[KVPOOL]decode save kvcache (#5168)

### What this PR does / why we need it?

kvpool decode save kvcache
now only support mla

### Does this PR introduce _any_ user-facing change?

### How was this patch tested?

- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

---------

Signed-off-by: baxingpiaochong <771405853@qq.com>
Co-authored-by: Chao Lei <leichao139636@163.com>

vllm_ascend/distributed/kvpool/ascend_store_connector.py

@@ -34,6 +34,8 @@ class AscendStoreConnector(KVConnectorBase_V1):
 
         self.use_layerwise = vllm_config.kv_transfer_config.kv_connector_extra_config.get(
             "use_layerwise", False)
+        self.consumer_is_to_put = vllm_config.kv_transfer_config.kv_connector_extra_config.get(
+            "consumer_is_to_put", False)
 
         connector_name = vllm_config.kv_transfer_config.kv_connector
         if connector_name == "MooncakeConnectorStoreV1":
@@ -121,7 +123,7 @@ class AscendStoreConnector(KVConnectorBase_V1):
         self.connector_worker.save_kv_layer(self._get_connector_metadata())
 
     def wait_for_save(self):
-        if self.kv_role == "kv_consumer":
+        if self.kv_role == "kv_consumer" and not self.consumer_is_to_put:
             # Don't do save if the role is kv_consumer
             return
 
@@ -135,7 +137,8 @@ class AscendStoreConnector(KVConnectorBase_V1):
         """Get the finished recving and sending requests."""
         assert self.connector_worker is not None
         meta = self._get_connector_metadata()
-        done_sending, done_recving = self.connector_worker.get_finished()
+        done_sending, done_recving = self.connector_worker.get_finished(
+            finished_req_ids)
         sended_and_finished: set[str] = set()
         for item in list(self.sended_but_unfinished_reqs):
             if item not in meta.unfinished_request_ids: