removes feature gate code adding shred-type to shred seed (#25963)

The feature is already activated on all clusters, and does not impact
processing of ledger/snapshots.

core/src/cluster_nodes.rs

@@ -122,7 +122,7 @@ impl ClusterNodes<BroadcastStage> {
         socket_addr_space: &SocketAddrSpace,
     ) -> Vec<SocketAddr> {
         const MAX_CONTACT_INFO_AGE: Duration = Duration::from_secs(2 * 60);
-        let shred_seed = shred.seed(self.pubkey, root_bank);
+        let shred_seed = shred.seed(self.pubkey);
         let mut rng = ChaChaRng::from_seed(shred_seed);
         let index = match self.weighted_shuffle.first(&mut rng) {
             None => return Vec::default(),
@@ -221,7 +221,7 @@ impl ClusterNodes<RetransmitStage> {
         Vec<&Node>, // neighbors
         Vec<&Node>, // children
     ) {
-        let shred_seed = shred.seed(slot_leader, root_bank);
+        let shred_seed = shred.seed(slot_leader);
         let mut weighted_shuffle = self.weighted_shuffle.clone();
         // Exclude slot leader from list of nodes.
         if slot_leader == self.pubkey {

ledger/src/shred.rs

@@ -62,10 +62,8 @@ use {
     serde::{Deserialize, Serialize},
     solana_entry::entry::{create_ticks, Entry},
     solana_perf::packet::{deserialize_from_with_limit, Packet},
-    solana_runtime::bank::Bank,
     solana_sdk::{
         clock::Slot,
-        feature_set,
         hash::{hashv, Hash},
         pubkey::Pubkey,
         signature::{Keypair, Signature, Signer},
@@ -433,21 +431,13 @@ impl Shred {
         self.set_signature(signature);
     }
 
-    pub fn seed(&self, leader_pubkey: Pubkey, root_bank: &Bank) -> [u8; 32] {
-        if add_shred_type_to_shred_seed(self.slot(), root_bank) {
-            hashv(&[
-                &self.slot().to_le_bytes(),
-                &u8::from(self.shred_type()).to_le_bytes(),
-                &self.index().to_le_bytes(),
-                &leader_pubkey.to_bytes(),
-            ])
-        } else {
-            hashv(&[
-                &self.slot().to_le_bytes(),
-                &self.index().to_le_bytes(),
-                &leader_pubkey.to_bytes(),
-            ])
-        }
+    pub fn seed(&self, leader_pubkey: Pubkey) -> [u8; 32] {
+        hashv(&[
+            &self.slot().to_le_bytes(),
+            &u8::from(self.shred_type()).to_le_bytes(),
+            &self.index().to_le_bytes(),
+            &leader_pubkey.to_bytes(),
+        ])
         .to_bytes()
     }
 
@@ -742,21 +732,6 @@ pub fn verify_test_data_shred(
     }
 }
 
-fn add_shred_type_to_shred_seed(shred_slot: Slot, bank: &Bank) -> bool {
-    let feature_slot = bank
-        .feature_set
-        .activated_slot(&feature_set::add_shred_type_to_shred_seed::id());
-    match feature_slot {
-        None => false,
-        Some(feature_slot) => {
-            let epoch_schedule = bank.epoch_schedule();
-            let feature_epoch = epoch_schedule.get_epoch(feature_slot);
-            let shred_epoch = epoch_schedule.get_epoch(shred_slot);
-            feature_epoch < shred_epoch
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use {

sdk/src/feature_set.rs

@@ -408,10 +408,6 @@ pub mod include_account_index_in_rent_error {
     solana_sdk::declare_id!("2R72wpcQ7qV7aTJWUumdn8u5wmmTyXbK7qzEy7YSAgyY");
 }
 
-pub mod add_shred_type_to_shred_seed {
-    solana_sdk::declare_id!("Ds87KVeqhbv7Jw8W6avsS1mqz3Mw5J3pRTpPoDQ2QdiJ");
-}
-
 pub mod warp_timestamp_with_a_vengeance {
     solana_sdk::declare_id!("3BX6SBeEBibHaVQXywdkcgyUk6evfYZkHdztXiDtEpFS");
 }
@@ -544,7 +540,6 @@ lazy_static! {
         (add_set_compute_unit_price_ix::id(), "add compute budget ix for setting a compute unit price"),
         (disable_deploy_of_alloc_free_syscall::id(), "disable new deployments of deprecated sol_alloc_free_ syscall"),
         (include_account_index_in_rent_error::id(), "include account index in rent tx error #25190"),
-        (add_shred_type_to_shred_seed::id(), "add shred-type to shred seed #25556"),
         (warp_timestamp_with_a_vengeance::id(), "warp timestamp again, adjust bounding to 150% slow #25666"),
         (separate_nonce_from_blockhash::id(), "separate durable nonce and blockhash domains #25744"),
         (enable_durable_nonce::id(), "enable durable nonce #25744"),