On Thu, Feb 20, 2014 at 12:46:14PM -0500, Vlad Yasevich wrote: > On 02/20/2014 11:38 AM, Amos Kong wrote: > > Stefan Fritsch just fixed a virtio-net driver bug [1], virtio-net won't > > filter out VLAN-tagged packets if VIRTIO_NET_F_CTRL_VLAN isn't negotiated. > > > > This patch added a new field to @RxFilterInfo to indicate if management > > uses the vlan table. > > > > [1] http://lists.nongnu.org/archive/html/qemu-devel/2014-02/msg02604.html > > > > Signed-off-by: Amos Kong <ak...@redhat.com> > > --- > > V2: don't make vlan-table optional, add a flag to indicate > > if vlan table is used by management > > --- > > hw/net/virtio-net.c | 38 +++++++++++++++++++++++++------------- > > qapi-schema.json | 3 +++ > > qmp-commands.hx | 2 ++ > > 3 files changed, 30 insertions(+), 13 deletions(-) > > > > diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c > > index 3626608..f591f4e 100644 > > --- a/hw/net/virtio-net.c > > +++ b/hw/net/virtio-net.c > > @@ -222,13 +222,33 @@ static char *mac_strdup_printf(const uint8_t *mac) > > mac[1], mac[2], mac[3], mac[4], mac[5]); > > } > > > > +static intList *get_vlan_table(VirtIONet *n) > > +{ > > + intList *list, *entry; > > + int i, j; > > + > > + list = NULL; > > + for (i = 0; i < MAX_VLAN >> 5; i++) { > > + for (j = 0; n->vlans[i] && j < 0x1f; j++) { > > + if (n->vlans[i] & (1U << j)) { > > + entry = g_malloc0(sizeof(*entry)); > > + entry->value = (i << 5) + j; > > + entry->next = list; > > + list = entry; > > + } > > + } > > + } > > + > > + return list; > > +} > > + > > static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc) > > { > > VirtIONet *n = qemu_get_nic_opaque(nc); > > + VirtIODevice *vdev = VIRTIO_DEVICE(n); > > RxFilterInfo *info; > > strList *str_list, *entry; > > - intList *int_list, *int_entry; > > - int i, j; > > + int i; > > > > info = g_malloc0(sizeof(*info)); > > info->name = g_strdup(nc->name); > > @@ -273,19 +293,11 @@ static RxFilterInfo > > *virtio_net_query_rxfilter(NetClientState *nc) > > str_list = entry; > > } > > info->multicast_table = str_list; > > + info->vlan_table = get_vlan_table(n); > > > > - int_list = NULL; > > - for (i = 0; i < MAX_VLAN >> 5; i++) { > > - for (j = 0; n->vlans[i] && j < 0x1f; j++) { > > - if (n->vlans[i] & (1U << j)) { > > - int_entry = g_malloc0(sizeof(*int_entry)); > > - int_entry->value = (i << 5) + j; > > - int_entry->next = int_list; > > - int_list = int_entry; > > - } > > - } > > + if ((1 << VIRTIO_NET_F_CTRL_VLAN) & vdev->guest_features) { > > + info->vlan = true; > > } > > So, in the case that vlan filtering is not supported in the guest > we get: > "vlan": false, > "vlan-table": [ > 0, > 1, > 2, > ... > 4095 > ] > since virtio_net now initializes the table to all 1s. > Seems a bit awkward. We are providing a lot of data that > is simply going to be ignored.
In Stefan's patch [1], qemu fills all vlan ids to 1, then all the packets will come to guest. For the host device, it also should not filter out any vlan-tagged packets when VIRTIO_NET_F_CTRL_VLAN is not negotiated. We should also fill vlan ids of host device to 1, then vlan-filter of host device will not perform. If so, we don't need my patch, just pass [0,1,2,...4095] to management as past. The new field in RxFilterInfo isn't necessary. [1] [PATCH] virtio-net: Do not filter VLANs without F_CTRL_VLAN Thanks, Amos > > - info->vlan_table = int_list; > > > > /* enable event notification after query */ > > nc->rxfilter_notify_enabled = 1; > > diff --git a/qapi-schema.json b/qapi-schema.json > > index 7cfb5e5..5b54e94 100644 > > --- a/qapi-schema.json > > +++ b/qapi-schema.json > > @@ -4032,6 +4032,8 @@ > > # > > # @unicast-overflow: unicast table is overflowed or not > > # > > +# @vlan: whether management uses the vlan table > > +# > > The above description seems a bit confusing to me. The value > we are returning describes whether or not qemu is performing > vlan filtering. I am not sure if it has any bearing on what > management may be doing. > > I think the idea is that management, in the future, would look at > this value and make some decision about applying provided filter > to the current host configuration. > > > # @main-mac: the main macaddr string > > # > > # @vlan-table: a list of active vlan id > > @@ -4052,6 +4054,7 @@ > > 'broadcast-allowed': 'bool', > > 'multicast-overflow': 'bool', > > 'unicast-overflow': 'bool', > > + 'vlan': 'bool', > > Not terribly descriptive. May be call it vlan-filter? > > Thanks > -vlad > > 'main-mac': 'str', > > 'vlan-table': ['int'], > > 'unicast-table': ['str'], > > diff --git a/qmp-commands.hx b/qmp-commands.hx > > index cce6b81..b170c79 100644 > > --- a/qmp-commands.hx > > +++ b/qmp-commands.hx > > @@ -3307,6 +3307,7 @@ Each array entry contains the following: > > - "broadcast-allowed": allow to receive broadcast (json-bool) > > - "multicast-overflow": multicast table is overflowed (json-bool) > > - "unicast-overflow": unicast table is overflowed (json-bool) > > +- "vlan": management uses the vlan table (json-bool) > > - "main-mac": main macaddr string (json-string) > > - "vlan-table": a json-array of active vlan id > > - "unicast-table": a json-array of unicast macaddr string > > @@ -3321,6 +3322,7 @@ Example: > > "name": "vnet0", > > "main-mac": "52:54:00:12:34:56", > > "unicast": "normal", > > + "vlan": true, > > "vlan-table": [ > > 4, > > 0 > >
