mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
549 lines
14 KiB
549 lines
14 KiB
// 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 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_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; |
|
} |
|
|
|
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; |
|
} |
|
|
|
return 0; |
|
|
|
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");
|
|
|