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