[Backport] Add feature to allow Aura collator to use full PoV size (#5393)

cumulus/client/consensus/aura/Cargo.toml

@@ -79,3 +79,7 @@ polkadot-node-subsystem.workspace = true
 polkadot-node-subsystem.default-features = true
 polkadot-overseer.workspace = true
 polkadot-overseer.default-features = true
+
+[features]
+# Allows collator to use full PoV size for block building
+full-pov-size = []

cumulus/client/consensus/aura/src/collators/basic.rs

@@ -234,6 +234,16 @@ where
 					.await
 			);
 
+			let allowed_pov_size = if cfg!(feature = "full-pov-size") {
+				validation_data.max_pov_size
+			} else {
+				// Set the block limit to 50% of the maximum PoV size.
+				//
+				// TODO: If we got benchmarking that includes the proof size,
+				// we should be able to use the maximum pov size.
+				validation_data.max_pov_size / 2
+			} as usize;
+
 			let maybe_collation = try_request!(
 				collator
 					.collate(
@@ -242,11 +252,7 @@ where
 						None,
 						(parachain_inherent_data, other_inherent_data),
 						params.authoring_duration,
-						// Set the block limit to 50% of the maximum PoV size.
-						//
-						// TODO: If we got benchmarking that includes the proof size,
-						// we should be able to use the maximum pov size.
-						(validation_data.max_pov_size / 2) as usize,
+						allowed_pov_size,
 					)
 					.await
 			);

cumulus/client/consensus/aura/src/collators/lookahead.rs

@@ -319,18 +319,24 @@ where
 				)
 				.await;
 
+				let allowed_pov_size = if cfg!(feature = "full-pov-size") {
+					validation_data.max_pov_size
+				} else {
+					// Set the block limit to 50% of the maximum PoV size.
+					//
+					// TODO: If we got benchmarking that includes the proof size,
+					// we should be able to use the maximum pov size.
+					validation_data.max_pov_size / 2
+				} as usize;
+
 				match collator
 					.collate(
 						&parent_header,
 						&slot_claim,
 						None,
 						(parachain_inherent_data, other_inherent_data),
 						params.authoring_duration,
-						// Set the block limit to 50% of the maximum PoV size.
-						//
-						// TODO: If we got benchmarking that includes the proof size,
-						// we should be able to use the maximum pov size.
-						(validation_data.max_pov_size / 2) as usize,
+						allowed_pov_size,
 					)
 					.await
 				{

cumulus/client/consensus/aura/src/collators/slot_based/block_builder_task.rs

@@ -350,18 +350,24 @@ where
 			)
 			.await;
 
+			let allowed_pov_size = if cfg!(feature = "full-pov-size") {
+				validation_data.max_pov_size
+			} else {
+				// Set the block limit to 50% of the maximum PoV size.
+				//
+				// TODO: If we got benchmarking that includes the proof size,
+				// we should be able to use the maximum pov size.
+				validation_data.max_pov_size / 2
+			} as usize;
+
 			let Ok(Some(candidate)) = collator
 				.build_block_and_import(
 					&parent_header,
 					&slot_claim,
 					None,
 					(parachain_inherent_data, other_inherent_data),
 					authoring_duration,
-					// Set the block limit to 50% of the maximum PoV size.
-					//
-					// TODO: If we got benchmarking that includes the proof size,
-					// we should be able to use the maximum pov size.
-					(validation_data.max_pov_size / 2) as usize,
+					allowed_pov_size,
 				)
 				.await
 			else {

prdoc/pr_5507.prdoc

@@ -0,0 +1,15 @@
+# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
+# See doc at https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/prdoc/schema_user.json
+
+title: Allow to enable full PoV size
+
+doc:
+  - audience: Node Dev
+    description: |
+      A feature is introduced allowing a collator to enable full PoV size at compile time.
+      WARNING: To use this feature, security considerations must be understood and the latest
+      SDK version must be used.
+
+crates:
+  - name: cumulus-client-consensus-aura
+    bump: minor