Migrate away from weights in host config

node/service/src/chain_spec.rs

@@ -190,8 +190,6 @@ fn default_parachains_host_configuration(
 		max_upward_queue_count: 8,
 		max_upward_queue_size: 1024 * 1024,
 		max_downward_message_size: 1024 * 1024,
-		ump_service_total_weight: Weight::from_ref_time(100_000_000_000)
-			.set_proof_size(MAX_POV_SIZE as u64),
 		max_upward_message_size: 50 * 1024,
 		max_upward_message_num_per_candidate: 5,
 		hrmp_sender_deposit: 0,

roadmap/implementers-guide/src/runtime/ump.md

@@ -52,36 +52,18 @@ Candidate Acceptance Function:
 * `check_upward_messages(P: ParaId, Vec<UpwardMessage>`):
     1. Checks that there are at most `config.max_upward_message_num_per_candidate` messages.
     1. Checks that no message exceeds `config.max_upward_message_size`.
-    1. Verify that `RelayDispatchQueueSize` for `P` has enough capacity for the messages
+    1. Verify that queuing up the messages could not result in exceeding the queue's footprint
+    according to the config items. The queue's current footprint is provided in well_known_keys
+    in order to facilitate oraclisation on to the para.
 
 Candidate Enactment:
 
 * `receive_upward_messages(P: ParaId, Vec<UpwardMessage>)`:
     1. Process each upward message `M` in order:
-        1. Append the message to `RelayDispatchQueues` for `P`
-        1. Increment the size and the count in `RelayDispatchQueueSize` for `P`.
-        1. Ensure that `P` is present in `NeedsDispatch`.
-
-The following routine is meant to execute pending entries in upward message queues. This function doesn't fail, even if
-dispatching any of individual upward messages returns an error.
-
-`process_pending_upward_messages()`:
-    1. Initialize a cumulative weight counter `T` to 0
-    1. Iterate over items in `NeedsDispatch` cyclically, starting with `NextDispatchRoundStartWith`. If the item specified is `None` start from the beginning. For each `P` encountered:
-        1. Dequeue the first upward message `D` from `RelayDispatchQueues` for `P`
-        1. Decrement the size of the message from `RelayDispatchQueueSize` for `P`
-        1. Delegate processing of the message to the runtime. The weight consumed is added to `T`.
-        1. If `T >= config.ump_service_total_weight`, set `NextDispatchRoundStartWith` to `P` and finish processing.
-        1. If `RelayDispatchQueues` for `P` became empty, remove `P` from `NeedsDispatch`.
-        1. If `NeedsDispatch` became empty then finish processing and set `NextDispatchRoundStartWith` to `None`.
-        > NOTE that in practice we would need to approach the weight calculation more thoroughly, i.e. incorporate all operations
-        > that could take place on the course of handling these upward messages.
+        1. Place in the dispatch queue according to its para ID (or handle it immediately).
 
 ## Session Change
 
-1. For each `P` in `outgoing_paras` (generated by `Paras::on_new_session`):
-    1. Remove `RelayDispatchQueueSize` of `P`.
-    1. Remove `RelayDispatchQueues` of `P`.
-    1. Remove `P` if it exists in `NeedsDispatch`.
-    1. If `P` is in `NextDispatchRoundStartWith`, then reset it to `None`
-    - Note that if we don't remove the open/close requests since they are going to die out naturally at the end of the session.
+1. Nothing specific needs to be done, however the channel's dispatch queue may possibly be "swept"
+which would prevent the dispatch queue from automatically being serviced. This is a consideration
+for the chain and specific behaviour is not defined.

roadmap/implementers-guide/src/types/runtime.md

@@ -65,11 +65,6 @@ struct HostConfiguration {
 	/// no further messages may be added to it. If it exceeds this then the queue may contain only
 	/// a single message.
 	pub max_upward_queue_size: u32,
-	/// The amount of weight we wish to devote to the processing the dispatchable upward messages
-	/// stage.
-	///
-	/// NOTE that this is a soft limit and could be exceeded.
-	pub ump_service_total_weight: Weight,
 	/// The maximum size of an upward message that can be sent by a candidate.
 	///
 	/// This parameter affects the upper bound of size of `CandidateCommitments`.

runtime/parachains/Cargo.toml

@@ -57,6 +57,7 @@ test-helpers = { package = "polkadot-primitives-test-helpers", path = "../../pri
 sp-tracing = { git = "https://github.com/paritytech/substrate", branch = "master" }
 thousands = "0.2.0"
 assert_matches = "1"
+pallet-message-queue = { git = "https://github.com/paritytech/substrate", branch = "master" }
 
 [features]
 default = ["std"]

runtime/parachains/src/configuration.rs

@@ -19,7 +19,7 @@
 //! Configuration can change only at session boundaries and is buffered until then.
 
 use crate::shared;
-use frame_support::{pallet_prelude::*, weights::constants::WEIGHT_PER_MILLIS};
+use frame_support::pallet_prelude::*;
 use frame_system::pallet_prelude::*;
 use parity_scale_codec::{Decode, Encode};
 use primitives::v2::{Balance, SessionIndex, MAX_CODE_SIZE, MAX_HEAD_DATA_SIZE, MAX_POV_SIZE};
@@ -126,11 +126,6 @@ pub struct HostConfiguration<BlockNumber> {
 	/// decide to do with its PoV so this value in practice will be picked as a fraction of the PoV
 	/// size.
 	pub max_downward_message_size: u32,
-	/// The amount of weight we wish to devote to the processing the dispatchable upward messages
-	/// stage.
-	///
-	/// NOTE that this is a soft limit and could be exceeded.
-	pub ump_service_total_weight: Weight,
 	/// The maximum number of outbound HRMP channels a parachain is allowed to open.
 	pub hrmp_max_parachain_outbound_channels: u32,
 	/// The maximum number of outbound HRMP channels a parathread is allowed to open.
@@ -210,9 +205,6 @@ pub struct HostConfiguration<BlockNumber> {
 	pub needed_approvals: u32,
 	/// The number of samples to do of the `RelayVRFModulo` approval assignment criterion.
 	pub relay_vrf_modulo_samples: u32,
-	/// The maximum amount of weight any individual upward message may consume. Messages above this
-	/// weight go into the overweight queue and may only be serviced explicitly.
-	pub ump_max_individual_weight: Weight,
 	/// This flag controls whether PVF pre-checking is enabled.
 	///
 	/// If the flag is false, the behavior should be exactly the same as prior. Specifically, the
@@ -272,7 +264,6 @@ impl<BlockNumber: Default + From<u32>> Default for HostConfiguration<BlockNumber
 			max_upward_queue_count: Default::default(),
 			max_upward_queue_size: Default::default(),
 			max_downward_message_size: Default::default(),
-			ump_service_total_weight: Default::default(),
 			max_upward_message_size: Default::default(),
 			max_upward_message_num_per_candidate: Default::default(),
 			hrmp_sender_deposit: Default::default(),
@@ -285,8 +276,6 @@ impl<BlockNumber: Default + From<u32>> Default for HostConfiguration<BlockNumber
 			hrmp_max_parachain_outbound_channels: Default::default(),
 			hrmp_max_parathread_outbound_channels: Default::default(),
 			hrmp_max_message_num_per_candidate: Default::default(),
-			ump_max_individual_weight: (20u64 * WEIGHT_PER_MILLIS)
-				.set_proof_size(MAX_POV_SIZE as u64),
 			pvf_checking_enabled: false,
 			pvf_voting_ttl: 2u32.into(),
 			minimum_validation_upgrade_delay: 2.into(),
@@ -391,7 +380,7 @@ where
 			})
 		}
 
-		if self.max_upward_message_size > crate::ump::MAX_UPWARD_MESSAGE_SIZE_BOUND {
+		if self.max_upward_message_size > crate::inclusion::MAX_UPWARD_MESSAGE_SIZE_BOUND {
 			return Err(MaxUpwardMessageSizeExceeded {
 				max_message_size: self.max_upward_message_size,
 			})
@@ -858,18 +847,6 @@ pub mod pallet {
 			})
 		}
 
-		/// Sets the soft limit for the phase of dispatching dispatchable upward messages.
-		#[pallet::weight((
-			T::WeightInfo::set_config_with_weight(),
-			DispatchClass::Operational,
-		))]
-		pub fn set_ump_service_total_weight(origin: OriginFor<T>, new: Weight) -> DispatchResult {
-			ensure_root(origin)?;
-			Self::schedule_config_update(|config| {
-				config.ump_service_total_weight = new;
-			})
-		}
-
 		/// Sets the maximum size of an upward message that can be sent by a candidate.
 		#[pallet::weight((
 			T::WeightInfo::set_config_with_u32(),
@@ -1044,18 +1021,6 @@ pub mod pallet {
 			})
 		}
 
-		/// Sets the maximum amount of weight any individual upward message may consume.
-		#[pallet::weight((
-			T::WeightInfo::set_config_with_weight(),
-			DispatchClass::Operational,
-		))]
-		pub fn set_ump_max_individual_weight(origin: OriginFor<T>, new: Weight) -> DispatchResult {
-			ensure_root(origin)?;
-			Self::schedule_config_update(|config| {
-				config.ump_max_individual_weight = new;
-			})
-		}
-
 		/// Enable or disable PVF pre-checking. Consult the field documentation prior executing.
 		#[pallet::weight((
 			// Using u32 here is a little bit of cheating, but that should be fine.

runtime/parachains/src/configuration/benchmarking.rs

@@ -26,8 +26,6 @@ benchmarks! {
 
 	set_config_with_option_u32 {}: set_max_validators(RawOrigin::Root, Some(10))
 
-	set_config_with_weight {}: set_ump_service_total_weight(RawOrigin::Root, Weight::from_ref_time(3_000_000))
-
 	set_hrmp_open_request_ttl {}: {
 		Err(BenchmarkError::Override(
 			BenchmarkResult::from_weight(T::BlockWeights::get().max_block)