tap gso: experimental support

[vpp.git] / src / vnet / devices / virtio / node.c

diff --git a/src/vnet/devices/virtio/node.c b/src/vnet/devices/virtio/node.c
index 6b82c41..fcc0f8a 100644 (file)
--- a/src/vnet/devices/virtio/node.c
+++ b/src/vnet/devices/virtio/node.c
@@ -30,6 +30,7 @@
 #include <vnet/feature/feature.h>
 #include <vnet/ip/ip4_packet.h>
 #include <vnet/ip/ip6_packet.h>
+#include <vnet/udp/udp_packet.h>
 #include <vnet/devices/virtio/virtio.h>
 
 
@@ -140,9 +141,86 @@ more:
   goto more;
 }
 
+static_always_inline void
+fill_gso_buffer_flags (vlib_buffer_t * b0, struct virtio_net_hdr_v1 *hdr)
+{
+  u8 l4_proto = 0;
+  u8 l4_hdr_sz = 0;
+  if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
+
+    {
+      ethernet_header_t *eh = (ethernet_header_t *) b0->data;
+      u16 ethertype = clib_net_to_host_u16 (eh->type);
+      u16 l2hdr_sz = sizeof (ethernet_header_t);
+
+      vnet_buffer (b0)->l2_hdr_offset = 0;
+      vnet_buffer (b0)->l3_hdr_offset = l2hdr_sz;
+      if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP4))
+       {
+         ip4_header_t *ip4 = (ip4_header_t *) (b0->data + l2hdr_sz);
+         vnet_buffer (b0)->l4_hdr_offset = l2hdr_sz + ip4_header_bytes (ip4);
+         l4_proto = ip4->protocol;
+         b0->flags |=
+           (VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_L2_HDR_OFFSET_VALID
+            | VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
+            VNET_BUFFER_F_L4_HDR_OFFSET_VALID);
+         b0->flags |= VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
+       }
+      else if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP6))
+       {
+         ip6_header_t *ip6 = (ip6_header_t *) (b0->data + l2hdr_sz);
+         /* FIXME IPv6 EH traversal */
+         vnet_buffer (b0)->l4_hdr_offset = l2hdr_sz + sizeof (ip6_header_t);
+         l4_proto = ip6->protocol;
+         b0->flags |=
+           (VNET_BUFFER_F_IS_IP6 | VNET_BUFFER_F_L2_HDR_OFFSET_VALID
+            | VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
+            VNET_BUFFER_F_L4_HDR_OFFSET_VALID);
+         b0->flags |= VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
+       }
+      if (l4_proto == IP_PROTOCOL_TCP)
+       {
+         b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
+         tcp_header_t *tcp = (tcp_header_t *) (b0->data +
+                                               vnet_buffer
+                                               (b0)->l4_hdr_offset);
+         l4_hdr_sz = tcp_header_bytes (tcp);
+         tcp->checksum = 0;
+       }
+      else if (l4_proto == IP_PROTOCOL_UDP)
+       {
+         b0->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
+         udp_header_t *udp = (udp_header_t *) (b0->data +
+                                               vnet_buffer
+                                               (b0)->l4_hdr_offset);
+         l4_hdr_sz = sizeof (*udp);
+         udp->checksum = 0;
+       }
+    }
+
+  if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV4)
+    {
+      ASSERT (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM);
+      vnet_buffer2 (b0)->gso_size = hdr->gso_size;
+      vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
+      b0->flags |= VNET_BUFFER_F_GSO;
+      b0->flags |= VNET_BUFFER_F_IS_IP4;
+    }
+  if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV6)
+    {
+      ASSERT (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM);
+      vnet_buffer2 (b0)->gso_size = hdr->gso_size;
+      vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
+      b0->flags |= VNET_BUFFER_F_GSO;
+      b0->flags |= VNET_BUFFER_F_IS_IP6;
+    }
+}
+
+
 static_always_inline uword
 virtio_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
-                           vlib_frame_t * frame, virtio_if_t * vif, u16 qid)
+                           vlib_frame_t * frame, virtio_if_t * vif, u16 qid,
+                           int gso_enabled)
 {
   vnet_main_t *vnm = vnet_get_main ();
   u32 thread_index = vm->thread_index;
@@ -187,6 +265,10 @@ virtio_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
          b0->current_length = len;
          b0->total_length_not_including_first_buffer = 0;
          b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
+
+         if (gso_enabled)
+           fill_gso_buffer_flags (b0, hdr);
+
          vnet_buffer (b0)->sw_if_index[VLIB_RX] = vif->sw_if_index;
          vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 
@@ -286,8 +368,12 @@ virtio_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
     mif = vec_elt_at_index (nm->interfaces, dq->dev_instance);
     if (mif->flags & VIRTIO_IF_FLAG_ADMIN_UP)
       {
-       n_rx += virtio_device_input_inline (vm, node, frame, mif,
-                                           dq->queue_id);
+       if (mif->gso_enabled)
+         n_rx += virtio_device_input_inline (vm, node, frame, mif,
+                                             dq->queue_id, 1);
+       else
+         n_rx += virtio_device_input_inline (vm, node, frame, mif,
+                                             dq->queue_id, 0);
       }
   }