Distinguish between shred type in shred fetch stage duplicate filter (#10068)

* Shred type check

* Test

core/src/shred_fetch_stage.rs

@@ -4,7 +4,8 @@ use bv::BitVec;
 use solana_ledger::bank_forks::BankForks;
 use solana_ledger::blockstore::MAX_DATA_SHREDS_PER_SLOT;
 use solana_ledger::shred::{
-    OFFSET_OF_SHRED_INDEX, OFFSET_OF_SHRED_SLOT, SIZE_OF_SHRED_INDEX, SIZE_OF_SHRED_SLOT,
+    CODING_SHRED, DATA_SHRED, OFFSET_OF_SHRED_INDEX, OFFSET_OF_SHRED_SLOT, OFFSET_OF_SHRED_TYPE,
+    SIZE_OF_SHRED_INDEX, SIZE_OF_SHRED_SLOT,
 };
 use solana_perf::cuda_runtime::PinnedVec;
 use solana_perf::packet::{limited_deserialize, Packet, PacketsRecycler};
@@ -20,7 +21,7 @@ use std::sync::RwLock;
 use std::thread::{self, Builder, JoinHandle};
 use std::time::Instant;
 
-pub type ShredsReceived = HashMap<Slot, BitVec<u64>>;
+pub type ShredsReceived = HashMap<(Slot, u8), BitVec<u64>>;
 
 #[derive(Default)]
 struct ShredFetchStats {
@@ -78,17 +79,26 @@ impl ShredFetchStage {
         p.meta.discard = true;
         if let Some((slot, index)) = Self::get_slot_index(p, stats) {
             // Seems reasonable to limit shreds to 2 epochs away
-            if slot > last_root && slot < (last_slot + 2 * slots_per_epoch) {
-                // Shred filter
-                let slot_received = shreds_received
-                    .entry(slot)
-                    .or_insert_with(|| BitVec::new_fill(false, MAX_DATA_SHREDS_PER_SLOT as u64));
-                if !slot_received.get(index.into()) {
-                    p.meta.discard = false;
-                    modify(p);
-                    slot_received.set(index.into(), true);
-                } else {
-                    stats.duplicate_shred += 1;
+            if slot > last_root
+                && slot < (last_slot + 2 * slots_per_epoch)
+                && p.meta.size > OFFSET_OF_SHRED_TYPE
+            {
+                let shred_type = p.data[OFFSET_OF_SHRED_TYPE];
+                if shred_type == DATA_SHRED || shred_type == CODING_SHRED {
+                    // Shred filter
+                    let slot_received =
+                        shreds_received
+                            .entry((slot, shred_type))
+                            .or_insert_with(|| {
+                                BitVec::new_fill(false, MAX_DATA_SHREDS_PER_SLOT as u64)
+                            });
+                    if !slot_received.get(index.into()) {
+                        p.meta.discard = false;
+                        modify(p);
+                        slot_received.set(index.into(), true);
+                    } else {
+                        stats.duplicate_shred += 1;
+                    }
                 }
             } else {
                 stats.slot_out_of_range += 1;
@@ -258,6 +268,51 @@ mod tests {
     use super::*;
     use solana_ledger::shred::Shred;
 
+    #[test]
+    fn test_data_code_same_index() {
+        solana_logger::setup();
+        let mut shreds_received = ShredsReceived::default();
+        let mut packet = Packet::default();
+        let mut stats = ShredFetchStats::default();
+
+        let slot = 1;
+        let shred = Shred::new_from_data(slot, 3, 0, None, true, true, 0, 0, 0);
+        shred.copy_to_packet(&mut packet);
+
+        let last_root = 0;
+        let last_slot = 100;
+        let slots_per_epoch = 10;
+        ShredFetchStage::process_packet(
+            &mut packet,
+            &mut shreds_received,
+            &mut stats,
+            last_root,
+            last_slot,
+            slots_per_epoch,
+            &|_p| {},
+        );
+        assert!(!packet.meta.discard);
+
+        let coding = solana_ledger::shred::Shredder::generate_coding_shreds(
+            slot,
+            1.0f32,
+            &[shred],
+            10,
+            false,
+        );
+        coding[0].copy_to_packet(&mut packet);
+        ShredFetchStage::process_packet(
+            &mut packet,
+            &mut shreds_received,
+            &mut stats,
+            last_root,
+            last_slot,
+            slots_per_epoch,
+            &|_p| {},
+        );
+        assert!(!packet.meta.discard);
+    }
+
     #[test]
     fn test_shred_filter() {
         solana_logger::setup();

ledger/src/shred.rs

@@ -41,6 +41,7 @@ pub const SIZE_OF_DATA_SHRED_PAYLOAD: usize = PACKET_DATA_SIZE
     - SIZE_OF_DATA_SHRED_HEADER
     - SIZE_OF_DATA_SHRED_IGNORED_TAIL;
 
+pub const OFFSET_OF_SHRED_TYPE: usize = SIZE_OF_SIGNATURE;
 pub const OFFSET_OF_SHRED_SLOT: usize = SIZE_OF_SIGNATURE + SIZE_OF_SHRED_TYPE;
 pub const OFFSET_OF_SHRED_INDEX: usize = OFFSET_OF_SHRED_SLOT + SIZE_OF_SHRED_SLOT;