Resguardo inicial

linux-7.2.3/drivers/vdpa/solidrun/Makefile

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_SNET_VDPA) += snet_vdpa.o
+snet_vdpa-$(CONFIG_SNET_VDPA) += snet_main.o
+snet_vdpa-$(CONFIG_SNET_VDPA) += snet_ctrl.o
+ifdef CONFIG_HWMON
+snet_vdpa-$(CONFIG_SNET_VDPA) += snet_hwmon.o
+endif

linux-7.2.3/drivers/vdpa/solidrun/snet_ctrl.c

@@ -0,0 +1,336 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SolidRun DPU driver for control plane
+ *
+ * Copyright (C) 2022-2023 SolidRun
+ *
+ * Author: Alvaro Karsz <alvaro.karsz@solid-run.com>
+ *
+ */
+
+#include <linux/iopoll.h>
+
+#include "snet_vdpa.h"
+
+enum snet_ctrl_opcodes {
+	SNET_CTRL_OP_DESTROY = 1,
+	SNET_CTRL_OP_READ_VQ_STATE,
+	SNET_CTRL_OP_SUSPEND,
+	SNET_CTRL_OP_RESUME,
+};
+
+#define SNET_CTRL_TIMEOUT	        2000000
+
+#define SNET_CTRL_DATA_SIZE_MASK	0x0000FFFF
+#define SNET_CTRL_IN_PROCESS_MASK	0x00010000
+#define SNET_CTRL_CHUNK_RDY_MASK	0x00020000
+#define SNET_CTRL_ERROR_MASK		0x0FFC0000
+
+#define SNET_VAL_TO_ERR(val)		(-(((val) & SNET_CTRL_ERROR_MASK) >> 18))
+#define SNET_EMPTY_CTRL(val)		(((val) & SNET_CTRL_ERROR_MASK) || \
+						!((val) & SNET_CTRL_IN_PROCESS_MASK))
+#define SNET_DATA_READY(val)		((val) & (SNET_CTRL_ERROR_MASK | SNET_CTRL_CHUNK_RDY_MASK))
+
+/* Control register used to read data from the DPU */
+struct snet_ctrl_reg_ctrl {
+	/* Chunk size in 4B words */
+	u16 data_size;
+	/* We are in the middle of a command */
+	u16 in_process:1;
+	/* A data chunk is ready and can be consumed */
+	u16 chunk_ready:1;
+	/* Error code */
+	u16 error:10;
+	/* Saved for future usage */
+	u16 rsvd:4;
+};
+
+/* Opcode register */
+struct snet_ctrl_reg_op {
+	u16 opcode;
+	/* Only if VQ index is relevant for the command */
+	u16 vq_idx;
+};
+
+struct snet_ctrl_regs {
+	struct snet_ctrl_reg_op op;
+	struct snet_ctrl_reg_ctrl ctrl;
+	u32 rsvd;
+	u32 data[];
+};
+
+static struct snet_ctrl_regs __iomem *snet_get_ctrl(struct snet *snet)
+{
+	return snet->bar + snet->psnet->cfg.ctrl_off;
+}
+
+static int snet_wait_for_empty_ctrl(struct snet_ctrl_regs __iomem *regs)
+{
+	u32 val;
+
+	return readx_poll_timeout(ioread32, &regs->ctrl, val, SNET_EMPTY_CTRL(val), 10,
+				  SNET_CTRL_TIMEOUT);
+}
+
+static int snet_wait_for_empty_op(struct snet_ctrl_regs __iomem *regs)
+{
+	u32 val;
+
+	return readx_poll_timeout(ioread32, &regs->op, val, !val, 10, SNET_CTRL_TIMEOUT);
+}
+
+static int snet_wait_for_data(struct snet_ctrl_regs __iomem *regs)
+{
+	u32 val;
+
+	return readx_poll_timeout(ioread32, &regs->ctrl, val, SNET_DATA_READY(val), 10,
+				  SNET_CTRL_TIMEOUT);
+}
+
+static u32 snet_read32_word(struct snet_ctrl_regs __iomem *ctrl_regs, u16 word_idx)
+{
+	return ioread32(&ctrl_regs->data[word_idx]);
+}
+
+static u32 snet_read_ctrl(struct snet_ctrl_regs __iomem *ctrl_regs)
+{
+	return ioread32(&ctrl_regs->ctrl);
+}
+
+static void snet_write_ctrl(struct snet_ctrl_regs __iomem *ctrl_regs, u32 val)
+{
+	iowrite32(val, &ctrl_regs->ctrl);
+}
+
+static void snet_write_op(struct snet_ctrl_regs __iomem *ctrl_regs, u32 val)
+{
+	iowrite32(val, &ctrl_regs->op);
+}
+
+static int snet_wait_for_dpu_completion(struct snet_ctrl_regs __iomem *ctrl_regs)
+{
+	/* Wait until the DPU finishes completely.
+	 * It will clear the opcode register.
+	 */
+	return snet_wait_for_empty_op(ctrl_regs);
+}
+
+/* Reading ctrl from the DPU:
+ * buf_size must be 4B aligned
+ *
+ * Steps:
+ *
+ * (1) Verify that the DPU is not in the middle of another operation by
+ *     reading the in_process and error bits in the control register.
+ * (2) Write the request opcode and the VQ idx in the opcode register
+ *     and write the buffer size in the control register.
+ * (3) Start readind chunks of data, chunk_ready bit indicates that a
+ *     data chunk is available, we signal that we read the data by clearing the bit.
+ * (4) Detect that the transfer is completed when the in_process bit
+ *     in the control register is cleared or when the an error appears.
+ */
+static int snet_ctrl_read_from_dpu(struct snet *snet, u16 opcode, u16 vq_idx, void *buffer,
+				   u32 buf_size)
+{
+	struct pci_dev *pdev = snet->pdev;
+	struct snet_ctrl_regs __iomem *regs = snet_get_ctrl(snet);
+	u32 *bfr_ptr = (u32 *)buffer;
+	u32 val;
+	u16 buf_words;
+	int ret;
+	u16 words, i, tot_words = 0;
+
+	/* Supported for config 2+ */
+	if (!SNET_CFG_VER(snet, 2))
+		return -EOPNOTSUPP;
+
+	if (!IS_ALIGNED(buf_size, 4))
+		return -EINVAL;
+
+	mutex_lock(&snet->ctrl_lock);
+
+	buf_words = buf_size / 4;
+
+	/* Make sure control register is empty */
+	ret = snet_wait_for_empty_ctrl(regs);
+	if (ret) {
+		SNET_WARN(pdev, "Timeout waiting for previous control data to be consumed\n");
+		goto exit;
+	}
+
+	/* We need to write the buffer size in the control register, and the opcode + vq index in
+	 * the opcode register.
+	 * We use a spinlock to serialize the writes.
+	 */
+	spin_lock(&snet->ctrl_spinlock);
+
+	snet_write_ctrl(regs, buf_words);
+	snet_write_op(regs, opcode | (vq_idx << 16));
+
+	spin_unlock(&snet->ctrl_spinlock);
+
+	while (buf_words != tot_words) {
+		ret = snet_wait_for_data(regs);
+		if (ret) {
+			SNET_WARN(pdev, "Timeout waiting for control data\n");
+			goto exit;
+		}
+
+		val = snet_read_ctrl(regs);
+
+		/* Error? */
+		if (val & SNET_CTRL_ERROR_MASK) {
+			ret = SNET_VAL_TO_ERR(val);
+			SNET_WARN(pdev, "Error while reading control data from DPU, err %d\n", ret);
+			goto exit;
+		}
+
+		words = min_t(u16, val & SNET_CTRL_DATA_SIZE_MASK, buf_words - tot_words);
+
+		for (i = 0; i < words; i++) {
+			*bfr_ptr = snet_read32_word(regs, i);
+			bfr_ptr++;
+		}
+
+		tot_words += words;
+
+		/* Is the job completed? */
+		if (!(val & SNET_CTRL_IN_PROCESS_MASK))
+			break;
+
+		/* Clear the chunk ready bit and continue */
+		val &= ~SNET_CTRL_CHUNK_RDY_MASK;
+		snet_write_ctrl(regs, val);
+	}
+
+	ret = snet_wait_for_dpu_completion(regs);
+	if (ret)
+		SNET_WARN(pdev, "Timeout waiting for the DPU to complete a control command\n");
+
+exit:
+	mutex_unlock(&snet->ctrl_lock);
+	return ret;
+}
+
+/* Send a control message to the DPU using the old mechanism
+ * used with config version 1.
+ */
+static int snet_send_ctrl_msg_old(struct snet *snet, u32 opcode)
+{
+	struct pci_dev *pdev = snet->pdev;
+	struct snet_ctrl_regs __iomem *regs = snet_get_ctrl(snet);
+	int ret;
+
+	mutex_lock(&snet->ctrl_lock);
+
+	/* Old mechanism uses just 1 register, the opcode register.
+	 * Make sure that the opcode register is empty, and that the DPU isn't
+	 * processing an old message.
+	 */
+	ret = snet_wait_for_empty_op(regs);
+	if (ret) {
+		SNET_WARN(pdev, "Timeout waiting for previous control message to be ACKed\n");
+		goto exit;
+	}
+
+	/* Write the message */
+	snet_write_op(regs, opcode);
+
+	/* DPU ACKs the message by clearing the opcode register */
+	ret = snet_wait_for_empty_op(regs);
+	if (ret)
+		SNET_WARN(pdev, "Timeout waiting for a control message to be ACKed\n");
+
+exit:
+	mutex_unlock(&snet->ctrl_lock);
+	return ret;
+}
+
+/* Send a control message to the DPU.
+ * A control message is a message without payload.
+ */
+static int snet_send_ctrl_msg(struct snet *snet, u16 opcode, u16 vq_idx)
+{
+	struct pci_dev *pdev = snet->pdev;
+	struct snet_ctrl_regs __iomem *regs = snet_get_ctrl(snet);
+	u32 val;
+	int ret;
+
+	/* If config version is not 2+, use the old mechanism */
+	if (!SNET_CFG_VER(snet, 2))
+		return snet_send_ctrl_msg_old(snet, opcode);
+
+	mutex_lock(&snet->ctrl_lock);
+
+	/* Make sure control register is empty */
+	ret = snet_wait_for_empty_ctrl(regs);
+	if (ret) {
+		SNET_WARN(pdev, "Timeout waiting for previous control data to be consumed\n");
+		goto exit;
+	}
+
+	/* We need to clear the control register and write the opcode + vq index in the opcode
+	 * register.
+	 * We use a spinlock to serialize the writes.
+	 */
+	spin_lock(&snet->ctrl_spinlock);
+
+	snet_write_ctrl(regs, 0);
+	snet_write_op(regs, opcode | (vq_idx << 16));
+
+	spin_unlock(&snet->ctrl_spinlock);
+
+	/* The DPU ACKs control messages by setting the chunk ready bit
+	 * without data.
+	 */
+	ret = snet_wait_for_data(regs);
+	if (ret) {
+		SNET_WARN(pdev, "Timeout waiting for control message to be ACKed\n");
+		goto exit;
+	}
+
+	/* Check for errors */
+	val = snet_read_ctrl(regs);
+	ret = SNET_VAL_TO_ERR(val);
+
+	/* Clear the chunk ready bit */
+	val &= ~SNET_CTRL_CHUNK_RDY_MASK;
+	snet_write_ctrl(regs, val);
+
+	ret = snet_wait_for_dpu_completion(regs);
+	if (ret)
+		SNET_WARN(pdev, "Timeout waiting for DPU to complete a control command, err %d\n",
+			  ret);
+
+exit:
+	mutex_unlock(&snet->ctrl_lock);
+	return ret;
+}
+
+void snet_ctrl_clear(struct snet *snet)
+{
+	struct snet_ctrl_regs __iomem *regs = snet_get_ctrl(snet);
+
+	snet_write_op(regs, 0);
+}
+
+int snet_destroy_dev(struct snet *snet)
+{
+	return snet_send_ctrl_msg(snet, SNET_CTRL_OP_DESTROY, 0);
+}
+
+int snet_read_vq_state(struct snet *snet, u16 idx, struct vdpa_vq_state *state)
+{
+	return snet_ctrl_read_from_dpu(snet, SNET_CTRL_OP_READ_VQ_STATE, idx, state,
+				       sizeof(*state));
+}
+
+int snet_suspend_dev(struct snet *snet)
+{
+	return snet_send_ctrl_msg(snet, SNET_CTRL_OP_SUSPEND, 0);
+}
+
+int snet_resume_dev(struct snet *snet)
+{
+	return snet_send_ctrl_msg(snet, SNET_CTRL_OP_RESUME, 0);
+}

linux-7.2.3/drivers/vdpa/solidrun/snet_hwmon.c

@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SolidRun DPU driver for control plane
+ *
+ * Copyright (C) 2022-2023 SolidRun
+ *
+ * Author: Alvaro Karsz <alvaro.karsz@solid-run.com>
+ *
+ */
+#include <linux/hwmon.h>
+
+#include "snet_vdpa.h"
+
+/* Monitor offsets */
+#define SNET_MON_TMP0_IN_OFF      0x00
+#define SNET_MON_TMP0_MAX_OFF     0x08
+#define SNET_MON_TMP0_CRIT_OFF    0x10
+#define SNET_MON_TMP1_IN_OFF      0x18
+#define SNET_MON_TMP1_CRIT_OFF    0x20
+#define SNET_MON_CURR_IN_OFF      0x28
+#define SNET_MON_CURR_MAX_OFF     0x30
+#define SNET_MON_CURR_CRIT_OFF    0x38
+#define SNET_MON_PWR_IN_OFF       0x40
+#define SNET_MON_VOLT_IN_OFF      0x48
+#define SNET_MON_VOLT_CRIT_OFF    0x50
+#define SNET_MON_VOLT_LCRIT_OFF   0x58
+
+static void snet_hwmon_read_reg(struct psnet *psnet, u32 reg, long *out)
+{
+	*out = psnet_read64(psnet, psnet->cfg.hwmon_off + reg);
+}
+
+static umode_t snet_howmon_is_visible(const void *data,
+				      enum hwmon_sensor_types type,
+				      u32 attr, int channel)
+{
+	return 0444;
+}
+
+static int snet_howmon_read(struct device *dev, enum hwmon_sensor_types type,
+			    u32 attr, int channel, long *val)
+{
+	struct psnet *psnet = dev_get_drvdata(dev);
+	int ret = 0;
+
+	switch (type) {
+	case hwmon_in:
+		switch (attr) {
+		case hwmon_in_lcrit:
+			snet_hwmon_read_reg(psnet, SNET_MON_VOLT_LCRIT_OFF, val);
+			break;
+		case hwmon_in_crit:
+			snet_hwmon_read_reg(psnet, SNET_MON_VOLT_CRIT_OFF, val);
+			break;
+		case hwmon_in_input:
+			snet_hwmon_read_reg(psnet, SNET_MON_VOLT_IN_OFF, val);
+			break;
+		default:
+			ret = -EOPNOTSUPP;
+			break;
+		}
+		break;
+
+	case hwmon_power:
+		switch (attr) {
+		case hwmon_power_input:
+			snet_hwmon_read_reg(psnet, SNET_MON_PWR_IN_OFF, val);
+			break;
+
+		default:
+			ret = -EOPNOTSUPP;
+			break;
+		}
+		break;
+
+	case hwmon_curr:
+		switch (attr) {
+		case hwmon_curr_input:
+			snet_hwmon_read_reg(psnet, SNET_MON_CURR_IN_OFF, val);
+			break;
+		case hwmon_curr_max:
+			snet_hwmon_read_reg(psnet, SNET_MON_CURR_MAX_OFF, val);
+			break;
+		case hwmon_curr_crit:
+			snet_hwmon_read_reg(psnet, SNET_MON_CURR_CRIT_OFF, val);
+			break;
+		default:
+			ret = -EOPNOTSUPP;
+			break;
+		}
+		break;
+
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp_input:
+			if (channel == 0)
+				snet_hwmon_read_reg(psnet, SNET_MON_TMP0_IN_OFF, val);
+			else
+				snet_hwmon_read_reg(psnet, SNET_MON_TMP1_IN_OFF, val);
+			break;
+		case hwmon_temp_max:
+			if (channel == 0)
+				snet_hwmon_read_reg(psnet, SNET_MON_TMP0_MAX_OFF, val);
+			else
+				ret = -EOPNOTSUPP;
+			break;
+		case hwmon_temp_crit:
+			if (channel == 0)
+				snet_hwmon_read_reg(psnet, SNET_MON_TMP0_CRIT_OFF, val);
+			else
+				snet_hwmon_read_reg(psnet, SNET_MON_TMP1_CRIT_OFF, val);
+			break;
+
+		default:
+			ret = -EOPNOTSUPP;
+			break;
+		}
+		break;
+
+	default:
+		ret = -EOPNOTSUPP;
+		break;
+	}
+	return ret;
+}
+
+static int snet_hwmon_read_string(struct device *dev,
+				  enum hwmon_sensor_types type, u32 attr,
+				  int channel, const char **str)
+{
+	int ret = 0;
+
+	switch (type) {
+	case hwmon_in:
+		*str = "main_vin";
+		break;
+	case hwmon_power:
+		*str = "soc_pin";
+		break;
+	case hwmon_curr:
+		*str = "soc_iin";
+		break;
+	case hwmon_temp:
+		if (channel == 0)
+			*str = "power_stage_temp";
+		else
+			*str = "ic_junction_temp";
+		break;
+	default:
+		ret = -EOPNOTSUPP;
+		break;
+	}
+	return ret;
+}
+
+static const struct hwmon_ops snet_hwmon_ops = {
+	.is_visible = snet_howmon_is_visible,
+	.read = snet_howmon_read,
+	.read_string = snet_hwmon_read_string
+};
+
+static const struct hwmon_channel_info * const snet_hwmon_info[] = {
+	HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_LABEL,
+			   HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_LABEL),
+	HWMON_CHANNEL_INFO(power, HWMON_P_INPUT | HWMON_P_LABEL),
+	HWMON_CHANNEL_INFO(curr, HWMON_C_INPUT | HWMON_C_MAX | HWMON_C_CRIT | HWMON_C_LABEL),
+	HWMON_CHANNEL_INFO(in, HWMON_I_INPUT | HWMON_I_CRIT | HWMON_I_LCRIT | HWMON_I_LABEL),
+			   NULL
+};
+
+static const struct hwmon_chip_info snet_hwmono_info = {
+	.ops = &snet_hwmon_ops,
+	.info = snet_hwmon_info,
+};
+
+/* Create an HW monitor device */
+void psnet_create_hwmon(struct pci_dev *pdev)
+{
+	struct device *hwmon;
+	struct psnet *psnet = pci_get_drvdata(pdev);
+
+	snprintf(psnet->hwmon_name, SNET_NAME_SIZE, "snet_%s", pci_name(pdev));
+	hwmon = devm_hwmon_device_register_with_info(&pdev->dev, psnet->hwmon_name, psnet,
+						     &snet_hwmono_info, NULL);
+	/* The monitor is not mandatory, Just alert user in case of an error */
+	if (IS_ERR(hwmon))
+		SNET_WARN(pdev, "Failed to create SNET hwmon, error %ld\n", PTR_ERR(hwmon));
+}

linux-7.2.3/drivers/vdpa/solidrun/snet_vdpa.h

@@ -0,0 +1,209 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * SolidRun DPU driver for control plane
+ *
+ * Copyright (C) 2022-2023 SolidRun
+ *
+ * Author: Alvaro Karsz <alvaro.karsz@solid-run.com>
+ *
+ */
+#ifndef _SNET_VDPA_H_
+#define _SNET_VDPA_H_
+
+#include <linux/vdpa.h>
+#include <linux/pci.h>
+
+#define SNET_NAME_SIZE 256
+
+#define SNET_ERR(pdev, fmt, ...) dev_err(&(pdev)->dev, "%s"fmt, "snet_vdpa: ", ##__VA_ARGS__)
+#define SNET_WARN(pdev, fmt, ...) dev_warn(&(pdev)->dev, "%s"fmt, "snet_vdpa: ", ##__VA_ARGS__)
+#define SNET_INFO(pdev, fmt, ...) dev_info(&(pdev)->dev, "%s"fmt, "snet_vdpa: ", ##__VA_ARGS__)
+#define SNET_DBG(pdev, fmt, ...) dev_dbg(&(pdev)->dev, "%s"fmt, "snet_vdpa: ", ##__VA_ARGS__)
+#define SNET_HAS_FEATURE(s, f) ((s)->negotiated_features & BIT_ULL(f))
+/* Check if negotiated config version is at least @ver */
+#define SNET_CFG_VER(snet, ver) ((snet)->psnet->negotiated_cfg_ver >= (ver))
+
+/* VQ struct */
+struct snet_vq {
+	/* VQ callback */
+	struct vdpa_callback cb;
+	/* VQ state received from bus */
+	struct vdpa_vq_state vq_state;
+	/* desc base address */
+	u64 desc_area;
+	/* device base address */
+	u64 device_area;
+	/* driver base address */
+	u64 driver_area;
+	/* Queue size */
+	u32 num;
+	/* Serial ID for VQ */
+	u32 sid;
+	/* is ready flag */
+	bool ready;
+	/* IRQ number */
+	u32 irq;
+	/* IRQ index, DPU uses this to parse data from MSI-X table */
+	u32 irq_idx;
+	/* IRQ name */
+	char irq_name[SNET_NAME_SIZE];
+	/* pointer to mapped PCI BAR register used by this VQ to kick */
+	void __iomem *kick_ptr;
+};
+
+struct snet {
+	/* vdpa device */
+	struct vdpa_device vdpa;
+	/* Config callback */
+	struct vdpa_callback cb;
+	/* To lock the control mechanism */
+	struct mutex ctrl_lock;
+	/* Spinlock to protect critical parts in the control mechanism */
+	spinlock_t ctrl_spinlock;
+	/* array of virqueues */
+	struct snet_vq **vqs;
+	/* Used features */
+	u64 negotiated_features;
+	/* Device serial ID */
+	u32 sid;
+	/* device status */
+	u8 status;
+	/* boolean indicating if snet config was passed to the device */
+	bool dpu_ready;
+	/* IRQ number */
+	u32 cfg_irq;
+	/* IRQ index, DPU uses this to parse data from MSI-X table */
+	u32 cfg_irq_idx;
+	/* IRQ name */
+	char cfg_irq_name[SNET_NAME_SIZE];
+	/* BAR to access the VF */
+	void __iomem *bar;
+	/* PCI device */
+	struct pci_dev *pdev;
+	/* Pointer to snet pdev parent device */
+	struct psnet *psnet;
+	/* Pointer to snet config device */
+	struct snet_dev_cfg *cfg;
+};
+
+struct snet_dev_cfg {
+	/* Device ID following VirtIO spec. */
+	u32 virtio_id;
+	/* Number of VQs for this device */
+	u32 vq_num;
+	/* Size of every VQ */
+	u32 vq_size;
+	/* Virtual Function id */
+	u32 vfid;
+	/* Device features, following VirtIO spec */
+	u64 features;
+	/* Reserved for future usage */
+	u32 rsvd[6];
+	/* VirtIO device specific config size */
+	u32 cfg_size;
+	/* VirtIO device specific config address */
+	void __iomem *virtio_cfg;
+} __packed;
+
+struct snet_cfg {
+	/* Magic key */
+	u32 key;
+	/* Size of total config in bytes */
+	u32 cfg_size;
+	/* Config version */
+	u32 cfg_ver;
+	/* Number of Virtual Functions to create */
+	u32 vf_num;
+	/* BAR to use for the VFs */
+	u32 vf_bar;
+	/* Where should we write the SNET's config */
+	u32 host_cfg_off;
+	/* Max. allowed size for a SNET's config */
+	u32 max_size_host_cfg;
+	/* VirtIO config offset in BAR */
+	u32 virtio_cfg_off;
+	/* Offset in PCI BAR for VQ kicks */
+	u32 kick_off;
+	/* Offset in PCI BAR for HW monitoring */
+	u32 hwmon_off;
+	/* Offset in PCI BAR for Control mechanism */
+	u32 ctrl_off;
+	/* Config general flags - enum snet_cfg_flags */
+	u32 flags;
+	/* Reserved for future usage */
+	u32 rsvd[6];
+	/* Number of snet devices */
+	u32 devices_num;
+	/* The actual devices */
+	struct snet_dev_cfg **devs;
+} __packed;
+
+/* SolidNET PCIe device, one device per PCIe physical function */
+struct psnet {
+	/* PCI BARs */
+	void __iomem *bars[PCI_STD_NUM_BARS];
+	/* Negotiated config version */
+	u32 negotiated_cfg_ver;
+	/* Next IRQ index to use in case when the IRQs are allocated from this device */
+	u32 next_irq;
+	/* BAR number used to communicate with the device */
+	u8 barno;
+	/* spinlock to protect data that can be changed by SNET devices */
+	spinlock_t lock;
+	/* Pointer to the device's config read from BAR */
+	struct snet_cfg cfg;
+	/* Name of monitor device */
+	char hwmon_name[SNET_NAME_SIZE];
+};
+
+enum snet_cfg_flags {
+	/* Create a HWMON device */
+	SNET_CFG_FLAG_HWMON = BIT(0),
+	/* USE IRQs from the physical function */
+	SNET_CFG_FLAG_IRQ_PF = BIT(1),
+};
+
+#define PSNET_FLAG_ON(p, f)	((p)->cfg.flags & (f))
+
+static inline u32 psnet_read32(struct psnet *psnet, u32 off)
+{
+	return ioread32(psnet->bars[psnet->barno] + off);
+}
+
+static inline u32 snet_read32(struct snet *snet, u32 off)
+{
+	return ioread32(snet->bar + off);
+}
+
+static inline void snet_write32(struct snet *snet, u32 off, u32 val)
+{
+	iowrite32(val, snet->bar + off);
+}
+
+static inline u64 psnet_read64(struct psnet *psnet, u32 off)
+{
+	u64 val;
+	/* 64bits are written in 2 halves, low part first */
+	val = (u64)psnet_read32(psnet, off);
+	val |= ((u64)psnet_read32(psnet, off + 4) << 32);
+	return val;
+}
+
+static inline void snet_write64(struct snet *snet, u32 off, u64 val)
+{
+	/* The DPU expects a 64bit integer in 2 halves, the low part first */
+	snet_write32(snet, off, (u32)val);
+	snet_write32(snet, off + 4, (u32)(val >> 32));
+}
+
+#if IS_ENABLED(CONFIG_HWMON)
+void psnet_create_hwmon(struct pci_dev *pdev);
+#endif
+
+void snet_ctrl_clear(struct snet *snet);
+int snet_destroy_dev(struct snet *snet);
+int snet_read_vq_state(struct snet *snet, u16 idx, struct vdpa_vq_state *state);
+int snet_suspend_dev(struct snet *snet);
+int snet_resume_dev(struct snet *snet);
+
+#endif //_SNET_VDPA_H_