Make MAX_BLOBS_PER_BLOCK a config parameter

configs/mainnet.yaml

@@ -147,6 +147,8 @@ MAX_REQUEST_BLOB_SIDECARS: 768
 MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS: 4096
 # `6`
 BLOB_SIDECAR_SUBNET_COUNT: 6
+## `uint64(6)`
+MAX_BLOBS_PER_BLOCK: 6
 
 # Whisk
 # `Epoch(2**8)`

configs/minimal.yaml

@@ -148,6 +148,8 @@ MAX_REQUEST_BLOB_SIDECARS: 768
 MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS: 4096
 # `6`
 BLOB_SIDECAR_SUBNET_COUNT: 6
+## `uint64(6)`
+MAX_BLOBS_PER_BLOCK: 6
 
 # Whisk
 WHISK_EPOCHS_PER_SHUFFLING_PHASE: 4

presets/mainnet/deneb.yaml

@@ -6,7 +6,5 @@
 FIELD_ELEMENTS_PER_BLOB: 4096
 # `uint64(2**12)` (= 4096)
 MAX_BLOB_COMMITMENTS_PER_BLOCK: 4096
-# `uint64(6)`
-MAX_BLOBS_PER_BLOCK: 6
 # `floorlog2(get_generalized_index(BeaconBlockBody, 'blob_kzg_commitments')) + 1 + ceillog2(MAX_BLOB_COMMITMENTS_PER_BLOCK)` = 4 + 1 + 12 = 17
 KZG_COMMITMENT_INCLUSION_PROOF_DEPTH: 17

presets/minimal/deneb.yaml

@@ -6,7 +6,5 @@
 FIELD_ELEMENTS_PER_BLOB: 4096
 # [customized]
 MAX_BLOB_COMMITMENTS_PER_BLOCK: 16
-# `uint64(6)`
-MAX_BLOBS_PER_BLOCK: 6
 # [customized] `floorlog2(get_generalized_index(BeaconBlockBody, 'blob_kzg_commitments')) + 1 + ceillog2(MAX_BLOB_COMMITMENTS_PER_BLOCK)` = 4 + 1 + 4 = 9
 KZG_COMMITMENT_INCLUSION_PROOF_DEPTH: 9

pysetup/spec_builders/deneb.py

@@ -70,7 +70,7 @@ def hardcoded_custom_type_dep_constants(cls, spec_object) -> Dict[str, str]:
         return {
             'BYTES_PER_FIELD_ELEMENT': spec_object.constant_vars['BYTES_PER_FIELD_ELEMENT'].value,
             'FIELD_ELEMENTS_PER_BLOB': spec_object.preset_vars['FIELD_ELEMENTS_PER_BLOB'].value,
-            'MAX_BLOBS_PER_BLOCK': spec_object.preset_vars['MAX_BLOBS_PER_BLOCK'].value,
+            'MAX_BLOBS_PER_BLOCK': spec_object.config_vars['MAX_BLOBS_PER_BLOCK'].value,
             'MAX_BLOB_COMMITMENTS_PER_BLOCK': spec_object.preset_vars['MAX_BLOB_COMMITMENTS_PER_BLOCK'].value,
         }
 

specs/deneb/beacon-chain.md

@@ -13,6 +13,7 @@
 - [Preset](#preset)
   - [Execution](#execution)
 - [Configuration](#configuration)
+  - [Execution](#execution-1)
   - [Validator cycle](#validator-cycle)
 - [Containers](#containers)
   - [Extended containers](#extended-containers)
@@ -77,13 +78,18 @@ Deneb is a consensus-layer upgrade containing a number of features. Including:
 | Name | Value | Description |
 | - | - | - |
 | `MAX_BLOB_COMMITMENTS_PER_BLOCK` | `uint64(2**12)` (= 4096) | *[New in Deneb:EIP4844]* hardfork independent fixed theoretical limit same as `LIMIT_BLOBS_PER_TX` (see EIP 4844) |
+
+## Configuration
+
+### Execution
+
+| Name | Value | Description |
+| - | - | - |
 | `MAX_BLOBS_PER_BLOCK`            | `uint64(6)` | *[New in Deneb:EIP4844]* maximum number of blobs in a single block limited by `MAX_BLOB_COMMITMENTS_PER_BLOCK` |
 
 *Note*: The blob transactions are packed into the execution payload by the EL/builder with their corresponding blobs being independently transmitted
 and are limited by `MAX_BLOB_GAS_PER_BLOCK // GAS_PER_BLOB`. However the CL limit is independently defined by `MAX_BLOBS_PER_BLOCK`.
 
-## Configuration
-
 ### Validator cycle
 
 | Name | Value |

tests/core/pyspec/eth2spec/test/deneb/block_processing/test_process_execution_payload.py

@@ -254,7 +254,7 @@ def test_invalid_correct_input__execution_invalid(spec, state):
 def test_invalid_exceed_max_blobs_per_block(spec, state):
     execution_payload = build_empty_execution_payload(spec, state)
 
-    opaque_tx, _, blob_kzg_commitments, _ = get_sample_opaque_tx(spec, blob_count=spec.MAX_BLOBS_PER_BLOCK + 1)
+    opaque_tx, _, blob_kzg_commitments, _ = get_sample_opaque_tx(spec, blob_count=spec.config.MAX_BLOBS_PER_BLOCK + 1)
 
     execution_payload.transactions = [opaque_tx]
     execution_payload.block_hash = compute_el_block_hash(spec, execution_payload)

tests/core/pyspec/eth2spec/test/deneb/unittests/test_config_invariants.py

@@ -9,17 +9,20 @@
 @spec_test
 @single_phase
 def test_length(spec):
-    assert spec.MAX_BLOBS_PER_BLOCK < spec.MAX_BLOB_COMMITMENTS_PER_BLOCK
+    assert spec.config.MAX_BLOBS_PER_BLOCK < spec.MAX_BLOB_COMMITMENTS_PER_BLOCK
 
 
 @with_deneb_and_later
 @spec_test
 @single_phase
 def test_networking(spec):
-    assert spec.MAX_BLOBS_PER_BLOCK < spec.MAX_BLOB_COMMITMENTS_PER_BLOCK
-    assert spec.config.MAX_REQUEST_BLOB_SIDECARS == spec.config.MAX_REQUEST_BLOCKS_DENEB * spec.MAX_BLOBS_PER_BLOCK
+    assert spec.config.MAX_BLOBS_PER_BLOCK < spec.MAX_BLOB_COMMITMENTS_PER_BLOCK
+    assert (
+        spec.config.MAX_REQUEST_BLOB_SIDECARS ==
+        spec.config.MAX_REQUEST_BLOCKS_DENEB * spec.config.MAX_BLOBS_PER_BLOCK
+    )
     # Start with the same size, but `BLOB_SIDECAR_SUBNET_COUNT` could potentially increase later.
-    assert spec.config.BLOB_SIDECAR_SUBNET_COUNT == spec.MAX_BLOBS_PER_BLOCK
+    assert spec.config.BLOB_SIDECAR_SUBNET_COUNT == spec.config.MAX_BLOBS_PER_BLOCK
     for i in range(spec.MAX_BLOB_COMMITMENTS_PER_BLOCK):
         gindex = spec.get_generalized_index(spec.BeaconBlockBody, 'blob_kzg_commitments', i)
         assert spec.floorlog2(gindex) == spec.KZG_COMMITMENT_INCLUSION_PROOF_DEPTH

tests/core/pyspec/eth2spec/test/eip7594/unittests/test_config_invariants.py

@@ -18,7 +18,7 @@ def test_invariants(spec):
     assert spec.config.MAX_REQUEST_DATA_COLUMN_SIDECARS == (
         spec.config.MAX_REQUEST_BLOCKS_DENEB * spec.config.NUMBER_OF_COLUMNS
     )
-    assert spec.config.MAX_CELLS_IN_EXTENDED_MATRIX == spec.MAX_BLOBS_PER_BLOCK * spec.config.NUMBER_OF_COLUMNS
+    assert spec.config.MAX_CELLS_IN_EXTENDED_MATRIX == spec.config.MAX_BLOBS_PER_BLOCK * spec.config.NUMBER_OF_COLUMNS
 
 
 @with_eip7594_and_later

tests/core/pyspec/eth2spec/test/eip7594/unittests/test_security.py

@@ -19,7 +19,7 @@ def test_sampling_config(spec):
     security_requirement = 0.01
     assert probability_of_unavailable <= security_requirement
 
-    column_size_in_bytes = spec.FIELD_ELEMENTS_PER_CELL * spec.BYTES_PER_FIELD_ELEMENT * spec.MAX_BLOBS_PER_BLOCK
+    column_size_in_bytes = spec.FIELD_ELEMENTS_PER_CELL * spec.BYTES_PER_FIELD_ELEMENT * spec.config.MAX_BLOBS_PER_BLOCK
     bytes_per_slot = column_size_in_bytes * spec.SAMPLES_PER_SLOT
     # TODO: What is the bandwidth requirement?
     bandwidth_requirement = 10000  # bytes/s

tests/core/pyspec/eth2spec/test/helpers/fork_choice.py

@@ -178,7 +178,7 @@ def add_block(spec,
 
     # Check blob_data
     if blob_data is not None:
-        blobs = spec.List[spec.Blob, spec.MAX_BLOBS_PER_BLOCK](blob_data.blobs)
+        blobs = spec.List[spec.Blob, spec.config.MAX_BLOBS_PER_BLOCK](blob_data.blobs)
         blobs_root = blobs.hash_tree_root()
         yield get_blobs_file_name(blobs_root=blobs_root), blobs
 

tests/core/pyspec/eth2spec/test/utils/randomized_block_tests.py

@@ -251,7 +251,7 @@ def random_block_deneb(spec, state, signed_blocks, scenario_state, rng=Random(34
     block = random_block_capella(spec, state, signed_blocks, scenario_state, rng=rng)
     # TODO: more commitments. blob_kzg_commitments: List[KZGCommitment, MAX_BLOBS_PER_BLOCK]
     opaque_tx, _, blob_kzg_commitments, _ = get_sample_opaque_tx(
-        spec, blob_count=rng.randint(0, spec.MAX_BLOBS_PER_BLOCK), rng=rng)
+        spec, blob_count=rng.randint(0, spec.config.MAX_BLOBS_PER_BLOCK), rng=rng)
     block.body.execution_payload.transactions.append(opaque_tx)
     block.body.execution_payload.block_hash = compute_el_block_hash(spec, block.body.execution_payload)
     block.body.blob_kzg_commitments = blob_kzg_commitments