Continuing the implementation of initial entries support in p4c (#4080)

* Continuing the implementation of initial entries support in p4c
These changes update the contents of P4Info and table entries files as
generated by p4c, to match what has been agreed upon by the P4 API
work group in this pull request
p4lang/p4runtime#432

* Comment-only change to poke CI.

* Update p4runtime commit SHA

* Update p4runtime commit SHA for Bazel builds

* Correctly handle case when table->getEntries() is null

* Update a few more expected output files, and make linter happy

* Update bazel/p4c_deps.bzl

Co-authored-by: Radostin Stoyanov <rstoyanov@fedoraproject.org>

---------

Co-authored-by: Radostin Stoyanov <rstoyanov@fedoraproject.org>

CMakeLists.txt

@@ -383,7 +383,7 @@ set(FETCHCONTENT_QUIET OFF)
 FetchContent_Declare(
   p4runtime
   GIT_REPOSITORY https://github.com/p4lang/p4runtime.git
-  GIT_TAG        d76a3640a223f47a43dc34e5565b72e43796ba57
+  GIT_TAG        1e771c4e05c4e7e250df00212b3ca02ee3202d71
   GIT_PROGRESS TRUE
 )
 FetchContent_MakeAvailable(p4runtime)

bazel/p4c_deps.bzl

@@ -43,8 +43,8 @@ filegroup(
         git_repository(
             name = "com_github_p4lang_p4runtime",
             remote = "https://github.com/p4lang/p4runtime",
-            # Newest commit on main branch as of April 11, 2023.
-            commit = "d76a3640a223f47a43dc34e5565b72e43796ba57",
+            # Newest commit on main branch as of August 11, 2023.
+            commit = "1e771c4e05c4e7e250df00212b3ca02ee3202d71",
             shallow_since = "1680213111 -0700",
             # strip_prefix is broken; we use patch_cmds as a workaround,
             # see https://github.com/bazelbuild/bazel/issues/10062.

control-plane/p4RuntimeSerializer.cpp

@@ -297,6 +297,15 @@ static bool getConstTable(const IR::P4Table *table) {
     return ep->isConstant;
 }
 
+/// @return true if @table has an 'entries' or 'const entries'
+/// property, and there is at least one entry.
+static bool getHasInitialEntries(const IR::P4Table *table) {
+    BUG_CHECK(table != nullptr, "Failed precondition for getHasInitialEntries");
+    auto entriesList = table->getEntries();
+    if (entriesList == nullptr) return false;
+    return (entriesList->entries.size() >= 1);
+}
+
 static std::vector<ActionRef> getActionRefs(const IR::P4Table *table, ReferenceMap *refMap) {
     std::vector<ActionRef> actions;
     for (auto action : table->getActionList()->actionList) {
@@ -655,6 +664,7 @@ class P4RuntimeAnalyzer {
         auto actions = getActionRefs(tableDeclaration, refMap);
 
         bool isConstTable = getConstTable(tableDeclaration);
+        bool hasInitialEntries = getHasInitialEntries(tableDeclaration);
 
         auto name = archHandler->getControlPlaneName(tableBlock);
         auto annotations = tableDeclaration->to<IR::IAnnotated>();
@@ -712,6 +722,9 @@ class P4RuntimeAnalyzer {
         if (isConstTable) {
             table->set_is_const_table(true);
         }
+        if (hasInitialEntries) {
+            table->set_has_initial_entries(true);
+        }
 
         archHandler->addTableProperties(symbols, p4Info, table, tableBlock);
     }
@@ -973,9 +986,9 @@ static void analyzeParser(P4RuntimeAnalyzer &analyzer, const IR::ParserBlock *pa
     }
 }
 
-/// A converter which translates the 'const entries' for P4 tables (if any)
-/// into a P4Runtime WriteRequest message which can be used by a target to
-/// initialize its tables.
+/// A converter which translates the 'entries' or 'const entries' for
+/// P4 tables (if any) into a P4Runtime WriteRequest message which can
+/// be used by a target to initialize its tables.
 class P4RuntimeEntriesConverter {
  private:
     friend class P4RuntimeAnalyzer;
@@ -1012,6 +1025,7 @@ class P4RuntimeEntriesConverter {
             protoEntry->set_table_id(tableId);
             addMatchKey(protoEntry, table, e->getKeys(), refMap, typeMap);
             addAction(protoEntry, e->getAction(), refMap, typeMap);
+            protoEntry->set_is_const(isConst || e->isConst);
             if (needsPriority) {
                 if (!isConst) {
                     // The entry has a priority, use it.

testdata/p4_16_errors_outputs/table-entries-lpm-2.p4.entries.txt

@@ -19,6 +19,7 @@ updates {
           }
         }
       }
+      is_const: true
     }
   }
 }
@@ -43,6 +44,7 @@ updates {
           }
         }
       }
+      is_const: true
     }
   }
 }
@@ -60,6 +62,7 @@ updates {
           }
         }
       }
+      is_const: true
     }
   }
 }
@@ -77,6 +80,7 @@ updates {
           }
         }
       }
+      is_const: true
     }
   }
 }
@@ -101,6 +105,7 @@ updates {
           }
         }
       }
+      is_const: true
     }
   }
 }

testdata/p4_16_errors_outputs/table-entries-lpm-2.p4.p4info.txt

@@ -21,6 +21,7 @@ tables {
   }
   size: 1024
   is_const_table: true
+  has_initial_entries: true
 }
 actions {
   preamble {

testdata/p4_16_errors_outputs/table-entries-optional-2-bmv2.p4.entries.txt

@@ -24,6 +24,7 @@ updates {
         }
       }
       priority: 3
+      is_const: true
     }
   }
 }
@@ -48,6 +49,7 @@ updates {
         }
       }
       priority: 2
+      is_const: true
     }
   }
 }
@@ -72,6 +74,7 @@ updates {
         }
       }
       priority: 1
+      is_const: true
     }
   }
 }

testdata/p4_16_errors_outputs/table-entries-optional-2-bmv2.p4.p4info.txt

@@ -27,6 +27,7 @@ tables {
   }
   size: 1024
   is_const_table: true
+  has_initial_entries: true
 }
 actions {
   preamble {

testdata/p4_16_samples_outputs/action-two-params.p4.entries.txt

@@ -22,6 +22,7 @@ updates {
           }
         }
       }
+      is_const: true
     }
   }
 }

testdata/p4_16_samples_outputs/action-two-params.p4.p4info.txt

@@ -22,6 +22,7 @@ tables {
   const_default_action_id: 25652968
   size: 1024
   is_const_table: true
+  has_initial_entries: true
 }
 actions {
   preamble {

testdata/p4_16_samples_outputs/bvec-hdr-bmv2.p4.entries.txt

@@ -18,6 +18,7 @@ updates {
           }
         }
       }
+      is_const: true
     }
   }
 }
@@ -41,6 +42,7 @@ updates {
           }
         }
       }
+      is_const: true
     }
   }
 }

testdata/p4_16_samples_outputs/bvec-hdr-bmv2.p4.p4info.txt

@@ -21,6 +21,7 @@ tables {
   }
   size: 1024
   is_const_table: true
+  has_initial_entries: true
 }
 actions {
   preamble {

testdata/p4_16_samples_outputs/checksum-l4-bmv2.p4.entries.txt

@@ -14,6 +14,7 @@ updates {
           action_id: 25440736
         }
       }
+      is_const: true
     }
   }
 }
@@ -33,6 +34,7 @@ updates {
           action_id: 18556685
         }
       }
+      is_const: true
     }
   }
 }

testdata/p4_16_samples_outputs/checksum-l4-bmv2.p4.p4info.txt

@@ -22,6 +22,7 @@ tables {
   const_default_action_id: 21257015
   size: 1024
   is_const_table: true
+  has_initial_entries: true
 }
 tables {
   preamble {
@@ -44,6 +45,7 @@ tables {
   const_default_action_id: 21257015
   size: 1024
   is_const_table: true
+  has_initial_entries: true
 }
 actions {
   preamble {

testdata/p4_16_samples_outputs/crc32-bmv2.p4.entries.txt

@@ -14,6 +14,7 @@ updates {
           action_id: 24785092
         }
       }
+      is_const: true
     }
   }
 }
@@ -33,6 +34,7 @@ updates {
           action_id: 22867470
         }
       }
+      is_const: true
     }
   }
 }
@@ -52,6 +54,7 @@ updates {
           action_id: 32601303
         }
       }
+      is_const: true
     }
   }
 }
@@ -71,6 +74,7 @@ updates {
           action_id: 17405675
         }
       }
+      is_const: true
     }
   }
 }
@@ -90,6 +94,7 @@ updates {
           action_id: 31935968
         }
       }
+      is_const: true
     }
   }
 }
@@ -109,6 +114,7 @@ updates {
           action_id: 24997060
         }
       }
+      is_const: true
     }
   }
 }

testdata/p4_16_samples_outputs/crc32-bmv2.p4.p4info.txt

@@ -37,6 +37,7 @@ tables {
   const_default_action_id: 32121835
   size: 1024
   is_const_table: true
+  has_initial_entries: true
 }
 actions {
   preamble {