1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* VDPA simulator for networking device.
*
* Copyright (c) 2020, Red Hat Inc. All rights reserved.
* Author: Jason Wang <jasowang@redhat.com>
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/etherdevice.h>
#include <linux/vringh.h>
#include <linux/vdpa.h>
#include <uapi/linux/virtio_net.h>
#include "vdpa_sim.h"
#define DRV_VERSION "0.1"
#define DRV_AUTHOR "Jason Wang <jasowang@redhat.com>"
#define DRV_DESC "vDPA Device Simulator for networking device"
#define DRV_LICENSE "GPL v2"
#define VDPASIM_NET_FEATURES (VDPASIM_FEATURES | \
(1ULL << VIRTIO_NET_F_MAC))
#define VDPASIM_NET_VQ_NUM 2
static char *macaddr;
module_param(macaddr, charp, 0);
MODULE_PARM_DESC(macaddr, "Ethernet MAC address");
static u8 macaddr_buf[ETH_ALEN];
static void vdpasim_net_work(struct work_struct *work)
{
struct vdpasim *vdpasim = container_of(work, struct vdpasim, work);
struct vdpasim_virtqueue *txq = &vdpasim->vqs[1];
struct vdpasim_virtqueue *rxq = &vdpasim->vqs[0];
ssize_t read, write;
size_t total_write;
int pkts = 0;
int err;
spin_lock(&vdpasim->lock);
if (!(vdpasim->status & VIRTIO_CONFIG_S_DRIVER_OK))
goto out;
if (!txq->ready || !rxq->ready)
goto out;
while (true) {
total_write = 0;
err = vringh_getdesc_iotlb(&txq->vring, &txq->out_iov, NULL,
&txq->head, GFP_ATOMIC);
if (err <= 0)
break;
err = vringh_getdesc_iotlb(&rxq->vring, NULL, &rxq->in_iov,
&rxq->head, GFP_ATOMIC);
if (err <= 0) {
vringh_complete_iotlb(&txq->vring, txq->head, 0);
break;
}
while (true) {
read = vringh_iov_pull_iotlb(&txq->vring, &txq->out_iov,
vdpasim->buffer,
PAGE_SIZE);
if (read <= 0)
break;
write = vringh_iov_push_iotlb(&rxq->vring, &rxq->in_iov,
vdpasim->buffer, read);
if (write <= 0)
break;
total_write += write;
}
/* Make sure data is wrote before advancing index */
smp_wmb();
vringh_complete_iotlb(&txq->vring, txq->head, 0);
vringh_complete_iotlb(&rxq->vring, rxq->head, total_write);
/* Make sure used is visible before rasing the interrupt. */
smp_wmb();
local_bh_disable();
if (vringh_need_notify_iotlb(&txq->vring) > 0)
vringh_notify(&txq->vring);
if (vringh_need_notify_iotlb(&rxq->vring) > 0)
vringh_notify(&rxq->vring);
local_bh_enable();
if (++pkts > 4) {
schedule_work(&vdpasim->work);
goto out;
}
}
out:
spin_unlock(&vdpasim->lock);
}
static void vdpasim_net_get_config(struct vdpasim *vdpasim, void *config)
{
struct virtio_net_config *net_config =
(struct virtio_net_config *)config;
net_config->mtu = cpu_to_vdpasim16(vdpasim, 1500);
net_config->status = cpu_to_vdpasim16(vdpasim, VIRTIO_NET_S_LINK_UP);
memcpy(net_config->mac, macaddr_buf, ETH_ALEN);
}
static void vdpasim_net_mgmtdev_release(struct device *dev)
{
}
static struct device vdpasim_net_mgmtdev = {
.init_name = "vdpasim_net",
.release = vdpasim_net_mgmtdev_release,
};
static int vdpasim_net_dev_add(struct vdpa_mgmt_dev *mdev, const char *name)
{
struct vdpasim_dev_attr dev_attr = {};
struct vdpasim *simdev;
int ret;
dev_attr.mgmt_dev = mdev;
dev_attr.name = name;
dev_attr.id = VIRTIO_ID_NET;
dev_attr.supported_features = VDPASIM_NET_FEATURES;
dev_attr.nvqs = VDPASIM_NET_VQ_NUM;
dev_attr.config_size = sizeof(struct virtio_net_config);
dev_attr.get_config = vdpasim_net_get_config;
dev_attr.work_fn = vdpasim_net_work;
dev_attr.buffer_size = PAGE_SIZE;
simdev = vdpasim_create(&dev_attr);
if (IS_ERR(simdev))
return PTR_ERR(simdev);
ret = _vdpa_register_device(&simdev->vdpa);
if (ret)
goto reg_err;
return 0;
reg_err:
put_device(&simdev->vdpa.dev);
return ret;
}
static void vdpasim_net_dev_del(struct vdpa_mgmt_dev *mdev,
struct vdpa_device *dev)
{
struct vdpasim *simdev = container_of(dev, struct vdpasim, vdpa);
_vdpa_unregister_device(&simdev->vdpa);
}
static const struct vdpa_mgmtdev_ops vdpasim_net_mgmtdev_ops = {
.dev_add = vdpasim_net_dev_add,
.dev_del = vdpasim_net_dev_del
};
static struct virtio_device_id id_table[] = {
{ VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
{ 0 },
};
static struct vdpa_mgmt_dev mgmt_dev = {
.device = &vdpasim_net_mgmtdev,
.id_table = id_table,
.ops = &vdpasim_net_mgmtdev_ops,
};
static int __init vdpasim_net_init(void)
{
int ret;
if (macaddr) {
mac_pton(macaddr, macaddr_buf);
if (!is_valid_ether_addr(macaddr_buf))
return -EADDRNOTAVAIL;
} else {
eth_random_addr(macaddr_buf);
}
ret = device_register(&vdpasim_net_mgmtdev);
if (ret)
return ret;
ret = vdpa_mgmtdev_register(&mgmt_dev);
if (ret)
goto parent_err;
return 0;
parent_err:
device_unregister(&vdpasim_net_mgmtdev);
return ret;
}
static void __exit vdpasim_net_exit(void)
{
vdpa_mgmtdev_unregister(&mgmt_dev);
device_unregister(&vdpasim_net_mgmtdev);
}
module_init(vdpasim_net_init);
module_exit(vdpasim_net_exit);
MODULE_VERSION(DRV_VERSION);
MODULE_LICENSE(DRV_LICENSE);
MODULE_AUTHOR(DRV_AUTHOR);
MODULE_DESCRIPTION(DRV_DESC);
|
