On 11/26/18 11:24 AM, Michal Privoznik wrote:
> On 11/26/18 5:10 PM, Michal Privoznik wrote:
>> On 11/21/18 4:04 PM, Jason Baron wrote:
>>> Guest network devices can set 'overflow' when there are a number of
>>> multicast
>>> ips configured. For virtio_net, the limit is only 64. In this case, the list
>>> of mac addresses is empty and the 'overflow' condition is set. Thus, the
>>> guest
>>> will currently receive no multicast traffic in this state.
>>>
>>> When 'overflow' is set in the guest, let's turn this into ALLMULTI on the
>>> host.
>>>
>>> Signed-off-by: Jason Baron <jba...@akamai.com>
>>> ---
>>> src/qemu/qemu_driver.c | 26 +++++++++++++++++++-------
>>> 1 file changed, 19 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
>>> index 7fb9102..ea36db8 100644
>>> --- a/src/qemu/qemu_driver.c
>>> +++ b/src/qemu/qemu_driver.c
>>> @@ -4443,11 +4443,11 @@ static void
>>> syncNicRxFilterMultiMode(char *ifname, virNetDevRxFilterPtr guestFilter,
>>> virNetDevRxFilterPtr hostFilter)
>>> {
>>> - if (hostFilter->multicast.mode != guestFilter->multicast.mode) {
>>> + if (hostFilter->multicast.mode != guestFilter->multicast.mode ||
>>> + guestFilter->multicast.overflow) {
>>> switch (guestFilter->multicast.mode) {
>>> case VIR_NETDEV_RX_FILTER_MODE_ALL:
>>> if (virNetDevSetRcvAllMulti(ifname, true)) {
>>> -
>>> VIR_WARN("Couldn't set allmulticast flag to 'on' for "
>>> "device %s while responding to "
>>> "NIC_RX_FILTER_CHANGED", ifname);
>>> @@ -4455,17 +4455,29 @@ syncNicRxFilterMultiMode(char *ifname,
>>> virNetDevRxFilterPtr guestFilter,
>>> break;
>>>
>>> case VIR_NETDEV_RX_FILTER_MODE_NORMAL:
>>> - if (virNetDevSetRcvMulti(ifname, true)) {
>>> + if (guestFilter->multicast.overflow &&
>>> + (hostFilter->multicast.mode ==
>>> VIR_NETDEV_RX_FILTER_MODE_ALL)) {
>>> + break;
>>> + }
>>>
>>> + if (virNetDevSetRcvMulti(ifname, true)) {
>
> Ah, please do proper error check: if (func() < 0) { ... }.
>
Ok, I didn't change this call (just moved down). Also, there are other
calls in syncNicRxFilterMultiMode() to virNetDevSetRcvMulti() and
virNetDevSetRcvAllMulti() that just check for non-zero. Should those be
changed as well? If so, I think that should done in a separate patch?
>>> VIR_WARN("Couldn't set multicast flag to 'on' for "
>>> "device %s while responding to "
>>> "NIC_RX_FILTER_CHANGED", ifname);
>>> }
>>>
>>> - if (virNetDevSetRcvAllMulti(ifname, false)) {
>>> - VIR_WARN("Couldn't set allmulticast flag to 'off' for "
>>> - "device %s while responding to "
>>> - "NIC_RX_FILTER_CHANGED", ifname);
>>> + if (guestFilter->multicast.overflow == true) {
>>> + if (virNetDevSetRcvAllMulti(ifname, true)) {
>>> + VIR_WARN("Couldn't set allmulticast flag to 'on'
>>> for "
>>> + "device %s while responding to "
>>> + "NIC_RX_FILTER_CHANGED", ifname);
>>> + }
>>> + } else {
>>> + if (virNetDevSetRcvAllMulti(ifname, false)) {
>>> + VIR_WARN("Couldn't set allmulticast flag to 'off'
>>> for "
>>> + "device %s while responding to "
>>> + "NIC_RX_FILTER_CHANGED", ifname);
>
> I wonder if we can do something like:
>
> if (virNetDevSetRcvAllMulti(ifname,
> guestFilter->multicast.overflow) < 0) {
> VIR_WARN("Couldn't set allmulticast flag to '%s' for "
> "device %s while responding to "
> "NIC_RX_FILTER_CHANGED",
>
> virTristateSwitchTypeToString(virTristateSwitchFromBool(guestFilter->multicast.overflow)),
> ifname);
> }
>
Ok, will fix.
Thanks,
-Jason
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