Fix sending all requests to the first rank in DP attention (#12832)

python/sglang/srt/managers/tokenizer_manager.py

@@ -902,10 +902,14 @@ class TokenizerManager(TokenizerCommunicatorMixin):
         Current policy:
         - Respect explicit server flag `enable_tokenizer_batch_encode`.
         - Or, if no request has text or multimodal input (all use pre-tokenized input_ids or input_embeds), batch the requests without tokenization.
+        - Batch tokenization does not support DP attention yet, and it will make everything goes to the first rank currently
         """
         return batch_size > 0 and (
             self.server_args.enable_tokenizer_batch_encode
-            or not self._batch_has_text(batch_size, requests)
+            or (
+                (not self.server_args.enable_dp_attention)
+                and (not self._batch_has_text(batch_size, requests))
+            )
         )
 
     def _send_one_request(