gso: fix l3 and l4 header offset in case of tagged interface
previously, PG and virtio interfaces calculate wrong l3 and l4
header offset. This patch fixes this issue.
Type: fix
Ticket: VPP-1739
Change-Id: I5ba978e464babeb65e0711e1027320d46b3b9932
Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>
diff --git a/src/vnet/devices/virtio/node.c b/src/vnet/devices/virtio/node.c
index 9cb6cca..3b218ab 100644
--- a/src/vnet/devices/virtio/node.c
+++ b/src/vnet/devices/virtio/node.c
@@ -153,6 +153,20 @@
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);
+ }
+ }
+
vnet_buffer (b0)->l2_hdr_offset = 0;
vnet_buffer (b0)->l3_hdr_offset = l2hdr_sz;
if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP4))