diff --git a/flexkv/common/config.py b/flexkv/common/config.py
index c79c1e5773..bbd941cd43 100644
--- a/flexkv/common/config.py
+++ b/flexkv/common/config.py
@@ -12,9 +12,9 @@
 
 @dataclass
 class ModelConfig:
-    num_layers: int = 0
-    num_kv_heads: int = 0
-    head_size: int = 0
+    num_layers: int = 1
+    num_kv_heads: int = 1
+    head_size: int = 1
     use_mla: bool = False
     dtype: torch.dtype = torch.bfloat16
 
diff --git a/flexkv/integration/config.py b/flexkv/integration/config.py
index 12d4d8ef14..9f40436b60 100644
--- a/flexkv/integration/config.py
+++ b/flexkv/integration/config.py
@@ -23,6 +23,8 @@ class FlexKVConfig:
     #base config
     server_recv_port: str = ""
 
+    gpu_register_port: str = ""
+
     # cache config
     cache_config: CacheConfig = field(default_factory=CacheConfig)
 
@@ -35,6 +37,8 @@ class FlexKVConfig:
     def __post_init__(self):
         if self.server_recv_port == "":
             self.server_recv_port = GLOBAL_CONFIG_FROM_ENV.server_recv_port
+        if self.gpu_register_port == "":
+            self.gpu_register_port = self.server_recv_port + "_gpu_register"
         update_default_config_from_user_config(self.model_config, self.cache_config, self.user_config)
 
     @classmethod
@@ -68,3 +72,45 @@ def post_init_from_vllm_config(
         self.model_config.dp_size = vllm_config.parallel_config.data_parallel_size
 
         self.__post_init__()
+
+    def post_init_from_sglang_config(
+        self,
+        sglang_config,
+        tp_size: int,
+        page_size: int,
+    ):
+        """
+        Initialize FlexKVConfig fields from sglang config.
+        Args:
+            sglang_config: sglang.srt.configs.model_config.ModelConfig-like object
+            tp_size: tensor parallel size used by sglang
+            page_size: KV block size (tokens per block) used by sglang
+        """
+        # cache config
+        self.cache_config.tokens_per_block = int(page_size)
+
+        self.model_config.num_layers = int(getattr(sglang_config, "num_hidden_layers", 0))
+
+        if hasattr(sglang_config, "get_num_kv_heads"):
+            try:
+                self.model_config.num_kv_heads = int(sglang_config.get_num_kv_heads(tp_size))
+            except Exception:
+                self.model_config.num_kv_heads = int(getattr(sglang_config, "num_key_value_heads", 0))
+        else:
+            self.model_config.num_kv_heads = int(getattr(sglang_config, "num_key_value_heads", 0))
+        self.model_config.head_size = int(getattr(sglang_config, "head_dim", 0))
+
+        self.model_config.dtype = getattr(sglang_config, "dtype", torch.bfloat16)
+
+        attn_arch = getattr(sglang_config, "attention_arch", None)
+        use_mla = False
+        if hasattr(attn_arch, "name"):
+            use_mla = (attn_arch.name.upper() == "MLA")
+        elif isinstance(attn_arch, str):
+            use_mla = (attn_arch.upper() == "MLA")
+        self.model_config.use_mla = use_mla
+
+        self.model_config.tp_size = int(tp_size)
+        self.model_config.dp_size = int(getattr(sglang_config, "dp_size", 1))
+
+        self.__post_init__()
diff --git a/flexkv/kvmanager.py b/flexkv/kvmanager.py
index cbf795648b..06aa79e618 100644
--- a/flexkv/kvmanager.py
+++ b/flexkv/kvmanager.py
@@ -31,7 +31,8 @@ def __init__(self,
                  model_config: ModelConfig,
                  cache_config: CacheConfig,
                  dp_client_id: int = 0,
-                 server_recv_port: str = ""):
+                 server_recv_port: str = "",
+                 gpu_register_port: str = ""):
         flexkv_logger.info(f"{model_config = }")
         flexkv_logger.info(f"{cache_config = }")
         flexkv_logger.info(f"{GLOBAL_CONFIG_FROM_ENV = }")
@@ -42,7 +43,10 @@ def __init__(self,
             self.server_recv_port = server_recv_port
         else:
             self.server_recv_port = GLOBAL_CONFIG_FROM_ENV.server_recv_port
-        self.gpu_register_port = self.server_recv_port + "_gpu_register"
+        if gpu_register_port != "":
+            self.gpu_register_port = gpu_register_port
+        else:
+            self.gpu_register_port = self.server_recv_port + "_gpu_register"
 
         self.server_client_mode = model_config.dp_size > 1 or GLOBAL_CONFIG_FROM_ENV.server_client_mode
         self.dp_client_id = dp_client_id