[Feature] Support loading weights from ckpt engine worker (#11755)

Signed-off-by: Yang Kaiyong <yangkaiyong.yky@antgroup.com>
Signed-off-by: Cruz Zhao <CruzZhao@linux.alibaba.com>
Signed-off-by: Xuchun Shang <xuchun.shang@gmail.com>
Co-authored-by: Yang Kaiyong <yangkaiyong.yky@antgroup.com>
Co-authored-by: Cruz Zhao <CruzZhao@linux.alibaba.com>
Co-authored-by: Xuchun Shang <xuchun.shang@gmail.com>
Co-authored-by: Shangming Cai <csmthu@gmail.com>

python/sglang/srt/managers/tp_worker.py

@@ -32,6 +32,7 @@ from sglang.srt.managers.io_struct import (
     UnloadLoRAAdapterReqInput,
     UpdateWeightFromDiskReqInput,
     UpdateWeightsFromDistributedReqInput,
+    UpdateWeightsFromIPCReqInput,
     UpdateWeightsFromTensorReqInput,
 )
 from sglang.srt.managers.schedule_batch import ModelWorkerBatch
@@ -164,6 +165,11 @@ class BaseTpWorker(ABC):
         )
         return success, message
 
+    def update_weights_from_ipc(self, recv_req: UpdateWeightsFromIPCReqInput):
+        """Update weights from IPC for checkpoint-engine integration."""
+        success, message = self.model_runner.update_weights_from_ipc(recv_req)
+        return success, message
+
     def get_weights_by_name(self, recv_req: GetWeightsByNameReqInput):
         parameter = self.model_runner.get_weights_by_name(
             recv_req.name, recv_req.truncate_size