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tap: introduce a helper to get the name of an interface

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This patch introduces a helper tap_get_ifname() to get the device name of tap
device. This is needed when ifname is unspecified in the command line and qemu
were asked to create tap device by itself. In this situation, the name were
allocated by kernel, so if multiqueue is asked, we need to fetch its name after
creating the first queue.

Only linux has this support since it's the only platform that supports
multiqueue tap.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jason Wang 2013-01-30 19:12:33 +08:00 • committed by Anthony Liguori
parent 16dbaf905b
commit e5dc0b402e
7 changed files with 33 additions and 0 deletions
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13
net/tap-linux.c
View file

@ -261,3 +261,16 @@ int tap_fd_disable(int fd)
return ret;
}
int tap_fd_get_ifname(int fd, char *ifname)
{
struct ifreq ifr;
if (ioctl(fd, TUNGETIFF, &ifr) != 0) {
error_report("TUNGETIFF ioctl() failed: %s",
strerror(errno));
return -1;
}
pstrcpy(ifname, sizeof(ifr.ifr_name), ifr.ifr_name);
return 0;
}