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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Intel IFC VF NIC driver for virtio dataplane offloading
- *
- * Copyright (C) 2020 Intel Corporation.
- *
- * Author: Zhu Lingshan <lingshan.zhu@intel.com>
- *
- */
- #include <linux/interrupt.h>
- #include <linux/module.h>
- #include <linux/pci.h>
- #include <linux/sysfs.h>
- #include "ifcvf_base.h"
- #define VERSION_STRING "0.1"
- #define DRIVER_AUTHOR "Intel Corporation"
- #define IFCVF_DRIVER_NAME "ifcvf"
- static irqreturn_t ifcvf_config_changed(int irq, void *arg)
- {
- struct ifcvf_hw *vf = arg;
- if (vf->config_cb.callback)
- return vf->config_cb.callback(vf->config_cb.private);
- return IRQ_HANDLED;
- }
- static irqreturn_t ifcvf_intr_handler(int irq, void *arg)
- {
- struct vring_info *vring = arg;
- if (vring->cb.callback)
- return vring->cb.callback(vring->cb.private);
- return IRQ_HANDLED;
- }
- static void ifcvf_free_irq_vectors(void *data)
- {
- pci_free_irq_vectors(data);
- }
- static void ifcvf_free_irq(struct ifcvf_adapter *adapter, int queues)
- {
- struct pci_dev *pdev = adapter->pdev;
- struct ifcvf_hw *vf = &adapter->vf;
- int i;
- for (i = 0; i < queues; i++) {
- devm_free_irq(&pdev->dev, vf->vring[i].irq, &vf->vring[i]);
- vf->vring[i].irq = -EINVAL;
- }
- devm_free_irq(&pdev->dev, vf->config_irq, vf);
- ifcvf_free_irq_vectors(pdev);
- }
- static int ifcvf_request_irq(struct ifcvf_adapter *adapter)
- {
- struct pci_dev *pdev = adapter->pdev;
- struct ifcvf_hw *vf = &adapter->vf;
- int vector, i, ret, irq;
- ret = pci_alloc_irq_vectors(pdev, IFCVF_MAX_INTR,
- IFCVF_MAX_INTR, PCI_IRQ_MSIX);
- if (ret < 0) {
- IFCVF_ERR(pdev, "Failed to alloc IRQ vectors\n");
- return ret;
- }
- snprintf(vf->config_msix_name, 256, "ifcvf[%s]-config\n",
- pci_name(pdev));
- vector = 0;
- vf->config_irq = pci_irq_vector(pdev, vector);
- ret = devm_request_irq(&pdev->dev, vf->config_irq,
- ifcvf_config_changed, 0,
- vf->config_msix_name, vf);
- if (ret) {
- IFCVF_ERR(pdev, "Failed to request config irq\n");
- return ret;
- }
- for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
- snprintf(vf->vring[i].msix_name, 256, "ifcvf[%s]-%d\n",
- pci_name(pdev), i);
- vector = i + IFCVF_MSI_QUEUE_OFF;
- irq = pci_irq_vector(pdev, vector);
- ret = devm_request_irq(&pdev->dev, irq,
- ifcvf_intr_handler, 0,
- vf->vring[i].msix_name,
- &vf->vring[i]);
- if (ret) {
- IFCVF_ERR(pdev,
- "Failed to request irq for vq %d\n", i);
- ifcvf_free_irq(adapter, i);
- return ret;
- }
- vf->vring[i].irq = irq;
- }
- return 0;
- }
- static int ifcvf_start_datapath(void *private)
- {
- struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
- u8 status;
- int ret;
- vf->nr_vring = IFCVF_MAX_QUEUE_PAIRS * 2;
- ret = ifcvf_start_hw(vf);
- if (ret < 0) {
- status = ifcvf_get_status(vf);
- status |= VIRTIO_CONFIG_S_FAILED;
- ifcvf_set_status(vf, status);
- }
- return ret;
- }
- static int ifcvf_stop_datapath(void *private)
- {
- struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
- int i;
- for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++)
- vf->vring[i].cb.callback = NULL;
- ifcvf_stop_hw(vf);
- return 0;
- }
- static void ifcvf_reset_vring(struct ifcvf_adapter *adapter)
- {
- struct ifcvf_hw *vf = ifcvf_private_to_vf(adapter);
- int i;
- for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
- vf->vring[i].last_avail_idx = 0;
- vf->vring[i].desc = 0;
- vf->vring[i].avail = 0;
- vf->vring[i].used = 0;
- vf->vring[i].ready = 0;
- vf->vring[i].cb.callback = NULL;
- vf->vring[i].cb.private = NULL;
- }
- ifcvf_reset(vf);
- }
- static struct ifcvf_adapter *vdpa_to_adapter(struct vdpa_device *vdpa_dev)
- {
- return container_of(vdpa_dev, struct ifcvf_adapter, vdpa);
- }
- static struct ifcvf_hw *vdpa_to_vf(struct vdpa_device *vdpa_dev)
- {
- struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
- return &adapter->vf;
- }
- static u64 ifcvf_vdpa_get_features(struct vdpa_device *vdpa_dev)
- {
- struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
- u64 features;
- features = ifcvf_get_features(vf) & IFCVF_SUPPORTED_FEATURES;
- return features;
- }
- static int ifcvf_vdpa_set_features(struct vdpa_device *vdpa_dev, u64 features)
- {
- struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
- vf->req_features = features;
- return 0;
- }
- static u8 ifcvf_vdpa_get_status(struct vdpa_device *vdpa_dev)
- {
- struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
- return ifcvf_get_status(vf);
- }
- static void ifcvf_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
- {
- struct ifcvf_adapter *adapter;
- struct ifcvf_hw *vf;
- u8 status_old;
- int ret;
- vf = vdpa_to_vf(vdpa_dev);
- adapter = dev_get_drvdata(vdpa_dev->dev.parent);
- status_old = ifcvf_get_status(vf);
- if (status_old == status)
- return;
- if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) &&
- !(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
- ifcvf_stop_datapath(adapter);
- ifcvf_free_irq(adapter, IFCVF_MAX_QUEUE_PAIRS * 2);
- }
- if (status == 0) {
- ifcvf_reset_vring(adapter);
- return;
- }
- if ((status & VIRTIO_CONFIG_S_DRIVER_OK) &&
- !(status_old & VIRTIO_CONFIG_S_DRIVER_OK)) {
- ret = ifcvf_request_irq(adapter);
- if (ret) {
- status = ifcvf_get_status(vf);
- status |= VIRTIO_CONFIG_S_FAILED;
- ifcvf_set_status(vf, status);
- return;
- }
- if (ifcvf_start_datapath(adapter) < 0)
- IFCVF_ERR(adapter->pdev,
- "Failed to set ifcvf vdpa status %u\n",
- status);
- }
- ifcvf_set_status(vf, status);
- }
- static u16 ifcvf_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev)
- {
- return IFCVF_QUEUE_MAX;
- }
- static int ifcvf_vdpa_get_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
- struct vdpa_vq_state *state)
- {
- struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
- state->avail_index = ifcvf_get_vq_state(vf, qid);
- return 0;
- }
- static int ifcvf_vdpa_set_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
- const struct vdpa_vq_state *state)
- {
- struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
- return ifcvf_set_vq_state(vf, qid, state->avail_index);
- }
- static void ifcvf_vdpa_set_vq_cb(struct vdpa_device *vdpa_dev, u16 qid,
- struct vdpa_callback *cb)
- {
- struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
- vf->vring[qid].cb = *cb;
- }
- static void ifcvf_vdpa_set_vq_ready(struct vdpa_device *vdpa_dev,
- u16 qid, bool ready)
- {
- struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
- vf->vring[qid].ready = ready;
- }
- static bool ifcvf_vdpa_get_vq_ready(struct vdpa_device *vdpa_dev, u16 qid)
- {
- struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
- return vf->vring[qid].ready;
- }
- static void ifcvf_vdpa_set_vq_num(struct vdpa_device *vdpa_dev, u16 qid,
- u32 num)
- {
- struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
- vf->vring[qid].size = num;
- }
- static int ifcvf_vdpa_set_vq_address(struct vdpa_device *vdpa_dev, u16 qid,
- u64 desc_area, u64 driver_area,
- u64 device_area)
- {
- struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
- vf->vring[qid].desc = desc_area;
- vf->vring[qid].avail = driver_area;
- vf->vring[qid].used = device_area;
- return 0;
- }
- static void ifcvf_vdpa_kick_vq(struct vdpa_device *vdpa_dev, u16 qid)
- {
- struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
- ifcvf_notify_queue(vf, qid);
- }
- static u32 ifcvf_vdpa_get_generation(struct vdpa_device *vdpa_dev)
- {
- struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
- return ioread8(&vf->common_cfg->config_generation);
- }
- static u32 ifcvf_vdpa_get_device_id(struct vdpa_device *vdpa_dev)
- {
- return VIRTIO_ID_NET;
- }
- static u32 ifcvf_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)
- {
- return IFCVF_SUBSYS_VENDOR_ID;
- }
- static u32 ifcvf_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
- {
- return IFCVF_QUEUE_ALIGNMENT;
- }
- static void ifcvf_vdpa_get_config(struct vdpa_device *vdpa_dev,
- unsigned int offset,
- void *buf, unsigned int len)
- {
- struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
- WARN_ON(offset + len > sizeof(struct virtio_net_config));
- ifcvf_read_net_config(vf, offset, buf, len);
- }
- static void ifcvf_vdpa_set_config(struct vdpa_device *vdpa_dev,
- unsigned int offset, const void *buf,
- unsigned int len)
- {
- struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
- WARN_ON(offset + len > sizeof(struct virtio_net_config));
- ifcvf_write_net_config(vf, offset, buf, len);
- }
- static void ifcvf_vdpa_set_config_cb(struct vdpa_device *vdpa_dev,
- struct vdpa_callback *cb)
- {
- struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
- vf->config_cb.callback = cb->callback;
- vf->config_cb.private = cb->private;
- }
- static int ifcvf_vdpa_get_vq_irq(struct vdpa_device *vdpa_dev,
- u16 qid)
- {
- struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
- return vf->vring[qid].irq;
- }
- /*
- * IFCVF currently does't have on-chip IOMMU, so not
- * implemented set_map()/dma_map()/dma_unmap()
- */
- static const struct vdpa_config_ops ifc_vdpa_ops = {
- .get_features = ifcvf_vdpa_get_features,
- .set_features = ifcvf_vdpa_set_features,
- .get_status = ifcvf_vdpa_get_status,
- .set_status = ifcvf_vdpa_set_status,
- .get_vq_num_max = ifcvf_vdpa_get_vq_num_max,
- .get_vq_state = ifcvf_vdpa_get_vq_state,
- .set_vq_state = ifcvf_vdpa_set_vq_state,
- .set_vq_cb = ifcvf_vdpa_set_vq_cb,
- .set_vq_ready = ifcvf_vdpa_set_vq_ready,
- .get_vq_ready = ifcvf_vdpa_get_vq_ready,
- .set_vq_num = ifcvf_vdpa_set_vq_num,
- .set_vq_address = ifcvf_vdpa_set_vq_address,
- .get_vq_irq = ifcvf_vdpa_get_vq_irq,
- .kick_vq = ifcvf_vdpa_kick_vq,
- .get_generation = ifcvf_vdpa_get_generation,
- .get_device_id = ifcvf_vdpa_get_device_id,
- .get_vendor_id = ifcvf_vdpa_get_vendor_id,
- .get_vq_align = ifcvf_vdpa_get_vq_align,
- .get_config = ifcvf_vdpa_get_config,
- .set_config = ifcvf_vdpa_set_config,
- .set_config_cb = ifcvf_vdpa_set_config_cb,
- };
- static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
- {
- struct device *dev = &pdev->dev;
- struct ifcvf_adapter *adapter;
- struct ifcvf_hw *vf;
- int ret, i;
- ret = pcim_enable_device(pdev);
- if (ret) {
- IFCVF_ERR(pdev, "Failed to enable device\n");
- return ret;
- }
- 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 = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
- if (ret) {
- IFCVF_ERR(pdev, "No usable DMA confiugration\n");
- return ret;
- }
- ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
- if (ret) {
- IFCVF_ERR(pdev,
- "No usable coherent DMA confiugration\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,
- IFCVF_MAX_QUEUE_PAIRS * 2);
- 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;
- 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;
- ret = vdpa_register_device(&adapter->vdpa);
- 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[] = {
- { PCI_DEVICE_SUB(IFCVF_VENDOR_ID,
- IFCVF_DEVICE_ID,
- IFCVF_SUBSYS_VENDOR_ID,
- IFCVF_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");
- MODULE_VERSION(VERSION_STRING);
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