Patchwork [v5] net: add support of mac-programming over macvtap in QEMU side

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Submitter Amos Kong
Date June 5, 2013, 10:42 a.m.
Message ID <1370428933-15178-1-git-send-email-akong@redhat.com>
Download mbox | patch
Permalink /patch/249000/
State New
Headers show

Comments

Amos Kong - June 5, 2013, 10:42 a.m.
Currently macvtap based macvlan device is working in promiscuous
mode, we want to implement mac-programming over macvtap through
Libvirt for better performance.

Design:
QEMU notifies Libvirt when rx-filter config is changed in guest,
then Libvirt query the rx-filter information by a monitor command,
and sync the change to macvtap device. Related rx-filter config
of the nic contains main mac, rx-mode items and vlan table.

This patch adds a QMP event to notify management of rx-filter change,
and adds a monitor command for management to query rx-filter
information.

For reducing length of output, we just return the entries of vlan
filter table that have active vlan.

Event_throttle API can avoid the events to flood QMP client, but it
could cause an unexpected delay. So a flag for each nic is used to
avoid events flooding, if management doesn't query rx-filter after
it receives one event, new events won't be emitted to QMP monitor.

There maybe exist an uncontrollable delay if we let Libvirt do the
real change, guests normally expect rx-filter updates immediately.
But it's another separate issue, we can investigate it when the
work in Libvirt side is done.

Signed-off-by: Amos Kong <akong@redhat.com>
---
v2: add argument to filter mac-table info of single nic (Stefan)
    update the document, add event notification
v3: rename to rx-filter, add main mac, avoid events flooding (MST)
    fix error process (Stefan), fix qmp interface (Eric)
v4: process qerror in hmp, cleanup (Luiz)
    set flag for each device, add device path in event, add
    helper for g_strdup_printf (MST)
    fix qmp document (Eric)
v5: add path in doc, define notify flag to unsigned (Eric)
    add vlan table (Jason), drop monitor cmd
---
 QMP/qmp-events.txt        |  20 +++++++++
 hw/net/virtio-net.c       | 112 ++++++++++++++++++++++++++++++++++++++++++++++
 include/monitor/monitor.h |   1 +
 include/net/net.h         |   3 ++
 monitor.c                 |   1 +
 net/net.c                 |  47 +++++++++++++++++++
 qapi-schema.json          |  89 ++++++++++++++++++++++++++++++++++++
 qmp-commands.hx           |  66 +++++++++++++++++++++++++++
 8 files changed, 339 insertions(+)
Daniel P. Berrange - June 5, 2013, 10:49 a.m.
On Wed, Jun 05, 2013 at 06:42:13PM +0800, Amos Kong wrote:
> Currently macvtap based macvlan device is working in promiscuous
> mode, we want to implement mac-programming over macvtap through
> Libvirt for better performance.
> 
> Design:
> QEMU notifies Libvirt when rx-filter config is changed in guest,
> then Libvirt query the rx-filter information by a monitor command,
> and sync the change to macvtap device. Related rx-filter config
> of the nic contains main mac, rx-mode items and vlan table.
> 
> This patch adds a QMP event to notify management of rx-filter change,
> and adds a monitor command for management to query rx-filter
> information.
> 
> For reducing length of output, we just return the entries of vlan
> filter table that have active vlan.
> 
> Event_throttle API can avoid the events to flood QMP client, but it
> could cause an unexpected delay. So a flag for each nic is used to
> avoid events flooding, if management doesn't query rx-filter after
> it receives one event, new events won't be emitted to QMP monitor.
> 
> There maybe exist an uncontrollable delay if we let Libvirt do the
> real change, guests normally expect rx-filter updates immediately.
> But it's another separate issue, we can investigate it when the
> work in Libvirt side is done.

What work is libvirt expected to do in response to these events ?
It this just about updating the ebtables rules to allow packets
with the newly configured MAC addr to be sent/received on the
tap backend ?

Daniel
Michael S. Tsirkin - June 5, 2013, 11:02 a.m.
On Wed, Jun 05, 2013 at 11:49:22AM +0100, Daniel P. Berrange wrote:
> On Wed, Jun 05, 2013 at 06:42:13PM +0800, Amos Kong wrote:
> > Currently macvtap based macvlan device is working in promiscuous
> > mode, we want to implement mac-programming over macvtap through
> > Libvirt for better performance.
> > 
> > Design:
> > QEMU notifies Libvirt when rx-filter config is changed in guest,
> > then Libvirt query the rx-filter information by a monitor command,
> > and sync the change to macvtap device. Related rx-filter config
> > of the nic contains main mac, rx-mode items and vlan table.
> > 
> > This patch adds a QMP event to notify management of rx-filter change,
> > and adds a monitor command for management to query rx-filter
> > information.
> > 
> > For reducing length of output, we just return the entries of vlan
> > filter table that have active vlan.
> > 
> > Event_throttle API can avoid the events to flood QMP client, but it
> > could cause an unexpected delay. So a flag for each nic is used to
> > avoid events flooding, if management doesn't query rx-filter after
> > it receives one event, new events won't be emitted to QMP monitor.
> > 
> > There maybe exist an uncontrollable delay if we let Libvirt do the
> > real change, guests normally expect rx-filter updates immediately.
> > But it's another separate issue, we can investigate it when the
> > work in Libvirt side is done.
> 
> What work is libvirt expected to do in response to these events ?
> It this just about updating the ebtables rules to allow packets
> with the newly configured MAC addr to be sent/received on the
> tap backend ?
> 
> Daniel

For tap yes, but it depends on the backend.

For the macvtap backend, it needs to update the macvtap device mac(s)
and rx mode.

It also needs to be policy driven - some admins might want
to prevent the ability to change MAC for (some) guests.

> -- 
> |: http://berrange.com      -o-    http://www.flickr.com/photos/dberrange/ :|
> |: http://libvirt.org              -o-             http://virt-manager.org :|
> |: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
> |: http://entangle-photo.org       -o-       http://live.gnome.org/gtk-vnc :|
Jason Wang - June 6, 2013, 7 a.m.
On 06/05/2013 06:42 PM, Amos Kong wrote:
> Currently macvtap based macvlan device is working in promiscuous
> mode, we want to implement mac-programming over macvtap through
> Libvirt for better performance.
>
> Design:
> QEMU notifies Libvirt when rx-filter config is changed in guest,
> then Libvirt query the rx-filter information by a monitor command,
> and sync the change to macvtap device. Related rx-filter config
> of the nic contains main mac, rx-mode items and vlan table.
>
> This patch adds a QMP event to notify management of rx-filter change,
> and adds a monitor command for management to query rx-filter
> information.
>
> For reducing length of output, we just return the entries of vlan
> filter table that have active vlan.
>
> Event_throttle API can avoid the events to flood QMP client, but it
> could cause an unexpected delay. So a flag for each nic is used to
> avoid events flooding, if management doesn't query rx-filter after
> it receives one event, new events won't be emitted to QMP monitor.
>
> There maybe exist an uncontrollable delay if we let Libvirt do the
> real change, guests normally expect rx-filter updates immediately.
> But it's another separate issue, we can investigate it when the
> work in Libvirt side is done.
>
> Signed-off-by: Amos Kong <akong@redhat.com>
> ---
> v2: add argument to filter mac-table info of single nic (Stefan)
>     update the document, add event notification
> v3: rename to rx-filter, add main mac, avoid events flooding (MST)
>     fix error process (Stefan), fix qmp interface (Eric)
> v4: process qerror in hmp, cleanup (Luiz)
>     set flag for each device, add device path in event, add
>     helper for g_strdup_printf (MST)
>     fix qmp document (Eric)
> v5: add path in doc, define notify flag to unsigned (Eric)
>     add vlan table (Jason), drop monitor cmd
> ---
>  QMP/qmp-events.txt        |  20 +++++++++
>  hw/net/virtio-net.c       | 112 ++++++++++++++++++++++++++++++++++++++++++++++
>  include/monitor/monitor.h |   1 +
>  include/net/net.h         |   3 ++
>  monitor.c                 |   1 +
>  net/net.c                 |  47 +++++++++++++++++++
>  qapi-schema.json          |  89 ++++++++++++++++++++++++++++++++++++
>  qmp-commands.hx           |  66 +++++++++++++++++++++++++++
>  8 files changed, 339 insertions(+)
>
> diff --git a/QMP/qmp-events.txt b/QMP/qmp-events.txt
> index 92fe5fb..885230e 100644
> --- a/QMP/qmp-events.txt
> +++ b/QMP/qmp-events.txt
> @@ -172,6 +172,26 @@ Data:
>    },
>    "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }
>  
> +NIC_RX_FILTER_CHANGED
> +-----------------
> +
> +Emitted when rx-filter configuration of nic is changed by the guest.
> +Each nic has a flag to control event emit, the flag is set to false
> +when it emits one event of the nic, the flag is set to true when
> +management queries the rx-filter of the nic. This is used to avoid
> +events flooding.
> +
> +Data:
> +
> +- "name": net client name (json-string)
> +- "path": device path (json-string)
> +
> +{ "event": "NIC_RX_FILTER_CHANGED",
> +  "data": { "name": "vnet0",
> +            "path": "/machine/peripheral/vnet0/virtio-backend" },
> +  "timestamp": { "seconds": 1368697518, "microseconds": 326866 } }
> +}
> +
>  RESET
>  -----
>  
> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> index 1ea9556..ae1eab6 100644
> --- a/hw/net/virtio-net.c
> +++ b/hw/net/virtio-net.c
> @@ -21,6 +21,8 @@
>  #include "hw/virtio/virtio-net.h"
>  #include "net/vhost_net.h"
>  #include "hw/virtio/virtio-bus.h"
> +#include "qapi/qmp/qjson.h"
> +#include "monitor/monitor.h"
>  
>  #define VIRTIO_NET_VM_VERSION    11
>  
> @@ -192,6 +194,104 @@ static void virtio_net_set_link_status(NetClientState *nc)
>      virtio_net_set_status(vdev, vdev->status);
>  }
>  
> +static void rxfilter_notify(NetClientState *nc)
> +{
> +    QObject *event_data;
> +    VirtIONet *n = qemu_get_nic_opaque(nc);
> +
> +    if (nc->rxfilter_notify_enabled) {
> +        event_data = qobject_from_jsonf("{ 'name': %s, 'path': %s }",
> +                           n->netclient_name,
> +                           object_get_canonical_path(OBJECT(n->qdev)));
> +        monitor_protocol_event(QEVENT_NIC_RX_FILTER_CHANGED, event_data);
> +        qobject_decref(event_data);
> +        /* disable event notification to avoid events flooding */
> +        nc->rxfilter_notify_enabled = 0;
> +    }
> +}
> +
> +static char *mac_strdup_printf(uint8_t *mac)
> +{
> +    return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", mac[0],
> +                            mac[1], mac[2], mac[3], mac[4], mac[5]);
> +}
> +
> +static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc)
> +{
> +    VirtIONet *n = qemu_get_nic_opaque(nc);
> +    RxFilterInfo *info;
> +    strList *str_list = NULL;
> +    strList *entry;
> +    VlanTableEntryList *vlan_list = NULL;
> +    VlanTableEntryList *vlan_entry;
> +    VlanTableEntry *table_entry;
> +    int i;
> +
> +    info = g_malloc0(sizeof(*info));
> +    info->name = g_strdup(nc->name);
> +    info->promiscuous = n->promisc;
> +
> +    if (n->nouni) {
> +        info->unicast = RX_STATE_NONE;
> +    } else if (n->alluni) {
> +        info->unicast = RX_STATE_ALL;
> +    } else {
> +        info->unicast = RX_STATE_NORMAL;
> +    }
> +
> +    if (n->nomulti) {
> +        info->multicast = RX_STATE_NONE;
> +    } else if (n->allmulti) {
> +        info->multicast = RX_STATE_ALL;
> +    } else {
> +        info->multicast = RX_STATE_NORMAL;
> +    }
> +
> +    info->broadcast_allowed = n->nobcast;
> +    info->multicast_overflow = n->mac_table.multi_overflow;
> +    info->unicast_overflow = n->mac_table.uni_overflow;
> +
> +    info->main_mac = mac_strdup_printf(n->mac);
> +
> +    for (i = 0; i < n->mac_table.first_multi; i++) {
> +        entry = g_malloc0(sizeof(*entry));
> +        entry->value = mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
> +        entry->next = str_list;
> +        str_list = entry;
> +    }
> +    info->unicast_table = str_list;
> +
> +    str_list = NULL;
> +    for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
> +        entry = g_malloc0(sizeof(*entry));
> +        entry->value = mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
> +        entry->next = str_list;
> +        str_list = entry;
> +    }
> +    info->multicast_table = str_list;
> +
> +    i = 0;
> +    while (i < MAX_VLAN >> 5) {
> +        /* ignore the entries that have no active vlan */
> +        if (n->vlans[i] == 0) {
> +            i++;
> +            continue;
> +        }
> +        vlan_entry = g_malloc0(sizeof(*vlan_entry));
> +        vlan_entry->value = g_malloc0(sizeof(*table_entry));
> +        vlan_entry->value->index = i;
> +        vlan_entry->value->value = n->vlans[i++];
> +        vlan_entry->next = vlan_list;
> +        vlan_list = vlan_entry;
> +    }
> +    info->vlan_table = vlan_list;
> +
> +    /* enable event notification after query */
> +    nc->rxfilter_notify_enabled = 1;
> +
> +    return info;
> +}
> +
>  static void virtio_net_reset(VirtIODevice *vdev)
>  {
>      VirtIONet *n = VIRTIO_NET(vdev);
> @@ -420,6 +520,7 @@ static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
>  {
>      uint8_t on;
>      size_t s;
> +    NetClientState *nc = qemu_get_queue(n->nic);
>  
>      s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on));
>      if (s != sizeof(on)) {
> @@ -442,6 +543,8 @@ static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
>          return VIRTIO_NET_ERR;
>      }
>  
> +    rxfilter_notify(nc);
> +
>      return VIRTIO_NET_OK;
>  }
>  
> @@ -487,6 +590,7 @@ static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
>  {
>      struct virtio_net_ctrl_mac mac_data;
>      size_t s;
> +    NetClientState *nc = qemu_get_queue(n->nic);
>  
>      if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) {
>          if (iov_size(iov, iov_cnt) != sizeof(n->mac)) {
> @@ -495,6 +599,8 @@ static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
>          s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac));
>          assert(s == sizeof(n->mac));
>          qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
> +        rxfilter_notify(nc);
> +
>          return VIRTIO_NET_OK;
>      }
>  
> @@ -559,6 +665,8 @@ static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
>          n->mac_table.multi_overflow = 1;
>      }
>  
> +    rxfilter_notify(nc);
> +
>      return VIRTIO_NET_OK;
>  }
>  
> @@ -567,6 +675,7 @@ static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
>  {
>      uint16_t vid;
>      size_t s;
> +    NetClientState *nc = qemu_get_queue(n->nic);
>  
>      s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid));
>      vid = lduw_p(&vid);
> @@ -584,6 +693,8 @@ static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
>      else
>          return VIRTIO_NET_ERR;
>  
> +    rxfilter_notify(nc);
> +
>      return VIRTIO_NET_OK;
>  }
>  
> @@ -1312,6 +1423,7 @@ static NetClientInfo net_virtio_info = {
>      .receive = virtio_net_receive,
>          .cleanup = virtio_net_cleanup,
>      .link_status_changed = virtio_net_set_link_status,
> +    .query_rx_filter = virtio_net_query_rxfilter,
>  };
>  
>  static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx)
> diff --git a/include/monitor/monitor.h b/include/monitor/monitor.h
> index 1a6cfcf..1942cc4 100644
> --- a/include/monitor/monitor.h
> +++ b/include/monitor/monitor.h
> @@ -41,6 +41,7 @@ typedef enum MonitorEvent {
>      QEVENT_BLOCK_JOB_READY,
>      QEVENT_DEVICE_DELETED,
>      QEVENT_DEVICE_TRAY_MOVED,
> +    QEVENT_NIC_RX_FILTER_CHANGED,
>      QEVENT_SUSPEND,
>      QEVENT_SUSPEND_DISK,
>      QEVENT_WAKEUP,
> diff --git a/include/net/net.h b/include/net/net.h
> index 43d85a1..30e4b04 100644
> --- a/include/net/net.h
> +++ b/include/net/net.h
> @@ -49,6 +49,7 @@ typedef ssize_t (NetReceiveIOV)(NetClientState *, const struct iovec *, int);
>  typedef void (NetCleanup) (NetClientState *);
>  typedef void (LinkStatusChanged)(NetClientState *);
>  typedef void (NetClientDestructor)(NetClientState *);
> +typedef RxFilterInfo *(QueryRxFilter)(NetClientState *);
>  
>  typedef struct NetClientInfo {
>      NetClientOptionsKind type;
> @@ -59,6 +60,7 @@ typedef struct NetClientInfo {
>      NetCanReceive *can_receive;
>      NetCleanup *cleanup;
>      LinkStatusChanged *link_status_changed;
> +    QueryRxFilter *query_rx_filter;
>      NetPoll *poll;
>  } NetClientInfo;
>  
> @@ -74,6 +76,7 @@ struct NetClientState {
>      unsigned receive_disabled : 1;
>      NetClientDestructor *destructor;
>      unsigned int queue_index;
> +    unsigned rxfilter_notify_enabled:1;
>  };
>  
>  typedef struct NICState {
> diff --git a/monitor.c b/monitor.c
> index 6ce2a4e..5e64fe8 100644
> --- a/monitor.c
> +++ b/monitor.c
> @@ -490,6 +490,7 @@ static const char *monitor_event_names[] = {
>      [QEVENT_BLOCK_JOB_READY] = "BLOCK_JOB_READY",
>      [QEVENT_DEVICE_DELETED] = "DEVICE_DELETED",
>      [QEVENT_DEVICE_TRAY_MOVED] = "DEVICE_TRAY_MOVED",
> +    [QEVENT_NIC_RX_FILTER_CHANGED] = "NIC_RX_FILTER_CHANGED",
>      [QEVENT_SUSPEND] = "SUSPEND",
>      [QEVENT_SUSPEND_DISK] = "SUSPEND_DISK",
>      [QEVENT_WAKEUP] = "WAKEUP",
> diff --git a/net/net.c b/net/net.c
> index 43a74e4..33abffe 100644
> --- a/net/net.c
> +++ b/net/net.c
> @@ -961,6 +961,53 @@ void print_net_client(Monitor *mon, NetClientState *nc)
>                     nc->info_str);
>  }
>  
> +RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
> +                                      Error **errp)
> +{
> +    NetClientState *nc;
> +    RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
> +
> +    QTAILQ_FOREACH(nc, &net_clients, next) {
> +        RxFilterInfoList *entry;
> +        RxFilterInfo *info;
> +
> +        /* only query rx-filter information of nic */
> +        if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) {
> +            continue;
> +        }
> +        if (has_name && strcmp(nc->name, name) != 0) {
> +            continue;
> +        }
> +
> +        if (nc->info->query_rx_filter) {
> +            info = nc->info->query_rx_filter(nc);
> +            entry = g_malloc0(sizeof(*entry));
> +            entry->value = info;
> +
> +            if (!filter_list) {
> +                filter_list = entry;
> +            } else {
> +                last_entry->next = entry;
> +            }
> +            last_entry = entry;
> +        } else if (has_name) {
> +            error_setg(errp, "net client(%s) doesn't support"
> +                       " rx-filter querying", name);
> +            break;
> +        }
> +    }
> +
> +    if (filter_list == NULL && !error_is_set(errp)) {
> +        if (has_name) {
> +            error_setg(errp, "invalid net client name: %s", name);
> +        } else {
> +            error_setg(errp, "no net client supports rx-filter querying");
> +        }
> +    }
> +
> +    return filter_list;
> +}
> +
>  void do_info_network(Monitor *mon, const QDict *qdict)
>  {
>      NetClientState *nc, *peer;
> diff --git a/qapi-schema.json b/qapi-schema.json
> index ef1f657..fb6f12c 100644
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
> @@ -3618,3 +3618,92 @@
>              '*cpuid-input-ecx': 'int',
>              'cpuid-register': 'X86CPURegister32',
>              'features': 'int' } }
> +
> +##
> +# @RxState:
> +#
> +# Packets receiving state
> +#
> +# @normal: filter assigned packets according to the mac-table
> +#
> +# @none: don't receive any assigned packet
> +#
> +# @all: receive all assigned packets
> +#
> +##
> +{ 'enum': 'RxState', 'data': [ 'normal', 'none', 'all' ] }
> +
> +##
> +# @VlanTableEntry
> +#
> +# Entry detail of vlan filter table
> +#
> +# @index: index of vlan filter table
> +#
> +# @value: 32 bit of indicator for active vlans
> +#
> +# Since 1.6
> +##
> +
> +{ 'type': 'VlanTableEntry', 'data': { 'index': 'int', 'value': 'uint32' } }
> +
> +##
> +# @RxFilterInfo:
> +#
> +# Rx-filter information for a nic.
> +#
> +# @name: net client name
> +#
> +# @promiscuous: whether promiscuous mode is enabled
> +#
> +# @multicast: multicast receive state
> +#
> +# @unicast: unicast receive state
> +#
> +# @broadcast-allowed: whether to receive broadcast
> +#
> +# @multicast-overflow: multicast table is overflowed or not
> +#
> +# @unicast-overflow: unicast table is overflowed or not
> +#
> +# @main-mac: the main macaddr string
> +#
> +# @vlan-table: a list of @VlanTableEntry
> +#
> +# @unicast-table: a list of unicast macaddr string
> +#
> +# @multicast-table: a list of multicast macaddr string
> +#
> +# Since 1.6
> +##
> +
> +{ 'type': 'RxFilterInfo',
> +  'data': {
> +    'name':               'str',
> +    'promiscuous':        'bool',
> +    'multicast':          'RxState',
> +    'unicast':            'RxState',
> +    'broadcast-allowed':  'bool',
> +    'multicast-overflow': 'bool',
> +    'unicast-overflow':   'bool',
> +    'main-mac':           'str',
> +    'vlan-table':         ['VlanTableEntry'],
> +    'unicast-table':      ['str'],
> +    'multicast-table':    ['str'] }}
> +
> +##
> +# @query-rx-filter:
> +#
> +# Return rx-filter information for all nics (or for the given nic).
> +#
> +# @name: #optional net client name
> +#
> +# Returns: list of @RxFilterInfo for all nics (or for the given nic).
> +#          Returns an error if the given @name doesn't exist, or given
> +#          nic doesn't support rx-filter querying, or no net client
> +#          supports rx-filter querying
> +#
> +# Since: 1.6
> +##
> +{ 'command': 'query-rx-filter', 'data': { '*name': 'str' },
> +  'returns': ['RxFilterInfo'] }
> diff --git a/qmp-commands.hx b/qmp-commands.hx
> index ffd130e..e76e9a2 100644
> --- a/qmp-commands.hx
> +++ b/qmp-commands.hx
> @@ -2932,3 +2932,69 @@ Example:
>  <- { "return": {} }
>  
>  EQMP
> +    {
> +        .name       = "query-rx-filter",
> +        .args_type  = "name:s?",
> +        .mhandler.cmd_new = qmp_marshal_input_query_rx_filter,
> +    },
> +
> +SQMP
> +query-rx-filter
> +---------------
> +
> +Show rx-filter information.
> +
> +Returns a json-array of rx-filter information for all nics (or for the
> +given nic), returning an error if the given nic doesn't exist, or
> +given nic doesn't support rx-filter querying, or no net client
> +supports rx-filter querying.
> +
> +The query will clear the event notification flag of each nic, then qemu
> +will start to emit event to QMP monitor.
> +
> +Each array entry contains the following:
> +
> +- "name": net client name (json-string)
> +- "promiscuous": promiscuous mode is enabled (json-bool)
> +- "multicast": multicast receive state (one of 'normal', 'none', 'all')
> +- "unicast": unicast receive state  (one of 'normal', 'none', 'all')
> +- "broadcast-allowed": allow to receive broadcast (json-bool)
> +- "multicast-overflow": multicast table is overflowed (json-bool)
> +- "unicast-overflow": unicast table is overflowed (json-bool)
> +- "main-mac": main macaddr string (json-string)
> +- "vlan-table": a json-array of vlan-table entry
> +    - "index": index of vlan filter table (json-int)
> +    - "value": 32 bit of indicator for active vlans

Not sure whether or not this is libvirt friendly. Looks like you expect
libvirt to do some post-processing. Why not just expose vids?
> +- "unicast-table": a json-array of unicast macaddr string
> +- "multicast-table": a json-array of multicast macaddr string
> +
> +Example:
> +
> +-> { "execute": "query-rx-filter", "arguments": { "name": "vnet0" } }
> +<- { "return": [
> +        {
> +            "promiscuous": true,
> +            "name": "vnet0",
> +            "main-mac": "52:54:00:12:34:56",
> +            "unicast": "normal",
> +            "vlan-table": [
> +                { "index": 0,
> +                  "entry": 1
> +                }
> +            ],
> +            "unicast-table": [
> +            ],
> +            "multicast": "normal",
> +            "multicast-overflow": false,
> +            "unicast-overflow": false,
> +            "multicast-table": [
> +                "01:00:5e:00:00:01",
> +                "33:33:00:00:00:01",
> +                "33:33:ff:12:34:56"
> +            ],
> +            "broadcast-allowed": false
> +        }
> +      ]
> +   }
> +
> +EQMP
Luiz Capitulino - June 7, 2013, 1:46 p.m.
On Wed,  5 Jun 2013 18:42:13 +0800
Amos Kong <akong@redhat.com> wrote:

> Currently macvtap based macvlan device is working in promiscuous
> mode, we want to implement mac-programming over macvtap through
> Libvirt for better performance.
> 
> Design:
> QEMU notifies Libvirt when rx-filter config is changed in guest,
> then Libvirt query the rx-filter information by a monitor command,
> and sync the change to macvtap device. Related rx-filter config
> of the nic contains main mac, rx-mode items and vlan table.
> 
> This patch adds a QMP event to notify management of rx-filter change,
> and adds a monitor command for management to query rx-filter
> information.
> 
> For reducing length of output, we just return the entries of vlan
> filter table that have active vlan.
> 
> Event_throttle API can avoid the events to flood QMP client, but it
> could cause an unexpected delay. So a flag for each nic is used to
> avoid events flooding, if management doesn't query rx-filter after
> it receives one event, new events won't be emitted to QMP monitor.
> 
> There maybe exist an uncontrollable delay if we let Libvirt do the
> real change, guests normally expect rx-filter updates immediately.
> But it's another separate issue, we can investigate it when the
> work in Libvirt side is done.

I think I completely misunderstood your testing results.

I had understood that: 1. changing the mac often & quick enough to
be a problem was a corner case and 2. you actually can overflow mngt

I hope I really got it wrong, otherwise you'll be using that
flag as a replacement for the event throttle API, which would be
a big mistake.

Can you please add your test results & analysis to this commit message?

Two small comments below.

> Signed-off-by: Amos Kong <akong@redhat.com>
> ---
> v2: add argument to filter mac-table info of single nic (Stefan)
>     update the document, add event notification
> v3: rename to rx-filter, add main mac, avoid events flooding (MST)
>     fix error process (Stefan), fix qmp interface (Eric)
> v4: process qerror in hmp, cleanup (Luiz)
>     set flag for each device, add device path in event, add
>     helper for g_strdup_printf (MST)
>     fix qmp document (Eric)
> v5: add path in doc, define notify flag to unsigned (Eric)
>     add vlan table (Jason), drop monitor cmd
> ---
>  QMP/qmp-events.txt        |  20 +++++++++
>  hw/net/virtio-net.c       | 112 ++++++++++++++++++++++++++++++++++++++++++++++
>  include/monitor/monitor.h |   1 +
>  include/net/net.h         |   3 ++
>  monitor.c                 |   1 +
>  net/net.c                 |  47 +++++++++++++++++++
>  qapi-schema.json          |  89 ++++++++++++++++++++++++++++++++++++
>  qmp-commands.hx           |  66 +++++++++++++++++++++++++++
>  8 files changed, 339 insertions(+)
> 
> diff --git a/QMP/qmp-events.txt b/QMP/qmp-events.txt
> index 92fe5fb..885230e 100644
> --- a/QMP/qmp-events.txt
> +++ b/QMP/qmp-events.txt
> @@ -172,6 +172,26 @@ Data:
>    },
>    "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }
>  
> +NIC_RX_FILTER_CHANGED
> +-----------------
> +
> +Emitted when rx-filter configuration of nic is changed by the guest.
> +Each nic has a flag to control event emit, the flag is set to false
> +when it emits one event of the nic, the flag is set to true when
> +management queries the rx-filter of the nic. This is used to avoid
> +events flooding.

Having this flag is an implementation detail. I think you should only
say that the event is emitted once until the query command is executed.

> +
> +Data:
> +
> +- "name": net client name (json-string)
> +- "path": device path (json-string)
> +
> +{ "event": "NIC_RX_FILTER_CHANGED",
> +  "data": { "name": "vnet0",
> +            "path": "/machine/peripheral/vnet0/virtio-backend" },
> +  "timestamp": { "seconds": 1368697518, "microseconds": 326866 } }
> +}
> +
>  RESET
>  -----
>  
> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> index 1ea9556..ae1eab6 100644
> --- a/hw/net/virtio-net.c
> +++ b/hw/net/virtio-net.c
> @@ -21,6 +21,8 @@
>  #include "hw/virtio/virtio-net.h"
>  #include "net/vhost_net.h"
>  #include "hw/virtio/virtio-bus.h"
> +#include "qapi/qmp/qjson.h"
> +#include "monitor/monitor.h"
>  
>  #define VIRTIO_NET_VM_VERSION    11
>  
> @@ -192,6 +194,104 @@ static void virtio_net_set_link_status(NetClientState *nc)
>      virtio_net_set_status(vdev, vdev->status);
>  }
>  
> +static void rxfilter_notify(NetClientState *nc)
> +{
> +    QObject *event_data;
> +    VirtIONet *n = qemu_get_nic_opaque(nc);
> +
> +    if (nc->rxfilter_notify_enabled) {
> +        event_data = qobject_from_jsonf("{ 'name': %s, 'path': %s }",
> +                           n->netclient_name,
> +                           object_get_canonical_path(OBJECT(n->qdev)));
> +        monitor_protocol_event(QEVENT_NIC_RX_FILTER_CHANGED, event_data);
> +        qobject_decref(event_data);
> +        /* disable event notification to avoid events flooding */
> +        nc->rxfilter_notify_enabled = 0;
> +    }
> +}
> +
> +static char *mac_strdup_printf(uint8_t *mac)
> +{

mac can be const. Is there more code in QEMU that could use this
function? If there's, then it's better to move this function to a
more generic .c file.

> +    return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", mac[0],
> +                            mac[1], mac[2], mac[3], mac[4], mac[5]);
> +}
> +
> +static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc)
> +{
> +    VirtIONet *n = qemu_get_nic_opaque(nc);
> +    RxFilterInfo *info;
> +    strList *str_list = NULL;
> +    strList *entry;
> +    VlanTableEntryList *vlan_list = NULL;
> +    VlanTableEntryList *vlan_entry;
> +    VlanTableEntry *table_entry;
> +    int i;
> +
> +    info = g_malloc0(sizeof(*info));
> +    info->name = g_strdup(nc->name);
> +    info->promiscuous = n->promisc;
> +
> +    if (n->nouni) {
> +        info->unicast = RX_STATE_NONE;
> +    } else if (n->alluni) {
> +        info->unicast = RX_STATE_ALL;
> +    } else {
> +        info->unicast = RX_STATE_NORMAL;
> +    }
> +
> +    if (n->nomulti) {
> +        info->multicast = RX_STATE_NONE;
> +    } else if (n->allmulti) {
> +        info->multicast = RX_STATE_ALL;
> +    } else {
> +        info->multicast = RX_STATE_NORMAL;
> +    }
> +
> +    info->broadcast_allowed = n->nobcast;
> +    info->multicast_overflow = n->mac_table.multi_overflow;
> +    info->unicast_overflow = n->mac_table.uni_overflow;
> +
> +    info->main_mac = mac_strdup_printf(n->mac);
> +
> +    for (i = 0; i < n->mac_table.first_multi; i++) {
> +        entry = g_malloc0(sizeof(*entry));
> +        entry->value = mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
> +        entry->next = str_list;
> +        str_list = entry;
> +    }
> +    info->unicast_table = str_list;
> +
> +    str_list = NULL;
> +    for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
> +        entry = g_malloc0(sizeof(*entry));
> +        entry->value = mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
> +        entry->next = str_list;
> +        str_list = entry;
> +    }
> +    info->multicast_table = str_list;
> +
> +    i = 0;
> +    while (i < MAX_VLAN >> 5) {
> +        /* ignore the entries that have no active vlan */
> +        if (n->vlans[i] == 0) {
> +            i++;
> +            continue;
> +        }
> +        vlan_entry = g_malloc0(sizeof(*vlan_entry));
> +        vlan_entry->value = g_malloc0(sizeof(*table_entry));
> +        vlan_entry->value->index = i;
> +        vlan_entry->value->value = n->vlans[i++];
> +        vlan_entry->next = vlan_list;
> +        vlan_list = vlan_entry;
> +    }
> +    info->vlan_table = vlan_list;
> +
> +    /* enable event notification after query */
> +    nc->rxfilter_notify_enabled = 1;
> +
> +    return info;
> +}
> +
>  static void virtio_net_reset(VirtIODevice *vdev)
>  {
>      VirtIONet *n = VIRTIO_NET(vdev);
> @@ -420,6 +520,7 @@ static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
>  {
>      uint8_t on;
>      size_t s;
> +    NetClientState *nc = qemu_get_queue(n->nic);
>  
>      s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on));
>      if (s != sizeof(on)) {
> @@ -442,6 +543,8 @@ static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
>          return VIRTIO_NET_ERR;
>      }
>  
> +    rxfilter_notify(nc);
> +
>      return VIRTIO_NET_OK;
>  }
>  
> @@ -487,6 +590,7 @@ static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
>  {
>      struct virtio_net_ctrl_mac mac_data;
>      size_t s;
> +    NetClientState *nc = qemu_get_queue(n->nic);
>  
>      if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) {
>          if (iov_size(iov, iov_cnt) != sizeof(n->mac)) {
> @@ -495,6 +599,8 @@ static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
>          s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac));
>          assert(s == sizeof(n->mac));
>          qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
> +        rxfilter_notify(nc);
> +
>          return VIRTIO_NET_OK;
>      }
>  
> @@ -559,6 +665,8 @@ static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
>          n->mac_table.multi_overflow = 1;
>      }
>  
> +    rxfilter_notify(nc);
> +
>      return VIRTIO_NET_OK;
>  }
>  
> @@ -567,6 +675,7 @@ static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
>  {
>      uint16_t vid;
>      size_t s;
> +    NetClientState *nc = qemu_get_queue(n->nic);
>  
>      s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid));
>      vid = lduw_p(&vid);
> @@ -584,6 +693,8 @@ static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
>      else
>          return VIRTIO_NET_ERR;
>  
> +    rxfilter_notify(nc);
> +
>      return VIRTIO_NET_OK;
>  }
>  
> @@ -1312,6 +1423,7 @@ static NetClientInfo net_virtio_info = {
>      .receive = virtio_net_receive,
>          .cleanup = virtio_net_cleanup,
>      .link_status_changed = virtio_net_set_link_status,
> +    .query_rx_filter = virtio_net_query_rxfilter,
>  };
>  
>  static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx)
> diff --git a/include/monitor/monitor.h b/include/monitor/monitor.h
> index 1a6cfcf..1942cc4 100644
> --- a/include/monitor/monitor.h
> +++ b/include/monitor/monitor.h
> @@ -41,6 +41,7 @@ typedef enum MonitorEvent {
>      QEVENT_BLOCK_JOB_READY,
>      QEVENT_DEVICE_DELETED,
>      QEVENT_DEVICE_TRAY_MOVED,
> +    QEVENT_NIC_RX_FILTER_CHANGED,
>      QEVENT_SUSPEND,
>      QEVENT_SUSPEND_DISK,
>      QEVENT_WAKEUP,
> diff --git a/include/net/net.h b/include/net/net.h
> index 43d85a1..30e4b04 100644
> --- a/include/net/net.h
> +++ b/include/net/net.h
> @@ -49,6 +49,7 @@ typedef ssize_t (NetReceiveIOV)(NetClientState *, const struct iovec *, int);
>  typedef void (NetCleanup) (NetClientState *);
>  typedef void (LinkStatusChanged)(NetClientState *);
>  typedef void (NetClientDestructor)(NetClientState *);
> +typedef RxFilterInfo *(QueryRxFilter)(NetClientState *);
>  
>  typedef struct NetClientInfo {
>      NetClientOptionsKind type;
> @@ -59,6 +60,7 @@ typedef struct NetClientInfo {
>      NetCanReceive *can_receive;
>      NetCleanup *cleanup;
>      LinkStatusChanged *link_status_changed;
> +    QueryRxFilter *query_rx_filter;
>      NetPoll *poll;
>  } NetClientInfo;
>  
> @@ -74,6 +76,7 @@ struct NetClientState {
>      unsigned receive_disabled : 1;
>      NetClientDestructor *destructor;
>      unsigned int queue_index;
> +    unsigned rxfilter_notify_enabled:1;
>  };
>  
>  typedef struct NICState {
> diff --git a/monitor.c b/monitor.c
> index 6ce2a4e..5e64fe8 100644
> --- a/monitor.c
> +++ b/monitor.c
> @@ -490,6 +490,7 @@ static const char *monitor_event_names[] = {
>      [QEVENT_BLOCK_JOB_READY] = "BLOCK_JOB_READY",
>      [QEVENT_DEVICE_DELETED] = "DEVICE_DELETED",
>      [QEVENT_DEVICE_TRAY_MOVED] = "DEVICE_TRAY_MOVED",
> +    [QEVENT_NIC_RX_FILTER_CHANGED] = "NIC_RX_FILTER_CHANGED",
>      [QEVENT_SUSPEND] = "SUSPEND",
>      [QEVENT_SUSPEND_DISK] = "SUSPEND_DISK",
>      [QEVENT_WAKEUP] = "WAKEUP",
> diff --git a/net/net.c b/net/net.c
> index 43a74e4..33abffe 100644
> --- a/net/net.c
> +++ b/net/net.c
> @@ -961,6 +961,53 @@ void print_net_client(Monitor *mon, NetClientState *nc)
>                     nc->info_str);
>  }
>  
> +RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
> +                                      Error **errp)
> +{
> +    NetClientState *nc;
> +    RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
> +
> +    QTAILQ_FOREACH(nc, &net_clients, next) {
> +        RxFilterInfoList *entry;
> +        RxFilterInfo *info;
> +
> +        /* only query rx-filter information of nic */
> +        if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) {
> +            continue;
> +        }
> +        if (has_name && strcmp(nc->name, name) != 0) {
> +            continue;
> +        }
> +
> +        if (nc->info->query_rx_filter) {
> +            info = nc->info->query_rx_filter(nc);
> +            entry = g_malloc0(sizeof(*entry));
> +            entry->value = info;
> +
> +            if (!filter_list) {
> +                filter_list = entry;
> +            } else {
> +                last_entry->next = entry;
> +            }
> +            last_entry = entry;
> +        } else if (has_name) {
> +            error_setg(errp, "net client(%s) doesn't support"
> +                       " rx-filter querying", name);
> +            break;
> +        }
> +    }
> +
> +    if (filter_list == NULL && !error_is_set(errp)) {
> +        if (has_name) {
> +            error_setg(errp, "invalid net client name: %s", name);
> +        } else {
> +            error_setg(errp, "no net client supports rx-filter querying");
> +        }
> +    }
> +
> +    return filter_list;
> +}
> +
>  void do_info_network(Monitor *mon, const QDict *qdict)
>  {
>      NetClientState *nc, *peer;
> diff --git a/qapi-schema.json b/qapi-schema.json
> index ef1f657..fb6f12c 100644
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
> @@ -3618,3 +3618,92 @@
>              '*cpuid-input-ecx': 'int',
>              'cpuid-register': 'X86CPURegister32',
>              'features': 'int' } }
> +
> +##
> +# @RxState:
> +#
> +# Packets receiving state
> +#
> +# @normal: filter assigned packets according to the mac-table
> +#
> +# @none: don't receive any assigned packet
> +#
> +# @all: receive all assigned packets
> +#
> +##
> +{ 'enum': 'RxState', 'data': [ 'normal', 'none', 'all' ] }
> +
> +##
> +# @VlanTableEntry
> +#
> +# Entry detail of vlan filter table
> +#
> +# @index: index of vlan filter table
> +#
> +# @value: 32 bit of indicator for active vlans
> +#
> +# Since 1.6
> +##
> +
> +{ 'type': 'VlanTableEntry', 'data': { 'index': 'int', 'value': 'uint32' } }
> +
> +##
> +# @RxFilterInfo:
> +#
> +# Rx-filter information for a nic.
> +#
> +# @name: net client name
> +#
> +# @promiscuous: whether promiscuous mode is enabled
> +#
> +# @multicast: multicast receive state
> +#
> +# @unicast: unicast receive state
> +#
> +# @broadcast-allowed: whether to receive broadcast
> +#
> +# @multicast-overflow: multicast table is overflowed or not
> +#
> +# @unicast-overflow: unicast table is overflowed or not
> +#
> +# @main-mac: the main macaddr string
> +#
> +# @vlan-table: a list of @VlanTableEntry
> +#
> +# @unicast-table: a list of unicast macaddr string
> +#
> +# @multicast-table: a list of multicast macaddr string
> +#
> +# Since 1.6
> +##
> +
> +{ 'type': 'RxFilterInfo',
> +  'data': {
> +    'name':               'str',
> +    'promiscuous':        'bool',
> +    'multicast':          'RxState',
> +    'unicast':            'RxState',
> +    'broadcast-allowed':  'bool',
> +    'multicast-overflow': 'bool',
> +    'unicast-overflow':   'bool',
> +    'main-mac':           'str',
> +    'vlan-table':         ['VlanTableEntry'],
> +    'unicast-table':      ['str'],
> +    'multicast-table':    ['str'] }}
> +
> +##
> +# @query-rx-filter:
> +#
> +# Return rx-filter information for all nics (or for the given nic).
> +#
> +# @name: #optional net client name
> +#
> +# Returns: list of @RxFilterInfo for all nics (or for the given nic).
> +#          Returns an error if the given @name doesn't exist, or given
> +#          nic doesn't support rx-filter querying, or no net client
> +#          supports rx-filter querying
> +#
> +# Since: 1.6
> +##
> +{ 'command': 'query-rx-filter', 'data': { '*name': 'str' },
> +  'returns': ['RxFilterInfo'] }
> diff --git a/qmp-commands.hx b/qmp-commands.hx
> index ffd130e..e76e9a2 100644
> --- a/qmp-commands.hx
> +++ b/qmp-commands.hx
> @@ -2932,3 +2932,69 @@ Example:
>  <- { "return": {} }
>  
>  EQMP
> +    {
> +        .name       = "query-rx-filter",
> +        .args_type  = "name:s?",
> +        .mhandler.cmd_new = qmp_marshal_input_query_rx_filter,
> +    },
> +
> +SQMP
> +query-rx-filter
> +---------------
> +
> +Show rx-filter information.
> +
> +Returns a json-array of rx-filter information for all nics (or for the
> +given nic), returning an error if the given nic doesn't exist, or
> +given nic doesn't support rx-filter querying, or no net client
> +supports rx-filter querying.
> +
> +The query will clear the event notification flag of each nic, then qemu
> +will start to emit event to QMP monitor.
> +
> +Each array entry contains the following:
> +
> +- "name": net client name (json-string)
> +- "promiscuous": promiscuous mode is enabled (json-bool)
> +- "multicast": multicast receive state (one of 'normal', 'none', 'all')
> +- "unicast": unicast receive state  (one of 'normal', 'none', 'all')
> +- "broadcast-allowed": allow to receive broadcast (json-bool)
> +- "multicast-overflow": multicast table is overflowed (json-bool)
> +- "unicast-overflow": unicast table is overflowed (json-bool)
> +- "main-mac": main macaddr string (json-string)
> +- "vlan-table": a json-array of vlan-table entry
> +    - "index": index of vlan filter table (json-int)
> +    - "value": 32 bit of indicator for active vlans
> +- "unicast-table": a json-array of unicast macaddr string
> +- "multicast-table": a json-array of multicast macaddr string
> +
> +Example:
> +
> +-> { "execute": "query-rx-filter", "arguments": { "name": "vnet0" } }
> +<- { "return": [
> +        {
> +            "promiscuous": true,
> +            "name": "vnet0",
> +            "main-mac": "52:54:00:12:34:56",
> +            "unicast": "normal",
> +            "vlan-table": [
> +                { "index": 0,
> +                  "entry": 1
> +                }
> +            ],
> +            "unicast-table": [
> +            ],
> +            "multicast": "normal",
> +            "multicast-overflow": false,
> +            "unicast-overflow": false,
> +            "multicast-table": [
> +                "01:00:5e:00:00:01",
> +                "33:33:00:00:00:01",
> +                "33:33:ff:12:34:56"
> +            ],
> +            "broadcast-allowed": false
> +        }
> +      ]
> +   }
> +
> +EQMP
Amos Kong - June 14, 2013, 5:55 a.m.
On Thu, Jun 06, 2013 at 03:00:34PM +0800, Jason Wang wrote:
> On 06/05/2013 06:42 PM, Amos Kong wrote:
> > Currently macvtap based macvlan device is working in promiscuous
> > mode, we want to implement mac-programming over macvtap through
> > Libvirt for better performance.

...
> > +SQMP
> > +query-rx-filter
> > +---------------
> > +
> > +Show rx-filter information.
> > +
> > +Returns a json-array of rx-filter information for all nics (or for the
> > +given nic), returning an error if the given nic doesn't exist, or
> > +given nic doesn't support rx-filter querying, or no net client
> > +supports rx-filter querying.
> > +
> > +The query will clear the event notification flag of each nic, then qemu
> > +will start to emit event to QMP monitor.
> > +
> > +Each array entry contains the following:
> > +
> > +- "name": net client name (json-string)
> > +- "promiscuous": promiscuous mode is enabled (json-bool)
> > +- "multicast": multicast receive state (one of 'normal', 'none', 'all')
> > +- "unicast": unicast receive state  (one of 'normal', 'none', 'all')
> > +- "broadcast-allowed": allow to receive broadcast (json-bool)
> > +- "multicast-overflow": multicast table is overflowed (json-bool)
> > +- "unicast-overflow": unicast table is overflowed (json-bool)
> > +- "main-mac": main macaddr string (json-string)
> > +- "vlan-table": a json-array of vlan-table entry
> > +    - "index": index of vlan filter table (json-int)
> > +    - "value": 32 bit of indicator for active vlans
> 
> Not sure whether or not this is libvirt friendly. Looks like you expect
> libvirt to do some post-processing. Why not just expose vids?

vid is used in userspace, I will return vid json-array in output.
Thanks.

> > +- "unicast-table": a json-array of unicast macaddr string
> > +- "multicast-table": a json-array of multicast macaddr string
> > +
Amos Kong - June 14, 2013, 6:05 a.m.
On Fri, Jun 07, 2013 at 09:46:12AM -0400, Luiz Capitulino wrote:
> On Wed,  5 Jun 2013 18:42:13 +0800
> Amos Kong <akong@redhat.com> wrote:
> 
> > Currently macvtap based macvlan device is working in promiscuous
> > mode, we want to implement mac-programming over macvtap through
> > Libvirt for better performance.
> > 
> > Design:
> > QEMU notifies Libvirt when rx-filter config is changed in guest,
> > then Libvirt query the rx-filter information by a monitor command,
> > and sync the change to macvtap device. Related rx-filter config
> > of the nic contains main mac, rx-mode items and vlan table.
> > 
> > This patch adds a QMP event to notify management of rx-filter change,
> > and adds a monitor command for management to query rx-filter
> > information.
> > 
> > For reducing length of output, we just return the entries of vlan
> > filter table that have active vlan.
> > 
> > Event_throttle API can avoid the events to flood QMP client, but it
> > could cause an unexpected delay. So a flag for each nic is used to
> > avoid events flooding, if management doesn't query rx-filter after
> > it receives one event, new events won't be emitted to QMP monitor.
> > 
> > There maybe exist an uncontrollable delay if we let Libvirt do the
> > real change, guests normally expect rx-filter updates immediately.
> > But it's another separate issue, we can investigate it when the
> > work in Libvirt side is done.
> 
> I think I completely misunderstood your testing results.
> 
> I had understood that: 1. changing the mac often & quick enough to
> be a problem was a corner case and 2. you actually can overflow mngt
> 
> I hope I really got it wrong, otherwise you'll be using that
> flag as a replacement for the event throttle API, which would be
> a big mistake.

It's not replacement, the flag could not cause delay.
 
> Can you please add your test results & analysis to this commit message?

OK.
 
> Two small comments below.
> 
> > Signed-off-by: Amos Kong <akong@redhat.com>
> > ---
> > v2: add argument to filter mac-table info of single nic (Stefan)
> >     update the document, add event notification
> > v3: rename to rx-filter, add main mac, avoid events flooding (MST)
> >     fix error process (Stefan), fix qmp interface (Eric)
> > v4: process qerror in hmp, cleanup (Luiz)
> >     set flag for each device, add device path in event, add
> >     helper for g_strdup_printf (MST)
> >     fix qmp document (Eric)
> > v5: add path in doc, define notify flag to unsigned (Eric)
> >     add vlan table (Jason), drop monitor cmd
> > ---
> >  QMP/qmp-events.txt        |  20 +++++++++
> >  hw/net/virtio-net.c       | 112 ++++++++++++++++++++++++++++++++++++++++++++++
> >  include/monitor/monitor.h |   1 +
> >  include/net/net.h         |   3 ++
> >  monitor.c                 |   1 +
> >  net/net.c                 |  47 +++++++++++++++++++
> >  qapi-schema.json          |  89 ++++++++++++++++++++++++++++++++++++
> >  qmp-commands.hx           |  66 +++++++++++++++++++++++++++
> >  8 files changed, 339 insertions(+)
> > 
> > diff --git a/QMP/qmp-events.txt b/QMP/qmp-events.txt
> > index 92fe5fb..885230e 100644
> > --- a/QMP/qmp-events.txt
> > +++ b/QMP/qmp-events.txt
> > @@ -172,6 +172,26 @@ Data:
> >    },
> >    "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }
> >  
> > +NIC_RX_FILTER_CHANGED
> > +-----------------
> > +
> > +Emitted when rx-filter configuration of nic is changed by the guest.
> > +Each nic has a flag to control event emit, the flag is set to false
> > +when it emits one event of the nic, the flag is set to true when
> > +management queries the rx-filter of the nic. This is used to avoid
> > +events flooding.
> 
> Having this flag is an implementation detail. I think you should only
> say that the event is emitted once until the query command is executed.

OK.

> > +
> > +Data:
> > +
> > +- "name": net client name (json-string)
> > +- "path": device path (json-string)
> > +
> > +{ "event": "NIC_RX_FILTER_CHANGED",
> > +  "data": { "name": "vnet0",
> > +            "path": "/machine/peripheral/vnet0/virtio-backend" },
> > +  "timestamp": { "seconds": 1368697518, "microseconds": 326866 } }
> > +}
> > +
> >  RESET
> >  -----
> >  
> > diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> > index 1ea9556..ae1eab6 100644
> > --- a/hw/net/virtio-net.c
> > +++ b/hw/net/virtio-net.c
> > @@ -21,6 +21,8 @@
> >  #include "hw/virtio/virtio-net.h"
> >  #include "net/vhost_net.h"
> >  #include "hw/virtio/virtio-bus.h"
> > +#include "qapi/qmp/qjson.h"
> > +#include "monitor/monitor.h"
> >  
> >  #define VIRTIO_NET_VM_VERSION    11
> >  
> > @@ -192,6 +194,104 @@ static void virtio_net_set_link_status(NetClientState *nc)
> >      virtio_net_set_status(vdev, vdev->status);
> >  }
> >  
> > +static void rxfilter_notify(NetClientState *nc)
> > +{
> > +    QObject *event_data;
> > +    VirtIONet *n = qemu_get_nic_opaque(nc);
> > +
> > +    if (nc->rxfilter_notify_enabled) {
> > +        event_data = qobject_from_jsonf("{ 'name': %s, 'path': %s }",
> > +                           n->netclient_name,
> > +                           object_get_canonical_path(OBJECT(n->qdev)));
> > +        monitor_protocol_event(QEVENT_NIC_RX_FILTER_CHANGED, event_data);
> > +        qobject_decref(event_data);
> > +        /* disable event notification to avoid events flooding */
> > +        nc->rxfilter_notify_enabled = 0;
> > +    }
> > +}
> > +
> > +static char *mac_strdup_printf(uint8_t *mac)

     static char *mac_strdup_printf(const uint8_t *mac)

> > +{
> 
> mac can be const. Is there more code in QEMU that could use this
> function? 

No.

> If there's, then it's better to move this function to a
> more generic .c file.
 
> > +    return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", mac[0],
> > +                            mac[1], mac[2], mac[3], mac[4], mac[5]);
> > +}
> > +

Patch

diff --git a/QMP/qmp-events.txt b/QMP/qmp-events.txt
index 92fe5fb..885230e 100644
--- a/QMP/qmp-events.txt
+++ b/QMP/qmp-events.txt
@@ -172,6 +172,26 @@  Data:
   },
   "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }
 
+NIC_RX_FILTER_CHANGED
+-----------------
+
+Emitted when rx-filter configuration of nic is changed by the guest.
+Each nic has a flag to control event emit, the flag is set to false
+when it emits one event of the nic, the flag is set to true when
+management queries the rx-filter of the nic. This is used to avoid
+events flooding.
+
+Data:
+
+- "name": net client name (json-string)
+- "path": device path (json-string)
+
+{ "event": "NIC_RX_FILTER_CHANGED",
+  "data": { "name": "vnet0",
+            "path": "/machine/peripheral/vnet0/virtio-backend" },
+  "timestamp": { "seconds": 1368697518, "microseconds": 326866 } }
+}
+
 RESET
 -----
 
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 1ea9556..ae1eab6 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -21,6 +21,8 @@ 
 #include "hw/virtio/virtio-net.h"
 #include "net/vhost_net.h"
 #include "hw/virtio/virtio-bus.h"
+#include "qapi/qmp/qjson.h"
+#include "monitor/monitor.h"
 
 #define VIRTIO_NET_VM_VERSION    11
 
@@ -192,6 +194,104 @@  static void virtio_net_set_link_status(NetClientState *nc)
     virtio_net_set_status(vdev, vdev->status);
 }
 
+static void rxfilter_notify(NetClientState *nc)
+{
+    QObject *event_data;
+    VirtIONet *n = qemu_get_nic_opaque(nc);
+
+    if (nc->rxfilter_notify_enabled) {
+        event_data = qobject_from_jsonf("{ 'name': %s, 'path': %s }",
+                           n->netclient_name,
+                           object_get_canonical_path(OBJECT(n->qdev)));
+        monitor_protocol_event(QEVENT_NIC_RX_FILTER_CHANGED, event_data);
+        qobject_decref(event_data);
+        /* disable event notification to avoid events flooding */
+        nc->rxfilter_notify_enabled = 0;
+    }
+}
+
+static char *mac_strdup_printf(uint8_t *mac)
+{
+    return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", mac[0],
+                            mac[1], mac[2], mac[3], mac[4], mac[5]);
+}
+
+static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc)
+{
+    VirtIONet *n = qemu_get_nic_opaque(nc);
+    RxFilterInfo *info;
+    strList *str_list = NULL;
+    strList *entry;
+    VlanTableEntryList *vlan_list = NULL;
+    VlanTableEntryList *vlan_entry;
+    VlanTableEntry *table_entry;
+    int i;
+
+    info = g_malloc0(sizeof(*info));
+    info->name = g_strdup(nc->name);
+    info->promiscuous = n->promisc;
+
+    if (n->nouni) {
+        info->unicast = RX_STATE_NONE;
+    } else if (n->alluni) {
+        info->unicast = RX_STATE_ALL;
+    } else {
+        info->unicast = RX_STATE_NORMAL;
+    }
+
+    if (n->nomulti) {
+        info->multicast = RX_STATE_NONE;
+    } else if (n->allmulti) {
+        info->multicast = RX_STATE_ALL;
+    } else {
+        info->multicast = RX_STATE_NORMAL;
+    }
+
+    info->broadcast_allowed = n->nobcast;
+    info->multicast_overflow = n->mac_table.multi_overflow;
+    info->unicast_overflow = n->mac_table.uni_overflow;
+
+    info->main_mac = mac_strdup_printf(n->mac);
+
+    for (i = 0; i < n->mac_table.first_multi; i++) {
+        entry = g_malloc0(sizeof(*entry));
+        entry->value = mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
+        entry->next = str_list;
+        str_list = entry;
+    }
+    info->unicast_table = str_list;
+
+    str_list = NULL;
+    for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
+        entry = g_malloc0(sizeof(*entry));
+        entry->value = mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
+        entry->next = str_list;
+        str_list = entry;
+    }
+    info->multicast_table = str_list;
+
+    i = 0;
+    while (i < MAX_VLAN >> 5) {
+        /* ignore the entries that have no active vlan */
+        if (n->vlans[i] == 0) {
+            i++;
+            continue;
+        }
+        vlan_entry = g_malloc0(sizeof(*vlan_entry));
+        vlan_entry->value = g_malloc0(sizeof(*table_entry));
+        vlan_entry->value->index = i;
+        vlan_entry->value->value = n->vlans[i++];
+        vlan_entry->next = vlan_list;
+        vlan_list = vlan_entry;
+    }
+    info->vlan_table = vlan_list;
+
+    /* enable event notification after query */
+    nc->rxfilter_notify_enabled = 1;
+
+    return info;
+}
+
 static void virtio_net_reset(VirtIODevice *vdev)
 {
     VirtIONet *n = VIRTIO_NET(vdev);
@@ -420,6 +520,7 @@  static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
 {
     uint8_t on;
     size_t s;
+    NetClientState *nc = qemu_get_queue(n->nic);
 
     s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on));
     if (s != sizeof(on)) {
@@ -442,6 +543,8 @@  static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
         return VIRTIO_NET_ERR;
     }
 
+    rxfilter_notify(nc);
+
     return VIRTIO_NET_OK;
 }
 
@@ -487,6 +590,7 @@  static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
 {
     struct virtio_net_ctrl_mac mac_data;
     size_t s;
+    NetClientState *nc = qemu_get_queue(n->nic);
 
     if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) {
         if (iov_size(iov, iov_cnt) != sizeof(n->mac)) {
@@ -495,6 +599,8 @@  static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
         s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac));
         assert(s == sizeof(n->mac));
         qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
+        rxfilter_notify(nc);
+
         return VIRTIO_NET_OK;
     }
 
@@ -559,6 +665,8 @@  static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
         n->mac_table.multi_overflow = 1;
     }
 
+    rxfilter_notify(nc);
+
     return VIRTIO_NET_OK;
 }
 
@@ -567,6 +675,7 @@  static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
 {
     uint16_t vid;
     size_t s;
+    NetClientState *nc = qemu_get_queue(n->nic);
 
     s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid));
     vid = lduw_p(&vid);
@@ -584,6 +693,8 @@  static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
     else
         return VIRTIO_NET_ERR;
 
+    rxfilter_notify(nc);
+
     return VIRTIO_NET_OK;
 }
 
@@ -1312,6 +1423,7 @@  static NetClientInfo net_virtio_info = {
     .receive = virtio_net_receive,
         .cleanup = virtio_net_cleanup,
     .link_status_changed = virtio_net_set_link_status,
+    .query_rx_filter = virtio_net_query_rxfilter,
 };
 
 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx)
diff --git a/include/monitor/monitor.h b/include/monitor/monitor.h
index 1a6cfcf..1942cc4 100644
--- a/include/monitor/monitor.h
+++ b/include/monitor/monitor.h
@@ -41,6 +41,7 @@  typedef enum MonitorEvent {
     QEVENT_BLOCK_JOB_READY,
     QEVENT_DEVICE_DELETED,
     QEVENT_DEVICE_TRAY_MOVED,
+    QEVENT_NIC_RX_FILTER_CHANGED,
     QEVENT_SUSPEND,
     QEVENT_SUSPEND_DISK,
     QEVENT_WAKEUP,
diff --git a/include/net/net.h b/include/net/net.h
index 43d85a1..30e4b04 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -49,6 +49,7 @@  typedef ssize_t (NetReceiveIOV)(NetClientState *, const struct iovec *, int);
 typedef void (NetCleanup) (NetClientState *);
 typedef void (LinkStatusChanged)(NetClientState *);
 typedef void (NetClientDestructor)(NetClientState *);
+typedef RxFilterInfo *(QueryRxFilter)(NetClientState *);
 
 typedef struct NetClientInfo {
     NetClientOptionsKind type;
@@ -59,6 +60,7 @@  typedef struct NetClientInfo {
     NetCanReceive *can_receive;
     NetCleanup *cleanup;
     LinkStatusChanged *link_status_changed;
+    QueryRxFilter *query_rx_filter;
     NetPoll *poll;
 } NetClientInfo;
 
@@ -74,6 +76,7 @@  struct NetClientState {
     unsigned receive_disabled : 1;
     NetClientDestructor *destructor;
     unsigned int queue_index;
+    unsigned rxfilter_notify_enabled:1;
 };
 
 typedef struct NICState {
diff --git a/monitor.c b/monitor.c
index 6ce2a4e..5e64fe8 100644
--- a/monitor.c
+++ b/monitor.c
@@ -490,6 +490,7 @@  static const char *monitor_event_names[] = {
     [QEVENT_BLOCK_JOB_READY] = "BLOCK_JOB_READY",
     [QEVENT_DEVICE_DELETED] = "DEVICE_DELETED",
     [QEVENT_DEVICE_TRAY_MOVED] = "DEVICE_TRAY_MOVED",
+    [QEVENT_NIC_RX_FILTER_CHANGED] = "NIC_RX_FILTER_CHANGED",
     [QEVENT_SUSPEND] = "SUSPEND",
     [QEVENT_SUSPEND_DISK] = "SUSPEND_DISK",
     [QEVENT_WAKEUP] = "WAKEUP",
diff --git a/net/net.c b/net/net.c
index 43a74e4..33abffe 100644
--- a/net/net.c
+++ b/net/net.c
@@ -961,6 +961,53 @@  void print_net_client(Monitor *mon, NetClientState *nc)
                    nc->info_str);
 }
 
+RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
+                                      Error **errp)
+{
+    NetClientState *nc;
+    RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
+
+    QTAILQ_FOREACH(nc, &net_clients, next) {
+        RxFilterInfoList *entry;
+        RxFilterInfo *info;
+
+        /* only query rx-filter information of nic */
+        if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) {
+            continue;
+        }
+        if (has_name && strcmp(nc->name, name) != 0) {
+            continue;
+        }
+
+        if (nc->info->query_rx_filter) {
+            info = nc->info->query_rx_filter(nc);
+            entry = g_malloc0(sizeof(*entry));
+            entry->value = info;
+
+            if (!filter_list) {
+                filter_list = entry;
+            } else {
+                last_entry->next = entry;
+            }
+            last_entry = entry;
+        } else if (has_name) {
+            error_setg(errp, "net client(%s) doesn't support"
+                       " rx-filter querying", name);
+            break;
+        }
+    }
+
+    if (filter_list == NULL && !error_is_set(errp)) {
+        if (has_name) {
+            error_setg(errp, "invalid net client name: %s", name);
+        } else {
+            error_setg(errp, "no net client supports rx-filter querying");
+        }
+    }
+
+    return filter_list;
+}
+
 void do_info_network(Monitor *mon, const QDict *qdict)
 {
     NetClientState *nc, *peer;
diff --git a/qapi-schema.json b/qapi-schema.json
index ef1f657..fb6f12c 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -3618,3 +3618,92 @@ 
             '*cpuid-input-ecx': 'int',
             'cpuid-register': 'X86CPURegister32',
             'features': 'int' } }
+
+##
+# @RxState:
+#
+# Packets receiving state
+#
+# @normal: filter assigned packets according to the mac-table
+#
+# @none: don't receive any assigned packet
+#
+# @all: receive all assigned packets
+#
+##
+{ 'enum': 'RxState', 'data': [ 'normal', 'none', 'all' ] }
+
+##
+# @VlanTableEntry
+#
+# Entry detail of vlan filter table
+#
+# @index: index of vlan filter table
+#
+# @value: 32 bit of indicator for active vlans
+#
+# Since 1.6
+##
+
+{ 'type': 'VlanTableEntry', 'data': { 'index': 'int', 'value': 'uint32' } }
+
+##
+# @RxFilterInfo:
+#
+# Rx-filter information for a nic.
+#
+# @name: net client name
+#
+# @promiscuous: whether promiscuous mode is enabled
+#
+# @multicast: multicast receive state
+#
+# @unicast: unicast receive state
+#
+# @broadcast-allowed: whether to receive broadcast
+#
+# @multicast-overflow: multicast table is overflowed or not
+#
+# @unicast-overflow: unicast table is overflowed or not
+#
+# @main-mac: the main macaddr string
+#
+# @vlan-table: a list of @VlanTableEntry
+#
+# @unicast-table: a list of unicast macaddr string
+#
+# @multicast-table: a list of multicast macaddr string
+#
+# Since 1.6
+##
+
+{ 'type': 'RxFilterInfo',
+  'data': {
+    'name':               'str',
+    'promiscuous':        'bool',
+    'multicast':          'RxState',
+    'unicast':            'RxState',
+    'broadcast-allowed':  'bool',
+    'multicast-overflow': 'bool',
+    'unicast-overflow':   'bool',
+    'main-mac':           'str',
+    'vlan-table':         ['VlanTableEntry'],
+    'unicast-table':      ['str'],
+    'multicast-table':    ['str'] }}
+
+##
+# @query-rx-filter:
+#
+# Return rx-filter information for all nics (or for the given nic).
+#
+# @name: #optional net client name
+#
+# Returns: list of @RxFilterInfo for all nics (or for the given nic).
+#          Returns an error if the given @name doesn't exist, or given
+#          nic doesn't support rx-filter querying, or no net client
+#          supports rx-filter querying
+#
+# Since: 1.6
+##
+{ 'command': 'query-rx-filter', 'data': { '*name': 'str' },
+  'returns': ['RxFilterInfo'] }
diff --git a/qmp-commands.hx b/qmp-commands.hx
index ffd130e..e76e9a2 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -2932,3 +2932,69 @@  Example:
 <- { "return": {} }
 
 EQMP
+    {
+        .name       = "query-rx-filter",
+        .args_type  = "name:s?",
+        .mhandler.cmd_new = qmp_marshal_input_query_rx_filter,
+    },
+
+SQMP
+query-rx-filter
+---------------
+
+Show rx-filter information.
+
+Returns a json-array of rx-filter information for all nics (or for the
+given nic), returning an error if the given nic doesn't exist, or
+given nic doesn't support rx-filter querying, or no net client
+supports rx-filter querying.
+
+The query will clear the event notification flag of each nic, then qemu
+will start to emit event to QMP monitor.
+
+Each array entry contains the following:
+
+- "name": net client name (json-string)
+- "promiscuous": promiscuous mode is enabled (json-bool)
+- "multicast": multicast receive state (one of 'normal', 'none', 'all')
+- "unicast": unicast receive state  (one of 'normal', 'none', 'all')
+- "broadcast-allowed": allow to receive broadcast (json-bool)
+- "multicast-overflow": multicast table is overflowed (json-bool)
+- "unicast-overflow": unicast table is overflowed (json-bool)
+- "main-mac": main macaddr string (json-string)
+- "vlan-table": a json-array of vlan-table entry
+    - "index": index of vlan filter table (json-int)
+    - "value": 32 bit of indicator for active vlans
+- "unicast-table": a json-array of unicast macaddr string
+- "multicast-table": a json-array of multicast macaddr string
+
+Example:
+
+-> { "execute": "query-rx-filter", "arguments": { "name": "vnet0" } }
+<- { "return": [
+        {
+            "promiscuous": true,
+            "name": "vnet0",
+            "main-mac": "52:54:00:12:34:56",
+            "unicast": "normal",
+            "vlan-table": [
+                { "index": 0,
+                  "entry": 1
+                }
+            ],
+            "unicast-table": [
+            ],
+            "multicast": "normal",
+            "multicast-overflow": false,
+            "unicast-overflow": false,
+            "multicast-table": [
+                "01:00:5e:00:00:01",
+                "33:33:00:00:00:01",
+                "33:33:ff:12:34:56"
+            ],
+            "broadcast-allowed": false
+        }
+      ]
+   }
+
+EQMP