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565 lines
13 KiB
565 lines
13 KiB
// 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 <[email protected]> |
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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->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->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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/* |
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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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}; |
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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), |
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IFCVF_DRIVER_NAME); |
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if (ret) { |
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IFCVF_ERR(pdev, "Failed to request MMIO region\n"); |
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return ret; |
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} |
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ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64)); |
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if (ret) { |
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IFCVF_ERR(pdev, "No usable DMA configuration\n"); |
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return ret; |
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} |
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ret = devm_add_action_or_reset(dev, ifcvf_free_irq_vectors, pdev); |
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if (ret) { |
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IFCVF_ERR(pdev, |
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"Failed for adding devres for freeing irq vectors\n"); |
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return ret; |
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} |
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adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa, |
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dev, &ifc_vdpa_ops, NULL); |
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if (adapter == NULL) { |
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IFCVF_ERR(pdev, "Failed to allocate vDPA structure"); |
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return -ENOMEM; |
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} |
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pci_set_master(pdev); |
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pci_set_drvdata(pdev, adapter); |
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vf = &adapter->vf; |
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|
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/* This drirver drives both modern virtio devices and transitional |
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* devices in modern mode. |
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* vDPA requires feature bit VIRTIO_F_ACCESS_PLATFORM, |
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* so legacy devices and transitional devices in legacy |
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* mode will not work for vDPA, this driver will not |
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* drive devices with legacy interface. |
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*/ |
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if (pdev->device < 0x1040) |
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vf->dev_type = pdev->subsystem_device; |
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else |
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vf->dev_type = pdev->device - 0x1040; |
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vf->base = pcim_iomap_table(pdev); |
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adapter->pdev = pdev; |
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adapter->vdpa.dma_dev = &pdev->dev; |
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ret = ifcvf_init_hw(vf, pdev); |
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if (ret) { |
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IFCVF_ERR(pdev, "Failed to init IFCVF hw\n"); |
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goto err; |
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} |
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for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) |
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vf->vring[i].irq = -EINVAL; |
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vf->hw_features = ifcvf_get_hw_features(vf); |
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ret = vdpa_register_device(&adapter->vdpa, IFCVF_MAX_QUEUE_PAIRS * 2); |
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if (ret) { |
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IFCVF_ERR(pdev, "Failed to register ifcvf to vdpa bus"); |
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goto err; |
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} |
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return 0; |
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err: |
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put_device(&adapter->vdpa.dev); |
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return ret; |
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} |
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static void ifcvf_remove(struct pci_dev *pdev) |
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{ |
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struct ifcvf_adapter *adapter = pci_get_drvdata(pdev); |
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vdpa_unregister_device(&adapter->vdpa); |
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} |
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|
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static struct pci_device_id ifcvf_pci_ids[] = { |
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{ PCI_DEVICE_SUB(N3000_VENDOR_ID, |
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N3000_DEVICE_ID, |
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N3000_SUBSYS_VENDOR_ID, |
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N3000_SUBSYS_DEVICE_ID) }, |
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{ PCI_DEVICE_SUB(C5000X_PL_VENDOR_ID, |
|
C5000X_PL_DEVICE_ID, |
|
C5000X_PL_SUBSYS_VENDOR_ID, |
|
C5000X_PL_SUBSYS_DEVICE_ID) }, |
|
{ PCI_DEVICE_SUB(C5000X_PL_BLK_VENDOR_ID, |
|
C5000X_PL_BLK_DEVICE_ID, |
|
C5000X_PL_BLK_SUBSYS_VENDOR_ID, |
|
C5000X_PL_BLK_SUBSYS_DEVICE_ID) }, |
|
|
|
{ 0 }, |
|
}; |
|
MODULE_DEVICE_TABLE(pci, ifcvf_pci_ids); |
|
|
|
static struct pci_driver ifcvf_driver = { |
|
.name = IFCVF_DRIVER_NAME, |
|
.id_table = ifcvf_pci_ids, |
|
.probe = ifcvf_probe, |
|
.remove = ifcvf_remove, |
|
}; |
|
|
|
module_pci_driver(ifcvf_driver); |
|
|
|
MODULE_LICENSE("GPL v2");
|
|
|