[Fix] Fix several issues preventing gemma3n LoRA support. (#8776)

python/sglang/srt/server_args.py

@@ -1943,10 +1943,16 @@ class ServerArgs:
         if "Llama4" in model_arch:
             assert self.attention_backend == "fa3", "fa3 is required for Llama4 model"
 
-        if "Gemma2ForCausalLM" in model_arch:
+        if model_arch in [
+            "Gemma2ForCausalLM",
+            "Gemma3nForCausalLM",
+            "Gemma3nForConditionalGeneration",
+        ]:
             # FIXME: https://github.com/sgl-project/sglang/pull/7367 is not compatible with gemma2 model.
             # It failed at this test: https://github.com/sgl-project/sglang/actions/runs/16255155597/job/45890331952#step:4:736
-            logger.warning("Disable hybrid SWA memory for Gemma2ForCausalLM.")
+            logger.warning(
+                f"Disable hybrid SWA memory for {model_arch} as it is not yet supported."
+            )
             self.disable_hybrid_swa_memory = True
 
         # Check LoRA