| // 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; |
| } |
| |
| 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; |
| irq = pci_irq_vector(pdev, vector); |
| ret = devm_request_irq(&pdev->dev, irq, |
| ifcvf_config_changed, 0, |
| vf->config_msix_name, vf); |
| |
| 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); |