[SAIP4] Introduce new unsupported tunnel_decap action. (sonic-net#641)

Co-authored-by: kishanps <[email protected]> Co-authored-by: rhalstea <[email protected]> Co-authored-by: smolkaj <[email protected]>
divyagayathri-hcl · Oct 21, 2024 · e39edad · e39edad
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commit e39edad
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Showing 12 changed files with 184 additions and 213 deletions.
diff --git a/sai_p4/fixed/ids.h b/sai_p4/fixed/ids.h
@@ -56,18 +56,18 @@
 #define MIRRORING_MIRROR_AS_IPV4_ERSPAN_ACTION_ID 0x01000007         // 16777223
 #define CLONING_INGRESS_CLONE_ACTION_ID 0x0100001C                 // 16777244
 #define CLONING_MIRROR_WITH_VLAN_TAG_AND_IPFIX_ENCAPSULATION_ACTION_ID \
-  0x0100001D                                                    // 16777245
-#define L3_ADMIT_ACTION_ID 0x01000008                                // 16777224
-#define MIRRORING_SET_PRE_SESSION_ACTION_ID 0x01000009               // 16777225
-#define SELECT_ECMP_HASH_ALGORITHM_ACTION_ID 0x010000A               // 16777226
-#define COMPUTE_ECMP_HASH_IPV4_ACTION_ID 0x0100000B                  // 16777227
-#define COMPUTE_ECMP_HASH_IPV6_ACTION_ID 0x0100000C                  // 16777228
-#define COMPUTE_LAG_HASH_IPV4_ACTION_ID 0x0100000D                   // 16777229
-#define COMPUTE_LAG_HASH_IPV6_ACTION_ID 0x0100000E                   // 16777230
-#define ROUTING_SET_METADATA_AND_DROP_ACTION_ID 0x01000015           // 16777237
-#define MARK_FOR_TUNNEL_DECAP_AND_SET_VRF_ACTION_ID 0x01000016       // 16777238
-#define DISABLE_VLAN_CHECKS_ACTION_ID 0x0100001A                   // 16777242
-// Next available action id: 0x0100001E (16777246)
+  0x0100001D                                                // 16777245
+#define L3_ADMIT_ACTION_ID 0x01000008                       // 16777224
+#define MIRRORING_SET_PRE_SESSION_ACTION_ID 0x01000009      // 16777225
+#define SELECT_ECMP_HASH_ALGORITHM_ACTION_ID 0x010000A      // 16777226
+#define COMPUTE_ECMP_HASH_IPV4_ACTION_ID 0x0100000B         // 16777227
+#define COMPUTE_ECMP_HASH_IPV6_ACTION_ID 0x0100000C         // 16777228
+#define COMPUTE_LAG_HASH_IPV4_ACTION_ID 0x0100000D          // 16777229
+#define COMPUTE_LAG_HASH_IPV6_ACTION_ID 0x0100000E          // 16777230
+#define ROUTING_SET_METADATA_AND_DROP_ACTION_ID 0x01000015  // 16777237
+#define TUNNEL_DECAP_ACTION_ID 0x01000016                   // 16777238
+#define DISABLE_VLAN_CHECKS_ACTION_ID 0x0100001A            // 16777242
+// Next available action id: 0x0100001F (16777247)
 
 // --- Action Profiles and Selectors (8 most significant bits = 0x11) ----------
 // This value should ideally be 0x11000001, but we currently have this value for

diff --git a/sai_p4/fixed/tunnel_termination.p4 b/sai_p4/fixed/tunnel_termination.p4
@@ -17,16 +17,23 @@
 #ifndef SAI_TUNNEL_TERMINATION_P4_
 #define SAI_TUNNEL_TERMINATION_P4_
 
-// Should be applied at the beginning of the pre-ingress stage.
-control tunnel_termination_lookup(in headers_t headers,
+#include <v1model.p4>
+#include "headers.p4"
+#include "metadata.p4"
+#include "ids.h"
+#include "minimum_guaranteed_sizes.p4"
+
+// Should be applied at the end of the pre-ingress stage.
+control tunnel_termination(inout headers_t headers,
                                   inout local_metadata_t local_metadata) {
+  bool marked_for_ip_in_ipv6_decap = false;
 
-  // Sets SAI_TUNNEL_TERM_TABLE_ENTRY_ATTR_VR_ID.
-  @id(MARK_FOR_TUNNEL_DECAP_AND_SET_VRF_ACTION_ID)
-  action mark_for_tunnel_decap_and_set_vrf(vrf_id_t vrf_id) {
-    // Actual decap is delayed until the end of the pre-ingress stage.
-    local_metadata.apply_tunnel_decap_at_end_of_pre_ingress = true;
-    local_metadata.vrf_id = vrf_id;
+  @id(TUNNEL_DECAP_ACTION_ID)
+  @unsupported
+  action tunnel_decap() {
+    // Bmv2 does not support if statements in actions, so control metadata is 
+    // set and decapping is performed post-action.
+    marked_for_ip_in_ipv6_decap = true;
   }
 
   // Models SAI_TUNNEL_TERM_TABLE.
@@ -36,6 +43,7 @@ control tunnel_termination_lookup(in headers_t headers,
   @unsupported
   @p4runtime_role(P4RUNTIME_ROLE_ROUTING)
   @id(IPV6_TUNNEL_TERMINATION_TABLE_ID)
+  @unsupported
   table ipv6_tunnel_termination_table {
     key = {
       // Sets `SAI_TUNNEL_TERM_TABLE_ENTRY_ATTR_DST_IP[_MASK]`.
@@ -46,7 +54,7 @@ control tunnel_termination_lookup(in headers_t headers,
         @id(2) @name("src_ipv6") @format(IPV6_ADDRESS);
     }
     actions = {
-      @proto_id(1) mark_for_tunnel_decap_and_set_vrf;
+      @proto_id(1) tunnel_decap;
     }
     size = IPV6_TUNNEL_TERMINATION_TABLE_MINIMUM_GUARANTEED_SIZE;
   }
@@ -61,15 +69,8 @@ control tunnel_termination_lookup(in headers_t headers,
         ipv6_tunnel_termination_table.apply();
       }
     }
-  }
 
-}
-
-// Should be applied at the end of the pre-ingress stage.
-control tunnel_termination_decap(inout headers_t headers,
-                                 in local_metadata_t local_metadata) {
-  apply {
-    if (local_metadata.apply_tunnel_decap_at_end_of_pre_ingress) {
+    if (marked_for_ip_in_ipv6_decap) {
       // Currently, this should only ever be set for IP-in-IPv6 packets.
       // TODO: Remove guard once p4-symbolic suports assertions.
 #ifndef PLATFORM_P4SYMBOLIC

diff --git a/sai_p4/instantiations/google/fabric_border_router.p4 b/sai_p4/instantiations/google/fabric_border_router.p4
@@ -33,11 +33,10 @@ control ingress(inout headers_t headers,
   apply {
     packet_out_decap.apply(headers, local_metadata, standard_metadata);
     if (!local_metadata.bypass_ingress) {
-      tunnel_termination_lookup.apply(headers, local_metadata);
       vlan_untag.apply(headers, local_metadata, standard_metadata);
       acl_pre_ingress.apply(headers, local_metadata, standard_metadata);
       ingress_vlan_checks.apply(headers, local_metadata, standard_metadata);
-      tunnel_termination_decap.apply(headers, local_metadata);
+      tunnel_termination.apply(headers, local_metadata);
       admit_google_system_mac.apply(headers, local_metadata);
       l3_admit.apply(headers, local_metadata, standard_metadata);
       routing_lookup.apply(headers, local_metadata, standard_metadata);

diff --git a/sai_p4/instantiations/google/fabric_border_router.p4info.pb.txt b/sai_p4/instantiations/google/fabric_border_router.p4info.pb.txt
@@ -4,39 +4,6 @@ pkg_info {
   arch: "v1model"
   organization: "Google"
 }
-tables {
-  preamble {
-    id: 33554507
-    name: "ingress.tunnel_termination_lookup.ipv6_tunnel_termination_table"
-    alias: "ipv6_tunnel_termination_table"
-    annotations: "@unsupported"
-    annotations: "@p4runtime_role(\"sdn_controller\")"
-  }
-  match_fields {
-    id: 1
-    name: "dst_ipv6"
-    annotations: "@format(IPV6_ADDRESS)"
-    bitwidth: 128
-    match_type: TERNARY
-  }
-  match_fields {
-    id: 2
-    name: "src_ipv6"
-    annotations: "@format(IPV6_ADDRESS)"
-    bitwidth: 128
-    match_type: TERNARY
-  }
-  action_refs {
-    id: 16777238
-    annotations: "@proto_id(1)"
-  }
-  action_refs {
-    id: 21257015
-    annotations: "@defaultonly"
-    scope: DEFAULT_ONLY
-  }
-  size: 126
-}
 tables {
   preamble {
     id: 33554509
@@ -161,6 +128,40 @@ tables {
   direct_resource_ids: 318767361
   size: 254
 }
+tables {
+  preamble {
+    id: 33554507
+    name: "ingress.tunnel_termination.ipv6_tunnel_termination_table"
+    alias: "ipv6_tunnel_termination_table"
+    annotations: "@unsupported"
+    annotations: "@p4runtime_role(\"sdn_controller\")"
+    annotations: "@unsupported"
+  }
+  match_fields {
+    id: 1
+    name: "dst_ipv6"
+    annotations: "@format(IPV6_ADDRESS)"
+    bitwidth: 128
+    match_type: TERNARY
+  }
+  match_fields {
+    id: 2
+    name: "src_ipv6"
+    annotations: "@format(IPV6_ADDRESS)"
+    bitwidth: 128
+    match_type: TERNARY
+  }
+  action_refs {
+    id: 16777238
+    annotations: "@proto_id(1)"
+  }
+  action_refs {
+    id: 21257015
+    annotations: "@defaultonly"
+    scope: DEFAULT_ONLY
+  }
+  size: 126
+}
 tables {
   preamble {
     id: 33554503
@@ -1125,20 +1126,6 @@ actions {
     annotations: "@sai_action(SAI_PACKET_ACTION_DROP)"
   }
 }
-actions {
-  preamble {
-    id: 16777238
-    name: "ingress.tunnel_termination_lookup.mark_for_tunnel_decap_and_set_vrf"
-    alias: "mark_for_tunnel_decap_and_set_vrf"
-  }
-  params {
-    id: 1
-    name: "vrf_id"
-    type_name {
-      name: "vrf_id_t"
-    }
-  }
-}
 actions {
   preamble {
     id: 16777242
@@ -1163,6 +1150,14 @@ actions {
     }
   }
 }
+actions {
+  preamble {
+    id: 16777238
+    name: "ingress.tunnel_termination.tunnel_decap"
+    alias: "tunnel_decap"
+    annotations: "@unsupported"
+  }
+}
 actions {
   preamble {
     id: 16777224

diff --git a/sai_p4/instantiations/google/middleblock.p4 b/sai_p4/instantiations/google/middleblock.p4
@@ -34,11 +34,10 @@ control ingress(inout headers_t headers,
   apply {
     packet_out_decap.apply(headers, local_metadata, standard_metadata);
     if (!local_metadata.bypass_ingress) {
-      tunnel_termination_lookup.apply(headers, local_metadata);
       vlan_untag.apply(headers, local_metadata, standard_metadata);
       acl_pre_ingress.apply(headers, local_metadata, standard_metadata);
       ingress_vlan_checks.apply(headers, local_metadata, standard_metadata);
-      tunnel_termination_decap.apply(headers, local_metadata);
+      tunnel_termination.apply(headers, local_metadata);
       admit_google_system_mac.apply(headers, local_metadata);
       l3_admit.apply(headers, local_metadata, standard_metadata);
       routing_lookup.apply(headers, local_metadata, standard_metadata);

diff --git a/sai_p4/instantiations/google/middleblock.p4info.pb.txt b/sai_p4/instantiations/google/middleblock.p4info.pb.txt
@@ -4,39 +4,6 @@ pkg_info {
   arch: "v1model"
   organization: "Google"
 }
-tables {
-  preamble {
-    id: 33554507
-    name: "ingress.tunnel_termination_lookup.ipv6_tunnel_termination_table"
-    alias: "ipv6_tunnel_termination_table"
-    annotations: "@unsupported"
-    annotations: "@p4runtime_role(\"sdn_controller\")"
-  }
-  match_fields {
-    id: 1
-    name: "dst_ipv6"
-    annotations: "@format(IPV6_ADDRESS)"
-    bitwidth: 128
-    match_type: TERNARY
-  }
-  match_fields {
-    id: 2
-    name: "src_ipv6"
-    annotations: "@format(IPV6_ADDRESS)"
-    bitwidth: 128
-    match_type: TERNARY
-  }
-  action_refs {
-    id: 16777238
-    annotations: "@proto_id(1)"
-  }
-  action_refs {
-    id: 21257015
-    annotations: "@defaultonly"
-    scope: DEFAULT_ONLY
-  }
-  size: 126
-}
 tables {
   preamble {
     id: 33554509
@@ -153,6 +120,40 @@ tables {
   direct_resource_ids: 318767361
   size: 254
 }
+tables {
+  preamble {
+    id: 33554507
+    name: "ingress.tunnel_termination.ipv6_tunnel_termination_table"
+    alias: "ipv6_tunnel_termination_table"
+    annotations: "@unsupported"
+    annotations: "@p4runtime_role(\"sdn_controller\")"
+    annotations: "@unsupported"
+  }
+  match_fields {
+    id: 1
+    name: "dst_ipv6"
+    annotations: "@format(IPV6_ADDRESS)"
+    bitwidth: 128
+    match_type: TERNARY
+  }
+  match_fields {
+    id: 2
+    name: "src_ipv6"
+    annotations: "@format(IPV6_ADDRESS)"
+    bitwidth: 128
+    match_type: TERNARY
+  }
+  action_refs {
+    id: 16777238
+    annotations: "@proto_id(1)"
+  }
+  action_refs {
+    id: 21257015
+    annotations: "@defaultonly"
+    scope: DEFAULT_ONLY
+  }
+  size: 126
+}
 tables {
   preamble {
     id: 33554503
@@ -1080,20 +1081,6 @@ actions {
     annotations: "@sai_action(SAI_PACKET_ACTION_DROP)"
   }
 }
-actions {
-  preamble {
-    id: 16777238
-    name: "ingress.tunnel_termination_lookup.mark_for_tunnel_decap_and_set_vrf"
-    alias: "mark_for_tunnel_decap_and_set_vrf"
-  }
-  params {
-    id: 1
-    name: "vrf_id"
-    type_name {
-      name: "vrf_id_t"
-    }
-  }
-}
 actions {
   preamble {
     id: 16777242
@@ -1118,6 +1105,14 @@ actions {
     }
   }
 }
+actions {
+  preamble {
+    id: 16777238
+    name: "ingress.tunnel_termination.tunnel_decap"
+    alias: "tunnel_decap"
+    annotations: "@unsupported"
+  }
+}
 actions {
   preamble {
     id: 16777224

diff --git a/sai_p4/instantiations/google/sai_pd.proto b/sai_p4/instantiations/google/sai_pd.proto
@@ -210,7 +210,8 @@ message Ipv6TunnelTerminationTableEntry {
   }
   Match match = 1;
   message Action {
-    MarkForTunnelDecapAndSetVrfAction mark_for_tunnel_decap_and_set_vrf = 1;
+    // CAUTION: This action is not (yet) supported.
+    TunnelDecapAction tunnel_decap = 1;
   }
   Action action = 2;
   int32 priority = 3;
@@ -858,9 +859,8 @@ message SetMetadataAndDropAction {
   string route_metadata = 1;  // Format::HEX_STRING / 6 bits
 }
 
-message MarkForTunnelDecapAndSetVrfAction {
-  string vrf_id = 1;  // Format::STRING
-}
+// CAUTION: This action is not (yet) supported.
+message TunnelDecapAction {}
 
 message SetIpNexthopAndDisableRewritesAction {
   // Refers to 'router_interface_table.router_interface_id'.