moved logic to the port class

also implemented the state machine for CP port

8 files changed, 468 insertions, 106 deletions

diff --git a/scripts/automation/trex_control_plane/console/trex_console.py b/scripts/automation/trex_control_plane/console/trex_console.py
index a2c738ab..68050fc0 100755
--- a/scripts/automation/trex_control_plane/console/trex_console.py
+++ b/scripts/automation/trex_control_plane/console/trex_console.py
@@ -778,6 +778,9 @@ class TRexConsole(cmd.Cmd):
                 return
             else:
                 port_list = self.stateless_client.get_active_ports()
+                if not port_list:
+                     print magenta("no active ports - operation aborted\n")
+                     return
         else:
             port_list = self.extract_port_ids_from_line(line)
 
diff --git a/src/gtest/rpc_test.cpp b/src/gtest/rpc_test.cpp
index 6b8e3eff..34bb02a8 100644
--- a/src/gtest/rpc_test.cpp
+++ b/src/gtest/rpc_test.cpp
@@ -478,6 +478,7 @@ TEST_F(RpcTestOwned, add_remove_stream) {
     create_request(request, "get_stream", 1, 1);
 
     request["params"]["stream_id"] = 5;
+    request["params"]["get_pkt"] = true;
 
     send_request(request, response);
 
@@ -501,6 +502,7 @@ TEST_F(RpcTestOwned, add_remove_stream) {
     create_request(request, "get_stream", 1, 1);
 
     request["params"]["stream_id"] = 5;
+    request["params"]["get_pkt"] = true;
 
     send_request(request, response);
 
@@ -607,17 +609,21 @@ TEST_F(RpcTestOwned, start_stop_traffic) {
 
     /* start port 1 */
     create_request(request, "start_traffic", 1, 1);
+    request["params"]["mul"] = 1.0;
     send_request(request, response);
+
     EXPECT_EQ(response["result"], "ACK");
 
 
     /* start port 3 */
     create_request(request, "start_traffic", 1, 3);
+    request["params"]["mul"] = 1.0;
     send_request(request, response);
     EXPECT_EQ(response["result"], "ACK");
 
     /* start not configured port */
     create_request(request, "start_traffic", 1, 2);
+    request["params"]["mul"] = 1.0;
     send_request(request, response);
     EXPECT_EQ(response["error"]["code"], -32000);
 
@@ -633,11 +639,13 @@ TEST_F(RpcTestOwned, start_stop_traffic) {
 
     /* start 1 again */
     create_request(request, "start_traffic", 1, 1);
+    request["params"]["mul"] = 1.0;
     send_request(request, response);
     EXPECT_EQ(response["result"], "ACK");
 
     /* start 1 twice (error) */
     create_request(request, "start_traffic", 1, 1);
+    request["params"]["mul"] = 1.0;
     send_request(request, response);
     EXPECT_EQ(response["error"]["code"], -32000);
 
@@ -657,3 +665,96 @@ TEST_F(RpcTestOwned, start_stop_traffic) {
     EXPECT_EQ(response["result"], "ACK");
 }
 
+
+
+TEST_F(RpcTestOwned, states_check) {
+    Json::Value request;
+    Json::Value response;
+
+    /* add stream #1 */
+    create_request(request, "add_stream", 1, 1);
+    request["params"]["stream_id"] = 5;
+
+    Json::Value stream;
+    create_simple_stream(stream);
+
+    request["params"]["stream"] = stream;
+    
+    send_request(request, response);
+    EXPECT_EQ(response["result"], "ACK");
+
+    /* start traffic */
+    create_request(request, "start_traffic", 1, 1);
+    request["params"]["mul"] = 1.0;
+    send_request(request, response);
+    EXPECT_EQ(response["result"], "ACK");
+
+    /* now we cannot add streams */
+    create_request(request, "add_stream", 1, 1);
+    request["params"]["stream_id"] = 15;
+
+    create_simple_stream(stream);
+
+    request["params"]["stream"] = stream;
+    
+    send_request(request, response);
+    EXPECT_EQ(response["error"]["code"], -32000);
+
+    /* we cannot remove streams */
+    create_request(request, "remove_stream", 1, 1);
+    request["params"]["stream_id"] = 15;
+    send_request(request, response);
+    EXPECT_EQ(response["error"]["code"], -32000);
+
+    /* cannot start again */
+    create_request(request, "start_traffic", 1, 1);
+    request["params"]["mul"] = 1.0;
+    send_request(request, response);
+    EXPECT_EQ(response["error"]["code"], -32000);
+
+    /* we can stop and add stream / remove */
+
+    create_request(request, "stop_traffic", 1, 1);
+    send_request(request, response);
+    EXPECT_EQ(response["result"], "ACK");
+
+    create_request(request, "add_stream", 1, 1);
+    request["params"]["stream_id"] = 328;
+
+    create_simple_stream(stream);
+
+    request["params"]["stream"] = stream;
+
+    send_request(request, response);
+    EXPECT_EQ(response["result"], "ACK");
+
+
+    create_request(request, "remove_stream", 1, 1);
+    request["params"]["stream_id"] = 15;
+    send_request(request, response);
+    EXPECT_EQ(response["error"]["code"], -32000);
+
+    /* we cannot pause now */
+    create_request(request, "pause_traffic", 1, 1);
+    send_request(request, response);
+    EXPECT_EQ(response["error"]["code"], -32000);
+
+
+    /* start */
+    create_request(request, "start_traffic", 1, 1);
+    request["params"]["mul"] = 1.0;
+    send_request(request, response);
+    EXPECT_EQ(response["result"], "ACK");
+
+    /* now can pause */
+    create_request(request, "pause_traffic", 1, 1);
+    send_request(request, response);
+    EXPECT_EQ(response["result"], "ACK");
+
+    /* also we can resume*/
+    create_request(request, "resume_traffic", 1, 1);
+    send_request(request, response);
+    EXPECT_EQ(response["result"], "ACK");
+
+
+}
diff --git a/src/rpc-server/commands/trex_rpc_cmd_general.cpp b/src/rpc-server/commands/trex_rpc_cmd_general.cpp
index b40e996f..b6d06cfc 100644
--- a/src/rpc-server/commands/trex_rpc_cmd_general.cpp
+++ b/src/rpc-server/commands/trex_rpc_cmd_general.cpp
@@ -222,12 +222,12 @@ TrexRpcCmdAcquire::_run(const Json::Value &params, Json::Value &result) {
     /* if not free and not you and not force - fail */
     TrexStatelessPort *port = get_stateless_obj()->get_port_by_id(port_id);
 
-    if ( (!port->is_free_to_aquire()) && (port->get_owner() != new_owner) && (!force)) {
-        generate_execute_err(result, "port is already taken by '" + port->get_owner() + "'");
+    try {
+        port->acquire(new_owner, force);
+    } catch (const TrexRpcException &ex) {
+        generate_execute_err(result, ex.what());
     }
 
-    port->set_owner(new_owner);
-
     result["result"] = port->get_owner_handler();
 
     return (TREX_RPC_CMD_OK);
@@ -244,12 +244,12 @@ TrexRpcCmdRelease::_run(const Json::Value &params, Json::Value &result) {
 
     TrexStatelessPort *port = get_stateless_obj()->get_port_by_id(port_id);
 
-    if (port->get_state() == TrexStatelessPort::PORT_STATE_TRANSMITTING) {
-        generate_execute_err(result, "cannot release a port during transmission");
+    try {
+        port->release();
+    } catch (const TrexRpcException &ex) {
+        generate_execute_err(result, ex.what());
     }
 
-    port->clear_owner();
-
     result["result"] = "ACK";
 
     return (TREX_RPC_CMD_OK);
@@ -266,13 +266,13 @@ TrexRpcCmdGetPortStats::_run(const Json::Value &params, Json::Value &result) {
 
     TrexStatelessPort *port = get_stateless_obj()->get_port_by_id(port_id);
 
-    if (port->get_state() == TrexStatelessPort::PORT_STATE_DOWN) {
-        generate_execute_err(result, "cannot get stats - port is down");
-    }
-
     result["result"]["status"] = port->get_state_as_string();
 
-    port->encode_stats(result["result"]);
+    try {
+        port->encode_stats(result["result"]);
+    } catch (const TrexRpcException &ex) {
+        generate_execute_err(result, ex.what());
+    }
 
     return (TREX_RPC_CMD_OK);
 }
@@ -303,7 +303,7 @@ TrexRpcCmdSyncUser::_run(const Json::Value &params, Json::Value &result) {
                 owned_port["streams"] = Json::arrayValue;
 
                 std::vector <TrexStream *> streams;
-                port->get_stream_table()->get_object_list(streams);
+                port->get_object_list(streams);
 
                 for (auto stream : streams) {
                     owned_port["streams"].append(stream->get_stream_json());
diff --git a/src/rpc-server/commands/trex_rpc_cmd_stream.cpp b/src/rpc-server/commands/trex_rpc_cmd_stream.cpp
index 4fa0956d..fffc800a 100644
--- a/src/rpc-server/commands/trex_rpc_cmd_stream.cpp
+++ b/src/rpc-server/commands/trex_rpc_cmd_stream.cpp
@@ -115,7 +115,12 @@ TrexRpcCmdAddStream::_run(const Json::Value &params, Json::Value &result) {
     validate_stream(stream, result);
 
     TrexStatelessPort *port = get_stateless_obj()->get_port_by_id(stream->m_port_id);
-    port->get_stream_table()->add_stream(stream);
+
+    try {
+        port->add_stream(stream);
+    } catch (const TrexRpcException &ex) {
+        generate_execute_err(result, ex.what());
+    }
 
     result["result"] = "ACK";
 
@@ -293,7 +298,7 @@ TrexRpcCmdAddStream::validate_stream(const TrexStream *stream, Json::Value &resu
     TrexStatelessPort * port = get_stateless_obj()->get_port_by_id(stream->m_port_id);
 
     /* does such a stream exists ? */
-    if (port->get_stream_table()->get_stream_by_id(stream->m_stream_id)) {
+    if (port->get_stream_by_id(stream->m_stream_id)) {
         std::stringstream ss;
         ss << "stream " << stream->m_stream_id << " already exists";
         delete stream;
@@ -319,7 +324,7 @@ TrexRpcCmdRemoveStream::_run(const Json::Value &params, Json::Value &result) {
     }
 
     TrexStatelessPort *port = get_stateless_obj()->get_port_by_id(port_id);
-    TrexStream *stream = port->get_stream_table()->get_stream_by_id(stream_id);
+    TrexStream *stream = port->get_stream_by_id(stream_id);
 
     if (!stream) {
         std::stringstream ss;
@@ -327,7 +332,12 @@ TrexRpcCmdRemoveStream::_run(const Json::Value &params, Json::Value &result) {
         generate_execute_err(result, ss.str());
     }
 
-    port->get_stream_table()->remove_stream(stream);
+    try {
+        port->remove_stream(stream);
+    } catch (const TrexRpcException &ex) {
+        generate_execute_err(result, ex.what());
+    }
+    
     delete stream;
 
     result["result"] = "ACK";
@@ -350,12 +360,18 @@ TrexRpcCmdRemoveAllStreams::_run(const Json::Value &params, Json::Value &result)
         generate_execute_err(result, ss.str());
     }
 
-       TrexStatelessPort *port = get_stateless_obj()->get_port_by_id(port_id);
-       port->get_stream_table()->remove_and_delete_all_streams();
+    TrexStatelessPort *port = get_stateless_obj()->get_port_by_id(port_id);
 
-       result["result"] = "ACK";
+    try {
+        port->remove_and_delete_all_streams();
+    } catch (const TrexRpcException &ex) {
+        generate_execute_err(result, ex.what());
+    }
 
-       return (TREX_RPC_CMD_OK);
+
+    result["result"] = "ACK";
+
+    return (TREX_RPC_CMD_OK);
 }
 
 /***************************
@@ -377,7 +393,7 @@ TrexRpcCmdGetStreamList::_run(const Json::Value &params, Json::Value &result) {
 
        TrexStatelessPort *port = get_stateless_obj()->get_port_by_id(port_id);
 
-       port->get_stream_table()->get_id_list(stream_list);
+       port->get_id_list(stream_list);
 
        Json::Value json_list = Json::arrayValue;
 
@@ -409,7 +425,7 @@ TrexRpcCmdGetStream::_run(const Json::Value &params, Json::Value &result) {
 
     TrexStatelessPort *port = get_stateless_obj()->get_port_by_id(port_id);
 
-    TrexStream *stream = port->get_stream_table()->get_stream_by_id(stream_id);
+    TrexStream *stream = port->get_stream_by_id(stream_id);
 
     if (!stream) {
         std::stringstream ss;
@@ -447,32 +463,19 @@ TrexRpcCmdStartTraffic::_run(const Json::Value &params, Json::Value &result) {
 
     TrexStatelessPort *port = get_stateless_obj()->get_port_by_id(port_id);
 
-    TrexStatelessPort::rc_e rc = port->start_traffic(mul);
-
-    if (rc == TrexStatelessPort::RC_OK) {
-        result["result"] = "ACK";
-    } else {
-        std::stringstream ss;
-        switch (rc) {
-        case TrexStatelessPort::RC_ERR_BAD_STATE_FOR_OP:
-            ss << "bad state for operations: port is either transmitting traffic or down";
-            break;
-        case TrexStatelessPort::RC_ERR_NO_STREAMS:
-            ss << "no active streams on that port";
-            break;
-        default:
-            ss << "failed to start traffic";
-            break;
-        }
-
-        generate_execute_err(result, ss.str());
+    try {
+        port->start_traffic(mul);
+    } catch (const TrexRpcException &ex) {
+        generate_execute_err(result, ex.what());
     }
 
-   return (TREX_RPC_CMD_OK);
+    result["result"] = "ACK";
+
+    return (TREX_RPC_CMD_OK);
 }
 
 /***************************
- * start traffic on port
+ * stop traffic on port
  * 
  **************************/
 trex_rpc_cmd_rc_e
@@ -487,7 +490,12 @@ TrexRpcCmdStopTraffic::_run(const Json::Value &params, Json::Value &result) {
 
     TrexStatelessPort *port = get_stateless_obj()->get_port_by_id(port_id);
 
-    port->stop_traffic();
+    try {
+        port->stop_traffic();
+    } catch (const TrexRpcException &ex) {
+        generate_execute_err(result, ex.what());
+    }
+
     result["result"] = "ACK";
 
     return (TREX_RPC_CMD_OK);
@@ -511,7 +519,7 @@ TrexRpcCmdGetAllStreams::_run(const Json::Value &params, Json::Value &result) {
     TrexStatelessPort *port = get_stateless_obj()->get_port_by_id(port_id);
 
     std::vector <TrexStream *> streams;
-    port->get_stream_table()->get_object_list(streams);
+    port->get_object_list(streams);
 
     Json::Value streams_json = Json::objectValue;
     for (auto stream : streams) {
@@ -533,3 +541,89 @@ TrexRpcCmdGetAllStreams::_run(const Json::Value &params, Json::Value &result) {
 
     return (TREX_RPC_CMD_OK);
 }
+
+/***************************
+ * pause traffic
+ * 
+ **************************/
+trex_rpc_cmd_rc_e
+TrexRpcCmdPauseTraffic::_run(const Json::Value &params, Json::Value &result) {
+
+    uint8_t port_id = parse_byte(params, "port_id", result);
+
+    if (port_id >= get_stateless_obj()->get_port_count()) {
+        std::stringstream ss;
+        ss << "invalid port id - should be between 0 and " << (int)get_stateless_obj()->get_port_count() - 1;
+        generate_execute_err(result, ss.str());
+    }
+
+    TrexStatelessPort *port = get_stateless_obj()->get_port_by_id(port_id);
+
+     try {
+        port->pause_traffic();
+    } catch (const TrexRpcException &ex) {
+        generate_execute_err(result, ex.what());
+    }
+
+    result["result"] = "ACK";
+
+    return (TREX_RPC_CMD_OK);
+}
+
+/***************************
+ * resume traffic
+ * 
+ **************************/
+trex_rpc_cmd_rc_e
+TrexRpcCmdResumeTraffic::_run(const Json::Value &params, Json::Value &result) {
+
+    uint8_t port_id = parse_byte(params, "port_id", result);
+
+    if (port_id >= get_stateless_obj()->get_port_count()) {
+        std::stringstream ss;
+        ss << "invalid port id - should be between 0 and " << (int)get_stateless_obj()->get_port_count() - 1;
+        generate_execute_err(result, ss.str());
+    }
+
+    TrexStatelessPort *port = get_stateless_obj()->get_port_by_id(port_id);
+
+     try {
+        port->resume_traffic();
+    } catch (const TrexRpcException &ex) {
+        generate_execute_err(result, ex.what());
+    }
+
+    result["result"] = "ACK";
+
+    return (TREX_RPC_CMD_OK);
+}
+
+/***************************
+ * update traffic
+ * 
+ **************************/
+trex_rpc_cmd_rc_e
+TrexRpcCmdUpdateTraffic::_run(const Json::Value &params, Json::Value &result) {
+
+    uint8_t port_id = parse_byte(params, "port_id", result);
+    double mul = parse_double(params, "mul", result);
+
+    if (port_id >= get_stateless_obj()->get_port_count()) {
+        std::stringstream ss;
+        ss << "invalid port id - should be between 0 and " << (int)get_stateless_obj()->get_port_count() - 1;
+        generate_execute_err(result, ss.str());
+    }
+
+    TrexStatelessPort *port = get_stateless_obj()->get_port_by_id(port_id);
+
+    try {
+        port->update_traffic(mul);
+    } catch (const TrexRpcException &ex) {
+        generate_execute_err(result, ex.what());
+    }
+
+    result["result"] = "ACK";
+
+    return (TREX_RPC_CMD_OK);
+}
+
diff --git a/src/rpc-server/commands/trex_rpc_cmds.h b/src/rpc-server/commands/trex_rpc_cmds.h
index a604d9a1..8b173cb9 100644
--- a/src/rpc-server/commands/trex_rpc_cmds.h
+++ b/src/rpc-server/commands/trex_rpc_cmds.h
@@ -105,8 +105,12 @@ TREX_RPC_CMD_DEFINE(TrexRpcCmdGetStream, "get_stream", 3, true);
 
 
 
-TREX_RPC_CMD_DEFINE(TrexRpcCmdStartTraffic, "start_traffic", 2, true);
-TREX_RPC_CMD_DEFINE(TrexRpcCmdStopTraffic, "stop_traffic", 1, true);
+TREX_RPC_CMD_DEFINE(TrexRpcCmdStartTraffic,  "start_traffic", 2, true);
+TREX_RPC_CMD_DEFINE(TrexRpcCmdStopTraffic,   "stop_traffic", 1, true);
+TREX_RPC_CMD_DEFINE(TrexRpcCmdPauseTraffic,  "pause_traffic", 1, true);
+TREX_RPC_CMD_DEFINE(TrexRpcCmdResumeTraffic, "resume_traffic", 1, true);
+
+TREX_RPC_CMD_DEFINE(TrexRpcCmdUpdateTraffic, "update_traffic", 1, true);
 
 TREX_RPC_CMD_DEFINE(TrexRpcCmdSyncUser, "sync_user", 2, false);
 
diff --git a/src/rpc-server/trex_rpc_cmds_table.cpp b/src/rpc-server/trex_rpc_cmds_table.cpp
index e3bd7848..f38b4df4 100644
--- a/src/rpc-server/trex_rpc_cmds_table.cpp
+++ b/src/rpc-server/trex_rpc_cmds_table.cpp
@@ -51,8 +51,11 @@ TrexRpcCommandsTable::TrexRpcCommandsTable() {
     register_command(new TrexRpcCmdGetStreamList());
     register_command(new TrexRpcCmdGetStream());
     register_command(new TrexRpcCmdGetAllStreams());
+
     register_command(new TrexRpcCmdStartTraffic());
     register_command(new TrexRpcCmdStopTraffic());
+    register_command(new TrexRpcCmdPauseTraffic());
+    register_command(new TrexRpcCmdResumeTraffic());
 }
 
 TrexRpcCommandsTable::~TrexRpcCommandsTable() {
diff --git a/src/stateless/cp/trex_stateless_port.cpp b/src/stateless/cp/trex_stateless_port.cpp
index cb6fcc0e..b9206775 100644
--- a/src/stateless/cp/trex_stateless_port.cpp
+++ b/src/stateless/cp/trex_stateless_port.cpp
@@ -53,29 +53,47 @@ using namespace std;
  * 
  **************************/
 TrexStatelessPort::TrexStatelessPort(uint8_t port_id) : m_port_id(port_id) {
-    m_port_state = PORT_STATE_UP_IDLE;
+    m_port_state = PORT_STATE_IDLE;
     clear_owner();
 }
 
 
 /**
+ * acquire the port
+ * 
+ * @author imarom (09-Nov-15)
+ * 
+ * @param user 
+ * @param force 
+ */
+void 
+TrexStatelessPort::acquire(const std::string &user, bool force) {
+    if ( (!is_free_to_aquire()) && (get_owner() != user) && (!force)) {
+        throw TrexRpcException("port is already taken by '" + get_owner() + "'");
+    }
+
+    set_owner(user);
+}
+
+void
+TrexStatelessPort::release(void) {
+    verify_state( ~(PORT_STATE_TX | PORT_STATE_PAUSE) );
+    clear_owner();
+}
+
+/**
  * starts the traffic on the port
  * 
  */
-TrexStatelessPort::rc_e
+void
 TrexStatelessPort::start_traffic(double mul) {
 
-    if (m_port_state != PORT_STATE_UP_IDLE) {
-        return (RC_ERR_BAD_STATE_FOR_OP);
-    }
-
-    if (get_stream_table()->size() == 0) {
-        return (RC_ERR_NO_STREAMS);
-    }
+    /* command allowed only on state stream */
+    verify_state(PORT_STATE_STREAMS);
 
     /* fetch all the streams from the table */
     vector<TrexStream *> streams;
-    get_stream_table()->get_object_list(streams);
+    get_object_list(streams);
 
     /* compiler it */
     TrexStreamsCompiler compiler;
@@ -83,7 +101,7 @@ TrexStatelessPort::start_traffic(double mul) {
 
     bool rc = compiler.compile(streams, *compiled_obj);
     if (!rc) {
-        return (RC_ERR_FAILED_TO_COMPILE_STREAMS);
+        throw TrexRpcException("Failed to compile streams");
     }
 
     /* generate a message to all the relevant DP cores to start transmitting */
@@ -91,51 +109,94 @@ TrexStatelessPort::start_traffic(double mul) {
 
     send_message_to_dp(start_msg);
 
-    /* move the state to transmiting */
-    m_port_state = PORT_STATE_TRANSMITTING;
-
-    return (RC_OK);
+    change_state(PORT_STATE_TX);
 }
 
-TrexStatelessPort::rc_e
+/**
+ * stop traffic on port
+ * 
+ * @author imarom (09-Nov-15)
+ * 
+ * @return TrexStatelessPort::rc_e 
+ */
+void
 TrexStatelessPort::stop_traffic(void) {
 
-    /* real code goes here */
-    if (m_port_state != PORT_STATE_TRANSMITTING) {
-        return (RC_ERR_BAD_STATE_FOR_OP);
-    }
+    verify_state(PORT_STATE_TX);
 
     /* generate a message to all the relevant DP cores to start transmitting */
     TrexStatelessCpToDpMsgBase *stop_msg = new TrexStatelessDpStop(m_port_id);
 
     send_message_to_dp(stop_msg);
 
-    m_port_state = PORT_STATE_UP_IDLE;
+    change_state(PORT_STATE_STREAMS);
+}
+
+void
+TrexStatelessPort::pause_traffic(void) {
+
+    verify_state(PORT_STATE_TX);
+
+    #if 0
+    /* generate a message to all the relevant DP cores to start transmitting */
+    TrexStatelessCpToDpMsgBase *stop_msg = new TrexStatelessDpStop(m_port_id);
 
-    return (RC_OK);
+    send_message_to_dp(stop_msg);
+
+    m_port_state = PORT_STATE_UP_IDLE;
+    #endif
+    change_state(PORT_STATE_PAUSE);
 }
 
-/**
-* access the stream table
-* 
-*/
-TrexStreamTable * TrexStatelessPort::get_stream_table() {
-    return &m_stream_table;
+void
+TrexStatelessPort::resume_traffic(void) {
+
+    verify_state(PORT_STATE_PAUSE);
+
+    #if 0
+    /* generate a message to all the relevant DP cores to start transmitting */
+    TrexStatelessCpToDpMsgBase *stop_msg = new TrexStatelessDpStop(m_port_id);
+
+    send_message_to_dp(stop_msg);
+
+    m_port_state = PORT_STATE_UP_IDLE;
+    #endif
+    change_state(PORT_STATE_TX);
 }
 
+void
+TrexStatelessPort::update_traffic(double mul) {
+
+    verify_state(PORT_STATE_STREAMS | PORT_STATE_TX | PORT_STATE_PAUSE);
+
+    #if 0
+    /* generate a message to all the relevant DP cores to start transmitting */
+    TrexStatelessCpToDpMsgBase *stop_msg = new TrexStatelessDpStop(m_port_id);
+
+    send_message_to_dp(stop_msg);
+
+    m_port_state = PORT_STATE_UP_IDLE;
+    #endif
+}
 
 std::string 
-TrexStatelessPort::get_state_as_string() {
+TrexStatelessPort::get_state_as_string() const {
 
     switch (get_state()) {
     case PORT_STATE_DOWN:
         return "down";
 
-    case PORT_STATE_UP_IDLE:
-        return  "idle";
+    case PORT_STATE_IDLE:
+        return  "no streams";
+
+    case PORT_STATE_STREAMS:
+        return "with streams, idle";
 
-    case PORT_STATE_TRANSMITTING:
+    case PORT_STATE_TX:
         return "transmitting";
+
+    case PORT_STATE_PAUSE:
+        return "paused";
     }
 
     return "unknown";
@@ -149,6 +210,24 @@ TrexStatelessPort::get_properties(string &driver, string &speed) {
     speed  = "1 Gbps";
 }
 
+bool
+TrexStatelessPort::verify_state(int state, bool should_throw) const {
+    if ( (state & m_port_state) == 0 ) {
+        if (should_throw) {
+            throw TrexRpcException("command cannot be executed on current state: '" + get_state_as_string() + "'");
+        } else {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+void
+TrexStatelessPort::change_state(port_state_e new_state) {
+
+    m_port_state = new_state;
+}
 
 /**
  * generate a random connection handler
diff --git a/src/stateless/cp/trex_stateless_port.h b/src/stateless/cp/trex_stateless_port.h
index 09183768..90bf936e 100644
--- a/src/stateless/cp/trex_stateless_port.h
+++ b/src/stateless/cp/trex_stateless_port.h
@@ -37,9 +37,11 @@ public:
      * port state
      */
     enum port_state_e {
-        PORT_STATE_DOWN,
-        PORT_STATE_UP_IDLE,
-        PORT_STATE_TRANSMITTING
+        PORT_STATE_DOWN = 0x1,
+        PORT_STATE_IDLE = 0x2,
+        PORT_STATE_STREAMS = 0x4,
+        PORT_STATE_TX = 0x8,
+        PORT_STATE_PAUSE = 0x10,
     };
 
     /**
@@ -53,30 +55,54 @@ public:
     };
 
     TrexStatelessPort(uint8_t port_id);
+    
+    /**
+     * acquire port
+     * throws TrexException in case of an error
+     */
+    void acquire(const std::string &user, bool force = false);
+
+    /**
+     * release the port from the current user
+     * throws TrexException in case of an error
+     */
+    void release(void);
 
     /**
      * start traffic
-     * 
+     * throws TrexException in case of an error
      */
-    rc_e start_traffic(double mul);
+    void start_traffic(double mul);
 
     /**
      * stop traffic
-     * 
+     * throws TrexException in case of an error
+     */
+    void stop_traffic(void);
+
+    /**
+     * pause traffic
+     * throws TrexException in case of an error
      */
-    rc_e stop_traffic(void);
+    void pause_traffic(void);
 
     /**
-     * access the stream table
+     * resume traffic
+     * throws TrexException in case of an error
+     */
+    void resume_traffic(void);
+
+    /**
+     * update current traffic on port
      * 
      */
-    TrexStreamTable *get_stream_table();
+    void update_traffic(double mul);
 
     /**
      * get the port state
      * 
      */
-    port_state_e get_state() {
+    port_state_e get_state() const {
         return m_port_state;
     }
 
@@ -84,7 +110,7 @@ public:
      * port state as string
      * 
      */
-    std::string get_state_as_string();
+    std::string get_state_as_string() const;
 
     /**
      * fill up properties of the port
@@ -96,6 +122,7 @@ public:
      */
     void get_properties(std::string &driver, std::string &speed);
 
+
     /**
     * query for ownership
     * 
@@ -113,11 +140,70 @@ public:
         return m_owner_handler;
     }
 
-    bool is_free_to_aquire() {
-        return (m_owner == "none");
+
+    bool verify_owner_handler(const std::string &handler) {
+
+        return ( (m_owner != "none") && (m_owner_handler == handler) );
+
     }
 
     /**
+     * encode stats as JSON
+     */
+    void encode_stats(Json::Value &port);
+
+    uint8_t get_port_id() {
+        return m_port_id;
+    }
+
+    /**
+     * delegators
+     * 
+     */
+
+    void add_stream(TrexStream *stream) {
+        verify_state(PORT_STATE_IDLE | PORT_STATE_STREAMS);
+
+        m_stream_table.add_stream(stream);
+
+        change_state(PORT_STATE_STREAMS);
+    }
+
+    void remove_stream(TrexStream *stream) {
+        verify_state(PORT_STATE_STREAMS);
+
+        m_stream_table.remove_stream(stream);
+
+        if (m_stream_table.size() == 0) {
+            change_state(PORT_STATE_IDLE);
+        }
+    }
+
+    void remove_and_delete_all_streams() {
+        verify_state(PORT_STATE_IDLE | PORT_STATE_STREAMS);
+
+        m_stream_table.remove_and_delete_all_streams();
+
+        change_state(PORT_STATE_IDLE);
+    }
+
+    TrexStream * get_stream_by_id(uint32_t stream_id) {
+        return m_stream_table.get_stream_by_id(stream_id);
+    }
+
+    void get_id_list(std::vector<uint32_t> &id_list) {
+        m_stream_table.get_id_list(id_list);
+    }
+
+    void get_object_list(std::vector<TrexStream *> &object_list) {
+        m_stream_table.get_object_list(object_list);
+    }
+
+private:
+
+  
+
+    /**
     * take ownership of the server array 
     * this is static 
     * ownership is total 
@@ -133,22 +219,14 @@ public:
         m_owner_handler = "";
     }
 
-    bool verify_owner_handler(const std::string &handler) {
-
-        return ( (m_owner != "none") && (m_owner_handler == handler) );
-
+    bool is_free_to_aquire() {
+        return (m_owner == "none");
     }
 
-    /**
-     * encode stats as JSON
-     */
-    void encode_stats(Json::Value &port);
 
-    uint8_t get_port_id() {
-        return m_port_id;
-    }
+    bool verify_state(int state, bool should_throw = true) const;
 
-private:
+    void change_state(port_state_e new_state);
 
     std::string generate_handler();