qemu:virtio-net: Add additional MACs via a filter table (Alex Williamson)

Create a filter table and allow the guest to populate it with the
MAC class control commands.  We manage the size and usage of the
filter table including enabling promiscuous and all-multi modes
as necessary.  The guest should therefore assume the table is
infinite.  Eventually this might allow us to bind directly to a
hardware NIC and manipulate a physical MAC filter.

The specifics of the TABLE_SET command are documented in
virtio-net.h.  Separate buffers in the same command are used
for unicaste and multicast addresses for priority and
sychronization.  With this we can export the VIRTIO_NET_F_CTRL_RX
feature bit.

Signed-off-by: Alex Williamson <alex.williamson@hp.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6539 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 22 insertions, 0 deletions

diff --git a/hw/virtio-net.h b/hw/virtio-net.h
index ce8e4b4..291fa9d 100644
--- a/hw/virtio-net.h
+++ b/hw/virtio-net.h
@@ -113,4 +113,26 @@ typedef uint8_t virtio_net_ctrl_ack;
  #define VIRTIO_NET_CTRL_RX_MODE_PROMISC      0
  #define VIRTIO_NET_CTRL_RX_MODE_ALLMULTI     1
 
+/*
+ * Control the MAC filter table.
+ *
+ * The MAC filter table is managed by the hypervisor, the guest should
+ * assume the size is infinite.  Filtering should be considered
+ * non-perfect, ie. based on hypervisor resources, the guest may
+ * received packets from sources not specified in the filter list.
+ *
+ * In addition to the class/cmd header, the TABLE_SET command requires
+ * two out scatterlists.  Each contains a 4 byte count of entries followed
+ * by a concatenated byte stream of the ETH_ALEN MAC addresses.  The
+ * first sg list contains unicast addresses, the second is for multicast.
+ * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
+ * is available.
+ */
+struct virtio_net_ctrl_mac {
+    uint32_t entries;
+    uint8_t macs[][ETH_ALEN];
+};
+#define VIRTIO_NET_CTRL_MAC    1
+ #define VIRTIO_NET_CTRL_MAC_TABLE_SET        0
+
 #endif