[spinel] add support for multiple spinel interfaces (#9360)

This feature allows the RCP to support multiple host stacks on different PANs
by making use of the spinel Interface ID.

Created unit tests for testing multipan feature with multiple ot-instance
support.

Based on Si-Labs PR #8914 by @parag-silabs, but a little different approach.
Instead of handling everything by a single sub-mac instance, multiple
OpenThread instances are created on RCP side that map to different IID.
Thanks to this there are separate data kept for each interface. Platform
is able to determine interface by ot instance pointer passed as an argument
to most of the API functions.
Tx/scan queue was removed as it is possible to request transmission in
parallel, it is up to the platform to decide if it should fail or queue
second tx or it has two radios available.

NOTE:
Platform needs to provide different otRadioFrame of each instance and
the processing needs to take into account the instance being used.

Signed-off-by: Marek Porwisz <[email protected]>

examples/apps/ncp/main.c

@@ -42,6 +42,16 @@
 #include "openthread-system.h"
 
 #include "lib/platform/reset_util.h"
+
+#if OPENTHREAD_CONFIG_MULTIPAN_RCP_ENABLE
+#if OPENTHREAD_CONFIG_MULTIPLE_STATIC_INSTANCE_ENABLE == 0
+#error "Support for multiple OpenThread static instance is disabled."
+#endif
+#define ENDPOINT_CT OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_NUM
+#else
+#define ENDPOINT_CT 1
+#endif /* OPENTHREAD_CONFIG_MULTIPAN_RCP_ENABLE */
+
 /**
  * Initializes the NCP app.
  *
@@ -49,6 +59,7 @@
  *
  */
 extern void otAppNcpInit(otInstance *aInstance);
+extern void otAppNcpInitMulti(otInstance **aInstances, uint8_t count);
 
 #if OPENTHREAD_CONFIG_HEAP_EXTERNAL_ENABLE
 OT_TOOL_WEAK void *otPlatCAlloc(size_t aNum, size_t aSize) { return calloc(aNum, aSize); }
@@ -70,7 +81,9 @@ int main(int argc, char *argv[])
     prctl(PR_SET_PDEATHSIG, SIGHUP);
 #endif
 
-#if OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
+#if OPENTHREAD_CONFIG_MULTIPAN_RCP_ENABLE
+    otInstance *instances[ENDPOINT_CT] = {NULL};
+#elif OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
     size_t   otInstanceBufferLength = 0;
     uint8_t *otInstanceBuffer       = NULL;
 #endif
@@ -79,7 +92,16 @@ pseudo_reset:
 
     otSysInit(argc, argv);
 
-#if OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
+#if OPENTHREAD_CONFIG_MULTIPAN_RCP_ENABLE
+    for (int i = 0; i < ENDPOINT_CT; i++)
+    {
+        instances[i] = otInstanceInitMultiple(i);
+
+        assert(instances[i]);
+    }
+    instance = instances[0];
+#elif OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
+
     // Call to query the buffer size
     (void)otInstanceInit(NULL, &otInstanceBufferLength);
 
@@ -94,7 +116,11 @@ pseudo_reset:
 #endif
     assert(instance);
 
+#if OPENTHREAD_CONFIG_MULTIPAN_RCP_ENABLE
+    otAppNcpInitMulti(instances, ENDPOINT_CT);
+#else
     otAppNcpInit(instance);
+#endif
 
     while (!otSysPseudoResetWasRequested())
     {
@@ -103,7 +129,7 @@ pseudo_reset:
     }
 
     otInstanceFinalize(instance);
-#if OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
+#if OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE && !OPENTHREAD_CONFIG_MULTIPAN_RCP_ENABLE
     free(otInstanceBuffer);
 #endif
 

examples/apps/ncp/ncp.c

@@ -61,4 +61,17 @@ void otAppNcpInit(otInstance *aInstance)
     otNcpHdlcInit(aInstance, NcpSend);
 #endif
 }
+
+#if OPENTHREAD_CONFIG_MULTIPAN_RCP_ENABLE
+void otAppNcpInitMulti(otInstance **aInstances, uint8_t aCount)
+{
+#if OPENTHREAD_CONFIG_NCP_SPI_ENABLE
+#error Multipan support not implemented for SPI
+#else
+    IgnoreError(otPlatUartEnable());
+
+    otNcpHdlcInitMulti(aInstances, aCount, NcpSend);
+#endif
+}
+#endif
 #endif // !OPENTHREAD_ENABLE_NCP_VENDOR_HOOK