Support New Subnet Backbone (#13179)

* add in changes

* fix it up

* fix test

* gaz

* lint

* add back

* fix tests

* fix it

* fix tests

* add lib

* fix it

config/params/config.go

@@ -225,6 +225,13 @@ type BeaconChainConfig struct {
 
 	// Values introduced in Deneb hard fork
 	MaxPerEpochActivationChurnLimit uint64 `yaml:"MAX_PER_EPOCH_ACTIVATION_CHURN_LIMIT" spec:"true"` // MaxPerEpochActivationChurnLimit is the maximum amount of churn allotted for validator activation.
+
+	// Values related to the new subnet backbone
+	EpochsPerSubnetSubscription uint64 `yaml:"EPOCHS_PER_SUBNET_SUBSCRIPTION" spec:"true"` // EpochsPerSubnetSubscription specifies the minimum duration a validator is connected to their subnet.
+	AttestationSubnetExtraBits  uint64 `yaml:"ATTESTATION_SUBNET_EXTRA_BITS" spec:"true"`  // AttestationSubnetExtraBits is the number of extra bits of a NodeId to use when mapping to a subscribed subnet.
+	AttestationSubnetPrefixBits uint64 `yaml:"ATTESTATION_SUBNET_PREFIX_BITS" spec:"true"` // AttestationSubnetPrefixBits is defined as (ceillog2(ATTESTATION_SUBNET_COUNT) + ATTESTATION_SUBNET_EXTRA_BITS).
+	SubnetsPerNode              uint64 `yaml:"SUBNETS_PER_NODE" spec:"true"`               // SubnetsPerNode is the number of long-lived subnets a beacon node should be subscribed to.
+	NodeIdBits                  uint64 `yaml:"NODE_ID_BITS" spec:"true"`                   // NodeIdBits defines the bit length of a node id.
 }
 
 // InitializeForkSchedule initializes the schedules forks baked into the config.

config/params/loader.go

@@ -209,6 +209,11 @@ func ConfigToYaml(cfg *BeaconChainConfig) []byte {
 		fmt.Sprintf("DEPOSIT_CONTRACT_ADDRESS: %s", cfg.DepositContractAddress),
 		fmt.Sprintf("DENEB_FORK_EPOCH: %d", cfg.DenebForkEpoch),
 		fmt.Sprintf("DENEB_FORK_VERSION: %#x", cfg.DenebForkVersion),
+		fmt.Sprintf("EPOCHS_PER_SUBNET_SUBSCRIPTION: %d", cfg.EpochsPerSubnetSubscription),
+		fmt.Sprintf("ATTESTATION_SUBNET_EXTRA_BITS: %d", cfg.AttestationSubnetExtraBits),
+		fmt.Sprintf("ATTESTATION_SUBNET_PREFIX_BITS: %d", cfg.AttestationSubnetPrefixBits),
+		fmt.Sprintf("SUBNETS_PER_NODE: %d", cfg.SubnetsPerNode),
+		fmt.Sprintf("NODE_ID_BITS: %d", cfg.NodeIdBits),
 	}
 
 	yamlFile := []byte(strings.Join(lines, "\n"))

config/params/loader_test.go

@@ -25,13 +25,10 @@ import (
 var placeholderFields = []string{
 	"ATTESTATION_PROPAGATION_SLOT_RANGE",
 	"ATTESTATION_SUBNET_COUNT",
-	"ATTESTATION_SUBNET_EXTRA_BITS",
-	"ATTESTATION_SUBNET_PREFIX_BITS",
 	"EIP6110_FORK_EPOCH",
 	"EIP6110_FORK_VERSION",
 	"EIP7002_FORK_EPOCH",
 	"EIP7002_FORK_VERSION",
-	"EPOCHS_PER_SUBNET_SUBSCRIPTION",
 	"GOSSIP_MAX_SIZE",
 	"MAXIMUM_GOSSIP_CLOCK_DISPARITY",
 	"MAX_BLOBS_PER_BLOCK",
@@ -44,7 +41,6 @@ var placeholderFields = []string{
 	"MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS",
 	"MIN_EPOCHS_FOR_BLOCK_REQUESTS",
 	"RESP_TIMEOUT",
-	"SUBNETS_PER_NODE",
 	"TTFB_TIMEOUT",
 	"UPDATE_TIMEOUT",
 	"WHISK_EPOCHS_PER_SHUFFLING_PHASE",

config/params/mainnet_config.go

@@ -274,6 +274,13 @@ var mainnetBeaconConfig = &BeaconChainConfig{
 	BlobsidecarSubnetCount: 6,
 
 	MaxPerEpochActivationChurnLimit: 8,
+
+	// Values related to the new subnet backbone
+	EpochsPerSubnetSubscription: 256,
+	AttestationSubnetExtraBits:  0,
+	AttestationSubnetPrefixBits: 6,
+	SubnetsPerNode:              2,
+	NodeIdBits:                  256,
 }
 
 // MainnetTestConfig provides a version of the mainnet config that has a different name