tap gso: experimental support

[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 b3ae29a..ec4eda4 100644 (file)
--- a/src/vnet/ip/ip4_forward.c
+++ b/src/vnet/ip/ip4_forward.c
@@ -2186,10 +2186,11 @@ ip4_ttl_and_checksum_check (vlib_buffer_t * b, ip4_header_t * ip, u16 * next,
 
 
 always_inline uword
-ip4_rewrite_inline (vlib_main_t * vm,
-                   vlib_node_runtime_t * node,
-                   vlib_frame_t * frame,
-                   int do_counters, int is_midchain, int is_mcast)
+ip4_rewrite_inline_with_gso (vlib_main_t * vm,
+                            vlib_node_runtime_t * node,
+                            vlib_frame_t * frame,
+                            int do_counters, int is_midchain, int is_mcast,
+                            int do_gso)
 {
   ip_lookup_main_t *lm = &ip4_main.lookup_main;
   u32 *from = vlib_frame_vector_args (frame);
@@ -2267,12 +2268,20 @@ ip4_rewrite_inline (vlib_main_t * vm,
       CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
 
       /* Check MTU of outgoing interface. */
-      ip4_mtu_check (b[0], clib_net_to_host_u16 (ip0->length),
+      u16 ip0_len = clib_net_to_host_u16 (ip0->length);
+      u16 ip1_len = clib_net_to_host_u16 (ip1->length);
+
+      if (do_gso && (b[0]->flags & VNET_BUFFER_F_GSO))
+       ip0_len = gso_mtu_sz (b[0]);
+      if (do_gso && (b[1]->flags & VNET_BUFFER_F_GSO))
+       ip1_len = gso_mtu_sz (b[1]);
+
+      ip4_mtu_check (b[0], ip0_len,
                     adj0[0].rewrite_header.max_l3_packet_bytes,
                     ip0->flags_and_fragment_offset &
                     clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
                     next + 0, &error0);
-      ip4_mtu_check (b[1], clib_net_to_host_u16 (ip1->length),
+      ip4_mtu_check (b[1], ip1_len,
                     adj1[0].rewrite_header.max_l3_packet_bytes,
                     ip1->flags_and_fragment_offset &
                     clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
@@ -2395,7 +2404,11 @@ ip4_rewrite_inline (vlib_main_t * vm,
       vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
 
       /* Check MTU of outgoing interface. */
-      ip4_mtu_check (b[0], clib_net_to_host_u16 (ip0->length),
+      u16 ip0_len = clib_net_to_host_u16 (ip0->length);
+      if (do_gso && (b[0]->flags & VNET_BUFFER_F_GSO))
+       ip0_len = gso_mtu_sz (b[0]);
+
+      ip4_mtu_check (b[0], ip0_len,
                     adj0[0].rewrite_header.max_l3_packet_bytes,
                     ip0->flags_and_fragment_offset &
                     clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
@@ -2465,6 +2478,23 @@ ip4_rewrite_inline (vlib_main_t * vm,
   return frame->n_vectors;
 }
 
+always_inline uword
+ip4_rewrite_inline (vlib_main_t * vm,
+                   vlib_node_runtime_t * node,
+                   vlib_frame_t * frame,
+                   int do_counters, int is_midchain, int is_mcast)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  if (PREDICT_FALSE (vnm->interface_main.gso_interface_count > 0))
+    return ip4_rewrite_inline_with_gso (vm, node, frame, do_counters,
+                                       is_midchain, is_mcast,
+                                       1 /* do_gso */ );
+  else
+    return ip4_rewrite_inline_with_gso (vm, node, frame, do_counters,
+                                       is_midchain, is_mcast,
+                                       0 /* no do_gso */ );
+}
+
 
 /** @brief IPv4 rewrite node.
     @node ip4-rewrite