cmd->base.autoneg = AUTONEG_DISABLE;
+
+	return 0;
+}
+
+static void rtase_get_pauseparam(struct net_device *dev,
+				 struct ethtool_pauseparam *pause)
+{
+	const struct rtase_private *tp = netdev_priv(dev);
+	u16 value = rtase_r16(tp, RTASE_CPLUS_CMD);
+
+	pause->autoneg = AUTONEG_DISABLE;
+
+	if ((value & (FORCE_TXFLOW_EN | FORCE_RXFLOW_EN)) ==
+	    (FORCE_TXFLOW_EN | FORCE_RXFLOW_EN)) {
+		pause->rx_pause = 1;
+		pause->tx_pause = 1;
+	} else if ((value & FORCE_TXFLOW_EN)) {
+		pause->tx_pause = 1;
+	} else if ((value & FORCE_RXFLOW_EN)) {
+		pause->rx_pause = 1;
+	}
+}
+
+static int rtase_set_pauseparam(struct net_device *dev,
+				struct ethtool_pauseparam *pause)
+{
+	const struct rtase_private *tp = netdev_priv(dev);
+	u16 value = rtase_r16(tp, RTASE_CPLUS_CMD);
+
+	if (pause->autoneg)
+		return -EOPNOTSUPP;
+
+	value &= ~(FORCE_TXFLOW_EN | FORCE_RXFLOW_EN);
+
+	if (pause->tx_pause)
+		value |= FORCE_TXFLOW_EN;
+
+	if (pause->rx_pause)
+		value |= FORCE_RXFLOW_EN;
+
+	rtase_w16(tp, RTASE_CPLUS_CMD, value);
+	return 0;
+}
+
+static const char rtase_gstrings[][ETH_GSTRING_LEN] = {
+	"tx_packets",
+	"rx_packets",
+	"tx_errors",
+	"rx_errors",
+	"rx_missed",
+	"align_errors",
+	"tx_single_collisions",
+	"tx_multi_collisions",
+	"unicast",
+	"broadcast",
+	"multicast",
+	"tx_aborted",
+	"tx_underrun",
+};
+
+static void rtase_get_strings(struct net_device *dev, u32 stringset, u8 *data)
+{
+	switch (stringset) {
+	case ETH_SS_STATS:
+		memcpy(data, rtase_gstrings, sizeof(rtase_gstrings));
+		break;
+	}
+}
+
+static int rtase_get_sset_count(struct net_device *dev, int sset)
+{
+	int ret = -EOPNOTSUPP;
+
+	switch (sset) {
+	case ETH_SS_STATS:
+		ret = ARRAY_SIZE(rtase_gstrings);
+		break;
+	}
+
+	return ret;
+}
+
+static void rtase_get_ethtool_stats(struct net_device *dev,
+				    struct ethtool_stats *stats, u64 *data)
+{
+	struct rtase_private *tp = netdev_priv(dev);
+	const struct rtase_counters *counters;
+
+	ASSERT_RTNL();
+
+	counters = tp->tally_vaddr;
+	if (!counters)
+		return;
+
+	rtase_dump_tally_counter(tp);
+
+	data[0] = le64_to_cpu(counters->tx_packets);
+	data[1] = le64_to_cpu(counters->rx_packets);
+	data[2] = le64_to_cpu(counters->tx_errors);
+	data[3] = le32_to_cpu(counters->rx_errors);
+	data[4] = le16_to_cpu(counters->rx_missed);
+	data[5] = le16_to_cpu(counters->align_errors);
+	data[6] = le32_to_cpu(counters->tx_one_collision);
+	data[7] = le32_to_cpu(counters->tx_multi_collision);
+	data[8] = le64_to_cpu(counters->rx_unicast);
+	data[9] = le64_to_cpu(counters->rx_broadcast);
+	data[10] = le32_to_cpu(counters->rx_multicast);
+	data[11] = le16_to_cpu(counters->tx_aborted);
+	data[12] = le16_to_cpu(counters->tx_underun);
+}
+
+static const struct ethtool_ops rtase_ethtool_ops = {
+	.get_drvinfo = rtase_get_drvinfo,
+	.get_link = ethtool_op_get_link,
+	.get_link_ksettings = rtase_get_settings,
+	.get_pauseparam = rtase_get_pauseparam,
+	.set_pauseparam = rtase_set_pauseparam,
+	.get_strings = rtase_get_strings,
+	.get_sset_count = rtase_get_sset_count,
+	.get_ethtool_stats = rtase_get_ethtool_stats,
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static void rtase_init_netdev_ops(struct net_device *dev)
 {
 	dev->netdev_ops = &rtase_netdev_ops;
+	dev->ethtool_ops = &rtase_ethtool_ops;
 }
 
 static void rtase_reset_interrupt(struct pci_dev *pdev,
-- 
2.34.1

[PATCH net-next v14 11/13] rtase: Add a Makefile in the rtase folder

[Justin Lai]

Add a Makefile in the rtase folder to build rtase driver.

Signed-off-by: Justin Lai <justinlai0215@realtek.com>
---
 drivers/net/ethernet/realtek/rtase/Makefile | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 drivers/net/ethernet/realtek/rtase/Makefile

diff --git a/drivers/net/ethernet/realtek/rtase/Makefile b/drivers/net/ethernet/realtek/rtase/Makefile
new file mode 100644
index 000000000000..f29b14687950
--- /dev/null
+++ b/drivers/net/ethernet/realtek/rtase/Makefile
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+# Copyright(c) 2023 Realtek Semiconductor Corp. All rights reserved.
+
+#
+# Makefile for the Realtek PCIe driver
+#
+
+obj-$(CONFIG_RTASE) += rtase.o
+
+rtase-objs := rtase_main.o
-- 
2.34.1

[PATCH net-next v14 12/13] realtek: Update the Makefile and Kconfig in the realtek folder

[Justin Lai]

1. Add the RTASE entry in the Kconfig.
2. Add the CONFIG_RTASE entry in the Makefile.

Signed-off-by: Justin Lai <justinlai0215@realtek.com>
---
 drivers/net/ethernet/realtek/Kconfig  | 17 +++++++++++++++++
 drivers/net/ethernet/realtek/Makefile |  1 +
 2 files changed, 18 insertions(+)

diff --git a/drivers/net/ethernet/realtek/Kconfig b/drivers/net/ethernet/realtek/Kconfig
index 93d9df55b361..57ef924deebd 100644
--- a/drivers/net/ethernet/realtek/Kconfig
+++ b/drivers/net/ethernet/realtek/Kconfig
@@ -113,4 +113,21 @@ config R8169
 	  To compile this driver as a module, choose M here: the module
 	  will be called r8169.  This is recommended.
 
+config RTASE
+	tristate "Realtek Automotive Switch 9054/9068/9072/9075/9068/9071 PCIe Interface support"
+	depends on PCI
+	select CRC32
+	help
+	  Say Y here if you have a Realtek Ethernet adapter belonging to
+	  the following families:
+	  RTL9054 5GBit Ethernet
+	  RTL9068 5GBit Ethernet
+	  RTL9072 5GBit Ethernet
+	  RTL9075 5GBit Ethernet
+	  RTL9068 5GBit Ethernet
+	  RTL9071 5GBit Ethernet
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called rtase. This is recommended.
+
 endif # NET_VENDOR_REALTEK
diff --git a/drivers/net/ethernet/realtek/Makefile b/drivers/net/ethernet/realtek/Makefile
index 2e1d78b106b0..0c1c16f63e9a 100644
--- a/drivers/net/ethernet/realtek/Makefile
+++ b/drivers/net/ethernet/realtek/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_8139TOO) += 8139too.o
 obj-$(CONFIG_ATP) += atp.o
 r8169-objs += r8169_main.o r8169_firmware.o r8169_phy_config.o
 obj-$(CONFIG_R8169) += r8169.o
+obj-$(CONFIG_RTASE) += rtase/
-- 
2.34.1

[PATCH net-next v14 13/13] MAINTAINERS: Add the rtase ethernet driver entry

[Justin Lai]

Add myself and Larry Chiu as the maintainer for the rtase ethernet driver.

Signed-off-by: Justin Lai <justinlai0215@realtek.com>
---
 MAINTAINERS | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 53b7ca804465..239aae94dc0f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18476,6 +18476,13 @@ L:	linux-remoteproc@vger.kernel.org
 S:	Maintained
 F:	drivers/tty/rpmsg_tty.c
 
+RTASE ETHERNET DRIVER
+M:	Justin Lai <justinlai0215@realtek.com>
+M:	Larry Chiu <larry.chiu@realtek.com>
+L:	netdev@vger.kernel.org
+S:	Maintained
+F:	drivers/net/ethernet/realtek/rtase/
+
 RTL2830 MEDIA DRIVER
 M:	Antti Palosaari <crope@iki.fi>
 L:	linux-media@vger.kernel.org
-- 
2.34.1

Re: [PATCH net-next v14 01/13] rtase: Add pci table supported in this module

[Paolo Abeni]

On Fri, 2023-12-08 at 17:47 +0800, Justin Lai wrote:
[...]
> +static void rtase_remove_one(struct pci_dev *pdev)
> +{
> +	struct net_device *dev = pci_get_drvdata(pdev);
> +	struct rtase_private *tp = netdev_priv(dev);
> +	struct rtase_int_vector *ivec;
> +	u32 i;
> +
> +	for (i = 0; i < tp->int_nums; i++) {
> +		ivec = &tp->int_vector[i];
> +		netif_napi_del(&ivec->napi);
> +	}

You must unregister the netdev before napi_del or you will risk races.

Cheers,

Paolo

Re: [PATCH net-next v14 02/13] rtase: Implement the .ndo_open function

[Paolo Abeni]

On Fri, 2023-12-08 at 17:47 +0800, Justin Lai wrote:
> +static int rtase_open(struct net_device *dev)
> +{
> +	struct rtase_private *tp = netdev_priv(dev);
> +	struct rtase_int_vector *ivec = &tp->int_vector[0];
> +	const struct pci_dev *pdev = tp->pdev;
> +	int ret;
> +	u16 i;
> +
> +	rtase_set_rxbufsize(tp);
> +
> +	ret = rtase_alloc_desc(tp);
> +	if (ret)
> +		goto err_free_all_allocated_mem;
> +
> +	ret = rtase_init_ring(dev);
> +	if (ret)
> +		goto err_free_all_allocated_mem;
> +
> +	rtase_hw_config(dev);
> +
> +	if (tp->sw_flag & SWF_MSIX_ENABLED) {
> +		ret = request_irq(ivec->irq, rtase_interrupt, 0,
> +				  dev->name, ivec);
> +
> +		/* request other interrupts to handle multiqueue */
> +		for (i = 1; i < tp->int_nums; i++) {
> +			if (ret)
> +				continue;
> +
> +			ivec = &tp->int_vector[i];
> +			if (ivec->status != 1)
> +				continue;
> +
> +			snprintf(ivec->name, sizeof(ivec->name), "%s_int%i", tp->dev->name, i);
> +			ret = request_irq(ivec->irq, rtase_q_interrupt, 0,
> +					  ivec->name, ivec);

It looks like that if the above request_irq fails you will never free 
tp->int_vector[0].irq (and all tp->int_vector[j].irq, for j < i)


Cheers,

Paolo

Re: [PATCH net-next v14 07/13] rtase: Implement a function to receive packets

[Paolo Abeni]

On Fri, 2023-12-08 at 17:47 +0800, Justin Lai wrote:
> Implement rx_handler to read the information of the rx descriptor,
> thereby checking the packet accordingly and storing the packet
> in the socket buffer to complete the reception of the packet.
> 
> Signed-off-by: Justin Lai <justinlai0215@realtek.com>
> ---
>  .../net/ethernet/realtek/rtase/rtase_main.c   | 148 ++++++++++++++++++
>  1 file changed, 148 insertions(+)
> 
> diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c
> index eee792ea4760..83a119389110 100644
> --- a/drivers/net/ethernet/realtek/rtase/rtase_main.c
> +++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
> @@ -451,6 +451,154 @@ static void rtase_rx_ring_clear(struct rtase_ring *ring)
>  	}
>  }
>  
> +static int rtase_fragmented_frame(u32 status)
> +{
> +	return (status & (RX_FIRST_FRAG | RX_LAST_FRAG)) !=
> +		(RX_FIRST_FRAG | RX_LAST_FRAG);
> +}
> +
> +static void rtase_rx_csum(const struct rtase_private *tp, struct sk_buff *skb,
> +			  const union rx_desc *desc)
> +{
> +	u32 opts2 = le32_to_cpu(desc->desc_status.opts2);
> +
> +	/* rx csum offload */
> +	if (((opts2 & RX_V4F) && !(opts2 & RX_IPF)) || (opts2 & RX_V6F)) {
> +		if (((opts2 & RX_TCPT) && !(opts2 & RX_TCPF)) ||
> +		    ((opts2 & RX_UDPT) && !(opts2 & RX_UDPF))) {
> +			skb->ip_summed = CHECKSUM_UNNECESSARY;
> +		} else {
> +			skb->ip_summed = CHECKSUM_NONE;
> +		}
> +	} else {
> +		skb->ip_summed = CHECKSUM_NONE;
> +	}
> +}
> +
> +static void rtase_rx_vlan_skb(union rx_desc *desc, struct sk_buff *skb)
> +{
> +	u32 opts2 = le32_to_cpu(desc->desc_status.opts2);
> +
> +	if (!(opts2 & RX_VLAN_TAG))
> +		return;
> +
> +	__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), swab16(opts2 & VLAN_TAG_MASK));
> +}
> +
> +static void rtase_rx_skb(const struct rtase_ring *ring, struct sk_buff *skb)
> +{
> +	struct rtase_int_vector *ivec = ring->ivec;
> +
> +	napi_gro_receive(&ivec->napi, skb);
> +}
> +
> +static int rx_handler(struct rtase_ring *ring, int budget)
> +{
> +	const struct rtase_private *tp = ring->ivec->tp;
> +	u32 pkt_size, cur_rx, delta, entry, status;
> +	union rx_desc *desc_base = ring->desc;
> +	struct net_device *dev = tp->dev;
> +	struct sk_buff *skb;
> +	union rx_desc *desc;
> +	int workdone = 0;
> +
> +	if (!ring->desc)
> +		return workdone;

Why is the above test required? How can be ring->desc NULL here?

> +
> +	cur_rx = ring->cur_idx;
> +	entry = cur_rx % NUM_DESC;
> +	desc = &desc_base[entry];
> +
> +	do {
> +		/* make sure discriptor has been updated */
> +		rmb();
> +		status = le32_to_cpu(desc->desc_status.opts1);
> +
> +		if (status & DESC_OWN)
> +			break;
> +
> +		if (unlikely(status & RX_RES)) {
> +			if (net_ratelimit())
> +				netdev_warn(dev, "Rx ERROR. status = %08x\n",
> +					    status);
> +
> +			dev->stats.rx_errors++;
> +
> +			if (status & (RX_RWT | RX_RUNT))
> +				dev->stats.rx_length_errors++;

The device has a single RX queue, right? Otherwise this kind of stats
accounting is going to be costly.

Cheers,

Paolo

Re: [PATCH net-next v14 08/13] rtase: Implement net_device_ops

[Paolo Abeni]

On Fri, 2023-12-08 at 17:47 +0800, Justin Lai wrote:
> +static netdev_features_t rtase_fix_features(struct net_device *dev,
> +					    netdev_features_t features)
> +{
> +	netdev_features_t features_fix = features;
> +
> +	if (dev->mtu > MSS_MAX)
> +		features_fix &= ~NETIF_F_ALL_TSO;
> +
> +	if (dev->mtu > ETH_DATA_LEN)
> +		features_fix &= ~NETIF_F_ALL_TSO;

This latter condition is strictly more restrictive than the previous
one, you can drop the latter. Also could you please drop a note about
the why of it?

Cheers,

Paolo

Re: [PATCH net-next v14 01/13] rtase: Add pci table supported in this module

[Jakub Kicinski]

On Tue, 12 Dec 2023 10:36:16 +0100 Paolo Abeni wrote:
> > +static void rtase_remove_one(struct pci_dev *pdev)
> > +{
> > +	struct net_device *dev = pci_get_drvdata(pdev);
> > +	struct rtase_private *tp = netdev_priv(dev);
> > +	struct rtase_int_vector *ivec;
> > +	u32 i;
> > +
> > +	for (i = 0; i < tp->int_nums; i++) {
> > +		ivec = &tp->int_vector[i];
> > +		netif_napi_del(&ivec->napi);
> > +	}  
> 
> You must unregister the netdev before napi_del or you will risk races.

Or del them in the ndo_open / ndo_stop... Note that ndo_stop is always
called if ndo_open was called.

Re: [PATCH net-next v14 09/13] rtase: Implement pci_driver suspend and resume function

[Jakub Kicinski]

On Fri, 8 Dec 2023 17:47:29 +0800 Justin Lai wrote:
> +static int rtase_suspend(struct device *device)
> +{
> +	struct net_device *dev = dev_get_drvdata(device);
> +
> +	if (netif_running(dev)) {
> +		netif_stop_queue(dev);
> +		netif_device_detach(dev);

detach stops the queue, you don't have to call both

> +		rtase_hw_reset(dev);

Re: [PATCH net-next v14 10/13] rtase: Implement ethtool function

[Jakub Kicinski]

On Fri, 8 Dec 2023 17:47:30 +0800 Justin Lai wrote:
> +static const char rtase_gstrings[][ETH_GSTRING_LEN] = {
> +	"tx_packets",
> +	"rx_packets",
> +	"tx_errors",
> +	"rx_errors",
> +	"rx_missed",
> +	"align_errors",
> +	"tx_single_collisions",
> +	"tx_multi_collisions",
> +	"unicast",
> +	"broadcast",
> +	"multicast",
> +	"tx_aborted",
> +	"tx_underrun",

Please take a look at struct rtnl_link_stats, anything that's already
present there should be reported via ndo_get_stats64, not ethtool

Re: [PATCH net-next v14 13/13] MAINTAINERS: Add the rtase ethernet driver entry

[Jakub Kicinski]

On Fri, 8 Dec 2023 17:47:33 +0800 Justin Lai wrote:
> Add myself and Larry Chiu as the maintainer for the rtase ethernet driver.

Sorry if I already said this but please familiarize yourself with the
responsibilities per:
https://docs.kernel.org/next/maintainer/feature-and-driver-maintainers.html

Re: [PATCH net-next v14 03/13] rtase: Implement the rtase_down function

[Jakub Kicinski]

On Fri, 8 Dec 2023 17:47:23 +0800 Justin Lai wrote:
> +	netif_stop_queue(dev);

You most likely want to stop the napi before you call this.
Otherwise NAPI can do some clean up and restart the queue.

> +	/* give a racing hard_start_xmit a few cycles to complete */
> +	synchronize_rcu();

Call netif_tx_disable() instead of stop_queue(), it takes the tx lock
so you don't have to worry about in-flight packets.

> +	netif_carrier_off(dev);
> +
> +	for (i = 0; i < tp->int_nums; i++) {
> +		ivec = &tp->int_vector[i];
> +		synchronize_irq(ivec->irq);

Why?

> +		/* wait for any pending NAPI task to complete */
> +		napi_disable(&ivec->napi);
> +	}

Re: [PATCH net-next v14 06/13] rtase: Implement .ndo_start_xmit function

[Jakub Kicinski]

On Fri, 8 Dec 2023 17:47:26 +0800 Justin Lai wrote:
> +static int tx_handler(struct rtase_ring *ring, int budget)

I don't see how this is called, the way you split the submission makes
it a bit hard to review, oh well. Anyway - if you pass the NAPI budget
here - that's not right, it may be 0, and you'd loop forever.
For Tx - you should try to reap some fixed number of packets, say 128,
the budget is for Rx, not for Tx.

> +	const struct rtase_private *tp = ring->ivec->tp;
> +	struct net_device *dev = tp->dev;
> +	int workdone = 0;
> +	u32 dirty_tx;
> +	u32 tx_left;
> +
> +	dirty_tx = ring->dirty_idx;
> +	tx_left = READ_ONCE(ring->cur_idx) - dirty_tx;
> +
> +	while (tx_left > 0) {
> +		u32 entry = dirty_tx % NUM_DESC;
> +		struct tx_desc *desc = ring->desc +
> +				       sizeof(struct tx_desc) * entry;
> +		u32 len = ring->mis.len[entry];
> +		u32 status;
> +
> +		status = le32_to_cpu(desc->opts1);
> +
> +		if (status & DESC_OWN)
> +			break;
> +
> +		rtase_unmap_tx_skb(tp->pdev, len, desc);
> +		ring->mis.len[entry] = 0;
> +		if (ring->skbuff[entry]) {
> +			dev_consume_skb_any(ring->skbuff[entry]);

napi_consume_skb, assuming you call this from NAPI

> +			ring->skbuff[entry] = NULL;
> +		}
> +
> +		dev->stats.tx_bytes += len;
> +		dev->stats.tx_packets++;
> +		dirty_tx++;
> +		tx_left--;
> +		workdone++;
> +
> +		if (workdone == budget)
> +			break;
> +	}
> +
> +	if (ring->dirty_idx != dirty_tx) {
> +		WRITE_ONCE(ring->dirty_idx, dirty_tx);
> +
> +		if (__netif_subqueue_stopped(dev, ring->index) &&
> +		    rtase_tx_avail(ring))
> +			netif_start_subqueue(dev, ring->index);

Please use the start / stop macros from include/net/netdev_queues.h
I'm pretty sure the current code is racy.

> +		if (ring->cur_idx != dirty_tx)
> +			rtase_w8(tp, RTASE_TPPOLL, BIT(ring->index));
> +	}
> +
> +	return workdone;
> +}

> +	/* multiqueues */
> +	q_idx = skb_get_queue_mapping(skb);
> +	ring = &tp->tx_ring[q_idx];

As Paolo pointed out elsewhere you seem to only support one queue.
Remove this indirection, please, and always use queue 0, otherwise
it's a bit confusing.

RE: [PATCH net-next v14 01/13] rtase: Add pci table supported in this module

[JustinLai0215]

> -----Original Message-----
> From: Paolo Abeni <pabeni@redhat.com>
> Sent: Tuesday, December 12, 2023 5:36 PM
> To: JustinLai0215 <justinlai0215@realtek.com>; kuba@kernel.org
> Cc: davem@davemloft.net; edumazet@google.com;
> linux-kernel@vger.kernel.org; netdev@vger.kernel.org; andrew@lunn.ch;
> Ping-Ke Shih <pkshih@realtek.com>; Larry Chiu <larry.chiu@realtek.com>
> Subject: Re: [PATCH net-next v14 01/13] rtase: Add pci table supported in this
> module
> 
> 
> External mail.
> 
> 
> 
> On Fri, 2023-12-08 at 17:47 +0800, Justin Lai wrote:
> [...]
> > +static void rtase_remove_one(struct pci_dev *pdev) {
> > +     struct net_device *dev = pci_get_drvdata(pdev);
> > +     struct rtase_private *tp = netdev_priv(dev);
> > +     struct rtase_int_vector *ivec;
> > +     u32 i;
> > +
> > +     for (i = 0; i < tp->int_nums; i++) {
> > +             ivec = &tp->int_vector[i];
> > +             netif_napi_del(&ivec->napi);
> > +     }
> 
> You must unregister the netdev before napi_del or you will risk races.

Ok, Thank you for your suggestion.

> 
> Cheers,
> 
> Paolo

RE: [PATCH net-next v14 02/13] rtase: Implement the .ndo_open function

[JustinLai0215]

> -----Original Message-----
> From: Paolo Abeni <pabeni@redhat.com>
> Sent: Tuesday, December 12, 2023 5:50 PM
> To: JustinLai0215 <justinlai0215@realtek.com>; kuba@kernel.org
> Cc: davem@davemloft.net; edumazet@google.com;
> linux-kernel@vger.kernel.org; netdev@vger.kernel.org; andrew@lunn.ch;
> Ping-Ke Shih <pkshih@realtek.com>; Larry Chiu <larry.chiu@realtek.com>
> Subject: Re: [PATCH net-next v14 02/13] rtase: Implement the .ndo_open
> function
> 
> 
> External mail.
> 
> 
> 
> On Fri, 2023-12-08 at 17:47 +0800, Justin Lai wrote:
> > +static int rtase_open(struct net_device *dev) {
> > +     struct rtase_private *tp = netdev_priv(dev);
> > +     struct rtase_int_vector *ivec = &tp->int_vector[0];
> > +     const struct pci_dev *pdev = tp->pdev;
> > +     int ret;
> > +     u16 i;
> > +
> > +     rtase_set_rxbufsize(tp);
> > +
> > +     ret = rtase_alloc_desc(tp);
> > +     if (ret)
> > +             goto err_free_all_allocated_mem;
> > +
> > +     ret = rtase_init_ring(dev);
> > +     if (ret)
> > +             goto err_free_all_allocated_mem;
> > +
> > +     rtase_hw_config(dev);
> > +
> > +     if (tp->sw_flag & SWF_MSIX_ENABLED) {
> > +             ret = request_irq(ivec->irq, rtase_interrupt, 0,
> > +                               dev->name, ivec);
> > +
> > +             /* request other interrupts to handle multiqueue */
> > +             for (i = 1; i < tp->int_nums; i++) {
> > +                     if (ret)
> > +                             continue;
> > +
> > +                     ivec = &tp->int_vector[i];
> > +                     if (ivec->status != 1)
> > +                             continue;
> > +
> > +                     snprintf(ivec->name, sizeof(ivec->name),
> "%s_int%i", tp->dev->name, i);
> > +                     ret = request_irq(ivec->irq, rtase_q_interrupt, 0,
> > +                                       ivec->name, ivec);
> 
> It looks like that if the above request_irq fails you will never free
> tp->int_vector[0].irq (and all tp->int_vector[j].irq, for j < i)
> 
Thanks for the reminder, I will fix it.
> 
> Cheers,
> 
> Paolo

RE: [PATCH net-next v14 07/13] rtase: Implement a function to receive packets

[JustinLai0215]

> On Fri, 2023-12-08 at 17:47 +0800, Justin Lai wrote:
> > Implement rx_handler to read the information of the rx descriptor,
> > thereby checking the packet accordingly and storing the packet in the
> > socket buffer to complete the reception of the packet.
> >
> > Signed-off-by: Justin Lai <justinlai0215@realtek.com>
> > ---
> >  .../net/ethernet/realtek/rtase/rtase_main.c   | 148 ++++++++++++++++++
> >  1 file changed, 148 insertions(+)
> >
> > diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c
> > b/drivers/net/ethernet/realtek/rtase/rtase_main.c
> > index eee792ea4760..83a119389110 100644
> > --- a/drivers/net/ethernet/realtek/rtase/rtase_main.c
> > +++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
> > @@ -451,6 +451,154 @@ static void rtase_rx_ring_clear(struct rtase_ring
> *ring)
> >       }
> >  }
> >
> > +static int rtase_fragmented_frame(u32 status) {
> > +     return (status & (RX_FIRST_FRAG | RX_LAST_FRAG)) !=
> > +             (RX_FIRST_FRAG | RX_LAST_FRAG); }
> > +
> > +static void rtase_rx_csum(const struct rtase_private *tp, struct sk_buff
> *skb,
> > +                       const union rx_desc *desc) {
> > +     u32 opts2 = le32_to_cpu(desc->desc_status.opts2);
> > +
> > +     /* rx csum offload */
> > +     if (((opts2 & RX_V4F) && !(opts2 & RX_IPF)) || (opts2 & RX_V6F)) {
> > +             if (((opts2 & RX_TCPT) && !(opts2 & RX_TCPF)) ||
> > +                 ((opts2 & RX_UDPT) && !(opts2 & RX_UDPF))) {
> > +                     skb->ip_summed = CHECKSUM_UNNECESSARY;
> > +             } else {
> > +                     skb->ip_summed = CHECKSUM_NONE;
> > +             }
> > +     } else {
> > +             skb->ip_summed = CHECKSUM_NONE;
> > +     }
> > +}
> > +
> > +static void rtase_rx_vlan_skb(union rx_desc *desc, struct sk_buff
> > +*skb) {
> > +     u32 opts2 = le32_to_cpu(desc->desc_status.opts2);
> > +
> > +     if (!(opts2 & RX_VLAN_TAG))
> > +             return;
> > +
> > +     __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), swab16(opts2 &
> > +VLAN_TAG_MASK)); }
> > +
> > +static void rtase_rx_skb(const struct rtase_ring *ring, struct
> > +sk_buff *skb) {
> > +     struct rtase_int_vector *ivec = ring->ivec;
> > +
> > +     napi_gro_receive(&ivec->napi, skb); }
> > +
> > +static int rx_handler(struct rtase_ring *ring, int budget) {
> > +     const struct rtase_private *tp = ring->ivec->tp;
> > +     u32 pkt_size, cur_rx, delta, entry, status;
> > +     union rx_desc *desc_base = ring->desc;
> > +     struct net_device *dev = tp->dev;
> > +     struct sk_buff *skb;
> > +     union rx_desc *desc;
> > +     int workdone = 0;
> > +
> > +     if (!ring->desc)
> > +             return workdone;
> 
> Why is the above test required? How can be ring->desc NULL here?

This is unnecessary judgment and I will remove it.
> 

RE: [PATCH net-next v14 08/13] rtase: Implement net_device_ops

[JustinLai0215]

> 
> On Fri, 2023-12-08 at 17:47 +0800, Justin Lai wrote:
> > +static netdev_features_t rtase_fix_features(struct net_device *dev,
> > +                                         netdev_features_t
> features)
> > +{
> > +     netdev_features_t features_fix = features;
> > +
> > +     if (dev->mtu > MSS_MAX)
> > +             features_fix &= ~NETIF_F_ALL_TSO;
> > +
> > +     if (dev->mtu > ETH_DATA_LEN)
> > +             features_fix &= ~NETIF_F_ALL_TSO;
> 
> This latter condition is strictly more restrictive than the previous one, you can
> drop the latter. Also could you please drop a note about the why of it?

We don't support TSO for jumbo frames, so I will remove the MSS_MAX part.
> 
> Cheers,
> 
> Paolo

RE: [PATCH net-next v14 09/13] rtase: Implement pci_driver suspend and resume function

[JustinLai0215]

> 
> On Fri, 8 Dec 2023 17:47:29 +0800 Justin Lai wrote:
> > +static int rtase_suspend(struct device *device) {
> > +     struct net_device *dev = dev_get_drvdata(device);
> > +
> > +     if (netif_running(dev)) {
> > +             netif_stop_queue(dev);
> > +             netif_device_detach(dev);
> 
> detach stops the queue, you don't have to call both

Thanks for the reminder, I will modify it.
> 
> > +             rtase_hw_reset(dev);

RE: [PATCH net-next v14 13/13] MAINTAINERS: Add the rtase ethernet driver entry

[JustinLai0215]

> 
> On Fri, 8 Dec 2023 17:47:33 +0800 Justin Lai wrote:
> > Add myself and Larry Chiu as the maintainer for the rtase ethernet driver.
> 
> Sorry if I already said this but please familiarize yourself with the
> responsibilities per:
> https://docs.kernel.org/next/maintainer/feature-and-driver-maintainers.html

Larry Chiu is also one of the authors of this driver, so he is added as maintainer.
I would like to ask if you have any questions about this part?

RE: [PATCH net-next v14 03/13] rtase: Implement the rtase_down function

[JustinLai0215]

> 
> On Fri, 8 Dec 2023 17:47:23 +0800 Justin Lai wrote:
> > +     netif_stop_queue(dev);
> 
> You most likely want to stop the napi before you call this.
> Otherwise NAPI can do some clean up and restart the queue.
> 
> > +     /* give a racing hard_start_xmit a few cycles to complete */
> > +     synchronize_rcu();
> 
> Call netif_tx_disable() instead of stop_queue(), it takes the tx lock so you don't
> have to worry about in-flight packets.

Thanks for your suggestion, I will modify it.
> 
> > +     netif_carrier_off(dev);
> > +
> > +     for (i = 0; i < tp->int_nums; i++) {
> > +             ivec = &tp->int_vector[i];
> > +             synchronize_irq(ivec->irq);
> 
> Why?

This is redundant code, I will remove it.
> 
> > +             /* wait for any pending NAPI task to complete */
> > +             napi_disable(&ivec->napi);
> > +     }

RE: [PATCH net-next v14 06/13] rtase: Implement .ndo_start_xmit function

[JustinLai0215]

> 
> On Fri, 8 Dec 2023 17:47:26 +0800 Justin Lai wrote:
> > +static int tx_handler(struct rtase_ring *ring, int budget)
> 
> I don't see how this is called, the way you split the submission makes it a bit
> hard to review, oh well. Anyway - if you pass the NAPI budget here - that's not
> right, it may be 0, and you'd loop forever.
> For Tx - you should try to reap some fixed number of packets, say 128, the
> budget is for Rx, not for Tx.

Even if the budget is 0, this function will not loop forever, it will just run all tx_left.
Or what changes would you like us to make?
> 
> > +     const struct rtase_private *tp = ring->ivec->tp;
> > +     struct net_device *dev = tp->dev;
> > +     int workdone = 0;
> > +     u32 dirty_tx;
> > +     u32 tx_left;
> > +
> > +     dirty_tx = ring->dirty_idx;
> > +     tx_left = READ_ONCE(ring->cur_idx) - dirty_tx;
> > +
> > +     while (tx_left > 0) {
> > +             u32 entry = dirty_tx % NUM_DESC;
> > +             struct tx_desc *desc = ring->desc +
> > +                                    sizeof(struct tx_desc) * entry;
> > +             u32 len = ring->mis.len[entry];
> > +             u32 status;
> > +
> > +             status = le32_to_cpu(desc->opts1);
> > +
> > +             if (status & DESC_OWN)
> > +                     break;
> > +
> > +             rtase_unmap_tx_skb(tp->pdev, len, desc);
> > +             ring->mis.len[entry] = 0;
> > +             if (ring->skbuff[entry]) {
> > +                     dev_consume_skb_any(ring->skbuff[entry]);
> 
> napi_consume_skb, assuming you call this from NAPI

Ok, I will modify it.
> 
> > +                     ring->skbuff[entry] = NULL;
> > +             }
> > +
> > +             dev->stats.tx_bytes += len;
> > +             dev->stats.tx_packets++;
> > +             dirty_tx++;
> > +             tx_left--;
> > +             workdone++;
> > +
> > +             if (workdone == budget)
> > +                     break;
> > +     }
> > +
> > +     if (ring->dirty_idx != dirty_tx) {
> > +             WRITE_ONCE(ring->dirty_idx, dirty_tx);
> > +
> > +             if (__netif_subqueue_stopped(dev, ring->index) &&
> > +                 rtase_tx_avail(ring))
> > +                     netif_start_subqueue(dev, ring->index);
> 
> Please use the start / stop macros from include/net/netdev_queues.h I'm
> pretty sure the current code is racy.
> 

Ok, I will use the macros from include/net/netdev_queues.h.

Re: [PATCH net-next v14 06/13] rtase: Implement .ndo_start_xmit function

[Jakub Kicinski]

On Thu, 14 Dec 2023 13:00:29 +0000 JustinLai0215 wrote:
> > I don't see how this is called, the way you split the submission makes it a bit
> > hard to review, oh well. Anyway - if you pass the NAPI budget here - that's not
> > right, it may be 0, and you'd loop forever.
> > For Tx - you should try to reap some fixed number of packets, say 128, the
> > budget is for Rx, not for Tx.  
> 
> Even if the budget is 0, this function will not loop forever, it will just run all tx_left.
> Or what changes would you like us to make?

Ah, good point. It does seem a little accidental to me :S
In that case perhaps always consume all completed packets?
@budget should not constrain Tx completions directly, see:
https://www.kernel.org/doc/html/next/networking/napi.html

Re: [PATCH net-next v14 13/13] MAINTAINERS: Add the rtase ethernet driver entry

[Jakub Kicinski]

On Thu, 14 Dec 2023 12:51:31 +0000 JustinLai0215 wrote:
> > https://docs.kernel.org/next/maintainer/feature-and-driver-maintainers.html  
> 
> Larry Chiu is also one of the authors of this driver, so he is added as maintainer.
> I would like to ask if you have any questions about this part?

No questions at this stage, I just wanted to make sure you're familiar
with the guidelines. To avoid mistakes and misunderstandings later.

RE: [PATCH net-next v14 07/13] rtase: Implement a function to receive packets

[Justin Lai]

> > +
> > +     cur_rx = ring->cur_idx;
> > +     entry = cur_rx % NUM_DESC;
> > +     desc = &desc_base[entry];
> > +
> > +     do {
> > +             /* make sure discriptor has been updated */
> > +             rmb();
> > +             status = le32_to_cpu(desc->desc_status.opts1);
> > +
> > +             if (status & DESC_OWN)
> > +                     break;
> > +
> > +             if (unlikely(status & RX_RES)) {
> > +                     if (net_ratelimit())
> > +                             netdev_warn(dev, "Rx ERROR. status =
> %08x\n",
> > +                                         status);
> > +
> > +                     dev->stats.rx_errors++;
> > +
> > +                     if (status & (RX_RWT | RX_RUNT))
> > +                             dev->stats.rx_length_errors++;
> 
> The device has a single RX queue, right? Otherwise this kind of stats
> accounting is going to be costly.
> 
> Cheers,
> 
> Paolo

Hi, Paolo

This device supports multiple RX queue.
Could you please provide an example of how you would like it done?

RE: [PATCH net-next v14 06/13] rtase: Implement .ndo_start_xmit function

[Justin Lai]

> 
> > +             if (ring->cur_idx != dirty_tx)
> > +                     rtase_w8(tp, RTASE_TPPOLL, BIT(ring->index));
> > +     }
> > +
> > +     return workdone;
> > +}
> 
> > +     /* multiqueues */
> > +     q_idx = skb_get_queue_mapping(skb);
> > +     ring = &tp->tx_ring[q_idx];
> 
> As Paolo pointed out elsewhere you seem to only support one queue.
> Remove this indirection, please, and always use queue 0, otherwise it's a bit
> confusing.

Hi Jakub,

This device supports Multi-Queue.