Re: [RFC 2/2] vhost: IFC VF vdpa layer

[Zhu, Lingshan]

Hello Jason,

Thanks for your comments, I am on a conference travel, I will reply next 
Monday.

Thanks,
BR
Zhu Lingshan
On 10/16/2019 6:19 PM, Jason Wang wrote:
> On 2019/10/16 äå9:30, Zhu Lingshan wrote:
> > This commit introduced IFC VF operations for vdpa, which complys to
> > vhost_mdev interfaces, handles IFC VF initialization,
> > configuration and removal.
> >
> > Signed-off-by: Zhu Lingshan <lingshan.zhu@xxxxxxxxx>
> > ---
> > Â drivers/vhost/ifcvf/ifcvf_main.c | 541 
> > +++++++++++++++++++++++++++++++++++++++
> > Â 1 file changed, 541 insertions(+)
> > Â create mode 100644 drivers/vhost/ifcvf/ifcvf_main.c
> >
> > diff --git a/drivers/vhost/ifcvf/ifcvf_main.c 
> > b/drivers/vhost/ifcvf/ifcvf_main.c
> > new file mode 100644
> > index 000000000000..c48a29969a85
> > --- /dev/null
> > +++ b/drivers/vhost/ifcvf/ifcvf_main.c
> > @@ -0,0 +1,541 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * Copyright (C) 2019 Intel Corporation.
> > + */
> > +
> > +#include <linux/interrupt.h>
> > +#include <linux/module.h>
> > +#include <linux/mdev.h>
> > +#include <linux/pci.h>
> > +#include <linux/sysfs.h>
> > +
> > +#include "ifcvf_base.h"
> > +
> > +#define VERSION_STRINGÂÂÂ "0.1"
> > +#define DRIVER_AUTHORÂÂÂ "Intel Corporation"
> > +#define IFCVF_DRIVER_NAMEÂÂÂ "ifcvf"
> > +
> > +static irqreturn_t ifcvf_intr_handler(int irq, void *arg)
> > +{
> > +ÂÂÂ struct vring_info *vring = arg;
> > +
> > +ÂÂÂ if (vring->cb.callback)
> > +ÂÂÂÂÂÂÂ return vring->cb.callback(vring->cb.private);
> > +
> > +ÂÂÂ return IRQ_HANDLED;
> > +}
> > +
> > +static u64 ifcvf_mdev_get_features(struct mdev_device *mdev)
> > +{
> > +ÂÂÂ return IFC_SUPPORTED_FEATURES;
>
>
> I would expect this should be done by querying the hw. Or IFC VF can't 
> get any update through its firmware?
>
>
> > +}
> > +
> > +static int ifcvf_mdev_set_features(struct mdev_device *mdev, u64 
> > features)
> > +{
> > +ÂÂÂ struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev);
> > +ÂÂÂ struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter);
> > +
> > +ÂÂÂ vf->req_features = features;
> > +
> > +ÂÂÂ return 0;
> > +}
> > +
> > +static u64 ifcvf_mdev_get_vq_state(struct mdev_device *mdev, u16 qid)
> > +{
> > +ÂÂÂ struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev);
> > +ÂÂÂ struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter);
> > +
> > +ÂÂÂ return vf->vring[qid].last_avail_idx;
>
>
> Does this really work? I'd expect it should be fetched from hw since 
> it's an internal state.
>
>
> > +}
> > +
> > +static int ifcvf_mdev_set_vq_state(struct mdev_device *mdev, u16 
> > qid, u64 num)
> > +{
> > +ÂÂÂ struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev);
> > +ÂÂÂ struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter);
> > +
> > +ÂÂÂ vf->vring[qid].last_used_idx = num;
>
>
> I fail to understand why last_used_idx is needed. It looks to me the 
> used idx in the used ring is sufficient.
>
>
> > +ÂÂÂ vf->vring[qid].last_avail_idx = num;
>
>
> Do we need a synchronization with hw immediately here?
>
>
> > +
> > +ÂÂÂ return 0;
> > +}
> > +
> > +static int ifcvf_mdev_set_vq_address(struct mdev_device *mdev, u16 idx,
> > +ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ u64 desc_area, u64 driver_area,
> > +ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ u64 device_area)
> > +{
> > +ÂÂÂ struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev);
> > +ÂÂÂ struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter);
> > +
> > +ÂÂÂ vf->vring[idx].desc = desc_area;
> > +ÂÂÂ vf->vring[idx].avail = driver_area;
> > +ÂÂÂ vf->vring[idx].used = device_area;
> > +
> > +ÂÂÂ return 0;
> > +}
> > +
> > +static void ifcvf_mdev_set_vq_num(struct mdev_device *mdev, u16 qid, 
> > u32 num)
> > +{
> > +ÂÂÂ struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev);
> > +ÂÂÂ struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter);
> > +
> > +ÂÂÂ vf->vring[qid].size = num;
> > +}
> > +
> > +static void ifcvf_mdev_set_vq_ready(struct mdev_device *mdev,
> > +ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ u16 qid, bool ready)
> > +{
> > +
> > +ÂÂÂ struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev);
> > +ÂÂÂ struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter);
> > +
> > +ÂÂÂ vf->vring[qid].ready = ready;
> > +}
> > +
> > +static bool ifcvf_mdev_get_vq_ready(struct mdev_device *mdev, u16 qid)
> > +{
> > +
> > +ÂÂÂ struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev);
> > +ÂÂÂ struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter);
> > +
> > +ÂÂÂ return vf->vring[qid].ready;
> > +}
> > +
> > +static void ifcvf_mdev_set_vq_cb(struct mdev_device *mdev, u16 idx,
> > +ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ struct virtio_mdev_callback *cb)
> > +{
> > +ÂÂÂ struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev);
> > +ÂÂÂ struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter);
> > +
> > +ÂÂÂ vf->vring[idx].cb = *cb;
> > +}
> > +
> > +static void ifcvf_mdev_kick_vq(struct mdev_device *mdev, u16 idx)
> > +{
> > +ÂÂÂ struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev);
> > +ÂÂÂ struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter);
> > +
> > +ÂÂÂ ifcvf_notify_queue(vf, idx);
> > +}
> > +
> > +static u8 ifcvf_mdev_get_status(struct mdev_device *mdev)
> > +{
> > +ÂÂÂ struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev);
> > +ÂÂÂ struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter);
> > +
> > +ÂÂÂ return vf->status;
> > +}
> > +
> > +static u32 ifcvf_mdev_get_generation(struct mdev_device *mdev)
> > +{
> > +ÂÂÂ struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev);
> > +ÂÂÂ struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter);
> > +
> > +ÂÂÂ return vf->generation;
> > +}
> > +
> > +static int ifcvf_mdev_get_version(struct mdev_device *mdev)
> > +{
> > +ÂÂÂ return VIRTIO_MDEV_VERSION;
> > +}
> > +
> > +static u32 ifcvf_mdev_get_device_id(struct mdev_device *mdev)
> > +{
> > +ÂÂÂ return IFCVF_DEVICE_ID;
> > +}
> > +
> > +static u32 ifcvf_mdev_get_vendor_id(struct mdev_device *mdev)
> > +{
> > +ÂÂÂ return IFCVF_VENDOR_ID;
> > +}
> > +
> > +static u16 ifcvf_mdev_get_vq_align(struct mdev_device *mdev)
> > +{
> > +ÂÂÂ return IFCVF_QUEUE_ALIGNMENT;
> > +}
> > +
> > +static int ifcvf_start_datapath(void *private)
> > +{
> > +ÂÂÂ int i, ret;
> > +ÂÂÂ struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(private);
> > +
> > +ÂÂÂ for (i = 0; i < (IFCVF_MAX_QUEUE_PAIRS * 2); i++) {
> > +ÂÂÂÂÂÂÂ if (!vf->vring[i].ready)
> > +ÂÂÂÂÂÂÂÂÂÂÂ break;
>
>
> Looks like error should be returned here?
>
>
> > +
> > +ÂÂÂÂÂÂÂ if (!vf->vring[i].size)
> > +ÂÂÂÂÂÂÂÂÂÂÂ break;
> > +
> > +ÂÂÂÂÂÂÂ if (!vf->vring[i].desc || !vf->vring[i].avail ||
> > +ÂÂÂÂÂÂÂÂÂÂÂ !vf->vring[i].used)
> > +ÂÂÂÂÂÂÂÂÂÂÂ break;
> > +ÂÂÂ }
> > +ÂÂÂ vf->nr_vring = i;
> > +
> > +ÂÂÂ ret = ifcvf_start_hw(vf);
> > +ÂÂÂ return ret;
> > +}
> > +
> > +static int ifcvf_stop_datapath(void *private)
> > +{
> > +ÂÂÂ struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(private);
> > +ÂÂÂ int i;
> > +
> > +ÂÂÂ for (i = 0; i < IFCVF_MAX_QUEUES; i++)
> > +ÂÂÂÂÂÂÂ vf->vring[i].cb.callback = NULL;
>
>
> Any synchronization is needed for the vq irq handler?
>
>
> > +
> > +ÂÂÂ ifcvf_stop_hw(vf);
> > +
> > +ÂÂÂ return 0;
> > +}
> > +
> > +static void ifcvf_reset_vring(struct ifcvf_adapter *adapter)
> > +{
> > +ÂÂÂ int i;
> > +ÂÂÂ struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter);
> > +
> > +ÂÂÂ for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
> > +ÂÂÂÂÂÂÂ vf->vring[i].last_used_idx = 0;
> > +ÂÂÂÂÂÂÂ vf->vring[i].last_avail_idx = 0;
> > +ÂÂÂÂÂÂÂ vf->vring[i].desc = 0;
> > +ÂÂÂÂÂÂÂ vf->vring[i].avail = 0;
> > +ÂÂÂÂÂÂÂ vf->vring[i].used = 0;
> > +ÂÂÂÂÂÂÂ vf->vring[i].ready = 0;
> > +ÂÂÂÂÂÂÂ vf->vring->cb.callback = NULL;
> > +ÂÂÂÂÂÂÂ vf->vring->cb.private = NULL;
> > +ÂÂÂ }
> > +}
> > +
> > +static void ifcvf_mdev_set_status(struct mdev_device *mdev, u8 status)
> > +{
> > +ÂÂÂ struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev);
> > +ÂÂÂ struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter);
> > +
> > +ÂÂÂ vf->status = status;
> > +
> > +ÂÂÂ if (status == 0) {
> > +ÂÂÂÂÂÂÂ ifcvf_stop_datapath(adapter);
> > +ÂÂÂÂÂÂÂ ifcvf_reset_vring(adapter);
> > +ÂÂÂÂÂÂÂ return;
> > +ÂÂÂ }
> > +
> > +ÂÂÂ if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
> > +ÂÂÂÂÂÂÂ ifcvf_start_datapath(adapter);
> > +ÂÂÂÂÂÂÂ return;
> > +ÂÂÂ }
> > +}
> > +
> > +static u16 ifcvf_mdev_get_queue_max(struct mdev_device *mdev)
> > +{
> > +ÂÂÂ return IFCVF_MAX_QUEUES;
>
>
> The name is confusing, it was used to return the maximum queue size. 
> In new version of virtio-mdev, the callback was renamed as 
> get_vq_num_max().
>
>
> > +}
> > +
> > +static struct virtio_mdev_device_ops ifc_mdev_ops = {
> > + .get_features = ifcvf_mdev_get_features,
> > + .set_features = ifcvf_mdev_set_features,
> > +ÂÂÂ .get_statusÂÂÂ = ifcvf_mdev_get_status,
> > +ÂÂÂ .set_statusÂÂÂ = ifcvf_mdev_set_status,
> > +ÂÂÂ .get_queue_max = ifcvf_mdev_get_queue_max,
> > +ÂÂÂ .get_vq_stateÂÂ = ifcvf_mdev_get_vq_state,
> > +ÂÂÂ .set_vq_stateÂÂ = ifcvf_mdev_set_vq_state,
> > +ÂÂÂ .set_vq_cbÂÂÂÂÂ = ifcvf_mdev_set_vq_cb,
> > +ÂÂÂ .set_vq_readyÂÂ = ifcvf_mdev_set_vq_ready,
> > +ÂÂÂ .get_vq_readyÂÂÂ = ifcvf_mdev_get_vq_ready,
> > +ÂÂÂ .set_vq_numÂÂÂÂ = ifcvf_mdev_set_vq_num,
> > +ÂÂÂ .set_vq_address = ifcvf_mdev_set_vq_address,
> > +ÂÂÂ .kick_vqÂÂÂÂÂÂÂ = ifcvf_mdev_kick_vq,
> > +ÂÂÂ .get_generationÂÂÂ = ifcvf_mdev_get_generation,
> > +ÂÂÂ .get_versionÂÂÂ = ifcvf_mdev_get_version,
> > +ÂÂÂ .get_device_idÂÂÂ = ifcvf_mdev_get_device_id,
> > +ÂÂÂ .get_vendor_idÂÂÂ = ifcvf_mdev_get_vendor_id,
> > +ÂÂÂ .get_vq_alignÂÂÂ = ifcvf_mdev_get_vq_align,
> > +};
>
>
> set_config/get_config is missing. It looks to me they are not hard, 
> just implementing the access to dev_cfg. It's key to make kernel 
> virtio driver to work.
>
> And in the new version of virito-mdev, features like _F_LOG_ALL should 
> be advertised through get_mdev_features.
>
>
> > +
> > +static int ifcvf_init_msix(struct ifcvf_adapter *adapter)
> > +{
> > +ÂÂÂ int vector, i, ret, irq;
> > +ÂÂÂ struct pci_dev *pdev = to_pci_dev(adapter->dev);
> > +ÂÂÂ struct ifcvf_hw *vf = &adapter->vf;
> > +
> > +ÂÂÂ ret = pci_alloc_irq_vectors(pdev, IFCVF_MAX_INTR,
> > +ÂÂÂÂÂÂÂÂÂÂÂ IFCVF_MAX_INTR, PCI_IRQ_MSIX);
> > +ÂÂÂ if (ret < 0) {
> > +ÂÂÂÂÂÂÂ IFC_ERR(adapter->dev, "Failed to alloc irq vectors.\n");
> > +ÂÂÂÂÂÂÂ return ret;
> > +ÂÂÂ }
> > +
> > +ÂÂÂ for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
> > +ÂÂÂÂÂÂÂ vector = i + IFCVF_MSI_QUEUE_OFF;
> > +ÂÂÂÂÂÂÂ irq = pci_irq_vector(pdev, vector);
> > +ÂÂÂÂÂÂÂ ret = request_irq(irq, ifcvf_intr_handler, 0,
> > +ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ pci_name(pdev), &vf->vring[i]);
> > +ÂÂÂÂÂÂÂ if (ret) {
> > +ÂÂÂÂÂÂÂÂÂÂÂ IFC_ERR(adapter->dev,
> > +ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ "Failed to request irq for vq %d.\n", i);
> > +ÂÂÂÂÂÂÂÂÂÂÂ return ret;
> > +ÂÂÂÂÂÂÂ }
> > +ÂÂÂ }
>
>
> Do we need to provide fallback when we can't do per vq MSIX?
>
>
> > +
> > +ÂÂÂ return 0;
> > +}
> > +
> > +static void ifcvf_destroy_adapter(struct ifcvf_adapter *adapter)
> > +{
> > +ÂÂÂ int i, vector, irq;
> > +ÂÂÂ struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter);
> > +ÂÂÂ struct pci_dev *pdev = to_pci_dev(adapter->dev);
> > +
> > +ÂÂÂ for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
> > +ÂÂÂÂÂÂÂ vector = i + IFCVF_MSI_QUEUE_OFF;
> > +ÂÂÂÂÂÂÂ irq = pci_irq_vector(pdev, vector);
> > +ÂÂÂÂÂÂÂ free_irq(irq, &vf->vring[i]);
> > +ÂÂÂ }
> > +}
> > +
> > +static ssize_t name_show(struct kobject *kobj, struct device *dev, 
> > char *buf)
> > +{
> > +ÂÂÂ const char *name = "vhost accelerator (virtio ring compatible)";
> > +
> > +ÂÂÂ return sprintf(buf, "%s\n", name);
> > +}
> > +MDEV_TYPE_ATTR_RO(name);
> > +
> > +static ssize_t device_api_show(struct kobject *kobj, struct device 
> > *dev,
> > +ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ char *buf)
> > +{
> > +ÂÂÂ return sprintf(buf, "%s\n", VIRTIO_MDEV_DEVICE_API_STRING);
> > +}
> > +MDEV_TYPE_ATTR_RO(device_api);
> > +
> > +static ssize_t available_instances_show(struct kobject *kobj,
> > +ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ struct device *dev, char *buf)
> > +{
> > +ÂÂÂ struct pci_dev *pdev = to_pci_dev(dev);
> > +ÂÂÂ struct ifcvf_adapter *adapter = pci_get_drvdata(pdev);
> > +
> > +ÂÂÂ return sprintf(buf, "%d\n", adapter->mdev_count);
> > +}
> > +
> > +MDEV_TYPE_ATTR_RO(available_instances);
> > +
> > +static ssize_t type_show(struct kobject *kobj,
> > +ÂÂÂÂÂÂÂÂÂÂÂ struct device *dev, char *buf)
> > +{
> > +ÂÂÂ return sprintf(buf, "%s\n", "net");
> > +}
> > +
> > +MDEV_TYPE_ATTR_RO(type);
> > +
> > +
> > +static struct attribute *mdev_types_attrs[] = {
> > +ÂÂÂ &mdev_type_attr_name.attr,
> > +ÂÂÂ &mdev_type_attr_device_api.attr,
> > +ÂÂÂ &mdev_type_attr_available_instances.attr,
> > +ÂÂÂ &mdev_type_attr_type.attr,
> > +ÂÂÂ NULL,
> > +};
> > +
> > +static struct attribute_group mdev_type_group = {
> > + .name = "vdpa_virtio",
>
>
> To be consistent, it should be "vhost" or "virtio".
>
>
> > +ÂÂÂ .attrs = mdev_types_attrs,
> > +};
> > +
> > +static struct attribute_group *mdev_type_groups[] = {
> > +ÂÂÂ &mdev_type_group,
> > +ÂÂÂ NULL,
> > +};
> > +
> > +const struct attribute_group *mdev_dev_groups[] = {
> > +ÂÂÂ NULL,
> > +};
> > +
> > +static int ifcvf_mdev_create(struct kobject *kobj, struct 
> > mdev_device *mdev)
> > +{
> > +ÂÂÂ struct device *dev = mdev_parent_dev(mdev);
> > +ÂÂÂ struct pci_dev *pdev = to_pci_dev(dev);
> > +ÂÂÂ struct ifcvf_adapter *adapter = pci_get_drvdata(pdev);
> > +ÂÂÂ int ret = 0;
> > +
> > +ÂÂÂ mutex_lock(&adapter->mdev_lock);
> > +
> > +ÂÂÂ if (adapter->mdev_count < 1) {
> > +ÂÂÂÂÂÂÂ ret = -EINVAL;
> > +ÂÂÂÂÂÂÂ goto out;
> > +ÂÂÂ }
> > +
> > +ÂÂÂ mdev_set_class_id(mdev, MDEV_ID_VHOST);
> > +ÂÂÂ mdev_set_dev_ops(mdev, &ifc_mdev_ops);
> > +
> > +ÂÂÂ mdev_set_drvdata(mdev, adapter);
> > +ÂÂÂ mdev_set_iommu_device(mdev_dev(mdev), dev);
> > +
> > +ÂÂÂ INIT_LIST_HEAD(&adapter->dma_maps);
> > +ÂÂÂ adapter->mdev_count--;
> > +
> > +out:
> > +ÂÂÂ mutex_unlock(&adapter->mdev_lock);
> > +ÂÂÂ return ret;
> > +}
> > +
> > +static int ifcvf_mdev_remove(struct mdev_device *mdev)
> > +{
> > +ÂÂÂ struct device *dev = mdev_parent_dev(mdev);
> > +ÂÂÂ struct pci_dev *pdev = to_pci_dev(dev);
> > +ÂÂÂ struct ifcvf_adapter *adapter = pci_get_drvdata(pdev);
> > +
> > +ÂÂÂ mutex_lock(&adapter->mdev_lock);
> > +ÂÂÂ adapter->mdev_count++;
> > +ÂÂÂ mutex_unlock(&adapter->mdev_lock);
> > +
> > +ÂÂÂ return 0;
> > +}
> > +
> > +static struct mdev_parent_ops ifcvf_mdev_fops = {
> > +ÂÂÂ .ownerÂÂÂÂÂÂÂÂÂÂÂ = THIS_MODULE,
> > +ÂÂÂ .supported_type_groupsÂÂÂ = mdev_type_groups,
> > +ÂÂÂ .mdev_attr_groupsÂÂÂ = mdev_dev_groups,
> > +ÂÂÂ .createÂÂÂÂÂÂÂÂÂÂÂ = ifcvf_mdev_create,
> > +ÂÂÂ .removeÂÂÂÂÂÂÂÂÂÂÂ = ifcvf_mdev_remove,
> > +};
> > +
> > +static int ifcvf_probe(struct pci_dev *pdev, const struct 
> > pci_device_id *id)
> > +{
> > +ÂÂÂ struct device *dev = &pdev->dev;
> > +ÂÂÂ struct ifcvf_adapter *adapter;
> > +ÂÂÂ struct ifcvf_hw *vf;
> > +ÂÂÂ int ret, i;
> > +
> > +ÂÂÂ adapter = kzalloc(sizeof(struct ifcvf_adapter), GFP_KERNEL);
> > +ÂÂÂ if (adapter == NULL) {
> > +ÂÂÂÂÂÂÂ ret = -ENOMEM;
> > +ÂÂÂÂÂÂÂ goto fail;
> > +ÂÂÂ }
> > +
> > +ÂÂÂ mutex_init(&adapter->mdev_lock);
> > +ÂÂÂ adapter->mdev_count = 1;
>
>
> So this is per VF based vDPA implementation, which seems not 
> convenient for management. Anyhow we can control the creation in PF?
>
> Thanks
>
>
> > +ÂÂÂ adapter->dev = dev;
> > +
> > +ÂÂÂ pci_set_drvdata(pdev, adapter);
> > +
> > +ÂÂÂ ret = pci_enable_device(pdev);
> > +ÂÂÂ if (ret) {
> > +ÂÂÂÂÂÂÂ IFC_ERR(adapter->dev, "Failed to enable device.\n");
> > +ÂÂÂÂÂÂÂ goto free_adapter;
> > +ÂÂÂ }
> > +
> > +ÂÂÂ ret = pci_request_regions(pdev, IFCVF_DRIVER_NAME);
> > +ÂÂÂ if (ret) {
> > +ÂÂÂÂÂÂÂ IFC_ERR(adapter->dev, "Failed to request MMIO region.\n");
> > +ÂÂÂÂÂÂÂ goto disable_device;
> > +ÂÂÂ }
> > +
> > +ÂÂÂ pci_set_master(pdev);
> > +
> > +ÂÂÂ ret = ifcvf_init_msix(adapter);
> > +ÂÂÂ if (ret) {
> > +ÂÂÂÂÂÂÂ IFC_ERR(adapter->dev, "Failed to initialize MSIX.\n");
> > +ÂÂÂÂÂÂÂ goto free_msix;
> > +ÂÂÂ }
> > +
> > +ÂÂÂ vf = &adapter->vf;
> > +ÂÂÂ for (i = 0; i < IFCVF_PCI_MAX_RESOURCE; i++) {
> > +ÂÂÂÂÂÂÂ vf->mem_resource[i].phys_addr = pci_resource_start(pdev, i);
> > +ÂÂÂÂÂÂÂ vf->mem_resource[i].len = pci_resource_len(pdev, i);
> > +ÂÂÂÂÂÂÂ if (!vf->mem_resource[i].len) {
> > +ÂÂÂÂÂÂÂÂÂÂÂ vf->mem_resource[i].addr = NULL;
> > +ÂÂÂÂÂÂÂÂÂÂÂ continue;
> > +ÂÂÂÂÂÂÂ }
> > +
> > +ÂÂÂÂÂÂÂ vf->mem_resource[i].addr = pci_iomap_range(pdev, i, 0,
> > +ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ vf->mem_resource[i].len);
> > +ÂÂÂÂÂÂÂ if (!vf->mem_resource[i].addr) {
> > +ÂÂÂÂÂÂÂÂÂÂÂ IFC_ERR(adapter->dev, "Failed to map IO resource %d\n",
> > +ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ i);
> > +ÂÂÂÂÂÂÂÂÂÂÂ return -1;
> > +ÂÂÂÂÂÂÂ }
> > +ÂÂÂ }
> > +
> > +ÂÂÂ if (ifcvf_init_hw(vf, pdev) < 0)
> > +ÂÂÂÂÂÂÂ return -1;
> > +
> > +ÂÂÂ ret = mdev_register_device(dev, &ifcvf_mdev_fops);
> > +ÂÂÂ if (ret) {
> > + IFC_ERR(adapter->dev, "Failed to register mdev device\n");
> > +ÂÂÂÂÂÂÂ goto destroy_adapter;
> > +ÂÂÂ }
> > +
> > +ÂÂÂ return 0;
> > +
> > +destroy_adapter:
> > +ÂÂÂ ifcvf_destroy_adapter(adapter);
> > +free_msix:
> > +ÂÂÂ pci_free_irq_vectors(pdev);
> > +ÂÂÂ pci_release_regions(pdev);
> > +disable_device:
> > +ÂÂÂ pci_disable_device(pdev);
> > +free_adapter:
> > +ÂÂÂ kfree(adapter);
> > +fail:
> > +ÂÂÂ return ret;
> > +}
> > +
> > +static void ifcvf_remove(struct pci_dev *pdev)
> > +{
> > +ÂÂÂ struct device *dev = &pdev->dev;
> > +ÂÂÂ struct ifcvf_adapter *adapter = pci_get_drvdata(pdev);
> > +ÂÂÂ struct ifcvf_hw *vf;
> > +ÂÂÂ int i;
> > +
> > +ÂÂÂ mdev_unregister_device(dev);
> > +
> > +ÂÂÂ vf = &adapter->vf;
> > +ÂÂÂ for (i = 0; i < IFCVF_PCI_MAX_RESOURCE; i++) {
> > +ÂÂÂÂÂÂÂ if (vf->mem_resource[i].addr) {
> > +ÂÂÂÂÂÂÂÂÂÂÂ pci_iounmap(pdev, vf->mem_resource[i].addr);
> > +ÂÂÂÂÂÂÂÂÂÂÂ vf->mem_resource[i].addr = NULL;
> > +ÂÂÂÂÂÂÂ }
> > +ÂÂÂ }
> > +
> > +ÂÂÂ ifcvf_destroy_adapter(adapter);
> > +ÂÂÂ pci_free_irq_vectors(pdev);
> > +
> > +ÂÂÂ pci_release_regions(pdev);
> > +ÂÂÂ pci_disable_device(pdev);
> > +
> > +ÂÂÂ kfree(adapter);
> > +}
> > +
> > +static struct pci_device_id ifcvf_pci_ids[] = {
> > +ÂÂÂ { PCI_DEVICE_SUB(IFCVF_VENDOR_ID,
> > +ÂÂÂÂÂÂÂÂÂÂÂ IFCVF_DEVICE_ID,
> > +ÂÂÂÂÂÂÂÂÂÂÂ IFCVF_SUBSYS_VENDOR_ID,
> > +ÂÂÂÂÂÂÂÂÂÂÂ IFCVF_SUBSYS_DEVICE_ID) },
> > +ÂÂÂ { 0 },
> > +};
> > +MODULE_DEVICE_TABLE(pci, ifcvf_pci_ids);
> > +
> > +static struct pci_driver ifcvf_driver = {
> > +ÂÂÂ .nameÂÂÂÂ = IFCVF_DRIVER_NAME,
> > +ÂÂÂ .id_table = ifcvf_pci_ids,
> > +ÂÂÂ .probeÂÂÂ = ifcvf_probe,
> > +ÂÂÂ .removeÂÂ = ifcvf_remove,
> > +};
> > +
> > +static int __init ifcvf_init_module(void)
> > +{
> > +ÂÂÂ int ret;
> > +
> > +ÂÂÂ ret = pci_register_driver(&ifcvf_driver);
> > +ÂÂÂ return ret;
> > +}
> > +
> > +static void __exit ifcvf_exit_module(void)
> > +{
> > +ÂÂÂ pci_unregister_driver(&ifcvf_driver);
> > +}
> > +
> > +module_init(ifcvf_init_module);
> > +module_exit(ifcvf_exit_module);
> > +
> > +MODULE_LICENSE("GPL v2");
> > +MODULE_VERSION(VERSION_STRING);
> > +MODULE_AUTHOR(DRIVER_AUTHOR);