1 // SPDX-License-Identifier: GPL-2.0-only
3 * VDPA simulator for networking device.
5 * Copyright (c) 2020, Red Hat Inc. All rights reserved.
6 * Author: Jason Wang <jasowang@redhat.com>
10 #include <linux/init.h>
11 #include <linux/module.h>
12 #include <linux/device.h>
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
15 #include <linux/etherdevice.h>
16 #include <linux/vringh.h>
17 #include <linux/vdpa.h>
18 #include <uapi/linux/virtio_net.h>
22 #define DRV_VERSION "0.1"
23 #define DRV_AUTHOR "Jason Wang <jasowang@redhat.com>"
24 #define DRV_DESC "vDPA Device Simulator for networking device"
25 #define DRV_LICENSE "GPL v2"
27 #define VDPASIM_NET_FEATURES (VDPASIM_FEATURES | \
28 (1ULL << VIRTIO_NET_F_MAC))
30 #define VDPASIM_NET_VQ_NUM 2
33 module_param(macaddr, charp, 0);
34 MODULE_PARM_DESC(macaddr, "Ethernet MAC address");
36 static u8 macaddr_buf[ETH_ALEN];
38 static void vdpasim_net_work(struct work_struct *work)
40 struct vdpasim *vdpasim = container_of(work, struct vdpasim, work);
41 struct vdpasim_virtqueue *txq = &vdpasim->vqs[1];
42 struct vdpasim_virtqueue *rxq = &vdpasim->vqs[0];
48 spin_lock(&vdpasim->lock);
50 if (!(vdpasim->status & VIRTIO_CONFIG_S_DRIVER_OK))
53 if (!txq->ready || !rxq->ready)
58 err = vringh_getdesc_iotlb(&txq->vring, &txq->out_iov, NULL,
59 &txq->head, GFP_ATOMIC);
63 err = vringh_getdesc_iotlb(&rxq->vring, NULL, &rxq->in_iov,
64 &rxq->head, GFP_ATOMIC);
66 vringh_complete_iotlb(&txq->vring, txq->head, 0);
71 read = vringh_iov_pull_iotlb(&txq->vring, &txq->out_iov,
77 write = vringh_iov_push_iotlb(&rxq->vring, &rxq->in_iov,
78 vdpasim->buffer, read);
85 /* Make sure data is wrote before advancing index */
88 vringh_complete_iotlb(&txq->vring, txq->head, 0);
89 vringh_complete_iotlb(&rxq->vring, rxq->head, total_write);
91 /* Make sure used is visible before rasing the interrupt. */
95 if (vringh_need_notify_iotlb(&txq->vring) > 0)
96 vringh_notify(&txq->vring);
97 if (vringh_need_notify_iotlb(&rxq->vring) > 0)
98 vringh_notify(&rxq->vring);
102 schedule_work(&vdpasim->work);
108 spin_unlock(&vdpasim->lock);
111 static void vdpasim_net_get_config(struct vdpasim *vdpasim, void *config)
113 struct virtio_net_config *net_config =
114 (struct virtio_net_config *)config;
116 net_config->mtu = cpu_to_vdpasim16(vdpasim, 1500);
117 net_config->status = cpu_to_vdpasim16(vdpasim, VIRTIO_NET_S_LINK_UP);
118 memcpy(net_config->mac, macaddr_buf, ETH_ALEN);
121 static void vdpasim_net_mgmtdev_release(struct device *dev)
125 static struct device vdpasim_net_mgmtdev = {
126 .init_name = "vdpasim_net",
127 .release = vdpasim_net_mgmtdev_release,
130 static int vdpasim_net_dev_add(struct vdpa_mgmt_dev *mdev, const char *name)
132 struct vdpasim_dev_attr dev_attr = {};
133 struct vdpasim *simdev;
136 dev_attr.mgmt_dev = mdev;
137 dev_attr.name = name;
138 dev_attr.id = VIRTIO_ID_NET;
139 dev_attr.supported_features = VDPASIM_NET_FEATURES;
140 dev_attr.nvqs = VDPASIM_NET_VQ_NUM;
141 dev_attr.config_size = sizeof(struct virtio_net_config);
142 dev_attr.get_config = vdpasim_net_get_config;
143 dev_attr.work_fn = vdpasim_net_work;
144 dev_attr.buffer_size = PAGE_SIZE;
146 simdev = vdpasim_create(&dev_attr);
148 return PTR_ERR(simdev);
150 ret = _vdpa_register_device(&simdev->vdpa);
157 put_device(&simdev->vdpa.dev);
161 static void vdpasim_net_dev_del(struct vdpa_mgmt_dev *mdev,
162 struct vdpa_device *dev)
164 struct vdpasim *simdev = container_of(dev, struct vdpasim, vdpa);
166 _vdpa_unregister_device(&simdev->vdpa);
169 static const struct vdpa_mgmtdev_ops vdpasim_net_mgmtdev_ops = {
170 .dev_add = vdpasim_net_dev_add,
171 .dev_del = vdpasim_net_dev_del
174 static struct virtio_device_id id_table[] = {
175 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
179 static struct vdpa_mgmt_dev mgmt_dev = {
180 .device = &vdpasim_net_mgmtdev,
181 .id_table = id_table,
182 .ops = &vdpasim_net_mgmtdev_ops,
185 static int __init vdpasim_net_init(void)
190 mac_pton(macaddr, macaddr_buf);
191 if (!is_valid_ether_addr(macaddr_buf))
192 return -EADDRNOTAVAIL;
194 eth_random_addr(macaddr_buf);
197 ret = device_register(&vdpasim_net_mgmtdev);
201 ret = vdpa_mgmtdev_register(&mgmt_dev);
207 device_unregister(&vdpasim_net_mgmtdev);
211 static void __exit vdpasim_net_exit(void)
213 vdpa_mgmtdev_unregister(&mgmt_dev);
214 device_unregister(&vdpasim_net_mgmtdev);
217 module_init(vdpasim_net_init);
218 module_exit(vdpasim_net_exit);
220 MODULE_VERSION(DRV_VERSION);
221 MODULE_LICENSE(DRV_LICENSE);
222 MODULE_AUTHOR(DRV_AUTHOR);
223 MODULE_DESCRIPTION(DRV_DESC);