virtio-net: reorganize receive_filter()
Reorganize receive_filter to better handle the split between
unicast and multicast filtering. This allows us to skip the
broadcast check on unicast packets and leads to more opportunities
for optimization.
Signed-off-by: Alex Williamson <alex.williamson@hp.com>
Signed-off-by: Mark McLoughlin <markmc@redhat.com>
diff --git a/hw/virtio-net.c b/hw/virtio-net.c
index 13eb0d1..445976a 100644
--- a/hw/virtio-net.c
+++ b/hw/virtio-net.c
@@ -347,14 +347,17 @@
return 0;
}
- if ((ptr[0] & 1) && n->allmulti)
- return 1;
-
- if (!memcmp(ptr, bcast, sizeof(bcast)))
- return 1;
-
- if (!memcmp(ptr, n->mac, ETH_ALEN))
- return 1;
+ if (ptr[0] & 1) { // multicast
+ if (!memcmp(ptr, bcast, sizeof(bcast))) {
+ return 1;
+ } else if (n->allmulti) {
+ return 1;
+ }
+ } else { // unicast
+ if (!memcmp(ptr, n->mac, ETH_ALEN)) {
+ return 1;
+ }
+ }
for (i = 0; i < n->mac_table.in_use; i++) {
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN))