[PAL] Support Device API Transport

flagcx/adaptor/flagcx_device.cc

@@ -696,6 +696,10 @@ flagcxResult_t flagcxDevCommCreate(flagcxComm_t comm,
     if (ret == flagcxSuccess)
       handle->devComm = innerDevComm;
   }
+  if (handle->devComm != nullptr && handle->intraSize > 0) {
+    int nNodes = handle->nRanks / handle->intraSize;
+    handle->nInterPeers = nNodes - 1;
+  }
   if (handle->devComm == nullptr) {
     // ---- Fallback path: IPC barriers + inter-node signal relay + one-sided
     // ----

flagcx/adaptor/include/device_api/comm_traits.h

@@ -36,50 +36,48 @@ template <typename PlatformTag>
 struct Fallback {};
 
 // ============================================================
-// Action types for one-sided operations (needed by traits Net types).
+// Action types for one-sided operations (needed by traits Transport types).
 // Pure POD structs with no device builtins.
 // ============================================================
-typedef uint32_t flagcxDevNetSignal_t;
-typedef uint32_t flagcxDevNetCounter_t;
+typedef uint32_t flagcxDevTransportSignal_t;
+typedef uint32_t flagcxDevTransportCounter_t;
 
-struct flagcxDevNet_None {};
-struct flagcxDevNet_SignalInc {
-  flagcxDevNetSignal_t signal;
+struct flagcxDevTransport_None {};
+struct flagcxDevTransport_SignalInc {
+  flagcxDevTransportSignal_t signal;
 };
-struct flagcxDevNet_SignalAdd {
-  flagcxDevNetSignal_t signal;
+struct flagcxDevTransport_SignalAdd {
+  flagcxDevTransportSignal_t signal;
   uint64_t value;
 };
-struct flagcxDevNet_CounterInc {
-  flagcxDevNetCounter_t counter;
+struct flagcxDevTransport_CounterInc {
+  flagcxDevTransportCounter_t counter;
 };
 
 // Shared memory descriptor for NIC descriptor optimization.
-// Uses void* on all paths; vendor Net casts to native type in toNccl().
+// Uses void* on all paths; vendor Transport casts to native type in toNccl().
 struct flagcxDescriptorSmem {
   void *_impl = nullptr;
 };
 
-struct flagcxDevNet_DescriptorSmem {
+struct flagcxDevTransport_DescriptorSmem {
   flagcxDescriptorSmem smem;
 };
 
 // Fence level enum — available on all tiers for unified barrier API
 enum class flagcxGinFenceLevel { Relaxed };
 
 // ============================================================
-// Barrier tag types for DevBarrier<Backend, Tag> dispatch.
+// Unified team/barrier tag types.
+// Used as both DevBarrier<Backend, Tag> template parameter
+// and as ctor dispatch tags — eliminating the old two-tag redundancy.
 // ============================================================
-struct flagcxBarrierIntra {};
-struct flagcxBarrierInter {};
-struct flagcxBarrierWorld {
-  struct World {}; // tag for world-barrier ctor
-  struct Intra {}; // tag for intra-only ctor
-  struct Inter {}; // tag for inter-only ctor
-};
+struct flagcxTeamTagIntra {};
+struct flagcxTeamTagInter {};
+struct flagcxTeamTagWorld {};
 
 // Primary template — each backend provides specializations
-template <typename Backend, typename BarrierTag, typename Coop>
+template <typename Backend, typename Tag, typename Coop>
 struct DevBarrier;
 
 // Vendor specializations + DeviceAPI selection