drivers/vdpa/ifcvf/ifcvf_main.c - kernel/common - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Intel IFC VF NIC driver for virtio dataplane offloading
  *
  * Copyright (C) 2020 Intel Corporation.
  *
  * Author: Zhu Lingshan <lingshan.zhu@intel.com>
  *
  */

 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/sysfs.h>
 #include "ifcvf_base.h"

 #define VERSION_STRING  "0.1"
 #define DRIVER_AUTHOR   "Intel Corporation"
 #define IFCVF_DRIVER_NAME       "ifcvf"

 static irqreturn_t ifcvf_intr_handler(int irq, void *arg)
 {
 	struct vring_info *vring = arg;

 	if (vring->cb.callback)
 		return vring->cb.callback(vring->cb.private);

 	return IRQ_HANDLED;
 }

 static int ifcvf_start_datapath(void *private)
 {
 	struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
 	u8 status;
 	int ret;

 	vf->nr_vring = IFCVF_MAX_QUEUE_PAIRS * 2;
 	ret = ifcvf_start_hw(vf);
 	if (ret < 0) {
 		status = ifcvf_get_status(vf);
 		status |= VIRTIO_CONFIG_S_FAILED;
 		ifcvf_set_status(vf, status);
 	}

 	return ret;
 }

 static int ifcvf_stop_datapath(void *private)
 {
 	struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
 	int i;

 	for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++)
 		vf->vring[i].cb.callback = NULL;

 	ifcvf_stop_hw(vf);

 	return 0;
 }

 static void ifcvf_reset_vring(struct ifcvf_adapter *adapter)
 {
 	struct ifcvf_hw *vf = ifcvf_private_to_vf(adapter);
 	int i;

 	for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
 		vf->vring[i].last_avail_idx = 0;
 		vf->vring[i].desc = 0;
 		vf->vring[i].avail = 0;
 		vf->vring[i].used = 0;
 		vf->vring[i].ready = 0;
 		vf->vring[i].cb.callback = NULL;
 		vf->vring[i].cb.private = NULL;
 	}

 	ifcvf_reset(vf);
 }

 static struct ifcvf_adapter *vdpa_to_adapter(struct vdpa_device *vdpa_dev)
 {
 	return container_of(vdpa_dev, struct ifcvf_adapter, vdpa);
 }

 static struct ifcvf_hw *vdpa_to_vf(struct vdpa_device *vdpa_dev)
 {
 	struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);

 	return &adapter->vf;
 }

 static u64 ifcvf_vdpa_get_features(struct vdpa_device *vdpa_dev)
 {
 	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 	u64 features;

 	features = ifcvf_get_features(vf) & IFCVF_SUPPORTED_FEATURES;

 	return features;
 }

 static int ifcvf_vdpa_set_features(struct vdpa_device *vdpa_dev, u64 features)
 {
 	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

 	vf->req_features = features;

 	return 0;
 }

 static u8 ifcvf_vdpa_get_status(struct vdpa_device *vdpa_dev)
 {
 	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

 	return ifcvf_get_status(vf);
 }

 static void ifcvf_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
 {
 	struct ifcvf_adapter *adapter;
 	struct ifcvf_hw *vf;

 	vf  = vdpa_to_vf(vdpa_dev);
 	adapter = dev_get_drvdata(vdpa_dev->dev.parent);

 	if (status == 0) {
 		ifcvf_stop_datapath(adapter);
 		ifcvf_reset_vring(adapter);
 		return;
 	}

 	if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
 		if (ifcvf_start_datapath(adapter) < 0)
 			IFCVF_ERR(adapter->pdev,
 				  "Failed to set ifcvf vdpa  status %u\n",
 				  status);
 	}

 	ifcvf_set_status(vf, status);
 }

 static u16 ifcvf_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev)
 {
 	return IFCVF_QUEUE_MAX;
 }

 static u64 ifcvf_vdpa_get_vq_state(struct vdpa_device *vdpa_dev, u16 qid)
 {
 	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

 	return ifcvf_get_vq_state(vf, qid);
 }

 static int ifcvf_vdpa_set_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
 				   u64 num)
 {
 	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

 	return ifcvf_set_vq_state(vf, qid, num);
 }

 static void ifcvf_vdpa_set_vq_cb(struct vdpa_device *vdpa_dev, u16 qid,
 				 struct vdpa_callback *cb)
 {
 	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

 	vf->vring[qid].cb = *cb;
 }

 static void ifcvf_vdpa_set_vq_ready(struct vdpa_device *vdpa_dev,
 				    u16 qid, bool ready)
 {
 	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

 	vf->vring[qid].ready = ready;
 }

 static bool ifcvf_vdpa_get_vq_ready(struct vdpa_device *vdpa_dev, u16 qid)
 {
 	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

 	return vf->vring[qid].ready;
 }

 static void ifcvf_vdpa_set_vq_num(struct vdpa_device *vdpa_dev, u16 qid,
 				  u32 num)
 {
 	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

 	vf->vring[qid].size = num;
 }

 static int ifcvf_vdpa_set_vq_address(struct vdpa_device *vdpa_dev, u16 qid,
 				     u64 desc_area, u64 driver_area,
 				     u64 device_area)
 {
 	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

 	vf->vring[qid].desc = desc_area;
 	vf->vring[qid].avail = driver_area;
 	vf->vring[qid].used = device_area;

 	return 0;
 }

 static void ifcvf_vdpa_kick_vq(struct vdpa_device *vdpa_dev, u16 qid)
 {
 	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

 	ifcvf_notify_queue(vf, qid);
 }

 static u32 ifcvf_vdpa_get_generation(struct vdpa_device *vdpa_dev)
 {
 	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

 	return ioread8(&vf->common_cfg->config_generation);
 }

 static u32 ifcvf_vdpa_get_device_id(struct vdpa_device *vdpa_dev)
 {
 	return VIRTIO_ID_NET;
 }

 static u32 ifcvf_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)
 {
 	return IFCVF_SUBSYS_VENDOR_ID;
 }

 static u32 ifcvf_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
 {
 	return IFCVF_QUEUE_ALIGNMENT;
 }

 static void ifcvf_vdpa_get_config(struct vdpa_device *vdpa_dev,
 				  unsigned int offset,
 				  void *buf, unsigned int len)
 {
 	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

 	WARN_ON(offset + len > sizeof(struct virtio_net_config));
 	ifcvf_read_net_config(vf, offset, buf, len);
 }

 static void ifcvf_vdpa_set_config(struct vdpa_device *vdpa_dev,
 				  unsigned int offset, const void *buf,
 				  unsigned int len)
 {
 	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

 	WARN_ON(offset + len > sizeof(struct virtio_net_config));
 	ifcvf_write_net_config(vf, offset, buf, len);
 }

 static void ifcvf_vdpa_set_config_cb(struct vdpa_device *vdpa_dev,
 				     struct vdpa_callback *cb)
 {
 	/* We don't support config interrupt */
 }

 /*
  * IFCVF currently does't have on-chip IOMMU, so not
  * implemented set_map()/dma_map()/dma_unmap()
  */
 static const struct vdpa_config_ops ifc_vdpa_ops = {
 	.get_features	= ifcvf_vdpa_get_features,
 	.set_features	= ifcvf_vdpa_set_features,
 	.get_status	= ifcvf_vdpa_get_status,
 	.set_status	= ifcvf_vdpa_set_status,
 	.get_vq_num_max	= ifcvf_vdpa_get_vq_num_max,
 	.get_vq_state	= ifcvf_vdpa_get_vq_state,
 	.set_vq_state	= ifcvf_vdpa_set_vq_state,
 	.set_vq_cb	= ifcvf_vdpa_set_vq_cb,
 	.set_vq_ready	= ifcvf_vdpa_set_vq_ready,
 	.get_vq_ready	= ifcvf_vdpa_get_vq_ready,
 	.set_vq_num	= ifcvf_vdpa_set_vq_num,
 	.set_vq_address	= ifcvf_vdpa_set_vq_address,
 	.kick_vq	= ifcvf_vdpa_kick_vq,
 	.get_generation	= ifcvf_vdpa_get_generation,
 	.get_device_id	= ifcvf_vdpa_get_device_id,
 	.get_vendor_id	= ifcvf_vdpa_get_vendor_id,
 	.get_vq_align	= ifcvf_vdpa_get_vq_align,
 	.get_config	= ifcvf_vdpa_get_config,
 	.set_config	= ifcvf_vdpa_set_config,
 	.set_config_cb  = ifcvf_vdpa_set_config_cb,
 };

 static int ifcvf_request_irq(struct ifcvf_adapter *adapter)
 {
 	struct pci_dev *pdev = adapter->pdev;
 	struct ifcvf_hw *vf = &adapter->vf;
 	int vector, i, ret, irq;


 	for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
 		snprintf(vf->vring[i].msix_name, 256, "ifcvf[%s]-%d\n",
 			 pci_name(pdev), i);
 		vector = i + IFCVF_MSI_QUEUE_OFF;
 		irq = pci_irq_vector(pdev, vector);
 		ret = devm_request_irq(&pdev->dev, irq,
 				       ifcvf_intr_handler, 0,
 				       vf->vring[i].msix_name,
 				       &vf->vring[i]);
 		if (ret) {
 			IFCVF_ERR(pdev,
 				  "Failed to request irq for vq %d\n", i);
 			return ret;
 		}
 		vf->vring[i].irq = irq;
 	}

 	return 0;
 }

 static void ifcvf_free_irq_vectors(void *data)
 {
 	pci_free_irq_vectors(data);
 }

 static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct device *dev = &pdev->dev;
 	struct ifcvf_adapter *adapter;
 	struct ifcvf_hw *vf;
 	int ret;

 	ret = pcim_enable_device(pdev);
 	if (ret) {
 		IFCVF_ERR(pdev, "Failed to enable device\n");
 		return ret;
 	}

 	ret = pcim_iomap_regions(pdev, BIT(0) | BIT(2) | BIT(4),
 				 IFCVF_DRIVER_NAME);
 	if (ret) {
 		IFCVF_ERR(pdev, "Failed to request MMIO region\n");
 		return ret;
 	}

 	ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
 	if (ret) {
 		IFCVF_ERR(pdev, "No usable DMA confiugration\n");
 		return ret;
 	}

 	ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
 	if (ret) {
 		IFCVF_ERR(pdev,
 			  "No usable coherent DMA confiugration\n");
 		return ret;
 	}

 	ret = pci_alloc_irq_vectors(pdev, IFCVF_MAX_INTR,
 				    IFCVF_MAX_INTR, PCI_IRQ_MSIX);
 	if (ret < 0) {
 		IFCVF_ERR(pdev, "Failed to alloc irq vectors\n");
 		return ret;
 	}

 	ret = devm_add_action_or_reset(dev, ifcvf_free_irq_vectors, pdev);
 	if (ret) {
 		IFCVF_ERR(pdev,
 			  "Failed for adding devres for freeing irq vectors\n");
 		return ret;
 	}

 	adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa,
 				    dev, &ifc_vdpa_ops);
 	if (adapter == NULL) {
 		IFCVF_ERR(pdev, "Failed to allocate vDPA structure");
 		return -ENOMEM;
 	}

 	pci_set_master(pdev);
 	pci_set_drvdata(pdev, adapter);

 	vf = &adapter->vf;
 	vf->base = pcim_iomap_table(pdev);

 	adapter->pdev = pdev;
 	adapter->vdpa.dma_dev = &pdev->dev;

 	ret = ifcvf_request_irq(adapter);
 	if (ret) {
 		IFCVF_ERR(pdev, "Failed to request MSI-X irq\n");
 		goto err;
 	}

 	ret = ifcvf_init_hw(vf, pdev);
 	if (ret) {
 		IFCVF_ERR(pdev, "Failed to init IFCVF hw\n");
 		goto err;
 	}

 	ret = vdpa_register_device(&adapter->vdpa);
 	if (ret) {
 		IFCVF_ERR(pdev, "Failed to register ifcvf to vdpa bus");
 		goto err;
 	}

 	return 0;

 err:
 	put_device(&adapter->vdpa.dev);
 	return ret;
 }

 static void ifcvf_remove(struct pci_dev *pdev)
 {
 	struct ifcvf_adapter *adapter = pci_get_drvdata(pdev);

 	vdpa_unregister_device(&adapter->vdpa);
 }

 static struct pci_device_id ifcvf_pci_ids[] = {
 	{ PCI_DEVICE_SUB(IFCVF_VENDOR_ID,
 		IFCVF_DEVICE_ID,
 		IFCVF_SUBSYS_VENDOR_ID,
 		IFCVF_SUBSYS_DEVICE_ID) },
 	{ 0 },
 };
 MODULE_DEVICE_TABLE(pci, ifcvf_pci_ids);

 static struct pci_driver ifcvf_driver = {
 	.name     = IFCVF_DRIVER_NAME,
 	.id_table = ifcvf_pci_ids,
 	.probe    = ifcvf_probe,
 	.remove   = ifcvf_remove,
 };

 module_pci_driver(ifcvf_driver);

 MODULE_LICENSE("GPL v2");
 MODULE_VERSION(VERSION_STRING);
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Intel IFC VF NIC driver for virtio dataplane offloading
	*
	* Copyright (C) 2020 Intel Corporation.
	*
	* Author: Zhu Lingshan <lingshan.zhu@intel.com>
	*
	*/

	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/pci.h>
	#include <linux/sysfs.h>
	#include "ifcvf_base.h"

	#define VERSION_STRING "0.1"
	#define DRIVER_AUTHOR "Intel Corporation"
	#define IFCVF_DRIVER_NAME "ifcvf"

	static irqreturn_t ifcvf_intr_handler(int irq, void *arg)
	{
	struct vring_info *vring = arg;

	if (vring->cb.callback)
	return vring->cb.callback(vring->cb.private);

	return IRQ_HANDLED;
	}

	static int ifcvf_start_datapath(void *private)
	{
	struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
	u8 status;
	int ret;

	vf->nr_vring = IFCVF_MAX_QUEUE_PAIRS * 2;
	ret = ifcvf_start_hw(vf);
	if (ret < 0) {
	status = ifcvf_get_status(vf);
	status \|= VIRTIO_CONFIG_S_FAILED;
	ifcvf_set_status(vf, status);
	}

	return ret;
	}

	static int ifcvf_stop_datapath(void *private)
	{
	struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
	int i;

	for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++)
	vf->vring[i].cb.callback = NULL;

	ifcvf_stop_hw(vf);

	return 0;
	}

	static void ifcvf_reset_vring(struct ifcvf_adapter *adapter)
	{
	struct ifcvf_hw *vf = ifcvf_private_to_vf(adapter);
	int i;

	for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
	vf->vring[i].last_avail_idx = 0;
	vf->vring[i].desc = 0;
	vf->vring[i].avail = 0;
	vf->vring[i].used = 0;
	vf->vring[i].ready = 0;
	vf->vring[i].cb.callback = NULL;
	vf->vring[i].cb.private = NULL;
	}

	ifcvf_reset(vf);
	}

	static struct ifcvf_adapter vdpa_to_adapter(struct vdpa_device vdpa_dev)
	{
	return container_of(vdpa_dev, struct ifcvf_adapter, vdpa);
	}

	static struct ifcvf_hw vdpa_to_vf(struct vdpa_device vdpa_dev)
	{
	struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);

	return &adapter->vf;
	}

	static u64 ifcvf_vdpa_get_features(struct vdpa_device *vdpa_dev)
	{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
	u64 features;

	features = ifcvf_get_features(vf) & IFCVF_SUPPORTED_FEATURES;

	return features;
	}

	static int ifcvf_vdpa_set_features(struct vdpa_device *vdpa_dev, u64 features)
	{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	vf->req_features = features;

	return 0;
	}

	static u8 ifcvf_vdpa_get_status(struct vdpa_device *vdpa_dev)
	{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	return ifcvf_get_status(vf);
	}

	static void ifcvf_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
	{
	struct ifcvf_adapter *adapter;
	struct ifcvf_hw *vf;

	vf = vdpa_to_vf(vdpa_dev);
	adapter = dev_get_drvdata(vdpa_dev->dev.parent);

	if (status == 0) {
	ifcvf_stop_datapath(adapter);
	ifcvf_reset_vring(adapter);
	return;
	}

	if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
	if (ifcvf_start_datapath(adapter) < 0)
	IFCVF_ERR(adapter->pdev,
	"Failed to set ifcvf vdpa status %u\n",
	status);
	}

	ifcvf_set_status(vf, status);
	}

	static u16 ifcvf_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev)
	{
	return IFCVF_QUEUE_MAX;
	}

	static u64 ifcvf_vdpa_get_vq_state(struct vdpa_device *vdpa_dev, u16 qid)
	{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	return ifcvf_get_vq_state(vf, qid);
	}

	static int ifcvf_vdpa_set_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
	u64 num)
	{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	return ifcvf_set_vq_state(vf, qid, num);
	}

	static void ifcvf_vdpa_set_vq_cb(struct vdpa_device *vdpa_dev, u16 qid,
	struct vdpa_callback *cb)
	{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	vf->vring[qid].cb = *cb;
	}

	static void ifcvf_vdpa_set_vq_ready(struct vdpa_device *vdpa_dev,
	u16 qid, bool ready)
	{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	vf->vring[qid].ready = ready;
	}

	static bool ifcvf_vdpa_get_vq_ready(struct vdpa_device *vdpa_dev, u16 qid)
	{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	return vf->vring[qid].ready;
	}

	static void ifcvf_vdpa_set_vq_num(struct vdpa_device *vdpa_dev, u16 qid,
	u32 num)
	{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	vf->vring[qid].size = num;
	}

	static int ifcvf_vdpa_set_vq_address(struct vdpa_device *vdpa_dev, u16 qid,
	u64 desc_area, u64 driver_area,
	u64 device_area)
	{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	vf->vring[qid].desc = desc_area;
	vf->vring[qid].avail = driver_area;
	vf->vring[qid].used = device_area;

	return 0;
	}

	static void ifcvf_vdpa_kick_vq(struct vdpa_device *vdpa_dev, u16 qid)
	{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	ifcvf_notify_queue(vf, qid);
	}

	static u32 ifcvf_vdpa_get_generation(struct vdpa_device *vdpa_dev)
	{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	return ioread8(&vf->common_cfg->config_generation);
	}

	static u32 ifcvf_vdpa_get_device_id(struct vdpa_device *vdpa_dev)
	{
	return VIRTIO_ID_NET;
	}

	static u32 ifcvf_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)
	{
	return IFCVF_SUBSYS_VENDOR_ID;
	}

	static u32 ifcvf_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
	{
	return IFCVF_QUEUE_ALIGNMENT;
	}

	static void ifcvf_vdpa_get_config(struct vdpa_device *vdpa_dev,
	unsigned int offset,
	void *buf, unsigned int len)
	{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	WARN_ON(offset + len > sizeof(struct virtio_net_config));
	ifcvf_read_net_config(vf, offset, buf, len);
	}

	static void ifcvf_vdpa_set_config(struct vdpa_device *vdpa_dev,
	unsigned int offset, const void *buf,
	unsigned int len)
	{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	WARN_ON(offset + len > sizeof(struct virtio_net_config));
	ifcvf_write_net_config(vf, offset, buf, len);
	}

	static void ifcvf_vdpa_set_config_cb(struct vdpa_device *vdpa_dev,
	struct vdpa_callback *cb)
	{
	/* We don't support config interrupt */
	}

	/*
	* IFCVF currently does't have on-chip IOMMU, so not
	* implemented set_map()/dma_map()/dma_unmap()
	*/
	static const struct vdpa_config_ops ifc_vdpa_ops = {
	.get_features = ifcvf_vdpa_get_features,
	.set_features = ifcvf_vdpa_set_features,
	.get_status = ifcvf_vdpa_get_status,
	.set_status = ifcvf_vdpa_set_status,
	.get_vq_num_max = ifcvf_vdpa_get_vq_num_max,
	.get_vq_state = ifcvf_vdpa_get_vq_state,
	.set_vq_state = ifcvf_vdpa_set_vq_state,
	.set_vq_cb = ifcvf_vdpa_set_vq_cb,
	.set_vq_ready = ifcvf_vdpa_set_vq_ready,
	.get_vq_ready = ifcvf_vdpa_get_vq_ready,
	.set_vq_num = ifcvf_vdpa_set_vq_num,
	.set_vq_address = ifcvf_vdpa_set_vq_address,
	.kick_vq = ifcvf_vdpa_kick_vq,
	.get_generation = ifcvf_vdpa_get_generation,
	.get_device_id = ifcvf_vdpa_get_device_id,
	.get_vendor_id = ifcvf_vdpa_get_vendor_id,
	.get_vq_align = ifcvf_vdpa_get_vq_align,
	.get_config = ifcvf_vdpa_get_config,
	.set_config = ifcvf_vdpa_set_config,
	.set_config_cb = ifcvf_vdpa_set_config_cb,
	};

	static int ifcvf_request_irq(struct ifcvf_adapter *adapter)
	{
	struct pci_dev *pdev = adapter->pdev;
	struct ifcvf_hw *vf = &adapter->vf;
	int vector, i, ret, irq;


	for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
	snprintf(vf->vring[i].msix_name, 256, "ifcvf[%s]-%d\n",
	pci_name(pdev), i);
	vector = i + IFCVF_MSI_QUEUE_OFF;
	irq = pci_irq_vector(pdev, vector);
	ret = devm_request_irq(&pdev->dev, irq,
	ifcvf_intr_handler, 0,
	vf->vring[i].msix_name,
	&vf->vring[i]);
	if (ret) {
	IFCVF_ERR(pdev,
	"Failed to request irq for vq %d\n", i);
	return ret;
	}
	vf->vring[i].irq = irq;
	}

	return 0;
	}

	static void ifcvf_free_irq_vectors(void *data)
	{
	pci_free_irq_vectors(data);
	}

	static int ifcvf_probe(struct pci_dev pdev, const struct pci_device_id id)
	{
	struct device *dev = &pdev->dev;
	struct ifcvf_adapter *adapter;
	struct ifcvf_hw *vf;
	int ret;

	ret = pcim_enable_device(pdev);
	if (ret) {
	IFCVF_ERR(pdev, "Failed to enable device\n");
	return ret;
	}

	ret = pcim_iomap_regions(pdev, BIT(0) \| BIT(2) \| BIT(4),
	IFCVF_DRIVER_NAME);
	if (ret) {
	IFCVF_ERR(pdev, "Failed to request MMIO region\n");
	return ret;
	}

	ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
	if (ret) {
	IFCVF_ERR(pdev, "No usable DMA confiugration\n");
	return ret;
	}

	ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
	if (ret) {
	IFCVF_ERR(pdev,
	"No usable coherent DMA confiugration\n");
	return ret;
	}

	ret = pci_alloc_irq_vectors(pdev, IFCVF_MAX_INTR,
	IFCVF_MAX_INTR, PCI_IRQ_MSIX);
	if (ret < 0) {
	IFCVF_ERR(pdev, "Failed to alloc irq vectors\n");
	return ret;
	}

	ret = devm_add_action_or_reset(dev, ifcvf_free_irq_vectors, pdev);
	if (ret) {
	IFCVF_ERR(pdev,
	"Failed for adding devres for freeing irq vectors\n");
	return ret;
	}

	adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa,
	dev, &ifc_vdpa_ops);
	if (adapter == NULL) {
	IFCVF_ERR(pdev, "Failed to allocate vDPA structure");
	return -ENOMEM;
	}

	pci_set_master(pdev);
	pci_set_drvdata(pdev, adapter);

	vf = &adapter->vf;
	vf->base = pcim_iomap_table(pdev);

	adapter->pdev = pdev;
	adapter->vdpa.dma_dev = &pdev->dev;

	ret = ifcvf_request_irq(adapter);
	if (ret) {
	IFCVF_ERR(pdev, "Failed to request MSI-X irq\n");
	goto err;
	}

	ret = ifcvf_init_hw(vf, pdev);
	if (ret) {
	IFCVF_ERR(pdev, "Failed to init IFCVF hw\n");
	goto err;
	}

	ret = vdpa_register_device(&adapter->vdpa);
	if (ret) {
	IFCVF_ERR(pdev, "Failed to register ifcvf to vdpa bus");
	goto err;
	}

	return 0;

	err:
	put_device(&adapter->vdpa.dev);
	return ret;
	}

	static void ifcvf_remove(struct pci_dev *pdev)
	{
	struct ifcvf_adapter *adapter = pci_get_drvdata(pdev);

	vdpa_unregister_device(&adapter->vdpa);
	}

	static struct pci_device_id ifcvf_pci_ids[] = {
	{ PCI_DEVICE_SUB(IFCVF_VENDOR_ID,
	IFCVF_DEVICE_ID,
	IFCVF_SUBSYS_VENDOR_ID,
	IFCVF_SUBSYS_DEVICE_ID) },
	{ 0 },
	};
	MODULE_DEVICE_TABLE(pci, ifcvf_pci_ids);

	static struct pci_driver ifcvf_driver = {
	.name = IFCVF_DRIVER_NAME,
	.id_table = ifcvf_pci_ids,
	.probe = ifcvf_probe,
	.remove = ifcvf_remove,
	};

	module_pci_driver(ifcvf_driver);

	MODULE_LICENSE("GPL v2");
	MODULE_VERSION(VERSION_STRING);