Mcast rewrite optimisations

[vpp.git] / src / vnet / ip / ip4_forward.c

diff --git a/src/vnet/ip/ip4_forward.c b/src/vnet/ip/ip4_forward.c
index 7c56a29..28b6203 100644 (file)
--- a/src/vnet/ip/ip4_forward.c
+++ b/src/vnet/ip/ip4_forward.c
@@ -1940,6 +1940,16 @@ typedef enum
   IP4_REWRITE_NEXT_ICMP_ERROR,
 } ip4_rewrite_next_t;
 
+/**
+ * This bits of an IPv4 address to mask to construct a multicast
+ * MAC address
+ */
+#if CLIB_ARCH_IS_BIG_ENDIAN
+#define IP4_MCAST_ADDR_MASK 0x007fffff
+#else
+#define IP4_MCAST_ADDR_MASK 0xffff7f00
+#endif
+
 always_inline uword
 ip4_rewrite_inline (vlib_main_t * vm,
                    vlib_node_runtime_t * node,
@@ -2197,8 +2207,16 @@ ip4_rewrite_inline (vlib_main_t * vm,
              /*
               * copy bytes from the IP address into the MAC rewrite
               */
-             vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
-             vnet_fixup_one_header (adj1[0], &ip1->dst_address, ip1);
+             vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
+                                         adj0->
+                                         rewrite_header.dst_mcast_offset,
+                                         &ip0->dst_address.as_u32,
+                                         (u8 *) ip0);
+             vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
+                                         adj0->
+                                         rewrite_header.dst_mcast_offset,
+                                         &ip1->dst_address.as_u32,
+                                         (u8 *) ip1);
            }
 
          vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
@@ -2277,7 +2295,11 @@ ip4_rewrite_inline (vlib_main_t * vm,
              /*
               * copy bytes from the IP address into the MAC rewrite
               */
-             vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
+             vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
+                                         adj0->
+                                         rewrite_header.dst_mcast_offset,
+                                         &ip0->dst_address.as_u32,
+                                         (u8 *) ip0);
            }
 
          /* Update packet buffer attributes/set output interface. */