[DLLM] Basic dLLM scheduling strategy and implementation (#17484)

Signed-off-by: Zehuan Li <lizehuan.lzh@antgroup.com>

python/sglang/srt/dllm/mixin/req.py

@@ -0,0 +1,67 @@
+from __future__ import annotations
+
+import enum
+from typing import TYPE_CHECKING, Optional
+
+from sglang.srt.dllm.config import DllmConfig
+
+if TYPE_CHECKING:
+    from sglang.srt.managers.schedule_batch import Req
+
+
+class DllmReqPhase(str, enum.Enum):
+    STAGING_PREFILL = "staging_prefill"
+    STAGING_DECODE = "staging_decode"
+    INCOMING_PREFILL = "incoming_prefill"
+    INCOMING_DECODE = "incoming_decode"
+
+
+class ReqDllmMixin:
+    def init_diffusion_llm(self: Req, dllm_config: DllmConfig):
+        self.dllm_phase: Optional[DllmReqPhase] = None
+        self.dllm_ids = []
+        self.dllm_block_offset = 0
+        self.dllm_config = dllm_config
+
+        if self.dllm_config is not None:
+            if len(self.origin_input_ids) < self.dllm_config.block_size:
+                self.dllm_phase = DllmReqPhase.INCOMING_DECODE
+            else:
+                self.dllm_phase = DllmReqPhase.INCOMING_PREFILL
+
+    def is_dllm(self: Req) -> bool:
+        return self.dllm_config is not None
+
+    def is_dllm_prefill(self: Req) -> bool:
+        return self.dllm_phase in [
+            DllmReqPhase.STAGING_PREFILL,
+            DllmReqPhase.INCOMING_PREFILL,
+        ]
+
+    def determine_dllm_phase(self: Req):
+        prefix_length = len(self.prefix_indices)
+        min_required_length = prefix_length + self.dllm_config.block_size
+
+        if len(self.fill_ids) < min_required_length:
+            # still incoming stage
+            return
+
+        input_block = self.fill_ids[prefix_length:min_required_length]
+        is_prefill_phase = self.dllm_config.mask_id not in input_block
+
+        if is_prefill_phase:
+            self.dllm_phase = DllmReqPhase.STAGING_PREFILL
+        else:
+            self.dllm_phase = DllmReqPhase.STAGING_DECODE
+
+    def _init_fill_ids_for_dllm(self: Req):
+        if not self.dllm_ids:
+            self.dllm_ids = (
+                self.origin_input_ids
+                + [self.dllm_config.mask_id] * self.dllm_config.block_size
+            )
+        else:
+            self.dllm_block_offset += self.dllm_config.block_size
+            self.dllm_ids += [self.dllm_config.mask_id] * self.dllm_config.block_size
+
+        self.fill_ids = self.dllm_ids

python/sglang/srt/dllm/mixin/scheduler.py

@@ -0,0 +1,313 @@
+from __future__ import annotations
+
+import logging
+import time
+from typing import TYPE_CHECKING, List, Optional, Set, Union
+
+from sglang.srt.dllm.config import DllmConfig
+from sglang.srt.dllm.mixin.req import DllmReqPhase
+from sglang.srt.managers.schedule_batch import Req, RequestStage, ScheduleBatch
+from sglang.srt.managers.schedule_policy import AddReqResult, PrefillAdder
+from sglang.srt.model_executor.forward_batch_info import ForwardMode
+
+logger = logging.getLogger(__name__)
+
+if TYPE_CHECKING:
+    from sglang.srt.managers.scheduler import Scheduler
+
+
+class SchedulerDllmMixin:
+    def init_diffusion_llm(self: Scheduler):
+        self.dllm_config = (
+            DllmConfig.from_server_args(self.server_args)
+            if self.server_args.dllm_algorithm is not None
+            else None
+        )
+        self.dllm_manager = DllmManager(dllm_config=self.dllm_config)
+
+    def get_new_batch_dllm(self: Scheduler) -> Optional[ScheduleBatch]:
+        """Generate a new batch for DLLM (Diffusion LLM) scheduling."""
+        if self.try_preemption:
+            self.running_batch.batch_is_full = False
+
+        # Early exit if batch is full or no requests available
+        if self._should_skip_prefill():
+            return None
+
+        running_bs = len(self.running_batch.reqs)
+        self.policy.calc_priority(self.waiting_queue)
+
+        # Create prefill adder with resource constraints
+        adder = self._create_dllm_prefill_adder(running_bs)
+
+        # Initialize DLLM manager and transfer requests
+        self.dllm_manager.init_next_round()
+        self._fetch_waiting_reqs()
+
+        # Process batches
+        forward_mode = self._process_dllm_batches(adder)
+
+        can_run_list = adder.can_run_list
+        if not can_run_list:
+            return None
+
+        # Record metrics and update state
+        self._update_metrics_and_state_for_batch(can_run_list, adder, running_bs)
+
+        # Create and prepare batch
+        new_batch = self._create_dllm_batch(can_run_list, forward_mode)
+        return new_batch
+
+    def _fetch_waiting_reqs(self: Scheduler):
+        # Calculate how many requests can be added to DLLM manager
+        max_dllm_capacity = self.server_args.max_running_requests - len(
+            self.dllm_manager.waiting_queue
+        )
+        num_requests_to_add = min(max_dllm_capacity, len(self.waiting_queue))
+
+        if num_requests_to_add > 0:
+            requests_to_add = self.waiting_queue[:num_requests_to_add]
+            self.dllm_manager.add_waiting_reqs(requests_to_add)
+            self.waiting_queue = self.waiting_queue[num_requests_to_add:]
+
+    def _should_skip_prefill(self: Scheduler) -> bool:
+        """Check if DLLM prefill should be skipped."""
+        if (
+            self.running_batch.batch_is_full or not self.waiting_queue
+        ) and self.dllm_manager.is_empty():
+            return True
+
+        running_bs = len(self.running_batch.reqs)
+        if (
+            self.get_num_allocatable_reqs(running_bs) <= 0
+            and self.dllm_manager.is_empty()
+            and not self.try_preemption
+        ):
+            self.running_batch.batch_is_full = True
+            return True
+
+        return False
+
+    def _create_dllm_prefill_adder(self: Scheduler, running_bs: int) -> PrefillAdder:
+        """Create a prefill adder configured for DLLM scheduling."""
+        return PrefillAdder(
+            self.page_size,
+            self.tree_cache,
+            self.token_to_kv_pool_allocator,
+            self.running_batch,
+            self.new_token_ratio,
+            self.max_prefill_tokens,
+            self.chunked_prefill_size,
+            running_bs if self.is_mixed_chunk else 0,
+            self.priority_scheduling_preemption_threshold,
+            prefill_max_requests=self.server_args.prefill_max_requests,
+            dllm_config=self.dllm_config,
+        )
+
+    def _process_dllm_batches(self: Scheduler, adder: PrefillAdder) -> ForwardMode:
+        """Process prefill or decode batches for DLLM."""
+        forward_mode = ForwardMode.DLLM_EXTEND
+
+        # Try prefill batch first
+        prefill_reqs = self.dllm_manager.get_prefill_requests()
+        if prefill_reqs:
+            self._process_batch_by_phase(
+                adder,
+                prefill_reqs,
+                DllmReqPhase.STAGING_PREFILL,
+                DllmReqPhase.INCOMING_PREFILL,
+            )
+        else:
+            # Fall back to decode batch
+            decode_reqs = self.dllm_manager.get_decode_requests()
+            self._process_batch_by_phase(
+                adder,
+                decode_reqs,
+                DllmReqPhase.STAGING_DECODE,
+                DllmReqPhase.INCOMING_DECODE,
+            )
+
+        return forward_mode
+
+    def _process_batch_by_phase(
+        self,
+        adder: PrefillAdder,
+        batch: List[Req],
+        staging_phase: DllmReqPhase,
+        incoming_phase: DllmReqPhase,
+    ) -> None:
+        """Process a batch, separating staging and incoming requests."""
+        staging_reqs = [req for req in batch if req.dllm_phase == staging_phase]
+        if staging_reqs:
+            staging_result = self.process_dllm_staging_reqs(adder, staging_reqs)
+            if staging_result != AddReqResult.CONTINUE:
+                return
+
+        incoming_reqs = [req for req in batch if req.dllm_phase == incoming_phase]
+        if incoming_reqs:
+            self.process_dllm_incoming_reqs(adder, incoming_reqs)
+
+    def _update_metrics_and_state_for_batch(
+        self: Scheduler, can_run_list: List[Req], adder: PrefillAdder, running_bs: int
+    ) -> None:
+        """Update metrics and state for the batch."""
+        if self.enable_metrics:
+            for req in can_run_list:
+                req.add_latency(RequestStage.PREFILL_WAITING)
+
+        if adder.preempt_list:
+            for req in adder.preempt_list:
+                self._add_request_to_queue(req)
+
+        if can_run_list:
+            self.dllm_manager.add_staging_reqs(can_run_list)
+            self.dllm_manager.increment_chunked_count()
+
+        self.adder = adder
+        self.can_run_list = can_run_list
+        self.running_bs = len(self.running_batch.reqs)
+
+        for req in can_run_list:
+            if req.time_stats.forward_entry_time == 0:
+                req.time_stats.forward_entry_time = time.perf_counter()
+                if self.enable_metrics:
+                    self.metrics_collector.observe_queue_time(
+                        req.time_stats.get_queueing_time(),
+                    )
+
+    def _create_dllm_batch(
+        self: Scheduler, can_run_list: List[Req], forward_mode: ForwardMode
+    ) -> ScheduleBatch:
+        """Create and prepare a new DLLM batch."""
+        new_batch = ScheduleBatch.init_new(
+            can_run_list,
+            self.req_to_token_pool,
+            self.token_to_kv_pool_allocator,
+            self.tree_cache,
+            self.model_config,
+            self.enable_overlap,
+            self.spec_algorithm,
+            dllm_config=self.dllm_config,
+        )
+        new_batch.prepare_for_extend()
+        new_batch.forward_mode = forward_mode
+        new_batch.decoding_reqs = None
+        return new_batch
+
+    def process_dllm_incoming_reqs(
+        self: Scheduler, adder: PrefillAdder, reqs: List[Req]
+    ) -> AddReqResult:
+        """Process incoming DLLM requests with resource allocation and preemption."""
+        res = AddReqResult.CONTINUE
+        for req in reqs:
+            # Check if batch is full
+            running_bs = len(self.running_batch.reqs)
+            if len(adder.can_run_list) >= self.get_num_allocatable_reqs(running_bs):
+                self.running_batch.batch_is_full = True
+
+            # Try preemption if batch is full
+            if self.running_batch.batch_is_full:
+                if not self.try_preemption or not adder.preempt_to_schedule(
+                    req, self.server_args
+                ):
+                    break
+
+            # Prepare and add request
+            req.init_next_round_input(self.tree_cache)
+            res = adder.add_one_req(
+                req,
+                has_chunked_req=True,
+                truncation_align_size=self.truncation_align_size,
+            )
+
+            if res != AddReqResult.CONTINUE:
+                if res == AddReqResult.NO_TOKEN:
+                    self.running_batch.batch_is_full = True
+                break
+
+        return res
+
+    def process_dllm_staging_reqs(
+        self: Scheduler, adder: PrefillAdder, reqs: List[Req]
+    ) -> AddReqResult:
+        """Process staging DLLM requests with resource allocation."""
+        for req in reqs:
+            res = adder.add_dllm_staging_req(req)
+            if res == AddReqResult.NO_TOKEN:
+                return res
+
+        return AddReqResult.CONTINUE
+
+
+class DllmManager:
+    """
+    Manager for Diffusion LLM request scheduling.
+
+    Maintains two queues:
+    - waiting_queue: The requests waiting to be scheduled with max running requests limit
+    - staging_queue: Requests allocated resources by PrefillAdder
+    """
+
+    def __init__(self, dllm_config: Optional[DllmConfig] = None):
+        self.dllm_config = dllm_config
+        self.max_running_reqs = (
+            dllm_config.max_running_requests if dllm_config is not None else 1
+        )
+        self.waiting_queue: List[Req] = []
+        self.staging_queue: List[Req] = []
+
+    def get_prefill_requests(self) -> List[Req]:
+        """Get all prefill requests from waiting queue."""
+        return [req for req in self.waiting_queue if req.is_dllm_prefill()]
+
+    def get_decode_requests(self) -> List[Req]:
+        """Get all decode requests from waiting queue."""
+        return [req for req in self.waiting_queue if not req.is_dllm_prefill()]
+
+    def add_waiting_reqs(self, reqs: Union[Req, List[Req]]) -> None:
+        """Add requests to waiting queue with redundancy check."""
+        assert self.dllm_config is not None, "Diffusion LLM config is not set."
+
+        reqs_to_add = reqs if isinstance(reqs, list) else [reqs]
+
+        # Check for duplicate request IDs
+        if self._has_duplicate_reqs(reqs_to_add):
+            raise RuntimeError("Redundant requests detected in dLLM requests.")
+
+        self.waiting_queue.extend(reqs_to_add)
+
+    def add_staging_reqs(self, reqs: Union[Req, List[Req]]) -> None:
+        """Add requests to staging queue (allocated by PrefillAdder)."""
+        reqs_to_add = reqs if isinstance(reqs, list) else [reqs]
+        self.staging_queue.extend(reqs_to_add)
+
+    def _has_duplicate_reqs(self, reqs: List[Req]) -> bool:
+        """Check if any request ID already exists in waiting queue."""
+        existing_rids: Set[str] = {r.rid for r in self.waiting_queue}
+        return any(req.rid in existing_rids for req in reqs)
+
+    def any_staging_reqs(self) -> bool:
+        """Check if there are requests in staging queue."""
+        return self.dllm_config is not None and len(self.staging_queue) > 0
+
+    def is_empty(self) -> bool:
+        """Check if both queues are empty or DLLM is not configured."""
+        if self.dllm_config is None:
+            return True
+        return len(self.waiting_queue) == 0
+
+    def increment_chunked_count(self) -> None:
+        """Increment chunked count for all staging requests."""
+        for req in self.staging_queue:
+            req.is_chunked += 1
+
+    def filter_finished_reqs(self) -> None:
+        """Remove finished requests from both queues."""
+        self.waiting_queue = [req for req in self.waiting_queue if not req.finished()]
+        self.staging_queue = [req for req in self.staging_queue if not req.finished()]
+
+    def init_next_round(self) -> None:
+        """Initialize staging requests for next round and clear staging queue."""
+        for req in self.staging_queue:
+            req.init_next_round_input()
+        self.staging_queue = []

python/sglang/srt/managers/schedule_batch.py

@@ -58,6 +58,7 @@ from sglang.srt.disaggregation.decode_schedule_batch_mixin import (
 )
 from sglang.srt.disaggregation.utils import DisaggregationMode
 from sglang.srt.distributed.parallel_state import get_tensor_model_parallel_rank
+from sglang.srt.dllm.mixin.req import ReqDllmMixin
 from sglang.srt.environ import envs
 from sglang.srt.layers.attention.fla.chunk_delta_h import CHUNK_SIZE as FLA_CHUNK_SIZE
 from sglang.srt.mem_cache.allocator import BaseTokenToKVPoolAllocator
@@ -507,7 +508,7 @@ class RequestStage(str, enum.Enum):
     DECODE_QUICK_FINISH = "quick_finish"
 
 
-class Req:
+class Req(ReqDllmMixin):
     """The input and output status of a request."""
 
     def __init__(
@@ -804,9 +805,7 @@ class Req:
         self.dimensions = dimensions
 
         # For diffusion LLM
-        self.dllm_ids = []
-        self.dllm_block_offset = 0
-        self.dllm_config = dllm_config
+        self.init_diffusion_llm(dllm_config)
 
     @property
     def seqlen(self) -> int:
@@ -868,23 +867,10 @@ class Req:
         # Whether request reached finished condition
         return self.finished_reason is not None
 
-    def is_dllm(self):
-        return self.dllm_config is not None
-
-    def _init_fill_ids_for_dllm(self):
-        if not self.dllm_ids:
-            self.dllm_ids = (
-                self.origin_input_ids
-                + [self.dllm_config.mask_id] * self.dllm_config.block_size
-            )
-        else:
-            self.dllm_block_offset += self.dllm_config.block_size
-            self.dllm_ids += [self.dllm_config.mask_id] * self.dllm_config.block_size
-        self.fill_ids = self.dllm_ids
-
     def init_next_round_input(self, tree_cache: Optional[BasePrefixCache] = None):
         if self.is_dllm():
             self._init_fill_ids_for_dllm()
+            self.determine_dllm_phase()
         else:
             self.fill_ids = self.origin_input_ids + self.output_ids
 
@@ -1194,62 +1180,6 @@ class Req:
         )
 
 
-class DllmStagingReqs:
-    def __init__(self, dllm_config: Optional[DllmConfig] = None):
-        self.dllm_config = dllm_config
-        self.max_running_reqs = (
-            dllm_config.max_running_requests if dllm_config is not None else 1
-        )
-        self.reqs: List[Req] = []
-
-    def add_reqs(self, req: Union[Req, List[Req], "DllmStagingReqs"]):
-        assert self.dllm_config is not None, "Diffusion LLM config is not set."
-
-        if isinstance(req, DllmStagingReqs):
-            reqs_to_add = req.reqs
-        elif isinstance(req, list):
-            reqs_to_add = req
-        else:
-            reqs_to_add = [req]
-
-        num_to_add = len(reqs_to_add)
-
-        # Sanity check:
-        if self.check_redundant_reqs(reqs_to_add):
-            raise RuntimeError("Redundant requests detected in dLLM requests.")
-
-        if len(self.reqs) + num_to_add > self.max_running_reqs:
-            raise RuntimeError(
-                f"Exceeding maximum number of concurrent diffusion LLM requests: {self.max_running_reqs}"
-            )
-
-        self.reqs.extend(reqs_to_add)
-
-    def check_redundant_reqs(self, reqs: List[Req]) -> bool:
-        existing_rids: Set[str] = {r.rid for r in self.reqs}
-        return any(req.rid in existing_rids for req in reqs)
-
-    def init_next_round(self):
-        for req in self.reqs:
-            req.init_next_round_input()
-
-    def non_empty(self) -> bool:
-        return self.dllm_config is not None and len(self.reqs) > 0
-
-    def empty(self) -> bool:
-        return self.dllm_config is None or len(self.reqs) == 0
-
-    def update_chunked_status(self):
-        for req in self.reqs:
-            req.is_chunked += 1
-
-    def filter_finished_reqs(self):
-        self.reqs = [req for req in self.reqs if not req.finished()]
-
-    def __iter__(self):
-        return iter(self.reqs)
-
-
 @dataclasses.dataclass
 class ScheduleBatch(ScheduleBatchDisaggregationDecodeMixin):
     """Store all information of a batch on the scheduler."""
@@ -1370,7 +1300,6 @@ class ScheduleBatch(ScheduleBatchDisaggregationDecodeMixin):
     hicache_consumer_index: int = -1
 
     # Diffusion LLM
-    dllm_staging_reqs: Optional[DllmStagingReqs] = None
     dllm_config: Optional[DllmConfig] = None
 
     # Metrics
@@ -1387,7 +1316,6 @@ class ScheduleBatch(ScheduleBatchDisaggregationDecodeMixin):
         enable_overlap: bool,
         spec_algorithm: SpeculativeAlgorithm,
         chunked_req: Optional[Req] = None,
-        dllm_staging_reqs: Optional[DllmStagingReqs] = None,
         dllm_config: Optional[DllmConfig] = None,
     ):
         return_logprob = any(req.return_logprob for req in reqs)
@@ -1413,7 +1341,6 @@ class ScheduleBatch(ScheduleBatchDisaggregationDecodeMixin):
             return_routed_experts=any(req.return_routed_experts for req in reqs),
             is_prefill_only=all(req.is_prefill_only for req in reqs),
             chunked_req=chunked_req,
-            dllm_staging_reqs=dllm_staging_reqs,
             dllm_config=dllm_config,
         )
 

python/sglang/srt/managers/schedule_policy.py

@@ -34,7 +34,7 @@ import torch
 
 from sglang.srt.dllm.config import DllmConfig
 from sglang.srt.layers.attention.nsa.utils import is_nsa_prefill_cp_in_seq_split
-from sglang.srt.managers.schedule_batch import DllmStagingReqs, Req, ScheduleBatch
+from sglang.srt.managers.schedule_batch import Req, ScheduleBatch
 from sglang.srt.mem_cache.base_prefix_cache import (
     BasePrefixCache,
     InsertParams,
@@ -435,7 +435,6 @@ class PrefillAdder:
         max_running_reqs = dllm_config.max_running_requests
 
         self.rem_dllm_tokens = max_running_reqs * self.dllm_block_size
-        self.dllm_staging_reqs = DllmStagingReqs(dllm_config=dllm_config)
 
     def _get_running_request_total_token_offset(self, req: Req) -> int:
         return (
@@ -551,7 +550,6 @@ class PrefillAdder:
         req.fill_ids = req.fill_ids[: prefix_len + trunc_len]
 
         self.can_run_list.append(req)
-        self.dllm_staging_reqs.add_reqs(req)
 
         self._update_prefill_budget(prefix_len, trunc_len, 0)
 
@@ -562,6 +560,34 @@ class PrefillAdder:
         else:
             self.tree_cache.inc_lock_ref(req.last_node)
 
+    def add_dllm_staging_req(self, req: Req):
+        assert self.dllm_config is not None
+        _rem_tokens = self._get_dllm_remain_tokens()
+
+        if _rem_tokens <= 0:
+            return AddReqResult.NO_TOKEN
+
+        # Truncate input length to available tokens and update request metadata
+        truncated = req.extend_input_len > _rem_tokens
+        req.extend_input_len = min(req.extend_input_len, _rem_tokens)
+        req.fill_ids = req.fill_ids[: len(req.prefix_indices) + req.extend_input_len]
+        self.can_run_list.append(req)
+
+        # Update budget: reserve max_new_tokens only if not truncated
+        max_new_tokens = (
+            min(req.sampling_params.max_new_tokens, CLIP_MAX_NEW_TOKENS)
+            if not truncated
+            else 0
+        )
+        self._update_prefill_budget(0, req.extend_input_len, max_new_tokens)
+
+        # Return based on remaining token availability
+        return (
+            AddReqResult.NO_TOKEN
+            if self._get_dllm_remain_tokens() <= 0
+            else AddReqResult.CONTINUE
+        )
+
     def add_chunked_req(self, req: Req):
         if self.dllm_config is not None:
             _rem_tokens = self._get_dllm_remain_tokens()

python/sglang/srt/managers/scheduler.py

@@ -58,7 +58,7 @@ from sglang.srt.disaggregation.utils import (
 )
 from sglang.srt.distributed import get_pp_group, get_world_group
 from sglang.srt.distributed.parallel_state import get_tp_group
-from sglang.srt.dllm.config import DllmConfig
+from sglang.srt.dllm.mixin.scheduler import SchedulerDllmMixin
 from sglang.srt.environ import envs
 from sglang.srt.eplb.expert_distribution import get_global_expert_distribution_recorder
 from sglang.srt.layers.dp_attention import (
@@ -144,7 +144,6 @@ from sglang.srt.managers.schedule_batch import (
 )
 from sglang.srt.managers.schedule_policy import (
     AddReqResult,
-    DllmStagingReqs,
     PrefillAdder,
     SchedulePolicy,
 )
@@ -255,6 +254,7 @@ class Scheduler(
     SchedulerRuntimeCheckerMixin,
     SchedulerPPMixin,
     SchedulerDPAttnMixin,
+    SchedulerDllmMixin,
 ):
     """A scheduler that manages a tensor parallel GPU worker."""
 
@@ -399,11 +399,6 @@ class Scheduler(
 
     def init_model_config(self):
         self.model_config = ModelConfig.from_server_args(self.server_args)
-        self.dllm_config = (  # For diffusion LLM
-            DllmConfig.from_server_args(self.server_args)
-            if self.server_args.dllm_algorithm is not None
-            else None
-        )
 
     def init_ipc_channels(self, port_args: PortArgs):
         context = zmq.Context(2)
@@ -763,9 +758,6 @@ class Scheduler(
                 )
                 self.enable_dynamic_chunking = False
 
-    def init_diffusion_llm(self):
-        self.dllm_staging_reqs = DllmStagingReqs(dllm_config=self.dllm_config)
-
     def init_schedule_policy(self):
         # Init schedule policy and new token estimation
         self.policy = SchedulePolicy(
@@ -1323,7 +1315,7 @@ class Scheduler(
             # If it is a health check generation request and there are running requests, ignore it.
             if is_health_check_generate_req(recv_req) and (
                 self.chunked_req is not None
-                or self.dllm_staging_reqs.non_empty()
+                or self.dllm_manager.any_staging_reqs()
                 or not self.running_batch.is_empty()
                 or len(self.offload_tags) > 0
             ):
@@ -1830,20 +1822,15 @@ class Scheduler(
     def get_next_batch_to_run(self) -> Optional[ScheduleBatch]:
         self._abort_on_queued_timeout()
         if self.dllm_config is not None:
-            self.dllm_staging_reqs.filter_finished_reqs()
+            self.dllm_manager.filter_finished_reqs()
 
         # Merge the prefill batch into the running batch
         chunked_req_to_exclude = set()
 
-        if self.dllm_config is not None:
-            assert (
-                self.chunked_req is None
-            ), "chunked_req should be None when dllm_config is set"
-
-            if self.dllm_staging_reqs.non_empty():
-                chunked_req_to_exclude.update(self.dllm_staging_reqs)
-                for req in self.dllm_staging_reqs:
-                    self.stash_chunked_request(req)
+        if self.dllm_config is not None and self.dllm_manager.any_staging_reqs():
+            chunked_req_to_exclude.update(self.dllm_manager.staging_queue)
+            for req in self.dllm_manager.staging_queue:
+                self.stash_chunked_request(req)
 
         if self.chunked_req is not None:
             # Move the chunked request out of the batch so that we can merge
@@ -1857,8 +1844,8 @@ class Scheduler(
                 # We need to discard it.
                 chunked_req_to_exclude.add(self.last_batch.chunked_req)
 
-            if self.last_batch.dllm_staging_reqs.non_empty():
-                chunked_req_to_exclude.update(self.last_batch.dllm_staging_reqs)
+            if self.dllm_config is not None and self.last_batch.reqs:
+                chunked_req_to_exclude.update(self.last_batch.reqs)
 
             # Filter batch
             last_bs = self.last_batch.batch_size()
@@ -1877,7 +1864,10 @@ class Scheduler(
                     # Merge running_batch with prefill batch
                     self.running_batch.merge_batch(self.last_batch)
 
-        new_batch = self.get_new_batch_prefill()
+        if self.dllm_config is not None:
+            new_batch = self.get_new_batch_dllm()
+        else:
+            new_batch = self.get_new_batch_prefill()
 
         need_mlp_sync = self.require_mlp_sync
         if need_mlp_sync and not self.spec_algorithm.is_none():
@@ -1947,9 +1937,9 @@ class Scheduler(
             # Reset batch_is_full to try preemption with a prefill adder.
             self.running_batch.batch_is_full = False
 
-        if (self.running_batch.batch_is_full or len(self.waiting_queue) == 0) and (
-            not self.dllm_staging_reqs.non_empty() and self.chunked_req is None
-        ):
+        if (
+            self.running_batch.batch_is_full or len(self.waiting_queue) == 0
+        ) and self.chunked_req is None:
             return None
 
         running_bs = len(self.running_batch.reqs)
@@ -1960,7 +1950,7 @@ class Scheduler(
         # Instead, we should always allow chunked requests to be added, otherwise, there will be a memory leak.
         if (
             self.get_num_allocatable_reqs(running_bs) <= 0
-            and (self.dllm_staging_reqs.empty() or self.chunked_req is not None)
+            and self.chunked_req is not None
             and not self.try_preemption
         ):
             self.running_batch.batch_is_full = True
@@ -2002,17 +1992,6 @@ class Scheduler(
             dllm_config=self.dllm_config,
         )
 
-        if self.dllm_config is not None:
-            assert (
-                self.chunked_req is None
-            ), "chunked_req should be None when dllm_config is set"
-
-            if self.dllm_staging_reqs.non_empty():
-                self.dllm_staging_reqs.init_next_round()
-                for req in self.dllm_staging_reqs:
-                    adder.add_chunked_req(req)
-                self.dllm_staging_reqs.add_reqs(adder.dllm_staging_reqs)
-
         if self.chunked_req is not None:
             self.chunked_req.init_next_round_input()
             self.chunked_req = adder.add_chunked_req(self.chunked_req)
@@ -2066,9 +2045,7 @@ class Scheduler(
             req.init_next_round_input(self.tree_cache)
             res = adder.add_one_req(
                 req,
-                has_chunked_req=(
-                    self.dllm_staging_reqs.non_empty() or self.chunked_req is not None
-                ),
+                has_chunked_req=(self.chunked_req is not None),
                 truncation_align_size=self.truncation_align_size,
             )
 
@@ -2103,14 +2080,6 @@ class Scheduler(
             for req in adder.preempt_list:
                 self._add_request_to_queue(req)
 
-        if self.dllm_config is not None:
-            assert (
-                self.chunked_req is None
-            ), "chunked_req should be None when dllm_config is set"
-
-            if adder.dllm_staging_reqs.non_empty():
-                self.dllm_staging_reqs.add_reqs(adder.dllm_staging_reqs)
-
         if adder.new_chunked_req is not None:
             # Update chunked prefill
             assert self.chunked_req is None
@@ -2119,9 +2088,6 @@ class Scheduler(
         if self.chunked_req is not None:
             self.chunked_req.is_chunked += 1
 
-        if self.dllm_staging_reqs.non_empty():
-            self.dllm_staging_reqs.update_chunked_status()
-
         # Record for logging prefill stats after forward
         self.adder = adder
         self.can_run_list = can_run_list
@@ -2146,8 +2112,6 @@ class Scheduler(
             self.enable_overlap,
             self.spec_algorithm,
             chunked_req=self.chunked_req,
-            dllm_staging_reqs=self.dllm_staging_reqs,
-            dllm_config=self.dllm_config,
         )
         if self.enable_hierarchical_cache:
             # todo (zhiqiang): disable cuda graph execution if hicache loading triggered

python/sglang/srt/model_executor/forward_batch_info.py

@@ -95,7 +95,7 @@ class ForwardMode(IntEnum):
     # Split Prefill for PD multiplexing
     SPLIT_PREFILL = auto()
 
-    # Used in diffusion LLM inference
+    # Used in dLLM
     DLLM_EXTEND = auto()
 
     def is_prefill(self):

python/sglang/srt/server_args.py

@@ -2758,6 +2758,24 @@ class ServerArgs:
             )
             self.pp_size = 1
 
+        if self.enable_lora:
+            logger.warning(
+                "Currently LoRA is not supported by diffusion LLM inference."
+            )
+            self.enable_lora = False
+
+        if self.disaggregation_mode != "null":
+            logger.warning(
+                "Currently disaggregation is not supported by diffusion LLM inference."
+            )
+            self.disaggregation_mode = "null"
+
+        if self.enable_mixed_chunk:
+            logger.warning(
+                "Mixed chunked prefill is disabled because of using diffusion LLM inference."
+            )
+            self.enable_mixed_chunk = False
+
     def _handle_other_validations(self):
         # Handle model inference tensor dump.
         if self.debug_tensor_dump_output_folder is not None: