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virtio-devices: net: Support rebooting when tap fd specfied

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Duplicate the fd that is specified in the config so that be used again
after a reboot. When rebooting we destroy all VM state and restore from
the config.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2021-04-22 10:24:15 +01:00 committed by Sebastien Boeuf
parent 55e6dbdb06
commit da58b65997
1 changed files with 9 additions and 1 deletions
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10
virtio-devices/src/net.rs
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@ -54,6 +54,9 @@ pub enum Error {
// Using existing tap
TapError(TapError),
// Error calling dup() on tap fd
DuplicateTapFd(std::io::Error),
}
pub type Result<T> = result::Result<T, Error>;
@ -397,7 +400,12 @@ impl Net {
let num_queue_pairs = fds.len();
for fd in fds.iter() {
let tap = Tap::from_tap_fd(*fd, num_queue_pairs).map_err(Error::TapError)?;
// Duplicate so that it can survive reboots
let fd = unsafe { libc::dup(*fd) };
if fd < 0 {
return Err(Error::DuplicateTapFd(std::io::Error::last_os_error()));
}
let tap = Tap::from_tap_fd(fd, num_queue_pairs).map_err(Error::TapError)?;
taps.push(tap);
}