[CI] Add weight transfer tests to CI (#39821)

Signed-off-by: SumanthRH <sumanthrh99@gmail.com>
Co-authored-by: Robert Shaw <114415538+robertgshaw2-redhat@users.noreply.github.com>
Co-authored-by: Cyrus Leung <tlleungac@connect.ust.hk>

.buildkite/test_areas/distributed.yaml

@@ -196,6 +196,8 @@ steps:
     - VLLM_ALLOW_INSECURE_SERIALIZATION=1 python3 examples/rl/rlhf_async_new_apis.py
     - VLLM_USE_DEEP_GEMM=1 VLLM_LOGGING_LEVEL=DEBUG python3 examples/offline_inference/data_parallel.py --model=Qwen/Qwen1.5-MoE-A2.7B -tp=1 -dp=2 --max-model-len=2048 --all2all-backend=deepep_high_throughput
     - pytest -v -s tests/v1/distributed/test_dbo.py
+    - VLLM_ALLOW_INSECURE_SERIALIZATION=1 pytest -v -s tests/distributed/test_weight_transfer.py
+    - pytest -v -s tests/distributed/test_packed_tensor.py
 
 - label: Distributed Tests (2 GPUs)(B200)
   device: b200

tests/distributed/test_weight_transfer.py

@@ -41,6 +41,7 @@ def create_mock_parallel_config(
     config.rank = rank
     config.world_size = world_size
     config.data_parallel_rank = dp_rank
+    config.data_parallel_index = dp_rank
     return config
 
 
@@ -283,6 +284,7 @@ def inference_receive_tensor(
     parallel_config.rank = 0
     parallel_config.world_size = 1
     parallel_config.data_parallel_rank = 0
+    parallel_config.data_parallel_index = 0
 
     engine = NCCLWeightTransferEngine(config, parallel_config)
 
@@ -666,6 +668,7 @@ def inference_receive_ipc_tensor(
     parallel_config.rank = 0
     parallel_config.world_size = 1
     parallel_config.data_parallel_rank = 0
+    parallel_config.data_parallel_index = 0
 
     engine = IPCWeightTransferEngine(config, parallel_config)