Add establish_channel_with_system to the HRMP pallet

CHANGELOG.md

@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Added
 
 - Staking runtime api to check if reward is pending for an era ([polkadot-fellows/runtimes#318](https://github.com/polkadot-fellows/runtimes/pull/318))
+- Allow any parachain to have bidirectional channel with any system parachains ([polkadot-fellows/runtimes#329](https://github.com/polkadot-fellows/runtimes/pull/329))
 
 ### Fixed
 

relay/kusama/src/lib.rs

@@ -48,6 +48,7 @@ use sp_std::{cmp::Ordering, collections::btree_map::BTreeMap, prelude::*};
 use runtime_parachains::{
 	assigner_coretime as parachains_assigner_coretime,
 	assigner_on_demand as parachains_assigner_on_demand, configuration as parachains_configuration,
+	configuration::ActiveConfigHrmpChannelSizeAndCapacityRatio,
 	coretime, disputes as parachains_disputes,
 	disputes::slashing as parachains_slashing,
 	dmp as parachains_dmp, hrmp as parachains_hrmp, inclusion as parachains_inclusion,
@@ -1341,11 +1342,22 @@ impl pallet_message_queue::Config for Runtime {
 
 impl parachains_dmp::Config for Runtime {}
 
+parameter_types! {
+	pub const HrmpChannelSizeAndCapacityWithSystemRatio: Percent = Percent::from_percent(100);
+}
+
 impl parachains_hrmp::Config for Runtime {
 	type RuntimeOrigin = RuntimeOrigin;
 	type RuntimeEvent = RuntimeEvent;
 	type ChannelManager = EitherOf<EnsureRoot<Self::AccountId>, GeneralAdmin>;
 	type Currency = Balances;
+	// Use the `HrmpChannelSizeAndCapacityWithSystemRatio` ratio from the actual active
+	// `HostConfiguration` configuration for `hrmp_channel_max_message_size` and
+	// `hrmp_channel_max_capacity`.
+	type DefaultChannelSizeAndCapacityWithSystem = ActiveConfigHrmpChannelSizeAndCapacityRatio<
+		Runtime,
+		HrmpChannelSizeAndCapacityWithSystemRatio,
+	>;
 	type WeightInfo = weights::runtime_parachains_hrmp::WeightInfo<Runtime>;
 }
 

relay/polkadot/src/lib.rs

@@ -32,7 +32,9 @@ use polkadot_runtime_common::{
 
 use runtime_parachains::{
 	assigner_parachains as parachains_assigner_parachains,
-	configuration as parachains_configuration, disputes as parachains_disputes,
+	configuration as parachains_configuration,
+	configuration::ActiveConfigHrmpChannelSizeAndCapacityRatio,
+	disputes as parachains_disputes,
 	disputes::slashing as parachains_slashing,
 	dmp as parachains_dmp, hrmp as parachains_hrmp, inclusion as parachains_inclusion,
 	inclusion::{AggregateMessageOrigin, UmpQueueId},
@@ -1365,11 +1367,22 @@ impl pallet_message_queue::Config for Runtime {
 
 impl parachains_dmp::Config for Runtime {}
 
+parameter_types! {
+	pub const HrmpChannelSizeAndCapacityWithSystemRatio: Percent = Percent::from_percent(100);
+}
+
 impl parachains_hrmp::Config for Runtime {
 	type RuntimeOrigin = RuntimeOrigin;
 	type RuntimeEvent = RuntimeEvent;
 	type ChannelManager = EitherOf<EnsureRoot<Self::AccountId>, GeneralAdmin>;
 	type Currency = Balances;
+	// Use the `HrmpChannelSizeAndCapacityWithSystemRatio` ratio from the actual active
+	// `HostConfiguration` configuration for `hrmp_channel_max_message_size` and
+	// `hrmp_channel_max_capacity`.
+	type DefaultChannelSizeAndCapacityWithSystem = ActiveConfigHrmpChannelSizeAndCapacityRatio<
+		Runtime,
+		HrmpChannelSizeAndCapacityWithSystemRatio,
+	>;
 	type WeightInfo = weights::runtime_parachains_hrmp::WeightInfo<Self>;
 }