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tap-linux: Get features once and use it many times

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Signed-off-by: Kusanagi Kouichi <slash@ac.auone-net.jp>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kusanagi Kouichi 2014-01-18 14:38:45 +09:00 committed by Stefan Hajnoczi
parent c444dfabfc
commit 1f149e721f
1 changed files with 8 additions and 6 deletions
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14
net/tap-linux.c
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@ -52,14 +52,17 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
if (ioctl(fd, TUNGETFEATURES, &features) == 0 &&
features & IFF_ONE_QUEUE) {
if (ioctl(fd, TUNGETFEATURES, &features) == -1) {
error_report("warning: TUNGETFEATURES failed: %s", strerror(errno));
features = 0;
}
if (features & IFF_ONE_QUEUE) {
ifr.ifr_flags |= IFF_ONE_QUEUE;
}
if (*vnet_hdr) {
if (ioctl(fd, TUNGETFEATURES, &features) == 0 &&
features & IFF_VNET_HDR) {
if (features & IFF_VNET_HDR) {
*vnet_hdr = 1;
ifr.ifr_flags |= IFF_VNET_HDR;
} else {
@ -82,8 +85,7 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
}
if (mq_required) {
if ((ioctl(fd, TUNGETFEATURES, &features) != 0) ||
!(features & IFF_MULTI_QUEUE)) {
if (!(features & IFF_MULTI_QUEUE)) {
error_report("multiqueue required, but no kernel "
"support for IFF_MULTI_QUEUE available");
close(fd);