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![Jason Wang](/assets/img/avatar_default.png)
This patch extends the vdpa_vq_state to support packed virtqueue state which is basically the device/driver ring wrap counters and the avail and used index. This will be used for the virito-vdpa support for the packed virtqueue and the future vhost/vhost-vdpa support for the packed virtqueue. Signed-off-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20210602021536.39525-2-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Eli Cohen <elic@nvidia.com>
584 lines
14 KiB
C
584 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Intel IFC VF NIC driver for virtio dataplane offloading
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*
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* Copyright (C) 2020 Intel Corporation.
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*
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* Author: Zhu Lingshan <lingshan.zhu@intel.com>
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*
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*/
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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/sysfs.h>
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#include "ifcvf_base.h"
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#define DRIVER_AUTHOR "Intel Corporation"
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#define IFCVF_DRIVER_NAME "ifcvf"
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static irqreturn_t ifcvf_config_changed(int irq, void *arg)
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{
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struct ifcvf_hw *vf = arg;
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if (vf->config_cb.callback)
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return vf->config_cb.callback(vf->config_cb.private);
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return IRQ_HANDLED;
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}
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static irqreturn_t ifcvf_intr_handler(int irq, void *arg)
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{
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struct vring_info *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 void ifcvf_free_irq_vectors(void *data)
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{
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pci_free_irq_vectors(data);
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}
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static void ifcvf_free_irq(struct ifcvf_adapter *adapter, int queues)
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{
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struct pci_dev *pdev = adapter->pdev;
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struct ifcvf_hw *vf = &adapter->vf;
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int i;
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for (i = 0; i < queues; i++) {
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devm_free_irq(&pdev->dev, vf->vring[i].irq, &vf->vring[i]);
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vf->vring[i].irq = -EINVAL;
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}
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devm_free_irq(&pdev->dev, vf->config_irq, vf);
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ifcvf_free_irq_vectors(pdev);
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}
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static int ifcvf_request_irq(struct ifcvf_adapter *adapter)
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{
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struct pci_dev *pdev = adapter->pdev;
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struct ifcvf_hw *vf = &adapter->vf;
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int vector, i, ret, irq;
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ret = pci_alloc_irq_vectors(pdev, IFCVF_MAX_INTR,
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IFCVF_MAX_INTR, PCI_IRQ_MSIX);
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if (ret < 0) {
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IFCVF_ERR(pdev, "Failed to alloc IRQ vectors\n");
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return ret;
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}
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snprintf(vf->config_msix_name, 256, "ifcvf[%s]-config\n",
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pci_name(pdev));
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vector = 0;
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vf->config_irq = pci_irq_vector(pdev, vector);
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ret = devm_request_irq(&pdev->dev, vf->config_irq,
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ifcvf_config_changed, 0,
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vf->config_msix_name, vf);
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if (ret) {
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IFCVF_ERR(pdev, "Failed to request config irq\n");
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return ret;
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}
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for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
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snprintf(vf->vring[i].msix_name, 256, "ifcvf[%s]-%d\n",
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pci_name(pdev), i);
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vector = i + IFCVF_MSI_QUEUE_OFF;
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irq = pci_irq_vector(pdev, vector);
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ret = devm_request_irq(&pdev->dev, irq,
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ifcvf_intr_handler, 0,
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vf->vring[i].msix_name,
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&vf->vring[i]);
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if (ret) {
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IFCVF_ERR(pdev,
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"Failed to request irq for vq %d\n", i);
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ifcvf_free_irq(adapter, i);
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return ret;
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}
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vf->vring[i].irq = irq;
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}
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return 0;
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}
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static int ifcvf_start_datapath(void *private)
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{
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struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
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u8 status;
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int ret;
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vf->nr_vring = IFCVF_MAX_QUEUE_PAIRS * 2;
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ret = ifcvf_start_hw(vf);
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if (ret < 0) {
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status = ifcvf_get_status(vf);
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status |= VIRTIO_CONFIG_S_FAILED;
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ifcvf_set_status(vf, status);
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}
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return ret;
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}
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static int ifcvf_stop_datapath(void *private)
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{
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struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
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int i;
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for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++)
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vf->vring[i].cb.callback = NULL;
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ifcvf_stop_hw(vf);
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return 0;
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}
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static void ifcvf_reset_vring(struct ifcvf_adapter *adapter)
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{
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struct ifcvf_hw *vf = ifcvf_private_to_vf(adapter);
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int i;
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for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
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vf->vring[i].last_avail_idx = 0;
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vf->vring[i].desc = 0;
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vf->vring[i].avail = 0;
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vf->vring[i].used = 0;
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vf->vring[i].ready = 0;
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vf->vring[i].cb.callback = NULL;
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vf->vring[i].cb.private = NULL;
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}
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ifcvf_reset(vf);
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}
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static struct ifcvf_adapter *vdpa_to_adapter(struct vdpa_device *vdpa_dev)
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{
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return container_of(vdpa_dev, struct ifcvf_adapter, vdpa);
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}
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static struct ifcvf_hw *vdpa_to_vf(struct vdpa_device *vdpa_dev)
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{
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struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
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return &adapter->vf;
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}
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static u64 ifcvf_vdpa_get_features(struct vdpa_device *vdpa_dev)
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{
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struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
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struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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struct pci_dev *pdev = adapter->pdev;
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u64 features;
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switch (vf->dev_type) {
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case VIRTIO_ID_NET:
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features = ifcvf_get_features(vf) & IFCVF_NET_SUPPORTED_FEATURES;
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break;
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case VIRTIO_ID_BLOCK:
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features = ifcvf_get_features(vf);
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break;
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default:
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features = 0;
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IFCVF_ERR(pdev, "VIRTIO ID %u not supported\n", vf->dev_type);
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}
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return features;
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}
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static int ifcvf_vdpa_set_features(struct vdpa_device *vdpa_dev, u64 features)
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{
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struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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int ret;
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ret = ifcvf_verify_min_features(vf, features);
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if (ret)
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return ret;
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vf->req_features = features;
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return 0;
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}
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static u8 ifcvf_vdpa_get_status(struct vdpa_device *vdpa_dev)
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{
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struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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return ifcvf_get_status(vf);
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}
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static void ifcvf_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
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{
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struct ifcvf_adapter *adapter;
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struct ifcvf_hw *vf;
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u8 status_old;
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int ret;
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vf = vdpa_to_vf(vdpa_dev);
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adapter = dev_get_drvdata(vdpa_dev->dev.parent);
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status_old = ifcvf_get_status(vf);
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if (status_old == status)
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return;
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if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) &&
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!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
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ifcvf_stop_datapath(adapter);
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ifcvf_free_irq(adapter, IFCVF_MAX_QUEUE_PAIRS * 2);
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}
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if (status == 0) {
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ifcvf_reset_vring(adapter);
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return;
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}
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if ((status & VIRTIO_CONFIG_S_DRIVER_OK) &&
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!(status_old & VIRTIO_CONFIG_S_DRIVER_OK)) {
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ret = ifcvf_request_irq(adapter);
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if (ret) {
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status = ifcvf_get_status(vf);
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status |= VIRTIO_CONFIG_S_FAILED;
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ifcvf_set_status(vf, status);
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return;
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}
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if (ifcvf_start_datapath(adapter) < 0)
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IFCVF_ERR(adapter->pdev,
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"Failed to set ifcvf vdpa status %u\n",
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status);
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}
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ifcvf_set_status(vf, status);
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}
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static u16 ifcvf_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev)
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{
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return IFCVF_QUEUE_MAX;
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}
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static int ifcvf_vdpa_get_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
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struct vdpa_vq_state *state)
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{
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struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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state->split.avail_index = ifcvf_get_vq_state(vf, qid);
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return 0;
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}
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static int ifcvf_vdpa_set_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
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const struct vdpa_vq_state *state)
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{
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struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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return ifcvf_set_vq_state(vf, qid, state->split.avail_index);
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}
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static void ifcvf_vdpa_set_vq_cb(struct vdpa_device *vdpa_dev, u16 qid,
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struct vdpa_callback *cb)
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{
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struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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vf->vring[qid].cb = *cb;
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}
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static void ifcvf_vdpa_set_vq_ready(struct vdpa_device *vdpa_dev,
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u16 qid, bool ready)
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{
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struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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vf->vring[qid].ready = ready;
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}
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static bool ifcvf_vdpa_get_vq_ready(struct vdpa_device *vdpa_dev, u16 qid)
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{
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struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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return vf->vring[qid].ready;
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}
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static void ifcvf_vdpa_set_vq_num(struct vdpa_device *vdpa_dev, u16 qid,
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u32 num)
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{
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struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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vf->vring[qid].size = num;
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}
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static int ifcvf_vdpa_set_vq_address(struct vdpa_device *vdpa_dev, 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 ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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vf->vring[qid].desc = desc_area;
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vf->vring[qid].avail = driver_area;
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vf->vring[qid].used = device_area;
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return 0;
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}
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static void ifcvf_vdpa_kick_vq(struct vdpa_device *vdpa_dev, u16 qid)
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{
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struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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ifcvf_notify_queue(vf, qid);
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}
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static u32 ifcvf_vdpa_get_generation(struct vdpa_device *vdpa_dev)
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{
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struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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return ioread8(&vf->common_cfg->config_generation);
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}
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static u32 ifcvf_vdpa_get_device_id(struct vdpa_device *vdpa_dev)
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{
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struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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return vf->dev_type;
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}
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static u32 ifcvf_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)
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{
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struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
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struct pci_dev *pdev = adapter->pdev;
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return pdev->subsystem_vendor;
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}
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static u32 ifcvf_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
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{
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return IFCVF_QUEUE_ALIGNMENT;
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}
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static size_t ifcvf_vdpa_get_config_size(struct vdpa_device *vdpa_dev)
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{
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struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
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struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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struct pci_dev *pdev = adapter->pdev;
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size_t size;
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switch (vf->dev_type) {
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case VIRTIO_ID_NET:
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size = sizeof(struct virtio_net_config);
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break;
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case VIRTIO_ID_BLOCK:
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size = sizeof(struct virtio_blk_config);
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break;
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default:
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size = 0;
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IFCVF_ERR(pdev, "VIRTIO ID %u not supported\n", vf->dev_type);
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}
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return size;
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}
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static void ifcvf_vdpa_get_config(struct vdpa_device *vdpa_dev,
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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 ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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WARN_ON(offset + len > sizeof(struct virtio_net_config));
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ifcvf_read_net_config(vf, offset, buf, len);
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}
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static void ifcvf_vdpa_set_config(struct vdpa_device *vdpa_dev,
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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 ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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WARN_ON(offset + len > sizeof(struct virtio_net_config));
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ifcvf_write_net_config(vf, offset, buf, len);
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}
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static void ifcvf_vdpa_set_config_cb(struct vdpa_device *vdpa_dev,
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struct vdpa_callback *cb)
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{
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struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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vf->config_cb.callback = cb->callback;
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vf->config_cb.private = cb->private;
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}
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static int ifcvf_vdpa_get_vq_irq(struct vdpa_device *vdpa_dev,
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u16 qid)
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{
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struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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return vf->vring[qid].irq;
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}
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static struct vdpa_notification_area ifcvf_get_vq_notification(struct vdpa_device *vdpa_dev,
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u16 idx)
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{
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struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
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struct vdpa_notification_area area;
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area.addr = vf->vring[idx].notify_pa;
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if (!vf->notify_off_multiplier)
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area.size = PAGE_SIZE;
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else
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area.size = vf->notify_off_multiplier;
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return area;
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}
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/*
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* IFCVF currently does't have on-chip IOMMU, so not
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* implemented set_map()/dma_map()/dma_unmap()
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*/
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static const struct vdpa_config_ops ifc_vdpa_ops = {
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.get_features = ifcvf_vdpa_get_features,
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.set_features = ifcvf_vdpa_set_features,
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.get_status = ifcvf_vdpa_get_status,
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.set_status = ifcvf_vdpa_set_status,
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.get_vq_num_max = ifcvf_vdpa_get_vq_num_max,
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.get_vq_state = ifcvf_vdpa_get_vq_state,
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.set_vq_state = ifcvf_vdpa_set_vq_state,
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.set_vq_cb = ifcvf_vdpa_set_vq_cb,
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.set_vq_ready = ifcvf_vdpa_set_vq_ready,
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.get_vq_ready = ifcvf_vdpa_get_vq_ready,
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.set_vq_num = ifcvf_vdpa_set_vq_num,
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.set_vq_address = ifcvf_vdpa_set_vq_address,
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.get_vq_irq = ifcvf_vdpa_get_vq_irq,
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.kick_vq = ifcvf_vdpa_kick_vq,
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.get_generation = ifcvf_vdpa_get_generation,
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.get_device_id = ifcvf_vdpa_get_device_id,
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.get_vendor_id = ifcvf_vdpa_get_vendor_id,
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.get_vq_align = ifcvf_vdpa_get_vq_align,
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.get_config_size = ifcvf_vdpa_get_config_size,
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.get_config = ifcvf_vdpa_get_config,
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.set_config = ifcvf_vdpa_set_config,
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.set_config_cb = ifcvf_vdpa_set_config_cb,
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.get_vq_notification = ifcvf_get_vq_notification,
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};
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static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
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{
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struct device *dev = &pdev->dev;
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struct ifcvf_adapter *adapter;
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struct ifcvf_hw *vf;
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int ret, i;
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ret = pcim_enable_device(pdev);
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if (ret) {
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IFCVF_ERR(pdev, "Failed to enable device\n");
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return ret;
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}
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|
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 = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
|
|
if (ret) {
|
|
IFCVF_ERR(pdev, "No usable DMA configuration\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, NULL);
|
|
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;
|
|
|
|
/* This drirver drives both modern virtio devices and transitional
|
|
* devices in modern mode.
|
|
* vDPA requires feature bit VIRTIO_F_ACCESS_PLATFORM,
|
|
* so legacy devices and transitional devices in legacy
|
|
* mode will not work for vDPA, this driver will not
|
|
* drive devices with legacy interface.
|
|
*/
|
|
if (pdev->device < 0x1040)
|
|
vf->dev_type = pdev->subsystem_device;
|
|
else
|
|
vf->dev_type = pdev->device - 0x1040;
|
|
|
|
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;
|
|
|
|
vf->hw_features = ifcvf_get_hw_features(vf);
|
|
|
|
ret = vdpa_register_device(&adapter->vdpa, IFCVF_MAX_QUEUE_PAIRS * 2);
|
|
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[] = {
|
|
/* N3000 network device */
|
|
{ PCI_DEVICE_SUB(PCI_VENDOR_ID_REDHAT_QUMRANET,
|
|
N3000_DEVICE_ID,
|
|
PCI_VENDOR_ID_INTEL,
|
|
N3000_SUBSYS_DEVICE_ID) },
|
|
/* C5000X-PL network device */
|
|
{ PCI_DEVICE_SUB(PCI_VENDOR_ID_REDHAT_QUMRANET,
|
|
VIRTIO_TRANS_ID_NET,
|
|
PCI_VENDOR_ID_INTEL,
|
|
VIRTIO_ID_NET) },
|
|
/* C5000X-PL block device */
|
|
{ PCI_DEVICE_SUB(PCI_VENDOR_ID_REDHAT_QUMRANET,
|
|
VIRTIO_TRANS_ID_BLOCK,
|
|
PCI_VENDOR_ID_INTEL,
|
|
VIRTIO_ID_BLOCK) },
|
|
|
|
{ 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");
|