gso: add protocol header parser

Type: feature

Change-Id: I7c6be2b96d19f82be237f6159944f3164ea512d0
Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>

1 files changed, 9 insertions, 29 deletions

diff --git a/src/vnet/pg/input.c b/src/vnet/pg/input.c
index c47dfe270e7..f4f6bd46fe7 100644
--- a/src/vnet/pg/input.c
+++ b/src/vnet/pg/input.c
@@ -1535,9 +1535,9 @@ fill_gso_buffer_flags (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
     {
       vlib_buffer_t *b0 = vlib_get_buffer (vm, buffers[i]);
       u8 l4_proto = 0;
-      u8 l4_hdr_sz = 0;
 
-      ethernet_header_t *eh = (ethernet_header_t *) b0->data;
+      ethernet_header_t *eh =
+	(ethernet_header_t *) vlib_buffer_get_current (b0);
       u16 ethertype = clib_net_to_host_u16 (eh->type);
       u16 l2hdr_sz = sizeof (ethernet_header_t);
 
@@ -1555,50 +1555,30 @@ fill_gso_buffer_flags (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
 	    }
 	}
 
-      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);
+	  ip4_header_t *ip4 =
+	    (ip4_header_t *) (vlib_buffer_get_current (b0) + l2hdr_sz);
 	  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;
+	    (VNET_BUFFER_F_IS_IP4 | 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);
+	  ip6_header_t *ip6 =
+	    (ip6_header_t *) (vlib_buffer_get_current (b0) + 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_IS_IP6;
 	}
       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;
-	  vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
+	  b0->flags |= (VNET_BUFFER_F_OFFLOAD_TCP_CKSUM | VNET_BUFFER_F_GSO);
 	  vnet_buffer2 (b0)->gso_size = packet_data_size;
-	  b0->flags |= VNET_BUFFER_F_GSO;
 	}
       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);
-	  vnet_buffer2 (b0)->gso_l4_hdr_sz = sizeof (*udp);
-	  udp->checksum = 0;
 	}
     }
 }