rpc : add native RDMA transport for RPC backend (RoCEv2) (ggml-org#20590)

Author: dvv101111

ggml/include/ggml-rpc.h

@@ -6,9 +6,9 @@
 extern "C" {
 #endif
 
-#define RPC_PROTO_MAJOR_VERSION    3
-#define RPC_PROTO_MINOR_VERSION    6
-#define RPC_PROTO_PATCH_VERSION    1
+#define RPC_PROTO_MAJOR_VERSION    4
+#define RPC_PROTO_MINOR_VERSION    0
+#define RPC_PROTO_PATCH_VERSION    0
 
 #ifdef  __cplusplus
 static_assert(GGML_OP_COUNT == 96, "GGML_OP_COUNT has changed - update RPC_PROTO_PATCH_VERSION");

ggml/src/ggml-rpc/CMakeLists.txt

@@ -7,3 +7,26 @@ ggml_add_backend_library(ggml-rpc
 if (WIN32)
     target_link_libraries(ggml-rpc PRIVATE ws2_32)
 endif()
+
+# RDMA auto-detection (Linux only, requires libibverbs)
+if (NOT WIN32 AND NOT APPLE)
+    find_library(IBVERBS_LIB ibverbs)
+    if (IBVERBS_LIB)
+        option(GGML_RPC_RDMA "ggml: enable RDMA transport for RPC" ON)
+    else()
+        option(GGML_RPC_RDMA "ggml: enable RDMA transport for RPC" OFF)
+    endif()
+else()
+    set(GGML_RPC_RDMA OFF CACHE BOOL "RDMA not available on this platform" FORCE)
+endif()
+
+if (GGML_RPC_RDMA)
+    if (NOT IBVERBS_LIB)
+        find_library(IBVERBS_LIB ibverbs REQUIRED)
+    endif()
+    target_compile_definitions(ggml-rpc PRIVATE GGML_RPC_RDMA)
+    target_link_libraries(ggml-rpc PRIVATE ${IBVERBS_LIB})
+    message(STATUS "  RDMA transport enabled (auto-detected)")
+else()
+    message(STATUS "  RDMA transport disabled")
+endif()