By re-attaching RX, TX, and CTL rings during connect() rather than
assuming they are freshly allocated (i.e. assuming the counters are zero),
and avoiding forcing state to Closed in netback_remove() it is possible
for vif instances to be unbound and re-bound from and to (respectively) a
running guest.
Dynamic unbind/bind is a highly useful feature for a backend module as it
allows it to be unloaded and re-loaded (i.e. updated) without requiring
domUs to be halted.
This has been tested by running iperf as a server in the test VM and
then running a client against it in a continuous loop, whilst also
running:
while true;
do echo vif-$DOMID-$VIF >unbind;
echo down;
rmmod xen-netback;
echo unloaded;
modprobe xen-netback;
cd $(pwd);
brctl addif xenbr0 vif$DOMID.$VIF;
ip link set vif$DOMID.$VIF up;
echo up;
sleep 5;
done
in dom0 from /sys/bus/xen-backend/drivers/vif to continuously unbind,
unload, re-load, re-bind and re-plumb the backend.
Clearly a performance drop was seen but no TCP connection resets were
observed during this test and moreover a parallel SSH connection into the
guest remained perfectly usable throughout.
Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Reviewed-by: Wei Liu <wei.liu@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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