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|
// 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_config_changed(int irq, void *arg)
{
struct ifcvf_hw *vf = arg;
if (vf->config_cb.callback)
return vf->config_cb.callback(vf->config_cb.private);
return IRQ_HANDLED;
}
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 void ifcvf_free_irq_vectors(void *data)
{
pci_free_irq_vectors(data);
}
static void ifcvf_free_irq(struct ifcvf_adapter *adapter, int queues)
{
struct pci_dev *pdev = adapter->pdev;
struct ifcvf_hw *vf = &adapter->vf;
int i;
for (i = 0; i < queues; i++) {
devm_free_irq(&pdev->dev, vf->vring[i].irq, &vf->vring[i]);
vf->vring[i].irq = -EINVAL;
}
ifcvf_free_irq_vectors(pdev);
}
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;
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;
}
snprintf(vf->config_msix_name, 256, "ifcvf[%s]-config\n",
pci_name(pdev));
vector = 0;
irq = pci_irq_vector(pdev, vector);
ret = devm_request_irq(&pdev->dev, irq,
ifcvf_config_changed, 0,
vf->config_msix_name, vf);
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);
ifcvf_free_irq(adapter, i);
return ret;
}
vf->vring[i].irq = irq;
}
return 0;
}
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;
u8 status_old;
int ret;
vf = vdpa_to_vf(vdpa_dev);
adapter = dev_get_drvdata(vdpa_dev->dev.parent);
status_old = ifcvf_get_status(vf);
if (status_old == status)
return;
if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) &&
!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
ifcvf_stop_datapath(adapter);
ifcvf_free_irq(adapter, IFCVF_MAX_QUEUE_PAIRS * 2);
}
if (status == 0) {
ifcvf_reset_vring(adapter);
return;
}
if ((status & VIRTIO_CONFIG_S_DRIVER_OK) &&
!(status_old & VIRTIO_CONFIG_S_DRIVER_OK)) {
ret = ifcvf_request_irq(adapter);
if (ret) {
status = ifcvf_get_status(vf);
status |= VIRTIO_CONFIG_S_FAILED;
ifcvf_set_status(vf, status);
return;
}
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)
{
struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
vf->config_cb.callback = cb->callback;
vf->config_cb.private = cb->private;
}
static int ifcvf_vdpa_get_vq_irq(struct vdpa_device *vdpa_dev,
u16 qid)
{
struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
return vf->vring[qid].irq;
}
/*
* 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,
.get_vq_irq = ifcvf_vdpa_get_vq_irq,
.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_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, i;
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 = 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_init_hw(vf, pdev);
if (ret) {
IFCVF_ERR(pdev, "Failed to init IFCVF hw\n");
goto err;
}
for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++)
vf->vring[i].irq = -EINVAL;
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);
|