tap-linux.c (264986e2c8f14a0f4a32ac6f1e083905833a5fc7) tap-linux.c (d26e445c80fddcc7483b83f3115e5067fef28fe6)
1/*
2 * QEMU System Emulator
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 * Copyright (c) 2009 Red Hat, Inc.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal

--- 28 unchanged lines hidden (view full) ---

37#define PATH_NET_TUN "/dev/net/tun"
38
39int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
40 int vnet_hdr_required, int mq_required)
41{
42 struct ifreq ifr;
43 int fd, ret;
44 int len = sizeof(struct virtio_net_hdr);
1/*
2 * QEMU System Emulator
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 * Copyright (c) 2009 Red Hat, Inc.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal

--- 28 unchanged lines hidden (view full) ---

37#define PATH_NET_TUN "/dev/net/tun"
38
39int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
40 int vnet_hdr_required, int mq_required)
41{
42 struct ifreq ifr;
43 int fd, ret;
44 int len = sizeof(struct virtio_net_hdr);
45 unsigned int features;
45
46 TFR(fd = open(PATH_NET_TUN, O_RDWR));
47 if (fd < 0) {
48 error_report("could not open %s: %m", PATH_NET_TUN);
49 return -1;
50 }
51 memset(&ifr, 0, sizeof(ifr));
52 ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
53
46
47 TFR(fd = open(PATH_NET_TUN, O_RDWR));
48 if (fd < 0) {
49 error_report("could not open %s: %m", PATH_NET_TUN);
50 return -1;
51 }
52 memset(&ifr, 0, sizeof(ifr));
53 ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
54
54 if (*vnet_hdr) {
55 unsigned int features;
55 if (ioctl(fd, TUNGETFEATURES, &features) == 0 &&
56 features & IFF_ONE_QUEUE) {
57 ifr.ifr_flags |= IFF_ONE_QUEUE;
58 }
56
59
60 if (*vnet_hdr) {
57 if (ioctl(fd, TUNGETFEATURES, &features) == 0 &&
58 features & IFF_VNET_HDR) {
59 *vnet_hdr = 1;
60 ifr.ifr_flags |= IFF_VNET_HDR;
61 } else {
62 *vnet_hdr = 0;
63 }
64

--- 8 unchanged lines hidden (view full) ---

73 * tap it might have been modified e.g. by another instance of qemu.
74 * Ignore errors since old kernels do not support this ioctl: in this
75 * case the header size implicitly has the correct value.
76 */
77 ioctl(fd, TUNSETVNETHDRSZ, &len);
78 }
79
80 if (mq_required) {
61 if (ioctl(fd, TUNGETFEATURES, &features) == 0 &&
62 features & IFF_VNET_HDR) {
63 *vnet_hdr = 1;
64 ifr.ifr_flags |= IFF_VNET_HDR;
65 } else {
66 *vnet_hdr = 0;
67 }
68

--- 8 unchanged lines hidden (view full) ---

77 * tap it might have been modified e.g. by another instance of qemu.
78 * Ignore errors since old kernels do not support this ioctl: in this
79 * case the header size implicitly has the correct value.
80 */
81 ioctl(fd, TUNSETVNETHDRSZ, &len);
82 }
83
84 if (mq_required) {
81 unsigned int features;
82
83 if ((ioctl(fd, TUNGETFEATURES, &features) != 0) ||
84 !(features & IFF_MULTI_QUEUE)) {
85 error_report("multiqueue required, but no kernel "
86 "support for IFF_MULTI_QUEUE available");
87 close(fd);
88 return -1;
89 } else {
90 ifr.ifr_flags |= IFF_MULTI_QUEUE;

--- 186 unchanged lines hidden --- 		85 if ((ioctl(fd, TUNGETFEATURES, &features) != 0) ||
86 !(features & IFF_MULTI_QUEUE)) {
87 error_report("multiqueue required, but no kernel "
88 "support for IFF_MULTI_QUEUE available");
89 close(fd);
90 return -1;
91 } else {
92 ifr.ifr_flags |= IFF_MULTI_QUEUE;

--- 186 unchanged lines hidden ---