[Feat]添加CPLB功能，支持PCP模式下负载均衡

vllm/model_executor/layers/mla.py

@@ -201,6 +201,12 @@ class MultiHeadLatentAttentionWrapper(PluggableLayer):
                     k_pe.contiguous(), 0
                 )
 
+                gather_indexes_tensor = get_forward_context().gather_indexes_tensor
+                if envs.VLLM_MLA_CPLB and gather_indexes_tensor is not None:
+                    # Reorder kv after pcp allgather.
+                    kv_c_normed = torch.index_select(kv_c_normed, 0, gather_indexes_tensor)
+                    k_pe = torch.index_select(k_pe, 0, gather_indexes_tensor)
+
             attn_out = self.mla_attn(
                 q,
                 kv_c_normed,
@@ -244,6 +250,11 @@ class MultiHeadLatentAttentionWrapper(PluggableLayer):
                 k_pe = tensor_model_parallel_all_gather(
                     k_pe.contiguous(), 0
                 )
+                gather_indexes_tensor = get_forward_context().gather_indexes_tensor
+                if envs.VLLM_MLA_CPLB and gather_indexes_tensor is not None:
+                    # Reorder kv after pcp allgather.
+                    kv_c = torch.index_select(kv_c, 0, gather_indexes_tensor)
+                    k_pe = torch.index_select(k_pe, 0, gather_indexes_tensor)
 
             attn_out = self.mla_attn(
                 q[..., self.qk_nope_head_dim:],

vllm/model_executor/models/deepseek_mtp.py

@@ -200,6 +200,8 @@ class DeepSeekMultiTokenPredictor(nn.Module):
         current_step_idx = spec_step_idx % self.num_mtp_layers
         enable_mla_cp = get_forward_context().enable_mla_cp#envs.VLLM_MLA_CP # and not get_forward_context().draft_model
         if enable_mla_cp:
+            scatter_indexes_tensor = get_forward_context().scatter_indexes_tensor
+            if scatter_indexes_tensor is None:
                 inputs_embeds_per_rank = torch.chunk(inputs_embeds, chunks=self.tp_size, dim=0)
                 inputs_embeds = inputs_embeds_per_rank[self.tp_rank].contiguous()
 
@@ -209,6 +211,14 @@ class DeepSeekMultiTokenPredictor(nn.Module):
                 if positions is not None:
                     positions_per_rank = torch.chunk(positions, chunks=self.tp_size, dim=0)
                     positions = positions_per_rank[self.tp_rank].contiguous()
+            else:
+                #scatter_indexes_tensor = scatter_indexes_tensor[scatter_indexes_tensor != -1]
+                scatter_indexes_tensor = torch.where(scatter_indexes_tensor == -1, 0, scatter_indexes_tensor)
+                inputs_embeds = torch.index_select(inputs_embeds, 0, scatter_indexes_tensor)
+
+                previous_hidden_states = torch.index_select(previous_hidden_states, 0, scatter_indexes_tensor)
+                if positions is not None:
+                    positions = torch.index_select(positions, 0, scatter_indexes_tensor)
 
         hidden_states = self.layers[str(self.mtp_start_layer_idx + current_step_idx)](
             input_ids,
@@ -220,6 +230,9 @@ class DeepSeekMultiTokenPredictor(nn.Module):
 
         if enable_mla_cp:
             hidden_states = tensor_model_parallel_all_gather(hidden_states.contiguous(), dim=0)
+            gather_indexes_tensor = get_forward_context().gather_indexes_tensor
+            if gather_indexes_tensor is not None:
+                hidden_states = torch.index_select(hidden_states, 0, gather_indexes_tensor)
 
         return hidden_states
 

vllm/model_executor/models/deepseek_v2.py

@@ -855,6 +855,9 @@ class Indexer(nn.Module):
             k = tensor_model_parallel_all_gather(
                 k.contiguous(), 0
             )
+            gather_indexes_tensor = get_forward_context().gather_indexes_tensor
+            if envs.VLLM_MLA_CPLB and gather_indexes_tensor is not None:
+                k = torch.index_select(k, 0, gather_indexes_tensor)                
 
         # we only quant q here since k quant is fused with cache insertion
         if not current_platform.is_rocm() or torch.cuda.get_device_properties("cuda").gcnArchName.split(':')[0] == "gfx938":
@@ -1397,6 +1400,8 @@ class DeepseekV2Model(nn.Module):
 
         enable_mla_cp = get_forward_context().enable_mla_cp#envs.VLLM_MLA_CP # and not get_forward_context().draft_model
         if enable_mla_cp:
+            scatter_indexes_tensor = get_forward_context().scatter_indexes_tensor
+            if scatter_indexes_tensor is None:
                 hidden_states_per_rank = torch.chunk(hidden_states, chunks=self.tp_size, dim=0)
                 hidden_states = hidden_states_per_rank[self.tp_rank].contiguous()
 
@@ -1407,6 +1412,15 @@ class DeepseekV2Model(nn.Module):
                 if positions is not None:
                     positions_per_rank = torch.chunk(positions, chunks=self.tp_size, dim=0)
                     positions = positions_per_rank[self.tp_rank].contiguous()
+            else:
+                scatter_indexes_tensor = torch.where(scatter_indexes_tensor == -1, 0, scatter_indexes_tensor)
+                hidden_states = torch.index_select(hidden_states, 0, scatter_indexes_tensor)
+
+                if residual is not None:
+                    residual = torch.index_select(residual, 0, scatter_indexes_tensor)
+
+                if positions is not None:
+                    positions = torch.index_select(positions, 0, scatter_indexes_tensor)
 
         # Compute llama 4 scaling once per forward pass if enabled
         llama_4_scaling_config = getattr(self.config, "llama_4_scaling", None)
@@ -1439,6 +1453,9 @@ class DeepseekV2Model(nn.Module):
 
         if enable_mla_cp:
             hidden_states = tensor_model_parallel_all_gather(hidden_states.contiguous(), dim=0)
+            gather_indexes_tensor = get_forward_context().gather_indexes_tensor
+            if gather_indexes_tensor is not None:
+                hidden_states = torch.index_select(hidden_states, 0, gather_indexes_tensor)
 
         return hidden_states
 

vllm/v1/worker/gpu_model_runner.py

@@ -5159,7 +5159,7 @@ class GPUModelRunner(
                     batch_descriptor=batch_desc,
                     ubatch_slices=ubatch_slices_padded,
                     slot_mapping=slot_mappings,
-                    enable_mla_cp=envs.VLLM_MLA_CP and num_tokens_unpadded > self.mla_cp_threshould
+                    enable_mla_cp=envs.VLLM_MLA_CP and num_tokens_unpadded > self.mla_cp_threshould,
                 ),
             ):
                 outputs = self.model(