Enable elastic scaling node feature in local testnets genesis

polkadot/node/service/Cargo.toml

@@ -93,6 +93,7 @@ kvdb-rocksdb = { version = "0.19.0", optional = true }
 parity-db = { version = "0.4.12", optional = true }
 codec = { package = "parity-scale-codec", version = "3.6.1" }
 parking_lot = "0.12.1"
+bitvec = { version = "1.0.1", optional = true }
 
 # Polkadot
 polkadot-core-primitives = { path = "../../core-primitives" }
@@ -184,8 +185,8 @@ full-node = [
 ]
 
 # Configure the native runtimes to use.
-westend-native = ["westend-runtime", "westend-runtime-constants"]
-rococo-native = ["rococo-runtime", "rococo-runtime-constants"]
+westend-native = ["bitvec", "westend-runtime", "westend-runtime-constants"]
+rococo-native = ["bitvec", "rococo-runtime", "rococo-runtime-constants"]
 
 runtime-benchmarks = [
 	"frame-benchmarking-cli/runtime-benchmarks",

polkadot/node/service/src/chain_spec.rs

@@ -122,7 +122,9 @@ pub fn wococo_config() -> Result<RococoChainSpec, String> {
 fn default_parachains_host_configuration(
 ) -> polkadot_runtime_parachains::configuration::HostConfiguration<polkadot_primitives::BlockNumber>
 {
-	use polkadot_primitives::{AsyncBackingParams, MAX_CODE_SIZE, MAX_POV_SIZE};
+	use polkadot_primitives::{
+		vstaging::node_features::FeatureIndex, AsyncBackingParams, MAX_CODE_SIZE, MAX_POV_SIZE,
+	};
 
 	polkadot_runtime_parachains::configuration::HostConfiguration {
 		validation_upgrade_cooldown: 2u32,
@@ -155,6 +157,9 @@ fn default_parachains_host_configuration(
 			max_candidate_depth: 3,
 			allowed_ancestry_len: 2,
 		},
+		node_features: bitvec::vec::BitVec::from_element(
+			1u8 << (FeatureIndex::ElasticScalingMVP as usize),
+		),
 		scheduler_params: SchedulerParams {
 			lookahead: 2,
 			group_rotation_frequency: 20,

polkadot/runtime/parachains/src/builder.rs

@@ -25,12 +25,13 @@ use bitvec::{order::Lsb0 as BitOrderLsb0, vec::BitVec};
 use frame_support::pallet_prelude::*;
 use frame_system::pallet_prelude::*;
 use primitives::{
-	collator_signature_payload, AvailabilityBitfield, BackedCandidate, CandidateCommitments,
-	CandidateDescriptor, CandidateHash, CollatorId, CollatorSignature, CommittedCandidateReceipt,
-	CompactStatement, CoreIndex, DisputeStatement, DisputeStatementSet, GroupIndex, HeadData,
-	Id as ParaId, IndexedVec, InherentData as ParachainsInherentData, InvalidDisputeStatementKind,
-	PersistedValidationData, SessionIndex, SigningContext, UncheckedSigned,
-	ValidDisputeStatementKind, ValidationCode, ValidatorId, ValidatorIndex, ValidityAttestation,
+	collator_signature_payload, vstaging::node_features::FeatureIndex, AvailabilityBitfield,
+	BackedCandidate, CandidateCommitments, CandidateDescriptor, CandidateHash, CollatorId,
+	CollatorSignature, CommittedCandidateReceipt, CompactStatement, CoreIndex, DisputeStatement,
+	DisputeStatementSet, GroupIndex, HeadData, Id as ParaId, IndexedVec,
+	InherentData as ParachainsInherentData, InvalidDisputeStatementKind, PersistedValidationData,
+	SessionIndex, SigningContext, UncheckedSigned, ValidDisputeStatementKind, ValidationCode,
+	ValidatorId, ValidatorIndex, ValidityAttestation,
 };
 use sp_core::{sr25519, H256};
 use sp_runtime::{
@@ -509,7 +510,7 @@ impl<T: paras_inherent::Config> BenchBuilder<T> {
 			.iter()
 			.map(|(seed, num_votes)| {
 				assert!(*num_votes <= validators.len() as u32);
-				let (para_id, _core_idx, group_idx) = self.create_indexes(*seed);
+				let (para_id, core_idx, group_idx) = self.create_indexes(*seed);
 
 				// This generates a pair and adds it to the keystore, returning just the public.
 				let collator_public = CollatorId::generate_pair(None);
@@ -586,11 +587,18 @@ impl<T: paras_inherent::Config> BenchBuilder<T> {
 					})
 					.collect();
 
+				// Check if the elastic scaling bit is set, if so we need to supply the core index
+				// in the generated candidate.
+				let core_idx = configuration::Pallet::<T>::config()
+					.node_features
+					.get(FeatureIndex::ElasticScalingMVP as usize)
+					.map(|_the_bit| core_idx);
+
 				BackedCandidate::<T::Hash>::new(
 					candidate,
 					validity_votes,
 					bitvec::bitvec![u8, bitvec::order::Lsb0; 1; group_validators.len()],
-					None,
+					core_idx,
 				)
 			})
 			.collect()

polkadot/zombienet_tests/functional/0012-elastic-scaling-mvp.zndsl

@@ -1,4 +1,4 @@
-Description: Test that a paraid acquiring multiple cores does not brick itself if ElasticScalingMVP feature is enabled
+Description: Test that a paraid acquiring multiple cores does not brick itself if ElasticScalingMVP feature is enabled in genesis
 Network: ./0012-elastic-scaling-mvp.toml
 Creds: config
 
@@ -15,14 +15,5 @@ alice: js-script ./0012-register-para.js return is 0 within 600 seconds
 
 validator: reports substrate_block_height{status="finalized"} is at least 35 within 100 seconds
 
-# Parachain will now be stalled
-validator: parachain 2000 block height is lower than 20 within 300 seconds
-
-# Enable the ElasticScalingMVP node feature.
-alice: js-script ./0012-enable-node-feature.js with "1" return is 0 within 600 seconds
-
-# Wait two sessions for the config to be updated.
-sleep 120 seconds
-
 # Ensure parachain is now making progress.
 validator: parachain 2000 block height is at least 30 within 200 seconds