// SPDX-License-Identifier: GPL-2.0-only
/*
* vDPA bridge driver for Alibaba ENI(Elastic Network Interface)
*
* Copyright (c) 2021, Alibaba Inc. All rights reserved.
* Author: Wu Zongyong <[email protected]>
*
*/
#include "linux/bits.h"
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/vdpa.h>
#include <linux/virtio.h>
#include <linux/virtio_config.h>
#include <linux/virtio_ring.h>
#include <linux/virtio_pci.h>
#include <linux/virtio_pci_legacy.h>
#include <uapi/linux/virtio_net.h>
#define ENI_MSIX_NAME_SIZE 256
#define ENI_ERR(pdev, fmt, ...) \
dev_err(&pdev->dev, "%s"fmt, "eni_vdpa: ", ##__VA_ARGS__)
#define ENI_DBG(pdev, fmt, ...) \
dev_dbg(&pdev->dev, "%s"fmt, "eni_vdpa: ", ##__VA_ARGS__)
#define ENI_INFO(pdev, fmt, ...) \
dev_info(&pdev->dev, "%s"fmt, "eni_vdpa: ", ##__VA_ARGS__)
struct eni_vring {
void __iomem *notify;
char msix_name[ENI_MSIX_NAME_SIZE];
struct vdpa_callback cb;
int irq;
};
struct eni_vdpa {
struct vdpa_device vdpa;
struct virtio_pci_legacy_device ldev;
struct eni_vring *vring;
struct vdpa_callback config_cb;
char msix_name[ENI_MSIX_NAME_SIZE];
int config_irq;
int queues;
int vectors;
};
static struct eni_vdpa *vdpa_to_eni(struct vdpa_device *vdpa)
{
return container_of(vdpa, struct eni_vdpa, vdpa);
}
static struct virtio_pci_legacy_device *vdpa_to_ldev(struct vdpa_device *vdpa)
{
struct eni_vdpa *eni_vdpa = vdpa_to_eni(vdpa);
return &eni_vdpa->ldev;
}
static u64 eni_vdpa_get_device_features(struct vdpa_device *vdpa)
{
struct virtio_pci_legacy_device *ldev = vdpa_to_ldev(vdpa);
u64 features = vp_legacy_get_features(ldev);
features |= BIT_ULL(VIRTIO_F_ACCESS_PLATFORM);
features |= BIT_ULL(VIRTIO_F_ORDER_PLATFORM);
return features;
}
static int eni_vdpa_set_driver_features(struct vdpa_device *vdpa, u64 features)
{
struct virtio_pci_legacy_device *ldev = vdpa_to_ldev(vdpa);
if (!(features & BIT_ULL(VIRTIO_NET_F_MRG_RXBUF)) && features) {
ENI_ERR(ldev->pci_dev,
"VIRTIO_NET_F_MRG_RXBUF is not negotiated\n");
return -EINVAL;
}
vp_legacy_set_features(ldev, (u32)features);
return 0;
}
static u64 eni_vdpa_get_driver_features(struct vdpa_device *vdpa)
{
struct virtio_pci_legacy_device *ldev = vdpa_to_ldev(vdpa);
return vp_legacy_get_driver_features(ldev);
}
static u8 eni_vdpa_get_status(struct vdpa_device *vdpa)
{
struct virtio_pci_legacy_device *ldev = vdpa_to_ldev(vdpa);
return vp_legacy_get_status(ldev);
}
static int eni_vdpa_get_vq_irq(struct vdpa_device *vdpa, u16 idx)
{
struct eni_vdpa *eni_vdpa = vdpa_to_eni(vdpa);
int irq = eni_vdpa->vring[idx].irq;
if (irq == VIRTIO_MSI_NO_VECTOR)
return -EINVAL;
return irq;
}
static void eni_vdpa_free_irq(struct eni_vdpa *eni_vdpa)
{
struct virtio_pci_legacy_device *ldev = &eni_vdpa->ldev;
struct pci_dev *pdev = ldev->pci_dev;
int i;
for (i = 0; i < eni_vdpa->queues; i++) {
if (eni_vdpa->vring[i].irq != VIRTIO_MSI_NO_VECTOR) {
vp_legacy_queue_vector(ldev, i, VIRTIO_MSI_NO_VECTOR);
devm_free_irq(&pdev->dev, eni_vdpa->vring[i].irq,
&eni_vdpa->vring[i]);
eni_vdpa->vring[i].irq = VIRTIO_MSI_NO_VECTOR;
}
}
if (eni_vdpa->config_irq != VIRTIO_MSI_NO_VECTOR) {
vp_legacy_config_vector(ldev, VIRTIO_MSI_NO_VECTOR);
devm_free_irq(&pdev->dev, eni_vdpa->config_irq, eni_vdpa);
eni_vdpa->config_irq = VIRTIO_MSI_NO_VECTOR;
}
if (eni_vdpa->vectors) {
pci_free_irq_vectors(pdev);
eni_vdpa->vectors = 0;
}
}
static irqreturn_t eni_vdpa_vq_handler(int irq, void *arg)
{
struct eni_vring *vring = arg;
if (vring->cb.callback)
return vring->cb.callback(vring->cb.private);
return IRQ_HANDLED;
}
static irqreturn_t eni_vdpa_config_handler(int irq, void *arg)
{
struct eni_vdpa *eni_vdpa = arg;
if (eni_vdpa->config_cb.callback)
return eni_vdpa->config_cb.callback(eni_vdpa->config_cb.private);
return IRQ_HANDLED;
}
static int eni_vdpa_request_irq(struct eni_vdpa *eni_vdpa)
{
struct virtio_pci_legacy_device *ldev = &eni_vdpa->ldev;
struct pci_dev *pdev = ldev->pci_dev;
int i, ret, irq;
int queues = eni_vdpa->queues;
int vectors = queues + 1;
ret = pci_alloc_irq_vectors(pdev, vectors, vectors, PCI_IRQ_MSIX);
if (ret != vectors) {
ENI_ERR(pdev,
"failed to allocate irq vectors want %d but %d\n",
vectors, ret);
return ret;
}
eni_vdpa->vectors = vectors;
for (i = 0; i < queues; i++) {
snprintf(eni_vdpa->vring[i].msix_name, ENI_MSIX_NAME_SIZE,
"eni-vdpa[%s]-%d\n", pci_name(pdev), i);
irq = pci_irq_vector(pdev, i);
ret = devm_request_irq(&pdev->dev, irq,
eni_vdpa_vq_handler,
0, eni_vdpa->vring[i].msix_name,
&eni_vdpa->vring[i]);
if (ret) {
ENI_ERR(pdev, "failed to request irq for vq %d\n", i);
goto err;
}
vp_legacy_queue_vector(ldev, i, i);
eni_vdpa->vring[i].irq = irq;
}
snprintf(eni_vdpa->msix_name, ENI_MSIX_NAME_SIZE, "eni-vdpa[%s]-config\n",
pci_name(pdev));
irq = pci_irq_vector(pdev, queues);
ret = devm_request_irq(&pdev->dev, irq, eni_vdpa_config_handler, 0,
eni_vdpa->msix_name, eni_vdpa);
if (ret) {
ENI_ERR(pdev, "failed to request irq for config vq %d\n", i);
goto err;
}
vp_legacy_config_vector(ldev, queues);
eni_vdpa->config_irq = irq;
return 0;
err:
eni_vdpa_free_irq(eni_vdpa);
return ret;
}
static void eni_vdpa_set_status(struct vdpa_device *vdpa, u8 status)
{
struct eni_vdpa *eni_vdpa = vdpa_to_eni(vdpa);
struct virtio_pci_legacy_device *ldev = &eni_vdpa->ldev;
u8 s = eni_vdpa_get_status(vdpa);
if (status & VIRTIO_CONFIG_S_DRIVER_OK &&
!(s & VIRTIO_CONFIG_S_DRIVER_OK)) {
eni_vdpa_request_irq(eni_vdpa);
}
vp_legacy_set_status(ldev, status);
if (!(status & VIRTIO_CONFIG_S_DRIVER_OK) &&
(s & VIRTIO_CONFIG_S_DRIVER_OK))
eni_vdpa_free_irq(eni_vdpa);
}
static int eni_vdpa_reset(struct vdpa_device *vdpa)
{
struct eni_vdpa *eni_vdpa = vdpa_to_eni(vdpa);
struct virtio_pci_legacy_device *ldev = &eni_vdpa->ldev;
u8 s = eni_vdpa_get_status(vdpa);
vp_legacy_set_status(ldev, 0);
if (s & VIRTIO_CONFIG_S_DRIVER_OK)
eni_vdpa_free_irq(eni_vdpa);
return 0;
}
static u16 eni_vdpa_get_vq_num_max(struct vdpa_device *vdpa)
{
struct virtio_pci_legacy_device *ldev = vdpa_to_ldev(vdpa);
return vp_legacy_get_queue_size(ldev, 0);
}
static u16 eni_vdpa_get_vq_num_min(struct vdpa_device *vdpa)
{
struct virtio_pci_legacy_device *ldev = vdpa_to_ldev(vdpa);
return vp_legacy_get_queue_size(ldev, 0);
}
static u16 eni_vdpa_get_vq_size(struct vdpa_device *vdpa, u16 qid)
{
struct virtio_pci_legacy_device *ldev = vdpa_to_ldev(vdpa);
return vp_legacy_get_queue_size(ldev, qid);
}
static int eni_vdpa_get_vq_state(struct vdpa_device *vdpa, u16 qid,
struct vdpa_vq_state *state)
{
return -EOPNOTSUPP;
}
static int eni_vdpa_set_vq_state(struct vdpa_device *vdpa, u16 qid,
const struct vdpa_vq_state *state)
{
struct virtio_pci_legacy_device *ldev = vdpa_to_ldev(vdpa);
const struct vdpa_vq_state_split *split = &state->split;
/* ENI is build upon virtio-pci specfication which not support
* to set state of virtqueue. But if the state is equal to the
* device initial state by chance, we can let it go.
*/
if (!vp_legacy_get_queue_enable(ldev, qid)
&& split->avail_index == 0)
return 0;
return -EOPNOTSUPP;
}
static void eni_vdpa_set_vq_cb(struct vdpa_device *vdpa, u16 qid,
struct vdpa_callback *cb)
{
struct eni_vdpa *eni_vdpa = vdpa_to_eni(vdpa);
eni_vdpa->vring[qid].cb = *cb;
}
static void eni_vdpa_set_vq_ready(struct vdpa_device *vdpa, u16 qid,
bool ready)
{
struct virtio_pci_legacy_device *ldev = vdpa_to_ldev(vdpa);
/* ENI is a legacy virtio-pci device. This is not supported
* by specification. But we can disable virtqueue by setting
* address to 0.
*/
if (!ready)
vp_legacy_set_queue_address(ldev, qid, 0);
}
static bool eni_vdpa_get_vq_ready(struct vdpa_device *vdpa, u16 qid)
{
struct virtio_pci_legacy_device *ldev = vdpa_to_ldev(vdpa);
return vp_legacy_get_queue_enable(ldev, qid);
}
static void eni_vdpa_set_vq_num(struct vdpa_device *vdpa, u16 qid,
u32 num)
{
struct virtio_pci_legacy_device *ldev = vdpa_to_ldev(vdpa);
struct pci_dev *pdev = ldev->pci_dev;
u16 n = vp_legacy_get_queue_size(ldev, qid);
/* ENI is a legacy virtio-pci device which not allow to change
* virtqueue size. Just report a error if someone tries to
* change it.
*/
if (num != n)
ENI_ERR(pdev,
"not support to set vq %u fixed num %u to %u\n",
qid, n, num);
}
static int eni_vdpa_set_vq_address(struct vdpa_device *vdpa, u16 qid,
u64 desc_area, u64 driver_area,
u64 device_area)
{
struct virtio_pci_legacy_device *ldev = vdpa_to_ldev(vdpa);
u32 pfn = desc_area >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
vp_legacy_set_queue_address(ldev, qid, pfn);
return 0;
}
static void eni_vdpa_kick_vq(struct vdpa_device *vdpa, u16 qid)
{
struct eni_vdpa *eni_vdpa = vdpa_to_eni(vdpa);
iowrite16(qid, eni_vdpa->vring[qid].notify);
}
static u32 eni_vdpa_get_device_id(struct vdpa_device *vdpa)
{
struct virtio_pci_legacy_device *ldev = vdpa_to_ldev(vdpa);
return ldev->id.device;
}
static u32 eni_vdpa_get_vendor_id(struct vdpa_device *vdpa)
{
struct virtio_pci_legacy_device *ldev = vdpa_to_ldev(vdpa);
return ldev->id.vendor;
}
static u32 eni_vdpa_get_vq_align(struct vdpa_device *vdpa)
{
return VIRTIO_PCI_VRING_ALIGN;
}
static size_t eni_vdpa_get_config_size(struct vdpa_device *vdpa)
{
return sizeof(struct virtio_net_config);
}
static void eni_vdpa_get_config(struct vdpa_device *vdpa,
unsigned int offset,
void *buf, unsigned int len)
{
struct eni_vdpa *eni_vdpa = vdpa_to_eni(vdpa);
struct virtio_pci_legacy_device *ldev = &eni_vdpa->ldev;
void __iomem *ioaddr = ldev->ioaddr +
VIRTIO_PCI_CONFIG_OFF(eni_vdpa->vectors) +
offset;
u8 *p = buf;
int i;
for (i = 0; i < len; i++)
*p++ = ioread8(ioaddr + i);
}
static void eni_vdpa_set_config(struct vdpa_device *vdpa,
unsigned int offset, const void *buf,
unsigned int len)
{
struct eni_vdpa *eni_vdpa = vdpa_to_eni(vdpa);
struct virtio_pci_legacy_device *ldev = &eni_vdpa->ldev;
void __iomem *ioaddr = ldev->ioaddr +
VIRTIO_PCI_CONFIG_OFF(eni_vdpa->vectors) +
offset;
const u8 *p = buf;
int i;
for (i = 0; i < len; i++)
iowrite8(*p++, ioaddr + i);
}
static void eni_vdpa_set_config_cb(struct vdpa_device *vdpa,
struct vdpa_callback *cb)
{
struct eni_vdpa *eni_vdpa = vdpa_to_eni(vdpa);
eni_vdpa->config_cb = *cb;
}
static const struct vdpa_config_ops eni_vdpa_ops = {
.get_device_features = eni_vdpa_get_device_features,
.set_driver_features = eni_vdpa_set_driver_features,
.get_driver_features = eni_vdpa_get_driver_features,
.get_status = eni_vdpa_get_status,
.set_status = eni_vdpa_set_status,
.reset = eni_vdpa_reset,
.get_vq_num_max = eni_vdpa_get_vq_num_max,
.get_vq_num_min = eni_vdpa_get_vq_num_min,
.get_vq_size = eni_vdpa_get_vq_size,
.get_vq_state = eni_vdpa_get_vq_state,
.set_vq_state = eni_vdpa_set_vq_state,
.set_vq_cb = eni_vdpa_set_vq_cb,
.set_vq_ready = eni_vdpa_set_vq_ready,
.get_vq_ready = eni_vdpa_get_vq_ready,
.set_vq_num = eni_vdpa_set_vq_num,
.set_vq_address = eni_vdpa_set_vq_address,
.kick_vq = eni_vdpa_kick_vq,
.get_device_id = eni_vdpa_get_device_id,
.get_vendor_id = eni_vdpa_get_vendor_id,
.get_vq_align = eni_vdpa_get_vq_align,
.get_config_size = eni_vdpa_get_config_size,
.get_config = eni_vdpa_get_config,
.set_config = eni_vdpa_set_config,
.set_config_cb = eni_vdpa_set_config_cb,
.get_vq_irq = eni_vdpa_get_vq_irq,
};
static u16 eni_vdpa_get_num_queues(struct eni_vdpa *eni_vdpa)
{
struct virtio_pci_legacy_device *ldev = &eni_vdpa->ldev;
u32 features = vp_legacy_get_features(ldev);
u16 num = 2;
if (features & BIT_ULL(VIRTIO_NET_F_MQ)) {
__virtio16 max_virtqueue_pairs;
eni_vdpa_get_config(&eni_vdpa->vdpa,
offsetof(struct virtio_net_config, max_virtqueue_pairs),
&max_virtqueue_pairs,
sizeof(max_virtqueue_pairs));
num = 2 * __virtio16_to_cpu(virtio_legacy_is_little_endian(),
max_virtqueue_pairs);
}
if (features & BIT_ULL(VIRTIO_NET_F_CTRL_VQ))
num += 1;
return num;
}
static int eni_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct device *dev = &pdev->dev;
struct eni_vdpa *eni_vdpa;
struct virtio_pci_legacy_device *ldev;
int ret, i;
ret = pcim_enable_device(pdev);
if (ret)
return ret;
eni_vdpa = vdpa_alloc_device(struct eni_vdpa, vdpa,
dev, &eni_vdpa_ops, 1, 1, NULL, false);
if (IS_ERR(eni_vdpa)) {
ENI_ERR(pdev, "failed to allocate vDPA structure\n");
return PTR_ERR(eni_vdpa);
}
ldev = &eni_vdpa->ldev;
ldev->pci_dev = pdev;
ret = vp_legacy_probe(ldev);
if (ret) {
ENI_ERR(pdev, "failed to probe legacy PCI device\n");
goto err;
}
pci_set_master(pdev);
pci_set_drvdata(pdev, eni_vdpa);
eni_vdpa->vdpa.dma_dev = &pdev->dev;
eni_vdpa->queues = eni_vdpa_get_num_queues(eni_vdpa);
eni_vdpa->vring = devm_kcalloc(&pdev->dev, eni_vdpa->queues,
sizeof(*eni_vdpa->vring),
GFP_KERNEL);
if (!eni_vdpa->vring) {
ret = -ENOMEM;
ENI_ERR(pdev, "failed to allocate virtqueues\n");
goto err_remove_vp_legacy;
}
for (i = 0; i < eni_vdpa->queues; i++) {
eni_vdpa->vring[i].irq = VIRTIO_MSI_NO_VECTOR;
eni_vdpa->vring[i].notify = ldev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY;
}
eni_vdpa->config_irq = VIRTIO_MSI_NO_VECTOR;
ret = vdpa_register_device(&eni_vdpa->vdpa, eni_vdpa->queues);
if (ret) {
ENI_ERR(pdev, "failed to register to vdpa bus\n");
goto err_remove_vp_legacy;
}
return 0;
err_remove_vp_legacy:
vp_legacy_remove(&eni_vdpa->ldev);
err:
put_device(&eni_vdpa->vdpa.dev);
return ret;
}
static void eni_vdpa_remove(struct pci_dev *pdev)
{
struct eni_vdpa *eni_vdpa = pci_get_drvdata(pdev);
vdpa_unregister_device(&eni_vdpa->vdpa);
vp_legacy_remove(&eni_vdpa->ldev);
}
static struct pci_device_id eni_pci_ids[] = {
{ PCI_DEVICE_SUB(PCI_VENDOR_ID_REDHAT_QUMRANET,
VIRTIO_TRANS_ID_NET,
PCI_SUBVENDOR_ID_REDHAT_QUMRANET,
VIRTIO_ID_NET) },
{ 0 },
};
static struct pci_driver eni_vdpa_driver = {
.name = "alibaba-eni-vdpa",
.id_table = eni_pci_ids,
.probe = eni_vdpa_probe,
.remove = eni_vdpa_remove,
};
module_pci_driver(eni_vdpa_driver);
MODULE_AUTHOR("Wu Zongyong <[email protected]>");
MODULE_DESCRIPTION("Alibaba ENI vDPA driver");
MODULE_LICENSE("GPL v2");
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