[ncp] add initial support of NCP

src/ncp/CMakeLists.txt

@@ -29,6 +29,8 @@
 add_library(otbr-ncp
     ncp_host.cpp
     ncp_host.hpp
+    ncp_spinel.cpp
+    ncp_spinel.hpp
     rcp_host.cpp
     rcp_host.hpp
     thread_host.cpp

src/ncp/ncp_host.cpp

@@ -57,17 +57,18 @@ const char *NcpHost::GetCoprocessorVersion(void)
 void NcpHost::Init(void)
 {
     otSysInit(&mConfig);
+    mNcpSpinel.Init(&mSpinelDriver);
 }
 
 void NcpHost::Deinit(void)
 {
+    mNcpSpinel.Deinit();
     otSysDeinit();
 }
 
 void NcpHost::GetDeviceRole(DeviceRoleHandler aHandler)
 {
-    // TODO: Implement the API with NCP Spinel
-    aHandler(OT_ERROR_NOT_IMPLEMENTED, OT_DEVICE_ROLE_DISABLED);
+    mNcpSpinel.GetDeviceRole(aHandler);
 }
 
 void NcpHost::Process(const MainloopContext &aMainloop)

src/ncp/ncp_host.hpp

@@ -38,6 +38,7 @@
 #include "lib/spinel/spinel_driver.hpp"
 
 #include "common/mainloop.hpp"
+#include "ncp/ncp_spinel.hpp"
 #include "ncp/thread_host.hpp"
 
 namespace otbr {
@@ -76,6 +77,7 @@ class NcpHost : public MainloopProcessor, public ThreadHost
 private:
     ot::Spinel::SpinelDriver &mSpinelDriver;
     otPlatformConfig          mConfig;
+    NcpSpinel                 mNcpSpinel;
 };
 
 } // namespace Ncp

src/ncp/ncp_spinel.cpp

@@ -0,0 +1,273 @@
+/*
+ *  Copyright (c) 2024, The OpenThread Authors.
+ *  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions are met:
+ *  1. Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *  3. Neither the name of the copyright holder nor the
+ *     names of its contributors may be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *  POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#define OTBR_LOG_TAG "NcpSpinel"
+
+#include "ncp_spinel.hpp"
+
+#include <stdarg.h>
+
+#include <openthread/thread.h>
+
+#include "common/code_utils.hpp"
+#include "common/logging.hpp"
+#include "lib/spinel/spinel.h"
+#include "lib/spinel/spinel_driver.hpp"
+
+namespace otbr {
+namespace Ncp {
+
+NcpSpinel::NcpSpinel(void)
+    : mSpinelDriver(nullptr)
+    , mCmdTidsInUse(0)
+    , mCmdNextTid(1)
+    , mDeviceRole(OT_DEVICE_ROLE_DISABLED)
+    , mGetDeviceRoleHandler(nullptr)
+{
+    memset(mWaitingKeyTable, 0xff, sizeof(mWaitingKeyTable));
+}
+
+NcpSpinel::~NcpSpinel(void) = default;
+
+void NcpSpinel::Init(ot::Spinel::SpinelDriver *aSpinelDriver)
+{
+    mSpinelDriver = aSpinelDriver;
+    mSpinelDriver->SetFrameHandler(&HandleReceivedFrame, &HandleSavedFrame, this);
+}
+
+void NcpSpinel::Deinit(void)
+{
+    mSpinelDriver = nullptr;
+}
+
+void NcpSpinel::GetDeviceRole(GetDeviceRoleHandler aHandler)
+{
+    otError      error = OT_ERROR_NONE;
+    spinel_tid_t tid   = GetNextTid();
+    va_list      args;
+
+    error = mSpinelDriver->SendCommand(SPINEL_CMD_PROP_VALUE_GET, SPINEL_PROP_NET_ROLE, tid, nullptr, args);
+    if (error != OT_ERROR_NONE)
+    {
+        FreeTid(tid);
+        aHandler(error, OT_DEVICE_ROLE_DISABLED);
+    }
+    mWaitingKeyTable[tid] = SPINEL_PROP_NET_ROLE;
+
+    mGetDeviceRoleHandler = aHandler;
+
+    return;
+}
+
+void NcpSpinel::HandleReceivedFrame(const uint8_t *aFrame,
+                                    uint16_t       aLength,
+                                    uint8_t        aHeader,
+                                    bool          &aSave,
+                                    void          *aContext)
+{
+    static_cast<NcpSpinel *>(aContext)->HandleReceivedFrame(aFrame, aLength, aHeader, aSave);
+}
+
+void NcpSpinel::HandleReceivedFrame(const uint8_t *aFrame, uint16_t aLength, uint8_t aHeader, bool &aShouldSaveFrame)
+{
+    spinel_tid_t tid = SPINEL_HEADER_GET_TID(aHeader);
+
+    if (tid == 0)
+    {
+        HandleNotification(aFrame, aLength);
+    }
+    else if (tid < kMaxTids)
+    {
+        HandleResponse(tid, aFrame, aLength);
+    }
+    else
+    {
+        otbrLogCrit("Received unexpected tid: %u", tid);
+    }
+
+    aShouldSaveFrame = false;
+}
+
+void NcpSpinel::HandleSavedFrame(const uint8_t *aFrame, uint16_t aLength, void *aContext)
+{
+    OT_UNUSED_VARIABLE(aFrame);
+    OT_UNUSED_VARIABLE(aLength);
+    OT_UNUSED_VARIABLE(aContext);
+}
+
+void NcpSpinel::HandleNotification(const uint8_t *aFrame, uint16_t aLength)
+{
+    spinel_prop_key_t key;
+    spinel_size_t     len = 0;
+    spinel_ssize_t    unpacked;
+    uint8_t          *data = nullptr;
+    uint32_t          cmd;
+    uint8_t           header;
+    otbrError         error = OTBR_ERROR_NONE;
+
+    unpacked = spinel_datatype_unpack(aFrame, aLength, "CiiD", &header, &cmd, &key, &data, &len);
+    VerifyOrExit(unpacked > 0, error = OTBR_ERROR_PARSE);
+    VerifyOrExit(SPINEL_HEADER_GET_TID(header) == 0, error = OTBR_ERROR_PARSE);
+    VerifyOrExit(cmd == SPINEL_CMD_PROP_VALUE_IS);
+    HandleValueIs(key, data, static_cast<uint16_t>(len));
+
+exit:
+    if (error != OTBR_ERROR_NONE)
+    {
+        otbrLogResult(error, "HandleNotification: %s", __FUNCTION__);
+    }
+}
+
+void NcpSpinel::HandleResponse(spinel_tid_t aTid, const uint8_t *aFrame, uint16_t aLength)
+{
+    spinel_prop_key_t key;
+    spinel_size_t     len = 0;
+    spinel_ssize_t    unpacked;
+    uint8_t          *data = nullptr;
+    uint32_t          cmd;
+    uint8_t           header;
+    otError           error = OT_ERROR_NONE;
+
+    unpacked = spinel_datatype_unpack(aFrame, aLength, "CiiD", &header, &cmd, &key, &data, &len);
+    VerifyOrExit(unpacked > 0, error = OT_ERROR_PARSE);
+
+    VerifyOrExit(cmd == SPINEL_CMD_PROP_VALUE_IS && key == mWaitingKeyTable[aTid], error = OT_ERROR_INVALID_STATE);
+
+    if (key == SPINEL_PROP_NET_ROLE)
+    {
+        spinel_net_role_t spinelRole;
+        otDeviceRole      role;
+        unpacked = spinel_datatype_unpack(data, len, "i", &spinelRole);
+
+        switch (spinelRole)
+        {
+        case SPINEL_NET_ROLE_DISABLED:
+            role = OT_DEVICE_ROLE_DISABLED;
+            break;
+        case SPINEL_NET_ROLE_DETACHED:
+            role = OT_DEVICE_ROLE_DETACHED;
+            break;
+        case SPINEL_NET_ROLE_CHILD:
+            role = OT_DEVICE_ROLE_CHILD;
+            break;
+        case SPINEL_NET_ROLE_ROUTER:
+            role = OT_DEVICE_ROLE_ROUTER;
+            break;
+        case SPINEL_NET_ROLE_LEADER:
+            role = OT_DEVICE_ROLE_LEADER;
+            break;
+        }
+
+        if (mGetDeviceRoleHandler)
+        {
+            mGetDeviceRoleHandler(error, role);
+        }
+    }
+
+exit:
+    if (error == OT_ERROR_INVALID_STATE)
+    {
+        otbrLogCrit("Received unexpected response with cmd:%u, key:%u, waiting key:%u for tid:%u", cmd, key,
+                    mWaitingKeyTable[aTid], aTid);
+    }
+}
+
+void NcpSpinel::HandleValueIs(spinel_prop_key_t aKey, const uint8_t *aBuffer, uint16_t aLength)
+{
+    otbrError      error = OTBR_ERROR_NONE;
+    spinel_ssize_t unpacked;
+
+    if (aKey == SPINEL_PROP_LAST_STATUS)
+    {
+        spinel_status_t status = SPINEL_STATUS_OK;
+
+        unpacked = spinel_datatype_unpack(aBuffer, aLength, "i", &status);
+        VerifyOrExit(unpacked > 0, error = OTBR_ERROR_PARSE);
+
+        otbrLogInfo("NCP last status: %s", spinel_status_to_cstr(status));
+    }
+    else if (aKey == SPINEL_PROP_NET_ROLE)
+    {
+        spinel_net_role_t role;
+
+        unpacked = spinel_datatype_unpack(aBuffer, aLength, "C", &role);
+        VerifyOrExit(unpacked > 0, error = OTBR_ERROR_PARSE);
+
+        switch (role)
+        {
+        case SPINEL_NET_ROLE_DETACHED:
+            mDeviceRole = OT_DEVICE_ROLE_DETACHED;
+            break;
+        case SPINEL_NET_ROLE_CHILD:
+            mDeviceRole = OT_DEVICE_ROLE_CHILD;
+            break;
+        case SPINEL_NET_ROLE_ROUTER:
+            mDeviceRole = OT_DEVICE_ROLE_ROUTER;
+            break;
+        case SPINEL_NET_ROLE_LEADER:
+            mDeviceRole = OT_DEVICE_ROLE_LEADER;
+            break;
+        case SPINEL_NET_ROLE_DISABLED:
+            mDeviceRole = OT_DEVICE_ROLE_DISABLED;
+            break;
+        }
+
+        otbrLogInfo("Device role changed to %s", otThreadDeviceRoleToString(mDeviceRole));
+    }
+
+exit:
+    otbrLogResult(error, "NcpSpinel: %s", __FUNCTION__);
+    return;
+}
+
+spinel_tid_t NcpSpinel::GetNextTid(void)
+{
+    spinel_tid_t tid = mCmdNextTid;
+
+    while (((1 << tid) & mCmdTidsInUse) != 0)
+    {
+        tid = SPINEL_GET_NEXT_TID(tid);
+
+        if (tid == mCmdNextTid)
+        {
+            // We looped back to `mCmdNextTid` indicating that all
+            // TIDs are in-use.
+
+            ExitNow(tid = 0);
+        }
+    }
+
+    mCmdTidsInUse |= (1 << tid);
+    mCmdNextTid = SPINEL_GET_NEXT_TID(tid);
+
+exit:
+    return tid;
+}
+
+} // namespace Ncp
+} // namespace otbr