gso: add protocol header parser
Type: feature
Change-Id: I7c6be2b96d19f82be237f6159944f3164ea512d0
Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>
diff --git a/src/vnet/gso/gso.h b/src/vnet/gso/gso.h
index 8e174df..79869c2 100644
--- a/src/vnet/gso/gso.h
+++ b/src/vnet/gso/gso.h
@@ -16,10 +16,25 @@
#ifndef included_gso_h
#define included_gso_h
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/ip/ip4_packet.h>
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/udp/udp_packet.h>
#include <vnet/vnet.h>
typedef struct
{
+ i16 l2_hdr_offset;
+ i16 l3_hdr_offset;
+ i16 l4_hdr_offset;
+ u16 l4_hdr_sz;
+ i16 outer_l2_hdr_offset;
+ i16 outer_l3_hdr_offset;
+ i16 outer_l4_hdr_offset;
+} gso_header_offset_t;
+
+typedef struct
+{
vlib_main_t *vlib_main;
vnet_main_t *vnet_main;
u16 msg_id_base;
@@ -29,6 +44,86 @@
int vnet_sw_interface_gso_enable_disable (u32 sw_if_index, u8 enable);
+static_always_inline gso_header_offset_t
+vnet_gso_header_offset_parser (vlib_buffer_t * b0, int is_ip6)
+{
+ gso_header_offset_t gho = { 0 };
+ u8 l4_proto = 0;
+ u8 l4_hdr_sz = 0;
+
+ if (PREDICT_TRUE ((b0->flags & (VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
+ VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
+ VNET_BUFFER_F_L4_HDR_OFFSET_VALID)) ==
+ (VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
+ VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
+ VNET_BUFFER_F_L4_HDR_OFFSET_VALID)))
+ {
+ gho.l2_hdr_offset = vnet_buffer (b0)->l2_hdr_offset;
+ gho.l3_hdr_offset = vnet_buffer (b0)->l3_hdr_offset;
+ gho.l4_hdr_offset = vnet_buffer (b0)->l4_hdr_offset;
+ gho.l4_hdr_sz = vnet_buffer2 (b0)->gso_l4_hdr_sz;
+ return gho;
+ }
+
+ 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);
+
+ if (ethernet_frame_is_tagged (ethertype))
+ {
+ ethernet_vlan_header_t *vlan = (ethernet_vlan_header_t *) (eh + 1);
+
+ ethertype = clib_net_to_host_u16 (vlan->type);
+ l2hdr_sz += sizeof (*vlan);
+ if (ethertype == ETHERNET_TYPE_VLAN)
+ {
+ vlan++;
+ ethertype = clib_net_to_host_u16 (vlan->type);
+ l2hdr_sz += sizeof (*vlan);
+ }
+ }
+
+ gho.l2_hdr_offset = b0->current_data;
+ gho.l3_hdr_offset = l2hdr_sz;
+
+ if (PREDICT_TRUE (is_ip6 == 0))
+ {
+ ip4_header_t *ip4 =
+ (ip4_header_t *) (vlib_buffer_get_current (b0) + l2hdr_sz);
+ gho.l4_hdr_offset = l2hdr_sz + ip4_header_bytes (ip4);
+ l4_proto = ip4->protocol;
+ }
+ else if (PREDICT_TRUE (is_ip6))
+ {
+ ip6_header_t *ip6 =
+ (ip6_header_t *) (vlib_buffer_get_current (b0) + l2hdr_sz);
+ /* FIXME IPv6 EH traversal */
+ gho.l4_hdr_offset = l2hdr_sz + sizeof (ip6_header_t);
+ l4_proto = ip6->protocol;
+ }
+ if (l4_proto == IP_PROTOCOL_TCP)
+ {
+ tcp_header_t *tcp = (tcp_header_t *) (vlib_buffer_get_current (b0) +
+ gho.l4_hdr_offset);
+ l4_hdr_sz = tcp_header_bytes (tcp);
+ tcp->checksum = 0;
+ }
+ else if (l4_proto == IP_PROTOCOL_UDP)
+ {
+ udp_header_t *udp = (udp_header_t *) (vlib_buffer_get_current (b0) +
+ gho.l4_hdr_offset);
+ l4_hdr_sz = sizeof (*udp);
+ udp->checksum = 0;
+ }
+
+ if (b0->flags & (VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_IS_IP6))
+ {
+ gho.l4_hdr_sz = l4_hdr_sz;
+ }
+
+ return gho;
+}
+
#endif /* included_gso_h */
/*