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
|
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2016 Intel Corporation
*/
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <errno.h>
#include <string.h>
#include <limits.h>
#include <rte_ether.h>
#include "vhost_kernel_tap.h"
#include "../virtio_logs.h"
#include "../virtio_pci.h"
static int
vhost_kernel_tap_set_offload(int fd, uint64_t features)
{
unsigned int offload = 0;
if (features & (1ULL << VIRTIO_NET_F_GUEST_CSUM)) {
offload |= TUN_F_CSUM;
if (features & (1ULL << VIRTIO_NET_F_GUEST_TSO4))
offload |= TUN_F_TSO4;
if (features & (1ULL << VIRTIO_NET_F_GUEST_TSO6))
offload |= TUN_F_TSO6;
if (features & ((1ULL << VIRTIO_NET_F_GUEST_TSO4) |
(1ULL << VIRTIO_NET_F_GUEST_TSO6)) &&
(features & (1ULL << VIRTIO_NET_F_GUEST_ECN)))
offload |= TUN_F_TSO_ECN;
if (features & (1ULL << VIRTIO_NET_F_GUEST_UFO))
offload |= TUN_F_UFO;
}
if (offload != 0) {
/* Check if our kernel supports TUNSETOFFLOAD */
if (ioctl(fd, TUNSETOFFLOAD, 0) != 0 && errno == EINVAL) {
PMD_DRV_LOG(ERR, "Kernel does't support TUNSETOFFLOAD\n");
return -ENOTSUP;
}
if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
offload &= ~TUN_F_UFO;
if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
PMD_DRV_LOG(ERR, "TUNSETOFFLOAD ioctl() failed: %s\n",
strerror(errno));
return -1;
}
}
}
return 0;
}
int
vhost_kernel_open_tap(char **p_ifname, int hdr_size, int req_mq,
const char *mac, uint64_t features)
{
unsigned int tap_features;
char *tap_name = NULL;
int sndbuf = INT_MAX;
struct ifreq ifr;
int tapfd;
/* TODO:
* 1. verify we can get/set vnet_hdr_len, tap_probe_vnet_hdr_len
* 2. get number of memory regions from vhost module parameter
* max_mem_regions, supported in newer version linux kernel
*/
tapfd = open(PATH_NET_TUN, O_RDWR);
if (tapfd < 0) {
PMD_DRV_LOG(ERR, "fail to open %s: %s",
PATH_NET_TUN, strerror(errno));
return -1;
}
/* Construct ifr */
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
if (ioctl(tapfd, TUNGETFEATURES, &tap_features) == -1) {
PMD_DRV_LOG(ERR, "TUNGETFEATURES failed: %s", strerror(errno));
goto error;
}
if (tap_features & IFF_ONE_QUEUE)
ifr.ifr_flags |= IFF_ONE_QUEUE;
/* Let tap instead of vhost-net handle vnet header, as the latter does
* not support offloading. And in this case, we should not set feature
* bit VHOST_NET_F_VIRTIO_NET_HDR.
*/
if (tap_features & IFF_VNET_HDR) {
ifr.ifr_flags |= IFF_VNET_HDR;
} else {
PMD_DRV_LOG(ERR, "TAP does not support IFF_VNET_HDR");
goto error;
}
if (req_mq)
ifr.ifr_flags |= IFF_MULTI_QUEUE;
if (*p_ifname)
strncpy(ifr.ifr_name, *p_ifname, IFNAMSIZ - 1);
else
strncpy(ifr.ifr_name, "tap%d", IFNAMSIZ - 1);
if (ioctl(tapfd, TUNSETIFF, (void *)&ifr) == -1) {
PMD_DRV_LOG(ERR, "TUNSETIFF failed: %s", strerror(errno));
goto error;
}
tap_name = strdup(ifr.ifr_name);
if (!tap_name) {
PMD_DRV_LOG(ERR, "strdup ifname failed: %s", strerror(errno));
goto error;
}
fcntl(tapfd, F_SETFL, O_NONBLOCK);
if (ioctl(tapfd, TUNSETVNETHDRSZ, &hdr_size) < 0) {
PMD_DRV_LOG(ERR, "TUNSETVNETHDRSZ failed: %s", strerror(errno));
goto error;
}
if (ioctl(tapfd, TUNSETSNDBUF, &sndbuf) < 0) {
PMD_DRV_LOG(ERR, "TUNSETSNDBUF failed: %s", strerror(errno));
goto error;
}
vhost_kernel_tap_set_offload(tapfd, features);
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
memcpy(ifr.ifr_hwaddr.sa_data, mac, ETHER_ADDR_LEN);
if (ioctl(tapfd, SIOCSIFHWADDR, (void *)&ifr) == -1) {
PMD_DRV_LOG(ERR, "SIOCSIFHWADDR failed: %s", strerror(errno));
goto error;
}
free(*p_ifname);
*p_ifname = tap_name;
return tapfd;
error:
free(tap_name);
close(tapfd);
return -1;
}
|
