gso: add vxlan tunnel support

Type: feature

Change-Id: I85f6ec77187a4983c66c5e22fd39fbb2cef82902
Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>

1 files changed, 408 insertions, 0 deletions

diff --git a/src/vnet/gso/hdr_offset_parser.h b/src/vnet/gso/hdr_offset_parser.h
new file mode 100644
index 00000000000..8f9e0cda984
--- /dev/null
+++ b/src/vnet/gso/hdr_offset_parser.h
@@ -0,0 +1,408 @@
+/*
+ * Copyright (c) 2019 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef included_hdr_offset_parser_h
+#define included_hdr_offset_parser_h
+
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/ip/ip4_packet.h>
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/udp/udp.h>
+#include <vnet/udp/udp_packet.h>
+#include <vnet/vnet.h>
+#include <vnet/vxlan/vxlan_packet.h>
+
+#define foreach_gho_flag        \
+  _( 0, IP4)                    \
+  _( 1, IP6)                    \
+  _( 2, TCP)                    \
+  _( 3, UDP)                    \
+  _( 4, OUTER_IP4)              \
+  _( 5, OUTER_IP6)              \
+  _( 6, OUTER_TCP)              \
+  _( 7, OUTER_UDP)              \
+  _( 8, VXLAN_TUNNEL)           \
+  _( 9, GRE_TUNNEL)             \
+  _( 10, IPIP_TUNNEL)           \
+  _( 11, GENEVE_TUNNEL)
+
+typedef enum gho_flag_t_
+{
+#define _(bit, name) GHO_F_##name  = (1 << bit),
+  foreach_gho_flag
+#undef _
+} gho_flag_t;
+
+#define GHO_F_TUNNEL (GHO_F_VXLAN_TUNNEL |  \
+                      GHO_F_GENEVE_TUNNEL | \
+                      GHO_F_IPIP_TUNNEL |   \
+                      GHO_F_GRE_TUNNEL)
+
+#define GHO_F_OUTER_HDR (GHO_F_OUTER_IP4 | \
+                         GHO_F_OUTER_IP6 | \
+                         GHO_F_OUTER_TCP | \
+                         GHO_F_OUTER_UDP)
+
+#define GHO_F_INNER_HDR (GHO_F_IP4 | \
+                         GHO_F_IP6 | \
+                         GHO_F_UDP | \
+                         GHO_F_TCP)
+
+typedef struct
+{
+  i16 outer_l2_hdr_offset;
+  i16 outer_l3_hdr_offset;
+  i16 outer_l4_hdr_offset;
+  u16 outer_l4_hdr_sz;
+  u16 outer_hdr_sz;
+  i16 l2_hdr_offset;
+  i16 l3_hdr_offset;
+  i16 l4_hdr_offset;
+  u16 l4_hdr_sz;
+  u16 hdr_sz;
+  gho_flag_t gho_flags;
+} generic_header_offset_t;
+
+static_always_inline u8 *
+format_generic_header_offset (u8 * s, va_list * args)
+{
+  generic_header_offset_t *gho = va_arg (*args, generic_header_offset_t *);
+
+  s = format (s, "\n\t");
+  if (gho->gho_flags & GHO_F_TUNNEL)
+    {
+      if (gho->gho_flags & GHO_F_VXLAN_TUNNEL)
+	s = format (s, "vxlan-tunnel ");
+      else if (gho->gho_flags & GHO_F_IPIP_TUNNEL)
+	s = format (s, "ipip-tunnel ");
+      else if (gho->gho_flags & GHO_F_GRE_TUNNEL)
+	s = format (s, "gre-tunnel ");
+      else if (gho->gho_flags & GHO_F_GENEVE_TUNNEL)
+	s = format (s, "geneve-tunnel ");
+
+      if (gho->gho_flags & GHO_F_OUTER_IP4)
+	s = format (s, "outer-ipv4 ");
+      else if (gho->gho_flags & GHO_F_OUTER_IP6)
+	s = format (s, "outer-ipv6 ");
+
+      if (gho->gho_flags & GHO_F_OUTER_UDP)
+	s = format (s, "outer-udp ");
+      else if (gho->gho_flags & GHO_F_OUTER_TCP)
+	s = format (s, "outer-tcp ");
+
+      s = format (s, "outer-hdr-sz %u outer-l2-hdr-offset %d "
+		  "outer-l3-hdr-offset %d outer-l4-hdr-offset %d "
+		  "outer-l4-hdr-sz %u\n\t",
+		  gho->outer_hdr_sz, gho->outer_l2_hdr_offset,
+		  gho->outer_l3_hdr_offset, gho->outer_l4_hdr_offset,
+		  gho->outer_l4_hdr_sz);
+    }
+
+  if (gho->gho_flags & GHO_F_IP4)
+    s = format (s, "ipv4 ");
+  else if (gho->gho_flags & GHO_F_IP6)
+    s = format (s, "ipv6 ");
+
+  if (gho->gho_flags & GHO_F_TCP)
+    s = format (s, "tcp ");
+  else if (gho->gho_flags & GHO_F_UDP)
+    s = format (s, "udp ");
+
+  s = format (s, "hdr-sz %u l2-hdr-offset %d "
+	      "l3-hdr-offset %d l4-hdr-offset %d "
+	      "l4-hdr-sz %u",
+	      gho->hdr_sz, gho->l2_hdr_offset, gho->l3_hdr_offset,
+	      gho->l4_hdr_offset, gho->l4_hdr_sz);
+
+  return s;
+}
+
+static_always_inline void
+vnet_get_inner_header (vlib_buffer_t * b0, generic_header_offset_t * gho)
+{
+  if ((gho->gho_flags & GHO_F_TUNNEL)
+      && (gho->gho_flags & GHO_F_OUTER_HDR)
+      && (b0->current_data == gho->outer_l2_hdr_offset))
+    vlib_buffer_advance (b0, gho->outer_hdr_sz);
+}
+
+static_always_inline void
+vnet_get_outer_header (vlib_buffer_t * b0, generic_header_offset_t * gho)
+{
+  if ((gho->gho_flags & GHO_F_TUNNEL)
+      && (gho->gho_flags & GHO_F_OUTER_HDR)
+      && (b0->current_data == gho->l2_hdr_offset))
+    vlib_buffer_advance (b0, -gho->outer_hdr_sz);
+}
+
+static_always_inline void
+vnet_geneve_inner_header_parser_inline (vlib_buffer_t * b0,
+					generic_header_offset_t * gho)
+{
+  /* not supported yet */
+  if ((gho->gho_flags & GHO_F_GENEVE_TUNNEL) == 0)
+    return;
+
+  ASSERT (0);
+}
+
+static_always_inline void
+vnet_gre_inner_header_parser_inline (vlib_buffer_t * b0,
+				     generic_header_offset_t * gho)
+{
+  /* not supported yet */
+  if ((gho->gho_flags & GHO_F_GRE_TUNNEL) == 0)
+    return;
+
+  ASSERT (0);
+}
+
+static_always_inline void
+vnet_ipip_inner_header_parser_inline (vlib_buffer_t * b0,
+				      generic_header_offset_t * gho)
+{
+  /* not supported yet */
+  if ((gho->gho_flags & GHO_F_IPIP_TUNNEL) == 0)
+    return;
+
+  ASSERT (0);
+}
+
+static_always_inline void
+vnet_vxlan_inner_header_parser_inline (vlib_buffer_t * b0,
+				       generic_header_offset_t * gho)
+{
+  u8 l4_proto = 0;
+  u8 l4_hdr_sz = 0;
+
+  if ((gho->gho_flags & GHO_F_VXLAN_TUNNEL) == 0)
+    return;
+
+  gho->outer_l2_hdr_offset = gho->l2_hdr_offset;
+  gho->outer_l3_hdr_offset = gho->l3_hdr_offset;
+  gho->outer_l4_hdr_offset = gho->l4_hdr_offset;
+  gho->outer_l4_hdr_sz = gho->l4_hdr_sz;
+  gho->outer_hdr_sz = gho->hdr_sz;
+
+  gho->l2_hdr_offset = 0;
+  gho->l3_hdr_offset = 0;
+  gho->l4_hdr_offset = 0;
+  gho->l4_hdr_sz = 0;
+  gho->hdr_sz = 0;
+
+  if (gho->gho_flags & GHO_F_IP4)
+    {
+      gho->gho_flags |= GHO_F_OUTER_IP4;
+    }
+  else if (gho->gho_flags & GHO_F_IP6)
+    {
+      gho->gho_flags |= GHO_F_OUTER_IP6;
+    }
+
+  if (gho->gho_flags & GHO_F_UDP)
+    {
+      gho->gho_flags |= GHO_F_OUTER_UDP;
+    }
+
+  gho->gho_flags &= ~GHO_F_INNER_HDR;
+
+  vnet_get_inner_header (b0, gho);
+
+  gho->l2_hdr_offset = b0->current_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);
+
+  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->l3_hdr_offset = l2hdr_sz;
+
+  if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP4))
+    {
+      ip4_header_t *ip4 =
+	(ip4_header_t *) (vlib_buffer_get_current (b0) + gho->l3_hdr_offset);
+      gho->l4_hdr_offset = gho->l3_hdr_offset + ip4_header_bytes (ip4);
+      l4_proto = ip4->protocol;
+      gho->gho_flags |= GHO_F_IP4;
+    }
+  else if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP6))
+    {
+      ip6_header_t *ip6 =
+	(ip6_header_t *) (vlib_buffer_get_current (b0) + gho->l3_hdr_offset);
+      /* FIXME IPv6 EH traversal */
+      gho->l4_hdr_offset = gho->l3_hdr_offset + sizeof (ip6_header_t);
+      l4_proto = ip6->protocol;
+      gho->gho_flags |= GHO_F_IP6;
+    }
+  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);
+
+      gho->gho_flags |= GHO_F_TCP;
+
+    }
+  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);
+
+      gho->gho_flags |= GHO_F_UDP;
+    }
+
+  gho->l4_hdr_sz = l4_hdr_sz;
+  gho->hdr_sz += gho->l4_hdr_offset + l4_hdr_sz;
+
+  vnet_get_outer_header (b0, gho);
+}
+
+static_always_inline void
+vnet_generic_inner_header_parser_inline (vlib_buffer_t * b0,
+					 generic_header_offset_t * gho)
+{
+
+  if (gho->gho_flags & GHO_F_VXLAN_TUNNEL)
+    vnet_vxlan_inner_header_parser_inline (b0, gho);
+  else if (gho->gho_flags & GHO_F_IPIP_TUNNEL)
+    vnet_ipip_inner_header_parser_inline (b0, gho);
+  else if (gho->gho_flags & GHO_F_GRE_TUNNEL)
+    vnet_gre_inner_header_parser_inline (b0, gho);
+  else if (gho->gho_flags & GHO_F_GENEVE_TUNNEL)
+    vnet_geneve_inner_header_parser_inline (b0, gho);
+}
+
+static_always_inline void
+vnet_generic_outer_header_parser_inline (vlib_buffer_t * b0,
+					 generic_header_offset_t * gho)
+{
+  u8 l4_proto = 0;
+  u8 l4_hdr_sz = 0;
+
+  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 (ethertype == ETHERNET_TYPE_IP4))
+    {
+      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;
+      gho->gho_flags |= GHO_F_IP4;
+    }
+  else if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_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;
+      gho->gho_flags |= GHO_F_IP6;
+    }
+  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);
+
+      gho->gho_flags |= GHO_F_TCP;
+    }
+  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);
+
+      gho->gho_flags |= GHO_F_UDP;
+
+      if (UDP_DST_PORT_vxlan == clib_net_to_host_u16 (udp->dst_port))
+	{
+	  gho->gho_flags |= GHO_F_VXLAN_TUNNEL;
+	  gho->hdr_sz += sizeof (vxlan_header_t);
+	}
+      else if (UDP_DST_PORT_geneve == clib_net_to_host_u16 (udp->dst_port))
+	{
+	  gho->gho_flags |= GHO_F_GENEVE_TUNNEL;
+	}
+    }
+  else if ((l4_proto == IP_PROTOCOL_IP_IN_IP)
+	   || (l4_proto == IP_PROTOCOL_IPV6))
+    {
+      l4_hdr_sz = 0;
+      gho->gho_flags |= GHO_F_IPIP_TUNNEL;
+    }
+  else if (l4_proto == IP_PROTOCOL_GRE)
+    {
+      l4_hdr_sz = 0;
+      gho->gho_flags |= GHO_F_GRE_TUNNEL;
+    }
+
+  gho->l4_hdr_sz = l4_hdr_sz;
+  gho->hdr_sz += gho->l4_hdr_offset + l4_hdr_sz;
+}
+
+static_always_inline void
+vnet_generic_header_offset_parser (vlib_buffer_t * b0,
+				   generic_header_offset_t * gho)
+{
+  vnet_generic_outer_header_parser_inline (b0, gho);
+
+  if (gho->gho_flags & GHO_F_TUNNEL)
+    {
+      vnet_generic_inner_header_parser_inline (b0, gho);
+    }
+}
+
+#endif /* included_hdr_offset_parser_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */