diff options
Diffstat (limited to 'net.c')
| -rw-r--r-- | net.c | 83 |
1 files changed, 70 insertions, 13 deletions
@@ -1260,14 +1260,20 @@ void do_info_usernet(Monitor *mon) #if !defined(_WIN32) +/* Maximum GSO packet size (64k) plus plenty of room for + * the ethernet and virtio_net headers + */ +#define TAP_BUFSIZE (4096 + 65536) + typedef struct TAPState { VLANClientState *vc; int fd; char down_script[1024]; char down_script_arg[128]; - uint8_t buf[4096]; + uint8_t buf[TAP_BUFSIZE]; unsigned int read_poll : 1; unsigned int write_poll : 1; + unsigned int has_vnet_hdr : 1; } TAPState; static int launch_script(const char *setup_script, const char *ifname, int fd); @@ -1326,15 +1332,33 @@ static ssize_t tap_receive_iov(VLANClientState *vc, const struct iovec *iov, int iovcnt) { TAPState *s = vc->opaque; + const struct iovec *iovp = iov; + struct iovec iov_copy[iovcnt + 1]; + struct virtio_net_hdr hdr = { 0, }; - return tap_write_packet(s, iov, iovcnt); + if (s->has_vnet_hdr) { + iov_copy[0].iov_base = &hdr; + iov_copy[0].iov_len = sizeof(hdr); + memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov)); + iovp = iov_copy; + iovcnt++; + } + + return tap_write_packet(s, iovp, iovcnt); } static ssize_t tap_receive(VLANClientState *vc, const uint8_t *buf, size_t size) { TAPState *s = vc->opaque; - struct iovec iov[1]; + struct iovec iov[2]; int iovcnt = 0; + struct virtio_net_hdr hdr = { 0, }; + + if (s->has_vnet_hdr) { + iov[iovcnt].iov_base = &hdr; + iov[iovcnt].iov_len = sizeof(hdr); + iovcnt++; + } iov[iovcnt].iov_base = (char *)buf; iov[iovcnt].iov_len = size; @@ -1380,12 +1404,19 @@ static void tap_send(void *opaque) int size; do { + uint8_t *buf = s->buf; + size = tap_read_packet(s->fd, s->buf, sizeof(s->buf)); if (size <= 0) { break; } - size = qemu_send_packet_async(s->vc, s->buf, size, tap_send_completed); + if (s->has_vnet_hdr) { + buf += sizeof(struct virtio_net_hdr); + size -= sizeof(struct virtio_net_hdr); + } + + size = qemu_send_packet_async(s->vc, buf, size, tap_send_completed); if (size == 0) { tap_read_poll(s, 0); } @@ -1415,6 +1446,18 @@ static int tap_set_sndbuf(TAPState *s, QemuOpts *opts) return 0; } +static int tap_probe_vnet_hdr(int fd) +{ + struct ifreq ifr; + + if (ioctl(fd, TUNGETIFF, &ifr) != 0) { + qemu_error("TUNGETIFF ioctl() failed: %s\n", strerror(errno)); + return 0; + } + + return ifr.ifr_flags & IFF_VNET_HDR; +} + static void tap_cleanup(VLANClientState *vc) { TAPState *s = vc->opaque; @@ -1435,12 +1478,14 @@ static void tap_cleanup(VLANClientState *vc) static TAPState *net_tap_fd_init(VLANState *vlan, const char *model, const char *name, - int fd) + int fd, + int vnet_hdr) { TAPState *s; s = qemu_mallocz(sizeof(TAPState)); s->fd = fd; + s->has_vnet_hdr = vnet_hdr != 0; s->vc = qemu_new_vlan_client(vlan, NULL, model, name, NULL, tap_receive, tap_receive_iov, tap_cleanup, s); @@ -1450,7 +1495,7 @@ static TAPState *net_tap_fd_init(VLANState *vlan, } #if defined (CONFIG_BSD) || defined (__FreeBSD_kernel__) -static int tap_open(char *ifname, int ifname_size) +static int tap_open(char *ifname, int ifname_size, int *vnet_hdr) { int fd; char *dev; @@ -1592,7 +1637,7 @@ static int tap_alloc(char *dev, size_t dev_size) return tap_fd; } -static int tap_open(char *ifname, int ifname_size) +static int tap_open(char *ifname, int ifname_size, int *vnet_hdr) { char dev[10]=""; int fd; @@ -1605,13 +1650,13 @@ static int tap_open(char *ifname, int ifname_size) return fd; } #elif defined (_AIX) -static int tap_open(char *ifname, int ifname_size) +static int tap_open(char *ifname, int ifname_size, int *vnet_hdr) { fprintf (stderr, "no tap on AIX\n"); return -1; } #else -static int tap_open(char *ifname, int ifname_size) +static int tap_open(char *ifname, int ifname_size, int *vnet_hdr) { struct ifreq ifr; int fd, ret; @@ -1623,6 +1668,17 @@ static int tap_open(char *ifname, int ifname_size) } memset(&ifr, 0, sizeof(ifr)); ifr.ifr_flags = IFF_TAP | IFF_NO_PI; + + { + unsigned int features; + + if (ioctl(fd, TUNGETFEATURES, &features) == 0 && + features & IFF_VNET_HDR) { + *vnet_hdr = 1; + ifr.ifr_flags |= IFF_VNET_HDR; + } + } + if (ifname[0] != '\0') pstrcpy(ifr.ifr_name, IFNAMSIZ, ifname); else @@ -1688,14 +1744,15 @@ static TAPState *net_tap_init(VLANState *vlan, const char *model, const char *setup_script, const char *down_script) { TAPState *s; - int fd; + int fd, vnet_hdr; char ifname[128]; if (ifname1 != NULL) pstrcpy(ifname, sizeof(ifname), ifname1); else ifname[0] = '\0'; - TFR(fd = tap_open(ifname, sizeof(ifname))); + vnet_hdr = 0; + TFR(fd = tap_open(ifname, sizeof(ifname), &vnet_hdr)); if (fd < 0) return NULL; @@ -1705,7 +1762,7 @@ static TAPState *net_tap_init(VLANState *vlan, const char *model, launch_script(setup_script, ifname, fd)) { return NULL; } - s = net_tap_fd_init(vlan, model, name, fd); + s = net_tap_fd_init(vlan, model, name, fd, vnet_hdr); snprintf(s->vc->info_str, sizeof(s->vc->info_str), "ifname=%s,script=%s,downscript=%s", ifname, setup_script, down_script); @@ -2659,7 +2716,7 @@ static int net_init_tap(QemuOpts *opts, fcntl(fd, F_SETFL, O_NONBLOCK); - s = net_tap_fd_init(vlan, "tap", name, fd); + s = net_tap_fd_init(vlan, "tap", name, fd, tap_probe_vnet_hdr(fd)); if (!s) { close(fd); } |