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f6d955d808
Avoid the wrapper holding cf_mutex since it is not protecting anything. To avoid confusion and unnecessary overhead incurred by it, remove. Fixes: f489f27bc0ab ("vdpa: Sync calls set/get config/status with cf_mutex") Signed-off-by: Eli Cohen <elic@nvidia.com> Link: https://lore.kernel.org/r/20220111183400.38418-2-elic@nvidia.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Si-Wei Liu<si-wei.liu@oracle.com> Acked-by: Jason Wang <jasowang@redhat.com>
1074 lines
27 KiB
C
1074 lines
27 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* vDPA bus.
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*
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* Copyright (c) 2020, Red Hat. All rights reserved.
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* Author: Jason Wang <jasowang@redhat.com>
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*
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*/
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#include <linux/module.h>
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#include <linux/idr.h>
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#include <linux/slab.h>
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#include <linux/vdpa.h>
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#include <uapi/linux/vdpa.h>
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#include <net/genetlink.h>
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#include <linux/mod_devicetable.h>
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#include <linux/virtio_ids.h>
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static LIST_HEAD(mdev_head);
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/* A global mutex that protects vdpa management device and device level operations. */
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static DEFINE_MUTEX(vdpa_dev_mutex);
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static DEFINE_IDA(vdpa_index_ida);
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void vdpa_set_status(struct vdpa_device *vdev, u8 status)
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{
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mutex_lock(&vdev->cf_mutex);
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vdev->config->set_status(vdev, status);
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mutex_unlock(&vdev->cf_mutex);
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}
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EXPORT_SYMBOL(vdpa_set_status);
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static struct genl_family vdpa_nl_family;
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static int vdpa_dev_probe(struct device *d)
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{
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struct vdpa_device *vdev = dev_to_vdpa(d);
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struct vdpa_driver *drv = drv_to_vdpa(vdev->dev.driver);
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const struct vdpa_config_ops *ops = vdev->config;
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u32 max_num, min_num = 1;
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int ret = 0;
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max_num = ops->get_vq_num_max(vdev);
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if (ops->get_vq_num_min)
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min_num = ops->get_vq_num_min(vdev);
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if (max_num < min_num)
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return -EINVAL;
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if (drv && drv->probe)
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ret = drv->probe(vdev);
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return ret;
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}
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static void vdpa_dev_remove(struct device *d)
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{
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struct vdpa_device *vdev = dev_to_vdpa(d);
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struct vdpa_driver *drv = drv_to_vdpa(vdev->dev.driver);
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if (drv && drv->remove)
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drv->remove(vdev);
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}
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static int vdpa_dev_match(struct device *dev, struct device_driver *drv)
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{
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struct vdpa_device *vdev = dev_to_vdpa(dev);
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/* Check override first, and if set, only use the named driver */
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if (vdev->driver_override)
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return strcmp(vdev->driver_override, drv->name) == 0;
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/* Currently devices must be supported by all vDPA bus drivers */
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return 1;
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}
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static ssize_t driver_override_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct vdpa_device *vdev = dev_to_vdpa(dev);
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const char *driver_override, *old;
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char *cp;
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/* We need to keep extra room for a newline */
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if (count >= (PAGE_SIZE - 1))
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return -EINVAL;
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driver_override = kstrndup(buf, count, GFP_KERNEL);
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if (!driver_override)
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return -ENOMEM;
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cp = strchr(driver_override, '\n');
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if (cp)
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*cp = '\0';
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device_lock(dev);
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old = vdev->driver_override;
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if (strlen(driver_override)) {
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vdev->driver_override = driver_override;
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} else {
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kfree(driver_override);
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vdev->driver_override = NULL;
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}
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device_unlock(dev);
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kfree(old);
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return count;
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}
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static ssize_t driver_override_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct vdpa_device *vdev = dev_to_vdpa(dev);
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ssize_t len;
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device_lock(dev);
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len = snprintf(buf, PAGE_SIZE, "%s\n", vdev->driver_override);
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device_unlock(dev);
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return len;
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}
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static DEVICE_ATTR_RW(driver_override);
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static struct attribute *vdpa_dev_attrs[] = {
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&dev_attr_driver_override.attr,
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NULL,
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};
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static const struct attribute_group vdpa_dev_group = {
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.attrs = vdpa_dev_attrs,
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};
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__ATTRIBUTE_GROUPS(vdpa_dev);
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static struct bus_type vdpa_bus = {
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.name = "vdpa",
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.dev_groups = vdpa_dev_groups,
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.match = vdpa_dev_match,
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.probe = vdpa_dev_probe,
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.remove = vdpa_dev_remove,
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};
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static void vdpa_release_dev(struct device *d)
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{
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struct vdpa_device *vdev = dev_to_vdpa(d);
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const struct vdpa_config_ops *ops = vdev->config;
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if (ops->free)
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ops->free(vdev);
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ida_simple_remove(&vdpa_index_ida, vdev->index);
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mutex_destroy(&vdev->cf_mutex);
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kfree(vdev->driver_override);
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kfree(vdev);
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}
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/**
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* __vdpa_alloc_device - allocate and initilaize a vDPA device
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* This allows driver to some prepartion after device is
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* initialized but before registered.
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* @parent: the parent device
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* @config: the bus operations that is supported by this device
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* @size: size of the parent structure that contains private data
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* @name: name of the vdpa device; optional.
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* @use_va: indicate whether virtual address must be used by this device
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*
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* Driver should use vdpa_alloc_device() wrapper macro instead of
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* using this directly.
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*
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* Return: Returns an error when parent/config/dma_dev is not set or fail to get
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* ida.
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*/
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struct vdpa_device *__vdpa_alloc_device(struct device *parent,
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const struct vdpa_config_ops *config,
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size_t size, const char *name,
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bool use_va)
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{
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struct vdpa_device *vdev;
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int err = -EINVAL;
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if (!config)
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goto err;
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if (!!config->dma_map != !!config->dma_unmap)
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goto err;
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/* It should only work for the device that use on-chip IOMMU */
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if (use_va && !(config->dma_map || config->set_map))
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goto err;
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err = -ENOMEM;
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vdev = kzalloc(size, GFP_KERNEL);
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if (!vdev)
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goto err;
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err = ida_alloc(&vdpa_index_ida, GFP_KERNEL);
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if (err < 0)
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goto err_ida;
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vdev->dev.bus = &vdpa_bus;
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vdev->dev.parent = parent;
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vdev->dev.release = vdpa_release_dev;
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vdev->index = err;
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vdev->config = config;
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vdev->features_valid = false;
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vdev->use_va = use_va;
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if (name)
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err = dev_set_name(&vdev->dev, "%s", name);
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else
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err = dev_set_name(&vdev->dev, "vdpa%u", vdev->index);
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if (err)
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goto err_name;
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mutex_init(&vdev->cf_mutex);
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device_initialize(&vdev->dev);
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return vdev;
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err_name:
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ida_simple_remove(&vdpa_index_ida, vdev->index);
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err_ida:
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kfree(vdev);
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err:
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return ERR_PTR(err);
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}
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EXPORT_SYMBOL_GPL(__vdpa_alloc_device);
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static int vdpa_name_match(struct device *dev, const void *data)
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{
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struct vdpa_device *vdev = container_of(dev, struct vdpa_device, dev);
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return (strcmp(dev_name(&vdev->dev), data) == 0);
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}
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static int __vdpa_register_device(struct vdpa_device *vdev, int nvqs)
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{
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struct device *dev;
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vdev->nvqs = nvqs;
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lockdep_assert_held(&vdpa_dev_mutex);
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dev = bus_find_device(&vdpa_bus, NULL, dev_name(&vdev->dev), vdpa_name_match);
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if (dev) {
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put_device(dev);
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return -EEXIST;
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}
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return device_add(&vdev->dev);
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}
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/**
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* _vdpa_register_device - register a vDPA device with vdpa lock held
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* Caller must have a succeed call of vdpa_alloc_device() before.
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* Caller must invoke this routine in the management device dev_add()
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* callback after setting up valid mgmtdev for this vdpa device.
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* @vdev: the vdpa device to be registered to vDPA bus
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* @nvqs: number of virtqueues supported by this device
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*
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* Return: Returns an error when fail to add device to vDPA bus
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*/
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int _vdpa_register_device(struct vdpa_device *vdev, int nvqs)
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{
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if (!vdev->mdev)
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return -EINVAL;
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return __vdpa_register_device(vdev, nvqs);
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}
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EXPORT_SYMBOL_GPL(_vdpa_register_device);
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/**
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* vdpa_register_device - register a vDPA device
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* Callers must have a succeed call of vdpa_alloc_device() before.
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* @vdev: the vdpa device to be registered to vDPA bus
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* @nvqs: number of virtqueues supported by this device
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*
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* Return: Returns an error when fail to add to vDPA bus
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*/
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int vdpa_register_device(struct vdpa_device *vdev, int nvqs)
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{
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int err;
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mutex_lock(&vdpa_dev_mutex);
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err = __vdpa_register_device(vdev, nvqs);
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mutex_unlock(&vdpa_dev_mutex);
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return err;
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}
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EXPORT_SYMBOL_GPL(vdpa_register_device);
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/**
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* _vdpa_unregister_device - unregister a vDPA device
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* Caller must invoke this routine as part of management device dev_del()
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* callback.
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* @vdev: the vdpa device to be unregisted from vDPA bus
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*/
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void _vdpa_unregister_device(struct vdpa_device *vdev)
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{
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lockdep_assert_held(&vdpa_dev_mutex);
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WARN_ON(!vdev->mdev);
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device_unregister(&vdev->dev);
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}
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EXPORT_SYMBOL_GPL(_vdpa_unregister_device);
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/**
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* vdpa_unregister_device - unregister a vDPA device
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* @vdev: the vdpa device to be unregisted from vDPA bus
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*/
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void vdpa_unregister_device(struct vdpa_device *vdev)
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{
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mutex_lock(&vdpa_dev_mutex);
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device_unregister(&vdev->dev);
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mutex_unlock(&vdpa_dev_mutex);
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}
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EXPORT_SYMBOL_GPL(vdpa_unregister_device);
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/**
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* __vdpa_register_driver - register a vDPA device driver
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* @drv: the vdpa device driver to be registered
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* @owner: module owner of the driver
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*
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* Return: Returns an err when fail to do the registration
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*/
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int __vdpa_register_driver(struct vdpa_driver *drv, struct module *owner)
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{
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drv->driver.bus = &vdpa_bus;
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drv->driver.owner = owner;
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return driver_register(&drv->driver);
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}
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EXPORT_SYMBOL_GPL(__vdpa_register_driver);
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/**
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* vdpa_unregister_driver - unregister a vDPA device driver
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* @drv: the vdpa device driver to be unregistered
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*/
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void vdpa_unregister_driver(struct vdpa_driver *drv)
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{
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driver_unregister(&drv->driver);
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}
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EXPORT_SYMBOL_GPL(vdpa_unregister_driver);
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/**
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* vdpa_mgmtdev_register - register a vdpa management device
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*
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* @mdev: Pointer to vdpa management device
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* vdpa_mgmtdev_register() register a vdpa management device which supports
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* vdpa device management.
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* Return: Returns 0 on success or failure when required callback ops are not
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* initialized.
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*/
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int vdpa_mgmtdev_register(struct vdpa_mgmt_dev *mdev)
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{
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if (!mdev->device || !mdev->ops || !mdev->ops->dev_add || !mdev->ops->dev_del)
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return -EINVAL;
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INIT_LIST_HEAD(&mdev->list);
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mutex_lock(&vdpa_dev_mutex);
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list_add_tail(&mdev->list, &mdev_head);
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mutex_unlock(&vdpa_dev_mutex);
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return 0;
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}
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EXPORT_SYMBOL_GPL(vdpa_mgmtdev_register);
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static int vdpa_match_remove(struct device *dev, void *data)
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{
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struct vdpa_device *vdev = container_of(dev, struct vdpa_device, dev);
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struct vdpa_mgmt_dev *mdev = vdev->mdev;
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if (mdev == data)
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mdev->ops->dev_del(mdev, vdev);
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return 0;
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}
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void vdpa_mgmtdev_unregister(struct vdpa_mgmt_dev *mdev)
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{
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mutex_lock(&vdpa_dev_mutex);
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list_del(&mdev->list);
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/* Filter out all the entries belong to this management device and delete it. */
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bus_for_each_dev(&vdpa_bus, NULL, mdev, vdpa_match_remove);
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mutex_unlock(&vdpa_dev_mutex);
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}
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EXPORT_SYMBOL_GPL(vdpa_mgmtdev_unregister);
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static void vdpa_get_config_unlocked(struct vdpa_device *vdev,
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unsigned int offset,
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void *buf, unsigned int len)
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{
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const struct vdpa_config_ops *ops = vdev->config;
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/*
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* Config accesses aren't supposed to trigger before features are set.
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* If it does happen we assume a legacy guest.
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*/
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if (!vdev->features_valid)
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vdpa_set_features(vdev, 0, true);
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ops->get_config(vdev, offset, buf, len);
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}
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/**
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* vdpa_get_config - Get one or more device configuration fields.
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* @vdev: vdpa device to operate on
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* @offset: starting byte offset of the field
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* @buf: buffer pointer to read to
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* @len: length of the configuration fields in bytes
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*/
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void vdpa_get_config(struct vdpa_device *vdev, unsigned int offset,
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void *buf, unsigned int len)
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{
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mutex_lock(&vdev->cf_mutex);
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vdpa_get_config_unlocked(vdev, offset, buf, len);
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mutex_unlock(&vdev->cf_mutex);
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}
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EXPORT_SYMBOL_GPL(vdpa_get_config);
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/**
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* vdpa_set_config - Set one or more device configuration fields.
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* @vdev: vdpa device to operate on
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* @offset: starting byte offset of the field
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* @buf: buffer pointer to read from
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* @length: length of the configuration fields in bytes
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*/
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void vdpa_set_config(struct vdpa_device *vdev, unsigned int offset,
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const void *buf, unsigned int length)
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{
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mutex_lock(&vdev->cf_mutex);
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vdev->config->set_config(vdev, offset, buf, length);
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mutex_unlock(&vdev->cf_mutex);
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}
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EXPORT_SYMBOL_GPL(vdpa_set_config);
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static bool mgmtdev_handle_match(const struct vdpa_mgmt_dev *mdev,
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const char *busname, const char *devname)
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{
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/* Bus name is optional for simulated management device, so ignore the
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* device with bus if bus attribute is provided.
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*/
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if ((busname && !mdev->device->bus) || (!busname && mdev->device->bus))
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return false;
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if (!busname && strcmp(dev_name(mdev->device), devname) == 0)
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return true;
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if (busname && (strcmp(mdev->device->bus->name, busname) == 0) &&
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(strcmp(dev_name(mdev->device), devname) == 0))
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return true;
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return false;
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}
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static struct vdpa_mgmt_dev *vdpa_mgmtdev_get_from_attr(struct nlattr **attrs)
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{
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struct vdpa_mgmt_dev *mdev;
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const char *busname = NULL;
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const char *devname;
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if (!attrs[VDPA_ATTR_MGMTDEV_DEV_NAME])
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return ERR_PTR(-EINVAL);
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devname = nla_data(attrs[VDPA_ATTR_MGMTDEV_DEV_NAME]);
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if (attrs[VDPA_ATTR_MGMTDEV_BUS_NAME])
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busname = nla_data(attrs[VDPA_ATTR_MGMTDEV_BUS_NAME]);
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list_for_each_entry(mdev, &mdev_head, list) {
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if (mgmtdev_handle_match(mdev, busname, devname))
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return mdev;
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}
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return ERR_PTR(-ENODEV);
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}
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static int vdpa_nl_mgmtdev_handle_fill(struct sk_buff *msg, const struct vdpa_mgmt_dev *mdev)
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{
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if (mdev->device->bus &&
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nla_put_string(msg, VDPA_ATTR_MGMTDEV_BUS_NAME, mdev->device->bus->name))
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return -EMSGSIZE;
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if (nla_put_string(msg, VDPA_ATTR_MGMTDEV_DEV_NAME, dev_name(mdev->device)))
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return -EMSGSIZE;
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return 0;
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}
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static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *msg,
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u32 portid, u32 seq, int flags)
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{
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u64 supported_classes = 0;
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void *hdr;
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int i = 0;
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int err;
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hdr = genlmsg_put(msg, portid, seq, &vdpa_nl_family, flags, VDPA_CMD_MGMTDEV_NEW);
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if (!hdr)
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return -EMSGSIZE;
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err = vdpa_nl_mgmtdev_handle_fill(msg, mdev);
|
|
if (err)
|
|
goto msg_err;
|
|
|
|
while (mdev->id_table[i].device) {
|
|
if (mdev->id_table[i].device <= 63)
|
|
supported_classes |= BIT_ULL(mdev->id_table[i].device);
|
|
i++;
|
|
}
|
|
|
|
if (nla_put_u64_64bit(msg, VDPA_ATTR_MGMTDEV_SUPPORTED_CLASSES,
|
|
supported_classes, VDPA_ATTR_UNSPEC)) {
|
|
err = -EMSGSIZE;
|
|
goto msg_err;
|
|
}
|
|
if (nla_put_u32(msg, VDPA_ATTR_DEV_MGMTDEV_MAX_VQS,
|
|
mdev->max_supported_vqs)) {
|
|
err = -EMSGSIZE;
|
|
goto msg_err;
|
|
}
|
|
if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_SUPPORTED_FEATURES,
|
|
mdev->supported_features, VDPA_ATTR_PAD)) {
|
|
err = -EMSGSIZE;
|
|
goto msg_err;
|
|
}
|
|
|
|
genlmsg_end(msg, hdr);
|
|
return 0;
|
|
|
|
msg_err:
|
|
genlmsg_cancel(msg, hdr);
|
|
return err;
|
|
}
|
|
|
|
static int vdpa_nl_cmd_mgmtdev_get_doit(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct vdpa_mgmt_dev *mdev;
|
|
struct sk_buff *msg;
|
|
int err;
|
|
|
|
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
mutex_lock(&vdpa_dev_mutex);
|
|
mdev = vdpa_mgmtdev_get_from_attr(info->attrs);
|
|
if (IS_ERR(mdev)) {
|
|
mutex_unlock(&vdpa_dev_mutex);
|
|
NL_SET_ERR_MSG_MOD(info->extack, "Fail to find the specified mgmt device");
|
|
err = PTR_ERR(mdev);
|
|
goto out;
|
|
}
|
|
|
|
err = vdpa_mgmtdev_fill(mdev, msg, info->snd_portid, info->snd_seq, 0);
|
|
mutex_unlock(&vdpa_dev_mutex);
|
|
if (err)
|
|
goto out;
|
|
err = genlmsg_reply(msg, info);
|
|
return err;
|
|
|
|
out:
|
|
nlmsg_free(msg);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
vdpa_nl_cmd_mgmtdev_get_dumpit(struct sk_buff *msg, struct netlink_callback *cb)
|
|
{
|
|
struct vdpa_mgmt_dev *mdev;
|
|
int start = cb->args[0];
|
|
int idx = 0;
|
|
int err;
|
|
|
|
mutex_lock(&vdpa_dev_mutex);
|
|
list_for_each_entry(mdev, &mdev_head, list) {
|
|
if (idx < start) {
|
|
idx++;
|
|
continue;
|
|
}
|
|
err = vdpa_mgmtdev_fill(mdev, msg, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, NLM_F_MULTI);
|
|
if (err)
|
|
goto out;
|
|
idx++;
|
|
}
|
|
out:
|
|
mutex_unlock(&vdpa_dev_mutex);
|
|
cb->args[0] = idx;
|
|
return msg->len;
|
|
}
|
|
|
|
#define VDPA_DEV_NET_ATTRS_MASK (BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR) | \
|
|
BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MTU) | \
|
|
BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP))
|
|
|
|
static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct vdpa_dev_set_config config = {};
|
|
struct nlattr **nl_attrs = info->attrs;
|
|
struct vdpa_mgmt_dev *mdev;
|
|
const u8 *macaddr;
|
|
const char *name;
|
|
int err = 0;
|
|
|
|
if (!info->attrs[VDPA_ATTR_DEV_NAME])
|
|
return -EINVAL;
|
|
|
|
name = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]);
|
|
|
|
if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MACADDR]) {
|
|
macaddr = nla_data(nl_attrs[VDPA_ATTR_DEV_NET_CFG_MACADDR]);
|
|
memcpy(config.net.mac, macaddr, sizeof(config.net.mac));
|
|
config.mask |= BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR);
|
|
}
|
|
if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MTU]) {
|
|
config.net.mtu =
|
|
nla_get_u16(nl_attrs[VDPA_ATTR_DEV_NET_CFG_MTU]);
|
|
config.mask |= BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MTU);
|
|
}
|
|
if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MAX_VQP]) {
|
|
config.net.max_vq_pairs =
|
|
nla_get_u16(nl_attrs[VDPA_ATTR_DEV_NET_CFG_MAX_VQP]);
|
|
if (!config.net.max_vq_pairs) {
|
|
NL_SET_ERR_MSG_MOD(info->extack,
|
|
"At least one pair of VQs is required");
|
|
return -EINVAL;
|
|
}
|
|
config.mask |= BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP);
|
|
}
|
|
|
|
/* Skip checking capability if user didn't prefer to configure any
|
|
* device networking attributes. It is likely that user might have used
|
|
* a device specific method to configure such attributes or using device
|
|
* default attributes.
|
|
*/
|
|
if ((config.mask & VDPA_DEV_NET_ATTRS_MASK) &&
|
|
!netlink_capable(skb, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
mutex_lock(&vdpa_dev_mutex);
|
|
mdev = vdpa_mgmtdev_get_from_attr(info->attrs);
|
|
if (IS_ERR(mdev)) {
|
|
NL_SET_ERR_MSG_MOD(info->extack, "Fail to find the specified management device");
|
|
err = PTR_ERR(mdev);
|
|
goto err;
|
|
}
|
|
if ((config.mask & mdev->config_attr_mask) != config.mask) {
|
|
NL_SET_ERR_MSG_MOD(info->extack,
|
|
"All provided attributes are not supported");
|
|
err = -EOPNOTSUPP;
|
|
goto err;
|
|
}
|
|
|
|
err = mdev->ops->dev_add(mdev, name, &config);
|
|
err:
|
|
mutex_unlock(&vdpa_dev_mutex);
|
|
return err;
|
|
}
|
|
|
|
static int vdpa_nl_cmd_dev_del_set_doit(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct vdpa_mgmt_dev *mdev;
|
|
struct vdpa_device *vdev;
|
|
struct device *dev;
|
|
const char *name;
|
|
int err = 0;
|
|
|
|
if (!info->attrs[VDPA_ATTR_DEV_NAME])
|
|
return -EINVAL;
|
|
name = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]);
|
|
|
|
mutex_lock(&vdpa_dev_mutex);
|
|
dev = bus_find_device(&vdpa_bus, NULL, name, vdpa_name_match);
|
|
if (!dev) {
|
|
NL_SET_ERR_MSG_MOD(info->extack, "device not found");
|
|
err = -ENODEV;
|
|
goto dev_err;
|
|
}
|
|
vdev = container_of(dev, struct vdpa_device, dev);
|
|
if (!vdev->mdev) {
|
|
NL_SET_ERR_MSG_MOD(info->extack, "Only user created device can be deleted by user");
|
|
err = -EINVAL;
|
|
goto mdev_err;
|
|
}
|
|
mdev = vdev->mdev;
|
|
mdev->ops->dev_del(mdev, vdev);
|
|
mdev_err:
|
|
put_device(dev);
|
|
dev_err:
|
|
mutex_unlock(&vdpa_dev_mutex);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
vdpa_dev_fill(struct vdpa_device *vdev, struct sk_buff *msg, u32 portid, u32 seq,
|
|
int flags, struct netlink_ext_ack *extack)
|
|
{
|
|
u16 max_vq_size;
|
|
u16 min_vq_size = 1;
|
|
u32 device_id;
|
|
u32 vendor_id;
|
|
void *hdr;
|
|
int err;
|
|
|
|
hdr = genlmsg_put(msg, portid, seq, &vdpa_nl_family, flags, VDPA_CMD_DEV_NEW);
|
|
if (!hdr)
|
|
return -EMSGSIZE;
|
|
|
|
err = vdpa_nl_mgmtdev_handle_fill(msg, vdev->mdev);
|
|
if (err)
|
|
goto msg_err;
|
|
|
|
device_id = vdev->config->get_device_id(vdev);
|
|
vendor_id = vdev->config->get_vendor_id(vdev);
|
|
max_vq_size = vdev->config->get_vq_num_max(vdev);
|
|
if (vdev->config->get_vq_num_min)
|
|
min_vq_size = vdev->config->get_vq_num_min(vdev);
|
|
|
|
err = -EMSGSIZE;
|
|
if (nla_put_string(msg, VDPA_ATTR_DEV_NAME, dev_name(&vdev->dev)))
|
|
goto msg_err;
|
|
if (nla_put_u32(msg, VDPA_ATTR_DEV_ID, device_id))
|
|
goto msg_err;
|
|
if (nla_put_u32(msg, VDPA_ATTR_DEV_VENDOR_ID, vendor_id))
|
|
goto msg_err;
|
|
if (nla_put_u32(msg, VDPA_ATTR_DEV_MAX_VQS, vdev->nvqs))
|
|
goto msg_err;
|
|
if (nla_put_u16(msg, VDPA_ATTR_DEV_MAX_VQ_SIZE, max_vq_size))
|
|
goto msg_err;
|
|
if (nla_put_u16(msg, VDPA_ATTR_DEV_MIN_VQ_SIZE, min_vq_size))
|
|
goto msg_err;
|
|
|
|
genlmsg_end(msg, hdr);
|
|
return 0;
|
|
|
|
msg_err:
|
|
genlmsg_cancel(msg, hdr);
|
|
return err;
|
|
}
|
|
|
|
static int vdpa_nl_cmd_dev_get_doit(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct vdpa_device *vdev;
|
|
struct sk_buff *msg;
|
|
const char *devname;
|
|
struct device *dev;
|
|
int err;
|
|
|
|
if (!info->attrs[VDPA_ATTR_DEV_NAME])
|
|
return -EINVAL;
|
|
devname = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]);
|
|
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
mutex_lock(&vdpa_dev_mutex);
|
|
dev = bus_find_device(&vdpa_bus, NULL, devname, vdpa_name_match);
|
|
if (!dev) {
|
|
NL_SET_ERR_MSG_MOD(info->extack, "device not found");
|
|
err = -ENODEV;
|
|
goto err;
|
|
}
|
|
vdev = container_of(dev, struct vdpa_device, dev);
|
|
if (!vdev->mdev) {
|
|
err = -EINVAL;
|
|
goto mdev_err;
|
|
}
|
|
err = vdpa_dev_fill(vdev, msg, info->snd_portid, info->snd_seq, 0, info->extack);
|
|
if (!err)
|
|
err = genlmsg_reply(msg, info);
|
|
mdev_err:
|
|
put_device(dev);
|
|
err:
|
|
mutex_unlock(&vdpa_dev_mutex);
|
|
if (err)
|
|
nlmsg_free(msg);
|
|
return err;
|
|
}
|
|
|
|
struct vdpa_dev_dump_info {
|
|
struct sk_buff *msg;
|
|
struct netlink_callback *cb;
|
|
int start_idx;
|
|
int idx;
|
|
};
|
|
|
|
static int vdpa_dev_dump(struct device *dev, void *data)
|
|
{
|
|
struct vdpa_device *vdev = container_of(dev, struct vdpa_device, dev);
|
|
struct vdpa_dev_dump_info *info = data;
|
|
int err;
|
|
|
|
if (!vdev->mdev)
|
|
return 0;
|
|
if (info->idx < info->start_idx) {
|
|
info->idx++;
|
|
return 0;
|
|
}
|
|
err = vdpa_dev_fill(vdev, info->msg, NETLINK_CB(info->cb->skb).portid,
|
|
info->cb->nlh->nlmsg_seq, NLM_F_MULTI, info->cb->extack);
|
|
if (err)
|
|
return err;
|
|
|
|
info->idx++;
|
|
return 0;
|
|
}
|
|
|
|
static int vdpa_nl_cmd_dev_get_dumpit(struct sk_buff *msg, struct netlink_callback *cb)
|
|
{
|
|
struct vdpa_dev_dump_info info;
|
|
|
|
info.msg = msg;
|
|
info.cb = cb;
|
|
info.start_idx = cb->args[0];
|
|
info.idx = 0;
|
|
|
|
mutex_lock(&vdpa_dev_mutex);
|
|
bus_for_each_dev(&vdpa_bus, NULL, &info, vdpa_dev_dump);
|
|
mutex_unlock(&vdpa_dev_mutex);
|
|
cb->args[0] = info.idx;
|
|
return msg->len;
|
|
}
|
|
|
|
static int vdpa_dev_net_mq_config_fill(struct vdpa_device *vdev,
|
|
struct sk_buff *msg, u64 features,
|
|
const struct virtio_net_config *config)
|
|
{
|
|
u16 val_u16;
|
|
|
|
if ((features & BIT_ULL(VIRTIO_NET_F_MQ)) == 0)
|
|
return 0;
|
|
|
|
val_u16 = le16_to_cpu(config->max_virtqueue_pairs);
|
|
return nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MAX_VQP, val_u16);
|
|
}
|
|
|
|
static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *msg)
|
|
{
|
|
struct virtio_net_config config = {};
|
|
u64 features;
|
|
u16 val_u16;
|
|
|
|
vdpa_get_config_unlocked(vdev, 0, &config, sizeof(config));
|
|
|
|
if (nla_put(msg, VDPA_ATTR_DEV_NET_CFG_MACADDR, sizeof(config.mac),
|
|
config.mac))
|
|
return -EMSGSIZE;
|
|
|
|
val_u16 = le16_to_cpu(config.status);
|
|
if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_STATUS, val_u16))
|
|
return -EMSGSIZE;
|
|
|
|
val_u16 = le16_to_cpu(config.mtu);
|
|
if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MTU, val_u16))
|
|
return -EMSGSIZE;
|
|
|
|
features = vdev->config->get_driver_features(vdev);
|
|
if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES, features,
|
|
VDPA_ATTR_PAD))
|
|
return -EMSGSIZE;
|
|
|
|
return vdpa_dev_net_mq_config_fill(vdev, msg, features, &config);
|
|
}
|
|
|
|
static int
|
|
vdpa_dev_config_fill(struct vdpa_device *vdev, struct sk_buff *msg, u32 portid, u32 seq,
|
|
int flags, struct netlink_ext_ack *extack)
|
|
{
|
|
u32 device_id;
|
|
void *hdr;
|
|
u8 status;
|
|
int err;
|
|
|
|
mutex_lock(&vdev->cf_mutex);
|
|
status = vdev->config->get_status(vdev);
|
|
if (!(status & VIRTIO_CONFIG_S_FEATURES_OK)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Features negotiation not completed");
|
|
err = -EAGAIN;
|
|
goto out;
|
|
}
|
|
|
|
hdr = genlmsg_put(msg, portid, seq, &vdpa_nl_family, flags,
|
|
VDPA_CMD_DEV_CONFIG_GET);
|
|
if (!hdr) {
|
|
err = -EMSGSIZE;
|
|
goto out;
|
|
}
|
|
|
|
if (nla_put_string(msg, VDPA_ATTR_DEV_NAME, dev_name(&vdev->dev))) {
|
|
err = -EMSGSIZE;
|
|
goto msg_err;
|
|
}
|
|
|
|
device_id = vdev->config->get_device_id(vdev);
|
|
if (nla_put_u32(msg, VDPA_ATTR_DEV_ID, device_id)) {
|
|
err = -EMSGSIZE;
|
|
goto msg_err;
|
|
}
|
|
|
|
switch (device_id) {
|
|
case VIRTIO_ID_NET:
|
|
err = vdpa_dev_net_config_fill(vdev, msg);
|
|
break;
|
|
default:
|
|
err = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
if (err)
|
|
goto msg_err;
|
|
|
|
mutex_unlock(&vdev->cf_mutex);
|
|
genlmsg_end(msg, hdr);
|
|
return 0;
|
|
|
|
msg_err:
|
|
genlmsg_cancel(msg, hdr);
|
|
out:
|
|
mutex_unlock(&vdev->cf_mutex);
|
|
return err;
|
|
}
|
|
|
|
static int vdpa_nl_cmd_dev_config_get_doit(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct vdpa_device *vdev;
|
|
struct sk_buff *msg;
|
|
const char *devname;
|
|
struct device *dev;
|
|
int err;
|
|
|
|
if (!info->attrs[VDPA_ATTR_DEV_NAME])
|
|
return -EINVAL;
|
|
devname = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]);
|
|
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
mutex_lock(&vdpa_dev_mutex);
|
|
dev = bus_find_device(&vdpa_bus, NULL, devname, vdpa_name_match);
|
|
if (!dev) {
|
|
NL_SET_ERR_MSG_MOD(info->extack, "device not found");
|
|
err = -ENODEV;
|
|
goto dev_err;
|
|
}
|
|
vdev = container_of(dev, struct vdpa_device, dev);
|
|
if (!vdev->mdev) {
|
|
NL_SET_ERR_MSG_MOD(info->extack, "unmanaged vdpa device");
|
|
err = -EINVAL;
|
|
goto mdev_err;
|
|
}
|
|
err = vdpa_dev_config_fill(vdev, msg, info->snd_portid, info->snd_seq,
|
|
0, info->extack);
|
|
if (!err)
|
|
err = genlmsg_reply(msg, info);
|
|
|
|
mdev_err:
|
|
put_device(dev);
|
|
dev_err:
|
|
mutex_unlock(&vdpa_dev_mutex);
|
|
if (err)
|
|
nlmsg_free(msg);
|
|
return err;
|
|
}
|
|
|
|
static int vdpa_dev_config_dump(struct device *dev, void *data)
|
|
{
|
|
struct vdpa_device *vdev = container_of(dev, struct vdpa_device, dev);
|
|
struct vdpa_dev_dump_info *info = data;
|
|
int err;
|
|
|
|
if (!vdev->mdev)
|
|
return 0;
|
|
if (info->idx < info->start_idx) {
|
|
info->idx++;
|
|
return 0;
|
|
}
|
|
err = vdpa_dev_config_fill(vdev, info->msg, NETLINK_CB(info->cb->skb).portid,
|
|
info->cb->nlh->nlmsg_seq, NLM_F_MULTI,
|
|
info->cb->extack);
|
|
if (err)
|
|
return err;
|
|
|
|
info->idx++;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
vdpa_nl_cmd_dev_config_get_dumpit(struct sk_buff *msg, struct netlink_callback *cb)
|
|
{
|
|
struct vdpa_dev_dump_info info;
|
|
|
|
info.msg = msg;
|
|
info.cb = cb;
|
|
info.start_idx = cb->args[0];
|
|
info.idx = 0;
|
|
|
|
mutex_lock(&vdpa_dev_mutex);
|
|
bus_for_each_dev(&vdpa_bus, NULL, &info, vdpa_dev_config_dump);
|
|
mutex_unlock(&vdpa_dev_mutex);
|
|
cb->args[0] = info.idx;
|
|
return msg->len;
|
|
}
|
|
|
|
static const struct nla_policy vdpa_nl_policy[VDPA_ATTR_MAX + 1] = {
|
|
[VDPA_ATTR_MGMTDEV_BUS_NAME] = { .type = NLA_NUL_STRING },
|
|
[VDPA_ATTR_MGMTDEV_DEV_NAME] = { .type = NLA_STRING },
|
|
[VDPA_ATTR_DEV_NAME] = { .type = NLA_STRING },
|
|
[VDPA_ATTR_DEV_NET_CFG_MACADDR] = NLA_POLICY_ETH_ADDR,
|
|
/* virtio spec 1.1 section 5.1.4.1 for valid MTU range */
|
|
[VDPA_ATTR_DEV_NET_CFG_MTU] = NLA_POLICY_MIN(NLA_U16, 68),
|
|
};
|
|
|
|
static const struct genl_ops vdpa_nl_ops[] = {
|
|
{
|
|
.cmd = VDPA_CMD_MGMTDEV_GET,
|
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
|
|
.doit = vdpa_nl_cmd_mgmtdev_get_doit,
|
|
.dumpit = vdpa_nl_cmd_mgmtdev_get_dumpit,
|
|
},
|
|
{
|
|
.cmd = VDPA_CMD_DEV_NEW,
|
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
|
|
.doit = vdpa_nl_cmd_dev_add_set_doit,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = VDPA_CMD_DEV_DEL,
|
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
|
|
.doit = vdpa_nl_cmd_dev_del_set_doit,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = VDPA_CMD_DEV_GET,
|
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
|
|
.doit = vdpa_nl_cmd_dev_get_doit,
|
|
.dumpit = vdpa_nl_cmd_dev_get_dumpit,
|
|
},
|
|
{
|
|
.cmd = VDPA_CMD_DEV_CONFIG_GET,
|
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
|
|
.doit = vdpa_nl_cmd_dev_config_get_doit,
|
|
.dumpit = vdpa_nl_cmd_dev_config_get_dumpit,
|
|
},
|
|
};
|
|
|
|
static struct genl_family vdpa_nl_family __ro_after_init = {
|
|
.name = VDPA_GENL_NAME,
|
|
.version = VDPA_GENL_VERSION,
|
|
.maxattr = VDPA_ATTR_MAX,
|
|
.policy = vdpa_nl_policy,
|
|
.netnsok = false,
|
|
.module = THIS_MODULE,
|
|
.ops = vdpa_nl_ops,
|
|
.n_ops = ARRAY_SIZE(vdpa_nl_ops),
|
|
};
|
|
|
|
static int vdpa_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = bus_register(&vdpa_bus);
|
|
if (err)
|
|
return err;
|
|
err = genl_register_family(&vdpa_nl_family);
|
|
if (err)
|
|
goto err;
|
|
return 0;
|
|
|
|
err:
|
|
bus_unregister(&vdpa_bus);
|
|
return err;
|
|
}
|
|
|
|
static void __exit vdpa_exit(void)
|
|
{
|
|
genl_unregister_family(&vdpa_nl_family);
|
|
bus_unregister(&vdpa_bus);
|
|
ida_destroy(&vdpa_index_ida);
|
|
}
|
|
core_initcall(vdpa_init);
|
|
module_exit(vdpa_exit);
|
|
|
|
MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>");
|
|
MODULE_LICENSE("GPL v2");
|